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Low dynamic and static stiffness ratio polyurethane microcellular elastomer composite material for urban rail and its preparation method

A microporous elastomer and polyurethane technology, applied in the field of polyurethane materials, can solve the problems of reduced passenger comfort, low service life of vibration damping pads, frequent loading of line capacity, etc., and achieves excellent shock absorption performance, low buffer stress, Molecular structure can be designed with strong effect

Active Publication Date: 2020-12-18
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the vibration reduction of high-speed rail lines, urban rail lines have the characteristics of frequent and generally heavy loads. The dynamic and static stiffness ratios of the above-mentioned disclosed material compositions are mostly between 1.26-1.30, and the dimensional change rate after 3 million fatigue tests is ≥13.5 , compared to the characteristics of high-speed rail, for low-speed and high-load urban rail lines, the dynamic and static stiffness ratio is required to be ≤ 1.20, the appearance is not damaged after 3 million fatigue tests, and the dimensional change rate is ≤ 10%, otherwise it will cause loud noise when the train is running, and passenger rides Decreased comfort, low service life of vibration-absorbing pads made of this material, short replacement cycle

Method used

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  • Low dynamic and static stiffness ratio polyurethane microcellular elastomer composite material for urban rail and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] Preparation of component A: weigh polyether polyol, chain extender, foam stabilizer, antioxidant and color paste into the reaction kettle, stir and heat, pump under the conditions of 100-120°C and -0.095MPa Vacuum dehydration and degassing for 45 minutes, lower the temperature to 60-80°C, add amine catalyst and foaming agent, continue to stir and vacuumize for 20-30 minutes, control the moisture content in the mixture at 0.1-0.5%, stop heating and stirring, and start filling .

[0040] Preparation of component B: Weigh the isocyanate and polyol into the reaction kettle, stir and heat, react at 80-90°C for 3-4h, stop heating and stirring and start filling.

Embodiment 1

[0043] Component A: Two polytetrahydrofuran diols with number average molecular weight of 1000-2000 and functionality of 2: 80%, chain extender 1,4-butanediol: 10%, chain extender trihydroxypropane: 6% , antioxidant 1010: 1%, amine catalyst triethylenediamine: 0.5%, foaming agent deionized water: 0.15%, silicone foam stabilizer: 2%, color paste: 0.35%; control the moisture in the mixture Content at 0.15%;

[0044] Component B: diphenylmethane diisocyanate: 35%, carbodiimide modified diphenylmethane diisocyanate: 5%, two kinds of polytetrahydrofuran diol with number average molecular weight of 1000-2000 and functionality of 2: 60%.

[0045] When in use, preheat components A and B to 40-45°C respectively, mix components A and B at a ratio of 1:0.75 using a low-pressure pouring machine; preheat the backing mold to 50-55 ℃, the above mixture is directly poured into the preheated backing mold, and cured in an oven at 50-55℃ for 8-10 minutes to form.

Embodiment 2

[0047] Component A: two polytetrahydrofuran diols with a number average molecular weight of 1000-2000 and a functionality of 2: 85%, chain extender 1,4-butanediol: 7%, chain extender trihydroxypropane: 4% , antioxidant 1010: 1%, amine catalyst triethylenediamine: 0.5%, foaming agent deionized water: 0.3%, silicone foam stabilizer: 2%, color paste: 0.2%; control the moisture in the mixture Content at 0.3%;

[0048] Component B: diphenylmethane diisocyanate: 47%, carbodiimide modified diphenylmethane diisocyanate: 3%, two kinds of polytetrahydrofuran diol with number average molecular weight of 1000-2000 and functionality of 2: 50%.

[0049] When in use, preheat components A and B to 40-45°C respectively, mix components A and B at a ratio of 1:0.95 using a low-pressure pouring machine; preheat the backing plate mold to 50-55 ℃, the above mixture is directly poured into the preheated backing mold, and cured in an oven at 50-55℃ for 8-10 minutes to form.

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Abstract

The invention provides a polyurethane micropore elastomer composite material of low spring rate ratio for urban rail and a preparation method thereof, and belongs to the field of polyurethane materials. The material has the excellent performance of high strength, wear resistance, flex resistance, low temperature resistance and oil resistance, chemical resistance and the like, and has the characteristics of low buffer stress, stable damping, short response time and the like. The polyurethane micropore elastomer composite material of low spring rate ratio for urban rail comprises a polyurethane main material, the polyurethane main material is prepared by mixing a component A and a component B, the component A is prepared by the following materials: 75-90% of polyether polyol, 8-18% of a chain extender, 0.5-1% of an anti-oxidant, 0.5-1% of an amine catalyst, 0.1-0.5% of a foaming agent, 1-4% of an organosilicon foam stabilizer, and 0.1-0.5% of color paste. The materials are uniformly mixed at 100-120 DEG C, the water content in the mixture is below 0.05%, and that is the component A; the component B is obtained by a reaction of 30-60% of isocyanate and 40-70% of polyol at 80-90 DEG C for 3-4 hours.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a polyurethane microporous elastomer composite material with low dynamic and static stiffness ratio for urban rail and a preparation method thereof. Background technique [0002] Since the large-scale laying of new under-rail foundations such as concrete sleepers, wide sleepers and integral ballast beds, the diseases caused by insufficient line elasticity have become more and more serious. With the vigorous development of urban rail transit in China, people have put forward higher requirements for rail damping pads. Impact and noise have become great technical problems in the development of urban rail. Traditional vibration damping pads generally use rubber materials, including natural rubber, neoprene, styrene-butadiene rubber, butadiene rubber, and the like. The rubber material contains more unsaturated chemical bonds, has low ozone aging resistance, and is easy to harde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08K5/134C08J9/08C08G101/00
CPCC08G18/3206C08G18/4808C08G18/4854C08G18/6677C08G2350/00C08K5/1345C08G2110/0083
Inventor 郑晖姜凌王黎明
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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