A kind of thermoplastic elastomer and preparation method thereof

Abstract

The invention discloses thermoplastic elastomer and a preparation method thereof. The elastomer comprises a component A and a component B, wherein the component A comprises, by mass, 55-65% of ethylene-propylene-diene-monomer rubber, 25-35% of polypropylene resin, 0.45-0.55% of lubricant, 2.5-3.5% of cross-linking agents, 0.45-0.55% of assistant cross-linking agent, 4.5-5.5% of zinc oxide and 0.9-1.1% of stearic acid; the mass percentage of the ingredients sums up to 100%; the component B is compatibilizer, and the application amount of the compatibilizer takes up 2-10% of the total weight of the component A. By means of the thermoplastic elastomer, compatibility among plastic rubber can be enhanced, the mechanical property of a product can be improved, and the product processing difficulty can be reduced.

Description

technical field [0001] The invention relates to a thermoplastic elastomer and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] When the TPV thermoplastic elastomer with dicumyl peroxide (DCP) as the vulcanizing agent is dynamically vulcanized, the theoretically obtained elastomer network structure has a carbon-carbon bond with high bond energy, and is very stable, and the material has good aging resistance , but in the presence of PP, the peroxide radical absorbs the hydrogen on the polyolefin chain to generate unstable tertiary radicals, resulting in chain scission. This directly leads to the deterioration of the compatibility and processing performance between the plastic and rubber phases, and the mechanical properties of the obtained materials are seriously reduced. Most of the existing technologies improve the compatibility between rubber and plastic from the preparation process, such as increasing the s...

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Problems solved by technology

[0002] When the TPV thermoplastic elastomer with dicumyl peroxide (DCP) as the vulcanizing agent is dynamically vulcanized, the theoretically obtained elastomer network structure has a carbon-carbon bond with high bond energy, and is very stable, and the material has good aging resistance , but in the presence of PP, the peroxide radical absorbs hydrogen on the polyolefin chain to generate unstable tertiary radicals, resulting in chain scission

This directly leads to the deterioration of the compatibility and processing performance between the plastic and rubber phases, and the mechanical properties of the obtained materials are seriously reduced.

Most of the existing technologies improve the compatibility between rubber and plastic from the preparation process, such as increasing the shear force of the blending equipment to cut EPDM particles into small particles and disperse them more uniformly in PP to improve compatibility, but this It has high requirements on equipment, and also requires technicians to have rich operating experience, and the effect is not very ideal.

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