Preparation method of TPEE (Thermoplastic Polyeher Ester Elastomer)/ polyether TPU (Thermoplastic Urethanes) alloy polymerizing cushion board

Abstract

The invention provides a preparation method of a TPEE (Thermoplastic Polyeher Ester Elastomer) / polyether TPU (Thermoplastic Urethanes) alloy polymerizing cushion board, and belongs to the technical field of railway accessories. The preparation method of the TPEE / polyether TPU alloy polymerizing cushion board aims at solving the problems such as service lives of existing cushion boards below rails and boards. The method comprises the steps of mixing raw materials, smelting, blending and pelletizing the mixed raw materials, drying polymer particles, performing injection molding through an injection molding machine, cutting off a water port, inspecting and testing, and warehousing a qualified product. According to the method, the prepared product is high in tensile strength, low in permanent compression set value, high in heat resistance, high in ageing resistance, high in cold resistance, high in fatigue resistance, and long in service life.

Description

technical field [0001] The invention belongs to the technical field of railway accessories, and relates to an under-rail and sub-board backing plate, in particular to a preparation method of a TPEE / TPU alloy polymerized backing plate. Background technique [0002] The under-rail and under-slab backing plate for railway track structure is an important part of the track structure. It is installed between the steel rail and the concrete sleeper. Electrically insulate the signal system. In addition, due to long-term exposure to the atmosphere under the rail and under the plate, it is required to have good natural aging resistance, cold resistance, heat resistance, and good shock absorption, stability, and low noise. . [0003] In the early stage of the development of under-rail and under-slab pads, rubber pads are mainly used, which are cheap and have good shock absorption performance. However, due to the large pollution in the production process of rubber pads, the aging perfo...

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Problems solved by technology

[0006] According to the characteristics of the above materials, the applicant has developed a thermoplastic polyester elastomer (TPEE) backing plate and applied for a patent for its production process [application number: 201410013398.2; authorized announcement number: CN103753754B], which is dried through raw materials, Injection molding, water cutting and inspection and testing can obtain TPEE pads, which have good resilience, high resistance to creep, impact and flexural fatigue, and good low temperature resistance. However, the applicant has long-term testing and use During the process, it was found that the toughness, tensile strength, resilience (reduced permanent deformation) and fatigue resistance of the TPEE backing plate were still not ideal, the use noise was large, and the service life was not long enough

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