▎ 摘　　要

NOVELTY - A composite antifreezing agent is prepared by uniformly and ultrasonically dispersing graphene oxide, dicyclohexyl carbodiimide, tributyl phosphate and silane coupling agent in water, stirring, reacting at 60-120 degrees C for 6-12 hours, centrifuging, washing and drying to obtain modified graphene oxide, dispersing in mixed solvent of formic acid, water and ethanol, reacting at 30-120 degrees c for 5-24 hours, centrifuging, washing and drying to obtain graphene oxide-silica composite, uniformly mixing alkyl organic amine, triterpenoid, initiator, acrylamide, surfactant and graphene oxide-silica composite in water, heating to 60-80 degrees C, ultrasonically processing for 30-60 minutes at frequency of 40-50 KHz, adding diatomite, sodium hexametaphosphate, sodium sulfate, calcium lignosulfonate, sulfamate and sodium gluconate, and continuously stirring for 5-15 minutes. USE - Method for preparing composite antifreezing agent used for repairing engineering concrete. ADVANTAGE - The product can be used at 20 degrees C, and improves concrete strength and durability.