Dipping liquid used for dipping glass fiber twistless roving at external layer of steel rail polishing grinding wheel, and its preparation method

Abstract

The invention discloses a dipping liquid used for dipping a glass fiber twistless roving at the external layer of a steel rail polishing grinding wheel, and its preparation method. The dipping liquid has a very high bonding ability and has a high wettability to the glass fiber twistless roving, so the glass fiber twistless roving enables a winding layer to be firmly bonded with the body of the grinding wheel when the glass fiber twistless roving subjected to the dipping in the dipping liquid is wound on the outer circumferential surface of the grinding wheel body, the winding layer does not shred after long-term use, the strength of the grinding wheel is substantially enhanced, and the winding layer can protect the grinding wheel body during the whole service life period, thereby the service life of the grinding wheel is prolonged.

Description

technical field [0001] The invention relates to an impregnating liquid and a preparation method thereof, in particular to an impregnating liquid for impregnating the outer glass fiber roving of a rail grinding wheel and a preparation method thereof. Background technique [0002] The rail grinding wheel is a special grinding wheel that uses the end face of the grinding wheel to grind the surface of the rail. Due to the instability of grinding conditions, in order to prevent the grinding wheel from being broken due to grinding impact, a glass fiber winding layer is often added to the outer circumference of the grinding wheel. In the prior art, epoxy resin is often dissolved in acetone or toluene solvent to make impregnating resin, and then the impregnating resin is applied layer by layer when winding glass fiber roving, so as to combine the entire glass fiber winding layer. The impregnating liquid in the prior art has the following two defects: on the one hand, the degree of ...

AI Technical Summary

Problems solved by technology

The impregnating liquid in the prior art has the following two defects: on the one hand, the degree of cohesion of the impregnating liquid is not high, resulting in the roving not being firmly bonded to each other. Usually, in the second half of the service life of the grinding wheel, the outer circumference of the grinding wheel The unconsumed glass fiber winding layer on the surface will fall off partly or entirely, that is, the possibility of grinding wheel rupture still exists

On the other hand, the impregnation amount of glass fiber roving is usually low during impregnation, and the wettability of impregnating resin to glass fiber roving is low. Partially impregnated with resin, resulting in a single bundle of rovings not firm, the bonding between layers is not strong, the winding layer is not formed as a whole, and the shrinkage rate is zero after heat treatment and hardening, so that the glass fiber winding layer and the outer peripheral surface of the grinding wheel body have no adhesion force. Therefore, its peel strength is very low, and gaps often appear after a period of use and eventually lead to peeling or falling off