Special modified thermoset ultrahigh-molecular epoxy resin electric-strip fastener baffle seat for railway track

Abstract

The invention relates to a special modified thermoset ultrahigh-molecular epoxy resin electric-strip fastener baffle seat for a railway track, which is high in corrosion resistance and weather resistance as well as intensity, and can achieve performance like that of low carbon steel (such as a Q235 steel workpiece the intensity of which can meet the requirement stated in GB / T700-1988Q235). The baffle seat comprises the following raw materials in percentage by weight: 12% to 18% of modified thermoset epoxy resin, 4% to 6% of hyperbranched curing cross-linking agent, 60% to 86% of fibrous reinforcing materials and 5.5% to 8.5% of power reinforced material additives. The baffle seat provided by the invention has the advantages that a molecular structure contains not only a great amount of flexible segments for relieving crisp and rigidity of the epoxy resin, but also end-capped epoxy groups which can participate in curing reaction, so that a toughening effect is obvious, the bonding strength of a system is improved, and the compression strength and the shearing strength of the materials are improved greatly.

Description

technical field [0001] The invention relates to a modified thermosetting ultra-high polymer epoxy resin specially used for railways, which has good corrosion resistance, good weather resistance, high strength, and performance that can reach low-carbon steel (such as the strength requirements of Q235 steel workpieces specified in GB / T700-1988 Q235). The utility model relates to a baffle plate seat of an elastic strip type fastener, which belongs to the field of manufacturing modified polymer plates. Background technique [0002] At present, the raw materials used for the baffle seats of type I and II railway clips are metal carbon steel, nylon 6 (polyamide 6) and modified nylon 66 (modified polyamide 66). Not resistant to rust, rusted workpieces quickly lose their proper performance; nylon 6 baffle seat and modified nylon 66 due to their structural characteristics (anti-fatigue strength loss and low temperature difference, etc.) Embrittlement generally occurs in arid areas, ...

AI Technical Summary

Problems solved by technology

Due to the chain molecular structure of thermoplastic resin, many molecular chains are combined together by physical action. Due to the limitation of its process, the amount of residual low molecular solvent in the drying process cannot be guaranteed to overflow completely. The arrangement is not uniform, and the residual solvent cannot escape completely, resulting in uneven strength per unit area. There are bubbles in it, which cannot guarantee the consistency of material strength and quality, making this composite material unable to be used in some special high-demand products such as rail fasteners. , automotive gearboxes, pressure vessels, ship plates, armor protection, etc. to replace existing metal materials

[0004] The epoxy resin hand lay-up process currently used for composite materials, due to the backward process, the resin content cannot be accurately controlled, and the quality cannot be guaranteed. In addition, it uses ordinary epoxy resin and curing crosslinking agent, which cannot meet the requirements of replacing metal materials. strength requirements