Rubber composition, aging-resistant rubber product using the same

{
  "publication_number": "US11479661B2",
  "country": "US",
  "kind": "B2",
  "title": "Rubber composition, aging-resistant rubber product using the same",
  "abstract": "The present invention discloses a rubber composition, a processing method thereof, and an aging resistant rubber product using the rubber composition. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an EPM and an EPDM with a content represented as B, in which 0≤B<100 parts; and the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer. The rubber composition provided by present invention has good processability and can be used for producing rubber products with high aging resistance and compression set resistance.",
  "claims": [
    "1. A rubber composition, comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤b<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of from 60 to 105 branches/1000 carbon atoms, a weight average molecular weight of from 268,000 to 518,000, and a Mooney viscosity ML(1+4) at 125° C. of from 42 to 102.",
    "2. The rubber composition according to claim 1, wherein based on 100 parts by weight of the rubber matrix, the content of the branched polyethylene is A, in which 10≤A≤100 parts; said ethylene-propylene rubber is consisted of EPM and EPDM, and the content of EPM and EPDM is B, in which 0≤B≤90 parts, wherein the branched polyethylene is an ethylene homopolymer having a degree of branching of from 82 to 105 branches/1000 carbon atoms, a weight average molecular weight of from 268,000 to 401,000, and a Mooney viscosity ML(1+4) at 125° C. of from 42 to 101.",
    "3. The rubber composition according to claim 1, comprising a rubber matrix and essential components, wherein the rubber matrix comprises, in parts by weight, 100 parts of a branched polyethylene; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 8-150 parts of a plasticizer.",
    "4. The rubber composition according to claim 1, wherein the crosslinking agent comprises at least one of a peroxide crosslinking agent and sulfur, wherein the peroxide crosslinking agent comprises at least one of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, tert-butyl peroxybenzoate, and tert-butylperoxy-2-ethylhexyl carbonate; the reinforcing filler comprises at least one of carbon black, silica, calcium carbonate, talc, calcined clay, magnesium silicate, and magnesium carbonate; the plasticizer comprises at least one of pine tar, motor oil, naphthenic oil, paraffin oil, coumarone, RX-80, stearic acid, paraffin, and liquid polyisobutene.",
    "5. The rubber composition according to claim 1, further comprising auxiliary components, which comprise, based on 100 parts by weight of the rubber matrix, 0.2 to 10 parts of an auxiliary crosslinking agent, 0.5 to 3 parts of a stabilizer, 2 to 15 parts of a metal oxide, and 0 to 3 parts of a vulcanization accelerator; the auxiliary crosslinking agent comprises at least one of triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, ethyl dimethacrylate, triethylene glycol dimethacrylate, triallyl trimellitate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, N,N′-m-phenylene bismaleimide, N,N′-bis(furfurylidene) acetone, 1,2-polybutadiene, paraquinonedioxime, sulfur, and a metal salt of an unsaturated carboxylic acid; the metal oxide comprises at least one of zinc oxide, magnesia, calcium oxide, lead monoxide, and lead tetroxide; the stabilizer comprises at least one of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, and 2-mercaptobenzimidazole; the vulcanization accelerator comprises at least one of 2-mercaptobenzothiazole, dibenzothiazyl disulfide, tetramethyl thiuram monosulfide, tetramethyl thiuram disulfide, tetraethyl thiuram disulfide, N-cyclohexyl-2-benzothiazole sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, bismaleimide, and ethylene thiourea.",
    "6. A rubber support, wherein, a rubber compound used for the rubber support comprises a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of not less than 50 branches/1000 carbon atoms, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML(1+4) at 125° C. of not less than 2; and wherein either: the rubber support is a plate-type rubber support of bridge and comprises a steel plate and a rubber sheet, wherein the rubber sheet comprises the rubber compound; the rubber support is a basin-type rubber support and comprises a rubber bearing plate comprising the rubber compound; or the rubber support is a vehicle shock-absorbing support.",
    "7. An aging resistant rubber product, wherein, a rubber compound used for the aging resistant rubber product comprises a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of not less than 50 branches/1000 carbon atoms, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML(1+4) at 125° C. of not less than 2.",
    "8. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber expansion and contraction installation for bridge, which comprises a rubber expansion and contraction body, the rubber compound used for said rubber expansion and contraction body comprises said rubber composition.",
    "9. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber and steel plate composite expansion and contraction installation, which comprises a rubber expansion and contraction body, the rubber compound used for said rubber expansion and contraction body comprises said rubber composition.",
    "10. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber railway pad.",
    "11. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber fender.",
    "12. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber water stop.",
    "13. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber roller.",
    "14. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a high temperature-resistant ribbed belt.",
    "15. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a windshield wiper.",
    "16. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a waterproof coil.",
    "17. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is an inner tire.",
    "18. The rubber composition according to claim 1, wherein the ethylene homopolymer has a degree of branching of from 60 to 102 branches/1000 carbon atoms.",
    "19. The rubber composition according to claim 1, wherein the ethylene homopolymer has a degree of branching of from 82 to 102 branches/1000 carbon atoms."
  ],
  "description_excerpt": "The present invention relates to the technical field of rubber, and in particular to a rubber composition, and a processing method thereof, and further to aging-resistant rubber product using the rubber composition and a production method thereof.\n\nDue to its excellent aging resistance and good compression set resistance, ethylene-propylene rubber is widely used in various situations where high aging resistance and/or compression set resistance are required. Sulfur vulcanization and peroxide vulcanization are two conventional vulcanization methods for ethylene-propylene rubber. In order to obtain better aging resistance and compression set resistance, peroxide crosslinking systems are now gradually used. However, the mechanical strength of peroxide-vulcanized ethylene-propylene rubber is lower than that of sulfur-vulcanized ethylene-propylene rubber, which will lead to an increased risk of damage to the product during actual use. Therefore, there is an urgent technical problem to improve both the aging resistance and the mechanical strength of ethylene-propylene rubber.\n\nEthylene-propylene rubbers are a kind of synthetic rubbers with a saturated molecular backbone, and include ethylene-propylene monomer (EPM) and ethylene-propylene-diene monomer (EPDM), both of which have good aging resistance. EPDM is commonly used in the ethylene-propylene rubber products. However, since EPDM contains a third monomer with a molecular chain having a double bond and EPM has a completely saturated molecular chain, EPM has more excellent aging resistance.",
  "cpc": [
    "C08L 23/06",
    "B60C 1/00",
    "B60S 1/38",
    "B60S 2001/3829",
    "C08K 2003/2296",
    "C08L 2205/025",
    "C08L 2205/03",
    "C08L 2205/06",
    "C08L 2207/07",
    "C08L 2207/322",
    "C08L 23/16",
    "C08L 2312/00",
    "E01D 19/041",
    "E01D 19/06",
    "F16F 1/3605",
    "F16G 1/06",
    "F16G 5/04"
  ],
  "ipc": [
    "B60C 1/00",
    "B60S 1/38",
    "C08L 23/06",
    "C08L 23/16",
    "E01D 19/04",
    "E01D 19/06",
    "F16F 1/36",
    "F16G 1/06"
  ],
  "assignees": [
    "Hangzhou Xinglu Technology Co Ltd"
  ],
  "inventors": [
    "Tao Xu",
    "Zhi Sheng FU",
    "An Yang WU"
  ],
  "filing_date": "2018-01-12",
  "publication_date": "2022-10-25",
  "grant_date": "2022-10-25",
  "priority_date": "2017-01-13",
  "application_number": "US-201816477747-A",
  "family_id": "62924800",
  "cited_by_count": 12,
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}