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Rubber composition

A rubber composition and rubber technology, applied in the direction of electrochemical generators, fuel cell parts, fuel cells, etc., can solve the problems of easy adhesion, weak green strength, raw material fracture, etc., and achieve excellent resistance to compression set Characteristics, effect of improving roll workability

Inactive Publication Date: 2020-11-24
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Here, although butene is copolymerized as α-olefin of ethylene-α-olefin-diene copolymer rubber, it exhibits low-temperature properties because it is superior in flexibility compared to EPDM, but it exhibits easy adhesion, and at room temperature under creep (cold flow)
Such a copolymer rubber has weak green strength, and for example, in the injection molding and extrusion molding of rubber, when the rubber raw material in the form of a strip is supplied to the screw, the raw material breakage may become a problem.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0039] For the preparation of the rubber composition, it can be obtained by mixing the above-mentioned various materials using a mixer such as a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, a kneader, a high-shear type mixer, etc. Melting and kneading are carried out at a melting temperature of 120 to 150°C.

[0040] In addition, the crosslinking of the rubber composition can be carried out by using an injection molding machine, a compression molding machine, etc., usually by pressurized crosslinking at about 155 to 230° C. for about 0.5 to 30 minutes. In addition, after performing the above-mentioned primary crosslinking, in order to ensure crosslinking up to the inside of the crosslinked product, secondary crosslinking may be performed if necessary. The secondary crosslinking can be carried out by heating in an oven usually at about 150 to 250° C. for about 0.5 to 24 hours.

[0041] The rubber cross-linked molded product obtained by cross-linking a...

Embodiment 1

[0046]

[0047] Each of the above components except the organic peroxide was kneaded using a 120° C. kneader, and then the organic peroxide was added and kneaded using an open roll.

[0048] The kneaded product was crosslinked at 180° C. for 10 minutes, followed by oven crosslinking at 150° C. for 24 hours to obtain a crosslinked molded product. With regard to the kneaded product and the cross-linked molded product, the following items were evaluated and measured.

[0049] Roll processability:

[0050] ○Roll winding is good

[0051] ×Does not wrap around the roll

[0052] Intrusion of raw materials to the screw:

[0053] ○The intrusion of raw materials to the screw is good

[0054] ×The rubber material breaks due to the shearing of the screw

[0055] Compression set:

[0056] Laminate three sheets with a thickness of 2 mm, for 95 ° C in air, 500 hours, 25%

[0057] The compression set after compression was measured

[0058] Measurement method 1: JIS K6262 standard c...

Embodiment 2

[0070] In Example 1, the amount of the ethylene-octene copolymer was changed to 7 parts by weight.

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Abstract

A rubber composition which comprises 100 parts by weight of an ethylene / butene / diene copolymer rubber and 2.5-7.5 parts by weight of an ethylene / alpha-olefin copolymer having a melting point of 100 DEG C or higher and a glass transition temperature Tg of -55 DEG C or lower. The rubber composition has improved processability concerning roll processability and tendency to be caught in screws, whileretaining the compression set characteristics (95 DEG C, 500 hours), low-temperature retraction test (evaluated in terms of TR10 value and TR70 value), etc. which are properties of the ethylene / butene / diene copolymer rubber. The rubber composition can retain excellent compression set characteristics under environments where fuel batteries are used.

Description

technical field [0001] The present invention relates to rubber compositions. More specifically, it relates to a rubber composition that is effectively used as a cross-linked molding material and the like for a sealing material for a solid polymer fuel cell separator. Background technique [0002] Not only do fuel cells hardly require the use of fossil fuels, which must pay attention to the depletion of resources, but they also have excellent properties such as generating almost no noise during power generation, and the energy recovery rate is higher than other energy generation mechanisms, so they are used in households, automobiles, etc. began to be put into practical use. [0003] Among them, solid polymer fuel cells operate at a lower temperature than other types of fuel cells, so there is no need to worry about corrosion for the components constituting the battery, and it has the advantage of being able to discharge a relatively large current when operating at low tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K5/14H01M8/0284H01M8/10
CPCC08K5/14H01M8/0284Y02E60/50H01M2008/1095C08L23/16C08L23/0815C08K3/04H01M8/10C08L47/00C08L2207/04
Inventor 铃木昭宽川崎邦义
Owner NOK CORP
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