Asphalt waterproofing roll and preparation method thereof

Abstract

The present invention relates to the field of coiled material technology, and more particularly to an asphalt waterproofing coiled material and a preparation method thereof. The present invention first uses phenyltrimethoxysilane, 1,4-bis(triethoxysilyl)benzene, and vinyltrimethoxysilane as a framework to construct a porous alkenyl organosilicon-coated boron nitride nanosheet, adds the porous alkenyl organosilicon and SBS to asphalt to obtain modified asphalt, and then applies the modified asphalt to the surface of a polyester base, flattens, and cools to obtain a waterproofing coiled material. The porous alkenyl organosilicon-coated boron nitride nanosheet used in the present invention significantly improves the needle penetration, softening point, and ductility of the asphalt, and enhances the tensile properties, heat resistance, and waterproofness of the waterproofing coiled material prepared therefrom, making it suitable for long-term use in complex environments.

Description

Technical Field

[0001] The present invention relates to the technical field of roll materials, and in particular to an asphalt waterproof roll material and a preparation method thereof. Background Art

[0002] Asphalt waterproofing membrane is an important material widely used in building waterproofing projects. Its performance directly affects the waterproofing effect and service life of the building. As a basic building material, asphalt waterproofing membrane needs to have excellent weather resistance, waterproofness and mechanical properties to adapt to complex construction environments and long-term use requirements. However, traditional asphalt waterproofing membranes usually use matrix asphalt as the main raw material. Although matrix asphalt has certain waterproof properties, it is easy to soften and flow at high temperatures and easy to crack at low temperatures. As a result, it is easy to deform or flow in hot seasons and easy to crack in low-temperature environments, seriously affecting its service life and waterproofing effect. Therefore, in order to improve the comprehensive performance of asphalt waterproofing membranes, in recent years, modifying asphalt by adding modifiers has become the main means to improve its performance.

[0003] SBS (styrene-butadiene-styrene block copolymer) modified asphalt is widely used because of its excellent high temperature stability, low temperature crack resistance and flexibility. SBS is a thermoplastic elastomer that can form an interpenetrating network structure in an asphalt matrix, thereby significantly improving the elasticity and toughness of asphalt, making it have a stronger resistance to deformation at high temperatures, and maintaining good flexibility at low temperatures, meeting the needs of building waterproofing projects. However, SBS modified asphalt still has some problems in practical applications, such as the lack of compatibility of SBS with the asphalt matrix, resulting in unstable modification effect. Due to the polarity difference between SBS and the asphalt matrix, it is easy to phase separate in asphalt and cannot form a uniform distribution in the matrix, resulting in the modification effect being difficult to maintain for a long time. In addition, the small molecule organic matter in the asphalt matrix is easy to migrate and volatilize, which not only affects the mechanical properties and viscoelasticity of asphalt, but also accelerates the aging of asphalt, further affecting the long-term performance of modified asphalt. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an asphalt waterproofing membrane and a preparation method thereof, so as to improve the mechanical properties, heat resistance and waterproofness of the asphalt waterproofing membrane.

[0005] Based on the above purpose, the present invention provides an asphalt waterproofing membrane, which is obtained by coating modified asphalt on the surface of a base, flattening it, and naturally cooling it.

[0006] Furthermore, the preparation method of the modified asphalt is as follows:

[0007] (1) adding boron nitride nanosheets to a mixed solution of anhydrous ethanol and deionized water, ultrasonicating for 20-40 minutes, then adding hexadecyltrimethylammonium bromide, stirring for 20-40 minutes, then adding 1,4-bis(triethoxysilyl)benzene, phenyltrimethoxysilane and vinyltrimethoxysilane, heating to 40-50°C, stirring for 10-15 hours, centrifuging, washing with water, washing with alcohol, and drying to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0008] (2) adding the boron nitride nanosheets coated with alkenyl organosilicon and a hydrochloric acid aqueous solution to anhydrous ethanol, ultrasonicating for 20-40 minutes, then refluxing at 95-105° C. for 20-28 hours, centrifuging, washing with alcohol, and drying to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0009] (3) Add asphalt to cyclohexane oil, heat to 185-195°C, stir for 20-40 minutes, then add SBS, continue stirring for 1.5-2.5 hours, then add porous olefin-based organosilicon-coated boron nitride nanosheets and isopropylbenzene hydroperoxide, continue stirring for 0.5-1.5 hours, then add talc powder, continue stirring for 1.5-2.5 hours, and discharge to obtain modified asphalt.

[0010] Preferably, the average thickness of the boron nitride nanosheets in step (1) is 200-400 nm, and the average sheet diameter is 3-5 μm.

[0011] Preferably, in step (1), the weight ratio of boron nitride nanosheets, anhydrous ethanol, deionized water, hexadecyltrimethylammonium bromide, 1,4-bis(triethoxysilyl)benzene, phenyltrimethoxysilane and vinyltrimethoxysilane is 10:700-1100:50-150:0.3-0.8:3-7:51-25:1-3.

[0012] 4. The asphalt waterproofing membrane according to claim 1, characterized in that in step (2), the weight ratio of the boron nitride nanosheets wrapped with alkenyl organosilicon, the hydrochloric acid aqueous solution and the anhydrous ethanol is 10:8-12:150-250.

[0013] Preferably, the concentration of the hydrochloric acid aqueous solution in step (2) is 1.5-2.5 mol / L.

[0014] Preferably, the asphalt in step (3) is 70# asphalt.

[0015] Preferably, the SBS in step (3) is linear SBS.

[0016] Preferably, the cyclohexane oil in step (3) is one of cyclohexane oil 4006 and cyclohexane oil 4010.

[0017] Preferably, in step (3), the weight ratio of asphalt, naphthenic oil, SBS, porous alkenyl organosilicon-coated boron nitride nanosheets, cumene hydroperoxide and talc is 100:20-30:7-9:3-7:0.06-0.1:6-10.

[0018] Furthermore, the present invention also provides a method for preparing an asphalt waterproofing membrane, comprising the following steps: coating modified asphalt on the surface of a polyester base with a thickness of 3-5 mm, flattening, and naturally cooling to obtain the asphalt waterproofing membrane.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides an asphalt waterproofing membrane and a preparation method thereof. By using porous organosilicon with a skeleton constructed of phenyltrimethoxysilane, 1,4-bis(triethoxysilyl)benzene, and vinyltrimethoxysilane to wrap boron nitride nanosheets, the needle penetration, softening point, and ductility of the modified asphalt are significantly improved, giving it good high-temperature stability, low-temperature crack resistance, and room-temperature flexibility. The unique structure of the porous organosilicon can synergistically adsorb small-molecule organic matter in the asphalt matrix, reducing its migration and volatilization, thereby improving the stability and overall performance of the asphalt. The introduction of benzene rings enhances the compatibility of the boron nitride nanosheets with SBS and the asphalt matrix, further improving the softening point and ductility of the modified asphalt, while also improving the tensile properties, heat resistance, and waterproofness of the waterproofing membrane.

[0021] The present invention provides an asphalt waterproofing membrane and its preparation method. 1,4-Bis(triethoxysilyl)benzene modulates the organosilicon pore structure and environment on the surface of boron nitride nanosheets, enabling them to adsorb more small molecules from the asphalt matrix, forming a resilient surface structure and significantly improving the flexibility and durability of the modified asphalt. Vinyltrimethoxysilane introduces alkenyl groups onto the organosilicon surface, forming a cross-linked network with SBS, further enhancing the mechanical properties and thermal stability of the asphalt. The resulting waterproofing membrane exhibits excellent tensile strength, heat resistance, and waterproof properties, meeting the requirements of long-term use in complex environments. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0023] The average thickness of the boron nitride nanosheets in the specific embodiment of the present invention is 320 nm, and the average sheet diameter is 4.2 μm; the asphalt is 70# asphalt; the SBS is linear SBS purchased from Huizhou Li Changrong Rubber Co., Ltd., brand 3537, and the naphthenic oil is naphthenic oil 4006.

[0024] Example 1:

[0025] (1) 10 g of boron nitride nanosheets were added to a mixed solution of 700 g of anhydrous ethanol and 50 g of deionized water, ultrasonicated for 20 min, then 0.3 g of hexadecyltrimethylammonium bromide was added, stirred for 20 min, then 3 g of 1,4-bis(triethoxysilyl)benzene, 15 g of phenyltrimethoxysilane and 1 g of vinyltrimethoxysilane were added, the temperature was raised to 40 °C, stirred for 10 h, centrifuged, washed with water, and washed with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0026] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 8 g of a 1.5-2.5 mol / L hydrochloric acid aqueous solution were added to 150 g of anhydrous ethanol, ultrasonicated for 20 min, then refluxed at 95° C. for 20 h, centrifuged, washed with alcohol, and dried at 55° C. for 20 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0027] (3) 100 g of asphalt was added to 20 g of cyclohexane oil, the temperature was raised to 185 °C, and the mixture was stirred for 20 min. Then, 7 g of SBS was added and the mixture was stirred for 1.5 h. Then, 3 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.06 g of cumene hydroperoxide were added and the mixture was stirred for 0.5 h. Then, 6 g of talc was added and the mixture was stirred for 1.5 h. The mixture was discharged to obtain the modified asphalt.

[0028] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0029] Example 2:

[0030] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 900 g of anhydrous ethanol and 100 g of deionized water, ultrasonicate for 30 min, add 0.5 g of hexadecyltrimethylammonium bromide, stir for 30 min, then add 5 g of 1,4-bis(triethoxysilyl)benzene, 20 g of phenyltrimethoxysilane and 2 g of vinyltrimethoxysilane, heat to 45 ° C, stir for 12 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0031] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 10 g of a 2 mol / L hydrochloric acid aqueous solution were added to 200 g of anhydrous ethanol, ultrasonicated for 30 min, then refluxed at 100 ° C for 24 h, centrifuged, washed with alcohol, and dried at 60 ° C for 24 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0032] (3) 100 g of asphalt was added to 25 g of cyclohexane oil, the temperature was raised to 190 °C, and the mixture was stirred for 30 min. 8 g of SBS was added and the mixture was stirred for 2 h. 5 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.08 g of cumene hydroperoxide were added and the mixture was stirred for 1 h. 8 g of talc was added and the mixture was stirred for 2 h. The mixture was discharged to obtain the modified asphalt.

[0033] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0034] Example 3:

[0035] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 1100 g of anhydrous ethanol and 150 g of deionized water, ultrasonicate for 40 min, then add 0.8 g of hexadecyltrimethylammonium bromide, stir for 40 min, then add 7 g of 1,4-bis(triethoxysilyl)benzene, 25 g of phenyltrimethoxysilane and 3 g of vinyltrimethoxysilane, heat to 50 ° C, stir for 15 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0036] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 12 g of a 2.5 mol / L hydrochloric acid aqueous solution were added to 250 g of anhydrous ethanol, ultrasonicated for 40 min, refluxed at 105° C. for 28 h, centrifuged, washed with alcohol, and dried at 65° C. for 28 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0037] (3) Add 100 g of asphalt to 30 g of cyclohexane oil, heat to 195 °C, stir for 40 min, add 9 g of SBS, continue stirring for 2.5 h, add 7 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.1 g of cumene hydroperoxide, continue stirring for 1.5 h, add 10 g of talc, continue stirring for 2.5 h, and discharge to obtain modified asphalt;

[0038] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0039] Comparative Example 1:

[0040] The difference between Comparative Example 1 and Example 2 is that phenyltrimethoxysilane in step (1) is replaced by tetramethoxysilane;

[0041] The specific steps are as follows:

[0042] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 900 g of anhydrous ethanol and 100 g of deionized water, ultrasonicate for 30 min, then add 0.5 g of hexadecyltrimethylammonium bromide, stir for 30 min, then add 5 g of 1,4-bis(triethoxysilyl)benzene, 20 g of tetramethoxysilane and 2 g of vinyltrimethoxysilane, heat to 45 ° C, stir for 12 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0043] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 10 g of a 2 mol / L hydrochloric acid aqueous solution were added to 200 g of anhydrous ethanol, ultrasonicated for 30 min, then refluxed at 100 ° C for 24 h, centrifuged, washed with alcohol, and dried at 60 ° C for 24 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0044] (3) 100 g of asphalt was added to 25 g of cyclohexane oil, the temperature was raised to 190 °C, and the mixture was stirred for 30 min. 8 g of SBS was added and the mixture was stirred for 2 h. 5 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.08 g of cumene hydroperoxide were added and the mixture was stirred for 1 h. 8 g of talc was added and the mixture was stirred for 2 h. The mixture was discharged to obtain the modified asphalt.

[0045] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0046] Comparative Example 2:

[0047] The difference between Comparative Example 2 and Example 2 is that 1,4-bis(triethoxysilyl)benzene in step (1) is replaced by phenyltrimethoxysilane;

[0048] The specific steps are as follows:

[0049] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 900 g of anhydrous ethanol and 100 g of deionized water, ultrasonicate for 30 min, then add 0.5 g of hexadecyltrimethylammonium bromide, stir for 30 min, then add 25 g of phenyltrimethoxysilane and 2 g of vinyltrimethoxysilane, heat to 45 ° C, stir for 12 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0050] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 10 g of a 2 mol / L hydrochloric acid aqueous solution were added to 200 g of anhydrous ethanol, ultrasonicated for 30 min, then refluxed at 100 ° C for 24 h, centrifuged, washed with alcohol, and dried at 60 ° C for 24 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0051] (3) 100 g of asphalt was added to 25 g of cyclohexane oil, the temperature was raised to 190 °C, and the mixture was stirred for 30 min. 8 g of SBS was added and the mixture was stirred for 2 h. 5 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.08 g of cumene hydroperoxide were added and the mixture was stirred for 1 h. 8 g of talc was added and the mixture was stirred for 2 h. The mixture was discharged to obtain the modified asphalt.

[0052] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0053] Comparative Example 3:

[0054] The difference between Comparative Example 3 and Example 2 is that the vinyltrimethoxysilane in step (1) is replaced by phenyltrimethoxysilane;

[0055] The specific steps are as follows:

[0056] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 900 g of anhydrous ethanol and 100 g of deionized water, ultrasonicate for 30 min, add 0.5 g of hexadecyltrimethylammonium bromide, stir for 30 min, add 5 g of 1,4-bis(triethoxysilyl)benzene and 22 g of phenyltrimethoxysilane, heat to 45 ° C, stir for 12 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0057] (2) 10 g of alkenyl organosilicon-coated boron nitride nanosheets and 10 g of a 2 mol / L hydrochloric acid aqueous solution were added to 200 g of anhydrous ethanol, ultrasonicated for 30 min, then refluxed at 100 ° C for 24 h, centrifuged, washed with alcohol, and dried at 60 ° C for 24 h to obtain porous alkenyl organosilicon-coated boron nitride nanosheets;

[0058] (3) 100 g of asphalt was added to 25 g of cyclohexane oil, the temperature was raised to 190 °C, and the mixture was stirred for 30 min. 8 g of SBS was added and the mixture was stirred for 2 h. 5 g of porous alkenyl organosilicon-coated boron nitride nanosheets and 0.08 g of cumene hydroperoxide were added and the mixture was stirred for 1 h. 8 g of talc was added and the mixture was stirred for 2 h. The mixture was discharged to obtain the modified asphalt.

[0059] (4) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0060] Comparative Example 4:

[0061] The difference between Comparative Example 4 and Example 2 is that the porous alkenyl organosilicon-coated boron nitride nanosheets in step (3) are replaced with alkenyl organosilicon-coated boron nitride nanosheets;

[0062] The specific steps are as follows:

[0063] (1) Add 10 g of boron nitride nanosheets to a mixed solution of 900 g of anhydrous ethanol and 100 g of deionized water, ultrasonicate for 30 min, add 0.5 g of hexadecyltrimethylammonium bromide, stir for 30 min, then add 5 g of 1,4-bis(triethoxysilyl)benzene, 20 g of phenyltrimethoxysilane and 2 g of vinyltrimethoxysilane, heat to 45 ° C, stir for 12 h, centrifuge, wash with water, and wash with alcohol to obtain alkenyl organosilicon-coated boron nitride nanosheets;

[0064] (2) 100 g of asphalt was added to 25 g of cyclohexane oil, the temperature was raised to 190 ° C, and the mixture was stirred for 30 min. Then 8 g of SBS was added and the mixture was stirred for 2 h. Then 5 g of boron nitride nanosheets coated with alkenyl organosilicon and 0.08 g of cumene hydroperoxide were added and the mixture was stirred for 1 h. Then 8 g of talc was added and the mixture was stirred for 2 h. The mixture was discharged to obtain the modified asphalt.

[0065] (3) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0066] Comparative Example 5:

[0067] The difference between Comparative Example 5 and Example 2 is that the porous alkenyl organosilicon-wrapped boron nitride nanosheets in step (3) are replaced with boron nitride nanosheets;

[0068] The specific steps are as follows:

[0069] (1) Add 100 g of asphalt to 25 g of naphthenic oil, heat to 190 ° C, stir for 30 min, then add 8 g of SBS, continue stirring for 2 h, then add 5 g of boron nitride nanosheets and 0.08 g of cumene hydroperoxide, continue stirring for 1 h, then add 8 g of talc, continue stirring for 2 h, and discharge to obtain modified asphalt;

[0070] (2) The modified asphalt is coated on the surface of the polyester base with a thickness of 4 mm, flattened, and naturally cooled to obtain an asphalt waterproof membrane.

[0071] Performance testing:

[0072] Basic performance tests: needle penetration of asphalt prepared according to the test examples and comparative examples in accordance with standard GB / T4509-2010, softening point of asphalt prepared according to the test examples and comparative examples in accordance with standard GB / T4507-2014, ductility of asphalt prepared according to the test examples and comparative examples in accordance with GB / T4508-2010.

[0073] Tensile property test: The tensile properties of the asphalt waterproof membranes prepared in the examples and comparative examples were tested according to standard GB / T328.8.

[0074] Water-impermeability test: The water-impermeability of the asphalt waterproof membranes prepared in the examples and comparative examples was tested according to method B in standard GB / T328.10-2007.

[0075] Heat resistance test: The heat resistance of the asphalt waterproof membranes prepared in the examples and comparative examples was tested according to method A in standard GB / T328.11-2007.

[0076] Table 1 Performance test results

[0077]

[0078] Note: “√” indicates qualified, “×” indicates unqualified.

[0079] Data Analysis:

[0080] From the data of Examples 1-3 in Table 1, it can be seen that the modified asphalt prepared by the present invention has moderate needle penetration, high softening point and large ductility, which indicates that the modified asphalt has good high-temperature stability, low-temperature crack resistance and room-temperature flexibility. The asphalt waterproof membrane prepared using the modified asphalt has a tensile force of 632N / 50mm and an elongation of 39.5%, and has excellent waterproof performance and high-temperature resistance. This shows that the asphalt waterproof membrane prepared by the present invention meets the requirements of high strength, high-temperature resistance, low-temperature cracking resistance and excellent waterproofness, and is suitable for long-term use in complex environments.

[0081] From the data of Example 2 and Comparative Example 1 in Table 1, it can be seen that the porous organosilicon coated with phenyltrimethoxysilane as the main body can effectively improve the needle penetration of the modified asphalt, and further improve the softening point and ductility. This is mainly because the porous organosilicon with phenyltrimethoxysilane as the skeleton can synergistically adsorb small molecular organic matter in the asphalt matrix with SBS, thereby reducing its adverse effects on the asphalt performance, and effectively improve the tensile properties, heat resistance and waterproofness of the asphalt waterproof membrane. This is mainly because the introduction of benzene rings improves the compatibility between the boron nitride nanosheets and SBS and the asphalt matrix.

[0082] From the data of Example 2 and Comparative Example 2 in Table 1, it can be seen that the porous organosilicon-coated boron nitride nanosheets constructed with the participation of 1,4-bis(triethoxysilyl)benzene can effectively improve the softening point and ductility of the modified asphalt. This is mainly because 1,4-bis(triethoxysilyl)benzene effectively regulates the pore structure and environment of the organosilicon-coated boron nitride nanosheets, thereby enabling the adsorption of more organic small molecules in the asphalt matrix to form an elastic surface structure, thereby improving the softening point and ductility of the modified asphalt. In addition, 1,4-bis(triethoxysilyl)benzene further improves the tensile properties and heat resistance of the asphalt waterproofing membrane. This is mainly because the organosilicon-coated boron nitride nanosheets constructed with the participation of 1,4-bis(triethoxysilyl)benzene can form an interpenetrating structure with SBS and macromolecules in the asphalt matrix.

[0083] The data from Example 3 and Comparative Example 3 in Table 1 demonstrate that the porous organosilicon-coated boron nitride nanosheets constructed with vinyltrimethoxysilane effectively increase the softening point and ductility of modified asphalt, and regulate needle penetration. This is primarily due to the formation of alkenyl groups on the organosilicon surface by vinyltrimethoxysilane, which crosslink with SBS to form a network structure. This network structure also further enhances the tensile properties and heat resistance of the asphalt waterproofing membrane.

[0084] From the data of Example 2 and Comparative Examples 4-5 in Table 1, it can be seen that the porous structure of the surface of the boron nitride nanosheets and the organosilicon containing alkenyl groups can effectively improve the basic properties of asphalt, and further improve the tensile properties, heat resistance and waterproof properties of the asphalt waterproof membrane prepared therefrom.

[0085] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. An asphalt waterproofing membrane, characterized in that: The modified asphalt is coated on the surface of the tire base, flattened, and naturally cooled to obtain the modified asphalt; the preparation method of the modified asphalt is as follows: (1) Add boron nitride nanosheets to a mixed solution of anhydrous ethanol and deionized water, ultrasonicate for 20-40 minutes, then add hexadecyltrimethylammonium bromide, stir for 20-40 minutes, then add 1,4-bis(triethoxysilyl)benzene, phenyltrimethoxysilane and vinyltrimethoxysilane, heat to 40-50°C, stir for 10-15 hours, centrifuge, wash with water, wash with alcohol, and dry to obtain alkenyl organosilicon-coated boron nitride nanosheets. (2) Adding the alkenyl organosilicon-coated boron nitride nanosheets and hydrochloric acid aqueous solution into anhydrous ethanol, ultrasonicating for 20-40 minutes, then refluxing at 95-105°C for 20-28 hours, centrifuging, washing with alcohol, and drying to obtain porous alkenyl organosilicon-coated boron nitride nanosheets; (3) Add asphalt to cyclohexane oil, heat to 185-195°C, stir for 20-40 min, then add SBS, continue stirring for 1.5-2.5 h, then add porous alkenyl organosilicon-coated boron nitride nanosheets and cumene hydroperoxide, continue stirring for 0.5-1.5 h, then add talc powder, continue stirring for 1.5-2.5 h, and discharge to obtain modified asphalt; The weight ratio of the boron nitride nanosheets, anhydrous ethanol, deionized water, hexadecyltrimethylammonium bromide, 1,4-bis(triethoxysilyl)benzene, phenyltrimethoxysilane and vinyltrimethoxysilane in (1) is 10:700-1100:50-150:0.3-0.8:3-7:51-25:1-3.

2. The asphalt waterproofing membrane according to claim 1, characterized in that: The average thickness of the boron nitride nanosheets in (1) is 200-400 nm, and the average sheet diameter is 3-5 μm.

3. The asphalt waterproofing membrane according to claim 1, characterized in that: The weight ratio of the boron nitride nanosheets wrapped with alkenyl organosilicon in (2), the hydrochloric acid aqueous solution and the anhydrous ethanol is 10:8-12:150-250.

4. The asphalt waterproofing membrane according to claim 1, characterized in that: The concentration of the hydrochloric acid aqueous solution in (2) is 1.5-2.5 mol / L.

5. The asphalt waterproofing membrane according to claim 1, characterized in that: The asphalt in (3) is 70# asphalt.

6. The asphalt waterproofing membrane according to claim 1, characterized in that: The SBS in (3) is a linear SBS.

7. The asphalt waterproofing membrane according to claim 1, characterized in that: The cyclohexane oil in (3) is one of cyclohexane oil 4006 and cyclohexane oil 4010.

8. The asphalt waterproofing membrane according to claim 1, characterized in that: The weight ratio of asphalt, cyclohexane oil, SBS, porous olefin-based organosilicon-wrapped boron nitride nanosheets, cumene hydroperoxide and talc in (3) is 100:20-30:7-9:3-7:0.06-0.1:6-10.

9. A method for preparing the asphalt waterproofing membrane according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: coating modified asphalt on the surface of a polyester base with a thickness of 3-5 mm, flattening the surface, and naturally cooling the surface to obtain an asphalt waterproofing coiled material.

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