Preparation method of modified asphalt waterproof coiled material

Abstract

The invention belongs to the technical field of waterproof coiled materials, and particularly relates to a preparation method of a modified asphalt waterproof coiled material, which aims at solving the problems of poor heat resistance, limited waterproof performance and limited tensile property in the prior art, and adopts the scheme that the preparation method comprises the following steps: S1, the modified asphalt waterproof coiled material consists of a bottom PET (Polyethylene Terephthalate) composite matrix, a middle asphalt layer and a top PE (Polyethylene) film, the asphalt layer comprises the following raw material components in parts by weight: 40-44 parts of asphalt, 36-40 parts of modified nano calcium carbonate, 2-6 parts of softening oil, 3-7 parts of modified SBS and 9-13 parts of combined filler, a cross-linked network of the modified SBS and a rigid support of the modified nano calcium carbonate enable the material to maintain high strength at high temperature, and the ageing resistance of a nano material and a compact structure act together, so that the anti-aging performance of the material is improved. The viscosity of the asphalt is reduced by adding the softening oil, so that the construction is convenient, and meanwhile, the tensile strength and the heat resistance of the asphalt are not sacrificed.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, and in particular to a method for preparing a modified bitumen waterproof membrane. Background Technology

[0002] Chinese patent application number 202111506683.4 discloses a method for preparing wet-laid bitumen waterproof membrane, comprising: step S1, a heating and grinding module heats and grinds the raw materials of the waterproof membrane and outputs them to the impregnation module after completion; step S2, the impregnation module impregnates the mixture input from the heating module to the heating and grinding module until a base layer is obtained and outputs it to the coating module; step S3, the coating module coats the input base layer to obtain the waterproof membrane and conveys it to the cooling module; step S4, the cooling module cools the coated waterproof membrane and outputs it to the winding module for winding. In this invention, during the winding process, a central control module controls a vision detection device to detect the winding tightness of the bitumen waterproof membrane on the surface of the winding device and adjusts the extension and retraction of the docking device on the winding device according to the detection results to adjust the height of the winding device to a corresponding value.

[0003] However, the preparation method of this wet-laying asphalt waterproof membrane also has some problems. For example, the waterproof membrane has poor heat resistance, and the asphalt is prone to problems such as sliding, flowing, dripping, and concentrated air bubbles. Moreover, under certain pressure, the waterproof membrane is prone to leakage, and its tensile properties are limited, affecting the use of the waterproof membrane. Summary of the Invention

[0004] Based on the problems of poor heat resistance, limited waterproof performance, and limited tensile properties in the background technology, this invention proposes a method for preparing modified bitumen waterproof membrane.

[0005] The present invention proposes a method for preparing a modified bitumen waterproof membrane, comprising the following steps:

[0006] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer includes the following raw material components by weight: 40-44 parts bitumen, 36-40 parts modified nano-calcium carbonate, 2-6 parts softening oil, 3-7 parts modified SBS, and 9-13 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite.

[0007] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0008] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0009] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1 to 2 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0010] S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃.

[0011] S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered and cured with a PE film to obtain the modified asphalt waterproof membrane. The cross-linking network of modified SBS and the rigid support of modified nano-calcium carbonate enable the material to maintain high strength at high temperatures. The anti-aging properties and dense structure of the nanomaterials work together to keep the waterproof layer with low permeability during long-term use. The addition of softening oil reduces the viscosity of the asphalt, making it easier to construct, without sacrificing its tensile strength and heat resistance.

[0012] Preferably, in step S1, the weight ratio of the modified nano-calcium carbonate raw material, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of the nano-calcium carbonate is controlled at 80±10nm. Anhydrous ethanol is used as the reaction medium to facilitate subsequent modification operations.

[0013] Preferably, in step S1, the preparation method of modified nano-calcium carbonate is as follows: Nano-calcium carbonate, phosphate surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol, and zinc stearate are weighed according to the specified ratio. The nano-calcium carbonate is placed in a high-speed dispersion vessel. Anhydrous ethanol is added at a solid-liquid ratio of 1:4. The ultrasonic processor is started at 800W, and ultrasonic dispersion is performed for 30 minutes, pausing for 2 minutes every 10 minutes to prevent overheating and break hydrogen-bonded aggregates. The temperature is maintained at 40℃±2℃, and mechanical stirring is performed at 500r / min. Ammonia is added dropwise to adjust the pH to 8.5-9.0 to activate the -OH groups on the surface of the nano-calcium carbonate. A wet dispersion is then performed. A chemical coating method was used, in which phosphate ester surface treatment agent and zirconate ester coupling agent were slowly added, and the stirring rate was controlled at 600 r / min. The nano-cerium oxide sol was loaded into a pressure spray can and atomized into a fluidized bed through a two-fluid nozzle. The nano-cerium oxide sol was directionally deposited on the surface of nano-calcium carbonate to form an island structure. The temperature was programmed to 180℃ at a rate of 5℃ / min, and nitrogen gas with a purity >99.99% was introduced at a flow rate of 15 L / min. The temperature was maintained for 60 min, and dehydration and condensation were carried out to form a continuous network. The mixture was cooled to 60℃, and zinc stearate was added and mixed at high speed to obtain modified nano-calcium carbonate. This method can be used to modify nano-calcium carbonate.

[0014] Preferably, in step S1, the weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS is YH-802 star-shaped, and the particle size of the aminated nano-silica is 15nm, which can ensure the performance of SBS and increase its compatibility with asphalt.

[0015] Preferably, in S1, the modified SBS is prepared by weighing SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate according to the following proportions. After drying, the SBS is introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, maleic anhydride is injected, the temperature of the grafting reaction section is 190°C, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added to the side feed port, and finally, after extrusion, it is water-cooled and pelletized, which can preferentially modify SBS.

[0016] Preferably, in step S1, the weight ratio of rubber powder, modified basalt short fiber and organic bentonite in the combined filler is controlled at 9:1:2, and the rubber powder is made from waste tire tread rubber powder, which is beneficial for waste recycling.

[0017] Preferably, in step S1, the raw materials for modifying basalt short fibers include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6 mm, and the silane coupling agent selected is KH-560, which can ensure the thermal stability of the roll material and increase its mechanical strength.

[0018] Preferably, in step S1, the modification of basalt short fibers involves: immersing basalt fibers in a 5% sodium hydroxide solution, treating at 80°C for 20 minutes, rinsing with deionized water until neutral, and drying at 105°C for later use; mixing anhydrous ethanol and glacial acetic acid, adding basalt short fibers and a silane coupling agent, ultrasonically treating at 60°C for 30 minutes, then maintaining at 70°C for 2 hours, and drying for later use; dissolving epoxy resin and C5 petroleum resin in anhydrous ethanol, immersing the dried basalt short fibers, ultrasonically treating for 20 minutes, slowly stirring at 80°C, evaporating the solvent until a matte coating forms on the surface of the basalt short fibers, curing at 120°C for 30 minutes, and finally removing agglomerates using a 40-mesh sieve to obtain modified basalt short fibers. After modification, the basalt short fibers can increase their compatibility with asphalt and enhance their adhesion.

[0019] Preferably, in S1, the asphalt is 90# base asphalt, and the softening oil is one of naphthenic oil and plant-derived oil, which can ensure the performance of the asphalt.

[0020] Preferably, in step S6, after the PE film is attached, it is calendered using a three-roll calender with pressure controlled at 8MPa and speed controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours. Calendering can increase the density of the waterproof membrane and improve its performance.

[0021] The beneficial effects of this invention are:

[0022] 1. Improved high-temperature stability of modified SBS

[0023] Modified SBS grafted with maleic anhydride and cross-linked with sulfur forms a three-dimensional network structure, which significantly improves the softening point of asphalt. Modified nano-calcium carbonate forms a strong interfacial bond with asphalt through surface treatment, forming a physical barrier that inhibits the aggregation and flow of asphalt molecules at high temperatures, thus delaying the thermo-oxidative aging of asphalt and further improving its long-term heat resistance.

[0024] 2. The ultrafine particles of modified nano-calcium carbonate and organic bentonite fill the internal pores of asphalt, forming a continuous and dense waterproof layer. The high elasticity of modified SBS and the flexibility of rubber powder enable the asphalt layer to adapt to the expansion and contraction of the base layer, avoiding leakage caused by cracking. The antioxidant effect of nano-cerium oxide sol and aminated nano-silica can inhibit the photo-oxidative aging of asphalt and extend the service life of the waterproof layer.

[0025] 3. The elastic network formed by modified SBS and the rigid particles of aminated nano-silica work synergistically to significantly improve the tensile strength of the asphalt layer. The rubber powder in the composite filler provides flexibility, the modified basalt short fibers provide rigidity, and the organic bentonite regulates the rheological properties, forming a multi-scale reinforcing network.

[0026] The cross-linked network of modified SBS and the rigid support of modified nano-calcium carbonate enable the material to maintain high strength at high temperatures. The anti-aging properties and dense structure of the nanomaterials work together to maintain low permeability of the waterproof layer during long-term use. The addition of softening oil reduces the viscosity of the asphalt, making it easier to apply, without sacrificing its tensile strength and heat resistance. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the workflow proposed in this invention. Detailed Implementation

[0028] The present invention will be further explained below with reference to specific embodiments.

[0029] Reference Figure 1 Example 1

[0030] This embodiment proposes a method for preparing modified bitumen waterproof membrane, including the following steps:

[0031] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer comprises the following raw material components by weight: 42 parts bitumen, 37 parts modified nano-calcium carbonate, 5 parts softening oil, 5 parts modified SBS, and 11 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. The weight ratio of modified nano-calcium carbonate raw materials, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of nano-calcium carbonate is controlled at 85nm. Anhydrous ethanol is... Preparation method of modified nano-calcium carbonate reaction medium: Weigh nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol and zinc stearate according to the ratio. Place nano-calcium carbonate in a high-speed dispersion vessel, add anhydrous ethanol at a solid-liquid ratio of 1:4, start the ultrasonic processor at 800W, ultrasonically disperse for 30min, pause for 2min every 10min to prevent overheating and break hydrogen bond aggregates, maintain the temperature at 40℃, mechanically stir at 500r / min, add ammonia water dropwise to adjust pH to 8.8 to activate the -OH groups on the surface of nano-calcium carbonate, use wet chemical coating method, slowly add phosphate ester surface treatment agent and zirconate ester coupling agent, control the stirring rate at 600r / min, put nano-cerium oxide sol into a pressure spray can, atomize and spray into a fluidized bed through a two-fluid nozzle, nano-cerium oxide sol is directionally deposited on the surface of nano-calcium carbonate to form island structure, program the temperature to 180℃, rate 5℃ / min, and introduce purity >99%.99% nitrogen gas, flow rate 15 L / min, heat treatment for 60 min, dehydration condensation into a continuous network, cooling to 60℃, adding zinc stearate, high-speed mixing, finally obtaining modified nano-calcium carbonate. The weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS adopts YH-802 star shape, and the particle size of aminated nano-silica is 15 nm. The preparation method of modified SBS is as follows: weigh SBS, ... Maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate, after being dried with SBS, are introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, and maleic anhydride is injected. The temperature of the grafting reaction section is 190°C, and dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added through the side feed. After extrusion, the mixture is water-cooled and pelletized. The weight ratio of rubber powder, modified basalt short fibers, and organobentonite in the composite filler is controlled at 9:1:2. The rubber powder used is waste tire tread rubber powder, and the modified basalt short fibers... The raw materials for fiber modification include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6mm. KH-560 silane coupling agent is selected to ensure the mechanical and thermal stability of the roll material. The modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80℃ for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105℃ for later use. Anhydrous ethanol and glacial acetic acid are mixed, and then the basalt short fibers and silane coupling agent are added. The agent was ultrasonically treated at 60℃ for 30 minutes, then kept at 70℃ for 2 hours, and dried for later use. Epoxy resin and C5 petroleum resin were dissolved in anhydrous ethanol and impregnated into the dried basalt short fibers. The fibers were ultrasonically treated for 20 minutes, then slowly stirred at 80℃ to evaporate the solvent until a matte coating formed on the surface of the basalt short fibers. The fibers were cured at 120℃ for 30 minutes. Finally, agglomerates were removed using a 40-mesh sieve to obtain modified basalt short fibers. 90# base asphalt was used, and the softening oil was either naphthenic oil or plant-derived oil.

[0032] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0033] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0034] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1.5 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0035] S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃.

[0036] S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered with PE film. After the PE film is attached, it is calendered using a three-roll calender. The pressure is controlled at 8MPa and the speed is controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours to cure and obtain the modified asphalt waterproof membrane.

[0037] Reference Figure 1 Example 2

[0038] This embodiment proposes a method for preparing modified bitumen waterproof membrane, including the following steps:

[0039] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer comprises the following raw material components by weight: 42 parts bitumen, 38 parts modified nano-calcium carbonate, 4 parts softening oil, 5 parts modified SBS, and 11 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. The weight ratio of modified nano-calcium carbonate raw materials, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of nano-calcium carbonate is controlled at 85nm. Anhydrous ethanol is... Preparation method of modified nano-calcium carbonate reaction medium: Weigh nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol and zinc stearate according to the ratio. Place nano-calcium carbonate in a high-speed dispersion vessel, add anhydrous ethanol at a solid-liquid ratio of 1:4, start the ultrasonic processor at 800W, ultrasonically disperse for 30min, pause for 2min every 10min to prevent overheating and break hydrogen bond aggregates, maintain the temperature at 40℃, mechanically stir at 500r / min, add ammonia water dropwise to adjust pH to 8.8 to activate the -OH groups on the surface of nano-calcium carbonate, use wet chemical coating method, slowly add phosphate ester surface treatment agent and zirconate ester coupling agent, control the stirring rate at 600r / min, put nano-cerium oxide sol into a pressure spray can, atomize and spray into a fluidized bed through a two-fluid nozzle, nano-cerium oxide sol is directionally deposited on the surface of nano-calcium carbonate to form island structure, program the temperature to 180℃, rate 5℃ / min, and introduce purity >99%.99% nitrogen gas, flow rate 15 L / min, heat treatment for 60 min, dehydration condensation into a continuous network, cooling to 60℃, adding zinc stearate, high-speed mixing, finally obtaining modified nano-calcium carbonate. The weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS adopts YH-802 star shape, and the particle size of aminated nano-silica is 15 nm. The preparation method of modified SBS is as follows: weigh SBS, ... Maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate, after being dried with SBS, are introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, and maleic anhydride is injected. The temperature of the grafting reaction section is 190°C, and dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added through the side feed. After extrusion, the mixture is water-cooled and pelletized. The weight ratio of rubber powder, modified basalt short fibers, and organobentonite in the composite filler is controlled at 9:1:2. The rubber powder used is waste tire tread rubber powder, and the modified basalt short fibers... The raw materials for fiber modification include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6mm. KH-560 silane coupling agent is selected to ensure the mechanical and thermal stability of the roll material. The modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80℃ for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105℃ for later use. Anhydrous ethanol and glacial acetic acid are mixed, and then the basalt short fibers and silane coupling agent are added. The agent was ultrasonically treated at 60℃ for 30 minutes, then kept at 70℃ for 2 hours, and dried for later use. Epoxy resin and C5 petroleum resin were dissolved in anhydrous ethanol and impregnated into the dried basalt short fibers. The fibers were ultrasonically treated for 20 minutes, then slowly stirred at 80℃ to evaporate the solvent until a matte coating formed on the surface of the basalt short fibers. The fibers were cured at 120℃ for 30 minutes. Finally, agglomerates were removed using a 40-mesh sieve to obtain modified basalt short fibers. 90# base asphalt was used, and the softening oil was either naphthenic oil or plant-derived oil.

[0040] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0041] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0042] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1.5 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0043] S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃.

[0044] S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered with PE film. After the PE film is attached, it is calendered using a three-roll calender. The pressure is controlled at 8MPa and the speed is controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours to cure and obtain the modified asphalt waterproof membrane.

[0045] Reference Figure 1 Example 3

[0046] This embodiment proposes a method for preparing modified bitumen waterproof membrane, including the following steps:

[0047] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer comprises the following raw material components by weight: 42 parts bitumen, 38 parts modified nano-calcium carbonate, 3 parts softening oil, 6 parts modified SBS, and 11 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. The weight ratio of modified nano-calcium carbonate raw materials, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of nano-calcium carbonate is controlled at 85nm. Anhydrous ethanol is... Preparation method of modified nano-calcium carbonate reaction medium: Weigh nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol and zinc stearate according to the ratio. Place nano-calcium carbonate in a high-speed dispersion vessel, add anhydrous ethanol at a solid-liquid ratio of 1:4, start the ultrasonic processor at 800W, ultrasonically disperse for 30min, pause for 2min every 10min to prevent overheating and break hydrogen bond aggregates, maintain the temperature at 40℃, mechanically stir at 500r / min, add ammonia water dropwise to adjust pH to 8.8 to activate the -OH groups on the surface of nano-calcium carbonate, use wet chemical coating method, slowly add phosphate ester surface treatment agent and zirconate ester coupling agent, control the stirring rate at 600r / min, put nano-cerium oxide sol into a pressure spray can, atomize and spray into a fluidized bed through a two-fluid nozzle, nano-cerium oxide sol is directionally deposited on the surface of nano-calcium carbonate to form island structure, program the temperature to 180℃, rate 5℃ / min, and introduce purity >99%.99% nitrogen gas, flow rate 15 L / min, heat treatment for 60 min, dehydration condensation into a continuous network, cooling to 60℃, adding zinc stearate, high-speed mixing, finally obtaining modified nano-calcium carbonate. The weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS adopts YH-802 star shape, and the particle size of aminated nano-silica is 15 nm. The preparation method of modified SBS is as follows: weigh SBS, ... Maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate, after being dried with SBS, are introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, and maleic anhydride is injected. The temperature of the grafting reaction section is 190°C, and dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added through the side feed. After extrusion, the mixture is water-cooled and pelletized. The weight ratio of rubber powder, modified basalt short fibers, and organobentonite in the composite filler is controlled at 9:1:2. The rubber powder used is waste tire tread rubber powder, and the modified basalt short fibers... The raw materials for fiber modification include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6mm. KH-560 silane coupling agent is selected to ensure the mechanical and thermal stability of the roll material. The modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80℃ for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105℃ for later use. Anhydrous ethanol and glacial acetic acid are mixed, and then the basalt short fibers and silane coupling agent are added. The agent was ultrasonically treated at 60℃ for 30 minutes, then kept at 70℃ for 2 hours, and dried for later use. Epoxy resin and C5 petroleum resin were dissolved in anhydrous ethanol and impregnated into the dried basalt short fibers. The fibers were ultrasonically treated for 20 minutes, then slowly stirred at 80℃ to evaporate the solvent until a matte coating formed on the surface of the basalt short fibers. The fibers were cured at 120℃ for 30 minutes. Finally, agglomerates were removed using a 40-mesh sieve to obtain modified basalt short fibers. 90# base asphalt was used, and the softening oil was either naphthenic oil or plant-derived oil.

[0048] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0049] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0050] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1.5 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0051] S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃.

[0052] S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered with PE film. After the PE film is attached, it is calendered using a three-roll calender. The pressure is controlled at 8MPa and the speed is controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours to cure and obtain the modified asphalt waterproof membrane.

[0053] Reference Figure 1 Example 4

[0054] This embodiment proposes a method for preparing modified bitumen waterproof membrane, including the following steps:

[0055] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer comprises the following raw material components by weight: 40 parts bitumen, 39 parts modified nano-calcium carbonate, 5 parts softening oil, 4 parts modified SBS, and 12 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. The weight ratio of modified nano-calcium carbonate raw materials, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of nano-calcium carbonate is controlled at 85nm. Anhydrous ethanol is... Preparation method of modified nano-calcium carbonate reaction medium: Weigh nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol and zinc stearate according to the ratio. Place nano-calcium carbonate in a high-speed dispersion vessel, add anhydrous ethanol at a solid-liquid ratio of 1:4, start the ultrasonic processor at 800W, ultrasonically disperse for 30min, pause for 2min every 10min to prevent overheating and break hydrogen bond aggregates, maintain the temperature at 40℃, mechanically stir at 500r / min, add ammonia water dropwise to adjust pH to 8.8 to activate the -OH groups on the surface of nano-calcium carbonate, use wet chemical coating method, slowly add phosphate ester surface treatment agent and zirconate ester coupling agent, control the stirring rate at 600r / min, put nano-cerium oxide sol into a pressure spray can, atomize and spray into a fluidized bed through a two-fluid nozzle, nano-cerium oxide sol is directionally deposited on the surface of nano-calcium carbonate to form island structure, program the temperature to 180℃, rate 5℃ / min, and introduce purity >99%.99% nitrogen gas, flow rate 15 L / min, heat treatment for 60 min, dehydration condensation into a continuous network, cooling to 60℃, adding zinc stearate, high-speed mixing, finally obtaining modified nano-calcium carbonate. The weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS adopts YH-802 star shape, and the particle size of aminated nano-silica is 15 nm. The preparation method of modified SBS is as follows: weigh SBS, ... Maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate, after being dried with SBS, are introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, and maleic anhydride is injected. The temperature of the grafting reaction section is 190°C, and dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added through the side feed. After extrusion, the mixture is water-cooled and pelletized. The weight ratio of rubber powder, modified basalt short fibers, and organobentonite in the composite filler is controlled at 9:1:2. The rubber powder used is waste tire tread rubber powder, and the modified basalt short fibers... The raw materials for fiber modification include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6mm. KH-560 silane coupling agent is selected to ensure the mechanical and thermal stability of the roll material. The modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80℃ for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105℃ for later use. Anhydrous ethanol and glacial acetic acid are mixed, and then the basalt short fibers and silane coupling agent are added. The agent was ultrasonically treated at 60℃ for 30 minutes, then kept at 70℃ for 2 hours, and dried for later use. Epoxy resin and C5 petroleum resin were dissolved in anhydrous ethanol and impregnated into the dried basalt short fibers. The fibers were ultrasonically treated for 20 minutes, then slowly stirred at 80℃ to evaporate the solvent until a matte coating formed on the surface of the basalt short fibers. The fibers were cured at 120℃ for 30 minutes. Finally, agglomerates were removed using a 40-mesh sieve to obtain modified basalt short fibers. 90# base asphalt was used, and the softening oil was either naphthenic oil or plant-derived oil.

[0056] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0057] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0058] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1.5 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0059] S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃.

[0060] S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered with PE film. After the PE film is attached, it is calendered using a three-roll calender. The pressure is controlled at 8MPa and the speed is controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours to cure and obtain the modified asphalt waterproof membrane.

[0061] Reference Figure 1 Example 5

[0062] This embodiment proposes a method for preparing modified bitumen waterproof membrane, including the following steps:

[0063] S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer comprises the following raw material components by weight: 40 parts bitumen, 40 parts modified nano-calcium carbonate, 4 parts softening oil, 3 parts modified SBS, and 13 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. The weight ratio of modified nano-calcium carbonate raw materials, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:1. The particle size of nano-calcium carbonate is controlled at 85nm. Anhydrous ethanol is... Preparation method of modified nano-calcium carbonate reaction medium: Weigh nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol and zinc stearate according to the ratio. Place nano-calcium carbonate in a high-speed dispersion vessel, add anhydrous ethanol at a solid-liquid ratio of 1:4, start the ultrasonic processor at 800W, ultrasonically disperse for 30min, pause for 2min every 10min to prevent overheating and break hydrogen bond aggregates, maintain the temperature at 40℃, mechanically stir at 500r / min, add ammonia water dropwise to adjust pH to 8.8 to activate the -OH groups on the surface of nano-calcium carbonate, use wet chemical coating method, slowly add phosphate ester surface treatment agent and zirconate ester coupling agent, control the stirring rate at 600r / min, put nano-cerium oxide sol into a pressure spray can, atomize and spray into a fluidized bed through a two-fluid nozzle, nano-cerium oxide sol is directionally deposited on the surface of nano-calcium carbonate to form island structure, program the temperature to 180℃, rate 5℃ / min, and introduce purity >99%.99% nitrogen gas, flow rate 15 L / min, heat treatment for 60 min, dehydration condensation into a continuous network, cooling to 60℃, adding zinc stearate, high-speed mixing, finally obtaining modified nano-calcium carbonate. The weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:3. The SBS adopts YH-802 star shape, and the particle size of aminated nano-silica is 15 nm. The preparation method of modified SBS is as follows: weigh SBS, ... Maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate, after being dried with SBS, are introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C, and maleic anhydride is injected. The temperature of the grafting reaction section is 190°C, and dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added through the side feed. After extrusion, the mixture is water-cooled and pelletized. The weight ratio of rubber powder, modified basalt short fibers, and organobentonite in the composite filler is controlled at 9:1:2. The rubber powder used is waste tire tread rubber powder, and the modified basalt short fibers... The raw materials for fiber modification include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6mm. KH-560 silane coupling agent is selected to ensure the mechanical and thermal stability of the roll material. The modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80℃ for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105℃ for later use. Anhydrous ethanol and glacial acetic acid are mixed, and then the basalt short fibers and silane coupling agent are added. The agent was ultrasonically treated at 60℃ for 30 minutes, then kept at 70℃ for 2 hours, and dried for later use. Epoxy resin and C5 petroleum resin were dissolved in anhydrous ethanol and impregnated into the dried basalt short fibers. The fibers were ultrasonically treated for 20 minutes, then slowly stirred at 80℃ to evaporate the solvent until a matte coating formed on the surface of the basalt short fibers. The fibers were cured at 120℃ for 30 minutes. Finally, agglomerates were removed using a 40-mesh sieve to obtain modified basalt short fibers. 90# base asphalt was used, and the softening oil was either naphthenic oil or plant-derived oil.

[0064] S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt;

[0065] S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles.

[0066] S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1.5 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles.

[0067] S5: Slowly add nano calcium carbonate in proportion and complete the addition within 3 minutes. Keep the rotation speed at 1500 r / min, the shearing temperature at 220 °C, and shear for 30 minutes to obtain the asphalt liquid. The asphalt liquid can be discharged after its stability drops to 160 °C.

[0068] S6: Uniformly coat the prepared asphalt liquid on the PET composite base, and finally cover it with a PE film. After attaching the PE film, use a three-roll calender to calender and form it. Control the pressure at 8 MPa and the speed at 2 m / min. After calendering, let it stand in a constant temperature room at 40 °C for 48 hours for curing to obtain the modified asphalt waterproof coil.

[0069] Compare the conventional waterproof coils with the waterproof coils prepared in Examples 1 to 5. The waterproof coils prepared in Examples 1 to 5 are as follows in the table:

[0070] Comparative Example Example 1 Example 2 Example 3 Example 4 Example 5 Heat resistance qualified qualified qualified qualified qualified qualified Softening point / °C 80 94 95 94 93 91 Waterproof qualified qualified qualified qualified qualified qualified Long-term impermeability: Whether it leaks yes no no no no no Maximum tensile force N / 50mm 1150 1260 1300 1270 1250 1240 Maximum elongation % 50 69 70 69 68 68

[0071] The test standard for heat resistance is GB18242 - 2008.

[0072] Heat resistance test method: Take a coil specimen with a size of 100 mm × 50 mm, place it in an oven at 105 ± 2 °C, horizontally place it on a glass plate coated with talcum powder, take it out after heating for 2 h, and observe whether there are phenomena such as flowing, dripping or adhesion on the surface.

[0073] The test standard for waterproofness is GB18242 - 2008.

[0074] Water impermeability test: Specimen size: 150 mm × 150 mm. Use a water impermeability tester. Under the temperature condition of 23 ± 2 °C, apply a pressure of 0.3 MPa and keep it for 30 min, and observe whether there is water seepage. Judgment requirement: No leakage is qualified.

[0075] Long-term water impermeability: After thermal aging (80 °C × 168 h), it can still maintain no water penetration under 0.3 MPa, reflecting the anti-aging synergistic effect of the nano material.

[0076] The test standard for tensile properties is GB18242 - 2008.

[0077] Tensile property test method: Specimen size: (250 - 300) mm × 50 mm. Use a tensile testing machine. The tensile speed is (100 ± 10) mm / min, and measure the maximum tensile force (N / 50 mm) and the maximum elongation rate (%).

[0078] As can be seen from the above table, the heat resistance, waterproofness and tensile properties of the waterproof coils prepared by the present invention have been significantly improved, and Example 2 is the best example.

[0079] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a modified bitumen waterproof membrane, characterized in that, Includes the following steps: S1: Modified bitumen waterproof membrane consists of a bottom PET composite base, a middle bitumen layer, and a top PE film. The bitumen layer includes the following raw material components by weight: 40-44 parts bitumen, 36-40 parts modified nano-calcium carbonate, 2-6 parts softening oil, 3-7 parts modified SBS, and 9-13 parts combined filler. The raw material components of modified nano-calcium carbonate include nano-calcium carbonate, phosphate ester surface treatment agent, zirconate coupling agent, nano-cerium oxide sol, zinc stearate, and anhydrous ethanol. The raw material components of modified SBS include SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate. The raw material components of the combined filler include rubber powder, modified basalt short fibers, and organic bentonite. S2: Weigh out asphalt and softening oil, mix them together, and raise the temperature to 160℃ to melt the asphalt; S3: After the asphalt is completely melted, add modified SBS, keep the material temperature at 180℃, and shear at high speed for 2 hours, with the rotation speed controlled at 1500r / min, until the polymer is melted without obvious particles. S4: Add the combined filler, raise the material temperature to 220℃, and shear at high speed for 1 to 2 hours while maintaining the rotation speed at 1500r / min until the polymer is melted and there are no obvious particles. S5: Add nano calcium carbonate slowly according to the ratio, complete the addition within 3 minutes, keep the rotation speed at 1500 r / min, keep the shearing temperature at 220℃, shear for 30 minutes to obtain asphalt liquid, and discharge the material when the asphalt liquid stabilizes and drops to 160℃. S6: The prepared asphalt liquid is evenly coated onto the PET composite base, and finally covered and cured with PE film to obtain the modified asphalt waterproof membrane.

2. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In step S1, the weight ratio of the modified nano-calcium carbonate raw material, including nano-calcium carbonate, phosphate ester surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol, and zinc stearate, is controlled at 130:2:1:6:

1. The particle size of the nano-calcium carbonate is controlled at 80±10nm, and anhydrous ethanol is used as the reaction medium.

3. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, The preparation method of modified nano-calcium carbonate in S1 is as follows: Nano-calcium carbonate, phosphate surface treatment agent, zirconate ester coupling agent, nano-cerium oxide sol, and zinc stearate are weighed according to the specified ratio. The nano-calcium carbonate is placed in a high-speed dispersion vessel. Anhydrous ethanol is added at a solid-liquid ratio of 1:

4. The ultrasonic processor is started at 800W, and ultrasonic dispersion is performed for 30 minutes, pausing for 2 minutes every 10 minutes to prevent overheating and break hydrogen-bonded aggregates. The temperature is maintained at 40℃±2℃, and mechanical stirring is performed at 500r / min. Ammonia is added dropwise to adjust the pH to 8.5–9.0 to activate the -OH groups on the surface of the nano-calcium carbonate. The modified cerium oxide nanoparticles were prepared by a wet chemical coating method, slowly adding phosphate ester surface treatment agent and zirconate ester coupling agent while stirring at 600 r / min. The nanoparticles were loaded into a pressure spray can and atomized into a fluidized bed through a two-fluid nozzle. The nanoparticles were directionally deposited on the surface of the nano-calcium carbonate to form an island structure. The temperature was programmed to 180℃ at a rate of 5℃ / min, and nitrogen gas with a purity >99.99% was introduced at a flow rate of 15 L / min. The mixture was held at this temperature for 60 min, and the nano-calcium carbonate was dehydrated and condensed into a continuous network. The mixture was then cooled to 60℃, zinc stearate was added, and the mixture was stirred at high speed to obtain the modified nano-calcium carbonate.

4. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In S1, the weight ratio of SBS, maleic anhydride, dicumyl peroxide, aminated nano silica, sulfur, and zinc stearate in the modified SBS is controlled at 300:4:1:24:2:

3. The SBS is YH-802 star-shaped, and the particle size of the aminated nano silica is 15 nm.

5. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, The modified SBS in S1 is prepared as follows: SBS, maleic anhydride, dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are weighed according to the proportion. After drying, the SBS is introduced into the interior of a twin-screw extruder. The temperature of the melting section is 180°C. Maleic anhydride is injected. The temperature of the grafting reaction section is 190°C. Dicumyl peroxide, aminated nano-silica, sulfur, and zinc stearate are added to the side feed port. Finally, after extrusion, the material is water-cooled and pelletized.

6. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In S1, the weight ratio of rubber powder, modified basalt short fiber and organic bentonite in the combined filler is controlled at 9:1:2, and the rubber powder is made from waste automobile tire tread rubber powder.

7. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In step S1, the raw materials for modifying basalt short fibers include basalt short fibers, 5% sodium hydroxide solution, silane coupling agent, epoxy resin, anhydrous ethanol, glacial acetic acid, and C5 petroleum resin. The length of the basalt short fibers is 6 mm, and the silane coupling agent selected is KH-560.

8. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In step S1, the modification steps for basalt short fibers are as follows: basalt fibers are immersed in a 5% sodium hydroxide solution and treated at 80°C for 20 minutes. They are then rinsed with deionized water until neutral and dried at 105°C. Anhydrous ethanol and glacial acetic acid are mixed, and basalt short fibers and a silane coupling agent are added. The mixture is ultrasonically treated at 60°C for 30 minutes, then kept at 70°C for 2 hours and dried. Epoxy resin and C5 petroleum resin are dissolved in anhydrous ethanol and immersed in the dried basalt short fibers. The mixture is ultrasonically treated for 20 minutes and slowly stirred at 80°C to evaporate the solvent until a matte coating forms on the surface of the basalt short fibers. The fibers are then cured at 120°C for 30 minutes and finally, agglomerates are removed using a 40-mesh sieve to obtain the modified basalt short fibers.

9. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In S1, the asphalt is 90# base asphalt, and the softening oil is one of naphthenic oil and plant-derived oil.

10. The method for preparing a modified bitumen waterproof membrane according to claim 1, characterized in that, In step S6, after the PE film is attached, it is calendered using a three-roll calender with pressure controlled at 8MPa and speed controlled at 2m / min. After calendering, it is left to stand in a constant temperature room at 40℃ for 48 hours.

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