摘要
以正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)为水解前驱体,γ-缩水甘油醚基丙基三甲氧基硅烷(GPTMS)为偶联剂。采用溶胶-凝胶法合成了有机-无机杂化环氧树脂。研究了水解单体和用水量对涂层性能的影响。结果表明:当水与水解单体物质的量比为4∶1时,杂化涂层附着力为1级,硬度为4H,耐盐雾时间达到360 h。电化学测试表明,在低频区杂化涂层阻抗值可达105Ω·cm2,比铝合金裸板阻抗值高出2个数量级。表现出良好的防腐蚀性。热重分析显示,杂化树脂具有优异的热稳定性能。利用红外光谱与核磁共振分析了杂化涂层的组成和结构;同时,探讨了溶胶-凝胶杂化涂层的反应机理。
An organic-inorganic hybrid epoxy resin was synthesized from TEOS and MTMS as precursors and GPTMS as coupling agent via sol-gel process. The effects of monomer and water dosage on properties of coatings were studied. The results indicated that a molar ratio of water to monomer 4 ： 1 could allow the hybrid coating to show good properties such as adhesion grade l,hardness 4H and salt fog resistance 360 h. The EIS test showed that the coating had excellent corrosion resistance, the impedance of hybrid coatings was up to 105 ~＇~.cm2, which was approx.two orders of magnitude higher than that of bare A1 alloy plate. The TG-DSC test indicated that the coating had excellent thermal stability. The structure and composition of hybrid coating were analyzed by FT-IR and NMR. Meanwhile, the reaction mechanism of sol- gel organic-inorganic hybrid coating was also investigated.
出处
《涂料工业》
CAS
CSCD
北大核心
2014年第5期18-24,共7页
Paint & Coatings Industry
基金
广东省教育部产学研结合项目(2012A090300004)
上海市纳米专项(12nm0500300)
上海高校青年教师培养资助计划(B.37-0407-11-003)
关键词
溶胶-凝胶
杂化涂层
耐盐雾
电化学
反应机理
sol-gel
hybrid coating
salt fog resistance
electrochemistry
reaction mecha-nism
