紫外光固化PUA/纳米SiO_2杂化涂层的制备与性能  

Preparation and Properties of UV-Cured PUA/SiO_2 Hybrid Coating

作　　者：崔燕燕[1] 刘峰[1] 袁帅 刘国栋[1] 

机构地区：[1]河北工业大学高分子科学与工程研究所,天津300130 [2]铪盈科技湖州有限公司,浙江湖州313000

出　　处：《涂料工业》2017年第6期40-45,共6页Paint & Coatings Industry

摘　　要：采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对硅溶胶改性,将改性的硅溶胶与聚氨酯丙烯酸酯(PUA)低聚物共混,制备出聚碳酸酯(PC)用紫外光(UV)固化耐磨涂层。用红外光谱仪、热重分析仪、激光粒度仪、接触角测量仪对改性前后的纳米二氧化硅(SiO_2)进行了分析表征,并对制备的UV固化涂层的透光率、雾度、表面硬度和附着力进行了测试。结果表明:纳米SiO_2表面接枝上了KH-570,且亲水性降低。当KH-570用量为60%、改性纳米SiO_2用量为4%时,涂覆UV固化涂层的PC的耐磨性得到最佳改善,耐磨试验后,涂覆添加4%改性纳米SiO_2的UV固化涂层的PC较涂覆未添加纳米SiO_2的UV固化涂层的PC,透光率降低值从4.5%降至1.1%,雾度增加值从21.29%降至3.41%,PC表面涂层的铅笔硬度达到2H。A UV-cured coating for polycarbonate was prepared by blending polyurethane acrylate oligomers with silica sol modified by γ- methacryloxypropyltrimethoxysilane （KH- 570）. The silica sol was characterized by Fourier transform infrared spectrometer （FT-IR）, thermogravimetric analyzer （TGA）, laser particle analyzer and contact angle tester. In addition, the transmittance, haze, hardness and adhesion of the UV- cured coating were tested. The results showed that KH-570 was grafted onto the surface of nano-SiO2, and the hydrophilicity of the modified nano-SiO2 was decreased. When the addition of KH-570 was 60% and the modified nano-SiO2 content was 4%, the scratch resistant property of PC sheet coated with UV-cured coating improved markedly. Compared with the PC sheet coated with coating without nano-SiO2, the coating comprising 4% of the modified nano-SiO2 after scratch test exhibited the decrease rate of light transmittance decreased from 4. 5% to 1.1%, the increase rate of haze decreased from 21.29% to 3.41%. The pencil hardness of the UV-cured coating on polycarbonate reached the level of 2H.

关 键 词：聚碳酸酯 耐磨性 硅溶胶 紫外光固化涂层 

分 类 号：TQ637.83[化学工程—精细化工]