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Preparation method for flame retardant magnesium hydroxide

A technology of magnesium hydroxide and flame retardants, applied in the chemical field, can solve the problems of composite materials such as the decline in electrical performance and low purity

Active Publication Date: 2012-06-13
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

However, due to the low purity of natural brucite and the high content of impurities such as iron and calcium, adding it as a flame retardant to polymer materials often leads to a decline in the electrical properties of composite materials

Method used

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  • Preparation method for flame retardant magnesium hydroxide
  • Preparation method for flame retardant magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see figure 1 , is a schematic flow diagram of an embodiment of the preparation method of the magnesium hydroxide flame retardant of the present invention. The preparation method of the magnesium hydroxide flame retardant comprises:

[0030] Step S1, dissolving, dissolving the magnesium ion compound in an aqueous solution and heating to form a solution containing magnesium ions;

[0031] Step S2, filtering, filtering the solution containing magnesium ions obtained in step S1;

[0032] Step S3, precipitation / reaction, adding a precipitating agent to the filtered magnesium ion solution to generate magnesium hydroxide and carry out precipitation;

[0033] Step S4, filtering, filtering the precipitate to obtain magnesium hydroxide;

[0034] Step S5, washing, washing and filtering the magnesium hydroxide, specifically including the washing of the mother liquor in the front section and the washing of impurities in the back section, wherein the washing of the mother liquor c...

Embodiment 2

[0040] In another embodiment of the present invention, comprising the steps of:

[0041] Dissolving, magnesium sulfate is dissolved in aqueous solution;

[0042] Filter to obtain a magnesium sulfate solution with a concentration of 1.9M;

[0043] For precipitation / reaction, take 300ml of magnesium sulfate solution with a concentration of 1.9M, heat it up to 70°C (Celsius), add 2mol / L ammonia water at a flow rate of 60ml / min, and control the pH value of the reaction end point within 8-10;

[0044] Filter and filter the precipitate to obtain magnesium hydroxide;

[0045] Washing, wash the magnesium hydroxide precipitate several times with distilled water with a conductivity of less than 0.2mS / m at 60°C to obtain a purity of more than 99%, a chlorine content of less than 0.05%, an iron content of less than 100ppm, and a particle size of about 1.2μm high-purity magnesium hydroxide products;

[0046] Repulping, taking a certain amount of high-purity magnesium hydroxide, adding a...

Embodiment 3

[0050] In another embodiment of the present invention, comprising the steps of:

[0051] Dissolving, magnesium chloride is dissolved in aqueous solution;

[0052] Filter to obtain a concentration of magnesium chloride solution that is 2.84mol / L;

[0053] For precipitation / reaction, add 500mL distilled water into a 2L reactor and heat up to 65°C, then add the above magnesium chloride solution at a flow rate of 6ml / min, and at the same time add 6.72mol / L ammonia water at a flow rate of 5ml / min for 51min , the pH value of the whole reaction process remains in the range of 8-10;

[0054] Filter and filter the precipitate to obtain magnesium hydroxide;

[0055] Washing, wash the magnesium hydroxide precipitate several times with distilled water with a conductivity less than 0.2mS / m, to obtain high-purity magnesium hydroxide with a purity greater than 99%, a chlorine content of less than 0.05%, an iron content of less than 100ppm, and a particle size of about 7 μm ;

[0056] Re-...

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Abstract

The invention discloses a preparation method for flame retardant magnesium hydroxide, which includes: a, dissolving: dissolving magnesium ionic compound into aqueous solution to generate magnesium ion contained solution; b, precipitation / reaction: adding precipitating agent into filtered magnesium ionic solution to generate magnesium hydroxide and then precipitating; c, filtering: filtering precipitate to obtain magnesium hydroxide; d, scrubbing: scrubbing the filtered magnesium hydroxide, wherein the scrubbing includes forepart mother liquid scrubbing and later impurity scrubbing, the forepart mother liquid scrubbing is used for scrubbing entrained mother liquid and uses normal water as scrubbing solution which can be recovered for dissolving magnesium salt at the step a, and the later impurity scrubbing is used for scrubbing impurities entrained by precipitate and soluble impurities and uses deionized water with electric conductivity smaller than 0.2mS / m as scrubbing solution; e, repulping, adding a certain quality of water into filtered magnesium hydroxide for repulping to obtain magnesium hydroxide slurry of a certain mass fraction; and f, grinding: grinding the magnesium hydroxide slurry in a zirconia circulative ball mill. Finished flame retardant magnesium hydroxide produced by the preparation method is higher in impurity and proper in particle size distribution.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a method for preparing a magnesium hydroxide flame retardant. Background technique [0002] Because fire is very harmful to the safety of people's life and property, it is very important to prevent fire and reduce the possibility of fire. Among them, flame retardant treatment of polymers is one of the important measures to reduce fires. [0003] Flame retardant is an important additive that can improve the flame retardancy of flammable or combustible materials, prevent materials from being ignited and inhibit flame spread. play an important role. [0004] Magnesium hydroxide flame retardant is one of the most widely used varieties of halogen-free flame retardants. Magnesium hydroxide is widely used in polyvinyl chloride (PVC), polypropylene (PP) and other ), polyethylene (PE), vinyl acetate (EVA), polystyrene (PS), polyamide (PA) and other plastics, elastomers and rubber materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20C01F5/22
Inventor 陈同
Owner 青海艾特克盐湖科技有限公司