摘要:
以低浓度工业硫酸钛液为原料,通过水解、洗涤、盐处理、煅烧工艺制备锐钛型颜料钛白,考查了高温段保温时间对钛白粒子结构及颜料性能的影响,并采用XRD、粒度测试、SEM及颜料性能检测对煅烧样品进行了表征。结果表明:煅烧条件对钛白粒子的晶体结构、晶粒尺寸、粒子大小及分布和颜料性能等影响显著,粒子大小维持在300 nm左右,随煅烧保温时间延长晶粒生长满足一级动力学生长模型。高温段930℃保温30 min为最佳条件,所制钛白形貌规整,粒度分布最窄,消色力指标达1 450,相对白度100.23%,优于PTA120标样。
Abstract:
Using low concentration industrial titanyl sulphate solution as raw material,anatase titania white pigment was prepared via the sulphate process of hydrolyzing,washing,salt treatment and calcination.And the effects of calcinations holding time at the highest temperature on structure and pigment properties were investigated.The as-prepared calcined samples were characterized by XRD,particle size distribution test,SEM and pigment properties test.Calcinations conditions had great influence on the crystal structure,grain size,particle size and its distribution,as well as pigment properties of the anatase white pigment.The average particle size of all the samples maintained about 300 nm,and crystal growth was consistent with first order kinetics of growth model.Keeping temperature at 930 ℃ for 30 min was the optimized calcination condition,and the prepared titanium white pigment was with regular morphology,the narrowest particle size distribution.The achromic ability index of the sample under optimized calcination condition was of 1 450,and relative whiteness index of 100.23%,higher than standard sample PTA120.
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