Process for producing nano-flame-proof magnesium hydroxide

A magnesium hydroxide and nano-flame retardant technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of difficult control of crystal particle size and low purity, and achieve the effect of mild reaction conditions and wide source of raw materials

Inactive Publication Date: 2008-07-16
TIANJIN URBAN CONSTR COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to provide a method for preparing nano-flame-retardant magnesium hydroxide from magnesium salts, so as to make up for the defects of the prior art or that the purity is not high or the crystal particle size is difficult to control

Method used

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  • Process for producing nano-flame-proof magnesium hydroxide

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Embodiment 1

[0019] First, dissolve 51 grams of bischofite with deionized water, add water to about 1 liter, and remove insoluble impurities by suction filtration. Dissolve 20 grams of sodium hydroxide in a 1-liter beaker at room temperature; then use a metering pump to inject the two reaction solutions into the impingement flow reactor, control the impact flow rate at 100ml / min, and the residence time in the reactor for 30 min; finally after washing, filtering, and drying at 120°C to obtain magnesium hydroxide. Its purity is 99.4%, the average particle size is 13.5nm, and TEM analysis shows that it is flaky crystal.

Embodiment 2

[0021] Dissolve 20.3 grams of bischofite with deionized water, add water to about 1 liter, and remove insoluble impurities by suction filtration. Dissolve 10 grams of sodium hydroxide in a 1-liter beaker at a temperature of 40°C; use a metering pump to inject the two reaction solutions into the impingement flow reactor, and control the impact flow rate at 50ml / min. The residence time is 30min; finally, it is washed, filtered, and dried at 120°C to obtain magnesium hydroxide. Its purity is 98%, the average particle size is 19.8nm, and TEM analysis shows that it is flaky crystal.

Embodiment 3

[0023] Dissolve 20.3 grams of bischofite with deionized water, add water to about 1 liter, and remove insoluble impurities by suction filtration. Dissolve 10 grams of sodium hydroxide in a 1-liter beaker at a temperature of 60°C; use a metering pump to inject the two reaction solutions into the impingement flow reactor, and control the impact flow rate at 100ml / min. The residence time is 30min; finally, it is washed, filtered, and dried at 120°C to obtain magnesium hydroxide. Its purity is 98.9%, the average particle size is 17.6nm, and TEM analysis shows that it is needle-like crystal.

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Abstract

The invention relates to a method for preparing nanometer flame-retardant-grade magnesium hydrate by using an impinging stream and through the surface modification. The main processes are: the magnesia ion solution obtained by means of the salt lake water chloromagnesite or impurity removal of concentrated brine after sea water desalinization is reacted with a sodium hydroxide to crystallize and couple to prepare nanometer magnesium hydrate; proper surface activator is selected to modify the nanometer magnesium hydrate, which can obtain acicular or flake magnesium hydrate of 10-20nm. The technological characteristics are: 1) the purity of the magnesium hydrate of which the material source is widely obtained can be above 98 percent; 2) by adopting a jet impinging stream reaction crystallizer, the reacting conditions such as impinging stream rate can be regulated to control granularity and the shape of the crystal; 3) the reacting condition is moderate and the selected surface modifier has no harm to environment.

Description

technical field [0001] The invention relates to a preparation process of magnesium hydroxide, in particular to a preparation method of nano-flame-retardant magnesium hydroxide with controllable particle size, and belongs to the technical field of inorganic chemical industry. technical background [0002] Magnesium hydroxide is an important additive inorganic flame retardant. It releases bound water when heated (340°C), absorbs a large amount of latent heat, has a cooling effect, and inhibits smoke in the early stage of combustion. The generated oxidation Magnesium has good fire resistance and will not cause secondary pollution to the environment. Due to its characteristics in thermal reaction, decomposition temperature, applicable polymers, flame retardant ability, smoke suppression ability, and acid stability, it is an environmentally friendly green flame retardant. Magnesium hydroxide has a high thermal decomposition temperature, which is nearly 140°C higher than the comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22
Inventor 赵建海张敏
Owner TIANJIN URBAN CONSTR COLLEGE
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