Conductive waterproof roll as well as preparation method and application thereof

Abstract

The invention relates to the technical field of building waterproof materials, and discloses a conductive waterproof roll as well as a preparation method and application thereof. The conductive waterproof roll comprises a conductive layer and a waterproof layer, a raw material composition I for forming the conductive layer contains matrix asphalt I, polyisobutene, butadiene styrene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fibers, an additive and a compound modifier A; the compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I in a content mass ratio of 1: (1-2); the content of a styrene structural unit in the thermoplastic rubber SAM-I is 20-30 wt%. Compared with a traditional waterproof roll, the comprehensive performance of the conductive waterproof roll is remarkably improved, and the conductive waterproof roll has the conductive sensing function, the waterproof sealing performance, the weather resistance, the high and low temperature resistance, the corrosion resistance and the flame retardance.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, specifically to a conductive waterproof membrane, its preparation method, and its application. Background Technology

[0002] In the field of building waterproofing, traditional waterproof membranes mainly include SBS modified bitumen membranes, APP modified bitumen membranes, and polymer membranes. The core function of these membranes is to achieve waterproofing through their own isolation properties, and they are in a state of "passive waterproofing" as a whole. They also have significant performance shortcomings: insufficient weather resistance (prone to aging and cracking after long-term exposure), poor resistance to high and low temperature cycles, weak resistance to chemical corrosion, and some membranes do not have flame retardant functions. Even with the addition of a single modifier, it is difficult to meet the long-term weather resistance requirements of complex scenarios, and there are safety hazards in new energy and industrial scenarios.

[0003] There are two main methods for detecting leaks: one is reactive detection, where leaks are detected and repaired only after signs of water seepage appear inside the building; the other is regular manual inspections by professionals who patrol the roof. These traditional methods have significant drawbacks: traditional waterproof membranes lack real-time monitoring capabilities, resulting in delayed leak detection. By the time repairs are completed, the building structure may already be damaged, leading to high repair costs. Regular manual inspections are inefficient, risky, and unable to detect hidden or early-stage leaks.

[0004] In scenarios such as photovoltaic roofs, energy storage power stations, and chemical plant areas, traditional waterproof membranes need to withstand long-term ultraviolet radiation, day and night temperature cycles, and wind and rain erosion. Some also need to come into contact with oils and chemicals, which can easily lead to aging, damage, corrosion and failure. Moreover, leakage detection relies entirely on the above-mentioned traditional methods. Once a problem occurs, it may cause serious accidents such as fires and equipment damage.

[0005] Therefore, there is an urgent need to develop a waterproof membrane that is highly weather-resistant, adaptable to different application scenarios, and has real-time monitoring capabilities. Summary of the Invention

[0006] The purpose of this invention is to provide a conductive waterproof membrane that combines excellent weather resistance, long-term structural stability, and reliable real-time leakage monitoring.

[0007] To achieve the above objectives, a first aspect of the present invention provides a conductive waterproof membrane, the conductive waterproof membrane comprising a conductive layer and a waterproof layer; The raw material composition I forming the conductive layer contains matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fibers, additives, and compound modifier A; the compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I in a mass ratio of 1:1-2; the styrene structural units in the thermoplastic rubber SAM-I contain 20-30 wt%. Based on the total weight of the raw material composition I, the content of the matrix asphalt I is 40-55 wt%, the content of the polyisobutylene is 5-12 wt%, the content of the styrene-butadiene rubber I is 4-8 wt%, the content of the hydrogenated petroleum resin I is 2-5 wt%, the content of SBS-I is 5-10 wt%, the content of the conductive fiber is 8-15 wt%, the content of the additive is 0.6-1.6 wt%, and the content of the compound modifier A is 8-18 wt%. The raw material composition II forming the waterproof layer contains matrix bitumen II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B; the compound modifier B is a combination of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II in a mass ratio of 1:0.5-1; the content of styrene structural units in the thermoplastic rubber SAM-II is 20-30 wt%. Based on the total weight of the raw material composition II, the content of the base asphalt II is 45-55 wt%, the content of the aromatic oil is 8-15 wt%, the content of the styrene-butadiene rubber II is 3-7 wt%, the content of SBS-II is 4-10 wt%, the content of the hydrogenated petroleum resin II is 2-8 wt%, and the content of the compound modifier B is 7-16 wt%.

[0008] A second aspect of the present invention provides a method for preparing the conductive waterproof membrane described in the first aspect, the method comprising: (1) A raw material composition I containing matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fiber, additives, and compound modifier A is first mixed to obtain mixture I; and The raw material composition II, containing matrix asphalt II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B, is mixed a second time to obtain mixture II; (2) The mixture I and the mixture II are coated and molded to obtain the conductive waterproof membrane.

[0009] A third aspect of the present invention provides the application of the conductive waterproof membrane described in the first aspect in building waterproofing.

[0010] Through the above technical solution, the present invention has at least the following advantages: (1) The conductive waterproof membrane provided by the present invention has significantly improved comprehensive performance compared with traditional waterproof membrane. It has conductive sensing function, waterproof sealing, weather resistance, high and low temperature resistance, corrosion resistance and flame retardancy, and can be adapted to complex and harsh scenarios such as photovoltaic roofs and chemical plant areas.

[0011] (2) The conductive waterproof membrane provided by the present invention is modified by multi-component compounding so that the conductive layer and the waterproof layer together form a "weather-resistant protective net". It can maintain structural and conductive stability under extreme temperature, strong ultraviolet radiation, chemical corrosion and other scenarios, greatly reduce false alarms caused by environmental interference, and extend the service life of the system to more than 15 years. Detailed Implementation

[0012] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these 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 considered as specifically disclosed herein.

[0013] As mentioned above, a first aspect of the present invention provides a conductive waterproof membrane, the conductive waterproof membrane comprising a conductive layer and a waterproof layer; The raw material composition I forming the conductive layer contains matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fibers, additives, and compound modifier A; the compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I in a mass ratio of 1:1-2; the styrene structural units in the thermoplastic rubber SAM-I contain 20-30 wt%. Based on the total weight of the raw material composition I, the content of the matrix asphalt I is 40-55 wt%, the content of the polyisobutylene is 5-12 wt%, the content of the styrene-butadiene rubber I is 4-8 wt%, the content of the hydrogenated petroleum resin I is 2-5 wt%, the content of SBS-I is 5-10 wt%, the content of the conductive fiber is 8-15 wt%, the content of the additive is 0.6-1.6 wt%, and the content of the compound modifier A is 8-18 wt%. The raw material composition II forming the waterproof layer contains matrix bitumen II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B; the compound modifier B is a combination of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II in a mass ratio of 1:0.5-1; the content of styrene structural units in the thermoplastic rubber SAM-II is 20-30 wt%. Based on the total weight of the raw material composition II, the content of the base asphalt II is 45-55 wt%, the content of the aromatic oil is 8-15 wt%, the content of the styrene-butadiene rubber II is 3-7 wt%, the content of SBS-II is 4-10 wt%, the content of the hydrogenated petroleum resin II is 2-8 wt%, and the content of the compound modifier B is 7-16 wt%.

[0014] Preferably, the thermoplastic rubber SAM-I and thermoplastic rubber SAM-II are each independently selected from at least one of SAM YH-1607, SAM YH-1601, and SAM YH-1603; in this invention, SAM YH-1607, SAM YH-1601, and SAM YH-1603 refer to different grades of thermoplastic rubber SAM from Yueyang Baling Huaxing Petrochemical Co., Ltd., wherein the styrene structural unit content in SAM YH-1607 is 23wt%, and the styrene structural unit content in SAM YH-1601 and SAM YH-1603 is 30wt%.

[0015] Preferably, the compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I in a mass ratio of 1:1.2-1.8. Within this preferred range, optimal adhesion, flame retardancy, and weather resistance of the roll material can be achieved.

[0016] Preferably, the compound modifier B is a combination of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II in a mass ratio of 1:0.6-1. Within this preferred range, the optimal flame retardancy, weather resistance, adhesion, and high and low temperature range of the roll material can be obtained.

[0017] In a preferred embodiment, the chlorine content in the chlorinated polyethylene is 30-40 wt%.

[0018] Preferably, the vinyl chloride-vinyl acetate copolymer has a melting point of 70-100℃ and a density of ≤1.5g / cm³ at 25℃.

[0019] Preferably, the base asphalt I is selected from at least one of 70# base asphalt and 90# base asphalt.

[0020] In this invention, the 70# base asphalt and the 90# base asphalt represent different grades of asphalt; wherein, the penetration of the 70# base asphalt at 25°C is 60-80 (0.1 mm); and the penetration of the 90# base asphalt at 25°C is 80-100 (0.1 mm).

[0021] Preferably, the pour point of the polyisobutylene is -20 to -10°C.

[0022] Preferably, the styrene structural unit content in the styrene-butadiene rubber I is 20-30 wt%.

[0023] Preferably, the softening point of the hydrogenated petroleum resin I is 130-150°C.

[0024] In this invention, SBS-I refers to a styrene-butadiene-styrene block copolymer, wherein the content of styrene structural units is 20-35 wt%.

[0025] Preferably, the conductive fiber is selected from at least one of carbon fiber, steel fiber, and conductive glass fiber.

[0026] More preferably, the conductive fiber is carbon fiber; the length of the carbon fiber is 2-4 mm, and the carbon content is ≥95 wt%.

[0027] Preferably, the additive contains antioxidants, ultraviolet absorbers, and light stabilizers.

[0028] More preferably, the mass ratio of the antioxidant, the ultraviolet absorber and the light stabilizer is 1:0.2-1.7:0.1-0.4.

[0029] Preferably, the antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, and antioxidant 168.

[0030] In a preferred embodiment, the ultraviolet absorber is selected from at least one of UV-531, UV-326, and UV-9.

[0031] Preferably, the light stabilizer is selected from at least one of light stabilizer 770, light stabilizer 944, and light stabilizer 783.

[0032] Preferably, the base asphalt II is selected from at least one of 70# base asphalt and 90# base asphalt.

[0033] Preferably, the aromatic oil contains 70-90 wt% aromatic hydrocarbons.

[0034] Preferably, the styrene structural unit content in the styrene-butadiene rubber II is 20-30 wt%.

[0035] In this invention, SBS-II refers to a styrene-butadiene-styrene block copolymer, wherein the content of styrene structural units is 20-35 wt%.

[0036] It should be noted that, in this invention, the raw material composition II forming the waterproof layer may also contain additives; the additives are selected from at least one of plasticizers and fillers; the fillers may be selected from at least one of talc and calcium carbonate.

[0037] In a preferred embodiment, the thickness of the conductive layer is 0.5-1 mm.

[0038] In a preferred embodiment, the thickness of the waterproof layer is 2-3 mm.

[0039] Preferably, the conductive waterproof membrane further comprises an isolation layer, wherein the conductive layer, the waterproof layer, and the isolation layer are stacked sequentially; the isolation layer is selected from at least one of PE isolation film and anti-sticking sand surface.

[0040] As previously described, a second aspect of the present invention provides a method for preparing the conductive waterproof membrane described in the first aspect, the method comprising: (1) A raw material composition I containing matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fiber, additives, and compound modifier A is first mixed to obtain mixture I; and The raw material composition II, containing matrix asphalt II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B, is mixed a second time to obtain mixture II; (2) The mixture I and the mixture II are coated on the substrate to form the conductive waterproof membrane.

[0041] Preferably, in step (1), the conditions for the first mixing include: a temperature of 170℃-180℃ and a time of 120-150min.

[0042] In a preferred embodiment, in step (1), the raw material composition I further contains a dispersant.

[0043] It should be noted that the present invention does not have any particular requirements on the type and amount of dispersant in the first mixture. Those skilled in the art can choose conventionally, and for example, it can be zinc stearate; the amount of zinc stearate relative to 100 parts by weight of mixture I can be 2-5 parts by weight.

[0044] More preferably, the first mixing step includes: heating the base asphalt I and the polyisobutylene to the temperature of the first mixing to melt them, and holding the temperature for at least 30 minutes to obtain a molten mixture I; continuing to add the SBS-I, the styrene-butadiene rubber I, the compound modifier A, and the hydrogenated petroleum resin I to the molten mixture I at this temperature, and reacting at a stirring speed of 800-1200 rpm for 160-200 minutes to obtain an intermediate I; keeping the reaction temperature constant, adding the additive and the conductive fiber to the intermediate I, and mixing at a stirring speed of 1000-1200 rpm for 120-150 minutes to obtain the mixture I. The inventors have found that, under this specific preferred embodiment, sufficient dispersion of each component can be ensured, which is beneficial for constructing a continuous conductive network.

[0045] Preferably, the conditions for the second mixing include: a temperature of 175-185°C and a time of 200-260 min.

[0046] More preferably, the second mixing step includes: heating the base asphalt II and the aromatic oil to the temperature of the second mixing to melt them, and holding the temperature for more than 50 minutes to obtain a molten mixture II; continuing to add the styrene-butadiene rubber II, the SBS-II, the hydrogenated petroleum resin II, and the compound modifier B to the molten mixture II at this temperature, and reacting at a stirring speed of 800-1200 rpm for 180-220 minutes to obtain intermediate II; finally cooling to 160-170°C, and continuing to react at a stirring speed of 800-1200 rpm for 25-35 minutes to obtain the mixture II.

[0047] In a preferred embodiment, the coating and molding process in step (2) includes: uniformly coating the mixture II onto the pretreated polyester substrate using a dedicated coating equipment, forming a waterproof layer after being compacted by rollers, then brushing the mixture I onto the upper surface of the waterproof layer using a coating machine at a coating temperature of 120-130°C, then shaping it using a three-roll calender to form a conductive layer, then covering the conductive layer with an isolation layer, and finally cooling it naturally to below 50°C before winding it up to obtain the finished conductive waterproof membrane.

[0048] In this invention, the pretreatment refers to: impregnating the dried polyester tire in a preimpregnation tank and then squeezing it dry; the preimpregnation tank contains 70# base bitumen and 10# base bitumen in a mass ratio of 1:0.9-1.1, and the preimpregnation temperature is 190-200℃; the basis weight of the polyester tire is 290-330 g / m². 2 .

[0049] In this invention, the isolation layer is selected from at least one of PE film and PET film.

[0050] As previously stated, the third aspect of the present invention provides the application of the conductive waterproof membrane described in the first aspect in building waterproofing.

[0051] It should be noted that the terms "I" and "II" mentioned in this invention, such as matrix asphalt I, styrene-butadiene rubber I, hydrogenated petroleum resin I, thermoplastic rubber SAM-I, matrix asphalt II, styrene-butadiene rubber II, SBS-I, SBS-II, hydrogenated petroleum resin II, and thermoplastic rubber SAM-II, are merely designations used to distinguish the relevant raw materials used in different compositions to avoid confusion, and have no special meaning.

[0052] The present invention will be described in detail below through embodiments. Unless otherwise specified, the raw materials and equipment used in the following embodiments are commercially available products.

[0053] Raw material composition I: Base Asphalt I: Grade 70# base asphalt, purchased from Sinopec Maoming Petrochemical Branch; Polyisobutylene: pour point -18℃, model number Dalin PB680, purchased from Guangzhou Zhanhong Chemical Co., Ltd.; Styrene-butadiene rubber I: Purchased from Shandong Haifang Rubber Technology Co., Ltd., model HK-B03, with a styrene structural unit content of 22.5-24.5 wt%. Hydrogenated petroleum resin I: Purchased from Puyang Hengtai Petrochemical Co., Ltd., model H5-1140, softening point 145±5℃; SBS-I: Purchased from Guangdong Boruida Polymer Technology Co., Ltd., model number Li Changrong SBS3536, with a styrene structural unit content of 30 wt%; Conductive fiber: carbon fiber, purchased from Texas Carbon Vanbo Composite Materials Co., Ltd., 3mm in length, carbon content ≥95wt%; additive: Antioxidant, Antioxidant 1010, purchased from Nanjing Milan Chemical Co., Ltd. UV absorber, UV-531, purchased from Jinan Haisheng Chemical Co., Ltd. Light stabilizer, light stabilizer 770, purchased from Guangzhou Yinuo Chemical Technology Co., Ltd.; Compound Modifier A: Chlorinated polyethylene with a chlorine content of 36 wt% was purchased from Wuhan Kemic Biomedical Technology Co., Ltd. Thermoplastic rubber SAM-I, with a styrene structural unit content of 23wt%, grade SAM YH-1607, was purchased from Yueyang Baling Huaxing Petrochemical Co., Ltd. SIS, with a styrene structural unit content of 15 wt%, grade SIS 1105, was purchased from Yueyang Baling Huaxing Petrochemical Co., Ltd. Raw material composition II: Base Asphalt II: Grade 70# base asphalt, purchased from Sinopec Maoming Petrochemical Branch; Aromatic oil: purchased from Xingtai Quande Chemical Co., Ltd., with an aromatic content of 70-87 wt%. Styrene-butadiene rubber II: Purchased from Shandong Haifang Rubber Technology Co., Ltd., model HK-B01, with a styrene structural unit content of 22.5-24.5 wt%. SBS-II: Purchased from Guangdong Boruida Polymer Technology Co., Ltd., model number Li Changrong SBS3536, with a styrene structural unit content of 30 wt%. Hydrogenated petroleum resin II: Purchased from Dongguan Bailing New Materials Co., Ltd., model number BIORICH (Germany); Compound Modifier B: Vinyl chloride-vinyl acetate copolymer, melting point 80℃, density ≤1.36g / cm³ at 25℃, purchased from Hubei Baidu Chemical Co., Ltd. Thermoplastic rubber SAM-II, with a styrene content of 23wt%, grade SAM YH-1607, was purchased from Yueyang Baling Huaxing Petrochemical Co., Ltd. Polypropylene, brand name Lizhi New Materials PP recycled granules, was purchased from Wen'an Lizhi New Materials Technology Co., Ltd.

[0054] Example 1 (1) Prepare mixture I and mixture II respectively through the following steps: Preparation of Mixture I: S1. The base bitumen I (3000 kg) and polyisobutylene are heated to 170°C to melt, and the mixture is kept at that temperature for 35 min to obtain molten mixture I; S2. Maintaining the reaction temperature in step S1, continue to add SBS-I, styrene-butadiene rubber I, compound modifier A, and hydrogenated petroleum resin I, and react at a stirring speed of 1200 rpm for 180 min to obtain intermediate I; S3. Finally, add additives (specifically, antioxidants, UV absorbers, and light stabilizers in a mass ratio of 1:1:0.2) and wire fibers to intermediate I in step S2, keep the reaction temperature constant, and continue mixing at a stirring speed of 1200 rpm for 120 min to obtain mixture I.

[0055] Preparation of Mixtures II: S4. The base bitumen II (3000 kg) and aromatic oil are heated to 175°C to melt, and the mixture is kept at that temperature for 55 min to obtain molten mixture II; S5. Maintaining the reaction temperature in step S4, continue to add styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II and compound modifier B, and react at a stirring speed of 1200 rpm for 200 min to obtain intermediate II; S6. Finally, cool the intermediate II obtained in step S5 to 165°C and continue to mix at a stirring speed of 1200 rpm for 30 minutes to obtain mixture II.

[0056] (2) The dried polyester fabric (weight 290g / m²) 2 After being soaked in a pre-impregnation tank, the material is squeezed dry. The pre-impregnation tank contains 70# base asphalt and 10# base asphalt in a mass ratio of 1:1, and the pre-impregnation temperature is 190℃. The mixture II prepared in step (1) is uniformly coated on the polyester substrate using a special coating equipment. After being compacted by rollers, a waterproof layer is formed. Then, the mixture I prepared in step (1) is coated on the upper surface of the waterproof layer using a coating machine at a coating temperature of 120℃. The material is then shaped by a three-roll calender to form a conductive layer. Finally, a PE film is covered on the conductive layer. After naturally cooling to below 50℃, the finished conductive waterproof membrane is rolled up.

[0057] Other process parameters for this embodiment are shown in Table 1.

[0058] Example 2-Example 3 Examples 2-3 all adopted a similar process to that of Example 1. The differences are listed in Table 1. The parts not listed are the same as those in Example 1.

[0059] Example 4 The process was carried out using a similar procedure to that in Example 1. The difference was that the amount of compound modifier A was controlled in the same way as in Example 1, but the mass ratio of chlorinated polyethylene to thermoplastic rubber SAM-I in compound modifier A was 1:1.

[0060] Example 5 The process was carried out using a similar procedure to that of Example 1. The difference was that the amount of compound modifier B was controlled in the same way as in Example 1, but the mass ratio of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II in compound modifier B was 1:0.5.

[0061] Comparative Example 1 The process was carried out using a similar flow as in Example 1, except that in raw material composition I, the content of polyisobutylene was 3 wt%, the content of conductive fiber was 4 wt%, the content of compound modifier A was 20 wt%, and the content of base asphalt I was 49 wt%.

[0062] Comparative Example 2 The process was carried out using a similar flow as in Example 1, except that the content of matrix bitumen II in raw material composition II was 63 wt%, the content of styrene-butadiene rubber II was 4 wt%, and the content of compound modifier B was 6 wt%.

[0063] Comparative Example 3 The process was carried out using a similar flow as in Example 1. The difference was that the amount of compound modifier A in raw material composition I was controlled in the same way as in Example 1, but compound modifier A was a combination of chlorinated polyethylene and SIS 1105 in a mass ratio of 1:1.2.

[0064] Comparative Example 4 The process was carried out using a similar procedure to that of Example 1. The difference was that the amount of compound modifier B in raw material composition II was controlled in the same manner as in Example 1, but compound modifier B was a combination of polypropylene and thermoplastic rubber SAM-II in a mass ratio of 1:1.1.

[0065] Comparative Example 5 It uses commercially available ordinary SBS modified bitumen waterproof membrane, without a conductive layer.

[0066] Table 1

[0067] Test Example 1 The performance test data of the waterproof membranes in the examples and comparative examples are shown in Table 2.

[0068] The methods for determining the thickness of the conductive layer, the thickness of the waterproof layer, the maximum tensile strength, the elongation at the maximum tensile strength, the high and low temperature resistance range, and the impermeability, as well as the operation method for accelerated aging, shall be in accordance with GB 18242-2008 "Elastomer Modified Bituminous Waterproof Membranes".

[0069] Surface resistivity was measured in accordance with GB / T 31838.2-2019 "Dielectric and resistive properties of solid insulating materials - Part 2: Resistive properties (DC method) - Volume resistivity and volume resistivity".

[0070] The evaluation method for flame retardancy rating refers to GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products".

[0071] The test method for low-temperature flexibility after corrosion is as follows: the waterproof membrane is soaked in a 5wt% sodium hydroxide solution for 7 days and then taken out at a soaking temperature of 23℃. After taking it out, it is placed at 25℃ for 8 hours to dry. The low-temperature flexibility is tested in accordance with GB 18242-2008 "Elastomer Modified Bituminous Waterproof Membrane".

[0072] The test method for peel strength refers to GB 23441-2009 "Self-adhesive polymer modified bitumen waterproof membrane".

[0073] Table 2

[0074] The results above demonstrate that the conductive waterproof membrane provided by this invention exhibits excellent overall performance: its surface resistivity remains stable at 10. 3 -10 4 Ω / m 2 The material exhibits excellent conductivity; after accelerated aging, its conductivity and mechanical properties remain remarkably well-maintained, demonstrating its superior weather resistance. Furthermore, the waterproof membrane provided by this invention meets or exceeds the requirements of demanding application scenarios in terms of flame retardancy, high and low temperature resistance, corrosion resistance, and impermeability, with outstanding and stable performance indicators. Comparative Examples 1-4, due to the content of some components exceeding the scope of this invention or the use of alternative modifiers (specifically SIS and polypropylene), showed a significant decrease in performance, particularly in conductive stability, aging resistance, and flame retardancy. Comparative Example 5 (traditional membrane) completely lacks conductive function, and its performance is significantly lower than that of the conductive waterproof membrane provided by this invention.

[0075] Test Example 2 The present invention provides, by way of example, the test results of the electrical conductivity of the waterproof membrane prepared in Example 1, and the specific test method includes the following steps: 1. System Setup: For each 1m×1m roll sample (conductive layer facing up), two 1m long and 5mm wide strips of copper foil are bonded parallel to each end using conductive silver paste as electrodes, with an electrode spacing of 80cm. The electrodes are then connected to a detection circuit consisting of a DC low-voltage (12V) constant voltage source and a high-precision ammeter (or resistance meter).

[0076] 2. Testing process: A drip tube with controllable flow rate is placed above the center area of ​​the roll sample. Initially, the background current value I0 (or resistance value R0) of the circuit is recorded. Then, the drip tube is turned on, and tap water is added at a rate of 10 mL per minute to simulate leakage.

[0077] Test results show that when water droplets begin to wet and penetrate the conductive layer, forming a conductive path, the current in the detection circuit rapidly increases from I0 (2.3 mA) within 30 seconds and stabilizes at I1 (18.5 mA), equivalent to a decrease in resistance by an order of magnitude. The system alarm is successfully triggered. After the dripping stops, due to residual moisture, the current decreases slowly but remains higher than the background value, continuously indicating the location of the leak. In contrast, the circuit current of traditional roll materials remains unchanged throughout the test, and the system fails to generate a leak alarm.

[0078] The above results demonstrate that the conductive waterproof membrane of this invention can be successfully integrated into a leakage monitoring system. Its conductive layer is highly sensitive to water immersion, causing a rapid and measurable change in resistance, thereby enabling real-time, location-based alarm for leaks. Traditional waterproof membranes lack this function. This confirms that the product of this invention represents a technological leap from "passive waterproofing" to "active monitoring + waterproofing."

[0079] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A conductive waterproof membrane, characterized in that, The conductive waterproof membrane includes a conductive layer and a waterproof layer; The raw material composition I forming the conductive layer contains matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fibers, additives, and compound modifier A; the compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I in a mass ratio of 1:1-2; the styrene structural units in the thermoplastic rubber SAM-I contain 20-30 wt%. Based on the total weight of the raw material composition I, the content of the matrix asphalt I is 40-55 wt%, the content of the polyisobutylene is 5-12 wt%, the content of the styrene-butadiene rubber I is 4-8 wt%, the content of the hydrogenated petroleum resin I is 2-5 wt%, the content of SBS-I is 5-10 wt%, the content of the conductive fiber is 8-15 wt%, the content of the additive is 0.6-1.6 wt%, and the content of the compound modifier A is 8-18 wt%. The raw material composition II forming the waterproof layer contains matrix bitumen II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B; the compound modifier B is a combination of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II in a mass ratio of 1:0.5-1; the content of styrene structural units in the thermoplastic rubber SAM-II is 20-30 wt%. Based on the total weight of the raw material composition II, the content of the base asphalt II is 45-55 wt%, the content of the aromatic oil is 8-15 wt%, the content of the styrene-butadiene rubber II is 3-7 wt%, the content of SBS-II is 4-10 wt%, the content of the hydrogenated petroleum resin II is 2-8 wt%, and the content of the compound modifier B is 7-16 wt%.

2. The waterproof membrane according to claim 1, characterized in that, The compound modifier A is a combination of chlorinated polyethylene and thermoplastic rubber SAM-I with a content-to-mass ratio of 1:1.2-1.

8.

3. The waterproof membrane according to claim 1, characterized in that, The compound modifier B is a combination of vinyl chloride-vinyl acetate copolymer and thermoplastic rubber SAM-II with a content-to-mass ratio of 1:0.6-1.

4. The waterproof membrane according to any one of claims 1-3, characterized in that, The chlorine content in the chlorinated polyethylene is 30-40 wt%.

5. The waterproof membrane according to any one of claims 1-3, characterized in that, The vinyl chloride-vinyl acetate copolymer has a melting point of 70-100℃ and a density of ≤1.5g / cm³ at 25℃.

6. The waterproof membrane according to any one of claims 1-3, characterized in that, The additive contains antioxidants, ultraviolet absorbers, and light stabilizers; And / or, the mass ratio of the antioxidant, the ultraviolet absorber and the light stabilizer is 1:0.2-1.7:0.1-0.

4.

7. The waterproof membrane according to any one of claims 1-3, characterized in that, The thickness of the conductive layer is 0.5-1 mm; And / or, the thickness of the waterproof layer is 2-3 mm.

8. A method for preparing the conductive waterproof membrane according to any one of claims 1-7, characterized in that, The method includes: (1) A raw material composition I containing matrix asphalt I, polyisobutylene, styrene-butadiene rubber I, hydrogenated petroleum resin I, SBS-I, conductive fiber, additives, and compound modifier A is first mixed to obtain mixture I; and The raw material composition II, containing matrix asphalt II, aromatic oil, styrene-butadiene rubber II, SBS-II, hydrogenated petroleum resin II, and compound modifier B, is mixed a second time to obtain mixture II; (2) The mixture I and the mixture II are coated on the substrate to form the conductive waterproof membrane.

9. The method according to claim 8, characterized in that, In step (1), the conditions for the first mixing include: a temperature of 170-180°C and a time of 120-150 min; And / or, the conditions for the second mixing include: a temperature of 175-185°C and a time of 200-260 min.

10. The application of the conductive waterproof membrane according to any one of claims 1-7 in building waterproofing.

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