▎ 摘　　要

NOVELTY - Preparing elastic aerogel material based on aqueous benzoxazine emulsion involves reacting amino-terminated polydimethylsiloxane containing hydrophilic groups in the side chain with paraformaldehyde and phenol at 30-100 C to obtain an aqueous benzoxazine monomer (I). The aqueous benzoxazine monomer, initiator and template are fully stirred and mixed at 25-40 degrees C to obtain an emulsion, the freezing light reaction is performed below -100-0 degrees C to obtain preliminary frozen product, where the ratio of the aqueous benzoxazine monomer, template and initiator is 10:1:0.1-10:5:0.5. The preliminary frozen product obtained is placed into a freeze dryer and freeze-dried to obtain an elastic aerogel material. USE - Method for preparing elastic aerogel material based on aqueous benzoxazine emulsion used in the preparation of thermal insulation materials, oil-water separation materials and electronic skins (claimed). ADVANTAGE - The method is easy to obtain raw material, mild reaction condition, has good practicability, low density, good rebound resilience, low thermal conductivity, surface wettability. DETAILED DESCRIPTION - Preparing elastic aerogel material based on aqueous benzoxazine emulsion involves reacting amino-terminated polydimethylsiloxane containing hydrophilic groups in the side chain with paraformaldehyde and phenol at 30-100 C to obtain an aqueous benzoxazine monomer of formula (I). The aqueous benzoxazine monomer, initiator and template are fully stirred and mixed at 25-40 degrees C to obtain an emulsion, the freezing light reaction is performed below -100-0 degrees C to obtain preliminary frozen product, where the ratio of the aqueous benzoxazine monomer, template and initiator is 10:1:0.1-10:5:0.5. The preliminary frozen product obtained is placed into a freeze dryer and freeze-dried to obtain an elastic aerogel material. R1=COO-, SO3-, SO4-; and R2=group of formulae (II-III).