Yuan Lei's Little Knowledge | Application Range of Barium Sulfate in Coatings
Many performance indicators of barium sulfate (such as specific gravity, whiteness, oil absorption, refractive index, particle size, etc.) are close to titanium white, and have good dispersion and suitable particle size distribution. In order to make titanium dioxide effectively play its covering performance, adding an appropriate amount of barium sulfate in titanium dioxide can control the distance between titanium dioxide particles, prevent the occurrence of optical flocculation phenomenon, so as to reduce the amount of titanium dioxide without affecting the hiding power of the product, and the gloss of the finished product, weather resistance, acid and alkali resistance and other indicators have been improved.
(1) Application in primer
Barium sulfate has a large specific surface area and a better particle size distribution range. It can be applied to the primer with less binder to make the product have better application and rheology. Used for automotive primer, even if you add more barium sulfate can get a smooth and dense coating.
(2) Application in topcoat
Barium sulfate is an inert filler, good weather resistance, used as a filler for topcoat, even if exposed to the environment, can play a long-term protective effect. Because the product has the characteristics of good gloss and small particle size, it can improve the fluidity, surface smoothness, hardness and color stability of the paint.
(3) application in emulsion paint
Due to the excellent properties of barium sulfate, it can be used in high gloss and mercerized texture paints and "acid-proof" emulsion paints. The paint can also play a role in corrosion protection even when exposed to the atmosphere of industrial areas.
(4) in wood, decorative paint application
Barium sulfate has the characteristics of small particle size and low absorption light, especially suitable for the surface paint, varnish and natural lacquer liquid body filler for wood decoration. The products are used for wood decoration, with good gloss, chemical corrosion resistance and weather resistance.
(5) Application in powder coatings
Barium sulfate has the characteristics of large filling amount, good brightness, good leveling, strong light retention and good compatibility with all pigments. It is the most ideal filler for powder coatings.
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Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.