Environment-friendly modified asphalt, composition for preparing environment-friendly modified asphalt, environment-friendly modified asphalt waterproof coiled material and preparation method of environment-friendly modified asphalt waterproof coiled material

Abstract

The invention provides environment-friendly modified asphalt, a composition for preparing the environment-friendly modified asphalt, an environment-friendly modified asphalt waterproof coiled material and a preparation method of the environment-friendly modified asphalt waterproof coiled material. The composition for preparing the environment-friendly modified asphalt comprises matrix asphalt A, matrix asphalt B, rubber powder, filler, a modifier, a polyolefin thermoplastic elastomer, tackifying resin, a rubber activator, a nano activation catalyst, an organic peroxide initiator, a bio-based grafting agent containing an epoxy group and a plant-based softening agent.

Description

Technical Field

[0001] This disclosure pertains to the field of asphalt technology, and particularly relates to an environmentally friendly modified asphalt, a composition for preparing environmentally friendly modified asphalt, an environmentally friendly modified asphalt waterproof membrane, and a method for preparing the same. Background Technology

[0002] The production of waste tires is increasing daily, and traditional landfilling or incineration of waste tires easily creates a serious environmental burden, polluting the soil and air. Therefore, promoting the recycling of waste tires and rubber is particularly important, as it can not only save on waste management and environmental remediation costs, but also conserve petroleum resources and reduce carbon emissions, resulting in significant environmental and economic benefits.

[0003] Currently, the main methods for recycling waste tires include preparing rubber powder, reclaimed rubber, or high-temperature pyrolysis regeneration. However, the methods of preparing reclaimed rubber or high-temperature pyrolysis regeneration from waste tires have stringent equipment requirements, and economic and energy consumption issues are prominent. Utilizing rubber powder to further prepare rubber-modified asphalt has certain cost advantages and is widely used, but due to the stable structure of the rubber powder, it can only physically swell in asphalt, resulting in a utilization rate of less than 10%. Furthermore, rubber-modified asphalt suffers from poor thermal stability, easy segregation, and high processing difficulty, thus affecting its performance. Although activation and other treatments can improve the utilization rate of the rubber powder, the processing technology is complex, time-consuming, and requires additional pretreatment, equipment, and energy investment, increasing costs and production complexity, thus limiting its widespread application. Summary of the Invention

[0004] In view of the above, the main objective of this disclosure is to provide an environmentally friendly modified bitumen, a composition for preparing environmentally friendly modified bitumen, an environmentally friendly modified bitumen waterproof membrane and a method for preparing the same, in order to at least partially solve at least one of the aforementioned technical problems.

[0005] To achieve the above objectives, the technical solution disclosed herein is as follows:

[0006] In one aspect of this disclosure, a composition for preparing environmentally friendly modified bitumen is provided, comprising:

[0007] Base asphalt A, base asphalt B, rubber powder, filler, modifier, polyolefin thermoplastic elastomer, tackifying resin, rubber activator, nano-activated catalyst, organic peroxide initiator, bio-based grafting agent containing epoxy groups, plant-based softener.

[0008] In a second aspect of this disclosure, a method for preparing environmentally friendly modified asphalt is provided, comprising:

[0009] Base asphalt A and base asphalt B are heated to melt, and modifiers, polyolefin thermoplastic elastomers, and tackifying resins are added. Colloidal grinding is carried out while the temperature is raised simultaneously.

[0010] When the temperature reaches 155~160℃, add adhesive powder and plant-based softener, and keep the colloidal grinding state to carry out pre-swelling and pre-activation reaction.

[0011] When the temperature reaches 165~170℃, add rubber activator and nano-activation catalyst, continue colloidal grinding and stir and heat at the first stirring frequency to activate the rubber molecular chain bond breaking and form activated rubber free radicals.

[0012] When the temperature reaches 170~175℃, add a bio-based grafting agent containing epoxy groups, maintain colloid grinding and stir and heat at the second stirring frequency, so that the bio-based grafting agent containing epoxy groups reacts with the activated rubber free radicals.

[0013] When the temperature reaches 180~190℃, add the organic peroxide initiator, turn off the colloid mill, and stir to cure at the second stirring frequency; maintain the temperature at 180~190℃, add filler and stir to obtain modified asphalt.

[0014] In a third aspect of this disclosure, an environmentally friendly modified bitumen waterproof membrane is provided, comprising:

[0015] The layers stacked from bottom to top are: a lower isolation layer, a lower modified asphalt layer, a base course, an upper modified asphalt layer, and an upper isolation layer.

[0016] The upper and lower modified asphalt layers are prepared by drying the environmentally friendly modified asphalt obtained by the above method into a film.

[0017] In a fourth aspect of this disclosure, a method for preparing the above-mentioned environmentally friendly modified bitumen waterproof membrane is provided, comprising:

[0018] The base layer is impregnated with pre-impregnated oil to obtain the impregnated base layer;

[0019] The impregnated base layer is coated with environmentally friendly modified asphalt on both the top and bottom, and then squeezed and dried to obtain a lower modified asphalt layer and an upper modified asphalt layer.

[0020] A lower isolation layer and an upper isolation layer are laid on the surfaces of the lower modified asphalt layer and the upper modified asphalt layer, respectively, to form an environmentally friendly modified asphalt waterproof membrane.

[0021] According to embodiments of this disclosure, a composition for preparing environmentally friendly modified asphalt is provided. Through the synergistic effect of a rubber activator, a nano-activating catalyst, an organic peroxide initiator, and an epoxy-containing bio-based grafting agent, a three-in-one reaction mechanism of "activation bond breaking - grafting bridging - reaction curing" is achieved. This allows for deep activation of rubber powder without the need for high-temperature, high-pressure pretreatment equipment and energy consumption. This streamlines the process of rubber-modified asphalt production, significantly reduces energy consumption, and provides a new environmentally friendly manufacturing path for building waterproofing materials. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments.

[0023] The endpoints and any values ​​of the ranges disclosed in this disclosure are not limited to the precise ranges or values, and such ranges or values ​​should be understood to include values ​​close to such ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in this disclosure.

[0024] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0025] Currently, the preparation of reclaimed rubber or high-temperature pyrolysis oil from rubber powder has a high utilization rate, but it suffers from problems such as large equipment investment (approximately 40% of total production costs) and high energy consumption (800 kWh / ton). While directly using rubber powder in the preparation of modified asphalt is low-cost and harmless, the stable structure of the rubber powder allows for only physical swelling, resulting in an effective utilization rate of less than 10%. Furthermore, the modified asphalt suffers from poor thermal stability, easy segregation, and processing difficulties. Traditional rubber powder activation, desulfurization, or grafting technologies can increase the utilization rate to 20%, but these processes are complex, time-consuming, require pretreatment, and involve additional equipment and energy investment. Therefore, there is an urgent need to develop an environmentally friendly modified asphalt composition to solve the problems of low rubber powder utilization, poor modified asphalt performance, and the high cost and complex processes of traditional activation technologies.

[0026] Based on this, this disclosure proposes an environmentally friendly modified asphalt and its preparation method. Through the synergistic effect of a rubber activator, a nano-activation catalyst, an organic peroxide initiator, and an epoxy-containing bio-based grafting agent, a three-in-one reaction mechanism of "activation bond breaking - grafting bridging - reaction curing" is constructed. The rubber activator can disrupt the stable structure of the rubber powder to promote bond breaking. Combined with the nano-activation catalyst, the activation rate can be increased by approximately two times while inhibiting the binding of fracture free radicals, laying the foundation for deep activation. The organic peroxide initiator and the bio-based grafting agent achieve bridging and curing by initiating a grafting reaction. Ultimately, without the need for high-temperature, high-pressure equipment and additional energy consumption, low-temperature deep activation of rubber can be achieved in a conventional mixing tank, enabling the sol fraction to reach 2-3 times that of traditional activation methods. Furthermore, the preparation method of the environmentally friendly modified asphalt is compatible with traditional production processes, reducing the process flow by approximately 60% and significantly lowering energy consumption, providing a new environmentally friendly manufacturing path for building waterproofing materials.

[0027] According to one aspect of the present disclosure, a composition for preparing environmentally friendly modified asphalt is provided, comprising: base asphalt A, base asphalt B, rubber powder, filler, modifier, polyolefin thermoplastic elastomer, tackifying resin, rubber activator, nano-activated catalyst, organic peroxide initiator, epoxy-containing bio-based grafting agent, and plant-based softener.

[0028] According to embodiments of this disclosure, a composition for preparing environmentally friendly modified asphalt is provided. Through the synergistic effect of a rubber activator, a nano-activating catalyst, an organic peroxide initiator, and a bio-based grafting agent containing epoxy groups, a three-in-one reaction mechanism of "activation bond breaking - grafting bridging - reaction curing" is achieved. The specific reaction is as follows:

[0029] Bond Activation: Rubber activators can specifically break the cross-linked structures such as disulfide bonds (SS bonds) and carbon-sulfur bonds (SC bonds) of rubber molecules in rubber powder, causing the rubber molecular chains to depolymerize and generate active free radicals, providing sites for subsequent reactions and improving the degree of rubber activation and utilization. Simultaneously, nano-activated catalysts, with their high specific surface area, enhance catalytic activity. On the one hand, they accelerate the efficiency of chemical bond breaking by the activator; on the other hand, they inhibit the recombination of broken free radicals through adsorption, ensuring system stability and promoting the depth of the activation reaction.

[0030] Grafting bridging: Bio-based grafting agents containing epoxy groups serve as bridging media. Their epoxy groups can undergo grafting reactions with the activated rubber free radicals, stabilizing the free radicals through chemical bonding and preventing reaction stagnation caused by their repolymerization. This process not only reinforces the activation and bond-breaking effects but also, leveraging the polar characteristics of bio-based molecules, lays the foundation for improved compatibility between rubber and asphalt.

[0031] Reaction curing: Organic peroxide initiators generate free radicals in the system, which on the one hand promote the curing reaction between the grafted rubber active groups and the polar molecules (such as carboxyl groups) in the asphalt and asphalt resin to form a stable cross-linking network; on the other hand, they enhance the chemical bonding at the rubber-asphalt interface and significantly improve the compatibility between the two.

[0032] Through a three-in-one reaction mechanism of "activation and bond breaking - grafting and bridging - reaction and curing", the deep activation and efficient utilization of rubber powder can be achieved, while enhancing the compatibility and system stability of rubber and asphalt, ultimately improving the high-temperature performance and thermal stability of modified asphalt.

[0033] According to embodiments of this disclosure, the rubber activator includes any one of tert-butylphenol compounds, alkylphenol polysulfides, thiols, and cashew phenol condensates. The molecular structures of these compounds contain active groups that can interact with disulfide bonds (SS bonds) and carbon-sulfur bonds (SC bonds) in rubber molecules. Specifically, phenolic hydroxyl groups, sulfide groups, etc., can weaken the bond energy of sulfur bonds by forming hydrogen bonds or undergoing nucleophilic reactions with sulfur atoms in rubber molecules, promoting the breakage of rubber molecular chains to generate free radicals. This provides sufficient active sites for subsequent grafting reactions, thereby effectively improving the activation degree and utilization rate of the rubber. Simultaneously, these compounds exhibit good compatibility with rubber and asphalt systems and can continuously exert an activating effect during the reaction process. The rubber activator is preferably an alkylphenol polysulfide compound, and grades such as 590, 560, 490, and 460 can be used.

[0034] The nano-activated catalyst comprises mesoporous silica (Fe₂O₃@SiO₂) supported on iron oxide. The pore size of the mesoporous silica is 5–12 nm, for example, 5 nm, 7 nm, 9 nm, 10 nm, 12 nm, etc. The mesoporous structure not only provides highly dispersed loading sites for iron oxide, ensuring sufficient exposure of the catalytic active centers, but its porous channels can also capture free sulfur generated during the reaction through physical adsorption, effectively inhibiting vulcanization reversion and storage-term sulfur return caused by the recombination of free sulfur molecules in rubber, thus maintaining system stability. The iron oxide loading is not less than 20%, and the loading can be, for example, 20%, 25%, 30%, 35%, 40%, etc. The ferric ions (Fe₂O₃@SiO₂) in the iron oxide... 3+ As a catalytic center, it can accelerate the oxidative breaking process of SS and SC bonds in rubber molecules by rubber activators through electron transfer, significantly improving the activation reaction rate, while avoiding side reactions that may be caused by traditional catalysts, ensuring the efficiency and stability of rubber free radical generation. Organic peroxide initiators include diethylpropylbenzene peroxide (DCP). The decomposition temperature of DCP matches the temperature range required for rubber activation and grafting reactions, and can efficiently initiate the grafting reaction between bio-based grafting agents containing epoxy groups and activated rubber free radicals, while promoting the reaction between grafted activated free radicals and polar molecules of resins and asphaltenes in asphalt.

[0035] Bio-based grafting agents containing epoxy groups include epoxidized cashew ethers, wherein the epoxy value of the epoxidized cashew ether is 0.2~0.4 mol / 100g, for example, 0.2 mol / 100g, 0.25 mol / 100g, 0.3 mol / 100g, 0.35 mol / 100g, 0.4 mol / 100g, etc. As a bio-based compound, epoxidized cashew ether is derived from natural cashew nut shell oil, which can reduce dependence on petroleum-based feedstocks. Its molecular structure exhibits bidirectional reactivity: the epoxy groups on one side can react efficiently with the free radicals generated by the activated rubber to form stable graft bonds, which can effectively prevent free radical repolymerization and ensure the continuous activation and bond-breaking reaction of the rubber molecular chain, avoiding reaction stagnation; the phenolic hydroxyl groups on the other side can undergo a curing reaction with the carboxyl groups in the asphalt resin, enhancing the interfacial bonding between rubber and asphalt through chemical bonding, significantly improving the solubility and dispersion stability of rubber in asphalt, thereby improving the high-temperature deformation resistance and thermal storage stability of modified asphalt, and assisting in realizing the three-in-one reaction mechanism of "activation and bond breaking - graft bridging - reaction curing".

[0036] According to embodiments of this disclosure, the components in the composition, by weight, include:

[0037] Base bitumen A: 20-30 parts;

[0038] Base asphalt B, 20-30 parts;

[0039] 20-30 parts of adhesive powder;

[0040] 20-30 parts of filler;

[0041] 4-6 parts of modifier;

[0042] 1-2 parts of polyolefin thermoplastic elastomer;

[0043] 2-3 parts of tackifying resin;

[0044] 5-8 parts of plant-based softener;

[0045] 1-3 parts of nano-activated catalyst;

[0046] 1-2 parts of organic peroxide initiator;

[0047] 0.3-0.5 parts of rubber activator

[0048] 0.3 to 5 parts of a bio-based grafting agent containing epoxy groups.

[0049] According to embodiments of this disclosure, the base asphalt A can be, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, etc.; the base asphalt B can be, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, etc.; the rubber powder can be, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, etc.; the filler can be, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, etc.; the modifier can be, for example, 4 parts, 5 parts, 6 parts, etc.; and the polyolefin thermoplastic elastomer can be, for example, 1 part. 1.5 parts, 2 parts, etc.; tackifying resin, for example, can be 2 parts, 2.5 parts, 3 parts, etc.; plant-based softener, for example, can be 5 parts, 6 parts, 7 parts, 8 parts, etc.; nano-activated catalyst, for example, can be 1 part, 2 parts, 3 parts, etc.; organic peroxide initiator, for example, can be 1 part, 1.5 parts, 2 parts, etc.; bio-based grafting agent containing epoxy groups, for example, can be 0.3 parts, 0.5 parts, 1 part, 3 parts, 5 parts, etc.; rubber activator phase, for example, can be 0.3 parts, 0.4 parts, 0.5 parts.

[0050] According to embodiments of this disclosure, the performance of modified asphalt can be controlled by adjusting the fractions and proportions of each component and combining them accordingly. The ratio of base asphalt A to base asphalt B establishes the basic viscosity and low-temperature ductility; adjusting the amount of rubber powder balances material costs and rubber modification effects; optimizing the filler ratio adjusts the system's hardness and mechanical strength; the synergistic ratio of modifier and polyolefin thermoplastic elastomer specifically enhances elastic recovery and crack resistance; the combination of tackifying resin and plant-based softener maintains interfacial adhesion while ensuring construction fluidity; the coordinated proportions of nano-activated catalyst, organic peroxide initiator, and bio-based grafting agent precisely control the reaction process of "activation bond breaking - grafting bridging - reaction curing," ensuring deep rubber activation and system stability; and adjusting the mass percentage of the rubber activator adapts to different rubber powder activities, ensuring activation efficiency. Through the combination of these components, modified asphalt that meets the needs of different scenarios and possesses both environmental friendliness and high performance can be obtained.

[0051] According to embodiments of this disclosure, base asphalt A includes any one or more base asphalts from No. 70 to No. 130, such as No. 70 or No. 90 base asphalts. Base asphalt B includes any one or more base asphalts from No. 180 to No. 220, such as No. 200 base asphalt. By selecting base asphalts of different grades, the overall viscosity and flow properties can be adjusted after mixing to meet the requirements of material rheology under different construction environments (such as temperature and coating method), while also taking into account the balance of high and low temperature performance during use.

[0052] Rubber powder, including tire rubber powder, can be selected with a mesh size of 40-80 and an ash content of less than 15%. Rubber powder with a suitable particle size can ensure the contact area with asphalt to achieve full reaction, while avoiding the processing difficulties caused by excessively fine particle size; an ash content of less than 15% can reduce the impact of impurities on the compatibility and reactivity of the system, and improve the utilization rate of rubber and the stability of the modification effect.

[0053] The filler includes at least one of talc, fly ash, light calcium carbonate, and heavy calcium carbonate. In practical applications, for example, a 200-mesh filler can be selected. The filler material can be uniformly dispersed in the system for preparing environmentally friendly modified asphalt, effectively improving the mechanical strength, hardness, and impermeability of the modified asphalt, while effectively reducing material costs.

[0054] Modifiers include styrene-butadiene-styrene block copolymer (SBS) and styrene-butadiene rubber (SBR). SBS can be mixed or star-shaped, with a molecular weight range of 180,000 to 230,000; SBR has a molecular weight range of 100,000 to 150,000. SBS can significantly improve the elasticity, tensile strength, and high and low temperature performance of asphalt, while SBR can improve the flexibility and crack resistance of asphalt. The synergistic effect of the two can comprehensively optimize the mechanical properties and durability of modified asphalt, forming a multi-dimensional modification system when combined with other components.

[0055] Polyolefin thermoplastic elastomers include amorphous α-olefin copolymers (APAO). In practical applications, APAO with a softening point temperature of 110~130℃ can be selected. APAO has excellent thermal stability and compatibility, which can enhance the bonding strength and anti-aging properties of modified asphalt, while improving the low-temperature crack resistance and processing fluidity of the material, and synergistically improving the overall performance of the system with other components.

[0056] Tackifying resins include any one of C9 hydrogenated petroleum resins. C9 hydrogenated petroleum resins have good tackifying effects, which can improve the interfacial adhesion and initial tack of modified asphalt. They have good compatibility with asphalt and other polymer components, and the materials are readily available, which can reduce production costs and ensure system stability.

[0057] Plant-based softeners include any type of plant-based softening oil, such as pine tar or castor oil. Plant-based softening oils are derived from natural plants, meet environmental protection requirements, effectively reduce system viscosity, improve processing performance, and have good compatibility with rubber and asphalt, promoting the swelling and activation reaction of rubber powder.

[0058] According to an embodiment of the second aspect of this disclosure, a method for preparing environmentally friendly modified asphalt is provided, comprising:

[0059] Base asphalt A and base asphalt B are heated to melt, and modifiers, polyolefin thermoplastic elastomers, and tackifying resins are added. Colloidal grinding is carried out while the temperature is raised simultaneously.

[0060] When the temperature reaches 155~160℃, add adhesive powder and plant-based softener, and keep the colloidal grinding state to carry out pre-swelling and pre-activation reaction.

[0061] When the temperature reaches 165~170℃, add rubber activator and nano-activation catalyst, continue colloidal grinding and stir and heat at the first stirring frequency to activate the rubber molecular chain bond breaking and form activated rubber free radicals.

[0062] When the temperature reaches 170~175℃, add a bio-based grafting agent containing epoxy groups, maintain colloid grinding and stir and heat at the second stirring frequency, so that the bio-based grafting agent containing epoxy groups reacts with the activated rubber free radicals.

[0063] When the temperature reaches 180~190℃, add the organic peroxide initiator, turn off the colloid mill, and stir to cure at the second stirring frequency.

[0064] Maintain the temperature at 180~190℃, add filler and stir to obtain modified asphalt.

[0065] According to embodiments of this disclosure, a gradient reaction design is achieved by controlling the temperature gradient and stepwise feeding. The temperature gradient is set to match the reactivity of each component, and stepwise feeding ensures that each component intervenes at the optimal reaction stage. This allows the reactions of "pre-swelling - bond breaking activation - grafting bridging - curing reaction" to proceed efficiently and sequentially, avoiding problems such as premature runaway or delayed stagnation of the reaction, and ensuring that each step of the reaction can proceed fully under suitable conditions. At the same time, the gradient reaction effectively reduces process defects such as local overheating and uneven component dispersion, significantly improves the compatibility of the adhesive powder and asphalt, and avoids material property fluctuations caused by chaotic reactions in traditional processes. Furthermore, the method disclosed herein does not rely on high-temperature and high-pressure equipment, nor does it require the introduction of additional specialized equipment (such as high-speed shearing machines, twin-screw extruders, etc.). The orderly reaction can be achieved solely through a temperature gradient, significantly reducing energy consumption. Moreover, the step-by-step operation is compatible with ordinary mixing tanks and colloid grinding equipment. The reaction can be completed using only the mixing, grinding, and temperature control devices of traditional production lines, simplifying the production process. The production process does not require interruption or modification, and the production efficiency is on par with traditional processes. This provides convenient conditions for large-scale industrial production and helps promote the industrial application of environmentally friendly modified asphalt.

[0066] According to embodiments of this disclosure, the heating rate is 10~15℃ / h, for example, 10℃ / h, 11℃ / h, 12℃ / h, 13℃ / h, 14℃ / h, 15℃ / h, etc. By controlling the heating rate as needed, the average reaction time of the conventional system can be controlled at around 7.5h. This ensures that the reaction at each stage proceeds fully while avoiding incomplete local reactions or overheating degradation due to excessively rapid heating. This approach balances production efficiency with reduced energy consumption and time costs, achieving a balance between the economics and stability of the process.

[0067] The power of the colloid mill is 200~300kw·h, for example, it can be 200 kw·h, 220 kw·h, 250 kw·h, 280 kw·h, 300 kw·h, etc. The appropriate power range can provide sufficient shear force to promote the full mixing and dispersion of the base asphalt and each component. Especially in the pre-swelling of rubber powder and the breaking of rubber molecular chains, it can break the particle agglomeration, increase the reaction contact area, and ensure the uniformity of the system.

[0068] The first stirring frequency is 40~60 Hz, for example, it can be 40 Hz, 45 Hz, 50 Hz, 55 Hz, 60 Hz, etc. The high stirring frequency can enhance the shearing effect of colloid grinding, accelerate the diffusion of rubber activator and nano-activated catalyst, promote the uniform progress of the bond breaking reaction of rubber molecular chain, and at the same time avoid the local aggregation of activated free radicals leading to ineffective binding, thereby improving the bond breaking activation efficiency.

[0069] The second stirring frequency is 5~20 Hz, for example, it can be 5 Hz, 10 Hz, 15 Hz, 20 Hz, etc. The low stirring frequency is suitable for the grafting reaction and curing stage. It can maintain the basic fluidity of the system, ensure that the grafting agent and the activated free radicals are fully contacted and reacted, and avoid the temperature fluctuation of the system or the shearing and destruction of the grafted product caused by high-speed stirring. At the same time, it reduces the entrainment of air bubbles in the curing stage and ensures the final compactness.

[0070] According to an embodiment of the third aspect of this disclosure, an environmentally friendly modified bitumen waterproof membrane is provided, comprising: a lower isolation layer, a lower modified bitumen layer, a base layer, an upper modified bitumen layer, and an upper isolation layer stacked from bottom to top, wherein the upper modified bitumen layer and the lower modified bitumen layer are obtained by drying the environmentally friendly modified bitumen prepared by the above method into a film.

[0071] According to embodiments of this disclosure, the environmentally friendly modified bitumen waterproof membrane provided herein uses modified bitumen layers made from the environmentally friendly modified bitumen of this disclosure above and below the substrate. The modified bitumen layers utilize waste tire rubber powder and plant-based components, reducing environmental impact. Simultaneously, the modified bitumen layer possesses good strength, elasticity, and durability, and bonds tightly to the substrate, effectively improving the overall structural stability and crack resistance of the membrane, ensuring reliable performance of both waterproofing and waterproofing functions during long-term use. Combined with upper and lower isolation layers, the modified bitumen layer is further protected, preventing external contamination, wear, or adhesion during transportation, storage, and construction, ensuring the integrity of the membrane and ease of construction. The isolation layers also reduce direct erosion of the modified bitumen layer by external environmental factors (such as ultraviolet radiation and moisture), extending the service life of the membrane and making its waterproofing performance more durable and stable.

[0072] According to embodiments of this disclosure, the first isolation layer includes any one of polyethylene film, shale, fine sand, fluorocarbon film, and aluminum film; the second isolation layer includes any one of polyethylene film and fine sand; and the base layer includes any one of polyester base, glass fiber base, polyester glass fiber base, and copper base. In practical applications, suitable materials can be determined from the respective material ranges of the first and second isolation layers based on the performance requirements of the modified bitumen waterproof membrane in different scenarios, and then combined with the base layer to form a customized structural solution that meets the functional requirements of specific scenarios.

[0073] According to embodiments of this disclosure, the thickness of the base course is 0.9~1.5mm, for example, it can be 0.9 mm, 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, etc., and its thickness needs to be differentiated according to its own material characteristics. The thickness of the modified asphalt layer is greater than 1mm, and this thickness standard complies with the relevant national specifications.

[0074] According to an embodiment of the fourth aspect of this disclosure, a method for preparing the above-mentioned environmentally friendly modified bitumen waterproof membrane is provided, comprising: impregnating a base layer with pre-impregnated oil to obtain an impregnated base layer; applying environmentally friendly modified bitumen evenly to the top and bottom of the impregnated base layer, and squeezing and drying it to obtain a lower modified bitumen layer and an upper modified bitumen layer; laying a lower isolation layer and an upper isolation layer on the surfaces of the lower modified bitumen layer and the upper modified bitumen layer respectively to form an environmentally friendly modified bitumen waterproof membrane.

[0075] According to embodiments of this disclosure, the base layer is first impregnated with pre-impregnated oil, which enhances the adhesion between the base layer and the subsequently applied modified asphalt, preventing interlayer delamination and improving the overall structural stability of the roll. Secondly, by applying environmentally friendly modified asphalt evenly to both the top and bottom layers, the base layer is ensured to be uniformly wrapped, guaranteeing consistency with waterproofing performance. Extrusion drying controls the thickness of the modified asphalt layer, removes excess solvent or moisture, promotes rapid film formation, and improves production efficiency. Finally, an isolation layer is laid on the surface of the modified asphalt layer, protecting the coating from contamination and damage during preparation, transportation, and storage, and facilitating installation during construction. The entire process is simple and efficient, requiring no complex equipment, suitable for continuous industrial production, and fully leverages the performance advantages of environmentally friendly modified asphalt, ensuring the final product combines environmental friendliness, reliability, and durability.

[0076] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments. Unless otherwise specified, specific techniques or conditions in the embodiments are conventional methods, which can be performed according to the techniques or conditions described in the literature in this field or according to the product instructions. It should be noted that, unless otherwise specified, the methods provided in this disclosure are conventional methods, and the reactants and reagents can be obtained from publicly available commercial sources unless otherwise specified.

[0077] Example 1:

[0078] This embodiment provides an environmentally friendly modified asphalt 1, which is prepared by the following composition:

[0079] Base asphalt A: 30 parts of 70# asphalt;

[0080] Base Asphalt B: 20 ​​parts of waterproof 200# asphalt;

[0081] Modifiers: 4 parts styrene-butadiene-styrene block copolymer (SBS), 2 parts styrene-butadiene rubber (SBR);

[0082] Polyolefin thermoplastic elastomer: 2 parts of amorphous α-olefin copolymer (APAO);

[0083] Tackifying resin: 3 parts C9 petroleum resin;

[0084] Nano-activated catalyst: 2 parts of mesoporous silica supported on iron oxide;

[0085] Organic peroxide initiator: 1 part diethylpropylbenzene peroxide;

[0086] Bio-based grafting agent containing epoxy groups: 0.3 parts of epoxidized cashew ether;

[0087] Plant-based softener: 5 parts of environmentally friendly vegetable oil;

[0088] Rubber powder: 30 parts of 60-mesh tire rubber powder;

[0089] Filler: 22 parts of 200-mesh talc powder;

[0090] Rubber activator: 0.5 parts of alkylphenol polysulfide compound 590.

[0091] A method for preparing environmentally friendly modified asphalt 1 includes:

[0092] Base asphalt A and base asphalt B are heated to melt, and modifiers, polyolefin thermoplastic elastomers, and tackifying resins are added. Colloidal grinding is carried out while the temperature is raised simultaneously.

[0093] When the temperature reaches 155~160℃, add adhesive powder and plant-based softener, and keep the colloidal grinding state to carry out pre-swelling and pre-activation reaction.

[0094] When the temperature reaches 165~170℃, add rubber activator and nano-activation catalyst, continue colloidal grinding and stir and heat at the first stirring frequency to activate the rubber molecular chain bond breaking and form activated rubber free radicals.

[0095] When the temperature reaches 170~175℃, add a bio-based grafting agent containing epoxy groups, maintain colloid grinding and stir and heat at the second stirring frequency, so that the bio-based grafting agent containing epoxy groups reacts with the activated rubber free radicals.

[0096] When the temperature reaches 180~190℃, add the organic peroxide initiator, turn off the colloid mill, and stir to cure at the second stirring frequency.

[0097] Maintain the temperature at 180~190℃, add filler and stir to obtain modified asphalt 1.

[0098] Example 2:

[0099] This embodiment provides an environmentally friendly modified asphalt 2, which is prepared by the following composition:

[0100] Base asphalt A: 20 parts of 90# asphalt;

[0101] Base asphalt B: 30 parts of 200# asphalt;

[0102] Modifiers: 3 parts styrene-butadiene-styrene block copolymer (SBS), 2 parts styrene-butadiene rubber (SBR);

[0103] Polyolefin thermoplastic elastomer: 2 parts of amorphous α-olefin copolymer (APAO);

[0104] Tackifying resin: 3 parts C9 petroleum resin;

[0105] Nano-activated catalyst: 3 parts of mesoporous silica supported on iron oxide;

[0106] Organic peroxide initiator: 2 parts diethylpropylbenzene peroxide;

[0107] Bio-based grafting agent containing epoxy groups: 0.4 parts of epoxidized cashew ether;

[0108] Plant-based softener: 5 parts of environmentally friendly vegetable oil;

[0109] Rubber powder: 30 parts of 80-mesh tire rubber powder;

[0110] Filler: 20 parts of 200-mesh light calcium carbonate;

[0111] Rubber activator: Alkylphenol polysulfide compound 560 0.4 parts.

[0112] The method for preparing environmentally friendly modified asphalt 2 is the same as in Example 1, and modified asphalt 2 is obtained.

[0113] Example 3:

[0114] This embodiment provides an environmentally friendly modified asphalt 3, which is prepared by the following composition:

[0115] Base asphalt A: 23 parts of 70# asphalt;

[0116] Base asphalt B: 26 parts of 200# asphalt;

[0117] Modifiers: 2 parts styrene-butadiene-styrene block copolymer (SBS), 3 parts styrene-butadiene rubber (SBR);

[0118] Polyolefin thermoplastic elastomer: 2 parts of amorphous α-olefin copolymer (APAO);

[0119] Tackifying resin: 3 parts C9 petroleum resin;

[0120] Nano-activated catalyst: 1 part of mesoporous silica supported on iron oxide;

[0121] Organic peroxide initiator: 2 parts diethylpropylbenzene peroxide;

[0122] Bio-based grafting agent containing epoxy groups: 0.5 parts of epoxidized cashew phenol ether;

[0123] Plant-based softener: 6 parts of environmentally friendly vegetable oil;

[0124] Rubber powder: 20 parts of 60-mesh tire rubber powder;

[0125] Filler: 27 parts of 200-mesh talc powder;

[0126] Rubber activator: 0.3 parts of alkylphenol polysulfide compound 490.

[0127] The method for preparing environmentally friendly modified asphalt 3 is the same as in Example 1, and modified asphalt 3 is obtained.

[0128] Example 4:

[0129] This embodiment provides an environmentally friendly modified asphalt 4, which is prepared by the following composition:

[0130] Base asphalt A: 30 parts of 90# asphalt;

[0131] Base asphalt B: 25 parts of 200# asphalt;

[0132] Modifiers: 2 parts styrene-butadiene-styrene block copolymer (SBS), 3 parts styrene-butadiene rubber (SBR);

[0133] Polyolefin thermoplastic elastomer: 2 parts of amorphous α-olefin copolymer (APAO);

[0134] Tackifying resin: 2 parts C9 petroleum resin;

[0135] Nano-activated catalyst: 1 part of mesoporous silica supported on iron oxide;

[0136] Organic peroxide initiator: 1 part diethylpropylbenzene peroxide;

[0137] Bio-based grafting agent containing epoxy groups: 0.3 parts of epoxidized cashew ether;

[0138] Plant-based softener: 8 parts of environmentally friendly vegetable oil;

[0139] Rubber powder: 23 parts of 40-mesh tire rubber powder;

[0140] Filler: 30 parts of 200-mesh talc powder;

[0141] Rubber activator: Alkylphenol polysulfide compound 460 0.4 parts.

[0142] The method for preparing environmentally friendly modified asphalt 4 is the same as in Example 1, and modified asphalt 4 is obtained.

[0143] Comparative Example 1:

[0144] This comparative example provides a modified bitumen D1. The composition for preparing modified bitumen D1, compared to Example 1, does not include the epoxy-based bio-based grafting agent epoxidized cashew ether. The remaining components and the method for preparing modified bitumen D1 are the same as in Example 1.

[0145] Comparative Example 2:

[0146] This comparative example provides a modified asphalt D2. The composition for preparing modified asphalt D2, compared to Example 2, does not include the organic peroxide initiator diethylpropylbenzene oxide. The remaining components and the method for preparing modified asphalt D2 are the same as in Example 2.

[0147] Comparative Example 3:

[0148] This comparative example provides a modified asphalt D3. The composition for preparing modified asphalt D3, compared to Example 3, does not include a rubber-free activator, and the rubber powder content is 10 parts. The remaining components and the method for preparing modified asphalt D3 are the same as in Example 3.

[0149] Comparative Example 4:

[0150] This comparative example provides a modified asphalt D4. The composition for preparing modified asphalt D4 does not include mesoporous silica with iron oxide supported by nano-activated catalyst compared to Example 4. The preparation method differs from Example 4 in that: when the temperature reaches 185~190℃, epoxidized cashew phenol ether is added, colloidal grinding is maintained and the temperature is increased by stirring at the second stirring frequency, so that the bio-based grafting agent containing epoxy groups undergoes a grafting reaction with the activated rubber free radicals.

[0151] Maintain the temperature constant for 30 minutes, add the organic peroxide initiator, turn off the colloid mill, and stir at the second stirring frequency to cure;

[0152] Maintain the temperature, add filler and stir to obtain modified asphalt D4.

[0153] The remaining components and the method for preparing modified asphalt D4 are the same as in Example 4.

[0154] Table 1 compares the performance of modified asphalt in Examples 1-4 and Comparative Examples 1-4 of this disclosure.

[0155] Table 1

[0156]

[0157] As shown in Table 1, the modified rubber asphalt in Comparative Example 1, compared with Example 1, showed a significant decrease in activation efficiency without the addition of epoxidized cashew ether grafting agent. Compared to the modified asphalt in Example 1, the viscosity increased by 60 dPas, the production time was extended by 1 hour, and the segregation temperature difference increased by 3°C. The absence of grafting agent prevented the activated rubber free radicals from being stabilized through the grafting reaction. The free radicals easily recombinated, hindering the continued activation reaction and reducing activation efficiency. According to the principle of dynamic equilibrium, the accumulation of ungrafted free radicals inhibits further breakage of rubber molecular chains by the activator, leading to increased system viscosity, increased production time, and decreased compatibility between rubber and asphalt, resulting in intensified segregation. This indicates that the grafting agent, through grafting reaction with activated free radicals, can reduce the proportion of free radicals, disrupt the equilibrium, and accelerate the activation effect of the activator.

[0158] Compared to Example 2, Comparative Example 2 did not include an organic peroxide initiator. Compared to the modified asphalt in Example 2, the kinematic viscosity decreased by 60 dPas, the heat resistance limit decreased by 10°C, and the segregation temperature difference increased by 2.7°C. The initiator can promote the curing reaction between the grafted activated free radicals and the carboxyl groups in the asphalt resin. Without an initiator, the grafting reaction continues to accelerate, leading to a decrease in viscosity, but lacking subsequent curing reactions, the bonding stability between rubber and asphalt is insufficient, and the overall system's heat resistance and anti-segregation ability are significantly reduced, confirming the role of the initiator in the "reaction curing" stage.

[0159] Compared to Example 3, Comparative Example 3 did not contain a rubber activator. Compared to the modified asphalt in Example 3, due to the lack of activation, the amount of rubber powder added decreased from 20 parts to 10 parts, resulting in a 19°C reduction in the heat resistance limit, a 4°C decrease in the low-temperature flexibility temperature, and a 1.6°C increase in the segregation temperature difference. The rubber activator is the main component responsible for breaking rubber molecular chains and generating free radicals. Without a rubber activator, the rubber powder cannot be effectively activated and can only physically swell, limiting the amount of rubber powder that can be added to the asphalt. Simultaneously, the unactivated rubber powder cannot form an effective bond with the asphalt, leading to a significant decrease in high-temperature heat resistance, low-temperature flexibility, and overall stability.

[0160] Compared to Example 4, Comparative Example 4 did not include a nano-activating catalyst. Compared to the modified asphalt in Example 4, the production time was extended by 1 hour, and the activation efficiency decreased significantly, requiring a higher temperature (185-190°C) and a longer reaction time to complete activation. The nano-activating catalyst accelerates the bond-breaking reaction through the ferric ions within it and inhibits free radical binding by adsorbing free sulfur through its porous structure. The absence of the nano-activating catalyst slows down the activation reaction rate, requiring higher temperatures and longer reaction times to achieve similar effects.

[0161] Comparative Example 5

[0162] A modified bitumen D5 is provided in this comparative example, which is prepared by the following composition:

[0163] Base asphalt A: 25 parts of 70# asphalt;

[0164] Base asphalt B: 25 parts of 200# asphalt;

[0165] Modifier: 2 parts SBS;

[0166] Tackifying resin: 3 parts of C9 petroleum resin;

[0167] Rubber powder: 12 parts of 60-mesh tire rubber powder;

[0168] Filler: 200 parts talc powder;

[0169] Rubber activator: 0.3 parts of alkylphenol polysulfide compound 590.

[0170] The method for preparing modified asphalt D5 is a linear activation method, including:

[0171] Mix base asphalt A and base asphalt B and heat to 140℃;

[0172] Add polyolefin thermoplastic elastomer and tackifying resin, stir and grind until no particles are present, and heat to 180℃;

[0173] Add rubber powder and rubber activator, and grind and stir at a temperature of 180~190℃ for more than 2 hours;

[0174] Add filler and stir until homogeneous to obtain modified asphalt D5.

[0175] Comparative Example 6

[0176] A modified bitumen D6 is provided in this comparative example, which is prepared by the following composition:

[0177] Base asphalt A: 30 parts of 70# asphalt;

[0178] Base asphalt B: 20 ​​parts of 200# asphalt;

[0179] Modifier: 3 parts SBS;

[0180] Modifier: 1 part SBR

[0181] Polyolefin thermoplastic elastomers: APAO 4 parts;

[0182] Tackifying resin: 3 parts C9 petroleum resin;

[0183] Filler: 30 parts of 200-mesh light calcium carbonate;

[0184] The cost of purchasing 10-15 parts of the finished activated adhesive powder is borne by the upstream manufacturer, and the cost of the equipment and energy consumption will increase by at least 1,500 yuan / ton.

[0185] The method for preparing modified asphalt D6 is a pretreatment method, including:

[0186] Mix base asphalt A and base asphalt B and heat to 140℃;

[0187] Add polyolefin thermoplastic elastomer and tackifying resin, stir and grind until no particles are present, and heat to 180℃;

[0188] Add the finished activated adhesive powder and grind and stir at 180~190℃ for 30min~60min;

[0189] Add filler and stir until homogeneous to obtain modified asphalt D6.

[0190] Comparative Example 7

[0191] A modified bitumen D7 is provided in comparison, which is prepared by the following composition:

[0192] Base asphalt A: 20 parts of 70# asphalt;

[0193] Base asphalt B: 29 parts of 200# asphalt;

[0194] Rubber powder: 15 parts of 40-mesh tire rubber powder;

[0195] Filler: 30 parts of 200-mesh heavy calcium carbonate;

[0196] Polyolefin thermoplastic elastomer: APAO 2 parts;

[0197] Tackifying resin: 2 parts C9 petroleum resin;

[0198] Rubber activator: 0.4 parts of alkylphenol polysulfide compound 590;

[0199] Pre-treatment adhesive powder: 15 parts.

[0200] Methods for preparing modified asphalt D7, taking screw extrusion activation method as an example, include:

[0201] The base asphalt B, pretreated rubber powder, and rubber activator were premixed at 80°C and then dispersed in a high-speed rubber plasticizer to obtain a pre-prepared sample.

[0202] The pre-prepared sample was added to a screw extruder for shear extrusion at a shear temperature of 230~290℃ and an extruder speed of not less than 150r / min to prepare activated rubber modified asphalt.

[0203] The base asphalt A was mixed and ground with polyolefin thermoplastic elastomer and tackifying resin until no particles were present, and the temperature was maintained at 170℃~190℃ to prepare styrene-butadiene-styrene block copolymer (SBS) modified asphalt.

[0204] The activated rubber modified asphalt and SBS modified asphalt were dispersed and mixed evenly, and filler was added and stirred until uniform to obtain modified asphalt D7.

[0205] Table 2 compares the different preparation methods in Example 1 and Comparative Examples 5-7 of this disclosure.

[0206] Table 2

[0207]

[0208] As shown in Table 2, the preparation method of this disclosure achieves gradient activation by controlling the temperature gradient and stepwise feeding, without the need for additional specialized equipment (such as high-speed shearing machines, twin-screw extruders, etc.). The reaction can be completed using only the stirring, grinding, and temperature control devices of a traditional production line. Therefore, the production process does not need to be interrupted or modified, and the production efficiency is comparable to traditional processes such as pretreatment methods, with no negative impact.

[0209] Linear activation is a linear dynamic reaction with a reaction limit. That is, during the activation reaction, the bond breaking of rubber molecules, the generation of free radicals, and subsequent reactions proceed linearly, making it difficult to break through the upper limit of activation efficiency through dynamic equilibrium or stepwise control. It may be necessary to use equipment such as a high-speed shearing machine to provide physical mechanical force to assist activation. Furthermore, due to the poor activation effect, a long reaction time is required. Even with the purchase of finished activated rubber powder for pretreatment, the overall solubility of most activated rubber powders remains low, and the overall addition amount cannot exceed 15 parts.

[0210] This disclosure optimizes the component formulation and preparation method of environmentally friendly modified asphalt, achieving deep activation of rubber powder through gradient reaction design within conventional equipment, while significantly reducing consumption levels. This provides a new environmentally friendly manufacturing path for building waterproofing materials. Furthermore, this disclosure utilizes a bifunctional activator system that synergistically combines a rubber activator, a nano-activating catalyst, an organic peroxide initiator, and an epoxy-containing bio-based grafting agent. This system enables waste tire rubber powder to simultaneously undergo activation and interface enhancement within the asphalt, resolving the stability issue of sulfur-depleting free radicals and improving the overall stability of the formulation system. This not only simplifies the production process and reduces costs but also significantly improves product performance and environmental friendliness.

[0211] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A composition for preparing environmentally friendly modified asphalt, characterized in that, The composition comprises: Base asphalt A, base asphalt B, rubber powder, filler, modifier, polyolefin thermoplastic elastomer, tackifying resin, rubber activator, nano-activated catalyst, organic peroxide initiator, bio-based grafting agent containing epoxy groups, plant-based softener.

2. The composition according to claim 1, characterized in that, The rubber activator includes any one of tert-butylphenol compounds, alkylphenol polysulfides, thiols, and cashew phenol condensates; The nano-activated catalyst comprises mesoporous silica loaded with iron oxide, wherein the pore size of the mesoporous silica is 5-12 nm, and the loading of iron oxide is not less than 20%; The organic peroxide initiator includes diethylpropylbenzene peroxide; The bio-based grafting agent containing epoxy groups includes epoxidized cashew ether, wherein the epoxy value of the epoxidized cashew ether is 0.2~0.4 mol / 100g.

3. The composition according to claim 1, characterized in that, The components in the composition, by weight, include: Base bitumen A: 20-30 parts; Base asphalt B, 20-30 parts; 20-30 parts of adhesive powder; 20-30 parts of filler; 4-6 parts of modifier; 1-2 parts of polyolefin thermoplastic elastomer; 2-3 parts of tackifying resin; 5-8 parts of plant-based softener; 1-3 parts of nano-activated catalyst; 1-2 parts of organic peroxide initiator; 0.3-5 parts of a bio-based grafting agent containing epoxy groups; Rubber activator 0.3~0.5 parts.

4. The composition according to claim 3, characterized in that, The base bitumen A includes any one or more base bitumens from No. 70 to No. 130; The base bitum B includes any one or more base bitums from No. 180 to No. 220; The rubber powder includes tire rubber powder, and the ash content of the rubber powder is less than 15%. The filler includes at least one of talc, fly ash, light calcium carbonate, and heavy calcium carbonate; The modifiers include styrene-butadiene-styrene block copolymers and styrene-butadiene rubber; The polyolefin thermoplastic elastomers include amorphous α-olefin copolymers; The tackifying resin includes any one of C9 hydrogenated petroleum resins; The plant-based softener includes any one of the plant-based softening oils.

5. A method for preparing environmentally friendly modified asphalt, characterized in that, The method includes: Base asphalt A and base asphalt B are heated to melt, and modifiers, polyolefin thermoplastic elastomers, and tackifying resins are added. Colloidal grinding is carried out while the temperature is raised simultaneously. When the temperature reaches 155~160℃, add adhesive powder and plant-based softener, and keep the colloidal grinding state to carry out pre-swelling and pre-activation reaction. When the temperature reaches 165~170℃, add rubber activator and nano-activation catalyst, continue colloidal grinding and stir and heat at the first stirring frequency to activate the rubber molecular chain bond breaking and form activated rubber free radicals. When the temperature reaches 170~175℃, add a bio-based grafting agent containing epoxy groups, maintain colloid grinding and stir and heat at the second stirring frequency, so that the bio-based grafting agent containing epoxy groups reacts with the activated rubber free radicals. When the temperature reaches 180~190℃, add the organic peroxide initiator, turn off the colloid mill, and stir to cure at the second stirring frequency. Maintain the temperature at 180~190℃, add filler and stir to obtain the environmentally friendly modified asphalt.

6. The method according to claim 5, characterized in that, The heating rate is 10~15℃ / h; The power of the colloid mill is 200~300kw·h; The first stirring frequency is 40~60Hz; The second stirring frequency is 5~20Hz.

7. An environmentally friendly modified bitumen waterproof membrane, characterized in that, The environmentally friendly modified bitumen waterproof membrane includes: The layers stacked from bottom to top are: a lower isolation layer, a lower modified asphalt layer, a base course, an upper modified asphalt layer, and an upper isolation layer. The upper modified asphalt layer and the lower modified asphalt layer are prepared by drying the environmentally friendly modified asphalt obtained by the method described in any one of claims 5 to 6 into a film.

8. The environmentally friendly modified bitumen waterproof membrane according to claim 7, characterized in that, The first isolation layer includes any one of polyethylene film, shale, fine sand, fluorocarbon film, and aluminum film; The second isolation layer includes either a polyethylene film or fine sand. The base layer includes any one of polyester base, glass fiber base, polyester glass fiber base, and copper base.

9. The environmentally friendly modified bitumen waterproof membrane according to claim 8, characterized in that, The thickness of the base layer is 0.9~1.5mm; The thickness of the lower modified asphalt layer is greater than 1 mm.

10. A method for preparing the environmentally friendly modified bitumen waterproof membrane according to any one of claims 7 to 9, characterized in that, The preparation method includes: The base layer is impregnated with pre-impregnated oil to obtain the impregnated base layer; The environmentally friendly modified asphalt is applied to both the top and bottom of the impregnated base layer, and then squeezed and dried to obtain a lower modified asphalt layer and an upper modified asphalt layer. A lower isolation layer and an upper isolation layer are respectively laid on the surfaces of the lower modified asphalt layer and the upper modified asphalt layer to form the environmentally friendly modified asphalt waterproof membrane.

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