溶胶-凝胶法制备苯基甲基二甲氧基硅烷改性聚乙烯醇缩丁醛涂层

摘要

To improve its thermotolerance and corrosion resistance, polyvinyl butyral (PVB) coating was modified by phenylmethyldimethoxysilane(PDMS) through sol-gel method with phosphoric acid as the catalyst and tetraethyl orthosilicate (TEOS) as the precursor. PVB and the modified product were characterized by means of FTIR,TG,XRD,SEM,polarization and EIS methods. The results showed that hydroxyls in PVB molecules fully reacted with alkoxys in phenylmethyldimethoxysilane molecules. SiO2 nano-particles generated and dispersed well with a uniform size in the modified PVB coating. Both the thermotolerance and the corrosion resistance of the modified PVB coating were greatly improved. Compared to the pure PVB coating,electric resistance of the modified PVB coating was enhanced about 3 orders of magnitude.%为改善聚乙烯醇缩丁醛(PVB)涂层的耐温性和耐腐蚀性,以磷酸为催化剂、正硅酸乙酯(TEOS)为前体进行溶胶-凝胶反应,用苯基甲基二甲氧基硅烷(PDMS)对PVB进行改性;并用FTIR、TG、XRD、SEM、极化和EIS等手段对改性前后的涂层进行了表征.实验结果表明,改性PVB分子结构中的羟基完全与PDMS分子中的烷氧基发生反应;改性PVB涂层中有纳米级SiO2填料生成,SiO2在PVB涂层中的分散性良好,且粒径较均匀;改性PVB涂层的耐腐蚀性和耐温性均有所提高;与纯PVB涂层相比,改性PVB涂层的阻抗值提高了3个数量级.