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A kind of preparation method of nickel-coated graphite composite powder material for conductive silica gel

A technology of nickel-coated graphite and composite powder, which is applied in the field of preparation of nickel-coated graphite composite powder materials for conductive silica gel, which can solve the problems of non-dense coating of the nickel shell and complicated preparation process, and achieve broadening of the electromagnetic shielding frequency band range, broad application prospects, and high conductivity

Active Publication Date: 2022-05-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a nickel-coated graphite composite powder material for conductive silica gel, in view of the problems that the nickel-coated graphite composite particles prepared by the existing method are not densely coated with nickel shells and the preparation process is complicated, comprising the steps of: as follows:

Method used

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  • A kind of preparation method of nickel-coated graphite composite powder material for conductive silica gel
  • A kind of preparation method of nickel-coated graphite composite powder material for conductive silica gel
  • A kind of preparation method of nickel-coated graphite composite powder material for conductive silica gel

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Embodiment 1

[0023] The specific preparation steps of the preparation method of the nickel-coated graphite composite powder material for conductive silica gel are as follows:

[0024] The particle size of graphite powder is 180μm;

[0025] Step 1: Put 1g of graphite powder in 500ml of sodium hydroxide solution with a mass concentration of 10g / L, wash at 50°C for 20 minutes, suction filter, wash, and dry for later use. During degreasing treatment, keep stirring the graphite powder , and the stirring speed is 30r / min;

[0026] Step 2: Put 1g of degreased graphite powder in 100ml of methanol solution of nickel acetate with a mass concentration of 80g / L, then pour 50ml of sodium borohydride solution with a mass concentration of 18g / L into the activation solution for activation, and activate for 28min , filtered, washed, and vacuum-dried for later use;

[0027] Step 3: Prepare the electroless plating solution, take 14g of nickel sulfate, 7.5ml of hydrazine hydrate, and 77g of potassium sodium...

Embodiment 2

[0030] The specific preparation steps of the preparation method of the nickel-coated graphite composite powder material for conductive silica gel are as follows:

[0031] The particle size of graphite powder is 190μm;

[0032] Step 1: Put 1g of graphite powder in 500ml of sodium hydroxide solution with a mass concentration of 15g / L, wash at 60°C for 40min, filter with suction, wash, and dry for later use. During degreasing treatment, keep stirring the graphite powder , and the stirring speed is 30r / min;

[0033] Step 2: Put 1g of graphite powder after degreasing into 100ml of nickel acetate methanol solution with a mass concentration of 85g / L, then pour 50ml of sodium borohydride solution with a mass concentration of 18g / L into the activation solution for activation, and activate for 29min , filtered, washed, and vacuum-dried for later use;

[0034] Step 3: prepare electroless plating bath, get the nickel sulfate of 14.5g, the hydrazine hydrate of 8ml, the potassium sodium t...

Embodiment 3

[0037] The specific preparation steps of the preparation method of the nickel-coated graphite composite powder material for conductive silica gel are as follows:

[0038] The particle size of graphite powder is 200μm;

[0039] Step 1: Put 1g of graphite powder in 500ml of sodium hydroxide solution with a mass concentration of 20g / L, wash at 70°C for 60min, filter with suction, wash, and dry for later use. During degreasing treatment, keep stirring the graphite powder , and the stirring speed is 30r / min;

[0040] Step 2: Put 1g of graphite powder after degreasing into 100ml of methanol solution of nickel acetate with a mass concentration of 90g / L, then pour 50ml of sodium borohydride solution with a mass concentration of 18g / L into the activation solution for activation, and activate for 30min , filtered, washed, and vacuum-dried for later use;

[0041] Step 3: Prepare the electroless plating bath, get the nickel sulfate of 15g, the hydrazine hydrate of 9ml, the potassium sod...

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Abstract

The invention discloses a preparation method of a nickel-coated graphite composite powder material for conductive silica gel. The preparation process is as follows: 1) degreasing the surface of the graphite powder, cleaning, suction filtering, and drying; 2) activating the cleaned graphite powder, cleaning, suction filtering, and drying; 3) treating the graphite powder after step 2). The graphite powder is put into the electroless plating solution, subjected to electroless plating, suction filtered, washed, and dried to obtain a nickel-coated graphite composite powder material for conductive silica gel. The preparation process of the scheme is simple and convenient, and the prepared nickel-coated graphite composite powder has good coating effect and high production efficiency, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of nickel-coated graphite composite powder materials, in particular to a preparation method of nickel-coated graphite composite powder materials for conductive silica gel. Background technique [0002] The commonly used conductive fillers for conductive silica gel include pure silver powder, silver-coated copper powder, silver-coated aluminum powder, silver-coated glass powder, nickel-coated copper powder, nickel-coated graphite powder, etc. Pure silver powder is used as a conductive compound with good conductivity and good oxidation resistance, but its application range is limited due to the migration of silver particles and its high price. In order to overcome the defects of pure silver powder, conductive composite powders such as silver-coated copper powder, silver-coated aluminum powder, and silver-coated glass powder have been developed successively. However, the price of the silver-based conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/18C23C18/18C23C18/34
CPCC23C18/34C23C18/1893B22F1/17
Inventor 张雪峰赵思洋李逸兴阮佳昌
Owner NORTHEASTERN UNIV LIAONING