▎ 摘　　要

NOVELTY - Preparation of graphene oxide/sodium lignosulfonate modified polyurethane rigid foam material involves preparing lignin liquefaction product and modified graphene oxide dispersion, mixing to obtain a composite material, adding a foaming catalyst, a chain growth catalyst, a stabilizer and a foaming agent to produce polyhydroxy component, adding specific isocyanate component to the polyhydroxy component, stirring for 15-20 seconds, pouring the mixture into a mold, foaming at room temperature, and aging at room temperature for 24-48 hours. USE - Preparation of graphene oxide/sodium lignosulfonate modified polyurethane rigid foam material. DETAILED DESCRIPTION - Preparation of graphene oxide/sodium lignosulfonate modified polyurethane rigid foam material involves mixing polyethylene glycol 400, glycerol and concentrated sulfuric acid to obtain a mixture (A), stirring, adding 1-10 %mass sodium lignosulfonate powder, heating in an oil bath at 80-120 degrees C for 30-60 minutes, cooling to room temperature to produce lignin liquefaction product, dispersing graphene oxide in anhydrous acetone, ultrasonically stirring to obtain graphene oxide dispersion, adding diphenylmethylene diisocyanate, mixing to obtain a mixture (B), refluxing for 1-2 hours under stirring at 50-60 degrees C to obtain modified graphene oxide dispersion, mixing the lignin liquefaction product and polyether polyol in mass ratio of 1:(1-5) to obtain a composite material, adding a foaming catalyst, a chain growth catalyst, a stabilizer and a foaming agent to the composite material to produce polyhydroxy component, determining the hydroxyl value of the polyhydroxy component, calculating mass of isocyanate component required for reaction with the polyhydroxy component from the isocyanate index of 1-1.1, adding missing isocyanate to the modified graphene oxide dispersion, mixing to obtain the isocyanate component used for foaming, adding resulting isocyanate component into the polyhydroxy component, stirring for 15-20 seconds, pouring the mixture into a mold, foaming at room temperature, and aging at room temperature for 24-48 hours. The mass ratio of glycerol and polyethylene glycol is (1-2):9. The mass ratio of concentrated sulfuric acid and polyethylene glycol is 1:(9-30). The volume ratio of graphene oxide to anhydrous acetone is 1:(16-80). The mass ratio of graphene oxide dispersion to isocyanate is 1:(8-40). The mass ratio of the foaming catalyst and the composite material is (0.2-0.3):100. The mass ratio of chain growth catalyst to the composite material is (0.5-0.6):100. The mass ratio of the stabilizer to the composite material is (2.4-2.5):100. The mass ratio of the foaming agent to the composite material is (0.5-0.6):100.