Preparation of Bismuth Oxychloride as Pearlescent Pigment
Bismuth oxychloride crystals were prepared from bismuth nitrate by hydrolysis method without adding any Surfactant or adding alkali to adjust the pH of the reaction system.The effects of reaction temperature,agitation speed,reaction time and acid concentration on bismuth oxychloride crystals were investigated.On the basis of single factor experiment,taking the average particle size of bismuth oxychloride as the response value,using Design Expert software,according to Box-Behnken's central combined experiment design principle,the reaction temperature,agitation speed and reaction time were selected as independent variables to carry out response surface analysis and design,and the preparation process of bismuth oxychloride pearlescent pigment was optimized.The results show that the order of influence on the average particle size of bismuth oxychloride is stirring speed＞reaction time＞reaction temperature,the optimum preparation conditions of bismuth oxychloride pearlescent pigment were as follows:reaction temperature 90 ℃,reaction time 1 h,agitation speed 480 r/min,hydrochloric acid concentration 0.2 mol/L,the average particle size of bismuth oxychloride was 18.92 pm.
万方数据
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