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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 uneven dispersion, unsatisfactory effect, coarse particle size, etc., achieve heat-resistant decomposition temperature increase, avoid local excessive reaction, particle size and dispersion sex improvement effect

Active Publication Date: 2006-10-11
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 materials

[0014] NT

AI2O3

NK

115

100

93

[0015] Mg 2+

SO4 2-

CL-

52.52g / l

17.5g / l

60g / l

[0016] 2. Control process conditions:

[0017] The reaction temperature is 20℃, the stirring time is 30 minutes, and the molar ratio of Mg2+ to caustic alkali is 1:2

[0018] 3. Technical and economic indicators

[0019] Product composition: 6Mg(OH) 2 .2AI 2 (OH) 3 .4.5H 2 O, thermal decomposition temperature 250℃, product particle size 20~40μm

Embodiment 2

[0021] 1. Raw materials

[0022] NT

AI2O3

NK

115

120

100

[0023] Mg 2+

SO4 2-

CL-

52.52g / l

17.5g / l

60g / l

[0024] 2. Control process conditions:

[0025] The reaction temperature is 40℃, the stirring time is 20 minutes, and the molar ratio of Mg2+ to caustic is 1:4

[0026] 3. Technical and economic indicators

[0027] Product composition: 2Mg(OH) 2 .AI 2 (OH) 3 .2H 2 O, thermal decomposition temperature 260℃, product particle size 10~30μm

Embodiment 3

[0029] 1. Raw materials

[0030] NT

AI2O3

NK

180

150

160

[0031] Mg 2+

SO4 2-

CL-

52.52g / l

17.5g / l

60g / l

[0032] 2. Control process conditions:

[0033] The reaction temperature is 80℃, the stirring time is 60 minutes, and the molar ratio of Mg2+ to caustic alkali is 1:9

[0034] 3. Technical and economic indicators

[0035] Product composition: 3.5Mg(OH) 2 .2AI 2 (OH) 3 .1.5H 2 O, thermal decomposition temperature is 255°C, product particle size is 20-60μm.

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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 chemical method for preparing aluminum hydroxide and magnesium hydroxide composite flame retardant, relates to a preparation method for plastic flame retardant additives, in particular, a preparation method of aluminum hydroxide and magnesium hydroxide composite flame retardant . 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 needs of certain materials. The dehydration temperature of aluminum hydroxide is relatively low, which is likely to cause foaming. In most cases, high-efficiency composite flame retardants (mainly aluminum hydroxide) are used, whose oxygen index is higher than when used alone, and aluminum hydroxide and magnesium hydroxide are organically combined through a certain method. Make it have the dual characteristics of aluminum hydroxide and magnesium hydroxide at the same time...

Claims

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Application Information

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Patent Type & Authority Applications(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