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Water resistance improvement of paperboard by coating formulations based on nanoscale pigments
Journal of Coatings Technology and Research ( IF 2.3 ) Pub Date : 2020-08-10 , DOI: 10.1007/s11998-020-00386-5
Wasin Thitsartarn , Tunyarut Jinkarn

This research assessed how type, particle size, and concentration of pigment in coating formulations influenced water and water vapor barriers of paperboard packaging. Calcium carbonate (CaCO3) and kaolin of micro- and nanosize of 1 and 0.05 µm, respectively, were added to 3% (w/v) gelatinized cassava starch to prepare coating formulations with different pigment concentrations of 5, 15, and 25% (w/v). These were applied on paperboard surfaces using the rod coating technique. Results showed that water resistance of paperboard, evaluated by contact angle (CA) and water absorptiveness (Cobb) were strongly influenced by pigment type (chemistry), particle size and shape, and pigment concentration (coating layer thickness). A hydrophobic surface (CA > 100) was obtained only for the nano-CaCO3 formulation with 25% (w/v) by combined effects of the nanosize scale, the spherical shape, and the hydrophobic surface of CaCO3 particulates. Kaolin nanoparticle coatings produced hydrophilic surfaces (CA ~ 90) with high water absorptiveness, while high concentrations of kaolin microparticle coating slightly improved water and water vapor barriers by compact arrangement of flattened particles. Mechanical strength properties of the paperboard were not significantly affected by coatings, but surface cracking was observed for large particle size or at high pigment concentration due to the increase in pigment/starch ratio.



中文翻译:

通过基于纳米颜料的涂料配方改善纸板的耐水性

这项研究评估了涂料配方中颜料的类型,粒径和浓度如何影响纸板包装的水和水蒸气屏障。将分别为1和0.05 µm的微米和纳米尺寸的碳酸钙(CaCO 3)和高岭土添加到3%(w / v)糊化的木薯淀粉中,以制备具有5、15和25%不同颜料浓度的涂料配方(w / v)。使用棒涂技术将它们涂在纸板表面上。结果表明,通过接触角(CA)和吸水率(Cobb)评估的纸板的耐水性受颜料类型(化学),粒径和形状以及颜料浓度(涂层厚度)的强烈影响。仅对于纳米CaCO 3获得疏水表面(CA> 100)纳米尺寸,球形和CaCO 3颗粒的疏水性表面的综合作用,可制成含25%(w / v)的配方。高岭土纳米颗粒涂料产生的亲水性表面(CA〜90)具有高吸水率,而高浓度的高岭土微粒涂层则通过扁平颗粒的紧密排列而略微改善了水和水蒸气的阻隔性。纸板的机械强度性能不受涂层的影响不大,但是由于颜料/淀粉比的增加,在大粒径或高颜料浓度下观察到表面开裂。

更新日期:2020-08-11
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