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Preparation method of nickel-coated copper powder for conductive rubber

A technology of conductive rubber and nickel-clad copper, which is applied in the direction of liquid chemical plating, coating, metal material coating process, etc., can solve the problems of high cost, increased energy consumption, environmental pollution, etc., and achieve the reduction of plating cost and saving Effects of energy consumption and water conservation

Active Publication Date: 2013-04-24
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) Copper powder process is complex: activation, sensitization, pickling and other pre-treatments not only increase the plating process, but also increase the waste of water resources with multiple washings after treatment; (2) Additional energy input: the plating process The heating not only increases the energy consumption, but also requires high control of the coating process; (3) there is environmental pollution: using hydrazine as the reducing agent and repeated cleaning has a large pollution to the environment; (4) the cost is high: Activated by palladium chloride, the cost is higher

Method used

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  • Preparation method of nickel-coated copper powder for conductive rubber
  • Preparation method of nickel-coated copper powder for conductive rubber
  • Preparation method of nickel-coated copper powder for conductive rubber

Examples

Experimental program
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Effect test

example 1

[0061] The nickel content of the design formula is 30%, the mass of copper powder is 2g, and the particle size of the powder is 75μm. Plating solution formula: nickel sulfate 39g / L, sodium hypophosphite 40g / L, sodium citrate 44g / L, copper powder loading 20g / L. The final plating solution volume is about 100ml, the plating pH=12~13, the preparation process is as follows figure 1 shown.

[0062] Weigh a 1 =a 2 =2.0g sodium hydroxide, dissolved to get A 1 、A 2 ; Measure B 1 = 10ml, B 2 =2ml; mixed solution A 2 with B 2 , to obtain a solution C ≈ 20ml, where a 2 The concentration in C is 100g / L, B 2 The concentration in C is 100ml / L; 1 , copper powder, B 1 Slowly add to the plating solution beaker in turn, stirring the plating solution continuously; the plating reaction time is 10-20 minutes, during the plating process, slowly add C solution dropwise for 20-30 minutes, the average rate is 1-2ml / min, to make the pH of the plating solution The value is maintained at (12-...

example 2

[0068] Design Example 1 comparative test, plating pH=11~12, other operations are the same as Example 1, EDS coating composition analysis is shown in Table 1.

example 3

[0070] Design Example 1 comparative test, plating pH = 13 ~ 14, other operations are the same as Example 1, the composition analysis of EDS coating is shown in Table 1.

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Abstract

The invention provides a preparation method of a nickel-coated copper powder for a conductive rubber, and belongs to the technical field of surface treatment of powder bodies. According to the preparation method, a chemical reduction method is carried out, a plating solution and a pH (Potential Of Hydrogen) regulator are reasonably prepared at a room-temperature condition, therefore the surface of copper powder is subjected to basic deoxidation in order to realize the purpose of optimizing a plating-coating process; the method of continuously dropping the mixed solution of ammonia water and sodium hydroxide is carried out, thereby the stability of the plating solution is maintained, and the pH value of the plating solution is maintained to between 11 to 14; and the prescriptions under different concentrations are prepared, therefore the nickel-coated copper powder containing different nickel contents can be obtained. The nickel-coated copper powder prepared by the preparation method provided by the invention is complete, continuous and dense; the plating solution is clear; the nickel ions are completely transformed; the plating layer has the thickness up to more than 1 micron; the magnetizing strength of the power bodies is more than 10emu / g; the nickel-coated copper powder contains 30wt.% of nickel; and the shielding effectiveness of the conductive rubber at middle-high frequency can be more than 50 by testing through a coaxial method when the mass is filled to 220 parts.

Description

technical field [0001] The invention belongs to the technical field of powder surface treatment and relates to a method for coating nickel on the surface of copper powder. The prepared nickel-coated copper powder has the characteristics of simple process, complete coating and good magnetic properties, and is an ideal electromagnetic shielding conductive rubber filler. Background technique [0002] With the development of electronic technology, various digital and high-frequency electronic appliances bring a lot of convenience to our life, but also bring a lot of electromagnetic pollution. Therefore, the research on electromagnetic shielding materials has very important practical significance. [0003] Electromagnetic shielding rubber is a very important electromagnetic shielding material, which is mainly composed of rubber and conductive filler. Common conductive rubber fillers include silver-coated copper powder, silver-coated aluminum powder, nickel-coated copper powder, ...

Claims

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Application Information

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IPC IPC(8): C23C18/36B22F1/02
Inventor 夏志东陈南南李哲
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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