Nickel-coated graphite composite particle preparation method

A technology of composite particles and nickel-coated graphite, which is applied in the direction of liquid chemical plating, coating, metal material coating technology, etc., can solve the problems of poor electrical conductivity of composite particles, reducing the size of graphite powder, and unsatisfactory coating effect, etc. , to achieve the effect of uniform nickel shell, high utilization rate, and easy popularization and application

Active Publication Date: 2014-04-02
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The technical problem solved by the present invention is that the nickel-coated graphite composite particles prepared by the existing method have the problems of cumbersome pretreatment process, environmental protection and high cost, especially: 1. the size of graphite powder is easily reduced by strong acid oxidation treatment; 2. sensitization In the activation process, noble metal reagents such as toxic stannous chloride and palladium were used, and the nickel particles were difficult to deposit on the surface of the graphite powder, resulting in unsatisfactory coating effect and poor electrical conductivity of the composite particles. A method for preparing nickel-coated graphite composite particle method

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  • Nickel-coated graphite composite particle preparation method

Examples

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Effect test

Embodiment 1

[0033] With 100mL of absolute ethanol and 100mL of deionized water as the solvent, add 10g of flake graphite particles into a 250mL Soxhlet extractor at 85°C, reflux for 8 hours; filter and vacuum dry for later use. Put the cleaned and dried graphite particles into 200g / L nickel sulfate solution for adsorption for 12h, filter and dry for later use; then take 0.5g of the above-mentioned graphite particles and place them in ethanol solution of sodium borohydride (12.5g / L) for 4h, After the graphite particles and ethanol solution are separated, filter, wash and dry for later use. To prepare the electroless nickel plating solution, take 5g of nickel sulfate hexahydrate, 7.5g of sodium citrate, 5g of ammonium chloride, 10mL of ammonia water, and 2mL of 85% hydrazine hydrate solution to prepare a 250mL electroless nickel plating solution; put 250mL of the electroless nickel plating solution into Heat the three-necked flask to 90°C, add 0.5 g of pre-treated graphite particles, and re...

Embodiment 2

[0038]With 133mL of absolute ethanol and 67mL of deionized water as the solvent, add 10g of flake graphite particles into a 250mL three-necked flask and reflux for 8 hours; filter and vacuum dry for later use. Put the cleaned and dried graphite particles into 200g / L nickel sulfate solution for adsorption for 12h, filter and dry for later use; then take 0.5g of the above-mentioned graphite particles and place them in ethanol solution of sodium borohydride (12.5g / L) for 4h, After the graphite particles and the ethanol solution were separated, they were filtered and dried for later use. To prepare the electroless nickel plating solution, take 5g of nickel sulfate hexahydrate, 7.5g of sodium citrate, 5g of ammonium chloride, 10mL of ammonia water, and 2mL of 85% hydrazine hydrate solution to prepare a 250mL electroless nickel plating solution; put 250mL of the electroless plating solution into three ports Heat the flask to 83° C., add 0.5 g of pre-treated graphite particles, and r...

Embodiment 3

[0041] With 167mL of absolute ethanol and 33mL of deionized water as the solvent, add 10g of flake graphite particles into a 250mL Soxhlet extractor at 85°C and reflux for 8 hours; filter and vacuum dry for later use. Put the cleaned and dried graphite particles into 200g / L nickel sulfate solution for adsorption for 12h, filter and dry for later use; then take 0.5g of the above-mentioned graphite particles and place them in ethanol solution of sodium borohydride (12.5g / L) for 4h, After the graphite particles and the ethanol solution were separated, they were filtered and dried for later use. To prepare the electroless nickel plating solution, take 5g of nickel sulfate hexahydrate, 7.5g of sodium citrate, 5g of ammonium chloride, 10mL of ammonia water, and 2mL of 85% hydrazine hydrate solution to prepare a 250mL electroless nickel plating solution; put 250mL of the electroless plating solution into three ports Heat the flask to 81° C., add 0.5 g of pre-treated graphite particle...

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Abstract

The invention relates to a nickel-coated graphite composite particle preparation method including the steps of 1) cleaning, filtering and drying surfaces of flake graphite particles, 2) placing the cleaned flake graphite particles into nickel sulfate solution to adsorb nickel ion and then filtering and drying, 3) reducing the nickel ion on the surfaces of the flake graphite particles and then filtering, washing and drying, and 4) placing the flake graphite particles subjected to treatment of the step 3) into chemical nickel plating solution, stirring to react at the temperature of 80-90 DEG C, and then filtering, washing and drying to obtain the nickel-coated graphite composite particles. The nickel-coated graphite composite particle preparation method is easy and low in cost, and the composite particles prepared by the method have excellent electric conductivity and magnetic conductivity.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding composite materials, in particular to a method for preparing nickel-coated graphite composite particles. Background technique [0002] The nickel-coated graphite composite particles have both the excellent properties of graphite and nickel, and can have excellent electrical conductivity and magnetic properties at the same time. Compared with other conductive fillers or magnetic conductive fillers, its composite material can have good shielding performance in a wider frequency range. [0003] At present, most of the literature reports on nickel-coated graphite composite particles have problems such as cumbersome process or non-dense coating of nickel shell. For example: Qu Zhanmin (Electroplating and Environmental Protection. 2007; 27(4): 29-31) proposed to use concentrated sulfuric acid and K 2 Cr 2 o 7 Graphite particles with a particle size of 5-20 μm are subjected to pretreatments s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/18C23C18/32
Inventor 官建国兰芳王一龙赵素玲刘丽君
Owner WUHAN UNIV OF TECH
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