Method for producing special rutile type titanium white powder for power coating

Abstract

The invention discloses a method for producing special rutile type titanium white powder for power coating, which comprises the following steps of: preparing slurry of which titanium dioxide concentration is 300 to 400g / l by using bleached metatitanic acid, and adding a calcining auxiliary agent into the slurry; filtering the obtained metatitanic acid, then calcining solid, and grinding the solidto obtain a primary product; preparing titanium dioxide slurry of which titanium dioxide concentration is 650 to 850g / l by using the obtained primary product, adding a wetting agent into the titaniumdioxide slurry, and performing dispersion and grinding; heating the obtained titanium dioxide slurry to between 40 and 90 DEG C, adding dispersant, zircon salt or titanium salt, silicon salt and aluminum salt into the slurry in turn, adjusting the pH value to between 5 and 9, ageing the mixture, and adjusting the pH value to between 7 and 8; and then filtering, washing and drying the mixture, treating the dried product by an organic surface treatment agent, and vaporizing the product to obtain the rutile type titanium white powder. Compared with the prior art, the rutile type titanium white powder obtained by the method has the properties of stable crystal lattice, good dispersion, heat and yellowing resistance, and good oily whiteness, reducing power, covering power and weather resistance and the like; the appearance and properties of the rutile type titanium white powder are close to that of the rutile type titanium white powder prepared by a chlorination process; and the productionmethod has the advantages of easily obtained process raw materials and stable process control.

Description

technical field [0001] The invention belongs to the field of chemical production, and specifically relates to a method for producing rutile-type titanium dioxide special for powder coatings. Background technique [0002] During the production and use of coatings, a large amount of VOC (Volatile Organic Compounds) has attracted great attention from relevant state departments and the general public. appear. In the future, environmentally friendly coatings including water-based coatings and powder coatings will gradually replace traditional solvent-based coatings and become the leading products in the market. The environmental protection, energy saving and economic performance of powder coatings will continue to be recognized and accepted by people, and will eventually become the first choice of coatings in industrial, civil, construction and other fields. [0003] At present, there is no prior art of special rutile titanium dioxide for powder coatings. The titanium dioxide u...

AI Technical Summary

Problems solved by technology

[0005] In the Chinese invention patent with the application number CN20061004366.4, the "processing technology of titanium dioxide with high application performance" is disclosed. The products disclosed in this invention are general-purpose products, reflecting To ensure the dispersibility of the product, it still does not involve heat yellowing resistance, which is a necessary technical requirement for powder coatings

[0006] In addition, in the Chinese invention patent application number 200610020847.1, the "production method of high weather resistance titanium dioxide pigment" is disclosed, which discloses a high weather resistance product The production method, the product is not involved in the use of special powder coatings, and there is no improvement in the heat yellowing resistance of the product