The role of pigment-grade titanium dioxide in coatings

Coatings are viscous suspensions consisting of substations, pigments, fillers, solvents and additives. It is coated on the surface of the object to form a tough coating film, the object plays a decorative and protective role.
paint in the coating has a certain cover force, it can not only cover the original color of the coating surface, but also give the coating film bright colors, to achieve the role of aesthetics and decoration . At the same time, pigments and fixants closely combined, integrated into one, can enhance the mechanical strength and adhesion of the coating film, prevent cracks, and can increase the thickness of the coating film, prevent ultraviolet and moisture penetration, improve the film aging resistance, extend the service life.
Whether solvent-based or water-based coatings, if the use of titanium dioxide, its role is not only to cover and decoration, the more important role is to improve the materialization performance of the coating, enhance chemical stability, so as to improve the cover, antichromic force, corrosion resistance, light resistance, weather resistance, enhance the mechanical strength and adhesion of the paint film, prevent cracks, prevent ultraviolet and moisture through, thereby delaying aging, prolonging the life of the paint film.
in pigments, white pigments are the most widely used, white paint and light paint are used in it, so in the production of coatings, white pigments use much more than other pigments. The white pigments commonly used in coatings are zinc white, zinc palladium white, titanium white and so on. Because some synthetic resin coating polymerization is large, if zinc white is added, it has a tendency to thicken due to zinc white, and the free fat anti-acid action in the coating; However, the use of titanium white can improve the above shortcomings, because titanium white particles small and uniform, high photochemical stability, in terms of covering force, the redstone type of titanium white is 7 times zinc white, is 5.56 times the zinc white, the sharp titanium type of titanium white is 5.57 times the zinc white, is In terms of color-reducing force, the goldstone titanium white is 8.3 times the zinc white, 6.25 times the zinc palladium white, and the sharp titanium white is 6.4 times the zinc white, and 4.8 times the zinc palladium white. In terms of use effect, 1t titanium white is equivalent to at least 4t zinc palladium white, in terms of service life (refers to outdoor powder resistance), the coating of titanium white as pigment is 3 times higher than the coating of zinc palladium white pigment.