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Method for preparing magnesium hydroxide fire retardant and prepared magnesium hydroxide fire retardant

A technology of magnesium hydroxide and flame retardant, which is applied in the treatment of dyed organic silicon compounds and fibrous fillers. It can solve the problems of small addition, poor compatibility of resin matrix, and great influence on the mechanical strength of materials, so as to prevent agglomeration , the effect of improving compatibility

Inactive Publication Date: 2011-04-13
凤城市联诚科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary magnesium hydroxide is often flocculent precipitates or amorphous particles, the crystals are often flakes and needles, the specific surface area is large, and there is a strong secondary agglomeration between the grains, resulting in poor dispersion in the resin. The compatibility with the resin matrix is ​​poor. As a flame retardant filler, the flame retardant performance cannot meet the requirements if the addition amount is small, and the large addition amount has a great impact on the mechanical strength of the material, and even deteriorates the processing performance of the entire polymer mixture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (2) Weigh stearic acid with a concentration of 1%, acrylic monomer with a concentration of 2%, lauric acid with a concentration of 2% and catalyst with a concentration of 1% in a beaker, and use absolute ethanol as the medium for Solution B was prepared by ultrasonic dispersion;

[0021] (3) 1kg of fully dried Mg(OH) 2 Put the powder into a high-speed mixer, preheat to 60°C at 600r / min, first add solution A to Mg(OH) under stirring 2 In the powder, stir and modify at 800r / min for 0.5h; then add solution B for continuous mechanical stirring, and polymerize at 60°C for 1h, so that the modified Mg(OH) 2 The powder is evenly coated on the surface of magnesium hydroxide;

[0022] (4) Finally, the reactant was dried at 80°C to obtain a polymer graft-coated magnesium hydroxide flame retardant.

[0023] Example 2:

Embodiment 2

[0025] (2) Weigh stearic acid with a concentration of 6%, acrylic monomer with a concentration of 7%, lauric acid with a concentration of 6% and catalyst with a concentration of 1% in a beaker, and use absolute ethanol as the medium for Solution B was prepared by ultrasonic dispersion;

[0026] (3) 10kg of fully dried Mg(OH) 2 Put the powder into a high-speed mixer, preheat to 90°C at 600r / min, first add solution A to the Mg(OH) under stirring state twice 2 In the powder, the time interval between two times is 5min, and the mass added each time is 50% of the total mass of solution A, and stirred and modified at 1200r / min for 5h; then add solution B for mechanical stirring, and polymerize at 90°C Reaction 7h, make the modified Mg(OH) 2 The powder is evenly coated on the surface of magnesium hydroxide;

[0027] (4) Finally, the reactant was dried at 105 °C to obtain a polymer graft-coated magnesium hydroxide flame retardant.

[0028] Example 3:

Embodiment 3

[0030] (2) Weigh stearic acid with a concentration of 3%, acrylic monomer with a concentration of 4%, lauric acid with a concentration of 3% and catalyst with a concentration of 1% in a beaker, and use absolute ethanol as the medium for Solution B was prepared by ultrasonic dispersion;

[0031] (3) 5kg of fully dried Mg(OH) 2 Put the powder into a high-speed mixer, preheat to 70°C at 600r / min, first add solution A to the Mg(OH) under stirring state twice 2 In the powder, the time interval between two times is 20min, the mass added each time is 50% of the total mass of solution A, and stirred and modified at 1000r / min for 2h; then add solution B and continue to mechanically stir, at 70 ℃ polymerization reaction for 3h, the modified Mg(OH) 2 The powder is evenly coated on the surface of magnesium hydroxide;

[0032] (4) Finally, the reactant was dried at 100 °C to obtain a polymer graft-coated magnesium hydroxide flame retardant.

[0033] Example 4:

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Abstract

The invention relates to a method for preparing a magnesium hydroxide fire retardant and a prepared magnesium hydroxide fire retardant. The preparation method is as follows: preparing a silane coupling agent into petroleum ether or an aqueous solution A; taking stearic acid, crylic acid monomers, lauric acid and a catalyst, and using absolute ethyl alcohol as a medium to prepare a solution B; andputting the solution A and the solution B in Mg(OH)2 powder for polymerization to obtain the magnesium hydroxide fire retardant coated by grafted polymers, wherein the mass fraction of Mg(OH)2 is 98.0-98.5%, the average particle diameter of the fire retardant is 1-100mu m, and the BTE (Brunauer-Emmett-Teller) specific surface area is 1-5.0m<2> / g. By using the method, the compatibility of the magnesium hydroxide fire retardant and the resin matrix can be improved, and the filling use amount is increased. The dispersion and compatibility of the magnesium hydroxide in a polymer matrix are greatly improved and the antiflaming and mechanical property requirements of a polymer material are met.

Description

technical field [0001] The invention relates to a preparation method of a flame retardant and a flame retardant obtained according to the method. Background technique [0002] Ordinary magnesium hydroxide is often flocculent precipitates or amorphous particles, the crystals are often flakes and needles, the specific surface area is large, and there is a strong secondary agglomeration between the grains, resulting in poor dispersion in the resin. The compatibility with the resin matrix is ​​poor. As a flame retardant filler, the flame retardant performance cannot meet the requirements if the addition amount is small, and the large addition amount has a great impact on the mechanical strength of the material, and even deteriorates the processing performance of the entire polymer mixture. Magnesium hydroxide whiskers are fine single-crystal fibers with a diameter of nanometer size. They have excellent physical and chemical properties and can overcome the defects of ordinary mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/12C08K9/10C08K3/22C08L23/00
Inventor 张爱玲王松李三喜梁吉艳
Owner 凤城市联诚科技新材料有限公司
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