Asphalt waterproof coating, preparation method and application thereof

Abstract

The application discloses asphalt waterproof coating and a preparation method and application thereof, and the asphalt waterproof coating comprises the following components in parts by mass: 30-40 parts of acrylic emulsion, 0.1-0.5 parts of defoaming agent, 50-60 parts of emulsified asphalt, 0.2-0.7 parts of emulsifier, 3-6 parts of rubber emulsion, 0.2-0.5 parts of PH regulator, 0.1-0.6 parts of thickening agent, 0.05-0.2 parts of thixotropic agent, 0.1-0.4 parts of bactericide, 0.2-0.6 parts of antioxidant, 1-1.5 parts of ultraviolet resistance agent and 1-10 parts of water. The asphalt waterproof coating has excellent stability, better initial construction viscosity, thixotropy and anti-sagging property, so that a thick film with a thickness of 600-1000 microns can be formed through one-time coating, the construction can be carried out on a horizontal plane or a vertical plane, and no sagging phenomenon occurs.

Description

Technical Field

[0001] This invention belongs to the field of coatings, specifically relating to an asphalt waterproof coating, its preparation method, and its application. Background Technology

[0002] Water-based asphalt waterproof coatings on the market have shown excellent performance in many aspects. First, they have good adhesion properties, which are compatible with the adhesion properties of composite asphalt membranes. They can be used for high-requirement vertical wall construction, ensuring that the composite self-adhesive asphalt membrane on the vertical wall is firmly attached and does not fall off, and can maintain good adhesion properties under low temperature conditions. In addition, water-based asphalt waterproof coatings can also solve the compatibility problem when existing waterproof membranes and waterproof coatings are used in combination, providing a more reliable waterproof solution. However, there are still some problems with water-based asphalt waterproof coatings on the market that need to be improved: (1) The coating itself is water-emulsion, with low viscosity and poor thixotropy, which means that the construction of vertical walls requires a thin coating and multiple coats, which increases the construction time and labor costs. (2) The weather resistance of water-based asphalt waterproof coatings on the market is poor, and long-term exposure to the external environment will affect its waterproof effect. Summary of the Invention

[0003] In order to overcome at least one of the technical problems existing in the prior art, one of the objectives of the present invention is to provide an asphalt waterproof coating.

[0004] The second objective of this invention is to provide a method for preparing an asphalt waterproof coating.

[0005] The third objective of this invention is to provide a composite waterproof material.

[0006] The fourth objective of this invention is to provide a method for preparing a composite waterproof material.

[0007] The fifth objective of this invention is to provide an application of asphalt waterproof coating in the field of building decoration.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] The first aspect of the present invention provides an asphalt waterproof coating comprising the following components in parts by weight: 30-40 parts acrylic emulsion, 0.1-0.5 parts defoamer, 50-60 parts emulsified asphalt, 0.2-0.7 parts emulsifier, 3-6 parts rubber emulsion, 0.2-0.5 parts pH adjuster, 0.1-0.6 parts thickener, 0.05-0.2 parts thixotropic agent, 0.1-0.4 parts bactericide, 0.2-0.6 parts antioxidant, 1-1.5 parts UV stabilizer, and 1-10 parts water.

[0010] Preferably, the acrylic emulsion has a mass fraction of 32 to 36 parts.

[0011] Preferably, the defoamer is present in an amount of 0.1 to 0.2 parts by weight.

[0012] Preferably, the emulsified asphalt has a mass fraction of 53 to 56 parts.

[0013] Preferably, the emulsifier is present in an amount of 0.4 to 0.6 parts by weight.

[0014] Preferably, the rubber latex has a mass fraction of 4 to 6 parts.

[0015] Preferably, the pH adjuster is present in an amount of 0.2 to 0.4 parts by mass.

[0016] Preferably, the thickener is present in an amount of 0.1 to 0.3 parts by weight.

[0017] Preferably, the thixotropic agent is present in an amount of 0.08 to 0.12 parts by mass.

[0018] Preferably, the bactericide is present in a concentration of 0.2 to 0.4 parts by weight.

[0019] Preferably, the antioxidant is present in an amount of 0.2 to 0.4 parts by weight.

[0020] Preferably, the amount of the UV stabilizer is 1 to 1.2 parts by weight.

[0021] Preferably, the emulsified asphalt is a slow-cracking emulsified asphalt.

[0022] Preferably, the slow-cracking emulsified asphalt is anionic emulsified asphalt with a solid content of 50-60%, a viscosity of 200-400 mPa·s measured at 25°C, and a pH of 11-12.

[0023] Preferably, the rubber latex is selected from at least one of styrene latex, chloroprene rubber latex, butyl rubber latex, nitrile rubber latex, and styrene-butadiene rubber latex.

[0024] Preferably, the pure acrylic emulsion has a solid content of 54-56%, a viscosity of 200-1800 mPa·s measured at 25°C, and a pH of 6.5-8.5.

[0025] Preferably, the defoamer is selected from at least one of silicone defoamers, polyether defoamers, polyoxyethylene defoamers, fatty alcohol defoamers, fatty acid ester defoamers, and polyoxyethylene ether defoamers.

[0026] Preferably, the emulsifier is selected from at least one of ammonium fluoride, sodium sulfate, trisodium phosphate, ammonium phosphate di-n-butane ether, polypeptide, alkylphenol polyoxyethylene ether, polyethoxylated fatty alcohol, and SL-AM591. Polyethoxylated fatty alcohol, also known as CEE99, was purchased from Shanghai Zhenpin Chemical Co., Ltd.; SL-AM591 is an anionic calcium-resistant slow-setting asphalt emulsifier, purchased from Shanghai Songli New Material Technology Co., Ltd.

[0027] Preferably, the thickener is selected from at least one of esters, polyacrylic acid, cellulose, gelatin, ether, complexed organometallic compounds, alkanolamides, and hydrophobically modified alkali-swelling thickeners; more preferably, the thickener is cellulose; and even more preferably, the thickener is anionic cellulose.

[0028] Preferably, the thixotropic agent is selected from at least one of bentonite, zinc stearate, and fumed silica.

[0029] Preferably, the fungicide is selected from at least one of the following: flumorpholine, dimethomorph, metalaxyl, benzalkonium chloride, diclofenac, ethoxyfen, iprodione, procymidone, silfluzoxystrobin, tebuconazole, tetraflufenicol, triazole, tebuconazole, bifenthrin, oxadiazon, pyraclostrobin, oxadiazon, oxadiazon, fluazinam, pyridaben, cyprodinil, cyclopyridamole, cyprodinil, fluazinam, and pyridaben.

[0030] Preferably, the antioxidant is selected from at least one of phenolic water-based antioxidants, carbonate water-based antioxidants, phosphate ester water-based antioxidants, and silicone oil water-based antioxidants.

[0031] Preferably, the phenolic aqueous antioxidant includes thiobisphenol antioxidants.

[0032] Preferably, the UV-blocking agent is selected from at least one of UV absorbers, hydrogenated azide, light stabilizers, and UV shielding agents; more preferably, the UV-blocking agent is selected from at least one of salicylate UV-blocking agents, benzophenone UV-blocking agents, benzotriazole UV-blocking agents, substituted acrylonitrile UV-blocking agents, and triazine UV-blocking agents.

[0033] Preferably, the salicylate-based UV stabilizer is selected from at least one of phenyl salicylate, p-octylphenyl salicylate, p-tert-butylphenyl salicylate, and bisphenol A bis(salicylate) ester.

[0034] Preferably, the benzophenone-based UV inhibitor is selected from the sodium salts of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxy-5-sulfobenzophenone, 2-hydroxy-4-methoxy-2′-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone trihydrate, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2,2′,4,4′-tetrahydroxybenzophenone, and 2-hydroxy-4-decyloxobenzophenone. At least one of the following: 2,2′-dihydroxy-4-n-octyloxybenzophenone, 2-hydroxy-5-chlorobenzophenone, 2-hydroxy-4-methoxy-4′-chlorobenzophenone, 2-hydroxy-4-methoxy-2′,4′-dichlorobenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-[2′-hydroxy-3′-(methacryloyloxypropoxy)]benzophenone, 2-hydroxy-4-(2′-hydroxy-3′-acryloyloxypropoxy)benzophenone, 1,3-bis(3′-hydroxy-4′-benzoylphenoxy)propanol-2, 2-hydroxy-4-ethoxyphenylheptadecane, Uvinul 490, Permyl B-100, Mark 1535, and Mark LA-51.

[0035] Preferably, the benzotriazole UV stabilizer is selected from at least one of 2-(2′-hydroxy-3′,5′-dihydroxy-tert-butylphenyl)benzotriazole, 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, 2-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-3′,5′-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2′-hydroxy-4′-n-octyloxyphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-dipentylphenyl)benzotriazole, 2-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole, Tinuvin PS, and Mark 446.

[0036] Preferably, the pH adjuster is selected from at least one of sodium hydroxide, potassium hydroxide, and ammonia water.

[0037] Preferably, the asphalt waterproof coating is a waterproof coating for building exterior walls.

[0038] Preferably, the asphalt waterproof coating comprises the following components in parts by weight: 32-36 parts acrylic emulsion, 0.1-0.2 parts defoamer, 53-56 parts slow-cracking emulsified asphalt, 0.4-0.6 parts emulsifier, 4-6 parts rubber emulsion, 0.2-0.4 parts pH adjuster, 0.1-0.3 parts thickener, 0.08-0.12 parts thixotropic agent, 0.2-0.4 parts bactericide, 0.2-0.4 parts antioxidant, 1-1.2 parts UV stabilizer, and 1-5 parts water.

[0039] The second aspect of the present invention provides a method for preparing the asphalt waterproof coating provided in the first aspect of the present invention, comprising the following steps: mixing the components of the asphalt waterproof coating to obtain the coating.

[0040] Preferably, the preparation method specifically involves: first mixing acrylic emulsion with emulsifier, thickener, and thixotropic agent, then sequentially mixing with a portion of defoamer, emulsified asphalt, rubber latex, and pH adjuster, and finally mixing with the remaining defoamer, bactericide, antioxidant, UV stabilizer, and water to obtain the asphalt waterproof coating.

[0041] A third aspect of the present invention provides a composite waterproof material comprising a substrate, an asphalt waterproof coating, and a waterproof membrane, wherein the asphalt waterproof coating is prepared by applying the asphalt waterproof coating provided in the first aspect of the present invention onto the substrate; and the waterproof membrane is laid on the surface of the asphalt waterproof coating.

[0042] A fourth aspect of the present invention provides a method for preparing the composite waterproof material provided in the third aspect of the present invention, comprising the following steps:

[0043] S1: Apply asphalt waterproof coating to the substrate to form an asphalt waterproof coating;

[0044] S2: A waterproof membrane is laid on the asphalt waterproof coating to obtain the composite waterproof material.

[0045] Preferably, the substrate needs to be surface cleaned before use.

[0046] Preferably, the surface cleaning step is performed by blowing.

[0047] Preferably, the coating step is performed by at least one method selected from spraying, roller coating, brush coating, and curtain coating.

[0048] Preferably, the coating is applied 1 to 3 times.

[0049] The construction method of the asphalt waterproof coating in this invention is simple. It can be applied directly by coating. Due to the high thixotropic nature of the asphalt waterproof coating, it can be quickly and evenly applied to a three-dimensional wall surface in 1-2 coats to achieve the designed thickness, saving a significant amount of construction time and labor costs. The asphalt waterproof coating of this invention can form a paint film of approximately 800μm thick in one thick coat, forming a waterproof layer for use as an exposed coating. Alternatively, it can be bonded to existing waterproof membranes to form a composite waterproof material. This solves the problems of existing asphalt waterproof coatings, such as the inability to apply a thick coat in one coat, severe sagging, and inability to be used exposed.

[0050] The fifth aspect of the present invention provides the application of the asphalt waterproof coating provided in the first aspect of the present invention in the field of building decoration.

[0051] The beneficial effects of this invention are as follows: The asphalt waterproof coating of this invention has excellent stability, exhibiting no sedimentation or clumping after 20 days of storage at 40℃; it has good initial construction viscosity, thixotropy, and anti-sagging properties, allowing it to form a thick film of 600-1000 μm with a single application, enabling application on horizontal or vertical planes without sagging; the asphalt waterproof coating also possesses excellent peel strength, tensile strength, elongation at break, low-temperature flexibility, high-temperature resistance, water resistance, and aging resistance, and can be used alone as an external waterproof coating or combined with waterproof membranes as a composite waterproof material; furthermore, the asphalt waterproof coating of this invention also has excellent adhesion properties, with an adhesion strength exceeding 3.5 MPa, ensuring strong adhesion to waterproof membranes or substrates and preventing the paint film or waterproof membrane from peeling off. Detailed Implementation

[0052] The following examples provide a more detailed description of the specific implementation of the present invention, but the implementation and protection of the present invention are not limited thereto. It should be noted that any processes not specifically described below are methods that can be implemented or understood by those skilled in the art by referring to existing technology. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0053] The raw material information used in the embodiments and comparative examples of this invention is as follows:

[0054] The pure acrylic emulsion has a solid content of 54%–56%, a viscosity (25℃) of 200 mPa·s–1800 mPa·s, and a pH of 6.5–8.5. It was purchased from Badifu Industrial Co., Ltd.: Model 7830.

[0055] The slow-cracking emulsified asphalt is a self-made anionic emulsified asphalt with a solid content of 55%, a pH of 11–12, a viscosity (25℃) of 200 mPa·s–400 mPa·s, and a fineness ≤10 μm. The preparation method of the slow-cracking emulsified asphalt is as follows:

[0056] (1) Soap solution preparation: First, add 10 kg of water to a small stirring tank (with high-speed dispersion), then add 2 kg of hydroxypropyl methylcellulose, stir the solution thoroughly until there are no particles, then transfer it to the soap solution tank, and then repeat the above steps; add the remaining water to the soap solution tank, start the stirrer, then open the heat transfer oil pipe valve to raise the temperature to 55℃, then add the emulsifier SL-AM591, and continue to stir at a constant temperature (55℃) for 20-25 minutes. Note that the temperature should not exceed 60℃, otherwise the emulsifier will degrade. The mass ratio of water: emulsifier: hydroxypropyl methylcellulose is 43.45: 2: 0.15.

[0057] (2) Preparation of oil: Pump 70# asphalt into the asphalt tank and heat it to 130-135℃.

[0058] (3) Preparation of emulsified asphalt: Adjust the gap between the colloid mills, control the flow rate of soap solution and asphalt according to the flow meter (the mass ratio of soap solution and asphalt is 45:55), grind through the colloid mill, filter, and cool through the heat exchanger with circulating water to obtain slow-crack emulsified asphalt.

[0059] The emulsifier is OP-10, whose main component is alkylphenol polyoxyethylene ether;

[0060] The rubber latex is a butyl rubber latex;

[0061] The defoamer is an organosilicon defoamer, namely a mixture of polysiloxane and organic groups, purchased from Shanghai Zhenpin Chemical Co., Ltd.

[0062] The pH adjuster is sodium hydroxide;

[0063] The thickener is hydroxypropyl methylcellulose with a weight average molecular weight of 50,000;

[0064] The thixotropic agent is fumed silica;

[0065] The bactericide is flumorpholine;

[0066] The antioxidant is 4,4'-thiobis(6-tert-butyl-3-methylphenol);

[0067] The UV stabilizer is 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0068] Example 1

[0069] This example provides an asphalt waterproof coating, the composition and distribution of which are shown in Table 1.

[0070] Table 1. Formulation of the asphalt waterproofing coating in Example 1

[0071]

[0072]

[0073] The asphalt waterproof coating in this example was prepared using the following method, with the specific steps as follows:

[0074] Add pure acrylic emulsion → start (low speed) scraper mixing → add emulsifier, thickener, and thixotropic agent and mix for 2 minutes → start (high speed) dispersion mixing for 15 minutes → stop (high speed) dispersion mixing → add some defoamer and scraper mixing for 5 minutes → add slow-cracking emulsified asphalt and scraper mixing for 5 minutes → add rubber emulsion and scraper mixing for 5 minutes → add pH adjuster and scraper mixing for 2 minutes → add the remaining defoamer, bactericide, antioxidant, UV stabilizer, and water and scraper mixing for 5 minutes → stop mixing and let stand for 10 minutes to obtain the asphalt waterproof coating in this example.

[0075] In the above preparation method, low speed refers to a stirring speed of 45 r / min; high speed refers to a stirring speed of 1000 r / min.

[0076] Example 2

[0077] This example provides an asphalt waterproof coating, the composition and distribution of which are shown in Table 2.

[0078] Table 2 Formulation of the asphalt waterproofing coating in Example 2

[0079]

[0080]

[0081] The asphalt waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0082] Example 3

[0083] This example provides an asphalt waterproof coating, the composition and distribution of which are shown in Table 3.

[0084] Table 3. Formulation of the asphalt waterproofing coating in Example 3

[0085] raw material Quality Pure acrylic emulsion 36 Defoamer 0.1 Slow-cracking emulsified asphalt 54.5 emulsifier 0.5 rubber latex 4 pH adjuster 0.3 Thickener 0.2 thixotropic agents 0.1 bactericide 0.3 antioxidants 0.3 UV protectant 1 water 2.7

[0086] The asphalt waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0087] Example 4

[0088] This example provides an asphalt waterproof coating, the composition and distribution of which are shown in Table 4.

[0089] Table 4. Formulation of the asphalt waterproofing coating in Example 4

[0090]

[0091]

[0092] The asphalt waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0093] Example 5

[0094] This example provides a method for applying an asphalt waterproof coating. The specific steps are as follows:

[0095] (1) To blow and clean the building under construction;

[0096] (2) Apply or spray the asphalt waterproof coating prepared in Example 1 directly onto the building's flat or vertical base layer in step (1) at room temperature to form an asphalt waterproof layer.

[0097] (3) Lay waterproof membrane on the asphalt waterproof layer to form an asphalt composite waterproof layer, thus completing the construction of the asphalt waterproof coating in Example 1.

[0098] The asphalt waterproof coatings in Examples 1-4 of this invention can form an 800μm thick film in one coat. They can be used alone as an exposed waterproof layer or bonded to existing waterproof membranes to form a composite waterproof layer. This solves the problem that current waterproof coatings cannot be applied thickly and can only be applied in multiple thin coats to achieve the same thickness film as the thick coatings formed in one coat of this invention. In addition, it also solves the problem that existing asphalt waterproof coatings cannot be used alone as an exposed coating.

[0099] Comparative Example 1

[0100] This example provides a waterproof coating, the composition and distribution of which are shown in Table 5.

[0101] Table 5 shows the formulation of the waterproof coating for Comparative Example 1.

[0102]

[0103]

[0104] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0105] Comparative Example 2

[0106] This example provides a waterproof coating, the composition and distribution of which are shown in Table 6.

[0107] Table 6 shows the formulation of the waterproof coating for Comparative Example 2.

[0108] raw material Quality Pure acrylic emulsion 40.5 Defoamer 0.1 Slow-cracking emulsified asphalt 54.5 emulsifier 0.5 rubber latex 0 pH adjuster 0.3 Thickener 0.2 thixotropic agents 0.1 bactericide 0.3 antioxidants 0.3 UV protectant 1 water 2.2

[0109] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0110] Comparative Example 3

[0111] This example provides a waterproof coating, the composition and distribution of which are shown in Table 7.

[0112] Table 7 shows the formulation of the waterproof coating for Comparative Example 3.

[0113]

[0114]

[0115] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0116] Comparative Example 4

[0117] This example provides a waterproof coating, the composition and distribution of which are shown in Table 8.

[0118] Table 8 shows the formulation of the waterproof coating for Comparative Example 4.

[0119] raw material Quality Pure acrylic emulsion 35.5 Defoamer 0.1 Slow-cracking emulsified asphalt 54.5 emulsifier 0.5 rubber latex 5 pH adjuster 0.3 Thickener 0.2 thixotropic agents 0 bactericide 0.3 antioxidants 0.3 UV protectant 1 water 2.3

[0120] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0121] Comparative Example 5

[0122] This example provides a waterproof coating, the composition and distribution of which are shown in Table 9.

[0123] Table 9 shows the formulation of the waterproof coating for Comparative Example 5.

[0124] raw material Quality Pure acrylic emulsion 35.5 Defoamer 0.1 Slow-cracking emulsified asphalt 54.5 emulsifier 0.5 rubber latex 5 pH adjuster 0.3 Thickener 0.2 thixotropic agents 0.1 bactericide 0.3 antioxidants 0 UV protectant 1 water 2.5

[0125] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0126] Comparative Example 6

[0127] This example provides a waterproof coating, the composition and distribution of which are shown in Table 10.

[0128] Table 10 shows the formulation of the waterproof coating for Comparative Example 6.

[0129]

[0130]

[0131] The waterproof coating in this example can be prepared by referring to the preparation method in Example 1.

[0132] Performance testing

[0133] The waterproof coatings prepared in Examples 1-4 and Comparative Examples 1-6 were subjected to various performance tests according to the T / SZWA 006-2021 standard and GB55030-2022 general specifications. The test results of various performances of the waterproof coatings in Examples 1-4 are shown in Table 11, and the test results of various performances of the waterproof coatings in Comparative Examples 1-6 are shown in Table 12.

[0134] Table 11 Performance test results of waterproof coatings in Examples 1-4

[0135]

[0136] Table 12 Performance test results of waterproof coatings in Comparative Examples 1–6

[0137]

[0138] As shown in Tables 11 and 12, compared with Comparative Example 1, replacing the styrene-acrylic acid emulsion with pure acrylic emulsion in Examples 1-4 significantly improved the weather resistance of the waterproof coating; compared with Comparative Example 2, adding rubber emulsion in Examples 1-4 significantly improved the adhesion strength retention rate, peel strength, heat resistance, tensile properties, etc. of the waterproof coating; compared with Comparative Examples 3-4, adding thickener in Examples 1-4 significantly improved the viscosity, anti-settling, and anti-sagging properties of the asphalt waterproof coating; compared with Comparative Examples 5-6, adding antioxidant and UV stabilizer in Examples 1-4 significantly improved the weather resistance of the asphalt waterproof coating. Furthermore, the pure acrylic emulsion and butyl rubber emulsion in the asphalt waterproof coatings of Examples 1-4 synergistically enhanced the high tensile strength and elongation at break of the coating film, while also strengthening the adhesion strength between the coating film and substrates such as concrete; both anionic emulsified asphalt and OP-10 enhanced the adhesion strength with asphalt rolls. Furthermore, the asphalt waterproof coating of this invention has good anti-sagging properties, which allows it to be thickly applied to the wall substrate and solves the problem of wall coating sagging, thereby improving the uniform distribution of the wall waterproof layer and enhancing the reliability of wall waterproofing.

[0139] In summary, the asphalt waterproof coating of this invention exhibits excellent stability, showing no sedimentation or clumping after 20 days of storage at 40℃; it possesses good initial application viscosity and excellent anti-sagging properties, allowing application on both flat and vertical surfaces; it boasts high peel strength, tensile strength, and elongation at break, exhibiting low-temperature flexibility and strong adhesion (reaching over 3.5 MPa). Furthermore, it demonstrates excellent high-temperature resistance, water resistance, and aging resistance. It can be used alone as an external waterproof coating or combined with waterproof membranes as a composite waterproofing material. The asphalt waterproof coating of this invention possesses high tensile strength and elongation at break for a standalone waterproof layer, allowing for independent application to exposed surfaces without a protective layer. It also possesses the adhesive strength of a bonding layer, exhibiting excellent adhesion to existing waterproof membranes. Additionally, it exhibits anti-sagging properties when applied thickly to vertical walls, thus improving application performance.

[0140] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An asphalt waterproof coating, characterized in that: The product comprises the following components in parts by weight: 30-40 parts acrylic emulsion, 0.1-0.5 parts defoamer, 50-60 parts emulsified asphalt, 0.2-0.7 parts emulsifier, 3-6 parts rubber emulsion, 0.2-0.5 parts pH adjuster, 0.1-0.6 parts thickener, 0.05-0.2 parts thixotropic agent, 0.1-0.4 parts bactericide, 0.2-0.6 parts antioxidant, 1-1.5 parts UV stabilizer, and 1-10 parts water. The thixotropic agent is fumed silica, and the thickener is anionic cellulose; The defoamer is an organosilicon defoamer; The coating can form a paint film with a thickness of 600-1000μm through a single application; The emulsified asphalt is a slow-cracking emulsified asphalt; the slow-cracking emulsified asphalt is anionic emulsified asphalt with a solid content of 50-60%, a viscosity of 200-400 mPa·s measured at 25℃, and a pH of 11-12. The rubber latex is a butyl rubber latex.

2. The asphalt waterproof coating according to claim 1, characterized in that: The pure acrylic emulsion has a solid content of 54-56%, a viscosity of 200-1800 mPa·s measured at 25°C, and a pH of 6.5-8.

5.

3. The asphalt waterproof coating according to claim 1, characterized in that: The emulsifier is selected from at least one of ammonium fluoride, sodium sulfate, trisodium phosphate, ammonium phosphate, di-n-butane ether polypeptide, alkylphenol polyoxyethylene ether, polyethoxylated fatty alcohol, and SL-AM591; And / or, the fungicide is selected from at least one of the following: flumorpholine, dimethomorph, metalaxyl, benzalkonium chloride, diclofenac, ethoxyfen, iprodione, procymidone, silfluzoxystrobin, tebuconazole, tetraflufenicol, triazole, tebuconazole, bifenthrin, oxadiazon, pyraclostrobin, oxadiazon, oxadiazon, fluazinam, pyridaben, cyprodinil, cyclopyridamole, cyprodinil, fluazinam, and pyridaben. And / or, the antioxidant is selected from at least one of phenolic waterborne antioxidants, carbonate waterborne antioxidants, phosphate ester waterborne antioxidants, and silicone oil waterborne antioxidants; And / or, the UV absorber is selected from at least one of UV absorbers, hydrogenated azide, light stabilizers, and UV shielding agents.

4. The asphalt waterproof coating according to any one of claims 1 to 3, characterized in that: The asphalt waterproof coating is a waterproof coating for building exterior walls.

5. The method for preparing the asphalt waterproof coating according to any one of claims 1 to 4, characterized in that: Includes the following steps: The asphalt waterproof coating is prepared by mixing its components.

6. A composite waterproof material, characterized in that: The invention comprises a substrate, an asphalt waterproof coating, and a waterproof membrane, wherein the asphalt waterproof coating is prepared by applying the asphalt waterproof coating according to any one of claims 1 to 4 onto the substrate; and the waterproof membrane is laid on the surface of the asphalt waterproof coating.

7. The method for preparing the composite waterproof material according to claim 6, characterized in that: Includes the following steps: S1: Apply the asphalt waterproof coating according to any one of claims 1 to 4 onto the substrate to form an asphalt waterproof coating; S2: A waterproof membrane is laid on the asphalt waterproof coating to obtain the composite waterproof material.

8. The application of the asphalt waterproof coating according to any one of claims 1 to 4 in the field of building decoration.

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