Microcellular foam thermoplastic elastomer for high-speed railway damping base plate and preparation method thereof

Abstract

The invention discloses a microcellular foam thermoplastic elastomer for a high-speed railway damping base plate. The microcellular foam thermoplastic elastomer is prepared from the following raw materials in parts by weight: 20-80 parts of ethylene propylene diene rubber, 20-80 parts of polypropylene, 0.1-10 parts of a crosslinking agent, 0.3-60 parts of a crosslinking catalyst, 0.5-3 parts of a microcellular foaming agent and 1-10 parts of an aid. A molded product in the invention is a closed-pore microcellular foam elastomer product of which the pore diameter is dozens of microns, and has the advantages of smooth and even appearance, independent air bubbles, small foams and no residue of chemical substances. Meanwhile, the weight of the molded product can be reduced by 10-40 percent, absorbed energy can be increased by 3-5 times under the action of impact, and original crack tips can be passivated, so that the toughness of a material is enhanced, fatigue life is prolonged, and the requirements of physical property, elasticity, kinetic energy absorption and the like on the high-speed railway damping base plate can be met.

Description

Technical field: [0001] The invention belongs to a polymer material, in particular to a micro-foamed thermoplastic elastomer for a high-speed rail shock-absorbing backing plate and a preparation method thereof. Background technique: [0002] With the rapid development of modern high-speed railways, the high-speed operation of trains has put forward higher requirements for the shock absorption performance of high-speed railways. The original rubber pads, EVA pads, and TPU pads have been difficult to meet the growing high-speed railway. Require. Micro-foamed thermoplastic elastomers have been applied to the shock absorption field of high-speed railways because of their good mechanical properties, excellent heat resistance, chemical resistance, weather resistance and aging resistance, but chemical foaming is commonly used There are no independent bubbles in the pure foamed thermoplastic elastomer prepared by the method, the bubbles are large, and there are chemical substances ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of modern high-speed railways, the high-speed operation of trains has put forward higher requirements for the shock absorption performance of high-speed railways. The original rubber pads, EVA pads, and TPU pads have been difficult to meet the growing high-speed railway. Require

Micro-foamed thermoplastic elastomers have been applied to the shock absorption field of high-speed railways because of their good mechanical properties, excellent heat resistance, chemical resistance, weather resistance and aging resistance, but chemical foaming is commonly used There are no independent bubbles in the pure foamed thermoplastic elastomer prepared by the method, the bubbles are large, and there are chemical substances remaining, and its mechanical properties are unstable, which cannot fully meet the needs of high-speed rail shock absorption.