A high-bonding vibration-absorbing polyurethane repair material for settlement repair of solidified ballast bed

A repair material, polyurethane technology, applied in the direction of track, road, track maintenance, etc., can solve the problems of aggravated railway transportation and line maintenance and repair, increased maintenance and repair workload, poor maintainability of ballastless track, etc., and achieves strong deformation ability , high dimensional stability, good damping effect

Active Publication Date: 2018-01-12
CHINA ACADEMY OF RAILWAY SCI CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ballasted track has the advantages of low cost, simple construction, good elasticity and maintainability. However, with the rapid development of my country's economy, high-speed railway and heavy-duty railway are the main directions of railway development in my country. The increase of axle load increases the workload of maintenance and repair of ballasted track, which further intensifies the contradiction between railway transportation and line maintenance and repair; ballastless track has the advantages of strong integrity, high stability and less maintenance workload, but The ballastless track requires a solid offline foundation, and the maintainability of the ballastless track is poor, and the project cost is relatively high

Method used

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  • A high-bonding vibration-absorbing polyurethane repair material for settlement repair of solidified ballast bed
  • A high-bonding vibration-absorbing polyurethane repair material for settlement repair of solidified ballast bed
  • A high-bonding vibration-absorbing polyurethane repair material for settlement repair of solidified ballast bed

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0024] Specific Example 1 is shown in Table 1.

[0025] Drill the core of the concrete test piece and cut it into a sample with a size of φ50mm×25mm. Place the two samples in the center with a distance of 20mm between the samples. Seal the samples around with kraft paper and wide tape, leaving a grouting hole in the upper part , Use an electric mixer to mix the A component and B component into the cavity after high-speed mixing, demould after 1d, stick the metal side head on the outside of the concrete sample, and use the electronic universal testing machine to test the polyurethane repair material and The bonding properties of concrete materials, the tensile rate is 10mm / min. The maximum load of the fatigue resistance test is 0.3MPa, the minimum load is 0.03MPa, and the loading frequency is 5HZ. The thickness of the sample before and after loading is measured with a vernier caliper, and the cumulative residual deformation is calculated after 5 million times. The test results ar...

specific Embodiment 2

[0032] Specific Example 2 is shown in Table 3.

[0033] Table 3 Specific Example 2

[0034]

[0035]

[0036] Note: Mw in the table represents the average molecular weight of the compound.

[0037] The test method of specific embodiment 2 is the same as that of embodiment 1, and the implementation effect is shown in Table 4.

[0038] Table 4 Properties of the polyurethane repair material produced according to specific example 2

[0039] Serial number

specific Embodiment 3

[0041] Specific Example 3 is shown in Table 5.

[0042] Table 5 Specific Example 3

[0043]

[0044] Note: Mw in the table represents the average molecular weight of the compound.

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Abstract

The invention relates to a high-bonding and vibration-absorbing polyurethane repairing material used for repairing the settlement of polyurethane solidified ballast beds of high-speed railways or heavy-duty railways. The material is made by mechanical mixing and stirring of component A and component B. The mass ratio of component A to component B is 1:0.9~1:1.5; component A is HDI trimer and polymethylene A mixture of polyphenylisocyanates, the mass ratio of the two is 3:7~6:4, and the -NCO content is 27%~29%; B component is polyol, catalyst, defoamer, water remover, anti-aging agent It is composed of agent, flame retardant and rubber particles, and is characterized in that the polyol is a mixture of 6-functionality mannitol polyoxypropylene polyol and 3-functionality high molecular weight polyether polyol with a molecular weight of 12,000. The polyurethane repair material prepared according to the present invention has a volume expansion rate of 1% to 3%, a 1h compressive strength ≥ 12MPa, a bond strength ≥ 6MPa, and a damping factor of 0.25 to 0.40; after 5 million times of fatigue loading, the accumulated residual deformation is ≤ 0.5%, this material can be used for settlement repair of polyurethane cured ballast bed, and can also be used for repair of ballast glue cured ballast bed settlement.

Description

Technical field [0001] The invention relates to a high-bonding and vibration-damping polyurethane repair material used for the settlement repair of a polyurethane cured track bed of a high-speed railway or a heavy-duty railway. It can be used for the repair of the aging damage of the cured track bed structure, and is also suitable for high-speed railway ballast-no ballast The damage and settlement repair of the ballast glue-cured track bed in the track transition zone belongs to the technical field of microcellular foamed polyurethane elastomer. Background technique [0002] Ballasted track has the advantages of low cost, simple construction, good flexibility and repairability. However, with the rapid development of my country’s economy, high-speed railways and heavy-haul railways are the main directions of my country’s railway development. The increase in axle load increases the workload of maintenance and repair of ballasted tracks, which further intensifies the contradiction be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L7/00C08G18/79C08G18/76C08G18/48C08G18/22C08K13/02C08K5/524C08K5/521E01B37/00
Inventor 谢永江李书明郑新国曾志刘竞翁智财王月华张雯杨德军刘相会
Owner CHINA ACADEMY OF RAILWAY SCI CORP LTD
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