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Preparation method low electric conductiving super fine aluminium hydroxide micro powder

An ultra-fine aluminum hydroxide, low conductivity technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve problems such as poor dispersion, increased material viscosity, electrical breakdown, etc. Achieve the effect of broadening the application field, improving the processing performance, and improving the electrostatic effect

Active Publication Date: 2005-03-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compatibility with organic substances is relatively poor, so when a large amount of filling is added to polymer materials such as resins, it is easy to cause the viscosity of the material to increase, resulting in poor processing performance, poor dispersion, and easy electrical breakdown, which limits the ultra-fine hydrogen The amount of alumina fine powder is added, and it cannot be used in organic polymer materials with relatively high insulation requirements

Method used

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  • Preparation method low electric conductiving super fine aluminium hydroxide micro powder

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Effect test

Embodiment 1

[0017] The sodium aluminate solution is desiliconized and purified, the silicon content index is 700, and the float is 0.02%. At a temperature of 54°C, add mechanically ground active seeds with a seed coefficient of 10%, and control the temperature at 55°C. Decompose, wash after decomposing for 3 hours, wash with distilled water until the total alkali concentration NaO is 0.05g / L, filter until the water content of the filter cake is 30%, and then carry out intensive drying, breaking up and grading. The obtained product is ultrafine aluminum hydroxide micropowder with a D50 of 0.5-0.7 μm in the crystal form of α-gibbsite, and a resistivity of 140 μS / cm.

Embodiment 2

[0019] The sodium aluminate solution is desiliconized and purified, the silicon content index is 650, and the float is 0.02%. At a temperature of 61°C, add mechanically ground active seeds with a seed crystal coefficient of 4%, and control the temperature at 61°C. Decompose, wash after decomposing for 5 hours, wash with distilled water until the total alkali concentration NaO is 0.05g / L, filter until the water content of the filter cake is 25%, and then carry out intensive drying, breaking up and grading. The obtained product is ultrafine aluminum hydroxide micropowder with a D50 of 0.7-1.0 μm in the crystal form of α-gibbsite, and a resistivity of 110 μS / cm.

Embodiment 3

[0021] The sodium aluminate solution is desiliconized and purified, the silicon content index is 640, and the floating matter is 0.02%. At a temperature of 68°C, add mechanically ground active seeds with a seed crystal coefficient of 12%, and control the temperature at 68°C. Decompose, wash after decomposing for 6 hours, wash with distilled water until the total alkali concentration NaO is 0.05g / L, filter until the water content of the filter cake is 24%, and then carry out intensive drying, breaking up and grading. The obtained product is ultrafine aluminum hydroxide micropowder with a D50 of 1.2-1.8 μm in the crystal form of α-gibbsite, and a resistivity of 90 μS / cm.

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Abstract

A process for preparing superfine aluminium hydroxide powder with low electric conductivity includes such steps as desiliconizing the solution of sodium aluminate, adding crystal seeds, decomposing, filtering, washing the filtered cake, refiltering, and baking.

Description

technical field [0001] The invention discloses a method for preparing ultra-fine aluminum hydroxide with low conductivity, relating to a method for preparing aluminum hydroxide powder with low conductivity used as a flame retardant and an insulating material. Background technique [0002] Ultrafine aluminum hydroxide micropowder has three functions of flame retardant, smoke elimination and filling because of its extremely fine particles. Adding this product to advanced composite materials such as plastics and rubber can not only make the product flame retardant, self-absorbing, smoke extinguishing It is widely used in cables, insulators, thermoplastic materials, electrical and electrical equipment, plastics, rubber and other industries as additives, and is internationally recognized as a pollution-free and environmentally friendly resistor. Combustion agent, there is a large amount of consumption every year. Due to the extremely fine particle size, large specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04C01F7/14
Inventor 朱德学刘春利冯晓明刘杰成石保利王敬伟刘骞王智锦
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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