Abstract: The application ofSiO₂-TiO₂ composite pigment in building coating was investigated in order to improve the application level of this pigment and to reduce the coating cost. The coatings based on the SiO₂-TiO₂ composite pigment were prepared, and the effect of coatings viscosity, film contrast ratio and UV exposure on color difference was investigated, meanwhile, the performance was compared with that of coatings based on rutile TiO2. It was revealed that the contrast ratio of coatings based on SiO₂-TiO₂ was higher than that of the coating based on rutile TiO₂ when the dosage of pigment was the same(e.g., 150 and 20% respectively )while the two coatings gave the similar contrast ratio when the dosage of pigment was 5% and 10% respectively. After exposure to UV for 600 hours, the color difference of the coatings based on 15% SiO₂-TiO₂ was lower than that of the coatings based on 15% TiO₂,whereas, the two coatings gave the similar color difference when the dosage of pigment was 10%o respectively. The anti-UV performance of the coating based on SiO₂-TiO₂ was in accordance with the properties of pigment such as UV absorption and reflectivity, indicating that both ofSiO₂-TiO₂ and TiO₂ pigment had similar hiding power and anti-UV performance.

Key words: SiO₂-TiO₂ composite pigment coating, apply, contrast ratio, anti-UV

摘要： 基于提SiO₂-TiO₂复合颜料应用水平和降低涂料成本的目的,对SiO₂-TiO₂复合颜料在建筑涂料中的应用进行了研究。测试分析了添加SiO₂-TiO₂复合颜料所制备涂料的黏度、涂膜对比率和紫外线照射对涂膜色差的影响,并与添加金红石型钛白粉的涂料进行了对比。结果显示:添加SiO₂-TiO₂复合颜料与添加同比例钛白粉的涂料相比,添加15%和20%（质量分数,下同）的SiO₂-TiO₂复合颜料的涂料对比率大于添加同比例钛白粉的涂料,添加量均为5%和10%时涂料的对比率接近;涂膜经紫外线在600 h以内照射,添加15% SiO₂-TiO₂复合颜料时涂料的△E*_ab比添加同比例钛白粉涂料的小,添加量均为10%时涂料的△E*_ab相当; SiO₂-TiO₂复合颜料在涂料中表现出的抗紫外老化性能与其对紫外线的吸收和反射行为一致。结果表明SiO₂-TiO₂复合颜料与金红石型钛白粉具有相当的遮盖能力和抗紫外老化性能。

关键词: SiO₂-TiO₂复合颜料, 涂料, 应用, 对比率, 抗紫外老化