Plastic for low-smoke halogen-free high flame-retardant electric wire and cable

Abstract

The invention provides plastics for low smoke halogen-free highly fire-retardant wire cables. The raw material formula of the plastics in weight portion is as follows: 50 to 75 portions of polyolefine, 25 to 50 portions of maleic anhydride grafting olefinic copolymer and 60 to 70 portions of humidity resistance phosphorus-nitrogen system expanding type fire retardant material. In the invention, the fire retardant performance, the mechanical and physical performance and the product hardness are comprehensively considered in the whole formula, the tensile strength is more than and equal to 13.8MPa and the extension rate is more than and equal to 300 percent; when the plastics is used for the production of the wire cables, the wire cables can pass the VW-1 vertical wire flame test, and after the wire cables are subject to the aging in an air oven with the temperature of 180 DEG C for 168h, the retention rates of the tensile strength and the elongation at break of the wire cables are more than or equal to 80 percent; when the wire cables are dipped in water at the room temperature for 7 days, at the temperature of 20 DEG C, the volume resistivity is less than 10 times reduced, therefore, the plastics is a macro molecular hybrid material for the highly fire-retardant environment-friendly polyolefine wire cables, which is good in mechanical property.

Description

technical field [0001] The invention relates to plastics for electric wires and cables, in particular to a low-smoke, halogen-free and highly flame-retardant plastics for electric wires and cables. Background technique [0002] At present, the wave of green environmental protection is sweeping the world, and organizations represented by the European Union have adopted strict green environmental protection standards for household appliances. After the implementation of the "Restriction of the use of certain hazardous substances in electrical and electronic equipment" (RoHS) standard, there is a call for restrictions or even bans on wire and cable materials containing halogenated polymers. High, several well-known manufacturers of electrical appliances in the world also requested to cancel the use of halogen-containing polymers in electrical appliances in 2008, and use halogen-free flame-retardant polyolefin materials instead. [0003] According to the applicant's knowledge, ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a low-smoke, halogen-free, high-flame-retardant wire and cable plastic with good mechanical properties, and its purpose is to solve the problems of poor mechanical properties and poor water resistance existing in the existing low-smoke, halogen-free cable materials