Four functions of ultrafine barium sulfate in coatings
Ultrafine barium sulfate has fine particle size and narrow particle size distribution. The average particle size of primary particles is in the range of 0.01-0.08 micron, and the particle size distribution is very narrow, with primary particles below 0.1 micron accounting for 90% and even more than 96%. Applied in the coating industry, generally has the following characteristics or functions:
1, can improve the physical properties of the coating. The coating base material added with ultrafine barium sulfate shows a non-Newtonian viscosity, thus improving the fluidity of the coating, preventing flow resistance, preventing precipitation, and giving the film a good fullness.
2, good dispersion in the coating base material. In the coating base material, under the usual dispersing conditions of pigment, the dispersion is good. Therefore, the coating film formed with the addition of such pigment will not be whitened by light scattering of barium sulfate.
3, disperse in the resin liquid with transparency. Visible light is known to have a wavelength of 380-780 nanometers, and if the particle size is less than 0.19 microns, which is less than half the wavelength of visible light, light can pass through this particle. The average particle size of this ultrafine barium sulfate is 0.01~0.08 micron, and the particle size distribution is very narrow. So essentially, all the particle sizes of this barium sulfate are below half the wavelength of visible light. Therefore, its disposable particles dispersed in the resin liquid, with transparency, even if a large number of use, can also get good transparency of the film.
4, with organic coloring pigments with dispersing additives. Organic pigmented pigment, widely used as a strong pigment in coatings. However, the dispersion of this pigment in the base material is not very good, and then to the light scattering of barium sulfate, and cause the film flooding, so can not get bright color thick film. The ultra-fine barium sulfate is different, not only has transparency and excellent dispersion, but also as an organic pigment dispersant, so its application in paint, compared with the past, can get bright color with gloss thick film.
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