UV固化亲水涂料的制备及性能研究

Preparation and properties of a UV cured hydrophilic coating

在丙烯酸酯亲水树脂上引入光敏单体甲基丙烯酸缩水甘油酯(GMA),使涂膜能常温固化且具有良好的亲水性和耐水性能。研究了引发剂和链转移剂摩尔分数对丙烯酸酯共聚物分子量、分子量分散度的影响,以及稀释剂、单体配比和GMA摩尔分数对涂膜亲水性和耐水性的影响。实验结果表明,当引发剂摩尔分数为1.2%,链转移剂摩尔分数为2%时,可制得分子量1300左右,分子量分散度1.85的丙烯酸酯共聚物;当GMA摩尔分数为15%(相对于AA物质的量)、稀释剂为丙烯酸羟丙酯(HPA)且质量分数为30%、AA与HPA的质量比为6∶4时,薄膜亲水和耐水的综合性能达到最佳,亲水角为14.2°,失重率为1.61%。

A novel method to prepare a hydrophilic coating is described in this paper whereby a hydrophilic acrylate resin was modified by grafting glycidyl methacrylate （GMA） , which after curing under UV had excellent hydroph- licity and water tolerance. A study was conducted of the factors affecting the molecular weight of the acrylate copol- ymer and the coating properties. The results showed that the copolymer molecular weight was about 1300 and the polydispersity index （PDI） was 1.85 when the mole fraction of the initiator was 1.2% and the mole fraction of the chain transfer agent was 2%. The UV cured coating possessed favorable overall performance with a water contact angle of 14.2~ and a weight loss ratio of 1.61% when the weight proportion of acrylic acid and hydroxypropyl acry- late （HPA） was 6： 4, the mole fraction of GMA was 15% and the mass fraction of the reactive diluent HPA was 30%.