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A kind of elastomer used for rail transit under-rail block and preparation method thereof

A rail transit and elastomer technology, applied in the field of rail transit polymer materials, can solve the problems of shortened service cycle, short service life, large temperature influence, etc., and achieve the effect of improving overall performance, improving mechanical properties, and broad application prospects.

Active Publication Date: 2022-04-08
上海鑫普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is worth noting that the rubber material corresponds to the use of different rail transit conditions. In general urban rail transit, rubber backing plates can be used for passenger transportation with light axle loads. However, with the rapid development of domestic rail transit, rubber backing plates can no longer meet the requirements. The shortening of the service cycle will increase the maintenance workload and maintenance cost of public works, which will lead to an increase in the overall cost of maintenance.
[0004] However, most of the existing under-rail pads or under-rail pads on the market are made of conventional rubber materials, which are greatly affected by temperature, have poor protection effects on sleepers, and have poor mechanical properties, resulting in short service life.

Method used

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  • A kind of elastomer used for rail transit under-rail block and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] I. Preparation of Polyester Polyol / Nano-Silica Hybrid Material

[0058] 8g N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane was added dropwise to a solution of 8.3g p-phenylenediisocyanate in toluene / ethyl acetate (100ml, volume ratio = 4:1); The reaction was mechanically stirred for 1.5 h at room temperature, then 141 g of polypropylene malonate and 0.45 g of stannous octoate were added, heated to 70-72 °C and stirred for 8 h at this temperature, and rotary-evaporated to remove the toluene / ethyl acetate solvent. Obtain prepolymer; Disperse 10g nano silica in 100g toluene, ultrasonic 30min, get nano silica dispersion; Next, take 15.2g prepolymer, mix with 12g described nano silica dispersion, 2g Water and 90 g of toluene were mixed, and the reaction was stirred at 80° C. for 3.5 hours, and the toluene and water were removed by rotary evaporation to prepare the polyester polyol / nano-silica hybrid material.

[0059] II. Preparation of Elastomers

[0060] Take 36g polye...

Embodiment 2

[0063] I. Preparation of Polyester Polyol / Nano-Silica Hybrid Material

[0064] 8.2g of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane was added dropwise to a solution of 9g of p-phenylenediisocyanate in toluene / ethyl acetate (110ml, volume ratio = 4:1); The reaction was mechanically stirred for 2h at room temperature, then 150g of polybutylene adipate and 0.6g of dibutyltin dilaurate were added, heated to 75~80°C, and the reaction was stirred at this temperature for 8.5h, and the toluene was removed by rotary evaporation. / ethyl acetate solvent to prepare a prepolymer; disperse 10g of nano-silica in 100g of toluene, and ultrasonically for 30min to obtain a nano-silica dispersion; then, take 23g of prepolymer, mix it with 16g of the nano-dioxide Silica dispersion, 4 g of water and 100 g of toluene were mixed, stirred and reacted at 85° C. for 3.5 h, and rotary evaporated to remove toluene and water to prepare the polyester polyol / nano silica hybrid material.

[0065] II. P...

Embodiment 3

[0069] I. Preparation of Polyester Polyol / Nano-Silica Hybrid Material

[0070] 8.6g of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane was added dropwise to a solution of 10.9g of p-phenylenediisocyanate in toluene / ethyl acetate (120ml, volume ratio=4:1); The reaction was mechanically stirred at room temperature for 2.5h, then 166.4g of polybutylene succinate and 0.72g of dibutyltin dilaurate were added, heated to 82~85°C, and the reaction was stirred at this temperature for 8h. Remove the toluene / ethyl acetate solvent to prepare a prepolymer; disperse 10 g of nano-silica in 100 g of toluene, and ultrasonicate for 30 min to obtain a nano-silica dispersion; The nano-silica dispersion liquid, 4 g of water and 115 g of toluene were mixed, stirred and reacted at 80° C. for 5 h, and rotary steamed to remove toluene and water to prepare the polyester polyol / nano-silica hybrid material.

[0071] II. Preparation of Elastomers

[0072] Take 56.3g of polyester polyol / nano silica hyb...

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PUM

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Abstract

The invention discloses an elastomer used for under-rail pads in rail transit, which is composed of the following components in parts by mass: 35-98 parts of polyester polyol / nano silicon dioxide hybrid material, isophorone diisocyanate 24~59 parts, 105~127 parts of polyether polyol, 3~8 parts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, octamethyl 32~48 parts of cyclotetrasiloxane, 0.03~0.05 parts of tetramethylammonium hydroxide, 25~30 parts of curing agent. The overall performance of the elastic body used for the under-rail block of rail transit provided by the present invention is significantly improved, which is very beneficial for being used as an under-rail block of rail transit; and, the preparation of the elastic body for the under-rail block of rail transit The method has simple operation, is suitable for large-scale industrial production, and thus has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of rail transit macromolecular materials, in particular to an elastomer used for rail transit under-rail pads and a preparation method thereof, and also relates to a production method for rail transit under-rail cushion blocks. Background technique [0002] In railway, high-speed railway, urban sleeper traffic and other sleeper structures, it is generally necessary to use elastic pads between the sleepers (such as steel rails or rails) and the sleepers to absorb the vibration energy generated by the passing of vehicles and reduce the noise caused by vibration. pollution, and to a certain extent protect the sleepers. [0003] It is worth noting that the rubber material corresponds to the use of different rail transit conditions. In general urban rail transit, the rubber pad can be used for passenger transport with a light axle load. However, with the rapid development of domestic rail transit, the rubber pad ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08K3/36
CPCC08G18/4238C08G18/4825C08G18/4829C08G18/4854C08G18/4018C08G18/3893C08G18/6618C08K3/36C08K2201/011
Inventor 韩亮杨科朱鼎李薇
Owner 上海鑫普新材料有限公司
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