CN117511399A - Normal-temperature-cured water-based high-temperature-resistant coating and preparation method thereof - Google Patents
Normal-temperature-cured water-based high-temperature-resistant coating and preparation method thereof Download PDFInfo
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- CN117511399A CN117511399A CN202311612897.9A CN202311612897A CN117511399A CN 117511399 A CN117511399 A CN 117511399A CN 202311612897 A CN202311612897 A CN 202311612897A CN 117511399 A CN117511399 A CN 117511399A
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- 238000000576 coating method Methods 0.000 title claims abstract description 112
- 239000011248 coating agent Substances 0.000 title claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229920005989 resin Polymers 0.000 claims abstract description 65
- 239000011347 resin Substances 0.000 claims abstract description 65
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 62
- 239000010703 silicon Substances 0.000 claims abstract description 62
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 53
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 53
- 239000010456 wollastonite Substances 0.000 claims abstract description 53
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 40
- 229920005610 lignin Polymers 0.000 claims abstract description 18
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 18
- 239000004111 Potassium silicate Substances 0.000 claims abstract description 17
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 17
- 229910052913 potassium silicate Inorganic materials 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims description 43
- 239000003973 paint Substances 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 27
- 229920002050 silicone resin Polymers 0.000 claims description 26
- 239000006185 dispersion Substances 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 22
- -1 aluminum silver Chemical compound 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 229920000570 polyether Polymers 0.000 claims description 16
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 6
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 6
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- ORRNVHHOEJMPDQ-UHFFFAOYSA-N ethoxy-hydroxy-dimethoxysilane Chemical compound CCO[Si](O)(OC)OC ORRNVHHOEJMPDQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 29
- 230000003647 oxidation Effects 0.000 abstract description 24
- 239000011159 matrix material Substances 0.000 abstract description 7
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 7
- 230000005764 inhibitory process Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 3
- 238000003837 high-temperature calcination Methods 0.000 abstract description 3
- 238000006557 surface reaction Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 230000002829 reductive effect Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000004593 Epoxy Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 3
- 229910001947 lithium oxide Inorganic materials 0.000 description 3
- 239000002923 metal particle Substances 0.000 description 3
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000413 hydrolysate Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006388 chemical passivation reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 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
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 125000005624 silicic acid group Chemical group 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000009736 wetting 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
-
- 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
- C09D183/10—Block or graft copolymers containing polysiloxane sequences
- C09D183/12—Block or graft copolymers containing polysiloxane sequences containing polyether sequences
-
- 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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
-
- 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
- C09D5/18—Fireproof paints including high temperature resistant 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
-
- 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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- 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
- C09D7/65—Additives macromolecular
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- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- 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
- C08K2003/262—Alkali metal carbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a normal-temperature-cured water-based high-temperature-resistant coating and a preparation method thereof, belonging to the technical field of high-temperature-resistant coatings. The normal-temperature-cured water-based high-temperature-resistant coating comprises the following components in parts by weight: 40-45 parts of water-based organic silicon resin; 3-5 parts of siloxane modified wollastonite powder; 5-7 parts of aluminum paste; 0.4 to 0.8 part of lithium carbonate; 0.2 to 0.3 part of potassium silicate; 0.1 to 0.3 part of lignin; and water. The siloxane modified wollastonite powder has the functions of heat insulation, antioxidation and matrix enhancement; lithium carbonate and potassium silicate play roles in inhibiting oxidation and regulating a coating system through thermal decomposition reaction; the thermal stability of lignin can resist high temperature calcination; the aluminum paste plays roles in heat conduction, heat radiation reflection, surface reaction inhibition and the like. So that the coating can be kept stable for a long time under high temperature conditions and has a high temperature resistance limit exceeding 550 ℃.
Description
Technical Field
The invention belongs to the technical field of high-temperature resistant coatings, and particularly relates to a normal-temperature-cured water-based high-temperature resistant coating and a preparation method thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The paint is a liquid or solid material coated on the surface of an object and is used for providing protection, decoration, corrosion resistance and the like, and the main components of the paint comprise solvent, resin, filler and the like. With the development of society, the demand for paint in various fields has increased sharply. In some high temperature environments, the temperature of the environment where the paint is located is often high, and the common paint cannot bear the problems of thermal expansion, color change and the like in the high temperature environments, so that the high temperature resistant paint gradually appears in the field of vision of people.
The high-temperature resistant paint can bear the temperature of above 300 ℃ for a long time, a paint film is not cracked or falls off, and has certain physical and chemical properties, so that a protected object can normally play a role in a high-temperature environment, and the high-temperature resistant paint is generally composed of high-temperature resistant resin, high-temperature resistant filler, solvent, auxiliary agent and the like, and is continuously developed in order to meet the requirements of rapid development of modern equipment technology and applied to different temperatures and different fields. The high temperature resistant coating is classified into a bake curing type and a normal temperature curing type according to a curing mechanism.
The baking and curing type comprises pure organic silicon paint, acrylic acid modified organic silicon paint and the like, and the curing mechanism is that silicon hydroxyl groups in the organic silicon resin are condensed at high temperature to form silicon-oxygen silicon bonds and release water molecules. Common organosilicon high-temperature resistant paint cannot be fully cured under normal temperature conditions, and can reach the optimal performance after being cured for 0.5-1 h at 150-230 ℃. In practical application, when large-scale equipment facilities are subjected to large-area construction, baking and curing cannot be performed on the construction site. Because the paint film is not fully cured under the normal temperature condition after being coated, the physical and mechanical properties, the corrosion resistance and the chemical resistance of the paint film do not meet the requirements of full curing, and the phenomenon that the paint film fails in advance often occurs in actual use.
The normal temperature curing type paint mainly comprises: epoxy modified organosilicon paint and the pre-hydrolysate of ethyl silicate are used as high temperature resistant film forming resin. For the existing normal temperature cured coating, the inventor finds that the following problems exist:
aiming at the problem that the pre-hydrolysate of the ethyl silicate is used as the high-temperature-resistant film-forming resin, although the temperature-resistant limit can reach more than 500 ℃, the hydrolysis process of the ethyl silicate is complex, so that the preparation method of the high-temperature-resistant film-forming resin is complex and is not beneficial to actual production.
Aiming at the epoxy modified organosilicon paint, the preparation process is relatively simple and can be cured at normal temperature, but the temperature resistance limit is generally about 400 ℃; however, in high-temperature melting furnaces, melting equipment and heat treatment equipment in the metallurgical field, in automobile engines and exhaust systems, in combustion furnaces and boilers in the electric field, the temperature resistance limit of the coating is often required to be 450-500 ℃ or even higher, and obviously, in the above fields, the epoxy modified organosilicon coating is not applicable due to the defect of the temperature resistance limit of the epoxy modified organosilicon coating.
In view of the above, it is desirable to provide a water-based high temperature resistant coating which is simple in preparation method, has a heating limit of more than 500 ℃ and can be cured at normal temperature.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the normal-temperature-cured water-based high-temperature-resistant coating and the preparation method thereof, and the temperature resistance limit of the coating is improved by adding the components with heat insulation and oxidation resistance functions.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect, a normal temperature cured aqueous high temperature resistant coating comprises the following components in parts by weight:
40-45 parts of water-based organic silicon resin;
3-5 parts of siloxane modified wollastonite powder;
5-7 parts of aluminum paste;
0.4 to 0.8 part of lithium carbonate;
0.2 to 0.3 part of potassium silicate;
0.1 to 0.3 part of lignin;
and water.
Optionally, the weight portion of water is 2-3 times of that of the water-based organic silicon resin.
Optionally, the aqueous silicone resin is one or more of an acrylic silicone resin, a polyether silicone resin, a benzyl silicone resin, and a polyurethane silicone resin.
Preferably, the aqueous organic silicon resin is prepared by compounding polyether organic silicon resin and benzyl organic silicon resin according to a weight ratio of 3:1.
Optionally, the preparation method of the siloxane modified wollastonite powder comprises the following steps:
and (3) placing the mixture of the siloxane and wollastonite powder into an ethanol solution, uniformly stirring and drying to obtain the siloxane modified wollastonite powder.
Wherein the weight ratio of the siloxane to wollastonite powder is 1:80-90.
Optionally, the siloxane is a siloxane monomer, which is: methyl trimethoxy siloxane, methyl triethoxy siloxane, methyl triisopropoxy siloxane, ethyl trimethoxy siloxane, ethyl triethoxy siloxane, propyl trimethoxy siloxane, propyl triethoxy siloxane, phenyl trimethoxy siloxane or phenyl triethoxy siloxane.
Optionally, the wollastonite powder has an average particle size of: 10-23 mu m
Optionally, the addition amount of the ethanol is 90-110% of the weight part of wollastonite powder.
Optionally, the specific stirring step includes: the rotating speed is controlled to be not higher than 60r/min, and the stirring is carried out for 2.5 to 3.5 hours at the temperature of 25 to 45 ℃.
Alternatively, the drying method is air drying.
In a second aspect, the preparation method of the normal-temperature-cured water-based high-temperature-resistant coating comprises the following steps:
s1, uniformly mixing siloxane modified wollastonite powder, lithium carbonate, potassium silicate and lignin, and grinding to a granularity not higher than 25 mu m to obtain a dry material;
s2, mixing the water-based organic silicon resin, water and the dry material obtained in the step S1, and uniformly stirring at a low speed to obtain a mixture;
s3, adding all aluminum silver paste into the mixture for multiple times, stirring and dispersing to prepare the normal-temperature-cured water-based high-temperature-resistant coating.
Optionally, in S1, in the mixing step, the rotation speed of the stirrer is: 500-600 r/min.
Optionally, in S2, the silicone resin and water are mixed, and the dry material is added after being stirred uniformly.
Optionally, in S3, the total aluminum paste is divided into 20% by weight, 40% by weight and 40% by weight, the 20% by weight aluminum paste is added into the mixture, the 40% by weight aluminum paste is added after the first stirring and dispersing, the 40% by weight aluminum paste is added after the second stirring and dispersing, and the third stirring and dispersing is performed.
Optionally, the step of first stirring and dispersing includes: the rotation speed of the stirrer is 120-180 r/min, and the dispersion is carried out for 10min; the second stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min; the third stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min.
Alternatively, the first stirring dispersion is performed at 40 ℃, the second stirring dispersion and the third stirring dispersion are performed at 55 ℃.
In the third aspect, the coating prepared from the water-based high-temperature-resistant coating cured at normal temperature has the curing temperature of normal temperature and the temperature resistance limit of more than 550 ℃.
The beneficial effects of the invention are as follows:
1. the temperature resistance limit of the aqueous organic silicon resin adopted by the invention is lower, the temperature resistance limit of the unmodified organic silicon resin is lower than 350 ℃, and the temperature resistance limit of the epoxy modified organic silicon resin can only reach 400 ℃. The invention adds the siloxane modified wollastonite powder in the components, has the functions of heat insulation, antioxidation and matrix reinforcement, improves the temperature resistance limit of the coating, and overcomes the defect of the temperature resistance limit of the traditional organic silicon resin; the lithium carbonate and the potassium silicate improve the high temperature resistance of the coating through the synergistic effect of the aspects of thermal decomposition reaction, oxidation inhibition, structural stability enhancement, thermal decomposition inhibition, oxidation resistance, coating system regulation and the like: the aluminum silver paste can effectively improve the high temperature resistance of the coating through the synergistic effect of the heat conducting property, heat radiation reflection, surface reaction inhibition and the like; meanwhile, the heat conduction performance of the aluminum silver particles can reduce the temperature of the surface of the coating, and weaken heat conduction, so that the high temperature resistance of the coating is improved. Lignin can improve the high temperature resistance of the coating through the synergistic effect of the aspects of thermal stability, oxidation resistance, matrix enhancement and the like: the thermal stability of lignin can resist high-temperature calcination, and the thermal stability and high-temperature resistance of the coating are improved. Meanwhile, lignin can resist oxidation, so that the oxidation process of the surface of the paint is reduced, and the oxidation resistance of the paint is improved. The addition of lithium carbonate and potassium silicate can form a stable heat absorption layer and an oxidation layer, reduce heat conduction, oxidation reaction and degradation, and cooperatively cooperate with the rest of components, so that the coating can be kept stable for a long time under high temperature conditions and has a high temperature resistance limit exceeding 550 ℃.
2. The water-based organic silicon resin is one or more of acrylic organic silicon resin, polyether organic silicon resin, benzyl organic silicon resin and polyurethane organic silicon resin; the organic silicon resin has better heat resistance and weather resistance, has better stability and can be used as a coating main body. When the aqueous organic silicon resin is compounded by polyether organic silicon resin and benzyl organic silicon resin according to the weight ratio of 3:1, compared with the single use of any organic silicon resin, the aqueous organic silicon resin has the following advantages: the polyether organic silicon resin has good high temperature resistance, and the benzyl organic silicon resin can provide good wear resistance and chemical corrosion resistance, and when the two are compounded, the polyether organic silicon resin can enhance the high temperature resistance of the coating, keep the stability of the coating, and the benzyl organic silicon resin can provide additional wear resistance and chemical corrosion resistance, so that the coating can better resist thermal expansion in a high temperature environment, and the durability of the high temperature resistant resin can be improved.
3. According to the preparation method disclosed by the invention, the aluminum silver paste and the mixture are mixed step by step, so that the dispersion condition of aluminum silver particles in the coating can be better controlled and regulated. By gradually adding, the aluminum particles can be ensured to be fully dispersed in the coating system, the phenomena of agglomeration, precipitation and accumulation are avoided, and the uniformity, the stability and the consistency of the coating are maintained. The dispersion degree of aluminum powder particles is improved, and the effect of weakening and heat transfer is fully exerted.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The water-based high-temperature-resistant coating cured at normal temperature comprises the following components in parts by weight:
40-45 parts of water-based organic silicon resin;
3-5 parts of siloxane modified wollastonite powder;
5-7 parts of aluminum paste;
0.4 to 0.8 part of lithium carbonate;
0.2 to 0.3 part of potassium silicate;
0.1 to 0.3 part of lignin;
and water.
Optionally, the weight portion of water is 2-3 times of that of the water-based organic silicon resin.
Optionally, the aqueous silicone resin is one or more of acrylic silicone resin, polyether silicone resin, benzyl silicone resin and polyurethane silicone resin;
preferably, the aqueous organic silicon resin is prepared by compounding polyether organic silicon resin and benzyl organic silicon resin according to a weight ratio of 3:1;
the aqueous organic silicon resin has a special chemical structure: the organic group and the inorganic silicic acid chain are connected through the formation of the silica bond to form a three-dimensional network structure, and the structure endows the organic silicon resin with higher heat resistance;
the aqueous organic silicon resin forms a matrix of the normal-temperature-cured aqueous high-temperature-resistant coating.
Optionally, the preparation method of the siloxane modified wollastonite powder comprises the following steps:
and (3) placing the mixture of the siloxane and wollastonite powder into an ethanol solution, uniformly stirring and drying to obtain the siloxane modified wollastonite powder.
Wherein the weight ratio of the siloxane to wollastonite powder is 1:80-90;
the siloxane modified wollastonite powder has the following functions:
(1) heat insulation; wollastonite powder is an inorganic material with low thermal conductivity, and the surface of wollastonite is covered with a layer of siloxane film which can slow down heat conduction and form a stable heat insulation layer at high temperature through siloxane modification treatment. After the wollastonite powder modified by the siloxane is added into the coating, the heat conduction can be reduced, so that the temperature of the surface of the coating is reduced, and the high temperature resistance is improved;
(2) an antioxidation effect; the siloxane film on the surface of the siloxane modified wollastonite powder can play a certain role in oxidation protection, and the surface of the coating is easy to undergo oxidation reaction at high temperature to form an oxidation product, so that the performance of the coating is reduced. The existence of the siloxane film can prevent oxygen from entering and reduce the oxidation rate of the coating, so that the oxidation resistance of the coating is improved and the service life of the coating is prolonged;
(3) reinforcing the matrix; wollastonite powder can be used as filler to increase the solid content of paint and strengthen the matrix structure. The addition of the filler can increase the hardness, strength and wear resistance of the coating, making the coating harder and more durable. This is particularly important for coatings in high temperature environments, which can improve the high temperature resistance of the coating.
Optionally, the siloxane is a siloxane monomer, which is: methyl trimethoxy siloxane, methyl triethoxy siloxane, methyl triisopropoxy siloxane, ethyl trimethoxy siloxane, ethyl triethoxy siloxane, propyl trimethoxy siloxane, propyl triethoxy siloxane, phenyl trimethoxy siloxane or phenyl triethoxy siloxane.
Optionally, the wollastonite powder has an average particle size of: 10-23 mu m, and the granularity of the powder is unified with that of other dry materials in grinding.
Optionally, the addition amount of the ethanol is 90-110% of the weight part of wollastonite powder; the ethanol is used for wetting wollastonite powder and promoting the sufficient contact between the siloxane and the wollastonite powder.
Preferably, the added weight of the ethanol is the same as the weight of wollastonite powder.
Optionally, the specific stirring step includes: the rotating speed is controlled to be not higher than 60r/min, and the stirring is carried out for 2.5 to 3.5 hours at the temperature of 25 to 45 ℃.
Alternatively, the drying method is air drying.
The addition of lithium carbonate to the coating may function as follows:
(1) thermal decomposition reaction: the lithium carbonate can generate thermal decomposition reaction at high temperature to generate carbon dioxide and lithium oxide, absorb a large amount of heat to form a heat absorption layer, effectively reduce the surface temperature of the coating, slow down heat conduction and improve high temperature resistance;
(2) inhibition of oxidation: lithium carbonate can generate lithium oxide at high temperature, the lithium oxide can be combined with oxygen in the coating to form a stable oxide layer, the oxygen is prevented from further corroding the coating, and the high temperature resistance of the coating is improved;
(3) the structural stability is enhanced: the lithium carbonate can increase the solid component of the coating and enhance the structural stability and wear resistance of the coating.
The addition of potassium silicate to the coating may function as follows:
(1) thermal decomposition inhibition: the potassium silicate can inhibit the thermal decomposition reaction of other components in the coating, which is harmful to the coating, at high temperature, and prevent the generation of decomposition products, thereby reducing the release of heat and heat conduction, maintaining the stability of the coating and improving the high temperature resistance;
(2) oxidation resistance: the potassium silicate can form potassium oxide to react with free radicals in organic components in the coating, so that the oxidation reaction of the coating is reduced, the oxidation and degradation of the coating are prevented by inhibiting oxygen from entering the coating, and the oxidation resistance and the high temperature resistance of the coating are improved.
The addition of the aluminum paste into the paint can play the following roles:
(1) thermal conductivity: the metal aluminum in the aluminum silver paste has higher heat conduction performance, after the aluminum silver paste is added into the coating, the metal particles in the coating can increase the heat conduction of the surface of the coating, and can effectively absorb and disperse the heat in the coating, thereby reducing the heat conduction, reducing the temperature of the surface of the coating and improving the high temperature resistance of the coating;
(2) reflection of thermal radiation: the aluminum in the aluminum silver paste has good heat radiation reflection performance. At high temperature, the surface of the coating is irradiated by heat radiation, so that the surface temperature is increased, and metal particles of aluminum can reflect part of the heat radiation, so that the increase of the surface temperature of the coating is reduced, and the high temperature resistance of the coating is improved;
(3) surface reaction inhibition: the existence of the aluminum silver paste can also inhibit the oxidation reaction of the surface of the coating, and the particles of the metal aluminum can absorb oxygen to form an oxidation layer to prevent the oxidation reaction, so that the generation of oxidation products can be reduced, the oxidation rate of the coating is reduced, and the oxidation resistance and the high temperature resistance of the coating are improved.
Lignin can improve the high temperature resistance of the coating through the synergistic effect of the aspects of thermal stability, oxidation resistance, matrix enhancement and the like:
the thermal stability of lignin can resist high-temperature calcination, and the thermal stability and high-temperature resistance of the coating are improved. Meanwhile, lignin can resist oxidation, so that the oxidation process of the surface of the paint is reduced, and the oxidation resistance of the paint is improved.
Although the aqueous silicone resin is limited by its lower temperature resistance limit, even an epoxy modified silicone resin can only reach a temperature resistance limit of 400 ℃, and the unmodified silicone resin has a temperature resistance limit of less than 350 ℃, the coating can be kept stable for a long time under high temperature conditions by being matched with the rest of components, and has a temperature resistance limit exceeding 550 ℃.
The preparation method of the normal-temperature-cured water-based high-temperature-resistant coating comprises the following steps:
s1, uniformly mixing siloxane modified wollastonite powder, lithium carbonate, potassium silicate and lignin, and grinding to a granularity not higher than 25 mu m to obtain a dry material;
s2, mixing the water-based organic silicon resin, water and the dry material obtained in the step S1, and uniformly stirring at a low speed to obtain a mixture;
s3, dividing all aluminum paste into three parts of 20% of total aluminum paste by weight, 40% of total aluminum paste by weight and 40% of total aluminum paste by weight, adding the aluminum paste of 20% of total aluminum paste by weight into the mixture, adding the aluminum paste of 40% of total aluminum paste by weight after the first stirring and dispersing, adding the aluminum paste of 40% of the total aluminum paste by weight after the second stirring and dispersing, and preparing the normal-temperature-cured water-based high-temperature-resistant paint after the third stirring and dispersing.
Optionally, in S1, in the mixing step, the rotation speed of the stirrer is: 500-600 r/min.
Optionally, in S2, the silicone resin is mixed with water, and the dry material is added after sufficient mixing.
Optionally, in S3, the step of first stirring and dispersing includes: the rotation speed of the stirrer is 120-180 r/min, and the dispersion is carried out for 10min; the second stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min; the third stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min.
Alternatively, the first stirring dispersion is performed at 40 ℃, the second stirring dispersion and the third stirring dispersion are performed at 55 ℃.
( This is due to: after the aluminum paste is added, the viscosity of the mixture increases, so that the stirring dispersion temperature needs to be increased, and the mixture is added multiple times to promote the dispersion of aluminum in the aluminum paste. )
The coating prepared from the normal-temperature-cured water-based high-temperature-resistant coating has a temperature resistance limit of more than 550 ℃.
Optionally, the coating is coated by spraying and brushing,
alternatively, the paint film thickness is 0.1mm.
To further illustrate the invention, the following examples are provided in which the aluminum paste is an aqueous aluminum paste HC series, commercially available from Manterbo nanotechnology;
wollastonite powder is a commercial product, and the main component is calcium carbonate.
1. Preparation example of siloxane modified wollastonite powder
Preparation example 1
10g of methyltrimethoxysilane and 800g of wollastonite powder with the granularity of 20 mu m are weighed, mixed and placed in 800g of ethanol, the rotating speed is controlled to be 60r/min, and the mixture is stirred for 2.5 hours at the temperature of 25 ℃ and then air-dried to obtain the siloxane modified wollastonite powder.
Preparation example 2
10g of methyltrimethoxysilane and 850g of wollastonite powder with the granularity of 20 mu m are weighed, mixed and placed in 850g of ethanol, the rotating speed is controlled to be 50r/min, and the mixture is stirred for 3 hours at 38 ℃ and air-dried to obtain the siloxane modified wollastonite powder.
Preparation example 3
10g of methyltrimethoxysilane and 900g of wollastonite powder with the granularity of 20 mu m are weighed, mixed and placed in 900g of ethanol, the rotating speed is controlled to be 45r/min, and the mixture is stirred for 3.5 hours at the temperature of 45 ℃ and then air-dried to obtain the siloxane modified wollastonite powder.
The siloxane modified wollastonite powder obtained in preparation examples 1 to 3 has the same performance, and can be used for preparing the water-based high-temperature-resistant coating cured at normal temperature to obtain the same effect.
2. Examples of Normal temperature cured waterborne high temperature resistant coatings
Example 1
S1, weighing 30g of siloxane modified wollastonite powder, 4g of lithium carbonate, 2g of potassium silicate and 1g of lignin, fully mixing at 500r/min, and grinding to a particle size not higher than 25 mu m to obtain a dry material;
wherein, the siloxane modified wollastonite powder is obtained in preparation example 1;
s2, weighing 400g of water-borne organic silicon resin and 1200g of water, mixing with the obtained dry material, and stirring and mixing for 20min at 40r/min to obtain a mixture;
wherein the water-based organic silicon resin is selected from acrylic organic silicon resin, and the solid content is 52wt%;
s3, heating the obtained mixture to 40 ℃ in a water bath, and then adding 10g of aluminum paste at 40 ℃ into the mixture, and dispersing for 10min at 120 r/min; heating in water bath to 55deg.C, adding 55deg.C 20g aluminum paste, and dispersing at 140r/min for 15min; the temperature is controlled unchanged, and the final 55 ℃ 20g of aluminum paste is added for 15min of dispersion at 140r/min to prepare the water-based high-temperature-resistant coating cured at normal temperature;
wherein 50g of aluminum paste was added together.
Example 2
S1, weighing 42g of siloxane modified wollastonite powder, 5g of lithium carbonate, 2.4g of potassium silicate and 2.1g of lignin, fully mixing at 550r/min, and grinding to a particle size not higher than 25 mu m to obtain a dry material;
wherein, the siloxane-modified wollastonite powder is obtained in preparation example 2;
s2, weighing 430g of water-borne organic silicon resin and 1030g of water, mixing with the obtained dry material, and stirring and mixing for 20min at 40r/min to obtain a mixture;
wherein the water-based organic silicon resin is prepared by compounding polyether organic silicon resin with the solid content of 50wt% and benzyl organic silicon resin with the solid content of 50wt% according to the weight ratio of 3:1;
s3, heating the obtained mixture to 40 ℃ in a water bath, and then adding 12g of aluminum silver paste at 40 ℃ into the mixture, and dispersing for 10min at 140 r/min; heating the water bath to 55 ℃, adding 24g of aluminum paste at 55 ℃ and dispersing for 15min at 160 r/min; the temperature is controlled unchanged, and the final 24g of aluminum silver paste at 55 ℃ is added for dispersing for 15min at 140-200 r/min to prepare the water-based high-temperature-resistant coating cured at normal temperature;
wherein 60g of aluminum paste was added.
Example 3
S1, weighing 50g of siloxane modified wollastonite powder, 8g of lithium carbonate, 3g of potassium silicate and 3g of lignin, fully mixing at 600r/min, and grinding to a particle size not higher than 25 mu m to obtain a dry material;
wherein, the siloxane modified wollastonite powder is obtained in preparation example 3;
s2, weighing 450g of water-borne organic silicon resin and 900g of water, mixing with the obtained dry material, and stirring and mixing for 40min at 60r/min to obtain a mixture;
wherein the water-based organic silicon resin is prepared by compounding polyether organic silicon resin with the solid content of 48wt% and acrylic organic silicon resin with the solid content of 50wt%, and the weight ratio is 1:1;
s3, heating the obtained mixture to 40 ℃ in a water bath, and then adding 14g of aluminum silver paste at 40 ℃ into the mixture, and dispersing for 10min at 180 r/min; heating the water bath to 55 ℃, adding 28g of aluminum silver paste at 55 ℃, and dispersing for 15min at 200 r/min; the temperature is controlled unchanged, and the final 28g of aluminum silver paste at 55 ℃ is added for dispersing for 15min at 200r/min to prepare the water-based high-temperature-resistant coating cured at normal temperature;
wherein 70g of aluminum paste was added in total.
3. Comparative example of Normal temperature cured waterborne high temperature resistant coating
Comparative example 1
This comparative example is compared with example 1, with the difference that: wollastonite powder in the components is not modified by siloxane.
Comparative example 2
This comparative example is compared with example 1, with the difference that: no siloxane modified wollastonite powder is added.
Comparative example 3
This comparative example is compared with example 1, with the difference that: no aluminum paste is added; the preparation method does not comprise the step-by-step addition of aluminum paste.
Comparative example 4
This comparative example is compared with example 1, with the difference that: no lithium carbonate was added.
Comparative example 5
This comparative example is compared with example 1, with the difference that: potassium silicate is not added.
Comparative example 6
This comparative example is compared with example 1, with the difference that: no lignin was added.
Performance detection
Performance testing was performed on each of the above examples and comparative examples.
And (3) heat resistance detection: and (3) referring to the requirements of a standard GB/T735-2009 'film heat resistance assay', placing the cured test piece into a muffle furnace, programming to reach a measurement temperature, keeping the constant temperature for 3h, cooling to room temperature, taking out the test piece, and observing the surface condition of the coating.
Drying time: the surface drying time and the actual drying time of the paint are tested by referring to the standard/T1728-2020 paint film and putty drying time measuring method.
Adhesion force: the adhesion of the coating after curing for 7d is tested by referring to the standard GB/T5210-2006 adhesion test of the color paint and varnish pulling-off method, and the dry film thickness of the coating is 100 mu m.
The test results are shown in Table 1.
TABLE 1
It can be seen that: the coatings prepared in examples 1-3 have good temperature resistance limits, are all above 550 ℃, have short open time and real time, and have adhesion force above 5 MPa.
The coatings prepared in comparative examples 1 to 6 all exhibited cracks at 400℃as compared with example 1, i.e., none of the components was present, and the 550℃resistance was not achieved.
The aqueous silicone resin of example 2 is a 3:1 blend of polyether silicone resin and benzyl silicone resin, and has the following advantages compared with the single use of any one of the silicone resins: the polyether organic silicon resin has good high temperature resistance, and the benzyl organic silicon resin can provide better wear resistance and chemical corrosion resistance, and when the two are compounded, the polyether organic silicon resin can enhance the high temperature resistance of the coating, keep the stability of the coating, and the benzyl organic silicon resin can provide additional wear resistance and chemical corrosion resistance, so that the coating can better resist thermal expansion in a high-temperature environment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. 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 (10)
1. The water-based high-temperature-resistant coating cured at normal temperature is characterized by comprising the following components in parts by weight:
40-45 parts of water-based organic silicon resin;
3-5 parts of siloxane modified wollastonite powder;
5-7 parts of aluminum paste;
0.4 to 0.8 part of lithium carbonate;
0.2 to 0.3 part of potassium silicate;
0.1 to 0.3 part of lignin;
and water.
2. The normal temperature-curable aqueous high temperature resistant coating according to claim 1, wherein the water is 2 to 3 times by weight of the aqueous silicone resin.
3. The room temperature-curable aqueous high temperature resistant coating according to claim 1, wherein the aqueous silicone resin is one or more of an acrylic silicone resin, a polyether silicone resin, a benzyl silicone resin, and a polyurethane silicone resin;
optionally, the aqueous organic silicon resin is obtained by compounding polyether organic silicon resin and benzyl organic silicon resin according to a weight ratio of 3:1;
optionally, the aqueous organic silicon resin is obtained by compounding polyether organic silicon resin and acrylic organic silicon resin according to a weight ratio of 1:1.
4. The room temperature curing aqueous high temperature resistant coating according to claim 1, wherein the preparation method of the siloxane modified wollastonite powder comprises the following steps:
and (3) placing the mixture of the siloxane and wollastonite powder into an ethanol solution, uniformly stirring and drying to obtain the siloxane modified wollastonite powder.
5. The normal temperature-curable aqueous high temperature resistant coating according to claim 4, wherein the weight ratio of the siloxane to wollastonite powder is 1:80-90;
optionally, the siloxane is a siloxane monomer, which is: methyl trimethoxy siloxane, methyl triethoxy siloxane, methyl triisopropoxy siloxane, ethyl trimethoxy siloxane, ethyl triethoxy siloxane, propyl trimethoxy siloxane, propyl triethoxy siloxane, phenyl trimethoxy siloxane or phenyl triethoxy siloxane.
6. The room temperature-curable aqueous high temperature resistant coating according to claim 4, wherein the wollastonite powder has an average particle size of: 10-23 mu m
Optionally, the addition amount of the ethanol is 90-110% of the weight part of wollastonite powder;
alternatively, the drying method is air drying.
7. A method for preparing the normal temperature-curable aqueous high temperature resistant paint according to any one of claims 1 to 6, comprising the steps of:
s1, uniformly mixing siloxane modified wollastonite powder, lithium carbonate, potassium silicate and lignin, and grinding to a granularity not higher than 25 mu m to obtain a dry material;
s2, mixing the water-based organic silicon resin, water and the dry material obtained in the step S1, and uniformly stirring at a low speed to obtain a mixture;
s3, adding all aluminum silver paste into the mixture for multiple times, stirring and dispersing to prepare the normal-temperature-cured water-based high-temperature-resistant coating.
8. The method for preparing a room temperature curing aqueous high temperature resistant coating according to claim 7, wherein in S2, the silicone resin and water are mixed, and the dry material is added after being stirred uniformly.
9. The method for preparing a room temperature curable aqueous high temperature resistant coating according to claim 7, wherein in S3, all aluminum paste is divided into 20% by total weight, 40% by total weight and 40% by total weight; adding 20% of aluminum silver paste by total weight into the mixture, adding 40% of aluminum silver paste by total weight after first stirring and dispersing, adding 40% of aluminum silver paste by total weight after second stirring and dispersing, and carrying out third stirring and dispersing;
optionally, the step of first stirring and dispersing includes: the rotation speed of the stirrer is 120-180 r/min, and the dispersion is carried out for 10min; the second stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min; the third stirring and dispersing step comprises the following steps: the rotation speed of the stirrer is 140-200 r/min, and the dispersion is carried out for 15min;
alternatively, the first stirring dispersion is performed at 40 ℃, the second stirring dispersion and the third stirring dispersion are performed at 55 ℃.
10. A coating prepared by the method for preparing the normal-temperature-cured aqueous high-temperature-resistant coating according to any one of claims 1 to 6 and/or the normal-temperature-cured aqueous high-temperature-resistant coating according to any one of claims 7 to 9, wherein the curing temperature is normal temperature and the temperature resistance limit is more than 550 ℃.
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