Low-thermal-expansion-coefficient type waste plastic composite sleeper

Abstract

The invention provides a low-thermal-expansion-coefficient type waste plastic composite sleeper. The low-thermal-expansion-coefficient type waste plastic composite sleeper comprises 100 parts of baseresin, 35-55 parts of a thermal expansion coefficient modifier, 5-10 parts of a compatilizer, 30-60 parts of a flame retardant, 45-70 parts of a reinforcing filler, 0-1 part of an anti-ultraviolet additive, 0-2 parts of an antioxidant, 1.0-2.5 parts of a coupling agent, 0-3 parts of a lubricant and 0-4 parts of a foaming agent. The invention provides a method for overcoming the defects that thermoplastic resin is large in molding shrinkage, large in thermal expansion coefficient and the like, and the prepared plastic sleeper is low in thermal expansion coefficient. A large amount of waste plastic is used, so that the problems of white pollution and energy are solved to a certain extent, and meanwhile, the environment is protected; the thermal expansion modifier is utilized to lower the thermal expansion coefficient of the plastic composite sleeper, improve the molding shrinkage of the plastic sleeper and widen the application range of the plastic sleeper under harsh temperature environment conditions. The method is not harsh in process conditions, simple in steps and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of rail transit composite materials, and in particular relates to a low thermal expansion coefficient type waste plastic synthetic sleeper. Background technique [0002] The sleepers used in railway lines include wooden sleepers, concrete sleepers, and glass fiber reinforced polyurethane composite sleepers. At present, forest resources are scarce in the world. At the same time, wooden sleepers are prone to aging, short life, and frequent replacement; concrete sleepers are heavy, poor in elasticity, high in quality, and low in construction efficiency when replacing them; polyurethane synthetic sleepers are expensive and limited in application. The waste plastic sleeper is made of recyclable HDPE plastic, which is energy-saving and environmentally friendly. At the same time, the plastic sleeper has the advantages of good elasticity, corrosion resistance and aging resistance. [0003] U.S. Patent No. 5,789,477...

AI Technical Summary

Problems solved by technology

[0006] However, the thermal expansion coefficient of the synthetic sleeper in the prior art is relatively high, especially under severe temperature conditions, it is easy to expand and deform when heated, which affects the service life of the sleeper

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