High-performance dynamically-vulcanized thermoplastic elastomer and preparation method thereof

Abstract

The invention provides a high-performance dynamically-vulcanized thermoplastic elastomer and a preparation method thereof. The high-performance dynamically-vulcanized thermoplastic elastomer is prepared from the following raw materials in parts by mass: 100 parts of halogenated butyl rubber, 30-70 parts of nylon, 5-30 parts of a compatibilizer, 5-20 parts of a plasticizer, 0-20 parts of a filler,0.1-5 parts of an antioxidant, 1-5 parts of a vulcanization system and 1-5 parts of an anti-aging agent, wherein the filler is modified nano clay. The preparation method comprises the following steps:(1) mixing halogenated butyl rubber with the anti-aging agent, the plasticizer, part of the vulcanization system and the filler to prepare masterbatch; (2) placing the masterbatch in a drying box forcarrying out pre-vulcanization to obtain pre-vulcanized masterbatch; (3) adding the pre-vulcanized masterbatch, the nylon, the compatibilizer and the antioxidant into an internal mixer for uniformlymixing; and (4) adding the remaining vulcanization system into the internal mixer to prepare the dynamically-vulcanized thermoplastic elastomer. The prepared dynamically-vulcanized thermoplastic elastomer is excellent in mechanical performance, high in gas tightness and wide application range.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-performance dynamic vulcanized thermoplastic elastomer and a preparation method thereof. Background technique [0002] Dynamically vulcanized thermoplastic elastomers are vulcanized and uniformly dispersed into the continuous plastic phase by using mixing equipment under the conditions of high temperature, high shear and other processing aids. The elasticity and high tensile strength of plastics can be processed by various processing methods of plastics, and it has the advantage of being recyclable. [0003] Butyl rubber, halogenated butyl rubber and nylon all have good airtightness, and the dynamic vulcanization of the two can prepare thermoplastic elastomers with high airtightness, which can be applied to tire inner liners, automobile sealing strips, etc. Patent CN103788515 B discloses a thermoplastic vulcanizate with high gas barrier performance and its prepa...

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Problems solved by technology

Patent CN103788515 B discloses a thermoplastic vulcanizate with high gas barrier performance and its preparation method. The compatibilizer and nylon 12 are blended and grafted in an internal mixer, and the stabilizer is mixed with bromobutyl rubber and grafted. Nylon 12 and other additives are pre-mixed, and a dynamically vulcanized thermoplastic elastomer is prepared by twin-screw extrusion. The obtained material has good air tightness and processing properties, but its poor mechanical properties limit its application.

Patent CN 105524362 B discloses a method for preparing a rubber-plastic composition. In this method, the modified rubber is obtained by blending halogenated butyl rubber, low-molecular-weight nylon and an activator, and then the modified rubber, copolymerized nylon, Extrusion and granulation of long-chain nylon etc. under dynamic vulcanization conditions, the prepared material has excellent air tightness and mechanical properties, but the preparation process is complicated and the cost is high, which is not conducive to its application

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