Organic silicon heat-proof coating based on hollow nano-microspheres and preparation method of organic silicon heat-proof coating

The invention discloses an organic silicon heat-proof coating based on nano hollow microspheres. The organic silicon heat-proof coating comprises the following components in parts by mass: 90-150 parts of modified organic silicon resin; 8-15 parts of a ceramic forming filler; 5-10 parts of a fluxing agent; 55-75 parts of a heat insulation filler; 5 to 15 parts of shape-maintaining filler; 7-15 parts of a flame retardant; 10-15 parts of a curing agent; 0.5 to 1.0 part of a catalyst; 200 to 300 parts of a diluent; the modified organic silicon resin is hydroxyl-terminated methyl phenyl silicon resin comprising a molecular chain segment with a body structure and a molecular chain segment with a linear structure. The invention also discloses a preparation method of the coating. The coating provided by the invention has lower density, higher elongation and lower heat conductivity, meets the technical requirements of aircrafts on light-weight, high-toughness and high-heat-protection coatings, and provides technical