包覆型铝粉颜料在水性涂料中的应用

Application of encapsulated aluminum pigments to waterborne coating

以正硅酸乙酯(TEOS)和乙烯基三乙氧基硅烷(VTES)为前驱物,通过溶胶–凝胶反应在铝颜料表面形成了一层致密的包覆层,再通过甲基丙烯酸甲酯(MMA)和丙烯酸(AA)的自由基聚合反应对铝颜料进行第二层包覆,制备了含亲水基团的包覆型铝粉颜料,以此包覆的铝颜料配制了水性铝粉涂料。研究了铝粉及交联剂的用量、涂料黏度和烘烤温度对漆膜外观和性能的影响,获得了较佳的工艺条件如下:铝粉用量为3%,交联剂的用量为树脂用量的30%,涂料黏度为13s,烘烤温度为150°C。以此工艺获得的水性铝粉涂料涂膜具有较佳的综合性能,光泽度达到73.4°。

An encapsulated aluminum pigment containing hydrophilic-group was prepared by producing dense encapsulation layer on the surface of aluminum pigment, which is formed with tetraethoxysilane （TEOS） and vinyltriethoxysilane （VTES） as precursors by sol-gel reaction, and by encapsulating the second layer formed by free radical copolymerization reaction of methyl methacrylate （MMA） and acrylic acid （AA）. A waterborne aluminum coating was prepared with the encapsulated aluminum pigment. The effects of the amounts of aluminum pigment and crosslinking agent, viscosity of the coating material and baking temperature on film appearance and performance were studied. Good process conditions were obtained as follows： amount of aluminum pigment 3%, amount of crosslinking agent 30% compared with resin, viscosity 13 s, and baking temperature 150℃. The film of waterborne aluminum powder coating obtained from this process has excellent comprehensive performance and its luster is up to 73.4°.