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Anti-poisoning addition type conductive silicone rubber composition and preparation method thereof

A rubber composition and conductive silicon technology, applied in the field of materials, can solve problems such as difficult processing and molding, poisoning of platinum catalysts, limited application scope, etc., and achieve the effects of improving fluidity, improving the degree of poisoning, and reducing the probability of contact

Active Publication Date: 2022-07-19
SHANGHAI ALLIED PLASTIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shielding conductive materials are preferably precious metals such as gold and silver, but their disadvantages are high quality, high price, and difficulty in processing. Its conductivity, electromagnetic shielding performance, sealing and aging resistance have been widely used in conductive silicone rubber, but due to the introduction of ionic compounds containing silver, tin and other precious metals in the electroless plating process, it is easy to cause platinum catalyst poisoning, Limits the scope of application in addition-type conductive silicone rubber

Method used

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  • Anti-poisoning addition type conductive silicone rubber composition and preparation method thereof

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preparation example Construction

[0027]The preparation method of the anti-poisoning addition type conductive silicone rubber composition is characterized in that: comprising the following steps: (1) preparation of base rubber-A component: organopolysiloxane, catalyst and inhibitor are mixed in an open rubber mixing machine, Mix evenly in a closed kneader or planetary mixer to obtain component A; (2) Preparation of base rubber-component B: combine organopolysiloxane, cross-linking agent, and flow aid in an open rubber mixer, closed kneading (3) Conductive powder pre-modification treatment: the conductive filler needs to be subjected to wet surface modification treatment with a silane coupling agent; (4) Preparation of conductive silicone rubber composition: The A component prepared in step (1), the B component prepared in step (2) and the modified conductive powder prepared in step (3) are uniformly mixed in an open rubber mixer, a closed kneader or a planetary mixer to obtain Conductive silicone rubber compos...

specific Embodiment 2

[0034] Raw material components:

[0035] 2 parts of methyl vinyl silicone rubber with a molecular weight of 600,000 and a molar content of vinyl units of 0.30%, 98 parts of methyl vinyl silicone resin with a viscosity of 6800 mPa s and a molar content of vinyl units of 1.50%, 5 Parts platinum catalyst (including 2wt% platinum complex and 98wt% methyl vinyl silicone rubber), 2.5 parts hydrogen-containing polysiloxane with active hydrogen mass fraction of 0.8% (including 6wt% terminal active hydrogen mass fraction of 0.12 % of terminal hydrogen-containing polysiloxane and 94 wt% of side hydrogen-containing polysiloxane), 0.02 parts of 1-ethynylcyclohexanol, 350 parts of particle size D50 about 55 μm, silver content of 15 wt%, with γ-glycidol Ether-propyl trimethoxysilane pre-modified aluminum silver-plated powder, 12 parts of heptane.

[0036] Preparation:

[0037] Step 1: Base glue-A component preparation: Mix methyl vinyl silicone rubber, methyl vinyl silicone resin, platinu...

specific Embodiment 3

[0038] Raw material components:

[0039] 90 parts of methyl vinyl silicone rubber with a molecular weight of 600,000 and a molar content of vinyl units of 0.30%, 10 parts of methyl vinyl silicone resin with a viscosity of 6800 mPa s and a molar content of vinyl units of 1.50%, 2 Parts platinum catalyst (including 3wt% platinum complex and 97wt% methyl vinyl silicone rubber), 2 parts hydrogen-containing polysiloxane with active hydrogen mass fraction of 0.8% (including 6wt% terminal active hydrogen mass fraction of 0.12 % of terminal hydrogen-containing polysiloxane and 94 wt% of side hydrogen-containing polysiloxane), 0.01 part of 1-ethynylcyclohexanol, 250 parts of particle size D50 about 100 μm, nickel content of 55 wt%, with γ-methyl Acryloyloxypropyltrimethoxysilane pre-modified graphite nickel plating powder.

[0040] Preparation:

[0041] Step 1: Base gum-A component preparation: Methyl vinyl silicone rubber, methyl vinyl silicone resin, platinum catalyst, 1-ethynyl cy...

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Abstract

The anti-poisoning addition type conductive silicone rubber composition and its preparation method relate to the field of materials. The anti-poisoning addition type conductive silicone rubber composition is characterized in that it comprises the following components by weight: 100 parts of organopolysiloxane, 2-8 parts of catalyst, 2-5 parts of crosslinking agent, 0.005-0.1 part of inhibitor parts, 300-500 parts of conductive fillers, and 5-25 parts of flow aids. A preparation method of a poisoning addition type conductive silicone rubber composition is used for preparing an anti-poisoning addition type conductive silicone rubber composition. The invention adopts the platinum catalyst with organopolysiloxane as the base material, which can effectively reduce the problem of early vulcanization caused by the high local concentration of the platinum catalyst during the mixing process, and at the same time, the dispersion is more uniform during the mixing, so that the cross-linked network of the conductive rubber is formed. And the conductive network is uniform and dense, and the mechanical properties and electrical conductivity are improved.

Description

technical field [0001] The present invention relates to the field of materials, in particular to rubber materials. Background technique [0002] Addition silicone rubber is made of vinyl-containing polysiloxane as the base polymer, and polyorganosiloxane containing Si-H bond as the cross-linking agent. Under the catalysis of platinum complexes, it passes through under certain temperature conditions. A class of organosilicon materials that are cross-linked and vulcanized by hydrosilylation. In the process of cross-linking and vulcanization, addition silicone rubber has the advantages of no by-products, small shrinkage, deep curing, and no corrosion to the substrate. However, when the addition type silicone rubber is in contact with organic compounds containing nitrogen, phosphorus, sulfur and other elements or ionic compounds of heavy metals such as silver, tin, lead, mercury, bismuth and arsenic, the platinum catalyst contained in it is easily poisoned and the silicone rubb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08L91/00C08K9/06C08K9/02C08K7/20C08K5/05C08K3/08C08K5/01C08K3/04
Inventor 高文廷
Owner SHANGHAI ALLIED PLASTIC IND