Method for preparing monodisperse flaky magnesium hydroxide flame retardant

A technology of magnesium hydroxide and flame retardant, applied in magnesium hydroxide and other directions, can solve the problems of irregular shape of magnesium hydroxide, high equipment requirements, difficult filtration, etc., and achieves low equipment material requirements, low production cost, and low technology simple effect

Active Publication Date: 2011-10-05
青海艾特克盐湖科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of irregular shape, difficult filtration and high equipment requirements during hydrothermal treatment of magnesium hydroxide prepared in the prior art, and to provide a preparation unit with low production cost, simple process and easy operation. Method for dispersing magnesium hydroxide flame retardant with regular morphology

Method used

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  • Method for preparing monodisperse flaky magnesium hydroxide flame retardant
  • Method for preparing monodisperse flaky magnesium hydroxide flame retardant
  • Method for preparing monodisperse flaky magnesium hydroxide flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Dissolve bischofite with deionized water, filter to remove insoluble impurities, calibrate the magnesium ion concentration to 4.00mol / l by EDTA method, and obtain a magnesium chloride solution for use;

[0026] 2. Take 300ml of 8.00mol / l sodium hydroxide solution and add it to the IPC-3A intelligent reactor at a speed of 2500rpm. After the sodium hydroxide solution is heated to 60°C, add magnesium ions at a flow rate of 10ml / min. 300ml of the above-mentioned magnesium chloride solution of 4.00mol / l;

[0027] 3. After adding the magnesium chloride solution, continue to react at a constant temperature of 60°C and a rotating speed of 2500rpm for 60 minutes, dilute the reacted slurry with deionized water until the concentration of magnesium hydroxide is 10% by mass;

[0028] 4. Take 400ml of the diluted slurry and put it into a 2L autoclave for hydrothermal reaction at 200°C and 700rpm for 1h;

[0029] 5. Dry the filtered and washed product at 100°C for 6 hours to obtai...

Embodiment 2

[0034] 1. Dissolve bischofite with deionized water, filter to remove insoluble impurities, calibrate the magnesium ion concentration to 3.45mol / l by EDTA method, and obtain a magnesium chloride solution for use;

[0035] 2. Take 300ml of 6.90mol / l sodium hydroxide solution and add it to the IPC-3A intelligent reactor at a speed of 2500rpm. After the sodium hydroxide solution is heated to 60°C, add magnesium ions at a flow rate of 10ml / min. 300ml of the above-mentioned magnesium chloride solution of 3.45mol / l;

[0036] 3. After adding the magnesium chloride solution, continue to react at a constant temperature of 60°C and a rotating speed of 2500rpm for 60 minutes, dilute the reacted slurry with deionized water until the concentration of magnesium hydroxide is 10% by mass;

[0037] 4. Take 400ml of the diluted slurry and put it into a 2L autoclave for hydrothermal reaction at 120°C and 400rpm for 4h;

[0038] 5. Dry the filtered and washed product at 120°C for 6 hours to obtai...

Embodiment 3

[0043] 1. Dissolve magnesium sulfate with deionized water, filter to remove insoluble impurities, and calibrate the concentration of magnesium ions to 0.5mol / l by EDTA method to obtain magnesium sulfate solution for use;

[0044] 2. Take 300ml of 0.5mol / l sodium hydroxide solution and add it to the IPC-3A intelligent reactor at a speed of 2500rpm. After the sodium hydroxide solution is heated to 60°C, add magnesium ions at a flow rate of 10ml / min. 150ml of 0.5mol / l solution;

[0045] 3. After adding the magnesium sulfate solution, continue to react at a constant temperature of 60°C and a rotating speed of 2500rpm for 60 minutes, dilute the reacted slurry with deionized water until the concentration of magnesium hydroxide is 10% by mass;

[0046] 4. Take 400ml of the diluted slurry and put it into a 2L autoclave for hydrothermal reaction at 100°C and 700rpm for 4h;

[0047] 5. Dry the washed product at 120°C for 6 hours to obtain the desired product.

[0048] The test results...

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Abstract

The invention relates to a method for preparing a monodisperse flaky magnesium hydroxide flame retardant. The method comprises the following steps of: preparing a soluble magnesium salt into a solution with magnesium ion concentration of more than 0.5mol/l; adding sodium hydroxide with hydroxyl ion concentration of more than 0.5mol/l or an ammonia aqueous solution at a temperature of 25-60 DEG C, a stirring rate of 1,500-4,000rmp and a constant flow rate under a constant pressure for precipitation reaction; reacting until the molar ratio of magnesium ions to hydroxyl ions is 1 to 2; transferring the reacted slurry into a high pressure reaction kettle, wherein the hydro-thermal reaction temperature is 100-200 DEG C, the reaction time is 1-6 hours and the stirring rate is 300-700 rpm; and after filtering and washing a product, drying the product at the temperature of 100-160 DEG C for 4-6 hours to obtain the magnesium hydroxide flame retardant which has a shape of hexagonal sheet or circular sheet, a grain size from 200nm to 500 nm and excellent dispersibility. By using the method provided by the invention, the problems that nano-sized magnesium hydroxide is subjected to hydro-thermal reaction only in a strong alkali system at a higher temperature and the requirement on equipment material is higher are solved.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and chemical industry, and relates to a preparation process of magnesium hydroxide, in particular to a method for preparing an ultrafine highly dispersed magnesium hydroxide flame retardant by using soluble magnesium salt as a raw material. technical background [0002] As an important inorganic salt compound of magnesium, magnesium hydroxide has a wide range of uses. It can be used as a flame retardant, acid waste water neutralizer, heavy metal waste water precipitant, flue gas desulfurizer, cosmetics and food additives, etc. An important raw material for magnesium. Especially when used as an inorganic flame retardant, it has high decomposition temperature, strong smoke suppression ability, good flame retardant effect, and no toxic or corrosive substances after decomposition, so it has received more and more attention. [0003] Magnesium hydroxide is added to the polymer as a non-pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22C09K21/02C08K3/22
Inventor 刘志启李丽娟聂峰曾忠民张波
Owner 青海艾特克盐湖科技有限公司
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