▎ 摘　　要

NOVELTY - An aqueous coating comprises 46-48 pts. wt. acrylic acid-modified polyurethane, 23-24 pts. wt. water-soluble phenolic resin, 24-25 pts. wt. glycerol epoxy resin, 8.5-9 pts. wt. modified graphene, 5-6 pts. wt. light calcium carbonate, 3.5-4 pts. wt. fumed silica, 1.2-1.3 pts. wt. film-forming aid, 0.8-0.9 pt. wt. defoaming agent, 2.2-2.3 pts. wt. dispersant, 4-5 pts. wt. pigment, 1.7-1.8 pts. wt. wetting agent, 1.2-1.4 pts. wt. leveling agent, 1.5-1.6 pts. wt. rheological additives, and 63-64 pts. wt. deionized water. USE - High mechanical property and wear-resistant aqueous coating for engineering machinery. ADVANTAGE - The coating has high mechanical property, wear-resisting property, and satisfies the requirement of engineering machinery aqueous coating. DETAILED DESCRIPTION - An aqueous coating comprises 46-48 pts. wt. acrylic acid-modified polyurethane, 23-24 pts. wt. water-soluble phenolic resin, 24-25 pts. wt. glycerol epoxy resin, 8.5-9 pts. wt. modified graphene, 5-6 pts. wt. light calcium carbonate, 3.5-4 pts. wt. fumed silica, 1.2-1.3 pts. wt. film-forming aid, 0.8-0.9 pt. wt. defoaming agent, 2.2-2.3 pts. wt. dispersant, 4-5 pts. wt. pigment, 1.7-1.8 pts. wt. wetting agent, 1.2-1.4 pts. wt. leveling agent, 1.5-1.6 pts. wt. rheological additives, and 63-64 pts. wt. deionized water. The water-soluble phenolic resin is prepared by mixing formaldehyde and phenol in molar ratio (2.8-3.2):(0.8-1.1). The modified graphene is prepared by mixing 0.9-1.1 pts. wt. graphene and 7-8 pts. wt. sulfuric acid/nitric acid complex solution in reactor (I) placed in 66-67 degrees C water bath, ultrasonically dispersing for 1.5-1.6 hours with frequency 16-17 kHz and power 850-880 W to obtain material (A), placing material (A) in 4-5x 103 pts. wt. deionized water, adjusting pH value to 6.8-7.1, aging for 0.9-1 hour, filtering, drying to obtain material (B), mixing material (B), 7-8 pts. wt. thionyl chloride, and 3.5-4 pts. wt. N,N-dimethylformamide, placing reactor (II) at 71-72 degrees C, vacuum distilling for 0.6-0.7 hour, heat preserving under protection of nitrogen for 16.5-17 hours, suction filtering, aging for 0.8-0.9 hour, drying to obtain material (C), adding 2.5-3 pts. wt. triethylenetetramine into reactor (III) to mix evenly, ultrasonically dispersing for 2.4-2.8 hours with frequency 52-54 kHz and power 930-960 W, increasing reactor (III) temperature to 106-107 degrees C, heat preserving for 2.4-2.6 hours, vacuum distilling for 0.6-0.7 hour, filtering, and drying. The sulfuric acid/nitric acid complex solution comprises 96-98% sulfuric acid solution and 50-53% nitric acid solution in weight ratio 3:(1-2).