Method for preparing copper and chromium black pigment

Abstract

The invention relates to an inorganic synthesis method for preparing a copper and chromium black pigment. The copper and chromium black pigment has the following raw material formula: 250 grams of bluevitriod, 340 to 460 grams of chromium nitrate nonahydrate, 27 to 37 grams of polyethylene glycol and 170 to 230 ml of absolute alcohol. Due to the adoption of the method, the problems of large particles and uncentralized particle diameter distribution of the copper and chromium black pigment produced by a conventional method are solved; the production steps are simplified; the calcining temperature is reduced; and compared with an organic pigment, the copper and chromium black pigment has good high temperature stability and wide application range.

Description

technical field [0001] The invention relates to a production method of copper chrome black pigment. Background technique [0002] The production method of copper chrome black pigment is well known. The main methods of producing copper chrome black pigments are traditional solid phase method and some old chemical methods. Traditional solid-phase process (see the specific process flow chart figure 1 ) mainly utilizes copper oxide and chromium oxide through ball mill mixing, drying, calcining, semi-finished product ball milling, washing, drying, and finished product. The pigments synthesized by this method are limited by the particle size of various raw materials and the performance of the ball mill. Even after a long time of ball milling, the pigments cannot be fully mixed. The contact area between the reactants is small and the reactivity is low, which makes the synthesis temperature high. Generally, it needs to be at 1200 degrees Celsius. Above, after calcination, the pig...

AI Technical Summary

Problems solved by technology

Although the particle size synthesized by these methods is relatively fine, there are disadvantages such as expensive raw materials required for synthesis, complex processes, high requirements for equipment, high temperature and high pressure during the reaction, and long reaction time, which are not conducive to realizing industrial production.

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