▎ 摘　　要

NOVELTY - Preparing super-hydrophobic and corrosion-resistant polyurea composite coating comprises e.g. (i) polishing the metal substrate to smooth surface using 800-1200-mesh sand paper, placing the metal substrate after grinding into the mixed solution of ethanol and acetone, ultrasonically washing the metal substrate for 1-2 hours using ultrasonic device under the power of 60-80 W, drying for 1-2 hours at 60-80 degrees C, (ii) adding 5-30 pts. wt. ionic liquid and 1-8 pts. wt. fluorinated graphite into 15-50 pts. wt. deionized water using ultrasonic device to ultrasonically disperse uniformly to obtain dispersion liquid at 50-100 W power, transferring the dispersion to the reaction kettle, heating to 180-220 degrees C and reacting for 20-24 hours to obtain the black mixed solution, injecting the black mixed solution into the centrifuge to centrifuge for 30-40 minutes at the rotating speed of 2000- 3000 revolutions/minute, collecting the supernatant of 1/2 of the upper layer. USE - The method is useful for preparing super-hydrophobic and corrosion-resistant polyurea composite coating. ADVANTAGE - The method improves the wetting performance of the polyurea composite coating, and fluorinated graphene and polyurea coating system are combined with each other, good physical shielding effect, can block and extend the diffusion path of corrosive media, and improves the corrosion resistance of the coating. DETAILED DESCRIPTION - Preparing super-hydrophobic and corrosion-resistant polyurea composite coating comprises (i) polishing the metal substrate to smooth surface using 800-1200-mesh sand paper, placing the metal substrate after grinding into the mixed solution of ethanol and acetone, ultrasonically washing the metal substrate for 1-2 hours using ultrasonic device under the power of 60-80 W, drying for 1-2 hours at 60-80 degrees C, (ii) adding 5-30 pts. wt. ionic liquid and 1-8 pts. wt. fluorinated graphite into 15-50 pts. wt. deionized water using ultrasonic device to ultrasonically disperse uniformly to obtain dispersion liquid at 50-100 W power, transferring the dispersion to the reaction kettle, heating to 180-220 degrees C and reacting for 20-24 hours to obtain the black mixed solution, injecting the black mixed solution into the centrifuge to centrifuge for 30-40 minutes at the rotating speed of 2000- 3000 revolutions/minute, collecting the supernatant of 1/2 of the upper layer, adding 15-30 pts. wt. de-ionized water into the collected supernatant, ultrasonically dispersing the same power and time for more than one time, and re-injecting the same rotating speed and centrifugal time for centrifuging for more than one time in the centrifuge, collecting the supernatant after finishing the above one time, repeating for 5-10 times, freezing and drying the finally obtained fluorinated graphene dispersion liquid for 24 hours to obtain the graphene fluoride nano powder, (iii) dehydrating and processing 30-50 pts. wt. polycaprolactone polyol at 100-120 degrees C for 2-5 hours, adding 40-70 pts. wt. diisocyanate, placing the mixture in the atmosphere furnace with protective gas, heating at 105-120 degrees C at a heating rate of 5-10 degrees C, and keeping the temperature for 2-3 hours, taking out after cooling with the furnace to obtain polyurea A component, (iv) adding 20-30 pts. wt. amino-terminated polyether and 40-60 pts. wt. amine chain extender into the reaction kettle, stirring for 10-30 minutes at the speed of 50-100 revolutions/minute to make it mix uniformly, heating the reaction kettle to 100-120 degrees C to react for 2 hours, punching protective gas and opening cooling water cooling to 50-55 degrees C, taking out to obtain polyurea B component after cooling, and (v) mixing 1-10 pts. wt. fluorinated graphene nano-powder into 25-35 pts. wt. component B and uniformly dispersing to obtain mixture, adding 50-65 pts. wt. component A and mixture into a connected spraying device and heating the mixture to 60-70 degrees C to spray, when spraying polyurea composite coating, the surface pressure of the pressure gauge of the component A and the mixture is controlled between 1200 and 1500 Psi, and the pressure difference is controlled below 200 Psi respectively spraying to the surface of the metal base material, and solidifying.