The Usage Of Titanium Dioxide In Coatings

The Usage Of Titanium Dioxide In Coatings

The use of titanium white can greatly reduce the amount of pigment in the entire coating, and the resulting coating is colorful, not easy to yellow, light resistance, heat resistance, wear resistance, weather resistance, alkali resistance, sulfur resistance, dilute acid resistance.
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 Paint is a viscous suspension composed of base materials, pigments, fillers, solvents and additives. It is coated on the surface of the object to form a tough coating film, which plays a role in decoration and protection of the object.

   The pigment in the paint has a certain hiding power, it can not only cover the original color of the object to be coated, but also give the coating film a bright color to achieve the effect of beauty and decoration. At the same time, the pigment and the fixing agent are tightly combined and integrated, which can enhance the mechanical strength and adhesion of the coating film, prevent cracks, and can increase the thickness of the coating film, prevent the penetration of ultraviolet rays and moisture, and improve the aging resistance of the coating film. Service life.

Regardless of solvent-based or water-based coatings, if titanium dioxide is used, its role is not only to cover and decorate, but also to improve the physical and chemical properties of the coating, enhance chemical stability, and even improve hiding power, decolorization power, and corrosion resistance. , Light resistance, weather resistance, enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent the penetration of ultraviolet rays and moisture, thereby delaying aging and extending the life of the paint film. At the same time, it can save materials and increase varieties.

   Among the pigments, white pigment is the most versatile. Both white paint and light-colored paint are used in it. Therefore, in the production of paint, the amount of white pigment is much more than other pigments. The white pigments commonly used in coatings are zinc white, zinc barium white, titanium white, etc. Since some synthetic resin coatings have a relatively high degree of polymerization, if zinc white is added, zinc white is alkaline and has a tendency to thicken due to the acid-proof effect of free fat in the coating; if zinc white is added, weather resistance is poor. However, the use of titanium dioxide can improve the above shortcomings. Because the titanium dioxide particles are small and uniform, with high photochemical stability, in terms of hiding power, rutile titanium dioxide is 7 times that of zinc white, 5.56 times that of zinc barium white, and anatase titanium white is 5.57 times that of zinc white. 4.3 times of zinc-barium white; in terms of achromatic power, rutile titanium white is 8.3 times that of zinc white, 6.25 times that of zinc-barium white, anatase titanium white is 6.4 times that of zinc white, and 4.8 is zinc-barium white Times. In terms of use effect, 1t titanium white is at least equivalent to 4t zinc-barium white; in terms of service life (referring to outdoor powder resistance), the coating using titanium white as a pigment is 3 times higher than that of zinc-barium white. Therefore, the use of titanium white can greatly reduce the amount of pigment in the entire coating, and the resulting coating is colorful, not easy to yellow, light resistance, heat resistance, wear resistance, weather resistance, alkali resistance, sulfur resistance, dilute acid resistance. It is precisely because titanium white has more superior performance than zinc white and zinc barium white that it has become the best white pigment indispensable in the production of paint. The amount of titanium white accounts for more than 90% of the total pigments used in coatings and more than 95% of the white pigments used in coatings. It accounts for 10% to 25% of the coating raw material cost.


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