▎ 摘　　要

NOVELTY - Environmentally friendly coated sand with low cost comprises 100-110 pts. wt. raw sand, 5-10 pts. wt. thermoplastic phenolic resin, 1-1.5 pts. wt. thermosetting phenolic resin, 5-10 pts. wt. hyperbranched graphene oxide, 0.5-0.8 pts. wt. curing agent, 1-1.2 pts. wt. lubricant, the curing agent polyformaldehyde lubricant is calcium stearate. USE - Environment-friendly coated sand. ADVANTAGE - The low-cost environment-friendly coated sand has excellent surface tensile strength, adhesive strength and mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for processing environment-friendly coated sand with low cost, which involves: 1.taking phenol m-diphenol oxalic acid and potassium sulfide, mixing and stirring uniformly heating to 100-120 ° C, then slowly adding formaldehyde solution controlling the temperature at 90-100 ° C for polycondensation after finishing reaction decompressing and distilling to obtain the thermoplastic phenolic resin; 2. preparing hyper- branched graphene oxide after mixing trimethylolpropane triacrylate and 3-amino propyl triethoxy silane adding tetrahydrofuran solution reacting for 12-13 hours at 50-60℃, decompressing and distilling to remove tetrahydrofuran, adding graphene oxide centrifuging and washing after finishing reaction vacuum drying to obtain the hyperbranched graphene oxide; 3. preparing coated sand heating the raw sand to 140-150 ° C into the sand mixer adding thermoplastic phenolic resin mixed sand 1-2 min cooling to 110-120 ° C, adding thermosetting phenolic resin hyperbranched graphene oxide curing agent mixing for 1-2 min cooling to 90-95 ° C, then adding lubricant mixing for 2 to 3 min to the temperature of the mixture is 70 to 80 ° C discharging crushing the discharging sieving to obtain low-cost environment- friendly coated sand.