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

A thermoplastic elastomer and shock-absorbing pad technology, which is applied in the field of micro-foamed thermoplastic elastomer for high-speed rail shock-absorbing pads and its preparation, can solve the problem of not fully satisfying high-speed rail shock absorption, difficult to meet shock absorption requirements, and poor mechanical properties. Stability and other issues, to achieve the effect of smooth and flat appearance, satisfying mechanical properties, and no chemical residues

Inactive Publication Date: 2012-05-23
宝瑞龙高分子材料(天津)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: A micro-foamed thermoplastic elastomer for a high-speed rail shock-absorbing backing plate is made from the following raw materials according to the following weight ratio: EPDM rubber 20Kg, polypropylene 20Kg, peroxide 0.1Kg, horse 0.3Kg of imide, 20Kg of naphthenic oil, 1Kg of additives, 30Kg of calcium carbonate and 0.5Kg of dichlorofluorocarbon. The above-mentioned EPDM rubber is any one with an ethylene content of 30%-75%, a Mooney viscosity of 30-80, and an ENB content of 1.0-7.0. The above-mentioned polypropylene is copolymerized or homopolymerized, and MI is any one of 3-22. The above additives are mixed with antioxidant and lubricating oil.

Embodiment 2

[0016] Embodiment 2: A micro-foamed thermoplastic elastomer for a high-speed rail shock-absorbing backing plate is made from the following raw materials according to the following weight ratio: EPDM rubber 80Kg, polypropylene 80Kg, peroxide 10Kg, Malay Imide 60Kg, naphthenic oil and linear paraffin oil 150Kg, additives 10Kg, talcum powder 50Kg and compressed nitrogen 3Kg. The above-mentioned EPDM rubber is any one with an ethylene content of 30%-75%, a Mooney viscosity of 30-80, and an ENB content of 1.0-7.0. The above-mentioned polypropylene is copolymerized or homopolymerized, and MI is any one of 3-22. The above-mentioned additives are mixed with antioxidants and anti-ultraviolet agents.

Embodiment 3

[0017] Embodiment 3: A micro-foamed thermoplastic elastomer for a high-speed rail shock-absorbing backing plate is made from the following raw materials according to the following weight ratio: EPDM rubber 50Kg, polypropylene 50Kg, peroxide 5Kg, Malay Imide 30Kg, straight-chain paraffin oil 75Kg, additives 5Kg, barium sulfate 25Kg and low-boiling hydrocarbons 2Kg. The above-mentioned EPDM rubber is any one with an ethylene content of 30%-75%, a Mooney viscosity of 30-80, and an ENB content of 1.0-7.0. The above-mentioned polypropylene is copolymerized or homopolymerized, and MI is any one of 3-22. The above-mentioned additives are mixed with antioxidant, anti-ultraviolet agent and lubricant.

[0018] The preparation method of the micro-foamed thermoplastic elastomer for the above-mentioned high-speed iron shock-absorbing backing plate is: mixing polypropylene, EPDM rubber, micro-foaming agent, filler, auxiliary agent, etc. in a high-mixing pot, adding them to the double In t...

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L23/12C08L23/14C08K13/02C08K3/26C08K3/34C08K3/30C08J9/04
Inventor 郝文龙
Owner 宝瑞龙高分子材料(天津)股份有限公司
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