Ultrahigh-flowability dynamic vulcanized thermoplastic elastomer and preparation method thereof

Abstract

The invention relates to an ultrahigh-flowability dynamic vulcanized thermoplastic elastomer and a preparation method thereof. The preparation method comprises the following steps: after homogenizingand mixing ethylene-propylene-diene monomer, atactic polypropylene, fillers and a first aid into a high-speed stirring pot for 1 to 2 minutes, performing plasticizing granulation in a double-screw extruding machine to generate an intermediate; and after homogenizing and mixing the obtained intermediate, a crosslinking agent, an assistant crosslinking agent and a second aid into a high-speed mixingmachine for 1 to 2 minutes, adding filling oil through a liquid feeding port of the high-speed mixing machine and performing dynamic vulcanized granulation through the double-screw extruding machineto prepare the ultrahigh-flowability dynamic vulcanized thermoplastic elastomer which has ultrahigh flowability, excellent physical and mechanical properties and high elasticity, and has important significance in broadening the application field of thermoplastic elastomers.

Description

technical field [0001] The invention relates to a thermoplastic elastomer material and a preparation method thereof, in particular to a dynamic vulcanized thermoplastic elastomer with ultra-high fluidity and a preparation method thereof. Background technique [0002] Dynamic vulcanization thermoplastic elastomer material has excellent weather resistance, ozone resistance, ultraviolet resistance and good high temperature performance, electrical performance, impact performance, and it can be processed without traditional vulcanization process, and can be processed with standard thermoplastic processing equipment It has the advantages of simple processing, continuous production, low processing cost, and recyclable leftovers. Its consumer market is mainly the automobile industry, and it has also been widely used in wires and cables, special hoses, industrial components, home appliances, and mechanical parts. Its fields are gradually expanding, and its usage is increasing year by...

AI Technical Summary

Problems solved by technology

[0003] Although dynamically vulcanized thermoplastic elastomer materials have excellent performance in many aspects, their flow properties are poor, and it is not easy to be used for injection molding of large devices and precision injection molding of small devices, which largely limits their use in high-end fields. application in

The root cause of its poor fluidity is that the mass percentage of EPDM in the system exceeds 50%. Although the "phase inversion" is achieved during the dynamic vulcanization process, the fluidity of the product is still poor. , In the process of injection molding finished products, problems such as lack of glue, injection flow lines and weld lines are prone to occur, resulting in high defective and scrap rates

[0004] In order to solve this problem, there is a method of reducing the viscosity of the system and increasing the fluidity of the system by adding a large amount of extender oil, but this method not only leads to a significant decrease in the physical and mechanical properties of the elastomer such as tensile strength and elastic modulus, but also due to the ternary Ethylene-propylene rubber has limited oil absorption capacity, and a large amount of extender oil is likely to cause a risk of oil bleeding

[0005] In addition, there is also a method to reduce the viscosity of the system and increase the fluidity of the system by adding POE, a low-viscosity elastomer. However, due to the low glass transition temperature and softening temperature of POE, the temperature resistance of the finished product is reduced, and the surface is easy to stick. Requirements for quality finished products on temperature resistance and product appearance

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