高性能水性UV固化聚氨酯的合成与性能研究

摘要

A waterborne UV -curing polyurethane emulsion modified by epoxy acrylate(EA) and hydroxy-polydimethylsiloxane was prepared. Effects of the content of EA, organic silicone, DMBA, silane coupling a-gent and degree of neutralization on the properties of the WPU emulsion and the films were discussed. The structure of WPU was characterized by FT - IR and contact angle meter. The result showed that the film of waterbome UV - curing polyurethane modified by EA and organic silicone had higher hardness, better water resistance and adhesion compared to unmodified WPU. When the content of EA, organic silicone, DMBA, si-lane coupling agent was respectively 4% , 2% , 8% and 1 % , degree of neutralization was 80% , the water-borne UV - curing polyurethane emulsion showed good performance and higher contact angle.%用环氧丙烯酸酯(EA)、羟基硅油合成了环氧/有机硅改性水性光固化聚氨酯乳液(WPU)；研究了EA、羟基硅油、亲水扩链剂二羟甲基丁酸(DMBA)的用量,中和度和硅烷偶联剂的添加量对乳液和涂膜性能的影响.用红外光谱和接触角测量仪对树脂进行表征.结果表明:通过EA、羟基硅油改性的水性光固化聚氨酯涂膜的硬度高、附着力强、耐水性较好,克服了未改性水性光固化聚氨酯的缺点.当EA用量为4％、羟基硅油为2％、DMBA为8％、中和度为80％、硅烷偶联剂的添加量为1％时,水性光固化聚氨酯乳液的综合性能较好,树脂接触角大大提高.