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CN-122011846-A - Bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating and preparation method thereof

CN122011846ACN 122011846 ACN122011846 ACN 122011846ACN-122011846-A

Abstract

The invention relates to the technical field of coatings, in particular to a bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating and a preparation method thereof. The bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating comprises, by weight, 10-15 parts of epoxy resin, 52-60 parts of fluorocarbon resin, 4-6 parts of fluorine-containing polyol, 8-10 parts of filler, 50-60 parts of solvent and 7-10 parts of curing agent. The fluorocarbon coating prepared by the invention can be cured at low temperature, has higher hardness, and has excellent corrosion resistance and aging resistance.

Inventors

  • TANG YUKUAN
  • DING LIJUN

Assignees

  • 江苏振华造漆有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating is characterized by comprising, by weight, 10-15 parts of epoxy resin, 52-60 parts of fluorocarbon resin, 4-6 parts of fluorine-containing polyol, 8-10 parts of filler, 50-60 parts of solvent and 7-10 parts of curing agent.
  2. 2. The bio-based fluorine-containing polyol low temperature curing fluorocarbon coating as claimed in claim 1, wherein the preparation method of the fluorine-containing polyol comprises the following steps: (1) Adding hyaluronic acid into DMSO, stirring for 2-3h at 25-35 ℃, regulating the pH to 6.5-7, adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and 4-dimethylaminopyridine, stirring for 30-40min at room temperature, adding 4, 4-trifluorobutanol, reacting for 48-50h at 30-40 ℃, adding acrylic acid and a polymerization inhibitor under the protection of nitrogen, continuously reacting for 36-40h at 35-40 ℃, and carrying out post-treatment to obtain a product; (2) Adding castor oil and glycerol into a reaction kettle, adding a catalyst, replacing air in the reaction kettle with nitrogen, heating to 220-240 ℃, controlling the stirring speed to 300-500rpm, reacting for 4-6 hours, cooling to 70-80 ℃, adding deionized water for dilution, adjusting pH, washing, and distilling under reduced pressure to obtain castor oil polyol; (3) Adding the product obtained in the step (1), castor oil polyol and an initiator into a solvent, and reacting for 1-2h at 55-65 ℃ to obtain the fluorine-containing polyol.
  3. 3. The bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating as claimed in claim 2, wherein the mass ratio of the hyaluronic acid to the 4, 4-trifluorobutanol is 1 (3-5).
  4. 4. The bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating as claimed in claim 2, wherein the mass ratio of hyaluronic acid to acrylic acid is 1 (0.5-1).
  5. 5. The bio-based fluorine-containing polyol low temperature curing fluorocarbon coating as claimed in claim 2 wherein the mass ratio of castor oil polyol to product in step (3) is (3-4): 1.
  6. 6. The bio-based fluorine-containing polyol low temperature curing fluorocarbon coating of claim 1 wherein the filler is a mixture of titanium dioxide and fumed silica.
  7. 7. The bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating of claim 6 wherein the mass ratio of titanium pigment to fumed silica is 1 (3-5).
  8. 8. The bio-based fluorine-containing polyol low temperature curing fluorocarbon coating of claim 1 wherein the solvent is acetone.
  9. 9. The bio-based fluorine-containing polyol low temperature curing fluorocarbon coating of claim 1 wherein the curing agent is a polyisocyanate.
  10. 10. A method of preparing the bio-based fluorine-containing polyol low temperature curable fluorocarbon coating of any one of claims 1 to 9 comprising the steps of: Adding the epoxy resin and the filler into the solvent, stirring for 20-30min, adding the fluorocarbon resin, the polyol and the curing agent, and continuously stirring for 20-30min to obtain the fluorocarbon coating.

Description

Bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating and preparation method thereof Technical Field The invention relates to the technical field of coatings, in particular to a bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating and a preparation method thereof. Background Fluorocarbon paint is a kind of high performance paint with fluororesin as core film forming matter, and has excellent weather resistance, corrosion resistance, chemical resistance and self-cleaning performance owing to the unique electronegativity of fluorine atom and the high bond energy of C-F bond, and has become one kind of protecting and decorating material essential for aviation, marine engineering, building curtain wall, new energy equipment and other high end fields. In recent years, global industrial transformation upgrading and infrastructure construction are accelerated, the fluorocarbon coating market is driven to continuously expand, industrial data shows that the 2024 global fluorocarbon coating market size exceeds 350 hundred million yuan, china is taken as a main production and consumption country, the market ratio is more than 45%, and the demands are concentrated in the fields of high-end equipment protection, building energy conservation transformation and the like. Patent CN115058158B discloses a dihydroxyl hydrogenated rosin modified fluorocarbon anticorrosive paint and a preparation method thereof. The invention applies the renewable resource rosin derivative to fluorocarbon paint modification, reduces the raw material cost of fluorocarbon paint, has higher hardness and adhesive force, better corrosion resistance, heat resistance and artificial weathering resistance, further promotes the technical research of green bio-based fluorocarbon anti-corrosion paint, expands the application of fluorocarbon paint in ocean engineering and improves the technical level of ocean anti-corrosion paint in China. Patent CN119875442B discloses a fluorocarbon powder coating and a preparation method thereof, belonging to the technical field of powder coatings, and comprises the following steps of premixing methyl methacrylate, hydroxyethyl methacrylate, hexafluorobutyl methacrylate and p-methyl coumarate to obtain a premix; transferring the premixed solution to a reaction kettle, heating, adding an initiator, carrying out reaction, filtering and drying to obtain modified acrylic resin, carrying out melt mixing and extrusion to obtain a material A, putting PVDF fluorocarbon resin and a filler into the reaction kettle, heating, stirring to obtain a material B, adding the material A and modified PMMA, stirring, cooling and tabletting to obtain the powder coating. The fluorocarbon powder coating can maintain the advantage of high weather resistance, improve the internal compatibility and the ultraviolet resistance, and improve the internal bonding effect of the double-layer powder. Although the fluorocarbon coating has excellent performance, the prior art system still has a plurality of pain points to be broken through, the conventional fluorocarbon coating needs to be cured in a high-temperature environment of more than 150 ℃, so that the energy consumption is high, and the conventional fluorocarbon coating cannot be adapted to heat-sensitive substrates such as wood, plastic, foam and the like, thereby greatly limiting the expansion of the conventional fluorocarbon coating in the fields of furniture manufacturing, automobile interior decoration, lightweight parts and the like. There is therefore a need in the market for a fluorocarbon coating that is excellent in properties and can be cured at low temperatures. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to obtain the fluorocarbon coating, which not only has good mechanical strength, but also has good corrosion resistance, can be cured under the low-temperature condition, and has wide application range. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention provides a bio-based fluorine-containing polyol low-temperature curing fluorocarbon coating which comprises, by weight, 10-15 parts of epoxy resin, 52-60 parts of fluorocarbon resin, 4-6 parts of fluorine-containing polyol, 8-10 parts of filler, 50-60 parts of solvent and 7-10 parts of curing agent. In some embodiments, the method of preparing a fluorine-containing polyol comprises the steps of: (1) Adding hyaluronic acid into DMSO, stirring for 2-3h at 25-35 ℃, regulating the pH to 6.5-7, adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride and 4-dimethylaminopyridine, stirring for 30-40min at room temperature, adding 4, 4-trifluorobutanol, reacting for 48-50h at 30-40 ℃, adding acrylic acid and a polymerization inhibitor under the protection of nitrogen, continuously reacting for 36-40h at 35-40 ℃, and carrying out post-treatment to obtain a product; (2) Adding casto