Special conductive adhesive for bonding of carbon contact strips used for pantographs of high-speed railways

Abstract

The invention discloses a special conductive adhesive for bonding of carbon contact strips used for pantographs of high-speed railways. The special conductive adhesive comprises a material A and a material B. The material A comprises amino epoxy resin, phenolic epoxy resin, liquid carboxylated nitrile rubber, silica micropowder and surface-silvered copper powder. The material B comprises ethylimidazole and fumed silica. The conductive adhesive provided by the invention adopts different kinds of temperature-resistant epoxy resin and gives play to the complementary effect of different groups, sothe adhesive achieves stable high-and-low-temperature performance and has high bonding strength after curing; mature epoxy curing agents on the market are selected and used, which is beneficial for maturation and stabilization of the produced conductive adhesive; the produced conductive adhesive has superior durability; a construction process for the conductive adhesive is simple, has low requirements on proportioning, can meet the requirements of small-batch and large-batch product at the same time, saves cost for manpower and material resources and improves the high-temperature bonding strength of the produced conductive adhesive; and the produced conductive adhesive has long storage life, can be stored at room temperature for no less than three years (wherein the storage life of products of the same kind is about a half year), and is wide in the range of curing time and ratio and simple to use.

Description

technical field [0001] The invention relates to the field of production of pantograph carbon slide plates, in particular to a conductive adhesive adhesive specially used for bonding high-speed rail pantograph carbon slide plates. Background technique [0002] With the increase of national high-speed railway trains, the demand for pantograph carbon skateboards of its electrified throat parts is gradually increasing. Pantograph carbon slides for high-speed rail have always been imported, and are now gradually realizing localization in response to national requirements. The production process of pantograph carbon skateboard mainly includes matching, bonding and grinding. The conductive adhesive used for bonding is a key material that affects product quality. The original electric locomotive pantograph carbon skateboard bonding glue can only adapt to the speed of the train at 80-120 km / h. With the increase of the speed of high-speed rail, the pantograph carbon slide plate put...

AI Technical Summary

Problems solved by technology

With the increase of the speed of high-speed rail, the pantograph carbon slide plate puts forward higher requirements for the selected adhesive. The existing high-temperature-resistant adhesives have low bonding strength at high temperatures, and some are too brittle at room temperature or low temperature. , is not conducive to use under severe conditions, some production process control requirements are high, raw materials are not easy to purchase, and the cost is high. It is difficult to form a stable product that can be marketed. Therefore, it is very useful to invent a special conductive adhesive for bonding high-speed rail pantograph carbon skateboards to solve the above problems. necessary