Method for continuously preparing integral composite sleeper from controllable polyurethane composite material

Abstract

The invention discloses a method for continuously preparing an integral composite sleeper from a controllable polyurethane composite material. The sleeper is obtained by processing the controllable polyurethane composite material, continuous glass fibers, chopped glass fibers and a glass fiber mat, and comprises the following components in percentage by mass: 30%-40% of the controllable polyurethane composite material, 40%-60% of the continuous glass fibers, 5%-20% of the chopped glass fibers and 1%-10% of the glass fiber mat. The method can solve the problems that in the pultrusion and curing process of the polyurethane synthetic sleeper, a product is burnt and cracked, a product with a large cross section size cannot be pultruded, the size of the product cannot be switched at will, continuous automatic production cannot be achieved, the production efficiency is low, the performance of the product is defective due to the fact that early-stage foaming is fast and later-stage curing is slow in the curing and forming process, and an impregnation system cannot fully infiltrate fibers when the number of the fibers is large, it is guaranteed that product is not prone to cracking, the wettability of the polyurethane composite material and the glass fibers is better, and effective adjustment of the size of a mold cavity is achieved.

Description

technical field [0001] The invention belongs to the technical field of auxiliary components of railway public works engineering, and in particular relates to a method for continuously preparing integral composite sleepers with controllable polyurethane composite materials. Background technique [0002] Railway is currently one of the most important means of transportation in the world. With the development of railways towards high speed, heavy load and environmental protection, the requirements for tracks are getting higher and higher. As an important part of track, sleepers play an important role in track construction. play a vital role. [0003] At present, the sleepers used in my country's railway line engineering are mainly four kinds of wooden sleepers, steel sleepers, concrete sleepers and polyurethane composite sleepers. Among them, wooden sleepers, as sleepers commonly used in traditional railways, have the advantages of low cost, high elasticity, light weight, and ...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for continuously preparing integral composite sleepers with controllable polyurethane composite materials, so as to solve the problem of core burning and cracking of products during the pultrusion and curing of polyurethane synthetic sleepers. The product size can be switched at will, continuous automatic production is not possible, and the production efficiency is low. During the curing molding process, the early initiation is fast and the late curing is slow, which leads to defects in product performance. The impregnation system cannot fully infiltrate the fibers when the number of fibers is large. To ensure that the product is not easy to crack, so that the wettability of the polyurethane composite material and the glass fiber is better, so as to realize the effective adjustment of the cavity size

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