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Base plate material for rail fastener, preparation method and application of base plate material

A backing plate and fastener technology, which is applied in the direction of tracks, fixed rails, buildings, etc., can solve the problems of small-radius curved backing plate crushing failure, etc., and achieve the effect of increasing the ability to resist lateral deformation

Inactive Publication Date: 2016-10-12
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the existing backing plate structure and materials cannot meet the requirements of on-site use, it is common for small-radius curved backing plates to collapse and fail in a short period of time.

Method used

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  • Base plate material for rail fastener, preparation method and application of base plate material
  • Base plate material for rail fastener, preparation method and application of base plate material
  • Base plate material for rail fastener, preparation method and application of base plate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 The backing plate material for the rail fastener of the present invention

[0062] A backing plate material for rail fasteners, the backing plate material is made of A component and B component, wherein the A component is made from the raw materials of the following formula:

[0063]

[0064] B component is prepared by the reaction of 199g B-1PTMG2000 and 49.8g B-2 naphthalene diisocyanate (NDI), wherein the isocyanate content of B component is 5% (w / w);

[0065] The ratio of the amount of the isocyanate group in the B component to the amount of the hydroxyl group in the A component is 1.05;

[0066] The preparation method of the above-mentioned backing plate material comprises the following steps:

[0067] 1) 199g of PTMG2000 was heated to 130°C and dehydrated under vacuum for 2h;

[0068] 2) Keep the product obtained in step 1) at 130°C, and directly add the NDI of the formula amount. After the addition, the system will have a cooling phenomenon, and ...

Embodiment 2

[0071] Example 2 Backing plate of the present invention

[0072] The backing material of Example 1 was used to prepare backing sheets of the present invention. The specific preparation method is as follows:

[0073] 1) 199g of PTMG2000 was heated to 130°C and dehydrated under vacuum for 2h;

[0074] 2) Keep the product obtained in step 1) at 130°C, and directly add the NDI of the formula amount. After the addition, the system will have a cooling phenomenon, and then the system will heat up due to the exothermic reaction, and the system temperature will reach 130°C for 30 minutes. ;

[0075] 3) After 30min, the system begins to cool down, and when it falls to 70°C, it is used as component B for standby;

[0076] 4) Fix the cloth between the upper and lower molds, with both ends longer than the size of the mold, and stretch both ends of the cloth to keep the cloth straight in the mold.

[0077] 5) Quickly mix the B component with a material temperature of 70 °C obtained in...

Embodiment 3

[0080] Example 3 Screening of Types of A-1 Chain Extenders

[0081] Using the raw materials of the formula shown in Table 1, the backing plate material for rail fasteners was prepared by the method shown in Example 1, and then the backing plate for rail fasteners was prepared by using this material and the method described in Example 2. When A-1 is 1,4-butanediol, ethylene glycol, 1,3-propanediol, 1,4-cyclohexanediol and diethylene glycol respectively, the pads are numbered 1#, 2 #, 3#, 4# and 5#. Then, the ratio of dynamic and static stiffness, compression set, Akron wear, rate of change of thickness after fatigue, rate of change of static stiffness after fatigue were measured respectively for the 5 groups of backing plates. Execution; Akron wear and compression set were performed in accordance with TB / T 2626-1995, and the results are shown in Table 1.

[0082] Table 1

[0083]

[0084]

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Abstract

The invention provides a base plate material for a rail fastener, and a preparation method and application of the base plate material. The base plate material is prepared from a component A and a component B, wherein the component A is prepared from the following raw materials in parts by mass: 100 parts of chain extender A-1, 0-50 parts of water A-2, 10-100 parts of foam stabilizers A-3 and 0.1-2 parts of catalysts A-4, and the component B is prepared from polyether polyol B-1 and isocyanate B-2 by reaction, wherein the content of the isocyanato of the component B is 1%-10% (w / w), and the ratio of the amount of the isocyano in the component B to the amount of hydroxy in the component A is 1.05-1.15. The polyurethane material has better wear resistance, fatigue resistance and resilience characteristic; in addition, a fiber-reinforced layer is added to a novel small-radius curve base plate prepared from the polyurethane material, the transverse deformation resistance of the base plate can be greatly increased, the rigidity of the base plate can be improved, and accordingly, vertical deformation is decreased.

Description

technical field [0001] The invention belongs to the technical field of railway rail fasteners, and particularly relates to a backing plate material for rail fasteners and a preparation method and application thereof. Background technique [0002] The under-rail pad is an important part of the rail fastener, which mainly plays the function of damping and buffering. The vibration generated by the wheel-rail impact is all transmitted downward through the under-rail pad. The good-quality under-rail pad can well attenuate the wheel-rail vibration, absorb energy, and reduce the impact of the wheel-rail impact on the track structure while maintaining the elasticity of the track. destroy. The small radius curve pad is used in the small radius curve area. In addition to the vertical force generated by the normal vehicle weight, it also needs to withstand the horizontal lateral force caused by the turning centrifugal force. Therefore, its use conditions are very harsh. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08J9/08E01B9/68C08G101/00
CPCC08G18/4854C08G18/6674C08G18/7678C08G2110/0083E01B9/681
Inventor 杜卫超毛昆朋赵云行马运章徐超贾颖华陈梦
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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