Modified graphene reinforced epdm composites and methods of making

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By preparing flame-retardant modified graphene and grafting polyvinyl acetate molecular chains onto the graphene surface, and combining ethylene-vinyl acetate copolymer as a compatibilizer, the compatibility and flame retardancy issues between graphene and EPDM rubber were solved, significantly improving the mechanical properties and flame retardant effect of the material.

CN118852797BActive Publication Date: 2026-05-05ZHUZHOU TAIXIN ELECTRONIC TECH CO LTD

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Patent Information

Application Number: CN202410923529.4
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2024-07-10
Publication Date: 2026-05-05
Estimated Expiration: 2044-07-10

Application Information

Patent Timeline

10 Jul 2024

Application

CN202410923529.4

05 May 2026

Publication

CN118852797B

IPC: C08L23/16; C08L23/0853; C08L51/10; C08F292/00; C08F230/02; C07F9/12

CPC: C08L23/16; C08F292/00; C07F9/12; C08L2201/02; C08L23/0853; C08L51/10; C08F230/02

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Application Domain

Group 5/15 element organic compounds

Technology Topics

Polymer science Phosphoric acid

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AI Technical Summary

Technical Problem

Graphene has poor compatibility with EPDM rubber, and EPDM rubber has poor flame retardancy.

Method used

By preparing flame-retardant modified graphene, a graft polymerization reaction was carried out between vinyl acetate flame retardant and KH570 modified graphene to graft polyvinyl acetate molecular chains onto the graphene surface. Ethylene-vinyl acetate copolymer was added as a compatibilizer to enhance the compatibility between graphene and EPDM rubber and improve dispersibility.

Benefits of technology

The modified graphene-reinforced EPDM rubber composite material exhibits significantly improved Shore A hardness, tensile properties, and tear strength, as well as enhanced flame retardancy and a higher limiting oxygen index.

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Abstract

This invention relates to the field of EPDM rubber technology, and discloses a modified graphene-reinforced EPDM rubber composite material and its preparation method, comprising 100 parts by weight of EPDM rubber, 1-1.4 parts by weight of antioxidant, 2-3 parts by weight of sulfur, 1-1.5 parts by weight of accelerator, 0.5-5 parts by weight of flame-retardant modified graphene, and 0.15-2 parts by weight of compatibilizer ethylene-vinyl acetate copolymer. The ethylene-vinyl acetate copolymer of this invention can act as a compatibilizer, enhancing the compatibility between the flame-retardant modified graphene and EPDM rubber, allowing graphene to play a better reinforcing role and significantly improving the material's hardness and other mechanical properties. The flame-retardant modified graphene contains a large number of diphenyl bisphosphate flame-retardant groups, acting as a phosphorus-containing flame retardant, giving the composite material better flame-retardant properties and exhibiting a higher limiting oxygen index.

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