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Low-temperature-resistant medium-static-stiffness polyurethane microporous elastic base plate

A technology of microcellular elasticity and static stiffness, which is applied in the field of medium and static stiffness polyurethane microcellular elastic backing plates, can solve the problems of affecting the vibration reduction effect, decrease in elasticity, and high volume shrinkage rate of materials, so as to ensure the vibration reduction effect and increase the pressure. Effect

Active Publication Date: 2021-08-27
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's current high-performance polyurethane microporous elastic pads for urban rail passenger lines are almost entirely dependent on imports. This is mainly because the domestically developed polyurethane microporous elastic pads focus on the stiffness, dynamic and static stiffness ratio, and fatigue resistance of materials. Its cold resistance is difficult to meet the requirements, and the volume shrinkage rate of the material is high under low temperature conditions, resulting in a significant increase in stiffness and modulus and a decrease in elasticity, which seriously affects its vibration damping effect in low temperature environments and cannot effectively protect the receptors, thus limiting promotional use

Method used

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  • Low-temperature-resistant medium-static-stiffness polyurethane microporous elastic base plate
  • Low-temperature-resistant medium-static-stiffness polyurethane microporous elastic base plate
  • Low-temperature-resistant medium-static-stiffness polyurethane microporous elastic base plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 15 parts of PTMEG1000 (polytetrahydrofuran ether glycol with a functionality of 2 and a molecular weight of 1000), 51 parts of PTMEG2000 (polytetrahydrofuran ether glycol with a functionality of 2 and a molecular weight of 2000), 24.2 parts of EP330 (polytetrahydrofuran ether glycol with a functionality of 2, 3, polyoxypropylene triol with a molecular weight of 5000), 8.3 parts of BDO (1,4-butanediol), 0.31 parts of H 2 O, 1.03 parts of AK7703, 0.14 parts of BDMAE (bis(dimethylaminoethyl) ether) and 0.02 parts of T-12 (dibutyltin dilaurate) were mixed uniformly to obtain component A;

[0030]After mixing 50 parts of MDI (diphenylmethane diisocyanate), 30 parts of PTMEG1000 and 20 parts of PTMEG2000, under nitrogen protection atmosphere, stirred and reacted at 85°C for 4 hours to obtain component B with -NCO value of 13.39;

[0031] (2) According to the molar ratio of active -H in component A and -NCO group in component B: 1:1, component A preheated to 35°C and compo...

Embodiment 2

[0034] (1) 15 parts of PTMEG1000, 51 parts of PTMEG2000, 24.2 parts of EP330, 8.3 parts of BDO, 0.33 parts of H 2 O, 0.988 parts of AK7703, 0.16 parts of BDMAE and 0.022 parts of T-12 were mixed uniformly to obtain component A;

[0035] After mixing 50 parts of MDI, 30 parts of PTMEG1000 and 20 parts of PTMEG2000, under nitrogen protection atmosphere, stirred and reacted at 85°C for 4 hours to obtain component B with -NCO value of 13.39;

[0036] (2) According to the molar ratio of 1:1 molar ratio of active H in component A and -NCO group in component B, component A preheated to 35°C and component B preheated to 45°C were passed through two-component After the polyurethane pouring machine is mixed evenly, it is poured into a lockable mold preheated to 65°C, and the inner cavity volume is 868cm 3 Inject a mixture with a total mass of 434g into the mold, and then place the mold injected with the mixture at 65°C to cure for 10 minutes. After the mixture is expanded and molded, t...

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Abstract

The invention relates to a low-temperature-resistant medium-static-stiffness polyurethane microporous elastic base plate, and belongs to the technical field of polyurethane microporous elastomers. The elastic base plate is a polyurethane microporous elastic base plate which is obtained by curing and forming a component A and a component B, the density of the polyurethane microporous elastic base plate is 500-550 kg / m<3>, and the static rigidity of the polyurethane microporous elastic base plate is (15+ / -1.5) kN / mm under the loading of 1-35 kN, the component A is prepared by uniformly mixing PTMEG 1000, PTMEG 2000, EP330, BDO, H2O, AK7703, BDMAE and T12, and the component B is a prepolymer which is formed by stirring and reacting a compound containing -NCO groups and polytetrahydrofuran ether polyol at the temperature of 80-100 DEG C for 4-6 h and has the NCO value of 12-15. By optimizing the raw material components and the component content in the elastic base plate and properly increasing the pressure in micropores in the elastic backing plate, the elastic base plate has good cold resistance on the premise of meeting the use requirements of other indexes such as static rigidity, dynamic and static rigidity ratio and the like; therefore, the medium-static-stiffness polyurethane microporous elastic base plate for the urban railway passenger transport line, which meets various index requirements, is obtained.

Description

technical field [0001] The invention relates to a low-temperature-resistant polyurethane microporous elastic backing plate with medium static stiffness, belonging to the technical field of polyurethane microporous elastomers. Background technique [0002] Polyurethane microporous elastic pads of a certain shape and size prepared by molds have excellent mechanical mechanics, wear resistance, fatigue resistance, water resistance, high insulation and light weight, and have gradually been popularized and applied in the field of rail transit. Among them, the elastic backing plate used for urban rail passenger transport lines has different requirements for the static stiffness of the elastic backing plate according to the actual pressure of the specific application site. Under the load of 1kN-35kN, the static stiffness is mainly divided into (23±2.3)kN / mm, (15±1.5)kN / mm and (8±0.8)kN / mm three categories. The elastic backing plates used for urban rail passenger lines with differe...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08G18/16C08G18/24C08G18/48C08G18/32C08J9/08C08G101/00
CPCC08G18/6674C08G18/4812C08G18/4854C08G18/4829C08G18/12C08G18/168C08G18/246C08G2110/0083C08G18/3206
Inventor 邹美帅张旭东于学俊甄茂民吴晓霞张旭峰夏义兵吴敬朋李晓东
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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