Polyurethane sleeper and preparation method thereof

A technology of polyurethane and foamed polyurethane is applied in the field of rail sleepers and their preparation, which can solve the problems of difficulty in forming polyurethane foam and achieve the effects of low cost, improved mechanical properties and good corrosion resistance.

Active Publication Date: 2014-01-08
上海橡胶制品研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molding of cast polyurethane foam reinforced with long fibers is relatively difficult.

Method used

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  • Polyurethane sleeper and preparation method thereof
  • Polyurethane sleeper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] see figure 1 with figure 2 , figure 1 is the structural schematic diagram of the polyurethane sleeper, figure 2 Schematic diagram of the custom-made PVC frame used to manufacture the polyurethane sleeper. The numbers in the figure are: 1—polyurethane closed-cell foam; 2—long glass fiber roving; 3—end plates with threading holes at both ends of the frame; 4—threading holes.

[0020] figure 2 The PVC frame shown has a wall thickness of 5mm, and the inner wall dimensions: length is 1000mm, width is 130mm, and height is 260mm. The end plates 3 at both ends of the PVC frame are provided with threading holes 4, the diameter of the threading holes is 2mm, and the distance between the outermost threading holes and the edge is 5mm, and the holes are evenly spaced and arranged neatly. The number of threading holes on the single end of the PVC frame is 20×40, a total of 800, and the total length of glass fiber required to thread a PVC frame is about 850m. The glass fiber ...

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Abstract

The invention discloses a sleeper prepared from a long glass fiber and hard foam polyurethane composite material, and a preparation method for the sleeper. A polyurethane raw material is a hard foam polyurethane material in a batch number of GEO12488 produced by Huntsman, and glass fibers are twistless long thick yarns special for reinforcing polyurethane, which are produced by Jushi Group of Tongxiang. A preparation process for the sleeper comprises the following steps of: threading the glass fibers to fix the glass fibers in a special perforated polyvinyl chloride (PVC) frame; casting the pre-mixed foam polyurethane material; and feeding into a steel die for shaping. The prepared sleeper has a good vibration damping effect, good mechanical properties and long service life and can be widely applied to high-speed railway tracks.

Description

technical field [0001] The invention relates to a rail sleeper in rail transit facilities and a preparation method thereof, in particular to a sleeper made of long glass fiber and rigid foamed polyurethane composite material and a preparation method thereof. Background technique [0002] For a long time, the sleepers used in laying railroad tracks have used specific wood. With the progress of society, high-speed railways and urban rail transit have also been greatly developed. Whether it is a fast passenger train or a heavy-duty freight train, the technical requirements for sleepers are different. is constantly improving. Nowadays, sleepers used for railway tracks must be able to withstand high mechanical loads, and at the same time require dimensional stability and weather resistance over a long period of time, so as to meet the needs of safe operation and low maintenance costs of railways. [0003] Wooden sleepers are exposed to the outdoor atmospheric environment and are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L75/08C08K7/14B29C45/00E01B3/44
Inventor 戎玥玥沈娟
Owner 上海橡胶制品研究所有限公司
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