硅烷偶联剂对光固化PUA/SiO_2杂化涂料的改性研究  

The Effect of Silane Coupling Agent Containing Methacryloxy Group on UV-Curable Acrylate-Modified Polyurethane/SiO_2 Hybrid Coatings

作　　者：蔡星[1] 李宝芳[1] 罗英武[1] 

机构地区：[1]浙江大学化学工程与生物工程学系聚合反应工程国家重点实验室,浙江杭州310027

出　　处：《高校化学工程学报》2008年第2期361-364,共4页Journal of Chemical Engineering of Chinese Universities

摘　　要：研究溶胶-凝胶法制备聚氨酯丙烯酸酯(PUA)/纳米二氧化硅(SiO2)复合涂料中加入硅烷偶联剂进行原位改性的作用机理,以期得到性能优良的有机-无机杂化纳米复合涂料。考察了硅烷偶联剂用量的变化对聚氨酯丙烯酸酯涂料性能的影响。结果表明,用硅烷偶联剂对溶胶-凝胶法制备的纳米二氧化硅进行改性,能够实现纳米颗粒的均匀分散,并在其表面形成良好的界面结合层;且适量的硅烷偶联剂的加入使聚氨酯丙烯酸酯涂料显示出优良的机械性能,表现出纳米材料特有的既增强又增韧特性,尤其是耐磨性能可以提高7倍。UV-curable acylate-modified polyurethane/SiO2 hybrid coatings was prepared through the sol-gel process of tetraethoxysilane in the presence of acrylate-modified polyurethane.The silane coupling agent containing methacryloxy group,γ-methacryloxypropyltrimethoxysilane,was used to stabilize the nanoparticles of SiO2 formed via the sol-gel process.The hacryloxy group of the silane coupling agent would react with acylate-modified polyurethane during UV curing,and form a very strong interfacial interaction between the organic and inorganic phases.The silane coupling agent is effective for the well dispersion of the nanoparticles in the polyurethane matrix.When the dosage of the silane coupling agent is less than 50 %（wt） of tetraethoxysilane,the size of the nanoparticles is around 100 nm.The introduction of the silane coupling agent dramatically increases the mechanic properties of the cured coatings when the dosage of the coupling agent is 30%～50 %（wt） of the tetraethoxysilane dosage.In particular value of the cured coatings could be reduced by a factor of 7.

关 键 词：紫外光固化 纳米复合涂料 溶胶-凝胶 硅烷偶联剂 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] TQ325.7