CN117625010B - Super-hydrophobic powder coating, preparation method thereof and coating - Google Patents
Super-hydrophobic powder coating, preparation method thereof and coating Download PDFInfo
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- CN117625010B CN117625010B CN202311373996.6A CN202311373996A CN117625010B CN 117625010 B CN117625010 B CN 117625010B CN 202311373996 A CN202311373996 A CN 202311373996A CN 117625010 B CN117625010 B CN 117625010B
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- 238000000576 coating method Methods 0.000 title claims abstract description 92
- 239000011248 coating agent Substances 0.000 title claims abstract description 89
- 239000000843 powder Substances 0.000 title claims abstract description 65
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 159
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 98
- -1 perfluoroalkyl siloxane Chemical class 0.000 claims abstract description 58
- 239000003822 epoxy resin Substances 0.000 claims abstract description 44
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 44
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 34
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 125000005010 perfluoroalkyl group Chemical group 0.000 claims abstract description 22
- 239000000945 filler Substances 0.000 claims abstract description 17
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims description 29
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003960 organic solvent Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 230000004584 weight gain Effects 0.000 claims description 12
- 235000019786 weight gain Nutrition 0.000 claims description 12
- KZTYYGOKRVBIMI-UHFFFAOYSA-N diphenyl sulfone Chemical compound C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000000049 pigment Substances 0.000 claims description 10
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000004593 Epoxy Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 150000004985 diamines Chemical class 0.000 claims description 5
- FRWPIQAMIMYSPM-UHFFFAOYSA-N diethoxy-(8-fluorooctyl)-pentadecan-2-yloxysilane Chemical compound C(CCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCCF FRWPIQAMIMYSPM-UHFFFAOYSA-N 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- ULKLGIFJWFIQFF-UHFFFAOYSA-N 5K8XI641G3 Chemical compound CCC1=NC=C(C)N1 ULKLGIFJWFIQFF-UHFFFAOYSA-N 0.000 claims description 4
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 claims description 3
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 3
- HLPKYOCVWVMBMR-UHFFFAOYSA-N azane benzylbenzene Chemical compound N.N.C=1C=CC=CC=1CC1=CC=CC=C1 HLPKYOCVWVMBMR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- DIJRHOZMLZRNLM-UHFFFAOYSA-N dimethoxy-methyl-(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](C)(OC)CCC(F)(F)F DIJRHOZMLZRNLM-UHFFFAOYSA-N 0.000 claims description 3
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229940018564 m-phenylenediamine Drugs 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- CGUAVPURARJPSS-UHFFFAOYSA-N 10-fluorodecyl-dimethoxy-octadecoxysilane Chemical compound CCCCCCCCCCCCCCCCCCO[Si](OC)(OC)CCCCCCCCCCF CGUAVPURARJPSS-UHFFFAOYSA-N 0.000 claims description 2
- MUCUNSBITNLEHP-UHFFFAOYSA-N diethoxy-(10-fluorodecyl)-nonadecan-2-yloxysilane Chemical compound C(CCCCCCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCCCCF MUCUNSBITNLEHP-UHFFFAOYSA-N 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- 235000010216 calcium carbonate Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 230000002045 lasting effect Effects 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 8
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000009257 reactivity Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 125000003700 epoxy group Chemical group 0.000 description 5
- 125000001165 hydrophobic group Chemical group 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000012948 isocyanate Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- QWVGKYWNOKOFNN-UHFFFAOYSA-N o-cresol Chemical compound CC1=CC=CC=C1O QWVGKYWNOKOFNN-UHFFFAOYSA-N 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920003986 novolac Polymers 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 235000012222 talc Nutrition 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- KKYDYRWEUFJLER-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F KKYDYRWEUFJLER-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- KZUDODLIIRDHNH-UHFFFAOYSA-N C(CCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCC Chemical compound C(CCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCC KZUDODLIIRDHNH-UHFFFAOYSA-N 0.000 description 1
- MQJKPEGWNLWLTK-UHFFFAOYSA-N Dapsone Chemical compound C1=CC(N)=CC=C1S(=O)(=O)C1=CC=C(N)C=C1 MQJKPEGWNLWLTK-UHFFFAOYSA-N 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- ZZTCPWRAHWXWCH-UHFFFAOYSA-N diphenylmethanediamine Chemical compound C=1C=CC=CC=1C(N)(N)C1=CC=CC=C1 ZZTCPWRAHWXWCH-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- MLNCEQPFSFGNIW-UHFFFAOYSA-N heptadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCCC[Si](OC)(OC)OC MLNCEQPFSFGNIW-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004843 novolac epoxy resin Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- PMQIWLWDLURJOE-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F PMQIWLWDLURJOE-UHFFFAOYSA-N 0.000 description 1
- IJJXVFCJVQEXHZ-UHFFFAOYSA-N triethoxy(heptadecyl)silane Chemical compound CCCCCCCCCCCCCCCCC[Si](OCC)(OCC)OCC IJJXVFCJVQEXHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/04—Epoxynovolacs
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a super-hydrophobic powder coating, a preparation method and a coating thereof, wherein the super-hydrophobic powder coating comprises the following components in parts by weight: 50-60 parts of phenolic epoxy resin; 10-15 parts of curing agent; 15-20 parts of modified graphene oxide; 30-40 parts of filler; the modified graphene oxide surface is provided with perfluoroalkyl and isocyanate groups, and is obtained by modifying graphene oxide by perfluoroalkyl siloxane and then modifying the graphene oxide by a polyisocyanate compound. The super-hydrophobic powder coating has good lasting hydrophobicity and good adhesive force.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a super-hydrophobic powder coating, a preparation method thereof and a coating.
Background
The powder coating is a solid powdery coating material, generally contains solid resin and pigment, is different from common solvent-type coating, directly uses air as a medium to coat, for example, is sprayed on the surface of an object, and has the advantages of no pollution, fast film forming, low energy consumption and the like.
The powder coating can be divided into a thermosetting powder coating and a thermoplastic powder coating according to the film forming mode, the thermoplastic powder coating is adhered to the surface of an object after being melted, and the thermosetting powder coating can further undergo curing reaction after being melted and adhered to the surface of the object, so that the adhesive force to the object is better.
To prevent fouling of the coating surface, increasing the hydrophobicity of the coating is one aspect of the current coating requirements. However, the incorporation of superhydrophobic substances in powder coatings often faces the problem of reducing the adhesion of the powder coating.
Disclosure of Invention
In view of the shortcomings of the prior art, a first object of the present invention is to provide a superhydrophobic powder coating having good durable hydrophobicity and good adhesion.
In order to achieve the second purpose of the invention, the invention provides a preparation method of the super-hydrophobic powder coating, which is safe and environment-friendly and is easy to operate.
In order to achieve the third object of the invention, the invention provides a coating made of the super-hydrophobic powder coating, which is super-hydrophobic and has good adhesive force.
In order to achieve the first object of the invention, the invention provides a super-hydrophobic powder coating, which comprises the following components in parts by weight: 50-60 parts of phenolic epoxy resin; 10-15 parts of curing agent; 15-20 parts of modified graphene oxide; 30-40 parts of filler; the modified graphene oxide surface is provided with perfluoroalkyl and isocyanate groups, and is obtained by modifying graphene oxide by perfluoroalkyl siloxane and then modifying the graphene oxide by a polyisocyanate compound.
In some embodiments of the invention, the perfluoroalkyl siloxane is selected from at least one of trifluoropropyl methyl dimethoxy silane, tridecyl fluorooctyl triethoxy silane, heptadecyl fluorodecyl trimethoxy silane, heptadecyl fluorodecyl triethoxy silane.
In some embodiments of the present invention, the polyisocyanate compound is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate.
In some embodiments of the invention, the graphene oxide has an oxygen content of 35 to 40wt%.
In some embodiments of the invention, the phenolic epoxy resin has a molecular weight of 3000 to 4000 and an epoxy equivalent weight of 170 to 180g/eq.
In some embodiments of the invention, the curing agent is at least one of diamino diphenyl sulfone, diamino diphenyl methane, m-phenylenediamine, benzyl dimethylamine, 2-methylimidazole, 2-ethyl-4-methylimidazole.
In some embodiments of the invention, the superhydrophobic powder coating also includes 1-10 parts of pigment.
In some embodiments of the invention, the filler is selected from at least one of silica, calcium carbonate, talc, barium sulfate.
In some embodiments of the invention, the graphene oxide is modified with perfluoroalkyl siloxane to gain 35-40 wt% of the original graphene oxide mass, and modified with polyisocyanate compound to gain 50-65 wt% of the original graphene oxide mass.
To achieve the second object of the present invention, the present invention provides a method for preparing the superhydrophobic powder coating according to any one of the above schemes, comprising the steps of:
Ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic vibration reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is (3-5): 1, a step of; washing the graphene oxide modified by perfluoroalkyl siloxane with water, drying, dispersing the graphene oxide and polyisocyanate compound into an organic solvent, carrying out ultrasonic vibration reaction, and filtering and drying after the reaction is finished to obtain modified graphite oxide;
and uniformly dispersing the phenolic epoxy resin, the curing agent and the modified graphene oxide, extruding, cooling and granulating to obtain the powder coating.
In some embodiments of the invention, the ratio of the volume of the ethanol-water solution to the mass of the graphene oxide is (5-8) mL/mg.
In some embodiments of the invention, the organic solvent is at least one of toluene, xylene, cyclohexanone, dimethyl sulfoxide, dimethylformamide.
In some embodiments of the invention, the extrusion temperature is 40-50 ℃.
To achieve the third object of the present invention, the present invention provides a coating layer prepared from a superhydrophobic powder coating according to any one of the above-mentioned aspects or a superhydrophobic powder coating prepared by a preparation method according to any one of the above-mentioned aspects.
Compared with the prior art, the invention has the following beneficial effects:
According to the super-hydrophobic powder coating provided by the invention, the modified graphene oxide is adopted, active groups on the surface of the graphene oxide react with perfluoroalkyl siloxane and then react with isocyanate compounds to obtain the graphene oxide with perfluoroalkyl and isocyanate groups on the surface, the perfluoroalkyl is matched with flaky graphene oxide, the surface of the coating can be enriched when the super-hydrophobic powder coating is fused and solidified, the super-hydrophobicity of the surface of the coating is improved, and meanwhile, the isocyanate groups can react with epoxy resin to firmly combine the modified graphene oxide into a resin matrix of the coating, so that the super-hydrophobic substance is prevented from being easily separated from the coating, and the super-hydrophobic durability is improved. And a large amount of epoxy groups in the isocyanate groups and the phenolic epoxy resin can improve the adhesive force of the coating.
Detailed Description
The embodiment of the invention provides a super-hydrophobic powder coating which is solid powder coating and can be sprayed on the surfaces of various different materials such as metal, wood, plastic, ceramic, wall and the like to play a role in protecting super-hydrophobic dirt resistance.
Specifically, the super-hydrophobic powder coating comprises the following components in parts by weight: 50-60 parts of phenolic epoxy resin; 10-15 parts of curing agent; 15-20 parts of modified graphene oxide; 30-40 parts of filler.
The phenolic epoxy resin can be linear phenol type phenolic epoxy resin or o-cresol type phenolic epoxy resin, and the preparation process generally comprises the steps of carrying out polycondensation reaction on phenol or o-cresol and formaldehyde to obtain the phenolic novolak resin, and carrying out polycondensation reaction on the phenolic novolak resin and excessive propylene oxide in the presence of sodium hydroxide to enable epoxy groups to be connected to the phenolic novolak resin. Compared with the common bisphenol epoxy resin, the phenolic epoxy resin has high epoxy group content, high viscosity and even solid state, and the cured product has high crosslinking density, good compactness, good mechanical property and good heat resistance. In the present invention, the phenolic epoxy resin may be used in an amount of 50 to 60 parts, for example, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, etc., as the main resin component.
The curing agent can be the existing amine curing agent, anhydride curing agent, isocyanate curing agent and the like, preferably the curing agent with medium reaction speed, avoids the excessive curing of the epoxy resin in the preparation process of the powder coating, and is convenient for the curing of the epoxy resin after coating. The amount of the curing agent to be used is 10 to 15 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc., for sufficiently reactive curing of the epoxy resin.
The modified graphene oxide is modified graphene oxide with perfluoroalkyl and isocyanate groups on the surface, the surface of the modified graphene oxide is provided with hydrophobic groups and reactive groups, the perfluoroalkyl can be used as the hydrophobic groups to greatly improve the hydrophobicity of the graphene oxide, the perfluoroalkyl is matched with basically lamellar graphene oxide and the like with certain barrier property to realize superhydrophobicity, and the perfluoroalkyl tends to be enriched on the surface of a coating in the process of melt spraying due to poor compatibility of the perfluoroalkyl and polar epoxy resin, so that the surface hydrophobicity is improved. Meanwhile, the isocyanate group is used as a reactive group, has larger reactivity, can participate in the curing reaction of epoxy resin, improves the dispersion uniformity of modified graphene oxide in a coating matrix, improves the hydrophobic durability, can be combined with the reactive group on the surface of a coated object, and improves the adhesive force of the resin matrix. Moreover, the modified graphene oxide has perfluoroalkyl and isocyanate groups, so that the phenomenon that graphene oxide is easy to agglomerate and the adhesive force of resin is influenced due to the fact that only a single hydrophobic group exists on the modified graphene oxide is avoided. The modified graphene oxide is obtained by modifying graphene oxide by perfluoroalkyl siloxane and then modifying the modified graphene oxide by polyisocyanate compound, wherein perfluoroalkyl siloxane is added to react with active groups of the graphene oxide such as hydroxyl groups and carboxyl groups, the siloxane can react and crosslink, hydrophobic groups are introduced, and then the polyisocyanate compound with high reactivity is added to react with the active groups of the graphene oxide such as epoxy groups, residual hydroxyl groups and carboxyl groups and hydroxyl groups introduced by the siloxane to connect isocyanate groups. In this embodiment, the amount of the modified graphene oxide is 15 to 20 parts, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc., to provide sufficient hydrophobic properties.
The filler may be of the existing filler type, and may be of the micro-or nano-scale. The filler can improve the powder state stability of the powder coating, improve the mechanical property of a resin matrix and reduce the cost. In this embodiment, the amount of the filler is 30 to 40 parts, and for example, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, and the like can be used.
In some examples, the perfluoroalkyl siloxane is selected from at least one of trifluoropropyl methyl dimethoxy silane, tridecyl octyl triethoxy silane, heptadecyl trimethoxy silane, heptadecyl triethoxy silane, which is readily available as a starting material and has good hydrophobicity and reactivity.
In some examples, the polyisocyanate compound is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, which has good reactivity and has a ring in the molecule, and has good compatibility with both graphene oxide and novolac epoxy resin, and is convenient for the isocyanate group to react with the functional group on the graphene oxide and react with the epoxy resin.
In some examples, the oxygen content of the graphene oxide is 35-40 wt%, the graphene oxide has a high degree of oxidation, and the graphene oxide is capable of linking a large amount of perfluoroalkyl siloxane and polyisocyanate compounds, improving the hydrophobicity and reactivity of the graphene oxide.
In some examples, the molecular weight of the phenolic epoxy resin is 3000 to 4000, which may be a number average molecular weight, and the phenolic epoxy resin may be solid or semi-solid at ambient temperature to facilitate the formation of a stable powder coating. The epoxy equivalent of the phenolic epoxy resin is 170-180 g/eq, and the phenolic epoxy resin has a large amount of epoxy groups, so that the mechanical strength and the adhesive force of the phenolic epoxy resin are improved.
In some examples, the curing agent is at least one of diamine diphenyl sulfone, diamine diphenyl methane, m-phenylenediamine, benzyl dimethylamine, 2-methylimidazole, 2-ethyl-4-methylimidazole, which has moderate reactivity with the epoxy resin, avoids excessive curing of the epoxy resin during the preparation of the powder coating, and facilitates curing of the epoxy resin after application.
In some examples, the superhydrophobic powder coating also includes 1-10 parts of pigment, which can be, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc., imparting color to the coating. The super-hydrophobic powder coating can be composed of phenolic epoxy resin, a curing agent, modified graphene oxide, a filler and a pigment. In other examples, the superhydrophobic powder coating can also contain other additives.
In some examples, the filler is selected from at least one of silica, calcium carbonate, talc, barium sulfate, which are readily available as raw materials and can improve powder morphology stability.
In some examples, the graphene oxide is weight-increased by 35 to 40wt%, e.g., 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, etc., of the original mass of graphene oxide after modification with the perfluoroalkyl siloxane, thereby introducing sufficient perfluoroalkyl groups to provide sufficient hydrophobicity. The weight gain of the modified graphene oxide of perfluoroalkyl siloxane after being modified by the polyisocyanate compound is 50-65 wt%, such as 50wt%, 51wt%, 52wt%, 53wt%, 54wt%, 55wt%, 56wt%, 57wt%, 58wt%, 59wt%, 60wt%, 61wt%, 62wt%, 63wt%, 64wt%, 65wt% and so on. The amount of perfluoroalkyl group or polyisocyanate compound to be introduced can be adjusted by adjusting the amount of perfluoroalkyl siloxane or polyisocyanate compound, the reaction conditions, etc.
In some examples, the preparation method of the super-hydrophobic powder coating comprises the following steps:
Step one, preparing modified graphene oxide: ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is (3-5): 1, for example 3: 1. 4: 1.5: 1, and the like, ethanol can promote the dissolution of perfluoroalkyl siloxane, water can promote the hydrolysis of siloxane groups, and graphene oxide is uniformly dispersed by adopting an ultrasonic vibration mode to fully react with the perfluoroalkyl siloxane. And then washing the graphene oxide modified by the perfluoroalkyl siloxane with water, drying, removing excessive solvents such as perfluoroalkyl siloxane, ethanol and the like, dispersing the perfluoroalkyl siloxane and the ethanol into an organic solvent with a polyisocyanate compound, and carrying out ultrasonic vibration reaction to ensure that the isocyanate group of the polyisocyanate compound can be fully reacted with active groups on the graphene oxide and siloxane molecular chains. The preparation method is safe, simple, environment-friendly and easy to operate. And filtering and drying after the reaction is finished to remove the organic solvent, excessive polyisocyanate and the like, thereby obtaining the modified graphite oxide.
Preparing a powder coating: and uniformly dispersing the phenolic epoxy resin, the curing agent and the modified graphene oxide, extruding, cooling and granulating to obtain the powder coating.
In some examples, the ratio of the volume of ethanol-water solution to the mass of graphene oxide is (5-8) mL/mg, providing sufficient solution to aid in the dispersion of the reactants.
In some examples, the organic solvent is at least one of toluene, xylene, cyclohexanone, dimethyl sulfoxide, dimethylformamide, and the organic solvent may be recycled multiple times.
In some examples, the extrusion temperature is from 40 to 50 ℃ so that the phenolic epoxy resin can soften or melt, facilitate extrusion, and not so much so that the phenolic epoxy resin is overly crosslinked with the curing agent, it being understood that partial curing reaction of the epoxy resin with the curing agent is not precluded during extrusion.
In some examples, the present embodiment also provides a coating layer, which is prepared from the above-mentioned superhydrophobic powder coating or the superhydrophobic powder coating prepared by the above-mentioned preparation method by spraying or the like, and the superhydrophobic powder coating is melted and solidified during the spraying process.
The present invention will be described in further detail by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
The preparation method of the super-hydrophobic powder coating comprises the following steps:
Preparation of modified graphene oxide: preparing graphene oxide with an oxygen content of 35wt% and perfluoroalkyl siloxane tridecyl fluorooctyl triethoxy silane, wherein the mass ratio of the graphene oxide to the perfluoroalkyl siloxane is 1:0.6. ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is 3:1, the ratio of the volume consumption of the ethanol-water solution to the mass of the graphene oxide is 5mL/mg, the graphene oxide modified by the perfluoroalkyl siloxane is washed by water and then dried, and the weight of the modified graphene oxide is weighed, so that the weight gain of the graphene oxide modified by the perfluoroalkyl siloxane is 35wt% of the original mass of the graphene oxide. Dispersing the graphene oxide modified by perfluoroalkyl siloxane and polyisocyanate compound toluene diisocyanate into organic solvent toluene for ultrasonic oscillation reaction, wherein the mass ratio of the graphene oxide to the polyisocyanate compound is 1:1. and filtering and drying after the reaction is finished to obtain modified graphite oxide, and weighing the weight of the modified graphene oxide, wherein the weight gain of the polyisocyanate compound modification step is 65 weight percent of the original weight of the graphene oxide. The surface of the obtained modified graphene oxide has perfluoroalkyl and isocyanate groups.
Preparing the super-hydrophobic powder coating: the raw materials of 60 parts of phenolic epoxy resin (with the molecular weight of about 3000 and the epoxy equivalent of about 172 g/eq), 15 parts of curing agent diamine diphenyl sulfone, 15 parts of modified graphene oxide, 35 parts of filler silicon dioxide and 1 part of pigment are weighed, the phenolic epoxy resin, the curing agent and the modified graphene oxide are uniformly dispersed, extruded at 50 ℃, cooled and granulated to obtain the powder coating.
Example 2
The preparation method of the super-hydrophobic powder coating comprises the following steps:
Preparation of modified graphene oxide: preparing graphene oxide with an oxygen content of 40wt% and perfluoroalkyl siloxane heptadecafluorodecyl trimethoxy silane, wherein the mass ratio of the graphene oxide to the perfluoroalkyl siloxane is 1:1. ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is 5:1, the ratio of the volume consumption of the ethanol-water solution to the mass of the graphene oxide is 8mL/mg, the graphene oxide modified by the perfluoroalkyl siloxane is washed by water and then dried, and the weight of the modified graphene oxide is weighed, so that the weight gain of the graphene oxide modified by the perfluoroalkyl siloxane is 40wt% of the original mass of the graphene oxide. Dispersing the graphene oxide modified by perfluoroalkyl siloxane and a polyisocyanate compound isophorone diisocyanate into cyclohexanone serving as an organic solvent for ultrasonic oscillation reaction, wherein the mass ratio of the graphene oxide to the polyisocyanate compound is 1:0.75. and filtering and drying after the reaction is finished to obtain modified graphite oxide, and weighing the weight of the modified graphene oxide, wherein the weight gain of the polyisocyanate compound modification step is 50wt% of the original weight of the graphene oxide. The surface of the obtained modified graphene oxide has perfluoroalkyl and isocyanate groups.
Preparing the super-hydrophobic powder coating: the raw materials of 50 parts of phenolic epoxy resin (with the molecular weight of about 3000, the epoxy equivalent of 172 g/eq), 10 parts of curing agent diamine diphenyl methane, 20 parts of modified graphene oxide, 30 parts of filler barium sulfate and 1 part of pigment are weighed, the phenolic epoxy resin, the curing agent and the modified graphene oxide are uniformly dispersed, extruded at 45 ℃, cooled and granulated to obtain the powder coating.
Example 3
The preparation method of the super-hydrophobic powder coating comprises the following steps:
Preparation of modified graphene oxide: preparing graphene oxide with an oxygen content of 35-40 wt% and perfluoroalkyl siloxane heptadecafluorodecyl triethoxysilane, wherein the mass ratio of the graphene oxide to the perfluoroalkyl siloxane is 1:0.8. ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is 4:1, the ratio of the volume consumption of the ethanol-water solution to the mass of the graphene oxide is 8mL/mg, the graphene oxide modified by the perfluoroalkyl siloxane is washed by water and then dried, and the weight of the modified graphene oxide is weighed, so that the weight gain of the graphene oxide modified by the perfluoroalkyl siloxane is 38wt% of the original mass of the graphene oxide. Dispersing the graphene oxide modified by perfluoroalkyl siloxane and a polyisocyanate compound dicyclohexylmethane diisocyanate into an organic solvent dimethyl sulfoxide for ultrasonic oscillation reaction, wherein the mass ratio of the graphene oxide to the polyisocyanate compound is 1:1. and filtering and drying after the reaction is finished to obtain modified graphite oxide, and weighing the weight of the modified graphene oxide, wherein the weight gain of the polyisocyanate compound modification step is 60 weight percent of the original weight of the graphene oxide. The surface of the obtained modified graphene oxide has perfluoroalkyl and isocyanate groups.
Preparing the super-hydrophobic powder coating: weighing 60 parts of phenolic epoxy resin (with the molecular weight of about 3000 and the epoxy equivalent of about 172 g/eq), 10 parts of curing agent 2-ethyl-4-methylimidazole, 20 parts of modified graphene oxide, 30 parts of filler talcum powder and 1 part of pigment, uniformly dispersing the phenolic epoxy resin, the curing agent and the modified graphene oxide, extruding at 40 ℃, cooling and granulating to obtain the powder coating.
Example 4
In this example, the graphene oxide was not modified with the polyisocyanate compound as in example 1, and the resin type was different.
The preparation method of the powder coating comprises the following steps:
Preparation of modified graphene oxide: preparing graphene oxide with an oxygen content of 35wt% and perfluoroalkyl siloxane tridecyl fluorooctyl triethoxy silane, wherein the mass ratio of the graphene oxide to the perfluoroalkyl siloxane is 1:1.5. ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is 3:1, the ratio of the volume consumption of the ethanol-water solution to the mass of the graphene oxide is 5mL/mg, the graphene oxide modified by the perfluoroalkyl siloxane is washed by water and then dried, and the weight of the modified graphene oxide is weighed, so that the weight gain of the graphene oxide modified by the perfluoroalkyl siloxane is about 63wt% of the original mass of the graphene oxide.
Preparing the super-hydrophobic powder coating: weighing raw materials according to the weight of bisphenol A epoxy resin E-20 parts, curing agent diamine diphenyl sulfone 15 parts, modified graphene oxide 15 parts, filler silicon dioxide 35 parts and pigment 1 part, uniformly dispersing phenolic epoxy resin, curing agent and modified graphene oxide, extruding at 50 ℃, cooling and granulating to obtain the powder coating.
Example 5
The amount of the perfluoroalkyl siloxane and polyisocyanate compound used in this example was different from that in example 1.
The preparation method of the powder coating comprises the following steps:
Preparation of modified graphene oxide: preparing graphene oxide with an oxygen content of 35wt% and perfluoroalkyl siloxane tridecyl fluorooctyl triethoxy silane, wherein the mass ratio of the graphene oxide to the perfluoroalkyl siloxane is 1:1.2. ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic oscillation reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is 8:1, the ratio of the volume consumption of the ethanol-water solution to the mass of the graphene oxide is 10mL/mg, the graphene oxide modified by the perfluoroalkyl siloxane is washed by water and then dried, and the weight of the modified graphene oxide is weighed, so that the weight gain of the graphene oxide modified by the perfluoroalkyl siloxane is 57wt% of the original mass of the graphene oxide. Dispersing the graphene oxide modified by perfluoroalkyl siloxane and polyisocyanate compound toluene diisocyanate into organic solvent toluene for ultrasonic oscillation reaction, wherein the mass ratio of the graphene oxide to the polyisocyanate compound is 1:0.5. and filtering and drying after the reaction is finished to obtain modified graphite oxide, and weighing the weight of the modified graphene oxide, wherein the weight gain of the polyisocyanate compound modification step is 35wt% of the original weight of the graphene oxide. The surface of the obtained modified graphene oxide has perfluoroalkyl and isocyanate groups.
Preparing the super-hydrophobic powder coating: the raw materials of 60 parts of phenolic epoxy resin (with the molecular weight of about 3000 and the epoxy equivalent of about 172 g/eq), 15 parts of curing agent diamine diphenyl sulfone, 15 parts of modified graphene oxide, 35 parts of filler silicon dioxide and 1 part of pigment are weighed, the phenolic epoxy resin, the curing agent and the modified graphene oxide are uniformly dispersed, extruded at 50 ℃, cooled and granulated to obtain the powder coating.
The coatings obtained in examples 1 to 5 above were each prepared to a thickness of 1mm on a metal substrate. The adhesion test was performed on the coating according to GB/T9286-1998 and the water contact angle test was performed on the coating according to GB/T30693-2014. After the coating is subjected to dry friction for 500 times by adopting friction cloth, the water contact angle test is performed. The test results are shown in table 1 below.
Table 1 test results
From the above, the examples 1 to 3 of the present invention have good adhesion to metal substrates, the coating is not easy to fall off, and the coating has good superhydrophobicity both initially and after friction, and the coating can still maintain superhydrophobicity after long-term use. Example 5 the ratio of perfluoroalkyl siloxane to isocyanate was less than optimal and the adhesion and water contact angle after rubbing were slightly worse. The graphene oxide of example 4 was not modified with isocyanate, and a large number of hydrophobic groups attached to the graphene oxide affected the adhesion of the coating, reducing the hydrophobic durability.
Finally, it should be emphasized that the above description is merely of a preferred embodiment of the invention, and is not intended to limit the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The super-hydrophobic powder coating is characterized by comprising the following components in parts by weight:
50-60 parts of phenolic epoxy resin;
10-15 parts of curing agent;
15-20 parts of modified graphene oxide;
30-40 parts of filler;
the modified graphene oxide surface is provided with perfluoroalkyl and isocyanate groups, and is obtained by modifying graphene oxide by perfluoroalkyl siloxane and then modifying the graphene oxide by a polyisocyanate compound;
The perfluoroalkyl siloxane is at least one selected from trifluoropropyl methyl dimethoxy silane, tridecyl fluorooctyl triethoxy silane, heptadecyl fluorodecyl trimethoxy silane and heptadecyl fluorodecyl triethoxy silane;
The polyisocyanate compound is at least one selected from toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate and dicyclohexylmethane diisocyanate;
The weight gain of the graphene oxide modified by perfluoroalkyl siloxane is 35-40 wt% of the original mass of the graphene oxide, and the weight gain of the graphene oxide modified by the polyisocyanate compound is 50-65 wt% of the original mass of the graphene oxide;
The oxygen content of the graphene oxide is 35-40 wt%;
The molecular weight of the phenolic epoxy resin is 3000-4000, and the epoxy equivalent is 170-180 g/eq;
The curing agent is at least one of diamine diphenyl sulfone, diamine diphenyl methane, m-phenylenediamine, benzyl dimethylamine, 2-methylimidazole and 2-ethyl-4-methylimidazole;
The preparation method of the modified graphene oxide comprises the following steps: ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic vibration reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is (3-5): 1, a step of; washing the graphene oxide modified by the perfluoroalkyl siloxane with water, drying, dispersing the graphene oxide and the polyisocyanate compound into an organic solvent, carrying out ultrasonic vibration reaction, and filtering and drying after the reaction is finished to obtain the modified graphene oxide.
2. A superhydrophobic powder coating according to claim 1, characterized in that the superhydrophobic powder coating further comprises 1-10 parts of pigment;
The filler is at least one selected from silicon dioxide, calcium carbonate, talcum powder and barium sulfate.
3. The method for preparing the super-hydrophobic powder coating according to claim 1 or 2, which is characterized by comprising the following steps:
Ultrasonically dispersing graphene oxide and perfluoroalkyl siloxane in an ethanol-water solution, and performing ultrasonic vibration reaction at normal temperature, wherein the volume ratio of ethanol to water in the ethanol-water solution is (3-5): 1, a step of; washing the graphene oxide modified by perfluoroalkyl siloxane with water, drying, dispersing the graphene oxide and polyisocyanate compound into an organic solvent, carrying out ultrasonic vibration reaction, and filtering and drying after the reaction is finished to obtain modified graphene oxide;
and uniformly dispersing the phenolic epoxy resin, the curing agent and the modified graphene oxide, extruding, cooling and granulating to obtain the powder coating.
4. The preparation method according to claim 3, characterized in that the ratio of the volume usage of the ethanol-water solution to the mass of the graphene oxide is 5 to 8mL/mg;
The organic solvent is at least one of toluene, xylene, cyclohexanone, dimethyl sulfoxide and dimethylformamide.
5. A process according to claim 3, characterized in that the extrusion temperature is 40-50 ℃.
6. A coating, characterized in that it is produced from a superhydrophobic powder coating according to claim 1 or 2 or from a superhydrophobic powder coating produced by a production process according to any one of claims 3 to 5.
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