Durable super-hydrophobic spray based on cellulose nanocrystals as well as preparation method and application of durable super-hydrophobic spray

The invention relates to durable super-hydrophobic spray based on cellulose nanocrystals as well as a preparation method and application of the durable super-hydrophobic spray. The preparation method comprises the following steps: preparing aldehyde cellulose nanocrystals; then dispersing the aldehyde cellulose nanocrystals in water, adding Tris-HCl to adjust the pH value to 8-10, and then adding dopamine hydrochloride to react to prepare PDA-coated CNC; the method comprises the following steps: adding an acidic buffer agent into a water/ethanol mixed solution to adjust the pH value to 3.5-5, then adding DTMS, and stirring at 20-40 DEG C to obtain a pre-hydrolysate; adding PDA-coated CNC into the pre-hydrolysate, stirring at 40-60 DEG C, and drying the precipitate to obtain DTMS/PDA-coated CNC; dTMS/PDA-coated CNC is added into a mixed solution of epoxy resin and a curing agent, and uniform mixing is performed to prepare the durable super-hydrophobic spray. The durable super-hydrophobic spray is good in hydro