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EPDM composition

A composition and filler technology, applied in the field of EPDM compositions, can solve the problems of long time, poor processability, poor moldability, easy foaming, etc., and achieve excellent foaming resistance, excellent moldability, and air tightness. Excellent effect

Inactive Publication Date: 2008-06-18
NOK CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an air conditioner or refrigerator in actual use, the sealing material is exposed to a state where chlorofluorocarbon gas, refrigerator oil, built-in oil, etc. are mixed. It is easy to foam, and it cannot be said that the above-mentioned proposed material has sufficient foam resistance
[0009] However, the aforementioned Patent Document 2 proposes to use the Mooney viscosity ML 1+4 (100°C) is about 50 or more ethylene-propylene-based copolymer rubber to improve (even if the effect is slight) swelling caused by lubricating oil (mineral oil), but the rubber material with such a high Mooney viscosity, its processability , Poor moldability, not necessarily satisfactory for molding sealing materials
[0010] In addition, various refrigerants are being researched to replace chlorofluorocarbon R134a, but it will take a long time for practical use

Method used

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  • EPDM composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] EPDM (Mitsui Chemicals EPT4045; ethylene content 54%

[0048] 100 parts by weight

[0049] Weight, Mooney Viscosity ML 1+4 (100°C)45)

[0050] SRF carbon black (average particle diameter 70nm) 70 parts by weight

[0051] Zinc oxide 5 parts by weight

[0052] 1 part by weight of anti-aging agent (Nocrack CD of Ouchi Shining Chemical Co., Ltd.)

[0053] 2.5 parts by weight of dicumyl peroxide

[0054] Use a kneader and an open roll to knead the above components. For the kneaded product, use a vulcanization press to vulcanize under pressure at 170° C. for 15 minutes and use a hot oven for secondary vulcanization at 150° C. for 5 hours to obtain vulcanized flakes (150× 150×2mm) and P-24 size O-rings.

Embodiment 2

[0056] In Example 1, the amount of SRF carbon black was changed to 25 parts by weight, and 30 parts by weight of white carbon black (specific surface area 90m 2 / g) and 2 parts by weight of vinyltrimethoxysilane.

Embodiment 3

[0058] In Example 1, the amount of SRF carbon black was changed to 50 parts by weight, and 30 parts by weight of aluminum silicate (average particle diameter: 1.4 μm) and 2 parts by weight of vinyltrimethoxysilane were further added and used.

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Abstract

An EPDM composition which contains, as a crosslinking agent, an organic peroxide in an amount of 0.2 to 4.0 parts by weight relative to 100 parts by weight of EPDM having an ethylene content of 50 to 58% by weight and a Mooney viscosity (ML1+4) (at 100 DEG C) of 10 to 48. The EPDM composition shows an excellent blistering resistance under co-presence of flon gas / refrigerating machine oil which is a matter of concern in practical use as a rubbery material for molding a sealing material for a flon-type cooling medium (e.g., R134a), and also shows an excellent molding property. A sealing material produced by vulcanization-molding the EPDM composition, when used for sealing of a flon-type cooling medium, shows a smaller amount of permeation / leak of the cooling medium compared to that in a sealing material comprising hydrogenated NBR which has been used as a shaft seal for a compressor provided in an automotive air-conditioning system.

Description

technical field [0001] The present invention relates to EPDM compositions. More specifically, it relates to an EPDM composition suitable for use as a molding material (molding material) or the like of a sealing material having excellent resistance to chlorofluorocarbon gas and refrigerating machine oil, and having a low leakage rate of chlorofluorocarbon refrigerant. few. Background technique [0002] Ethylene-propylene-based copolymer rubber is the most resistant to air conditioner refrigerant R134a (1,1,1,2-tetrafluoroethane), but it has no resistance to some refrigerator oils or built-in oils, so Hydrogenated NBR is used as a sealing material for air conditioners and refrigerants. [0003] Non-Patent Document 1: Journal of Japan Gomu Association Vol. 64, p. 161 (1991) [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 7-118447 [0005] However, in recent years, in order to ensure the sealing performance at low temperature vibration, the demand for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K3/04C08K3/34C08K5/14C08K7/00C09K3/10F16J15/10
CPCC09K2200/0642C08K5/14C09K2200/0208C08L23/16F16J15/102C09K2200/0243C09K3/10C08L2312/00C08K3/04C08K3/22C08K3/34C08K5/54C08L2666/02F16J15/10
Inventor 雨宫崇小林修
Owner NOK CORP
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