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Microporous rubber backing plate and its preparation process

A technology of microporous rubber and preparation process, applied in the field of microporous rubber, can solve the problems of reducing the tensile strength of the material, reducing the density of the rubber material, and high temperature dependence, so as to maintain the deformation recovery ability, prolong the service life, and reduce the stiffness. Effect

Active Publication Date: 2017-05-24
HENGSHUI ZHONGTIEJIAN ENG RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyurethane materials have poor hydrolysis resistance, large fluctuations in product performance, and unstable static stiffness and dynamic-static stiffness ratio, resulting in unstable running of the train and affecting the speed increase and comfort of the train;
[0006] 2. Large temperature dependence
[0008] 3. The overall performance needs to be further improved
Increasing the foaming ratio of the microcellular rubber material and reducing the density of the rubber material can reduce the static stiffness of the backing plate, but the tensile strength of the material is often reduced while increasing the foaming ratio, making it unable to meet the use requirements

Method used

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  • Microporous rubber backing plate and its preparation process
  • Microporous rubber backing plate and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation technology of microporous rubber backing plate of the present invention comprises the following steps:

[0054] The first step mixing

[0055] Put 100 parts by weight of EPDM rubber on the open mill and put it into the internal mixer 15 times, and then put in 5 parts by weight of active agent, 60 parts by weight of filling material and 30 parts by weight of paraffin oil, and mix for 10 minutes. The rotation speed is 15r / min, the debinding temperature is 130°C, after cooling to room temperature, it is thinly passed on the mill for 4 times, and 6 parts by weight of polyethylene glycol mixture, 6 parts by weight of foaming agent, 2.5 parts by weight of vulcanizing agent and 2 parts by weight of vulcanizing agent are added successively. part accelerator, mixed evenly to obtain rubber compound;

[0056] Step 2 Foaming and vulcanization

[0057] Vulcanize on a plate vulcanizer at 155°C for 25min, with a vulcanization pressure of 4MPa.

Embodiment 2

[0059] The preparation technology of microporous rubber backing plate of the present invention comprises the following steps:

[0060] The first step mixing

[0061] Put 100 parts by weight of EPDM rubber on the open mill for 15 times into the internal mixer, and then put in 7 parts by weight of active agent, 80 parts by weight of filler material and 45 parts by weight of paraffin oil, and mix for 12 minutes. The rotation speed is 20r / min, the degumming temperature is 140°C, after cooling to room temperature, it is thinly passed on the open mill for 5 times, and 12 parts by weight of polyethylene glycol mixture, 8 parts by weight of foaming agent, 4 parts by weight of vulcanizing agent and 3.75 parts by weight of foaming agent are added in sequence. part accelerator, mixed evenly to obtain rubber compound;

[0062] Step 2 Foaming and vulcanization

[0063] Vulcanize on a flat vulcanizer at 155°C for 32.5min with a vulcanization pressure of 6MPa.

Embodiment 3

[0065] The preparation technology of microporous rubber backing plate of the present invention comprises the following steps:

[0066] The first step mixing

[0067] Put 100 parts by weight of EPDM rubber on the open mill for 15 times into the internal mixer, and then put in 9 parts by weight of active agent, 100 parts by weight of filler material and 60 parts by weight of paraffin oil, and mix for 14 minutes. The rotation speed is 25r / min, the degumming temperature is 150°C, after cooling to room temperature, it is thinly passed on the open mill for 6 times, and 18 parts by weight of polyethylene glycol mixture, 12 parts by weight of foaming agent, 5.5 parts by weight of vulcanizing agent and 5.5 parts by weight of foaming agent are added successively. part accelerator, mixed evenly to obtain rubber compound;

[0068] Step 2 Foaming and vulcanization

[0069] Vulcanize on a plate vulcanizer at 155°C for 40min, and the vulcanization pressure is 8MPa.

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Abstract

The invention belongs to the technical field of microporous rubber and discloses a microporous rubber base plate and a preparation process thereof. The microporous rubber base plate has the major technical characteristic that the microporous rubber base plate body is prepared from the following components in parts by weight: 100 parts of ethylene-propylene-diene rubber, 6-18 parts of polyethylene glycol mixture, 60-100 parts of a filling material, 30-60 parts of alkane oil, 6-12 parts of a foaming agent, 2.5-5.5 parts of a vulcanizing agent and 2-5.5 parts of an accelerant. According to the microporous rubber base plate, an evenly diffused multi-phase structure is formed by mechanically blending low-Mooney EPDM and high-Mooney EPDM, and in combination with benzenesulfonic acid formed in the reaction process of neutralizing the foaming agent 4,4-oxodibenzenesulfonyl hydrazide by use of the polyethylene glycol mixture, the foaming ratio can be increased. In addition, accessories carbon black excellent in reinforcement property and porous diatomite filler excellent in aging property and light in weight are adopted, and consequently, the microporous rubber base plate has such properties as high strength, low rigidity and low temperature dependency.

Description

technical field [0001] The invention belongs to the technical field of microporous rubber, and in particular relates to a microporous rubber backing plate under an elastic support block with high strength, low density, low stiffness and low temperature dependence and a preparation process thereof. Background technique [0002] The elastic support block track structure is a low-vibration under-rail foundation. The double-layer elastic system is composed of the microporous rubber backing plate under the support block and the rubber backing plate of the fastener under the rail, so that the combined stiffness of the track is close to that of the ballasted track. Improve the elasticity of ballastless track. From the perspective of the domestic situation, Beijing, Guangzhou and Shanghai subways have been paved and operated for many years, and the use effect is good. A large number of research results show that: the stiffness of the fastener under the rail and the microporous rubb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08L71/08C08K5/47C08K13/02C08K3/22C08K3/04C08J9/06C08K3/34C08K5/14C08K5/40C08K5/09C08K3/06
CPCC08J2323/16C08L23/16C08L2205/025C08L2205/035C08L71/08C08K13/02C08K3/04C08K3/34C08K3/06C08K5/14C08K5/40C08K5/47C08K2003/2296C08K5/09C08J9/06
Inventor 赵雅婷温世鹏刘力贾雷雷李春雅
Owner HENGSHUI ZHONGTIEJIAN ENG RUBBER
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