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  • Fabrication and anti-corrosion properties of melamine-treated graphene oxide adsorbed on copper
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-27
    Yue Li; Hui Yang; Fengqi Wang; Yong Huang
    更新日期:2020-01-27
  • Unveiling the origin of the anti-fogging performance of plasma-coated glass: Role of the structure and the chemistry of siloxane precursors
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-25
    Iván Rodríguez Durán; Jacopo Profili; Luc Stafford; Gaétan Laroche

    The application of (super)hydrophilic coatings in sectors of activity concerned by fogging, such as the food industry, the architectural sector, and medicine has attracted enormous attention over the past few years. However, despite this interest, most of the coating deposition techniques used thus far are not suitable for large-scale production because of their multistep nature. In this regard, the use of atmospheric pressure dielectric barrier discharges (AP-DBD) operated under a controlled N2/N2O atmosphere offers a promising alternative to conventional deposition techniques for the fabrication of anti-fogging coatings. Using this one-step coating approach, four siloxane precursors with different structures and different number of Si―H and Si−CH3 groups; namely, 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS), octamethylcyclotetrasiloxane (OMCTS), 1,1,3,3-tetramethyldisiloxane (TMDSO), and hexamethyldisiloxane (HMDSO) were deposited on glass samples. Because of their extreme wetting behavior (WCA < 5°), TMCTS-coated glasses featured an excellent anti-fogging performance, in contrast to OMCTS-, TMDSO-, and HMDSO-coated glasses which were not fogging-resistant (WCA ≈ 80°)). Coupled with hydrophilic functionalities, such as CO, O CO, and SiOH groups, the relatively high surface roughness of TMCTS-coated glass, compared with that of OMCTS-, TMDSO-, or HMDSO-coated glass, accounted for its superior visual characteristics when exposed to water vapor at 80 °C. These results allow us to confidently conclude that the cyclic structure of TMCTS in conjunction with the high reactivity of the Si-H bonds is responsible for the observed anti-fogging effect.

    更新日期:2020-01-26
  • Formation of polymer-like anticorrosive films based on organosilanes with benzotriazole, carboxylic and phosphonic acids. Protection of copper and steel against atmospheric corrosion
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-24
    Natalia Gladkikh; Yuriy Makarychev; Alexander Chirkunov; Alexey Shapagin; Maxim Petrunin; Ludmila Maksaeva; Marina Maleeva; Tatyana Yurasova; Andrey Marshakov

    A technique has been developed to create polymer-like protective layers on metal surfaces from aqueous solutions of organosilanols with benzotriazole, carboxylic or phosphonic acids. Using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), it was shown that the introduction of hydroxyethylidene diphosphonic or citric acids into the inhibitor formulations leads to the formation of a multilayer polymer-like film on the metal surface. Electrochemical and corrosion tests (a technique of the polarization resistance and exposure of samples in the salt spray chamber) demonstrated the effectiveness of the formed multilayer films on metals to protect steel and copper against atmospheric corrosion.

    更新日期:2020-01-24
  • A new hybrid waterborne polyurethane coating synthesized from natural rubber and rubber seed oil with grafted acrylate
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-23
    Nathapong Sukhawipat; Wanida Raksanak; Ekwipoo Kalkornsurapranee; Anuwat Saetung; Nitinart Saetung
    更新日期:2020-01-23
  • 更新日期:2020-01-23
  • Preparation of copper-cobalt-nickel ferrite/graphene oxide/polyaniline composite and its applications in microwave absorption coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Jie Sun; Liming Wang; Qun Yang; Yong Shen; Xiao Zhang

    A copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was prepared by a two-step method. The prepared tri-composite was used as the absorbing agent and waterborne-polyurethane as matrix which coated on cotton fabric to prepare a flexible absorbing material. The absorbing property and electromagnetic shielding performance of the coated fabrics were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), anti-electromagnetic radiation and vector network analyzer. Compared with polyaniline and graphene oxide, the microwave absorption capacity of the copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was significantly enhanced, which can achieve to -33 dB at 10.8 GHz. When the content of coating agent was 40 % and thickness of the coated fabric was 2.0 mm, the shielding performance could reach -47 dB in the frequency of 300 kHz to 3.0 GHz. Meanwhile, the mechanical property was better than that of uncoated cotton fabric.

    更新日期:2020-01-23
  • 更新日期:2020-01-23
  • The influence of hydrofluoric acid doped polyaniline on the protective performance of a mg-rich epoxy coating on AZ91D magnesium alloy
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Xingguo Feng; Chao Zhu; Xiangyu Lu; Zhang Yiji; Tong Wu; Yu Zuo; Xuhui Zhao; Yuchao Dun; Mai Wang

    Hydrofluoric acid doped PANI (PANI-HF) particles were added to a magnesium (Mg)-rich primer (MRP) on AZ91D Mg alloy and the influence of the particles on the primer was investigated. The optimal PANI-HF particle content was 1 wt.%. These particles improved the electrical contact between Mg particles and the AZ91D substrate, thereby enhancing the cathodic protection. Subsequently, the products of Mg particles (MgO and MgF2) precipitated in the coating and improved the barrier effects. Moreover, PANI captured some chloride ions, thereby reducing degradation of the coating. Eventually, the protective film formed on the AZ91D substrate blocked the electrolyte permeation, retarding the corrosion of the substrate.

    更新日期:2020-01-22
  • Chemical modification of graphene oxide to reinforce the corrosion protection performance of UV-curable polyurethane acrylate coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Yanjun Ma; Yinping Ye; Hongqi Wan; Lei Chen; Huidi Zhou; Jianmin Chen
    更新日期:2020-01-22
  • Oil-repellent and antifog coatings based on poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Shuai Luo; Xiao-Xi Peng; Yun-Fei Zhang; Ping Fu; Fei-Peng Du

    In order to improve the oil-repellent and antifouling ability of the antifog coatings, a poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant (PVA/H-PSMA/FC) was prepared by incorporating a fluorocarbon surfactant into PVA/H-PSMA via hydrogen bonds. The microstructure, antifog and oil-repellent properties were investigated in our study, and the results indicate that the strong interaction between the PVA/H-PSMA and the FC provides a good fixation for the FC inside or on the surface of the coatings. The water contact angle (WCA) ranges from 59° to 69° and the oil contact angle (OCA) ranges from 35° to 50°, which means that the PVA/H-PSMA/FC coatings are hydrophilic and oleophilic. The results also demonstrate that the prepared PVA/H-PSMA/FC coating exhibits excellent antifog properties and high transparency. Moreover, the oil droplets may slip off the coating surface without any residue and the glide angle is below 12°. A low content of FC loaded creates a large space between FC molecules, thus providing enough hydrophilicity on the PVA/H-PSMA surface and achieving excellent antifog performance. Meanwhile, the mobile fluorinated alkyl chains on the surface can be reorganized and act as “slides” to easily move oil droplets at low TA, providing oil repellency. The excellent oil-repellency makes the transparent PVA/H-PSMA/FC antifog coatings have potential application prospects in the field of surface protection of optical equipment and solar panel.

    更新日期:2020-01-22
  • Preparation and UV aging of nano-SiO2/fluorinated polyacrylate polyurethane hydrophobic composite coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Fuying Yu; Ju Gao; Canpei Liu; Yaokun Chen; Gang Zhong; Chris Hodges; Mingfeng Chen; Huagui Zhang
    更新日期:2020-01-22
  • Self-healing of chemically bonded hybrid silica/epoxy for steel coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Ayman M. Atta; Abdelrahman O. Ezzat; Ashraf M. El-Saeed; Ahmad M. Tawfeek; Nourah I. Sabeela

    New amino-functionalized smart silica composites and nanoparticles were prepared from hydrolyzing microgel based on N-isopropylacrylamide-co-vinyltrimethoxysilane (NIPAM-VTS) with tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTS). The chemical structure, morphology, particle sizes, and thermal stability were evaluated and proved that the amino group contents were increased on the surfaces of silica composites more than that modified after calcination at 700 °C. The amino-functionalized calcined silica nanoparticles and NIPAM-VTS-polysiloxane were found to show better dispersion capability than silica NPs particles existed in the epoxy hybrid coatings. The amino-functionalized hybrid silica epoxy coatings were found to be much superior in the adhesion, mechanical testing and corrosion protection over those of hybrid materials without amino-functionalization. The amino-functionalized NIPAM-VTS-polysiloxane shows new self-healing performance when blended with epoxy matrix at weight content equals or above 6 Wt. % after exposure to salt spray humidity of seawater. The self-healing performance may have probably resulted from the salt sensitivity of amino-functionalized NIPAM-VTS-polysiloxane composite and enhancement of the adhesion strength due to the formation of Fe O Si and Fe NH Si covalent bonds at the interface of epoxy coating.

    更新日期:2020-01-22
  • Synthesis and photopolymerization of novel UV-curable macro-photoinitiators
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-21
    Lin Deng; Liuyan Tang; Jinqing Qu

    The design and development of macro-photoinitiators applicable to UV system has been attracted increasing attention for their excellent performance of low migration and high compatibility. Herein, four kinds of novel macro-photoinitiators (PI1-PI4) used in UV-curable coatings were synthesized by different isocyanates, 1-hydroxycyclohexyl phenyl ketone (Irgacure 184), 2-hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PETA). The structures were analyzed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Moreover, the photopolymerization kinetics of the macro-photoinitiators were investigated by real-time FTIR. Results revealed that the macro-photoinitiators display higher curing efficiency, lower migration performance and better compatibility with formulation compositions compared to Irgacure 184. On the other hand, the macro-photoinitiators also served as self-initiating oligomers and had good thermal stability with 10 % weight loss temperatures (T10 %) above 299.7 °C. The UV-cured films consisting of oligomers and tripropylene glycol diacrylate (TPGDA) showed excellent physical properties and high curing efficiency and rapid curing rate.

    更新日期:2020-01-22
  • Polyurethane modified epoxy acrylate resins containing ε-caprolactone unit
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-16
    Yang Xu; Jing Luo; Xiaoya Liu; Ren Liu

    Epoxy acrylate resins modified by polyurethane with excellent mechanical properties play a crucial role in UV-curable coatings, but the high viscosity limits their further applications in 3D printing, electronic packaging material. In this work, a series of polyurethane modified epoxy acrylate resins containing various ε-caprolactone unit content were successfully synthesized to reduce the viscosity of polyurethane modified epoxy acrylate resins. The chemical structure and molecular weight of the prepared resins were characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR) and gel permeation chromatography (GPC), respectively. The influences of ε-caprolactone unit on the viscosity of resins and double bond conversion of cured films were studied. The dynamic thermomechanical properties, mechanical properties, thermal stability and basic properties of UV curable coatings were also evaluated. The results show that the viscosity of resins is reduced by two orders of magnitude. As the ε-caprolactone unit content increased, the adhesive force increased from 0B to 5B according to ASTM D3359, while the glass transition temperatures (Tg) of films and pencil hardness were slightly lower than those of the conventional polyurethane modified epoxy acrylate resins. In summary the introduction of ε-caprolactone unit in the side chain enables the preparation of polyurethane modified epoxy acrylate resin with ultralow viscosity as well as a more comprehensive adhesive and impact force performance.

    更新日期:2020-01-17
  • Anticorrosion behavior of DBSA doped polyaniline nanoparticles/epoxy ester coating on carbon steel in saline-alkaline solution
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-17
    Mohsen Rayati; Reza Arefinia

    Anticorrosion coatings based on epoxy ester containing different concentrations of dodecyl benzene sulfonic acid doped polyaniline nanoparticles (nPAni(DBSA)) were prepared and applied on the carbon steel surface. The corrosion behavior of this system in saline-alkaline solution (3.5% NaCl and pH 9) was studied using electrochemical impedance spectroscopy (EIS) during 100 days immersion. At the end of immersion, the metal/coating interface was analyzed using scanning electron microscopy (SEM) and Raman spectroscopy. The obtained results showed that nPAni(DBSA) particles could efficiently improve the anticorrosion performance of the epoxy ester coating through both the barrier and the active mechanisms where the best corrosion inhibition of carbon steel was attained at 1.5% of nPAni(DBSA). The active inhibition of nPAni(DBSA) is attributed to the formation of a secondary passive layer at the metal/coating interface.

    更新日期:2020-01-17
  • Assessment of protection treatments for carbonatic stone using nanocomposite coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-13
    Vincenzo Renda; Monica Alvarez De Buergo; Maria Luisa Saladino; Eugenio Caponetti

    In this paper the effect of the application of four kinds of polymer dispersions containing nanoparticles, used as protectives, on two type of carbonatic lithotypes, White Noto and Comiso stone, is reported. The study was conducted by analysing the contribution of each component of the system. After the structural characterization of the coating itself, the performance of those colloidal systems has been studied upon application on the calcarenites, preferring non-invasive techniques and microdestructive techniques. Effect of the nanoparticles presence on hydrorepellency and roughness of the stone surface and on chromatic changes has also been considered. The tests conducted have proven that although some of the formulations present some issues for their usage on White Noto stone, all four formulations induce an effective waterproofing action on Comiso stones, even in presence of TiO2 and SiO2 nanoparticles.

    更新日期:2020-01-14
  • Effect of polyether/polyester polyol ratio on properties of waterborne two-component polyurethane coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-09
    Shiyu Li; Zhiyong Liu; Lijie Hou; Yang Chen; Tonghui Xu

    In order to obtain waterborne two-component polyurethane (WB 2K-PUR) with good mechanical properties as well as excellent corrosion resistance, a series of hydroxyl-based polyurethane (HO-WPU) were synthesized using isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and different proportions of polyether polyol (PTMEG) and polyester polyol (P1012) in this paper. Then WB 2K-PUR coatings were prepared with water-dispersible isocyanates (WDPI) as curing agent. The influence of the proportion of polyester polyols and polyether polyols in soft segments on coatings properties was studied. The characteristics of the coatings were analyzed by Fourier transform infrared spectroscopy (ATR-IR), contact angle, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and atomic force microscopy (AFM). The results showed that the mechanical properties and corrosion resistance of polyester and polyether polyols with appropriate proportion are improved significantly. The mechanism tended to be that with the addition of polyester, more hydrogen bonds were formed between the molecules, which increased the compactness of the coating as a physical crosslinking point. However, the ester groups have a strong affinity to water molecules, so the hydrophilicity of the coating was increased by excessive polyester polyols, and the shielding effect on the corrosion medium was reduced. With the inclusion of 40 % (g/g) P1012 in polyols, the coating has satisfied comprehensive properties.

    更新日期:2020-01-10
  • Phenolic fatty acid-based epoxy curing agent for antimicrobial epoxy polymers
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-09
    Kun Huang; Richard Ashby; Xuetong Fan; Robert A. Moreau; Gary D. Strahan; Alberto Nuñez; Helen Ngo

    Epoxy resins are one class of important reactive pre-polymers used in the coating industry. To manufacture epoxy resins with antimicrobial properties, active quaternary ammonium groups are often introduced into the polymeric backbones following resin polymerization reactions for structure modification. However, these complicated approaches associated with these types of reactions make the commercialization of the antimicrobial epoxy polymers uneconomical, impractical and inconvenient. Besides, quaternary ammonium groups are undesirable because the hydrophilicity of the groups makes the resins less water-resistant. In order to simplify the development of antimicrobial epoxy polymers, we prepared an amide by reacting novel bio-based phenolic-branched fatty acids with ethylenediamine. The resulting amide was cured into a commercial epoxy resin -- diglycidyl ether of bisphenol A (DGEBA), which was solution-cast into epoxy polymer films. The antimicrobial activities of the resulting epoxy polymer films were investigated. The crude phenolic branched fatty acid amides (PBC-FAAs) as curing agents were separated and characterized by thin-layer chromatography, proton nuclear magnetic resonance (1H-NMR), gas chromatography-mass spectrometry (GCMS), liquid chromatography-mass spectrometry (LC/MS) and Fourier-transform infrared spectroscopy (FT-IR). The thermal and mechanical properties of the polymer films were also investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). Cured epoxy films prepared from purified PBC-FAA exhibited antimicrobial activity against Listeria innocua. However, the crude, unpurified PBC-FAA-cured epoxy film showed much more promising antimicrobial activity against both Listeria innocua (Gram positive) and Escherichia coli (Gram negative).

    更新日期:2020-01-10
  • Embedded polyhedral SiO2/castor oil-based WPU shell-core hybrid coating via self-assembly sol-gel process
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Linlong Meng; Haoxin Zhu; Bing Feng; Zhenhua Gao; Di Wang; Shuangying Wei
    更新日期:2020-01-09
  • Microwave absorption coating based on assemblies of magnetic nanoparticles for enhancing absorption bandwidth and durability
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Yibing Ma; YaYa Zhou; Chunhong Qi; Youyi Sun; Yinghe Zhang; Yaqing Liu

    A new class microwave absorption coating based on assemblies of core-shell magnetic nanoparticles was facile preparation to improve absorption bandwidth and durability. The microwave absorption coating with a thickness of ca.1.5mm exhibited a wide bandwidth (ca.9.2GHz). Furthermore, the durability of microwave absorption coating was further evaluated. It showed good water-shedding ability and mechanical stability. The excellent performance was mainly attributed to special surface rough structure and low surface energy of coating, resulting from assemblies of core-shell magnetic nanoparticles. These provide a new idea to design and preparation of microwave absorption coating with high performance for application in stealth technology.

    更新日期:2020-01-09
  • Waterborne acrylic-styrene/PDMS coatings formulated by different particle sizes of PDMS emulsions for outdoor applications
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Jaber Khanjani; Ahad Hanifpour; Shahla Pazokifard; Mohammad J. Zohuriaan-Mehr

    This research focuses on the characteristics of water-based pigmented coatings prepared by PDMS latexes in different sizes blended with acrylic-styrene (ASC) latexes. PDMS latexes were synthesized through macro-emulsion and micro-emulsion polymerization of octamethylcyclotetrasiloxane in two different average particle sizes (i.e., 88 nm and 19 nm named mac.PDMS and mic.PDMS, respectively) and then individually blended by ASC latex in an optimum weight ratio. Compatibility and viscoelastic properties of the blends were evaluated through dynamic mechanical thermal analysis (DMTA). A single DMTA peak confirmed the compatibility between the ASC and PDMS polymers. The performance of the blends in pigmented coatings was first evaluated through measuring loading disperseability index (LDI) of the latex blends, then via measuring wet scrub resistance, dirt pick-up resistance, weathering resistance and washability in the pigmented coatings prepared from the latex blends. The LDI values of 9.5 and 10.8 were obtained for mac.PDMSand mic.PDMS/ASC blends, respectively. Test results on pigmented coatings showed both mac.PDMS and mic.PDMS led to improve outdoor performance of water-based acrylic coatings. However, mic.PDMS latex improves further weather and dirt pick-up resistances (using CIE color measurements) and washability in the coatings. Consequently, smaller particle sizes of PDMS latexes lead to enhance the performance of outdoor acrylic coatings as the waterborne and environmentally friendly materials.

    更新日期:2020-01-09
  • Relation between the corrosion resistance and the chemical structure of hybrid sol-gel coatings with interlinked inorganic-organic network
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-07
    F.X. Perrin; F. Ziarelli; A. Dupuis

    Organic-inorganic hybrid coatings have been prepared by a sol-gel route from 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) with triethylenetetramine (TETA) added in the sol formulation. The main goal of this research was to evaluate how the chemical structure of the GPTMS/TEOS/TETA hybrid coatings influences the corrosion of mild steel. The presence of TETA as an epoxy opening agent offers the possibility to form interconnected epoxy-amine and silica networks. It was found by means of 29Si HRMAS NMR spectroscopy that TETA acted as an efficient basic catalyst for the condensation of GPTMS and TEOS. This accelerates the gelation and gives limited shelf life to GPTMS/TEOS/TETA sols. Structural characterization of the cured hybrid coatings was performed using 13C and 29Si Solid State NMR spectroscopies. The results show that the epoxy amine reaction is the principal epoxide ring opening reaction. The slow formation of diol units with sols prepared with an excess of epoxy groups has also been observed. It was found that the polymerization of the organic network hindered the polymerization of the siloxane network. As a result, the film based on an epoxy rich off-stoichiometric formulation had a higher Persoz hardness value compared to the stoichiometric film. The corrosion behavior of the coatings in neutral chloride solution was studied through electrochemical impedance spectroscopy (EIS). The results revealed that barrier properties have been improved by the addition of TETA to sol-gel films. The films based on epoxy rich off-stoichiometric formulation and those base on stoichiometric formulation resulted in similar barrier properties but a higher resistance to interfacial delamination was observed for the epoxy rich off-stoichiometric films. The relationship between the film structure and its corrosion behavior was discussed.

    更新日期:2020-01-08
  • An eco-friendly and effective flame retardant coating for cotton fabric based on phytic acid doped silica sol approach
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-07
    Xian-Wei Cheng; Ren-Cheng Tang; Jin-Ping Guan; Shao-Qiang Zhou
    更新日期:2020-01-08
  • Improving nanoparticle dispersion and polymer crystallinity in polyvinylidene fluoride/POSS coatings using tetrahydrofuran as co-solvent
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-06
    Mehrdad Khodaie; Ardeshir Saeidi; Hossein Ali Khonakdar; Javad Seyfi; Iman Hejazi; Seyed Mohammad Davachi; Hooman Bahmanpour
    更新日期:2020-01-07
  • Effects of graphene on the corrosion evolution of zinc particles in waterborne epoxy zinc-containing coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-06
    Shiyu Huang; Gang Kong; Bo Yang; Shuanghong Zhang; Chunshan Che

    In this paper, graphene/ waterborne epoxy zinc-containing coatings with different graphene contents were prepared. The corrosion resistance properties of the graphene/ waterborne epoxy zinc-containing coatings were investigated by electrochemical impedance spectroscopy (EIS), immersion test and neutral salt spray test. The results showed that addition of 0.6 wt% graphene into the coating could remarkably improve its cathodic protection performance and barrier performance comparing with the coating without graphene. In addition, the effects of graphene on the corrosion evolution of zinc particles in the coating were observed by the field-emission scanning electron microscopy (FE-SEM) coupled with energy dispersive spectroscopy (EDS). The results showed that the zinc particles near the interface between steel substrate and the coating corroded firstly after the corrosive media diffused in the coating and reached the interface due to the cathodic protection to the steel, and then zinc particles continued to be corroded from the interface to upper part of the coating since they could provide the cathodic protection to the substrate thanks to the electrical connection of graphene. Meanwhile, X-ray diffraction (XRD) patterns confirmed the corrosion products of the zinc particles were mainly consisted of Zn5(OH)8Cl2·H2O.

    更新日期:2020-01-06
  • Preparation and evaluation of fouling-release properties of amphiphilic perfluoropolyether-zwitterion cross-linked polymer films
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-05
    Antonio J. Ruiz-Sanchez; Andrew J. Guerin; Osama El-Zubir; Gema Dura; Claudia Ventura; Luke I. Dixon; Andrew Houlton; Benjamin R. Horrocks; Nicholas S. Jakubovics; Pier-Antonio Guarda; Giovanni Simeone; Anthony S. Clare; David A. Fulton

    The biofouling of marine structures presents a problem for maritime industries, including increasing fuel and operational costs. There has been much work developing and evaluating chemically ‘ambiguous’ amphiphilic coatings based upon hydrophobic fluoropolymer and hydrophilic poly(ethylene glycol) (PEG). Many of these coatings have shown good fouling-release performance against diatoms, which present a fouling challenge to commercially-available state-of-the-art silicone-based fouling-release coatings. However, PEG is prone to oxidation, which limits its practical use in the marine environment, and thus an alternative hydrophilic material would be desirable in the future development of amphiphilic coatings. In this regard, zwitterionic materials are emerging as a promising class of hydrophilic antifouling material, which we hypothesized would be a suitable alternative to PEG within amphiphilic coatings. To test this hypothesis, cross-linked amphiphilic films consisting of commercially available perfluoropolyethers and the zwitterionic monomer sulfobetaine methacrylate were developed and studied. The difficulty in formulating these chemically incompatible species was overcome by careful choice of solvents and a series of prototype cross-linked films were prepared in which increasing quantities of zwitterion were systematically incorporated. The fouling-release performance of these films was tested against the diatom Navicula incerta, a common microfouling organism responsible for the formation of so-called ‘slime’ layers, and antifouling performance with cypris larvae of two barnacle species, Balanus amphitrite, and Balanus improvisus. To expand the scope of the study, the clinically-relevant biofilm-forming pathogen Staphylococcus aureus, which is a major culprit in the infection and failure of millions of indwelling medical devices, was also evaluated. Results indicate that the incorporation of zwitterion into perfluoropolyethers leads to significant improvements in fouling-release performance and these amphiphilic coatings display potential in fouling-release applications.

    更新日期:2020-01-06
  • Evaluation of thermally hydrolyzed specified risk materials cross-linked with glutaraldehyde for tackifier applications
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-05
    Tao Shui; Birendra B. Adhikari; Michael Chae; David C. Bressler

    Specified risk materials (SRMs) are the tissues in cattle where misfolded proteins that cause "mad cow disease" are likely to concentrate, and thus they must be segregated from normal consumption. In this study, peptides derived from SRM hydrolysates were characterized and applied in the development of tackifiers. As one of the key components of a hydro-mulch mixture, tackifiers are employed to bind wood fibres and seeds of plants to the soil in order to facilitate improved rooting. However, sufficient hydrophobicity is also required by tackifiers to prevent diffusion and loss of function when exposed to high levels of moisture. Thus, glutaraldehyde cross-linking was examined to moderate hydrophobicity of SRM-derived peptides. Moreover, other characteristics of the peptides and cross-linked products were assessed and compared with commercial tackifiers. This demonstrated the competitiveness and potential of our SRM bioconversion strategy to produce tackifiers.

    更新日期:2020-01-06
  • Nonisothermal cure kinetics of epoxy/MnxFe3-xO4 nanocomposites
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-02
    Maryam Jouyandeh; Seyed Mohammad Reza Paran; Seyed Soroush Mousavi Khadem; Mohammad Reza Ganjali; Vahideh Akbari; Henri Vahabi; Mohammad Reza Saeb

    Nonisothermal cure kinetic of epoxy containing bare and Mn doped Fe3O4 nanoparticles was studied through differential scanning calorimetry (DSC). The evolution of the apparent activation energy (Eα) as a function of the extent of curing reaction was evaluated by using model-free integral Kissinger and differential Friedman isoconversional methods. Mn2+ cations in the MnxFe3-xO4 were the reason for facilitated epoxy curing reaction, as proved by a lower values of Eα obtained for the corresponding nanocomposite. Moreover, MnxFe3-xO4 nanoparticles increased the average autocatalytic reaction order from 0.48 for neat epoxy to 0.52 for epoxy/Mn-Fe3O4 nanocomposite due to the participation of hydroxyl groups on the surface of nanoparticle in epoxide ring opening. Addition of Fe3O4 and Mn-Fe3O4 nanoparticles decreased collisions between the curing moieties, as reflected in a drop in the frequency factor from ca. 18.9 for neat epoxy to 13.4 and 14.9 for epoxy nanocomposites containing 0.1 wt.% of Fe3O4 and Mn-Fe3O4, respectively.

    更新日期:2020-01-04
  • Evaluation of new core-shell pigments on the anticorrosive performance of coated reinforced concrete steel
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-03
    N.M. Ahmed; A.M. Fathi; M.G. Mohamed; W.M. Abd El-Gawad
    更新日期:2020-01-04
  • A comprehensive review on recent advances in superhydrophobic surfaces and their applications for drag reduction
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-03
    Mohammad Liravi; Hossein Pakzad; Ali Moosavi; Ali Nouri-Borujerdi

    Nowadays, superhydrophobic surfaces have attracted a lot of interest because of the wide range of applications in industries. These surfaces can significantly reduce the drag force due to the formation of air gaps between the substrate and liquid interface. The present review mainly focuses on the very recent progresses in the drag reduction studies using superhydrophobic surfaces. Also, a brief discussion about the mathematical modeling and the theories of superhydrophobic surfaces, natural water repellent surfaces, various fabrication techniques with advantages and disadvantages of each method and different properties of the fabricated surfaces in industrial applications is presented. Finally, the limitations of using such surfaces in industrial applications, which deals with harsh and destructive environment conditions, are addressed and further research topics and future outlooks to improve the durability of the superhydrophobic surfaces are discussed.

    更新日期:2020-01-04
  • Ni-Fe-MoO42- LDHs/epoxy resin varnish: A composite coating on carbon steel for long-time and active corrosion protection
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-03
    Guangchun Peng; Qianqian Qiao; Kang Huang; Junsheng Wu; Yi Wang; Xiaoqian Fu; Zhan Zhang; Tao Fang; Bowei Zhang; Yizhong Huang; Xiaogang Li
    更新日期:2020-01-04
  • Synthesis of phytic acid-based monomer for UV-Cured coating to improve fire safety of PMMA
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-03
    Congxue Yao; Weiyi Xing; Chao Ma; Lei Song; Yuan Hu; Zeyuan Zhuang

    In this work, a novel phosphorous containing UV-curable monomer (PA) was synthesized by the reaction of phytic acid and glycidyl methacrylate. The structure of PA was confirmed by 13C NMR, 1H NMR, 31P NMR and FTIR. Pyrolysis gas phase products of PA cured coating mainly include CO, CO2, H2O, alkyl-containing compounds, carbonyl-containing compounds and aromatic compounds. Cooperated with other two kind of reactive monomers, TAEP and TGICA, PA showed excellent fire protection effect for PMMA matrix, extending fireproof time of PMMA for more than twenty minutes. The SEM results of the carbon residues show that a certain coating prepared can form a uniform and complete expanded carbon layer, resulting in protecting the PMMA matrix from being ignited.

    更新日期:2020-01-04
  • Synthesis of (Ba4Zn2-xMnxFe36O60) U-type hexaferrite pigments and studying their influence on the protective performance, mechanical behavior and microwave absorption properties of polyurethane paint coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-11-21
    Erfan Asadinia; Mahmoud Pakshir; S. Esmail Hosseini

    A series of U-type hexaferrite ceramic powders Ba4Zn2-xMnxFe36O60 (x= 0.5, 1, and 1.5) were synthesized through the solid-state reaction (SSR) method and used as electromagnetic (EM) waves absorbing inorganic pigments to fabricate radar absorbing paint (RAP) coatings containing polyurethane matrix and talc as a filler. The colour properties and chemical stability of powder pigments were determined. Also, the crystalline structure and morphology of the synthesized pigments were characterized by X-ray diff ;raction (XRD) and scanning electron microscope (SEM) analysis. The effect of addition of these pigments to the polyurethane (PU) matrix on mechanical properties, corrosion performances and microwave absorption performances was investigated. The EM parameters and microwave absorbing properties of the RAP coatings applied on the aluminum substrate were measured in the X-band (8.2–12.4 GHz) frequency range by using vector network analyzer (VNA) and the scattering parameters method. The results showed that the mechanical properties such as microhardness, wear resistance and roughness were increased due to the addition of Mn content in the Zn–U type pigment. Also, the impact resistance was seen to increase with addition of Zn (decreasing x). The corrosion performance and adhesion strength of the coatings were examined using the salt spray and tape adhesion test, which exhibited that both of them were higher than non-pigmented polyurethane (NPPU) matrix coatings. The pigment composition with x = 1 led to an optimum microwave absorption of 97.55 % (or reflection loss RL= −16.10 dB) at 9.82 GHz and 1.5 mm thickness. In addition, this composition coating displays a broad frequency bandwidth (∼4.03 GHz) for RL≤-10 dB (90 % MW absorption), in 8.2–12.4 GHz. This type of RAP coating, due to its small required thickness, light weight, wide band absorption and cost-effectiveness can be used for suppressing EM interferences and stealth applications.

    更新日期:2020-01-01
  • 更新日期:2019-12-31
  • Preparation and properties of polyvinylpyrrolidone-cuprous oxide microcapsule antifouling coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-30
    Tianye Mao; Gang Lu; Chaoyang Xu; Hongwei Yu; Jialu Yu

    Traditional copper based antifouling coatings possess the defects of short validity period of antifouling and potential Cu2+ pollution in local seawater. This paper starts with antifouling agent and matrix resin to prevent these drawbacks. Polyvinylpyrrolidone-cuprous oxide (PVP-Cu2O) microcapsules are synthesized via sodium sulfite reduction-single condensation method firstly. The morphology, composition, particle size distribution and embedding rate of PVP-Cu2O are characterized. Then the graft resin of hydrophilic polyurethane/epoxy resin (PU/EP) is prepared via a two-step polymerization method using 2,4-toluene diisocyanate, polyethylene glycol mono methyl ether and epoxy resin as raw materials. Afterwards, the antifouling coating is prepared with PVP-Cu2O as antifouling agent and PU/EP as matrix resin. The dispersion, mechanical properties, release property and antifouling performance of the prepared coating are evaluated. Compared with cuprous oxide antifouling coatings, PVP-Cu2O antifouling coating can improve the dispersion of coating and reduce the release rate of antifouling agent to about 11.5 μg·cm−2·d-1. Moreover, the results of testing antifouling panels in shallow submergence suggest that PVP-Cu2O antifouling coating can achieve the prolongation of antifouling effect.

    更新日期:2019-12-31
  • Effect of molecular backbone structure on vapor phase coupling reaction between diiso(thio)cyanates with diamines, diols, and dithiols
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-30
    Shimeles Shumi Raya; Abu Saad Ansari; Sung Gu Kang; Han-Bo-Ram Lee; Bonggeun Shong
    更新日期:2019-12-30
  • Characterization and evaluation of primer formulations for bonding silicone rubber to metal
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-28
    A. Grard; L. Belec; F.X. Perrin

    The aim of this study was to explore the chemistry and adhesive properties of industrial primer formulations used for bonding silicone elastomers on AA6061 aluminum alloy. The composition of different primer formulations was determined using conventional chemical analyses. Adhesion strength was measured using 90° peel test. The formulation comprising partially condensed vinyltrimethoxysilane (VTMS) and tetrapropoxysilane (TPOS) and titanium tetrabutoxide (TTB) catalyst showed a strong adhesion to metal but a low adhesive strength of the primer-elastomer interface. 29Si NMR spectroscopy results have shown that exchange reactions of alkoxy groups of VTMS, TPOS and TTB has occurred in the formulation. Surprisingly, one formulation was free of silane and consisted of a one-component addition curing system comprising a SiH oligosiloxane, a vinyl-PDMS with a Pt catalyst and silica filler. This formulation enabled high cohesive strength of the primer and primer-elastomer interphase but it showed low adhesion to the metal. The more complex formulation containing a mixture of silanes (vinyltriethoxysilane, methyltriethoxysilane and tetraethoxysilane), a vinyl silicone gum, a hydroxy-terminated PDMS and silica filler resulted in the highest adhesive strength with 100 % cohesive failure in the elastomer. We found that the reinforcement effect of silica filler plays an important role in the promotion of adhesion.

    更新日期:2019-12-29
  • Development of fully organic coating system modified with epoxidized soybean oil with superior corrosion protection performance
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-27
    S. Ammar; A.W.M. Iling; K. Ramesh; S. Ramesh

    In this study, different loading ratios of epoxy resin (E) and epoxidized soybean oil (ESO) were introduced into acrylic–silicone polymeric blend with the presence of polyisocyanate (NCO) as the curing agent. The developed coating systems were applied on pretreated cold rolled mild steel substrates and the overall performances were investigated by means of Fourier transform infrared (FTIR) spectroscopy, contact angle measurements (CA), UV–vis analysis, thermogravimetric analysis (TGA), electrochemical impedance spectroscopy (EIS) and salt spray test. Moreover, the physico-mechanical properties of all developed coating systems were investigated. The obtained results revealed the ability of the combination of E and ESO at a certain concentration specifically, 9:1, to enhance the overall performance of the polymeric matrix as optimum curing level, better wettability, good physical-mechanical characteristics, thermal stability and significantly enhanced corrosion resistance were observed. The results also demonstrated the ability of the fabricated single-layer coating system to serve as a primer, topcoat or single coating system that has promising potential to be applied for decorative, self-cleaning, thermal insulation and corrosion protection purposes.

    更新日期:2019-12-27
  • Rational design of phosphorylated poly(vinyl alcohol) grafted polyaniline for waterborne bio-based alkyd nanocomposites with high performance
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-17
    Guiqiang Fei; Liyu Sun; Haihua Wang; Faryal Gohar; Yongning Ma; Yong-Mook Kang
    更新日期:2019-12-27
  • Interface regulation of graphene/carbon nanotube on the thermal conductivity and anticorrosion performance of their nanocomposite
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-21
    Qing Shi; Aiping Zhu

    Polymer matrix composite with inorganic fillers, can generate new properties and functionalities. In this paper, a silicone modified acrylic resin-based (Si-MA) nanocomposite that has a high thermal conductivity and a good corrosion protection was prepared. We found that the graphene nanosheets (GNS) and carbon nanotubes (CNT) can be uniformly dispersed into Si-MA after surface modification with N,N’-(cyclohexa-2,5-diene-1,4-diylidene)bis(2-hydroxy-N-(2-hydroxy-3-(4-(trihydroxysilyl)butoxy)propyl)-3-(4-(trihydroxysilyl)butoxy)propan-1-aminium) (TSiPD). The introduced the functional silanol hydroxyl groups result in good interfacial bonding between the nanofillers and Si-MA. The Si-MA nanocomposite with 9.9 wt% modified GNS and 0.1 wt% modified CNT shows a high thermal conductivity of 2.97 W/(m·K), which is caused by the formation of a honeycomb structure made of 2D GNS and 1D CNT, and the decrease of the interface heat resistance. Moreover, The Si-MA nanocomposite with 9.9 wt% modified GNS and 0.1 wt% modified CNT demonstrates good corrosion protection, which is caused by the good mechanical properties, hydrophobic performance and efficient barrier effect of the nanocomposite fillers. This nanocomposite coating has great potential application in the field of heat exchange corrosion protective coating for the heat exchangers.

    更新日期:2019-12-27
  • Automotive painting process: Minimizing energy consumption by using adjusted convective heat transfer coefficients
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-17
    Esley Silva Cavalcante; Luís Gonzaga Sales Vasconcelos; Gilvan Wanderley de Farias Neto; Wagner Brandão Ramos; Romildo Pereira Brito

    The process of drying/curing automobile painting is characterized as one of the main stages in automobile assembly. To guarantee the final painting quality, optimal operating conditions (mainly the temperature profile in the painting chamber) must be satisfied, and they are empirically defined in most cases. The availability of a mathematical model in transient regime enables the prediction of the drying/curing process behavior and consequences of possible operational changes on the final quality of the paint. However, obstacles continue to exist with respect to the implementation of the aforementioned types of models given the large number of parameters and complexity involved in their determination among which convection heat transfer coefficients are notable. Thus, the study presents a methodology to adjust the mathematical model of a paint-curing oven via determining convection heat transfer coefficients based on industrial data. The adjusted model was used to predict new operational scenarios for the most commonly used oven in automobile painting processes, namely the Elpo oven. The results indicate that the proposed methodology can be applied as a tool to develop operational optimization strategies that result in decreasing rework and energy costs without compromising painting quality.

    更新日期:2019-12-27
  • A novel approach of developing sustainable cellulose coating for self-cleaning-healing fabric
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-26
    Sunanda Roy; Lindong Zhai; Jung Woong Kim; Hyun Chan Kim; Jaehwan Kim

    Lately, self-cleaning fabrics have attracted immense attention for their greater functionality and unique self-cleaning ability against contaminations. Typically, a self-cleaning fabric possesses superhydrophobic surface. Unfortunately, till date majority of the superhydrophobic surfaces are created by utilizing fluorinated compounds or carbon/inorganic nanoparticles knowing their adverse effects on human health and environment. Therefore, this article presents a simple methodology for developing a novel sustainable superhydrophobic coating with the aim to produce self-cleaning and healing fabrics. The coating was developed using cellulose nanofibers (CNFs) as the raw material. When applied this coating on various fabrics (cotton and polyester), they became superhydrophobic with WCA of 152-156°(±3), thereby most liquid droplets rolled like round balls on the surfaces, leading to form self-cleaning fabrics. Moreover, the coated fabrics can quickly restore the self-healing property upon heating.

    更新日期:2019-12-27
  • Recent progress on parylene C polymer for biomedical applications: A review
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-17
    Monika Golda-Cepa; Klas Engvall; Minna Hakkarainen; Andrzej Kotarba
    更新日期:2019-12-27
  • Epoxy coating with in-situ synthesis of polypyrrole functionalized graphene oxide for enhanced anticorrosive performance
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-17
    Qingsong Zhu; En Li; Xianhu Liu; Weiqiang Song; Yilong Li; Xinchao Wang; Chuntai Liu
    更新日期:2019-12-27
  • Intumescent fire retardant coating with recycled powder from industrial effluent optimized using response surface methodology
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-17
    Shi Liu; Cheng Wang; Qinghua Hu; Siqi Huo; Qi Zhang; Zhitian Liu
    更新日期:2019-12-27
  • Optimization of adhesive performance of waterborne poly(urethane-urea)s for adhesion on high and low surface energy surfaces
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-26
    Iñigo Díez-García; Joseph L. Keddie; Arantxa Eceiza; Agnieszka Tercjak
    更新日期:2019-12-27
  • A biomimic superhydrophobic and anti-blood adhesion coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-19
    Qingyan Zeng; Caiyun Zheng; Kai Han; Wendong Wu; Hongfei Qi; Kun Wang; Pimpi Sahu; Rongxin Dong; Tingli Lu

    Bioinspired surfaces with special wettability have attracted considerable interest in both fundamental research and industry applications. This work described a biomimic superhydrophobic coating based on one new flower-like micro-nano particles via electrophoretic deposition (EPD) technique. Firstly, flower-like particles were fabricated by a facile one-step oxidation method. The particles were assembled with a large number of ordered crossed 10–20 nm thickness nano-sheets, and the particle diameter was about 2–3 μm, just like the microprotrusions of taro leaf. Furthermore, possible formation mechanism of the particles discussed. Then flower-like particles together with electropositive chitosan were deposited on substrates via EPD. After further modified with a low surface energy reagent, the coatings showed excellent superhydrophobicity (contact angle about 157°, sliding angle 2.1°). In addition, the superhydrophobic coating demonstrated mechanical durability, anti-bacteria adhesion and significantly anti-blood adhesion properties. The results indicated that the biomimic superhydrophobic coating might have the potential application in medical instruments for its significantly anti-blood adhesion property.

    更新日期:2019-12-27
  • Self-healing dual cured polyurethane elastomeric coatings prepared by orthogonal reactions
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-26
    Mansour Shahidzadeh; Zahra Khansari Varkaneh; Bahram Ramezanzadeh; Mona Zamani Pedram; Masoud Yarmohammadi
    更新日期:2019-12-27
  • Active corrosion performance of magnesium by silane coatings reinforced with polyaniline/praseodymium
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-18
    Amir Samadi Najibzad; Reza Amini; Mehran Rostami; Pooneh Kardar; Michele Fedel

    In recent years, many researches are conducted to find a good replacement for conversion coatings due to envirenmental issues. Silane-based coatings containing corrosion inhibitors can be good candidates. In this study, a composite containing praseodymium (Pr) and polyaniline (PANI) with different ratios was synthesized and prepared. SEM and FE-SEM images along with EDS and MAP were prepared to investigate the synthesis and confirmation of formation of PANI and Pr structure. Different concentrations of inhibitors were used and dispersed in the silane hybrid matrix and deposited it by dipping in an AZ31 magnesium alloy. The results of the identification and analysis indicate the formation of composite of these two organic-inorganic inhibitors and the replacement of praseodymium particles in the aniline structure. Subsequently, anti-corrosion properties of this composite in a 3.5 % solution were evaluated. Adding Pr-PANI to the silane coating resulted in an increase in contact angle. This increase in the contact angle of the sample with ratio of 2000 ppm was more than that in the sample with the ratio of 1000 ppm, indicating the presence of more OH groups in the coating. These results confirm the output of FT-IR and TGA data. In addition, the magnesium sample coated with silane was completely degraded after 24 h and the corrosion products are observed on the sample, but the coating of silane samples with Pr-PANI was less damaged after 24 h and also the sample with concentration of 2000 ppm of this inhibitor showed better performance than other concentrations.

    更新日期:2019-12-27
  • Effects of carbon materials on fire protection and smoke suppression of waterborne intumescent coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-20
    Wang Zhan; Le Chen; Fusheng Cui; Zhaozhan Gu; Juncheng Jiang

    The new carbon materials bring significant progress in fire resistance coating and technology, especially carbon nano materials. Aiming to improve the fire resistance, expanded graphite (EG), carbon nanotubes (CNTs), fullerene (C60), graphene (Gr) were applied as filler in the waterborne intumescent coatings to investigate fire resistance, thermal stability, smoke suppression and water resistance. The effects of carbon materials on fire protection and smoke suppression of waterborne intumescent coating were investigated in detail by fire retardant test, thermogravimetry (TG), differential scanning calorimeter (DSC), smoke density test and water resistance test. The carbon layers were characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and particle size distribution. The results of fire protection test and SEM indicated that the fire resistance of coatings was enhanced by adding 1% content of carbon materials. TGA analysis showed that carbon materials could increase the residual weight and thermal stability of the coatings. After immersed in water for 360 h, the results of water resistance test, the carbon materials could form barrier to improve the water resistance of the coatings. Especially, the graphene exhibited the best performance among all the carbon materials.

    更新日期:2019-12-27
  • Simple and rapid method for restoring anti-adhesive organosilane coatings on metal substrates
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-20
    Christine Bandl; Wolfgang Kern; Nina Krempl; Walter Friesenbichler

    Organosilane coatings are widely used as adhesion promoters, anti-adhesive and corrosion protective layers. Although they provide high stability, the harsh conditions during industrial applications lead to damage of the applied coatings over time. In this study, a simple and rapid method for the renewal of worn and damaged organosilane coatings was established. Steel surfaces were coated with a perfluorinated and a dipodal organosilane in order to introduce anti-adhesive properties to the substrate. The applied organosilane coating was removed via flame treatment, which simultaneously activated the substrate surface for recoating with another silane layer. The proposed mechanism was confirmed employing contact angle measurements and X-ray photoelectron spectroscopy. Moreover, it was shown that the quality and performance of the primary and the secondary coatings were comparable regarding to their anti-adhesive properties and chemical composition as well as surface roughness and thermal stability.

    更新日期:2019-12-27
  • Castor-oil-based waterborne acrylate/SiO2 hybrid coatings prepared via sol–gel and thiol-ene reactions
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-20
    Linlong Meng; Haoke Qiu; Di Wang; Bin Feng; Mingwei Di; Junyou Shi; Shuangying Wei
    更新日期:2019-12-27
  • Corrosion protection mechanism of aluminum triphosphate modified by organic acids as a rust converter
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-20
    Liming Feng; Pengyuan Yuan

    Water-borne rust-resistant coatings were prepared by using aluminum triphosphate as the rust conversion agent and a styrene acrylic emulsion, and the mechanism of rust prevention was studied by electrochemical impedance spectroscopy. With increasing soaking time, aluminum triphosphate is further decomposed into orthophosphate to improve the corrosion resistance of the matrix. Within six hours, with increasing immersion time, the impedance value of the conversion film increased, and the maximum impedance of the conversion coating was 954.4 Ω cm2, indicating that the speed of rust transformation to form a protective film was slow and that the corrosion resistance of the conversion film was low. Hydroxyethylidene-1,1-diphosphonic acid (HEDP) and tannic acid were added to modify aluminum triphosphate, and all of them had a chelating effect. Through synergistic effects, the impedance of the modified conversion film reaches 32,495 Ω cm2, which improves the rust conversion and antirust performance and obviously improves the shortcomings of the early antirust performance of aluminum triphosphate used alone. The results of infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy show that the modification with the organic acids involves adsorption on the aluminum triphosphate particles through physical and chemical adsorption. Electrostatic repulsion can prevent the tripolyphosphate ions from agglomerating, making them uniformly dispersed and improving the bonding of the coating film. The modified formulation has better corrosion resistance and rust transformation ability than that of aluminum triphosphate alone.

    更新日期:2019-12-27
  • 更新日期:2019-12-27
  • Susceptibility of hybrid sol-gel (TEOS-APTES) doped with caffeine as potent corrosion protective coatings for mild steel in 3.5 wt.% NaCl
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-23
    Tuan Sherwyn Hamidon; M. Hazwan Hussin

    A series of hybrid sol-gel matrices were synthesized using 3-aminopropyltriethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) incorporating caffeine extracted from leaves of tea. Corrosion inhibition performances of coated mild steel panels exposed to 3.5 wt.% NaCl were evaluated employing electrochemical measurements. Data acquired using complementary corrosion analyses were in accordance where 100 ppm caffeine-doped hybrid sol-gel coating offered the highest inhibition efficiency at 88.79 %. Tafel curves suggested that silane coatings mitigated both the anodic and cathodic reactions simultaneously, i.e. a mixed-type inhibition. Coatings were characterized using FT-IR, SEM/EDX and water contact angle measurements. IR absorption peak obtained at 954 cm−1 revealed the formation of FeOSi bonds. 100 ppm caffeine-doped silane coating offered the highest corrosion resistance since the corrosion protective barrier minimized the oxidation of mild steel to a greater extent where the EDX analysis showed a high intense signal of Fe. Water contact angle analysis depicted the hydrophobicity of coated panels suggesting the tendency of being less prone to water.

    更新日期:2019-12-27
  • 更新日期:2019-12-27
  • Temporary rust preventives—A retrospective
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-24
    Viswanathan S. Saji

    Temporary rust preventives (RPs) are essential in several industrial applications in protecting the metallic structures from corrosion during manufacture, storage and transportation. This review provides a comprehensive account of research advancements in temporary RPs. The review starts with a brief introduction to RPs and their various types. § 2 gives an account of old reported works as several interesting works in this area appeared before the 1980s. § 3 explains the recent R & D on RPs where a separate section on patents are added as most of the latest reports are patented information. § 4 discusses different electrochemical methods employed in studying RPs. The review ends with a short description of commercial RPs. Future scopes of R & D are also presented.

    更新日期:2019-12-27
  • 更新日期:2019-12-27
  • Recent progress in nano-oxides and CNTs based corrosion resistant superhydrophobic coatings: A critical review
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-24
    Vipul Sharma; Vipul Sharma; M.S. Goyat; Amrita Hooda; Jitendra K. Pandey; Adesh Kumar; Rajeev Gupta; Avani Kumar Upadhyay; Rajiv Prakash; John Baptist Kirabira; P. Mandal; Prashant Kumar Bhargav
    更新日期:2019-12-27
  • Preparation of fluorinated/silanized polyacrylates amphiphilic polymers and their anticorrosion and antifouling performance
    Prog. Org. Coat. (IF 3.42) Pub Date : 2019-12-24
    Benfeng Zhu; Zehan Liu; Jiao Liu; Yumeng Yang; Yanbin Meng; Fang Yu; Li Jiang; Guoying Wei; Zhao Zhang
    更新日期:2019-12-27
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