JPS6032281B2 - Crosslinked polyolefin insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crosslinked polyolefin insulated wire that is flame retardant and has excellent heat resistance.

Recently, flame retardant requirements for audio equipment such as TV sets and radios have become stricter from the standpoint of fire and disaster prevention, and the same applies to the electric wires used in these equipment.

Especially UL (Unde skin writers)
It has become necessary to meet very strict standards for flame retardancy and heat resistance, such as the (abbreviation for lnc) standard. It is already well known that polyolefin resins can be crosslinked by radiation irradiation (for example, electron beams) to improve their mechanical strength, heat deformation resistance, and the like. In addition, since polyolefin resin is a flammable material, flame retardants,
Elutriation combustion aids (e.g. SQ03), fillers (e.g.
)3) etc. are added to impart flammability. Therefore,
The properties of the material are greatly influenced by the flame retardant used. Therefore, in order to make a material that satisfies the strict flame retardancy and heat resistance of UL standards, it is necessary to use 2.2-di(4-bromoethoxy-3.5-dibromophenyl)propane (Br: 61%, hereinafter referred to as ``B''). Although it has a fire-fighting effect, it lacks thermal stability, so it is not possible to use a fire-fighting agent that does not have very good heat resistance.
PCD) and decabromodiphenyl oxide (B
A flame retardant with excellent thermal stability such as DBDPO (r: 80%, hereinafter referred to as DBDPO) must be used. However, we have found that the heat resistance is not as good as that of PCPCD and DBDPO. B. It was discovered that by using PCPCD or DBDPO in combination with PCPCD or DBDPO, the heat resistance was significantly improved compared to when PCPCD or DBDPO was used alone. As a result of further detailed consideration, we found that B. Amount of halogen inside/P
It was discovered that it is necessary for the amount of halogen in CPCD, HPCPCD or DBDPO to be 1/30 or more and 1/4 or less, preferably 1/9 to 1/10, and coated with this material. The present invention was completed by manufacturing electric wires and confirming that they passed UL standards. Example A compound having the composition shown in Table 1 was prepared, and the outer diameter was 0.
After coating a steel conductor with 813 ribs to a thickness of 0.8, it was cross-linked by irradiating three separate centers with an electron beam, and was subjected to a vertical combustion test (FR-1) and a heat aging test according to the UL standard.

Table 1 Formula *EEA ethylene ethyl acrylate copolymer**E
VA ethylene-vinyl acetate copolymer***HPCPCD
Product name: Dechlorane Plus (CI: 65%) ※＊＊＊＊Halogen ratio is day. Halogen amount of B and DBDPO or HP
The ratio to the amount of halogen in CPCD is shown.

G Heat aging performance UL standard: Tensile strength residual rate 70%, elongation: 6
Table 2 shows the results of the combustion test (FR-1) and heat aging test.

As a result, although Comparative Examples 1, 2, and 3 passed the combustion test, they did not pass the heat aging performance standard. However, day... B
．． In Examples A, B, C, and D of the present invention using 1DBDP○, HB, and 1 day PCPCD brood fuel systems, combustion tests,
A cross-linked Hinano polyolefin electric wire was obtained that met the UL standards in both heat aging tests. The above Examples A, B, C, and D are from Japan.
The sum of B and DBDPO or HPCPCD is EEA or E
It is added in an amount of 40 to 52 parts by weight based on the weight of VAIOO. Halogen amount of B and DBDPO or HP
This uses a composition in which the ratio of halogen to CPCD is 1/26 to 1/4, and products using such a composition have passed various tests on UL parent as shown in Table 2. I can see that you are fully satisfied.

See you next day. As can be seen from Comparative Examples 1, 2, and 3, those to which B, DBDP◯, and HPCPCD were added alone had poor heat aging performance and did not pass the UL standard test.

Claims (1)

[Scope of Claims] 1. At least one of perchloropentacyclodecane or its derivatives, decabromodiphenyl oxide, and 2,2-di(4-bromoethoxy-3,5-dibromophenyl)propane are added to a polyolefin resin. , so that the total amount is 35 to 55 parts by weight based on 100 parts by weight of the polyolefin resin, and the amount of halogen in 2,2-di(4-bromoethoxy-3,5-dibromophenyl)propane and park The ratio to the amount of halogen in at least one of lorpentacyclodecane or its derivatives and decabromodiphenyl oxide is 1/30 or more and 1/4 or less, and flame retardant aids, fillers, etc. are added. 1. A crosslinked polyolefin insulated wire, characterized in that a composition comprising: is provided on a conductor and irradiated with an electron beam. 2. The crosslinked polyolefin insulated wire according to claim 1, wherein the polyolefin resin is at least one of polyethylene, ethylene-vinyl acetate copolymer, and ethylene-acrylate copolymer.