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Method of preparing magnesium hydroxide superfine powder

A technology of magnesium hydroxide and ultra-fine powder, applied in the direction of magnesium hydroxide, etc., can solve the problems of inability to grind fine powder, wide particle size distribution, and fineness limitation of crushing, etc., and achieve good coating modification effect and good particle size distribution The effect of concentration and small grinding fineness

Inactive Publication Date: 2007-10-24
朱晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitation is that the fineness of crushing is limited. Generally, it can only be crushed to 1250 mesh, and it can only be crushed to 3000 mesh by special methods. The particle size distribution is wide, and the gap between the largest particle size and the smallest particle size is generally 10. Above micron
Observed under the electron microscope, the crystal shape of the particles crushed by dry method is sharp, which makes the effect of coating modification not good
[0007] In the past, when trying to use wet grinding, the biggest difficulty encountered was that magnesium hydroxide was easily agglomerated after being ground with water
Especially when the grinding particle size is less than 10 microns, the slurry is thicker than the paste, the grinding media and the slurry stick together, and the grinding does not work, so it cannot be ground to a fine powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of the magnesium hydroxide superfine powder of the present invention adopts a 1360-liter vertical stirring mill, and the sizes of the grinding balls are respectively: 7.5-8.5mm, 5.5-6.5mm and 2.5-3.5mm, and the ratio is 2:4 : 4, the weight ratio of the amount of grinding balls added to the amount of material added is 4: 1, the amount of water added is a solid-to-liquid ratio of 4: 6, and the triethanolamine of 0.3% of the weight of the material is added at even intervals in the first 2 hours of grinding For dispersants, the rotational speed is controlled at 100 rpm in the early stage of grinding, and 80 rpm in the later stage of grinding. During the grinding process, use a laser particle size analyzer to measure the particle size until it reaches the grinding standard.

Embodiment 2

[0022] The preparation method of the magnesium hydroxide ultrafine powder of the present invention adopts a vertical stirring mill to grind, and continuously adds 0.5% dispersant of magnesium hydroxide weight in the initial period of the grinding process, and then continues grinding until Reach the grinding standard.

[0023] in:

[0024] The large, medium and small sizes of the grinding balls are 7.5-8.5mm, 5.5-6.5mm and 2.5-3.5mm respectively, the weight ratio is 2.1:3.8:4.2, and the weight ratio of the grinding balls to the amount of materials added is 3:1. The solid-liquid weight ratio controlled by adding water is 3:6.

[0025] The dispersant is TH903 dispersant. Add 1 / 5 of the dispersant within 1 hour at the initial stage of grinding, and then add 3 times in equal amounts at intervals of half an hour; the grinding speed is controlled by variable speed. The control speed is 70 rpm.

Embodiment 3

[0027] The preparation method of the magnesium hydroxide ultrafine powder of the present invention adopts a vertical stirring mill to grind, and continuously adds 0.8% dispersant of magnesium hydroxide weight in the initial period of the grinding process, and then continues grinding until Reach the grinding standard.

[0028] in:

[0029] The large, medium and small sizes of the grinding balls are 7.5-8.5mm, 5.5-6.5mm and 2.5-3.5mm respectively, and the weight ratio is 2:3.6:4, and the weight ratio of the grinding balls to the amount of materials added is 4:1. The solid-liquid weight ratio controlled by adding water is 3:7.

[0030] The dispersant is triethanolamine. Add 1 / 4 of the dispersant within 1 hour at the initial stage of grinding, and then add 2 times in equal amounts at intervals of half an hour; the grinding speed is controlled by variable speed. The rotational speed is 60 rpm.

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Abstract

The invention discloses a making method of hyperfine powder of magnesium hydroxide, which is characterized by the following: adding materials, grinding ball and water into vertical milling machine to grind; adding 0. 1-1% dispersant corresponding to magnesium hydroxide continuously at primary time area in the grinding course; grinding until reaching the grinding standard with middle grain size (D50) less than 1. 8um (7000 order) and maximum grain size (D100) less than 5. 0um (3000 order); obtaining the grain size (D10-D90) between 1um and 2. 7um with distributing area at 2 um and little grinding fineness; fitting for the need of large amount of adding.

Description

technical field [0001] The invention relates to an improved preparation method of magnesium hydroxide ultrafine powder. Background technique [0002] As European and American countries adopt more and more strict methods in the world, they control and prohibit the use of flame retardants containing bromine and halogens added to polymer materials such as rubber and plastics to prevent poisonous gas produced in the event of a fire. As a result, from international to domestic, more attention has been paid to the production and use of inorganic flame retardant materials. [0003] Among the two inorganic flame retardants commonly used in the world at present, magnesium hydroxide has the advantages of lower raw material cost, higher temperature resistance and better various physical properties than aluminum hydroxide, so it is more favored. [0004] In my country, the production of magnesium hydroxide inorganic flame retardant has greater advantages than that of foreign countries ...

Claims

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Application Information

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IPC IPC(8): C01F5/14
Inventor 朱晓林
Owner 朱晓林