Method of preparing high-purity high-dispersion magnesium hydroxide fire retardant

A magnesium hydroxide, high-dispersion technology, applied in the direction of fire-resistant coatings, etc., can solve the problems of low product purity, large product particle size, and low added value, and achieve the effects of improving production efficiency, improving purity, and narrowing the distribution

Inactive Publication Date: 2007-08-08
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of low product purity, difficult filtration and the formation of hydrogen bonds and liquid phase bridges due to the adsorption of a large number of free water molecules on the particle surface during the liquid phase reaction and washing process. Hard agglomeration occurs during drying, which leads to the disadvantages of large particle size, wide distribution, and low added value. A preparation method for high-purity and high-dispersion magnesium hydroxide flame retardant is provided.

Method used

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  • Method of preparing high-purity high-dispersion magnesium hydroxide fire retardant

Examples

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Effect test

Embodiment 1

[0026] A preparation method of high-purity and high-dispersion magnesium hydroxide flame retardant, comprising the following steps:

[0027] The brine is mixed with acetone to prepare a mother liquor with a magnesium chloride concentration of 0.5 mol / L, then ammonia water is added to react to obtain a slurry, the slurry is filtered, washed, and dried to obtain magnesium hydroxide powder.

[0028] Described bittern is refined bittern, considering that the raw material directly used is salt lake bittern, method is at first salt lake bittern is dissolved in water (preferably distilled water), adds a small amount of H 2 o 2 Oxidize the impurity ions therein, adjust the pH value to 6.5, and filter after standing for 3 hours to obtain refined brine.

[0029] The refined brine is mixed with acetone to prepare a mother liquor with a magnesium chloride concentration of 0.5 mol / L. In the prepared mother liquor, acetone accounts for 5% by volume of the mother liquor, the temperature is ...

Embodiment 2

[0033] A preparation method of high-purity and high-dispersion magnesium hydroxide flame retardant, comprising the following steps:

[0034] Mix brine and acetone to prepare a mother liquor with a magnesium chloride concentration of 3.0 mol / L, then add ammonia water to react to obtain a slurry, filter, wash, and dry the slurry to obtain magnesium hydroxide powder.

[0035] Described bittern is refined bittern, considering that the raw material directly used is salt lake bittern, method is at first salt lake bittern is dissolved in water (preferably distilled water), adds a small amount of H 2 o 2 Oxidize the impurity ions therein, adjust the pH value to 7.5, and filter after standing for 10 hours to obtain refined brine.

[0036] The refined brine is mixed with acetone to prepare a mother liquor with a magnesium chloride concentration of 3.0 mol / L. In the prepared mother liquor, acetone accounts for 50% of the mother liquor by volume. The temperature is controlled at 35° C. a...

Embodiment 3

[0040] A preparation method of high-purity and high-dispersion magnesium hydroxide flame retardant, comprising the following steps:

[0041] Mix brine and acetone to prepare mother liquor with a concentration of magnesium chloride of 2.0 mol / L, then add ammonia water to react to obtain slurry, filter, wash, and dry the slurry to obtain magnesium hydroxide powder.

[0042] Described bittern is refined bittern, considering that the raw material directly used is salt lake bittern, method is at first salt lake bittern is dissolved in water (preferably distilled water), adds a small amount of H 2 o 2 Oxidize the impurities therein, adjust the pH value to 7, and filter after standing for 5 hours to obtain refined brine.

[0043] The refined brine is mixed with acetone to prepare a mother liquor with a concentration of magnesium chloride of 2.0 mol / L. In the prepared mother liquor, acetone accounts for 60% of the mother liquor by volume. The temperature is controlled at 25° C. and s...

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Abstract

The invention discloses a making method of high-purity high-dispersing magnesium hydroxide flameproof agent, which comprises the following steps: allocating mother liquid with density at 0.5-3.0mol/L through bittern and acetone; adding ammonia to prepare slurry; filtering; washing; drying to obtain the product.

Description

technical field [0001] The invention relates to a preparation method of an inorganic flame retardant, in particular to a preparation method of a high-purity and high-dispersion magnesium hydroxide flame retardant. Background technique [0002] Flame retardants can be divided into two categories: organic flame retardants and inorganic flame retardants according to their chemical composition. Inorganic flame retardants, especially magnesium hydroxide, can not only play a flame retardant role, but also can play a filling role. It has the characteristics of good thermal stability, high efficiency, smoke suppression, drip resistance, safe filling, and basically no pollution to the environment. It is widely used in flame-retardant materials, and can be used in plastic and rubber industries such as polyethylene, polypropylene, polyvinyl chloride, high-impact polystyrene and ABS. Although aluminum hydroxide entered the market earlier, its consumption is much larger than that of mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/02C08K3/22
Inventor 胡国胜张翠梅王标兵吴湘锋
Owner ZHONGBEI UNIV
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