▎ 摘　　要

NOVELTY - Preparing two-component paint composition, comprises adding hydroxyacrylic resin dispersion, defoamer, leveling agent, dispersant, film-forming aid, bactericide, and thickening into a stirring container containing water in sequence, where the stirring speed is 300-400 revolutions/minute and the dispersion is 15- 20 minutes, adding pigment and matting powder, increasing the stirring speed to 2000-2300 revolutions/minute, dispersing for 50-60 minutes, adding modified graphene suspension, stirring under speed of 500-600 revolutions/minute, the dispersion time is 5-10 minutes, adding in a cool place after eliminating air bubbles to obtain component A, adding curing agent B component, stirring under a rate of 200-300 revolutions/minute, adding water to dilute to the construction viscosity, and filtering through a 200-mesh filter cloth to obtain a two-component water-based polyurethane coating. USE - The method is useful for preparing two-component paint composition. ADVANTAGE - The composition has extremely high corrosion resistance sex. DETAILED DESCRIPTION - Preparing two-component paint composition, comprises adding hydroxyacrylic resin dispersion, defoamer, leveling agent, dispersant, film-forming aid, bactericide, and thickening into a stirring container containing water in sequence, where the stirring speed is 300-400 revolutions/minute and the dispersion is 15- 20 minutes, adding pigment and matting powder, increasing the stirring speed to 2000-2300 revolutions/minute, dispersing for 50-60 minutes, adding modified graphene suspension, stirring under speed of 500-600 revolutions/minute, the dispersion time is 5-10 minutes, adding in a cool place after eliminating air bubbles to obtain component A, adding curing agent B component, stirring under a rate of 200-300 revolutions/minute, adding water to dilute to the construction viscosity, and filtering through a 200-mesh filter cloth to obtain a two-component water-based polyurethane coating. The modified graphene suspension contains 15-20 wt.% double bond-rich sulfonyl modified graphene, 1- 2 wt.% surfactant and deionized water. The preparation process of the modified graphene suspension comprises (a) carrying out surface pretreatment of commercially available graphene by taking 300-400 mg of commercially available graphene powder, placing it in a three-necked flask containing a mixed solution of sulfuric acid and nitric acid, and heating it at 100°C Under reflux treatment for 3-4 hours, natural cooling, filtering, washing to pH=5-6, to obtain graphene suspension; (ii) placing graphene suspension in the anode chamber of the electrolytic cell containing the diaphragm and stir it, using the platinum sheet as the anode and the carbon rod as the cathode, and perform constant Voltage or constant current electrochemical purification treatment, the constant voltage: 1.5-3V constant voltage treatment for 15-17 minutes; or 0.5-2mA constant current treatment for 17-19 minutes, the temperature is 30-35°C, and the stirring speed is 800-900 revolutions/minutes; (iii)turning off the power of the electrolytic cell, turn on the ultrasonic breaker, placing the ultrasonic vibrating rod of the ultrasonic breaker in the anode chamber, the ultrasonic frequency is 5000-6000 Hz, and the ultrasonic time is 1-2 minutes; (iv)repeating steps multiple times, where the number of repetitions is 5-8 times; (v) dissolving 1-2mmol 4-methylbenzenesulfonylhydrazide in methanol solvent, adding 10-13 wt.% tetrabutylammonium iodide, 5-10 ml saturated ammonium carbonate , 7-10 g pure graphene suspension, and using potassium hydroxide to adjust the pH to 8-9, where the electrochemical condition is 40-50 mA, the time is 4-5 hours, and the temperature is 25-30 degrees Celsius; and (vi)fully reacting, filtering and washing repeatedly with ethanol and acetone alternately, and then ultrasonically dispersing the filtrate in deionized water containing surfactant to obtain a modified graphene suspension.