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A kind of inter-embedded phenolic resin composite sleeper and its preparation method

A phenolic resin and composite sleeper technology, which is applied in the direction of tracks, ballast layers, buildings, etc., can solve the problems of large vibration acceleration of rails and sleepers, insufficient lateral strength of sleepers, and high line noise, etc., to reduce noise and water quality, improve fiber Layout, cost and density reduction effects

Active Publication Date: 2020-10-13
QINGDAO HILYWILL ADVANCED MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, elastic sleepers still have problems such as insufficient sleeper transverse strength, high vibration acceleration of rails and sleepers, unstable ballast bed, and large line noise.

Method used

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  • A kind of inter-embedded phenolic resin composite sleeper and its preparation method
  • A kind of inter-embedded phenolic resin composite sleeper and its preparation method
  • A kind of inter-embedded phenolic resin composite sleeper and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Fiber pretreatment: 1) soak the glass fiber in alkali solution with a pH value of 12 for 1 hour; 2) wash and dry, soak in 5wt% chitosan aqueous solution for 1 hour, wash and dry to obtain the modified fiber.

[0039] The embedded composite sleeper is made by bonding up and down. The sleeper body is provided with a uniform unidirectional fiber layer on the cross section. The fitting structure is a right-angled trapezoid, and the embedding depth is 20mm. The phenolic foam density contained in the sleeper body is 0.5g / cm 3 The fiber diameter in the sleeper is 10 μm; the glass fiber content in the sleeper is 50wt%. In the phenolic resin, the polyether polyol with a molecular weight of 400 is added, and the mass ratio of the phenolic resin to the polyol is 100: 5; the foaming agent in the resin is an organic ether; decabromodiphenylethane is used as a flame retardant, and the phenolic resin The mass ratio of the flame retardant to the flame retardant is 100:5; the width of...

Embodiment 2

[0048] The embedded composite sleeper is made by bonding the left and right sides, and the sleeper body is provided with a uniform unidirectional fiber layer on the cross section. The fitting structure is trapezoidal, and the embedding depth is 30mm. The phenolic foam density contained in the sleeper body is 0.3g / cm 3; The fiber diameter in the sleeper is 10μm; The content of the aramid fiber in the sleeper is 50wt%. A polyether polyol with a molecular weight of 400 is added to the phenolic resin, and the mass ratio of the phenolic resin to the polyol is 100: 15; the foaming agent in the resin is ammonium bicarbonate; the width of the end face of the sleeper is 240mm, the height is 200mm, and the length is 3000mm.

[0049] The preparation process is the same as in Example 1.

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Abstract

A mutually-embedded phenolic resin composite sleeper, comprising: an embedded sleeper body made of a foamed phenolic resin, the sleeper body being internally provided with a uniform or pre-designed non-uniform unidirectional fiber layer on the cross section. Two portions of the sleeper body which form a mutually-embedded structure are bonded together by an adhesive to form the composite sleeper. The mutually-embedded structure is one of a right-angled trapezoid, a trapezoid, and a triangle, preferably the right-angled trapezoid. The composite sleeper uses an embedding technology, and improves a foaming process and a fiber arrangement mode, thereby increasing the lateral strength of the sleeper by more than 50%, and reducing the noise level of the sleeper; and the mechanical strength of the sleeper is effectively improved and the life of the sleeper is prolonged.

Description

technical field [0001] The invention relates to a phenolic resin composite sleeper and a preparation method thereof, belonging to the field of railway track materials. Background technique [0002] Early sleepers were made of wood, which had the disadvantages of perishability and high maintenance costs, and were gradually replaced by cement sleepers on a large scale. However, cement sleepers have the disadvantages of high rigidity and large vibration during train operation. With the development of material science With the progress, polymer composite sleepers have appeared, among which polyurethane elastic sleepers are the most widely used at present. Polyurethane elastic sleeper is a structural material made of rigid polyurethane foaming resin with fiber yarn added and pultruded. It has corrosion resistance, good insulation, high strength, light weight similar to wood, and can be reprocessed performance. The earliest polyurethane sleeper was developed by Japan's Sekisui C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B3/44C08L61/06C08L71/00C08K9/04C08K7/14C08K5/03C08J9/14C08J9/08
CPCC08J9/08C08J9/141C08J2203/02C08J2203/14C08J2361/06C08J2471/00C08K5/03C08K7/14C08K9/08E01B3/44
Inventor 张万明李卫中胡娅婷
Owner QINGDAO HILYWILL ADVANCED MATERIALS TECH