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Magnesium hydroxide preparation method

A technology of magnesium hydroxide and magnesium chloride solution, applied in magnesium hydroxide and other directions, can solve the problems of reducing the heat release rate, prolonging the ignition time, increasing the amount of smoke, etc., to improve the dispersion effect, reduce pollution, and improve the appearance. Effect

Inactive Publication Date: 2017-08-11
SHAANXI HUANKE BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used synergists generally include aluminum hydroxide, microencapsulated red phosphorus, zinc borate, nanoclay and platinum catalysts, etc., and some less researched synergists, etc.
An appropriate amount of red phosphorus can increase the LOI of the composite material, reduce the heat release rate, and prolong the ignition time of the material, but the amount of smoke is increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method for magnesium hydroxide, comprising the steps of:

[0020] (1) Weigh 50g of light-burned magnesium powder and 150g of ammonium chloride into a 1000mL three-neck flask, then add 500mL of water, stop the digestion reaction after 1h, and obtain a clear magnesium chloride solution;

[0021] (2) After adding water to the clarified magnesium chloride solution to 500mL, add it into a three-necked flask, and fully dissolve the surfactant in the magnesium chloride solution;

[0022] (3) Ammonia water was added dropwise for precipitation reaction, and finally the solution was suction filtered, washed and dried to obtain white magnesium hydroxide powder;

[0023] (4) taking magnesium hydroxide for hydrothermal modification;

[0024] (5) After the reaction is completed, it is fully washed with natural cooling with water, and the white precipitate of hydrothermally modified magnesium hydroxide is obtained by suction filtration. After the white precipitate is co...

Embodiment 2

[0037] Except that the surfactant used is polyethylene glycol 6000, all the other methods are the same as in Example 1.

[0038] With the continuous increase of polyethylene glycol 6000 content, the settling time of magnesium hydroxide first decreased and then increased. When the content of polyethylene glycol 6000 is small, it can be evenly dispersed in the solution and adsorbed on the surface of magnesium hydroxide to produce a steric hindrance effect, which effectively inhibits the growth of crystals and the agglomeration of particles, forming a suspension, and the upper layer of turbidity is relatively high. Many and difficult to settle, indicating that the size of the magnesium hydroxide powder is small and uniform, and the dispersion performance is good. When the content of polyethylene glycol 6000 is relatively large, due to the longer molecular chain of the active agent, the precipitation reaction is inhibited, mainly affecting the nucleation, and the particle size of ...

Embodiment 3

[0040] Except that the surfactant used is polyvinylpyrrole, all the other methods are the same as in Example 1.

[0041] With the increase of polyvinylpyrrole content, the settling time of MH first increased and then decreased. When the polyvinylpyrrole content was 1.2%, the size of magnesium hydroxide was small and uniform, and the dispersion was good. When the content of polyvinylpyrrole increased, the sedimentation velocity of magnesium hydroxide increased, the solution was rapidly stratified, and the upper layer solution immediately became clear, indicating that the size of magnesium hydroxide was larger and the dispersion was poor. The main reason is that the dispersibility of polyvinylpyrrole to magnesium hydroxide is related to its adsorption amount. When the amount of polyvinylpyrrole added is small, the adsorption amount is small and the stability is poor; when the content of polyvinylpyrrole increases to the critical micellar concentration , the adsorption reaches sa...

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PUM

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Abstract

A method for preparing magnesium hydroxide belongs to the field of chemical industry, and is characterized in that it comprises the following steps: (1) weigh light-burned magnesium powder and ammonium chloride and add them to a three-necked flask, then add water to obtain a clarified magnesium chloride solution; ( 2) Fully dissolve the surfactant in the magnesium chloride solution; (3) Add ammonia water dropwise to carry out the precipitation reaction, and finally filter, wash and dry the solution to obtain a white powder of magnesium hydroxide; (4) Take magnesium hydroxide for hydrothermal modification. (5) After the reaction is completed, it is fully washed with water by natural cooling, and suction filtration to obtain a white precipitate of hydrothermally modified magnesium hydroxide. The dispersion effect of magnesium hydroxide is improved, the morphology of magnesium hydroxide is improved, and the recycling of ammonium chloride solution in the synthesis process is realized, which reduces environmental pollution on the one hand, and saves production cost on the other hand.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a preparation method of magnesium hydroxide. Background technique [0002] Flame-retardant magnesium hydroxide generally requires a special shape such as flakes, fibers or needles, so the preparation of magnesium hydroxide with a special shape can meet the flame-retardant requirements. Appropriate reaction conditions and modification methods are crucial to the preparation of magnesium hydroxide with good filtration performance, particle size and special morphology. [0003] Although magnesium hydroxide is a green and environment-friendly flame retardant, the flame retardant efficiency of magnesium hydroxide is low. Generally, it needs to be added by 60% to achieve a certain flame retardant effect, but at this time it will seriously affect the mechanical properties of the composite material. Therefore, a synergist is usually used to synergize with magnesium hydroxide to synergize...

Claims

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Application Information

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IPC IPC(8): C01F5/20
CPCC01F5/20
Inventor 郝青
Owner SHAANXI HUANKE BIOLOGICAL TECH CO LTD
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