A kind of preparation method of ferric oxide/silicon dioxide composite powder with shell-core structure

A technology of triiron tetroxide and silicon dioxide, which is applied in the direction of iron oxide/iron hydroxide, ferrous oxide, inorganic material magnetism, etc., can solve the problem of high price, low grafting rate, poor thermal stability, etc. problems, to achieve the effect of increasing added value, expanding application fields, and improving dispersion capacity

Active Publication Date: 2017-01-18
江苏凯达石英股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For silane coupling agent modification, hexamethyldisilazane has the best treatment effect at present, but hexamethyldisilazane is expensive; for polymer graft polymerization modification, homopolymerization cannot be avoided The existence of reaction, so there will be a certain amount of homopolymer in the final system, and the grafting rate is not high; and the ester group in the esterification reaction is easy to hydrolyze, and the thermal stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve the iron salt in deionized water and stir with a magnetic stirrer until the iron salt is completely dissolved to make Fe 3+ A solution with a concentration of 0.01mol / L;

[0022] (2) Take silica powder and dissolve it in deionized water, add a dispersant to disperse it evenly by ultrasonic to make a slurry with a concentration of 0.01mol / L, then stir it with a strong mixer, and add a small amount of ammonia water to adjust pH in the range of 7;

[0023] (3) Add the solution prepared in step (1) to the fully stirred silica slurry at a speed of 0.02mol / s, and continue to stir vigorously for 40 minutes to obtain the coated silica precipitate;

[0024] (4) The precipitate obtained in step (3) was centrifuged, washed 3 times with deionized water, then washed 1 time with dehydrated ethanol, and finally put into an oven at 80°C to dry to obtain coated ferric hydroxide / Silica composite powder;

[0025] (5) Under the protection of inert gas argon, ferric oxide / ...

Embodiment 2

[0027] (1) Dissolve the iron salt in deionized water and stir with a magnetic stirrer until the iron salt is completely dissolved to make Fe 3+ A solution with a concentration of 0.015mol / L;

[0028] (2) Take silica powder and dissolve it in deionized water, add a dispersant to disperse it uniformly by ultrasonic to make a slurry with a concentration of 0.20mol / L, then stir it with a strong mixer, and add a small amount of ammonia water to adjust pH in the range of 7;

[0029] (3) Add the solution prepared in step (1) to the fully stirred silica slurry at a speed of 0.016mol / s, and continue to stir vigorously for 50 minutes to obtain the coated silica precipitate;

[0030] (4) Centrifuge the precipitate obtained in step (3), wash it with deionized water for 4 times, then wash it with dehydrated ethanol for 2 times, and finally put it in a 90°C oven to dry to obtain the coated ferric hydroxide / Silica composite powder;

[0031] (5) Under the protection of inert gas and nitr...

Embodiment 3

[0033] (1) Dissolve the iron salt in deionized water and stir with a magnetic stirrer until the iron salt is completely dissolved to make Fe 3+ A solution with a concentration of 0.02mol / L;

[0034] (2) Take silica powder and dissolve it in deionized water, add a dispersant to disperse it uniformly by ultrasonic to make a slurry with a concentration of 0.20mol / L, then stir it with a strong mixer, and add a small amount of ammonia water to adjust pH in the range of 8;

[0035] (3) Add the solution prepared in step (1) to the fully stirred silica slurry at a rate of 0.10 mol / s, and continue to stir vigorously for 80 minutes to obtain the coated silica precipitate;

[0036] (4) Centrifuge the precipitate obtained in step (3), wash it with deionized water for 5 times, then wash it with dehydrated ethanol for 2 times, and finally put it in an oven at 100°C to dry to obtain the coated ferric hydroxide / Silica composite powder;

[0037] (5) Under the protection of inert gas argon...

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Abstract

The invention discloses a preparation method of ferroferric oxide / silica composite powder of a shell-core structure. Silica powder is used as a core-covering matrix, ferric salt is used as a coating agent, a precipitation method is used for preparing a precursor of ferric hydroxide / silica, and the ferroferric oxide / silica composite powder is obtained after calcination. Ferroferric oxide is evenly coated on the surface of silica. The coating of the ferroferric oxide can effectively eliminate the hydroxyl group on the surface of the silica, and the dispersion ability is improved; the silica is enabled to be magnetic, the additional value of the silica is improved, and the application field is widened.

Description

technical field [0001] The invention relates to a surface modification technology of a silicon dioxide powder material, in particular to a preparation method of a shell-core structure iron ferric oxide / silicon dioxide composite powder. Background technique [0002] With the development of new material preparation technology towards microscopic refinement, the problem of powder agglomeration and dispersion has become a bottleneck in the preparation and development of new materials and ultrafine powder, and the modification technology of powder is becoming more and more important. [0003] Due to the polysiloxane inside the silica and the active hydroxyl groups on the outer surface and its water absorption, it is hydrophilic, difficult to wet and disperse in the organic phase, and has poor binding force with the organic matrix, which is easy to cause interface defects , so that the performance of the composite material is reduced; and because of the presence of hydroxyl groups...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/11C01G49/08
Inventor 张凤凯周兴平徐腾刘祥友张勋
Owner 江苏凯达石英股份有限公司
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