A concrete water-based paint and a method for applying the same

Abstract

The application discloses a kind of concrete water-based paint and its construction method.A kind of concrete water-based paint, including component A, component B and component C, the mass ratio of the component A, the component B with the component C is 1:2-10:0.5-2;The A component includes following weight parts of raw materials: tree molecule 0.5-2 parts, cellulose nanocrystal 1-3 parts, water 30-50 parts, dispersing agent 1-3 parts;The B component includes following weight parts of raw materials: resin base material 80-100 parts, film forming agent 0.5-3 parts, water 10-20 parts;The resin base material includes water-based acrylic resin;The component C includes curing agent.The application has the advantages of improving the stability of water-based protective coating on the surface of concrete structure, improving the effect of concrete resistance to chlorides.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a water-based concrete coating and its application method. Background Technology

[0002] Concrete, as the most widely used building material in the world today, is facing an increasing number of structural failures due to insufficient durability, posing a significant challenge to the safety and maintenance of concrete structures. It is generally believed that steel corrosion caused by chloride erosion is the dominant factor leading to the decline in the durability of concrete structures.

[0003] Currently, applying coatings to concrete surfaces for surface protection is one of the important methods to improve the durability of concrete structures. However, most coatings are prone to aging, reducing their effectiveness in improving the chloride resistance of concrete. Furthermore, the coatings currently used to enhance chloride resistance in concrete surface protection are mainly traditional organic solvent-based coatings. The solvents in these coatings are highly volatile, releasing large amounts of toxic organic compounds (VOCs) during production, transportation, and use, which not only pollute the environment but also harm human health. As environmental and health issues gain increasing public attention, the gradual replacement of traditional organic solvent-based coatings is an inevitable trend, and the future development trend of the coating industry will undoubtedly be water-based coatings.

[0004] However, current water-based coatings are mainly used in the field of metal protection, and related research on water-based coatings all places demands on the cleanliness and smoothness of the substrate surface. Concrete differs from metal; the cleanliness and smoothness of concrete surfaces are far inferior to those of metal surfaces. Whether water-based coatings can produce excellent chloride salt resistance for concrete structures is still unknown, and related research and applications are limited. Therefore, there is an urgent need to provide a water-based protective coating that can form a coating on the surface of concrete structures and improve the chloride salt resistance of concrete. Summary of the Invention

[0005] In order to improve the stability of water-based protective coatings on concrete structures and enhance the chloride resistance of concrete structures, this application provides a water-based concrete coating and its application method.

[0006] In a first aspect, this application provides a water-based coating for concrete, employing the following technical solution:

[0007] A water-based concrete coating includes component A, component B, and component C, wherein the mass ratio of component A, component B, and component C is 1:2-10:0.5-2.

[0008] Component A comprises the following raw materials in parts by weight: 0.5-2 parts dendritic molecules, 1-3 parts cellulose nanocrystals, 30-50 parts water, and 1-3 parts dispersant;

[0009] Component B comprises the following raw materials in parts by weight: 80-100 parts resin base, 0.5-3 parts film-forming agent, and 10-20 parts water; wherein the resin base comprises water-based acrylic resin.

[0010] Component C includes a curing agent.

[0011] First, through the synergy between dendritic molecules and cellulose nanocrystals, the cellulose nanocrystals can adhere to the dendritic molecules like "tree branches," forming a three-dimensional network structure rich in hydroxyl groups. These hydroxyl groups can bond with silicon in the concrete substrate, improving the stability of the interface between the waterborne coating and the concrete substrate, thereby reducing the degree of water penetration and erosion by harmful substances during the service life of the waterborne coating. Second, the dendritic molecules also improve the dispersion performance of cellulose nanocrystals in component B and the waterborne coating. Furthermore, the branched "tree branch" structure of the cellulose nanocrystals provides longitudinal bonding and fibrous reinforcement for the waterborne coating, further strengthening and toughening it. Finally, the dendritic molecules and cellulose nanocrystal complexes in water-based coatings can penetrate into the concrete substrate during application, increasing the density and porosity of the concrete substrate. The combined effect of these two factors can effectively improve the crack resistance of the water-based coating on the concrete substrate. In addition, the hydroxyl functional groups in the cellulose nanocrystals can form hydrogen bonds or electrostatic forces with chloride ions infiltrating the water-based coating, allowing chloride ions to be adsorbed onto the branched structure surface of the cellulose nanocrystals. The combined filling effect of these two factors can further reduce water penetration and the erosion of harmful substances, while also possessing good resistance to chloride ions and carbonation, thus improving the application stability of water-based coatings and the chloride salt resistance of concrete.

[0012] Preferably, the resin base material further includes an aqueous fluorocarbon resin.

[0013] After being applied to a concrete substrate, waterborne fluorocarbon resin undergoes continuous cross-linking and curing as moisture and additives evaporate, forming a dense coating that further enhances the waterproof performance and resistance to chloride ion corrosion of the waterborne coating.

[0014] Preferably, the waterborne fluorocarbon resin accounts for 5%-10% of the mass of the resin base.

[0015] By controlling the proportion of waterborne fluorocarbon resin in the resin base, the waterborne coating can achieve both excellent density and excellent "breathing" performance, allowing water vapor in the concrete to evaporate out of the coating, avoiding the adverse effects of water vapor not evaporating on the concrete structure, and improving the durability of the concrete.

[0016] Preferably, the dendritic molecule includes at least one of PAMAM dendritic molecule, aryl ether dendritic molecule, and ferrocene-based dendritic molecule.

[0017] Preferably, the tree-shaped molecule is a PAMAM tree-shaped molecule.

[0018] Dendritic molecules have been industrialized, especially when PAMAM dendritic molecules are used as one of the raw materials. The resulting components have good compatibility, especially in improving the stability of the three-dimensional network structure formed by dendritic molecules and cellulose nanocrystals. During the drying process, it can significantly reduce the shrinkage rate of water-based coatings and improve the adhesion stability of water-based coatings on concrete substrates.

[0019] Preferably, the cellulose nanocrystals have a diameter of 5-15 nm and a length of 50-300 nm.

[0020] By controlling the diameter and length of cellulose nanocrystals, the aspect ratio of cellulose nanocrystals can be maintained at a high level, thereby increasing their specific surface area. On the one hand, this can improve the stability of the three-dimensional network structure formed by cellulose nanocrystals and dendritic molecules. On the other hand, it can improve the adsorption effect of cellulose nanocrystals on chloride ions, thereby improving the adhesion stability and chloride salt resistance of water-based coatings on concrete substrates.

[0021] Preferably, the dispersant comprises ammonium polycarboxylate; the film-forming agent comprises at least one of propylene glycol, dodecyl alcohol ester, propylene glycol ethyl ether, hexanediol butyl ether acetate, and propylene glycol butyl ether; and the curing agent comprises at least one of aqueous isocyanate and polyurethane.

[0022] Secondly, this application provides a method for preparing a water-based coating for concrete, employing the following technical solution:

[0023] A method for preparing a water-based coating for concrete includes the following steps:

[0024] S1: Mix and disperse the raw materials constituting component A to obtain a cellulose nanocrystal / dendritic molecule mixture; mix and stir the raw materials constituting component B to obtain a pretreated mixture;

[0025] S2: Add the cellulose nanocrystal / dendritic molecule mixture to the pretreatment mixture in proportion, heat and stir, then continue to add component C and stir to obtain the concrete water-based coating.

[0026] Preferably, the reaction temperature in S1 is 30-45℃, the dispersion time is 0.5-1h, and the stirring time is 30-50min; the heating temperature in S2 is 40-50℃, the stirring time is 20-40min, and the stirring time after adding component C is 5-15min.

[0027] Thirdly, this application provides a method for applying a water-based coating to concrete, employing the following technical solution:

[0028] A method for applying a water-based coating to concrete, the method comprising the following steps:

[0029] Step 1: Wet the concrete substrate;

[0030] Step 2: When there is no standing water on the substrate, apply the water-based concrete coating to the concrete substrate, and allow it to dry and cure to form a water-based coating on the concrete substrate.

[0031] In step two, when the construction temperature is greater than 38°C, the water-based coating is sprayed with water every 6-15 hours.

[0032] Compared to existing water-based coatings, the water-based coating provided by this invention enables the water-based coating layer to have higher bonding strength with the concrete substrate in both the early and later stages, thereby improving construction efficiency, shortening the construction period, and saving construction costs.

[0033] Preferably, the thickness of the water-based coating formed on the surface of the concrete by the water-based concrete coating is 55-100 μm.

[0034] At this thickness, the water-based coating provides excellent waterproofing and chlorine resistance, improving the durability of concrete. Detailed Implementation

[0035] To better understand and implement this invention, the technical solution of the present invention will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Unless otherwise defined, 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 pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0037] Unless otherwise stated, all numerical values ​​for the amounts of expressed components, reaction conditions, etc., used in the specification and claims are to be understood as being modified by the term "about". Therefore, unless otherwise indicated, the numerical parameters set forth herein are approximate values ​​that can be varied to obtain the desired performance.

[0038] The word “and / or” as used in this article refers to one or all of the elements mentioned.

[0039] The terms "include" and "contain" as used in this article cover both cases where only the mentioned elements exist and cases where other unmentioned elements exist in addition to the mentioned elements.

[0040] All percentages in this invention are weight percentages, unless otherwise stated.

[0041] Unless otherwise stated, the terms “a,” “an,” “an,” and “the” as used in this specification are intended to include “at least one” or “one or more.” For example, “a component” refers to one or more components, and therefore more than one component may be considered and may be employed or used in the implementation of the described embodiments.

[0042] Example 1

[0043] 1. Preparation of water-based coatings

[0044] Component A includes: 1 part PAMAM dendritic molecules, 2 parts cellulose nanocrystals with a diameter of 5-15nm and a length of 50-300nm, 40 parts water, and 2 parts polycarboxylate ammonium salt.

[0045] Component B comprises: 90 parts of waterborne acrylic resin, 1 part of propylene glycol, and 15 parts of water;

[0046] Component C is a curing agent, water-based isocyanate.

[0047] The preparation of water-based coatings includes the following steps:

[0048] S1: Mix the raw materials of component A and ultrasonically disperse them at 40℃ for 0.8h to obtain a cellulose nanocrystal / dendritic molecule mixture; mix the raw materials of component B and stir for 40min to obtain a pretreated mixture;

[0049] S2: Add the cellulose nanocrystal / dendritic molecule mixture to the pretreatment mixture according to the proportion, heat and stir at 45°C for 30 min, then add component C and stir for 10 min. The mass ratio of component A, component B and component C is 1:7:0.6 to obtain the concrete water-based coating.

[0050] 2. Application methods of water-based coatings on concrete substrates

[0051] When the construction temperature is below 38℃

[0052] Step 1: Wet the concrete substrate;

[0053] Step 2: When there is no standing water on the substrate, apply the water-based concrete coating to the concrete substrate. After drying and curing, a water-based coating with a thickness of 75μm will be formed on the concrete substrate.

[0054] Example 2

[0055] 1. Preparation of water-based coatings

[0056] Component A includes: 0.5 parts of aromatic ether dendritic molecules, 1 part of cellulose nanocrystals with a diameter of 5-15 nm and a length of 50-300 nm, 30 parts of water, and 1 part of polycarboxylate ammonium salt.

[0057] Component B comprises: 80 parts of waterborne acrylic resin, 0.5 parts of dodecyl alcohol ester, and 10 parts of water;

[0058] Component C is a curing agent, water-based isocyanate.

[0059] The preparation of water-based coatings includes the following steps:

[0060] S1: Mix the raw materials of component A and ultrasonically disperse them at 45℃ for 0.5h to obtain a cellulose nanocrystal / dendritic molecule mixture; mix the raw materials of component B and stir for 50min to obtain a pretreated mixture;

[0061] S2: Add the cellulose nanocrystal / dendritic molecule mixture to the pretreatment mixture according to the proportion, heat and stir at 50°C for 20 min, then add component C and stir for 15 min. The mass ratio of component A, component B and component C is 1:5:0.3 to obtain the concrete water-based coating.

[0062] 2. Application methods of water-based coatings on concrete substrates

[0063] When the construction temperature is below 38℃

[0064] Step 1: Wet the concrete substrate;

[0065] Step 2: When there is no standing water on the substrate, apply the water-based concrete coating to the concrete substrate. After drying and curing, a water-based coating with a thickness of 55μm will be formed on the concrete substrate.

[0066] Example 3

[0067] 1. Preparation of water-based coatings

[0068] Component A includes: 2 parts of ferrocene-based dendritic molecules, 3 parts of cellulose nanocrystals with a diameter of 5-15 nm and a length of 50-300 nm, 50 parts of water, and 3 parts of polycarboxylate ammonium salt.

[0069] Component B comprises: 100 parts of waterborne acrylic resin, 3 parts of propylene glycol ethyl ether, and 20 parts of water;

[0070] Component C is a curing agent, water-based isocyanate.

[0071] The preparation of water-based coatings includes the following steps:

[0072] S1: Mix the raw materials of component A and ultrasonically disperse them at 30℃ for 1 hour to obtain a cellulose nanocrystal / dendritic molecule mixture; mix the raw materials of component B and stir for 30 minutes to obtain a pretreated mixture;

[0073] S2: Add the cellulose nanocrystal / dendritic molecule mixture to the pretreatment mixture according to the proportion, heat and stir at 40°C for 40 min, then add component C and stir for 5 min. The mass ratio of component A, component B and component C is 1:10:1 to obtain the concrete water-based coating.

[0074] 2. Application methods of water-based coatings on concrete substrates

[0075] When the construction temperature is higher than 38℃

[0076] Step 1: Wet the concrete substrate;

[0077] Step 2: When there is no standing water on the substrate, apply the water-based concrete coating to the concrete substrate. After drying and curing, a water-based coating with a thickness of 100μm will be formed on the concrete substrate. During the curing process, spray water on the water-based coating every 8 hours.

[0078] Example 4

[0079] The difference between this embodiment and Embodiment 1 is that the resin base material also includes waterborne fluorocarbon resin, and the waterborne fluorocarbon resin accounts for 8% of the mass of the resin base material; the rest of the components are consistent with Embodiment 1.

[0080] Example 5

[0081] The difference between this embodiment and Embodiment 1 is that the resin base material also includes waterborne fluorocarbon resin, and the waterborne fluorocarbon resin accounts for 5% of the mass of the resin base material; the rest of the components are consistent with Embodiment 1.

[0082] Example 6

[0083] The difference between this embodiment and Embodiment 1 is that the resin base material also includes waterborne fluorocarbon resin, and the waterborne fluorocarbon resin accounts for 10% of the mass of the resin base material; the rest of the components are consistent with Embodiment 1.

[0084] Example 7

[0085] The difference between this embodiment and embodiment 4 is that an equal weight of waterborne polyurethane resin is used instead of waterborne fluorocarbon resin; the rest is the same as in embodiment 4.

[0086] Example 8

[0087] The difference between this embodiment and Embodiment 1 is that the diameter of the cellulose nanocrystals is 15-30 nm; the rest are the same as in Embodiment 1.

[0088] Example 9

[0089] The difference between this embodiment and Embodiment 1 is that spherical nanocellulose of equal weight is used instead of cellulose nanocrystals in Embodiment 1; the rest are the same as in Embodiment 1.

[0090] Comparative Example 1

[0091] The difference between this comparative example and Example 1 is that graphene of equal weight is used instead of the dendritic molecules in Example 1; the rest are the same as in Example 1.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is that an equal weight of cellulose nanocrystals is used instead of the dendritic molecules in Example 1; the rest are the same as in Example 1.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 1 is that dendritic molecules of equal weight are used instead of cellulose nanocrystals in Example 1; the rest are the same as in Example 1.

[0096] Comparative Example 4

[0097] The difference between this comparative example and Example 1 is that the mass ratio of component A, component B and component C is 1:15:0.5; the rest are the same as in Example 1.

[0098] Comparative Example 5

[0099] The difference between this comparative example and Example 1 is that the mass ratio of component A, component B and component C is 1:0.5:1; the rest are the same as in Example 1.

[0100] Comparative Example 6

[0101] The difference between this comparative example and Example 1 is that commercially available water-based epoxy coatings for concrete are used.

[0102] Test methods

[0103] I. Adhesion Performance Test of Water-based Coatings

[0104] 1.1 Waterborne Coating Adhesion Strength Test

[0105] The bond strength of the water-based coatings on the concrete substrates in Examples 1-10 and Comparative Examples 1-4 was tested. The specific test methods were carried out in accordance with the methods specified in GB / T 16777-2008, and the test data are recorded in Table 1.

[0106] 1.2 Adhesion test of water-based coating composite

[0107] The adhesive strength of the water-based coatings in Examples 1-10 and Comparative Examples 1-4 was tested. The specific test method was in accordance with the method in JC / T 2428-2017. The sample was suspended vertically, and then a 500g weight was suspended below the water-based coating. The time required for the roll material to completely detach from the substrate was recorded. Each sample was tested five times, and the test result was the average of the five measurements. The test data were recorded in Table 1.

[0108] II. Water Resistance Test of Water-based Coatings

[0109] The water resistance of the water-based coatings on the concrete substrates in Examples 1-10 and Comparative Examples 1-4 was tested. The specific test method was carried out in accordance with GB / T 1733-93. Three samples were treated with the same coating process under the same conditions and sealed with paraffin. Two-thirds of the length of the sample to be tested was placed in a glass water tank filled with distilled water and soaked for 240 hours. The morphology of the sample was checked and recorded, and the presence of discoloration, blistering, peeling and cracking was recorded. The sample was considered qualified if at least two of the three samples met the standard. The test results are recorded in Table 1.

[0110] III. Chloride Resistance Test of Concrete

[0111] Salt spray resistance tests were conducted on the concrete with water-based coatings in Examples 1-10 and Comparative Examples 1-4, following the specific test methods specified in GB / T1771-2007. The duration of salt spray resistance was recorded in Table 1.

[0112] Table 1

[0113] Serial Number Bond strength / MPa Composite tackiness / min Water resistance Salt spray resistance / h Example 1 0.88 88 No abnormalities 1465 Example 2 0.85 85 No abnormalities 1453 Example 3 0.86 86 No abnormalities 1458 Example 4 0.95 89 No abnormalities 1505 Example 5 0.93 87 No abnormalities 1487 Example 6 0.92 88 No abnormalities 1492 Example 7 0.83 82 No abnormalities 1456 Example 8 0.80 79 No abnormalities 1395 Example 9 0.82 80 No abnormalities 1421 Comparative Example 1 0.75 71 No abnormalities 1126 Comparative Example 2 0.68 66 foaming 1105 Comparative Example 3 0.65 62 foaming 953 Comparative Example 4 0.69 71 Bubbling and peeling 987 Comparative Example 5 0.53 51 Bubbling and peeling 812 Comparative Example 6 0.78 75 foaming 1250

[0114] Based on Examples 1-3, Comparative Examples 1-3, 6, and Table 1, it can be seen that the combined use of dendritic molecules and nanocrystalline cellulose can significantly improve the adhesion strength and composite tack of the water-based coating to the concrete substrate. This is because, on the one hand, the electrostatic repulsion between dendritic molecules allows them to maintain independent dispersion. When used in conjunction with cellulose nanocrystals, this improves the dispersion performance of the cellulose nanocrystals in the water-based coating. Furthermore, the cellulose nanocrystals can form a branch-like structure on the surface of the dendritic molecules, creating a three-dimensional network structure rich in hydroxyl groups. These branch-like structures can interlock, providing longitudinal and lateral connections for the water-based coating, improving the stability of the water-based coating on the concrete substrate, and thus enhancing the water resistance and chloride erosion resistance of the concrete. Simultaneously, the hydroxyl groups in the cellulose nanocrystals can not only bond with silicon in the concrete surface, further improving the stability of the water-based coating, but also combine with chloride ions under electrostatic forces, further enhancing the water resistance and chloride erosion resistance of the water-based coating. More importantly, the nanocomplex formed by cellulose nanocrystals and dendritic molecules can penetrate into the concrete substrate after the water-based coating is applied, which will further increase the density of the concrete substrate and help to further improve the concrete's resistance to chloride salt erosion.

[0115] Based on Example 1, Comparative Examples 4-5 and Table 1, it can be seen that by controlling the ratio of components A, B and C, the compound formed by dendritic molecules and cellulose nanocrystals can be uniformly dispersed in the water-based slurry, which helps to improve the bonding strength and composite adhesion of the water-based coating, thereby improving the water resistance and chloride salt erosion resistance of concrete.

[0116] Combining Examples 1, 4-7, and Table 1, it can be seen that the combination of waterborne fluorocarbon resin and waterborne acrylic resin (Examples 4-6) can further improve the bonding strength and composite tack of the waterborne coating. However, the combination of waterborne polyurethane resin and acrylic resin (Example 7) did not produce the same improvement in bonding strength and composite tack as in Examples 4-6. This is because, on the one hand, waterborne fluorocarbon resin and waterborne acrylic resin have good compatibility; on the other hand, the waterborne fluorocarbon resin continuously cross-links and cures during the drying process of the waterborne coating to form a waterborne coating, thereby improving the bonding strength and composite tack to a certain extent. Furthermore, by selecting a suitable proportion of waterborne fluorocarbon resin, the density of the waterborne coating can be improved without reducing its "breathing" performance. This allows moisture in the concrete structure to evaporate, preventing stress distribution within the concrete structure from being affected by internal moisture retention. This also avoids deformation or micro-cracks on the concrete substrate due to changes in internal stress, indirectly improving the bonding stability between the waterborne coating and the concrete substrate. This allows the waterborne coating to remain on the concrete substrate surface for a long time, helping to improve the concrete's water resistance and chloride salt corrosion resistance.

[0117] Based on Examples 1, 8-9 and Table 1, it can be seen that when the aspect ratio of cellulose nanocrystals decreases, the branch structure in the three-dimensional network structure formed by the combination of dendritic molecules and cellulose nanocrystals will disappear. This reduces the contribution of cellulose nanocrystals to the transverse and longitudinal forces of the water-based coating to a certain extent, thereby reducing the bonding strength and composite tack of the water-based coating. Correspondingly, the water resistance and chloride salt resistance of the concrete also decrease slightly.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention, but such modifications or substitutions are all within the scope of protection of the present invention.

Claims

1. A concrete water-based paint, characterized by: The component A, the component B and the component C, a mass ratio of the component A, the component B and the component C is 1:5-10:0.5-2; The component A comprises raw materials in the following weight parts: dendritic molecules 0.5-2 parts, cellulose nanocrystals 1-3 parts, water 30-50 parts, dispersants 1-3 parts; The component B comprises raw materials in the following weight parts: resin base 80-100 parts, film forming agents 0.5-3 parts, water 10-20 parts; the resin base comprises water-based acrylic resin; The component C comprises curing agents; The dendritic molecules comprise at least one of PAMAM dendritic molecules, aryl ether dendritic molecules and ferrocene-based dendritic molecules.

2. A concrete water-based paint according to claim 1, characterized in that: The resin base further comprises water-based fluorocarbon resin.

3. A concrete water-based paint according to claim 2, characterized in that: The water-based fluorocarbon resin accounts for 5%-10% of the mass of the resin base.

4. The concrete water-based paint according to claim 1, characterized by: The cellulose nanocrystals have a diameter of 5-15 nm and a length of 50-300 nm.

5. The concrete water-based paint according to claim 1, characterized by: The dispersants comprise polycarboxylic acid ammonium salt; the film forming agents comprise at least one of propylene glycol, dodecanol ester, propylene glycol ethyl ether, hexanediol butyl ether acetate and propylene glycol butyl ether; and the curing agents comprise water-based isocyanate.

6. A method of preparing a concrete water-based paint according to any one of claims 1-5, characterized in that: The method comprises the following steps: S1: mixing and dispersing raw materials constituting the component A to obtain a cellulose nanocrystal / dendritic molecule mixture; mixing and stirring raw materials constituting the component B to obtain a pretreatment mixture; S2: adding the cellulose nanocrystal / dendritic molecule mixture to the pretreatment mixture in a certain proportion, heating and stirring, then adding the component C and stirring to obtain the concrete water-based paint.

7. A concrete water-based paint according to claim 6, characterized in that: The reaction temperature in S1 is 30-45℃; and the heating temperature in S2 is 40-50℃.

8. A method of applying a concrete water-based coating according to any one of claims 1-5, characterized in that: The construction method comprises the following steps: Step one: wetting the base surface of the concrete; Step two: when the base surface is free of water, applying the concrete water-based paint on the base surface of the concrete, drying and curing to form a water-based coating on the base surface of the concrete; In the step two, when the construction temperature is greater than 38℃, the water-based coating is subjected to water spraying treatment every 6-15 hours.

9. The method of claim 8, wherein the concrete water-based paint is applied to the surface of the concrete structure in a thickness of 0.1 to 0.3 mm. The thickness of the water-based coating formed by the concrete water-based paint on the surface of the concrete is 55-100 μm.