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Method for preparing submicron lamellar magnesium hydroxide by intensifying alkali

A magnesium hydroxide, sub-micron technology, applied in the direction of magnesium hydroxide, etc., can solve the problems that the crystallinity and shape of magnesium hydroxide are difficult to meet the requirements of flake magnesium hydroxide flame retardants, and the cost of magnesium hydroxide increases. Achieve the effect of reducing the activation energy of hydrolysis reaction, saving the alkali used for precipitation, and shortening the preparation process

Active Publication Date: 2011-06-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of magnesium hydroxide by the above-mentioned various alkali precipitation methods all need to consume precipitant-alkali, thus greatly increasing the cost of magnesium hydroxide
[0005] 相对而言,利用氧化镁制备氢氧化镁工艺较为简单(CN 90102696.4、CN97117352.4、CN200410021248.2、CN200610146040.2、CN200610046754.6、CN200610140458.2、CN200510013551.2、CN200510047743.5、CN200610017917.8、 CN200710000049.7, CN200810010163.2), but the crystallinity and morphology of magnesium hydroxide prepared by these processes are difficult to reach the requirements of flake magnesium hydroxide flame retardant

Method used

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  • Method for preparing submicron lamellar magnesium hydroxide by intensifying alkali
  • Method for preparing submicron lamellar magnesium hydroxide by intensifying alkali
  • Method for preparing submicron lamellar magnesium hydroxide by intensifying alkali

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The composition of magnesium oxide is that the content of MgO is 98.5%, and the loss on ignition is less than 4.5%.

[0043] Mix the above-mentioned magnesium oxide powder 20.2g, sodium hydroxide 10g, 0.5g polyvinylpyrrolidone and 100.0 water;

[0044] Transfer to a 500ml nylon ball mill jar, and use 100g of reburned magnesium oxide grinding balls with a diameter of 6mm for 4h at a speed of 400r / min to form a slurry to be crystallized.

[0045] Pour the above-mentioned slurry to be crystallized into a 200ml pressure volume bomb lined with Teflon, and crystallize at 200°C for 4 hours (h);

[0046] After the above reaction, the slurry was suction filtered at room temperature, washed three times with deionized water, washed once with industrial ethanol, and dried in an oven at 120° C. for 3 hours to obtain flaky magnesium hydroxide.

[0047] The XRD diffraction pattern of the obtained magnesium hydroxide structure is as follows figure 2 shown, the appearance is as ima...

Embodiment 2

[0049]Mix above-mentioned magnesium oxide powder 1kg, ammonia water 200ml, 5g polyvinyl alcohol and 5kg water;

[0050] Transfer to SX-30 type stirring ball mill, use 5kg diameter 6mm reburned magnesia grinding ball for 8h, power is 2kw, form the slurry to be crystallized.

[0051] Transfer the above slurry to be crystallized into a 10L stirring reaction kettle, and crystallize at 160°C for 10h,

[0052] After the above reaction, the slurry was suction filtered at room temperature, washed three times with deionized water, washed once with industrial ethanol, and dried in an oven at 120° C. for 3 hours to obtain flaky magnesium hydroxide.

Embodiment 3

[0054] Mix the above-mentioned magnesium oxide powder 20.2g, diethylamine 10g, 0.5g polyvinylpyrrolidone and 100.0 water;

[0055] Transfer to a 500ml nylon ball mill jar, and use 100g of reburned magnesium oxide grinding balls with a diameter of 6mm for 4h at a speed of 400r / min to form a slurry to be crystallized.

[0056] Pour the above slurry to be crystallized into a 200ml pressure volume bomb lined with PTFE, and crystallize at 200°C for 4h;

[0057] After the above reaction, the slurry was suction filtered at room temperature, washed three times with deionized water, washed once with industrial ethanol, and dried in an oven at 120° C. for 3 hours to obtain flaky magnesium hydroxide.

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Abstract

The invention relates to a method for preparing submicron lamellar magnesium hydroxide by intensifying alkali, comprising the following steps of: mixing magnesium oxide, the alkali, a dispersing agent and water into slurry according to a certain proportion; carrying out mechanical and chemical treatment to prepare the slurry used for crystallization; carrying out hydrothermal crystallization; carrying out solid-liquid separation on a product, and washing and drying a solid to obtain submicron lamellar magnesium hydroxide powder. In the invention, filter liquor can be recycled; the hydrolysis of the magnesium oxide and the nucleation of the magnesium hydroxide are promoted by utilizing mechanical and chemical action and alkali intensifying action, the shape and the growth of a magnesium hydroxide crystal is regulated and controlled through the hydrothermal crystallization, and no alkali is consumed in the process; as the magnesium oxide is used as a raw material and an alkalizing mechanical and chemical treatment-hydrothermal crystallization process is adopted, the preparation process flow of the submicron high-dispersion lamellar magnesium hydroxide is shortened, the consumption of the alkali used for a process for preparing the magnesium hydroxide by precipitating soluble magnesium salt and the cost input are decreased, and the hydrothermal crystallization process does not generate any side product like chemical salt and is a clean production process; and in addition, the obtained submicron lamellar magnesium hydroxide is widely used in the fields of flame-retardant and catalytic carriers and other functional materials.

Description

Field of Invention [0001] The invention belongs to the technical field of preparation of fine chemical materials, and in particular relates to a submicron flake magnesium hydroxide used in the fields of materials, chemical industry, environment and medicine. Prepared by crystallization method. Background technique [0002] Magnesium Hydroxide (Mg(OH) 2 ) belongs to the hexagonal crystal system and can be grown into crystals of various shapes according to the crystallization conditions. Submicron magnesium hydroxide is widely used in many fields such as materials, chemical industry, environment and medicine. Especially when sub-micron flaky magnesium hydroxide is used as a flame retardant, it has an appropriate decomposition temperature (623K), a large heat absorption, not only flame retardant, smoke suppression and filling functions, but also no toxic gas and no corrosion. , so it develops faster. Therefore, the preparation and surface modification of submicron highly di...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F5/22
Inventor 卢旭晨王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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