CN114956684A - Super-hydrophobic self-cleaning coating for cement-based surface, coating and preparation method thereof - Google Patents
Super-hydrophobic self-cleaning coating for cement-based surface, coating and preparation method thereof Download PDFInfo
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- 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
- C04B41/5076—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 with masses bonded by inorganic cements
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- 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
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/23—Acid resistance, e.g. against acid air or rain
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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Abstract
The invention discloses a super-hydrophobic self-cleaning coating for a cement-based surface, which comprises the following raw materials in parts by weight: 1-5 parts of nano silicon dioxide, 2-6 parts of low surface energy substances, 0.5-3 parts of epoxy adhesion promoter and 400-500 parts of cement mortar; compared with common concrete, the super-hydrophobic concrete surface obtained by the invention has self-cleaning capability and corrosion damage resistance, can effectively prevent water drops from adhering to the concrete surface and further immersing into the structure of the concrete surface, obviously improves the durability of the common concrete, and improves the bonding strength between the coating and a substrate by preparing the super-hydrophobic coating from the same material as the concrete; the adopted super-hydrophobic coating has the characteristics of good ultraviolet aging resistance and simple preparation process, and the obtained super-hydrophobic concrete coating has good wear resistance and chemical stability of acid and alkali resistance.
Description
Technical Field
The invention relates to a super-hydrophobic self-cleaning coating, in particular to a super-hydrophobic self-cleaning coating for a cement-based surface and a preparation method of the coating.
Background
The cement base is one of the most widely used building materials at the present stage, and the application fields of the cement base comprise road and railway engineering, canal dam engineering, ocean engineering, mechanical industry, construction of power stations and airports, and the like. However, due to the hydrophilic property of the cement-based material, water drops are adsorbed into the concrete by the capillary action generated by the micropores on the surface, and the performance of the concrete is seriously affected. The surface of the concrete is distributed with nano-to millimeter-scale micropores, and the service life of the concrete is reduced in regions such as coastal engineering, saline soil, cold and the like due to damages such as surface cracking, shedding, acid rain erosion, freeze thawing, corrosion of internal steel bars and the like. Therefore, it is necessary to improve the water-proof and self-cleaning properties of the surface of the cement-based material to improve the durability of the cement-based material. The super-hydrophobic material has important application value in various fields due to the unique characteristics of hydrophobicity, self-cleaning, ice resistance and the like, and is concerned. Related researches on the preparation of the super-hydrophobic material on the surface of the cement-based material at home and abroad, a paper (Science,2015,347:1132-1135) proposes a method for adhering a super-hydrophobic TiO2 coating on the surface of a substrate by using an adhesive to ensure that the substrate obtains the super-hydrophobic characteristic, but the method is difficult to apply on the surface of the cement. Patent CN106087638A discloses a preparation method of a super-hydrophobic anti-freezing composite asphalt surface layer, which is to pour a layer of epoxy curing agent on the asphalt concrete surface, and then pour hydrophobic nano zinc oxide particles to obtain super-hydrophobicity. The paper (Cement & Concrete Composites,2014,52:81-90) cast Concrete in rough PDMS molds to obtain rough structures, which were then sprayed with a hydrophobic coating to obtain superhydrophobicity. The patent CN113880494A provides a super-hydrophobic water-based emulsion aiming at the cement concrete anticorrosion technology, and focuses on the innovation of hydrophobic emulsion modification and a cement anticorrosion system. However, the preparation methods in the above methods are complicated, but all have the problems of poor wear resistance, poor ultraviolet aging resistance and the like.
Therefore, a super-hydrophobic self-cleaning coating applied to the surface of a cement base material is needed, and a super-hydrophobic cement coating with good wear resistance and good ultraviolet resistance can be formed on the surface of the cement base material.
Disclosure of Invention
In view of the above, the invention aims to provide a super-hydrophobic self-cleaning coating and a coating for a cement-based surface and a preparation method thereof, so as to overcome the defects that ordinary concrete is easy to freeze in freezing rain, poor in freeze-thaw resistance and easy to corrode inside, and ordinary super-hydrophobic coatings are poor in ultraviolet resistance and difficult to be practically applied to the surface of the concrete.
The invention discloses a super-hydrophobic self-cleaning coating for a cement-based surface, which comprises the following raw materials in parts by weight: 1-5 parts of nano silicon dioxide, 2-6 parts of low surface energy substances, 0.5-3 parts of epoxy bonding accelerator and 400-500 parts of cement mortar;
further, the coating raw materials comprise the following components in parts by weight: 3 parts of nano silicon dioxide, 4 parts of low surface energy substance, 1.5 parts of epoxy adhesion promoter and 450 parts of cement mortar;
further, the low surface energy substance is n-octyl triethoxysilane;
further, the epoxy adhesion promoter is KH-560;
further, the particle size of the nano silicon dioxide is 25-35 nm.
The preparation method of the super-hydrophobic concrete coating comprises the following steps: the method comprises the steps of dispersing nano-silica in a mixed solution of absolute ethyl alcohol and deionized water by ultrasonic waves uniformly, adjusting the pH value to 4.5-6.5, adding a low-surface-energy substance and an epoxy bonding promoter, stirring uniformly, adding cement mortar, stirring uniformly, coating on the surface of cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
The super-hydrophobic concrete coating is prepared by a preparation method of the super-hydrophobic concrete coating.
The invention has the beneficial effects that: compared with common concrete, the super-hydrophobic self-cleaning coating for the cement-based surface and the preparation method of the coating thereof, disclosed by the invention, have the advantages that the surface of the super-hydrophobic concrete has self-cleaning capability and corrosion damage resistance, water drops can be effectively prevented from being adhered to the surface of the concrete and further being immersed into the structure of the concrete, the durability of the common concrete is obviously improved, and the super-hydrophobic coating is prepared by using the same material as the concrete, so that the bonding strength between the coating and a substrate is improved; the adopted super-hydrophobic coating has the characteristics of good ultraviolet aging resistance and simple preparation process, and the obtained super-hydrophobic concrete coating has good wear resistance and chemical stability of acid and alkali resistance.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is an apparent morphology diagram of the product produced.
Fig. 2 is a result of characterizing a superhydrophobic coating using fourier infrared spectroscopy (FTIR).
FIG. 3 is a static digital photograph and a static contact angle measurement chart of a water drop on a super-hydrophobic concrete coating.
Fig. 4 is a schematic diagram of a superhydrophobic coating self-cleaning process.
Detailed Description
Example one
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 2.5 parts of nano silicon dioxide, 3 parts of low surface energy substances, 1 part of epoxy adhesion promoter and 470 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane;
the epoxy adhesion promoter is KH-560.
(1) Weighing 2.5 parts of silicon dioxide with the particle size of 30nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to keep the pH value of the solution at 4.5-6.5, then adding 3 parts of n-octyl triethoxysilane and 1 part of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min for 30min at the temperature of 45 ℃ to obtain solution A.
(2) 200 parts of M32.5 cement, 230 parts of fine sand (the particle size is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
Example two
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 1.5 parts of nano silicon dioxide, 4 parts of low surface energy substances, 1.5 parts of epoxy adhesion promoter and 450 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane;
the epoxy adhesion promoter is KH-560.
(1) Weighing 1.5 parts of silicon dioxide with the particle size of 25nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to keep the pH value of the solution at 4.5-6.5, then adding 4 parts of n-octyl triethoxysilane and 1.5 parts of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min at the temperature of 50 ℃ for 30min to obtain solution A.
(2) 200 parts of M32.5 cement, 220 parts of fine sand (the particle size is less than 0.6mm) and 30 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
EXAMPLE III
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 4 parts of nano silicon dioxide, 5 parts of low surface energy substance, 2 parts of epoxy adhesion promoter and 400 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 4 parts of silicon dioxide with the particle size of 35nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.5 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to be 4.5-6.5, then adding 5 parts of n-octyl triethoxysilane and 2 parts of silane coupling agent KH-560, and stirring 1.3 parts of acetone in a constant-temperature water bath kettle at the speed of 10r/min and the temperature of 55 ℃ for 30min to obtain solution A.
(2) 200g M32.5.5 cement, 160 parts of fine sand (the grain diameter is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min, and then cement mortar is obtained.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
Example four
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 3 parts of nano silicon dioxide, 3 parts of low surface energy substances, 1.5 parts of epoxy adhesion promoter and 500 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 3 parts of silicon dioxide with the particle size of 35nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to be 4.5-6.5, then adding 3 parts of n-octyl triethoxysilane and 1.5 parts of silane coupling agent KH-560, and stirring 1.5 parts of acetone in a constant-temperature water bath kettle at the speed of 10r/min and the temperature of 55 ℃ for 30min to obtain solution A.
(2) Weighing 250 parts of M32.5 cement, 200 parts of fine sand (the particle size is less than 0.6mm) and 50 parts of water, mixing and stirring uniformly, adding the solution A, placing in a stirrer, and stirring at the rotating speed of 500r/min for 30min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and obtaining the super-hydrophobic concrete coating after the coating is solidified and maintained for 7 days.
EXAMPLE five
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 3 parts of nano silicon dioxide, 4 parts of low surface energy substance, 2 parts of epoxy adhesion promoter and 480 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 3 parts of silicon dioxide with the particle size of 30nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to keep the pH value of the solution at 4.5-6.5, then adding 4 parts of n-octyl triethoxysilane and 2 parts of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min for 30min at the temperature of 45 ℃ to obtain solution A.
(2) 200 parts of M32.5 cement, 230 parts of fine sand (the particle size is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
EXAMPLE six
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 3 parts of nano silicon dioxide, 5 parts of low surface energy substance, 3 parts of epoxy adhesion promoter and 480 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
1) 3 parts of silica having a particle size of 25nm are weighed and placed in a mixture of absolute ethanol and deionized water (ratio 3: 1) after the mixed solution is placed in an ultrasonic cleaner for ultrasonic dispersion for 30min, 0.4 part of concentrated hydrochloric acid solution is dripped to adjust the pH value of the solution to keep the pH value at 4.5-6.5, then 5 parts of n-octyl triethoxysilane and 3 parts of silane coupling agent KH-560 are added, and 1 part of acetone is stirred for 30min at 50 ℃ in a constant temperature water bath at the speed of 10r/min to prepare solution A.
(2) 200 parts of M32.5 cement, 230 parts of fine sand (the particle size is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete until the coating is solidified and cured for 7 days.
EXAMPLE seven
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 3.5 parts of nano silicon dioxide, 3 parts of low surface energy substances, 2 parts of epoxy adhesion promoter and 470 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 3.5 parts of silicon dioxide with the particle size of 30nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to keep the pH value of the solution at 4.5-6.5, then adding 3 parts of n-octyl triethoxysilane and 2 parts of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min for 30min at the temperature of 50 ℃ to obtain solution A.
(2) 200 parts of M32.5 cement, 230 parts of fine sand (the particle size is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
Example eight
According to the super-hydrophobic self-cleaning coating for the cement-based surface, the coating raw materials comprise the following components in parts by weight: 3.5 parts of nano silicon dioxide, 4 parts of low surface energy substance, 1 part of epoxy adhesion promoter and 470 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 3.5 parts of silicon dioxide with the particle size of 30nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4 part of concentrated hydrochloric acid solution to adjust the pH value of the solution to keep the pH value of the solution at 4.5-6.5, then adding 4 parts of n-octyl triethoxysilane and 1 part of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min and the temperature of 55 ℃ for 30min to obtain solution A.
(2) Weighing 180g M32.5.5 cement, 250g fine sand (the particle size is less than 0.6mm) and 40 parts of water, mixing and stirring uniformly, adding the solution A, placing in a stirrer, and stirring for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
Example nine
The super-hydrophobic self-cleaning coating for the cement-based surface comprises the following raw materials in parts by weight: 1 part of nano silicon dioxide, 2 parts of low surface energy substances, 0.5 part of epoxy adhesion promoter and 470 parts of cement mortar; the low surface energy substance is n-octyl triethoxysilane; the epoxy adhesion promoter is KH-560.
(1) Weighing 1 part of silicon dioxide with the particle size of 30nm, placing the silicon dioxide in a mixed solution of absolute ethyl alcohol and deionized water (the ratio is 3: 1), placing the silicon dioxide in an ultrasonic cleaner for ultrasonic dispersion for 30min, dropwise adding 0.4ml of concentrated hydrochloric acid solution to adjust the pH value of the solution to be 4.5-6.5, then adding 2 parts of n-octyl triethoxysilane and 0.5 part of silane coupling agent KH-560, and stirring 1 part of acetone in a constant-temperature water bath kettle at the speed of 10r/min for 30min at the temperature of 45 ℃ to obtain solution A.
(2) 200 parts of M32.5 cement, 230 parts of fine sand (the particle size is less than 0.6mm) and 40 parts of water are weighed, mixed and stirred uniformly, added with the solution A and placed in a stirrer to be stirred for 30min at the rotating speed of 500r/min to obtain cement mortar.
(3) And pouring or brushing the cement mortar on the surface of the cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
The superhydrophobic self-cleaning coating of the sixth embodiment is subjected to a relevant performance test, and the test method adopts a test method known in the art. And the performance effect of the super-hydrophobic self-cleaning coating obtained by the other examples is not much different from that of the sixth example.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A super-hydrophobic self-cleaning coating for cement-based surfaces is characterized in that: the coating comprises the following raw materials in parts by weight: 1-5 parts of nano silicon dioxide, 2-6 parts of low surface energy substances, 0.5-3 parts of epoxy bonding accelerator and 400-500 parts of cement mortar.
2. The superhydrophobic, self-cleaning coating for cementitious surfaces of claim 1, characterized in that: the coating comprises the following raw materials in parts by weight: 3 parts of nano silicon dioxide, 4 parts of low surface energy substance, 1.5 parts of epoxy adhesion promoter and 450 parts of cement mortar.
3. The superhydrophobic, self-cleaning coating for cementitious surfaces of claim 1, characterized in that: the low surface energy substance is n-octyl triethoxysilane.
4. The superhydrophobic, self-cleaning coating for cementitious surfaces as claimed in claim 3, characterized in that: the epoxy adhesion promoter is KH-560.
5. The superhydrophobic, self-cleaning coating for cementitious surfaces as claimed in claim 4, characterized in that: the particle size of the nano silicon dioxide is 25-35 nm.
6. A preparation method of a super-hydrophobic concrete coating is characterized by comprising the following steps: the method comprises the following steps: the method comprises the steps of dispersing nano-silica in a mixed solution of absolute ethyl alcohol and deionized water by ultrasonic waves uniformly, adjusting the pH value to 4.5-6.5, adding a low-surface-energy substance and an epoxy bonding promoter, stirring uniformly, adding cement mortar, stirring uniformly, coating on the surface of cement concrete, and curing for 7 days after the coating is solidified to obtain the super-hydrophobic concrete coating.
7. The superhydrophobic concrete coating of claim 6, wherein: the coating is prepared by the preparation method of the super-hydrophobic concrete coating according to claim 6.
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| CN110304938A (en) * | 2019-07-23 | 2019-10-08 | 东南大学 | A kind of substrate ultra-hydrophobic non-fine concrete and preparation method thereof |
| CN111777381A (en) * | 2020-07-15 | 2020-10-16 | 大连理工大学 | Preparation method of colored super-hydrophobic concrete coating |
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| CN108546054A (en) * | 2018-07-26 | 2018-09-18 | 北京宝辰联合科技股份有限公司 | Permeable face layer mortar of a kind of high-strength automatically cleaning and preparation method thereof |
| CN110304938A (en) * | 2019-07-23 | 2019-10-08 | 东南大学 | A kind of substrate ultra-hydrophobic non-fine concrete and preparation method thereof |
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