掺杂锡云母钛珠光颜料的制备及光学性能探讨

Preparation of titanium-mica pearlescent pigment doped with tinny-oxides and discussion on optical poperties thereof

为了获得高耐候性、耐热性、光泽度的云母钛珠光颜料,以不同锡盐和四氯化钛混合溶液作为沉积剂,采用化学液相沉积法,通过改变锡盐的类型、掺杂量等工艺参数制备出不同金红石晶型比例的云母钛珠光颜料。分别采用X射线衍射(XRD)、扫描电镜(SEM)和测色仪对获得的云母钛珠光颜料进行晶型、形貌和反射率的表征。结果表明:2价锡(Sn2+)不能促使云母钛向金红石型转化,而4价锡(Sn4+)是一种良好的金红石型云母钛珠光颜料导晶剂,其最佳掺杂量为10%(物质的量分数),最佳煅烧温度为800℃。在该条件下制备的二氧化钛产品金红石型比率达到93%,经扫描电镜观察发现,产品表面平整光滑,反射率测试结果证明其光学性能最佳。

In order to get the titanium-mica pearlescent pigment with excellent weather resistance,good heat resistance,and high luster,chemical liquid deposition method was adopted to prepare titanium-mica pearlescent pigments with different proportions of rutile titanium dioxide.During the preparation,different mixtures of titanium tetrachloride with tinny-salts were used as precipitants,and the process parameters,such as types of tinny salt and doping amount etc.,were investigated.Crystal forms,morphologies,and reflectivities of products were characterized by XRD,SEM,and color measurement instrument respectively.Results indicated that stannous（Sn2＋）cannot promote the A-R（anatase-rutile） phase transformation of titanium-mica,while stannic（Sn4＋） was a good crystal agent,whose optimum doping quantity was 10%（amount-of-substance fraction）,and optimum calcination temperature was 800 ℃.Product with 93% A-R phase transformation of TiO2 was prepared under the foregoing conditions,and the product surface was smooth from SEM result.The reflectivity test indicated that optical properties of the product were also the best.