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

A microcellular elasticity and ultra-high strength technology, applied in the field of microcellular polyurethane, can solve problems such as increased stiffness, low mechanical properties, and inability to meet vibration reduction requirements.

Active Publication Date: 2022-04-05
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

However, the mechanical properties of polyurethane microcellular elastic pads currently used in rail transit are generally not high. Although the strength of polyurethane microcellular elastomers can be effectively improved by increasing the density and chemical crosslinking degree, at the same time, its stiffness will also increase correspondingly, which cannot meet the heavy requirements. Vibration reduction requirements for special sections of loaded railways under high load conditions

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (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:

[0035]

[0036] The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0037] Mix the above raw materials evenly to obtain component A;

[0038] 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:

[0039] MDI 50%;

[0040] PTMEG1000 50%;

[0041] 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;

[0042] (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

[0045] (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:

[0046]

[0047]

[0048] The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0049] Mix the above raw materials evenly to obtain component A;

[0050] 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:

[0051] MDI 50%;

[0052] PTMEG1000 50%;

[0053] 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;

[0054](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

[0057] (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:

[0058]

[0059] The diameter of carbon nanotubes is 10-20nm, and the length is 5-15μm;

[0060] Mix the above raw materials evenly to obtain component A;

[0061] 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:

[0062] MDI 50%;

[0063] PTMEG1000 50%;

[0064] 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;

[0065] (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 ultrahigh 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 by uniformly mixing PTMEG (polytetramethylene ether glycol) 1000, PTMEG 2000, BDO (butanediol), DEA (diethylene glycol), 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). The polyurethane microporous elastic base plate has ultrahigh strength, proper static stiffness and lower ratio of dynamic stiffness to static stiffness, and can meet the use requirements of elastic base plates on special sections of heavy haul railways.

Description

technical field [0001] The invention relates to a polyurethane microporous elastic backing plate with ultra-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 vibration damping 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 track structure of heavy-duty railways, especially some special road sections such as corners, is subject to increasing loads, and rubber pads are crushed, worn and easily aging, resulting in performance degradation. It has become increasingly prominent and has constituted a serious threat to the safety of truck transportation. In view of the above-mentioned problems, it is of great significance to invent a product ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08K3/04C08G101/00
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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