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Method for preparing nano far infrared powder in Al2O3 vacant spinel type

A nano-far-infrared powder and spinel-type technology, which is applied in the field of preparation of nano-far-infrared powder, can solve the problems of great influence on powder emissivity performance, large particles, and high cost, and achieve good health care effects and preparation The effect of simple process and low product cost

Inactive Publication Date: 2006-10-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The commonly used far-infrared powders are micron-sized, with large particles, low emissivity, and weak adhesion to health care fabrics; the preparation of multi-component nanopowders usually uses sol-gel technology and co-precipitation technology
The sol-gel process uses aluminum alkoxide as raw material, which is expensive and has few varieties; while the nano-powder particles obtained by the general co-precipitation process are easy to agglomerate and unevenly distributed. If ethanol dehydration is used to prevent agglomeration, the cycle is long and the cost is high. ; In addition, the chemical and crystal phase composition of the powder have a great influence on the emissivity performance of the powder, which requires a stable control technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In the beaker, add 350ml of Al(OH) with a concentration of 1.6mol / L x Precursor suspension, then add 2.5g PEG 1000 , heated to 40°C, then slowly added 100ml of water glass solution with a concentration of 0.4mol / L, continued heating and stirring for 0.5 hours to make a uniform mixed suspension. Then acidify the mixed suspension with 5N dilute hydrochloric acid solution, stir to adjust and keep the pH at 6, keep it warm at 40°C for 0.5 hours, and continue to stir to make Si(OH) x The precipitation reaction proceeds sufficiently to obtain Si(OH) x Coated Al(OH) x The reaction suspension (about 500ml) of the precursor; the reaction solution is vacuum filtered, and the obtained filter cake is washed 4 times with deionized water, and the water consumption is about 1 / 2 of the reaction solution; Add 1.5g of emulsifier TX-10 to the cake, dry at 100±20°C, dry-mill the dried product with a particle ball mill for 0.5 hours; calcinate at 800°C for 0.5 hours to obtain more than 5...

Embodiment 2

[0017] In the beaker, add 350ml of Al(OH) with a concentration of 1.6mol / L x Precursor suspension, then add 1.5g PEG 1540 , heated to 42°C, then slowly added 100ml of water glass solution with a concentration of 0.4mol / L, continued heating and stirring for 0.5 hours to make a uniform mixed suspension. Then acidify the mixed suspension with 5N dilute hydrochloric acid solution, stir to adjust and keep the pH at 7, keep it warm at 42°C for 0.5 hours, and continue to stir to make Si(OH) x The precipitation reaction proceeds sufficiently to obtain Si(OH) x Coated Al(OH) x The reaction suspension (about 500ml) of the precursor; the reaction solution is vacuum filtered, and the obtained filter cake is washed 6 times with deionized water, and the water consumption is about 1 / 2 of the reaction solution; Add 1.0g of emulsifier TX-10 to the cake, dry at 100±20°C, dry-mill the dried product with a particle ball mill for 1 hour; calcinate at 900°C for 0.5 hour to obtain more than 50g o...

Embodiment 3

[0019] In the beaker, add 350ml of Al(OH) with a concentration of 1.8mol / L x Precursor suspension, then add 2.5g PEG 1540 , heated to 40°C, then slowly added 100ml of water glass solution with a concentration of 0.45mol / L, continued heating and stirring for 0.5 hours to make a uniform mixed suspension. Then acidify the mixed suspension with 6N dilute hydrochloric acid solution, stir to adjust and keep the pH at 6, keep it warm at 40°C for 0.5 hours, and continue to stir to make Si(OH) x The precipitation reaction proceeds sufficiently to obtain Si(OH) x Coated Al(OH) x The reaction suspension (about 500ml) of the precursor; the reaction solution is vacuum filtered, and the obtained filter cake is washed 6 times with deionized water, and the water consumption is about 1 / 2 of the reaction solution; Add 1.5g of emulsifier Span-60 to the cake, dry at 100±20°C, dry-mill the dried product with a particle ball mill for 0.5 hours; calcinate at 700°C for 0.5 hours to obtain more tha...

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PUM

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Abstract

The invention discloses an Al 2 O 3 Preparation method of vacant spinel nano far-infrared powder, Al(OH) x The precursor and distilled water are prepared into a suspension with a concentration of 1.6 to 2.0 mol / L, and Al is added to it 2 O 3 2-5wt% dispersant; add the pre-prepared water glass solution to the above-mentioned precursor suspension to make a uniform mixed suspension; acidify the mixed suspension with dilute hydrochloric acid solution, and adjust its pH value to keep at 6-9 , making Si(OH) x The precipitation is deposited on the surface of the precursor particles; the suspension is filtered under reduced pressure, and the filter cake is rinsed with deionized water; a surface treatment agent is added to it, dried, pulverized, and calcined to obtain Al 2 O 3 powder. The invention has the advantages of simple process, wide source of raw materials, low product cost, good dispersibility and strong adhesion to fabric fibers.

Description

technical field [0001] The present invention relates to a kind of preparation method of nanometer far-infrared powder, relate to a kind of preparation Al more specifically 2 o 3 A method for vacancy spinel-type high-performance nanometer far-infrared powder. Background technique [0002] The commonly used far-infrared powders are micron-sized, with large particles, low emissivity, and weak adhesion to health care fabrics; the preparation of multi-component nanopowders usually uses sol-gel technology and co-precipitation technology. The sol-gel process uses aluminum alkoxide as raw material, which is expensive and has few varieties; while the nano-powder particles obtained by the general co-precipitation process are easy to agglomerate and unevenly distributed. If ethanol dehydration is used to prevent agglomeration, the cycle is long and the cost is high. ; In addition, the chemical and crystal phase composition of the powder have a great influence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/16C04B35/443C04B35/628
Inventor 徐明霞季惠明梁辉
Owner TIANJIN UNIV