Fluorocarbon adhesive film-asphalt-based composite high-adhesion durable waterproofing membrane and preparation method thereof

Abstract

This invention discloses a high-adhesion, durable waterproof membrane composed of a fluorocarbon film and an asphalt-based composite, and its preparation method. The membrane, from top to bottom, consists of a fluorocarbon film layer, an epoxy-modified polyurethane hot melt adhesive transition layer, an asphalt-based membrane layer, and a base reinforcement layer. Each layer has specific components and thickness ratios. During preparation, the fluorocarbon film layer and the asphalt-based membrane layer are first prepared separately, and then the adhesive transition layer is melt-coated, pressure-bonded, and cooled to form the membrane. This invention solves the problem of poor adhesion between fluorocarbon and asphalt-based materials, and possesses excellent weather resistance, aging resistance, waterproof sealing, and mechanical properties. The interlayer bonding is stable, and the service life is long, making it suitable for high-rise buildings and bridges with stringent waterproofing requirements.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a fluorocarbon film-asphalt-based composite high-adhesion durable waterproof membrane and its preparation method. Background Technology

[0002] Waterproof membranes are the core material in building waterproofing projects, and their performance directly determines the quality and service life of the waterproofing project. Currently, the mainstream waterproof membranes on the market mainly include two categories: bitumen-based waterproof membranes and polymer waterproof membranes. Bitumen-based waterproof membranes are widely used due to the availability of raw materials, good waterproofing and sealing properties, and low cost. However, they suffer from poor weather resistance and insufficient aging resistance, and are prone to cracking and embrittlement when exposed to sunlight, wind, rain, and other natural environments for extended periods, leading to waterproofing failure. Fluorocarbon materials in polymer waterproof membranes have excellent weather resistance and aging resistance, but their adhesion to bitumen-based materials is poor, and direct lamination can easily lead to interlayer delamination, making it difficult to form a stable composite structure.

[0003] To balance weather resistance and adhesion, existing technologies have developed composite products combining fluorocarbon films and bitumen-based membranes. However, most of these rely on simple physical bonding without dedicated bonding transition structures, resulting in insufficient interlayer bonding strength. Furthermore, the modification systems of bitumen-based membranes themselves are incomplete, limiting improvements in mechanical properties and durability, making it difficult to meet the stringent requirements of high-rise buildings and bridges for high adhesion and durability in waterproof membranes. In addition, the preparation processes of some composite membranes lack targeted control, leading to uneven mixing of components and weak interlayer bonding, further affecting the overall performance of the product. Based on the shortcomings of existing technologies, this paper proposes a composite waterproof membrane and its preparation method that achieves stable bonding between fluorocarbon and bitumen-based materials while possessing excellent weather resistance, waterproofing, and mechanical properties. Summary of the Invention

[0004] The purpose of this invention is to provide a high-adhesion and durable waterproof membrane based on fluorocarbon film and bitumen, and its preparation method, so as to solve the technical problems of insufficient interlayer bonding strength, limited mechanical properties and durability of existing waterproof membranes.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-adhesion, durable waterproof membrane composed of a fluorocarbon film and an asphalt-based composite material comprises, from top to bottom, a fluorocarbon film layer, an adhesive transition layer, an asphalt-based membrane layer, and a base reinforcement layer. The fluorocarbon film layer is composed of the following components in parts by weight: 60-80 parts polyvinylidene fluoride resin, 15-25 parts tetrafluoroethylene-hexafluoropropylene copolymer, 3-8 parts toughening agent, 0.5-2 parts antioxidant, and 0.3-1.5 parts ultraviolet absorber. The adhesive transition layer is an epoxy-modified polyurethane hot melt adhesive layer with a thickness of 0.1-0.3 mm. The asphalt-based membrane layer is composed of the following components in parts by weight: 40-60 parts base asphalt, 5-12 parts SBS modifier, 3-8 parts butyl rubber, 10-20 parts nano-calcium carbonate, 5-15 parts talc, and 1-3 parts anti-aging agent.

[0007] As a preferred embodiment of the present invention, in the fluorocarbon film layer, the toughening agent is an acrylate copolymer, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone.

[0008] As a preferred embodiment of the present invention, in the asphalt-based roll layer, the base asphalt is 70# road petroleum asphalt, the particle size of nano-calcium carbonate is 50-100nm, and the anti-aging agent is a compound of N-phenyl-α-naphthylamine and 2,2,4-trimethyl-1,2-dihydroquinoline polymer, with a compound mass ratio of 1:1-3.

[0009] As a preferred embodiment of the present invention, the base reinforcement layer is a polyester nonwoven fabric or a fiberglass mesh fabric, and the unit area mass of the base reinforcement layer is 100-150g / m², wherein the tensile strength of the polyester nonwoven fabric is ≥500N / 5cm, and the tensile strength of the fiberglass mesh fabric is ≥800N / 5cm.

[0010] As a preferred embodiment of the present invention, the thickness of the fluorocarbon film layer is 0.2-0.5 mm, the thickness of the bitumen-based membrane layer is 1.5-3.0 mm, and the total thickness of the entire waterproof membrane is 2.0-4.0 mm.

[0011] This invention also provides a method for preparing a high-adhesion, durable waterproof membrane based on fluorocarbon film and bitumen, characterized by comprising the following steps:

[0012] Step 1: Prepare the fluorocarbon film layer. Mix polyvinylidene fluoride resin, tetrafluoroethylene-hexafluoropropylene copolymer, toughening agent, antioxidant and ultraviolet absorber in proportion, put them into a twin-screw extruder, melt blend at 160-200℃, extrude through T-die and cool to shape to obtain the fluorocarbon film layer.

[0013] Step 2: Prepare the asphalt-based roll layer. Heat the base asphalt to 120-140℃ to melt it, add SBS modifier and butyl rubber, stir and heat to 170-190℃, hold for heat and shear for 30-60 minutes, then add nano calcium carbonate, talc powder and anti-aging agent, continue stirring for 20-40 minutes to obtain the modified asphalt mixture, coat it on the surface of the base reinforcement layer, roll it flat and cool it to 80-100℃ to obtain the asphalt-based roll layer;

[0014] Step 3: Composite molding. The epoxy-modified polyurethane hot melt adhesive is heated to 120-140℃ to melt it and uniformly coated on the surface of the bitumen-based roll layer obtained in Step 2 to form an adhesive transition layer. Then, the fluorocarbon film layer obtained in Step 1 is bonded to the surface of the adhesive transition layer and pressed by a pressure roller at a temperature of 80-100℃ and a pressure of 0.3-0.5MPa. Finally, it is cooled to room temperature to obtain the waterproof roll.

[0015] As a preferred embodiment of the present invention, in step 1, the screw speed of the twin-screw extruder is 100-150 r / min, the extrusion speed is 1-3 m / min, and the cooling and shaping is carried out by water cooling with a cooling water temperature of 20-30℃.

[0016] As a preferred embodiment of the present invention, in step 2, the coating thickness of the modified asphalt mixture is 1.5-3.0 mm, the rolling is carried out by double roller rolling, the rolling speed is 0.5-1.0 m / min, and the rolling number is 2-3 times.

[0017] As a preferred embodiment of the present invention, in step 3, the coating amount of epoxy modified polyurethane hot melt adhesive is 100-150g / m², and the tension of the fluorocarbon adhesive film layer is controlled at 5-10N / m during the bonding process to avoid wrinkles.

[0018] As a preferred embodiment of the present invention, step 3, after cooling to room temperature, further includes trimming and winding steps. The trimming is performed using an automatic trimming machine with a trimming accuracy of ±0.5mm, a winding speed of 1-2m / min, and a winding tension of 8-12N / m.

[0019] The present invention has the following beneficial effects:

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In terms of bonding performance, the dedicated epoxy-modified polyurethane hot melt adhesive bonding transition layer can form a stable bonding interface with the fluorocarbon film layer and the asphalt-based roll layer, effectively solving the industry pain point of poor adhesion between fluorocarbon materials and asphalt-based materials, and avoiding interlayer delamination during use.

[0022] 2. In terms of durability, the combination of polyvinylidene fluoride resin and tetrafluoroethylene-hexafluoropropylene copolymer in the fluorocarbon film layer, along with the synergistic effect of antioxidants and UV absorbers, significantly improves the anti-aging and weather resistance of the roll material, enabling it to resist the erosion of the natural environment for a long time. The composite modification of SBS modifier and butyl rubber in the asphalt-based roll material layer, combined with compound anti-aging agents, further enhances the anti-aging performance and service life of the roll material.

[0023] 3. In terms of waterproofing and mechanical properties, the uniform dispersion of nanofillers in the bitumen-based membrane layer enhances the membrane's density, ensuring excellent waterproofing and sealing effects. The introduction of the base reinforcement layer provides reliable structural support for the membrane, effectively distributing stress and improving overall tensile and deformation resistance, adapting to base deformation under different construction scenarios. Simultaneously, targeted process control ensures uniform mixing of components and tight bonding between layers, resulting in stable and consistent overall performance of the membrane. This balances construction adaptability and economy, resolving the issue of uneven performance in existing composite waterproof membranes. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart illustrating the preparation method of the fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane provided in this embodiment of the invention; Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0027] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0029] This invention discloses a high-adhesion, durable waterproof membrane composed of a fluorocarbon film and an asphalt-based composite material, comprising, from top to bottom, a composite fluorocarbon film layer, an adhesive transition layer, an asphalt-based membrane layer, and a base reinforcement layer. The fluorocarbon film layer is composed of the following components in parts by weight: 60-80 parts polyvinylidene fluoride resin, 15-25 parts tetrafluoroethylene-hexafluoropropylene copolymer, 3-8 parts toughening agent, 0.5-2 parts antioxidant, and 0.3-1.5 parts ultraviolet absorber. The adhesive transition layer is an epoxy-modified polyurethane hot melt adhesive layer with a thickness of 0.1-0.3 mm. The asphalt-based membrane layer is composed of the following components in parts by weight: 40-60 parts base asphalt, 5-12 parts SBS modifier, 3-8 parts butyl rubber, 10-20 parts nano-calcium carbonate, 5-15 parts talc, and 1-3 parts anti-aging agent.

[0030] The membrane employs a composite structure consisting of a fluorocarbon film layer, an adhesive transition layer, an asphalt-based membrane layer, and a base reinforcement layer. The resin components of the fluorocarbon film layer provide the membrane with excellent weather resistance and anti-aging properties. The adhesive transition layer, composed of epoxy-modified polyurethane hot melt adhesive, effectively improves the bonding reliability between the fluorocarbon film layer and the asphalt-based membrane layer, preventing interlayer delamination. The combination of modifiers and fillers in the asphalt-based membrane layer enhances the membrane's waterproof sealing and mechanical strength, while the base reinforcement layer further improves the overall structural stability, giving the membrane a comprehensive combination of high adhesion, durability, and waterproofing.

[0031] In the fluorocarbon film layer, the toughening agent is an acrylate copolymer, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone.

[0032] The fluorocarbon film layer uses acrylate copolymers as toughening agents, which can improve the toughness of the film and prevent cracking due to stress during use; specific antioxidants can inhibit the oxidative degradation of the film and slow down the aging rate; specific UV absorbers can effectively absorb ultraviolet rays and reduce the damage of ultraviolet rays to the film, thereby improving the weather resistance and service life of the fluorocarbon film layer.

[0033] In the asphalt-based roll layer, the base asphalt is 70# road petroleum asphalt, the particle size of nano-calcium carbonate is 50-100nm, and the anti-aging agent is a compound of N-phenyl-α-naphthylamine and 2,2,4-trimethyl-1,2-dihydroquinoline polymer, with a compound mass ratio of 1:1-3.

[0034] The asphalt-based membrane layer uses 70# road petroleum asphalt as the matrix, which has good basic adhesion and waterproof properties; the nano-sized calcium carbonate particles are small and can be more evenly dispersed in the asphalt matrix, enhancing the mechanical strength and density of the asphalt layer; the compounded anti-aging agent can play a synergistic role, which can more comprehensively inhibit asphalt aging than a single anti-aging agent, reduce cracking and embrittlement caused by aging, and improve the durability of the asphalt-based membrane layer.

[0035] The base reinforcement layer is made of polyester nonwoven fabric or fiberglass mesh, and the unit area mass of the base reinforcement layer is 100-150g / m². The tensile strength of the polyester nonwoven fabric is ≥500N / 5cm, and the tensile strength of the fiberglass mesh is ≥800N / 5cm.

[0036] The base reinforcement layer is made of polyester nonwoven fabric or fiberglass mesh, both of which have strong mechanical properties and can provide structural support for the roll material. The selection of specific unit area mass and tensile strength can ensure that the base reinforcement layer is not easy to break under stress, effectively disperse the stress borne by the roll material, improve the overall tensile and deformation resistance of the roll material, and adapt to the deformation of the base layer during construction and use.

[0037] The thickness of the fluorocarbon film layer is 0.2-0.5mm, the thickness of the bitumen-based membrane layer is 1.5-3.0mm, and the total thickness of the entire waterproof membrane is 2.0-4.0mm.

[0038] The thickness of the fluorocarbon film layer ensures that it fully performs its weather protection function, while avoiding the increased cost and construction inconvenience caused by excessive thickness; the thickness of the bitumen-based membrane layer ensures waterproof sealing effect, taking into account mechanical properties and economy; the total thickness formed by the combination of the thicknesses of each layer allows the membrane to have sufficient protection and structural strength while maintaining good construction adaptability and facilitating laying operations.

[0039] The preparation method of the above embodiments of the present invention, such as Figure 1 As shown, it includes the following steps:

[0040] Step 1: Prepare the fluorocarbon film layer. Mix polyvinylidene fluoride resin, tetrafluoroethylene-hexafluoropropylene copolymer, toughening agent, antioxidant and ultraviolet absorber in proportion, put them into a twin-screw extruder, melt blend at 160-200℃, extrude through T-die and cool to shape to obtain the fluorocarbon film layer.

[0041] Step 2: Prepare the asphalt-based roll layer. Heat the base asphalt to 120-140℃ to melt it, add SBS modifier and butyl rubber, stir and heat to 170-190℃, hold for heat and shear for 30-60 minutes, then add nano calcium carbonate, talc powder and anti-aging agent, continue stirring for 20-40 minutes to obtain the modified asphalt mixture, coat it on the surface of the base reinforcement layer, roll it flat and cool it to 80-100℃ to obtain the asphalt-based roll layer;

[0042] Step 3: Composite molding. The epoxy-modified polyurethane hot melt adhesive is heated to 120-140℃ to melt it and uniformly coated on the surface of the bitumen-based roll layer obtained in Step 2 to form an adhesive transition layer. Then, the fluorocarbon film layer obtained in Step 1 is bonded to the surface of the adhesive transition layer and pressed by a pressure roller at a temperature of 80-100℃ and a pressure of 0.3-0.5MPa. Finally, it is cooled to room temperature to obtain the waterproof roll.

[0043] The fluorocarbon film layer adopts a melt-blending extrusion process, which can fully mix all components and ensure stable and consistent film performance. The heating, melting, shearing and stirring process of the asphalt-based roll layer can promote the full integration of modifier and base asphalt, and the filler is more evenly dispersed, improving the performance of the asphalt layer. After coating and rolling, it is tightly bonded to the base reinforcement layer. During composite molding, the hot melt adhesive is melted and coated and then pressed together, which can ensure that each layer is tightly bonded, reduce interlayer gaps, improve the overall bonding reliability, and after cooling and shaping, the roll structure is stable and the comprehensive performance meets the standards.

[0044] In step 1, the screw speed of the twin-screw extruder is 100-150 r / min, the extrusion speed is 1-3 m / min, and the cooling and shaping are carried out by water cooling with a water temperature of 20-30℃.

[0045] Matching the rotational speed and extrusion speed of the twin-screw extruder ensures thorough melting and blending of the fluorocarbon film layer, while maintaining uniform film thickness. The water cooling method and water temperature control enable rapid and gentle cooling of the film, preventing excessive cooling from causing internal stress or cracking, thus ensuring stable film forming quality and uniform performance.

[0046] In step 2, the coating thickness of the modified asphalt mixture is 1.5-3.0 mm, and the rolling is carried out by double roller rolling at a speed of 0.5-1.0 m / min and 2-3 times.

[0047] Controlling the coating thickness of modified asphalt mixtures ensures that the waterproofing and mechanical properties of the asphalt-based roll layer meet the standards. The twin-roller compaction method, combined with specific compaction speeds and cycles, allows the asphalt mixture to fully adhere to the base reinforcement layer, expelling interlayer air, reducing voids, improving the density of the asphalt layer and its bonding strength with the reinforcement layer, and preventing delamination during use.

[0048] In step 3, the coating amount of epoxy-modified polyurethane hot melt adhesive is 100-150g / m², and the tension of the fluorocarbon adhesive film layer is controlled at 5-10N / m during the bonding process to avoid wrinkles.

[0049] Controlling the coating amount of epoxy-modified polyurethane hot melt adhesive can ensure sufficient bonding strength while avoiding material waste or overflow caused by excessive coating. Tension control of the fluorocarbon film layer during bonding can prevent wrinkles in the film, ensure that the film is flatly bonded to the bonding transition layer, ensure uniform interlayer contact, improve bonding stability, and avoid local bonding failure caused by wrinkles.

[0050] Step 3, after cooling to room temperature, also includes trimming and winding steps. Trimming is done using an automatic trimming machine with a trimming accuracy of ±0.5mm. The winding speed is 1-2m / min and the winding tension is 8-12N / m.

[0051] Automatic edge trimming machines ensure neat edges on the roll material, preventing uneven edges from affecting the sealing of the joints during construction. Matching and controlling the winding speed and tension prevents the roll material from becoming loose or excessively stretched and deformed during winding, ensuring that the rolled material has a neat shape after winding, which is convenient for storage, transportation and subsequent construction and laying.

[0052] The working principle of this invention is based on the functional synergy of each layer and the interaction between components to form a comprehensive waterproof protection system. The surface fluorocarbon film layer serves as the first line of defense. Its fluorocarbon resin molecular structure is stable and can effectively resist the erosion of environmental factors such as ultraviolet rays, oxygen, and moisture, reducing the damage of the external environment to the internal structure. Antioxidants slow down the aging and degradation rate of the film by inhibiting oxidation reactions, while ultraviolet absorbers can absorb ultraviolet energy and convert it into heat energy, further reducing the damage of ultraviolet rays to the roll material.

[0053] The bonding transition layer uses epoxy-modified polyurethane hot melt adhesive, which combines the high strength of epoxy resin with the good adhesion of polyurethane. After heating and melting, it can form physical adsorption and chemical bonding with the surface of the fluorocarbon film layer, and simultaneously achieve compatibility bonding with the asphalt components of the asphalt-based membrane layer, forming a stable bonding interface. This tightly connects the fluorocarbon film layer and the asphalt-based membrane layer into a whole, preventing waterproofing failure caused by interlayer separation. The asphalt-based membrane layer, as the main waterproofing core layer, has excellent waterproofing and sealing properties due to the asphalt matrix itself. The addition of SBS modifier and butyl rubber enhances the elasticity and toughness of the asphalt, reducing cracking caused by temperature changes. The dispersion and filling of fillers such as nano-calcium carbonate refines the internal structure of the asphalt, increases its density, and prevents water penetration.

[0054] The polyester nonwoven fabric or fiberglass mesh in the base reinforcement layer, with its excellent mechanical properties, can evenly distribute the tensile and impact forces borne by the roll material, reducing damage caused by localized stress concentration. It also enhances the adhesion between the roll material and the base layer, adapting to minor deformations of the base layer and ensuring the roll material maintains its intact waterproof structure throughout construction and use. Through the above-mentioned mechanisms, each layer works synergistically to form an integrated system of "surface protection - intermediate bonding - core waterproofing - structural reinforcement," achieving comprehensive performance of high adhesion, high durability, and high waterproofing.

[0055] The application method of the waterproof membrane of this invention should follow these steps to ensure construction quality and waterproofing effect:

[0056] The first step is substrate pretreatment: Before construction, it is necessary to ensure that the surface of the substrate (such as roof, basement floor, bridge pavement layer, etc.) is flat, dry, free of dust, oil stains and sharp debris. If there are cracks or depressions in the substrate, special repair materials should be used to fill and flatten it. Corners should be rounded to avoid damage to the roll material due to stress concentration.

[0057] The second step is to prepare for the roll material installation: Based on the construction area and the shape of the base layer, plan the laying direction and overlap width of the roll material in advance. The overlap width is usually not less than 100mm. Place the roll material in the construction environment for a period of time to allow it to adapt to the ambient temperature and avoid shrinkage or wrinkling of the roll material due to temperature differences during installation.

[0058] The third step is the installation of the roll material: This can be done using either the loose-lay or wet-lay method. The loose-lay method is suitable for dry and flat substrates; simply lay the roll material flat on the substrate surface, ensuring it is smooth and wrinkle-free. The wet-lay method is suitable for substrates with higher humidity but no standing water; apply a special primer to the substrate surface and allow it to dry completely before laying the roll material. During installation, adjust the roll material position section by section to ensure accurate alignment.

[0059] Step 4, treatment of overlap joints: The overlap joints of the roll material must be cleaned and sealed using the hot melt method. Use a special hot melt tool to heat the overlap joints, so that the hot melt adhesive components of the bonding transition layer melt and flow. Then use a pressure roller to apply pressure to ensure that the overlap joints are tightly bonded without air bubbles or gaps. The edges of the overlap joints must be sealed with sealant to further improve the sealing performance.

[0060] Step 5, Compaction and Inspection: After all the rolls of material are laid, use a pressure roller to fully compact the surface of the rolls to ensure that the rolls are tightly bonded to the base layer and to each other. After construction, a water tightness test or water storage test should be conducted to check for any leaks. If any leaks are found, the corresponding parts should be repaired in time.

[0061] Step 6, Post-construction protection: After the waterproof membrane is installed, the subsequent protective layer (such as cement mortar protective layer, concrete protective layer, etc.) should be installed as soon as possible to avoid the membrane being exposed to sunlight for a long time and aging faster. Sharp tools should be avoided to prevent damage to the membrane during the construction of the protective layer.

[0062] In summary, this invention achieves an organic integration of multiple technical effects through the synergistic optimization of the four-layer composite structure design and the components and preparation process of each layer, specifically manifested as follows:

[0063] 1. In terms of bonding performance, the dedicated epoxy-modified polyurethane hot melt adhesive bonding transition layer can form a stable bonding interface with the fluorocarbon film layer and the asphalt-based roll layer, effectively solving the industry pain point of poor adhesion between fluorocarbon materials and asphalt-based materials, and avoiding interlayer delamination during use.

[0064] 2. In terms of durability, the combination of polyvinylidene fluoride resin and tetrafluoroethylene-hexafluoropropylene copolymer in the fluorocarbon film layer, along with the synergistic effect of antioxidants and UV absorbers, significantly improves the anti-aging and weather resistance of the roll material, enabling it to resist the erosion of the natural environment for a long time. The composite modification of SBS modifier and butyl rubber in the asphalt-based roll material layer, combined with compound anti-aging agents, further enhances the anti-aging performance and service life of the roll material.

[0065] 3. In terms of waterproofing and mechanical properties, the uniform dispersion of nanofillers in the bitumen-based membrane layer enhances the membrane's density, ensuring excellent waterproofing and sealing effects. The introduction of the base reinforcement layer provides reliable structural support for the membrane, effectively distributing stress and improving overall tensile and deformation resistance, adapting to base deformation under different construction scenarios. Simultaneously, targeted process control ensures uniform mixing of components and tight bonding between layers, resulting in stable and consistent overall performance of the membrane. This balances construction adaptability and economy, resolving the issue of uneven performance in existing composite waterproof membranes.

[0066] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A fluorocarbon film-asphalt-based composite high-adhesion, durable waterproof membrane, characterized in that: The material comprises, from top to bottom, a fluorocarbon film layer, an adhesive transition layer, an asphalt-based roll layer, and a base reinforcement layer. The fluorocarbon film layer is composed of the following components in parts by weight: 60-80 parts polyvinylidene fluoride resin, 15-25 parts tetrafluoroethylene-hexafluoropropylene copolymer, 3-8 parts toughening agent, 0.5-2 parts antioxidant, and 0.3-1.5 parts ultraviolet absorber. The adhesive transition layer is an epoxy-modified polyurethane hot melt adhesive layer with a thickness of 0.1-0.3 mm. The asphalt-based roll layer is composed of the following components in parts by weight: 40-60 parts base asphalt, 5-12 parts SBS modifier, 3-8 parts butyl rubber, 10-20 parts nano-calcium carbonate, 5-15 parts talc, and 1-3 parts anti-aging agent.

2. The fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane according to claim 1, characterized in that: In the fluorocarbon film layer, the toughening agent is an acrylate copolymer, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the ultraviolet absorber is 2-hydroxy-4-methoxybenzophenone.

3. The fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane according to claim 1, characterized in that: In the asphalt-based roll layer, the base asphalt is 70# road petroleum asphalt, the particle size of nano-calcium carbonate is 50-100nm, and the anti-aging agent is a compound of N-phenyl-α-naphthylamine and 2,2,4-trimethyl-1,2-dihydroquinoline polymer, with a compound mass ratio of 1:1-3.

4. The fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane according to claim 1, characterized in that: The base reinforcement layer is made of polyester nonwoven fabric or fiberglass mesh fabric, and the unit area mass of the base reinforcement layer is 100-150g / m², wherein the tensile strength of the polyester nonwoven fabric is ≥500N / 5cm, and the tensile strength of the fiberglass mesh fabric is ≥800N / 5cm.

5. The fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane according to claim 1, characterized in that: The thickness of the fluorocarbon film layer is 0.2-0.5mm, the thickness of the bitumen-based membrane layer is 1.5-3.0mm, and the total thickness of the entire waterproof membrane is 2.0-4.0mm.

6. A method for preparing a fluorocarbon film-asphalt-based composite high-adhesion and durable waterproof membrane as described in any one of claims 1-5, characterized in that... Includes the following steps: Step 1: Prepare the fluorocarbon film layer. Mix polyvinylidene fluoride resin, tetrafluoroethylene-hexafluoropropylene copolymer, toughening agent, antioxidant and ultraviolet absorber in proportion, put them into a twin-screw extruder, melt blend at 160-200℃, extrude through T-die and cool to shape to obtain the fluorocarbon film layer. Step 2: Prepare the asphalt-based roll layer. Heat the base asphalt to 120-140℃ to melt it, add SBS modifier and butyl rubber, stir and heat to 170-190℃, hold for heat and shear for 30-60 minutes, then add nano calcium carbonate, talc powder and anti-aging agent, continue stirring for 20-40 minutes to obtain the modified asphalt mixture, coat it on the surface of the base reinforcement layer, roll it flat and cool it to 80-100℃ to obtain the asphalt-based roll layer; Step 3: Composite molding. The epoxy-modified polyurethane hot melt adhesive is heated to 120-140℃ to melt it and uniformly coated on the surface of the bitumen-based roll layer obtained in Step 2 to form an adhesive transition layer. Then, the fluorocarbon film layer obtained in Step 1 is bonded to the surface of the adhesive transition layer and pressed by a pressure roller at a temperature of 80-100℃ and a pressure of 0.3-0.5MPa. Finally, it is cooled to room temperature to obtain the waterproof roll.

7. The fluorocarbon film-asphalt-based composite high-adhesion durable waterproof membrane and its preparation method according to claim 6, characterized in that: In step 1, the screw speed of the twin-screw extruder is 100-150 r / min, the extrusion speed is 1-3 m / min, and the cooling and shaping are carried out by water cooling with a water temperature of 20-30℃.

8. The fluorocarbon film-asphalt-based composite high-adhesion durable waterproof membrane and its preparation method according to claim 6, characterized in that: In step 2, the coating thickness of the modified asphalt mixture is 1.5-3.0 mm, the rolling is carried out by double roller rolling, the rolling speed is 0.5-1.0 m / min, and the rolling is carried out 2-3 times.

9. The fluorocarbon film-asphalt-based composite high-adhesion durable waterproof membrane and its preparation method according to claim 6, characterized in that: In step 3, the coating amount of epoxy-modified polyurethane hot melt adhesive is 100-150 g / m², and the tension of the fluorocarbon adhesive film layer is controlled at 5-10 N / m during the bonding process to avoid wrinkles.

10. The fluorocarbon film-asphalt-based composite high-adhesion durable waterproof membrane and its preparation method according to claim 6, characterized in that: Step 3, after cooling to room temperature, also includes trimming and winding steps. Trimming is done using an automatic trimming machine with a trimming accuracy of ±0.5mm. The winding speed is 1-2m / min and the winding tension is 8-12N / m.

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