Single-component extrusion molding conductive rubber for electromagnetic shielding and preparation method of single-component extrusion molding conductive rubber

An extrusion molding and electromagnetic shielding technology is applied in the field of single-component conductive rubber materials for electromagnetic shielding and its preparation, which can solve the problems of increasing filling amount, single conductive powder form, and declining comprehensive performance.

Inactive Publication Date: 2012-10-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the vulcanization molding temperature of this patent is too high, which will easily lead to oxidation failure of the silver-coated copper powder, reduce the overall performance of the glue, and deteriorate the environmental resistance performance.
[0006] To sum up, the problems existing in the current conductive rubber patents include: (1) solid conductive rubber cannot meet the requirements of on-site molding; (2) the filling amount of conductive powder is high, resulting in high production costs, and at the same time too much filling The particles will also significantly reduce the fluidity of the glue, thereby affecting the on-site dispensing process; (3) the added conductive powder has a single form, and in order to achieve the same conductivity, the filling amount becomes larger; (4) the patent uses AB double groups There are many separations, and the on-site rubber mixing is easy to cause uneven mixing and affect the overall performance
(5) If the vulcanization molding temperature is too high, it will easily lead to oxidation failure of silver-clad copper powder, decline in overall performance, and deterioration of environmental resistance

Method used

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  • Single-component extrusion molding conductive rubber for electromagnetic shielding and preparation method of single-component extrusion molding conductive rubber
  • Single-component extrusion molding conductive rubber for electromagnetic shielding and preparation method of single-component extrusion molding conductive rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0019]The dendritic silver-coated copper powder and silver-plated glass fiber with a silver content of 18wt% were stirred in alcohol for 2 hours to clean the powder impurities according to a certain ratio (1200g dendritic silver-coated copper powder and 200g silver-plated glass fiber), It was then dried in vacuo at 60°C for two hours. On this basis, the amine-based coupling agent methyldisilazineamine was used to stir for 2 hours, and after mixing evenly, put it in a vacuum drying oven and heat it to 120°C to remove the excess coupling agent on the surface. Add 500g of 10000mPa.s vinyl-containing polydimethylsiloxane to the vacuum meshing machine, add 175g of fumed white carbon black under vacuum at 65°C and stir for 2 hours, after mixing evenly, pass through the double planetary stirring equipment in turn Add 0.375g of acetylenic alcohol inhibitor ethynylcyclohexylalkynol, 3g of platinum catalyst and part of the treated conductive powder and mix evenly to make component 1. At...

Embodiment 2

[0023] The dendritic silver-coated copper powder and silver-plated glass fiber with a silver content of 18wt% were stirred in alcohol for 4 hours to clean the powder impurities according to a certain ratio (1531g dendritic silver-coated copper powder and 69g silver-plated glass fiber), It was then dried in vacuo at 80°C for two hours. On this basis, the amine-based coupling agent methyldisilazineamine was used to stir for 3 hours, after mixing evenly, it was placed in a vacuum drying oven and heated to 150°C to remove excess coupling agent on the surface. Add 500g of vinyl-containing polydimethylsiloxane of 20000mPa.s into the vacuum meshing machine, add 114g of fumed white carbon black under vacuum at 65°C and stir for 2 hours, after mixing evenly, pass through the double planetary stirring equipment in turn Add 0.45 g of acetylenic alcohol inhibitor ethynyl cyclohexanol acetylenic alcohol, 3.40 g of platinum catalyst and the treated conductive powder and mix evenly to make c...

Embodiment 3

[0025] The dendritic silver-coated copper powder and silver-plated glass fiber with a silver content of 20wt% were stirred in alcohol for 2 hours to clean the powder impurities according to a certain ratio (1526g dendritic silver-coated copper powder and 508g silver-plated glass fiber), It was then dried in vacuo at 60°C for two hours. On this basis, the amine-based coupling agent methyldisilazineamine was used to stir for 3 hours, and after mixing evenly, it was placed in a vacuum drying oven and heated to 120°C to remove excess coupling agent on the surface. Add 500g of vinyl-containing polydimethylsiloxane of 5000mPa.s into the vacuum meshing machine, add 210g of fumed silica under vacuum at 65°C and stir for 2 hours. Add 0.52g of acetylenic alcohol inhibitor ethynylcyclohexylalkynol, 3.15g of platinum catalyst and the treated conductive powder and mix evenly to make component 1. At the same time, add the treated Mix the conductive powder evenly to make component 2. Then ...

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Abstract

The invention discloses a single-component extrusion molding conductive rubber for electromagnetic shielding and a preparation method of the single-component extrusion molding conductive rubber, belonging to the technical field of electromagnetic shielding materials. The single-component extrusion molding conductive rubber is composed of dendritic silver coated copper powder, silvered glass fiber, polydimethylsiloxane containing vinyl by rubber base body, reinforcing agent gaseous phase white carbon black, alkynol inhibitor, metal platinum catalyst, and cross-linking agent methylhydropolyorganosiloxane. The preparation method comprises the following steps: pretreatment is carried out to the dendritic silver coated copper powder and the silvered glass fiber through amido coupling agent methyl organodisilane according to the formula, the rubber base body and the gaseous phase white carbon black are added in a vacuum kneading machine, are mixed uniformly and are added in a double-planet mixing plant, and then the alkynol inhibitor, the metal platinum catalyst and the treated electric conduction powder are mixed uniformly to form a component 1; the treated electric conduction powder is added in a cross-linking agent and is mixed uniformly to form a component 2; and two components in the double planets are mixed to form the single-component on-site forming electromagnetic shieldingsilicon rubber. The rubber has good shielding performance and good mechanical property.

Description

technical field [0001] The invention relates to a single-component conductive rubber material for electromagnetic shielding used for packaging electronic circuit system shells and a preparation method thereof, belonging to the technical field of electromagnetic shielding materials. Background technique [0002] With the rapid development of modern science and technology, electronic and electrical equipment continue to develop in the direction of functionalization, integration, high frequency, and digitization, and the resulting electromagnetic interference hazards are becoming more and more serious. On the one hand, the electromagnetic interference generated by electromagnetic radiation has a serious impact on the routing design inside the electronic system; The environment poses a threat. Therefore, issues such as compatibility of electronic equipment, information security, electromagnetic environmental pollution and biological effects cannot be ignored. [0003] For the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/06C08K9/10C08K9/02C08K3/08C08K7/14C08K3/04
Inventor 夏志东刘小黑郭福赵萌珂苑博周虎李莹史耀武雷永平
Owner BEIJING UNIV OF TECH
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