Carbon-series modified high-conductivity foaming ethylene propylene diene monomer

Abstract

The invention discloses a carbon-series modified high-conductivity foaming ethylene propylene diene monomer, which is prepared from the following raw materials in parts by weight: 100 parts of raw ethylene propylene diene monomer, 5-10 parts of zinc oxide, 1-3 parts of stearic acid, 30-60 parts of carbon black, 20-40 parts of light calcium carbonate, 15-35 parts of paraffin oil, 3-6 parts of an accelerant, 0.5-1.0 part of sulfur, 5 parts of a foaming agent and 5-15 parts of a carbon-series composite component. The material prepared by the invention can realize good combination of foaming, low density and conductivity, and is suitable for rubber sealing elements.

Description

technical field [0001] The invention belongs to the technical field of rubber, and in particular relates to a carbon-based modified highly conductive foamed EPDM rubber. Background technique [0002] Traditional foam sealing materials, due to the cell structure inside the material, the collective parts of the material after molding are connected by loose cell walls. The original characteristic of EPDM rubber material is high electrical insulation. In the foam structure , and its conductivity becomes worse. When the specific gravity of foamed EPDM rubber is controlled at 500kg / m 3 When within, its volume resistivity is generally higher than 10 13 Ω·cm, if there is a requirement for conductivity, the volume resistivity can generally be achieved at 10 10 -10 12 Ω·cm, volume resistivity of 10 can be achieved when the conductivity requirement is high 8 -10 10 Ω·cm. In some fields of use such as rail vehicles, the material should not only play a sealing role, but also have ...

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Problems solved by technology

[0003] However, the volume resistivity needs to be achieved in materials with slightly better conductivity such as nitrile rubber, neoprene, fluororubber, and silicone rubber, which has been studied more in the industry. Due to the difference in performance, it is impossible to realize the EPDM material Substitute, so it is necessary to solve the conductive problem of EPDM material

[0004] At present, the way to solve this problem is to improve the conductivity of rubber materials through traditional means, mainly by adding carbon black or conductive metals. However, the ability of the former to improve the conductivity is relatively weak, and excessive addition will cause the hardness of the material to be biased. High and difficult to foam; although the latter can effectively improve the conductivity of rubber materials, metal particles with good conductivity, stable performance and easy addition will greatly increase the specific gravity of the material, which is in line with the current development trend of lightweight does not match

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