Composition for semiconductive rubber, crosslinked rubber product, and semiconductive parts
View Patent ↗A composition for a semiconductive rubber, comprising an epichlorohydrin-based rubber (a), an ethylene oxide-modified (meth)acrylate (b), and at least one kind of a crosslinking agent (c) selected from the group consisting of a sulfur-based crosslinking agent, a quinoxaline-based crosslinking agent and a triazine-based crosslinking agent.
1. A composition for a semiconductive rubber, comprising an epichlorohydrin-based rubber (a), an ethylene oxide-modified (meth)acrylate (b) represented by the following general formula (I), and at least one kind of a crosslinking agent (c) selected from the group consisting of a sulfur-based crosslinking agent, a quinoxaline-based crosslinking agent and a triazine-based crosslinking agent:
wherein n represents an integer of 1 to 30, and R 1 to R 4 are the same or different and represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a substituted alkyl group having 1 to 5 carbon atoms, and
wherein an amount of the ethylene oxide-modified (meth)acrylate blended is from 8 to 35 parts by weight.
2. The composition for a semiconductive rubber according to claim 1 , wherein the ethylene oxide-modified (meth)acrylate (b) is a methoxypolyethylene glycol methacrylate represented by the general formula (II):
wherein n represents an integer of 1 to 20.
3. The composition for a semiconductive rubber according to claim 2 , wherein the methoxypolyethylene glycol methacrylate represented by the general formula (II) includes 6 to 16 ethylene oxide units (having a structure of the general formula (II) in which n is from 6 to 16).
4. The composition for a semiconductive rubber according to claim 1 , wherein the epichlorohydrin-based rubber (a) is at least one kind selected from the group consisting of an epichlorohydrin homopolymer, an epichlorohydrin-ethylene oxide dicopolymer and an epichlorohydrin-ethylene oxide-allyl glycidyl ether tercopolymer.
5. The composition for a semiconductive rubber according to claim 1 , wherein the epichlorohydrin-based rubber (a) is a tercopolymer of epichlorohydrin-ethylene oxide-allyl glycidyl ether, or a blend of a tercopolymer of epichlorohydrin-ethylene oxide-allyl glycidyl ether with an epichlorohydrin homopolymer, or a blend of a tercopolymer of epichlorohydrin-ethylene oxide-allyl glycidyl ether with an epichlorohydrin-ethylene oxide dicopolymer.
6. A crosslinked rubber product obtained by crosslinking the composition for a semiconductive rubber according to claim 1 .
7. A semiconductive part using the crosslinked rubber product according to claim 6 .