Photo-crosslinked rubber composition, and rubber product using the same
The present invention discloses a photo-crosslinked rubber composition and application thereof. The rubber composition comprises a rubber matrix and an initiator. 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, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100; and the initiator accounts for 0.1-10 parts, and the initiator includes at least one of a cationic photoinitiator and a free radical photoinitiator. In the rubber composition, the ethylene-propylene rubber is partially or completely replaced by the branched polyethylene. The rubber composition can be used for rubber product crosslinked by ultraviolet light, including wire, cable, film, glove, condom, and medical catheter, which achieves excellent elasticity, electrical insulation property, aging resistance and ozone resistance, and also has good mechanical strength.
1. A rubber composition, comprising a rubber matrix and an initiator, 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, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100; based on 100 parts by weight of the rubber matrix, the initiator accounts for 0.1-10 parts, and the initiator includes at least one of a cationic photoinitiator and a free radical photoinitiator, wherein the branched polyethylene is an ethylene homopolymer having a degree of branching of from 60 to 105 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.
2. The rubber composition according to claim 1 , wherein the content of the initiator is 0.5-5 parts, based on 100 parts by weight of the rubber matrix.
3. The rubber composition according to claim 1 , wherein the cationic photoinitiator comprises at least one of an aromatic diazonium salt, a diaryliodonium salt, a triarylsulfonium salt, an alkylsulfonium salt, a ferrocene salt, a sulfonyloxyketone and a triarylsiloxane, and the triarylsulfonium salt is triarylsulfonium hexafluorophosphate.
4. The rubber composition according to claim 1 , wherein the free radical photoinitiator comprises at least one of an intramolecular cleavage type photoinitiator and an intermolecular hydrogen abstraction type photoinitiator, and the intramolecular cleavage type photoinitiator or the intermolecular hydrogen abstraction type photoinitiator is at least one of benzophenone, diphenylethanone, dialkoxyacetophenone, benzoin dimethyl ether, α-hydroxyisobutyrylbenzene, acylphosphine oxide, benzoin isopropyl ether, benzoin n-butyl ester, anthraquinone, and fluorenone.
5. The rubber composition according to claim 1 , wherein the rubber composition further comprises auxiliary components, and based on 100 parts by weight of the rubber matrix, the auxiliary components comprise 0.1-5 parts of a crosslinking agent, 0.01-2 parts of an antioxidant, 3-25 parts of a plasticizer, 0-10 parts of a metal oxide, 0-200 parts of an inorganic filler, and 0.3-5 parts of a coupling agent.
6. The rubber composition according to claim 5 , wherein the crosslinking agent comprises at least one of triallyl cyanurate, triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triallyl ether, and pentaerythritol ester tetraallyl ether.
7. The rubber composition according to claim 5 , wherein the plasticizer comprises at least one of polyethylene wax, pine tar, motor oil, aromatic oil, naphthenic oil, paraffin oil, microcrystalline wax, and coumarone resin; the metal oxide comprises at least one of zinc oxide, magnesium oxide, calcium oxide, lead monoxide, and lead tetraoxide; the inorganic filler comprises at least one of silica, calcium carbonate, talcum powder, calcined clay, magnesium silicate, magnesium carbonate, aluminum hydroxide, and magnesium hydroxide; the coupling agent comprises at least one of vinyl tris(2-methoxyethoxy)silane, 3-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and 3-methacryloxypropyltrimethoxysilane; the antioxidant comprises at least one of 2,6-di-tert-butylphenol, 2,4,6-tri-tert-butylphenol, 4,4′-thiobis(6-tert-butyl-3-methylphenol), triphenyl phosphite, tris(2,4-di-tert-butylphenyl)phosphite, triisooctyl phosphite, tricresyl phosphate, pentaerythritol tetrakis(3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)propionate), dilauryl thiodipropionate, lauryl-stearyl thiodipropionate, and ditridecyl 3,3′-thiodipropionate.
8. The rubber composition according to claim 1 , 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 10≤A≤100, said ethylene-propylene rubber is consisted of EPM and EPDM, and the EPM and EPDM with a total content represented as B, in which 0≤B≤90; and the branched polyethylene is characterized by having a degree of branching of from 80 to 105 branches/1000 carbon atoms, a weight average molecular weight of 66,000-518,000, and a Mooney viscosity ML (1+4) at 125° C. of 6-102.
9. A wire, comprising a conductor layer and an insulating layer, wherein, said insulating layer comprises a rubber compound according to claim 1 .
10. A cable, comprising a conductor layer, an insulating layer and a sheathing layer, wherein, said insulating layer and sheathing layer comprises a rubber compound according to claim 1 .
11. A photo-crosslinked rubber product, wherein, the rubber compound used for said photo-crosslinked rubber product comprises said rubber composition according to claim 1 .
12. The photo-crosslinked rubber product according to claim 11 , wherein, said photo-crosslinked rubber product is a medical catheter.
13. The photo-crosslinked rubber product according to claim 11 , wherein, said photo-crosslinked rubber product is a condom.
14. The photo-crosslinked rubber product according to claim 11 , wherein, said photo-crosslinked rubber product is a glove.