Preparation method of titanium dioxide conductive powder

Abstract

The invention provides a preparation method of titanium dioxide conductive powder. The method comprises the following steps: taking rutile titanium dioxide, adding a proper amount of deionized water and a proper amount of small medium balls, adding a tin salt, an antimony salt and niobium pentoxide in proportion while stirring, adding a reducing agent (zinc or magnesium or iron or a mixture of zinc, magnesium and iron), carrying out a reaction for 40-180 min after the addition of the reducing agent ends, adjusting the pH value of the obtained solution to 2-4 by using ammonia water, separating the adjusted solution through a centrifuge or a suction filtering device to obtain a wet precursor, and washing the wet precursor with deionized water with the volume 3-5 times the volume of the wet precursor 2 times; and drying the washed wet precursor at 130-180 DEG C for 6-13 h, calcining the dried precursor at 520-580 DEG C for 2.5-5.5 h, and crushing the calcined precursor through a jet mill to obtain the titanium dioxide conductive powder.

Description

technical field [0001] The invention belongs to the field of preparation of functional materials, in particular to a preparation method of titanium dioxide conductive powder. Background technique [0002] Titanium dioxide (commonly known as titanium dioxide) is a material with the best hiding rate among white pigments, and its band gap energy E g It is 3.2ev, equivalent to the wavelength of ultraviolet light, and can undergo electronic transition under the irradiation of ultraviolet light, so it can absorb ultraviolet light and is non-conductive at room temperature and visible light. After coating titanium dioxide and converting it into a semiconductor, you can obtain " Titanium dioxide conductive powder". The basic properties of titanium dioxide conductive powder are: not only has electrical conductivity, but also has chemical stability that metals and other materials do not have, and has antistatic, lightning protection, anti-radiation and other properties; at the same ti...

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Problems solved by technology

[0003] Titanium dioxide conductive powder has been used in many fields of military industry, aerospace, electronics and daily life, but their preparation methods and product performance still need to be improved and matched with the application requirements, and their application range also needs to be greatly expanded

[0005] In the research, we found that the current domestic methods have the following problems: 1. The method of titration is added to the mixed solution. Due to the influence of the reaction degree in the titration process with time, material amount, micro-region concentration and other factors, the titanium dioxide particle-coated The amount of precursor and the chemical composition of different micro-regions are almost inhomogeneous and uncontrollable; 2. The description of most preparation methods shows that the entire reaction process requires heating and temperature control, due to the hydrolysis reaction in the material during the coating process More than one, such as: hydrolysis of tin salts, antimony salts and other substances, temperature control will have differences in the degree of hydrolysis and chemical composition of the particles in different areas of the reactor and different micro-areas on the surface of the particles

Therefore, the final product has high conductivity and large fluctuations, which is difficult to use in high-end fields

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