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Preparation method for electromagnetic shielding silicone rubber

An electromagnetic shielding and silicone rubber technology is applied in the field of preparation of electromagnetic shielding silicone rubber, which can solve the problems of affecting the electrical conductivity and magnetic permeability of silicone rubber, being expensive, and having no catalytic activity.

Active Publication Date: 2014-03-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The common nickel plating process generally uses hypophosphite as the reducing agent, but hypophosphite has no catalytic activity, and copper powder (including other plating materials) must be sensitized and activated in advance. The commonly used activator is palladium ion, Expensive and prone to bath decomposition
In addition, when hypophosphite is used as the reducing agent, the coating contains a large amount of nickel-phosphorus alloy, which will eventually affect the electrical conductivity and magnetic permeability of silicone rubber.

Method used

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preparation example Construction

[0026] The embodiment of the present invention discloses a preparation method of electromagnetic shielding silicone rubber, comprising the following steps:

[0027] Mixing disodium edetate solution with sodium potassium tartrate solution to obtain a first mixed solution;

[0028] Mixing a solution containing divalent nickel ions with the first mixed solution to obtain a second mixed solution;

[0029] Mixing the second mixed solution with the hydrazine solution to obtain a third mixed solution;

[0030] Copper powder is mixed with the third mixed solution to obtain nickel-plated copper powder after reaction;

[0031] The raw silicone rubber, the vulcanizing agent and the nickel-plated copper powder are sequentially banburyed and vulcanized to obtain the electromagnetic shielding silicone rubber.

[0032] In order to prepare electromagnetic shielding silicone rubber materials, the application uses nickel-plated copper powder as the filler of silicone rubber, so the applicatio...

Embodiment 1

[0052] Dissolve 24g EDTA-2Na in 300ml of water, dissolve 18g potassium sodium tartrate in 100ml of water; weigh 27gNiSO 4 ·6H 2 Dissolve O in 100ml of water; measure 80ml of N 2 h 2 ·H 2 O was diluted with 100ml of water. Mix the first two solutions and adjust the pH to 7.5 with ammonia water, then slowly add the hydrazine solution, stir rapidly when adding, adjust the pH to about 12.5 with 1.0mol / L sodium hydroxide, add water until the solution is close to 1L, and use 0.1mol / L sodium hydroxide solution to adjust the pH to 13, then add water to 1L to obtain a plating solution. Heat the plating solution in a water bath to 85°C. When the temperature rises to 75°C, add 25g of copper powder under rapid stirring, and continue stirring until the red color disappears. When the temperature rises to 85°C, keep it warm for 1 hour. Filter the copper powder and wash it with water until neutral. Rinse twice with acetone and dry at low temperature to obtain nickel-plated copper powder...

Embodiment 2

[0055] Dissolve 35g EDTA-2Na in 350ml water, dissolve 15g sodium potassium tartrate in 100ml water; weigh 40gNiSO 4 ·6H 2 Dissolve O in 150ml water, measure N 2 h 2 ·H 2 Dilute O100ml with 100ml of water. Mix the first two solutions and adjust the pH to 7.5 with ammonia water, then slowly add the hydrazine solution, stir rapidly when adding, adjust the pH to about 13 with 1.0mol / L sodium hydroxide, add water until the solution is close to 1L, and use 0.1mol / L sodium hydroxide solution to adjust the pH to 13.5, then add water to 1L to obtain a plating solution. Heat the plating solution in a water bath to 80°C. When the temperature rises to 70°C, add 25g of copper powder under rapid stirring, and continue stirring until the red color disappears. When the temperature rises to 80°C, keep it warm for 1 hour. Filter the copper powder and wash it with water until neutral. Rinse twice with acetone and dry at low temperature to obtain nickel-plated copper powder.

[0056] Set t...

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Abstract

The invention provides a preparation method for electromagnetic shielding silicone rubber. The preparation method comprises the following steps: an ethylenediamine tetraacetic acid disodium solution is mixed with a sodium potassium tartrate solution so as to obtain a first mixed solution; a solution containing divalent nickel ions is mixed with the first mixed solution so as to obtain a second mixed solution; the second mixed solution is mixed with a hydrazine solution as to obtain a third mixed solution; copper powder is mixed with the third mixed solution so as to obtain nickel-plated copper powder; banburying and vulcanization are sequentially performed on crude silicone rubber, a vulcanizing agent and the nickel-plated copper powder, so that the electromagnetic shielding silicone rubber is obtained. According to the electromagnetic shielding silicone rubber prepared through the preparation method, the silicone rubber is filled with the nickel-plated copper powder, since the nickel-plated copper powder has good electrical conductivity and migration resistance and nickel has good magnetic conductivity, the prepared electromagnetic shielding silicone rubber has the electrical conductivity and magnetic conductivity at the same time. Therefore, the electromagnetic shielding effect is good.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding materials, in particular to a preparation method of electromagnetic shielding silicone rubber. Background technique [0002] Today's world has entered the era of vigorous and in-depth development of communication electronics. The application of high-frequency and ultra-high-frequency electromagnetic signals has been rapidly expanding and developing, and the fields and scope of applications have been infinitely extended. While high-frequency signals are flourishing, they have also brought some negative effects. Electromagnetic pollution and information leakage caused by electromagnetic radiation have become increasingly serious problems. Especially in the military field, electromagnetic shielding technology is particularly important. [0003] High-performance electromagnetic shielding materials are a combination of reflective shielding and absorbing shielding. Improving the conduc...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K9/10C08K3/08
Inventor 崔洪伟周云峰于力温诗渺庄婷婷白福臣
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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