A high-temperature resistant modified bitumen waterproof membrane and its preparation method

Abstract

This application belongs to the technical field of waterproof membrane preparation, specifically disclosing a high-temperature resistant modified bitumen waterproof membrane and its preparation method. The high-temperature resistant modified bitumen waterproof membrane includes a base layer, a modified bitumen layer, and a PE film arranged sequentially. The raw material components of the modified bitumen layer, by weight, include the following raw materials: 80-100 parts bitumen, 25-35 parts polyethylene, 18-25 parts styrene-butadiene rubber, 10-15 parts ethylene-vinyl acetate, 10-20 parts attapulgite, 15-25 parts wood vinegar, 10-20 parts bamboo and wood powder, 8-18 parts glass microspheres, 28-35 parts modified graphene, 2-3 parts antioxidant, and 1-2 parts stabilizer. The high-temperature resistant modified bitumen waterproof membrane prepared in this application has good mechanical properties and high-temperature resistance. The various raw material components work together to improve the mechanical properties and high-temperature resistance of the bitumen, enabling the waterproof membrane prepared from modified bitumen to be widely used.

Description

Technical Field

[0001] This application relates to the technical field of waterproof membrane preparation, and in particular to a high-temperature resistant modified bitumen waterproof membrane and its preparation method. Background Technology

[0002] Waterproof membranes are typically made from a mixture of asphalt, rubber, and other additives. They possess superior waterproofing performance and flexibility, and are widely used in waterproofing projects for industrial and civil buildings. They are characterized by convenient construction, short construction period, and stable and uniform thickness and dimensions. They are also easy to manage on-site and easy to handle during construction.

[0003] Waterproof membranes are classified into asphalt waterproof membranes, polymer-modified asphalt waterproof membranes, and synthetic polymer waterproof membranes according to their raw material composition. Among them, asphalt waterproof membranes are widely used due to their advantages such as strong adaptability to the substrate, simple surface treatment for spraying, and good waterproof performance.

[0004] However, in hot weather, the surface of most asphalt waterproof membranes absorbs heat and flows at high temperatures due to the properties of asphalt itself, which seriously affects the service life of the waterproof membrane. Therefore, there is a need to provide a high-temperature resistant modified asphalt waterproof membrane to solve the defect of asphalt waterproof membranes being not resistant to high temperatures. Summary of the Invention

[0005] To address the issue of asphalt waterproof membranes being unsuitable for high temperatures, this application provides a high-temperature resistant modified asphalt waterproof membrane and its preparation method.

[0006] This application provides a high-temperature resistant modified bitumen waterproof membrane, employing the following technical solution:

[0007] A high-temperature resistant modified bitumen waterproof membrane includes a base layer, a modified bitumen layer, and a PE film arranged sequentially. The raw material components of the modified bitumen layer, by weight, include the following raw materials: 80-100 parts bitumen, 25-35 parts polyethylene, 18-25 parts styrene-butadiene rubber, 10-15 parts ethylene-vinyl acetate, 10-20 parts attapulgite, 15-25 parts wood vinegar, 10-20 parts bamboo and wood powder, 8-18 parts glass microspheres, 28-35 parts modified graphene, 2-3 parts antioxidant, and 1-2 parts stabilizer.

[0008] By adopting the above technical solution, the waterproof membrane composed of the base layer, modified asphalt layer, and PE film has good waterproof performance and high temperature resistance. In the raw material components of the modified asphalt layer, other raw materials are added to modify the asphalt, giving the asphalt good waterproof and anti-corrosion properties. Polyethylene has excellent mechanical properties, high wear resistance, impact strength, and heat resistance. When mixed with asphalt, it not only changes the mechanical properties and heat resistance of the asphalt, but also has good phase interface, uniformity, dispersibility, and stability. Styrene-butadiene rubber has good processing performance, good elasticity and wear resistance, and anti-slip properties. Ethylene-vinyl acetate has a certain viscosity, which adjusts the viscosity of the raw material system. Attapulgite has a unique layered chain crystal structure and porous structure, which has good adsorption properties. Asphalt can enter the pores of the attapulgite and be coated by the attapulgite, thus improving the heat resistance of the asphalt.

[0009] Wood vinegar has bactericidal and disinfecting properties, improving the antibacterial properties of asphalt. Bamboo and wood powder has good mechanical properties, heat insulation, hardness, water resistance, and weather resistance. When mixed with attapulgite clay and asphalt, it improves the corresponding properties of the asphalt. Bamboo and wood powder can be loaded onto the surface and pores of attapulgite clay, thereby improving the mechanical and heat insulation properties of asphalt. Glass microspheres are lightweight, high-strength, fire-resistant, fireproof, and heat-insulating. When mixed with asphalt, they improve the high-temperature resistance of the asphalt system. Modified graphene has excellent mechanical and heat resistance properties and can be mixed with glass microspheres and attapulgite clay. Modified graphene effectively coats glass microspheres and bamboo and wood powder, improving the mechanical and high-temperature resistance of asphalt. The various raw material components in modified asphalt work together to improve the mechanical and high-temperature resistance of asphalt, making waterproof membranes made from modified asphalt widely used.

[0010] Preferably, the method for preparing the bamboo and wood powder includes the following steps:

[0011] (1) Cut bamboo into pieces and crush it, then soak it in lime water for 1-2 hours, wash it with water and filter it, then add it to sodium hydroxide solution, stir for 30-45 minutes, wash it with water and filter it to obtain powder particles;

[0012] (2) Disperse the powder particles treated in step (1) in anhydrous ethanol, add coconut fiber and stir for 2-3 hours at a stirring temperature of 65-70℃, then add high methoxyl pectin and stir for 30-35 minutes, filter, dry, grind, and obtain the treated powder particles.

[0013] (3) Grind the loofah fiber, sieve it, disperse it in deionized water, add the powder particles treated in step (2), add chitosan and malic acid, stir for 1-3 hours, filter and dry to obtain bamboo and wood powder.

[0014] By adopting the above technical solution, lime water contains abundant trace elements and limestone, which can play a strong anti-corrosion role. Lime water is used to treat bamboo to improve its anti-corrosion performance. Then it is mixed with sodium hydroxide solution. Sodium hydroxide erodes the outer surface of bamboo to a certain extent, removing the waxy layer on the surface of bamboo, which is beneficial to the subsequent post-processing of bamboo particles.

[0015] Coconut fiber has good mechanical properties and a loose, porous, and breathable structure. When mixed with bamboo particles, the bamboo particles can be loaded onto the surface and porous structure of the coconut fiber, improving the mechanical properties of the bamboo particles. Then, high-methoxyl pectin is added. High-methoxyl pectin has a certain degree of viscosity, which can enhance the connection between the bamboo particles and the coconut fiber, making the bamboo particles and coconut fiber tightly connected.

[0016] The structure of loofah fiber is grid-like, flexible and elastic, and has good mechanical properties. The powder particles obtained in step (2) can be loaded in the grid of loofah fiber. Chitosan has a certain viscosity and can coat the loofah fiber, so that the powder particles are firmly loaded in the grid of loofah fiber, thereby improving the mechanical properties of the system and helping to improve the mechanical properties of asphalt in the future.

[0017] Preferably, the mass ratio of bamboo, coconut fiber and high-methoxyl pectin is 1:0.4-0.6:0.1-0.3.

[0018] By adopting the above technical solution and further limiting the mass ratio of bamboo, coconut fiber, and high-methoxyl pectin, bamboo-wood powder with superior mechanical properties is obtained. Bamboo particles can be loaded onto the surface and pores of coconut fiber, and the high-methoxyl pectin coats the coconut fiber, increasing the connection between the bamboo particles and the coconut fiber, allowing the bamboo particles to be firmly loaded onto the coconut fiber, thereby contributing to the improvement of the corresponding mechanical properties of the bamboo-wood powder.

[0019] Preferably, the mass ratio of bamboo, loofah fiber and chitosan is 1:0.5-0.8:0.08-0.2.

[0020] By adopting the above technical solution and further limiting the mass ratio of bamboo, loofah fiber, and chitosan, bamboo and wood powder with better mechanical properties is obtained. The particles of coconut fiber and bamboo can be loaded within the network of loofah fiber. Chitosan coats the loofah fiber to a certain extent, which can increase the connection between the particles of coconut fiber and bamboo and the loofah fiber, so that the particles of coconut fiber and bamboo are firmly loaded on the loofah fiber, thereby helping to improve the corresponding mechanical properties of bamboo and wood powder.

[0021] Preferably, the pretreatment of the glass microspheres includes the following steps: immersing hollow glass microspheres in hydrogen peroxide at a temperature of 120-150℃ for 1-2 hours, washing with water, then adding nano-titanium dioxide particles, stirring for 15-20 minutes, washing with water again, and drying to obtain pretreated hollow glass microspheres.

[0022] By adopting the above technical solution, hollow glass microspheres are oxidized with hydrogen peroxide, which makes the surface of the glass microspheres rough and porous, improving the specific surface area of ​​the glass microspheres. Heating helps to accelerate the oxidation reaction rate, and nano-titanium dioxide particles can be loaded in the pores on the surface of the glass microspheres, thereby increasing the specific surface area of ​​the glass microspheres. Hollow glass microspheres have good adsorption properties and can adsorb nano-titanium dioxide particles.

[0023] Nano-titanium dioxide particles possess strong ultraviolet absorption capacity, stable optical properties, good dispersibility, large specific surface area, and high surface bonding energy. They also exhibit excellent mechanical properties and good high-temperature resistance. Hollow glass microspheres, on the other hand, possess high compressive strength, high melting point, low density, good flame retardancy, and a low coefficient of thermal shrinkage. The combined properties of nano-titanium dioxide particles and hollow glass microspheres result in pretreated glass microspheres with superior mechanical and high-temperature resistance properties. When subsequently applied to asphalt, these microspheres improve the tensile strength, impact strength, hardness, and other mechanical properties, as well as the asphalt's high-temperature resistance.

[0024] Preferably, the method for preparing the modified graphene includes the following steps:

[0025] (1) Disperse graphene in anhydrous ethanol, sonicate for 1-2 hours, add sodium alkylphenol polyoxyethylene ether sulfate, continue sonication, and set aside;

[0026] (2) Add alumina nanoparticles to the graphene solution treated in step (1), stir for 1-2 hours, then add an amino-containing silane coupling agent, stir for 2-3 hours, and set aside.

[0027] (3) Add silicon carbide particles to the graphene solution treated in step (2) and stir for 1-2 hours to obtain modified graphene.

[0028] By employing the above technical solution, graphene and sodium alkylphenol polyoxyethylene ether sulfate are mixed to improve the surface activity of graphene, which helps in the dispersion of graphene. Alumina nanoparticles are loaded on the surface of graphene. Graphene has good mechanical properties and high temperature resistance, while alumina nanoparticles have good extinction effect on infrared radiation and have good surface strength, wear resistance, corrosion resistance, insulation properties, and high temperature resistance, thereby increasing the corresponding properties of graphene. Then, an amino-containing silane coupling agent is added to crosslink with graphene. The alumina nanoparticles are loaded in the crosslinked structure formed by the amino-containing silane coupling agent and graphene, which further increases the structural stability of alumina nanoparticles in the graphene system and helps to ensure the excellent performance of graphene.

[0029] Silicon carbide particles have high strength. When added to graphene and loaded into the cross-linked network structure formed by graphene, they enhance the mechanical strength of the graphene structure. At the same time, they can adjust the viscosity of the system, which helps to regulate the dispersibility of the raw material components of the graphene system. Furthermore, they further improve the heat resistance of the graphene system. Combined with alumina nanoparticles and amino-containing silane coupling agents, they further improve the mechanical properties and heat resistance of graphene, which helps to improve the corresponding properties of asphalt in the future.

[0030] Preferably, the mass ratio of the graphene, alumina nanoparticles and amino-containing silane coupling agent is 1:0.1-0.3:0.05-0.1.

[0031] By adopting the above technical solution and further limiting the mass ratio of graphene, alumina nanoparticles, and amino-containing silane coupling agent, modified graphene with superior mechanical and heat resistance properties is obtained. Alumina nanoparticles are loaded on the surface of graphene, and the amino-containing silane coupling agent undergoes a cross-linking reaction with graphene. This allows the alumina nanoparticles to be encapsulated within the cross-linked structure formed by graphene and amino-containing silane coupling agent, increasing the structural stability of the alumina nanoparticles and making them more firmly loaded within the network structure of graphene and amino-containing silane coupling agent. This, in turn, helps to improve the corresponding mechanical and heat resistance properties of the modified graphene.

[0032] Preferably, the stabilizer is selected from one or more of vinyltriethoxysilane, vinyltrichlorosilane, and vinyltrimethoxysilane.

[0033] By adopting the above technical solution, the stabilizer helps to mix the raw material components in the asphalt system evenly, while also helping to ensure the storage stability of the asphalt system and the service life of the prepared modified asphalt layer.

[0034] Preferably, the antioxidant is selected from one or more of butylated hydroxytoluene, butylated hydroxyanisole, propyl gallate, and tert-butylhydroquinone.

[0035] By adopting the above technical solutions, antioxidants help delay the aging of asphalt during use, extend the service life of asphalt, and thus increase the service life of modified asphalt layers.

[0036] Secondly, this application also provides a method for preparing a high-temperature resistant modified bitumen waterproof membrane, comprising the following steps: mixing bitumen, polyethylene, styrene-butadiene rubber, ethylene-vinyl acetate attapulgite, wood vinegar, bamboo and wood powder, glass microspheres, modified graphene, antioxidant and stabilizer evenly, melting and extruding to obtain a sheet, then adhering the sheet to a base layer, then adhering a PE film to the side of the sheet away from the base layer, and then drying to obtain a high-temperature resistant modified bitumen waterproof membrane.

[0037] By adopting the above technical solution and the above steps to prepare high-temperature resistant modified bitumen waterproof membrane, the raw materials are mixed evenly, which makes the process easy and the operation simple. This improves the impact resistance and heat resistance of the high-temperature resistant modified bitumen waterproof membrane, which is conducive to subsequent industrial production.

[0038] In summary, this application has the following beneficial effects:

[0039] 1. The waterproof membrane composed of the base layer, modified asphalt layer, and PE film in this application has good waterproof performance and high temperature resistance. In the raw material components of the modified asphalt layer, other raw materials are added to modify the asphalt. Polyethylene has excellent mechanical properties, high wear resistance, impact strength, and heat resistance. When mixed with asphalt, it not only changes the mechanical properties and heat resistance of the asphalt, but also has good phase interface, uniformity, dispersibility, and stability. Styrene-butadiene rubber has good processing performance, good elasticity and wear resistance, and anti-slip properties. Ethylene-vinyl acetate has a certain viscosity, which adjusts the viscosity of the raw material system. Attapulgite has a unique layered chain crystal structure and porous structure, which has good adsorption properties. Asphalt can enter the pores of the attapulgite and be coated by the attapulgite, thus improving the heat resistance of the asphalt.

[0040] 2. In this application, bamboo and wood powder possesses good mechanical properties, thermal insulation, hardness, water resistance, and weather resistance. When mixed with attapulgite and asphalt, it improves the corresponding properties of the asphalt. Bamboo and wood powder can be loaded onto the surface and pores of attapulgite, thereby improving the mechanical and thermal insulation properties of the asphalt. Glass microspheres are lightweight, high-strength, fire-resistant, fireproof, and thermally insulating. When mixed with asphalt, they improve the high-temperature resistance of the asphalt system. Modified graphene has excellent mechanical and heat resistance properties and can be mixed with glass microspheres and attapulgite. Modified graphene effectively coats glass microspheres and bamboo and wood powder, improving the mechanical and high-temperature resistance of the asphalt. The various raw material components in the modified asphalt work together to improve the mechanical and high-temperature resistance of the asphalt, enabling the waterproof membrane prepared from modified asphalt to be widely used.

[0041] 3. In this application, bamboo particles can be loaded onto the surface and pores of coconut fiber. The high-methoxyl pectin coats the coconut fiber to a certain extent, which can increase the connection between bamboo particles and coconut fiber, so that the bamboo particles are firmly loaded on the coconut fiber, thereby helping to improve the corresponding mechanical properties of bamboo and wood powder. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the embodiments.

[0043] The raw materials used in the examples and comparative examples are all commercially available; the stabilizer is vinyltriethoxysilane and the antioxidant is butylated hydroxytoluene.

[0044] Example of bamboo and wood powder preparation

[0045] Preparation Example 1-1

[0046] The preparation method of bamboo and wood powder includes the following steps:

[0047] (1) Cut 3kg of bamboo into pieces and crush it, then soak it in 5L of lime water with a mass concentration of 30% for 2 hours, wash it with water and filter it, then add it to 3.5L of sodium hydroxide solution with a mass concentration of 10%, stir for 45 minutes, wash it with water and filter it to obtain powder particles.

[0048] (2) Disperse the powder particles treated in step (1) in 2.5L of anhydrous ethanol, add coconut fiber and stir for 3h at a stirring temperature of 70℃, then add high methoxyl pectin and stir for 30min, filter, dry and grind to obtain the treated powder particles; (3) Grind the loofah fiber, pass it through a 50-mesh sieve, then disperse it in 2.5L of deionized water, add the powder particles treated in step (2), then add chitosan and 0.5L of malic acid with a mass concentration of 15%, stir for 3h, filter and dry to obtain bamboo and wood powder.

[0049] The mass ratio of bamboo, coconut fiber, and high-methoxyl pectin is 1:0.4:0.3.

[0050] The mass ratio of bamboo, loofah fiber and chitosan is 1:0.5:0.2.

[0051] Preparation Examples 1-2

[0052] The difference from preparation example 1-1 is that no coconut fiber is added in step (2).

[0053] Preparation Examples 1-3

[0054] The difference from Preparation Example 1-1 is that in step (2), high-methoxyl pectin is not added.

[0055] Preparation Examples 1-4

[0056] The difference from preparation example 1-1 is that no loofah fiber is added in step (3).

[0057] Preparation Examples 1-5

[0058] The difference from preparation example 1-1 is that chitosan is not added in step (3).

[0059] Preparation Examples 1-6

[0060] The difference from Preparation Example 1-1 is that the mass ratio of bamboo, coconut fiber and high-methoxyl pectin is 1:0.6:0.1.

[0061] Preparation Examples 1-7

[0062] The difference from Preparation Example 1-1 is that the mass ratio of bamboo, coconut fiber and high-methoxyl pectin is 1:0.9:0.05.

[0063] Preparation Examples 1-8

[0064] The difference from Preparation Example 1-1 is that the mass ratio of bamboo, loofah fiber and chitosan is 1:0.8:0.08.

[0065] Preparation Examples 1-9

[0066] The difference from Preparation Example 1-1 is that the mass ratio of bamboo, loofah fiber and chitosan is 1:0.2:0.5.

[0067] Preparation example of modified graphene

[0068] Preparation Example 2-1

[0069] The preparation method of modified graphene includes the following steps:

[0070] (1) Disperse 0.5g of graphene in 2L of anhydrous ethanol, sonicate for 2h, add 0.2kg of sodium alkylphenol polyoxyethylene ether sulfate, continue sonicating, and set aside;

[0071] (2) Add alumina nanoparticles to the graphene solution treated in step (1), stir for 2 hours, then add an amino-containing silane coupling agent, stir for 3 hours, and set aside.

[0072] (3) Add 0.5 kg of silicon carbide particles to the graphene solution treated in step (2) and stir for 2 h to obtain modified graphene; wherein the mass ratio of graphene, alumina nanoparticles and amino-containing silane coupling agent is 1:0.1:0.05.

[0073] Preparation Example 2-2

[0074] The difference from preparation example 2-1 is that alumina nanoparticles are not added in step (2).

[0075] Preparation Examples 2-3

[0076] The difference from preparation example 2-1 is that in step (2), no amino-containing silane coupling agent is added.

[0077] Preparation Examples 2-4

[0078] The difference from preparation example 2-1 is that silicon carbide particles are not added in step (3).

[0079] Preparation Examples 2-5

[0080] The difference from Preparation Example 2-1 is that the mass ratio of graphene, alumina nanoparticles and amino-containing silane coupling agent is 1:0.3:0.1.

[0081] Preparation Examples 2-6

[0082] The difference from Preparation Example 2-1 is that the mass ratio of graphene, alumina nanoparticles and amino-containing silane coupling agent is 1:0.6:0.01.

[0083] Example

[0084] Example 1

[0085] A high-temperature resistant modified bitumen waterproof membrane includes a base layer, a modified bitumen layer, and a PE film arranged sequentially. The raw material components of the modified bitumen layer, by weight, include the following raw materials: 90 kg of bitumen, 30 kg of polyethylene, 22 kg of styrene-butadiene rubber, 12 kg of ethylene-vinyl acetate, 15 kg of attapulgite, 20 kg of wood vinegar, 15 kg of bamboo and wood powder, 12 kg of glass microspheres, 30 kg of modified graphene, 2.5 kg of antioxidant, and 1.5 kg of stabilizer.

[0086] The preparation method of the above-mentioned high-temperature resistant modified bitumen waterproof membrane includes the following steps: mixing bitumen, polyethylene, styrene-butadiene rubber, ethylene-vinyl acetate attapulgite clay, wood vinegar, bamboo and wood powder, glass microspheres, modified graphene, antioxidant and stabilizer evenly, melting and extruding to obtain a sheet, then hot-pressing the sheet onto the base layer, then hot-pressing a PE film onto the side of the sheet away from the base layer, and then drying to obtain the high-temperature resistant modified bitumen waterproof membrane.

[0087] The pretreatment of glass microspheres includes the following steps: 0.1 kg of hollow glass microspheres are soaked in 2 L of 12% hydrogen peroxide at 150°C for 2 hours, washed with water, then 0.2 kg of nano titanium dioxide particles are added, stirred for 20 minutes, washed with water again, and dried to obtain pretreated hollow glass microspheres.

[0088] Bamboo and wood powder was prepared using Preparation Example 1-1, and modified graphene was prepared using Preparation Example 2-1.

[0089] Example 2

[0090] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-2.

[0091] Example 3

[0092] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-3.

[0093] Example 4

[0094] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-4.

[0095] Example 5

[0096] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-5.

[0097] Example 6

[0098] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-6.

[0099] Example 7

[0100] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-7.

[0101] Example 8

[0102] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-8.

[0103] Example 9

[0104] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is prepared using Preparation Examples 1-9.

[0105] Example 10

[0106] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the bamboo and wood powder is commercially available.

[0107] Example 11

[0108] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is prepared using Preparation Example 2-2.

[0109] Example 12

[0110] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-3.

[0111] Example 13

[0112] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-4.

[0113] Example 14

[0114] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-5.

[0115] Example 15

[0116] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is prepared using Preparation Examples 2-6.

[0117] Example 16

[0118] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the raw material components of the modified bitumen layer, by weight, include the following raw materials: 80 kg of bitumen, 25 kg of polyethylene, 18 kg of styrene-butadiene rubber, 15 kg of ethylene-vinyl acetate, 10 kg of attapulgite, 15 kg of wood vinegar, 20 kg of bamboo and wood powder, 8 kg of glass microspheres, 35 kg of modified graphene, 2 kg of antioxidant, and 1 kg of stabilizer.

[0119] Example 17

[0120] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the raw material components of the modified bitumen layer, by weight, include the following raw materials: 100 kg bitumen, 25 kg polyethylene, 25 kg styrene-butadiene rubber, 10 kg ethylene-vinyl acetate, 20 kg attapulgite, 15 kg wood vinegar, 10 kg bamboo and wood powder, 18 kg glass microspheres, 28 kg modified graphene, 3 kg antioxidant, and 2 kg stabilizer.

[0121] Example 18

[0122] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that no nano-titanium dioxide particles are added during the pretreatment of the glass microspheres.

[0123] Example 19

[0124] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the glass microspheres are commercially available.

[0125] Comparative Example

[0126] Comparative Example 1

[0127] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the raw material components of the modified bitumen layer, by weight, include the following raw materials: 70 kg bitumen, 45 kg polyethylene, 28 kg styrene-butadiene rubber, 8 kg ethylene-vinyl acetate, 5 kg attapulgite, 30 kg wood vinegar, 8 kg bamboo and wood powder, 6 kg glass microspheres, 39 kg modified graphene, 1 kg antioxidant, and 3 kg stabilizer.

[0128] Comparative Example 2

[0129] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the raw material components of the modified bitumen layer, by weight, include the following raw materials: 110 kg bitumen, 15 kg polyethylene, 12 kg styrene-butadiene rubber, 25 kg ethylene-vinyl acetate, 25 kg attapulgite, 12 kg wood vinegar, 25 kg bamboo and wood powder, 28 kg glass microspheres, 25 kg modified graphene, 4 kg antioxidant, and 0.5 kg stabilizer.

[0130] Comparative Example 3

[0131] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that it does not contain bamboo or wood powder.

[0132] Comparative Example 4

[0133] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that it does not contain modified graphene.

[0134] Comparative Example 5

[0135] A high-temperature resistant modified bitumen waterproof membrane differs from Example 1 in that the modified graphene is replaced by an equal amount of graphene.

[0136] Performance testing

[0137] The high-temperature resistant modified bitumen waterproof membranes prepared in Examples 1-19 and Comparative Examples 1-5 were subjected to performance tests. The tensile strength, elongation at maximum tensile strength, and high-temperature resistance were tested according to the method in JC / T974-2005. The results are shown in Table 1.

[0138] Table 1 Test data for the examples and comparative examples

[0139]

[0140] As can be seen from Table 1, the high-temperature resistant modified bitumen waterproof membranes prepared in Examples 1, 6, 8, 14, and 16-17 of this application have good mechanical properties and high-temperature resistance. Among them, the data prepared in Example 1 are the best, with a longitudinal tensile strength of 910 N / 50 mm, a transverse tensile strength of 850 N / 50 mm, an elongation of 52.3% under the maximum longitudinal tensile strength, and an elongation of 45.1% under the maximum transverse tensile strength. At the same time, the waterproof membrane does not slip, flow, or drip at 130°C, indicating that the high-temperature resistant modified bitumen waterproof membranes prepared in this application have good mechanical properties and high-temperature resistance, which enables the waterproof membranes prepared from modified bitumen to be widely used.

[0141] In Example 2, no coconut fiber was added in the preparation method of bamboo and wood powder. In Example 3, no high-methoxyl pectin was added in the preparation method of bamboo and wood powder. In Example 7, the mass ratio of bamboo, coconut fiber, and high-methoxyl pectin was changed. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced, while the high-temperature resistance remained basically unchanged. This indicates that coconut fiber has better mechanical properties. Bamboo particles can be loaded on the surface and porous structure of coconut fiber, improving the mechanical properties of bamboo particles. High-methoxyl pectin has a certain degree of viscosity, which can enhance the connection between bamboo particles and coconut fiber, making the bamboo particles and coconut fiber tightly connected. The synergistic effect of bamboo, coconut fiber, and high-methoxyl pectin helps to improve the corresponding mechanical properties of bamboo and wood powder.

[0142] In Example 4, the bamboo and wood powder preparation method did not include loofah fiber. In Example 5, the bamboo and wood powder preparation method did not include chitosan. In Example 9, the mass ratio of bamboo, loofah fiber, and chitosan was changed. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced, while the high-temperature resistance remained basically unchanged. This indicates that the loofah fiber structure is mesh-like, flexible, and elastic. The particles of coconut fiber and bamboo mixture can be loaded within the mesh of loofah fiber. Chitosan coats the loofah fiber to a certain extent, which can increase the connection between the coconut fiber and bamboo mixture particles and the loofah fiber, so that the coconut fiber and bamboo mixture particles are firmly loaded on the loofah fiber, thereby helping to improve the corresponding mechanical properties of bamboo and wood powder.

[0143] The bamboo and wood powder in Example 10 was commercially available. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced, while the high-temperature resistance remained basically unchanged. This indicates that the bamboo and wood powder prepared in this application has superior performance and helps to improve the mechanical properties and high-temperature resistance of asphalt.

[0144] In Example 11, the modified graphene preparation method did not include alumina nanoparticles. Table 1 shows that, compared to Example 1, the mechanical properties were significantly reduced, and the high-temperature resistance was worse. There was no slippage, flow, or dripping at 110℃, indicating that the alumina nanoparticles possess good surface strength, wear resistance, corrosion resistance, insulation properties, and high-temperature resistance, thus affecting the corresponding properties of graphene. In Example 12, the modified graphene preparation method did not include amino-containing silane coupling agents. Table 1 shows that, compared to Example 1, the mechanical properties were significantly reduced, and the high-temperature resistance was worse. There was no slippage at 120℃. In Example 15, the mass ratio of graphene, alumina nanoparticles, and amino-containing silane coupling agent was changed. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced and the high-temperature resistance was worse. There was no slippage, flow, or dripping at 125°C, indicating that the alumina nanoparticles were loaded on the surface of the graphene, and the amino-containing silane coupling agent underwent a cross-linking reaction with the graphene. This allowed the alumina nanoparticles to be coated within the cross-linked structure formed by the graphene and the amino-containing silane coupling agent, thereby helping to improve the corresponding mechanical and heat resistance properties of the modified graphene.

[0145] In Example 13, no silicon carbide particles were added to the modified graphene preparation method. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced. The high temperature resistance was good at 120°C with no slippage, flow, or dripping, indicating that the silicon carbide particles have high strength. When loaded in the cross-linked network structure formed by graphene, they enhance the mechanical strength and high temperature resistance of the graphene structure.

[0146] In Example 18, no nano-titanium dioxide particles were added during the pretreatment of the glass microspheres. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced, and the high-temperature resistance was maintained at 110°C without sliding, flowing, or dripping. This indicates that the nano-titanium dioxide particles can be loaded into the pores on the surface of the glass microspheres, improving the mechanical properties and high-temperature resistance of the glass microspheres.

[0147] Example 19: Glass microspheres were commercially available. As shown in Table 1, compared with Example 1, the mechanical properties were significantly reduced, and the high-temperature resistance was such that there was no slippage, flow, or dripping at 100°C. This indicates that the glass microspheres prepared in this application have superior performance and can help improve the mechanical properties and high-temperature resistance of asphalt.

[0148] Comparative Examples 1-2 varied the amount of raw materials used in the high-temperature modified bitumen waterproof membrane. As shown in Table 1, compared with Example 1, the tensile strength, elongation at maximum tensile strength, and high-temperature resistance all decreased significantly. This indicates that the high-temperature modified bitumen waterproof membrane has good mechanical properties and high-temperature resistance when the raw material components are mixed in a certain proportion. The change in the amount of each raw material affects the corresponding properties of the high-temperature modified bitumen waterproof membrane.

[0149] Comparative Example 3, without the addition of bamboo and wood powder, shows in Table 1 that, compared to Example 1, the tensile strength and elongation at maximum tensile strength both decreased significantly, while the high-temperature resistance remained basically unchanged. This indicates that bamboo and wood powder significantly affects the mechanical properties of the high-temperature resistant modified bitumen waterproof membrane. Comparative Example 4, without the addition of modified graphene, shows that, compared to Example 1, the tensile strength, elongation at maximum tensile strength, and high-temperature resistance all decreased significantly. This indicates that the addition of modified graphene significantly affects the mechanical properties and high-temperature resistance of the high-temperature resistant modified bitumen waterproof membrane. Comparative Example 5, where the modified graphene was replaced by an equal amount of graphene, shows that, compared to Example 1, the tensile strength, elongation at maximum tensile strength, and high-temperature resistance all decreased significantly. This indicates that the modified graphene in this application has better mechanical properties and high-temperature resistance, thus affecting the corresponding properties of the high-temperature resistant modified bitumen waterproof membrane.

[0150] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-temperature resistant modified bitumen waterproof membrane, characterized in that, The material comprises a base layer, a modified asphalt layer, and a PE film arranged sequentially. The raw material components of the modified asphalt layer, by weight, include the following raw materials: 80-100 parts asphalt, 25-35 parts polyethylene, 18-25 parts styrene-butadiene rubber, 10-15 parts ethylene-vinyl acetate, 10-20 parts attapulgite, 15-25 parts wood vinegar, 10-20 parts bamboo and wood powder, 8-18 parts glass microspheres, 28-35 parts modified graphene, 2-3 parts antioxidant, and 1-2 parts stabilizer. The method for preparing the bamboo and wood powder includes the following steps: (1) Cut bamboo into pieces and crush it, then soak it in lime water for 1-2 hours, wash it with water and filter it, then add it to sodium hydroxide solution, stir for 30-45 minutes, wash it with water and filter it to obtain powder particles; (2) Disperse the powder particles treated in step (1) in anhydrous ethanol, add coconut fiber and stir for 2-3 hours at a stirring temperature of 65-70℃, then add high methoxyl pectin and stir for 30-35 minutes, filter, dry, grind, and obtain the treated powder particles. (3) Grind the loofah fiber, sieve it, then disperse it in deionized water, add the powder particles treated in step (2), then add chitosan and malic acid, stir for 1-3 hours, filter, dry, and obtain bamboo and wood powder; The pretreatment of the glass microspheres includes the following steps: immersing hollow glass microspheres in hydrogen peroxide at a temperature of 120-150℃ for 1-2 hours, washing with water, then adding nano titanium dioxide particles, stirring for 15-20 minutes, washing with water again, and drying to obtain pretreated hollow glass microspheres. The method for preparing the modified graphene includes the following steps: (1) Disperse graphene in anhydrous ethanol, sonicate for 1-2 hours, add sodium alkylphenol polyoxyethylene ether sulfate, continue sonication, and set aside; (2) Add alumina nanoparticles to the graphene solution treated in step (1), stir for 1-2 hours, then add an amino-containing silane coupling agent, stir for 2-3 hours, and set aside. (3) Add silicon carbide particles to the graphene solution treated in step (2) and stir for 1-2 hours to obtain modified graphene.

2. The high-temperature resistant modified bitumen waterproof membrane according to claim 1, characterized in that, The mass ratio of bamboo, coconut fiber and high-methoxyl pectin is 1:0.4-0.6:0.1-0.

3.

3. The high-temperature resistant modified bitumen waterproof membrane according to claim 1, characterized in that, The mass ratio of bamboo, loofah fiber and chitosan is 1:0.5-0.8:0.08-0.

2.

4. The high-temperature resistant modified bitumen waterproof membrane according to claim 1, characterized in that, The mass ratio of the graphene, alumina nanoparticles and amino-containing silane coupling agent is 1:0.1-0.3:0.05-0.

1.

5. The high-temperature resistant modified bitumen waterproof membrane according to claim 1, characterized in that, The stabilizer is selected from one or more of vinyltriethoxysilane, vinyltrichlorosilane, and vinyltrimethoxysilane.

6. The high-temperature resistant modified bitumen waterproof membrane according to claim 1, characterized in that, The antioxidant is selected from one or more of butylated hydroxytoluene, butylated hydroxyanisole, propyl gallate, and tert-butylhydroquinone.

7. A method for preparing a high-temperature resistant modified bitumen waterproof membrane according to any one of claims 1-6, characterized in that, The process includes the following steps: mixing asphalt, polyethylene, styrene-butadiene rubber, ethylene-vinyl acetate attapulgite clay, wood vinegar, bamboo and wood powder, glass microspheres, modified graphene, antioxidants, and stabilizers evenly, melting and extruding to obtain a sheet, then adhering the sheet to the base layer, then adhering a PE film to the side of the sheet away from the base layer, and then drying to obtain a high-temperature resistant modified asphalt waterproof membrane.

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