Fabrication method of track damping base plate

A production method and technology of shock absorbing pads, which are applied in the direction of tracks, fixed rails, buildings, etc., can solve the problems of poor aging resistance of shock absorbing pads, non-reusable use, environmental impact, etc., and achieve excellent comprehensive physical and chemical properties , excellent water resistance

Active Publication Date: 2011-08-17
DONGGUAN XIONGLIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, a shock-absorbing backing plate used in ballastless track technology is mainly formed by casting polyurethane elastomer (CPU). This kind of shock-absorbing backing plate has poor aging res

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0010] First embodiment (perfusion)

[0011] A method for making a rail shock-absorbing backing plate, reacting 1,4-butanediol, diphenylmethane diisocyanate and polybutylene adipate to obtain thermoplastic TPU, adding foaming agent and auxiliary agent at the same time, and then The mixture is reacted at an appropriate temperature through infusion molding to obtain a shock-absorbing pad.

no. 2 example

[0012] Second embodiment (injection molding)

[0013] A method for making rail shock-absorbing backing plates. The thermoplastic TPU is obtained by reacting 1,4-butanediol, diphenylmethane diisocyanate and polybutylene adipate, and then the mixture is heated at 80-350°C , by means of injection molding with a screw extruder, and placed in a mold cavity to obtain a shock-absorbing backing plate.

no. 3 example

[0014] The third embodiment (cast extrusion)

[0015] A method for making a rail shock-absorbing backing plate, reacting 1,4-butanediol, diphenylmethane diisocyanate and polybutylene adipate to obtain thermoplastic TPU, adding foaming agent and auxiliary agent at the same time, and then The mixture is extruded through a casting extruder under the condition of 50°C-350°C, first formed into a sheet, and then cut into the required shape and specification through a die.

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PUM

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Abstract

The invention discloses a fabrication method of a track damping base plate, including the following steps: subjecting 1,4-butanediol, 4,4'-diphenylmethane diisocyanate and polybutylene adipate to reaction to obtain thermoplastic polyurethane (TPU) and simultaneously adding assistant and foaming agent that is guaranteed to account for 0.01-80% of the total quantity; and then putting the mixture to reaction by means of pouring, injection molding, rolling and the like at 50-350 DEG C to obtain the damping base plate. By overcoming various defects of PVC (polyvinyl chloride) and Pu (polyurethane), TPU owns not only most characteristics of rubber and common plastic, but also excellent comprehensive physical and chemical property. Therefore, the damping base plate formed by TPU, the foaming agent and the assistant has the characteristic of resistance to water, low temperature and ageing, and can naturally degrade when buried underground, causing no harm or toxin to the nature.

Description

technical field [0001] The invention relates to a preparation method of a rail damping backing plate based on a polyurethane composition. Background technique [0002] my country is carrying out large-scale construction of passenger dedicated lines and high-speed railways. By 2020, more than 10,000 kilometers of passenger dedicated lines will be built, forming the skeleton of "four horizontal and four vertical" passenger dedicated lines, and building high-speed railways in the Bohai Rim, Yangtze River Delta and Pearl River Delta regions. More than 2,000 kilometers of railways. The track structure used by the high-speed passenger dedicated line is divided into ballasted track and ballastless track. The ballasted track structure from bottom to top is subgrade-ballast-sleeper-rail, and the ballastless track structure is subgrade-concrete base from bottom to top. - Shock-absorbing pads - Steel rails. Using ballastless track technology, the stability and comfort of high-speed tr...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08G18/66C08G18/42C08J9/04E01B9/68
Inventor 何建雄
Owner DONGGUAN XIONGLIN NEW MATERIAL TECH
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