Modified hollow glass bead and application thereof in heat insulation glass fiber reinforced composite material

The invention discloses a modified hollow glass bead which is prepared by grafting SiO2 on the surface of a hollow glass bead in an in-situ growth manner and modifying the hollow glass bead with a vinyltriethoxysilane coupling agent. The invention also discloses a heat-insulating glass fiber reinforced composite material and a preparation method thereof, the heat-insulating glass fiber reinforced composite material is mainly prepared from 55.6-58.7% by mass of glass fibers and an infiltrating material; the infiltration material is prepared from the following raw materials in percentage by mass: 64-80% of epoxy resin, 16-20% of a curing agent, 0.5-9% of a vinyl silane coupling agent and 1-20% of modified hollow glass beads. The heat-insulating and heat-preserving glass fiber reinforced composite material prepared by the invention has good interface bonding effect and mechanical property, not only has good heat resistance and heat preservation property, but also has relatively high strength and toughness improv