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CN-121975407-A - Low-surface-energy powder coating for charging pile and preparation method thereof

CN121975407ACN 121975407 ACN121975407 ACN 121975407ACN-121975407-A

Abstract

The invention discloses a low-surface-energy powder coating for a charging pile and a preparation method thereof, and relates to the technical field of coatings. The invention provides a low-surface-energy powder coating for a charging pile, which at least comprises the following raw materials, by mass, 100 parts of fluorine modified hyperbranched polyester resin, 10-30 parts of fluorocarbon resin, 10-30 parts of curing agent, 3-10 parts of nano polytetrafluoroethylene powder, 5-20 parts of fluorine modified glass flake-silicon dioxide composite filler, 0.5-2 parts of wetting dispersant, 0.1-1 part of leveling agent, 3-20 parts of pigment and filler and 0.1-2 parts of auxiliary agent. The low-surface-energy powder coating for the charging pile provided by the invention has the advantages of anti-adhesion property, durability, impact resistance and friction resistance, and is particularly suitable for the surfaces of metal or composite materials which need long-term anti-adhesion and are easy to clean, such as charging pile shells, outdoor cabinets, traffic signs and the like.

Inventors

  • LIU PINGMIN
  • SHAN CONGCONG

Assignees

  • 航佳彩新材料(广东)有限公司

Dates

Publication Date
20260505
Application Date
20260227

Claims (9)

  1. 1. The low-surface-energy powder coating for the charging pile is characterized by at least comprising the following raw materials in parts by mass: 100 parts of fluorine modified hyperbranched polyester resin, 10-30 parts of fluorocarbon resin, 10-30 parts of curing agent, 3-10 parts of nano polytetrafluoroethylene powder, 5-20 parts of fluorine modified glass flake-silicon dioxide composite filler, 0.5-2 parts of wetting dispersant, 0.1-1 part of flatting agent, 3-20 parts of pigment and filler and 0.1-2 parts of auxiliary agent.
  2. 2. The low surface energy powder coating for charging piles according to claim 1, wherein the preparation method of the fluorine modified hyperbranched polyester resin comprises at least the following preparation steps: Mixing perfluorooctyl ethyl methacrylate with anhydrous formic acid, dropwise adding a mixed solution of phosphoric acid and hydrogen peroxide for reaction, separating an oil phase, and drying to obtain epoxy perfluorooctyl ethyl methacrylate; Mixing trimellitic anhydride, the epoxy perfluoro octyl ethyl methacrylate, tetrahydrofuran and tetrabutylammonium bromide for reaction, and separating an oil phase to obtain a fluorine modified hyperbranched polyester precursor; and mixing the fluorine modified hyperbranched polyester precursor, the isobutyric anhydride and the tetrahydrofuran, and performing reduced pressure distillation after the reaction to obtain the fluorine modified hyperbranched polyester resin.
  3. 3. The low surface energy powder coating for a charging pile according to claim 2, wherein the mass ratio of perfluorooctyl ethyl methacrylate to anhydrous formic acid is 10:1-1.5.
  4. 4. The low surface energy powder coating for a charging pile according to claim 2, wherein the mass ratio of the trimellitic anhydride to the epoxy perfluorooctyl ethyl methacrylate is 1:5-7, and the epoxy value of the epoxy perfluorooctyl ethyl methacrylate is 0.15-0.25mol/100g.
  5. 5. The low surface energy powder coating for the charging pile according to claim 2, wherein the mass fraction of fluorine element in the fluorine modified hyperbranched polyester precursor is 30% -45%, the hydroxyl value of the fluorine modified hyperbranched polyester precursor is 120-160mg KOH/g, and the mass ratio of the fluorine modified hyperbranched polyester precursor to the isobutyric anhydride is 10:3-4.
  6. 6. The low surface energy powder coating for a charging pile according to claim 1, wherein the preparation method of the fluorine modified glass flake-silica composite filler at least comprises the following steps: Adding glass flakes into a mixed solution of anhydrous ethanol and ammonia monohydrate, adding the mixed solution into an ethanol solution of tetraethyl orthosilicate, stirring for reaction, adding 1H, 2H-perfluoro decyl triethoxysilane, continuously stirring for reaction, washing and drying to obtain the fluorine modified glass flakes-silicon dioxide composite filler.
  7. 7. The low surface energy powder coating for a charging pile according to claim 6, wherein the addition ratio of the glass flakes, the tetraethyl orthosilicate and the 1h,2 h-perfluorodecyl triethoxysilane is 3-5g:9-15ml:1.2-2mL, and the size of the glass flakes is 300-500 mesh.
  8. 8. The low surface energy powder coating for a charging pile according to claim 1, wherein the curing agent is a blocked isocyanate, the wetting dispersant is at least one of a polyacrylate dispersant or a polyethylene wax dispersant, the leveling agent is at least one of an acrylic leveling agent or an organosilicon leveling agent, the pigment and filler is at least one of titanium pigment, carbon black or barium sulfate, and the auxiliary agent is at least one of benzoin or nano-alumina.
  9. 9. A method for preparing a low surface energy powder coating for a charging pile according to any one of claims 1-8, comprising at least the following preparation steps: adding fluorine modified hyperbranched polyester resin, fluorocarbon resin, curing agent, nano polytetrafluoroethylene powder, fluorine modified glass flake-silicon dioxide composite filler, wetting dispersant, flatting agent, pigment filler and auxiliary agent into a high-speed premixing machine for dry mixing to obtain premix; and adding the premix into a double-screw extruder for melt extrusion, cooling, crushing, grinding and sieving to obtain the low-surface-energy powder coating for the charging pile.

Description

Low-surface-energy powder coating for charging pile and preparation method thereof Technical Field The invention relates to the technical field of coatings, in particular to a low-surface-energy powder coating for a charging pile and a preparation method thereof. Background With the rapid development of the new energy automobile industry, the charging pile is used as a core supporting infrastructure, and the durability and the functional requirements of the outdoor service environment are increasingly prominent. The charging pile is exposed outdoors for a long time, needs to face various environmental stresses such as ultraviolet radiation, high-low temperature circulation, acid rain erosion, salt fog corrosion and the like, is easy to illegally post small advertisements, is infected with pollutants such as dust and bird droppings, influences the neat appearance, and can also cause equipment failure due to shielding of radiating holes by the pollutants and corrosion of a shell structure, so that the service life is shortened. The low-surface-energy powder coating has excellent anti-adhesion, anti-fouling, weather-proof and other characteristics, so that the low-surface-energy powder coating becomes a key material for solving the outdoor protection problem of the charging pile. The powder coating is used as a coating with environmental protection, high utilization rate and excellent coating performance, and is widely applied in the field of outdoor metal protection. However, in order to achieve excellent anti-adhesion and low surface energy characteristics, the traditional powder coating generally needs to rely on special resins such as organic silicon or fluorocarbon, but has the problems of high cost, insufficient adhesion with a base material, poor mechanical properties (such as impact resistance and wear resistance) and the like, and is difficult to completely meet the long-term and harsh outdoor use requirements of the charging pile. Therefore, the low-surface-energy powder coating with excellent anti-sticking performance, durability and impact resistance and simple and controllable preparation process is developed, and has important practical significance and application value. Disclosure of Invention The invention aims to provide a low-surface-energy powder coating for a charging pile and a preparation method thereof, which solve the following technical problems: The existing low-surface-energy powder coating is used for charging piles, and has the problems of poor anti-sticking performance, poor impact resistance and poor durability. The aim of the invention can be achieved by the following technical scheme: The low-surface-energy powder coating for the charging pile at least comprises the following raw materials in parts by mass: 100 parts of fluorine modified hyperbranched polyester resin, 10-30 parts of fluorocarbon resin, 10-30 parts of curing agent, 3-10 parts of nano polytetrafluoroethylene powder, 5-20 parts of fluorine modified glass flake-silicon dioxide composite filler, 0.5-2 parts of wetting dispersant, 0.1-1 part of flatting agent, 3-20 parts of pigment and filler and 0.1-2 parts of auxiliary agent. The preparation method of the fluorine modified hyperbranched polyester resin at least comprises the following preparation steps: Mixing perfluorooctyl ethyl methacrylate with anhydrous formic acid, dropwise adding a mixed solution of phosphoric acid and hydrogen peroxide for reaction, separating an oil phase, and drying to obtain epoxy perfluorooctyl ethyl methacrylate; Mixing trimellitic anhydride, the epoxy perfluoro octyl ethyl methacrylate, tetrahydrofuran and tetrabutylammonium bromide for reaction, and separating an oil phase to obtain a fluorine modified hyperbranched polyester precursor; and mixing the fluorine modified hyperbranched polyester precursor, the isobutyric anhydride and the tetrahydrofuran, and performing reduced pressure distillation after the reaction to obtain the fluorine modified hyperbranched polyester resin. As a further scheme of the invention, the mass ratio of the perfluorooctyl ethyl methacrylate to the anhydrous formic acid is 10:1-1.5. As a further scheme of the invention, the mass ratio of the trimellitic anhydride to the epoxy perfluorooctyl ethyl methacrylate is 1:5-7, and the epoxy value of the epoxy perfluorooctyl ethyl methacrylate is 0.15-0.25mol/100g. As a further scheme of the invention, the mass fraction of fluorine element in the fluorine modified hyperbranched polyester precursor is 30% -45%, the hydroxyl value of the fluorine modified hyperbranched polyester precursor is 120-160mg KOH/g, and the mass ratio of the fluorine modified hyperbranched polyester precursor to the isobutyric anhydride is 10:3-4. The preparation method of the fluorine modified glass flake-silicon dioxide composite filler at least comprises the following steps: Adding glass flakes into a mixed solution of anhydrous ethanol and ammonia monohydrate, adding the mixed solution