UV固化超支化聚氨酯木器涂料的制备及性能研究  

Preparation and Performance Study of UV-curable Hyperbranched Polyurethane Wood Coatings

作　　者：朱昊鑫 谭鹏云 张增帅 赵晓彤 马晓婧 周家豪 邵迎庆 韦双颖[1] ZHU Haoxin;TAN Pengyun;ZHANG Zengshuai;ZHAO Xiaotong;MA Xiaojing;ZHOU Jiahao;SHAO Yingqing;WEI Shuangying(Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《涂料工业》2024年第7期29-34,共6页Paint & Coatings Industry

基　　金：中央高校成栋科研创新团队专项计划项目(2572023CT05);大学生创新训练计划项目(S202310225071)。

摘　　要：传统UV固化聚氨酯树脂以端双键封端,极性基团少,降低了涂层在木材表面的附着力。采用两步法将一种多羟基的超支化结构引入由不同异氰酸酯制备的聚氨酯体系中并封端,合成了含有多羟基超支化结构的紫外光固化聚氨酯木器涂料。采用凝胶渗透色谱仪(GPC)、核磁共振波谱仪(NMR)、傅立叶变换红外光谱仪(FT-IR)、热重分析仪(TG)、动态热机械分析仪(DMA)等测试表征方法,研究了紫外光固化聚氨酯树脂及木器涂料的各项性能。结果表明:—NCO与—OH物质的量比为1∶8的多羟基超支化异氰酸酯制备成功并引入到聚氨酯中,其中以六甲撑基二异氰酸酯为主体聚氨酯的拉伸强度达到34.69 MPa,弹性模量达到10.64 MPa,玻璃化转变温度为102.02℃,漆膜附着力为0级。此方法为具有高强度、高附着力的UV固化型聚氨酯木器涂料提供了创新解决方案。The traditional UV-curable polyurethane resins were terminated with double bonds,with fewer polar groups,which reduced the adhesion of the coating on the surface of wood.This paper adopted a two-step method to introduce a multi hydroxyl hyperbranched structure into polyurethane systems prepared with different isocyanates and block them,synthesizing a UV-curable polyurethane wood coating containing multi hydroxyl hyperbranched structure.The properties of UV-curable polyurethane resin and wood coatings were investigated by gel permeation chromatography(GPC),nuclear magnetic resonance(NMR),fourier infrared spectroscopy(FT-IR),thermogravimetric analysis(TGA),dynamic thermal mechanical analysis(DMA).The results indicated that a polyhydroxy hyperbranched isocyanate with a molar ratio of—NCO to—OH of 1∶8 had been successfully prepared and introduced into polyurethane.Among them,the polyurethane with 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]-cyclohexane as the main component had a tensile strength of 34.69 MPa,an elastic modulus of 10.64 MPa,a glass transition temperature of 102.02℃,and a paint film adhesion of level 0.This method provided an innovative solution for UV curable PU wood coatings with high strength and adhesion.

关 键 词：UV固化 超支化 聚氨酯 木器涂料 

分 类 号：TQ637.83[化学工程—精细化工]