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Flaming retarding highly conductive silicon rubber composite material and preparation method thereof

A composite material and silicone rubber technology, which is applied in the field of flame-retardant high-conductivity silicone rubber composite materials and their preparation, can solve problems such as inability to guarantee char formation, achieve good conductivity, improve thermal stability, and improve flame-retardant effects Effect

Active Publication Date: 2012-07-04
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above flame retardant system cannot guarantee its char formation
[0008] Therefore, the problem of how to endow silicone rubber with good electrical conductivity and good flame retardancy has not been effectively resolved.

Method used

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  • Flaming retarding highly conductive silicon rubber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) 100 parts (refer to parts by mass, the same below) vinyl molar content is 0.25%, molar mass 50×10 4 g / mol polymethylvinylsiloxane (110-2 methylvinyl silicone rubber, produced by Zhongwu Chenguang Chemical Research Institute) is wrapped on a double-roll mill, and 18 parts of specific surface area is added to be 300m 2 / g of fumed silica reinforced filler, evenly mixed.

[0037] (2) Then add 20 parts of superfine calcium carbonate (OMYACARB1T-NJ, produced by Nanjing Omiya Fine Chemical Co., Ltd.) with an average particle size of 1 μm, 13 parts of glass powder with a softening point of 450 ° C and a particle size of 18 μm, 3 parts Cerium oxide powder and 230 parts of nickel-plated graphite (product of NOVAMET company) with a particle size of 20-30 μm and a nickel content of 60% and an average particle size of 20 μm were kneaded uniformly.

[0038] (3) Then add 4 parts of hydrogen-containing silicone oil with a viscosity of 500mP·s at 25°C and at least 5 Si-H bonds per...

Embodiment 2

[0044] The amount of nickel-plated graphite is 150 parts, and 120 parts of silver-coated glass powder with an average particle size of 12 μm are added, and 0.6 parts of platinum double-headed (unsaturated siloxane solution of platinum, that is: platinum and unsaturated siloxane complex) solution (corresponding to 55ppm), and other conditions are the same as in Example 1 to obtain a silicone rubber composite. Its volume resistivity reaches 0.01Ω·cm, the limiting oxygen index reaches 41.1%, and reaches the V-0 level of UL94. When the material is burned, the amount of smoke is small, and the burning residue forms a continuous and hard ceramic layer on the surface.

Embodiment 3

[0046] The amount of hydrogen-containing silicone oil was 0.8 parts, and other conditions were the same as in Example 1 to obtain a silicone rubber composite material. Its volume resistivity reaches 0.07Ω·cm, the limiting oxygen index reaches 39.9%, and the flame retardant grade is V-0 of UL94. When the material is burned, the amount of smoke is less, and the burning residue forms a continuous ceramic layer on the surface.

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Abstract

The invention relates to an inflaming retarding highly conductive silicon rubber composite material and a preparation method thereof. The silicon rubber composite material with good electroconductibility and inflaming retarding property is obtained through the following steps: using nickel-clad graphite endowed with the certain function of promoting carbonization, modifying silicon rubber by adding superfine calcium carbonate powder, low softening point glass dust and hydrogen-containing silicone oil, and carrying out vulcanization by using a hydrosilylation vulcanization system.

Description

Technical field: [0001] The invention relates to a flame-retardant high-conductivity silicone rubber composite material and a preparation method thereof, which are applied in the fields of conductive connectors and electromagnetic shielding with high flame-retardant requirements. Background technique: [0002] Silicone rubber is a kind of cross-linkable and curable polymer elastomer with Si-O bond as the main chain and organic groups (such as methyl, vinyl, phenyl, etc.) connected to Si atoms as side chains. Due to its excellent high and low temperature resistance and anti-aging performance, it can be used for a long time in a wide temperature range (-50 ° C ~ 200 ° C), and it is an excellent material in the fields of flame retardancy, high and low temperature resistance, aging resistance, and electrical conductivity. elastomer matrix material. [0003] Silicone rubber is insulating, but by adding conductive fillers such as graphite, conductive carbon black, silver powder, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K3/36C08K3/26C08K9/02C08K3/40C08K3/22C08K5/098C08K3/08C08K3/04
Inventor 田明韦震宇张立群邹华冯予星张继阳
Owner BEIJING UNIV OF CHEM TECH
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