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

Abstract

The invention relates to a silane crosslinked halogen-free flame-retardant polyethylene cable material and a preparation method thereof. The technical scheme of the invention is as follows: 45 to 65 percent by weight of low-density polyethylene, 5 to 10 percent by weight of ethylene-vinylacetate copolymer, 2 to 5 percent by weight of silane with the general formula of RSi(OR')3, 0.1 to 0.5 percent by weight of peroxide initiator, 0.01 to 0.1 percent by weight of crosslinked catalyst, 15 to 30 percent by weight of modified nano Mg(OH)2, 5 to 15 percent by weight of ammonium polyphosphate and 0.5 to 1 percent by weight of antioxidant 1010 are mixed under the temperature of 150DEG C to 160DEG C, and after pelleting, the cable material is produced. The materials can be easily obtained, the technique is simple, the oxygen index of the prepared cable material is 32.5 to 36, the tensile strength is 12MP to 15MP, and the elongation at break is 415 to 450 percent. Consequently, the cable material is characterized by high tensile strength, high elongation at break, high anti-aging property and high temperature resistance, and cannot harm the environment when being discarded.

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.