Halogen-free flame-retardant masterbatch for ethylene-propylene-diene monomer and preparation method of halogen-free flame-retardant masterbatch

Abstract

The invention relates to a halogen-free flame-retardant masterbatch. The raw material formula of the halogen-free flame-retardant masterbatch comprises the following components in percentage by weight: 5 to 20% of carrier resin, 75 to 90% of compounding flame retardant, and free antioxidants, lubricants and surface modification agents, wherein the carrier resin is LDPE (Low-Density Polyethylene) or EVA (Ethyleno Vinyl Acetale Copolymetr) or the mixture of LDPE and EVA; the compounding flame retardant comprises a fire retardant, a charring agent, a smoke inhibitor and a synergist; the fire retardant is one or the combination of some of micro-capisulazed red phosphorus, micro-capisulazed ammonium polyphosphate, a melamine-phosphate compound and melamine cyanurate. The masterbatch has the advantages of being smooth in appearance, high in flame retardant content, and free of slag falling; the problem of large dust caused by adding common fire retardant in the ethylene-propylene-diene monomer melting process can be solved, thus the melting efficiency can be increased, the productivity can be improved, and moreover, the vulcanization of ethylene-propylene-diene monomer is not influenced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a halogen-free flame-retardant masterbatch for EPDM rubber and a preparation method thereof. Background technique [0002] Ethylene Propylene Diene Monomer (EPDM) has good heat resistance and ozone resistance, and is widely used in the production of rubber products used in static conditions such as automotive heat-resistant rubber parts, seals, and waterproof membranes. EPDM is a non-self-reinforcing rubber, and the EPDM materials usually used are products reinforced by adding reinforcing agents such as carbon black, which have good comprehensive performance, and inert fillers such as carbon black are also used in EPDM. It can reduce the cost and improve the performance of the processing technology. [0003] The oxygen index of pure rubber is only about 19%, and the flame retardant performance of EPDM reinforced with carbon black is not good. In many cases,...

AI Technical Summary

Problems solved by technology

Aluminum hydroxide and magnesium hydroxide metal hydroxide flame retardants have good smoke suppression effect, but the flame retardant efficiency is extremely low, usually 50% (weight) or more must be added to reach the flame retardant level

Moreover, the processing technology of rubber is usually vulcanized after kneading. Adding powdered flame retardant directly during the kneading process will cause too much dust, and the problem of low adding efficiency cannot be avoided.

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