CN113956789A - Super-hydrophobic coating for concrete and preparation method of super-hydrophobic concrete - Google Patents
Super-hydrophobic coating for concrete and preparation method of super-hydrophobic concrete Download PDFInfo
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- CN113956789A CN113956789A CN202111363517.3A CN202111363517A CN113956789A CN 113956789 A CN113956789 A CN 113956789A CN 202111363517 A CN202111363517 A CN 202111363517A CN 113956789 A CN113956789 A CN 113956789A
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- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 102
- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 238000000576 coating method Methods 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002086 nanomaterial Substances 0.000 claims abstract description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003607 modifier Substances 0.000 claims abstract description 11
- -1 alkoxy silane Chemical compound 0.000 claims abstract description 10
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910000077 silane Inorganic materials 0.000 claims abstract description 6
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 3
- 239000008117 stearic acid Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 57
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 29
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 28
- 238000001035 drying Methods 0.000 claims description 21
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 14
- 239000012153 distilled water Substances 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 14
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 12
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 11
- 229960000583 acetic acid Drugs 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000012362 glacial acetic acid Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 9
- 238000001723 curing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 claims description 6
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 4
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 claims description 4
- 229960003493 octyltriethoxysilane Drugs 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 150000002500 ions Chemical class 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 10
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 8
- 239000000428 dust Substances 0.000 description 6
- KYIDJMYDIPHNJS-UHFFFAOYSA-N ethanol;octadecanoic acid Chemical compound CCO.CCCCCCCCCCCCCCCCCC(O)=O KYIDJMYDIPHNJS-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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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
- 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
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
- C04B41/5116—Ag or Au
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
-
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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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
- 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
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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
- C09D7/60—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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
-
- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- 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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses a super-hydrophobic coating for concrete, super-hydrophobic concrete and a preparation method thereof, wherein the super-hydrophobic coating for concrete is prepared from the following raw materials in parts by weight: 20-50 parts of alkoxy silane and/or siloxane, 5-20 parts of inorganic nano material and 10-30 parts of water; the inorganic nano material is silver-doped nano titanium dioxide or a mixture of silver-doped nano titanium dioxide and nano silicon dioxide; the inorganic nano material is modified by a modifier, and the modifier is stearic acid or polydimethylsiloxane. The super-hydrophobic concrete prepared by coating the super-hydrophobic coating for concrete can block water and ions in water from invading, so that the concrete has good waterproofness, frost resistance and corrosion resistance, the durability of the concrete can be improved, and the service life of a concrete structure is prolonged.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a super-hydrophobic coating for concrete and a preparation method of super-hydrophobic concrete.
Background
Concrete is the largest man-made building material in the world today and plays a great role in infrastructure construction. However, the concrete inevitably receives water from the soil body and the like when in service, and if the water contains Cl-、Mg2+、SO4 2-Plasma aggressive ions which will follow the moisture along the concrete surfaceThe micropores enter the interior of the concrete, so that corrosion damage such as reinforcement corrosion, concrete spalling and the like is caused, the durability of the concrete is reduced, the service life of the concrete is shortened, and economic loss is caused.
Blocking water and its dissolved aggressive ions from the surface of the concrete and preventing them from penetrating into the interior of the concrete is one of the ways to improve the corrosion resistance and durability of the concrete. The coating treatment on the concrete surface can realize the barrier to water and solution. Some waterproof coating materials such as epoxy coating, chlorinated rubber coating and acrylic coating have waterproof effect, but are not breathable, and the protective film can be damaged by the permeation of water vapor in concrete, so that the anticorrosion effect is greatly reduced. In addition, the property of the concrete surface can be changed, namely, the surface is changed from hydrophilicity to hydrophobicity, the waterproof effect is achieved by means of the surface hydrophobicity, the organic silicon coating can achieve the function, but the capability of blocking water from entering the concrete is not strong, and the improvement of the corrosion resistance and the durability of the concrete is limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a super-hydrophobic coating for concrete and a preparation method of the super-hydrophobic concrete, wherein the super-hydrophobic concrete can block water and ions in water from invading, so that the concrete has good waterproofness, frost resistance and corrosion resistance, the durability of the concrete can be improved, and the service life of a concrete structure can be prolonged.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a super-hydrophobic coating for concrete, which is prepared from the following raw materials in parts by weight: 20-50 parts of alkoxy silane and/or siloxane, 5-20 parts of inorganic nano material and 10-30 parts of water; the inorganic nano material is silver-doped nano titanium dioxide or a mixture of silver-doped nano titanium dioxide and nano silicon dioxide; the inorganic nano material is modified by a modifier, and the modifier is stearic acid or polydimethylsiloxane.
Preferably, the alkoxy silane is one or more of N-propyl trimethoxy silane, octyl triethoxy silane and vinyl triethoxy silane.
Preferably, the particle size of the inorganic nano material is 10-100 nm.
Preferably, in the silver-doped nano titanium dioxide, the nano titanium dioxide is anatase, and the doping amount of silver is 0.27 wt% -0.67 wt%.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, dissolving butyl titanate in absolute ethyl alcohol to obtain a solution A; mixing absolute ethyl alcohol, distilled water, glacial acetic acid and silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1 (0.002-0.005);
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 0.5-1 h after dropwise adding is finished, heating to 145-155 ℃ for reaction for 7-10 h, cooling to room temperature after the reaction is finished, separating out a precipitate, washing, drying and grinding to obtain the silver-doped nano titanium dioxide, wherein the nano titanium dioxide is anatase type.
Preferably, in the solution A, the volume ratio of the butyl titanate to the absolute ethyl alcohol is 1: 3.5; in the solution B, the volume ratio of absolute ethyl alcohol, distilled water and glacial acetic acid is 1:0.3: 0.04.
The invention also provides a preparation method of the super-hydrophobic coating for concrete, which comprises the following steps:
dissolving a modifier in ethanol to prepare a modified solution, adding an inorganic nano material, performing ultrasonic dispersion for 30-60 min, stirring for 6-10 h, standing for 2h, performing centrifugal separation, collecting precipitate, and drying at 105-115 ℃ for 3-6 h to obtain a modified inorganic nano material;
and P2, adding the modified inorganic nano material into water, performing ultrasonic dispersion for 30-60 min, slowly adding alkoxy silane and/or siloxane under the stirring condition, rotating at the speed of 400-800 r/min, and stirring for 8-16 h to obtain the super-hydrophobic coating for concrete.
Preferably, in step P1, the concentration of the modifier in the modifying solution is 1 wt% to 10 wt%.
The invention provides super-hydrophobic concrete, namely super-hydrophobic coating for the concrete is coated on the surface of the concreteThe dosage of the coating is 5-20 m2/kg。
The preparation method of the super-hydrophobic concrete provided by the invention comprises the following steps:
t1, stirring, molding and curing the concrete according to the mixing proportion until the concrete is aged for more than 28 days, polishing the surface of the concrete until the roughness is 50-100 mu m, and cleaning the surface;
and T2, uniformly spraying the super-hydrophobic coating on the surface of the concrete, and drying for several hours at normal temperature to obtain the super-hydrophobic concrete.
Compared with the prior art, the invention has the beneficial effects that:
the silver-doped nano titanium dioxide has excellent super-hydrophobic performance, and the modifier with low surface energy is used for modifying nano particles, so that the inorganic nano material is endowed with lower surface energy, and the super-hydrophobic capability of the inorganic nano material is further improved. The concrete surface is polished to construct a rough surface, and the super-hydrophobic material and the concrete are organically combined to prepare the super-hydrophobic concrete according to a binary synergistic theory of 'low surface energy + rough surface', so that the concrete can be endowed with self-cleaning performance; pollutants such as dust and the like on the surface of the concrete are automatically removed under the action of water, and the phenomenon of water drop sagging is avoided, so that the attractiveness of the veneer is kept; more importantly, the concrete can effectively prevent water and ions in water from invading, so that the concrete has good waterproofness, frost resistance and corrosion resistance, the durability of the concrete is improved, the service life of a concrete structure is prolonged, the economic loss caused by the problems is reduced, and the concrete has good popularization and application prospects.
Detailed Description
The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
The super-hydrophobic coating for concrete provided by the embodiment is prepared from the following raw materials in parts by mass: 30 parts of polymethylhydrosiloxane, 5 parts of silver-doped nano titanium dioxide and 15 parts of water.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, adding 1 volume part of butyl titanate into a container, adding 3.5 volume parts of absolute ethyl alcohol while stirring, and stirring at room temperature for 0.5h to obtain a solution A; adding 1 volume part of absolute ethyl alcohol, 0.3 volume part of distilled water and 0.04 volume part of glacial acetic acid into a container, uniformly stirring, and adding silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1: 0.0025;
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 1h after dropwise adding is finished, heating to 150 ℃ for reacting for 8h, cooling to room temperature after the reaction is finished, separating out precipitates, alternately washing for 3 times by using absolute ethyl alcohol and distilled water, drying for 5h at 100 ℃, cooling, and grinding to obtain the silver-doped nano titanium dioxide with the particle size of 10-100 nm.
The preparation method of the super-hydrophobic coating for concrete comprises the following steps:
p1, preparing 100 parts of stearic acid ethanol solution with the concentration of 2 wt%, adding 5 parts of silver-doped nano titanium dioxide, performing ultrasonic dispersion for 45min, stirring for 8h, standing for 2h, performing centrifugal separation, collecting precipitate, and drying at 110 ℃ for 4h to obtain modified silver-doped nano titanium dioxide;
and P2, adding 5 parts of modified silver-doped nano titanium dioxide into 15 parts of water, performing ultrasonic dispersion for 45min, slowly adding 30 parts of polymethylhydrosiloxane under the stirring condition, rotating at 600r/min, and stirring for 12h to obtain the super-hydrophobic coating for concrete.
The super-hydrophobic concrete prepared by using the super-hydrophobic coating for concrete in the embodiment comprises the following steps:
t1, stirring, molding and curing the C50 concrete according to the mixing proportion until the concrete is aged for more than 28d, polishing the surface of the concrete by using a grinding wheel polisher until the roughness is 50-100 mu m, cleaning surface dust, and keeping the surface dry;
t2, uniformly spraying the super-hydrophobic coating for the concrete by using a sprayerThe dosage of the concrete is 10m on the surface of the concrete2And/kg, drying for 4 hours at normal temperature to obtain the super-hydrophobic concrete.
The contact angle of the super-hydrophobic concrete measured by a contact angle measuring instrument is 164 degrees, and the rolling angle is 7 degrees; after the super-hydrophobic concrete is placed under water flow to be washed for 6 hours, the contact angle of the super-hydrophobic concrete is measured to be 160 degrees, the rolling angle is measured to be 8 degrees, and the super-hydrophobic concrete still has good super-hydrophobic performance. An outdoor rainwater stain experiment (90d) is carried out according to GB/T31815 supple 2015 self-cleaning paint for the outer surface of a building, and the measured stain resistance is less than 3 percent without obvious rainwater stain.
Example 2
The super-hydrophobic coating for concrete provided by the embodiment is prepared from the following raw materials in parts by mass: 42 parts of N-propyl trimethoxy silane, 8 parts of silver-doped nano titanium dioxide and 20 parts of water.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, adding 1 volume part of butyl titanate into a container, adding 3.5 volume parts of absolute ethyl alcohol while stirring, and stirring at room temperature for 0.5h to obtain a solution A; adding 1 volume part of absolute ethyl alcohol, 0.3 volume part of distilled water and 0.04 volume part of glacial acetic acid into a container, uniformly stirring, and adding silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1: 0.002;
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 1h after dropwise adding is finished, heating to 150 ℃ for reacting for 8h, cooling to room temperature after the reaction is finished, separating out precipitates, alternately washing for 3 times by using absolute ethyl alcohol and distilled water, drying for 5h at 100 ℃, cooling, and grinding to obtain the silver-doped nano titanium dioxide with the particle size of 10-100 nm.
The preparation method of the super-hydrophobic coating for concrete comprises the following steps:
p1, preparing 100 parts of 5 wt% polydimethylsiloxane ethanol solution, adding 8 parts of silver-doped nano titanium dioxide, performing ultrasonic dispersion for 45min, stirring for 6h, standing for 2h, performing centrifugal separation, collecting precipitate, and drying at 105 ℃ for 4h to obtain modified silver-doped nano titanium dioxide;
and P2, adding 8 parts of modified silver-doped nano titanium dioxide into 20 parts of water, performing ultrasonic dispersion for 45min, slowly adding 42 parts of N-propyl trimethoxy silane under the stirring condition, rotating at the speed of 700r/min, and stirring for 10h to obtain the super-hydrophobic coating for the concrete.
The super-hydrophobic concrete prepared by using the super-hydrophobic coating for concrete in the embodiment comprises the following steps:
t1, stirring, molding and curing the C50 concrete according to the mixing proportion until the concrete is aged for more than 28d, polishing the surface of the concrete by using a grinding wheel polisher until the roughness is 50-100 mu m, cleaning surface dust, and keeping the surface dry;
t2, uniformly spraying the super-hydrophobic coating for the concrete on the surface of the concrete by using a sprayer, wherein the dosage is 18m2And/kg, drying for 4 hours at normal temperature to obtain the super-hydrophobic concrete.
The contact angle of the super-hydrophobic concrete measured by a contact angle measuring instrument in the embodiment is 155 degrees, and the rolling angle is 9 degrees; after the super-hydrophobic concrete is placed under water flow to be washed for 6 hours, the contact angle is measured to be 151 degrees, the rolling angle is measured to be 8 degrees, and the concrete still has good super-hydrophobic performance. An outdoor rainwater stain experiment (90d) is carried out according to GB/T31815 supple 2015 self-cleaning paint for the outer surface of a building, and the measured stain resistance is less than 3 percent without obvious rainwater stain.
Example 3
The super-hydrophobic coating for concrete provided by the embodiment is prepared from the following raw materials in parts by mass: 12 parts of polymethylhydrosiloxane, 30 parts of N-propyl trimethoxy silane, 4 parts of silver-doped nano titanium dioxide, 2 parts of nano silicon dioxide and 20 parts of water.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, adding 1 volume part of butyl titanate into a container, adding 3.5 volume parts of absolute ethyl alcohol while stirring, and stirring at room temperature for 0.5h to obtain a solution A; adding 1 volume part of absolute ethyl alcohol, 0.3 volume part of distilled water and 0.04 volume part of glacial acetic acid into a container, uniformly stirring, and adding silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1: 0.005;
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 1h after dropwise adding is finished, heating to 150 ℃ for reacting for 8h, cooling to room temperature after the reaction is finished, separating out precipitates, alternately washing for 3 times by using absolute ethyl alcohol and distilled water, drying for 5h at 100 ℃, cooling, and grinding to obtain the silver-doped nano titanium dioxide with the particle size of 10-100 nm.
The preparation method of the super-hydrophobic coating for concrete comprises the following steps:
p1, preparing 100 parts of stearic acid ethanol solution with the concentration of 2 wt%, adding 4 parts of silver-doped nano titanium dioxide and 2 parts of nano silicon dioxide, ultrasonically dispersing for 45min, stirring for 8h, standing for 2h, then performing centrifugal separation, collecting precipitate, and drying for 4h at 105 ℃ to obtain a modified inorganic nano material;
and P2, adding 6 parts of modified inorganic nano material into 20 parts of water, performing ultrasonic dispersion for 45min, slowly adding 12 parts of polymethylhydrosiloxane under the stirring condition, then adding 30 parts of N-propyl trimethoxy silane, rotating at the speed of 700r/min, and stirring for 10h to obtain the super-hydrophobic coating for concrete.
The super-hydrophobic concrete prepared by using the super-hydrophobic coating for concrete in the embodiment comprises the following steps:
t1, stirring, molding and curing the C50 concrete according to the mixing proportion until the concrete is aged for more than 28d, polishing the surface of the concrete by using a grinding wheel polisher until the roughness is 50-100 mu m, cleaning surface dust, and keeping the surface dry;
t2, uniformly spraying the super-hydrophobic coating for the concrete on the surface of the concrete by using a sprayer, wherein the using amount of the super-hydrophobic coating is 8m2And/kg, drying for 4 hours at normal temperature to obtain the super-hydrophobic concrete.
The contact angle of the super-hydrophobic concrete measured by a contact angle measuring instrument in the embodiment is 166 degrees, and the rolling angle is 7 degrees; after the super-hydrophobic concrete is placed under water flow to be washed for 6h, the contact angle is 159 degrees and the rolling angle is 8 degrees, and the concrete still has good super-hydrophobic performance. An outdoor rainwater stain experiment (90d) is carried out according to GB/T31815 supple 2015 self-cleaning paint for the outer surface of a building, and the measured stain resistance is less than 3 percent without obvious rainwater stain.
Example 4
The super-hydrophobic coating for concrete provided by the embodiment is prepared from the following raw materials in parts by mass: 12 parts of polymethylhydrosiloxane, 30 parts of octyl triethoxysilane, 4 parts of silver-doped nano titanium dioxide, 4 parts of nano silicon dioxide and 20 parts of water.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, adding 1 volume part of butyl titanate into a container, adding 3.5 volume parts of absolute ethyl alcohol while stirring, and stirring at room temperature for 0.5h to obtain a solution A; adding 1 volume part of absolute ethyl alcohol, 0.3 volume part of distilled water and 0.04 volume part of glacial acetic acid into a container, uniformly stirring, and adding silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1: 0.003;
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 1h after dropwise adding is finished, heating to 150 ℃ for reacting for 8h, cooling to room temperature after the reaction is finished, separating out precipitates, alternately washing for 3 times by using absolute ethyl alcohol and distilled water, drying for 5h at 100 ℃, cooling, and grinding to obtain the silver-doped nano titanium dioxide with the particle size of 10-100 nm.
The preparation method of the super-hydrophobic coating for concrete comprises the following steps:
p1, preparing 100 parts of stearic acid ethanol solution with the concentration of 5 wt%, adding 4 parts of silver-doped nano titanium dioxide and 4 parts of nano silicon dioxide, ultrasonically dispersing for 45min, stirring for 8h, standing for 2h, then performing centrifugal separation, collecting precipitate, and drying for 4h at 105 ℃ to obtain a modified inorganic nano material;
and P2, adding 8 parts of modified inorganic nano material into 20 parts of water, performing ultrasonic dispersion for 45min, slowly adding 12 parts of polymethylhydrosiloxane under the stirring condition, then adding 30 parts of octyl triethoxysilane, rotating at the speed of 700r/min, and stirring for 10h to obtain the super-hydrophobic coating for concrete.
The super-hydrophobic concrete prepared by using the super-hydrophobic coating for concrete in the embodiment comprises the following steps:
t1, stirring, molding and curing the C50 concrete according to the mixing proportion until the concrete is aged for more than 28d, polishing the surface of the concrete by using a grinding wheel polisher until the roughness is 50-100 mu m, cleaning surface dust, and keeping the surface dry;
t2, uniformly spraying the super-hydrophobic coating for the concrete on the surface of the concrete by using a sprayer, wherein the using amount of the super-hydrophobic coating is 15m2And/kg, drying for 4 hours at normal temperature to obtain the super-hydrophobic concrete.
The contact angle of the super-hydrophobic concrete measured by a contact angle measuring instrument is 160 degrees, and the rolling angle is 8 degrees; after the super-hydrophobic concrete is placed under water flow to be washed for 6 hours, the contact angle is measured to be 155 degrees, the rolling angle is measured to be 9 degrees, and the concrete still has good super-hydrophobic performance. An outdoor rainwater stain experiment (90d) is carried out according to GB/T31815 supple 2015 self-cleaning paint for the outer surface of a building, and the measured stain resistance is less than 3 percent without obvious rainwater stain.
Example 5
The super-hydrophobic coating for concrete provided by the embodiment is prepared from the following raw materials in parts by mass: 10 parts of polymethylhydrosiloxane, 35 parts of vinyl triethoxysilane, 6 parts of silver-doped nano titanium dioxide, 4 parts of nano silicon dioxide and 25 parts of water.
The silver-doped nano titanium dioxide is prepared by the following method:
s1, adding 1 volume part of butyl titanate into a container, adding 3.5 volume parts of absolute ethyl alcohol while stirring, and stirring at room temperature for 0.5h to obtain a solution A; adding 1 volume part of absolute ethyl alcohol, 0.3 volume part of distilled water and 0.04 volume part of glacial acetic acid into a container, uniformly stirring, and adding silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1: 0.003;
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing to stir for 1h after dropwise adding is finished, heating to 150 ℃ for reacting for 8h, cooling to room temperature after the reaction is finished, separating out precipitates, alternately washing for 3 times by using absolute ethyl alcohol and distilled water, drying for 5h at 100 ℃, cooling, and grinding to obtain the silver-doped nano titanium dioxide with the particle size of 10-100 nm.
The preparation method of the super-hydrophobic coating for concrete comprises the following steps:
p1, preparing 100 parts of stearic acid ethanol solution with the concentration of 5 wt%, adding 6 parts of silver-doped nano titanium dioxide and 4 parts of nano silicon dioxide, ultrasonically dispersing for 45min, stirring for 8h, standing for 2h, then performing centrifugal separation, collecting precipitate, and drying for 4h at 110 ℃ to obtain a modified inorganic nano material;
and P2, adding 10 parts of modified inorganic nano material into 25 parts of water, performing ultrasonic dispersion for 45min, slowly adding 10 parts of polymethylhydrosiloxane under the stirring condition, then adding 35 parts of vinyltriethoxysilane, rotating at 600r/min, and stirring for 12h to obtain the super-hydrophobic coating for concrete.
The super-hydrophobic concrete prepared by using the super-hydrophobic coating for concrete in the embodiment comprises the following steps:
t1, stirring, molding and curing the C50 concrete according to the mixing proportion until the concrete is aged for more than 28d, polishing the surface of the concrete by using a grinding wheel polisher until the roughness is 50-100 mu m, cleaning surface dust, and keeping the surface dry;
t2, uniformly spraying the super-hydrophobic coating for the concrete on the surface of the concrete by using a sprayer, wherein the using amount of the super-hydrophobic coating is 12m2And/kg, drying for 4 hours at normal temperature to obtain the super-hydrophobic concrete.
The contact angle of the super-hydrophobic concrete measured by a contact angle measuring instrument in the embodiment is 166 degrees, and the rolling angle is 7 degrees; after the super-hydrophobic concrete is placed under water flow to be washed for 6 hours, the contact angle of the super-hydrophobic concrete is 161 degrees, the rolling angle of the super-hydrophobic concrete is 8 degrees, and the super-hydrophobic concrete still has good super-hydrophobic performance. An outdoor rainwater stain experiment (90d) is carried out according to GB/T31815 supple 2015 self-cleaning paint for the outer surface of a building, and the measured stain resistance is less than 3 percent without obvious rainwater stain.
The super-hydrophobic concrete of all the above embodiments is subjected to an anti-freezing experiment, a water permeation resistance experiment and a chloride ion permeation resistance experiment by referring to GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete, wherein the anti-freezing experiment adopts a slow freezing method and is frozen and thawed 300 times, the water permeation resistance experiment adopts a step-by-step pressurization method, and the chloride ion permeation resistance experiment adopts an RCM method. The results of the experiment are shown in table 1.
TABLE 1 test results of long-term performance and durability of super-hydrophobic concrete in each example
The results show that the super-hydrophobic concrete has good super-hydrophobic performance and a self-cleaning function, can effectively prevent water from invading, improves the frost resistance, is beneficial to preventing the corrosion of chloride ions and improves the durability of the concrete.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are included in the scope of the present invention, and the scope of the present invention is subject to the scope of the claims.
Claims (10)
1. The super-hydrophobic coating for concrete is characterized by being prepared from the following raw materials in parts by mass: 20-50 parts of alkoxy silane and/or siloxane, 5-20 parts of inorganic nano material and 10-30 parts of water; the inorganic nano material is silver-doped nano titanium dioxide or a mixture of silver-doped nano titanium dioxide and nano silicon dioxide; the inorganic nano material is modified by a modifier, and the modifier is stearic acid or polydimethylsiloxane.
2. The super-hydrophobic coating for concrete according to claim 1, wherein the alkoxysilane is one or more of N-propyltrimethoxysilane, octyltriethoxysilane, and vinyltriethoxysilane.
3. The super-hydrophobic paint for concrete according to claim 1, wherein the particle size of the inorganic nano-material is 10-100 nm.
4. The super-hydrophobic paint for concrete according to claim 1, wherein in the silver-doped nano titanium dioxide, the nano titanium dioxide is anatase type, and the doping amount of silver is 0.27 wt% to 0.67 wt%.
5. The super-hydrophobic paint for concrete according to claim 4, wherein the silver-doped nano titanium dioxide is prepared by the following method:
s1, dissolving butyl titanate in absolute ethyl alcohol to obtain a solution A; mixing absolute ethyl alcohol, distilled water, glacial acetic acid and silver nitrate to obtain a solution B; the molar ratio of the butyl titanate to the silver nitrate is 1 (0.002-0.005);
s2, dropwise adding the solution A into the solution B, stirring while dropwise adding, continuing stirring for 0.5-1 h after dropwise adding is finished, heating to 145-155 ℃ for reaction for 7-10 h, cooling to room temperature after the reaction is finished, separating out a precipitate, washing, drying and grinding to obtain the silver-doped nano titanium dioxide.
6. The super-hydrophobic paint for concrete according to claim 5, wherein in the solution A, the volume ratio of the butyl titanate to the absolute ethyl alcohol is 1: 3.5; in the solution B, the volume ratio of absolute ethyl alcohol, distilled water and glacial acetic acid is 1:0.3: 0.04.
7. The method for preparing a superhydrophobic coating for concrete according to any one of claims 1 to 6, comprising the steps of:
dissolving a modifier in ethanol to prepare a modified solution, adding an inorganic nano material, performing ultrasonic dispersion for 30-60 min, stirring for 6-10 h, standing for 2h, performing centrifugal separation, collecting precipitate, and drying at 105-115 ℃ for 3-6 h to obtain a modified inorganic nano material;
and P2, adding the modified inorganic nano material into water, performing ultrasonic dispersion for 30-60 min, slowly adding alkoxy silane and/or siloxane under the stirring condition, rotating at the speed of 400-800 r/min, and stirring for 8-16 h to obtain the super-hydrophobic coating for concrete.
8. The method for preparing a superhydrophobic coating for concrete according to claim 7, wherein, in the step P1, the concentration of the modifier in the modification solution is 1 wt% to 10 wt%.
9. A super-hydrophobic concrete, characterized in that the concrete surface is coated with the super-hydrophobic coating for concrete according to any one of claims 1 to 6, and the dosage of the coating is 5 to 20m2/kg。
10. The method for preparing the superhydrophobic concrete of claim 9, comprising the steps of:
t1, stirring, molding and curing the concrete according to the mixing proportion until the concrete is aged for more than 28 days, polishing the surface of the concrete until the roughness is 50-100 mu m, and cleaning the surface;
and T2, uniformly spraying the super-hydrophobic coating on the surface of the concrete, and drying for several hours at normal temperature to obtain the super-hydrophobic concrete.
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