Rubber composition for fuel-cell cooling hose and fuel-cell cooling hose using same

Patent metadata

Field	Value
Publication number	US-11795313-B2
Application number	US-202117325551-A
Country	US
Kind code	B2
Filing date	May 20, 2021
Priority date	Sep 21, 2020
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A rubber composition for a fuel-cell cooling hose may include: a base resin including an ethylene-propylene-diene monomer (EPDM); a reinforcing agent; an activating agent; a plasticizer; and a crosslinking agent.

First claim

What is claimed is:

1. A rubber composition for a fuel-cell cooling hose, the rubber composition comprising:
40 to 62 wt % of a base resin comprising an ethylene-propylene-diene monomer (EPDM);
30 to 52 wt % of a reinforcing agent;
2 to 4 wt % of an activating agent;
2 to 3 wt % of a plasticizer; and
1 to 2 wt % of a crosslinking agent,
wherein the reinforcing agent comprises at least one material selected from a group consisting of carbon black, silica, calcium carbonate, and combinations thereof, and
the carbon black has a dibutylphthalate (DBP) oil absorption rate of 40 to 150 ml/100 g and an iodine adsorption number I2 of 10 to 50 mg/g.

2. The rubber composition of claim 1 , wherein the base resin comprises at least one material selected from a group consisting of a metallocene-based EPDM, a Ziegler-Natta-based EPDM, and combinations thereof.

3. The rubber composition of claim 2 , wherein the base resin comprises:
the metallocene-based EPDM, or
the metallocene-based EPDM and the Ziegler-Natta-based EPDM at a weight ratio of 1:0.3-2.5.

4. The rubber composition of claim 1 , wherein the activating agent comprises:
0.5 to 1 wt % of zinc oxide (ZnO);
0.5 to 1 wt % of a thermoplastic olefin (TPO); and
1 to 2 wt % of stearic acid.

5. The rubber composition of claim 4 , wherein a weight ratio of the zinc oxide (ZnO) to the thermoplastic olefin (TPO) is 1: 1-2.

6. The rubber composition of claim 4 , wherein the thermoplastic olefin (TPO) has a specific gravity of 0.85 to 0.9 g/cm 3 and a melt index (MI) of 0.3 to 0.7 g/10 min (190° C./2.16 kg).

7. The rubber composition of claim 1 , wherein the plasticizer comprises at least one substance selected from a group consisting of paraffin oil, naphthalene oil, aromatic oil, and combinations thereof.

8. The rubber composition of claim 1 , wherein the crosslinking agent comprises at least one compound selected from a group consisting of dicumyl peroxide (DCP), butyl peroxybenzoate, butylperoxy hexane, and combinations thereof.

9. The rubber composition of claim 1 , further comprising 1 to 2 wt % of an anti-aging agent.

10. A fuel-cell cooling hose having an ion dissolution rate of 0.7 to 7.0 μS/cm and manufactured by crosslinking a rubber composition, wherein the rubber composition comprises:
40 to 62 wt % of a base resin comprising an ethylene-propylene-diene monomer (EPDM);
30 to 52 wt % of a reinforcing agent;
2 to 4 wt % of an activating agent;
2 to 3 wt % of a plasticizer; and
1 to 2 wt % of a crosslinking agent.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Park Jong Min
• Cho Yong Jun

Classifications

• C08L23/16 Primary

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

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K3/04

  Carbon · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/0016

  Plasticisers · CPC title