Modified asphalt composition, preparation method, use thereof and modified asphalt waterproofing membrane

Abstract

This application discloses a modified asphalt composition, its preparation method, uses, and modified asphalt waterproofing membrane. The modified asphalt composition is made from the following raw materials in percentage: 100 PHR of first-component asphalt; 60-80 PHR of second-component asphalt; 10-20 PHR of temperature-stable powder; 4-8 PHR of carbon nanotubes; 4-8 PHR of asphalt mastic; and 3-7 PHR of hydrogenated styrene-butadiene block copolymer. The composition uses a mixture of the first and second asphalt components as a carrier, and incorporates high-toughness, deformation-resistant materials such as the temperature-stable powder, carbon nanotubes, asphalt mastic, and hydrogenated styrene-butadiene block copolymer to form a modified asphalt composition composed of a macromolecular compound connected by repeating units. This composition is used to modify polyester tires, filling the voids within the asphalt molecules with the modified asphalt composition, forming a three-dimensional network structure. The asphalt mastic and hydrogenated styrene-butadiene block copolymer optimize the rheological properties of the asphalt, ensuring that the asphalt maintains good deformation resistance.

Description

Technical Field

[0001] The present application belongs to the technical field of building waterproof materials, and in particular relates to a modified asphalt composition, a preparation method thereof, uses thereof, and a modified asphalt waterproof roll. Background Art

[0002] Shrinkage and deformation of waterproofing membranes are a significant issue in waterproofing projects. Currently, to address the potential for shrinkage and ensure that the membrane's usable area meets national standards in various environments, manufacturers often create margins during production, using wider casings and extending the length of the membrane. For example, for a 10-square-meter waterproofing membrane, a polyester casing with a width of 1015 mm is typically used, and the membrane is produced at a length of 1020 cm. However, despite this margin design, these membranes can still experience significant shrinkage when used in extremely low temperatures, damaging the overlaps and causing leakage. This not only poses significant challenges to building waterproofing performance but also forces a re-examination of the limitations of traditional asphalt waterproofing membranes in specific environments. For example, effectively addressing shrinkage and ensuring the robustness of overlaps in extremely low temperatures or severe cold climates has become a major challenge in waterproofing projects. Furthermore, excessive excess material also places a heavy cost burden on manufacturers. Excessive carcass width and extended coil lengths require more raw material input. From carcass material procurement to energy consumption during production, and increased storage and transportation costs, excessive excess material leads to high costs at every stage.

[0003] Regarding the problem of shrinkage and deformation of waterproof rolls, the prior art discloses coating anti-deformation filling layers on both sides of the polyester tire carcass layer, so as to make the waterproof roll have anti-deformation ability by using the anti-deformation filling layers. The prior art also discloses an anti-deformation thermoplastic polyolefin waterproof roll, which is made of nitrile composite rubber particles embedded with graphene oxide by a high-intensity mechanical method. The island structure of the nitrile composite rubber particles makes the roll highly flexible and not easy to deform; the nitrile composite rubber particles are dispersed in a polypropylene matrix and formed into a support structure with graphene through dynamic vulcanization to improve the strength of the roll; the graphene oxide modified with bis(trimethoxysilylethyl)benzene is polymerized with 3-aminopropylmethyldimethoxysilane to form an amino-grouped, hyperbranched polysiloxane structure, which is chemically cross-linked with the plastic layer, improving its anti-deformation effect, and can also replace polyvinyl chloride to absorb ultraviolet rays, and synergistically improve the anti-aging effect with the amino group. The above two methods are relatively complex in structure during the production process, and the latter has a relatively high production cost, too long a heat preservation time, and too high an energy consumption. Summary of the Invention

[0004] The embodiments of the present application provide a modified asphalt composition, a preparation method thereof, a use thereof, and a modified asphalt waterproof roll, which can make the prepared modified asphalt waterproof roll have the effects of anti-deformation, anti-aging, and waterproofing.

[0005] In the first aspect, the present application provides a modified asphalt composition, which is made from the following raw materials with added percentages: first component asphalt, 100PHR; second component asphalt, 60PHR~80PHR; temperature-resistant powder, 10PHR~20PHR; carbon nanotubes, 4PHR~8PHR; asphalt mastic, 4PHR~8PHR; hydrogenated styrene-butadiene block copolymer, 3PHR~7PHR.

[0006] According to the embodiment of the first aspect of the present application, the first component asphalt is asphalt with a needle penetration of 60 to 110, and the second component asphalt is asphalt with a needle penetration of 0 to 40; the unit of needle penetration is 1 / 10 mm.

[0007] According to an embodiment of the first aspect of the present application, the temperature-resistant powder is selected from one or a combination of nano-silicon dioxide, sandstone particles, talcum powder, limestone powder, and fly ash.

[0008] According to an embodiment of the first aspect of the present application, the average particle size of sandstone particles, talcum powder, and limestone powder is 0.0525-0.25 mm.

[0009] According to an embodiment of the first aspect of the present application, the average particle size of the fly ash is 0.1 μm to 100 μm.

[0010] According to an embodiment of the first aspect of the present application, the average particle size of the nano-silicon dioxide is 1 nm to 10 μm.

[0011] According to an embodiment of the first aspect of the present application, the nano-silica is gas-phase nano-silica.

[0012] According to an embodiment of the first aspect of the present application, the average particle size of the fumed nano-silica is 7 nm to 500 nm.

[0013] According to an embodiment of the first aspect of the present application, the carbon nanotubes are multi-walled carbon nanotubes, the average diameter of the carbon nanotubes is 2 nm to 20 nm, and the axial length of the carbon nanotubes is 5 μm to 15 μm.

[0014] According to an embodiment of the first aspect of the present application, the aspect ratio of the carbon nanotubes is 140-7500.

[0015] According to the embodiment of the first aspect of the present application, the bonding strength of asphalt mastic at 20°C is 1.4 kg / cm 2 ~1.6kg / cm 2The frost resistance requirement is to hang at -40℃ for 2 hours without cracking or detaching, and the elongation at 25℃ is 35cm~45cm.

[0016] According to an embodiment of the first aspect of the present application, asphalt mastic is prepared from 8% to 10% of 1 mm coarse aggregate, 25% to 30% of 200 mesh mineral powder, 45% to 60% of asphalt with a needle penetration of 60 to 110, and 2.5% to 3% of a fiber stabilizer; wherein the unit of needle penetration is 1 / 10 mm.

[0017] According to an embodiment of the first aspect of the present application, the hydrogenated styrene-butadiene block copolymer has a linear or star-shaped structure or a combination thereof, the molecular weight of the hydrogenated styrene-butadiene block copolymer is 150,000 to 450,000, and the mass content of the styrene segment in the hydrogenated styrene-butadiene block copolymer is 25% to 35%.

[0018] In the second aspect, the present application provides a method for preparing a modified asphalt composition, comprising: dispersing a first component asphalt and a second component asphalt according to the ratio of the modified asphalt composition, heating the temperature to 120°C to 140°C to melt the first component asphalt and the second component asphalt to obtain an asphalt dispersion raw material; adding asphalt mastic and hydrogenated styrene-butadiene block copolymer to the asphalt dispersion raw material for dispersion, and heating the temperature to 160°C to 180°C for insulation treatment to obtain a polymer asphalt dispersion; adding temperature-resistant powder and carbon nanotubes to the polymer asphalt dispersion, and heating the temperature to 180°C to 190°C to obtain a modified asphalt composition.

[0019] In a third aspect, the present application provides an asphalt waterproofing membrane, comprising: a polyester base, the polyester base being dipped in the above-mentioned modified asphalt composition; and a coating layer, at least arranged on one side of the two opposite surfaces of the polyester base dipped in the modified asphalt composition.

[0020] According to an embodiment of the third aspect of the present application, based on the polyester tire per square meter, the amount of the modified asphalt composition impregnated per square meter of the polyester tire is 0.4 kg to 1.5 kg.

[0021] According to an embodiment of the third aspect of the present application, the polyester tire is a reinforced polyester tire.

[0022] According to an embodiment of the third aspect of the present application, the coating layer is a coating composition composed of the following components in percentage by mass: 70# asphalt, 45% to 55%; softening oil, 12% to 14%; SBS modifier, 5% to 7%; tire rubber powder, 8% to 11%; and filler, 20% to 30%.

[0023] According to an embodiment of the third aspect of the present application, the modified asphalt waterproof membrane further includes an isolation protective layer, which covers the surface of the coating layer on the side away from the polyester base.

[0024] According to an embodiment of the third aspect of the present application, the isolation protective layer is made of transparent PE material.

[0025] According to an embodiment of the third aspect of the present application, the SBS modifier is a styrene-butadiene-styrene block copolymer with a molecular weight of 150,000 to 400,000 and a mass content of styrene segments of 20% to 30%.

[0026] According to an embodiment of the third aspect of the present application, the average particle size of the tire rubber powder is 70 mesh to 120 mesh.

[0027] According to an embodiment of the third aspect of the present application, the filler is selected from stone powder, heavy calcium powder, fly ash or a combination thereof.

[0028] According to an embodiment of the third aspect of the present application, the average particle size of the filler is 180 mesh to 300 mesh.

[0029] In a fourth aspect, the present application provides a method for preparing a modified asphalt waterproof roll, comprising: impregnating a polyester base in a modified asphalt composition that resists shrinkage and deformation at a temperature of 175°C to 185°C to obtain an impregnated polyester base; and coating a coating composition on the impregnated polyester base to obtain a modified asphalt waterproof roll.

[0030] In a fifth aspect, the application provides a use of the above-mentioned modified asphalt composition in the preparation of modified asphalt waterproofing membrane.

[0031] The modified asphalt composition of the present application embodiment uses a mixture of a first component asphalt and a second component asphalt as a carrier, and incorporates temperature-resistant powder, carbon nanotubes, mastic asphalt, and hydrogenated styrene-butadiene block copolymer, all of which have high toughness and deformation resistance. This forms a modified asphalt composition composed of a macromolecular compound connected by repeating units. This is used as a dipping liquid for polyester tires, where the modified asphalt composition fills the tiny gaps within the asphalt molecules, forming a three-dimensional network structure within them. Furthermore, the modified asphalt composition containing the temperature-resistant powder can also fill the gaps between the polyester tires, enhancing the polyester tire's resistance to deformation at high and low temperatures. When the polyester tire carcass is subjected to deforming external forces such as tension or compression, the three-dimensional network structure can effectively disperse the stress, thereby enhancing the polyester tire's resistance to deformation. Furthermore, mastic asphalt and hydrogenated styrene-butadiene block copolymer can optimize the rheological properties of the asphalt, ensuring that the asphalt maintains good deformation resistance under different pressure and temperature conditions. For example, in an environment with large temperature fluctuations, a modified asphalt composition containing hydrogenated styrene-butadiene block copolymer can effectively prevent excessive deformation caused by thermal expansion and contraction of the waterproof membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 Schematic diagram of the process for preparing the modified asphalt composition provided in the examples of the present application.

[0034] Figure 2 It is a structural schematic diagram of the modified asphalt waterproof membrane provided in an embodiment of the present application.

[0035] Explanation of the accompanying symbols: 1. Polyester tire; 2. Polyester fiber; 3. Modified asphalt composition; 4. Coating layer; 5. Isolation protection layer; 6. Carbon nanotube. DETAILED DESCRIPTION

[0036] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0038] During use, waterproof membranes may shrink partially or as a whole, causing the membrane to peel off from the base layer or cracks in the membrane itself. For example, in an environment with large temperature fluctuations, thermal expansion and contraction are obvious, and some types of waterproof membranes shrink because they cannot adapt to such temperature changes. In the process of improving the existing technology, the inventors of this application found that there are two reasons for the shrinkage of waterproof membranes: on the one hand, the characteristics of the waterproof membrane material itself are the key factors. If the waterproof membrane has poor flexibility and low elastic recovery ability, it is easy to shrink and deform. For example, some low-quality asphalt waterproof membranes soften and flow at high temperatures, and then shrink and harden after cooling. On the other hand, the construction process also has a certain impact on the shrinkage and deformation of waterproof membranes. For example, if no expansion space is reserved when the waterproof membrane is laid, or after hot-melt welding, it will cause shrinkage and deformation. This shrinkage and deformation will reduce the waterproof effect of the waterproof membrane, and in severe cases may cause leakage, which will damage the building's waterproof system.

[0039] In order to solve the problems of the prior art, the present invention provides a modified asphalt composition, a preparation method thereof, a use thereof, and a modified asphalt waterproofing membrane. The modified asphalt composition provided in the present invention is first introduced below.

[0040] In a first aspect, the present application provides a modified asphalt composition, which is prepared from the following raw materials with added percentages: first component asphalt, 100PHR; second component asphalt, 60PHR~80PHR; nano-silicon dioxide, 10PHR~20PHR; temperature-resistant powder, 4PHR~8PHR; asphalt mastic, 4PHR~8PHR; hydrogenated styrene-butadiene block copolymer, 3PHR~7PHR.

[0041] The modified asphalt composition of the present invention uses a mixture of a first component asphalt and a second component asphalt as a carrier, and incorporates temperature-resistant powder, carbon nanotubes, mastic asphalt, and hydrogenated styrene-butadiene block copolymer, all of which have high toughness and deformation resistance. This forms a modified asphalt composition composed of a macromolecular compound connected by repeating units. This modified asphalt composition is used as a dipping solution for polyester tires, where it is applied to the modified polyester tires. The modified asphalt composition fills the tiny gaps within the asphalt molecules, forming a three-dimensional network structure within the asphalt. When the polyester tire carcass is subjected to deforming forces such as tension or compression, the three-dimensional network structure effectively disperses stress and enhances the polyester tire's resistance to deformation. Furthermore, the modified asphalt composition containing the temperature-resistant powder can fill gaps between the polyester tires, enhancing the polyester tire's resistance to deformation at both high and low temperatures. Furthermore, mastic asphalt and hydrogenated styrene-butadiene block copolymer can optimize the asphalt's rheological properties, maintaining good deformation resistance under varying pressure and temperature conditions. For example, in an environment with large temperature fluctuations, a modified asphalt composition containing hydrogenated styrene-butadiene block copolymer can effectively prevent excessive deformation caused by thermal expansion and contraction of the waterproof membrane.

[0042] In the modified asphalt composition of the embodiment of the present application, asphalt mastic, hydrogenated styrene-butadiene block copolymer, nano-silica, and carbon nanotubes can effectively improve the problem of easy shrinkage and deformation of the polyester tire under stress. They not only provide the main support force for the modified asphalt waterproof membrane, but also can improve the oil permeability, water impermeability, and weight increase after immersion of the modified asphalt waterproof membrane product from the perspective of the modified polyester tire body, thereby effectively improving the quality and extending the service life of the modified asphalt waterproof membrane product.

[0043] In some embodiments of the present application, the viscosity of the modified asphalt composition is 500 Pa·s to 1000 Pa·s at 60° C. The viscosity of the modified asphalt composition can be measured using a Brookfield viscometer method.

[0044] In some embodiments of the present application, the first component asphalt is asphalt with a needle penetration of 60 to 110, and the second component asphalt is asphalt with a needle penetration of 0 to 40, wherein the unit of needle penetration is 1 / 10 mm.

[0045] For example, the first asphalt component is 70# asphalt, with a penetration of 60-80 1 / 10 mm; the second asphalt component is 30# asphalt, with a penetration of 20-40 1 / 10 mm. The asphalt dispersion material is composed of 70# and 30# asphalt, with 30# asphalt serving as the asphalt blending oil. When using 30# asphalt to prepare a modified asphalt composition, its addition has minimal impact on the deformation resistance of the modified asphalt waterproofing membrane.

[0046] In other embodiments, the first component is 100# asphalt, with a penetration of 90-110 1 / 10 mm; the second component is 10# asphalt, with a penetration of 0-20 1 / 10 mm. The asphalt dispersion feedstock is composed of 100# and 10# asphalts, with 10# asphalt serving as the asphalt blend. It is understood that one or more asphalts from grades 70# to 100# with a penetration of 60-110 1 / 10 mm can also be selected as the first asphalt component, and one or more asphalts from grades 10# to 30# with a penetration of 0-40 1 / 10 mm can be selected as the second asphalt component to prepare the asphalt dispersion feedstock. The lower the asphalt penetration value, the harder the asphalt, the greater its viscosity, and the greater its ability to resist shear deformation. 1 / 10 mm is the unit of penetration.

[0047] In some embodiments of the present application, the temperature-resistant powder is selected from one or a combination of nano-silica, sandstone particles, talc, limestone powder, and fly ash. The temperature-resistant powder in the embodiments of the present application is insensitive to high temperatures and extreme low temperatures, exhibiting minimal deformation at both high and low temperatures. Dispersed in a modified asphalt composition, it effectively fills the gaps between asphalt molecules, resisting deformation of the modified asphalt composition caused by expansion at high temperatures and contraction at extreme low temperatures.

[0048] In some embodiments of the present application, the average particle size of sandstone particles, talc powder, and limestone powder ranges from 0.0525 to 0.25 mm. Using this temperature-resistant powder, which includes sandstone particles, talc powder, and limestone powder, to prepare a modified asphalt composition effectively fills the gaps between asphalt molecules, preventing deformation of the modified asphalt composition due to shrinkage at extremely low temperatures.

[0049] In some embodiments of the present application, the average particle size of fly ash is 0.1 μm to 100 μm. The fly ash particles have a porous honeycomb structure and a large specific surface area (800 to 10,000 cm2 measured by nitrogen adsorption method). 2 / g), which can fully connect with SEBS molecules and asphalt molecules through the porous honeycomb structure, preventing the modified asphalt composition from deforming and shrinking at high or extremely low temperatures, thereby preventing the modified asphalt waterproof membrane from deforming and shrinking.

[0050] In some embodiments of the present application, the average particle size of the nano-silicon dioxide is 1 nm to 10 μm. Alternatively, the average particle size of the nano-silicon dioxide is 1 nm to 5 μm. Exemplarily, the average particle size of the nano-silicon dioxide is 20 nm to 90 nm, 100 nm to 800 nm, or 1 μm to 5 μm. Nano-silicon dioxide has a small size effect and a surface effect.

[0051] In some embodiments of the present application, the average particle size of the nano-silica is 300nm, 450nm, 560nm, 600nm, 700nm, 750nm, 800nm, 1.2μm, 1.5μm, 2.0μm, 2.5μm, 2.8μm, 3.0μm, 3.5μm, 4.0μm, 4.5μm, 6μm, 6.3μm, 7.0μm, 7.5μm, 8μm, 9μm, 9.6μm, or a combination of nano-silica with multiple average particle size values ​​mentioned above.

[0052] In the examples of this application, nanosilica, when added to asphalt, fills the tiny pores within the asphalt, making the asphalt structure denser. This dense structure better resists deformation when subjected to external forces. Furthermore, the extremely low thermal conductivity of nanosilica is utilized to improve asphalt's temperature sensitivity and density, allowing the asphalt to maintain relatively stable performance at different temperatures and reducing shrinkage and deformation caused by temperature fluctuations.

[0053] In some embodiments of the present application, the nano-silica is fumed nano-silica. Fumed nano-silica includes two types: primary particles and aggregates. The average particle size of the primary particles of fumed nano-silica is 7nm to 40nm, and the average particle size of the aggregated fumed nano-silica is about 200nm to 500nm. Fumed nano-silica has a porous property, and its porosity is as high as 80% to 90%. The high porosity enables the fumed nano-silica to allow the macromolecular parts of asphalt molecules and hydrogenated styrene-butadiene block copolymers to be embedded in the pores, or to be entangled on the fumed nano-silica through the pores, thereby enhancing the compatibility and connectivity between the components in the modified asphalt composition, and cooperating with other components to prevent the modified asphalt composition from shrinking and deforming at low temperatures.

[0054] In some embodiments of the present application, the carbon nanotubes are multi-walled carbon nanotubes, with an average diameter of 2 nm to 20 nm and an axial length of 5 μm to 15 μm. For example, the multi-walled carbon nanotubes can be nickel-based carbon nanotubes SCC-9.

[0055] In the embodiments of the present application, carbon nanotubes, also known as buckytubes, are multi-walled carbon nanotubes, which are composed of several to dozens of layers of coaxial circular tubes composed of carbon atoms arranged in a hexagonal pattern. The distance between the layers in the multi-walled carbon nanotubes is fixed, about 0.34nm. Carbon nanotubes with the above diameter and length are dispersed in the modified asphalt composition, so that the modified asphalt composition can form a three-dimensional network structure, effectively supporting the asphalt dispersion raw material made of the first component asphalt and the second component asphalt. Carbon nanotubes, with their unique one-dimensional quantum structure as a modifying material, have both the hardness of diamond and good flexibility, and basically do not deform at high and low temperatures. After being incorporated into asphalt, carbon nanotubes can serve as supporting structural members, playing a role similar to "rebar", forming a three-dimensional network structure within the modified asphalt composition, so that the modified asphalt composition can also return to its original shape after being subjected to pressure. When the modified asphalt composition is subjected to deformation external forces such as tension or compression, the carbon nanotube network can effectively disperse the stress and enhance the deformation resistance of the modified asphalt composition, thereby allowing the waterproof membrane to be repeatedly compressed, greatly extending the service life of the waterproof membrane.

[0056] In some embodiments of the present application, the aspect ratio of the carbon nanotubes is 200 to 7500. The aspect ratio of the carbon nanotubes is the ratio of the axial length of the carbon nanotubes to the length of the paper towel. Carbon nanotubes meeting this aspect ratio can form a suitable three-dimensional network structure with the asphalt molecules and hydrogenated styrene-butadiene block copolymer in the modified asphalt composition. Alternatively, the aspect ratio of the carbon nanotubes is 200, 220, 240, 280, 300, 350, 400, 500, 600, 750, 800, 910, 1000, 1200, 3000, 4000, 4500, 5000, 6000, 6300, 6670, 7000, or 7200. Carbon nanotubes with an aspect ratio of 150 to 5000 are preferred.

[0057] In the embodiments of the present application, the combination of nano-silica and carbon nanotubes has the property of making the modified asphalt composition maintain a relatively stable performance at different temperatures, reducing the shrinkage deformation caused by temperature changes. Among them, the carbon nanotubes and nano-silica are mutually dispersed with the asphalt mastic and hydrogenated styrene-butadiene block copolymer. When the modified asphalt composition is in a high temperature environment, when the molecules of the asphalt mastic and hydrogenated styrene-butadiene block copolymer and the first component asphalt and the second component asphalt are entangled and connected by heat and expand, the carbon nanotubes distributed therebetween utilize the three-dimensional network structure formed with the macromolecules to intertwine and support each other, hindering the deformation of several molecules due to heat, and the nano-silica dispersed in the three-dimensional network structure fills the gaps between the molecules, further hindering the deformation caused by the thermal expansion of several molecules, so that the modified asphalt composition and the modified asphalt waterproof membrane containing it can also have good dimensional stability at high temperatures (80°C). In contrast, when the modified asphalt composition is in an extremely low temperature environment, the asphalt molecules of the first component asphalt and the second component asphalt are physically entangled and connected with the hydrogenated styrene-butadiene block copolymer, so that the modified asphalt composition has good deformation performance and excellent mechanical properties. At the same time, the three-dimensional network structure formed by the carbon nanotubes and macromolecules contained in the modified asphalt composition intertwines and supports each other, hindering the first component asphalt, the second component asphalt, asphalt mastic and hydrogenated styrene-butadiene block polymer from shrinking at low temperatures. The nano-silica dispersed in the three-dimensional network structure further supports the carbon nanotubes to prevent deformation, and hinders the macromolecules from shrinking due to cold, thereby preventing deformation, thereby effectively improving the dimensional stability of the modified asphalt composition and the modified asphalt waterproof membrane containing it at low temperatures.

[0058] In some embodiments of the present application, the average particle size of the primary particles of the fumed nano-silica is 10 nm to 40 nm, and the average particle size of the fumed nano-silica is 100 nm to 500 nm in the form of aggregates. For example, the average particle size of the fumed nano-silica is 120 nm, 150 nm, 160 nm, 180 nm, 200 nm, 240 nm, 270 nm, 300 nm, 350 nm, 400 nm, 420 nm, 450 nm, or 480 nm.

[0059] In the embodiments of the present application, fumed nanosilica with a particle size within this range is porous. When compounded with carbon nanotubes with an average diameter of 2nm to 35nm, at least one of the two axial ends of the carbon nanotubes can extend into the pores of the fumed nanosilica, forming a material with at least one dumbbell-shaped end. While the carbon nanotubes and the molecules of the other components form a three-dimensional network structure, the dumbbell-shaped structures of the fumed nanosilica at both ends of the carbon nanotubes further hinder the deformation of the macromolecules of the other components due to thermal expansion or cold contraction, thus giving the modified asphalt composition good dimensional stability. Fumed nanosilica with a particle size smaller than this range effectively fills the pores of the three-dimensional network structure, hindering the shrinkage and deformation between molecules, thus giving the modified asphalt composition and the modified asphalt waterproofing membrane containing the modified asphalt composition good dimensional stability, thereby adapting to building waterproofing in different temperature environments.

[0060] In some embodiments of the present application, the adhesion of asphalt mastic at 20°C is 1.4 kg / cm 2 ~1.6kg / cm 2 The frost resistance requirement is that there is no cracking or detachment after hanging at -40°C for 2 hours, and the ductility at 25°C is 35cm to 45cm. In the embodiments of the present application, the asphalt mastic meeting the above requirements can enhance the flexibility and resistance to low-temperature shrinkage deformation of the modified asphalt composition.

[0061] In some embodiments of the present application, asphalt mastic is an asphalt mixture composed of asphalt, fiber stabilizer, mineral powder, and a small amount of fine aggregate, filled with asphalt mastic in a discontinuously graded coarse aggregate skeleton. In some embodiments, the asphalt mastic is made from 8%-10% 1mm coarse aggregate, 25%-30% 200-mesh mineral powder, 45%-60% asphalt with a penetration of 60-110, and 2.5%-3% fiber stabilizer; the penetration is measured in tenths of a millimeter. The high content of coarse aggregate creates a skeleton in the mixture with direct surface-to-surface contact and interlocking particles, directly bearing the load. This skeleton is less sensitive to temperature. The high content of mineral powder forms a highly cohesive gel—mast—with the asphalt component, improving the overall mechanical properties of the mixture. These two effects provide the mixture with sufficient vertical and lateral restraint, ensuring minimal or no deformation under extreme low-temperature contraction or high-temperature expansion. When combined with other components in a modified asphalt composition, the bonding between the components can be used to improve the modified asphalt composition's resistance to shrinkage and deformation at extremely low temperatures. It offers excellent air tightness, waterproofness, frost resistance, resistance to cracking and aging, and can be cold-applied at room temperature.

[0062] In the embodiments of this application, the coarse aggregate within the asphalt mastic (SMA) is interlocked to form a stable skeleton structure. The asphalt mortar, composed of asphalt with a penetration of 60 to 110 (in units of 1 / 10 mm), provides excellent adhesion and resistance to external shear forces. Furthermore, the fibers in the fiber stabilizer provide a reinforcing effect. Asphalt mastic exhibits good flexibility at low temperatures, effectively preventing cracks in the coiled material. However, this effect gradually diminishes as the amount of asphalt mastic added increases.

[0063] In some embodiments of the present application, the hydrogenated styrene-butadiene block copolymer has a linear or star-shaped structure or a combination thereof, the molecular weight of the hydrogenated styrene-butadiene block copolymer is 150,000 to 450,000, and the mass content of the styrene segment in the hydrogenated styrene-butadiene block copolymer is 25% to 35%.

[0064] In the embodiments of the present application, hydrogenated styrene-butadiene block polymer (SEBS) is a linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block. Combining the advantages of plastic and rubber, SEBS exhibits excellent weather resistance, heat resistance, compression deformation resistance, and excellent mechanical properties. When SEBS is incorporated into asphalt, the rheological properties of the asphalt can be optimized, maintaining good deformation resistance under varying stress and temperature conditions. In environments with large temperature fluctuations, the modified asphalt composition containing SEBS, after impregnation with a polyester tire, can effectively prevent deformation caused by thermal expansion and contraction in the modified asphalt waterproofing membrane.

[0065] In the embodiments of the present application, the amount of the modified asphalt composition for hydrogenated styrene-butadiene block polymer needs to be strictly controlled. When the amount of hydrogenated styrene-butadiene block copolymer is too little, the modified asphalt composition and the modified asphalt waterproofing membrane cannot have good flexibility. When the amount of hydrogenated styrene-butadiene block copolymer is too much, the viscosity of the modified asphalt composition is large, and it is difficult to penetrate the polyester tire, so that the polyester tire cannot be fully filled by the modified asphalt composition, and it is difficult to obtain a modified asphalt waterproofing membrane that resists shrinkage deformation. In addition, adding too much hydrogenated styrene-butadiene block copolymer will increase the viscosity of the modified asphalt composition, resulting in an increase in the temperature requirement of the modified asphalt composition, and will also consume too much heat energy, increasing manufacturing costs.

[0066] In the examples of this application, mastic asphalt and hydrogenated styrene-butadiene block copolymer work synergistically with other components to play a key role in enhancing the tensile properties of the waterproof membrane. When subjected to external tensile forces, the modified asphalt waterproof membrane exhibits exceptional toughness and strength, resisting breakage and providing reliable waterproofing for buildings.

[0067] In a second aspect, the present application provides a method for preparing a modified asphalt composition, such as Figure 1 As shown, the method includes: dispersing the first component asphalt and the second component asphalt according to the ratio of the modified asphalt composition, heating the temperature to 120°C to 140°C to melt the first component asphalt and the second component asphalt to obtain an asphalt dispersion raw material; adding asphalt mastic and hydrogenated styrene-butadiene block copolymer to the asphalt dispersion raw material for dispersion, and heating the temperature to 160°C to 180°C for insulation treatment to obtain a polymer asphalt dispersion; adding temperature-resistant powder and carbon nanotubes to the polymer asphalt dispersion for dispersion, and heating the temperature to 180°C to 190°C to obtain a modified asphalt composition.

[0068] In the embodiment of the present application, the temperature is gradually increased during the process of first adding asphalt mastic and hydrogenated styrene-butadiene block copolymer and then adding temperature-resistant powder and carbon nanotubes to the asphalt dispersion raw material to ensure sufficient mixing of the components.

[0069] In some embodiments of the present application, 100 PHR of the first asphalt component and 60 PHR to 80 PHR of the second asphalt component can be added to a metal reactor according to the ratio of the modified asphalt composition, and stirring is maintained at 1000 rpm to 1200 rpm. The temperature is raised to 120°C to 140°C to melt the first component asphalt and the second component asphalt, thereby obtaining an asphalt dispersion raw material to serve as a carrier for other components.

[0070] In some embodiments of the present application, 4PHR to 8PHR of mastic asphalt and 3PHR to 7PHR of hydrogenated styrene-butadiene block copolymer are added to the asphalt dispersion raw material for dispersion, and the temperature is raised to 160°C to 180°C and kept warm for 0.5 hour to 1 hour to prepare a polymer asphalt dispersion.

[0071] In the examples of this application, asphalt mastic and hydrogenated styrene-butadiene block copolymer are added to an asphalt dispersion to modify the asphalt dispersion. The hydrogenated styrene-butadiene block copolymer is then allowed to swell and mix with the asphalt mastic and the asphalt dispersion at 160°C to 180°C. Asphalt mastic has a relatively low temperature requirement and is easily soluble, making it a preferred addition for dispersion. The hydrogenated styrene-butadiene block copolymer is then added for swelling and mixing.

[0072] In some embodiments of the present application, 10PHR to 20PHR of temperature-resistant powder and 4PHR to 8PHR of carbon nanotubes are added to the polymer asphalt dispersion for dispersion, and the temperature is raised to 180°C to 190°C, and the rotation speed is maintained at 1000rpm to 1200rpm for shear dispersion for 1 hour to 1.5 hours to obtain a modified asphalt composition that is resistant to shrinkage deformation.

[0073] In an embodiment of the present application, temperature-resistant powder and carbon nanotubes are added to the polymer asphalt dispersion for dispersion, and the temperature is raised to 180°C to 190°C and sheared for a certain period of time. This can increase the anisotropy of the carbon nanotubes in the modified asphalt composition, so that the temperature-resistant powder fills the gaps between the asphalt molecules, and is compounded with the carbon nanotubes and other components to obtain a modified asphalt composition. The anisotropic carbon nanotubes can hinder the deformation of the modified asphalt composition caused by shrinkage at extremely low temperatures from multiple different directions, and can also hinder the deformation of the modified asphalt composition caused by expansion at high temperatures, so that the modified asphalt waterproof membrane prepared from the modified asphalt composition has good stability, that is, good anti-deformation performance.

[0074] In some embodiments of the present application, adding the anti-temperature-suspension powder and carbon nanotubes to the polymer asphalt dispersion for dispersion further comprises: pre-dispersing the anti-temperature-suspension powder and carbon nanotubes. Pre-dispersing the anti-temperature-suspension powder and carbon nanotubes allows for uniform distribution of the carbon nanotubes and the anti-temperature-suspension powder, with both ends of the carbon nanotubes at least partially inserted into the pores of the anti-temperature-suspension powder, forming a dumbbell-shaped structure that fills and supports the gaps between asphalt molecules and the polyester liner, thereby preventing deformation of the polyester liner and waterproof membrane containing the modified asphalt composition in high or extremely low temperature environments.

[0075] In one embodiment, the temperature-resistant powder is nano-silicon dioxide, fly ash, sandstone particles or a combination thereof, preferably fumed nano-silicon dioxide or fly ash.

[0076] The inventors of this application have discovered that the shrinkage and deformation of existing waterproof membranes are often caused by the fact that the polyester base as the main base is prone to shrinkage and deformation at extremely low temperatures. Conventional polyester bases are treated with a mixture of asphalt of different grades as an impregnation coating, and have poor resistance to shrinkage and deformation at extremely low temperatures.

[0077] On the third aspect, the present application provides an asphalt waterproof roll to solve the above-mentioned problem, comprising: a polyester base 1, which is dipped in the above-mentioned modified asphalt composition 3; a coating layer 4, which is at least arranged on one side of the two opposite surfaces of the polyester base dipped in the modified asphalt composition.

[0078] The modified asphalt waterproofing membrane of the present application has made innovations in this regard. Temperature-resistant powder, carbon nanotubes, asphalt mastic and hydrogenated styrene-butadiene block copolymer are added to the mixture formed by the first component asphalt and the second component asphalt for modification and adjustment. By utilizing the synergistic effect of several components, the polyester tire dipped in the modified asphalt composition can achieve the effect of anti-deformation, thereby making the modified asphalt membrane have good anti-shrinkage deformation performance even at extremely low temperatures.

[0079] In some embodiments of the present application, based on the polyester tire per square meter, the amount of the modified asphalt composition to be dipped per square meter of the polyester tire is 0.4 kg to 1.5 kg.

[0080] In some embodiments of the present application, based on a polyester tire with a thickness of 1.5 mm and a weight of 260 g per square meter, the amount of the polyester tire dip-coated modified asphalt composition per square meter is 0.75 kg to 1.2 kg, and preferably the amount of the polyester tire dip-coated modified asphalt composition per square meter of 260 g is 0.9 kg to 1.0 kg.

[0081] In some embodiments of the present application, based on a polyester tire with a thickness of 1.2 mm and a weight of 200 g per square meter, the amount of the modified asphalt composition used for dipping the polyester tire per square meter is 0.5 kg to 0.8 kg.

[0082] In some embodiments of the present application, based on a polyester tire with a thickness of 1.0 mm and a weight of 140 g per square meter, the amount of the modified asphalt composition used for dipping the polyester tire per square meter is 0.4 kg to 0.6 kg.

[0083] Traditional polyester waterproofing membranes lack resistance to shrinkage and deformation. This application, however, pioneers a new method for preparing modified asphalt waterproofing membranes by dipping the polyester base in a modified asphalt composition. This unique modification significantly enhances the polyester base's resistance to shrinkage and deformation. In practical applications, this means modified asphalt waterproofing membranes can better adapt to complex building constructions and environmental changes, reducing the risk of leakage caused by shrinkage and deformation, and providing more reliable waterproofing for buildings.

[0084] In some embodiments of the present application, the polyester tire is a reinforced polyester tire, and the modified asphalt waterproof membrane using the reinforced polyester tire has better resistance to shrinkage and deformation at low temperatures.

[0085] In the embodiments of the present application, the polyester tire, also known as polyester felt, tire base fabric, or polyester fiber, is primarily made from polyester fiber (e.g., polyethylene terephthalate fiber). It is woven through a textile process into a tire structure with a certain thickness, strength, and elasticity, resulting in high strength and good flexibility. The polyester fibers are interwoven to form a stable mesh structure. Optionally, the polyester tire is a composite of polyester felt and fiberglass mesh, forming a composite of polyester felt and fiberglass mesh.

[0086] In some embodiments of the present application, the coating layer comprises a coating composition composed of the following components by weight: 70# asphalt, 45% to 55%; softening oil, 12% to 14%; SBS modifier, 5% to 7%; tire rubber powder, 8% to 11%; and filler, 20% to 30%. The coating layer is part of the modified asphalt waterproofing membrane and improves its heat resistance, low-temperature flexibility, and water-impermeability.

[0087] In the embodiments of the present application, the coating layer, as a part of the modified asphalt waterproof membrane, has the function of improving the heat resistance, low-temperature flexibility and impermeability of the waterproof membrane.

[0088] In the embodiment of the present application, the thickness of the coating layer is 1.2 to 2 times the thickness of the polyester tire.

[0089] In some embodiments of the present application, the softening oil can be selected from one or more of 200#-300# asphalt, mineral oil, synthetic oil, and vegetable oil. At least 200#-300# asphalt purchased from Shandong Jingbo can be selected.

[0090] In the embodiment of the present application, the SBS modifier is a styrene-butadiene-styrene block copolymer with a molecular weight of 150,000 to 400,000 and a styrene segment content of 20% to 30%. The SBS can be at least SBS purchased from Tianjin Lejin LG411.

[0091] In the embodiments of the present application, the filler is selected from stone powder, heavy calcium powder, fly ash or a combination thereof. The average particle size of the filler is 180 mesh to 300 mesh. At least 200 mesh stone powder from Anshan Haicheng Tianli can be used.

[0092] In the embodiment of the present application, the tire rubber powder has an average particle size of 70-120 meshes, and at least Hebei Zongming 80-mesh tire rubber powder can be used.

[0093] In some embodiments of the present application, the modified asphalt waterproof membrane further includes an isolation protective layer 5 , which covers the surface of the coating layer 4 on the side facing away from the polyester base 1 .

[0094] In some embodiments of the present application, the isolation protection layer 5 is made of a transparent low-density polyethylene (PE) or polypropylene (PP) material, or a film made of a composite of these two materials.

[0095] It should be noted that in actual products, the carbon nanotubes 6 are anisotropically distributed in the polyester fibers 2 of the polyester tire 1 . Figure 2 The carbon nanotubes 6 are only distributed in the horizontal direction, which is intended to illustrate the position distribution of some carbon nanotubes 6 and polyester fibers 2 in the polyester tire 1, and is not intended to limit the technical solution of this application. Nano-silica and SEBS should be dispersed in the modified asphalt composition 3 between the polyester fibers 2. To avoid unclear structural diagrams, SEBS is Figure 2 Not shown in the figure.

[0096] In the examples of this application, the modified asphalt waterproofing membrane has improved key properties such as weight gain after immersion, oil permeability resistance, and soluble matter content. Modified with a modified asphalt composition that resists shrinkage and deformation, the membrane's water resistance is significantly enhanced, minimizing weight changes after immersion. Furthermore, the soluble matter content is effectively controlled, meaning the membrane maintains stable performance even in humid environments, extending its service life.

[0097] It should be noted that soluble matter refers to substances in asphalt and SBS that are soluble in trichloroethylene or carbon tetrachloride. The national standard requires a minimum limit on the amount of soluble matter at different thicknesses.

[0098] More importantly, in the modified asphalt waterproofing membrane of the embodiment of the present application, after being modified by a modified asphalt composition that resists shrinkage and deformation, the comprehensive performance of the modified asphalt waterproofing membrane is greatly improved, and the amount of raw materials such as asphalt added in the coating material that forms the coating layer can be appropriately reduced, thereby reducing the production cost of the coating material and improving the efficiency of the modified asphalt waterproofing membrane product, providing a more reliable waterproofing product for construction projects.

[0099] It should be noted that different regions should make corresponding adjustments based on the environment. Conventional impregnation coatings are mixed with pure asphalt, but different types of waterproof membranes have different oil permeability requirements, and the asphalt grades and proportions used will also be different. In the present application, the modified asphalt composition after the asphalt dispersion raw material is added with additives can not only play an anti-deformation effect, but also meet the oil permeability requirements of different types of waterproof membranes. At the same time, the performance of the increase in mass after immersion in water is also greatly improved, so that the waterproof effect and life of the waterproof membrane are improved. The present application breaks the previous solution that waterproof membranes can only be modified and innovated from the coating material, so that the waterproof membrane can achieve performance improvement in both the coating material and the polyester base. The modified asphalt waterproof membrane of this application will play a more important role and create a safer and more comfortable living or working environment for people.

[0100] It should be noted that conventional asphalt waterproofing membranes leak oily substances to the outside at high temperatures. However, the modified asphalt waterproofing membrane of the present application uses a modified asphalt composition to fill the gaps in the polyester tire. The interstices within the asphalt molecules themselves are filled with fine particles of nano-silica. This, combined with the three-dimensional network structure formed by carbon nanotubes and asphalt mastic hydrogenated styrene-butadiene block copolymer, prevents the modified asphalt waterproofing membrane from expanding and deforming at high temperatures. The nano-silica filling the gaps and pores also blocks oily substances from seeping out of the modified asphalt waterproofing membrane, preventing water from penetrating through the modified asphalt waterproofing membrane, thus preventing a significant increase in the weight of the modified asphalt waterproofing membrane after immersion in water.

[0101] In a fourth aspect, the present application provides a method for preparing a modified asphalt waterproof roll, comprising: impregnating a polyester base in a modified asphalt composition that resists shrinkage and deformation at a temperature of 175°C to 185°C to obtain an impregnated polyester base; and coating a coating composition on the impregnated polyester base to obtain a modified asphalt waterproof roll.

[0102] For example, an embodiment of the present application provides a method for preparing a modified asphalt waterproofing membrane, comprising: injecting the above-prepared shrinkage-resistant modified asphalt composition into a dipping tank, controlling the temperature of the shrinkage-resistant modified asphalt composition to 175°C to 185°C, using a 1015mm wide, 260g polyester tire to completely soak through the dipping tank, then extruding it through an extrusion roller, controlling the consumption of polyester tire impregnation material per square meter to 0.9kg to 1kg, applying an SBS II 4.0 product, i.e., a polymer-containing coating composition, to the oil-soaked and extruded polyester tire, covering it with a PE film as an isolation and protective layer, knurling and compacting it with a pressure roller, cooling, trimming, and rolling it. After passing inspection and acceptance, the modified asphalt waterproofing membrane product is obtained. The coating composition is as described above.

[0103] In some embodiments, the production speed of the modified asphalt waterproof membrane is controlled to be 23m / min to 28m / min.

[0104] In a fifth aspect, the embodiments of the present application provide a modified asphalt composition as described above for use in modifying a polyester tire, that is, for use in preparing a modified asphalt waterproofing membrane.

[0105] The technical solution of the present application is further illustrated below through specific examples and comparative examples. The following are the specifications, trade names or models, and available sources of some raw materials used in the examples and comparative examples. Raw material components not mentioned can be purchased from the market:

[0106] Modified asphalt composition

[0107] The first component asphalt, 70# asphalt, has a needle penetration of 60-80; the second component asphalt, 30# asphalt, has a needle penetration of 25-40, and the unit of needle penetration is 1 / 10 mm. Nano-silicon dioxide, average particle size 1nm-100nm. Carbon nanotubes, average diameter 2nm-20nm, model: W-500, purchased from Shanghai Gaibang Industrial Co., Ltd. Asphalt mastic (hereinafter referred to as SMA), brand HY-60, its composition and content meet the requirements of asphalt mastic components, purchased from Beijing Hongya Jianye Building Materials Co., Ltd.; its adhesion at 20°C is 1.5kg / cm 2 The frost resistance requirement is to have no cracking or detachment after hanging at -40°C for 2 hours, and an elongation of 36 cm at 25°C. The hydrogenated styrene-butadiene block copolymer (hereinafter referred to as SEBS) has a molecular weight of 150,000 to 450,000, wherein the mass content of the styrene segment is 25% to 30%.

[0108] Modified asphalt composition and preparation thereof

[0109] Example 1

[0110] This embodiment provides a modified asphalt composition that resists shrinkage deformation, which is prepared from the following raw materials with the following added percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nano-silicon dioxide, 15 PHR; carbon nanotubes, 6 PHR; SMA, 6 PHR; SEBS, 5 PHR.

[0111] The modified asphalt composition resistant to shrinkage deformation is prepared by the following preparation method, comprising the following steps:

[0112] A1. Disperse 70# asphalt as the first component asphalt and 30# as the second component asphalt at 1000 rpm according to the ratio. Heat to 130°C to 140°C and keep warm for 1 hour until the asphalt is completely melted to obtain a dispersed asphalt raw material.

[0113] A2. Adding mastic asphalt and hydrogenated styrene-butadiene block copolymer to the asphalt dispersion raw material for dispersion, heating to 160° C. to 180° C. and then keeping the temperature for 1 hour to obtain a polymer asphalt dispersion;

[0114] A3. Add nano-silica and carbon nanotubes to the polymer asphalt dispersion, raise the temperature to 180° C. to 190° C., and shear and disperse at a speed of 1000 rpm within this temperature range for 1.5 hours to obtain a modified asphalt composition that is resistant to shrinkage deformation.

[0115] Example 2

[0116] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 65 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 6 PHR; and SEBS, 5 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0117] Example 3

[0118] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 4 PHR; and SEBS, 5 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0119] Example 4

[0120] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 8 PHR; and SEBS, 5 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0121] Example 5

[0122] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 6 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0123] Example 6

[0124] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 6 PHR; and SEBS, 7 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0125] Example 7

[0126] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: 100 PHR of first component asphalt; 70 PHR of second component asphalt; 10 PHR of nanosilica; 6 PHR of carbon nanotubes; 6 PHR of SMA; and 5 PHR of SEBS. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0127] Example 8

[0128] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 4 PHR; SMA, 6 PHR; and SEBS, 5 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0129] Example 9

[0130] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 13 PHR; carbon nanotubes, 5 PHR; SMA, 6 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0131] Example 10

[0132] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: 100 PHR of first-component asphalt; 70 PHR of second-component asphalt; 20 PHR of nanosilica; 4 PHR of carbon nanotubes; 6 PHR of SMA; and 3 PHR of SEBS. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0133] Example 11

[0134] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 8 PHR; SMA, 6 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0135] Example 12

[0136] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 16 PHR; carbon nanotubes, 4 PHR; SMA, 6 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0137] Example 13

[0138] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 13 PHR; carbon nanotubes, 4 PHR; SMA, 6 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0139] Example 14

[0140] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 4 PHR; and SEBS, 7 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0141] Example 15

[0142] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 8 PHR; and SEBS, 3 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0143] Example 16

[0144] This example provides a shrinkage-resistant modified asphalt composition, prepared from the following raw materials in the following percentages: first component asphalt, 100 PHR; second component asphalt, 70 PHR; nanosilica, 15 PHR; carbon nanotubes, 6 PHR; SMA, 8 PHR; and SEBS, 7 PHR. The shrinkage-resistant modified asphalt composition is prepared using the same method as in Example 1.

[0145] Comparative Example 1

[0146] This comparative example provides an asphalt blend oil, which differs from Example 1 in that only equal amounts of 70# asphalt and 30# asphalt are added, without any other components of the modified asphalt composition. The asphalt blend oil preparation method comprises: mixing 70# asphalt and 30# asphalt according to a specific ratio, stirring the mixture at 1000 rpm, heating the mixture to 130°C to 140°C, maintaining the temperature for 1 hour until the asphalt is completely melted, and then heating the mixture to 180°C to 190°C to obtain the asphalt blend oil.

[0147] Comparative Example 2

[0148] This comparative example provides a modified asphalt composition, which differs from Example 1 in that only equal amounts of 70# asphalt, 30# asphalt, SEBS, nanosilica, and carbon nanotubes are added, i.e., 6 PHR of SMA is omitted. The preparation method is the same as in Example 1, except that 6 PHR of SMA is omitted.

[0149] Comparative Example 3

[0150] This comparative example provides a modified asphalt composition, which differs from Example 1 in that only equal amounts of 70# asphalt, 30# asphalt, SMA, nanosilica, and carbon nanotubes are added, i.e., 5 PHR of SEBS is omitted. The preparation method is the same as that of Example 1, except that 5 PHR of SEBS is omitted.

[0151] Comparative Example 4

[0152] This comparative example provides a modified asphalt composition, which differs from Example 1 in that only equal amounts of 70# asphalt, 30# asphalt, SMA, and carbon nanotubes are added, i.e., 15 PHR of nano-silica is omitted. The preparation method is the same as Example 1, except that 15 PHR of nano-silica is omitted.

[0153] Comparative Example 5

[0154] This comparative example provides a modified asphalt composition, which differs from Example 1 in that only equal amounts of 70# asphalt, 30# asphalt, SMA, SEBS, and nano-silica are added, i.e., 6 PHR of carbon nanotubes are omitted. The preparation method is the same as Example 1, except that 6 PHR of carbon nanotubes are omitted.

[0155] Coating composition

[0156] The coating composition is an SBS II 4.0 product, and the coating composition is composed of the following components in percentage by mass: 70# asphalt, 50%; softening oil, 13%; SBS modifier, 6%; tire rubber powder, 9%; filler, 22%; among which, softening oil: 200#~300# asphalt, purchased from Shandong Jingbo Petrochemical Co., Ltd.; SBS, LG411, purchased from Tianjin LG Botian Chemical Co., Ltd.; tire rubber powder, 80 mesh, purchased from Hebei Zongming; filler, 200 mesh stone powder, purchased from Anshan Haicheng Tianli.

[0157] Coating layer

[0158] The coating layer is formed by coating the coating composition of the above-mentioned SBS II 4.0 product with a coating thickness of 2.5 mm, and is applied to the modified asphalt waterproof membranes prepared from the modified asphalt compositions or asphalt mixed oils of Examples 1-16 and Comparative Examples 1-5.

[0159] Preparation of modified asphalt waterproof membrane

[0160] The modified asphalt compositions of Examples 1-16 and the asphalt mixtures and modified asphalt compositions of Comparative Examples 1-5 were placed in respective dipping tanks, each controlled at a temperature of 180°C ± 2°C. A 1015mm wide polyester tire (1.5mm thick, 260g per square meter) was completely dipped in the dipping tanks. The modified asphalt compositions of Examples 1-16 and the asphalt mixtures and modified asphalt compositions of Comparative Examples 1-5 were then extruded through squeeze rollers, with the dipping material consumption controlled to be 1kg per square meter. The polymer coating composition of SBS II 4.0 was then applied to the oil-impregnated and extruded polyester tire to a thickness of 2.5mm. The modified asphalt waterproof membrane was then coated with a PE film, knurled and compacted with a roller, cooled, trimmed, and rolled. The membrane was then inspected and inspected for compliance, yielding a qualified modified asphalt waterproof membrane.

[0161] Comparative Example 6

[0162] This comparative example provides a modified asphalt waterproofing membrane prepared using the modified asphalt composition of Example 1. The modified asphalt waterproofing membrane of Comparative Example 6 differs from the modified asphalt waterproofing membrane prepared in Example 1 in that, instead of dipping the polyester base in the modified asphalt composition of Example 1, the modified asphalt composition of Example 1 is evenly coated on opposite sides of the polyester base of equal thickness to a thickness of 2.5 mm. Subsequently, a polymer coating composition of SBS II 4.0 is applied to the oil-impregnated and extruded polyester base to a thickness of 2.5 mm. The membrane is then coated with a PE film, rolled and compacted, cooled, trimmed, and rolled. After passing inspection and acceptance, the modified asphalt waterproofing membrane is produced.

[0163] Performance Testing

[0164] The modified asphalt waterproof membranes prepared in Examples 1-16 and Comparative Examples 1-6 were subjected to performance tests, and the width of the membranes after production of the polyester base with a width of 1015 mm was recorded. The waterproof membrane samples prepared in Examples 1-16 and Comparative Examples 1-6 were placed under standard environmental conditions (temperature of 23°C ± 2°C, relative humidity of 50% ± 5%) for 24 hours to reach equilibrium, and then the following items were tested and the results recorded.

[0165] 1. Deformation test

[0166] The deformation test of modified asphalt waterproof membrane adopts the national standard GB / T 328-2007 "Test methods for building waterproof membrane" Part 8 for sample preparation and testing.

[0167] 2. Aging test under high temperature environment

[0168] The aging test of modified asphalt waterproof membrane in high temperature environment is carried out in accordance with the national standard GB 18242-2008 "Elastomer modified asphalt waterproof membrane" 6.13.4.3 dimensional change rate for sample preparation and testing.

[0169] 3. Low temperature shrinkage performance test

[0170] Low temperature shrinkage test methods include:

[0171] 3.1 Sample Preparation: Select representative modified asphalt waterproofing membrane samples, the dimensions of which should comply with relevant standards. As previously described, prior to testing, the modified asphalt waterproofing membrane samples prepared in Examples 1-16 and Comparative Examples 1-6 were placed under standard environmental conditions (temperature 23°C ± 2°C, relative humidity 50% ± 5%) for 24 hours to achieve equilibrium.

[0172] 3.2 Low temperature treatment: Place the test samples prepared in Examples 1-16 and Comparative Examples 1-6 into a low temperature environment test chamber, set the required low temperature to -28°C and -38°C, respectively, and keep the test samples in the above low temperature environment for 48 hours to ensure that the test samples are fully treated at low temperature.

[0173] 3.3 Dimension measurement: Use accurate measuring tools (such as vernier calipers) to measure the width of the waterproof membrane before and after low temperature treatment. When measuring, multiple measurements should be taken at different locations of the test sample and the average value should be taken to improve the accuracy of the measurement.

[0174] 3.4 Calculate shrinkage: Based on the measurement results, calculate the shrinkage of the waterproof membrane in a low temperature environment. The shrinkage calculation formula is:

[0175] Shrinkage = average size of the test sample before low-temperature treatment - average size of the test sample after low-temperature treatment.

[0176] The performance test results of the modified asphalt waterproof membranes of Examples 1-16 and Comparative Examples 1-6 are recorded in Table 1 below:

[0177] Table 1

[0178]

[0179] By comparing the raw material composition and content ratio of the modified asphalt waterproof membranes of Examples 1-16 and Comparative Examples 1-6, as well as the test results of the various properties in Table 1, it can be concluded that:

[0180] The modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 1-16 of the present application all had a dimensional change rate of 0% under a lateral tensile force of approximately 1200N / 50mm, indicating that the modified asphalt waterproofing membranes had good dimensional stability. However, the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Comparative Examples 1-6 had a dimensional change rate of 0.12% to 0.67% under a lateral tensile force of approximately 1100N / 50mm, indicating that the dimensional stability of the modified asphalt waterproofing membranes was relatively poor. Among them, the dimensional change rate of the modified asphalt waterproofing membrane in Comparative Example 1, which only contained an asphalt mixture of 70# asphalt and 30# asphalt, was the largest, reaching 0.67%. This indicates that the waterproofing membranes that did not use the modified asphalt composition of the present application had poor dimensional stability after being subjected to stress. It also indicates that the modified asphalt compositions of the embodiments of the present application can effectively improve the dimensional stability of the waterproofing membranes under stress. The modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Comparative Example 2, which lacked SMA, and Comparative Example 5, which lacked carbon nanotubes, exhibited relatively poor dimensional stability compared to the waterproofing membranes prepared from the modified asphalt compositions of Examples 1-16, with dimensional changes reaching 0.12%. This indicates that both SMA and carbon nanotubes are essential components of the modified asphalt compositions, and the absence of either one can degrade the modified asphalt waterproofing membrane's ability to withstand stress and resist deformation. Furthermore, the waterproofing membranes prepared from the modified asphalt compositions of Comparative Example 3, which lacked SEBS, and Comparative Example 4, which lacked nanosilica, exhibited poorer dimensional stability under a lateral tensile force of approximately 1100 N / 50 mm than the waterproofing membranes prepared from the modified asphalt compositions of Examples 1-16, with dimensional changes reaching 0.20% and 0.16%, respectively. This also indicates that the dimensional stability of the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Comparative Examples 2 and 5 is poorer, indicating that SEBS and nanosilica are also essential components of the modified asphalt compositions and have a relatively significant impact on their stress and deformation resistance. In Comparative Example 6, a modified waterproof asphalt membrane was prepared by coating the modified asphalt composition of Example 1 on both sides of the polyester tire in the thickness direction. The dimensional change rate of the modified asphalt membrane under a transverse tensile force of about 1100 N / 50 mm was as high as 0.59%. The dimensional stability of the modified asphalt membrane was significantly lower than that of the modified asphalt waterproof membrane prepared by dipping the modified asphalt composition of Comparative Examples 2-5 on the polyester tire, and also lower than that of the modified asphalt waterproof membrane prepared by dipping the modified asphalt composition of Examples 1-16 on the polyester tire. This also indicates that dipping the modified asphalt composition into the polyester tire is necessary to effectively improve the modified asphalt waterproof membrane.

[0181] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Example 1 and Example 2, the amount of 30# asphalt used was reduced, but the shrinkage rates of the two at -28°C were 0.79% and 0.59%, respectively, which were significantly lower than the shrinkage rates of 1.29% to 5.38% of the modified asphalt waterproofing membranes of Comparative Examples 1-6 at -28°C, indicating that the width shrinkage performance of the modified asphalt waterproofing membranes at -28°C was relatively small; the shrinkage rates at -38°C were 2.07% and 1.88%, respectively, which were significantly lower than the shrinkage rates of 2.88% to 7.57% of the modified asphalt waterproofing membranes of Comparative Examples 1-6 at -38°C, indicating that the width shrinkage performance of the modified asphalt waterproofing membranes at -38°C was also relatively small. These two shrinkage performances at extremely low temperatures indicate that the addition amount of 30# asphalt has little effect on the deformation resistance of the modified asphalt waterproofing membrane.

[0182] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 3, 1, and 4, with increasing SMA dosage, the shrinkage rates at -28°C were 0.79%, 0.79%, and 0%, respectively, and at -38°C they were 2.48%, 2.08%, and 1.48%, respectively. This indicates that increasing SMA dosage weakens the modified asphalt waterproofing membrane's ability to resist shrinkage deformation at extreme low temperatures. Furthermore, compared to the modified asphalt waterproofing membranes of Comparative Examples 1-6, which had shrinkage rates of 1.29% to 5.38% at -28°C and 2.88% to 7.57% at -38°C, these values ​​are still significantly lower.

[0183] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 5, 1, and 6, the shrinkage rates at -28°C (0%, 0.79%, and 1.09%), and at -38°C (0.39%, 2.08%, and 2.78%), respectively, as the SEBS dosage increases, indicate that the modified asphalt waterproofing membrane's ability to resist shrinkage deformation decreases with increasing SEBS dosage. This is because excessive SEBS addition increases the viscosity of the modified asphalt composition, raising the temperature requirement for the modified asphalt composition to penetrate the polyester base, making it difficult to penetrate the base, and also consuming more heat, increasing costs. However, compared to the modified asphalt waterproofing membranes of Comparative Examples 1-6, the shrinkage rates at -28°C (1.29% to 5.38%) and at -38°C (2.88% to 7.57%) are still significantly lower.

[0184] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 1 and 7, the modified asphalt waterproofing membrane prepared in Example 7, which had a lower amount of nanosilica, exhibited shrinkage rates of 1.19% and 2.48% at -28°C and -38°C, respectively. This represents an increase compared to the 0.79% and 2.08% shrinkage rates of the modified asphalt waterproofing membrane prepared in Example 1 at -28°C and -38°C, respectively. This indicates that a reduced amount of nanosilica leads to a decrease in the membrane's resistance to shrinkage deformation at extremely low temperatures. Therefore, adding nanosilica within a limited range is necessary.

[0185] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 1 and 8, the modified asphalt waterproofing membrane prepared in Example 8, which uses a lower amount of carbon nanotubes, exhibited shrinkage rates of 0.69% and 1.78% at -28°C and -38°C, respectively. This is a smaller decrease than the shrinkage rates of 0.79% and 2.08% at -28°C and -38°C, respectively, of the modified asphalt waterproofing membrane prepared in Example 1. This suggests that a moderate reduction in the amount of nanosilica can enhance the waterproofing membrane's resistance to shrinkage deformation at extreme low temperatures, albeit by a small amount. Therefore, limiting the amount of carbon nanotubes is essential.

[0186] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 1, 9 and 10, the modified asphalt waterproofing membrane prepared from the modified asphalt composition of Example 9 has a reduced amount of SEBS and nano-silica, and its shrinkage rates at -28°C and -38°C are 0.49% and 1.68%, respectively; the modified asphalt waterproofing membrane prepared from the modified asphalt composition of Example 10 has a reduced amount of SEBS and an increased amount of fumed nano-silica, and its shrinkage rates at -28°C and -38°C are 0% and 0%, respectively. %; Compared with the modified asphalt waterproof membrane prepared in Example 1, the shrinkage rates of the modified asphalt waterproof membranes prepared in Examples 9 and 10 at extremely low temperatures are significantly reduced. The modified asphalt waterproof membrane prepared in Example 10 does not shrink or deform at extremely low temperatures of -28°C and -38°C, indicating that on the basis of a suitable amount of carbon nanotubes, an appropriate combination of reducing the amounts of nano-silica and SEBS and increasing the amount of nano-silica can significantly improve the anti-shrinkage and deformation performance of the modified asphalt waterproof membrane at extremely low temperatures of -28°C and -38°C.

[0187] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Example 5 and Example 11, the amount of carbon nanotubes in the modified asphalt waterproofing membrane prepared from Example 11 was increased, and its shrinkage rates at -28°C and -38°C were 0% and 1.28%, respectively. Compared with the modified asphalt waterproofing membrane prepared from Example 5, the anti-shrinkage deformation performance of the modified asphalt waterproofing membrane prepared from Example 11 at -28°C remained unchanged, and only the anti-shrinkage deformation performance at -38°C decreased, indicating that excessive use of carbon nanotubes will also affect the anti-shrinkage deformation performance of the modified asphalt waterproofing membrane.

[0188] Comparing the modified asphalt waterproofing membranes prepared from the modified asphalt compositions of Examples 12 and 13, the amounts of SEBS and carbon nanotubes were reduced, but the amount of nanosilica in the modified asphalt waterproofing membrane prepared in Example 13 was increased compared to Example 12. The shrinkage rates of the modified asphalt waterproofing membrane prepared in Example 12 at -28°C and -38°C were 0% and 0.29%, respectively, while the shrinkage rates of the modified asphalt waterproofing membrane prepared in Example 13 at -28°C and -38°C were 0% and 1.08%, respectively. This indicates that reducing the amounts of nanosilica and SEBS on the basis of reducing the carbon nanotube content will result in the modified asphalt waterproofing membrane's resistance to shrinkage deformation at -28°C remaining unchanged, while its resistance to shrinkage deformation at the extreme low temperature of -38°C is reduced.

[0189] Comparing the modified asphalt waterproof membranes prepared from the modified asphalt compositions of Examples 14 to 16, the amount of SMA in the modified asphalt waterproof membrane prepared in Example 16 is increased compared to the modified asphalt waterproof membrane prepared in Example 14. The shrinkage rates of the modified asphalt waterproof membrane prepared in Example 16 at -28°C and -38°C are 1.49% and 2.87%, respectively, which are increased compared to the shrinkage rates of the modified asphalt waterproof membrane prepared in Example 14 at -28°C and -38°C, which are 0.99% and 2.58%, respectively. This indicates that further increasing the amount of SMA on the basis of a higher amount of SEBS will lead to a decrease in the anti-shrinkage deformation performance of the modified asphalt waterproof membrane at extremely low temperatures of -28°C and -38°C. Compared with the modified asphalt waterproof membrane prepared in Example 16 and its shrinkage rate at -28°C and -38°C, the amount of SEBS in the modified asphalt waterproof membrane prepared in Example 15 is reduced, and the shrinkage rates of the modified asphalt waterproof membrane prepared in Example 15 at -28°C and -38°C are reduced to 0% and 0.98%, respectively, indicating that on the basis of having a higher SMA content, appropriately reducing SEBS can improve the anti-shrinkage deformation performance of the modified asphalt waterproof membrane at extremely low temperatures of -28°C and -38°C.

[0190] Among them, the modified asphalt waterproof membranes prepared from the modified asphalt compositions of Examples 5, 10, 12, and 15 exhibited excellent shrinkage and deformation resistance at extremely low temperatures of -28°C and -38°C. In particular, the modified asphalt waterproof membrane prepared from the modified asphalt composition of Example 10 exhibited the best shrinkage and deformation resistance, with a shrinkage rate of 0% at extremely low temperatures of -28°C and -38°C. The modified asphalt waterproof membrane prepared from Example 12 exhibited the second-best shrinkage resistance.

[0191] This application creatively adds nano-silica, carbon nanotubes, mastic asphalt, and hydrogenated styrene-butadiene block copolymer to the asphalt dispersion raw material to produce a polyester-based impregnation coating, namely a modified asphalt composition. This is then used to prepare modified asphalt waterproofing membranes, significantly improving their dimensional stability. Whether in the scorching heat of summer or the cold of winter, the modified asphalt waterproofing membrane maintains stable dimensions and does not experience significant deformation due to temperature fluctuations, providing reliable waterproofing for buildings. Furthermore, the results are also very significant in terms of deformation resistance and low-temperature shrinkage resistance. The modified asphalt waterproofing membrane has a dimensional deformation rate of 0% under a lateral tensile force of approximately 1200N / 50mm.

[0192] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of this application.

Claims

1. A modified asphalt composition, characterized in that: Made from the following raw materials with the following percentage additions: The first component asphalt, 100PHR, the first component asphalt is selected from asphalt with a needle penetration of 60 to 110; The second component asphalt, 60PHR~80PHR The second component asphalt is selected from asphalt with a needle penetration of 0~40, wherein the unit of needle penetration is 1 / 10 mm; Anti-temperature change powder, 10PHR to 20PHR, wherein the anti-temperature change powder is selected from one or a combination of nano-silicon dioxide, sandstone particles, talcum powder, limestone powder, and fly ash; Carbon nanotubes, 4PHR to 8PHR; Asphalt mastic, 4PHR~8PHR; Hydrogenated styrene-butadiene block copolymer, 3PHR~7PHR.

2. The modified asphalt composition according to claim 1, characterized in that The adhesive strength of the asphalt mastic at 20°C is 1.4 kg / cm 2 ~1.6kg / cm 2 The frost resistance requirement is to hang at -40℃ for 2 hours without cracking or detaching, and the elongation at 25℃ is 35cm~45cm.

3. The modified asphalt composition according to claim 1, characterized in that Meet any one of the following requirements: The average particle size of the sandstone particles, talcum powder and limestone powder is 0.0525 to 0.25 mm; The average particle size of the fly ash is 0.1 μm to 100 μm; The average particle size of the nano-silicon dioxide is 1 nm to 10 μm; The nano-silicon dioxide is gas-phase nano-silicon dioxide; The average particle size of the gas-phase nano-silicon dioxide is 1 nm to 1 μm.

4. The modified asphalt composition according to claim 1, characterized in that Meet any one of the following requirements: The carbon nanotubes are multi-walled carbon nanotubes, the average diameter of the carbon nanotubes is 2 nm to 20 nm, and the axial length of the carbon nanotubes is 5 μm to 15 μm; The aspect ratio of the carbon nanotubes is 140 to 7500; The hydrogenated styrene-butadiene block copolymer has a linear or star-shaped structure or a combination thereof, has a molecular weight of 150,000 to 450,000, and contains 25% to 35% by mass of styrene segments in the hydrogenated styrene-butadiene block copolymer.

5. The modified asphalt composition according to claim 1, characterized in that The asphalt mastic is prepared from 8% to 10% of 1mm coarse aggregate, 25% to 30% of 200-mesh mineral powder, 45% to 60% of asphalt with a needle penetration of 60 to 110, and 2.5% to 3% of a fiber stabilizer; wherein the unit of needle penetration is 1 / 10 mm.

6. The method for preparing the modified asphalt composition according to any one of claims 1 to 5, characterized in that: include: According to the ratio of the modified asphalt composition, the first component asphalt and the second component asphalt are dispersed, and the temperature is raised to 120°C to 140°C to melt the first component asphalt and the second component asphalt to obtain an asphalt dispersion raw material; Adding mastic asphalt and hydrogenated styrene-butadiene block copolymer to the asphalt dispersion raw material for dispersion, and heating to 160°C to 180°C for insulation treatment to obtain polymer asphalt dispersion; Adding temperature-resistant powder and carbon nanotubes into polymer asphalt dispersion to disperse the mixture, and heating the mixture to 180-190° C. to obtain a modified asphalt composition.

7. A modified asphalt waterproof membrane, characterized in that: include: A polyester tire, the polyester tire being dipped in the modified asphalt composition according to any one of claims 1 to 5; The coating layer is provided on at least one surface of the two opposite surfaces of the polyester tire dipped in the modified asphalt composition.

8. The modified asphalt waterproof membrane according to claim 7, characterized in that: Meet at least one of the following requirements: Based on the polyester tire per square meter, the amount of the modified asphalt composition applied to the polyester tire per square meter is 0.4 kg to 1.5 kg; The coating layer is formed by coating a coating composition of the following components by weight: 70# asphalt, 45% to 55%; softening oil, 12% to 14%; SBS modifier, 5% to 7%; tire rubber powder, 8% to 11%; filler, 20% to 30%; The modified asphalt waterproofing membrane further comprises an isolation protection layer, which covers the surface of the modified material layer on the side facing away from the polyester base.

9. The modified asphalt waterproof membrane according to claim 8, characterized in that: Meet at least one of the following requirements: The softening oil is one or more of 200# to 300# asphalt, mineral oil, synthetic oil, and vegetable oil; The SBS modifier is a styrene-butadiene-styrene block copolymer with a molecular weight of 150,000 to 400,000 and a styrene chain content of 20% to 30% by mass; The average particle size of the tire rubber powder is 70 mesh to 120 mesh; The filler is selected from one or more of stone powder, heavy calcium powder and fly ash; The average particle size of the filler is 180 meshes to 300 meshes.

10. Use of the modified asphalt composition according to any one of claims 1 to 5 in the preparation of a modified asphalt waterproofing membrane.

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