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Preparation method of magnesium hydroxide flame retardant and the magnesium hydroxide flame retardant

A magnesium hydroxide and flame retardant technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of high preparation cost and insufficient product purity, and achieve the effects of short reaction time, mild reaction temperature and simple process

Inactive Publication Date: 2017-04-05
营口东吉科技(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of insufficient purity of the product obtained by the preparation method of magnesium hydroxide flame retardant in the prior art and high preparation cost, the present invention provides a preparation method of magnesium hydroxide flame retardant with high product purity and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the reactor of 2L, add 500mL mass fraction and be that the magnesium chloride solution of 10% is warming up to 60 ℃, adds composite precipitation agent with the flow rate of 20ml / min, and the calcium oxide mass fraction of described composite precipitation agent is 15%, the sodium hydroxide The mass fraction is 0.1%, the mass ratio of calcium oxide to magnesium oxide is 200: 1, and the amount of composite precipitant added is 98.5% of the theoretical amount required for the complete precipitation of magnesium ions. Continue constant temperature reaction 45min washing and filtering, until there is no chloride ion in the filtrate, the magnesium hydroxide filter cake is carried out reslurry processing, obtains the magnesium hydroxide slurry, makes the concentration of the magnesium hydroxide slurry after the slurry be 40%, then in Grind zirconia with a diameter of 1 mm in a circulating ball mill for 60 minutes and dry.

Embodiment 2

[0024] In the reactor of 2L, add 500mL mass fraction and be that the magnesium chloride solution of 15% is warming up to 60 ℃, adds composite precipitating agent with the flow rate of 20ml / min, and the calcium oxide mass fraction of described composite precipitating agent is 20%, the sodium hydroxide The mass fraction is 0.5%, the mass ratio of calcium oxide to magnesium oxide is 150: 1, and the amount of the composite precipitant added is 98.5% of the theoretical amount required for the complete precipitation of magnesium ions. Continue constant temperature reaction 60min washing and filtering, until there is no chloride ion in the filtrate, the magnesium hydroxide filter cake is carried out reslurry processing, obtains the magnesium hydroxide slurry, makes the concentration of the magnesium hydroxide slurry after the repulping be 50%, then in Grind zirconia with a diameter of 1 mm in a circulating ball mill for 60 minutes and dry.

Embodiment 3

[0026] In the reactor of 2L, add 500mL mass fraction and be that the magnesium chloride solution of 20% is warming up to 60 ℃, adds composite precipitating agent with the flow rate of 20ml / min, and the calcium oxide mass fraction of described composite precipitating agent is 10%, the sodium hydroxide The mass fraction is 0.1%, the mass ratio of calcium oxide to magnesium oxide is 100: 1, and the amount of the composite precipitant added is 98.5% of the theoretical amount required for the complete precipitation of magnesium ions. Continue constant temperature reaction 60min washing and filtering, until there is no chloride ion in the filtrate, the magnesium hydroxide filter cake is carried out reslurry processing, obtains the magnesium hydroxide slurry, makes the concentration of the magnesium hydroxide slurry after the repulping be 50%, then in Grind zirconia with a diameter of 1 mm in a circulating ball mill for 90 minutes and dry.

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Abstract

The invention discloses a preparation method of a magnesium hydroxide flame retardant and the magnesium hydroxide flame retardant. The preparation method comprises the following steps: (1) preparing a magnesium chloride solution, wherein mass percentage of magnesium chloride in the magnesium chloride solution is 20-40%; (2) heating the magnesium chloride solution to required temperature and adding a composite precipitator, which is formed by mixing calcium oxide, magnesium oxide, sodium hydroxide and water, to the solution; (3) after the composite precipitator is added completely, washing and filtering the precipitate to obtain magnesium hydroxide filter cake, and then repulping the magnesium hydroxide filter cake; (4) drying the magnesium hydroxide filter cake in a vacuum drying box at 50 DEG C for 3-10 h; and (5) crushing and grinding the dried magnesium hydroxide to produce the magnesium hydroxide flame retardant. Purity of magnesium hydroxide in the flame retardant reaches not less than 99.0%. The flame retardant has excellent flame retarding effects and has simple preparation process and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a preparation method of a magnesium hydroxide flame retardant and the magnesium hydroxide flame retardant. Background technique [0002] Flame retardant refers to an important additive that can improve the flame retardancy of combustibles or combustibles, prevent materials from being ignited and inhibit flame spread. play an important role. Among them, magnesium hydroxide flame retardant is one of the most widely used varieties of halogen-free flame retardants. Because magnesium hydroxide is flame retardant, it also has the characteristics of smoke suppression, thermal stability, promotion of carbonization of substrates, and acid removal ability. [0003] There are two main methods for producing magnesium hydroxide: one is the direct crushing method of brucite; the other is the reaction conversion method of magnesium-containing raw materials. Due to the low purity of natural br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22C09K21/02
CPCC01F5/22C01P2006/80C09K21/02
Inventor 王福明曾凡东林宇
Owner 营口东吉科技(集团)有限公司