The application status of titanium dioxide in coatings are reviewed

Coating is mainly composed of film-forming material, pigments, solvents and additives, such as four parts, the paint coating has certain covering power, it can not only cover the coated the color of the original object, and can give coating bright-coloured color, achieve beautification adornment effect of the surroundings. Together at the same time, the paint and curing agent and substrate integrated mechanical strength and adhesion, can enhance film to prevent cracking or peeling, and can enhance the thickness of the coating, prevent ultraviolet or moisture penetration, improve the anti-aging and durability of the coating, prolong the service life of coating and objects to be protected, and the amount of white pigment in the paint, the biggest performance requirements of the coating of white pigment good whiteness and wettability of grinding, good weatherability and good chemical stability, small size, high covering power and decoloring force, opacity and gloss.

Titanium pigment is a kind of white pigment, coating with most of its output accounts for more than 70% of inorganic pigments, consumption accounted for 95.5% of total white pigment consumption. Currently about 60% of the titanium dioxide used in the manufacture of all kinds of paint in the world, especially the rutile type titanium pigment, most consumed by coating industry.Made of titanium pigment coating, colorful, high covering capacity, tinting strength is strong, consumption province, many varieties, protection to the stability of the medium and the paint film mechanical strength and adhesion, to prevent crack, prevent ultraviolet (uv) and water through extend the life of the paint film, colorful coating in the design of almost every color cannot leave the titanium pigment, different USES for different kinds of coating of titanium dioxide have different requirements, such as powder coating requires good dispersion, rutile type titanium pigment and sharp titanium type titanium pigment decolorization ability strong photochemical activity, used in powder coating, coating prone to yellowing, rutile type titanium white by sulfuric acid method produced is moderate price, good dispersibility, strong tinting strength, high dosage of provinces, variety and protection to the stability of the medium, and the paint film mechanical strength and adhesion, to prevent the crack, prevent ultraviolet (uv) and water through the paint film is prolonged.

  Volatile substances in water-based coating refers to the coating formulation, for the most part is water paint, along with the people environmental protection consciousness enhancement and the increasingly strict environmental protection laws, has popularization and solvent paint, water-based coatings for titanium white white degree and dispersion, good covering power, decolorization and weathering high noise, low quality, and the content of titanium dioxide are on the market at present is common type titanium pigment, can be used for solvent paint, as well as good covering power and decoloring force again, very suitable for indoor powder coating. And outdoor powder coating with titanium dioxide in addition to the required dispersion, covering power and decoloring force outside also requires excellent weatherability. As a result, the outdoor powder coating with titanium dioxide is commonly general type titanium pigment, both can be used for solvent coating and can be used for water-based coating, but, after all, waterborne coatings and solvent-based coating is in essence the difference, the generic type of titanium pigment in the coating of the dispersion effect is not very good, therefore, in order to make the chain, can very good dispersion in water paint, should be targeted to choose white surface treatment.

  Architectural coatings for acid and alkali resistance, water resistance, moistureproof, whether rough or smooth surface at the grass-roots level shall be good adhesion. Used for building coating of titanium dioxide in addition to the requirement has the above mentioned good optical performance and pigment performance, the most important is the requirement of titanium dioxide with high weatherability, strong resistance to pulverization, especially the exterior architectural coatings.