Spraying type water-based asphalt paint waterproof coating as well as preparation method and application thereof

Abstract

The invention belongs to the field of waterproof anticorrosive paint, and discloses spraying type water-based asphalt paint waterproof paint as well as a preparation method and application thereof. The waterproof coating comprises the following components: a high Tg acrylic emulsion, a polyethylene wax emulsion, a filler, emulsified asphalt, an antifoaming agent, a bactericide, a flash rust inhibitor, a cellulose diluted aqueous solution, a thickener diluted aqueous solution, and at least one of an optional multifunctional regulator, a dispersant and a pigment. The high-Tg (slightly hard) acrylic emulsion and polyethylene wax emulsion compounded system is used, and the content of the polyethylene wax emulsion is properly increased, so that the tensile strength, hardness and flexibility of a paint film and the adhesive force between the paint film and a base material can be remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the field of waterproof and anti-corrosion coatings, and more specifically, relates to a spray-type water-based asphalt waterproof coating and a preparation method and application thereof. Background Art

[0002] As a carrier of oil and gas, buried pipelines are one of the important facilities of ground engineering and the link between upstream resources and downstream users. However, in actual use, pipelines may be perforated due to corrosion, resulting in oil leakage, environmental pollution, and even fire incidents. This is likely to cause environmental safety and economic problems. With the rapid development of urban construction and the construction industry, the use of buried pipelines has increased year by year. The market for related pipeline engineering is also expanding, and higher and higher requirements are placed on pipeline anti-corrosion technology.

[0003] Generally, the corrosion problem of buried steel pipelines is mainly chemical corrosion or electrochemical corrosion in the soil environment, which is easily affected by many influencing factors, including soil type, soil water content, dissolved salt ions, pH value, etc., which can cause corrosion to buried pipelines.

[0004] Anti-corrosion coating is a material used on the surface of metal substrates that has both waterproof and anti-corrosion properties. Under certain specific environments, the coating inhibits corrosion damage to the surface of the substrate through its waterproof function.

[0005] At present, the anti-corrosion coatings for buried pipeline coatings are mainly divided into epoxy resin anti-corrosion coatings, urushiol anti-corrosion coatings, polyurethane anti-corrosion coatings, olefin resin anti-corrosion coatings, and perchlorethylene resin anti-corrosion coatings. These anti-corrosion coatings are two-component oil-based systems that need to be compounded with a curing agent to cure into a film to play a role in corrosion resistance and erosion resistance. However, the volatilization of a large amount of organic solvents during the drying and curing process will cause air and soil pollution.

[0006] Therefore, it is particularly important to develop water-based anti-corrosion coatings to solve the problems of high price, limited application field, poor adhesion, etc. At the same time, it is necessary to develop water-based asphalt paints with durability, high toughness, high density, low permeability, and strong adhesion to the substrate to solve the application performance problems of the paint film in the use environment, such as damage, cracking, bulging, medium penetration, and shedding from the substrate surface, increase the service life, and improve the construction application performance and mechanical properties. Catering to the development trend of anti-corrosion technology with high performance, composite, long service life and good economy of anti-corrosion materials is one of the technical problems that need to be solved at present. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies of the prior art and to provide a spray-type water-based asphalt waterproof coating and a preparation method and application thereof. g(Hard) Acrylic emulsion and polyethylene wax emulsion compound system, moderately increasing the content of polyethylene wax emulsion, can significantly improve the tensile strength, hardness, flexibility and adhesion of the paint film to the substrate.

[0008] In order to achieve the above-mentioned object, the first aspect of the present invention provides a sprayable water-based asphalt paint waterproof coating, the waterproof coating comprising the following components: high T g Acrylic emulsion, polyethylene wax emulsion, filler, emulsified asphalt, defoamer, bactericide, flash rust preventer, diluted cellulose aqueous solution, diluted thickener aqueous solution, and optionally at least one of a multifunctional regulator, a dispersant and a pigment.

[0009] According to the present invention, preferably, the high T g The glass transition temperature of acrylic emulsion is 15-19°C.

[0010] In the prior art, generally speaking, an emulsion whose critical temperature point from a rigid glass state to a soft rubber state is at room temperature is called a high T emulsion. g (hard) emulsion. Combined with the performance and construction performance of the material, the glass transition temperature of acrylic emulsion ≥15℃ is high T g (Hard) acrylic emulsion. As a preferred embodiment, the present invention uses acrylic emulsion with a glass transition temperature of (17±2)°C.

[0011] According to the present invention, preferably, the waterproof coating comprises the following components in parts by weight: high T g 70-90 parts of acrylic emulsion, 0.1-20 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted aqueous solution of cellulose, 0.5-6 parts of diluted aqueous solution of thickener, 0-1 parts of multifunctional regulator, 0-1 parts of dispersant and 1-3 parts of pigment.

[0012] According to the present invention, preferably, the waterproof coating comprises the following components in parts by weight: high T g 70-85 parts of acrylic emulsion, 1-15 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted aqueous solution of cellulose, 0.5-6 parts of diluted aqueous solution of thickener, 0-1 parts of multifunctional regulator, 0-1 parts of dispersant and 1-3 parts of pigment.

[0013] According to the present invention, preferably, the waterproof coating comprises the following components in parts by weight: high T g70-85 parts of acrylic emulsion, 1-15 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted aqueous solution of cellulose, 0.5-6 parts of diluted aqueous solution of thickener, 0.1-0.8 parts of multifunctional regulator, 0.1-0.8 parts of dispersant and 1-3 parts of pigment.

[0014] According to the present invention, preferably, the filler is silicon micropowder and / or wollastonite powder.

[0015] According to the present invention, preferably, the emulsified asphalt is anionic emulsified asphalt.

[0016] According to the present invention, preferably, the defoaming agent is an organosilicon defoaming agent and / or a polyether-modified organosilicon defoaming agent.

[0017] According to the present invention, preferably, the fungicide is at least one of isothiazolinone derivatives, substituted phenols and heterocyclic compounds.

[0018] According to the present invention, preferably, the flash rust inhibitor is at least one of a non-ionic organic polymer flash rust inhibitor, a corrosion inhibitor polymer and an organic compound activator.

[0019] According to the present invention, preferably, the diluted cellulose aqueous solution is prepared by mixing cellulose with water, and the mass ratio of cellulose to water is 1:(6-7).

[0020] According to the present invention, preferably, the cellulose is hydroxyethyl cellulose.

[0021] According to the present invention, preferably, the thickener diluted aqueous solution is prepared by mixing the thickener with water, and the mass ratio of the thickener to water is 1:(1-2).

[0022] According to the present invention, preferably, the thickener is an alkali swelling thickener.

[0023] According to the present invention, preferably, the multifunctional regulator is an amine polymer.

[0024] According to the present invention, preferably, the dispersant is a dispersant based on ammonium polyacrylate and / or a fatty alcohol polyoxyethylene ether sulfate dispersant.

[0025] According to the present invention, preferably, the pigment is high-color carbon black.

[0026] The second aspect of the present invention provides a method for preparing the spray-type water-based asphalt waterproof coating, comprising the following steps:

[0027] S1: The high T gAcrylic emulsion, polyethylene wax emulsion, fungicide, flash rust preventer, filler, emulsified asphalt, defoamer, optional multifunctional regulator, optional dispersant and optional pigment are mixed and stirred to obtain a component mixture;

[0028] S2: The component mixture is mixed with the diluted cellulose aqueous solution and the diluted thickener aqueous solution to obtain the sprayable water-based asphalt waterproof coating.

[0029] According to the present invention, preferably, in step S1:

[0030] (1) High T g Acrylic acid emulsion, polyethylene wax emulsion, fungicide, anti-flash rust agent, optional multifunctional regulator and optional dispersant are mixed and stirred to obtain a first mixture;

[0031] (2) mixing the first mixture with a filler to obtain a second mixture;

[0032] (3) mixing the second mixture with emulsified asphalt to obtain a third mixture;

[0033] (4) The third mixture is mixed and stirred with a defoamer and an optional pigment to obtain the component mixture.

[0034] According to the present invention, preferably, in step (1), the stirring speed is 400-500 rpm and the stirring time is 10-15 min;

[0035] In step (2), the stirring speed is 700-800 rpm and the stirring time is 40-50 min;

[0036] In the step (3), the stirring speed is 400-500 rpm and the stirring time is 10-15 min;

[0037] In the step (4), the stirring speed is 300-500 rpm and the stirring time is 20-40 min.

[0038] According to the present invention, preferably, in step S2, the stirring speed is 800-1200 rpm, and the stirring time is 40-50 min.

[0039] The third aspect of the present invention provides the use of the spray-type water-based asphalt waterproof coating in the spray construction of buried pipelines.

[0040] The present invention will high T g(Hard) Acrylic emulsion and polyethylene wax emulsion are used in combination. During the drying process of the paint film, the wax component will gradually migrate to the surface of the paint film, gradually forming a wax film on the surface of the paint film. This wax film can make the paint surface anti-adhesion, and at the same time produce synchronous effects such as anti-wear, anti-scratch, high strength and high hardness, thereby improving the surface properties of the paint film.

[0041] The beneficial effects of the technical solution of the present invention are as follows:

[0042] The present invention uses high T g (Hard) Acrylic emulsion and polyethylene wax emulsion compound system, moderately increasing the content of polyethylene wax emulsion, can significantly improve the tensile strength, hardness, flexibility and adhesion of the paint film to the substrate.

[0043] The spray-type water-based asphalt waterproof paint of the present invention is sprayed on the surface of a metal substrate such as a buried pipeline. After being dried, it can effectively resist the external forces generated by natural environments such as wind, soil, sewage and rainwater under the use conditions, avoid cracking, bulging, deformation and shedding of the paint film from the surface of the substrate, and effectively improve the aging resistance, durability, density, adhesion and toughness of the paint film. It further prevents the chemical corrosion and electrochemical corrosion of the buried pipeline caused by external factors such as soil microorganisms, water, dissolved salt ions, pH value, etc., and truly solves the engineering application performance problems such as anti-corrosion and anti-rust.

[0044] The one-component sprayable water-based asphalt waterproof coating of the present invention does not require a curing agent and is cured and reacted to form a film at room temperature through water volatilization.

[0045] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0047] In the following embodiments and comparative examples:

[0048] High T g The acrylic emulsion was purchased from: Badfu Group Co., Ltd., model FS-310.

[0049] The polyethylene wax emulsion was purchased from Shanghai Ruile Chemical Co., Ltd., model number 937.

[0050] Filler: Silica powder was purchased from Lingshou County Haibin Mineral Products Trading Co., Ltd., with a model of 1250 mesh; wollastonite powder was purchased from Dachun (Hebei) Building Materials Technology Co., Ltd., with a model of 1250 mesh.

[0051] The emulsified asphalt is commercially available anionic emulsified asphalt.

[0052] The defoaming agent is a silicone defoaming agent purchased from Puwei New Material Technology Co., Ltd., model DF-9040.

[0053] The fungicide is an isothiazolinone derivative purchased from Green Union (Jining) Chemical Technology Co., Ltd., model TY-30B.

[0054] The anti-flash rust agent is a non-ionic organic polymer anti-flash rust agent purchased from Shanghai Tianyu Chemical Technology Co., Ltd., model number SIN2100.

[0055] The cellulose is hydroxyethyl cellulose HEC, purchased from Guangzhou Runhong Chemical Co., Ltd., model 250HBR.

[0056] The thickener is an alkali swelling thickener purchased from Rohm and Haas Company with a brand number of ASE-60.

[0057] The multifunctional regulator is an amine high molecular polymer purchased from Qingdao Enze Chemical Co., Ltd., model AMP95.

[0058] The dispersant is a dispersant based on ammonium polyacrylate, purchased from BYK, with the brand name BYK-190.

[0059] The pigment is high-color carbon black purchased from Ruiyat (Tianjin) Chemical Co., Ltd., model T619.

[0060] Example 1

[0061] The present embodiment provides a spray-type water-based asphalt paint waterproof coating, which includes the following components in parts by weight: 80 parts of high Tg acrylic emulsion, 2 parts of polyethylene wax emulsion, filler 1 (50 parts of silicon micropowder), filler 2 (50 parts of wollastonite powder), 160 parts of emulsified asphalt, 5 parts of defoamer, 1 part of bactericide, 4 parts of flash rust inhibitor, 15 parts of cellulose diluted aqueous solution (prepared by mixing cellulose with water, the mass ratio of cellulose to water is 1:6), 5 parts of thickener diluted aqueous solution (prepared by mixing thickener with water, the mass ratio of thickener to water is 1:1), 0.5 parts of multifunctional regulator, 0.5 parts of dispersant and 2.5 parts of pigment.

[0062] This embodiment also provides a method for preparing the spray-type water-based asphalt waterproof coating, comprising the following steps:

[0063] S1: Set high T gAcrylic emulsion, polyethylene wax emulsion, fungicide, flash rust inhibitor, multifunctional regulator and dispersant are mixed evenly and placed under a mechanical stirrer for shear dispersion at 500 rpm for 10 minutes to obtain a first mixture;

[0064] The first mixture was stirred with filler 1 and filler 2 at a stirring speed of 700 rpm for 40 min to obtain a second mixture;

[0065] The second mixture and the emulsified asphalt were stirred at a stirring speed of 500 rpm for 10 min to obtain a third mixture;

[0066] The third mixture, the defoamer and the pigment were stirred at a stirring speed of 500 rpm for 20 min, and then stirred at a stirring speed of 300 rpm for 5 min to obtain the component mixture;

[0067] S2: Stir the component mixture, the cellulose diluted aqueous solution and the thickener diluted aqueous solution at a stirring speed of 1200 rpm for 40 minutes to obtain the spray-type water-based asphalt waterproof coating.

[0068] Example 2

[0069] The difference between this embodiment and embodiment 1 is that the amount of polyethylene wax emulsion is 4 parts, and the rest is the same as embodiment 1.

[0070] Example 3

[0071] The difference between this embodiment and embodiment 1 is that the amount of polyethylene wax emulsion is 8 parts, and the rest is the same as embodiment 1.

[0072] Example 4

[0073] The difference between this embodiment and embodiment 1 is that the amount of polyethylene wax emulsion is 12 parts, and the rest is the same as embodiment 1.

[0074] Comparative Example 1

[0075] The difference between this comparative example and Example 1 is that the amount of polyethylene wax emulsion is 0 parts, and the rest is the same as Example 1.

[0076] Test Example 1

[0077] This test example tests the performance of the spray-type water-based asphalt waterproof coating prepared in Examples 1-4 and Comparative Example 1. The specific test results are shown in Table 1 below. The performance indicators and test methods in Table 1 refer to the product standard of "Spray-type Water-based Asphalt Anticorrosive Coating".

[0078] The results in Table 1 show that all physical performance indicators meet the requirements of standard specifications.

[0079] Table 1

[0080] performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 <![CDATA[Density, g / cm 3 > Agreed 1.22 1.22 1.22 1.22 1.22 Viscosity, KU Agreed 122 122 122 122 122 Non-volatile matter (Wt), % ≥55％ 58 58 58 58 58 Sagging (wet film), μm ≥400 950 950 950 950 950 Drying time (surface drying), h ≤1 1 1 1 1 1 Salt spray resistance test (600h) No abnormality No abnormality No abnormality No abnormality No abnormality No abnormality

[0081] Test Example 2

[0082] In this test example, a standard viscosity test is performed on the sprayable water-based asphalt paint waterproof coating prepared in Examples 1-4 and Comparative Example 1. The viscosity of the asphalt paint slurry and the dilution is tested respectively using a laboratory NDJ-5S rotational viscometer. The test temperature is 25°C. The specific test method is to test the viscosity of the slurry with a 4# rotor at a speed of 6 rpm; dilute the slurry and water in a ratio of 1:0.15, and test the viscosity of the dilution with a 3# rotor at a speed of 6 rpm. The specific test results are shown in Table 2 below.

[0083] Table 2

[0084] performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Raw viscosity, cps — 45000 44800 44500 45000 44800 Viscosity of diluent, cps — 13400 13500 13500 13400 13400

[0085] Test Example 3

[0086] In this test example, pencil hardness test was performed on the spray-type water-based asphalt waterproof coating prepared in Examples 1-4 and Comparative Example 1. The test method and result analysis were carried out in accordance with GB / T 6739-2022 "Determination of film hardness of paints and varnishes by pencil method". The specific test results are shown in Table 3 below.

[0087] The results in Table 3 show that the pencil hardness level of the paint film increases with the increase of the polyethylene wax emulsion content.

[0088] Table 3

[0089] performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Pencil hardness grade — H 2H 3H 5H B

[0090] Test Example 4

[0091] In this test example, the tensile strength and elongation at break of the spray-applied water-based asphalt waterproof coating prepared in Examples 1-4 and Comparative Example 1 were tested. The test method was carried out in accordance with the provisions of GB / T 16777-2008 "Test Methods for Building Waterproof Coatings" Standard 9. The specific test results are shown in Table 4 below.

[0092] The results in Table 4 show that the tensile strength increases with the increase of the polyethylene wax emulsion content, and the elongation at break decreases with the increase of the polyethylene wax emulsion content.

[0093] Table 4

[0094] performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Tensile strength, MPa — 0.74 0.85 1.27 1.40 0.58 Elongation at break, % — 258 135 76 58 307

[0095] Test Example 5

[0096] In this test example, the adhesion and flexibility of the spray-type water-based asphalt waterproof coating prepared in Examples 1-4 and Comparative Example 1 were tested. The test method refers to the product standard "Spray-type Water-based Asphalt Anti-corrosion Coating". The specific test results are shown in Table 5 below.

[0097] Table 5

[0098] performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Adhesion, Grade ≤2 1 0 0 5 3 Flexibility, mm ≤1 <1 <1 <1 >1 <1

[0099] From the data in Table 1-5, we can see that:

[0100] The adhesion grade generally shows a decreasing trend with the increase of the polyethylene wax emulsion dosage. The lower the adhesion grade, the stronger the adhesion between the paint film and the substrate surface, and the less likely the paint film will fall off from the substrate surface.

[0101] When the content of polyethylene wax emulsion is low, the paint film texture is soft, the strength is low, and the deformation ability is strong. During the paint film adhesion test, the adhesive force between the tape and the paint film surface is greater than the adhesion between the paint film and the substrate surface, and the paint film falls off from the substrate surface with the tape. With the increase of the polyethylene wax emulsion dosage, the paint film hardens, the strength increases, and the anti-deformation ability is enhanced, and it adheres more closely to the substrate surface, and it is not easy to fall off. But when the polyethylene wax emulsion dosage is excessive (12 parts of corresponding embodiments 4), the paint film texture becomes brittle, presents rigidity, lacks flexibility, and creep is poor. During the adhesion test cross-grid experiment, the paint film in the grid has fallen off from the substrate surface.

[0102] The softer the paint film is, the better the creep resistance is, and the less likely it is to crack or break during bending, so it can be bent along a bending rod with a smaller radius of curvature. However, as the amount of polyethylene wax emulsion increases, the paint film becomes more rigid, less flexible, and more brittle. Cracks appear along a 1mm bending rod, and the flexibility does not meet the relevant indicator requirements of the "Spray-type Water-based Asphalt Anticorrosive Coating" product standard.

[0103] Based on the above data, the polyethylene wax emulsion is optimally selected when the dosage is 8 parts (corresponding to Example 3), the mechanical properties meet the actual use requirements, and various physical performance indicators meet the requirements of relevant standards.

[0104] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A sprayable water-based asphalt waterproof coating, characterized in that: The waterproof coating comprises the following components: high T g Acrylic emulsion, polyethylene wax emulsion, filler, emulsified asphalt, defoamer, bactericide, flash rust preventer, diluted cellulose aqueous solution, diluted thickener aqueous solution, and optionally at least one of a multifunctional regulator, a dispersant and a pigment.

2. The sprayable water-based asphalt waterproof coating according to claim 1, wherein: The high T g The glass transition temperature of acrylic emulsion is 15-19°C; The waterproof coating comprises the following components in parts by weight: high T g 70-90 parts of acrylic emulsion, 0.1-20 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted aqueous solution of cellulose, 0.5-6 parts of diluted aqueous solution of thickener, 0-1 parts of multifunctional regulator, 0-1 parts of dispersant and 1-3 parts of pigment.

3. The sprayable water-based asphalt waterproof coating according to claim 2, wherein: The waterproof coating comprises the following components in parts by weight: high T g 70-85 parts of acrylic emulsion, 1-15 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted cellulose aqueous solution, 0.5-6 parts of diluted thickener aqueous solution, 0-1 parts of multifunctional regulator, 0-1 parts of dispersant and 1-3 parts of pigment; Preferably, the waterproof coating comprises the following components in parts by weight: high T g 70-85 parts of acrylic emulsion, 1-15 parts of polyethylene wax emulsion, 30-120 parts of filler, 140-180 parts of emulsified asphalt, 3-6 parts of defoamer, 0.5-1.5 parts of fungicide, 2-10 parts of flash rust inhibitor, 1-20 parts of diluted aqueous solution of cellulose, 0.5-6 parts of diluted aqueous solution of thickener, 0.1-0.8 parts of multifunctional regulator, 0.1-0.8 parts of dispersant and 1-3 parts of pigment.

4. The sprayable water-based asphalt waterproof coating according to any one of claims 1 to 3, wherein: The filler is silicon micropowder and / or wollastonite powder; The emulsified asphalt is anionic emulsified asphalt; The defoamer is an organosilicon defoamer and / or a polyether-modified organosilicon defoamer; The bactericide is at least one of an isothiazolinone derivative, a substituted phenol, and a heterocyclic compound; The flash rust preventer is at least one of a non-ionic organic polymer flash rust preventer, a corrosion inhibitor polymer, and an organic compound activator; The cellulose diluted aqueous solution is prepared by mixing cellulose and water, and the mass ratio of cellulose to water is 1:(6-7); The thickener diluted aqueous solution is prepared by mixing the thickener and water, and the mass ratio of the thickener to water is 1:(1-2); The multifunctional regulator is an amine polymer; The dispersant is a dispersant based on ammonium polyacrylate and / or a fatty alcohol polyoxyethylene ether sulfate dispersant; The pigment is high color carbon black.

5. The sprayable water-based asphalt waterproof coating according to claim 4, wherein: The cellulose is hydroxyethyl cellulose; The thickener is an alkali swelling thickener.

6. The method for preparing the sprayable water-based asphalt waterproof coating according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: S1: The high T g Acrylic emulsion, polyethylene wax emulsion, fungicide, flash rust preventer, filler, emulsified asphalt, defoamer, optional multifunctional regulator, optional dispersant and optional pigment are mixed and stirred to obtain a component mixture; S2: The component mixture is mixed with the diluted cellulose aqueous solution and the diluted thickener aqueous solution to obtain the sprayable water-based asphalt waterproof coating.

7. The method for preparing the sprayable water-based asphalt waterproof coating according to claim 6, wherein: In step S1: (1) High T g Acrylic acid emulsion, polyethylene wax emulsion, fungicide, anti-flash rust agent, optional multifunctional regulator and optional dispersant are mixed and stirred to obtain a first mixture; (2) mixing the first mixture with a filler to obtain a second mixture; (3) mixing the second mixture with emulsified asphalt to obtain a third mixture; (4) The third mixture is mixed and stirred with a defoamer and an optional pigment to obtain the component mixture.

8. The method for preparing the sprayable water-based asphalt waterproof coating according to claim 7, wherein: In the step (1), the stirring speed is 400-500 rpm and the stirring time is 10-15 min; In step (2), the stirring speed is 700-800 rpm and the stirring time is 40-50 min; In the step (3), the stirring speed is 400-500 rpm and the stirring time is 10-15 min; In the step (4), the stirring speed is 300-500 rpm and the stirring time is 20-40 min.

9. The method for preparing the sprayable water-based asphalt waterproof coating according to claim 6, wherein: In step S2, the stirring speed is 800-1200 rpm, and the stirring time is 40-50 min.

10. Use of the sprayable water-based asphalt waterproof coating according to any one of claims 1 to 5 in the spraying construction of buried pipelines.