以硅酸乙酯(TEOS)、乙烯基三乙氧基硅烷(VTES)和二甲基二甲氧基硅烷(DMDMS)为硅烷单体,以柠檬酸为催化剂,采用溶胶-凝胶法制备乙烯基甲基硅树脂,并添加固化剂γ-氨丙基三乙氧基硅烷(APTES)使制备的硅树脂可以在较低温度(50℃)下固化。采用红外光谱(FT-IR)对比硅树脂固化前后的结构变化;通过接触角、吸水率、电化学阻抗谱(EIS)测试了不同n(R)/n(Si)、n(Si—OCnH2n+1)/n(H2O)、pH以及固化剂用量对硅树脂涂层耐水性和防腐蚀性能的影响。结果表明:当n(R)/n(Si)=1.4/1、n(Si—OCnH2n+1)/n(H2O)=0.2/0.2、pH=2.6、固化剂用量为4%(质量分数)时,涂层具有较好的性能。
Vinylmethyl silicone resin was prepared by sol-gel method with tetraethyl orthosilicate (TEOS),vinyl triethoxy silane (VTES),and dimethyl dimethoxysilane (DEDES) as silane monomers,and citric acid as catalyst.The resin could cure at low temperature(50℃) by using γ-aminopropyl triethoxy silicon (ATES) as hardener.FT-IR was used to compare the structure of silicon resin before and after cured.The hydrophobic and anticorrosion properties of coatings with different n(R)/n(Si),n(Si—OCnH2n+1)/n(H2O),pH and content of hardener were tested by contact angle,water absorption,and electrochemical impedance spectroscopy (EIS).The results showed that the coating had best properties when n(R)/n(Si)=1.4/1,n(Si—OCnH2n+1)/n(H2O)=0.2/0.2,pH=2.6 and content of hardener was 4wt%.
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基金资助
黑龙江省省属高等学校基本科研业务费科研项目(135209214)
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