Anti-ultraviolet aging modified asphalt waterproof coating and preparation method thereof

Abstract

The invention relates to the technical field of building materials. The invention discloses an anti-ultraviolet aging modified asphalt waterproof coating and a preparation method thereof. The waterproof coating is prepared from the following raw materials: matrix asphalt, a modifier, an ultraviolet light absorber, filler, a solvent, a plasticizer, a dispersing agent, 3-mercaptopropyl silica gel and nano silicon dioxide intercalated hydrotalcite. The preparation method comprises the following steps: S1, heating matrix asphalt, adding a modifier, and carrying out shear mixing to prepare a premix; s2, adding an ultraviolet light absorber and a filler into the premix, stirring and mixing, adding a solvent, a plasticizer and a dispersant, and stirring and mixing to obtain a mixture; s3, adding 3-mercaptopropyl silica gel and nano silicon dioxide intercalated hydrotalcite into the mixture, stirring and mixing, cooling to room temperature, and sealing and packaging to obtain the ultraviolet aging resistant modified asphalt waterproof coating. The waterproof coating prepared by the invention is excellent in ultraviolet aging resistance.

Description

Technical Field

[0001] The present application relates to the technical field of building materials, and in particular to a modified asphalt waterproof coating resistant to ultraviolet aging and a preparation method thereof. Background Art

[0002] Modified asphalt is a new type of binder that is modified by adding modifiers such as rubber, resin, high molecular polymer or finely ground rubber powder, or by using a mild oxidation process to improve the performance of traditional asphalt. Modified asphalt has good fluidity and coating performance, is easy to construct, and can quickly form a uniform coating to improve work efficiency. These characteristics make waterproof coatings made of modified asphalt an ideal choice for various types of building waterproofing projects, and are widely used in waterproofing treatment of structures such as roofs, basements, tunnels, and bridges.

[0003] Modified asphalt waterproof coatings not only have excellent waterproof effects, but also have multiple functions such as anti-corrosion, moisture-proof, and mildew-proof, while reducing the impact on the environment. They have excellent weather resistance and stability, can effectively resist temperature changes and chemical erosion, and significantly extend the service life of buildings. In addition, the high tensile strength and elasticity of modified asphalt waterproof coatings enable the coating to adapt to slight deformations of the base surface, and even in the presence of fine cracks, it can maintain the integrity and stability of the waterproof layer, providing comprehensive waterproof protection for new and old buildings.

[0004] However, modified asphalt waterproof coatings face severe challenges in areas exposed to direct sunlight, such as roofs and bridge surfaces. Long-term exposure to the combined effects of light, heat, and oxygen can cause the coating to age easily, especially in high-altitude areas where the thin air and stronger ultraviolet radiation accelerate the aging process of the waterproof coating layer and have a significant impact on the waterproof performance. Unlike ordinary aging mechanisms, the aging of modified asphalt is not caused by the volatilization loss of low-molecular oils, but by photo-oxidative aging caused by ultraviolet rays. That is, under the action of ultraviolet rays, the asphalt molecular chains break and react with oxygen, causing the physical and chemical properties of the coating to deteriorate.

[0005] Under the action of light and oxygen aging, the chemical structure and composition of modified asphalt change, causing the material to harden and become brittle, the low-temperature stiffness modulus to increase, and the failure strain to decrease. This makes it easy for modified asphalt waterproof coatings to produce temperature shrinkage cracks in cold weather or environments with large temperature differences, which in turn damages the waterproof effect of waterproof coatings. Under strong ultraviolet radiation, waterproof coatings may even "carbonize", causing the adhesion of the surface asphalt to the aggregate to weaken, accelerating cracking and loosening, and seriously affecting the waterproof performance of the coating.

[0006] Therefore, there is an urgent need to develop a modified asphalt waterproof coating with excellent anti-ultraviolet aging performance to provide a long-lasting and effective waterproof coating for roofs, bridges and other buildings. Summary of the invention

[0007] In order to solve at least one of the above technical problems, a modified asphalt waterproof coating with excellent anti-ultraviolet aging performance is developed. The present application provides a modified asphalt waterproof coating with anti-ultraviolet aging and a preparation method thereof.

[0008] On the one hand, the present application provides a modified asphalt waterproof coating that is resistant to ultraviolet aging. Its raw material composition, measured by weight, includes: 60 to 80 parts of base asphalt, 5 to 15 parts of modifier, 0.5 to 2 parts of ultraviolet absorber, 10 to 20 parts of filler, 10 to 20 parts of solvent, 1 to 5 parts of plasticizer, 1 to 3 parts of dispersant, 1 to 2 parts of 3-mercaptopropyl silica gel, and 2.5 to 5 parts of nano-silica intercalated hydrotalcite.

[0009] By adopting the above technical scheme, the present application adopts specific raw materials and proportions, and the prepared modified asphalt waterproof coating has excellent anti-ultraviolet aging performance and good stability, and can provide long-term and reliable protection for buildings. The present application adds 3-mercaptopropyl silica gel, which can improve the waterproof performance and stability of the modified asphalt waterproof coating, and improve the performance and life of the modified asphalt waterproof coating under ultraviolet irradiation. Nano-silica intercalated hydrotalcite is added, and its high specific surface area and unique layered structure can absorb and shield ultraviolet rays, enhance its anti-ultraviolet aging performance, and also improve the stability of the coating.

[0010] Optionally, the modifier is selected from at least one of SBS, SEBS and rubber powder.

[0011] By adopting the above technical solution, the modifier of the present application can improve the elasticity, crack resistance and durability of the coating and increase the service life of the coating.

[0012] Optionally, the ultraviolet absorber is selected from at least one of ultraviolet absorber UV-O, ultraviolet absorber UV-328 and ultraviolet absorber UV-P.

[0013] By adopting the above technical solution, the UV absorber of the present application has excellent UV absorption capacity and chemical stability, and can effectively protect the coating from damage by UV radiation. It can also remain stable under light, heat and chemical environments, is not easy to decompose, and plays a protective role for a long time.

[0014] Optionally, the filler is selected from at least one of quartz sand, titanium dioxide and calcium carbonate.

[0015] By adopting the above technical solution, the filler of the present application can improve the physical properties of the coating, increase the hardness and wear resistance, and enhance the resistance to ultraviolet aging.

[0016] Optionally, the solvent is selected from at least one of cyclohexanone, xylene and petroleum ether.

[0017] By adopting the above technical solution, the solvent of the present application can effectively dissolve asphalt, modifiers and other coating components to ensure the uniformity and stability of the coating.

[0018] Optionally, the plasticizer is selected from at least one of dioctyl phthalate, dibutyl phthalate and triphenyl phosphate.

[0019] By adopting the above technical scheme, the plasticizer of the present application can improve the flexibility of the coating, reduce its brittle temperature, and enhance its crack resistance under low temperature conditions, so that the waterproof coating can maintain good performance under different climatic conditions.

[0020] Optionally, the dispersant is selected from at least one of polyvinyl butyral, polyvinyl pyrrolidone and sodium polyacrylate.

[0021] By adopting the above technical solution, the dispersant of the present application can ensure that the components in the coating are evenly dispersed, prevent sedimentation and agglomeration, and improve the stability and construction performance of the coating.

[0022] Optionally, the preparation method of the nano-silicon dioxide intercalated hydrotalcite is: Step 1: dispersing nano silicon dioxide in water to prepare nano silicon dioxide suspension; Step 2: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2 to 3:1; Step 3: adding the nano-silicon dioxide suspension to the mixed salt solution, stirring, adding sodium hydroxide solution, stirring, to obtain a mixed solution; Step 4: hydrothermally treat the mixed solution at 100-200° C. for 5-15 hours, centrifuge, wash, and dry to obtain nano-silicon dioxide intercalated hydrotalcite.

[0023] Optionally, the weight ratio of the 3-mercaptopropyl silica gel to the nano-silica intercalated hydrotalcite is 1:2-3.

[0024] By adopting the above technical solution, 3-mercaptopropyl silica gel can enhance the crosslinking density and chemical stability of modified asphalt, thereby improving the durability and chemical resistance of waterproof coatings. Nano-silica intercalated hydrotalcite can further improve stability, and improve the anti-ultraviolet aging performance of coatings through its layered structure to absorb and shield ultraviolet rays. The two work together to effectively improve the anti-ultraviolet aging performance and stability of coatings.

[0025] In a second aspect, the present application provides a method for preparing the above-mentioned modified asphalt waterproof coating resistant to ultraviolet aging, comprising the following steps: S1. heating the base asphalt to 160° C. to 180° C., adding the modifier, and shearing and mixing to obtain a premix; S2, adding the ultraviolet absorber and filler to the premix, stirring and mixing, adding the solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite to the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

[0026] By adopting the above technical solution, the preparation method adopted in this application has a simple process and high production efficiency. The components are fully mixed and have good dispersibility, which further improves the anti-ultraviolet aging performance of the modified asphalt waterproof coating and improves the comprehensive performance of the coating.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application adopts specific raw materials and proportions to produce a modified asphalt waterproof coating with excellent resistance to ultraviolet aging and good stability.

[0028] 2. The present application adds nano-silica intercalated hydrotalcite, whose high specific surface area and unique layered structure can absorb and shield ultraviolet rays, enhance its anti-ultraviolet aging performance, and improve the stability of the coating.

[0029] 3. The preparation method adopted in this application has a simple process and high production efficiency. The components are fully mixed and have good dispersibility, which further improves the anti-ultraviolet aging performance of the modified asphalt waterproof coating. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the embodiments.

[0031] The present application designs a modified asphalt waterproof coating that is resistant to ultraviolet aging. Its raw material composition includes, by weight: 60 to 80 parts of base asphalt, 5 to 15 parts of modifier, 0.5 to 2 parts of ultraviolet absorber, 10 to 20 parts of filler, 10 to 20 parts of solvent, 1 to 5 parts of plasticizer, 1 to 3 parts of dispersant, 1 to 2 parts of 3-mercaptopropyl silica gel, and 2.5 to 5 parts of nano-silica intercalated hydrotalcite.

[0032] The modified asphalt waterproof coating resistant to ultraviolet aging of the present application is prepared by the following method, comprising the following steps: S1. heating the base asphalt to 160° C. to 180° C., adding the modifier, and shearing and mixing to obtain a premix; S2, adding the ultraviolet absorber and filler to the premix, stirring and mixing, adding the solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite to the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

[0033] The applicant has designed the technical solution of the present application in order to solve the problem that the existing modified asphalt waterproof coating is affected by ultraviolet rays, ages, and has poor properties.

[0034] The raw materials used in this application are as follows: SBS:CAS:9003-55-8.

[0035] SEBS: Dongguan Jinshixiang Plastic Raw Materials Co., Ltd., Model: 7551.

[0036] Ultraviolet absorber UV-328: CAS: 21615-49-6.

[0037] Ultraviolet absorber UV-P: CAS: 2440-22-4.

[0038] Quartz sand: CAS: 112945-52-5.

[0039] Titanium dioxide: CAS: 1317-80-2.

[0040] Cyclohexanone: CAS: 108-94-1.

[0041] Xylene: CAS: 1330-20-7.

[0042] Dioctyl phthalate: CAS: 117-84-0.

[0043] Triphenyl phosphate: CAS: 115-86-6.

[0044] Polyvinyl butyral: CAS: 63148-65-2.

[0045] Polyvinylpyrrolidone: CAS: 9003-39-8.

[0046] 3-Mercaptopropyl silica gel: CAS: 438582-69-5.

[0047] Mg(NO3)2·6H2O (magnesium nitrate hexahydrate): CAS: 13446-18-9.

[0048] Al(NO3)3·9H2O (aluminum nitrate nonahydrate): CAS: 7784-27-2. Specific embodiments

[0049] The preparation method of the nano-silicon dioxide intercalated hydrotalcite used in Examples 1 to 3 is as follows: Step 1: dispersing nano-silicon dioxide in water to prepare a nano-silicon dioxide suspension; the average particle size of the nano-silicon dioxide is 15 nm, and the mass fraction is 5 wt%; Step 2: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 3:1; Step 3: adding the nano-silicon dioxide suspension to the mixed salt solution, stirring, adding a sodium hydroxide solution with a mass fraction of 5 wt%, stirring, to obtain a mixed solution; Step 4: hydrothermally treat the mixed solution at 150° C. for 10 h, centrifuge, wash, and dry to obtain nano-silica intercalated hydrotalcite.

[0050] Examples 1 to 3 Example 1 The present embodiment provides a modified asphalt waterproof coating with resistance to ultraviolet aging, and its raw material composition includes, by weight: 80 parts of base asphalt, 5 parts of modifier, 2 parts of ultraviolet absorber, 10 parts of filler, 20 parts of solvent, 1 part of plasticizer, 1 part of dispersant, 1 part of 3-mercaptopropyl silica gel, and 2.5 parts of nano-silica intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 100 1 / 10mm; the modifier is SBS; the ultraviolet absorber is ultraviolet absorber UV-328; the filler is titanium dioxide; the solvent is cyclohexanone; the plasticizer is dioctyl phthalate; and the dispersant is polyvinyl butyral.

[0051] The preparation method comprises the following steps: S1. Heat the base asphalt to 160°C, add the modifier, and shear and mix to obtain a premix; S2, adding ultraviolet absorber and filler to the premix, stirring and mixing, adding solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite into the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

[0052] Example 2 This embodiment provides a modified asphalt waterproof coating that is resistant to ultraviolet aging. The raw material composition includes, by weight: 70 parts of base asphalt, 10 parts of modifier, 1.2 parts of ultraviolet absorber, 15 parts of filler, 15 parts of solvent, 3 parts of plasticizer, 2 parts of dispersant, 1.4 parts of 3-mercaptopropyl silica gel, and 3.5 parts of nano-silica intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 100 1 / 10mm; the modifier is SBS; the ultraviolet absorber is ultraviolet absorber UV-328; the filler is titanium dioxide; the solvent is cyclohexanone; the plasticizer is dioctyl phthalate; and the dispersant is polyvinyl butyral.

[0053] The preparation method comprises the following steps: S1. Heat the base asphalt to 170°C, add the modifier, and shear and mix to obtain a premix; S2, adding ultraviolet absorber and filler to the premix, stirring and mixing, adding solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite into the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

[0054] Example 3 This embodiment provides a modified asphalt waterproof coating that is resistant to ultraviolet aging. The raw material composition includes, by weight: 60 parts of base asphalt, 15 parts of modifier, 0.5 parts of ultraviolet absorber, 20 parts of filler, 10 parts of solvent, 5 parts of plasticizer, 3 parts of dispersant, 2 parts of 3-mercaptopropyl silica gel, and 5 parts of nano-silica intercalated hydrotalcite; Among them, the needle penetration of the base asphalt is 100 1 / 10mm; the modifier is SBS; the ultraviolet absorber is ultraviolet absorber UV-328; the filler is titanium dioxide; the solvent is cyclohexanone; the plasticizer is dioctyl phthalate; and the dispersant is polyvinyl butyral.

[0055] The preparation method comprises the following steps: S1. Heat the base asphalt to 180°C, add the modifier, and shear and mix to obtain a premix; S2, adding ultraviolet absorber and filler to the premix, stirring and mixing, adding solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite into the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

[0056] Comparative Examples 1 to 5 Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, no 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite are added.

[0057] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that no 3-mercaptopropyl silica gel is added in Comparative Example 2.

[0058] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that in Comparative Example 3, no nano-silicon dioxide intercalated hydrotalcite is added.

[0059] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that in Comparative Example 4, the nano-silica intercalated hydrotalcite is replaced with an equal weight of nano-silica, and the average particle size of the nano-silica is 15 nm.

[0060] Comparative Example 5 The difference between Comparative Example 5 and Example 2 is that the preparation method of Comparative Example 5 is: S1. Heat the base asphalt to 170°C, add the modifier, and shear and mix to obtain a premix; S2. Adding ultraviolet absorber, filler, solvent, plasticizer, dispersant, 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite into the premix, stirring and mixing, cooling to room temperature, and sealing and packaging to obtain modified asphalt waterproof coating resistant to ultraviolet aging.

[0061] Experimental testing Test items and test methods Anti-ultraviolet aging performance: According to GB / T 16777-2008 "Test methods for building waterproof coatings", the prepared waterproof coating is subjected to ultraviolet treatment to test its tensile properties and the retention rate of tensile properties.

[0062] Stability: Leave the prepared waterproof coating to stand for 90 days to observe whether stratification occurs.

[0063] Waterproof performance: The waterproof performance of the waterproof coating was tested according to GB / T 16777-2008 "Test methods for building waterproof coatings". The test pressure was 0.2MPa and the duration was 120min.

[0064] The modified asphalt waterproof coatings resistant to ultraviolet aging prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were tested for their anti-ultraviolet aging performance, stability and waterproof performance. The test results are shown in Table 1.

[0065] Table 1 From the test results in Table 1, it can be seen that the modified asphalt waterproof coatings prepared in Examples 1 to 3 have high tensile property retention rate, good resistance to ultraviolet aging, no stratification, impermeability, and good stability and waterproof performance.

[0066] Comparative Example 1 did not add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite, Comparative Example 2 did not add 3-mercaptopropyl silica gel, and Comparative Example 3 did not add nano-silica intercalated hydrotalcite. The anti-ultraviolet aging performance of the modified asphalt waterproof coatings prepared in Comparative Examples 1 to 3 was significantly reduced, stratification and water permeability occurred, and the stability and waterproof performance were reduced.

[0067] In Comparative Example 4, the nano-silica intercalated hydrotalcite was replaced with an equal weight of nano-silica, and the anti-ultraviolet aging performance of the obtained modified asphalt waterproof coating was reduced.

[0068] In step S2 of comparative example 5, the raw materials are mixed and stirred together without being added step by step, and the anti-ultraviolet aging performance of the prepared modified asphalt waterproof coating is reduced.

[0069] Embodiments 4 to 11 Example 4 The difference between Example 4 and Example 2 is that in Example 4, the modifier is SEBS.

[0070] Example 5 The difference between Example 5 and Example 2 is that in Example 5, the ultraviolet absorber is ultraviolet absorber UV-P.

[0071] Example 6 The difference between Example 6 and Example 2 is that in Example 6, the filler is quartz sand.

[0072] Example 7 The difference between Example 7 and Example 2 is that in Example 7, the solvent is xylene.

[0073] Example 8 The difference between Example 8 and Example 2 is that in Example 8, the plasticizer is triphenyl phosphate.

[0074] Example 9 The difference between Example 9 and Example 2 is that in Example 9, the dispersant is polyvinyl pyrrolidone.

[0075] Example 10 The difference between Example 10 and Example 2 is that in Example 10, the total weight of 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite remains unchanged, and the weight ratio of 3-mercaptopropyl silica gel to nano-silica intercalated hydrotalcite is 1:2.

[0076] Embodiment 11 The difference between Example 11 and Example 2 is that in Example 11, the total weight of 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite remains unchanged, and the weight ratio of 3-mercaptopropyl silica gel to nano-silica intercalated hydrotalcite is 1:3.

[0077] The modified asphalt waterproof coatings resistant to ultraviolet aging prepared in Examples 4 to 11 were tested for their anti-ultraviolet aging performance, stability and waterproof performance. The test results are shown in Table 2.

[0078] Table 2 From the test results in Table 2, it can be seen that the anti-ultraviolet aging performance, stability and waterproofness of the modified asphalt waterproof coatings prepared in Examples 4 to 9 are similar to those in Example 2.

[0079] The difference between Example 10 and Example 11 and Example 2 is that the weight ratios of 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite are different. Among them, the modified asphalt waterproof coating prepared in Example 2 has the best anti-ultraviolet aging performance.

[0080] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A modified asphalt waterproof coating resistant to ultraviolet aging, characterized in that: The raw material composition includes, by weight: 60-80 parts of base asphalt, 5-15 parts of modifier, 0.5-2 parts of ultraviolet absorber, 10-20 parts of filler, 10-20 parts of solvent, 1-5 parts of plasticizer, 1-3 parts of dispersant, 1-2 parts of 3-mercaptopropyl silica gel, and 2.5-5 parts of nano-silica intercalated hydrotalcite.

2. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The modifier is selected from at least one of SBS, SEBS and rubber powder.

3. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The ultraviolet absorber is selected from at least one of ultraviolet absorber UV-O, ultraviolet absorber UV-328 and ultraviolet absorber UV-P.

4. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The filler is selected from at least one of quartz sand, titanium dioxide and calcium carbonate.

5. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The solvent is selected from at least one of cyclohexanone, xylene and petroleum ether.

6. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The plasticizer is selected from at least one of dioctyl phthalate, dibutyl phthalate and triphenyl phosphate.

7. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The dispersant is selected from at least one of polyvinyl butyral, polyvinyl pyrrolidone and sodium polyacrylate.

8. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The preparation method of the nano-silicon dioxide intercalated hydrotalcite is as follows: Step 1: dispersing nano silicon dioxide in water to prepare nano silicon dioxide suspension; Step 2: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2~3:1; Step 3: adding the nano-silicon dioxide suspension to the mixed salt solution, stirring, adding sodium hydroxide solution, stirring, to obtain a mixed solution; Step 4: hydrothermally treat the mixed solution at 100-200° C. for 5-15 hours, centrifuge, wash, and dry to obtain nano-silica intercalated hydrotalcite.

9. The modified asphalt waterproof coating resistant to ultraviolet aging according to claim 1, characterized in that: The weight ratio of the 3-mercaptopropyl silica gel to the nano-silica intercalated hydrotalcite is 1:2-3.

10. A method for preparing the modified asphalt waterproof coating resistant to ultraviolet aging according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, heating the base asphalt to 160°C-180°C, adding the modifier, shearing and mixing, and preparing a premix; S2, adding the ultraviolet absorber and filler to the premix, stirring and mixing, adding the solvent, plasticizer and dispersant, stirring and mixing, to obtain a mixture; S3. Add 3-mercaptopropyl silica gel and nano-silica intercalated hydrotalcite to the mixture, stir and mix, cool to room temperature, and seal and package to obtain a modified asphalt waterproof coating that is resistant to ultraviolet aging.

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