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Composite powder coated with polyaniline and preparation method thereof

A technology of composite powder and polyaniline, which is applied in the field of polyaniline-coated composite powder and its preparation, and can solve the problems of density limitation and application

Inactive Publication Date: 2011-11-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Both elemental iron and iron nitride are excellent magnetic materials and electromagnetic wave absorbing materials. They have the advantages of high composite magnetic permeability and good chemical stability, but their high density limits their application in wave-absorbing coatings or anti-corrosion coatings.

Method used

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  • Composite powder coated with polyaniline and preparation method thereof
  • Composite powder coated with polyaniline and preparation method thereof
  • Composite powder coated with polyaniline and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0012] The steps of the preparation method of the polyaniline-coated composite powder are as follows:

[0013] 1) Add carbon materials such as carbon fiber, carbon black, activated carbon, carbon nanotubes to the aqueous solution of ferric nitrate or ethanol solution, take out after fully soaking, and the surface of the carbon material will fully absorb ferric nitrate after drying.

[0014] 2) Put the product of step 1) into the furnace and heat it to 450~750°C in a nitrogen / hydrogen atmosphere o C; at this time, the iron nitrate on the surface of the carbon material will decompose into Fe 2 o 3 And it is reduced to elemental iron by hydrogen. React for 15-60 minutes to change the atmosphere in the furnace to ammonia gas, keep the furnace temperature and continue to react for 15-60 minutes. The elemental iron on the surface of the carbon material will partially react with the ammonia gas to form iron nitride, so that the surface of the carbon material is coated in turn. Com...

Embodiment 1

[0020] Embodiment 1: Using carbon fiber as raw material

[0021] 1) Take 10 g of carbon fiber, add it to 50 mL of ferric nitrate aqueous solution, take it out after fully adsorbed, 60 o Dry under C conditions;

[0022] 2) Move the product of step 1) into the furnace and heat it to 450 in a nitrogen / hydrogen atmosphere o C, switch the atmosphere to ammonia after 15 minutes of reaction, and keep the furnace temperature to continue the reaction for 60 minutes;

[0023] 3) Add water to the product of step 2) to make a suspension with a mass concentration of 5%, and add 0.5 g of aniline to the suspension; under constant stirring, add a solution of p-benzenesulfonic acid with a solute mass of 0.2 g; stir After uniformity, slowly drop into the sodium persulfate solution with a solute mass of 0.2 g, react at room temperature for 6 h, and keep stirring during this period. After the reaction is completed, the polyaniline-coated composite powder is obtained after filtering, washing an...

Embodiment 2

[0024] Example 2: Using hollow carbon fiber as raw material

[0025] 1) Take 10 g of hollow carbon fiber, add it to 250 mL of ferric nitrate ethanol solution, take it out after fully adsorbed, 150 o Dry under C conditions;

[0026] 2) Move the product of step 1) into the furnace and heat it to 750°C in a nitrogen / hydrogen atmosphere o C, after 60 minutes of reaction, switch the atmosphere to ammonia, and keep the furnace temperature to continue the reaction for 15 minutes;

[0027] 3) Add water to the product of step 2) to make a suspension with a mass concentration of 15%, and add 5 g of aniline to the suspension; under the condition of constant stirring, add a solute mass of 10 g of camphorsulfonic acid solution; stir evenly Afterwards, potassium dichromate solution with a mass of 7 g of solute was slowly added dropwise, and reacted at room temperature for 24 h, stirring continuously during this period. After the reaction is completed, the polyaniline-coated composite pow...

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Abstract

The invention discloses polyaniline coated composite powder and a preparation method thereof. The composite powder comprises three parts, namely a core layer made of a carbon material, an interlayer made of monomer iron nano particles and iron nitride, and a coating layer made of a polyaniline thin film. The preparation method comprises the following synthesis steps: allowing the carbon material to fully absorb solution of ferric nitrate, and coating the monomer iron particles and the iron nitrate by hydrogen reduction and amination respectively; and finally, coating the polyaniline on the outside layer of the product of the amination by using in-situ polymerization technology, and thus obtaining the polyaniline coated composite powder. The powder has both the conductive and anticorrosionperformance of the polyaniline and the magnetic and catalytic performance of iron magnetic particles; the raw materials of the composite powder are widely available and the process flow of the composite powder is simple; and the composite powder has a bright application prospect in fields of electromagnetic wave shielding, metal corrosion resistance, treatment of refractory waste water, plastic rubber additive and the like.

Description

technical field [0001] The invention relates to a polyaniline-coated composite powder and a preparation method thereof. Background technique [0002] Polyaniline (PANI) is a typical conductive polymer because of its diverse structure, high electrical conductivity, unique doping mechanism, excellent physical properties, good environmental stability, and cheap and easily available raw materials. , the advantages of simple synthesis method. Like other conductive polymers, polyaniline has relatively high electrical conductivity and dielectric constant, and is one of the most promising materials for shielding electromagnetic radiation and reducing or eliminating electromagnetic wave interference. In addition, polyaniline has anti-corrosion and anti-marine biological pollution properties, and can be used as metal anti-corrosion coatings, especially marine coatings. [0003] Both elemental iron and iron nitride are excellent magnetic materials and electromagnetic wave absorbing m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/02C08G73/02C08K7/06C08K3/04C08K7/24C08K3/28C08K3/08
Inventor 陈雪刚叶瑛夏枚生朱旭恒李海晏张奥博张海燕刘舒婷
Owner ZHEJIANG UNIV
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