Blended rubber gasket for fuel cells

Patent metadata

Field	Value
Publication number	US-9466844-B2
Application number	US-201414313238-A
Country	US
Kind code	B2
Filing date	Jun 24, 2014
Priority date	Dec 27, 2013
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

The present invention provides a blended rubber gasket for fuel cells that includes a base having about 80 to 99 phr of EPDM rubber and about 1 to 20 phr of FKM rubber, and about 0.1 to 10 phr of a peroxide crosslinking agent, based on 100 phr of the base.

First claim

What is claimed is:

1. A blended rubber gasket for fuel cells, comprising:
a base including 95 to 99 parts per hundred rubber (phr) of ethylene propylene diene monomer (EPDM) rubber and 1 to 5 phr of FKM rubber; and
0.1 to 5 phr of a peroxide crosslinking agent,
based on 100 phr of the base,
wherein the EPDM rubber and FKM rubber are co-crosslinked by the peroxide crosslinking agent,
wherein a compression set of co-crosslinked EPDM rubber and FKM rubber heat-treated at 100° C. for 72 hours is 4.2% or less, heat-treated at 150° C. for 72 hours is 18.1% or less, as measured according to ASTM D395 (Method B, 25% Deflection).

2. The blended rubber gasket for fuel cells of claim 1 , wherein the EPDM rubber includes 55 to 60 wt. % of ethylene and to 10 wt. % of a diene monomer, based on the total amount of EPDM rubber.

3. The blended rubber gasket for fuel cells of claim 1 , wherein the FKM rubber includes 60 to 70 wt. % of fluorine, based on the total amount of FKM rubber.

4. The blended rubber gasket for fuel cells of claim 1 , wherein the peroxide crosslinking agent includes at least one selected from the group consisting of: dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, di-(2-t-butylperoxyisopropyl)benzene, di-(2,4-dichlorobenzoyl) peroxide, di(4-methylbenzoyl) peroxide, t-butyl peroxybenzoate, dibenzoyl peroxide, 1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane, t-butyl cumyl peroxide, and di-t-butyl peroxide.

5. The blended rubber gasket for fuel cells of claim 1 , further comprising at least one auxiliary substance selected from the group consisting of: a co-crosslinking agent, a crosslinking accelerator, a reinforcing filler, an antioxidant, an antiaging agent, a release agent, a plasticizer, a processing aid, a coupling agent and a tackifier in an amount of 0.1 to 10 phr, based on 100 phr of the base.

6. The blended rubber gasket for fuel cells of claim 1 , wherein the blended rubber gasket is integrated with a membrane-electrode assembly (MEA), a gas diffusion layer (GDL), a separator or a polymer frame of a fuel cell by an injection molding process.

Assignees

• Hyundai Motor Co Ltd
• Nat Univ Chonbuk Ind Coop Found

Inventors

• Jeong Byeong-Heon
• Hong Bo Ki
• Nah Changwoon
• Yoo Yong Hwan

Classifications

• C08L23/16 Primary

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M8/0286

  Processes for forming seals · CPC title

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M8/0284 Primary

  Organic resins; Organic polymers · CPC title