UV固化蓖麻油基聚氨酯丙烯酸酯/SiO2杂化材料的制备与性能Q

以异佛尔酮二异氰酸酯（IPDI）、蓖麻油（CO）和丙烯酸羟乙酯（HEA）合成了蓖麻油基聚氨酯丙烯酸酯（COPUA），以正硅酸乙酯（TEOS）和3-(异丁烯酰氧)丙基三甲氧基硅烷（MEMO）通过溶胶-凝胶法制备了改性硅溶胶，作为无机相与COPUA有机相复合得到了UV固化COPUA/SiO2杂化材料。调节MEMO与TEOS的配比得到一系列改性硅溶胶，通过测试确定了MEMO与TEOS的最佳配比为1：1（MT-1）。在此基础上，改变MT-1的添加量得到UV固化COPUA/SiO2杂化材料。用FT-IR、TEM、SEM、TGA等对杂化材料和涂层进行结构表征，测试复合涂层的力学性能和表面性能。当MT-1添加量为COPUA树脂质量的15%时，涂层内部SiO2粒子分布均匀，涂层表面光滑平整，光透过率达到100.2%，硬度为5H，附着力0级，柔韧性1mm；涂膜拉伸强度达到13.52MPa，断裂伸长率为7.49%。

Preparation and properties of UV-cured castor oil-based polyurethane acrylate/SiO2 hybrid materials

Castor oil-based polyurethane acrylate (COPUA) was synthesized from isophorone diisocyanate (IPDI), castor oil (CO) and hydroxyethyl acrylate (HEA). Modified silica sol was prepared by sol-gel method with tetraethyl orthosilicate (TEOS) and 3- (isobutenyl oxide) propyl trimethoxysilane (MEMO). A series of modified silica sols were obtained by adjusting the ratio of TEOS to MEMO. The optimal ratio of MEMS to TEOS was determined to be 1 (MT-1). Based on this, the UV-cured COPUA/SiO2 hybrid material was obtained by changing the addition amount of MT-1. The hybrid materials and coatings were characterized by FT-IR, TEM, SEM, TGA, et al. the mechanical and surface properties of the composite coatings were also tested. The result showed that when the amount of modified silica sol is 15%(based on the mass of COPUA resin, the same below), the SiO2 particles in the coating are evenly distributed. The coating surface is smooth and flat, which can be proved by the excellent light transmittance(100.2%). The hardness of the composite coating is 5H, the adhesion is grade 0 and the flexibility is 1mm; The tensile strength of the film reaches 13.52MPa and the elongation of section is 7.49%,which has a good application prospect in the modification and protection of plastic surface.