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High-strength low-dynamic-static-stiffness-ratio polyurethane microporous elastic backing plate and preparation method thereof

A technology of microcellular elasticity and stiffness ratio, which is applied in the field of microcellular polyurethane, can solve the problems of low suitable stiffness, loss of vibration damping effect, and difficulty in meeting the high strength of under-rail vibration damping pads, so as to improve strength and improve tensile strength. the effect of strength

Active Publication Date: 2022-04-12
山东奥卓新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a strong hydrogen bond between the soft segment and the hard segment of the polyurethane microcellular elastomer. The more hydrogen bonds, the stronger the intermolecular force, which can effectively improve the strength of the polyurethane microcellular elastomer, but at the same time its stiffness will also decrease. Correspondingly, if the stiffness is too high, the polyurethane microcellular elastomer will lose its vibration damping effect, and it is difficult to meet the requirements of high strength, suitable stiffness and low dynamic and static stiffness ratio of the under-rail vibration damping pad in the ordinary section of heavy-duty railway

Method used

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  • High-strength low-dynamic-static-stiffness-ratio polyurethane microporous elastic backing plate and preparation method thereof
  • High-strength low-dynamic-static-stiffness-ratio polyurethane microporous elastic backing plate and preparation method thereof
  • High-strength low-dynamic-static-stiffness-ratio polyurethane microporous elastic backing plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Taking the total mass of raw materials for preparing the A component as 100%, each raw material composition and its mass fraction are as follows:

[0040]

[0041] The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0042] Mix the above raw materials evenly to obtain component A;

[0043] Based on the total mass of the raw materials for preparing the B component as 100%, the raw material components and their mass fractions are as follows:

[0044] MDI 50%;

[0045] PTMEG1000 50%;

[0046] After mixing the above raw materials, under a nitrogen protective atmosphere, stir and react at 85°C for 4 hours to obtain component B with an -NCO value of 12.56;

[0047] (2) According to the molar ratio of active -H in component A and -NCO group in component B being 1:1, component A preheated to 35°C and component B preheated to 45°C were double- After the components are mixed evenly by the polyurethane pouring machine, they are poured into a lockable...

Embodiment 2

[0051] (1) Taking the total mass of raw materials for preparing the A component as 100%, each raw material composition and its mass fraction are as follows:

[0052]

[0053]

[0054]The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0055] Mix the above raw materials evenly to obtain component A;

[0056] Based on the total mass of the raw materials for preparing the B component as 100%, the raw material components and their mass fractions are as follows:

[0057] MDI 50%;

[0058] PTMEG1000 50%;

[0059] After mixing the above raw materials, under a nitrogen protective atmosphere, stir and react at 85°C for 4 hours to obtain component B with an -NCO value of 12.56;

[0060] (2) According to the molar ratio of active -H in component A and -NCO group in component B being 1:1, component A preheated to 35°C and component B preheated to 45°C were double- After the components are mixed evenly by the polyurethane pouring machine, they are poured into...

Embodiment 3

[0064] (1) Taking the total mass of raw materials for preparing the A component as 100%, each raw material composition and its mass fraction are as follows:

[0065]

[0066] The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0067] Mix the above raw materials evenly to obtain component A;

[0068] Based on the total mass of the raw materials for preparing the B component as 100%, the raw material components and their mass fractions are as follows:

[0069] MDI 50%;

[0070] PTMEG1000 50%;

[0071] After mixing the above raw materials, under a nitrogen protective atmosphere, stir and react at 85°C for 4 hours to obtain component B with an -NCO value of 12.56;

[0072] (2) According to the molar ratio of active -H in component A and -NCO group in component B being 1:1, component A preheated to 35°C and component B preheated to 45°C were double- After the components are mixed evenly by the polyurethane pouring machine, they are poured into a lockable...

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Abstract

The invention relates to a polyurethane microporous elastic backing plate with high strength and low dynamic and static stiffness ratio, and belongs to the technical field of microporous polyurethane. The elastic backing plate is obtained by curing and molding a component A and a component B; the component A is prepared from PTMEG (polytetramethylene ether glycol) 1000, BDO (butanediol), H2O, AK7703, BDMAE (butanediol), T12 and a carbon nano tube; the component B is a prepolymer with the-NCO value of 12-14, which is formed by stirring and reacting isocyanate and polytetrahydrofuran ether polyol for 4-6 hours at the temperature of 80-100 DEG C in a protective gas atmosphere; the molar ratio of the active-H contained in the component A to the-NCO group contained in the component B is (1.00: 0.98)-(1.00: 1.03). According to the method, the component A and the component B are preheated and then poured, cured and formed. The polyurethane microporous elastic base plate has higher strength, proper static rigidity and lower ratio of dynamic rigidity to static rigidity, and can meet the use requirements of common road sections of heavy haul railways on the elastic base plate.

Description

technical field [0001] The invention relates to a polyurethane microporous elastic backing plate with high strength and low dynamic and static stiffness ratio and a preparation method thereof, belonging to the technical field of microporous polyurethane. Background technique [0002] In heavy-haul railways, under-rail rubber pads are elastic components commonly used in track structures, which play an important role in reducing vibration and noise. With the increase of the axle load of heavy-duty trucks and the improvement of operating speed, the load on the track structure of heavy-duty railways continues to increase, and the problems of performance degradation caused by rubber pad crushing, wear and aging are becoming more and more prominent. Security has posed a serious threat. In view of the above-mentioned problems, it is of great significance to invent a product with excellent vibration damping performance and long service life to prolong the service life of track comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08K3/04C08G101/00
CPCY02E60/10
Inventor 张旭东吴敬朋甄茂民夏义兵朱瑞汪军冯笑王传奇庞麒麟彭鹏程林敬
Owner 山东奥卓新材料有限公司
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