新闻资讯
Modification of superfine iron oxide red pigment powder
2022-09-27
Powders, especially ultra-fine powders, are widely used because of their small particles, large specific surface area, high surface energy, high reactivity, strong ability to interact with other substances, and special effects on light and electricity. However, when they agglomerate with each other, especially when they form hard agglomeration, their reactivity will be significantly reduced, and the ultrafine effect and nanometer effect of particles will disappear, which will inevitably seriously affect their application performance, especially for ultrafine pigment powder. The dispersion degree of pigment particles will seriously affect the color, hiding power, coloring power, oil absorption and other application performance of pigments. Therefore, improving the dispersion of ultrafine powder is one of the main fields of powder engineering research in recent years, which has important theoretical significance and application value. Iron oxide pigment is an inorganic pigment whose production and sales volume are second only to titanium dioxide. It is also a kind of product in the production of inorganic color pigments, and is widely used in various fields. China is a major producer of iron oxide pigments in the world, and is the largest exporter of iron oxide pigments next only to Germany. However, compared with developed countries, China's iron oxide pigment industry is still relatively backward. Most of the iron oxide pigments produced are untreated primary products with low price and low added value. Therefore, it is necessary to change this situation and conduct post-treatment of iron oxide pigment to improve the quality and grade of the product.
Surface treatment technology is one of the most important development directions of iron oxide pigment post-treatment technology. It can improve the dispersion performance of the product, and then improve the service performance of the product. The proportion of iron oxide red in iron oxide pigments. Therefore, this paper studies the surface modification of superfine iron oxide red pigment. In this paper, the dry surface modification process is adopted, and the modification formula and process conditions of the surface modification treatment of superfine iron oxide red pigment are obtained through the comparison experiment of the varieties of modifiers and additives, the dosage experiment and the temperature experiment. That is, the modifier is D3008, and the dosage is 3.0%; The amount of modified additive silica is 4.0%; The temperature of modification experiment is 97~98 ℃. On this basis, ultrafine iron oxide red pigment with good dispersion was prepared. Compared with the original sample and similar samples from Bayer in Germany, the pigment after surface treatment has good dispersion stability in water, small bulk density and surface ζ High potential, good dispersion in aqueous solution and natural dry state.
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