一种有机硅分段改性多功能硅丙外墙涂料及其制备方法

Organosilicon staged-modified multifunctional silicone-acrylic exterior wall paint and preparation method thereof

Abstract

本发明涉及一种有机硅分段改性多功能硅丙外墙涂料及其制备方法,解决了硅丙涂料性能不够稳定、价格偏高的问题。本发明采用丙烯酸丁脂、甲级丙烯酸甲脂、甲级丙烯酸、有机硅和有机硅氧烷单体及去离子水聚合反应制得改性硅丙乳液;采用羟基硅油改性填料硅灰石粉和滑石粉以及疏水增效剂微晶腊,再与钛白粉、去离子水等混合反应制得改性复合中间乳液;将改性硅丙乳液、改性复合中间乳液与成膜助剂等混合反应制得成品。本发明通过对丙烯酸乳液、填料、疏水增效剂微晶腊进行有机硅分段改性、分步制备,增强并固化了中间体和成品涂料性能。该涂料具有突出的耐候性和耐沾污性,并具备弹性和环保性,比市面硅丙涂料降低造价20%,有利大面积推广使用。
The invention relates to an organosilicon staged-modified multifunctional silicone-acrylic exterior wall paint and a preparation method thereof. With the paint and the method, problems of poor performance stability and high price of silicone-acrylic paints are solved. According to the invention, modified silicone-acrylic emulsion is prepared through a polymerization reaction of butyl acrylate, methyl methacrylate, methacrylic acid, organosilicon and organosiloxane monomers, and deionized water; hydroxyl silicone oil is used for modifying filling materials of wollastonite and talc powder, and a hydrophobic synergist microcrystalline wax; the materials are mixed and are subjected to a reaction with titanium dioxide, deionized water, and the like, such that a modified composite intermediate emulsion is prepared; and the modified silicone-acrylic emulsion, the modified composite intermediate emulsion, and a film-forming auxiliary agent are mixed and are subjected to a reaction, such that a finished product is prepared. According to the invention, acrylic emulsion, the filling materials, and the hydrophobic synergist microcrystalline wax are subjected to organosilicon staged modification and stepped preparation, such that intermediate and finished product paint performances are enhanced and reinforced. The paint has outstanding weatherability, outstanding stain resistance, elasticity, and environment-friendliness. The cost of the paint is reduced by 20% than silicone-acrylic paints in markets. Therefore, the paint can be popularized.

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