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Low-lag microcellular rubber material for oscillation reduction of high-speed railway fastener and preparation method thereof

A technology of microporous rubber and high-speed railway, which is applied in the field of fatigue-resistant, high-strength microporous rubber material and its preparation, damping backing material, and low hysteresis. Stiffness ratio, fatigue test and service life and other issues, to achieve the effect of weakening dynamic hysteresis, low dynamic and static stiffness ratio, and increasing elasticity

Active Publication Date: 2010-09-01
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional domestic rubber backing generally implements the industry standard TB / T 2626-95 of the Ministry of Railways. It is only suitable for ordinary railways with a design speed of 120km / h. The rubber backing has no dynamic and static stiffness ratio, fatigue test and service life. requirements, and cannot meet the technical requirements for vibration reduction of high-speed railway fasteners

Method used

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  • Low-lag microcellular rubber material for oscillation reduction of high-speed railway fastener and preparation method thereof
  • Low-lag microcellular rubber material for oscillation reduction of high-speed railway fastener and preparation method thereof
  • Low-lag microcellular rubber material for oscillation reduction of high-speed railway fastener and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: add 100kg EPDM rubber (commercially available EPDM4045) in internal mixer, masticate, then add nano silica 40kg, nano acicular silicate 30kg, nano carbon black N33010kg, silane coupling agent Si-6916kg, mixed for 30 minutes in a mixing room at 100°C, and the rotor speed was 100r / min. Take it out and put it back into another internal mixer after cooling, add 1kg of anti-RD, 4kg of foaming agent AC, 15kg of white ointment, 5kg of zinc oxide, 3kg of stearic acid, 1kg of CZ, 0.5kg of TT, and 0.5kg of DM , Double 2, 52kg, TAIC 3kg, sulfur 2kg, banburying at room temperature for 10min to get a well-mixed rubber compound.

[0028]Put it into a mold with a size of 285×160×10 (mm) for pre-vulcanization, and the process conditions are 120°C×15min×10MPa. Take it out and put it into a mold with a size of 320×180×12 (mm) for foaming and vulcanization. The process conditions are 170°C×20min×10MPa. Take it out and carry out post-processing in an oven at 150° C. for 2 h...

Embodiment 2

[0029] Embodiment 2: add 100kg EPDM rubber (commercially available EPDM4045) in internal mixer, masticate, then add nano silicon dioxide 20kg, acicular silicate 20kg, carbon black N33010kg, silane coupling agent Si- 69 10kg, mixed for 10 minutes in the internal mixing room at 150°C, and the rotor speed was 40r / min. Take it out and put it back into another internal mixer after cooling, add 2kg of anti-RD, 2.5kg of foaming agent AC, 8kg of white ointment, 4kg of zinc oxide, 1.5kg of stearic acid, 0.5kg of CZ, 0.5kg of TT, and 0.5kg of TT. DM 0.5kg, double 2.51kg, TAIC 1kg, sulfur 1kg, banburying at room temperature for 10min to obtain a uniformly mixed rubber compound. Pre-vulcanization, foaming, and post-vulcanization processes are the same as in Example 1. The mechanical properties, static stiffness, dynamic and static stiffness ratio of the obtained microporous EPDM rubber material before and after aging, and the static stiffness change rate and permanent deformation after 3...

Embodiment 3

[0030] Embodiment 3: add 100kg EPDM rubber (commercially available EPDM4045) in internal mixer, masticate, then add nano silicon dioxide 20kg, acicular silicate 15kg, carbon black N3305kg, silane coupling agent Si- 698kg, kneading in the internal mixing room at 130°C for 15min, the rotor speed is 60r / min. Take it out and put it back into another internal mixer after cooling, add 1.5kg of anti-RD, 2kg of foaming agent AC, 5kg of white ointment, 6kg of zinc oxide, 3kg of stearic acid, 1.2kg of CZ, 0.8kg of TT, and DM 1kg, double 2, 52.5kg, TAIC 3kg, sulfur 2.5kg, banburying at room temperature for 10 minutes to obtain a uniformly mixed rubber compound. Pre-vulcanization, foaming, and post-vulcanization processes are the same as in Example 1. The mechanical properties, static stiffness, dynamic and static stiffness ratio of the obtained microporous EPDM rubber material before and after aging, and the static stiffness change rate and permanent deformation after 3 million fatigue ...

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Abstract

The invention discloses a low-lag microcellular rubber material for oscillation reduction of a high-speed railway fastener and a preparation method thereof. The material comprises the following components in part by mass: 100 parts of base rubber, 40 to 80 parts of nano reinforcing filler, 8 to 16 parts of surface modifier, 5 to 15 parts of plasticizer, 1 to 2 parts of age resister, 2 to 4 parts of chemical foaming agent and 10 to 20 parts of curing agent and vulcanizing aid. The preparation method comprises the following steps of: performing banburying on an EPDM, the nano reinforcing filler and the surface modifier under the conditions of high temperature and high shear; adding the chemical foaming agent, the age resister, the plasticizer, the curing agent and the vulcanizing aid, and performing normal banburying on the mixture at room temperature; performing presulfurization on the mixture for 15 minutes at the temperature of 120 DEG C under the vulcanization pressure of 10MPa; foaming and vulcanizing the mixture for 20 minutes at the temperature of 170 DEG C and under the pressure of 10MPa to obtain the microcellular rubber material; and putting the microcellular rubber material in an oven at the temperature of 150 DEG C and then vulcanizing the microcellular rubber material for 2 hours to obtain the product. The product has the advantages of weakened dynamic lag phenomena, lower dynamic-static stiffness ratio, higher mechanical property and fatigue resistance.

Description

technical field [0001] The invention relates to a microporous rubber material and a preparation method thereof, in particular to a microporous rubber material with low hysteresis, fatigue resistance and high strength and a preparation method thereof. Vibration pad material. Background technique [0002] According to my country's "Medium and Long-Term Railway Network Planning", by 2020, the national railway operating mileage will reach more than 120,000 kilometers, and the main busy trunk lines will realize the separation of passenger and cargo lines, basically forming a railway network with reasonable layout, clear structure, complete functions and smooth connection. Establish express passenger transport channels between provincial capital cities and large and medium-sized cities. To this end, the "four vertical and four horizontal" passenger dedicated lines and the intercity passenger transport system in economically developed and densely populated areas are planned, and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K13/02C08K3/34C08K3/36C08K3/04C08K5/54B29C67/20E01B9/68
Inventor 邹华张立群伍社毛田明王士军戴国强姚修祚
Owner BEIJING UNIV OF CHEM TECH
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