Expansive type halogen-free flame-retardant ethylene propylene diene monomer material

Abstract

The invention discloses an expansive type halogen-free flame-retardant ethylene propylene diene monomer material. The material is prepared and processed from the following raw materials in parts by weight: 50-70 parts of ethylene propylene diene monomers, 30-50 parts of a surface-modified expansive type halogen-free flame retardant, 1-5 parts of a smoke suppressant, 1-3 parts of a processing aid and 2-5 parts of a vulcanizing aid, wherein the surface-modified expansive type halogen-free flame retardant is prepared from polyphenylphosphonate piperazine, phenyl phosphinate, melamine cyanurate or melamine polyphosphate through compounding. After the compound halogen-free flame retardant is subjected to wet process modification by virtue of a polysiloxane compounded titanate surface modifying agent, the water tolerance and consistency are obviously improved, the compound material has excellent flame retardance, water tolerance and physical and electric properties, the oxygen index reaches 43% or above, and the compound material reaches (1.6mm) V-0 level, can be widely applied to the fields of new energy automobile parts, electric wires and cables, electronic devices and equipment and the like and has good application prospects.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to an intumescent halogen-free flame-retardant EPDM rubber material. Background technique [0002] Ethylene-propylene-diene rubber (EPDM) is an important synthetic rubber. Its consumption is second only to styrene-butadiene rubber and butadiene rubber, and it has become the third largest synthetic rubber in the world. It has excellent heat resistance, aging resistance and water resistance. And excellent insulation properties, widely used in automobiles, home appliances, cables, construction and other industries. The main components of EPDM are ethylene, propylene and a small amount of third monomers, and the limiting oxygen index is only about 19%. In many cases, it is difficult to meet the flame retardant requirements, so EPDM must be modified to meet the flame retardant requirements in most application fields. [0003] The additive flame retardant EPDM material has the advantage...

AI Technical Summary

Problems solved by technology

At present, phosphorus-nitrogen intumescent halogen-free flame retardants generally have poor water resistance and easy moisture absorption. They must be strictly matched with acid sources, carbon sources, and gas sources. There are fewer intumescent halogen-free flame retardants that meet the application conditions of EPDM.

Chinese invention patent CN102675754A discloses a "halogen-free flame-retardant EPDM material and its preparation method". The composition is prepared by adding a single component of metal hypophosphite as a flame retardant and adding inorganic particles. The flame retardant system is not compounded with other synergists, the flame retardant efficiency is low, and the prepared flame retardant EPDM has a low oxygen index of only 25%; Chinese invention patent CN104693580A discloses "a halogen-free flame retardant masterbatch for EPDM rubber and its preparation method", the masterbatch uses PE and EVA as carrier resins, and uses microencapsulated red phosphorus, microencapsulated ammonium polyphosphate compounded with pentaerythritol phosphate, pentaerythritol, piperazine pyrophosphate and other char-forming agents to flame-retardant EPDM

Because charcoal agents containing a large amount of hydroxyl groups such as microencapsulated ammonium polyphosphate compound pentaerythritol have greater water solubility and hygroscopicity, poor compatibility, and are easy to precipitate, which will seriously affect the electrochemical performance of the material.

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