Halogen-free flame-retardant insulated wire

A technology for insulated wires and insulating layers, which is applied in the direction of insulated cables, insulators, insulated conductors, etc., and can solve the problems of reduced flexibility of insulating coating films, lower initial tensile elongation of insulating coating films, etc.

Inactive Publication Date: 2015-07-29
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to satisfy the flame retardancy, a halogen-free flame retardant needs to be added in a larger amount than a halogen-based flame retardant, which may easily cause problems such as a decrease in the flexibility of the insulating coating film and The initial tensile elongation and the decrease in tensile elongation after heat aging

Method used

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  • Halogen-free flame-retardant insulated wire
  • Halogen-free flame-retardant insulated wire
  • Halogen-free flame-retardant insulated wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4 and comparative example 1 to 7

[0075] (Preparation of resin composition pellets)

[0076] The respective components for the outer and inner layers were mixed in the compositions shown in Tables I and II. The components were melt-mixed by using a twin-screw mixer (45 mmφ, L / D=42) at a cylinder temperature of 240° C. and a screw rotation number of 200 rpm. Each resulting mixture was melt extruded into strands. Subsequently, the molten strands were cooled and cut to prepare pellets.

[0077] (Preparation of insulated wire)

[0078] Using a single-screw extruder (30mmφ, L / D=24), the resin for the inner layer was extruded to a cross-sectional area of ​​0.35mm in such a manner that the wall thicknesses shown in Table I and Table II were obtained. 2 Conductor (comprising 19 twisted wires of annealed copper wires, each copper wire having a diameter of 0.16mmφ) to form an inner layer. After cooling, the outer layer was formed by extruding the resin for the outer layer over the inner layer using the same single s...

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Abstract

Provided is a halogen-free flame-retardant insulated wire which has high hot water resistance, while achieving a good balance among insulation resistance, flame retardancy, wear resistance and thermal deformation resistance at high levels. A halogen-free flame-retardant insulated wire which comprises a conductor and a halogen-free insulating layer that covers the conductor. The insulating layer has: an outer layer that is formed of a crosslinked body of a resin composition which contains 100 parts by mass in total of resin components, wherein 25-30 parts by mass of a polyphenylene ether resin and 10-30 parts by mass of a styrene elastomer are finely dispersed in 40-65 parts by mass of a high-density polyethylene having a melt flow rate of 0.60 or less, and 5-50% by mass of a metal phosphinate, 6-25% by mass of a phosphoric acid ester and 1-10% by mass of a polyfunctional monomer relative to the resin components; and an inner layer that is formed of a crosslinked polyethylene. The thickness of the inner layer is 10-85% of the total thickness of the inner layer and the outer layer.

Description

technical field [0001] The present invention relates to a halogen-free flame-retardant insulated wire, which includes a halogen-free insulating coating layer, and in the insulating coating layer, insulation resistance, flame retardancy, abrasion resistance, hot water resistance, heat deformation resistance, etc. are highly On balance, the halogen-free flame-retardant insulated wire is suitable for use in, for example, wiring harnesses of automobiles or railway vehicles. Background technique [0002] Insulated wires used, for example, as harness wires for automobiles or rail vehicles may be exposed to adverse conditions such as temperature changes from cold to high temperatures, shock, and wind and rain, and possibly to heat or fire generated by the device Wait. Therefore, the insulating coating of such an insulated wire needs to satisfy predetermined standards regarding mechanical strength, insulation resistance, hot water resistance (stability), flame retardancy, abrasion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/295C08K5/521C08K5/5313C08L23/06C08L25/04C08L71/12H01B3/44H01B7/02
CPCH01B3/441H01B3/28H01B3/44H01B3/442H01B3/427H01B7/295C08L71/12C08L23/06C08K5/5313C08L25/04C08K5/521C08L23/08C08L53/025
Inventor 藤田太郎早味宏西川信也越智祐司堀贤治
Owner SUMITOMO ELECTRIC IND LTD
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