High-performance polyurethane synthesizing sleeper and preparation method thereof

A polyurethane and high-performance technology, which is applied in the field of high-performance polyurethane synthetic sleepers and its preparation, can solve the problems of low transverse shear force, high brittleness, and large internal voids, etc., so as to improve product stability and fatigue resistance Performance, well-mixed and homogeneous results

Pending Publication Date: 2018-07-13
瑞尔华(上海)交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wooden sleepers are directly processed from wood, which is the earliest material used. Due to the excellent characteristics of wood itself, it is an ideal material for sleepers, but it is easy to weather and crack, has poor corrosion resistance, short service life, and wood consumption. Large, with the improvement of people's awareness of environmental protection and the impact of the lack of forest resources in our country, wooden sleepers are becoming more and more difficult to meet the needs of railways
Steel concrete sleepers are developed to make up for the shortcomings of wooden sleepers and have been widely promoted and applied. They have the advantages of easy availability of raw materials, long service life, high stability, and low maintenance. However, steel concrete sleepers also have unsolvable shortcomings: Cracks appear after a period of use, with high hardness, poor elasticity, heavy weight, high brittleness, and poor damping and vibration reduction effect
However, the sleeper obtained by this preparation method is prone to misalignment between the plates during actual use, thus causing serious safety hazards
[0006] In addition, in the current production, the damping effect of the produced sleeper is not obvious, the transverse shear force is low, and the resistance to Poor fatigue, unstable density and quality of the product, leading to defects of cracks and large internal voids in sleepers

Method used

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  • High-performance polyurethane synthesizing sleeper and preparation method thereof
  • High-performance polyurethane synthesizing sleeper and preparation method thereof
  • High-performance polyurethane synthesizing sleeper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A high-performance polyurethane synthetic sleeper, the sleeper uses glass fiber as the skeleton, and the glass fiber is impregnated in foamed polyurethane to obtain the foamed base material of the sleeper. After further processing, the sleeper is obtained. The foamed polyurethane comprises the following parts by weight Component: 60 parts of polyether polyol A, 10 parts of polyether polyol B, 40 parts of polyester polyol, 10 parts of flame retardant, 0.2 part of accelerator, 0.1 part of antioxidant, 0.1 part of ultraviolet absorber, foam 1 part of stabilizer, 0.3 part of nanometer cellulose, 92 parts of isocyanate. The hydroxyl value of the polyether polyol A is 410-480, and the molecular weight is 3000-4000; the hydroxyl value of the polyether polyol B is 40-80, and the molecular weight is 1200-1500; The hydroxyl value of the ester polyol is 410-550, and the molecular weight is 4000-5000. The nanometer cellulose has a diameter of 1-50 nm, and includes glass fiber, carb...

Embodiment 2

[0039] The synthetic sleeper blank product B for urban rail transit is produced according to the formula and process of the present invention.

[0040] In parts by mass, the formula of polyurethane resin and the ratio of polyurethane resin to reinforcing fiber are as follows: polyether polyol A 51 parts, polyether polyol B 20 parts, polyester polyol 60 parts, flame retardant 15 parts, accelerator 0.4 Parts, 0.3 parts of antioxidants, 0.3 parts of ultraviolet absorbers, 3 parts of foam stabilizers, 0.5 parts of nano-sized cellulose, 100 parts of isocyanate. The hydroxyl value of the polyether polyol A is 410-480, and the molecular weight is 3000-4000; the hydroxyl value of the polyether polyol B is 40-80, and the molecular weight is 1200-1500; The hydroxyl value of the ester polyol is 410-550, and the molecular weight is 4000-5000. The diameter of the nanometer fiber is 1-50nm, including glass fiber, carbon fiber and aramid fiber. The glass fiber used as the skeleton is a high-d...

Embodiment 3

[0049] A synthetic sleeper blank C for heavy-duty railways manufactured according to the formula and forming process of the present invention.

[0050] In parts by mass, the formula of polyurethane resin and the ratio of polyurethane resin to reinforcing fiber are as follows: polyether polyol A 55 parts, polyether polyol B 15 parts, polyester polyol 36 parts, flame retardant 12 parts, accelerator 0.3 Parts, 0.2 part of antioxidant, 0.2 part of ultraviolet absorber, 2 part of foam stabilizer, 0.4 part of nano-sized cellulose, 96 part of isocyanate. The hydroxyl value of the polyether polyol A is 410-480, and the molecular weight is 3000-4000; the hydroxyl value of the polyether polyol B is 40-80, and the molecular weight is 1200-1500; The hydroxyl value of the ester polyol is 410-550, and the molecular weight is 4000-5000. The nanometer cellulose has a diameter of 1-50 nm, and includes glass fiber, carbon fiber, and aramid fiber. The glass fiber used as the skeleton is a high-de...

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Abstract

The invention relates to a high-performance polyurethane synthesizing sleeper and a preparation method thereof. The high-performance polyurethane synthesizing sleeper is obtained by using glass fiberas a framework, impregnating the glass fiber into foamed polyurethane to obtain a sleeper foamed base material, and further processing, wherein the foamed polyurethane comprises the following components in parts by weight: 50-60 parts of polyether polyol A, 10-20 parts of polyether polyol B, 30-40 parts of polyester polyol, 10-15 parts of a flame retardant, 0.2-0.4 part of an accelerator, 0.1-0.3part of an antioxidant, 0.1-0.3 part of an ultraviolet absorbent, 1-3 parts of a foam stabilizer, 0.3-0.5 part of nanoscale cellulose and 92-100 parts of isocyanate. Compared with the prior art, the high-performance polyurethane synthesizing sleeper provided by the invention has the advantages as follows: a product is moulded at one time, the obtained sleeper has excellent mechanical properties and high stability and the like.

Description

Technical field [0001] The invention relates to the technical field of composite materials, in particular to a high-performance polyurethane synthetic sleeper and a preparation method thereof. Background technique [0002] Sleeper is a kind of railway accessories. Its main function is to evenly spread the load, lateral force and longitudinal horizontal force from the rail on the track bed. It is an indispensable material in the field of railway construction and load-bearing equipment. It plays a role in railway construction. Crucial role. [0003] At present, there are mainly two types of sleepers in my country: reinforced concrete sleepers and wooden sleepers. Wooden sleepers are directly processed from wood and are the first material used. Due to the excellent characteristics of wood, it is an ideal material for sleepers, but it is easy to weather and crack, has poor corrosion resistance, short service life, and wood consumption. With the improvement of people’s awareness of env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/42C08K7/14B29C70/52B29C70/54C08G101/00
CPCC08G18/4018C08G18/42C08G18/4804C08K7/14B29C70/52B29C70/525B29C70/545C08G2101/00
Inventor 赵淳蔡斌王晨
Owner 瑞尔华(上海)交通科技有限公司
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