Silane crosslinked halogen-free flame-retardant polyethylene cable material and preparation method thereof

Abstract

The invention provides a silane crosslinked halogen-free flame-retardant polyethylene cable material and a preparation method thereof. The preparation method comprises blending 45 to 65wt% of low density polyethylene, 5 to 10wt% of an ethylene-vinyl acetate copolymer, 2 to 5wt% of silane having the general formula of RSi(OR')3, 0.1 to 0.5wt% of a peroxide initiator, 0.01 to 0.1wt% of a crosslinking catalyst, 15 to 30wt% of modified nano-Mg(OH)2, 5 to 15wt% of ammonium polyphosphate and 0.5 to 1wt% of an antioxidant 1010 at a temperature of 150 to 160 DEG C, and carrying out granulation at the temperature of 150 to 160 DEG C to obtain a cable material. The preparation method has the advantages of easily available raw materials and simple processes. The silane crosslinked halogen-free flame-retardant polyethylene cable material has an oxygen index of 32.5 to 36, tensile strength of 12 to 15MP and the elongation at break of 415 to 450% and has characteristics of high tensile strength, elongation at break, anti-aging performance, good temperature resistance and no damage to the environment.

Description

technical field [0001] The invention belongs to the technical field of polyethylene cable material. Specifically relates to a silane crosslinked halogen-free flame-retardant polyethylene cable material and a preparation method thereof. Background technique [0002] The earth environment we live in is increasingly seriously polluted, which has endangered the quality of life and health of human beings. The traditionally used polyvinyl chloride (PVC) insulated wire and cable is a very serious source of pollution. Its main hazards are electrical fires and the production and disposal of harmful substances such as dioxins, halides, and heavy metals. Therefore, the current wire and cable industry has implemented halogen-free, low-smoke and flame-retardant wires and cables. Moreover, with the rapid development of my country's economy, the demand for wires and cables from all walks of life continues to increase, and at the same time higher requirements are placed on the various pro...

AI Technical Summary

Problems solved by technology

"Chemical Bulletin" (No. 1, 2006, page 18) reported that radiation crosslinking is the use of γ-rays (Co-60 source) or high-energy electron beams (electron accelerators) to irradiate polymers to generate polymer free radicals, which are combined with each other. Form cross-linking bonds to make linear polymer materials into a network structure. The disadvantages are high equipment cost, difficult safety protection and great damage to material properties; peroxide cross-linking uses organic peroxides as cross-linking agents , but due to the harsh control of temperature and pressure conditions, there are difficulties in industrial production; the silane crosslinking method has low equipment investment, low production cost, and high productivity. It is suitable for products of various shapes such as thick and thin, and at the same time Also suitable for filled composites and is therefore generally valued

Although the heat resistance of polyethylene has been greatly improved after silane crosslinking, the flame retardancy is still poor.