Halogen-free flame-retardant polymer composition, insulated electric wire, and cable

Abstract

A halogen free flame-retardant polymer composition includes flame retardancy and excellent oil resistance / fuel resistance, low-temperature characteristics, and injury resistance, and an insulated electric wire and a cable include the composition. The halogen-free flame-retardant polymer composition includes a base polymer including 60 to 70% by mass of LLDPE, 10% by mass or more of EVA having a melt flow rate (MFR) of 100 or more, and 10 to 20% by mass of maleic acid-modified polyolefin, a metal hydroxide added at a ratio of 150 to 220 parts by mass relative to 100 parts by mass of the base polymer, and carbon black. The addition ratio (metal hydroxide / carbon black) between the metal hydroxide and the carbon black is 15:1 to 100:1.

Description

technical field [0001] The present invention relates to a halogen-free flame-retardant resin composition, insulated wire and cable. In more detail, it relates to a halogen-free flame-retardant resin excellent in flame retardancy, low toxic gas properties during combustion, oil resistance and fuel resistance, and low-temperature characteristics, which are used in railway vehicles, automobiles, electric and electronic equipment, etc. Composition, insulated wire and cable. Background technique [0002] As materials for insulating wires and cables used in railway vehicles, automobiles, electrical and electronic equipment, etc., polyvinyl chloride ( PVC) mixture, chloroprene rubber mixture, chlorosulfonated polyethylene mixture, chlorinated polyethylene mixture, fluororubber, fluororesin, polyethylene and other polyolefin resins are obtained by adding a halogen flame retardant to improve flame retardancy s material. However, these substances containing a large amount of haloge...

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Problems solved by technology

[0009] However, if the side chain of the polymer has a structure that generates non-combustible gas, the polarity of the polymer will be increased and the low-temperature characteristics will be deteriorated.

In addition, adding a functional group to the side chain hinders the crystallization of the polymer and makes it a soft material. Therefore, in the case of particularly thin insulated wires and cables, there is a possibility of short circuit due to external damage.

In addition, when adding a halogen-free flame retardant, it needs to be added in a large amount, and there is a problem that the mechanical properties at room temperature are greatly reduced, not to mention low temperature.

[0010] Oil resistance and fuel resistance can be improved by increasing the crystallinity of the polymer or increasing the polarity of the polymer. However, when a large amount of flame retardant is added to the material of the polymer crystallinity, the mechanical properties will be significantly deteriorated. Poor flammability and high polarity polymers have the disadvantages of low temperature characteristics and poor trauma resistance as mentioned above

[0011] In Patent Document 3, an ethylene-vinyl acetate copolymer with high polymer polarity is proposed as a base polymer, and an insulated wire having high flame retardancy and improved low-temperature characteristics and trauma resistance, which are disadvantages, is proposed. Unsatisfactory under severe conditions (EN50306) required for vehicle use, insufficient low temperature characteristics and trauma resistance

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