Halogen-free flame retardant dynamically vulcanized EPDM/PP thermoplastic elastomer and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant dynamically vulcanized EPDM / PP thermoplastic elastomer and a preparation method thereof. The EPDM / PP thermoplastic elastomer is prepared from, by mass, 100 parts of EPDM, 40-80 parts of polypropylene, 1-3 parts of crosslinking agent, 1-3 parts of auxiliary crosslinking agent, 44-78 parts of composite halogen-free flame retardant agent, 0.5-1 part of silane coupling agent, 1-2 parts of lubricant, and 1-2 parts of anti-oxidant. The preparation method comprises the steps of firstly mixing uniformly the composite halogen-free flame retardant agent and the silane coupling agent, adding EPDM, PP and lubricant, alloying, plasticizing the mixture, extruding, granulating, and finally adding the crosslinking agent, auxiliary crosslinking agent and the anti-oxidant, alloying, plasticizing, extruding the mixture and granulating. The EPDM / PP thermoplastic elastomer not only has a good flame retardant property which can attain the flame retardant level of UL94-V0, but also has an excellent mechanical property, anti-aging property and hydrolysis resistance. The halogen-free flame retardant dynamically vulcanized EPDM / PP thermoplastic elastomer has the advantages of being simple in preparation process, low in production cost, and easy for industrialized production.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant dynamically vulcanized EPDM / PP thermoplastic elastomer and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] Dynamically vulcanized EPDM / PP thermoplastic elastomer is a material that combines the elasticity of EPDM and the melt fluidity of PP, and can be reused. EPDM and PP will undergo in-situ cross-linking during melt blending. At the same time, under the high-speed shear stress of the mixing machine, the cross-linked EPDM is sheared into tiny particles (also called micro-regions) and dispersed in PP. This cross-linked rubber domain mainly imparts elasticity to the blend, while PP provides thermoplastic flow at the melting temperature. Dynamically vulcanized EPDM / PP thermoplastic elastomer has excellent physical and mechanical properties, electrical insulation properties and processing properties, and is widely used in many fiel...

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Problems solved by technology

The Chinese patent with the application number 200310106228.0 discloses a dynamic vulcanized flame-retardant EPDM / PP elastomer. The thermoplastic elastomer is added with a bromine-containing flame retardant. Although the oxygen index can reach up to 32, it is not friendly to the environment and cannot meet the requirements. RoHS and WEEK requirements; Chinese patent application number 200310112701.6 discloses a preparation method of a halogen-free flame-retardant dynamic vulcanization EPDM / PP elastomer, the flame retardant used is large, easy to absorb water and precipitate, seriously reducing the material Mechanical properties and aging properties; Chinese patent application number 201110138957.9 discloses a preparation method of a nitrogen-phosphorous system halogen-free flame-retardant dynamic vulcanization EPDM / PP elastomer. Mix and knead into semi-finished particles, and then add SEBS, nitrogen and phosphorus flame retardants and additives for mixing and plasticization. The prepared elastomer has unsatisfactory flame retardancy and compression properties due to the introduction of SEBS.

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