有机-无机杂化对无机富锌涂料的性能影响研究

Influence of Organic-inorganic Hybrid on the Properties of Inorganic Zinc-rich Coatings

摘要:

以硅酸钾溶液与硅溶胶的反应物为基料，选用四甲基氢氧化铵对硅丙乳液进行催化水解，并以适度水解的硅丙乳液改性硅酸钾溶液与硅溶胶基料，通过有机-无机杂化的方式将其与1:2.6的锌粉进行混合，制备了一种水性无机硅酸钾富锌涂料。考察了模数、固含量、经适度水解的硅丙乳液掺量等对水性无机富锌涂料性能的影响，并对相关作用机理进行了分析。结果表明：当硅酸钾模数 为3.3，硅酸钾溶液固含量为25.0%，经适度水解的硅丙乳液的添加量为硅酸钾溶液固含量的5%～10%时，涂膜的硬度为5H，柔韧性为4mm，附着力为1级，7d耐水性和耐人工海水性能较好，所配制涂料的综合性能最优。

Abstract:

A modified potassium silicate solution was prepared by the reactant of potassium silicate and silica sol, moderately hydrolyzed silicone-acrylic emulsion which has been catalytic hydrolyzed with tetramethylammonium hydroxide. The water-based inorganic potassium silicate zinc-rich coatings was prepared by organic-inorganic hybridization, which was manufactured by mixing zinc powder into modified potassium silicate solution with a ratio of 1:2.6. In this paper, we investigated the influence of modulus, solid content and the addition of moderately hydrolyzed silica-acrylic emulsion on the properties of waterborne inorganic zinc-rich coatings. The mechanism of silica-acrylic emulsion on water-based inorganic zinc-rich coatings was also discussed. The results indicated that when the modulus of potassium silicate was 3.3, the addition of moderately hydrolyzed silicone-acrylic emulsion was 5% ~ 10%, the film’s hardness, flexibility and adhesion were 5H, 4mm and grade 1, respectively, there is no significant change that the film has been immersed in water and 5% sodium chloride solution over 7 days, the coatings showed the best comprehensive performance.