超重力反应结晶法纳米碳酸钙浆料及粉料的表面处理  

Study on the surface modification of slurry and powder of nano-CaCO_3synthesized by supergravity reaction-crystallization method

作　　者：章正熙[1] 华幼卿[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《聚氯乙烯》2003年第3期28-32,共5页Polyvinyl Chloride

基　　金：中石化基础研究基金资助项目(500007)

摘　　要：研究了脂肪酸盐A、水溶性钛酸酯偶联剂B(B1)以及钛酸酯偶联剂C对新型超重力反应结晶法所得的纳米CaCO3浆料及粉料的湿法表面处理的配方与工艺,确定了A体系的最佳改性时间为30～40min、改性温度为40～50℃、改性剂用量(质量分数)为3%～5%;B(B1)体系搅拌强度必须很高,改性时间30～40min,改性温度80℃左右,改性剂用量(质量分数)3%～5%;C体系的最佳改性时间为30～40min,改性剂用量(质量分数)为3%～5%。同时,采用红外光谱对改性前后的纳米碳酸钙进行了表征,表明改性剂已连接至CaCO3表面。最后,用分散稳定模型简要分析了改性机理。The formula and process for the wet surface treatment of nano-CaCO3 slurry and powder,which was synthesized by a novel supergravity reaction-crystallization method,using fatty acid salt A,water-soluble titanate coupling agent B(B1) and titanate coupling agent C were studied.The optimal conditions were obtained,which were as follows:for system A,time was 30～40 min,temperature was 40～50 ℃ and modifying agent dosage was about 3wt%～5wt%;for system B(B1),time 30～40 min,temperature about 80 ℃,modifying agent dosage about 3wt%～5wt%,and the agitation strength must be high;for system C,time 30～40 min and modifying agent dosage 3wt%～5wt%.Meanwhile,IR was used to character the unmodified and the modified nano-CaCO3,and the results showed that the modifying agent had attached to the surface of CaCO3.Finally,the modification mechanism was discussed briefly by using dispersion stability model.

关 键 词：超重力反应结晶法 碳酸钙 浆料 粉料 表面处理 脂肪酸盐 铁酸酯偶联剂 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]