研究硬脂酸、铝酸酯、钛酸酯对滑石粉的改性效果,以活化指数和接触角作为表征指标,得到滑石粉的较好的改性工艺参数:硬脂酸、钛酸酯、铝酸酯的用量分别为3%、2.5%、3%,改性时间为1.5 h,改性温度为65 ℃.分别利用粒度分析和扫描电镜观察改性前后滑石粉的粒度和形貌,发现改性滑石粉粒径减小,分散性提高.放置42 d后,未添加滑石粉的尿素和复合肥的结块率分别为26.79%和12.96%,结块强度分别为868.38 N/kg和1974.11 N/kg;添加3%钛酸酯改性的滑石粉作为防结块剂时,尿素和复合肥的结块率分别0.59%和0.46%,结块强度分别为30 N/kg和40 N/kg.
The talc powder was modified by using stearic acid, aluminate and titanate, though activation index and contact angle as characterization index, the good surface modification technology were stearic acid, titanate, aluminate content of 3%,2.5%,3%, reaction time of 1.5 h and reaction temperature of 65 ℃.The particle size and topography of modified talc powder and unmodified talc powder were investigated by particle size analysis and scanning electron microscopy, the particle size of the modified talc powder was decreased, and the dispersion was improved.After leaving along for 42 d, the caking rate of carbamide and compound fertilizer without talc powder was 26.79% and 12.96%, and the caking strength was 868.38 N/kg and 1974.11 N/kg.When 3% titanate modified talc power was added as anti-blocking agent, the caking rate of carbamide and compound fertilizer was 0.59% and 0.46%, and the caking strength was 30 N/kg and 40 N/kg.
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