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Preparation method of filing type electromagnetic shielding silicon rubber

An electromagnetic shielding and silicone rubber technology, applied in the field of preparation of filled electromagnetic shielding silicone rubber, can solve the problems of high price, decomposition of plating solution, difficult disposal of waste liquid, etc., achieve effective absorption and reflection, reduce the cost of nickel plating, improve Effects of elastic modulus and tensile strength

Active Publication Date: 2015-03-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the electroless nickel plating process is relatively complete. Therefore, most of the magnetic materials for filled electromagnetic shielding silicone rubber use nickel, but when nickel-plating the surface of inert materials, palladium ions are often used to activate the surface of the material. This process is not only expensive, but also causes plating. The liquid is decomposed, and the waste liquid after plating is also difficult to handle

Method used

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Examples

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preparation example Construction

[0024] The invention provides a preparation method of filled electromagnetic shielding silicone rubber, comprising the following steps:

[0025] A) placing the carbon fibers activated by high-concentration hydrochloric acid and acidified by low-concentration hydrochloric acid in a nickel-containing plating solution for nickel plating to obtain nickel-plated carbon fibers;

[0026] The molar concentration of the high-concentration hydrochloric acid is 4.0-6.0 mol / L, and the molar concentration of the low-concentration hydrochloric acid is 0.5-1 mol / L;

[0027] B) adding the nickel-plated carbon fiber, vulcanizing agent, white carbon black and carbon black into silicone rubber for rubber mixing, and preparing samples through vulcanization to obtain filled electromagnetic shielding silicone rubber.

[0028] In the present invention, carbon fiber is used as the conductive filler of the filled electromagnetic shielding silicone rubber, and the carbon fiber is preferably chopped car...

Embodiment 1

[0047] Weigh 30 grams of 4-6mm chopped carbon fibers, soak them in 500ml of concentrated nitric acid at room temperature for 12 hours, filter out the fibers, then soak and filter out the fibers repeatedly in distilled water until the pH of the filtrate is greater than 4. Soak the carbon fiber with hydrochloric acid with a concentration of 6mol / L for 30 minutes, filter out the carbon fiber, soak and filter out the carbon fiber repeatedly with distilled water until the pH of the filtrate is greater than 5. Soak the fibers with hydrochloric acid with a concentration of 0.84mol / L for 30 minutes, and then soak and filter the fibers with distilled water repeatedly until the pH of the filtrate is greater than 6. Dry fibers for later use. Weigh 30g of nickel sulfate hexahydrate and dissolve it in 900ml of water, then add 30g of sodium citrate, 20g of sodium acetate, 0.01g of thiourea, and 40g of sodium hypophosphite in sequence, adjust the pH to 11 with ammonia water, and set the volu...

Embodiment 2

[0051] Weigh 30 grams of chopped carbon fibers of 5-8 mm, soak them in 500 ml of concentrated nitric acid at room temperature for 12 hours, filter out the fibers and repeatedly soak and filter out the fibers in distilled water until the pH of the filtrate is greater than 4. Soak the carbon fiber with hydrochloric acid with a concentration of 6mol / L for 30 minutes, filter out the carbon fiber, soak and filter out the carbon fiber repeatedly with distilled water until the pH of the filtrate is greater than 5. Soak the fibers with hydrochloric acid with a concentration of 0.6 mol / L for 30 minutes, and then soak and filter the fibers with distilled water repeatedly until the pH of the filtrate is greater than 6. Dry fibers for later use. Weigh 35g of nickel sulfate hexahydrate and dissolve it in 900ml of water, add 30g of sodium citrate, 25g of sodium acetate, 0.01g of thiourea, and 45g of sodium hypophosphite in sequence, adjust the pH to 12 with ammonia water, and set the volume...

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Abstract

The invention provides a preparation method of filing type electromagnetic shielding silicon rubber. The preparation method includes the following steps that A, carbon fibers obtained after high-concentration hydrochloric acid activation and low-concentration hydrochloric acid acidification in sequence are placed in a plating solution containing nickel for nickel plating, and nickel-plated carbon fibers are obtained, wherein the molar concentration of high-concentration hydrochloric acid ranges from 4.0 mol / L to 6.0 mol / L, and the molar concentration of low-concentration hydrochloric acid ranges from 0.5 mol / L to 1 mol / L; B, the nickel-plated carbon fibers, a sulfurizing agent, white carbon black and carbon black are added to silicon rubber for rubber refining, and the electromagnetic shielding silicon rubber is obtained after sulfuration sample preparation. The high-concentration hydrochloric acid and the low-concentration hydrochloric acid are selected for activating and acidizing the carbon fibers, the situation that SnCl2 and PdCl2 are used for sensitization and activation is avoided, nickel plating cost is reduced, and environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a preparation method of filled electromagnetic shielding silicone rubber. Background technique [0002] With the rapid development of electronic technology, some high-precision electronic equipment has higher and higher requirements on the external environment. External electromagnetic interference can easily affect the stability of the equipment. At the same time, the electromagnetic radiation of the equipment itself may cause information leakage and threaten the health of operators. Therefore, electromagnetic shielding technology is of great significance in the field of electronic technology. [0003] Electromagnetic shielding actually limits the transfer of electromagnetic energy from one side of the shielding material to the other. The electromagnetic shielding effect (SE) is composed of single reflection loss (R), absorption attenuation (A), a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/08C08L83/04C08K13/06C08K9/02C08K9/04C08K7/06C08K5/14C08K3/30C08K3/34C08K3/04C08J3/24
Inventor 崔洪伟温诗渺庄婷婷李冬威于力聂伟白福臣
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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