Waterproof coiled material with stainless steel foil surface as well as preparation method and application of waterproof coiled material

Abstract

The invention provides a stainless steel foil surface waterproof roll and a preparation method and application thereof, and belongs to the technical field of waterproof materials. The stainless steel foil surface waterproof coiled material sequentially comprises a stainless steel foil, an epoxy modified bonding transition layer, a modified glass fiber base, modified asphalt and a high-molecular polymer film from top to bottom, and the modified glass fiber base is obtained by modifying the glass fiber base through an epoxy modified bonding agent. Through a multi-layer composite structure of the stainless steel foil, the epoxy modified bonding transition layer, the modified glass fiber base, the modified asphalt and the high-molecular polymer film, a chemically compatible and physically entangled reinforced interface is constructed, and the key problems that a traditional metal surface waterproof roll is weak in interlayer bonding and easy to peel off are cooperatively solved; the overall performance of the waterproof roll is remarkably improved.

Description

Technical Field

[0001] This disclosure relates to the field of waterproof materials technology, and in particular to a stainless steel foil-faced waterproof membrane, its preparation method and application. Background Technology

[0002] Waterproof membranes are a key waterproof barrier in building engineering, widely used in building roofs, walls, tunnels, roads, and landfills. Their core function is to block external rainwater from seeping in and prevent groundwater from seeping out, ensuring a sealed connection between the foundation and the building structure, which is crucial to the overall durability and safety of the project.

[0003] As the construction industry demands higher durability and reliability from waterproofing systems, the limitations of traditional modified bitumen waterproofing membranes are becoming increasingly apparent. They are prone to aging and cracking under harsh environments such as ultraviolet radiation and high temperatures (e.g., 60-80℃), and lack sufficient puncture and impact resistance. During construction or use, they are susceptible to waterproofing failure due to external damage. Currently, while reinforced waterproofing membranes with metal foil as the surface layer have emerged, they are prone to oxidation and damage in humid or salt spray environments. Furthermore, the bonding between the metal surface layer and the modified bitumen layer often relies on simple adhesive processes, resulting in insufficient interfacial bonding strength and a tendency for interlayer delamination, making it difficult to fully leverage the long-term protective advantages of the metal surface layer. Summary of the Invention

[0004] In view of the above, in order to at least partially solve at least one of the aforementioned technical problems, this disclosure provides a stainless steel foil-faced waterproof membrane, its preparation method and application, and the technical solution provided by this disclosure is as follows.

[0005] According to one embodiment of this disclosure, a stainless steel foil-faced waterproof membrane is provided, comprising, from top to bottom: a stainless steel foil, an epoxy-modified adhesive transition layer, a modified glass fiber base, modified bitumen, and a polymer film;

[0006] The modified glass fiber base is obtained by modifying the glass fiber base with an epoxy-modified adhesive.

[0007] According to another embodiment of this disclosure, a method for preparing a stainless steel foil-faced waterproof membrane is provided, comprising:

[0008] Step S1: Impregnate the glass fiber base with an epoxy-modified adhesive to obtain a modified glass fiber base;

[0009] Step S2: Coat the first surface of the modified glass fiber base with modified asphalt, compact it with a heated roller, and then cover the surface of the modified asphalt with a polymer film.

[0010] Step S3: Coat the second surface of the modified glass fiber base with epoxy modified adhesive, and attach the stainless steel foil to the surface of the epoxy modified adhesive. After pressing, cooling and shaping, and slitting and winding, a stainless steel foil waterproof membrane is obtained.

[0011] According to another embodiment of this disclosure, an application of a stainless steel foil-faced waterproof membrane in waterproofing projects is provided, wherein the stainless steel foil layer of the stainless steel foil-faced waterproof membrane can be directly used as an exposed waterproof layer.

[0012] Based on the above technical solution, the stainless steel foil-faced waterproof membrane, its preparation method, and its application disclosed herein have at least one of the following beneficial effects:

[0013] (1) In the technical solution disclosed herein, stainless steel foil is used as the face film layer. The chromium element in the stainless steel foil forms a dense chromium oxide film on the surface, which can effectively isolate oxygen, moisture and ultraviolet rays, thereby preventing the modified asphalt from photoaging and thermo-oxidative aging. Its high strength characteristics can resist the puncture of sharp objects and avoid damage to the roll material. In addition, the salt spray corrosion resistance of stainless steel foil is 8-10 times that of traditional aluminum foil, and its resistance to ultraviolet aging is 60% higher than that of traditional aluminum foil. At the same time, it also has excellent puncture resistance and impact resistance characteristics, and can be used directly as an exposed waterproof layer without the need for an additional protective layer.

[0014] (2) In the technical solution disclosed herein, the surface of the glass fiber base is treated with an epoxy modified adhesive, which can form a chemically compatible interface system with the epoxy modified adhesive transition layer above the modified glass fiber base, further enhancing the interlayer bonding force and structural integrity of the stainless steel foil waterproof membrane (hereinafter referred to as "waterproof membrane"), while improving the corrosion resistance and dimensional stability of the glass fiber base.

[0015] (3) In the technical solution disclosed herein, through the multi-layer functional design of “stainless steel foil-epoxy transition layer-modified base-modified bitumen”, the gradient matching and synergistic enhancement of the physical and chemical properties of each layer of materials are realized, so that the waterproof membrane has high puncture resistance, impact resistance and aging resistance. Detailed Implementation

[0016] The embodiments of this disclosure will now be described. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0017] Traditional modified bitumen waterproof membranes have gradually revealed their core defects in practical applications, which are manifested in two aspects: First, when polyester or ordinary glass fiber is used as the base material, the membrane is prone to aging and cracking when exposed to ultraviolet rays, high temperatures (such as 60-80℃) and acid and alkaline environments for a long time; Second, the surface of the membrane is mostly covered with polyethylene film or colored sand as a protective layer, which has insufficient puncture resistance and impact resistance, and is prone to failure of waterproof function due to damage from external mechanical forces during construction or long-term use.

[0018] Metal-faced waterproof membranes enhance the weather resistance and UV resistance of the membrane by laminating a very thin layer of metal foil (primarily aluminum foil) onto its surface. While these membranes offer improved performance compared to traditional bitumen membranes, several issues remain. For example, aluminum foil is relatively soft and weak, making it prone to oxidation and even perforation in humid, salt spray, or chemically corrosive environments. Its long-term weather resistance is far inferior to high-grade metals like stainless steel. Furthermore, the bond between the metal foil and the underlying bitumen layer relies heavily on simple hot-melt adhesives or the bitumen itself, resulting in weak interfacial chemical bonding. Under conditions of temperature variations, external impacts, or prolonged immersion, interlayer delamination can easily occur, leading to blistering and detachment of the metal surface layer, ultimately causing the entire waterproofing system to fail. In addition, aluminum foil has low hardness and insufficient puncture and impact resistance, making it easily scratched or punctured during construction, by foot traffic, impacts from gravel, or structural deformation, thus compromising the integrity of the waterproofing layer.

[0019] In view of this, this disclosure provides a stainless steel film waterproof membrane with stainless steel foil as the face film layer and modified glass fiber base as the reinforcing layer, and its preparation method. By optimizing the material ratio and process parameters, the membrane's weather resistance, mechanical properties, and construction performance are synergistically improved. Simultaneously, by developing an integrated composite process of "hot melt-roll pressing-constant temperature curing," an epoxy-modified adhesive transition layer is added between the stainless steel foil and the modified bitumen, working synergistically with the modified glass fiber base to effectively improve the problem of insufficient adhesion between the metal face film layer and the bitumen surface.

[0020] Specifically, according to one embodiment of this disclosure, a stainless steel foil-faced waterproof membrane is provided, comprising, from top to bottom: a stainless steel foil, an epoxy-modified adhesive transition layer, a modified glass fiber base, modified bitumen, and a polymer film, wherein the modified glass fiber base is obtained by modifying the glass fiber base with an epoxy-modified adhesive.

[0021] According to embodiments of this disclosure, a composite interface constructed through a multi-layer structure achieves a synergistic improvement in the overall performance of the waterproof membrane. The stainless steel foil, with its surface chromium oxide passivation film, provides excellent corrosion resistance, UV aging resistance, and mechanical damage resistance. An epoxy-modified adhesive transition layer (hereinafter referred to as the "transition layer") is combined with a modified glass fiber base (hereinafter referred to as the "modified base") treated in the same system, forming a chemically compatible reinforced interface between the stainless steel foil and the modified bitumen. This structure not only enables the transition layer to form chemical bonds with the active groups on the surface of the stainless steel foil, but also achieves fusion reinforcement with the underlying modified base at the interface, constructing a strong bonding system of "metal foil-transition layer-reinforcement layer-modified bitumen layer," thereby solving the problem of weak interlayer bonding and easy peeling failure caused by differences in material properties in traditional metal-faced waterproof membranes.

[0022] In some embodiments, the thickness of the stainless steel foil is 0.02-0.05 mm, for example, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, but not limited to the listed values. Stainless steel foil within this thickness range can maintain excellent mechanical strength, puncture resistance, and corrosion resistance while also ensuring the overall flexibility and lightweight of the waterproof membrane. This facilitates smooth installation and adhesion to complex substrates, and effectively controls costs. Preferably, the stainless steel foil is selected from 304 and 316 ultra-thin stainless steel foil (thickness 0.02-0.05 mm), whose salt spray corrosion resistance is 8-10 times that of aluminum foil, and its UV aging resistance is improved by 60%. It also possesses excellent puncture resistance and impact resistance, and can be used directly as an exposed waterproof layer without the need for an additional protective layer. The glass fiber base is selected from one of alkali-free glass fiber cloth, medium-alkali glass fiber cloth, or glass fiber needle-punched felt. Using the above-mentioned glass fiber base can provide the waterproof membrane with excellent dimensional stability, chemical corrosion resistance, and thermal stability. The polymer film is selected from polyethylene film, polypropylene film, and polyamide film. The polymer film can effectively block the penetration of underground water vapor, salt and other media, and protect the modified asphalt from bottom erosion.

[0023] According to embodiments of this disclosure, the epoxy-modified adhesive transition layer is formed by curing an epoxy-modified adhesive; the epoxy-modified adhesive is an epoxy-modified acrylate adhesive. The epoxy-modified adhesive provides flexibility through its acrylate segments, while relying on its epoxy groups to provide high reactivity and strong adhesion, forming a transition layer with excellent adhesion, flexibility, and aging resistance after curing. This transition layer can form stable chemical bonds with the hydroxyl groups on the surface of the stainless steel foil, thereby improving the peel resistance and environmental adaptability of the waterproof membrane.

[0024] According to embodiments of this disclosure, the modified bitumen comprises, by weight percentage: 60%-70% base bitumen, 10%-14% thermoplastic elastomer, 2%-6% nano-sized titanium dioxide, 3%-7% plasticizer, and 10%-15% inorganic filler. By introducing a composite modification system of nano-sized titanium dioxide and thermoplastic elastomer, where the nano-sized titanium dioxide reflects ultraviolet light and inhibits photo-oxidation of the modified bitumen, and the thermoplastic elastomer enhances the flexibility of the modified bitumen, the synergistic effect of the two enhances the modified bitumen's resistance to ultraviolet aging and its adaptability to high and low temperature deformation, thereby improving the durability of the waterproof membrane under long-term exposure to sunlight and temperature variations.

[0025] In some embodiments, the base asphalt is No. 70 or No. 200 asphalt, both of which have suitable softening points and can provide good adhesion while ensuring the flexibility and high-temperature stability (e.g., 60-80°C) of the modified asphalt. The thermoplastic elastomer is styrene-butadiene-styrene block copolymer (SBS), which can form a three-dimensional physical cross-linked network in the modified asphalt, significantly improving the elastic recovery ability of the modified asphalt. The plasticizer is selected from at least one of phthalates, naphthenic oils, or aromatic oils. The plasticizer can effectively improve the compatibility between the modified asphalt and the thermoplastic elastomer, enhance the compliance and low-temperature flexibility of the modified asphalt system, and promote the uniform dispersion of fillers in the system. Preferably, the plasticizer is dioctyl phthalate (DOP). The inorganic filler is selected from at least one of rubber powder, stone powder, or talc powder. The inorganic filler can improve the mechanical strength, dimensional stability, and resistance to deformation of the modified asphalt, and helps to optimize the rheological properties of the modified asphalt.

[0026] In some embodiments, a composite modification system of nano-sized titanium dioxide (TiO2) and styrene-butadiene-styrene block copolymer (SBS) is introduced. TiO2 reflects ultraviolet light through light scattering effect and inhibits the oxidative polymerization of asphaltenes in asphalt, thus delaying the embrittlement of the roll material. SBS, as an elastomer modifier, can form a three-dimensional network structure in the modified asphalt, improving the tensile strength and elastic recovery rate of the roll material. The synergistic effect of the two makes the roll material crack-free at -30°C and flow-free at 80°C. Preferably, the elastic modifier is a star-shaped styrene-butadiene-styrene block copolymer (star-shaped SBS).

[0027] In another embodiment of this disclosure, a method for preparing a stainless steel foil-faced waterproof membrane is provided, comprising steps S1-S3.

[0028] Step S1: Impregnate the glass fiber base with an epoxy modified adhesive to obtain a modified glass fiber base.

[0029] Step S2: The modified asphalt is coated on the first surface of the modified glass fiber base, and after being compacted by a heated roller, a polymer film is covered on the surface of the modified asphalt.

[0030] Step S3: Coat the second surface of the modified glass fiber base with epoxy modified adhesive, and attach the stainless steel foil to the surface of the epoxy modified adhesive. After pressing, cooling and shaping, and slitting and winding, a stainless steel foil waterproof membrane is obtained.

[0031] According to embodiments of this disclosure, by first modifying the glass fiber substrate to form a chemically compatible interface with the subsequent transition layer, a composite system of "stainless steel foil-transition layer-modified substrate-modified bitumen-base film" is constructed within the structure. This preparation method ensures that the epoxy-modified adhesive forms a continuous and stable transition layer between the stainless steel foil and the modified substrate, thereby achieving high-strength chemical bonding and physical entanglement between the metal surface layer and the modified bitumen. The preparation steps of this disclosure are simple and highly controllable, enabling uniform composite and interface optimization of each layer in continuous production, ultimately resulting in a waterproof membrane with strong interlayer adhesion, aging resistance, and puncture resistance.

[0032] According to an embodiment of this disclosure, step S1 includes: drying the glass fiber base at 125-135°C, impregnating it in an epoxy modified adhesive, and curing it at 85-95°C to obtain a modified glass fiber base.

[0033] According to embodiments of this disclosure, the glass fiber substrate is first subjected to high-temperature (125-135°C) drying treatment to effectively remove adsorbed moisture and volatile substances from its surface and interior, providing a clean and dry interface foundation for the subsequent full wetting and firm bonding of the epoxy-modified adhesive. Subsequently, curing is carried out at 85-95°C, promoting the formation of a stable and continuous coating layer of the epoxy-modified adhesive on the surface of the glass fiber substrate, achieving uniform modification of the chemical properties of the glass fiber substrate surface. The resulting modified substrate not only exhibits excellent chemical compatibility and interfacial fusion with the subsequently coated epoxy-modified adhesive, but also significantly enhances the water resistance and chemical resistance of the glass fiber substrate.

[0034] In some embodiments, the drying temperature of the glass fiber matrix can be 125°C, 126°C, 127°C, 128°C, 129°C, 130°C, 131°C, 132°C, 133°C, 134°C, or 135°C, but is not limited to the listed values. A suitable drying temperature ensures sufficient removal of adsorbed moisture and low-boiling-point volatiles from the glass fiber matrix, while avoiding damage to fiber properties due to excessively high temperatures. The curing temperature can be 85°C, 86°C, 87°C, 88°C, 89°C, 90°C, 91°C, 92°C, 93°C, 94°C, or 95°C, but is not limited to the listed values. This temperature window ensures both the speed and completeness of the curing reaction, while preventing damage to glass fiber properties due to excessively high temperatures (e.g., above 95°C), ensuring that the modified matrix possesses excellent interfacial activity, dimensional stability, and mechanical integrity, providing a reliable foundation for the subsequent robust composite of multilayer structures.

[0035] In some embodiments, the moisture content of the glass fiber substrate after drying is controlled at 0%-0.5%, for example, 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, but not limited to the listed values. Reasonable control of the moisture content ensures that the glass fiber substrate reaches an extremely low moisture content state before impregnation treatment, effectively preventing residual moisture from adversely affecting the curing of the epoxy modified adhesive and the interfacial bonding strength. It also reduces the generation of bubbles during subsequent curing, thereby ensuring the formation of a uniform and dense coating layer on the surface of the glass fiber substrate.

[0036] In some embodiments, the impregnation time of the epoxy-modified adhesive is 5-8 seconds, for example, 5 seconds, 6 seconds, 7 seconds, or 8 seconds, but not limited to the listed values. This impregnation time range ensures that the glass fiber substrate is fully and uniformly wetted by the epoxy-modified adhesive, effectively coating its surface and interfiber spaces. The amount of epoxy-modified adhesive applied is 10-15 g / m². 2 For example, it can be 10g / m 2 11g / m 2 12g / m 2 13g / m 2 14g / m 2 15g / m 2 However, the values ​​listed are not limited to these. An appropriate amount of adhesion can ensure sufficient chemical bonding and physical combination between the glass fiber base and the epoxy modified adhesive, while avoiding waste caused by excessive adhesion and problems such as increased curing stress or decreased flexibility of the waterproof membrane.

[0037] According to embodiments of this disclosure, the modified asphalt is prepared by the following method: after mixing the base asphalt with a thermoplastic elastomer, nano-sized titanium dioxide, plasticizer and inorganic filler are added in sequence to obtain the modified asphalt.

[0038] According to embodiments of this disclosure, thermoplastic elastomer is first mixed with molten matrix asphalt to allow it to swell fully and initially form a continuous network structure. Then, nano-sized titanium dioxide, plasticizer, and inorganic filler are added sequentially to gradually achieve filler coating and homogenization of the reaction system. This effectively avoids problems such as filler agglomeration and uneven distribution of thermoplastic elastomer, ensuring that the UV shielding function of nano-sized titanium dioxide, the toughening effect of thermoplastic elastomer, and the reinforcing effect of filler are synergistically utilized. Ultimately, a stable modified asphalt is obtained, ensuring the stability of the waterproof membrane under extreme temperature conditions from -30℃ to 80℃, thus adapting to the engineering needs of different climatic regions.

[0039] In some embodiments, the modified asphalt is prepared as follows: the base asphalt is heated to 165-175°C, the stirring rate is controlled at 300-500 r / min, and the mixture is kept at this temperature for 30 min to melt; then a thermoplastic elastomer is added, the temperature is raised to 180-190°C, and the stirring rate is increased to 800-1000 r / min, and the mixture is dispersed under this high-speed shear condition for 40-60 min to completely dissolve the thermoplastic elastomer in the base asphalt; then the temperature is lowered to 170-180°C, and nano-sized titanium dioxide, plasticizer and inorganic filler are added sequentially, the stirring rate is adjusted to 500-600 r / min, and the mixture is kept at this temperature and stirred for another 30-40 min to finally obtain the modified asphalt.

[0040] In some embodiments, the melting temperature of the base asphalt can be 165°C, 166°C, 167°C, 168°C, 169°C, 170°C, 171°C, 172°C, 173°C, 174°C, or 175°C, but is not limited to the listed values. This temperature range ensures that the base asphalt melts fully and achieves suitable fluidity, providing a good foundation for the uniform mixing of subsequent components, while avoiding uneven mixing due to excessively low temperatures (e.g., below 165°C) or premature aging of the base asphalt due to excessively high temperatures (e.g., above 175°C). The stirring rate during the base asphalt melting process can be 300 r / min, 350 r / min, 400 r / min, 450 r / min, or 500 r / min, but is not limited to the listed values. A suitable stirring rate ensures that the base asphalt is heated uniformly and melts rapidly, avoiding local overheating or coking, and also prevents excessive oxidation of the base asphalt or increased energy consumption due to excessively high stirring rates, providing a stable and uniform melt foundation for the smooth addition and dispersion of subsequent modified components.

[0041] In some embodiments, the heating temperature after adding the thermoplastic elastomer can be 180℃, 181℃, 182℃, 183℃, 184℃, 185℃, 186℃, 187℃, 188℃, 189℃, or 190℃, but is not limited to the listed values. A suitable temperature allows the thermoplastic elastomer to fully dissolve and swell in the base asphalt, forming a continuous three-dimensional network structure, thereby improving the elastic recovery ability of the modified asphalt. The stirring rate after adding the thermoplastic elastomer can be 800 r / min, 850 r / min, 900 r / min, 950 r / min, or 1000 r / min, but is not limited to the listed values; the dispersion time under high-speed shear conditions can be 40 min, 45 min, 50 min, 55 min, or 60 min, but is not limited to the listed values. A suitable stirring rate and stirring time can promote the full swelling and dispersion of the thermoplastic elastomer in the base asphalt, while avoiding uneven dispersion or agglomeration of the thermoplastic elastomer due to insufficient stirring.

[0042] In some embodiments, the cooling temperature can be 170℃, 171℃, 172℃, 173℃, 174℃, 175℃, 176℃, 177℃, 178℃, 179℃, or 180℃, but is not limited to the listed values. This temperature range provides a suitable processing window for the subsequent addition of nano-sized titanium dioxide, plasticizers, and inorganic fillers, ensuring sufficient dispersion of the fillers while avoiding decomposition of organic components or oxidation of the matrix asphalt due to excessively high temperatures (e.g., above 180℃). This rate range ensures uniform dispersion of nano-sized titanium dioxide, plasticizers, and inorganic fillers while avoiding filler agglomeration or excessive oxidation of the asphalt system due to excessively high shear rates. The stirring rate after adding the filler can be 500 r / min, 550 r / min, or 600 r / min, but is not limited to the listed values. The stirring time after adding the filler can be 30 min, 35 min, or 40 min, but is not limited to the listed values. This time range ensures that the filler is fully wetted and evenly distributed in the asphalt matrix, and forms a stable composite structure with the asphalt and elastomer, thereby improving the mechanical properties and functional stability of the modified asphalt.

[0043] In some embodiments, the coating thickness of the modified bitumen is 1.5-2.5 mm, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, but not limited to the listed values. This thickness range optimizes the overall weight and material cost while ensuring sufficient impermeability, durability, and mechanical strength of the waterproof membrane. The coating thickness of the epoxy modified adhesive is 0.15-0.25 mm, for example, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, but not limited to the listed values. This thickness range allows the epoxy-modified adhesive to form a uniform, continuous, and sufficient transition layer between the stainless steel foil and the modified substrate, achieving both sufficient chemical bonding and physical bonding with the materials on both sides, while avoiding increased internal stress or cost waste due to excessive thickness.

[0044] According to another aspect of this disclosure, an application of a stainless steel foil-faced waterproof membrane in waterproofing projects is provided, wherein the stainless steel foil surface of the waterproof membrane can be directly used as an exposed waterproof layer.

[0045] In some embodiments, the waterproof membrane disclosed herein exhibits excellent comprehensive performance. For example, in terms of tensile properties, its tensile strength can reach 920-1050 / 50mm, and its elongation at break is 35%-45%; in terms of low-temperature flexibility, it does not crack when bent at -30℃; in terms of high-temperature resistance, the coating does not flow or drip at 80℃; in terms of interfacial adhesion, its interfacial peel strength with the substrate reaches 3.8-4.5 N / mm; and in terms of corrosion resistance, it shows no rust after immersion in 5% sodium chloride solution for 500-700 hours.

[0046] In summary, the stainless steel foil-faced waterproof membrane disclosed herein, through systematic material design and structural innovation, achieves a significant improvement in the comprehensive performance and application benefits of waterproof membranes. Using stainless steel foil as the face film extends the UV aging resistance of the waterproof membrane to 15-20 years (compared to 8-10 years for traditional products), increases its puncture resistance to 1200N (compared to 600-800N for traditional products), and allows for rust-free application after immersion in a 5% sodium chloride solution for 500-700 hours, reducing the cost of subsequent protective layer construction. Through an integrated composite process of "hot-melt-roll pressing-constant temperature curing," an epoxy-modified adhesive transition layer is added between the stainless steel foil and modified bitumen, working synergistically with the modified base material. This effectively solves the interface adhesion problem in traditional step-by-step construction, achieving an interface peel strength of 3.8-4.5N / mm (40% higher than traditional processes), increasing the product qualification rate to over 99% (compared to approximately 90% for traditional processes), improving production efficiency by 20%, and effectively reducing the cost of large-scale production. Meanwhile, the waterproof membrane disclosed herein possesses characteristics such as high strength, corrosion resistance, and wide temperature range stability, which can simultaneously meet the needs of various scenarios such as roofs (exposed), green roofs (root penetration resistance), and underground projects (moisture resistance), without requiring formula adjustments for different scenarios, thus reducing inventory pressure for enterprises. Furthermore, the introduction of nano-level titanium dioxide into the modified bitumen inhibits photo-aging of the modified bitumen and reduces the release of harmful gases, extending the service life of the waterproof system, reducing the total life-cycle maintenance cost, and meeting the requirements of green building and sustainable development.

[0047] The present disclosure will be described in detail below with reference to specific embodiments. It should be noted that the described embodiments are merely some, not all, of the embodiments of the present disclosure. Other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative effort are all within the scope of protection of the present disclosure.

[0048] The tensile test, elongation at break test, low temperature flexibility test, heat resistance test, and peel strength test of the waterproof membrane disclosed herein are all determined in accordance with the requirements of GB / T 18242 "Elastomer Modified Bituminous Waterproof Membrane"; the salt spray corrosion resistance test is determined in accordance with the requirements of GB / T 10125 "Artificial Atmosphere Corrosion Test - Salt Spray Test".

[0049] The material performance parameters used in the embodiments of this disclosure are as follows:

[0050] Glass fiber base: Alkali-free glass fiber woven fabric, unit area mass 100-120g / m², tensile strength ≥800N / 50mm.

[0051] 304 stainless steel foil: thickness 0.02-0.05mm, surface roughness Ra=0.8-1.6μm.

[0052] 316 stainless steel foil: thickness 0.02-0.1mm, surface roughness Ra=0.8-2.5μm.

[0053] Epoxy-modified acrylate adhesive: solid content 60-70%, viscosity 2000-3000 mPa•s, room temperature curing time ≤24h.

[0054] Base asphalt: Shandong Jingbo Petrochemical Co., Ltd., No. 70 base asphalt.

[0055] SBS: Beijing Yanshan Branch of China Petroleum & Chemical Corporation, SBS4402, star-shaped SBS.

[0056] Nanoscale titanium dioxide: Ningbo Jiwei Nano New Materials Technology Co., Ltd., with a particle size of 5-80nm.

[0057] Plasticizer: Dioctyl phthalate, Zhongshan Liancheng Chemical Industry Co., Ltd., color ≤25, flash point ≥198℃, density 0.982-0.986 g / cm³ 3 .

[0058] Inorganic filler: Jinshan Calcium Industry Co., Ltd., Yinan County, Shandong Province, 200 mesh stone powder.

[0059] Example 1

[0060] 1. Raw material ratio: 66 parts base asphalt, 12 parts SBS, 4 parts nano-grade titanium dioxide, 5 parts plasticizer, 13 parts inorganic filler; glass fiber base (110g / m²) 2 ); 304 stainless steel foil (thickness 0.05mm); epoxy modified acrylate adhesive (solid content 65%).

[0061] 2. Preparation process:

[0062] Preparation of modified asphalt: The base asphalt was heated to 165℃ to melt, and then SBS was added after the temperature was raised to 180℃. The mixture was then subjected to high-speed shearing for 50 minutes to fully disperse and dissolve the asphalt. The temperature was then lowered to 170℃ and nano-sized titanium dioxide, plasticizer and inorganic filler were added in sequence. The mixture was stirred continuously for 35 minutes to obtain uniform modified asphalt.

[0063] Pretreatment of the base material: The glass fiber base material is dried at 125℃ for 15 minutes, then impregnated in epoxy modified acrylate adhesive, and then cured at 85℃ for 12 minutes to obtain the modified base material.

[0064] Composite molding: Modified asphalt is coated on one side of the modified base material with a coating thickness of 1.8 mm. After being compacted by a roller heated to 170°C, a polyethylene film is covered on the other surface of the modified asphalt while it is still hot. An epoxy-modified acrylate adhesive is coated on the other side of the modified base material as a transition layer with a coating thickness of 0.15 mm. Then, 304 stainless steel foil is attached to the surface of the transition layer and pressed at 105°C and 0.4 MPa. After being cooled at 30°C for 25 seconds to set, it is cut into waterproof membranes with a specification of 1000 mm × 10 m.

[0065] 3. Performance testing: The tensile strength of the obtained waterproof membrane is 920 N / 50 mm, the elongation at break is 35%, there are no cracks when bent at -30℃, the coating material does not flow or drip at 80℃, the interfacial peel strength is 3.8 N / mm, and there is no rust after 500 h of salt spray corrosion resistance test in 5% NaCl solution.

[0066] Example 2

[0067] 1. Raw material ratio: 64 parts base bitumen, 12 parts SBS, 4 parts nano-grade titanium dioxide, 5 parts plasticizer, 15 parts inorganic filler; glass fiber base (120g / m²) 2 316 stainless steel foil (thickness 0.1mm); epoxy modified acrylate adhesive (solid content 70%).

[0068] 2. Preparation process:

[0069] Preparation of modified asphalt: The base asphalt was heated to 170℃ to melt, and then SBS was added after the temperature was raised to 185℃. The mixture was then subjected to high-speed shearing for 60 minutes to fully disperse and dissolve the asphalt. The temperature was then lowered to 175℃ and nano-sized titanium dioxide, plasticizer and inorganic filler were added in sequence. The mixture was stirred continuously for 40 minutes to obtain uniform modified asphalt.

[0070] Pretreatment of the base material: The glass fiber base material is dried at 130℃ for 20 minutes, then impregnated in epoxy modified acrylate adhesive, and then cured at 90℃ for 15 minutes to obtain the modified base material.

[0071] Composite molding: Modified asphalt is coated on one side of the modified base material with a coating thickness of 2.0 mm. After being compacted by a roller heated to 170°C, a polyethylene film is covered on the other surface of the modified asphalt while it is still hot. An epoxy-modified acrylate adhesive is coated on the other side of the modified base material as a transition layer with a coating thickness of 0.2 mm. Then, 316 stainless steel foil is attached to the surface of the transition layer and pressed at 110°C and 0.5 MPa. After being cooled at 35°C for 30 seconds to set, it is cut into waterproof membranes with a specification of 1000 mm × 10 m.

[0072] 3. Performance testing: The tensile strength of the obtained waterproof membrane is 980 N / 50 mm, the elongation at break is 38%, there are no cracks when bent at -30℃, the coating material does not flow or drip at 80℃, the interfacial peel strength is 4.2 N / mm, and there is no rust after 600 h of salt spray corrosion resistance test in 5% NaCl solution.

[0073] Example 3

[0074] 1. Raw material ratio: 60 parts base bitumen, 14 parts SBS, 5 parts nano-grade titanium dioxide, 6 parts plasticizer, 15 parts inorganic filler; glass fiber base (120g / m²) 2 316 stainless steel foil (thickness 0.1mm); epoxy modified acrylate adhesive (solid content 70%).

[0075] 2. Preparation process:

[0076] Preparation of modified asphalt: The base asphalt was heated to 175℃ to melt, and then SBS was added after the temperature was raised to 190℃. The mixture was then subjected to high-speed shearing for 60 minutes to fully disperse and dissolve the asphalt. The temperature was then lowered to 180℃ and nano-sized titanium dioxide, plasticizer and inorganic filler were added in sequence. The mixture was stirred continuously for 45 minutes to obtain uniform modified asphalt.

[0077] Pretreatment of the base material: The glass fiber base material is dried at 135℃ for 25 minutes, then impregnated in epoxy modified acrylate adhesive, and then cured at 95℃ for 18 minutes to obtain the modified base material.

[0078] Composite molding: Modified asphalt is coated on one side of the modified base with a coating thickness of 2.2mm. After being compacted by a roller heated to 170℃, a polyethylene film is covered on the other surface of the modified asphalt. An epoxy-modified acrylate adhesive is coated on the other side of the modified base as a transition layer with a coating thickness of 0.25mm. Then, 316 stainless steel foil is attached to the surface of the transition layer and pressed at 115℃ and 0.6MPa. After being cooled at 40℃ for 40s to set, it is cut into waterproof membranes with a specification of 1000mm×10m.

[0079] 3. Performance testing: The tensile strength of the obtained waterproof membrane is 1050N / 50mm, the elongation at break is 41%, there are no cracks when bent at -30℃, the coating material does not flow or drip at 80℃, the interfacial peel strength is 4.5N / mm, and there is no rust after 700h salt spray corrosion test in 5% NaCl solution.

[0080] Comparative Example 1

[0081] 1. Raw material ratio: 65 parts base asphalt, 14 parts SBS, 6 parts plasticizer, 9 parts inorganic filler; glass fiber base (120g / m²) 2), aluminum foil (thickness 0.12mm).

[0082] 2. Preparation process:

[0083] Preparation of modified asphalt: The base asphalt was heated to 175℃ to melt, and then SBS was added after the temperature was raised to 190℃. It was then subjected to high-speed shearing for 60 minutes to fully disperse and dissolve it. The temperature was then lowered to 180℃ and plasticizer and inorganic filler were added in sequence. The mixture was stirred continuously for 45 minutes to obtain uniform modified asphalt.

[0084] Pretreatment of the base material: Dry the glass fiber base material at 135℃ for 25 minutes.

[0085] Composite molding: Modified bitumen is coated on one side of the glass fiber base with a coating thickness of 2.2mm. After being compacted by a roller heated to 170℃, a polyethylene film is covered on the other surface of the modified bitumen while it is still hot. An epoxy-modified acrylate adhesive is coated on the other side of the glass fiber base as a transition layer with a coating thickness of 0.25mm. Then, aluminum foil is attached to the surface of the transition layer and pressed at 115℃ and 0.6MPa. After being cooled at 40℃ for 40s to set the shape, it is cut into waterproof membranes with a specification of 1000mm×10m.

[0086] 3. Performance testing: The tensile strength of the obtained waterproof membrane is 750 N / 50 mm, the elongation at break is 25%, there are no cracks when bent at -30℃, the coating slips by 0.3 mm at 80℃, the interfacial peel strength is 2.2 N / mm, and rusting occurs after 300 h of salt spray corrosion resistance test in 5% NaCl solution.

[0087] This disclosure utilizes stainless steel foil as the face film layer, whose dense chromium oxide passivation layer provides excellent corrosion resistance. No rust was observed in a 500-700h salt spray corrosion test, significantly improving corrosion resistance compared to traditional aluminum foil face film layers. Simultaneously, an epoxy-modified adhesive is used to treat the glass fiber base and construct a transition layer, forming a chemical bond with the stainless steel foil surface and achieving physical entanglement with the modified bitumen. This significantly enhances interlayer bonding strength, achieving an interfacial peel strength of 3.8-4.5 N / mm, effectively addressing the problems of insufficient adhesion and easy peeling between traditional metal face film layers and modified bitumen. Furthermore, the introduction of nano-sized titanium dioxide into the modified bitumen effectively inhibits thermal oxidative aging of the modified bitumen through its UV shielding effect, further improving the high-temperature stability and long-term weather resistance of the waterproof membrane.

[0088] In summary, the stainless steel foil-faced waterproof membrane, its preparation method, and its application disclosed herein, through systematic material design and structural innovation, achieve a synergistic improvement in surface corrosion resistance, interface strengthening, and overall functionality of the waterproof membrane. The use of stainless steel foil significantly enhances the corrosion resistance and mechanical strength of the waterproof membrane; the epoxy-modified adhesive treatment of the glass fiber base and the construction of the transition layer form a strong interface system with synergistic chemical bonding and physical entanglement; the introduction of nano-sized carbon dioxide peptides into the modified bitumen further enhances the high-temperature stability and anti-aging properties of the waterproof membrane. This product combines advantages such as corrosion resistance, wide temperature range adaptability, and versatility in multiple scenarios. While extending the service life of the waterproof membrane and reducing maintenance costs, it aligns with the industry trends of green building and sustainable development, providing a reliable technical path for the development and application of high-performance waterproof membranes.

[0089] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A stainless steel foil-faced waterproof membrane, characterized in that, From top to bottom, it includes: stainless steel foil, epoxy modified adhesive transition layer, modified glass fiber base, modified asphalt, and polymer film; The modified glass fiber base is obtained by modifying the glass fiber base with an epoxy-modified adhesive.

2. The stainless steel foil-faced waterproof membrane according to claim 1, characterized in that, The thickness of the stainless steel foil is 0.02-0.05 mm; The glass fiber substrate is selected from one of alkali-free glass fiber cloth, medium-alkali glass fiber cloth or glass fiber needle-punched felt. The polymer film is selected from one of polyethylene film, polypropylene film, and polyamide film.

3. The stainless steel foil-faced waterproof membrane according to claim 2, characterized in that, The epoxy-modified adhesive transition layer is formed by curing an epoxy-modified adhesive; The epoxy-modified adhesive is an epoxy-modified acrylate adhesive.

4. The stainless steel foil-faced waterproof membrane according to claim 1, characterized in that, The modified asphalt comprises the following components by weight percentage: 60%-70% base asphalt, 10%-14% thermoplastic elastomer, 2%-6% nano-grade titanium dioxide, 3%-7% plasticizer, and 10%-15% inorganic filler.

5. The stainless steel foil-faced waterproof membrane according to claim 4, characterized in that, The base asphalt is No. 70 asphalt or No. 200 asphalt; The thermoplastic elastomer is a styrene-butadiene-styrene block copolymer; The plasticizer is selected from at least one of phthalates, naphthenic oils, or aromatic oils; The inorganic filler is selected from at least one of adhesive powder, stone powder or talc powder.

6. A method for preparing a stainless steel foil-faced waterproof membrane, characterized in that, include: Step S1: Impregnate the glass fiber base with an epoxy-modified adhesive to obtain a modified glass fiber base; Step S2: Coat the first surface of the modified glass fiber base with modified asphalt, compact it with a heated roller, and then cover the surface of the modified asphalt with a polymer film. Step S3: Coat the second surface of the modified glass fiber base with an epoxy modified adhesive, and attach the stainless steel foil to the surface of the epoxy modified adhesive. After pressing, cooling and shaping, and slitting and winding, the stainless steel foil waterproof membrane is obtained.

7. The preparation method according to claim 6, characterized in that, Step S1 includes: drying the glass fiber base at 125-135°C, impregnating it in the epoxy modified adhesive, and curing it at 85-95°C to obtain the modified glass fiber base.

8. The preparation method according to claim 7, characterized in that, The method for preparing the modified asphalt includes: mixing base asphalt with thermoplastic elastomer, and then sequentially adding nano-sized titanium dioxide, plasticizer and inorganic filler to obtain the modified asphalt.

9. The preparation method according to claim 6 or 8, characterized in that, The coating thickness of the modified asphalt is 1.5-2.5 mm; The coating thickness of the epoxy modified adhesive is 0.15-0.25 mm.

10. The application of a stainless steel foil-faced waterproof membrane as described in any one of claims 1 to 5 in waterproofing projects, characterized in that, The stainless steel foil layer of the stainless steel foil-faced waterproof membrane can be used directly as an exposed waterproof layer.