Passenger and freight collinear railway polyurethane microporous base plate and preparation method thereof

A technology of polyurethane, passenger and freight, which is applied in the field of polyurethane microporous pads and its preparation for passenger and freight railways. Stability, small change in static stiffness, and long service life

Pending Publication Date: 2021-12-24
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the existing polyurethane backing plates for ballastless tracks have low rigidity and are not suitable for passenger-cargo collinear ballasted railways with high load-bearing requirements and large lateral forces, especially passenger-cargo collinear railways with a curve radius of 295m≤R≤600m At this time, the bearing capacity of the ballasted track reached 150KN, and the angle α with the rail was relatively large, reaching 38°. Not only the vertical loading force was large, but the horizontal force value reached 60KN. During the general assembly fatigue test process, Due to the high bearing capacity and the lateral displacement of the rail, after the assembly fatigue of the polyurethane microporous backing plate, the outer edge of the product is easy to crack, and the residual deformation is large, and the static stiffness change rate is high

Method used

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  • Passenger and freight collinear railway polyurethane microporous base plate and preparation method thereof
  • Passenger and freight collinear railway polyurethane microporous base plate and preparation method thereof
  • Passenger and freight collinear railway polyurethane microporous base plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Preparation of Component A: Weigh 55 parts of methyl-modified polytetrahydrofuran ether diol, 30 parts of polyether polyol 330, add 0.05 parts of phosphoric acid, heat up to 105°C for vacuum (≤-0.095MPa) dehydration for 4 hours, cool down to Add 26 parts of xylylmethane diisocyanate (MDI-100) at 45°C, react at 85°C for 4 hours, cool down to 50°C, and pack for use.

[0059] Preparation of component B: Add 35 parts of methyl-modified polytetrahydrofuran ether diol and 7 parts of 1,4-butanediol into the reaction kettle, and raise the temperature to 105°C for vacuum dehydration for 2 hours, then drop the temperature to 43°C, and then add 2 parts of foam stabilizer, 4 parts of catalyst 33LV, 4 parts of catalyst MB20, 0.7 part of water and 0.3 part of blue color paste (phthalocyanine blue series), stir and mix evenly, pack for use.

[0060] Preparation of backing plate: raise the temperature of component A to 45°C, and the temperature of component B to 43°C, mix component A a...

Embodiment 2

[0062] Preparation of Component A: Weigh 100 parts of ethyl-modified polytetrahydrofuran ether diol, 20 parts of polyether polyol 330, add 0.07 parts of phosphoric acid, heat up to 105°C for vacuum (≤-0.095MPa) dehydration for 4 hours, cool down to Add 37 parts of xylylmethane diisocyanate (MDI-100) at 45°C, react at 85°C for 4 hours, cool down to 50°C, and pack for use.

[0063] Preparation of Component B: Add 1.4 parts of 1,4-butanediol into the reactor, heat up to 105°C for vacuum dehydration for 2 hours, then drop the temperature to 43°C, add 5 parts of foam stabilizer, 4 parts of catalyst 33LV, 4 parts 1 part of catalyst MB20, 0.7 part of water and 0.3 part of blue color paste (phthalocyanine blue series), stir and mix evenly, and pack for use.

[0064] Preparation of backing plate: raise the temperature of component A to 60°C, and the temperature of component B to 40°C, mix component A and component B according to the mass ratio of 100:11 and pour them into a mold with a...

Embodiment 3

[0066] Preparation of Component A: Weigh 50 parts of EO modified polytetrahydrofuran ether diol, 20 parts of polyether polyol 330, add 0.05 parts of phosphoric acid, heat up to 105°C for vacuum (≤-0.095MPa) dehydration for 4 hours, cool down to 45 °C, add 37 parts of xylylmethane diisocyanate (MDI-100), react at 90 °C for 4 hours, cool down to 50 °C, and pack for use.

[0067] Preparation of component B: Add 50 parts of EO-modified polytetrahydrofuran ether diol and 5 parts of 1,4-butanediol into the reaction kettle, and raise the temperature to 105°C for vacuum dehydration for 2 hours, then drop the temperature to 40°C, and then add 2 1 part of foam stabilizer, 4 parts of catalyst 33LV, 4 parts of catalyst MB20, 0.7 part of water and 0.3 part of blue color paste (phthalocyanine blue series), stir and mix evenly, and pack for use.

[0068] Preparation of backing plate: raise the temperature of component A to 38.5°C, and the temperature of component B to 39°C, mix component A a...

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Abstract

The invention discloses a passenger and freight collinear railway polyurethane microporous base plate and a preparation method thereof. The polyurethane microporous base plate is prepared by mixing a component A and a component B according to the mass ratio of 100: (7-65); the component A is prepared from the following raw materials in parts by weight: 26 to 42 parts of aromatic diisocyanate, 50 to 100 parts of polytetrahydrofuran ether glycol with modified side groups, 15 to 35 parts of polyol A and 0.02 to 0.1 part of retarder, and the polyol A is one or more of polyether polyol and polyester polyol; the component B comprises the following raw materials in parts by weight: 1-10 parts of a chain extender, 6-10 parts of a catalyst, 0.1-5 parts of a foaming agent and 2-5 parts of a foam stabilizer. The crystallization behavior of a soft segment of a molecular chain is destroyed by side group modified polytetrahydrofuran ether glycol, and compared with a high-speed railway ballastless track polyurethane microporous base plate, the prepared polyurethane microporous base plate has the characteristics of high static rigidity and good assembly fatigue performance.

Description

technical field [0001] The invention belongs to the technical field of rail transit fasteners, and in particular relates to a passenger-cargo collinear railway polyurethane microporous backing plate and a preparation method thereof. Background technique [0002] At present, my country has more than 160,000 km of passenger and freight railroads, and most of the shock absorbing components use traditional rubber backing plates, including natural rubber, neoprene rubber, styrene-butadiene rubber, butadiene rubber, etc., because most of the traditional rubber backing plates exist Unsaturated bond, easy to oxidize and become hard and brittle. At the same time, due to the high rigidity of the traditional rubber backing plate used in the passenger-cargo co-linear railway, the elastic type II fastener system adopts the method of surface slotting to reduce the rigidity, resulting in poor durability of the traditional rubber backing plate, short service life, and increased maintenance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G101/00
CPCC08G18/4862C08G18/4854C08G18/4804C08G18/7671C08G18/6674C08G18/3206C08G2101/00C08G2110/0083
Inventor 张凤桥蒋集成朱志勇黄安民谢彦飞张友南颜湘姚春勇
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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