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

A technology of aluminum hydroxide and activated aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve problems such as high oil absorption value, reduced flame retardancy, and poor filling performance, and achieves Reduce oil absorption value, improve flame retardant effect, increase the effect of filling amount

Active Publication Date: 2020-07-24
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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preparation example Construction

[0016] The first aspect of the present invention provides a method for preparing aluminum hydroxide with low oil absorption value, wherein the method comprises the following steps:

[0017] (1) adding an organic compound containing polyhydroxyl groups to the Bayer process sodium aluminate solution and mixing uniformly to obtain a raw material solution;

[0018] (2) carrying out the first division of the raw material liquid and the activated aluminum hydroxide seed slurry to obtain a decomposition liquid;

[0019] (3) performing a second separation of the decomposed liquid and an organic acid insoluble in the decomposed liquid to obtain a decomposed slurry;

[0020] (4) Rapidly raising the temperature of the decomposed slurry for crystallization, then removing the organic acid salt, and filtering, washing and drying the obtained slurry to obtain aluminum hydroxide with low oil absorption value.

[0021] In the present invention, the preparation method of the Bayer process sodi...

preparation example 1

[0042] Preparation of active aluminum hydroxide seed slurry 1: Mix 50g of aluminum hydroxide fine powder (particle size: 62 μm, purchased from Luoyang Xiangjiang Wanji Aluminum Co., Ltd., batch: 20161220) with 1L of deionized water, with a solid content of 50g / L, using a ball mill (purchased from Foshan Yejin Electromechanical Equipment Co., Ltd., the model is YJKS) to grind the aluminum hydroxide particles in the above mixture to the median particle size (D 50 )=0.6-1.0 μm, the obtained aluminum hydroxide slurry is the active aluminum hydroxide seed slurry.

preparation example 2

[0044] Preparation of active aluminum hydroxide seed slurry 2: Mix 200g of aluminum hydroxide fine powder with 1L of deionized water, with a solid content of 200g / L, and use a ball mill to grind the aluminum hydroxide particles in the above mixture to D 50 =0.6-1.0 μm, the obtained aluminum hydroxide slurry is the activated aluminum hydroxide seed slurry.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14C09K21/02
CPCC01F7/14C01P2004/61C01P2004/62C09K21/02
Inventor 邓魁王茜裴广斌吴建华
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD