Abstract: A UV-cured coating for polycarbonate was prepared by blending polyurethane acrylate oligomers with silica sol modified by y-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-SiO 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 in-crease 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.

Key words: polyearbonate, abrasion resistance, silica sol, UV-cured coating

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（ＳｉＯ２ ）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 ＳｉＯ２ 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 ＳｉＯ２ 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 ＳｉＯ２ 的 ＵＶ 固化涂层的 ＰＣ 较涂覆未添加纳米 ＳｉＯ２ 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。

关键词: 聚碳酸酯, 耐磨性, 硅溶胶, 紫外光固化涂层