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Method for preparing superfine magnesium hydroxide for flame retardant by taking magnesium hydroxide coarse powder as raw material

A technology of ultra-fine magnesium hydroxide and magnesium hydroxide, applied in magnesium hydroxide and other directions, can solve problems such as corrosion of reaction equipment, and achieve the effects of reducing equipment cost, simple production process and high added value of products

Active Publication Date: 2021-02-26
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology requires the use of a large amount of strong alkali, which makes the reaction equipment severely corroded

Method used

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  • Method for preparing superfine magnesium hydroxide for flame retardant by taking magnesium hydroxide coarse powder as raw material
  • Method for preparing superfine magnesium hydroxide for flame retardant by taking magnesium hydroxide coarse powder as raw material
  • Method for preparing superfine magnesium hydroxide for flame retardant by taking magnesium hydroxide coarse powder as raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 300 grams of magnesium hydroxide coarse powder with a purity of ≥95%, an original particle size of 0.1-3 microns, and an average agglomerated particle size of 45 microns as a raw material. Insulated for 3 hours to obtain the depolymerized intermediate of magnesium hydroxide. Using it as a raw material, add 0.9 g of polyacrylamide as a dispersant and deionized water to make a slurry with a solid content of 25%, transfer it to a ball mill, and grind until the particle size d50 is 3.5 microns. After adding 35 grams of NaOH shape-directing agent to the slurry and stirring evenly, transfer it to a high-pressure reactor, keep it at 200° C. for 14 hours, and then filter it with suction. The filtrate is evaporated and concentrated for reuse, and the filter cake is washed and flashed to obtain superfine magnesium hydroxide products.

[0028] figure 2 is Mg(OH) 2 XRD spectrum of coarse powder after low-temperature roasting. image 3 is Mg(OH) 2 SEM image of coarse pow...

Embodiment 2

[0030] Weigh 300 grams of magnesium hydroxide coarse powder with a purity ≥ 95%, an original particle size of 0.1-3 microns, and an average agglomerated particle size of 25 microns as a raw material, heat up to 420 ° C at a speed of 1 ° C / min in an air atmosphere, and keep warm for 1 hour Obtain the intermediate of magnesium hydroxide depolymerization (main component is still magnesium hydroxide, XRD spectrogram and with figure 1 Same; Coarse powder of flaky accumulation, SEM figure and image 3 same). Using it as a raw material, add 1 gram of polyvinyl alcohol (polymerization degree 2000) and deionized water as a dispersant to make a slurry with a solid content of 30%, transfer it to a ball mill, and grind until the particle size d50 is 3.8 microns. Add 35 grams of KOH shape-directing agent to the slurry, stir evenly, transfer to an autoclave at 200° C. for 14 hours, and then filter with suction. The filtrate is evaporated and concentrated for reuse, and the filter cake i...

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Abstract

The invention relates to a method for preparing superfine magnesium hydroxide for a flame retardant by taking magnesium hydroxide coarse powder as a raw material, and belongs to the field of preparation of inorganic chemical materials. The method includes: with magnesium hydroxide coarse powder with the primary particle size of 0.1-5 micron and the average agglomeration particle size of 10-50 microns as a raw material, roasting thepowder for 0.5-4 hour at the temperature of 300-450 DEG C to obtain a magnesium hydroxide thermal decomposition intermediate; then by taking the intermediate as a raw material, adding a dispersing agent to prepare slurry with a certain concentration, grinding the mixture, adding a morphology directing agent, carrying out hydrothermal reaction, separating the reaction product, and evaporating and concentrating the filtrate, and recycling the filtrate; and washing and flashing the obtained filter cake to obtain the superfine magnesium hydroxide. The ultrafine magnesium hydroxide has the advantages of small particle size (1-3 microns), narrow particle size distribution, good dispersibility, wide application in the field of flame retardants, and high added value of the product. The method is simple in technological process, low in requirement for production equipment and environment-friendly.

Description

technical field [0001] The method relates to a method for preparing superfine magnesium hydroxide for a flame retardant by using coarse magnesium hydroxide powder as a raw material, and belongs to the field of preparation of inorganic chemical materials. Background technique [0002] Magnesium hydroxide is an important inorganic chemical product. As an inorganic flame retardant, it has the advantages of good smoke suppression effect, high decomposition temperature, and non-corrosiveness. However, due to the layered structure of magnesium hydroxide itself, it has greater polarity and is easy to agglomerate into blocks, resulting in poor dispersion and compatibility in organic matter, and poor processability. Ultrafine magnesium hydroxide with small surface polarity, good dispersion, concentrated particle size of 1-3 microns and a specific surface area of ​​less than 10m2 / g is widely used in the field of flame retardants. At present, there are few domestic manufacturers that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14
CPCC01F5/14C01P2002/72C01P2004/03C01P2004/22
Inventor 李敏裴广斌苗龙强王茜
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD