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CN-118638463-B - Preparation method of super-hydrophobic composite coating for resisting algae adhesion

CN118638463BCN 118638463 BCN118638463 BCN 118638463BCN-118638463-B

Abstract

The invention discloses a preparation method of an anti-algae-adhesion superhydrophobic composite coating. The preparation method comprises the steps of uniformly dispersing epoxy resin into an ester substance to obtain a mixed solution A, adding polyhexamethylene guanidine hydrochloride, polyvinylpyrrolidone, nano TiO 2 , polytetrafluoroethylene micro powder, graphene oxide and gamma-aminopropyl triethoxysilane into the mixed solution A, uniformly mixing to obtain a mixed solution B, adding fluorine-containing silane and polyether amine curing agent into the mixed solution B, uniformly dispersing to obtain a mixed solution C, spraying the mixed solution C onto the surface of a substrate, and carrying out ventilation drying at normal temperature to obtain the super-hydrophobic composite coating. The super-hydrophobic coating prepared by the invention not only has the characteristics of low contact area with water, low viscosity, self-cleaning and the like, but also has good anti-algae adhesion performance, and has wide application prospect in marine antifouling.

Inventors

  • LI CHANGQUAN
  • XU GUOQIANG
  • LIANG FUHAO
  • OU JUNFEI
  • WANG FAJUN
  • LI WEN
  • Arida amifazli

Assignees

  • 江苏理工学院

Dates

Publication Date
20260512
Application Date
20240625

Claims (10)

  1. 1. The preparation method of the super-hydrophobic composite coating is characterized by comprising the following steps of: (1) Uniformly dispersing epoxy resin into the ester substance to obtain a mixed solution A; (2) Adding polyhexamethylene guanidine hydrochloride, polyvinylpyrrolidone, nano TiO 2 , polytetrafluoroethylene micro powder, graphene oxide and gamma-aminopropyl triethoxysilane into the mixed solution A, and uniformly mixing to obtain a mixed solution B; (3) Adding fluorine-containing silane and polyether amine curing agent into the mixed solution B, and uniformly dispersing to obtain a mixed solution C; (4) Spraying the mixed solution C on the surface of a substrate, and performing ventilation drying at normal temperature to obtain the super-hydrophobic composite coating.
  2. 2. The preparation method of the super-hydrophobic composite coating according to claim 1, wherein in the step (2), the mass ratio of polyhexamethylene guanidine hydrochloride to polyvinylpyrrolidone to nano TiO 2 to graphene oxide is 1-3:2-8:20-50:2-10.
  3. 3. The method for preparing the super-hydrophobic composite coating according to claim 1, wherein the ester substance comprises at least one of butyl acetate, ethyl acetate, methyl acetate, phenyl acetate and methyl benzoate, and the fluorine-containing silane is 1H, 2H-perfluoro octyl triethoxysilane.
  4. 4. The method for preparing a superhydrophobic composite coating according to claim 1, wherein the epoxy resin is E-51 and the polyether amine curing agent is D-230.
  5. 5. The method for preparing the super-hydrophobic composite coating according to claim 1, wherein the particle size of the nano TiO 2 is 20-40nm, and the particle size of the polytetrafluoroethylene micro powder is 1-2 μm.
  6. 6. The method for preparing a superhydrophobic composite coating according to claim 1, wherein the mass ratio of the epoxy resin to the polyether amine curing agent is 2-4:1-3.
  7. 7. The method for preparing a superhydrophobic composite coating according to claim 1, wherein in the steps (1) and (3), the dispersion method is that ultrasonic vibration dispersion is performed first, and then continuous stirring dispersion is performed.
  8. 8. The preparation method of the super-hydrophobic composite coating according to claim 7, wherein the ultrasonic vibration dispersion method is that ultrasonic power is 160-200W, frequency is 30-50kHz, vibration dispersion is 10-30min, and stirring dispersion method is that stirring is 200-600r/min for 30-120min.
  9. 9. The method for preparing the super-hydrophobic composite coating according to claim 1, wherein in the step (4), the mixed solution C is sprayed on the surface of the substrate, and the method for normal-temperature ventilation drying is that a spray gun is adopted for spraying, the vertical distance between the nozzle of the spray gun and the substrate is adjusted to be 10-20cm, the spray gun is slowly sprayed for 30-45s under 0.4-0.6MPa, and the spraying speed is 2-6cm/s.
  10. 10. The method for preparing a superhydrophobic composite coating according to claim 9, wherein the nozzle diameter is 0.3-0.7mm.

Description

Preparation method of super-hydrophobic composite coating for resisting algae adhesion Technical Field The invention relates to a preparation method of a hydrophobic coating, in particular to a preparation method of an anti-algae-adhesion superhydrophobic composite coating. Background Microorganisms such as algae are extremely easy to breed and reproduce on the surface of materials. If the bioadhesion of the ship can reduce the navigation speed of the ship, increase the fuel consumption, the maintenance cost and the emission of harmful gas, the bionic super-hydrophobic surface has good application prospect in the fields of bioadhesion resistance, corrosion resistance and pollution resistance due to the unique wettability of the bionic super-hydrophobic surface inspired by the natural lotus leaf and other surfaces with natural hydrophobic characteristics. However, the conventional superhydrophobic coating has the problems of fragile microstructure, extremely difficult recovery after physical damage such as friction and extrusion, and the like, which is challenging to large-scale use of the superhydrophobic coating. Therefore, on the premise of simplifying the preparation process and reducing the preparation cost, the design and construction of the super-hydrophobic coating with good anti-biological adhesion, mechanical stability and chemical stability are particularly important. Chinese patent CN107573811a discloses a wear-resistant corrosion-resistant waterproof coating for environmental protection equipment, which adopts nano titanium dioxide and graphene oxide in its components to prepare a corrosion-resistant waterproof coating, but the titanium dioxide content in the coating is less than 4wt%, the requirement of inhibiting algae adhesion and growth cannot be satisfied under the dosage, and increasing the titanium dioxide content can not only resist algae adhesion growth, but also affect the hydrophobic performance of the coating, mainly because the higher titanium dioxide content interferes with the effect of graphene oxide, so that the hydrophobic performance of the coating is reduced. Therefore, a coating having both superhydrophobic performance and anti-algae adhesion performance cannot be prepared based on the patent. Disclosure of Invention The invention aims to provide a preparation method of a super-hydrophobic composite coating, which solves the problem of how to prepare a coating with super-hydrophobic performance and anti-algae adhesion performance. The preparation method of the super-hydrophobic composite coating comprises the following steps: (1) Uniformly dispersing epoxy resin into the ester substance to obtain a mixed solution A; (2) Adding polyhexamethylene guanidine hydrochloride, polyvinylpyrrolidone, nano TiO 2, polytetrafluoroethylene micro powder, graphene oxide and gamma-aminopropyl triethoxysilane into the mixed solution A, and uniformly mixing to obtain a mixed solution B; (3) Adding fluorine-containing silane and polyether amine curing agent into the mixed solution B, and uniformly dispersing to obtain a mixed solution C; (4) Spraying the mixed solution C on the surface of a substrate, and performing ventilation drying at normal temperature to obtain the super-hydrophobic composite coating. According to the invention, nano TiO 2 is added to inhibit algae adhesion, and graphene oxide is added to increase the strength and compactness of the coating, so that the hydrophobicity of the coating is improved. According to the invention, the problem that nanometer TiO 2 under the effective algae inhibition dosage can interfere graphene oxide to promote the hydrophobicity of the coating is solved by combining polyhexamethylene guanidine hydrochloride and polyvinylpyrrolidone, so that the coating has both the hydrophobicity and the anti-algae adhesion function. Preferably, in the step (2), the mass ratio of the polyhexamethylene guanidine hydrochloride to the polyvinylpyrrolidone to the nano TiO 2 to the graphene oxide is 1-3:2-8:20-50:2-10. Preferably, the ester substance comprises at least one of butyl acetate, ethyl acetate, methyl acetate, phenyl acetate and methyl benzoate, and the fluorine-containing silane is 1H, 2H-perfluoro octyl triethoxy silane. The mass ratio of the epoxy resin to the ester substance is preferably 2-4:25-45. Preferably, the epoxy resin is E-51 and the polyether amine curing agent is D-230. Preferably, the particle size of the nano TiO 2 is 20-40nm, and the particle size of the polytetrafluoroethylene micro powder is 1-2 mu m. Preferably, the mass ratio of the epoxy resin to the polyether amine curing agent is 2-4:1-3. Preferably, in the steps (1) and (3), the dispersing method is that ultrasonic vibration dispersing is firstly carried out, and then stirring dispersing is continuously carried out. Preferably, the ultrasonic vibration dispersing method is that the ultrasonic power is 160-200W, the frequency is 30-50kHz, the vibration dispersing is carried out for