Irradiation cross-linked halogen-free flame retardant material and its application without blistering on the tube wall when it is heated and shrunk

Abstract

The invention discloses an irradiating crosslinking halogen-free flame-retardant material with a non-foaming pipe wall in heating shrinkage. The irradiating crosslinking halogen-free flame-retardant material comprises the following raw materials in parts by weight: 10-100 parts of ethylene-vinyl acetate copolymer, 0.5-10 parts of organosilicon polymer, 0.1-10 parts of antioxidant, 0.1-50 parts of coated red phosphorus flame retardant, 1-150 parts of aluminium hydroxide and / or magnesium hydrate and / or modified aluminium hydroxide and / or modified magnesium hydrate, 0-50 parts of high molecular weight ammonium polyphosphate (APP) and / or 0-50 parts of phosphate flame retardant and / or 0-50 parts of melamine cyanurate (MCA) and / or 0-50 parts of phosphinates, 0.1-100 parts of carbonate and / or phosphate and / or phosphide and / or calcined clay and / or kaoline and / or clay. The irradiating crosslinking halogen-free flame-retardant material can be applied to a heating shrinkage sleeve and the like, the flame retardant grade achieves the American UL224VW-1 standard, and no halogen is contained.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant environment-friendly material and its application, in particular to a radiation-crosslinked halogen-free flame-retardant material with no foaming on the tube wall when heated and shrunk and its application. Background technique [0002] As early as the 1970s, various flame-retardant materials have been developed at home and abroad, but most of these flame-retardant materials contain halogens. Although they have a certain flame-retardant effect, when a fire occurs, the burning halogen-containing High-quality flame-retardant materials will produce toxic gases and smog, which not only affects the smooth progress of disaster relief work, but also causes "secondary disasters" to life and property. [0003] A small number of halogen-free flame retardant materials use red phosphorus flame retardants. Red phosphorus flame retardants are shared with organic phosphorus nitrogen flame retardants, aluminum hy...

AI Technical Summary

Problems solved by technology

However, the dehydration temperature of aluminum hydroxide is about 300°C, and the decomposition temperature of magnesium hydroxide is 340-490°C when heated. When the shrinkage temperature during heat shrinkage is higher than the decomposition temperature of aluminum hydroxide or magnesium hydroxide, it is very easy to generate gas due to the decomposition of the flame retardant, and the gas generated by the decomposition of the flame retardant cannot be discharged inside the insulating material. The final result is When the insulating material is heated, especially when it is heat-shrinked at high temperature, the pipe wall of the insulating material foams and expands, and it is seriously honeycombed, losing its insulating protection performance