CN117050613B - Epoxy resin coating for underwater and preparation method thereof - Google Patents
Epoxy resin coating for underwater and preparation method thereof Download PDFInfo
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- CN117050613B CN117050613B CN202310723928.1A CN202310723928A CN117050613B CN 117050613 B CN117050613 B CN 117050613B CN 202310723928 A CN202310723928 A CN 202310723928A CN 117050613 B CN117050613 B CN 117050613B
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 60
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 60
- 238000000576 coating method Methods 0.000 title claims abstract description 47
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000945 filler Substances 0.000 claims abstract description 48
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 24
- 239000010703 silicon Substances 0.000 claims abstract description 24
- 150000004982 aromatic amines Chemical class 0.000 claims abstract description 20
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- OWEYKIWAZBBXJK-UHFFFAOYSA-N 1,1-Dichloro-2,2-bis(4-hydroxyphenyl)ethylene Chemical compound C1=CC(O)=CC=C1C(=C(Cl)Cl)C1=CC=C(O)C=C1 OWEYKIWAZBBXJK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 238000009736 wetting Methods 0.000 claims abstract description 8
- 239000013530 defoamer Substances 0.000 claims abstract description 6
- 239000003085 diluting agent Substances 0.000 claims abstract description 6
- 150000001412 amines Chemical class 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 36
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 31
- 229910000514 dolomite Inorganic materials 0.000 claims description 30
- 239000010459 dolomite Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 22
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 20
- 239000000376 reactant Substances 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 14
- XMOCLSLCDHWDHP-SWLSCSKDSA-N (+)-Epigallocatechin Natural products C1([C@H]2OC3=CC(O)=CC(O)=C3C[C@@H]2O)=CC(O)=C(O)C(O)=C1 XMOCLSLCDHWDHP-SWLSCSKDSA-N 0.000 claims description 13
- JWQFKVGACKJIAV-UHFFFAOYSA-N 5-[(3-carboxy-4-hydroxyphenyl)methyl]-2-hydroxybenzoic acid Chemical compound C1=C(O)C(C(=O)O)=CC(CC=2C=C(C(O)=CC=2)C(O)=O)=C1 JWQFKVGACKJIAV-UHFFFAOYSA-N 0.000 claims description 13
- XMOCLSLCDHWDHP-UHFFFAOYSA-N L-Epigallocatechin Natural products OC1CC2=C(O)C=C(O)C=C2OC1C1=CC(O)=C(O)C(O)=C1 XMOCLSLCDHWDHP-UHFFFAOYSA-N 0.000 claims description 13
- XMOCLSLCDHWDHP-IUODEOHRSA-N epi-Gallocatechin Chemical compound C1([C@H]2OC3=CC(O)=CC(O)=C3C[C@H]2O)=CC(O)=C(O)C(O)=C1 XMOCLSLCDHWDHP-IUODEOHRSA-N 0.000 claims description 13
- DZYNKLUGCOSVKS-UHFFFAOYSA-N epigallocatechin Natural products OC1Cc2cc(O)cc(O)c2OC1c3cc(O)c(O)c(O)c3 DZYNKLUGCOSVKS-UHFFFAOYSA-N 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000012153 distilled water Substances 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- -1 polysiloxane Polymers 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical group CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical group CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 claims description 6
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004359 castor oil Substances 0.000 claims description 6
- 235000019438 castor oil Nutrition 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 229920005862 polyol Polymers 0.000 claims description 6
- 150000003077 polyols Chemical class 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000010025 steaming Methods 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 4
- 229920002866 paraformaldehyde Polymers 0.000 claims description 4
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 239000012745 toughening agent Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 18
- 238000012360 testing method Methods 0.000 description 11
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000012267 brine Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007112 amidation reaction Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229940018564 m-phenylenediamine Drugs 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004580 weight loss Effects 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5006—Amines aliphatic
- C08G59/5013—Amines aliphatic containing more than seven carbon atoms, e.g. fatty amines
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/56—Amines together with other curing agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
- C08G59/623—Aminophenols
-
- 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
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Epoxy Resins (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides an underwater epoxy resin coating which consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 50-60 parts of bisphenol C type epoxy resin, 10-15 parts of organic silicon resin, 5-10 parts of reactive diluent, 10-20 parts of flexibilizer, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer, 28-30 parts of filler and 28-30 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 50-70 parts of modified aromatic amine, 25-35 parts of fatty amine, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer and 29-38 parts of filler. The invention also provides a preparation method of the epoxy resin coating. The underwater epoxy resin coating provided by the invention has better water resistance, heat resistance, impact resistance and corrosion resistance.
Description
Technical Field
The invention relates to an epoxy resin coating, in particular to an epoxy resin coating for underwater use and a preparation method thereof.
Background
With the continuous development of offshore oil, ports and wharfs, hydroelectric power stations and the ship industry, many engineering structures in marine environments, such as drilling and exploitation equipment, drilling platforms, offshore oil and gas storage tanks, support frames of conveying pipelines, trestle, steel piles and the like, are easy to damage due to the fact that the original anticorrosive layers of the structures are soaked in seawater throughout the year, and the structures are difficult to move to land for in-situ repair when being maintained and protected, so that a coating capable of being directly coated under water is needed. When the ship leaks in navigation, if the underwater paint is directly plugged and maintained, the ship can timely remove faults, and valuable time is saved and maintenance cost is reduced because docking maintenance is not needed.
The epoxy resin coating has high adhesive force, excellent chemical resistance and solvent resistance, high hardness and good wear resistance, has been widely applied in industry, and is one of the main types of underwater anticorrosive coatings. The most studied epoxy resin at home and abroad at present is bisphenol A type epoxy resin (structural formula shown as follows) synthesized by taking bisphenol A as raw material, is prepared by condensing bisphenol A and epichlorohydrin under alkaline condition, and refining by water washing and desolventizing, and has better bonding strength, mechanical property and insulating property, but not ideal water resistance and heat resistance.
Chinese patent application CN201310563988.8 discloses an epoxy resin curing agent and an epoxy resin coating, wherein the epoxy resin curing agent mainly comprises bisphenol a type epoxy resin, curing agent, diluent, modifier, quartz powder and aluminum powder, and each 100 parts of water comprises the following components in percentage by mass: 46-48% of epoxy resin, 12-14% of epoxy resin curing agent, 17-19% of filler, 12-14% of pigment and 10-12% of auxiliary agent. The problems with this patent when used underwater are: it is poor in water resistance, heat resistance and impact resistance.
Disclosure of Invention
The invention aims to provide an underwater epoxy resin coating which has better water resistance, heat resistance, impact resistance and corrosion resistance.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the epoxy resin coating for underwater consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 50-60 parts of bisphenol C type epoxy resin, 10-15 parts of organic silicon resin, 5-10 parts of reactive diluent, 10-20 parts of flexibilizer, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer, 28-30 parts of filler and 28-30 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 50-70 parts of modified aromatic amine, 25-35 parts of fatty amine, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer and 29-38 parts of filler.
Further, the silicone resin of the present invention is prepared by the steps of:
adding 5,5' -methylene bis-salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-amino ethyl amino methyl) tetramethyl disilane, carrying out reflux reaction at 45 ℃ for 18-24 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing with deionized water and ethanol for 3 times, and drying to obtain the organic silicon resin.
Further, in the preparation step of the organic silicon resin, the proportion of 5,5' -methylene bis salicylic acid, N-dimethylformamide, methanol, sodium methoxide and 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g to 25mL to 30mL to 0.3g to 2g, the drying temperature is 85 ℃, and the drying time is 12 hours.
Further, the reactive diluent is ethylene glycol diglycidyl ether.
Further, the toughening agent is castor oil polyol.
Further, the wetting dispersant of the invention is a polyether siloxane copolymer; the defoaming agent is organic modified polysiloxane; the fatty amine is dodecyl amine.
Further, the modified aromatic amine of the present invention is prepared by the steps of:
adding 15 parts by weight of nonylphenol, 100 parts by weight of paraformaldehyde and 5 parts by weight of m-xylylenediamine into a reaction kettle, heating to 140 ℃ for reaction for 1 hour, adding 280 parts by weight of m-xylylenediamine into the reaction kettle, heating to 180 ℃ for continuous reaction for 3 hours, and vacuumizing for dehydration to obtain the modified aromatic amine.
Further, the filler of the present invention is prepared by the steps of:
mixing dolomite powder, distilled water and ethanol, performing ultrasonic dispersion for 20-30 minutes to obtain dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 1-2 hours to obtain mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying to obtain the filler.
Further, in the preparation step of the filler, the particle size of dolomite powder is 400 meshes, the proportion of dolomite powder, distilled water, ethanol and gallocatechin is 2g:30mL:30mL:1g, the drying temperature is 65 ℃, and the drying time is 12 hours.
Another technical problem to be solved by the invention is to provide a preparation method of the epoxy resin coating for underwater use.
In order to solve the technical problems, the technical scheme is as follows:
the preparation method of the underwater epoxy resin coating comprises the following steps:
s1. Preparation of a component A: weighing the components according to parts by weight, adding the components except the filler into a container, stirring for 30-40 minutes at the speed of 400-600 r/min, then adding the filler, stirring for 30-40 minutes at the speed of 1200 r/min, grinding to the fineness of less than or equal to 20 mu m, and adjusting the paint to the viscosity of 11000-15000mPa.s at the temperature of 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 20-30 minutes at the speed of 600-800 rpm, discharging, and sieving with a 120-mesh sieve to obtain the component B.
Compared with the prior art, the invention has the following beneficial effects:
1) The structural formula of the bisphenol C type epoxy resin used in the invention is shown as follows:
compared with bisphenol A epoxy resin, the bisphenol C epoxy resin has methyl introduced into bisphenol skeleton, raised water resistance, heat resistance and corrosion resistance, and may be repaired directly under water.
2) The organic silicon resin agent used in the invention is prepared by amidation reaction with 1, 3-bis- (2-amino ethyl amino methyl) tetramethyl disilane and 5,5' -methylene disalicylic acid as raw materials under the catalysis of sodium methoxide, has stronger water resistance and heat resistance, and can further improve the water resistance and heat resistance of the epoxy resin coating.
3) The curing agent used in the invention is compounded by modified aromatic amine and dodecylamine, has better underwater curing performance, so that the epoxy resin coating has ideal curing speed and the drying time can meet the use requirement, wherein the modified aromatic amine is prepared by reacting the union phenol, the paraformaldehyde and the m-phenylenediamine, and the impact resistance of the epoxy resin coating can be effectively improved.
4) The filler used in the invention is prepared by modifying the surface of dolomite powder through gallocatechin, and compared with the dolomite powder with stronger hydrophilicity, the hydrophobicity of the modified filler is greatly improved, and the modified filler can be better dispersed in an epoxy resin system, thereby further improving the impact resistance of the epoxy resin coating.
Detailed Description
The present invention will be described in detail with reference to specific examples, wherein the exemplary embodiments of the present invention and the descriptions thereof are provided for the purpose of illustrating the present invention, but are not to be construed as limiting the present invention.
Example 1
The epoxy resin coating for underwater consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 55 parts of bisphenol C type epoxy resin, 14 parts of organic silicon resin, 8 parts of ethylene glycol diglycidyl ether, 15 parts of castor oil polyol, 0.7 part of polyether siloxane copolymer, 0.3 part of organic modified polysiloxane, 29 parts of filler and 29 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 60 parts of modified aromatic amine, 30 parts of dodecyl amine, 0.8 part of polyether siloxane copolymer, 0.3 part of organic modified polysiloxane and 35 parts of filler.
The organic silicon resin is prepared by the following steps:
adding 5,5 '-methylene bis salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane, carrying out reflux reaction at 45 ℃ for 21 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing the reactant with deionized water and ethanol for 3 times, and drying the reactant at 85 ℃ for 12 hours to obtain the organic silicon resin, wherein the ratio of the 5,5' -methylene bis salicylic acid, the N, N-dimethylformamide, the methanol, the sodium methoxide to the 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g to 25mL to 30mL to 0.3g to 2g.
The modified aromatic amine is prepared by the following steps:
adding 15 parts by weight of nonylphenol, 100 parts by weight of paraformaldehyde and 5 parts by weight of m-xylylenediamine into a reaction kettle, heating to 140 ℃ for reaction for 1 hour, adding 280 parts by weight of m-xylylenediamine into the reaction kettle, heating to 180 ℃ for continuous reaction for 3 hours, and vacuumizing for dehydration to obtain the modified aromatic amine.
The filler is prepared by the following steps:
mixing dolomite powder with the particle size of 400 meshes, distilled water and ethanol, performing ultrasonic dispersion for 25 minutes to obtain a dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 1.5 hours to obtain a mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying at 65 ℃ for 12 hours to obtain a filler, wherein the ratio of the dolomite powder to the distilled water to the ethanol to the gallocatechin is 2g:30mL:30mL:1g.
The preparation method of example 1 comprises the following steps:
s1. Preparation of a component A: weighing the components according to the parts by weight, adding the components except the filler into a container, stirring for 35 minutes at the speed of 500 revolutions per minute, then adding the filler, stirring for 35 minutes at the speed of 1200 revolutions per minute, grinding until the fineness is less than or equal to 20 mu m, and mixing the paint until the viscosity is 11000-15000mPa.s at the temperature of 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 25 minutes at the speed of 700 revolutions per minute, discharging, and sieving with a 120-mesh sieve to obtain the component B.
Example 2
The epoxy resin coating for underwater consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 57 parts of bisphenol C type epoxy resin, 12 parts of organic silicon resin, 5 parts of ethylene glycol diglycidyl ether, 20 parts of castor oil polyol, 0.8 part of polyether siloxane copolymer, 0.2 part of organic modified polysiloxane, 28 parts of filler and 30 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 50 parts of modified aromatic amine, 35 parts of dodecyl amine, 0.7 part of polyether siloxane copolymer, 0.4 part of organic modified polysiloxane and 38 parts of filler. The procedure for the preparation of the modified aromatic amine was the same as in example 1.
The organic silicon resin is prepared by the following steps:
adding 5,5 '-methylene bis salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane, carrying out reflux reaction at 45 ℃ for 20 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing the reactant with deionized water and ethanol for 3 times, and drying the reactant at 85 ℃ for 12 hours to obtain the organic silicon resin, wherein the ratio of the 5,5' -methylene bis salicylic acid, the N, N-dimethylformamide, the methanol, the sodium methoxide to the 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g to 25mL to 30mL to 0.3g to 2g.
The filler is prepared by the following steps:
mixing dolomite powder with the particle size of 400 meshes, distilled water and ethanol, performing ultrasonic dispersion for 27 minutes to obtain a dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 1.6 hours to obtain a mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying at 65 ℃ for 12 hours to obtain a filler, wherein the ratio of the dolomite powder to the distilled water to the ethanol to the gallocatechin is 2g:30mL:30mL:1g.
The preparation method of example 2 comprises the following steps:
s1. Preparation of a component A: weighing the components according to parts by weight, adding the components except the filler into a container, stirring for 32 minutes at the speed of 450 r/min, then adding the filler, stirring for 36 minutes at the speed of 1200 r/min, grinding until the fineness is less than or equal to 20 mu m, and mixing the paint until the viscosity is 11000-15000mPa.s at the temperature of 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 21 minutes at the speed of 750 revolutions per minute, discharging, and sieving with a 120-mesh sieve to obtain the component B.
Example 3
The epoxy resin coating for underwater consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 50 parts of bisphenol C type epoxy resin, 15 parts of organic silicon resin, 9 parts of ethylene glycol diglycidyl ether, 18 parts of castor oil polyol, 1 part of polyether siloxane copolymer, 0.1 part of organic modified polysiloxane, 30 parts of filler and 28.5 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 66 parts of modified aromatic amine, 28 parts of dodecyl amine, 0.5 part of polyether siloxane copolymer, 0.1 part of organic modified polysiloxane and 29 parts of filler. The procedure for the preparation of the modified aromatic amine was the same as in example 1.
The organic silicon resin is prepared by the following steps:
adding 5,5 '-methylene bis salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane, carrying out reflux reaction at 45 ℃ for 18 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing the reactant with deionized water and ethanol for 3 times, and drying the reactant at 85 ℃ for 12 hours to obtain the organic silicon resin, wherein the ratio of the 5,5' -methylene bis salicylic acid, the N, N-dimethylformamide, the methanol, the sodium methoxide to the 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g to 25mL to 30mL to 0.3g to 2g.
The filler is prepared by the following steps:
mixing dolomite powder with the particle size of 400 meshes, distilled water and ethanol, performing ultrasonic dispersion for 20 minutes to obtain a dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 1 hour to obtain a mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying at 65 ℃ for 12 hours to obtain a filler, wherein the ratio of the dolomite powder to the distilled water to the ethanol to the gallocatechin is 2g:30mL:30mL:1g.
The preparation method of example 3 comprises the following steps:
s1. Preparation of a component A: weighing the components according to parts by weight, adding the components except the filler into a container, stirring for 40 minutes at 400 rpm, then adding the filler, stirring for 40 minutes at 1200 rpm, grinding until the fineness is less than or equal to 20 mu m, and mixing the paint until the viscosity is 11000-15000mPa.s at 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 30 minutes at the speed of 600 revolutions per minute, discharging, and sieving with a 120-mesh sieve to obtain the component B.
Example 4
The epoxy resin coating for underwater consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 60 parts of bisphenol C type epoxy resin, 10 parts of organic silicon resin, 10 parts of ethylene glycol diglycidyl ether, 10 parts of castor oil polyol, 0.5 part of polyether siloxane copolymer, 0.5 part of organic modified polysiloxane, 29.5 parts of filler and 28 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 70 parts of modified aromatic amine, 25 parts of dodecyl amine, 1 part of polyether siloxane copolymer, 0.5 part of organic modified polysiloxane and 32 parts of filler. The procedure for the preparation of the modified aromatic amine was the same as in example 1.
The organic silicon resin is prepared by the following steps:
adding 5,5 '-methylene bis salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane, carrying out reflux reaction at 45 ℃ for 24 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing the reactant with deionized water and ethanol for 3 times, and drying the reactant at 85 ℃ for 12 hours to obtain the organic silicon resin, wherein the ratio of the 5,5' -methylene bis salicylic acid, the N, N-dimethylformamide, the methanol, the sodium methoxide to the 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g to 25mL to 30mL to 0.3g to 2g.
The filler is prepared by the following steps:
mixing dolomite powder with the particle size of 400 meshes, distilled water and ethanol, performing ultrasonic dispersion for 30 minutes to obtain a dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 2 hours to obtain a mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying at 65 ℃ for 12 hours to obtain a filler, wherein the ratio of the dolomite powder to the distilled water to the ethanol to the gallocatechin is 2g:30mL:30mL:1g.
The preparation method of example 4 comprises the following steps:
s1. Preparation of a component A: weighing the components according to parts by weight, adding the components except the filler into a container, stirring for 30 minutes at 600 rpm, then adding the filler, stirring for 30 minutes at 1200 rpm, grinding until the fineness is less than or equal to 20 mu m, and mixing the paint until the viscosity is 11000-15000mPa.s at 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 20 minutes at the speed of 800 revolutions per minute, discharging, and sieving with a 120-mesh sieve to obtain the component B.
Reference example 1
The difference from example 1 is that: the bisphenol C type epoxy resin in the a component is replaced with bisphenol a type epoxy resin.
Reference example 2
The difference from example 1 is that: the component A does not comprise organic silicon resin, and the preparation step is omitted.
Reference example 3
The difference from example 1 is that: the filler in the component A and the filler in the component B are replaced by dolomite powder with the particle size of 400 meshes which is not subjected to modification treatment, so that the preparation step of the filler is omitted.
Reference example 4
The difference from example 1 is that: the component B does not contain modified aromatic amine, so that the preparation step is omitted.
Comparative example: example four of chinese patent application No. CN 201310563988.8.
Sample preparation:
templates of examples 1-4, reference examples 1-4: the components A and B of the epoxy resin coating prepared in examples 1 to 4 and comparative examples 1 to 4 were uniformly mixed, and brushed on a Q235 steel plate to obtain a sample after drying at room temperature for 10 days, wherein the thickness of the coating is 100. Mu.m.
Template of comparative example: the epoxy resin paint prepared in the comparative example was brushed onto a Q235 steel plate to a thickness of 100 μm, and dried at room temperature for 10 days to obtain a sample plate.
Experimental example one: water resistance test
The templates of examples 1 to 4, reference examples 1 to 2 and comparative examples were immersed in water in a constant temperature water tank at 25℃with reference to GB/T1733-1993, the surface of the template coating was observed, the time elapsed from the immersion in water until the occurrence of a bubble peeling phenomenon on the coating surface was recorded as a water-resistant time, the longer the water-resistant time was, the better the water resistance was, and the test results are shown in Table 1:
TABLE 1
| Water resistance time (hours) | |
| Example 1 | 800 |
| Example 2 | 790 |
| Example 3 | 780 |
| Example 4 | 820 |
| Reference example 1 | 710 |
| Reference example 2 | 720 |
| Comparative example | 600 |
As can be seen from Table 1, the water resistance times of examples 1 to 4 of the present invention are all longer than those of the comparative examples, indicating that the epoxy resin coating prepared by the present invention has good water resistance. The components and preparation steps of reference examples 1 and 2 are different from those of example 1, and the water resistance time of the reference examples 1 and 2 is shortened compared with that of example 1, which shows that the bisphenol C type epoxy resin and the organic silicon resin used in the invention can improve the water resistance of the epoxy resin coating.
Experimental example two: heat resistance test
The coatings on the templates of examples 1-4, reference examples 1-2, and comparative examples were peeled off, and the temperature at which 50% of the coating weight loss was measured using a comprehensive thermal analyzer was recorded as T 50％ The test conditions were: nitrogen atmosphere, room temperature-800 ℃, and heating rate of 10 ℃/min. T (T) 50％ The higher the heat resistance is, the better. The test results are shown in table 2:
TABLE 2
| T 50％ (℃) | |
| Example 1 | 432 |
| Example 2 | 431 |
| Example 3 | 428 |
| Example 4 | 434 |
| Reference example 1 | 421 |
| Reference example 2 | 423 |
| Comparative example | 410 |
As can be seen from Table 2, T of examples 1 to 4 of the present invention 50％ All are higher than the comparative examples, which shows that the epoxy resin coating prepared by the invention has better heat resistance. The components and preparation steps of reference examples 1 and 2 are different from those of example 1, and T of reference examples 1 and 2 is compared with example 1 50％ Both the bisphenol C type epoxy resin and the organic silicon resin used in the invention can improve the heat resistance of the epoxy resin coating.
Experimental example three: adhesion test
The adhesion ratings of the coatings of examples 1-4, comparative examples, respectively, were determined by cross-hatch with reference to GB/T9286-1998, the lower the adhesion rating, the better the adhesion, and the test results are shown in Table 3:
TABLE 3 Table 3
| Adhesion rating (grade) | |
| Example 1 | 1 |
| Example 2 | 1 |
| Example 3 | 1 |
| Example 4 | 1 |
| Comparative example | 2 |
As can be seen from Table 3, the adhesive force grades of examples 1-4 of the present invention are all lower than that of comparative example, which is 1 grade, showing that the epoxy resin coating prepared by the present invention has good adhesive force.
Experimental example four: impact resistance test
The impact height values of the coatings of examples 1 to 4, reference examples 3 to 4, and comparative examples were determined using a paint film impactor with reference to GB/T1732-2020, respectively, and a larger impact height value indicates a better impact resistance, and the test results are shown in Table 4:
TABLE 4 Table 4
As can be seen from Table 4, the impact height values of examples 1 to 4 of the present invention are all larger than those of the comparative examples, indicating that the epoxy resin coating prepared by the present invention has good impact resistance. The components and preparation steps of reference examples 3 and 4 are different from those of example 1, and the impact resistance height value of the reference example 3 is reduced compared with that of example 1, which shows that the filler used by the invention has better effect of improving the impact resistance of the epoxy resin coating compared with dolomite powder which is not subjected to modification treatment; the impact height value of reference example 4 was also reduced, indicating that the modified aromatic amine used in the present invention also improved the impact resistance of the epoxy resin coating.
Experimental example five: corrosion resistance test
The templates of examples 1 to 4, reference example 1 and comparative example were immersed in a sodium chloride solution of 5% mass concentration in a constant temperature water tank at 25 ℃ respectively with reference to GB/T10834-2008, the surface of the template coating was observed, the time elapsed from the immersion in the sodium chloride solution until the occurrence of a bubble and fall phenomenon on the coating surface was recorded as a brine-resistant time, and the longer the brine-resistant time was indicative of the better corrosion resistance, and the test results are shown in table 5:
TABLE 5
| Brine tolerance time (hours) | |
| Example 1 | 360 |
| Example 2 | 360 |
| Example 3 | 340 |
| Example 4 | 370 |
| Reference example 1 | 310 |
| Comparative example | 290 |
As can be seen from Table 5, the salt water resistance times of examples 1 to 4 of the present invention are longer than those of the comparative examples, showing that the epoxy resin coating prepared by the present invention has good corrosion resistance. The composition of reference example 1 is different from that of example 1, and the brine-resistant time of reference example 1 is shortened compared with that of example 1, which shows that the bisphenol C-type epoxy resin used in the present invention can improve the corrosion resistance of the epoxy resin paint.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (5)
1. An epoxy resin coating for use under water, characterized in that: the composite material consists of a component A and a component B in a mass ratio of 4:1, wherein the component A consists of the following components in parts by weight: 50-60 parts of bisphenol C type epoxy resin, 10-15 parts of organic silicon resin, 5-10 parts of reactive diluent, 10-20 parts of flexibilizer, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer, 28-30 parts of filler and 28-30 parts of dimethylbenzene; the component B consists of the following components in parts by weight: 50-70 parts of modified aromatic amine, 25-35 parts of fatty amine, 0.5-1 part of wetting dispersant, 0.1-0.5 part of defoamer and 29-38 parts of filler;
the organic silicon resin is prepared by the following steps:
adding 5,5' -methylene bis-salicylic acid, N-dimethylformamide, methanol and sodium methoxide into a reaction bottle, stirring for 5 minutes, adding 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane, carrying out reflux reaction at 45 ℃ for 18-24 hours to obtain a reactant, decompressing and steaming the reactant to remove a solvent, respectively washing with deionized water and ethanol for 3 times, and drying to obtain the organic silicon resin; in the preparation step of the organic silicon resin, the proportion of 5,5' -methylene bis salicylic acid, N-dimethylformamide, methanol, sodium methoxide and 1, 3-bis- (2-aminoethylaminomethyl) tetramethyldisilane is 3g:25mL:30mL:0.3g:2g, the drying temperature is 85 ℃, and the drying time is 12 hours;
the modified aromatic amine is prepared by the following steps:
adding 15 parts by weight of nonylphenol, 100 parts by weight of paraformaldehyde and 5 parts by weight of m-xylylenediamine into a reaction kettle, heating to 140 ℃ for reaction for 1 hour, adding 280 parts by weight of m-xylylenediamine into the reaction kettle, heating to 180 ℃ for continuous reaction for 3 hours, and vacuumizing for dehydration to obtain modified aromatic amine;
the filler is prepared by the following steps:
mixing dolomite powder, distilled water and ethanol, performing ultrasonic dispersion for 20-30 minutes to obtain dolomite powder solution, adding gallocatechin into the dolomite powder solution, adjusting the pH value to 5, stirring at 75 ℃ for 1-2 hours to obtain mixed solution, performing suction filtration on the mixed solution to obtain a filter cake, washing the filter cake with deionized water for 3 times, and drying to obtain filler; in the preparation step of the filler, the particle size of dolomite powder is 400 meshes, the proportion of dolomite powder, distilled water, ethanol and gallocatechin is 2g:30mL:30mL:1g, the drying temperature is 65 ℃, and the drying time is 12 hours.
2. An epoxy resin coating for underwater use according to claim 1, wherein: the reactive diluent is ethylene glycol diglycidyl ether.
3. An epoxy resin coating for underwater use according to claim 1, wherein: the toughening agent is castor oil polyol.
4. An epoxy resin coating for underwater use according to claim 1, wherein: the wetting dispersant is a polyether siloxane copolymer; the defoaming agent is organic modified polysiloxane; the fatty amine is dodecyl amine.
5. The method for preparing an epoxy resin coating for underwater use according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
s1. Preparation of a component A: weighing the components according to parts by weight, adding the components except the filler into a container, stirring for 30-40 minutes at the speed of 400-600 r/min, then adding the filler, stirring for 30-40 minutes at the speed of 1200 r/min, grinding to the fineness of less than or equal to 20 mu m, and adjusting the paint to the viscosity of 11000-15000mPa.s at the temperature of 25 ℃ to obtain a component A;
s2. Preparation of a component B: weighing the components according to the weight parts, adding the components into a container, stirring for 20-30 minutes at the speed of 600-800 rpm, discharging, and sieving with a 120-mesh sieve to obtain the component B.
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