A kind of preparation method of conductive titanium dioxide powder

Abstract

A method for preparing conductive titanium dioxide powder, the preparation process of which is as follows: 1) adding rutile titanium dioxide into distilled water for beating to form a slurry with a titanium dioxide mass concentration of 20% to 30%, stirring evenly to obtain the titanium dioxide slurry, and then feeding Add the zirconium salt solution dropwise to the titanium dioxide slurry to obtain a mixed solution A; 2) raise the temperature of the mixed solution A to 60-80° C.; 3) add a certain amount of mixed acidic solution of tin salt and antimony salt to the mixed solution In solution A, add lye at the same time to control the pH value from 1 to 3, and the addition time is 3 to 5 hours to obtain a yellow suspension; 4) ripen, wash, and dry the suspension, crush it to 280 to 300 nm, and then After calcination treatment, the conductive titanium dioxide powder can be obtained. The conductive titanium dioxide prepared by this method has excellent properties such as electrical conductivity, whiteness, hiding power, weather resistance and gloss when applied in coatings, plastics, fibers and other application fields, and is a new material with broad application prospects.

Description

technical field [0001] The invention relates to a preparation method of conductive titanium dioxide powder. Background technique [0002] Antimony doped tin oxide (ATO for short) is an n-type semiconductor material. dispersion , resistance to activity, Thermoplastic , wear resistance , There are other conductive materials (such as graphite , surfactants, metal powders, etc.) have incomparable advantages. Its powder has excellent electrical conductivity, and its loose density is smaller than that of metal powder. It is stably dispersed in the matrix material and is not easy to aggregate and settle. There will be no decrease in electrical conductivity due to the oxidation of metal powder. Coatings, conductive plastics, infrared absorbing materials and some antistatic materials have broad application prospects, and are a multifunctional material with great development potential. However, the ATO powder after high-temperature sintering is blue-green powder, and my countr...

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Problems solved by technology

[0004] Antimony-doped tin dioxide has excellent electrical conductivity, but the whiteness of the powder is very low, which seriously affects its application range

EP0267535 discloses a method for preparing conductive titanium dioxide, which uses a certain proportion of titanium dioxide and sodium chloride, sodium hydrogen phosphate, zinc oxide, potassium oxide or phosphorus pentoxide to treat it for a period of time at a high temperature of 900 ° C, and then After alkali treatment, acid treatment, and then surface coating, this method has many steps, and the calcining step consumes too much energy and consumes a lot of equipment.

CN102583524A discloses a preparation method of conductive powder coated titanium dioxide with tin oxide containing antimony oxide. The method first uses titanium salt as a titanium source to prepare titanium dioxide, then adds hydrolyzable tin salt and antimony salt, and deposits under controlled conditions Coated, finally dried and calcined, this method has too many steps, and the method of preparing titanium dioxide is not repeatable

CN103985430A discloses a method for preparing conductive titanium dioxide. In this method, a conductive layer of doped tin oxide is evenly deposited on the surface of titanium dioxide particles, but the concentration of the titanium dioxide suspension prepared by this method is as low as 10-20%. High cost per unit mass product

The conductive titanium dioxide prepared by the above method has a common defect, that is, the weather resistance and gloss of the product are not as good as the usual pigment grade titanium dioxide in the fields of coatings, plastics and fibers.

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