摘要:
A method for manufacturing a flame-retardant insulated wire and cable for use in nuclear power stations, comprises the steps of: extruding on a conductor or cable care to a predetermined thickness a composition consisting of 100 parts by weight of a basic polymer such as a thermoplastic resin or a rubber which can be crosslinked by an organic peroxide-based crosslinking agent, at least 10 parts by weight of a halogenated acenaphthylene or a condensate thereof, and 0.5 to 10 parts by weight of an organic peroxide; and heating a resultant wire or cable for crosslinking in the absence of water and at a temperature higher than the decomposition temperature of the organic peroxide.
摘要:
A process for producing molded product composed of crosslinked resin or coated material composed of crosslinked resin on a substrate which comprises blending a polyolefin-series resin, a compound represented by the formulaX -- Y.sub.m Iwherein X is a group not containing an acetylenic linkage, Y is a group containing an acetylenic linkage and m is an integer of 1 or more, which is compatible with the resin at a room temperature or an elevated temperature, and a compound selected from the group consisting of an amino compound represented by the formula ##STR1## wherein each of R.sub.1 and R.sub.2 is independently substituted or non-substituted aliphatic hydrocarbon, substituted or non-substituted alicyclic hydrocarbon, or substituted or non-substituted aromatic hydrocarbon, provided that at least one of R.sub.1 or R.sub.2 is substituted or non-substituted aromatic hydrocarbon, an amino compound represented by the formula ##STR2## wherein each of R.sub.3, R.sub.4 and R.sub.5 is independently substituted or non-substituted aliphatic hydrocarbon, substituted or non-substituted alicyclic hydrocarbon, or substituted or non-substituted aromatic hydrocarbon, provided that at least one of R.sub.3, R.sub.4 and R.sub.5 is substituted or non-substituted aromatic hydrocarbon; and mixtures thereof which are compatible with the resin at a room temperature or an elevated temperature; and molding the mixture or coating the mixture on a substrate and irradiating the resulting molded material or the resulting coated material by means of an electron beam.
摘要:
A flame-retardant and radiation-resistant polymer composition comprising a polymer and a halogenated acenaphthylene condensate having a structural unit of the formula (I) or (II): ##STR1## (wherein X is chlorine or bromine, n and n' are each an integer of 2 to 6, R is a substituent other than halogen, m and m' are each an integer of 0 to 4, n (or N')+m(or m').ltoreq.6, and when m or m' is 2 or more, each R may be the same or different) and a flame-retardant and radiation-resistant resin molded product prepared therefrom are herein disclosed.
摘要:
A method of manufacturing shaped articles of cross-linked poly-.alpha.-olefin composition by irradiation of electron beam which comprises the steps of blending a poly-.alpha.-olefin with a compound miscible therewith which is expressed by the general formula:X--Ym(where X is a group free from acetylenic linkage, Y is a group containing acetylenic linkage and m is an integer of 1 or over) and tetrakis-[methylene-(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)]-methane; molding the blended mass into a desired shape; and cross-linking said shaped articles by irradiation of electron beam.
摘要:
To provide an epoxy-resin composition and prepreg for producing a fiber-reinforced composite material which exhibits excellent curability and has excellent flame retardance and heat resistance, as well as to provide fiber-reinforced composite materials produced using the prepreg and to provide housing for electronic/electrical devices. The epoxy resin composition contains component (A): a phosphorus compound; component (B): an epoxy resin which has at least three epoxy groups in the molecule, and which does not correspond to component (A) nor include component (A); component (C): an epoxy resin curing agent which does not have a urea structure in the molecule; and component (D): a dimethylurea compound represented by formula (a) (in formula (a), “R” is a hydrogen atom or an alkyl group having any number of 1 to 10 carbons).
摘要:
A radiation-resistant grease that is stable under elevated temperatures is disclosed. The grease is prepared by mixing a bentonite-based thickening agent with a base oil composed of m-(m-phenoxyphenoxy)diphenyl, pentaphenyl ether, a monoalkyltriphenyl ether or a monoalkyltetraphenyl ether (provided that the alkyl group contains 6-20 carbon atoms). To the mixture is added, if necessary, a gelling aid composed of an aliphatic alcohol, an aliphatic ketone and/or an aliphatic carbonate ester.
摘要:
A polymer composition is herein disclosed, which consists essentially of:(A) 90 to 50 wt % of a saturated polymer having in one molecule (1) at least two groups of at least one type selected from the group consisting of an epoxy group of the formula ##STR1## (R is hydrogen or methyl), an alcoholic or phenolic hydroxyl group and an alkoxymethyl-substituted acid amide group of the formula ##STR2## (R is an alkyl group of C.sub.1 to C.sub.4) and (2) a repeating unit made of a nonaromatic methylene group or methine group; and(B) 50 to 10 wt % of a nonfunctional radical polymerizable monomer mixture consisting of (a) a radical polymerizable monomer having in one molecule at least one functional group selected from the group consisting of a carboxyl group, an acid anhydride group, an alcoholic hydroxyl group, an alkoxymethyl-substituted acid amide group of the formula ##STR3## (R is an alkyl group of C.sub.1 to C.sub.4) and an amino group of the formula --NR.sub.1 R.sub.2 (R.sub.1 and R.sub.2 are each an alkyl group of C.sub.1 to C.sub.8) and an ethylenic double bond, and (b) a radical polymerizable monomer having one epoxy ring and one ethylenic double bond in one molecule.
摘要:
An emulsion composition for use in baking paint prepared by emulsion polymerization with ionizing radiation of a monomer mixture comprising (1) at least one acrylamide selected from the group consisting of N-methylolacrylamide and N-alkoxymethylacrylamide, (2) a radical polymerizable ethylenic unsaturated monomer having a hydroxyl group, and (3) a radical polymerizable ethylenic unsaturated monomer other than (1) and (2) above.
摘要:
A fire-retardant and radiation resistant molded resin product is prepared by blending a resin with a halogenated acenaphthylene compound of the formula: ##STR1## wherein X is chlorine or bromine and R is alkyl, alkoxy or alkylester of 1 to 4 carbon atoms such that when m is 0, n is an integer of 2 to 8; when m is an integer of 1 to 4, n is an integer of 2 to 7 and n+m is .ltoreq.8 and when m is more than 2, R may be the same or different; and, after molding said blend, generating free radicals within said blend.
摘要:
A method of manufacturing an electric wire or cable having an improved rubber or plastic insulation layer which has the maximum wall thickness of beam penetration of 4mm or over and whose properties are improved by irradiation with an electron beam, wherein the wire or cable runs under the scanner of an electron beam accelerator while being rotated about the axis of the wire or cable at such a speed as causes the same portion of the wire or cable to be irradiated with the electron beam at least twice during a period of less than 10 seconds; and the electron beam accelerator directs on the insulation layer of the wire or cable an electron beam which is accelerated to an energy of 1 MeV or over and whose maximum penetration range in the said insulation layer is larger than its thickness.