Preparation process for highly-flame-retardant, irradiation-crosslinked, low-fume and low-halogen polyolefin material

Abstract

The invention provides a preparation process for a highly-flame-retardant, irradiation-crosslinked, low-fume and low-halogen polyolefin material. The preparation process comprises the following steps:subjecting EEA, PE, POP and a compatibilizing agent to premixing and modifying, and carrying out granulating for subsequent usage; adding hydromagnesite powder into a surfactant, carrying out mixing,and subjecting mixed particles, powder, a halogen-based flame retardant, antimonous oxide, zinc borate, a lubricant, an antioxidant and a crosslinking agent to mixing at a high speed; subjecting a mixed semi-finished product to high-temperature melting in a formula proportion, after the material is completely molten into a material lump, carrying out further mixing and dispersing, then carrying out discharging, and subjecting a remixed material to granulating; after completion of molding and granulating, allowing the material to pass through a honeycomb plate located at the front end of a single screw, and carrying out granulating; and after the material is granulated, carrying out cooling and sieving through a pipeline, selecting particles with a length of 3 to 5 mm as qualified products, and carrying out packaging. According to the invention, through combination of a plurality of flame retardants, excellent flame retardancy is achieved; meanwhile, compared with a PVC material, the material provided by the invention is greatly reduced in the amount of fuming, and has the advantages of low fume density and excellent and stable physical properties.

Description

technical field [0001] The invention relates to the field of flame retardant materials, in particular to a preparation process of high flame retardant irradiation crosslinked low-smoke and low-halogen polyolefin materials. Background technique [0002] Irradiation cross-linked low-smoke and low-halogen flame-retardant polyolefin cable material is an environmentally friendly flame-retardant material added with hydroxide and a small amount of environmentally friendly halogen-based flame retardants. It absorbs heat by dehydration and isolates carbon to achieve flame retardancy effect. Irradiation cross-linked low-smoke, low-halogen flame-retardant polyolefin cable material, the mechanical properties meet the requirements of XLPE outer coating materials in the standards of electronic wires and automobile wires, and the flame retardancy has passed the UL1581VW-1 grade. There are different requirements in different industries and different geographical locations, and some have ve...

AI Technical Summary

Problems solved by technology

[0003] General radiation cross-linked low-smoke low-halogen flame-retardant polyolefin cable materials do not have high requirements for flame retardancy, the proportion of polyolefin resin is high, and the flame-retardant system is relatively small to ensure mechanical and physical properties, but it limits the flame-retardant performance. After being made into a cable, it can only reach the horizontal burning level, or occasionally reach the single vertical burning level but it is unstable, and the requirements for high flame-retardant materials cannot be met.