硅丙乳液改性的自固化高耐水性硅酸盐涂料制备及性能

Preparation and Properties of Self-curing Silicate Coatings with High Water Resistance Modified by Silicon-acrylic Emulsion

传统无机硅酸盐涂料使用水作为主要的分散剂,涂膜固化过程中收缩较大,容易出现裂纹,同时受可溶性离子影响,耐水性能差。本研究以硅酸钠(Na;SiO;)作为无机组分,以甲基三甲氧基硅氧烷(MTMS)为偶联剂,硅丙乳液为有机组分,制备的Na;SiO;-MTMS-硅丙乳液作为成膜物质,二氧化钛、玻璃粉作为填料,氟硅酸钠(Na;SiF;)作为固化剂,并辅以其他助剂制备自固化高耐水硅酸盐涂料。研究了Na;SiF;、低熔点玻璃粉与硅丙乳液等对涂膜外观、附着力、硬度、耐磨性性能、耐腐蚀性能的影响,实验结果表明,所制备的Na;SiO;-MTMS-硅丙乳液能有效改善硅酸盐涂料的成膜性能和耐水性能;氟硅酸钠能有效提高涂料的固化率。通过条件试验,获得了涂料的优化配方。

Traditional inorganic silicate coatings using water as the main dispersant suffers the great shrinkage during the curing process which tends to produce cracks and poor water resistance due to the soluble ions.In this paper,Na;SiO;-MTMS-silicone acrylate emulsion as film forming material was prepared using sodium silicate (Na;SiO;) as inorganic component,methyltrimethoxysilane (MTMS) as coupling agent,silicone acrylate emulsion as organic component.Self-curing high water resistant silicate coating was fabricated through further adding titanium dioxide,glass powder as filler,sodium hexafluosilicate (Na;SiF;)as curing agent,and other auxiliaries.The effects of Na;SiF;,low melting point glass powder and silicone acrylic emulsion on the appearance,adhesion,hardness,wear resistance and anti-corrosion of the coating were studied.The results showed that the Na;SiO;-MTMS-silicone acrylic emulsion can effectively improve the film forming property and water resistance of silicate coating and that Na;SiF;improved the curing rate of the coating.Through the condition test,the optimized formula of the coating was obtained.