生物基增韧剂的制备与性能研究  

Preparation and Performance Analysis of Bio-based Toughening Agents

作　　者：娄星原 黎灿光 王祥伟 黄西桐 冯朝波 梁浩忠 陈建军 陈春秀 LOU Xingyuan;LI Canguang;WANG Xiangwei;HUANG Xitong;FENG Chaobo;LIANG Haozhong;CHEN Jianjun;CHEN Chunxiu(Guangzhou Baiyun Chemical Industry Co.,Ltd.,Guangdong Guangzhou 510700,China)

机构地区：[1]广州白云科技股份有限公司,广东广州510700

出　　处：《广州化工》2024年第24期60-62,共3页GuangZhou Chemical Industry

摘　　要：本研究开发了一种基于生物质原料的环保型高性能环氧胶粘剂,以解决传统环氧胶粘剂韧性不足、脆性较大的问题。研究以腰果壳提取液和蓖麻子提取液为主要原料,通过两步法合成了生物基聚氨酯增韧剂。第一步将蓖麻油与二苯基甲烷二异氰酸酯(MDI)反应,得到异氰酸酯封端的聚氨酯预聚体;第二步加入腰果酚进行封闭反应,制备出具有长柔性链段的聚氨酯增韧剂。将所得增韧剂引入环氧胶粘剂体系中,通过优化添加量显著提升了胶粘剂的性能。实验结果表明,当增韧剂添加量为40份时,剪切强度从13.3 MPa提高至27.3 MPa,增幅达105%;T型剥离强度从2.7 N/mm提升至9.2 N/mm,增幅达240%。红外光谱分析验证了增韧剂中异氰酸酯基团的成功封闭以及在固化过程中与环氧树脂发生的交联反应。力学测试结果表明,增韧剂通过形成互穿网络结构,不仅增强了环氧胶粘剂的柔韧性,还提高了其耐久性和机械性能。该研究为基于生物质原料的增韧剂设计提供了新思路,展现了生物基材料在胶粘剂领域的巨大潜力,为高性能和环保胶粘剂的开发提供了理论依据和实践指导。An environmentally friendly,high-performance epoxy adhesive based on bio-based raw materials was developed to address the issues of low toughness and high brittleness in traditional epoxy adhesives.Cashew nutshell extract and castor seed extract were utilized as primary bio-based raw materials to synthesize a bio-based polyurethane toughening agent via a two-step method.In the first step,castor oil was reacted with methylene diphenyl diisocyanate(MDI)to produce an isocyanate-terminated polyurethane prepolymer.In the second step,cardanol was introduced for a blocking reaction,resulting in a polyurethane toughening agent with long flexible chain segments.By incorporating the synthesized toughening agent into the epoxy adhesive system and optimizing the addition amount,the adhesive's performance was significantly improved.Experimental results revealed that with a toughening agent content of 40 parts,the shear strength increased from 13.3 MPa to 27.3 MPa,representing a 105%improvement,while the T-peel strength rose from 2.7 N/mm to 9.2 N/mm,a 240%enhancement.Fourier-transform infrared(FTIR)spectroscopy confirmed the successful blocking of isocyanate groups in the toughening agent and their subsequent crosslinking reactions with epoxy groups during curing.Mechanical testing demonstrated that the toughening agent formed an interpenetrating network structure within the adhesive,enhancing flexibility and improving durability and mechanical properties.This study provided a novel approach to designing bio-based toughening agents,showcasing the immense potential of bio-based materials in the adhesive industry and offering theoretical and practical guidance for developing high-performance,environmentally sustainable adhesives.

关 键 词：环氧胶粘剂 腰果酚 封闭型聚氨酯 增韧 

分 类 号：TQ914.1[化学工程]