▎ 摘　　要

NOVELTY - A high-flame retardant ultra-low-density foam absorbing material comprises 100 pts. wt. silane-modified hollow glass beads, 50-400 pts. wt. germanium-containing graphene-modified organic silicone resin, 1-10 pts. wt. germania-containing catalyst and 1-5 pts. wt. tetrahydro-1,5-diol-containing silane. USE - The high flame retardant ultra-low density foam absorbing material is useful in light sea high buoyancy material and underwater structure. ADVANTAGE - The high flame-retardant ultra-low density foam wave-absorbing material has excellent processability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the high flame retardant ultra-low density foam wave absorbing material comprising introducing solvent and graphene oxide into the acid and alkali-resistant reaction kettle, stirring to obtain a uniform slurry, introducing aminosiloxane into the kettle, where the mass ratio of graphene oxide and aminosiloxane is 100:1-20, stirring evenly, heating to 50-120 degreesC, and the reaction time is 1-24 hours to obtain product A and siloxane-modified graphene oxide; solvent, coupling agent, acetic acid and deionized water are added to the reaction kettle, stirred evenly, and the room temperature React for 2 to 10 hours, add hollow glass microbeads, and stir evenly; the temperature in the reactor is heated up to 105 degreesC for the reaction, and the temperature rise rate is 10 degreesC/hour, extracting the solvent and dry to obtain product B and modified hollow glass beads; introducing organic solvent and methyltrimethoxysilane to the reaction kettle, and stirring, and controlling the temperature of the kettle at 0 -5degrees Celsius, introducing acidic deionized water to carry out the hydrolysis reaction of silane, where molar ratio of silane to acidic deionized water is 3-4, the pH value of acidic deionized water is less than 4; the addition time of acidic deionized water is 2-10 hours; continuing reaction for 1-10 hours, heating to 50-90 degreesC, and reaction was continued for 1-10 hours, cooling, introducing deionized water, the weight ratio of the added deionization and organic solvent is 1:1, stirring, allowing to stand, and removing aqueous phase to obtain a mixed solution, adjusting pH value of the mixed solution to 8-9, and carry out the condensation reaction, heating to 50-85degrees Celsius for 1-10 hours; during the reaction, the pH value of the mixed solution is maintained to 8-9; introducing hexamethyldisiloxane and methyl silane to the reaction kettle in ratio of 100:1-10, where addition time is 0.5-1 hour, and reaction time is 1-5 hours, starting the vacuum system of the reaction kettle, extracting the water and methylamine generated by the reaction, confirming that the pH is lower than 7.3, and cooling down to room temperature, introducing silicon oxide alkane-modified graphene oxide and product A, stirring evenly, introducing modified hollow glass microbeads and product B, stirring evenly, heating to 50-80 degreesC, extracting the solvent with a vacuum pump, cooling down to room temperature, add catalyst, stirring evenly to obtain the synthetic foam molding raw material, introducing synthetic foam raw material into the mold, hot-press forming, the hot-pressing temperature is 110-200 degrees Celsius, the hot-pressing time is 20-60 minutes, and the hot-pressing pressure is 0.3-3 MPa.