铝包膜TiO_(2)的膜层结构对颜料性能的影响  

Effect of alumina-coated TiO_(2) film structure on its pigmentary properties

作　　者：周鑫 周春勇 刘不尽 纪利俊[1] 陈葵[1] ZHOU Xin;ZHOU Chunyong;LIU Bujin;JI Lijun;CHEN Kui(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Longbai Sichuan Titanium Industry Co.,Ltd.,Mianzhu 618200,Sichuan,China)

机构地区：[1]华东理工大学化工学院,上海200237 [2]龙佰四川钛股业有限公司,四川绵竹618200

出　　处：《精细化工》2022年第10期2149-2154,共6页Fine Chemicals

摘　　要：以偏铝酸钠为包膜剂,采用液相沉淀法在TiO_(2)粒子表面包覆氧化铝膜。采用TEM、SEM、XRF、比表面积分析仪表征了包膜TiO_(2)样品的膜层结构,通过测试其耐候性、光泽度、遮盖率评价了其颜料性能。以HRTEM结合晶格计算分析膜层水合氧化铝的晶型,并考察了包膜过程中pH和温度对包膜TiO_(2)的膜层结构和颜料性能的影响。结果表明,酸性条件下包膜Ti O_(2)的膜层水合氧化铝为无定形结构,产品耐候性较优;pH=10.0时,膜层水合氧化铝为勃姆石型和拜耳石型混合晶型,以勃姆石型为主,产品颜料性能优异;pH>11.0后,膜层水合氧化铝为拜耳石型,产品颜料性能较差。温度升高会增加膜层水合氧化铝的结晶度,从而提高包膜TiO_(2)产品的颜料性能。TiO_(2)particles coated with alumina film were prepared by liquid-phase precipitation method using sodium metaaluminate as coating agent, characterized by TEM, SEM, XRF and specific surface area analyzer, and evaluation of its pigmentary performance was conducted via weather resistance, gloss and coverage rate measurements. The crystalline forms of the alumina film was analyzed by HRTEM in combination with lattice calculation. Meanwhile, the effects of p H and temperature employed during coating process on the film structure and pigmentary properties of alumina-coated TiO_(2)obtained were investigated. It was found that the alumina-coated TiO_(2)prepared under acidic conditions exhibited good weather resistance with hydrated alumina film being amorphous, while the samples prepared at pH=10.0 displayed excellent pigmentary performance with hydrated alumina film being boehmite and bayerite, mainly boehmite. However, when pH>11.0, the hydrated alumina film was mainly bayerite resulting in poor pigmentary performance. Furthermore, coating temperature increment showed a positive influence on the crystallinity of the hydrated alumina film, thus leading to pigmentary performance improvement of TiO_(2)products.

关 键 词：二氧化钛 氧化铝膜 晶格间距 晶型 颜料性能 特种颜料 

分 类 号：TQ621.12[化学工程—精细化工] TQ133.1