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Method for chemical preparation of aluminium hydroxide and magnesium hydroxide composite flame-retardant agent

A composite flame retardant, aluminum hydroxide technology, applied in the direction of fire-resistant coatings, etc., can solve the problems of coarse particle size, unsatisfactory effect, uneven dispersion, etc., achieve heat-resistant decomposition temperature increase, avoid local excessive reaction, particle size and dispersion sex improvement effect

Active Publication Date: 2008-07-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1980s, the method of mixing and grinding aluminum hydroxide and magnesium hydroxide solids has been widely used to combine them together by mechanical force. The method is simple and easy to obtain, but its particle size is coarse and the dispersion is uneven, so the effect is not good. ideal

Method used

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  • Method for chemical preparation of aluminium hydroxide and magnesium hydroxide composite flame-retardant agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Raw material

[0014] (1) Sodium aluminate solution composition: (g / l)

[0015] NT

Al 2 o 3

NK

115

100

93

[0016] (2) Composition of magnesium salt solution

[0017] Mg 2+

SO4 2-

Cl-

52.52g / l

17.5g / l

60g / l

[0018] 2. Control process conditions:

[0019] Reaction temperature 20°C, stirring time 30 minutes, Mg 2+ The molar ratio to caustic is 1:2

[0020] 3. Technical and economic indicators

[0021] Product composition: 6Mg(OH) 2 .2Al 2 (OH) 3 .4.5H 2 O, thermal decomposition temperature 250℃, product particle size 20~40μm

Embodiment 2

[0023] 1. Raw material

[0024] (1) Sodium aluminate solution composition: (g / l)

[0025] NT

Al 2 o 3

NK

115

120

100

[0026] (2) Composition of magnesium salt solution

[0027] Mg 2+

SO4 2-

Cl-

52.52g / l

17.5g / l

60g / l

[0028] 2. Control process conditions:

[0029] Reaction temperature 40°C, stirring time 20 minutes, Mg 2+ The molar ratio to caustic is 1:4

[0030] 3. Technical and economic indicators

[0031] Product composition: 2Mg(OH) 2 .Al 2 (OH) 3 .2H 2 O, thermal decomposition temperature 260℃, product particle size 10~30μm

Embodiment 3

[0033] 1. Raw material

[0034] (1) Sodium aluminate solution composition: (g / l)

[0035] NT

Al 2 o 3

NK

180

150

160

[0036] (2) Composition of magnesium salt solution

[0037] Mg 2+

SO4 2-

Cl-

52.52g / l

17.5g / l

60g / l

[0038] 2. Control process conditions:

[0039] Reaction temperature 80°C, stirring time 60 minutes, Mg 2+ The molar ratio to caustic is 1:9

[0040] 3. Technical and economic indicators

[0041] Product composition: 3.5Mg(OH) 2 .2Al 2 (OH) 3 .1.5H 2 O, the thermal decomposition temperature is 255°C, and the product particle size is 20-60 μm.

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Abstract

A chemical method for preparation of complexing flame retardant of aluminum hydroxide and magnesium hydrate relates to a method for preparation of addition agent which can be used in flame retardant of plastics, which is characterized in that: in sodium aluminate solution with 100- 200g / l of di-iron trioxide concentration and alpha k of 1.40-1.65, adding magnesium salts (addex-magnesium and magnesium chloride) with a mole ratio of 1:1.5-1:10 with caustic alkali in sodium aluminate solution, at 20-80 DEG C, stirring and reacting for 10-60 min, then adding flocculating anhydrating agent, filtering to obtain solid materials; then adding dispersing agent, by pulping filtration, scouring and drying to obtain powdery aluminum hydroxide and magnesium hydrate.

Description

technical field [0001] A method for chemically preparing aluminum hydroxide and magnesium hydroxide composite flame retardants, relating to a preparation method for plastic flame retardant additives, especially a preparation method for aluminum hydroxide and magnesium hydroxide composite flame retardants . Background technique [0002] With the vigorous development of the plastics industry, single aluminum hydroxide and magnesium hydroxide as flame retardants can no longer meet the high-temperature flame-retardant requirements of some materials. The dehydration temperature of aluminum hydroxide is low, which is easy to cause foaming. In most cases, it is necessary to use a high-efficiency composite flame retardant (mainly aluminum hydroxide), whose oxygen index is higher than that when used alone, and combine aluminum hydroxide and magnesium hydroxide organically by a certain method. Make it have the dual characteristics of aluminum hydroxide and magnesium hydroxide at the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/02C08K3/22
Inventor 张立强李光柱李文化赵培生杨金妮高晓辉张爱贤杨红菊郭晋梅吕鲜翠唐海红焦淑红独翔
Owner GUIZHOU BRANCH CHINA ALUMINUM IND