接枝改性硅丙复合涂层的制备及性能研究

Preparation and Properties of Jointing Acrylate Modified Silica Coating

以γ-甲基丙烯酰氧丙基-三甲氧基硅烷(KH-570)和甲基丙烯酸酯类(MMA)为原料,过氧化苯甲酰(BPO)为引发剂,在非水溶剂中聚合先制得丙烯酸酯和KH-570的预聚体,通过预聚体与正硅酸乙酯(TEOS)共同水解制得了稳定的改性二氧化硅溶胶,同时,用一步法由TEOS、KH-570及MMA共聚也制备了丙烯酸酯改性硅溶胶。2种接枝后的二氧化硅溶胶通过浸渍提拉法在金属或者玻璃基片上成膜。运用激光光散射,FTIR、UV分光光度仪、铅笔硬度测试仪和附着力试验等对改性二氧化硅硅溶胶及涂层样品进行了分析和表征。结果表明,丙烯酸酯预聚体水解法具有很高的接枝率,制备的溶胶粒径易于控制,随水解条件的改变,可得到纳米至亚微米粒度的改性二氧化硅溶胶,并且成膜性能好。丙烯酸酯接枝改性后的二氧化硅涂层光学透过率高,对上述基材具有较好附着力,铅笔硬度均达到4H以上,对基材具有较好保护作用。

The prepolymer of KH-570 and acrylate were first co-polymerized with benzoyl peroxide （BPO） as initiator, γ-methacryloxypropyltrimethoxysilane （KH-570） and methyl methacrylate （MMA） as the sol precursor. Then modified silica sol was obtained by co-hydrolyzing tetraethylorthosilicate （TEOS） and prepolymer. Meanwhile, acrylate modified silica sol was prepared using TEOS, KH-570 and MMA. The modified organic-inorganic hybrid sol was then used to coat on metal （brass or stainless steel） or glass substrates by dipping method and sintered at 120 ℃ for 2 h. The coating structure was analyzed with FTIR spectroscopy. Surface structure and particle diameter were characterized with SEM. Hardness was examined by pencil hardness instrument. Non-crystalline phase was showed by XRD. Experimental results demonstrate that the coating of this organic-inorganic hybrid exhibits a uniform and compact surface with well performance in adherence and hardness, as well as high optics transmittance and good protection to the substrate.