Halogen-free flame retarding polymer sheet material

Abstract

The invention discloses a halogen-free fire-retardant polymer sheet and pertains to the field of insulation material. The halogen-free fire-retardant polymer sheet is characterized by mainly being prepared by the following components according to the weight portions: 100 portions of polypropylene, 10 portions to 80 portions of halogen-free polypropylene fire retardant, 20 portions to 100 portions of halogen-free fire-retardant polyester and 5 portions to 40 portions of compatilizer, wherein, the compatilizer refers to as functionalized macromolecule capable of realizing compatibilization effect between the polypropylene and the halogen-free fire-retardant polyester. The method disperses one or more halogen-free polyesters with lower combustibility into thin halogen-free fire-retardant polypropylene sheet by a melt blending method, solves the technological difficulty that the existing halogen-free fire-retardant system is very hard to lead thin polypropylene sheet to reach a higher fire-retardant degree at the mentioned thickness. The fire-retardant polypropylene sheet has the properties of environmental protection, high fire-retardancy and high heat resistance, and is mainly used for insulation in live components in the electrical and electronic industries.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant polymer sheet, more specifically, the invention relates to a polypropylene-based gasket material with environmental protection, high flame retardancy and high heat resistance, which belongs to an insulating material . Background technique [0002] Calendering flame-retardant polypropylene into a sheet between 0.125mm and 0.75mm has the advantages of flame retardancy, pressure resistance, temperature resistance, tear resistance and bending resistance, and has been widely used as a spacer insulation material for live parts in electrical and electronic products. . Today, the most widely used in the world market is the flame-retardant FORMEX of ITW Company of the United States. TM 、FORMEX TM GK and STATEX TM A series of flame-retardant polypropylene insulating gaskets, ITW company patent US 5521003 discloses flame-retardant polypropylene sheets prepared from homopolypropylene, copolymerized polyp...

AI Technical Summary

Problems solved by technology

Hydroxide flame retardants are represented by magnesium hydroxide and aluminum hydroxide, but even if the addition amount is more than 60wt%, it is difficult to make polypropylene reach the UL94 V0 flame retardant level required by the 0.125mm-0.75mm insulating sheet, which leads to Flame-retardant polypropylene is difficult to process, and the tear resistance and bending resistance are seriously reduced

Phosphorus-based flame retardants are represented by red phosphorus and organic phosphates. The addition amount is lower than that of hydroxide, and a large amount of addition is required to achieve a high flame-retardant grade. Because of the large amount of flame retardants, the water absorption rate of the product is large and High exudation rate, which reduces the insulation level and application range of polypropylene sheets

Nitrogen-based flame retardants are represented by melamines and triazines, and often no matter how much they are added, they cannot achieve high flame-retardant grades under the customary thickness of polypropylene insulating sheets of 0.125mm to 0.75mm.

Nitrogen-phosphorus compound flame retardant, Chinese patent CN 200410052598.5 discloses the preparation of thermally conductive insulating gaskets by blending homopolypropylene, copolymerized polypropylene, phosphate ester, melamine and thermally conductive fillers, and there is also the addition of flame retardants. The problem of degradation of mechanical properties and insulation properties

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