相对分子质量和聚醚含量对双组分水性聚氨酯性能的影响  

Effects of Molecular Weight and Polyether Content on Properties of Waterborne 2K Polyurethane

作　　者：石耀东[1] 魏燕彦[1] 杜秀才 王虎[1] 赵金强[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12期39-43,共5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);山东省墙材革新与建筑节能科研开发项目(2013-357)资助

摘　　要：合成了3组不同相对分子质量和聚醚含量的端羟基水性聚氨酯,考察了其乳液性能和涂膜性能,并研究了聚氨酯的相对分子质量和聚醚含量对乳液和涂膜性能的影响。研究表明:随着聚氨酯相对分子质量的增大,乳液粒径增大,粒径分布变宽,涂膜吸水率下降。聚醚链段含量升高,乳液粒径减小,粒径分布变窄,涂膜吸水率升高。通过对聚氨酯分子结构的优化,涂膜硬度达到4H,耐冲击性50 cm,对折3次后裂痕长度小于0.5 mm,吸水率为11.94%。Three kinds of hydroxyl-terminated polyurethanes with different molecular weight and polyether content were synthesized.The effects of molecular weight and polyether content on the properties of polyurethane dispersions and their cured films were investigated.The results showed that the particle size and distribution increased while the water absorption decreased with the increase of molecular weight,and comparatively an opposite tendency occurred as the polyether content increased.The optimization of molecular structure might allow the cured film to show good properties such as hardness 4H,impact strength more than 50 cm,bending property less than 0.5 mm and water-absorption 11.94%.

关 键 词：双组分水性聚氨酯 高硬度 相对分子质量 聚醚含量 

分 类 号：TQ637.81[化学工程—精细化工]