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Study on silica coated chrome oxide green pigment and its performance
Author(s) -
Wang Zheng,
Bao Chunyan,
Yan Ke,
Song Yufeng,
Li Wangting
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50281
Subject(s) - materials science , scanning electron microscope , chemical engineering , coating , oxide , chromium , sodium silicate , composite number , particle size , iron oxide , composite material , metallurgy , engineering
In this study, sodium silicate (Na 2 SiO 3 ) was used as the precursor of SiO 2 to prepare Cr 2 O 3 /SiO 2 composite pigments. First, using cetyltrimethylammonium bromide to surface modification of the chromium oxide green pigment to make the surface of the particles positively charged. The negatively charged SiO 2 sol coats the surface of the pigment particles through electrostatic attraction. Then use HCl solution acid to precipitate SiO 2 , and finally get Cr 2 O 3 /SiO 2 composite pigment. The structure of the modified pigment was analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle size distribution analysis, and X‐ray diffraction (XRD) characterization. The influence of silica coating on the tinting strength, dispersibility of pigment in water, and hiding power of the chromium oxide green pigment were further investigated. The results demonstrate that SEM, TEM, and particle size analysis shows that this experimental method can obtain a good silica coating. When the coating quantity is 30%, the full coating of chromium oxide green by silica is achieved. According to the XRD analysis before and after the chromium oxide green coating, as the reaction temperature increases, the intensity of the SiO 2 diffraction peak becomes larger and the crystallization effect becomes better. In the test of pigment performance, it can be concluded that the coloring power, hiding power, and dispersibility of Cr 2 O 3 /SiO 2 composite pigments are better than those of uncoated chromium oxide green pigments.