Aluminum hydroxide with low oil absorption value and its preparation method and application

Abstract

The invention relates to the field of aluminium hydroxide preparation, and discloses aluminium hydroxide with low oil absorption value, a preparation method and application thereof. The preparation method of aluminium hydroxide with low oil absorption value includes the following steps: (1) adding an organic compound containing polyhydroxyl into a sodium aluminate solution in a Bayer process, andconducting uniform mixing to obtain raw material liquid; (2) performing first seed decomposition on the raw material liquid and active aluminium hydroxide seed slurry to obtain decomposed liquid; (3)performing second seed decomposition on the decomposed liquid and organic acid insoluble in the decomposed liquid to obtain decomposed slurry; and (4) rapidly heating the decomposed slurry, carrying out crystallization, then removing organic acid salts, and filtering, washing and drying the obtained slurry to obtain aluminium hydroxide with low oil absorption value. According to the aluminium hydroxide with low oil absorption value prepared by the method of the invention, the oil absorption value can be reduced to 28-30ml / 100g, and the aluminium hydroxide filling amount in unit volume is increased, thereby improving the flame retardant effect.

Description

technical field [0001] The invention relates to the field of preparation of aluminum hydroxide, in particular to aluminum hydroxide with low oil absorption value and its preparation method and application. Background technique [0002] With the further emphasis on safety and fire prevention at home and abroad, various industries have put forward higher and more diversified requirements for the flame retardant properties of materials, which has brought about continuous growth in the market demand for flame retardants. Existing flame retardants mainly include halogen-based, phosphorus-based, nitrogen-based, and inorganic hydroxide series. Among them, the hydrogen halide gas released by halogen-based flame retardants during combustion is toxic and corrosive, and will also be produced in daily use. Carcinogens have been banned in Europe and the United States; phosphorus-nitrogen flame retardants have relatively high production costs, and a large amount of polluting waste water a...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of high oil absorption value of aluminum hydroxide and poor filling performance in the prior art, resulting in reduced flame retardant performance, to provide aluminum hydroxide with low oil absorption value and its preparation method and application, through the method of the present invention The prepared aluminum hydroxide with low oil absorption value can reduce the oil absorption value to 28-30ml / 100g, and increase the filling amount of aluminum hydroxide per unit volume, thereby improving the flame retardant effect