TiO_(2)的表面改性及其粉体流动性能评价方法的建立  

Surface Modification and Establishment of Powder Flowability Evaluation Method of TiO_(2)

作　　者：陈佳琦 陈建立 张玉荣 王永珊 刘廷福 陈葵[1] CHEN Jia-qi;CHEN Jian-li;ZHANG Yu-rong;WANG Yong-shan;LIU Ting-fu;CHEN Kui(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Longbai Group Co.,Ltd.,Henan Jiaozuo 454191,China;Anton Paar(Shanghai)Trading Co.,Ltd.,Shanghai 201103,China)

机构地区：[1]华东理工大学化工学院,上海200237 [2]龙佰集团股份有限公司,河南焦作454191 [3]安东帕(上海)商贸有限公司,上海201103

出　　处：《表面技术》2023年第7期325-335,共11页Surface Technology

摘　　要：目的建立基于粉体流动性能和颜料性能的TiO_(2)综合性能评判方法,指导表面改性工艺的优化,获得兼具优异的流动性能与颜料性能的钛白粉产品。方法以氯化法金红石型TiO_(2)为基料,依次进行Zr/Al无机包覆和有机包覆,研究包覆关键参数对TiO_(2)产品的流动性与颜料性能的影响。采用粉体流变仪进行TiO_(2)粉体的压缩性、壁摩擦、剪切作用测试,得到Hausner比、壁摩擦角、内摩擦角等表征流动性的特征指标参数;采用X射线荧光衍射仪测定钛白粉的无机元素含量;利用X射线衍射分析仪测定钛白粉基料的晶型;采用激光粒度仪测定粉体的粒度及粒度分布;通过扫描电子显微镜对粉体的表面形貌进行分析;通过光泽、消色力、遮盖率等指标评价钛白粉的颜料性能。以主成分分析法综合上述特征参数评判TiO_(2)综合性能。结果对于Zr/Al无机包覆,当铝的添加量为2.0%~3.0%时,粉体具有较优的颜料性能和流动性能。对于有机包覆,当TMP添加量为0.4%或TME添加量为0.2%时,所得产品在保持良好颜料性能的同时具有较优的流动性能,且生产成本相对较低。结论对于同一基料的钛白粉(D50=0.354μm),Zr/Al无机包覆中铝的添加量、有机包覆剂的种类及添加量均会对其表面性质产生影响,从而造成流动性和颜料性能的差异。以本文选择的特征指标,通过主成分分析法建立的TiO_(2)粉体综合性能评判方法,能够用于指导包覆工艺的优化。The flowability of TiO_(2)powder directly affects its pigment properties and application in subsequent fields.Currently,most of TiO_(2)products have the problem of poor flowability,which is manifested as bonding and agglomeration in blanking,packaging,transportation and subsequent application.The existing research on the flowability of powder mainly focuses on the flowability difference caused by particle size of micron powder such as food,medicine and pulverized coal,while there is little research on the flowability of submicron powder.To date,the research on the flowability of TiO_(2)powder has not been reported by scholars in China or abroad.The work aims to establish a comprehensive performance evaluation method of TiO_(2)based on powder flowability and pigment properties to guide the optimization of surface modification process and obtain titanium dioxide products with excellent flowability and pigment properties.The effects of the impact different surface properties on TiO_(2)flowability and pigment properties were compared with those on TiO_(2)of the same particle size and size distribution.With chloride rutile TiO_(2)as the base material,Zr/Al inorganic coating and organic coating were carried out in sequence.The effects of key coating parameters on the flowability and pigment properties of coated TiO_(2)products were investigated.By changing the alumina content(1.0%,2.0%,3.0%,4.0%,5.0%in terms of TiO_(2)mass)in Zr/Al inorganic coating,and maintaining the same organic coating conditions,the effect of inorganic coating on powder performance was explored.After the optimal inorganic coating was determined,the effect of organic coating on TiO_(2)powder performance was explored by maintaining the same inorganic coating condition and coating TiO_(2)samples with different additions of TMP and TME(0.0%,0.2%,0.4%,0.6%,0.8%,1.0%based on the mass of TiO_(2)).The compressibility,wall friction and shear action of TiO_(2)powder were tested by powder rheometer,and characteristic index parameters such as Hausner ratio,wa

关 键 词：二氧化钛 粉体流动性 表面改性 颜料性能 主成分分析 

分 类 号：TQ628.1[化学工程—精细化工]