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采用原位乳液聚合法,用经硅烷偶联剂处理过的纳米TiO2,与MMA单体混合,合成PMMA/TiO2纳米复合粒子。探讨了TiO2表面改性机理,并用TG、IR、DSC等对产物进行了表征,表明纳米TiO2被包覆在聚合物PM-MA中。将复合粒子加入紫外光固化涂料,制得复合涂膜。由原子力显微镜照片分析,制备的PMMA/TiO2复合粒子平均粒径约为75 nm。分别在涂膜中添加等量的纳米TiO2和PMMA/TiO2纳米复合粒子,制成两张复合涂膜,比较发现PMMA/TiO2纳米复合粒子在涂膜中的分散情况优于纳米TiO2,呈现良好的纳米级分散,明显改善了TiO2与涂膜的相容性,从而提高了涂膜的硬度及涂膜与基材的附着力。
The in-situ emulsion polymerization method was used to synthesize PMMA / TiO2 nanocomposite particles by mixing the nanometer TiO2 treated with the silane coupling agent with the MMA monomer. The surface modification mechanism of TiO2 was discussed. The products were characterized by TG, IR, DSC and so on. The results showed that nano-TiO2 was coated on the polymer PM-MA. The composite particles into the UV-curable coatings, composite coating obtained. By atomic force microscopy photo analysis, the prepared PMMA / TiO2 composite particles average particle size of about 75 nm. The same amount of nano-TiO2 and PMMA / TiO2 nano-composite particles were added into the coating to make two composite coating films respectively. The results showed that the dispersion of PMMA / TiO2 nano-composite particles was better than that of nano- Nanoscale dispersion, significantly improved the compatibility of TiO2 and coating, thereby enhancing the coating hardness and coating film and substrate adhesion.