Preparation of ground calcium carbonate-based TiO2 pigment by a two-step coating method
Preparation of ground calcium carbonate-based TiO2 pigment by a two-step coating method
复制标题
两步包覆法制备重质碳酸钙基TiO2颜料
DOI：
10.1016/j.powtec.2017.11.040
复制
发表时间：
2018-02-01
影响因子：
5.2
通讯作者：
Qi, Tao
中科院分区：
文献类型：
--
作者：
Chen, Yanru;Yu, Haijun;Qi, Tao
本文提出并研究了一种两步包覆法制备碳酸钙基纳米二氧化钛颜料（GOD）。选择四乙氧基硅烷（TEOS，C8H20O4Si）作为Si源。在第一涂覆步骤中使用氨水作为沉淀剂，而在第二步骤中使用硫酸氧钛（TiOSO 4中心点2H（2）O）作为Ti源。能量色散谱仪（EDS）和X射线荧光光谱仪（XRF）结果表明，二氧化硅成功地包覆在重质碳酸钙（GCC）颗粒表面。X射线衍射（XRD）和透射电子显微镜（TEM）结果表明，包覆后的SiO2为非晶态。EDS、XRD、TEM和SEM分析结果表明，SiO2包覆GCC（SiO2@GCC）表面包覆了TiO2，且TiO2颗粒由金红石和金红石的混晶组成。所得GOD的遮盖力与普通复合TiO_2颜料（LID）相比有显著提高，接近纳米TiO_2（ATD）的遮盖力。与CTD和ATD相比，这款GOD的白度和亮度略有下降。其吸油值略高于ATD，但低于CTD。(C)2017爱思唯尔B.V.保留所有权利。
A two-step coating method for preparing ground calcium carbonate-based TiO2 pigment (GOD) was proposed and studied in this paper. The tetraethoxysilane (TEOS, C8H20O4Si) was selected as Si source. Aqueous ammonia was used as precipitant in the first coating step while titanyl sulfate (TiOSO4 center dot 2H(2)O) was used as Ti source in the second step. The Energy dispersive spectrometer (EDS) and X-ray fluorescence (XRF) results prove that SiO2 is coated on the surface of ground calcium carbonate (GCC) particles successfully. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) results demonstrate that the coated SiO2 is in the form of amorphous. The EDS, XRD, TEM and Scanning electron microscope (SEM) results show that TiO2 is coated on the surface of SiO2 coated GCC (SiO2@GCC) and TiO2 particles are composed of mixed crystal of anatase and rutile. The hiding power of obtained GOD is significantly improved compared with ordinary composite TiO2 pigment (LID) and close to that of anatase TiO2 (ATD). The whiteness and lightness of this GOD are just slightly decreased compared to that of CTD and ATD. Nevertheless, its oil absorption-value is some higher than that of ATD but lower than that of CTD. (C) 2017 Elsevier B.V. All rights reserved.