Structural conductive silicone rubber for electromagnetic shielding and preparation thereof

A technology of electromagnetic shielding and conductive silicon, applied in the direction of rubber layered products, laminated, layered products, etc., can solve the problems of complex interlayer connection process, inability to perform pressure sealing, and lack of elastic body properties, etc., to achieve The effect of single layer connection process, good shielding performance and good electromagnetic shielding performance

Inactive Publication Date: 2016-07-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although the maximum shielding effectiveness of the composite material can reach 75dB in the range of 2-18GHz, its shielding effectiveness changes in a parabolic shape, and the minimum shielding effectiveness is only about 5dB
Therefore, the composite material cannot meet the requirements of good shielding performance in a wide frequency range.
[0011] Based on the above, the problems existing in the current conductive silicone rubber patents include: (1) the selection of precious metal fillers increases the production cost; (2) in the case of a single material structure, in order to achieve the ideal conductivity, a large Filling amount of fillers, and the preparation of fillers complicates the whole preparation process when a variety of self-made fillers are mixed; (3) The interlayer connection process of structural composite materials made by superimposing multiple single materials is complicated and plays a major role The conductive layer (metal flake or metal coating) has poor toughness and is not suitable for stress environments; (4) The material system of metal-polymer structural composite materials is mostly based on thermosetting materials or paraffin wax, which do not have the properties of elastomers, and even Can not play the role of pressure seal

Method used

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  • Structural conductive silicone rubber for electromagnetic shielding and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Filler: preferred nickel-coated graphite powder (Ni-C), with a nickel content of 40-80wt.%.

[0033] First, 0.3 g of acetylene cyclohexanol inhibitor, 25 g of methylhydrogen polysiloxane crosslinking agent, and 2.0 g of Karlster platinum catalyst were respectively added to 600 g of rubber matrix containing vinyl-terminated polydimethylsiloxane , Stir at 25-35°C for 20 minutes to prepare the base rubber, and vacuumize to ensure that the pressure difference is ≥0.09MPa. Next, add 1078g of nickel-coated graphite powder (63.2wt.%), first stir for 5 minutes under normal pressure, and then stir for another 5 minutes in a vacuum environment. Then, the conductive silicone rubber was vulcanized into a 1 mm thick sample at a vulcanization temperature of 185°C. Finally, two 1mm-thick samples were stacked in a 2mm-thick extrusion mold, and base glue was added between the layers. Put it under the vulcanization pressure of 10MPa for 10s to squeeze out the excess base rubber, then r...

Embodiment 2

[0035] Filler: preferred nickel-coated graphite powder (Ni-C), with a nickel content of 40-80wt.%.

[0036] First, 0.3 g of acetylene cyclohexanol inhibitor, 25 g of methylhydrogen polysiloxane crosslinking agent, and 2.0 g of Karlster platinum catalyst were respectively added to 600 g of rubber matrix containing vinyl-terminated polydimethylsiloxane , Stir at 25-35°C for 20 minutes to prepare the base rubber, and vacuumize to ensure that the pressure difference is ≥0.09MPa. Next, add 940g of nickel-coated graphite powder (60.0wt.%), first stir for 5 minutes under normal pressure, and then stir for another 5 minutes in a vacuum environment. The stirring temperature is room temperature, and vacuuming ensures that the pressure difference is ≥ 0.09MPa. Then, vulcanize the conductive silicone rubber into a sample sheet with a thickness of 0.9-1 mm at a vulcanization temperature of 185°C. Finally, four pieces of 0.9-1mm thick samples were stacked in a 4mm thick extrusion mold, and...

Embodiment 3

[0038] Filler: preferred nickel-coated graphite powder (Ni-C), with a nickel content of 40-80wt.%.

[0039] First, 0.3 g of acetylene cyclohexanol inhibitor, 25 g of methylhydrogen polysiloxane crosslinking agent, and 4.0 g of Karlster platinum catalyst were added to 700 g of rubber matrix containing vinyl-terminated polydimethylsiloxane , Stir at 25-35°C for 20 minutes to prepare the base rubber, and vacuumize to ensure that the pressure difference is ≥0.09MPa. Next, add 1296g of nickel-coated graphite powder (63.9wt.%), first stir for 5 minutes under normal pressure, and then stir for another 5 minutes in a vacuum environment. Then, the conductive silicone rubber was vulcanized into two samples with a thickness of 0.5 mm and a sample with a thickness of 2 mm at a vulcanization temperature of 185°C. Finally, the three samples were stacked in a 3mm thick extrusion mold, and the base glue was added between the layers. Put it under the vulcanization pressure of 10MPa for 10s t...

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Abstract

A structural conductive silicone rubber for electromagnetic shielding and its preparation, belonging to the technical field of conductive polymer composite materials. Conductive silicone rubber composite material with double-layer or multi-layer structure, and a layer of base glue is coated between the layers as an insulating adhesive layer. Conductive silicone rubber composite material: conductive powder, silicone containing vinyl polydimethylsiloxane Rubber matrix, acetylenic alcohol inhibitor, platinum catalyst, crosslinking agent. The structural conductive silicone rubber prepared by the invention can effectively improve the shielding efficiency and performance stability in the 100KHz-18GHz wide frequency range while ensuring the general mechanical performance requirements.

Description

technical field [0001] The invention belongs to conductive polymer composite materials, and relates to a structural conductive silicone rubber with good electromagnetic shielding performance in a wide frequency range and a preparation method thereof, which can be applied to the field of electromagnetic shielding. Background technique [0002] With the rapid development of modern science and technology, electronic and electrical equipment continue to develop towards integration and miniaturization, and the resulting electromagnetic interference hazards are becoming increasingly serious. Conductive silicone rubber, as a composite elastomer that can effectively weaken or suppress electromagnetic interference hazards by generating absorption or reflection loss, has become a new emerging electromagnetic shielding material. [0003] Conductive silicone rubber is a rubber product made by fully mixing one or more filling materials with polymer silicone rubber and other additives, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B25/04B32B25/20B32B37/02C08L83/07C08K9/10C08K3/04C08K3/08B29C35/02
Inventor 夏志东王晓雅聂京凯李哲雷永平郭福
Owner BEIJING UNIV OF TECH
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