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Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material

A technology of electromagnetic shielding materials and conductive rubber, which is applied in the field of materials, can solve the problems of unqualified conductive rubber products, and achieve the effect of excellent extrusion performance and excellent shear resistance

Active Publication Date: 2015-11-18
重庆新福佰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even the final conductive rubber product will not meet the MIL-83528 standard and produce substandard products

Method used

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  • Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material
  • Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material
  • Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] In this embodiment, spherical artificial graphite coarse powder of 40-160 um is selected, and the preparation method of nickel-coated graphite powder with silver plating of 3 wt % and nickel plating of 60 wt % is as follows.

[0066] (1) Take 50g of graphite powder, soak it in 100ml NaOH solution of 42% concentration for 15min at room temperature, and wash it with deionized water until neutral.

[0067] (2) Immerse the above powder into 100ml of strong acid etching solution mixture prepared according to the mass percentage, the proportioning method is: concentrated sulfuric acid: concentrated phosphoric acid: water = 2:1:7. The soaking temperature is room temperature, and the soaking time is 45 minutes. After the etching is completed, the graphite powder is cleaned to be neutral for use.

[0068] (3) Soak the above powder in 50ml of SnCl with a concentration of 11g / L 2 Mixed with 50ml of HCl with a concentration of 40ml / L, stirred slowly at room temperature at a speed...

Embodiment 2

[0078] The present embodiment selects the pillow-shaped artificial graphite coarse powder of 40-160um for use, and the preparation method of the nickel-coated graphite powder of silver-plated 4wt% and nickel-plated 65wt% is:

[0079] Carry out according to the step of embodiment 1 (1), (2), (3), and the silver nitrate concentration in (4) is changed into 32.8g / L, all the other remain unchanged. Change the nickel sulfate of (5) into 431.8g among the embodiment 1, change the citric acid and sodium citrate in the B solution into 28g and 32g, change the thiourea into 2.6mg, all the other remain unchanged. The prepared nickel-coated graphite powder is 148.5g, the thickness of the coating is 6.51um, and the performance indicators of the nickel-coated graphite powder are shown in Table 1 above.

Embodiment 3

[0081] Present embodiment selects the artificial graphite fine powder of 10-30um for use, the preparation method of the nickel-coated graphite powder of silver plating 8wt% and nickel plating 70wt% is:

[0082] Choose 30g artificial graphite fine powder, and carry out according to the step of embodiment 1 (1), (2), (3). Change the silver nitrate concentration in (4) to 41.1g / L, and all the other remain unchanged. The nickel sulfate of (5) among the embodiment 1 is changed into 339.67g, all the other remain unchanged. The prepared nickel-coated graphite powder is 108.6g, and the thickness of the coating is 5.83um, and its appearance is as follows: image 3 As shown, the performance index of nickel-coated graphite powder is shown in Table 1 above.

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Abstract

The invention discloses a preparation method of nickel-coated graphite powder for electroconductive rubber of an electromagnetic shielding material. The preparation method is characterized in that the nickel-coated graphite powder is obtained by carrying out silver plating and hydrogen gas reduction nickel plating after graphite powder is subjected to surface degreasing, coarsening and sensitizing and then carrying out washing, suction filtration and drying. According to the preparation method disclosed by the invention, an excellent interface bonding force is obtained as a coarsening and pre-silver plating layer which is arranged between a nickel plating layer and a graphite powder interface is used as a nickel plating active point, nickel plating is carried out by adopting a hydrogen reduction method, the surface of a pure nickel layer is reduced, and the electromagnetic conductivity is better than that of other reduction nickel plating methods, so that the nickel-coated graphite powder has excellent anti-shearing performance, excellent anti-extrusion performance and excellent electromagnetic conductivity when the nickel-coated graphite powder is mixed with rubber.

Description

technical field [0001] This patent application relates to an electromagnetic shielding material, in particular to a preparation method of a conductive functional powder material for an electromagnetic shielding material, which belongs to the field of material technology. technical background [0002] The miniaturization, integration, light weight, digitalization and high frequency of electronic circuits and components have brought a lot of convenience to our life, but also brought a lot of electromagnetic pollution. In addition, it is also easy to cause the electronic product to be used to be disturbed by external electromagnetic waves, resulting in misoperation, image disturbance and sound disturbance, etc. Shielding with electromagnetic shielding materials is one of the main preventive measures. [0003] Conductive rubber is a very important electromagnetic shielding material. In terms of shielding electromagnetic wave interference, conductive rubber and conductive adhesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/34B22F1/02
Inventor 陈占春
Owner 重庆新福佰科技有限公司
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