Preparation and Characterization of a Robust, High Strength, and Mildew Resistant Fully Biobased Adhesive from Agro-Industrial Wastes,ACS Applied Polymer Materials

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Preparation and Characterization of a Robust, High Strength, and Mildew Resistant Fully Biobased Adhesive from Agro-Industrial Wastes
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsapm.1c00929
Huan Chen ₁ , Shiqing Chen ₁ , Dongbin Fan ₁ , Yong Wang ₂

Affiliation

Recent decades have witnessed an increasing trend of replacing conventional formaldehyde-based adhesives with sustainable and ecofriendly biobased adhesives in the commercial wood industry. The present study developed a full biomass utilization design for adhesives consisting of a cheap soybean meal and a lignin-based crosslinking agent (EXL). The primary component of the latter, i.e., epoxidized lignin, was synthesized using alkaline lignin and epichlorohydrin under simple reaction conditions. The Fourier transform infrared, proton nuclear magnetic resonance, and carbon-13 nuclear magnetic resonance analyses revealed the epoxy characteristic peaks in EXL, further validating the efficacy of the design developed. This simple design successfully synthesized the EXL with more epoxy groups. Moreover, a fully biobased adhesive with a wet bonding strength of up to 0.96 MPa was produced by incorporating the EXL as a sole crosslinking agent, which satisfies the requirements for interior plywood use. Furthermore, the effect of the lignin-based crosslinking agent with more epoxy groups on the structural changes, thermal stability, and micromorphology of the resulting adhesive was investigated. The incorporation of EXL exhibited a beneficial impact on the soy adhesive with improved wet bonding strength and thermal stability. Additionally, the antimold observation experiment under a high humidity environment demonstrated that the EXL contributed to the excellent antimold performance of the adhesive.

中文翻译：

从农业工业废物中制备坚固、高强度、抗霉变的全生物基粘合剂并表征

近几十年来，在商业木材工业中，用可持续和生态友好的生物基粘合剂取代传统的甲醛基粘合剂的趋势越来越大。本研究开发了一种完整的生物质利用设计，用于由廉价豆粕和木质素基交联剂 (EXL) 组成的粘合剂。后者的主要成分，即环氧化木质素，是在简单的反应条件下使用碱性木质素和环氧氯丙烷合成的。傅里叶变换红外、质子核磁共振和碳 13 核磁共振分析揭示了 EXL 中的环氧树脂特征峰，进一步验证了所开发设计的功效。这种简单的设计成功地合成了具有更多环氧基团的 EXL。而且，通过将 EXL 作为唯一的交联剂，生产出湿粘合强度高达 0.96 MPa 的全生物基粘合剂，满足室内胶合板使用的要求。此外，研究了具有更多环氧基团的木质素基交联剂对所得粘合剂的结构变化、热稳定性和微观形貌的影响。EXL 的掺入对大豆粘合剂具有改善的湿粘合强度和热稳定性显示出有益的影响。此外，在高湿度环境下的防霉观察实验表明，EXL有助于粘合剂的优异防霉性能。此外，研究了具有更多环氧基团的木质素基交联剂对所得粘合剂的结构变化、热稳定性和微观形貌的影响。EXL 的掺入对大豆粘合剂具有改善的湿粘合强度和热稳定性显示出有益的影响。此外，在高湿度环境下的防霉观察实验表明，EXL有助于粘合剂的优异防霉性能。此外，研究了具有更多环氧基团的木质素基交联剂对所得粘合剂的结构变化、热稳定性和微观形貌的影响。EXL 的掺入对大豆粘合剂具有改善的湿粘合强度和热稳定性显示出有益的影响。此外，在高湿度环境下的防霉观察实验表明，EXL有助于粘合剂的优异防霉性能。

更新日期：2021-10-08

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