▎ 摘　　要

NOVELTY - Modified epoxy polyurethane sealant comprises 10-20 pts. wt. bisphenol A epoxy resin, 10-20 pts. wt. vinyl ester resin, 0.1-0.5 pts. wt. silicon dioxide, 0.1-0.5 pts. wt. aluminum oxide, 0.1-0.5 pts. wt. graphene oxide, 0.01-0.2 pts. wt. octadecylamine, 5-10 pts. wt. silane coupling agent, 10-30 pts. wt. propylene oxide, 30-50 pts. wt. dicyclohexylmethane diisocyanate, 30-60 pts. wt. polyether triol, 1-3 pts. wt. dibutyltin dilaurate, 1-5 pts. wt. polyaziridine crosslinking agent, 1-5 pts. wt. diethyltoluenediamine, 2-8 pts. wt. curing agent, and 20-30 pts. wt. solvent. The epoxy equivalent of the bisphenol A epoxy resin is 180-200 g/mol. The vinyl ester resin is vinyl ester resin 411, vinyl ester resin 806, vinyl ester resin 430 or vinyl ester resin 901. The curing agent is a compound curing agent of polyetheramine and polythiol in a mass ratio of 9:1. The solvent is acetone, absolute ethanol, or toluene. USE - Used as modified epoxy polyurethane sealant. ADVANTAGE - The sealant has excellent mechanical properties, good adhesion performance, good weather resistance, high temperature resistance, and good electrical insulation. DETAILED DESCRIPTION - Modified epoxy polyurethane sealant comprises 10-20 pts. wt. bisphenol A epoxy resin, 10-20 pts. wt. vinyl ester resin, 0.1-0.5 pts. wt. silicon dioxide, 0.1-0.5 pts. wt. aluminum oxide, 0.1-0.5 pts. wt. graphene oxide, 0.01-0.2 pts. wt. octadecylamine, 5-10 pts. wt. silane coupling agent, 10-30 pts. wt. propylene oxide, 30-50 pts. wt. dicyclohexylmethane diisocyanate, 30-60 pts. wt. polyether triol, 1-3 pts. wt. dibutyltin dilaurate, 1-5 pts. wt. polyaziridine crosslinking agent, 1-5 pts. wt. diethyltoluenediamine, 2-8 pts. wt. curing agent, and 20-30 pts. wt. solvent. The epoxy equivalent of the bisphenol A epoxy resin is 180-200 g/mol. The vinyl ester resin is vinyl ester resin 411, vinyl ester resin 806, vinyl ester resin 430 or vinyl ester resin 901. The curing agent is a compound curing agent of polyetheramine and polythiol in a mass ratio of 9:1. The solvent is acetone, absolute ethanol, or toluene. The preparation method of the modified epoxy polyurethane sealant comprises mixing silicon dioxide, one third of the silane coupling agent, and one-third of the solvent, and magnetically stirring at 40 degrees C for 1 hour to obtain silicon dioxide dispersion liquid, mixing aluminum oxide, one third of the silane coupling agent, and one third of the solvent, stirring magnetically at 40 degrees C for 1 hour to obtain a dispersion of alumina trioxide, mixing graphene oxide, octadecylamine, and one-third of the solvent, stirring magnetically at 30 degrees C for 6 hours to obtain a modified graphene oxide dispersion, adding bisphenol A epoxy resin, vinyl ester resin, and propylene oxide into a glass container, and stirring magnetically at 60-70 degrees C for 1 hour, adding the silicon dioxide dispersion, the alumina trioxide dispersion, and the modified graphene oxide dispersion in sequence, magnetically stirring at room temperature for 1 hour, and ultrasonically dispersing at room temperature for 30 minutes, transferring the solution in the glass container to a vacuum degassing machine, and performing vacuum stirring and degassing treatment for 1 hour to obtain a mixed solution a, placing polyether triol in a vacuum drying oven for vacuum dehydration for 2 hours, adding mixed solution a, stirring at 200-400 revolutions/minute in vacuum atmosphere, and dispersing at high speed for 1 hour to obtain a mixed solution b, adding dicyclohexylmethane diisocyanate into the reaction vessel, heating the water bath to 70-80 degrees C, stirring at 100-150 revolutions/minute, adding polyethylenimine crosslinking agent and stirring for 1 hour, adding diethyltoluenediamine and continuously stirring for 1 hour, adding the mixed solution b, dibutyl tin dilaurate and curing agent in sequence, and continuously stirring for 2-3 hours.