EPDM/polypropylene thermoplastic elastomer and preparation process thereof

Abstract

The invention relates to an EPDM (Ethylene-Propylene-Diene Monomer) / polypropylene thermoplastic elastomer and a preparation process thereof. The EPDM / polypropylene thermoplastic elastomer is characterized by comprising the following components in parts by weight: 1065-1250 parts of PP (Poly Propylene ) raw material, 150-550 parts of plasticized rubber powder, 60-80 parts of naphthenic oil, 80-180 parts of POE (Poly Olefin Elastomer), 100-150 parts of 250-mesh talcum powder, 3-7 parts of antioxidant 1010, 10-30 parts of PE (Poly Ethylene) wax, 15-45 parts of butyl methacrylate and 4.5-15 parts of DCP, wherein the plasticized rubber powder is obtained from the waste ethylene -propylene-diene monomer powder through preprocessing, and a formula for the preprocessing includes 1500 parts by weight of 80-mesh waste ethylene -propylene-diene monomer powder, 100-200 parts by weight of solid coal tar, 5-10 parts by weight of activator, 20-40 parts by weight of surfactant and 20-40 parts by weight of 1250-mesh talcum powder. The thermoplastic elastomer is wide in hardness change range, high in strength, and remarkably improved in physical and mechanical properties.

Description

technical field [0001] The invention relates to a thermoplastic elastomer material, in particular to an EPDM rubber / polypropylene thermoplastic elastomer and a preparation process thereof, belonging to the field of resource recycling of waste tires (waste EPDM rubber). Can be used in outdoor sports equipment, motor vehicles, marine outdoor plastic products. Background technique [0002] Thermoplastic Elastomer (TPE), also known as Thermoplastic Rubber (TPR), is a material that has both rubber and thermoplastic properties. Thermoplastic elastomers have a variety of possible structures. The most fundamental one is the need to have at least two mutually dispersed The polymer phase, at normal use temperature, one phase is fluid (the temperature is made above its glass transition temperature), the other phase is solid (the temperature is made below its glass transition temperature), and there is mutual interaction between the two phases. effect. That is, a polymer material ...

AI Technical Summary

Problems solved by technology

At present, the method of using waste tires (waste EPDM rubber) to prepare thermoplastic elastomers is to first crush them into vulcanized rubber powder, and then blend them with other polymers, and their properties are very different from those of unvulcanized rubber. , the vulcanized rubber powder obtained by crushing waste rubber products, its structure is still a network structure of three sulfur bond states of monosulfide, disulfide and polysulfide formed at the crosslinking point of vulcanized rubber. Linked, physical coagulated random polymer elastomers, when blended with other polymers, have poor compatibility with the blended matrix material, and the blended system with plastic materials is an incompatible system

Therefore, before melt blending, it is necessary to desulfurize the vulcanized rubber powder and modify its surface to improve its fluidity and reactivity. However, the conventional desulfurized and compatibilized rubber powder cannot reach the activation level Requirements, the desulfurized rubber powder is often desulfurized on the outer edge of the rubber particles, and the inner core is still vulcanized rubber, and the conventional coupling agent, usually using a silane coupling agent, is sensitive to plastics and insensitive to rubber with complex components, so it is difficult to achieve Activation treatment requirements, while affecting the effect of subsequent processes

Images