Composition used for manufacturing main track steel rail grinding wheel and preparation method and application thereof

The invention provides a composition used for manufacturing main track steel rail grinding wheel, wherein the composition comprises the polybenzoxazine resin, basalt fibre, zinc borate, brown aluminium oxide and silicon nitride; according to the weight percentage, the composition comprises 10-14% of the polybenzoxazine resin, 4-8% of the basalt fibre, 3-12% of the zinc borate, 56-68% of the brown aluminium oxide and 6-19% of the silicon nitride. The grinding wheel prepared by the composition is small in grinding ratio and great in grinding capacity, the pressure of the polishing motor is stable during the polishing process, the polishing roughness is small, the grinding wheel is not easy to crush and the steel rail has no blueing phenomenon.