▎ 摘　　要

NOVELTY - Preparation of composite coating involves heating dicyclohexylmethane diisocyanate to 65-75 degrees C, stirring for 30-80 minutes, obtaining coating component (A), mixing 4,4'-diamino diphenyl ether with amino terminated polyether D-400 and isophorone diamine, stirring for 30-80 minutes, obtaining coating component (B), mixing 1-2 g graphene oxide with 40-100 mL deionized water, ultrasonically dispersing for 2-4 hours, obtaining graphene oxide dispersion, dissolving 1-1.5 g sodium molybdate in 40-80 mL deionized water, obtaining sodium molybdate dihydrate solution, adding sodium molybdate dihydrate solution to graphene oxide dispersion, obtaining solution (A), dissolving thiourea and hydrazine hydrate in 30-50 mL deionized water, obtaining solution (B), adding solution (B) to solution (A), hydrothermally reacting at 180-250 degrees C for 15-25 hours, drying at 60-176 degrees C, obtaining graphene oxide-loaded molybdenum disulfide nano-composite material. USE - Preparation of impact-resistant and wear-resistant composite coating for impeller of sand making machine. ADVANTAGE - The method enables to prepare composite coating, which has good fluidity, improved bonding strength between graphene oxide and polyurea by mechanical locking effect between molybdenum disulfide nano sheet and polyurea in solidifying process, enhanced performance, high physical strength, high anti-shearing, high speed impact and high speed large deformation lower strength retention rate of polyurea coating, suitable for sand making machine in cobblestone, granite hardness, high abrasive index of raw material impact, and improves service life of the impeller of the sand making machine. DETAILED DESCRIPTION - Preparation of composite coating involves heating dicyclohexylmethane diisocyanate to 65-75 degrees C, stirring for 30-80 minutes, obtaining coating component (A), mixing 4,4'-diamino diphenyl ether with amino terminated polyether D-400 and isophorone diamine, stirring for 30-80 minutes, obtaining coating component (B), mixing 1-2 g graphene oxide with 40-100 mL deionized water, ultrasonically dispersing for 2-4 hours, obtaining graphene oxide dispersion, dissolving 1-1.5 g sodium molybdate in 40-80 mL deionized water, obtaining sodium molybdate dihydrate solution, adding sodium molybdate dihydrate solution to graphene oxide dispersion, obtaining solution (A), dissolving thiourea and hydrazine hydrate in 30-50 mL deionized water, obtaining solution (B), adding solution (B) to solution (A), hydrothermally reacting at 180-250 degrees C for 15-25 hours, drying at 60-176 degrees C, obtaining graphene oxide-loaded molybdenum disulfide nano-composite material, dispersing component (B) and component (C) in mass ratio of 1 g:1-10 mg, ultrasonically dispersing for 1-3 hours, forming mixture, adding component (A) and mixture to connected spraying device, heating mixture to 65-75 degrees C, spraying graphene/polyurea composite coating, controlling pressure gage of component (A) and mixture at 1200-1500 psi and 200-1500 psi, and solidifying. The mass ratio of component (A), component (B) and component (C) is 1-3 g:1-2 g:1-10 mg.