Flame-retardant functional rubber and preparation method thereof

Abstract

The invention relates to rubber and a preparation method, in particular to a flame-retardant functional rubber and a preparation method thereof. Benzoic acid functionalized graphene with numerous carboxyl groups is prepared by combining together aminobenzoic acid and graphene through diazo-reaction under the condition of sodium nitrite and hydrochloric acid serving as catalysts from the prospective of modular design; under the action of N',N-dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) used as catalysts, the surface activated carboxyl groups of the benzoic acid functionalized graphene are bonded to hydroxyl groups of epoxidized natural rubber through esterification so that a flame retardant and natural rubber substrate are chemically bonded; the preparation method enables molecular mixing of the rubber substrate and flame retardant in a composite; the flame retardant and nano-enhancer dispersion problem and interfacial problem among rubber substrates are substantially solved at the same time.

Description

technical field [0001] The invention relates to a rubber and a preparation method thereof, in particular to a flame-retardant functional rubber and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, flame retardants are the second largest additives after plasticizers, and are widely used in electronics, furniture fabrics, building materials, vehicles and other fields. It silently builds a firewall for us to prevent or slow down the occurrence or spread of fire. Halogen flame retardants are the first flame retardants to be discovered, and their flame retardant principle is mainly to use halogen elements to generate a large amount of incombustible gas after combustion to prevent further combustion of materials. Intumescent flame retardants are a class of environmentally friendly flame retardants that are developing extremely fast. The intumescent flame retardant uses phosphorus and nitrogen as the main flame reta...

AI Technical Summary

Problems solved by technology

Due to the large difference in surface energy and poor interfacial compatibility between them, a large number of defects and voids are formed during rubber mixing, resulting in a limited increase in the flame retardant efficiency of the rubber system and a significant decline in mechanical properties.

At the same time, due to the fact that traditional intumescent flame retardants are easy to agglomerate in the material matrix and have poor compatibility with the material matrix, it will lead to uneven dispersion of the flame retardant in the material matrix, easy migration to the surface of the matrix, and poor thermal stability.

This greatly affects the mechanical properties of the material

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