高硬度UV固化水性聚氨酯的合成与性能  

Synthesis and Properties of High Hardness Waterborne UV-Curing Polyurethane

作　　者：赵金强[1] 石耀东[1] 魏燕彦[1] 

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《涂料工业》2014年第3期43-49,共7页Paint & Coatings Industry

基　　金：国家自然科学基金资助项目(51103078);青岛市科技计划基础研究项目任务书(13-1-4-244-jch)资助

摘　　要：以聚四氢呋喃醚与聚环氧丙烷醚为柔性链段合成水性光固化聚氨酯,并制备乳液。研究了聚醚软段和小分子扩链剂的类型对乳液和涂膜性能的影响,以及固化时间、光引发剂的添加量对涂膜硬度的影响。采用红外光谱(FT-IR)对树脂的结构进行表征,并采用动态光散射法(DLS)对乳液的粒径进行分析。结果表明:乳液平均粒径<65 nm;乳液经高温稳定测试、离心测试、冻融测试和稀释测试后絮凝率均<2.6%,具有很好的稳定性;实验所得乳液在木材表面涂覆,基材光泽稍有提高;涂膜耐冲击性>50 cm,附着力为1级,铅笔硬度达到5H。The title waterborne UV curable polyurethanes were synthesized with polytetra- hydrofuran ether and poly （propylene oxide） ether as soft segments and their emulsions were prepared. Effects of soft segments and small molecular chain extenders on properties of emul- sions and coatings and influence of curing time and photoinitiator on coating＇s hardness were investigated. Molecular structure was characterized by Fourier transform infrared （FF-IR） spectra and emulsion particle size was measured by dynamic light scattering （DLS）. It was in- dicated that the average particle sizes of emulsions were less than 65 nm, the obtained emul- sions showed good stability. The calculated gel percentage after high temperature aging test, centrifugation test, freezing-thaw test and dilution test were less than 2.6%. Coatings on wood substrates had a gloss 1 higher than original substrate. Their impact strength was larger than 50 cm and adhesion grade 1, and pencil hardness upto 5H.

关 键 词：UV固化 水性聚氨酯 高硬度 玻璃涂层 木材底涂 

分 类 号：TQ637.83[化学工程—精细化工]