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Cable

A technology for cables and mass parts, applied in the direction of cables, insulated cables, circuits, etc., can solve the problems of no improvement, and achieve the effects of excellent oil resistance, low temperature characteristics, and high flame retardancy

Active Publication Date: 2020-05-19
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The halogen-free insulated wire involved has the expected flame retardancy, excellent low-temperature characteristics, and oil resistance, but it cannot be said that there is no room for improvement

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0056] (1) Preparation of insulated wire

[0057] First, prepare a conductor obtained by twisting and tinning 19 0.18mm single wires.

[0058] In 100 parts by weight of polybutylene terephthalate (manufactured by Mitsubishi Engineering Plastics Co., Ltd., Novaduran 5026), 30 parts by weight of magnesium hydroxide (manufactured by Kyowa Chemical Industry Co., Ltd., Kisuma 5L) was added as a flame retardant, Kneading was carried out using a twin-screw extruder with a screw diameter of 30 mm and L / D=40, and pelletized by a pelletizer to prepare a material for the flame-retardant layer.

[0059] In the material of the electrical insulating layer, linear low-density polyethylene (manufactured by Primeman Polymer Co., Ltd., Evolue SP1510) was used, and 2-layer extrusion was performed by a 40 mm extruder to coat so that the thickness of the electrical insulating layer was 0.1 mm, flame retardant layer thickness is 0.16mm. Electron beam irradiation was performed on the obtained insu...

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Abstract

The present invention provides a cable having high flame retardancy, excellent oil resistance, and excellent low-temperature characteristics. The cable is provided with a sheath layer on the peripheryof a multi-core stranded wire. The multi-core stranded wire is obtained by stranding a plurality of insulated wires, each of which has an insulating layer formed on the outer periphery of a conductor. The sheath layer is a crosslinked product formed from a halogen-free flame-retardant resin composition. The halogen-free flame-retardant resin composition contains 170-260 parts by mass of a metal hydroxide per 100 parts by mass of the base polymer. The base polymer contains (a) a polyolefin resin that contains an ethylene-vinyl acetate copolymer and is not acid-modified, and (b) an acid-modified polyolefin resin, wherein (a):(b)=95:5-60:40, the vinyl acetate content of the base polymer is 5-40% by mass, the metal hydroxide is composed of aluminum hydroxide and magnesium hydroxide, and the aluminum hydroxide content is higher than the magnesium hydroxide content.

Description

technical field [0001] The present invention relates to cables with high flame retardancy, excellent oil resistance and low temperature properties. Background technique [0002] In Europe, where the railway vehicle network is well developed, regionally unified standards called EN Standards (European Standards) are widely used. The relevant standards require the use of halogen-free materials with high flame retardancy and oil resistance for electric wires and cables used in railway vehicles, since there is a risk of serious accidents due to their defects. [0003] In response to such a demand, the present applicant has previously provided an electric wire for railway vehicles (for example, refer to Patent Document 1), which has a conductor and a non-halogen cross-linked resin composition formed on the outer peripheral side of the conductor. In the insulating layer, the halogen-free cross-linked resin composition contains 80 to 200 parts by mass of metal hydroxide relative to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/17H01B7/28H01B7/295C08L23/08C08L23/00C08L23/26C08K3/22H01B3/44
CPCH01B7/17H01B7/28H01B7/295C08L23/0853C08L23/00H01B3/44H01B3/441C08L2201/02C08L2203/202C08K2003/2227C08K2003/2224C08L23/26C08K3/22
Inventor 岩崎周木部有桥本充
Owner HITACHI METALS LTD