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Nano composite carbon/chromium trioxide powder and its prepn

A technology of chromium trioxide and nano-composite, which is applied in the field of inorganic composite materials, and can solve the problems that chemical precipitation method is difficult to achieve fine particle size and difficult to uniformly disperse.

Inactive Publication Date: 2003-09-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the adsorption effect of surfactants on the surface of chromium hydroxide particles, it is difficult to achieve fine particle size by chemical precipitation
The particle size of the chromium trioxide nanopowder obtained by these two methods is greater than 100nm, and there is agglomeration phenomenon between the particles, which makes it difficult to disperse uniformly in other matrix materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1) preparing 200mL of sulfuric acid solution containing 1% aniline and having a pH value of 0; 2) adding 1ppm polyethylene glycol to the aforementioned solution; 3) preparing 5.2mL of a solution containing 20% ​​chromium trioxide and 18% hydrochloric acid; 4 ) adding the chromium trioxide solution dropwise to the aniline solution, and strengthening the stirring, where the molar ratio of chromium trioxide to aniline is 0.5; 5) filtering the obtained precipitate and washing it with water; 6) soaking the precipitate in In 100mL of 1% ammonia water, stir for 2 hours; 7) filter and wash the precipitate obtained; 8) dry the precipitate to obtain polyaniline / chromium hydroxide nanocomposite powder; 9) polyaniline / hydroxide The chromium nanocomposite powder is placed in a nitrogen atmosphere and heated at a high temperature of 1000° C. for 10 hours to obtain a carbon / chromium trioxide nanocomposite powder.

Embodiment 2

[0013] 1) preparing 20mL of hydrochloric acid solution containing 10% aniline and having a pH value of 3; 2) adding 5ppm polyethylene glycol to the aforementioned solution; 3) preparing 64mL of a solution containing 10% sodium dichromate and 10% hydrochloric acid; 4 ) adding the sodium dichromate solution dropwise to the aniline solution, and strengthening the stirring, where the molar ratio of sodium dichromate to aniline is 1; 5) filtering the obtained precipitate and washing it with water; 6) washing the precipitate Soak in 50mL of 5% ammonia water, stir for 1 hour; 7) filter and wash the precipitate obtained; 8) dry the precipitate to obtain polyaniline / chromium hydroxide nanocomposite powder; 9) mix polyaniline / chromium hydroxide The chromium hydroxide nanocomposite powder is placed in a nitrogen atmosphere and heated at a high temperature of 1200° C. for 5 hours to obtain a carbon / chromium trioxide nanocomposite powder.

Embodiment 3

[0015] 1) Prepare 10 mL of hydrochloric acid solution containing 20% ​​aniline and a pH value of 1; 2) Add 10 ppm of polyethylene glycol to the aforementioned solution; 3) Prepare 1265 mL of a solution containing 1% potassium dichromate and 5% hydrochloric acid; 4 ) adding the potassium dichromate solution dropwise to the aniline solution, and strengthening stirring, where the molar ratio of potassium dichromate to aniline is 2; 5) filtering the obtained precipitate and washing it with water; 6) washing the precipitate Soak in 20mL of 10% ammonia water, stir for 0.1 hour; 7) filter and wash the precipitate obtained; 8) dry the precipitate to obtain polyaniline / chromium hydroxide nanocomposite powder; 9) mix polyaniline / chromium hydroxide The chromium hydroxide nanocomposite powder is placed in a nitrogen atmosphere, and heated at a high temperature of 1500° C. for 1 hour to obtain a carbon / chromium trioxide nanocomposite powder.

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Abstract

The present invention relates to nano composite carbon / chromium trioxide powder and its preparation. Polyaniline is oxide with hexad chromium compound to form the mixture precipitate of polyaniline and chromium hydroxide; the mixture precipitate is washed and dried to obtain nano composite polyaniline / chromium hydroxide powder; and under air isolating condition, the nano composite polyaniline / chromium hydroxide powder is heated to high temperature to obtain the nano composite carbon / chromium trioxide powder with carbon coating the nano chromium trioxide particle. The nano composite carbon / chromium trioxide powder of the present invention has small particle size and raised use effect as antiwear additive and is suitable for large-scale production.

Description

Technical field: [0001] The invention relates to a carbon / chromium trioxide nanocomposite powder and a preparation method thereof, belonging to the technical field of inorganic composite materials in materials. Background technique: [0002] Chromium trioxide (also known as chromium oxide) nano powder is a wear-resistant additive, which is used to improve the surface wear resistance of plastics, rubber and other materials. At present, the methods for preparing chromium trioxide nanopowder can be divided into two types, mechanical ball milling method and chemical precipitation method. The mechanical ball milling method is to mechanically pulverize commercial chromium trioxide with a micron size to a nanometer size. Due to the high hardness and wear resistance of chromium trioxide, it is difficult to achieve a fine particle size by mechanical means, and the energy consumption is high and the wear of the appliance is large. In the chemical precipitation method, under the prot...

Claims

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Application Information

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IPC IPC(8): C08K3/22
Inventor 廖川平顾明元
Owner SHANGHAI JIAO TONG UNIV
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