CN109054632B - Water-resistant weather-resistant composite powder coating and preparation method thereof - Google Patents
Water-resistant weather-resistant composite powder coating and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 58
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003822 epoxy resin Substances 0.000 claims abstract description 45
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 45
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 31
- 239000010703 silicon Substances 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical class N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 10
- 238000005260 corrosion Methods 0.000 claims abstract description 10
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000049 pigment Substances 0.000 claims abstract description 8
- 239000004640 Melamine resin Substances 0.000 claims abstract description 7
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 7
- 239000003112 inhibitor Substances 0.000 claims abstract description 5
- 239000012745 toughening agent Substances 0.000 claims abstract description 5
- 239000004593 Epoxy Substances 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 238000004821 distillation Methods 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000012768 molten material Substances 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000012043 crude product Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 229910052697 platinum Inorganic materials 0.000 claims description 10
- 238000006068 polycondensation reaction Methods 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 claims description 6
- 230000002194 synthesizing effect Effects 0.000 claims description 6
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 6
- KWEKXPWNFQBJAY-UHFFFAOYSA-N (dimethyl-$l^{3}-silanyl)oxy-dimethylsilicon Chemical compound C[Si](C)O[Si](C)C KWEKXPWNFQBJAY-UHFFFAOYSA-N 0.000 claims description 5
- ULKLGIFJWFIQFF-UHFFFAOYSA-N 5K8XI641G3 Chemical group CCC1=NC=C(C)N1 ULKLGIFJWFIQFF-UHFFFAOYSA-N 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- 239000003085 diluting agent Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 claims description 4
- 239000003377 acid catalyst Substances 0.000 claims description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 4
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 claims description 4
- WUIQPLSONDMSBW-UHFFFAOYSA-N 2-[1-(oxiran-2-ylmethoxy)butan-2-yloxymethyl]oxirane Chemical compound C1OC1COC(CC)COCC1CO1 WUIQPLSONDMSBW-UHFFFAOYSA-N 0.000 claims description 3
- XXKPOBUURXHXFM-UHFFFAOYSA-N 2-[[3-ethenyl-5-(oxiran-2-ylmethoxy)phenoxy]methyl]oxirane Chemical compound C=1C(OCC2OC2)=CC(C=C)=CC=1OCC1CO1 XXKPOBUURXHXFM-UHFFFAOYSA-N 0.000 claims description 3
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012964 benzotriazole Substances 0.000 claims description 3
- NRTSLUOVGBFANI-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) 2-methylidenebutanedioate Chemical compound C1OC1COC(=O)C(=C)CC(=O)OCC1CO1 NRTSLUOVGBFANI-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229920006375 polyphtalamide Polymers 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 claims description 3
- SHKUUQIDMUMQQK-UHFFFAOYSA-N 2-[4-(oxiran-2-ylmethoxy)butoxymethyl]oxirane Chemical compound C1OC1COCCCCOCC1CO1 SHKUUQIDMUMQQK-UHFFFAOYSA-N 0.000 claims description 2
- CMGDVUCDZOBDNL-UHFFFAOYSA-N 4-methyl-2h-benzotriazole Chemical compound CC1=CC=CC2=NNN=C12 CMGDVUCDZOBDNL-UHFFFAOYSA-N 0.000 claims description 2
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims description 2
- 229910001863 barium hydroxide Inorganic materials 0.000 claims description 2
- MLVSWIXRZNPEKF-UPHRSURJSA-N bis(oxiran-2-ylmethyl) (z)-but-2-enedioate Chemical compound C1OC1COC(=O)\C=C/C(=O)OCC1CO1 MLVSWIXRZNPEKF-UPHRSURJSA-N 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 238000006735 epoxidation reaction Methods 0.000 claims description 2
- 150000007529 inorganic bases Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- -1 poly (hexamethylene diamine terephthalate amide Chemical class 0.000 claims description 2
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 5
- 239000011347 resin Substances 0.000 abstract description 5
- 239000006087 Silane Coupling Agent Substances 0.000 abstract description 3
- 235000010215 titanium dioxide Nutrition 0.000 abstract 1
- 239000004408 titanium dioxide Substances 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000004954 Polyphthalamide Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 239000004843 novolac epoxy resin Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004383 yellowing Methods 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- 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
- 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
- C09D5/08—Anti-corrosive paints
-
- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a water-resistant weather-resistant composite powder coating and a preparation method thereof, wherein the water-resistant weather-resistant composite powder coating comprises the following components in parts by weight: 45-60 parts of organic silicon epoxy resin, 15-20 parts of melamine resin, 0.5-1.5 parts of curing accelerator, 5-10 parts of toughening agent, 2-3 parts of organic silicon leveling agent, 2-3 parts of corrosion inhibitor, 3-6 parts of KH550 modified silicon nitride powder, 8-12 parts of KH550 modified titanium dioxide and 0-5 parts of pigment and filler. The invention has the advantages that: the main resin body adopts organic silicon epoxy resin, and the defect of poor weather resistance of the epoxy resin is overcome on the resin; meanwhile, the filler main body adopts silane coupling agent KH550 modified silicon nitride powder and titanium white powder, so that the water resistance is better.
Description
Technical Field
The invention relates to a powder coating, in particular to a water-resistant weather-resistant composite powder coating and a preparation method thereof, belonging to the technical field of corrosion prevention.
Background
Epoxy resin powder coating is composed of epoxy resin, curing agent, pigment, filler and assistant in general, because of its strong adhesion, high temperature resistance and excellent electric insulation property. The epoxy resin is a base material in powder coating and is an important film-forming substance; the curing agent reacts with the epoxy resin to enable the epoxy resin to be polymerized and crosslinked, and is an indispensable component in the powder coating; the pigment, the filler and the auxiliary agent are important components in the formula of the epoxy powder coating, and the addition of the pigment, the filler and the auxiliary agent can effectively improve the physical and chemical properties of the epoxy powder coating. The good filler plays a role of a skeleton in the powder coating, enhances the performance of a coating film, can also reduce the production cost of the powder coating, and can also improve the powder coating rate, the spraying area and the like of the powder.
The existing epoxy resin powder coating generally adopts bisphenol A epoxy resin as basic resin, and has the defects of poor ultraviolet resistance, poor weather resistance and easy yellowing. For example, the Chinese patent CN201310551762.6 low-temperature fast curing epoxy powder coating comprises the following components in percentage by weight: 45-65% of epoxy resin, 1-5% of multi-epoxy active cross-linking agent, 8-18% of curing agent, 0.1-0.5% of curing accelerator, 4-30% of precipitated barium sulfate, 4-8% of mica powder, 2-5% of titanium dioxide, 0.5-1.0% of adhesion promoter and auxiliary agent. The epoxy powder coating disclosed by the invention adopts a resin system formed by blending high-molecular-weight bisphenol A epoxy resin and novolac epoxy resin, and after the epoxy powder coating is cured by a curing agent, an obtained paint film has the advantages of strong adhesive force and good alkali resistance of the epoxy resin, and has the characteristics of excellent water resistance, solvent resistance and acid resistance of the novolac resin, and the heat resistance of the paint film is good.
The weather resistance of epoxy powder coating is improved by adding antioxidant, ultraviolet absorbent and the like in the prior art, but the additives are easy to free, and the coating has the defect of not lasting weather resistance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a water-resistant weather-resistant composite powder coating and a preparation method thereof.
The invention adopts the following technical scheme that a water-resistant weather-resistant composite powder coating and a preparation method thereof comprise the following components in parts by weight: 45-60 parts of organic silicon epoxy resin, 15-20 parts of melamine resin, 0.5-1.5 parts of curing accelerator, 5-10 parts of toughening agent, 2-3 parts of organic silicon leveling agent, 2-3 parts of corrosion inhibitor, 3-6 parts of KH550 modified silicon nitride powder, 8-12 parts of KH550 modified titanium dioxide, 0-5 parts of other pigments and fillers except the KH550 modified silicon nitride powder and the KH550 modified titanium dioxide.
The preparation method of the organic silicon epoxy resin comprises the following steps:
(1) synthesizing organic silicon epoxy micromolecules: 2 parts by mole of 1,1,3, 3-tetramethyldisiloxane, 5X 10 in terms of metal platinum, was charged into the reactor under nitrogen-4-10×10-4Heating to 50-80 ℃ after the platinum catalyst and the toluene in molar parts are added in molar parts, slowly dropwise adding an epoxidation reagent in 1 molar part into the mixture, after the dropwise adding is finished for 0.5-1h, continuing to perform heat preservation reaction for 1-2h after the dropwise adding is finished, then adding ethanol in 1 molar part into a reaction device, continuing to perform heat preservation reaction for 1-2h, and performing reduced pressure distillation to remove the diluent, thus obtaining the organosilicon epoxy micromolecule.
(2) And (3) synthesis of organic silicon epoxy resin: adding 35 weight parts of ethyl orthosilicate, 5-6 weight parts of methyltriethoxysilane, 5-6 weight parts of (1) medium organosilicon epoxy micromolecule and 15-20 weight parts of dimethylbenzene into a reactor, heating to 50-60 ℃, then slowly dripping 1-2 parts by weight of acid catalyst and 8-14 parts by weight of deionized water into the reactor through different feed inlets respectively, after finishing dripping for 0.5-1h, keeping the temperature for continuous reaction for 4-6 h, adding inorganic base into the reactor to adjust the pH to 8-9, then heating the reactor to 90-95 ℃, carrying out reduced pressure distillation for carrying out polycondensation reaction for 1.5-2h, adding 1-2 parts by weight of anhydrous calcium chloride, heating to 115-125 ℃, and continuing reduced pressure distillation for carrying out polycondensation reaction for 3-4h, namely obtaining the crude product of the organosilicon epoxy resin; washing the crude product with deionized water to neutrality, and vacuum drying to obtain the organosilicon epoxy resin.
The curing accelerator is 2-ethyl-4-methylimidazole.
The toughening agent is at least one of poly (tetramethylene diamine adipic acid amide), poly (hexamethylene diamine terephthalate amide) and poly (phthalamide).
The corrosion inhibitor is at least one of mercaptobenzothiazole, quinoline, methylbenzotriazole, benzotriazole and sodium lignosulfonate.
The epoxidizing agent is at least one of itaconic acid diglycidyl ester, maleic acid diglycidyl ester, 1, 4-butylene glycol diglycidyl ether, 3, 4-butylene glycol diglycidyl ether and 5-vinyl-1, 3-benzenediol diglycidyl ether.
The acid catalyst is at least one of concentrated hydrochloric acid, p-toluenesulfonic acid, concentrated sulfuric acid and trifluoromethanesulfonic acid.
The inorganic alkali is at least one of sodium hydroxide, potassium hydroxide and barium hydroxide.
The preparation method of the powder coating comprises the following steps: the waterproof and weather-resistant composite powder coating is fully and uniformly mixed in a mixing device according to the formula composition; then melt-extruding through a screw extruder, and controlling the temperature of a feeding section to be 60 ℃, the temperature of a melting section to be 80 ℃ and the temperature of a discharging section to be 100 ℃; and tabletting the molten material by a tabletting machine, controlling the thickness to be 2-3mm, crushing the molten material, feeding the crushed molten material into a grinding mill for crushing, and sieving the crushed molten material by a 200-mesh sieve to obtain the water-resistant and corrosion-resistant epoxy resin powder coating.
Compared with the prior art, the invention has the advantages that: (1) by synthesizing organosilicon epoxy resinsMolecules, and further organosilicon epoxy resin which takes a siloxane bond as a framework and takes an epoxy group and methyl as side chains is synthesized for the first time; (2) the organosilicon epoxy resin in the components is main resin, the siloxane bond skeleton of the organosilicon epoxy resin overcomes the defect of poor weather resistance of the epoxy resin, and the organosilicon epoxy resin is-Si-CH3Due to the existence of the organic silicon compound, the hydrophobic effect of the coating film is good, and the water resistance is high; meanwhile, the filler main body adopts silane coupling agent KH550 modified silicon nitride powder and titanium dioxide, so that the water resistance is better; (3) the curing agent is melamine resin, the silane coupling agent KH550 modified silicon nitride powder (with higher hardness) and titanium dioxide also participate in the crosslinking curing reaction, and the silicon nitride powder and the titanium dioxide are positioned in a high-molecular three-dimensional network structure after the coating film is cured, so that the water-resistant and corrosion-resistant epoxy resin powder coating has higher hardness and chemical corrosion resistance.
Detailed Description
The water-resistant and weather-resistant composite powder coating and the preparation method thereof according to the present invention will be further described with reference to the following examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
Example 1
A water-resistant weather-resistant composite powder coating comprises the following components in parts by weight: 60 parts of organic silicon epoxy resin, 20 parts of melamine resin, 0.5 part of 2-ethyl-4-methylimidazole, 5 parts of poly (hexamethylene terephthalamide), 3 parts of organic silicon flatting agent, 3 parts of quinoline, 3 parts of KH550 modified silicon nitride powder and 8 parts of KH550 modified titanium dioxide;
the preparation method of the organic silicon epoxy resin comprises the following steps:
(1) synthesizing organic silicon epoxy micromolecules: 2 parts by mole of 1,1,3, 3-tetramethyldisiloxane, 5X 10 in terms of metal platinum, was charged into the reactor under nitrogen-4Heating to 80 ℃ after mole parts of platinum catalyst and 10 mole parts of toluene, slowly dropwise adding 1 mole part of 3, 4-butylene glycol diglycidyl ether into the mixture, after 1 hour of dropwise adding, continuing to perform heat preservation reaction for 1 hour after the dropwise adding is finished, then adding 1 mole part of ethanol into the reaction device, continuing to perform heat preservation reaction for 1 hour, and performing reduced pressure distillation to remove the diluent, thus obtaining the catalystOrganic silicon epoxy micromolecules;
(2) and (3) synthesis of organic silicon epoxy resin: adding 35 parts by weight of ethyl orthosilicate, 6 parts by weight of methyltriethoxysilane, 6 parts by weight of (1) medium-organic silicon epoxy micromolecules and 15 parts by weight of xylene into a reactor, heating to 60 ℃, then slowly dropwise adding 2 parts by weight of p-toluenesulfonic acid and 8 parts by weight of deionized water into the reactor through different feed inlets respectively, after dropwise adding for 1h, keeping the temperature for continuous reaction for 4 hours, adding potassium hydroxide into the reactor to adjust the pH to 9, then heating the reactor to 90 ℃, carrying out reduced pressure distillation for polycondensation reaction for 2h, adding 1 part by weight of anhydrous calcium chloride, heating to 125 ℃, and continuing reduced pressure distillation for polycondensation reaction for 3h, namely an organic silicon epoxy resin crude product; washing the crude product with deionized water to neutrality, and vacuum drying to obtain the organosilicon epoxy resin.
Example 2
A water-resistant weather-resistant composite powder coating comprises the following components in parts by weight: 45 parts of organic silicon epoxy resin, 15 parts of melamine resin, 1.5 parts of 2-ethyl-4-methylimidazole, 10 parts of polybutylenediamine adipic acid amide, 2 parts of organic silicon leveling agent, 2 parts of benzotriazole, 6 parts of KH550 modified silicon nitride powder, 12 parts of KH550 modified titanium dioxide and 5 parts of pigment and filler;
the preparation method of the organic silicon epoxy resin comprises the following steps:
(1) synthesizing organic silicon epoxy micromolecules: under the condition of introducing nitrogen, 2 molar parts of 1,1,3, 3-tetramethyldisiloxane and 10X 10 parts of metal platinum are added into a reaction device-4Heating to 50 ℃ after the platinum catalyst and the toluene in molar parts are added in, slowly dropwise adding 5-vinyl-1, 3-benzenediol diglycidyl ether in 1 molar part into the mixture, keeping the temperature for reaction for 2 hours after the dropwise adding is finished in 0.5 hour, adding ethanol in 1 molar part into the reaction device, keeping the temperature for reaction for 2 hours, and removing the diluent by reduced pressure distillation to obtain the organosilicon epoxy micromolecule;
(2) and (3) synthesis of organic silicon epoxy resin: adding 35 parts by weight of ethyl orthosilicate, 5 parts by weight of methyltriethoxysilane, 5 parts by weight of (1) medium-silicone epoxy micromolecules and 20 parts by weight of xylene into a reactor, heating to 50 ℃, then slowly dropwise adding 1 part by weight of trifluoromethanesulfonic acid and 14 parts by weight of deionized water into the reactor through different feed inlets respectively, after dropwise adding is completed within 0.5h, keeping the temperature for continuous reaction for 6h, adding sodium hydroxide into the reactor to adjust the pH to 8, then heating the reactor to 95 ℃, carrying out reduced pressure distillation for polycondensation reaction for 1.5h, adding 2 parts by weight of anhydrous calcium chloride, heating to 115 ℃, and continuing reduced pressure distillation for polycondensation reaction for 4h, namely an organosilicon epoxy resin crude product; washing the crude product with deionized water to neutrality, and vacuum drying to obtain the organosilicon epoxy resin.
Example 3
A water-resistant weather-resistant composite powder coating comprises the following components in parts by weight: 53 parts of organic silicon epoxy resin, 16 parts of melamine resin, 0.6 part of 2-ethyl-4-methylimidazole, 8 parts of polyphthalamide, 2.4 parts of organic silicon flatting agent, 2.9 parts of thiazole, 5 parts of KH550 modified silicon nitride powder, 10 parts of KH550 modified titanium dioxide and 3 parts of pigment and filler;
the preparation method of the organic silicon epoxy resin comprises the following steps:
(1) synthesizing organic silicon epoxy micromolecules: 2 parts by mole of 1,1,3, 3-tetramethyldisiloxane, 6X 10 in terms of metal platinum, was charged into the reactor under nitrogen-4Heating to 60 ℃ after mole parts of platinum catalyst and 11 mole parts of toluene, slowly dropwise adding 1 mole part of itaconic acid diglycidyl ester into the mixture, after 0.8 hour of dropwise adding, continuing to perform heat preservation reaction for 1.4 hours after the dropwise adding, then adding 1 mole part of ethanol into the device for reaction, continuing to perform heat preservation reaction for 1.2 hours, and performing reduced pressure distillation to remove the diluent, thus obtaining the organosilicon epoxy micromolecule;
(2) and (3) synthesis of organic silicon epoxy resin: adding 35 parts by weight of ethyl orthosilicate, 5.5 parts by weight of methyltriethoxysilane, 5.5 parts by weight of (1) medium-silicone epoxy micromolecules and 16 parts by weight of xylene into a reactor, heating to 58 ℃, then slowly dropwise adding 1.5 parts by weight of concentrated hydrochloric acid and 10 parts by weight of deionized water into the reactor through different feed inlets respectively, after dropwise adding is completed within 0.6h, keeping the temperature for continuous reaction for 5h, adding sodium hydroxide into the reactor to adjust the pH to 9, then heating the reactor to 93 ℃, carrying out polycondensation reaction by reduced pressure distillation for 1.6h, adding 1.5 parts by weight of anhydrous calcium chloride, heating to 120 ℃, and continuing to carry out polycondensation reaction by reduced pressure distillation for 3.5h, namely an organosilicon epoxy resin crude product; washing the crude product with deionized water to neutrality, and vacuum drying to obtain the organosilicon epoxy resin.
The water-resistant weather-resistant composite powder coating in examples 1 to 3 was prepared according to the following method:
fully and uniformly mixing in mixing equipment according to the formula composition; then melt-extruding through a screw extruder, and controlling the temperature of a feeding section to be 60 ℃, the temperature of a melting section to be 80 ℃ and the temperature of a discharging section to be 100 ℃; and tabletting the molten material by a tabletting machine, controlling the thickness to be 2-3mm, crushing the molten material, feeding the crushed molten material into a grinding mill for crushing, and sieving the crushed molten material by a 200-mesh sieve to obtain the corrosion-resistant epoxy resin powder coating.
The water and weather resistant composite powder coatings of examples 1-3 and a commercially available weather resistant powder coating of a company (comparative example) were electrostatically sprayed on a rust and oil removing cold rolled steel sheet having a thickness of 1.0mm by a corona spray gun and then baked at 180 ℃ for 20min to have a coating thickness of 70 μm. + -. 3 μm, and the results of the performance tests are shown in the following table.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes, modifications and variations can be made therein without departing from the spirit and scope of the invention as defined in the following claims.
Claims (8)
1. The water-resistant weather-resistant composite powder coating is characterized by comprising the following components in parts by weight: 45-60 parts of organic silicon epoxy resin, 15-20 parts of melamine resin, 0.5-1.5 parts of curing accelerator, 5-10 parts of toughening agent, 2-3 parts of organic silicon leveling agent, 2-3 parts of corrosion inhibitor, 3-6 parts of KH550 modified silicon nitride powder, 8-12 parts of KH550 modified titanium dioxide, 0-5 parts of other pigments and fillers for removing KH550 modified silicon nitride powder and KH550 modified titanium dioxide;
the preparation method of the organic silicon epoxy resin comprises the following steps:
(1) synthesizing organic silicon epoxy micromolecules: 2 parts by mole of 1,1,3, 3-tetramethyldisiloxane, 5X 10 in terms of metal platinum, was charged into the reactor under nitrogen-4-10×10-4Heating to 50-80 ℃ after the platinum catalyst and the toluene in molar parts are added in molar parts, slowly dropwise adding an epoxidation reagent in 1 molar part into the mixture, after dropwise adding is completed within 0.5-1h, continuing to perform heat preservation reaction for 1-2h after the dropwise adding is completed, then adding ethanol in 1 molar part into a reaction device, continuing to perform heat preservation reaction for 1-2h, and performing reduced pressure distillation to remove a diluent, thus obtaining the organosilicon epoxy micromolecule;
(2) and (3) synthesis of organic silicon epoxy resin: adding 35 weight parts of ethyl orthosilicate, 5-6 weight parts of methyltriethoxysilane, 5-6 weight parts of (1) medium organosilicon epoxy micromolecule and 15-20 weight parts of dimethylbenzene into a reactor, heating to 50-60 ℃, then slowly dripping 1-2 parts by weight of acid catalyst and 8-14 parts by weight of deionized water into the reactor through different feed inlets respectively, after finishing dripping for 0.5-1h, keeping the temperature for continuous reaction for 4-6 h, adding inorganic base into the reactor to adjust the pH to 8-9, then heating the reactor to 90-95 ℃, carrying out reduced pressure distillation for carrying out polycondensation reaction for 1.5-2h, adding 1-2 parts by weight of anhydrous calcium chloride, heating to 115-125 ℃, and continuing reduced pressure distillation for carrying out polycondensation reaction for 3-4h, namely obtaining the crude product of the organosilicon epoxy resin; washing the crude product with deionized water to neutrality, and vacuum drying to obtain the organosilicon epoxy resin.
2. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the curing accelerator is 2-ethyl-4-methylimidazole.
3. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the toughening agent is at least one of poly (tetramethylene diamine adipic acid amide), poly (hexamethylene diamine terephthalate amide) and poly (phthalamide).
4. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the corrosion inhibitor is at least one of mercaptobenzothiazole, quinoline, methylbenzotriazole, benzotriazole and sodium lignosulfonate.
5. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the epoxidizing agent is at least one of itaconic acid diglycidyl ester, maleic acid diglycidyl ester, 1, 4-butylene glycol diglycidyl ether, 3, 4-butylene glycol diglycidyl ether and 5-vinyl-1, 3-benzenediol diglycidyl ether.
6. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the acid catalyst is at least one of concentrated hydrochloric acid, p-toluenesulfonic acid, concentrated sulfuric acid and trifluoromethanesulfonic acid.
7. The water-resistant weather-resistant composite powder coating as claimed in claim 1, wherein: the inorganic alkali is at least one of sodium hydroxide, potassium hydroxide and barium hydroxide.
8. A method for preparing the water-resistant weather-resistant composite powder coating of claim 1, comprising the steps of: the water-resistant weather-resistant composite powder coating is fully and uniformly mixed in mixing equipment according to the formula composition; then melt-extruding through a screw extruder, and controlling the temperature of a feeding section to be 60 ℃, the temperature of a melting section to be 80 ℃ and the temperature of a discharging section to be 100 ℃; and tabletting the molten material by a tabletting machine, controlling the thickness to be 2-3mm, crushing the molten material, feeding the crushed molten material into a grinding mill for crushing, and sieving the crushed molten material by a 200-mesh sieve to obtain the corrosion-resistant epoxy resin powder coating.
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| US6355740B1 (en) * | 1999-08-02 | 2002-03-12 | Kukdo Chemical Co., Ltd. | Silicone-modified epoxy resin and its preparing method and silicone-modified epoxy resin composition |
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| CN107033738A (en) * | 2017-05-04 | 2017-08-11 | 中国海洋大学 | A kind of preparation method of modified silicon nitride corrosion-inhibiting coating |
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| US6355740B1 (en) * | 1999-08-02 | 2002-03-12 | Kukdo Chemical Co., Ltd. | Silicone-modified epoxy resin and its preparing method and silicone-modified epoxy resin composition |
| JP2008056838A (en) * | 2006-09-01 | 2008-03-13 | Sumitomo Bakelite Co Ltd | Epoxy resin powder coating |
| CN103319975A (en) * | 2013-06-19 | 2013-09-25 | 上海海隆石油化工研究所 | Epoxy powder coating composition with high pulverization resistance |
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Application publication date: 20181221 Assignee: NINGBO AIYONG NEW MATERIAL TECHNOLOGY Co.,Ltd. Assignor: NINGBO SHUANGREN NEW MATERIAL CO.,LTD. Contract record no.: X2021330000690 Denomination of invention: The invention relates to a water and weather resistant composite powder coating and a preparation method thereof Granted publication date: 20201127 License type: Common License Record date: 20211105 |
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