Halogen-free flame-retardant composite material and preparation method thereof

Abstract

The invention relates to a halogen-free flame-retardant composite material. The halogen-free flame-retardant composite material is prepared from, by weight, 65-85 parts of HDPE, 30-50 parts of EVA resin, 1-10 parts of polyethylene glycol, 3-8 parts of dicumyl peroxide, 1-5 parts of polypyrrole nanowires and 50-80 parts of modified flame retardant. The composite material is better in toughness and more durable, is an environment-friendly material which is good in flame retardant property and excellent in comprehensive mechanical property and is reasonable in composition, simple and convenient in implementation method and easy to implement, involved raw materials are all easy to obtain and process, and the composite material is suitable for industrial mass production.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a halogen-free flame-retardant composite material and a preparation method thereof. Background technique [0002] Ethylene-vinyl acetate copolymer (EVA) itself is a relatively flammable polymer material, and its limiting oxygen index is only 17.0-19.0%. With the increase of vinyl acetate content, the limiting oxygen index increases, but the char formation rate is low. Melt droplets are produced during combustion, so flame retardant modification is required in many applications. At present, additive flame retardants are mainly used in the flame retardant treatment of ethylene-vinyl acetate at home and abroad. According to "Advanced Polymer Processing Technology" (Polymers for Advanced Technologies, 2011, 22:379-394), among the halogen-free additive flame retardants that have been used and can be used for flame retardant ethylene-vinyl acetate, hydroxide flame retardan...

AI Technical Summary

Problems solved by technology

This compound is used to prepare EMC halogen-free composite materials, which has excellent flame retardant performance, high char formation rate, low toxicity, low corrosion and simple preparation method; however, this type of flame retardant is similar to traditional inorganic and organic flame retardant systems , adding to EVA plastic polymers is easy to deteriorate the mechanical properties of its composite materials, and its compatibility is poor, the melting range is wide, the purity is low, and the melting point is high, and its processing performance is poor when used in plastic polymers (such as EVA, PP).

At present, in order to overcome this problem in the industry, the processing and mechanical properties of plastic polymer materials are often improved by reducing the amount of phosphazene flame retardants added. At the same time, the flame retardant effect will be reduced.

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