摘要
氧化铁黄的耐热性能较差,177℃便开始脱水变色,因此在塑料和高温涂料行业的应用受到限制。通过水热法和沉淀法相结合的方式,在氧化铁黄表面包覆一层含铝物质,制备耐热型包覆氧化铁黄颜料,探讨水热处理时间、温度及pH值对包覆铁黄耐热性能的影响。得到了最佳反应条件如下:pH为8、180℃水热处理6h时,铁黄的耐热温度可达240℃,色差为2.58。同时分析了不同pH值条件下包覆铁黄耐热性能差异的原因,结果表明:主要是由包覆层形成物质不同引起,其中pH为4和6时,包覆层为钠明矾石和羟基氧化铝的混合物;pH为8和10时,包覆层为羟基氧化铝;与未包覆铁黄相比,包覆铁黄的耐热性能明显提升。
The application of iron oxide yellow in paints and plastics industries is restricted due to the poor heat resistance leading to water loss at 177 ℃. The heat-resistant iron oxide yellow was prepared by combined hydrothermal and precipitation methods to coat substances containing A1 on the surface of iron oxide yellow. The effects of hydrothermal reaction time, hydrothermal reaction temperature and pH value on the thermal properties of coated iron oxide yellow were investigated. The optimal reaction conditions obtained are reaction temperature of 180 ℃, reaction pH value of 8, hydrothermal processing time of 6 h, heat resistance of yellow iron oxides of 240 ℃, and color difference of 2.58. The results show that the different coating layers lead to different heat resistances of the samples. When the pH value is 4 or 6, the coating layer is natroalunite and aluminum oxyhydroxide mixture. While the pH value increases to 8 or 10, the surface of coating layer is aluminum oxyhydroxide. Based on the results by thermal analysis, the heat resistance property of coating iron oxide yellow is promoted, compared to that of ordinary pigment.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2016年第2期308-313,共6页
Journal of The Chinese Ceramic Society
基金
湖州市科技计划项目(2013GY05)
关键词
氧化铁黄
水热处理
包覆
耐热性能
iron oxide yellow
hydrothermal treatment
coated
heat resistance properties
作者简介
潘国祥（1981—），男，博士，副教授。
