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Preparation method of high-dispersion superfine aluminium hydroxide

A technology of ultra-fine aluminum hydroxide and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc. The application performance of products is deteriorated, and the effect of high dispersion performance, improved processing performance and reduction of agglomerates can be achieved.

Inactive Publication Date: 2016-01-27
JINAN TAIXING FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the finer the particle size of the powder, the larger its specific surface, it is easy to agglomerate to form agglomerates, and the structure of the agglomerates is not easy to be destroyed during the application and processing of the powder, resulting in uneven filling or admixture and poor product application performance. become worse, so that the quality of its products becomes lower; at the same time, it limits the amount of ultra-fine aluminum hydroxide

Method used

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  • Preparation method of high-dispersion superfine aluminium hydroxide
  • Preparation method of high-dispersion superfine aluminium hydroxide
  • Preparation method of high-dispersion superfine aluminium hydroxide

Examples

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Embodiment 1

[0015] A method for preparing highly dispersed ultrafine aluminum hydroxide, using 100 parts of sodium metaaluminate solution with an alumina content of 235g / L and a solution caustic ratio of αK=1.52 as raw material, at a reaction temperature of 65°C, adding 1.5 Add 1.2 parts of sodium citrate to 1 part of wet-ground seed crystals, stir and react for 8 hours, then carry out solid-liquid separation, washing, drying and impact milling for the resulting slurry. The frequency of the impact mill host is 40HZ, and the frequency of the classifier 35HZ, and finally get ultra-fine powder aluminum hydroxide for packaging, product particle size D 100 7um, the SEM photo of the product is attached figure 2 .

Embodiment 2

[0017] A method for preparing highly dispersed ultrafine aluminum hydroxide, using 100 parts of sodium metaaluminate solution with an alumina content of 220g / L and a solution caustic ratio of αK=1.60 as a raw material, adding 2 Add 2 parts of oleic acid amide to 1 part of wet-ground seed crystals, stir and react for 10 hours, then carry out solid-liquid separation, washing, drying and impact milling to disperse the obtained slurry. The frequency of the impact mill host is 30HZ, and the frequency 25HZ, and finally get superfine powder aluminum hydroxide for packaging, product particle size D 100 It is 8.5um, the SEM photo of the product is attached image 3 .

Embodiment 3

[0019] A method for preparing highly dispersed ultrafine aluminum hydroxide, using 100 parts of sodium metaaluminate solution with an alumina content of 260 g / L and a solution caustic ratio of αK = 1.42 as raw material, at a reaction temperature of 55°C, adding 0.75 Add 1.2 parts of silane A151 to 1 part of wet-grinding seed crystals, stir and react for 11 hours, then carry out solid-liquid separation, washing, drying and impact milling to disperse the obtained slurry. 45HZ, finally get ultra-fine powder aluminum hydroxide for packaging, product particle size D 100 6.5um, the product SEM photo is attached Figure 4 .

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Abstract

The invention provides a preparation method of high-dispersion superfine aluminium hydroxide. Superfine aluminium hydroxide is finally obtained by adding seed crystals and dispersion modifier at the same time at a certain reaction temperature with a sodium metaaluminate solution as the raw material, conducting stirring for a certain period of time, and conducting solid-liquid separation, washing, drying and dispersing on obtained pulp, wherein D50 is equal to 0.8-2 micrometers, and D100 is smaller than 10 micrometers. By means of the method, agglomeration of superfine aluminium hydroxide powder is effectively reduced, aggregate in finished products is reduced, the processing performance of high-dispersion superfine aluminium hydroxide is effectively improved, and the high-dispersion superfine aluminium hydroxide can be used for inflaming retarding or filling of wires, cables, rubber, plastic, papermaking, electric insulation and the like.

Description

technical field [0001] The invention relates to a preparation method of highly dispersed ultra-fine aluminum hydroxide, which can be used for flame retardancy or filling of electric wires and cables, rubber, plastics, papermaking, electrical insulating parts and the like. Background technique [0002] Due to its extremely fine particles, ultra-fine aluminum hydroxide has three functions of flame retardant, smoke elimination and filling. As a high-grade flame retardant filler, it is widely used in electrical, In addition to the smoke effect, the leakage resistance, arc resistance and wear resistance of the product have been significantly improved. [0003] Since the finer the particle size of the powder, the larger its specific surface, it is easy to agglomerate to form agglomerates, and the structure of the agglomerates is not easy to be destroyed during the application and processing of the powder, resulting in uneven filling or admixture and poor product application perfor...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 杜廷文段金凤李宜升明宝义李绍文
Owner JINAN TAIXING FINE CHEM
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