Low-smoke halogen-free and flame-retardant sheath material with high-temperature aging resistance and preparation method of sheath material

Abstract

The invention discloses a low-smoke halogen-free and flame-retardant sheath material with high-temperature aging resistance. The ethylene-propylene insulation material comprises components in parts by mass as follows: an ethylene-vinyl acetate copolymer EVA40L-03, an ethylene-vinyl acetate copolymer EVA2803, paraffin, vinyltri(beta-methoxy ethoxy) silane, 4.4-bis(2,2-dimethylbenzyl)diphenylamine, 2-mercapto benzimidazole, flame-retardant filler, zinc borate, antimonous oxide, montmorillonite, dicumyl peroxide and triallyl isocyanurate, wherein the content of VA in the ethylene-vinyl acetate copolymer EVA40L-03 is 40% and the content of VA in the ethylene-vinyl acetate copolymer EVA2803 is 28%. According to the low-smoke halogen-free and flame-retardant sheath material, the flexibility and the high-temperature aging resistance of the sheath material are improved, and the retention rate of elongation is higher than 60% after high-temperature aging is performed at the temperature of 180 DEG C for 240 h. Meanwhile, the invention provides a preparation method of the low-smoke halogen-free and flame-retardant sheath material with the high-temperature aging resistance.

Description

technical field [0001] The invention relates to the technical field of low-smoke, halogen-free, and flame-retardant sheathing materials, and relates to a high-temperature-resistant, aging-resistant, low-smoke, halogen-free, and flame-retardant sheathing material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy and the continuous strengthening of human awareness of environmental protection, green, low-carbon and environmentally friendly buildings have become the development trend of the construction industry. The buildings on the ground are getting higher and higher, the scale of underground facilities is getting bigger and bigger, and the wires and cables are getting bigger and bigger. The more widely it is used, the more intensive the laying is, and the more and more fires are caused by the damage or aging of the outer sheath of the cable. When the halogenated flame retardant materials are burned, a large amount...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of sheathing material is that the flame retardancy of ethylene-propylene rubber itself is very poor. To achieve high flame retardancy, a large amount of flame retardant must be filled, so that the processing technology and mechanical properties of the sheathing material are relatively poor, and the ethylene-propylene rubber When burning, the droplet phenomenon is very serious and it is difficult to form charcoal, and the sheath with serious droplet is made into bunches and it is difficult to pass the combustion test

[0004] The authorized publication number is CN103044759B, which discloses a kind of ethylene-vinyl acetate copolymer, linear low-density polyethylene and ethylene-butylene copolymer to prepare flame-retardant low-smoke halogen-free sheath material, but a single anti-halogen Oxygen agent tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, ester antioxidants have poor high temperature aging resistance, so this kind of sheathing material cannot be used in high temperature environment Use under

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