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Nitrile/EPDM for ozone and low temperature resistant seals

A technology of EPDM rubber and nitrile rubber, which is applied in the field of rubber seals, can solve the problems of poor sunlight crack resistance, narrow heat resistance temperature range, poor ozone resistance and low temperature resistance, and achieve excellent durability. Weather resistance, improved tear strength, improved cross-linking effect

Active Publication Date: 2011-11-30
TIANJIN PENGYI GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is exactly to provide a kind of nitrile rubber / ethylene propylene diene monomer (NBR / EPDM) and the sealing ring rubber of resistance to ozone and low temperature resistance used together, to solve the ozone resistance and low temperature resistance of seal products using nitrile rubber alone The shortcomings of poor performance, poor sunlight crack resistance and narrow heat-resistant temperature range make it resistant to ozone and low temperature and have a wide range of operating temperature to meet the performance requirements of the current use environment for sealing ring products

Method used

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  • Nitrile/EPDM for ozone and low temperature resistant seals
  • Nitrile/EPDM for ozone and low temperature resistant seals

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Embodiment Construction

[0022] According to the raw materials in the formula of the embodiment, the film is made into a film for testing and testing. The performance comparison between the formula of nitrile rubber / EPDM (NBR / EPDM) ozone-resistant and low-temperature resistant sealing ring and the formula of nitrile rubber without EPDM is as follows:

[0023]

[0024] The usual conditions are: the ozone resistance of ordinary NBR formula film can reach the experimental condition of 50pphm / 40℃ / 72h / 20% without cracking, and the experimental condition of low temperature resistance is -30℃ / 22h. There is no cracking, and after the heat-resistant air aging test condition is 100℃×72h, the hardness change is within 0~+15, the change rate of tensile strength is within -15, and the change rate of elongation at break is within -50.

[0025] And we use more severe conditions, through the performance comparison analysis of the ozone-resistant low-temperature resistance formula of the nitrile rubber / EPDM blend ...

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Abstract

The invention relates to a nitrile rubber / ethylene-propylene-diene rubber used for an ozone resistant and low temperature resistant sealing ring. The rubber comprises the following components of: a nitrile rubber, an ethylene-propylene-diene rubber, a compatibilizer CPE, an anti-aging agent MB, stearic acid, paraffin wax, a plasticizer DOP, carbon block N550, pottery clay, a coupling agent KH-550, high styrene, a neutralizer TRA, a cross-linking agent DCP, a cross-linking aid TMPTMA and a cross-linking aid TAIC, wherein the nitrile rubber and the ethylene-propylene-diene rubber are used together to make up deficiencies of each other so that the poor ozone resistance, poor low temperature resistance and narrower heat resistant temperature range of the nitrile rubber can be improved and theuse temperature range of the product can be also expanded. After a small quantity of EPDMs (Ethylene-Propylene-Diene Monomers) are added to the nitrile rubber, the ozone resistance, the low temperature resistance and the heat resistance of the blended rubber product can be improved; meanwhile, the rubber product obtains wider use temperature range, better process performance and lower raw material and production cost while being compared with the nitrile rubber and the chloroprene rubber; and the requirements on the performance of domestic parts are satisfied.

Description

technical field [0001] The invention relates to a rubber sealing member, in particular to an ozone-resistant and low-temperature resistant sealing ring used in combination with nitrile rubber / ethylene propylene diene monomer (NBR / EPDM). Background technique [0002] The main rubber materials used in my country's transformer seal gasket products are nitrile rubber (NBR) and chloroprene rubber (CR). Butadiene rubber itself has excellent oil resistance and wear resistance, but due to the poor ozone resistance and low temperature resistance of NBR, especially when the rubber is under a large stress, its ozone cracks relatively quickly, so in the transformer The service life of the electric porcelain bushing seal, etc. is short. EPDM rubber is a highly saturated rubber with good heat resistance, low temperature resistance, ozone resistance and electrical insulation properties, but its own oil resistance and adhesion are poor. If the two materials can be blended, the weak proper...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L23/16C08L23/28C08L9/08C08K13/02C08K5/47C08K5/12C08K3/04C08K3/34C08K5/14C08K5/3492
Inventor 张洪起李智
Owner TIANJIN PENGYI GRP CO LTD
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