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A method for enhancing heat resistance of ultrafine ultrawhite aluminum hydroxide micropowder

A technology of aluminum hydroxide and micropowder, used in alumina/aluminum hydroxide, chemical instruments and methods, aluminum compounds, etc., can solve the problems of heat resistance limit, poor compatibility, high heat history, etc., and improve the activation index. , the effect of enhancing activity and improving heat resistance

Active Publication Date: 2021-06-04
贵州博汇联润铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, most of the dry processing of aluminum hydroxide is used to achieve the effect of preheating, and in the dry processing process, it includes adding a reaction delay agent for coating, and the coating of the reaction delay agent If the aluminum hydroxide powder is covered, it will easily lead to changes in the physical properties of the aluminum hydroxide powder, resulting in poor compatibility; and after research, even if the treatment scheme of adding a reaction delay agent is not used, and the heating pre-dehydration method is used, it will bring new problems. The problem is that the surface defects of the aluminum hydroxide powder will increase, and while suppressing the surface defects of the aluminum hydroxide, it is necessary to apply a high thermal history, so that there is a limit to the improvement of the heat resistance by heating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use supersaturated sodium aluminate aqueous solution, add aluminum hydroxide and water to the aqueous solution and mix them in an equal mass ratio, operate according to the cell mill grinding operation method, and after grinding for 5 hours, the resulting temperature is 50-70°C The method of microwave radiation treatment to constant weight, that is, the method of obtaining aluminum hydroxide powder with an average particle size of 0.5-15 μm, the prepared aluminum hydroxide powder is used as a seed crystal, crystallized, and the filter cake obtained by filtration is used as a raw material for aluminum hydroxide powder.

[0024] 100 parts by weight of aluminum hydroxide micropowder is dissolved in hot water to form a dispersed liquid, adding 0.005 times the weight of aluminum fluoride and active seed crystals accounting for 0.03% by mass of aluminum fluoride, stirring and mixing evenly, filtering, washing, and drying at 70 °C drying to constant weight.

[0025] The heat r...

Embodiment 2

[0027] 100 parts by weight of the aluminum hydroxide micropowder used in Example 1 was dissolved in hot water to form a dispersed liquid, and 0.001 times the weight of aluminum fluoride and an active seed crystal accounting for 0.01% by mass of aluminum fluoride were added, and stirred and mixed evenly Afterwards, filter, wash, and dry at 50° C. to a constant weight step. The heat resistance measurement of aluminum hydroxide micropowder after being processed according to above-mentioned measuring method, its result is as shown in table 1.

Embodiment 3

[0029] 100 parts by weight of the aluminum hydroxide micropowder used in Example 1 was dissolved in hot water to form a dispersed liquid, and 0.003 times the weight of aluminum fluoride and an active seed crystal accounting for 0.02% by mass of aluminum fluoride were added, and the mixture was evenly mixed Afterwards, filter, wash, and dry at 60° C. to a constant weight step. The heat resistance measurement of aluminum hydroxide micropowder after being processed according to above-mentioned measuring method, its result is as shown in table 1.

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Abstract

The invention relates to the technical field of improving the performance of aluminum hydroxide micropowder, in particular to a method for enhancing the heat resistance of ultrafine ultrawhite aluminum hydroxide micropowder. After dissolving the aluminum hydroxide micropowder in hot water, adding aluminum fluoride and active crystal seeds, Filter and wash, and dry at 50-70°C to constant weight, so that the aluminum fluoride component and aluminum hydroxide powder are recrystallized and fused, and then dried at low temperature to dehydrate to constant weight, which not only improves the heat resistance of aluminum hydroxide powder, It also enhances the activity of aluminum hydroxide micropowder and improves the activation index.

Description

technical field [0001] The invention relates to the technical field of performance improvement of aluminum hydroxide micropowder, in particular to a method for enhancing the heat resistance of ultrafine superwhite aluminum hydroxide micropowder. Background technique [0002] Aluminum hydroxide micropowder is widely used in flame retardant, filler and other fields; currently, the preparation of aluminum hydroxide micropowder is obtained by decomposing sodium aluminate solution to obtain aluminum hydroxide slurry, which is then separated by a filter and washed twice with hot water. . For the application process of aluminum hydroxide micropowder in the flame retardant field, the mechanism that the water contained in the aluminum hydroxide micropowder crystallization will be dehydrated due to heating is used, so that the flame retardant that can impart flame retardancy to the resin is used, so , for enhancing the heat resistance of aluminum hydroxide micropowder, it will help t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/021C01F7/023C01P2004/61C01P2004/62C01P2006/12C01P2006/32
Inventor 刘俊良刘荣心姚亮
Owner 贵州博汇联润铝业有限公司
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