Microporous polyurethane elastomer shock absorption element for high-speed railway and preparation method thereof

Abstract

The invention discloses a microporous polyurethane elastomer shock absorption element for a high-speed railway. The shock absorption element is characterized by being prepared by stirring and mixing a mixture I and a quasi-prepolymer II at the temperature of between 35 and 55 DEG C for 2 to 5 minutes to obtain a mixture, wherein the mixture I consists of the following components in part by weight: 23 to 40 parts of polyether polyol A, 5 to 10 parts of chain extender, 0.1 to 0.5 part of water, 0.2 to 0.55 part of silicone oil foam homogenizing agent and 0.15 to 0.3 part of catalyst, and the quasi-prepolymer II is prepared by reacting 2.5 to 8 parts of modified nanokaolin, 24 to 30 parts of polyether glycol and 30 to 40 parts of polyisocyanate; pouring the mixture into a die which is pre-heated to 45 to 70 DEG C and is coated with a de-molding agent for molding, de-molding, and curing at the temperature of between 80 and 100 DEG C for 10 to 20 hours. The indexes of the shock absorption element meet the requirements of the HE / 3328-2006 standard.

Description

1. Technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a microporous polyurethane elastomer damping element for high-speed railways and a preparation method thereof. 2. Background technology [0002] Microcellular polyurethane elastomer is a new type of material between foam and elastomer. The density is between foam and solid core materials. The pore size of the cells is 0.1-10 μm. The pore size distribution is relatively uniform, taking into account the light weight of the foam. , good impact resistance, good energy absorption, cushioning performance, high strength of elastomer, good wear resistance, good mechanical properties of elastomer and comfort of foam, light unit weight, wear resistance, oil resistance It has the characteristics of smooth transmission of vibration damping compression stress, excellent mechanical properties of fatigue resistance and so on. Microporous polyurethane elastome...

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Problems solved by technology

[0004] Chinese patent CN101486834A uses organic montmorillonite to strengthen polyurethane microcellular elastomer, and the effect is more obvious, but it has adopted 1,1-dichloro-1-fluoroethane (F-141b) as physical foaming agent, this hair The foaming agent has a destructive effect on the ozone layer, so it should not be used

Chinese patent CN1185501A uses 10% to 60% of ordinary mineral clay to reinforce polyurethane elastomer sleeper backing plates for railways. The weight of the elastomer increases a lot, and it adopts a one-step pouring and curing process, and then granulates and then extruded. The disadvantage of this method is that the soft and hard segments and clay are easy to be unevenly distributed, resulting in defects in the elastic body, and the backing plate is solid, so the shock absorption effect is poor

Chinese patent CN100513451C uses inert gas to fill the composition containing prepolymer, polyol and chain extender to prepare foamy raw materials, and then injects them into molds for solidification and molding to prepare polyurethane foam backing plates for railways. Although the pore size of the foam body is small, the cost of foaming with inert gas is relatively high

Chinese patent CN101381442A discloses a manufacturing method of TODI-based polyurethane microporous elastomer. Good dynamic properties can be obtained by using TODI, but polyadipate is used as the soft segment of polyol, which is used as the water-resistant material for shock-absorbing materials. Poor performance, not up to the requirements for high-speed rail

Chinese patent CN101519485 discloses a polyurethane microporous elastomer material for damping and vibration reduction in a wide temperature range and its preparation method. The strength and elongation at break are not high, which cannot meet the requirements for high-speed rail

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