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Preparation method of graphene gradient-coated polyacrylic acid composite conducting particles

A technology of polyacrylic acid and conductive particles, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problems of easy-off conductivity, non-wear resistance, poor bonding force of the surface coating layer, etc., and achieve dimensional stability Good, reduce the density, avoid the effect of poor adhesion

Active Publication Date: 2019-01-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of high conductivity and low cost graphene gradient coated polyacrylic acid composite conductive particles, to solve the problem of poor adhesion, non-abrasion resistance and easy falling off of the surface coating layer in the prior art Or cover the conductivity of the sacrificial conductive layer through covalent bonds, etc.

Method used

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  • Preparation method of graphene gradient-coated polyacrylic acid composite conducting particles
  • Preparation method of graphene gradient-coated polyacrylic acid composite conducting particles
  • Preparation method of graphene gradient-coated polyacrylic acid composite conducting particles

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preparation example Construction

[0035] see figure 1 , the preparation method of the graphene gradient coating polyacrylic acid composite conductive particle of one embodiment, comprises the steps:

[0036] S110 disperses the graphene powder prepared by the expansion intercalation method into deionized water, then adds concentrated sulfuric acid and concentrated nitric acid, and reacts in an oil bath at 50°C for 6 to 10 hours, then centrifuges and washes the product to obtain carboxylated Graphene. Its main reaction equation is as follows:

[0037]

[0038]

[0039] Among them, the graphene powder prepared by the expansion intercalation method has an atomic percentage of oxygen less than 1%, and a sheet diameter between 100 nm and 10 μm. The concentration of the graphene powder prepared by the expansion intercalation method is 1.2-5 mg / ml. The mass concentration of concentrated sulfuric acid is 70%, the mass concentration of concentrated nitric acid is 70%, and the volume ratio of concentrated sulfur...

Embodiment 1

[0053] In the present embodiment, the preparation method of the polyacrylic acid composite conductive particles coated with graphene gradient is as follows:

[0054] 1. Weigh 150 mg of expanded intercalated graphene raw material, the atomic percentage of oxygen in the graphene powder is 0.5%, the sheet diameter is 3-5 μm, dissolve in the mixture of concentrated sulfuric acid and concentrated nitric acid, ultrasonic for 1 hour, concentrated The volume ratio of sulfuric acid and concentrated nitric acid is 3:1, and the volume of concentrated sulfuric acid and concentrated nitric acid is 40mL.

[0055] 2. Put the ultrasonic dispersion liquid in a three-necked flask, and reflux reaction under a constant temperature digital display magnetic stirrer, the reaction temperature is 90°C, and the reaction time is 7 hours.

[0056] 3. Pour the reaction liquid into a large amount of deionized water to terminate the reaction. After standing for a period of time, pour off the supernatant liq...

Embodiment 2

[0066] In the present embodiment, the preparation method of the polyacrylic acid composite conductive particles coated with graphene gradient is as follows:

[0067] 1. Weigh 150 mg of expanded intercalated graphene raw material, the atomic percentage of oxygen in the graphene powder is 0.5%, the sheet diameter is 3-5 μm, dissolve in the mixture of concentrated sulfuric acid and concentrated nitric acid, ultrasonic for 1 hour, concentrated The volume ratio of sulfuric acid and concentrated nitric acid is 3:1, and the volume of concentrated sulfuric acid and concentrated nitric acid is 40mL.

[0068] 2. Put the ultrasonic dispersion liquid in a three-necked flask, and reflux reaction under a constant temperature digital display magnetic stirrer, the reaction temperature is 90°C, and the reaction time is 7 hours.

[0069] 3. Pour the reaction liquid into a large amount of deionized water to terminate the reaction. After standing for a period of time, pour off the supernatant liq...

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Abstract

The invention relates to the technical field of the composite conductivity and in particular to a preparation method of graphene gradient-coated polyacrylic acid composite conducting particles. The preparation method comprises the following steps: enabling graphene powder prepared by an expansion intercalation method to be dispersed in mixed liquid of concentrated sulfuric acid and concentrated nitric acid, and performing an oil bath reaction, to obtain carboxylated graphene; enabling the carboxylated graphene to be dispersed in N,N-dimethylformamide, adding 1-ethyl-(3-dimethyl aminopropyl) carbodiimide hydrochloride, after ultrasonic dispersion, adding ethidene diamine into dispersing liquid, performing the oil bath reaction, to obtain amination graphene; enabling dry polyacrylic acid particles to be placed in water dispersing liquid of the amination graphene, under the action of an osmotic pressure and an electrostatic attraction force, coating the surface of the polyacrylic acid particles with graphene, and along a gap between molecular chains, diffusing to a particle core part; and then adjusting a pH value of the water dispersing liquid of the polyacrylic acid particles and the graphene to be 1-2, after drying in vacuum, to obtain the graphene gradient-coated polyacrylic acid composite conducting particles.

Description

technical field [0001] The invention relates to the technical field of composite conduction, in particular to a preparation method of polyacrylic acid composite conduction particles coated with graphene gradient. Background technique [0002] Conductive fillers mainly include metal fillers, carbon fillers, metal oxide fillers, composite fillers, etc., and composite conductive fillers include metal-plated powders and fibers. [0003] Commonly used metal conductive fillers include silver, copper, nickel, iron, etc. Among them: silver has the advantages of good conductivity and strong oxidation resistance, but it is expensive, and it is prone to electromigration in hot and humid environments, resulting in silver conductive adhesive. The resistance is unstable; copper, nickel, iron, etc. have poor oxidation and corrosion resistance, which affects their long-term use. Metal oxide-based fillers have poor electrical conductivity and poor corrosion resistance, and are not suitable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/21C08L33/02C08K9/04C08K9/02C09C3/10C09C1/44C08K3/04
CPCC08J3/215C08J2333/02C08K9/02C08K9/04C08K9/08C08K2201/001C09C1/44C09C3/10C08K3/042
Inventor 曾尤郝亚斌张藤心方明赫英哲王函成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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