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US 11,629,248 B2Granted
Rubber composition having improved electrical insulation properties for reducing galvanic corrosion
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorJong Min Park
Life of this patent
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Abstract
A rubber composition having improved electrical insulation properties for reducing galvanic corrosion, a method of preparing the composition, and a rubber hose for vehicles using the composition are disclosed. The rubber composition includes a base polymer, a reinforcing agent, an anti-aging agent, an activating agent, a plasticizer, and a crosslinking agent, and has electrical insulation resistance (107 Ω·cm) of 50 or more.
Claims13
A rubber composition for preventing galvanic corrosion, the rubber composition comprising:
- a base polymer, a reinforcing agent, an anti-aging agent, an activating agent, a plasticizer, and a crosslinking agent,
- wherein the base polymer comprises a first ethylene propylene diene monomer (EPDM) rubber and a second EPDM rubber,
- wherein the first EPDM rubber is EPDM comprising 8% to 10% of 5-ethylidene-2-norbornene (ENB),
- wherein the second EPDM rubber is EPDM comprising 70% to 75% of ethylene,
- wherein a weight ratio of the first EPDM rubber and the second EPDM rubber is 30 to 50:50 to 70,
- wherein the reinforcing agent comprises carbon black and an inorganic filler and wherein, based on 100 parts by weight of the base polymer, an amount of the carbon black is 30 to 50 parts by weight and an amount of the inorganic filler is 25 to 45 parts by weight, and
- wherein the inorganic filler is silica and wherein the silica has Brunauer, Emmett, and Teller (BET) surface area (m2/g) of 180 to 230 and a density (g/l) of 120 to 160.
4 more elements
A method of preparing a rubber composition, the method comprising:
- mixing a base polymer with a reinforcing agent, an anti-aging agent, an activating agent, and a plasticizer;
- and
- mixing the mixed polymer with a crosslinking agent,
- wherein the base polymer comprises a first EPDM rubber and a second EPDM rubber,
- wherein the first EPDM rubber is EPDM comprising 8% to 10% of 5-ethylidene-2-norbornene (ENB),
- wherein the second EPDM rubber is EPDM comprising 70% to 75% of ethylene,
- wherein a weight ratio of the first EPDM rubber and the second EPDM rubber is 30 to 50:50 to 70,
- wherein the reinforcing agent comprises carbon black and an inorganic filler, and wherein, based on 100 parts by weight of the base polymer, an amount of the carbon black is 30 to 50 parts by weight and an amount of the inorganic filler is 25 to 45 parts by weight, and
- wherein the inorganic filler is silica and wherein the silica has Brunauer, Emmett, and Teller (BET) surface area (m2/g) of 180 to 230 and a density (g/l) of 120 to 160.
6 more elements
Dependencies are inferred from the claim text.