▎ 摘　　要

NOVELTY - Preparing impact-resistant graphene polyurea composite coating on surface of impeller, comprises (i) carbonizing diimine modified isophorone diisocyanate, xylylene diisocyanate and hydrogenated benzhydryl methane diisocyanate under a protective atmosphere, and mixing and stirring continuously, dropping oil-based branched polyester triol into the mixture, and dropping the polycaprolactone diol, (ii) mixing isophorone diamine, 1,4-bis-sec-butylaminobenzene and 4,4-methylenebis(2,6-diethylaniline), dropping tetrahydroxypropyl diamine and dispersing amino-terminated polyether ultrasonically, (iii) mixing DY-E44 type epoxy resin, DY-E6012 type curing agent, absolute ethanol, methyl silicone oil, polyhexamethylcyclodisiloxane and diglycidyl ether-terminated polydimethylsiloxane, (iv) adding modified graphene powder, isopropyltriethoxysilane and ethyl orthosilicate to absolute ethanol, and ultrasonically dispersing, and (v) stirring and mixing component D and component A, and solidifying. USE - The method is useful for preparing impact-resistant graphene polyurea composite coating on surface of impeller. ADVANTAGE - The method realizes that the composite coating has better impact resistance and wear resistance, and extends the service life of the impeller. DETAILED DESCRIPTION - Preparing impact-resistant graphene polyurea composite coating on the surface of an impeller, comprises (i) carbonizing diimine modified isophorone diisocyanate, xylylene diisocyanate and hydrogenated benzhydryl methane diisocyanate under a protective atmosphere, and mixing and stirring continuously at 80-120 degrees C for 2-4 hours, cooling to 60-70 degrees C, dropping the oil-based branched polyester triol into the mixture, dropping the polycaprolactone diol, and heating to 80-100 degrees C for 4-6 hours, and preparing the coating A component, where the mass ratio of carbodiimide modified isophorone diisocyanate to component A is 25-28%, carbodiimide modified xylylene diisocyanate to component A is 20-24%, carbodiimide modified hydrogenated benzhydryl methane diisocyanate to component A is 10-13%, oil-based branched polyester triol in component A is 25-30% and polycaprolactone diol in component A is 10-15%, (ii) mixing isophorone diamine, 1,4-bis-sec-butylaminobenzene and 4,4-methylenebis(2,6-diethylaniline) at a speed of 2000 revolutions/minute for 1-2 hours, first adding tetrahydroxypropyl diamine dropwise and adding amino-terminated polyether, and ultrasonically dispersing for more than 30 minutes to obtain coating B component, where the mass ratio of isophorone diamine to component B is 14-18%, the mass ratio of 1,4-bis-sec-butylaminobenzene in component B is 20-27%, the mass ratio of 4,4-methylene bis(2,6-diethylaniline) to component B is 26-35%, the mass ratio of tetrahydroxypropyl diamine in component B is 8-15%, and the mass ratio of amino-terminated polyether in component B is 12-25%, (iii) mixing DY-E44 type epoxy resin and DY-E6012 type curing agent and add to absolute ethanol, and dispersing at 2400 revolutions/minute for 1-2 hours, adding methyl silicone oil, polyhexamethylcyclodisiloxane and diglycidyl ether-terminated polydimethylsiloxane, and ultrasonically disperse for more than 30 minutes to prepare coating C component, where the mass ratio of DY-E44 type epoxy resin to C component is 58-72%, the mass ratio of DY-E6012 type curing agent to C component is 22-30%, the mass ratio of methyl silicone oil to component C is 3-5%, the mass ratio of polyhexamethylcyclodisiloxane to component C is 2-4%, and the mass ratio of diglycidyl ether-terminated polydimethylsiloxane to component C is 1-3%, (iv) adding modified graphene powder, isopropyltriethoxysilane and ethyl orthosilicate to absolute ethanol, and ultrasonically dispersing for more than 30 minutes, and obtaining coating D component, where the mass ratio of modified graphene powder to component D is 65-85%, isopropyltriethoxysilane (IPTS) accounts for 10-25% of component D by mass, and the mass ratio of ethyl Orthosilicate (TEOS) in D component is 5-10%, and (v) adding component D to component A and heating to 65-75 degrees C, stirring and mixing on a heated magnetic stirrer for 30-80 minutes, combining group C, dividing into the B component, and dispersing at 3000 revolutions/minute for 1-2 hours, adding the above mixed components into the connected spraying equipment and heating the temperature to 65-75 degrees C, when spraying graphene/polyurea composite coating, A, D mixed components and B, controlling the gauge pressure of the pressure gauge of C mixed component is between 1200-1500 Psi, and the pressure difference between the two below 200Psi for spraying, and solidifying to obtain the graphene/polyurea composite coating.