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A technology of microporous elasticity and static stiffness, applied in the direction of rails, buildings, fixed rails, etc., can solve the problems of affecting the vibration reduction effect, decrease in elasticity, and difficult to meet the requirements of cold resistance, so as to ensure the vibration reduction effect and increase the pressure. Effect
Active Publication Date: 2021-10-01
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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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
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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), 23.9 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), 0.37 parts of H 2 O, 1.239 parts of AK7703, 0.17 parts of BDMAE (bis(dimethylaminoethyl) ether) and 0.021 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 com...
Embodiment 2
[0034] (1) 15 parts of PTMEG1000, 51 parts of PTMEG2000, 23.8 parts of EP330, 8.3 parts of BDO, 0.39 parts of H 2 O, 1.307 parts of AK7703, 0.18 parts of BDMAE and 0.023 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 active -H in component A and -NCO group in component B: 1:1, component A preheated to 35°C and component B preheated to 45°C were passed through two groups After mixing evenly with a polyurethane pouring machine, pour it into a lockable mold preheated to 65°C, with an inner cavity volume of 868cm 3 A mixture with a total mass of 347.2g was injected into the mold, and then the mold injected with the mixture was cured at 65°C for 10 minutes. After the mixture was expanded and molded, the mold was fil...
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Abstract
The invention relates to a low-static-stiffness polyurethane microporous elastic backing plate with a low low-temperature static stiffness change rate, 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 400-450 kg/m<3>, and the static rigidity of the polyurethane microporous elastic base plate is (8 +/-0.8) 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 base 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 low-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 polyurethane microporous elastic backing plate with low static stiffness and low static stiffness change rate at low temperature, which belongs 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 ra...
Claims
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