Ultralow-temperature modified asphalt waterproof coiled material

Abstract

The invention relates to the technical field of road engineering and building protection materials, and discloses an ultralow-temperature modified asphalt waterproof coiled material which comprises the following components in parts by weight: 50-70 parts of No.70 matrix asphalt and Venezuela asphalt; 10 to 25 parts of an elastomer blending modifier; the invention also provides a preparation method of the ultralow-temperature modified asphalt waterproof coiled material, and the preparation method comprises the following steps: S1, material pretreatment: uniformly mixing the No.70 matrix asphalt with the Venezuela asphalt and the elastomer blending modifier to form an asphalt base material with proper processing performance; and S2, nano-filling reinforcement: introducing a nano-filling reinforcement component into the modified asphalt. By introducing a nanometer enhancement technology, multi-layer composite structure optimization and macromolecule modification, the low-temperature flexibility, weather resistance and structural stability of the material are improved, and balance optimization of long-term durability and comprehensive performance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering and building protection materials, and particularly to a super-low temperature modified asphalt waterproof coiled material. Background Art

[0002] In many fields such as road construction, waterproof engineering, and bridge paving, asphalt-based materials play a crucial role. Whether it is road paving in cold regions or protective structures exposed outdoors for a long time, strict requirements are imposed on the durability, stability, and environmental adaptability of the materials. Factors such as extreme weather, ultraviolet aging, and load effects will affect the service life of the materials, leading to problems such as structural failure, cracking, and aging. Therefore, developing a modified asphalt material that can simultaneously possess low-temperature crack resistance, excellent weather resistance, and good structural stability has become the core requirement.

[0003] The prior art has made many breakthroughs in the field of modified asphalt and is widely used in road and construction projects. By adding elastomers, toughening agents, and specific mineral filling materials, the asphalt materials have, to a certain extent, good flexibility and structural strength. At the same time, the application of polymer modification technology enables the asphalt to have good fatigue resistance and durability within a certain temperature range. In addition, some technical solutions have improved the adhesion performance and water resistance of the materials through specific surface treatment processes, enabling them to maintain relatively stable physical properties under certain humidity and temperature changes.

[0004] However, there are still some deficiencies in the current technology; firstly, the crack resistance at low temperatures remains a shortcoming. Even with the introduction of elastomer modification, in extremely cold conditions, the rigidity of the material increases, resulting in easier formation of cracks and inability to withstand severe cold conditions for a long time; secondly, traditional materials are prone to aging under long-term ultraviolet irradiation, and the surface layer gradually powders and cracks, reducing the overall protection ability and affecting long-term use; in addition, single-layer asphalt materials are prone to deformation under temperature and humidity changes or long-term load effects, especially in an environment where high temperature and humidity alternate, irreversible warping or microscopic damage is likely to occur, affecting later use; finally, some modification technologies often sacrifice other important characteristics while improving a single performance. For example, while enhancing the low-temperature crack resistance, the durability and weather resistance decrease, making the material unable to meet comprehensive requirements. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a super-low temperature modified asphalt waterproof coiled material, which solves the problems of the prior art in terms of insufficient low-temperature crack resistance, weather resistance, structural stability, and balance of comprehensive performance.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: a super-low temperature modified asphalt waterproof coil, and the waterproof coil comprises the following components in parts by weight:

[0007] 70# base asphalt and Venezuelan asphalt: 50 - 70 parts. The 70# base asphalt has a moderate softening point and good processing performance, but it is brittle at low temperatures, which affects the flexibility of the coil. Venezuelan asphalt belongs to natural asphalt, rich in aromatic compounds and asphaltenes, which can effectively reduce the temperature sensitivity of the coil, improve the low-temperature crack resistance and anti-aging performance. When these two kinds of asphalt are used in combination, Venezuelan asphalt can effectively compensate for the brittleness of the 70# base asphalt at low temperatures, improve the low-temperature flexibility of the coil, and make it show better crack resistance in cold environments;

[0008] Elastomer blend modifier: 10 - 25 parts;

[0009] Nano-filled reinforcing component: 2 - 10 parts;

[0010] Epoxidized soybean oil: 2 - 6 parts. As a plasticizer and stabilizer, epoxidized soybean oil can improve the dispersion state of the polymer matrix, enhance the fluidity of molecular chains, thereby reducing the low-temperature brittleness and improving the low-temperature construction adaptability of the coil. At the same time, it can inhibit the generation of free radicals during the aging process of asphalt, delay the oxidation degradation reaction, improve the weather resistance, and has a compatibilizing effect on the elastomer blend modifier, which can reduce the phase separation phenomenon, make the modified system more uniform and stable, and extend the service life of the coil;

[0011] Polyetheramine: 1 - 4 parts. The flexible chain segment of polyetheramine can provide additional molecular chain slip ability at low temperatures, further reduce the embrittlement temperature of the coil, and improve its low-temperature flexibility. The amino group can form hydrogen bonds or chemical bonds with the surface of the nano-filled reinforcing component, improve the dispersion of nano-particles, and at the same time enhance the interfacial interaction between the modified asphalt and the tire base fabric and filler, and has the function of delaying material aging and improving the durability of the coil;

[0012] Interface optimization aid: 1 - 5 parts.

[0013] Preferably, the elastomer blend modifier comprises:

[0014] SBS (styrene-butadiene-styrene): 10 - 25 parts; SBS has an ABA-type block copolymer structure, where the styrene (S) end groups provide rigid support, and the butadiene (B) middle chain segments endow rubber elasticity, which can effectively improve the toughness and impact resistance of the modified asphalt. In the modified asphalt system, SBS forms a physical cross-linking network to enhance the elastic recovery ability of asphalt, effectively improve its crack resistance, and prevent the coil from cracking under low-temperature conditions;

[0015] SEBS (Hydrogenated Styrene-Butadiene-Styrene): 5 - 15 parts. The double bonds in butadiene of SBS are prone to oxidative degradation, leading to material aging. However, the hydrogenated structure of SEBS improves its anti-ultraviolet aging and heat-oxidation resistance properties, extending the service life of the waterproofing membrane; improving the stability of the asphalt system: SEBS is not easily decomposed in the asphalt matrix and can maintain a stable phase state during long-term, high-temperature storage and construction processes, avoiding phase separation and improving the uniformity of the system.

[0016] SIS (Styrene-Isoprene-Styrene): 5 - 10 parts. The glass transition temperature (Tg) of SIS is lower than that of SBS and SEBS (usually around -60°C), which enables the membrane to maintain sufficient flexibility and elasticity in extremely low-temperature environments, preventing low-temperature embrittlement. At the same time, SIS also has relatively high cohesion, enabling the membrane to better bond with the base material (such as polyester base fabric, fiberglass mesh fabric), improving the interface stability. Finally, the high elasticity of SIS can enhance the impact resistance of the waterproofing membrane, enabling it to better adapt to external forces during construction and reducing the risk of damage.

[0017] Preferably, the nano-filled reinforcing component includes:

[0018] Nano-SiO₂: 1 - 5 parts. The micron-level bridging effect of nano-SiO₂ can improve the adhesion force inside the matrix, making the overall structure of the modified asphalt more stable and enhancing the tensile strength; due to the large number of hydroxyl groups (-OH) on the surface of nano-SiO₂, it can interact with polar functional groups (such as carboxyl groups, hydroxyl groups) in asphalt to form hydrogen bonds or van der Waals forces, improving the adhesion and shear resistance of the material and reducing the temperature sensitivity; in low-temperature environments, the high-rigidity filling effect of nano-SiO₂ can reduce the shrinkage of the material, improving the low-temperature resistance of the waterproofing membrane and enabling it to still have excellent flexibility and mechanical stability under extremely cold conditions.

[0019] Nano-montmorillonite: 2 - 6 parts. The intercalatable structure between the layers of nano-montmorillonite can adsorb polar components in asphalt, improving the compatibility and thus enhancing the overall anti-delamination ability to prevent the occurrence of low-temperature cracking; due to the interlayer structure of montmorillonite that can accommodate a large number of polar groups, the nano-composite system formed in the asphalt matrix can effectively improve the water resistance and chemical corrosion resistance of the material, enhancing the service life of the waterproofing membrane; the interlayer slip characteristics of nano-montmorillonite endow the waterproofing membrane with better low-temperature flexibility to a certain extent, enabling it to still maintain good deformation ability under low-temperature impact and avoiding brittle failure.

[0020] Nano rubber particles: 2 - 6 parts. The rubber particles can form a "flexible phase" in the asphalt matrix, increasing the elastic modulus of the material, enabling the waterproofing membrane to maintain a certain toughness at low temperatures and reducing the risk of brittle cracking. Due to their small size, the nano rubber particles can be evenly distributed in the matrix to form a "microscopic reinforcement network", which can effectively buffer energy when subjected to external stress, improving the fracture toughness and impact resistance of the material. Their good compatibility with the asphalt matrix can reduce the phase separation phenomenon between the rubber phase and the asphalt phase, thereby enhancing the overall stability and delaying the aging process of the material.

[0021] Fluorinated graphene: 0.5 - 2 parts. Fluorinated graphene can significantly improve the hydrophobicity of asphalt, reduce water penetration, and enhance the anti-hydrothermal aging ability of the waterproofing membrane. Its ultra-thin layered structure can enhance the interlayer force of the matrix, improve the mechanical strength of the waterproofing membrane, and at the same time enhance its anti-peeling performance. Since the surface of fluorinated graphene contains fluorine elements, it has an extremely low surface energy, which can effectively inhibit the formation of ice crystals, enabling the waterproofing membrane to still have good anti-freezing performance in low-temperature environments and avoiding the occurrence of low-temperature brittle cracking problems. In addition, the high thermal conductivity of fluorinated graphene can improve the thermal stability of the material, enabling the membrane to maintain excellent weather resistance within a large temperature difference range.

[0022] Preferably, the interface optimization aid includes:

[0023] Maleic anhydride grafted SBS: 1 - 5 parts. The carboxyl or anhydride groups in the maleic anhydride structure can chemically react with polar components in asphalt (such as phenolic hydroxyl groups and carboxyl groups in asphalt), improving the uniform dispersion of SBS in the asphalt matrix, thereby optimizing the phase interface of the composite material. SBS itself has excellent elasticity, but without modification, its compatibility with asphalt is poor. After MAH grafting, strong interactions are formed between its molecular chains and the polar molecular chains in asphalt, improving the flexibility and low-temperature resistance of the material.

[0024] Polyether-modified siloxane: 0.2 - 1 part. The siloxane main chain gives the material a low surface energy, enhancing the overall wettability of the modified asphalt system, thereby promoting the uniform distribution of fillers (such as nano-SiO2, fluorinated graphene, etc.) and polymer components in the asphalt matrix and improving the interfacial bonding force. The presence of polyether side chains endows siloxane with good flexibility and can reduce the glass transition temperature (Tg) of the material, effectively preventing the material from brittle cracking in ultra-low temperature environments, improving the cold resistance and ductility of the membrane. At the same time, siloxane has excellent hydrophobicity, enabling the material to still maintain good stability in a long-term humid environment, reducing the aging and performance degradation of asphalt, and improving the durability of the waterproofing membrane.

[0025] The present invention also provides a preparation method for a super-low temperature modified asphalt waterproofing membrane, including the following steps:

[0026] S1. Material pretreatment: By uniformly mixing No. 70 base asphalt with Venezuelan asphalt and an elastomeric blend modifier, an asphalt base material with suitable processing properties is formed.

[0027] S2. Nano-fill reinforcement: By introducing nano-fill reinforcement components into the modified asphalt and making them uniformly dispersed, a modified asphalt matrix is formed.

[0028] S3. Dynamic crosslinking optimization: A stable polymer network is formed through crosslinking.

[0029] S4. Preparation of layered composite structure: Used to combine different performance layers so that the formed coil structure has multiple functions simultaneously.

[0030] S5. Hot pressing and forming: Used to make the composite material bond tightly by controlling temperature and pressure and form the required coil shape.

[0031] Preferably, the material pretreatment includes:

[0032] Mix No. 70 base asphalt with Venezuelan asphalt and heat to 140 - 160 °C, stir until uniform. The temperature range of 140 - 160 °C helps reduce the viscosity of the asphalt, making it easier to mix and ensuring that the two asphalts can be fully fused. The stirring process helps ensure that the asphalt is fully mixed at a uniform temperature, avoiding stratification or non-uniformity.

[0033] Add SBS, SEBS, SIS elastomers, heat up to 180 - 200 °C, and perform high-shear dispersion with a shear rate of 3000 - 5000 rpm, and continuously stir for 40 - 60 min. Shear dispersion helps break large-molecular-weight elastomers into smaller particles, thereby enhancing their compatibility with the asphalt matrix. The purpose of high-shear stirring is to overcome the compatibility problem between the elastomer and the asphalt matrix, ensure their uniform dispersion, and avoid particle aggregation in the final product. The temperature range of 180 - 200 °C makes the viscosity of the asphalt moderate, which is beneficial to improving the dispersion effect of the elastomer and avoiding degradation of the elastomer caused by too high a temperature. And continuously stirring for 40 - 60 minutes ensures sufficient mixing and dispersion, promoting the interaction between different components.

[0034] Preferably, the nano-fill reinforcement includes:

[0035] Gradually add nano-SiO2, nano-montmorillonite, nano-rubber particles, and fluorinated graphene, and use ultrasonic assistance for dispersion. The ultrasonic frequency is 20 - 40 kHz, and the treatment time is 10 - 20 min. The mechanism of ultrasonic-assisted dispersion is through the acoustic cavitation effect generated by high-frequency sound waves in the asphalt, forming tiny bubbles on the surface of the filler and quickly rupturing, thereby dispersing the filler into the asphalt matrix. In this way, nano-scale fillers can be effectively dispersed in the asphalt without forming large agglomerates or aggregations.;

[0036] Continue stirring for 30 - 40 min to evenly disperse the filler in the asphalt matrix. Continuing to stir for 30 - 40 min is to ensure that all nano-fillers are evenly distributed in the asphalt, thereby ensuring consistent performance of the entire waterproof coiled material.

[0037] Preferably, the dynamic crosslinking optimization includes:

[0038] Add maleic anhydride-grafted SBS and polyether-modified siloxane to the modified asphalt matrix and stir for 30 - 50 min. Maleic anhydride-grafted SBS improves the affinity of SBS through interaction with molecules in the asphalt matrix, promotes chemical bonding between SBS and the asphalt matrix, and avoids uneven dispersion caused by incompatibility between SBS and the asphalt matrix;

[0039] Conduct thermal crosslinking treatment at a heating temperature of 190 - 210 °C for 30 - 60 min. Components such as maleic anhydride-grafted SBS and polyether-modified siloxane generate covalent bonds through pyrolysis or reaction within this temperature range and this duration range, enhancing the intermolecular interaction force. This process helps improve the thermal stability, elasticity, and durability of the asphalt;

[0040] Adopt ultraviolet crosslinking treatment with a wavelength of 300 - 400 nm for 20 - 40 min to enhance the structural stability. Ultraviolet radiation breaks the chemical bonds in the molecules and promotes free radical reactions within the molecules to form new crosslinking points. The wavelength range of 300 - 400 nm of ultraviolet light can effectively excite the chemical substances in the asphalt, especially SBS and siloxane-modified molecules, promoting their crosslinking reaction and enhancing the strength and stability between molecules.

[0041] Preferably, the preparation of the layered composite structure includes:

[0042] An additional crosslinked modified asphalt is coated on the surface of the asphalt matrix as a transition layer, with a controlled thickness of 0.5 - 1.5 mm. The transition layer formed by coating the crosslinked asphalt plays a bridging role between the asphalt matrix and the reinforcing layer, avoiding interface detachment or uneven performance caused by direct contact. In addition, controlling the thickness of the transition layer within 0.5 - 1.5 mm helps to balance the mechanical properties between the transition layer and other layers, ensuring the durability of the waterproof coiled material during use;

[0043] A reinforcing layer is laid on the transition layer. The reinforcing layer includes a polyester base fabric or a fiberglass mesh fabric, and pressure is applied to make it adhere to the transition layer. Reinforcing materials such as polyester base fabric or fiberglass mesh fabric have excellent mechanical strength and durability. By applying pressure to make it adhere tightly to the transition layer, the tensile strength and stability of the entire coiled material are enhanced. The arrangement form of these reinforcing layer materials can provide uniform mechanical distribution, preventing local rupture or deformation of the coiled material when subjected to external forces;

[0044] A second layer of crosslinked modified asphalt is coated on the reinforcing layer, with a controlled thickness of 0.5 - 1.5 mm, ensuring uniform coating of the material. The coated crosslinked asphalt can further improve the waterproof performance and anti-aging property of the coiled material through its network structure. Since the modified asphalt forms a strong three-dimensional structure during crosslinking, it can effectively enhance the stability of the coiled material in high-temperature and low-temperature environments, prevent water penetration, ensure the long-term waterproof effect of the coiled material, and at the same time further enhance the adhesion between the reinforcing layer and other layers, preventing the reinforcing layer from being exposed or falling off;

[0045] A protective layer is applied on the surface of the second modified asphalt layer. The protective layer includes mineral aggregates, aluminum foil or polyethylene film to increase the weather resistance of the coiled material. The surface of materials such as mineral aggregates or aluminum foil can effectively reflect ultraviolet rays, avoiding aging and decomposition of the coiled material when exposed to sunlight for a long time; while the polyethylene film can provide a good barrier effect, preventing damage to the coiled material caused by external factors such as moisture and oxygen. In addition, the protective layer can extend the service life of the waterproof coiled material in harsh environments through its weather resistance and wear resistance. The functions of materials such as mineral aggregates and aluminum foil can also enhance the weather resistance of the coiled material, further improving the stability and durability of the material.

[0046] Preferably, the hot pressing and forming includes:

[0047] The layered composite material is fed into a hot pressing device, and the temperature range is set to 150 - 180 °C. At a temperature of 150 - 180 °C, the asphalt and its modified components will reach appropriate fluidity and plasticity, enabling mutual penetration and chemical crosslinking between layers to form a tighter bond. This temperature range can also prevent excessive flow or deformation of the asphalt, avoiding quality problems of the finished product caused by overheating;

[0048] Apply a pressure of 3 - 6 MPa during the hot pressing process, and control the duration within 10 - 20 minutes to tightly bond the layers of materials. The applied pressure of 3 - 6 MPa helps to fully contact and bond the interfaces between the layers of materials through physical compaction. High pressure can reduce the voids inside the materials, enhance the bonding force between layers, and thus improve the overall mechanical properties and structural stability of the coiled material. For each layer in the composite structure, especially the bonding between the reinforcing layer and the modified asphalt layer, the pressure can effectively enhance the bonding force between different layers and avoid delamination or peeling phenomena;

[0049] Use a cooling device to cool the hot - pressed coiled material, and control the cooling temperature within 30 - 50 °C to ensure that the material is shaped and maintains dimensional stability. When the temperature gradually drops from a high temperature to 30 - 50 °C, the molecular chains of asphalt and its modified components gradually stabilize and solidify, forming the final stable structure. Slow cooling can avoid the problem of stress concentration caused by thermal expansion and contraction, thereby improving the dimensional stability and appearance quality of the coiled material. At the same time, the cooling process can also help reduce the internal stress in the material and avoid problems such as cracking or warping during subsequent use;

[0050] Wind up the prepared waterproof coiled material through a winding device and perform cutting and packaging to form the final product. Through the action of the winding device, the cooled and shaped waterproof coiled material is wound into a roll. This process not only facilitates the transportation and storage of the product but also ensures the integrity and stability of the product. The purpose of cutting and packaging is to ensure that each coiled material meets the customer's usage requirements, such as specifications, size, etc. The gentle operation of winding avoids damage to the surface or edges of the coiled material, and packaging can provide additional protection to prevent moisture, pollution, or damage during transportation.

[0051] The present invention provides a super - low - temperature modified asphalt waterproof coiled material. It has the following beneficial effects:

[0052] 1. The present invention adopts a high - proportion Venezuelan asphalt and nano - enhanced modification technology, achieving a significant improvement in low - temperature crack resistance. Compared with the existing technology that simply uses ordinary modified asphalt, it overcomes the problems of material embrittlement and premature crack generation in low - temperature environments, enabling the material to maintain good flexibility under extremely cold conditions.

[0053] 2. The present invention successfully enhances the anti - ultraviolet and weather - resistant properties of the material by introducing fluorinated graphene and nano - rubber particles. Traditional technical solutions often rely only on elastomer modification and are difficult to effectively resist long - term ultraviolet aging. It effectively reduces the surface cracks caused by ultraviolet rays, significantly extends the service life of the material, and is suitable for applications that are long - term exposed to outdoor environments.

[0054] 3. By adopting a multi-layer composite structure design and combining with nano-SiO2 to stabilize the matrix, the structural stability of the present invention is greatly improved. Compared with the traditional single-layer asphalt matrix, the deformation under the alternating temperature and humidity environment is effectively reduced, and the problems of high-temperature softening, warping and cracking of the material caused by humidity influence are solved, so that the material remains stable in a complex environment.

[0055] 4. By optimizing the synergistic effect of the modifier ratio and the nano-material, the balanced optimization of the comprehensive performance is achieved. In the prior art, improving one performance often sacrifices another. For example, enhancing flexibility will lead to a decline in durability. The present invention cleverly adjusts the proportion of each component to achieve all three of low-temperature crack resistance, weather resistance and structural stability, avoiding the negative impact brought by single optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a diagram of the preparation method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0058] Please refer to the attached Figure 1 :

[0059] Example 1: Preparation of a waterproof coiled material with optimized low-temperature crack resistance

[0060] This example mainly aims at the problem of large low-temperature brittleness, adopts a high proportion of Venezuelan asphalt, and at the same time introduces nano-rubber particles and fluorinated graphene to enhance flexibility and low-temperature resistance.

[0061] Material ratio:

[0062] 70# base asphalt and Venezuelan asphalt: 60 parts (where the proportion of Venezuelan asphalt is 40%);

[0063] SBS: 12 parts;

[0064] SEBS: 8 parts;

[0065] SIS: 7 parts;

[0066] Nano-SiO2: 3 parts;

[0067] Nano-rubber particles: 5 parts;

[0068] Fluorinated graphene: 1.2 parts;

[0069] Epoxidized soybean oil: 4 parts;

[0070] Polyetheramine: 2.5 parts;

[0071] Interface optimization aid (3 parts of maleic anhydride grafted SBS and 0.5 part of polyether modified silicone).

[0072] Preparation steps:

[0073] Matrix asphalt modification:

[0074] Mix No. 70 matrix asphalt with Venezuelan asphalt and heat to 180 °C and stir evenly.

[0075] Add SBS, SEBS, and SIS elastomer blend modifiers, shear and emulsify for 60 minutes to ensure thorough mixing.

[0076] Nano-filler reinforcement:

[0077] Disperse nano-SiO2, nano-rubber particles, and fluorinated graphene in a solvent, ultrasonically treat for 30 minutes, and slowly add to the asphalt matrix after uniform dispersion, and continuously stir for 45 minutes.

[0078] Crosslinking reaction:

[0079] Add epoxidized soybean oil and polyetheramine, carry out reaction treatment at 160 °C, and stir for 30 minutes to ensure sufficient crosslinking.

[0080] Interface optimization:

[0081] Add maleic anhydride grafted SBS and polyether modified silicone, continue to stir for 20 minutes to ensure uniform distribution of the reinforcing components and optimize the interlayer bonding force.

[0082] Hot pressing and forming:

[0083] Adopt a multi-layer composite process to coat the first layer of crosslinked modified asphalt (thickness 1 mm).

[0084] Overlay a polyester tire base fabric reinforcement layer, apply a pressure of 5 MPa and maintain for 15 minutes.

[0085] Then coat the second layer of modified asphalt (thickness 1.2 mm), and cool to 40 °C after heat pressing at 180 °C.

[0086] Final forming:

[0087] The protective layer uses mineral aggregates to ensure anti-aging.

[0088] Wind up, cut, and package to obtain the final product.

[0089] Technical effects:

[0090] This process enhances the flexibility of the asphalt matrix, allowing the roll to maintain good ductility at -35°C. Compared with the traditional No. 70 base asphalt roll, the low-temperature crack resistance is improved by about 60%, and the surface does not crack, meeting the use requirements in severe cold areas.

[0091] Example 2: Preparation of waterproof membrane with enhanced weather resistance

[0092] In view of the problem that the coiled material has insufficient UV resistance and weather resistance, this embodiment optimizes the antioxidant components and introduces nano-montmorillonite to improve the anti-aging ability.

[0093] Material ratio:

[0094] No. 70 base asphalt and Venezuelan asphalt: 55 parts (of which Venezuelan asphalt accounts for 50%);

[0095] SBS: 10 parts;

[0096] SEBS: 12 parts;

[0097] SIS: 6 servings;

[0098] Nano-montmorillonite: 5 parts;

[0099] Nano-SiO2: 2 parts;

[0100] Epoxidized soybean oil: 3.5 parts;

[0101] Polyetheramine: 3.2 parts;

[0102] Interface optimization additive (2.5 parts of maleic anhydride grafted SBS and 0.3 parts of polyether modified siloxane).

[0103] Preparation steps:

[0104] Base asphalt modification:

[0105] The No. 70 base asphalt was mixed with the Venezuelan asphalt, heated to 185°C, and mechanically stirred for 1 hour.

[0106] Add SBS, SEBS and SIS and blend for 30 minutes.

[0107] Nano-filled reinforcement:

[0108] Nano-montmorillonite and nano-SiO2 were dispersed in a solvent, stirred and dispersed for 60 minutes, allowed to stand and then subjected to ultrasonic treatment for 30 minutes, and the asphalt matrix was added and stirred for another hour.

[0109] Cross-linking optimization:

[0110] Add epoxidized soybean oil and polyetheramine, and maintain stirring at 170°C for 30 minutes.

[0111] Interface optimization:

[0112] Maleic anhydride grafted SBS and polyether modified silicone are added to improve the interfacial adhesion.

[0113] Hot pressing forming:

[0114] Two layers of cross-linked asphalt are compounded and reinforced with polyester base fabric. Hot pressing parameters: 170 °C, 4.5 MPa, time 12 minutes.

[0115] Reinforcement of protective layer:

[0116] A layer of ultraviolet shielding mineral particles is coated on the surface to improve the weather resistance.

[0117] Forming, cooling, cutting:

[0118] After cooling to 30 °C, it is coiled and packaged.

[0119] Technical effect:

[0120] Under high temperature (70 °C) and ultraviolet aging environment, the material remains intact, the oxidation rate is reduced by 40%, and the service life of the coil is extended by 3 - 5 years compared with the traditional scheme.

[0121] Example 3: Preparation of waterproof coil with improved structural stability

[0122] This example focuses on the interlayer bonding force and dimensional stability of the coil, optimizes the modifier content, and adjusts the hot pressing forming parameters.

[0123] Material ratio:

[0124] 70# matrix asphalt and Venezuelan asphalt: 65 parts (Venezuelan asphalt accounts for 30%);

[0125] SBS: 13 parts;

[0126] SEBS: 10 parts;

[0127] SIS: 5 parts;

[0128] Nano-SiO2: 4 parts;

[0129] Nano rubber particles: 3 parts;

[0130] Fluorinated graphene: 1.5 parts;

[0131] Epoxidized soybean oil: 3 parts;

[0132] Polyetheramine: 2 parts;

[0133] Interface optimization additives (3.5 parts of maleic anhydride grafted SBS, 0.4 parts of polyether modified silicone).

[0134] Preparation steps:

[0135] Optimization of asphalt matrix:

[0136] Heat the 70# base asphalt and Venezuelan asphalt to 180°C and mechanically stir for 45 minutes.

[0137] Nano-filling reinforcement:

[0138] Add nano-SiO2, nano-rubber particles, and fluorinated graphene, and ultrasonically treat for 60 minutes to enhance the interfacial bonding force.

[0139] Crosslinking reaction:

[0140] Add epoxy soybean oil and polyetheramine to increase the crosslinking density and control the stirring time for 45 minutes.

[0141] Interlayer optimization:

[0142] Adopt multi-layer composite. The thickness of the first layer of asphalt is 1.2 mm, the reinforcing layer uses double-layer tire base fabric, and the thickness of the second layer of asphalt is 1 mm.

[0143] Hot pressing and forming:

[0144] Hot pressing parameters: 175°C, pressure 6 MPa, time 18 minutes.

[0145] Cooling and protection:

[0146] After cooling to 35°C, coat the surface with an antioxidant mineral layer.

[0147] Rewinding and cutting:

[0148] Seal and package after rewinding.

[0149] Comparative example 1: Comparison of low-temperature performance:

[0150] In the existing technical solution, a single 70# base asphalt is used and no reinforcing materials such as Venezuelan asphalt are added.

[0151] Preparation process:

[0152] Preparation of asphalt matrix:

[0153] Only use 70# base asphalt without adding Venezuelan asphalt. Heat to 185°C and mix and stir for 30 minutes.

[0154] Addition of modifiers:

[0155] Add SBS: 15 parts, SEBS: 8 parts, SIS: 5 parts. The proportion of modifiers is relatively high, but there is no low-temperature performance enhancing material.

[0156] Filling and reinforcing materials:

[0157] There is no nano-filling reinforcement material such as nano-SiO2 and rubber particles.

[0158] Crosslinking reaction:

[0159] Add epoxidized soybean oil: 4 parts, polyetheramine: 3 parts, and stir at 170 °C for 30 minutes.

[0160] Interface optimization:

[0161] Only use maleic anhydride grafted SBS as the interface optimizer, and do not add polyether modified silicone.

[0162] Hot pressing:

[0163] Hot pressing temperature is 175 °C, pressure is 4 MPa, time is 12 minutes, and no multi-layer composite structure is adopted.

[0164] Comparative Example 2: Weather resistance comparison

[0165] In the prior art, there is no special treatment for enhancing ultraviolet resistance, and no external strengthening measures such as a mineral aggregate protective layer are taken.

[0166] Preparation process:

[0167] Asphalt matrix preparation:

[0168] Use No. 70 base asphalt and Venezuelan asphalt (proportion is 60%), but the amount of Venezuelan asphalt used is relatively low. Heat to 180 °C and stir evenly.

[0169] Modifier addition:

[0170] Add SBS: 12 parts, SEBS: 10 parts, SIS: 8 parts, ensuring that the proportion of the elastomer blend modifier is higher than that of other examples.

[0171] Filling and reinforcing materials:

[0172] Only add nano-SiO2: 4 parts, and do not add antioxidant and ultraviolet-resistant materials such as nano-montmorillonite and fluorinated graphene.

[0173] Crosslinking reaction:

[0174] Add epoxidized soybean oil and polyetheramine, and stir at 160 °C for 30 minutes.

[0175] Interface optimization:

[0176] Use maleic anhydride grafted SBS (3 parts), and do not use polyether modified silicone.

[0177] Hot pressing:

[0178] Hot pressing parameters: 170 °C, pressure 5 MPa, time 15 minutes. No ultraviolet protection layer is adopted.

[0179] Comparative Example 3: Structural stability comparison

[0180] In the prior art solutions, a multi-layer composite structure is not adopted.

[0181] Preparation process:

[0182] Preparation of asphalt matrix:

[0183] Use No. 70 base asphalt and Venezuelan asphalt (proportion 55%), but do not use a high proportion of Venezuelan asphalt. Heat to 175°C and stir evenly for 30 minutes.

[0184] Addition of modifiers:

[0185] Add SBS: 13 parts, SEBS: 7 parts, SIS: 5 parts. The proportion of the elastomer blend modifier is relatively high, but it lacks low-temperature strengthening components.

[0186] Filling and reinforcing materials:

[0187] Do not add nano-rubber particles, only nano-SiO2: 3 parts and nano-montmorillonite: 4 parts, and complete interlayer reinforcement is not achieved.

[0188] Crosslinking reaction:

[0189] Add epoxy soybean oil: 4 parts, polyetheramine: 2.5 parts, stirring temperature 160°C, time 30 minutes.

[0190] Interface optimization:

[0191] Add maleic anhydride grafted SBS (2.5 parts), without polyether-modified silicone oxygen alkane, and the interfacial adhesion is not as good as that of the present invention.

[0192] Hot pressing and forming:

[0193] Hot pressing parameters: 170°C, pressure 4 MPa, time 14 minutes. The thickness of the coil is relatively thin, and a polyester reinforcing layer is not adopted.

[0194] Comparative experiment:

[0195] Purpose of the experiment: This experiment aims to compare the performance differences between different examples and comparative examples, and test the low-temperature crack resistance, weather resistance, structural stability and comprehensive performance of the materials.

[0196] Experimental steps:

[0197] Sample preparation:

[0198] Samples of Example 1, Example 2, Example 3, and Comparative Example 1, Comparative Example 2, and Comparative Example 3 are all prepared according to the same standard method.

[0199] Material mixing: Weigh and mix the asphalt, modifiers, nano-materials, etc. required for each example and comparative example according to the proportion.

[0200] Sample Molding: Use a mold to shape the mixture into a sample of standard size (such as 100mm×100mm×3mm).

[0201] Hot Press Curing: Place the molded sample in a hot press and cure it at a specified temperature and time to ensure full reaction of the material.

[0202] Performance Testing:

[0203] Low - temperature Crack Resistance Test: Place the sample in a low - temperature (-25°C) environment, apply a bending force using a bending testing machine, and record the temperature at which cracks occur and the crack length.

[0204] Weather Resistance Test: Expose the sample using a UVB ultraviolet lamp to simulate the impact of sunlight radiation on the material, and record the number of cracks and surface damage every 200 hours.

[0205] Structural Stability Test: Expose the sample in an environment of high temperature 60°C and humidity 90%, conduct a 24 - hour temperature - humidity alternating cycle, and observe the deformation and stability of the sample.

[0206] Comprehensive Performance Test: Comprehensively evaluate the performance of the sample based on low - temperature crack resistance, weather resistance, and structural stability, and calculate the comprehensive score.

[0207] Data Recording and Analysis:

[0208] All test data during the experiment are recorded in real - time. According to the performance of each sample, calculate indicators such as crack length, deformation amount, and number of cracks respectively to evaluate its performance.

[0209] Compare and analyze the advantages and disadvantages of each experimental group to obtain the performance differences between the examples and the comparative examples.

[0210] Comprehensive Experimental Data Table

[0211]

[0212]

[0213] Experiment Explanation:

[0214] By comparing the experimental results, we can see the significant advantages of the examples in terms of low - temperature crack resistance, weather resistance, and structural stability. Example 1 shows the optimal crack resistance point and crack length, reflecting the optimization effect of a high proportion of modifier and nanomaterials. The materials in the comparative examples generally show cracks earlier in a low - temperature environment and have larger crack lengths, indicating their deficiencies in crack resistance.

[0215] Judging from the weather resistance test results, the materials of the examples performed excellently, with less surface damage and fewer cracks. The materials of the comparative examples were prone to serious surface damage under ultraviolet irradiation, indicating that materials lacking ultraviolet protection components and anti-aging materials performed poorly under long-term sunlight exposure.

[0216] The structural stability test further verified the stability of the examples under high temperature and humidity conditions. The examples had small deformation amounts and few cracks, showing strong stability under the influence of multiple external environments. In contrast, the deformation amounts of the comparative example samples were larger, indicating that they were more prone to deformation and damage under alternating temperature and humidity conditions.

[0217] The fundamental reason for this performance difference is that the examples adopted a high proportion of modified asphalt materials and nano-enhancing components, which could effectively improve the low-temperature flexibility, ultraviolet resistance, and structural stability of the materials. By introducing modified materials such as fluorinated graphene and nano-rubber particles, the overall performance of the materials was improved, ensuring their durability and stability under extreme conditions.

[0218] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-low temperature modified asphalt waterproofing membrane, characterized in that: The waterproof coiled material comprises the following components in parts by weight: No. 70 base asphalt and Venezuelan asphalt: 50-70 parts; Elastomer blending modifier: 10-25 parts; Nano-filling reinforcement component: 2-10 parts; Epoxidized soybean oil: 2-6 parts; Polyetheramine: 1-4 parts; Interface optimization additive: 1-5 parts.

2. The ultra-low temperature modified asphalt waterproofing membrane according to claim 1, characterized in that: The elastomer blend modifier comprises: SBS: 10-15 parts; SEBS: 5-15 parts; SIS: 5-10 servings.

3. The ultra-low temperature modified asphalt waterproofing membrane according to claim 1, characterized in that: The nano-filled reinforcing component comprises: Nano-SiO2: 1-5 parts; Nano-montmorillonite: 2-6 parts; Nano rubber particles: 2-6 parts; Fluorinated graphene: 0.5-2 parts.

4. The ultra-low temperature modified asphalt waterproofing membrane according to claim 1, characterized in that: The interface optimization additive includes: Maleic anhydride grafted SBS: 1-5 parts; Polyether modified siloxane: 0.2-1 part.

5. A method for preparing an ultra-low temperature modified asphalt waterproofing membrane, characterized in that: Using the ultra-low temperature modified asphalt waterproofing membrane according to any one of claims 1 to 4 comprises the following steps: S1. Material pretreatment, by uniformly mixing No. 70 base asphalt with Venezuelan asphalt and elastomer blending modifier to form an asphalt base material with suitable processing performance; S2, nano-filling reinforcement, by introducing nano-filling reinforcement components into the modified asphalt and dispersing them evenly to form a modified asphalt matrix; S3, dynamic cross-linking optimization, forming a stable polymer network through cross-linking; S4, preparation of layered composite structures, used to combine different performance layers to form a coiled material structure with multiple functions; S5. Hot pressing is used to control temperature and pressure to make the composite materials bond tightly and form the desired roll shape.

6. The method for preparing an ultra-low temperature modified asphalt waterproofing membrane according to claim 5, characterized in that: The material pretreatment includes: Mix No. 70 base asphalt with Venezuelan asphalt, heat to 140-160°C, and stir until uniform; Add SBS, SEBS and SIS elastomers, heat to 180-200°C, perform high shear dispersion at a shear rate of 3000-5000rpm, and continue stirring for 40-60min.

7. The method for preparing an ultra-low temperature modified asphalt waterproofing membrane according to claim 5, characterized in that: The nano-filling enhancement includes: Nano-SiO2, nano-montmorillonite, nano-rubber particles, and fluorinated graphene are gradually added, and ultrasonic-assisted dispersion is adopted, with an ultrasonic frequency of 20-40kHz and a treatment time of 10-20min; Continue stirring for 30-40 minutes to evenly disperse the filler in the asphalt matrix.

8. The method for preparing an ultra-low temperature modified asphalt waterproofing membrane according to claim 5, characterized in that: The dynamic cross-linking optimization includes: Add maleic anhydride grafted SBS and polyether modified siloxane to the modified asphalt matrix and stir for 30-50 minutes; Perform thermal cross-linking treatment at a temperature of 190-210°C for 30-60 minutes; Ultraviolet cross-linking treatment is used with a wavelength of 300-400nm and a time of 20-40min to enhance structural stability.

9. The method for preparing an ultra-low temperature modified asphalt waterproofing membrane according to claim 5, characterized in that: The layered composite structure preparation comprises: The modified asphalt after cross-linking is additionally coated on the surface of the asphalt matrix as a transition layer, with a controlled thickness of 0.5-1.5mm; Laying a reinforcing layer on the transition layer, the reinforcing layer comprising a polyester base fabric or a glass fiber mesh fabric, and applying pressure to make it adhere to the transition layer; Apply a second layer of cross-linked modified asphalt on the reinforcement layer, controlling the thickness to 0.5-1.5mm to ensure uniform coating of the material; A protective layer is applied on the surface of the second modified asphalt layer, wherein the protective layer comprises mineral aggregates, aluminum foil or polyethylene film to increase the weather resistance of the coiled material.

10. The method for preparing an ultra-low temperature modified asphalt waterproofing membrane according to claim 5, characterized in that: The hot pressing forming comprises: The layered composite materials are fed into a hot pressing device with a set temperature range of 150-180°C; During the hot pressing process, a pressure of 3-6MPa is applied and the duration is controlled at 10-20min to make each layer of material tightly bonded; A cooling device is used to cool the coiled material after hot pressing. The cooling temperature is controlled at 30-50°C to ensure that the material is shaped and maintains dimensional stability. The prepared waterproofing roll material is rolled up by a rolling device, and is cut and packaged to form a final product.

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