羟基化杜仲胶的制备及其改性UV 固化聚氨酯自修复涂层的研究  

Study on the Preparation of Hydroxylated Eucommia ulmoidesGum and the Modification of UV-curable PolyurethaneSelf-healing Coating

作　　者：陈博 袁天赐 熊文涛 张小平 余喜红 徐祗正 刘娅莉[1,2] CHEN Bo;YUAN Tianci;XIONG Wentao;ZHANG Xiaoping;YU Xihong;XU Zhizheng;LIU Yali(College of Chemical and Chemical Engineering,Hunan University,Changsha 410000,China;Sokan Research Institute of Advanced Surface Treatment and Functional Coatings,Changsha 410600,China)

机构地区：[1]湖南大学化学化工学院,长沙410000 [2]湖南松井先进表面处理与功能涂层研究院有限公司,长沙410600

出　　处：《涂料工业》2024年第9期30-37,共8页Paint & Coatings Industry

摘　　要：为了解决杜仲胶结晶性导致的溶解性差的问题,以便其直接用于改性涂料、黏合剂,基于巯基-烯点击化学反应,采用巯基乙醇与杜仲胶在365 nm紫外光照射条件下合成了羟基化杜仲胶(HEUG),以破坏其结晶性,增强溶解性能。同时,研究了杜仲胶羟基化改性中水、N,N-二甲基甲酰胺、氯仿为溶剂、碳碳双键与巯基的物质的量比与反应时间等对羟基化程度的影响。研究了羟基化杜仲胶对自修复聚氨酯(DSPU)涂层的力学性能、柔韧性、耐溶剂性、附着力以及自修复性能的影响。研究表明,改性后的杜仲胶在常见溶剂中具有优良的溶解性能,且羟基化改性时溶剂为氯仿、反应时间为6 h、巯基与碳碳双键物质的量比为3∶1时,羟基化程度最高,为156 mgKOH/g。将HEUG与自制的自修复聚氨酯树脂复合时,HEUG用量为5%是最优添加量,此时涂层的力学性能强、断裂伸长率高、自修复快、透明度高、涂层的基本性能良好。In order to address the poor solubility of Eucommia ulmoides gum(EUG)caused by its crystallinity,so that its direct use in modified coatings and adhesives,we synthesized hydroxylated Eucommia ulmoides gum(HEUG)by reacting thiol-ethanol with EUG under 365 nm UV light using thiol-ene click chemistry.This process disrupted the crystallinity and enhances solubility.We investigated the effects of different solvents(water,N,N-dimethylformamide,chloroform),molar ratios of C=C double bonds to thiol groups,and reaction times on the degree of hydroxylation of EUG.Additionally,we studied the impact of hydroxylated EUG on the mechanical properties,flexibility,solvent resistance,adhesion,and self-healing performance of self-healing polyurethane(PU)coatings.The results indicated that the modified EUG exhibited excellent solubility in common solvents.The highest degree of hydroxylation,156 mgKOH/g,was achieved using chloroform as the solvent,a reaction time of 6 hours,and a thiol to C=C double bond molar ratio of 3:1.When HEUG was combined with self-made self-healing polyurethane(DSPU)resin,the optimal addition amount was found to be 5%by mass.At this concentration,the coating demonstrated strong mechanical properties,high elongation,rapid self-healing,high transparency,and overall good performance.

关 键 词：羟基化杜仲胶 聚氨酯 自修复涂层 UV固化 

分 类 号：TQ637.8[化学工程—精细化工]