UV固化超支化PUA/SiO_2杂化涂料的制备及性能研究

Study on preparation and properties of UV-curable hyperbranched polyurethane acrylate/SiO_2 hybrid coating

以TEOS(正硅酸乙酯)为无机前驱体、KH-570(γ-甲基丙烯酰氧丙基三甲氧基硅烷)为改性剂,采用溶胶凝胶法在酸性催化条件下合成了改性硅溶胶;然后以HPUA[超支化PUA(聚氨酯丙烯酸酯)]为低聚物、PETA(季戊四醇三丙烯酸酯)为活性稀释剂,制备了UV(紫外光)固化HPUA/SiO_2杂化涂料。研究结果表明:杂化涂膜的热稳定性高于纯PUA涂膜;当w(改性硅溶胶)=16%(相对于单体总质量而言)时,杂化涂料的综合性能相对最好,其柔韧性为2 mm、铅笔硬度为4H和附着力为1级,并且涂膜的耐溶剂性、耐腐蚀性和耐磨性俱佳。

With TEOS （tetraethoxysilane） as inorganic precursor, KH-570 （T-methyl aeryloytoxy propyl trimethoxy silane） as modifier, a modified silica sol was synthesized by sol gel method under the condition of acidity catalytic. Then, with HPUA[hyperbranched PUA （polyurethane acrylate）] as oligomer, PETA（pentaerythritol triacrylate） as active diluent, an UV （ultraviolet） curing HPUA/SiO2 hybrid coating was prepared. The research results showed that the thermal stability of hybrid film was higher than that of pure PUA coating. The hybrid coating had the relatively optimal combination property because its flexibility was 2 mm, pencil hardness was 4H, and adhesion was level- 1, and its film had the good solvent resistance, corrosion resistance, and wear resistance when mass fraction of modified silica sol was 16% in total monomers.