Modified asphalt composition, method for producing the same, and modified asphalt waterproofing sheet

Abstract

The application discloses a modified asphalt composition and a preparation method thereof, and a modified asphalt waterproof coiled material. The modified asphalt composition comprises the following raw material components in parts by weight: composite asphalt: 40-50 parts; softening oil: 8-10 parts; SBS: 5-7 parts; carbon fiber: 1-1.5 parts; glue powder: 10-15 parts; additive: 1-2 parts; filler: 15-25 parts; wherein the carbon fiber and the SBS are interwoven to form a modified network, the mass ratio of the carbon fiber to the SBS is 1:(4-6), the mass ratio of the carbon fiber to the composite asphalt is 1:(27-40), and the mass ratio of the carbon fiber to the additive is 1:(0.7-2). The modified asphalt composition is prepared through the synergistic effect of the composite asphalt, the carbon fiber and the SBS, the high-temperature stability of the modified asphalt composition is improved while the mechanical properties of the modified asphalt composition are ensured, and the influence of hot paving on a road surface or a bridge surface on the waterproof material can be effectively resisted.

Description

Modified bitumen compositions and their preparation methods, modified bitumen waterproof membranes Technical Field

[0001] This application belongs to the technical field of building waterproofing materials, and particularly relates to a modified bitumen composition and its preparation method, and a modified bitumen waterproof membrane. Background Technology

[0002] In road and bridge construction, waterproofing is a crucial factor in ensuring the quality of roads and bridges. However, in some actual engineering cases, poor waterproofing has led to long-term water seepage and leakage on road surfaces, resulting in problems such as cracks, collapses, and faults in the road surface. This can cause corrosion of the roadbed reinforcement, leading to roadbed damage and subsidence, ultimately adversely affecting the service life of roads and bridges and traffic safety.

[0003] The construction of roads and bridges involves complex environmental conditions and requires high-performance waterproofing materials. Existing waterproofing materials cannot simultaneously meet the requirements of high-temperature resistance and low-temperature resistance. Summary of the Invention

[0004] This application provides a modified bitumen composition and its preparation method, as well as a modified bitumen waterproof membrane. The modified bitumen composition of this application can simultaneously guarantee the high-temperature performance and low-temperature resistance requirements of the modified bitumen waterproof membrane.

[0005] In a first aspect, embodiments of this application provide a modified asphalt composition comprising the following raw material components in parts by weight: composite asphalt: 40 to 50 parts; softening oil: 8 to 10 parts; SBS: 5 to 7 parts; carbon fiber: 1 to 1.5 parts; rubber powder: 10 to 15 parts; additives: 1 to 2 parts; filler: 15 to 25 parts; wherein, carbon fiber and SBS interweave to form a modified network, the mass ratio of carbon fiber to SBS is 1:(4 to 6); the mass ratio of carbon fiber to composite asphalt is 1:(27 to 40); and the mass ratio of carbon fiber to additives is 1:(0.7 to 2).

[0006] In the embodiments of this application, the modified asphalt composition, through the synergistic effect of a specific ratio of composite asphalt, carbon fiber, and SBS, improves its high-temperature stability while ensuring the mechanical properties of the modified asphalt composition. It can effectively resist the impact of hot paving of road or bridge deck on waterproof materials. Furthermore, the synergistic effect of carbon fiber and additives can improve the low-temperature brittleness of the carbon fiber-SBS modified network and the modified asphalt composition, resulting in excellent low-temperature crack resistance, making the waterproof layer less prone to cracking, and exhibiting strong environmental adaptability.

[0007] In some embodiments, the carbon fiber contains ≥95 wt% carbon by mass; and / or, the bulk density of the carbon fiber is 700 mg / cm³. 3 ~850mg / cm 3; and / or, the median length of the carbon fiber is 75μm to 150μm, and the average aspect ratio of the carbon fiber is (12 to 13):1; and / or, the tensile strength of the carbon fiber is 2GPa to 3.5GPa, preferably 3GPa to 3.5GPa; and / or, the carbon fiber is pitch-based carbon fiber.

[0008] In some embodiments, the composite asphalt includes a first base asphalt and a second base asphalt, the mass ratio of the first base asphalt to the second base asphalt being (10-15):1; and / or, the penetration of the composite asphalt is 50-80 0.1 mm / 25℃, and the softening point of the composite asphalt is 52℃-65℃.

[0009] In some embodiments, the first base asphalt is 70# asphalt or 90# asphalt, and the second base asphalt is 10# asphalt.

[0010] In some embodiments, the softening point of the modified asphalt composition is ≥120°C; and / or, the low-temperature flexibility of the modified asphalt composition is ≤-32°C, and the low-temperature flexibility after aging is ≤-28°C; the low-temperature flexibility after artificial climate accelerated aging treatment for 720 hours is ≤-25°C; and / or, the Marshall stability of the modified asphalt composition is ≥6KN.

[0011] In some embodiments, the softening oil is a rubber oil and / or a base oil, preferably, the rubber oil has a CA content ≥30% and the base oil has a Cp content ≥80%; and / or, the SBS has a molecular weight of 170kDa to 210kDa and a styrene content of 30% to 38%; and / or, the additive is a polyalphaolefin base oil, preferably, the polyalphaolefin base oil has a kinematic viscosity of 14.5 mm at 100°C. 2 / S~15mm 2 / S, the pour point of the poly(α-olefin) base oil is -60℃ to -55℃; and / or, the rubber powder is 80 mesh tire rubber powder, preferably, the rubber content in the 80 mesh tire rubber powder is 75% to 80%; and / or, the filler is heavy calcium carbonate, preferably, the fineness of the heavy calcium carbonate is 200 mesh to 400 mesh.

[0012] Secondly, embodiments of this application also provide a method for preparing a modified asphalt composition, comprising the following steps: mixing composite asphalt and softening oil, heating to a first predetermined temperature, and stirring at a first predetermined speed to obtain a first premix; adding SBS and carbon fiber to the first premix, heating to a second predetermined temperature, and stirring at a second predetermined speed for a first predetermined time to obtain a second premix; adding rubber powder and additives to the second premix, and stirring at a third predetermined speed for a second predetermined time to obtain a third premix; adding filler to the third premix, and stirring at a third predetermined temperature and a fourth predetermined speed for a third predetermined time to obtain a modified asphalt composition.

[0013] In some embodiments, the first predetermined temperature is 150℃~160℃, the first predetermined rotation speed is 600r / min~800r / min, the first predetermined time is 1.5h~2h, the second predetermined temperature is 180℃~190℃, the second predetermined rotation speed is 1000r / min~1200r / min, the third predetermined rotation speed is 1200r / min~1400r / min, the second predetermined time is 1h~1.5h, the third predetermined temperature is 170℃~180℃, the fourth predetermined rotation speed is 1200r / min~1400r / min, and the third predetermined time is 50min~60min.

[0014] Thirdly, a modified bitumen waterproof membrane includes an upper protective layer, a first modified bitumen layer, a base layer, a second modified bitumen layer, and a lower protective layer arranged sequentially; wherein the first modified bitumen layer and / or the second modified bitumen layer are prepared from the modified bitumen composition of the first aspect or from the modified bitumen composition prepared by the preparation method of the second aspect.

[0015] In some embodiments, the upper protective layer is a mineral aggregate protective layer. Preferably, the particle size of the river sand in the mineral aggregate protective layer is 0.4 mm to 0.8 mm, and the thickness of the mineral aggregate protective layer is 0.8 mm to 1.0 mm; and / or, the thickness of the first modified asphalt layer and / or the second modified asphalt layer is 1.4 mm to 1.6 mm; and / or, the base layer is made of polyester base material after being pre-impregnated with silica gel modified asphalt. Preferably, the modified silica gel asphalt comprises asphalt with a mass percentage of 95 wt% to 96 wt% and silica gel with a mass percentage of 4 wt% to 5 wt%, and the basis weight of the polyester base material is 345 g / m³. 2 ~355g / m 2 .

[0016] Compared with the prior art, the modified asphalt composition provided in this application, through the synergistic effect of composite asphalt, carbon fiber, and SBS, improves the high-temperature stability while ensuring the mechanical properties of the modified asphalt composition. It can effectively resist the impact of hot paving of road or bridge deck on waterproof materials. Furthermore, the synergistic effect of carbon fiber and additives can improve the low-temperature brittleness of the carbon fiber-SBS modified network and the modified asphalt composition, resulting in excellent low-temperature crack resistance, making the waterproof layer less prone to cracking, and exhibiting strong environmental adaptability.

[0017] The modified bitumen waterproof membrane provided in this application has good high-temperature stability, which can effectively resist the impact of hot paving of road or bridge surfaces on the waterproof material. It also has excellent low-temperature crack resistance, and the waterproof layer is not easy to crack. It has strong environmental adaptability, high strength and high modulus, reliable waterproof effect, aging resistance, corrosion resistance and long service life. Detailed Implementation

[0018] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0019] For simplicity, this application only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form a range not explicitly stated; and any lower limit can be combined with other lower limits to form a range not explicitly stated, just as any upper limit can be combined with any other upper limit to form a range not explicitly stated. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit and combined with any other point or individual value or with other lower or upper limits to form a range not explicitly stated.

[0020] The foregoing description of this application is not intended to describe every disclosed embodiment or implementation. The following description illustrates exemplary embodiments in more detail. Throughout the application, guidance is provided through a series of embodiments that can be used in various combinations. In each example, the enumeration is merely representative and should not be construed as exhaustive. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] Waterproofing is a crucial factor in ensuring the quality of roads and bridges during construction. However, in some actual engineering cases, ineffective waterproofing has led to long-term water seepage and leakage in road surfaces, resulting in problems such as cracks, collapses, and faults. This can cause corrosion of the roadbed reinforcement, leading to roadbed damage and subsidence, ultimately adversely affecting the service life of roads and bridges and traffic safety. Waterproofing materials specifically designed for roads and bridges require high technical standards, especially in adapting to the unique functional requirements and environmental conditions of road and bridge construction.

[0023] The existing waterproof membranes for roads and bridges on the market are generally SBS or APP polymer modified bitumen waterproof membranes. SBS modified bitumen membranes do not have sufficient high temperature resistance, and the waterproof layer is easily damaged when hot asphalt concrete is laid on the bridge deck. Although APP modified bitumen has better high temperature resistance, its low temperature performance, elasticity, and elongation are poor. After long-term use, the waterproof layer on the road and bridge surface is prone to cracking, which poses a risk of leakage.

[0024] In view of the above-mentioned technical problems, this application provides a modified bitumen composition that can simultaneously ensure the high-temperature performance and low-temperature resistance of the modified bitumen waterproof membrane.

[0025] The modified bitumen composition provided in the embodiments of this application will be described below.

[0026] According to this application, the modified asphalt composition comprises the following raw material components in parts by weight: composite asphalt: 40-50 parts; softening oil: 8-10 parts; SBS: 5-7 parts; carbon fiber: 1-1.5 parts; rubber powder: 10-15 parts; additives: 1-2 parts; filler: 15-25 parts; wherein, carbon fiber and SBS interweave to form a modified network, and the mass ratio of carbon fiber to SBS is 1:(4-6), for example, it can be 1:4, 1:4.5, 1:5, or 1: 5.5, 1:6, or any combination of the above values; the mass ratio of carbon fiber to composite pitch is 1:(27 to 40), for example, it can be 1:27, 1:30, 1:32, 1:35, 1:38, 1:40, or any combination of the above values; the mass ratio of carbon fiber to additives is 1:(0.7 to 2), for example, it can be 1:0.7, 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2, or any combination of the above values.

[0027] The inventors discovered that carbon fiber itself forms good adhesion with non-polar substances in asphalt, while simultaneously promoting the absorption and full swelling of lightweight components in asphalt by SBS. High-speed shearing expands the molecular structure, and the carbon fiber and SBS intertwine through intermolecular van der Waals forces to form a more stable three-dimensional network structure. This reduces asphalt segregation phase transitions and makes the entire system more stable. Based on this, when the mass ratio of carbon fiber to SBS in the modified asphalt composition is 1:(4-6) and the mass ratio of carbon fiber to composite asphalt is 1:(27-40), the three components exhibit a synergistic effect. While ensuring the mechanical properties of the modified asphalt composition, it improves high-temperature stability, effectively resisting the impact of hot paving of road or bridge surfaces on waterproofing materials. Furthermore, when the mass ratio of carbon fiber to additives is 1:(0.7-2), the synergistic effect of carbon fiber and additives can improve the low-temperature brittleness of the carbon fiber-SBS modified network and the modified asphalt composition, resulting in excellent low-temperature crack resistance, making the waterproof layer less prone to cracking, and exhibiting strong environmental adaptability.

[0028] In some embodiments, the carbon fiber contains ≥95 wt% carbon by mass, for example, 95 wt%, 95.2 wt%, 95.5 wt%, 96 wt%, 97 wt%, 98 wt%, or any combination thereof; and / or, the bulk density of the carbon fiber is 700 mg / cm³. 3 ~850mg / cm 3 For example, it can be 700 mg / cm³. 3 720mg / cm 3 750mg / cm 3 780mg / cm 3 800mg / cm 3 820mg / cm 3 850mg / cm 3 The carbon fiber has a median length of 75 μm to 150 μm, for example, it can be 75 μm, 80 μm, 90 μm, 100 μm, 110 μm, 130 μm, 150 μm, or any combination of the above values; the carbon fiber has an average aspect ratio of (12 to 13):1, for example, it can be 12:1, 12.2:1, 12.4:1, 12.6:1, 12.8:1, 13:1, or any combination of the above values; and / or the carbon fiber has a tensile strength of 2 GPa to 3.5 GPa, for example, it can be 2 GPa, 2.2 GPa, 2.5 GPa, 3 GPa, 3.5 GPa, or any combination of the above values, preferably 3 GPa to 3.5 GPa; and / or the carbon fiber is pitch-based carbon fiber.

[0029] In some embodiments, the composite asphalt includes a first base asphalt and a second base asphalt, wherein the mass ratio of the first base asphalt to the second base asphalt is (10-15):1, for example, it can be 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, or any combination of the above values; and / or, the penetration of the composite asphalt is 50-80 0.1 mm / 25℃, for example, it can be 50 0.1 mm / 25℃, 55 0.1 mm / 25℃, 60 0.1 mm / 25℃, 65 0.1 mm / 25℃, 70 0.1 mm / 25℃, 75 0.1 mm / 25℃, 80 0.1 mm / 25℃, or any combination of the above values; and the softening point of the composite asphalt is 52℃-65℃, for example, it can be 52℃, 55℃, 58℃, 60℃, 62℃, 65℃, or any combination of the above values.

[0030] In some embodiments, the first base asphalt is 70# asphalt or 90# asphalt, and the second base asphalt is 10# asphalt.

[0031] In some embodiments, the softening point of the modified asphalt composition is ≥120°C, for example, it can be any combination of 120°C, 122°C, 125°C, 128°C, 130°C, 135°C, 140°C, or higher; and / or, the low-temperature flexibility of the modified asphalt composition is ≤-32°C, for example, it can be any combination of -40°C, -38°C, -36°C, -34°C, -32°C, or higher; and the low-temperature flexibility after aging is ≤-28°C, for example, it can be -32°C, -31°C, -30°C, or higher. -29℃, -28℃, or any combination of values ​​above, and after 720 hours of accelerated aging treatment in artificial climate, the low-temperature flexibility is ≤-25℃, for example, it can be -32℃, -31℃, -30℃, -29℃, -28℃, -27℃, -26℃, -25℃, or any combination of values ​​above; and / or, the Marshall stability of the modified asphalt composition is ≥6KN, for example, it can be 6KN, 6.2KN, 6.4KN, 6.6KN, 6.8KN, 7KN, or any combination of values ​​above.

[0032] In some embodiments, the softening oil is a rubber oil and / or a base oil. Preferably, the rubber oil has a CA content ≥30%, for example, any combination of 30%, 32%, 35%, 38%, 40%, or higher; and the base oil has a Cp content ≥80%, for example, any combination of 80%, 82%, 85%, 88%, 90%, or higher. And / or, the SBS has a molecular weight of 170kDa to 210kDa, for example, any combination of 170kDa, 180kDa, 190kDa, 200kDa, 210kDa, or higher; and the SBS has a styrene content of 30% to 38%, for example, any combination of 30%, 32%, 34%, 36%, 38%, or higher. And / or, the additive is a poly(α-olefin) base oil. Preferably, the poly(α-olefin) base oil has a kinematic viscosity of 14.5 mmHg at 100°C. 2 / S~15mm 2 / S, for example, can be 14.5mm 2 / S, 14.6mm 2 / S, 14.7mm 2 / S, 14.8mm 2 / S, 14.9mm 2 / S, 15mm 2 / S, or any combination of the above values, the pour point of the poly(α-olefin) base oil is -60℃ to -55℃, for example, it can be -60℃, -59℃, -58℃, -57℃, -56℃, -55℃, or any combination of the above values; and / or, the rubber powder is 80 mesh tire rubber powder, preferably, the rubber content in the 80 mesh tire rubber powder is 75% to 80%, for example, it can be 75%, 76%, 77%, 78%, 79%, 80%, or any combination of the above values; and / or, the filler is heavy calcium carbonate, preferably, the fineness of the heavy calcium carbonate is 200 mesh to 400 mesh, for example, it can be 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, or any combination of the above values.

[0033] In a second aspect, a method for preparing a modified asphalt composition includes the following steps: mixing composite asphalt and softening oil, heating to a first predetermined temperature, and stirring at a first predetermined speed to obtain a first premix; adding SBS and carbon fiber to the first premix, heating to a second predetermined temperature, and stirring at a second predetermined speed for a first predetermined time to obtain a second premix; adding rubber powder and additives to the second premix, and stirring at a third predetermined speed for a second predetermined time to obtain a third premix; adding filler to the third premix, and stirring at a third predetermined temperature and a fourth predetermined speed for a third predetermined time to obtain a modified asphalt composition.

[0034] In some embodiments, the first predetermined temperature is 140°C to 160°C, for example, it can be any combination of 140°C, 145°C, 150°C, 155°C, 160°C, or higher; the first predetermined rotational speed is 600 r / min to 800 r / min, for example, it can be any combination of 600 r / min, 650 r / min, 700 r / min, 750 r / min, 800 r / min, or higher; the first predetermined time is 1.5 h to 2 h, for example, it can be 1.5 h or 1.6 h. The second predetermined temperature is 180℃~190℃, for example, it can be any combination of 180℃, 182℃, 185℃, 188℃, 190℃, or higher. The second predetermined rotational speed is 1000r / min~1200r / min, for example, it can be any combination of 1000r / min, 1050r / min, 1100r / min, 1150r / min, 1200r / min, or higher. The predetermined rotational speed is 1200 r / min to 1400 r / min, for example, it can be any combination of 1200 r / min, 1250 r / min, 1300 r / min, 1350 r / min, 1400 r / min, or the above values; the predetermined time is 1 h to 1.5 h, for example, it can be 1 h, 1.1 h, 1.2 h, 1.3 h, 1.4 h, or 1.5 h; the predetermined temperature is 170℃ to 180℃, for example, it can be 170℃, 172℃, 175℃, or 178℃. The fourth predetermined speed is 1200 r / min to 1400 r / min, for example, it can be any combination of 1200 r / min, 1250 r / min, 1300 r / min, 1350 r / min, 1400 r / min or higher; the third predetermined time is 50 min to 60 min, for example, it can be any combination of 50 min, 52 min, 54 min, 56 min, 58 min, 60 min or higher.

[0035] Thirdly, a modified bitumen waterproof membrane includes an upper protective layer, a first modified bitumen layer, a base layer, a second modified bitumen layer, and a lower protective layer arranged sequentially; wherein the first modified bitumen layer and / or the second modified bitumen layer are prepared from the modified bitumen composition of the first aspect or from the modified bitumen composition prepared by the preparation method of the second aspect.

[0036] In some embodiments, the upper protective layer is a mineral granule protective layer. Preferably, the particle size of the river sand in the mineral granule protective layer is 0.4 mm to 0.8 mm, for example, it can be any combination of 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or higher. The thickness of the mineral granule protective layer is 0.8 mm to 1.0 mm, for example, it can be any combination of 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, or higher. And / or, the first... The thickness of the modified asphalt layer and / or the second modified asphalt layer is 1.4 mm to 1.6 mm, for example, it can be any combination of 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, or the above values; and / or, the base layer is made of polyester base material pre-impregnated with silica-modified asphalt. Preferably, the modified silica-modified asphalt comprises asphalt with a mass percentage of 95 wt% to 96 wt% and silica gel with a mass percentage of 4 wt% to 5 wt%, and the basis weight of the polyester base material is 345 g / m². 2 ~355g / m 2 For example, it can be 345g / m 2 348g / m 2 350g / m 2 352g / m 2 345g / m 2 , or any combination of the above values. Silica-modified bitumen pre-impregnation can enhance the puncture resistance of the base layer and the corrosion resistance of the roll material.

[0037] In some of the above embodiments, the modified bitumen waterproof membrane of this application has good high-temperature stability, which can effectively resist the impact of hot paving of road or bridge deck on the waterproof material, and has excellent low-temperature crack resistance, the waterproof layer is not easy to crack, strong environmental adaptability, high strength and high modulus, reliable waterproof effect, aging resistance, corrosion resistance, and long service life.

[0038] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0040] The following embodiments describe the contents disclosed in this application in more detail. These embodiments are for illustrative purposes only.

[0041] Because various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages and ratios reported in the following examples are based on mass, and all raw materials used in the examples are commercially available or prepared by conventional methods and can be used directly without further processing, and the instruments used in the examples are commercially available.

[0042] Example 1

[0043] A modified asphalt composition comprising: 46 kg (parts) of composite asphalt, 9 kg (parts) of softening oil, 6 kg (parts) of SBS, 1.5 kg (parts) of carbon fiber, 12 kg (parts) of 80-mesh tire rubber powder, 2 kg (parts) of poly(α-olefin) base oil, and 23.5 kg (parts) of heavy calcium carbonate.

[0044] The carbon fiber contains ≥95 wt% carbon by mass, and its bulk density is 760 mg / cm³. 3 The median length of the carbon fiber is 100 μm, the average aspect ratio of the carbon fiber is 12:1, the tensile strength of the carbon fiber is 3.5 GPa, and the carbon fiber is pitch-based carbon fiber.

[0045] The first matrix asphalt in the composite asphalt is 70# asphalt, and the second matrix asphalt is 10# asphalt. The mass ratio of the first matrix asphalt to the second matrix asphalt is 13:1. The penetration of the composite asphalt is 600.1 mm / 25℃, and the softening point of the composite asphalt is 62℃.

[0046] The softening oil is the base oil, and the Cp content in the base oil is ≥80%.

[0047] SBS has a molecular weight of about 200 kDa and a styrene content of 35%.

[0048] The kinematic viscosity of the poly(α-olefin) base oil at 100°C is 14.94 mm. 2 / S, the pour point of poly(α-olefin) base oil is -52℃.

[0049] The rubber content in 80-mesh tire rubber powder is 75% to 80%.

[0050] The fineness of heavy calcium carbonate is 200 mesh to 400 mesh.

[0051] The modified asphalt composition was prepared by the following method: A first premix was obtained by mixing composite asphalt and softening oil, heating to 160°C, and stirring at 750 r / min; SBS and carbon fiber were added to the first premix, and the mixture was heated to 185°C and stirred at 1200 r / min for 2 h to obtain a second premix; rubber powder and additives were added to the second premix, and the mixture was stirred at a third predetermined speed for 1.5 h to obtain a third premix; filler was added to the third premix, and the mixture was stirred at 189°C and 1400 r / min for 60 min to obtain the modified asphalt composition.

[0052] Examples 2-4

[0053] The preparation methods of the modified asphalt compositions in Examples 2-4 are the same as those in Example 1, except that the raw material ratios of the modified asphalt compositions are detailed in Table 1.

[0054] Table 1. Raw material proportions of the modified asphalt compositions in Examples 1-4 and Comparative Examples 1-5

[0055]

[0056] Examples 5-8

[0057] The preparation methods and raw material ratios of the modified bitumen compositions in Examples 5-8 are the same as those in Example 1, except for the parameters of the carbon fiber, as detailed in Table 2.

[0058] Table 2. Parameters of carbon fibers in Examples 1, 5-8, and Comparative Examples 6-9.

[0059]

[0060] Comparative Examples 1-5

[0061] The preparation methods of the asphalt compositions in Comparative Examples 1-5 are the same as those in Example 1, except that the raw material composition and proportions of the modified asphalt compositions are detailed in Table 1.

[0062] Comparative Examples 6-9

[0063] The preparation methods and raw material ratios of the asphalt compositions in Comparative Examples 6-9 are the same as those in Example 1, except for the parameters of the carbon fiber, as detailed in Table 2.

[0064] The modified asphalt compositions of Examples 1-8 and the asphalt compositions of Comparative Examples 1-9 were subjected to performance tests. The softening point was tested according to the ring and ball method. The low-temperature flexibility was tested according to the requirements of 5.3.5 in the standard TBT / T 2965-2018 "Waterproofing Layer for Concrete Bridge Deck of Railway Bridge". The asphalt compositions were subjected to heat aging treatment and artificial climate accelerated aging treatment according to the requirements of GB 18242-2008 "Elastomer Modified Asphalt Waterproofing Membrane" and then the low-temperature flexibility was tested. The Marshall stability was tested according to T0709-2011. The test results are shown in Table 3.

[0065] Table 3. Properties of the asphalt compositions of Examples 1-8 and Comparative Examples 1-9

[0066]

[0067] The results above show that the modified asphalt composition provided in this application, through the special raw material ratio and the control of carbon fiber parameters, has a synergistic effect, which makes the modified asphalt composition of this application have excellent high temperature resistance and low temperature flexibility. Moreover, after thermal aging and artificial climate accelerated aging, the material's low temperature flexibility decreases very little, while also having good wear resistance and good environmental adaptability.

[0068] Examples 9-16

[0069] The modified bitumen waterproof membrane comprises, in sequence, an upper protective layer, a first modified bitumen layer, a base layer, a second modified bitumen layer, and a lower protective layer. The first and second modified bitumen layers are prepared using the modified bitumen compositions of Examples 1-8 (that is, the modified bitumen composition of Example 1 is used to prepare the first and second modified bitumen layers of Example 9, the modified bitumen composition of Example 2 is used to prepare the first and second modified bitumen layers of Example 10, and so on). The thickness of the first and second modified bitumen layers is 1.5 mm.

[0070] The upper protective layer is a mineral granule protective layer, which is river sand with a particle size of 0.6 mm and a thickness of 0.9 mm. The lower protective layer is a polyester release film.

[0071] The base layer is made of polyester base material pre-impregnated with silica-modified asphalt. The modified silica-modified asphalt consists of 95 wt% 70# asphalt and 5 wt% silica gel. The silica gel (purchased from Qingdao Chenrong New Materials Co., Ltd.) is silica gel powder with a SiO2 content of approximately 98%, an average particle size of 1000 mesh, and a density of 0.28–0.3 kg / m³. 3 The basis weight of the polyester base is 350 g / m². 2 .

[0072] Example 17

[0073] Except for the base layer, the modified bitumen waterproof membrane is the same as in Example 9.

[0074] The base course is made of polyester base course after preimpregnation with a base course preimpregnating agent, which consists of 80 wt% 70# bitumen and 20 wt% 10# bitumen; the basis weight of the polyester base course is 350 g / m². 2 .

[0075] Comparative Example 10

[0076] Comparative Example 10 provides a common polymer-modified bitumen waterproof membrane, the bitumen layer of which consists of 45 wt% bitumen, 11 wt% base oil, 6 wt% SBS, 2.5 wt% APP, 12.5 wt% adhesive powder and 23 wt% filler; its base prepreg consists of 80 wt% 70# bitumen and 20 wt% 10# bitumen; its material structure is consistent with the membranes provided in Examples 9-17.

[0077] Performance tests were conducted on the modified bitumen waterproof membranes of Examples 9-17 and the bitumen waterproof membrane of Comparative Example 10. The products were tested according to the standard TBT / T 2965-2018, and the test results are shown in Table 4.

[0078] Table 4 shows the performance of the modified bitumen waterproof membranes in Examples 9-17 and the bitumen waterproof membrane in Comparative Example 10.

[0079]

[0080] Compared with existing asphalt waterproof membranes, the above results show that the modified asphalt waterproof membrane provided in this application has excellent high temperature resistance, low temperature flexibility, physical and mechanical properties that adapt to the deformation of the base layer, and corrosion resistance in the long-term underground environment. It can meet the complex environmental conditions during the construction of roads and bridges and achieve reliable waterproofing effect.

[0081] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A modified bitumen composition, characterized in that, The raw material components include the following parts by weight: composite asphalt: 40-50 parts, softening oil: 8-10 parts, SBS: 5-7 parts, carbon fiber: 1-1.5 parts, rubber powder: 10-15 parts, additives: 1-2 parts, and filler: 15-25 parts; wherein, the carbon fiber and SBS are interwoven to form a modified network, and the mass ratio of carbon fiber to SBS is 1:(4-6); the mass ratio of carbon fiber to composite asphalt is 1:(27-40); the mass ratio of carbon fiber to additives is 1:(0.7-2); the composite asphalt includes a first matrix asphalt and a second matrix asphalt, and the mass ratio of the first matrix asphalt to the second matrix asphalt is (10-15):1, the first matrix asphalt is 70# asphalt or 90# asphalt, and the second matrix asphalt is 10# asphalt; the carbon fiber has a carbon content ≥95wt% and a bulk density of 700mg / cm³. 3 ~850mg / cm 3 The median length of the carbon fiber is 75μm~150μm, the average aspect ratio of the carbon fiber is (12~13):1, the tensile strength of the carbon fiber is 2GPa~3.5Gpa, the carbon fiber is pitch-based carbon fiber, and the additive is poly(α-olefin) base oil.

2. The modified bitumen composition according to claim 1, characterized in that, The tensile strength of the carbon fiber is 3 GPa to 3.5 GPa.

3. The modified bitumen composition according to claim 1, characterized in that, The composite asphalt has a penetration of 50~80 0.1mm / 25℃ and a softening point of 52℃~65℃.

4. The modified bitumen composition according to claim 1, characterized in that, The softening point of the modified asphalt composition is ≥120℃; and / or, the low-temperature flexibility of the modified asphalt composition is ≤-32℃, the low-temperature flexibility after aging is ≤-28℃, and the low-temperature flexibility after artificial climate accelerated aging treatment for 720h is ≤-25℃; and / or, the Marshall stability of the modified asphalt composition is ≥6KN.

5. The modified bitumen composition according to any one of claims 1 to 4, characterized in that, The softening oil is rubber oil and / or base oil; and / or, the molecular weight of the SBS is 170kDa~210kDa, and the styrene content in the SBS is 30%~38%; and / or, the rubber powder is 80-mesh tire rubber powder; and / or, the filler is heavy calcium carbonate.

6. The modified bitumen composition according to claim 5, characterized in that, The rubber oil has a CA content of ≥30%, and the base oil has a Cp content of ≥80%.

7. The modified bitumen composition according to claim 5, characterized in that, The rubber content in the 80-mesh tire rubber powder is 75%~80%.

8. The modified bitumen composition according to claim 5, characterized in that, The fineness of the heavy calcium carbonate is 200 mesh to 400 mesh.

9. A method for preparing a modified asphalt composition according to any one of claims 1 to 8, characterized in that, The process includes the following steps: mixing the composite asphalt and softening oil, heating to a first predetermined temperature, and stirring at a first predetermined speed to obtain a first premix; adding SBS and carbon fiber to the first premix, heating to a second predetermined temperature, and stirring at a second predetermined speed for a first predetermined time to obtain a second premix; adding the rubber powder and additives to the second premix, and stirring at a third predetermined speed for a second predetermined time to obtain a third premix; adding filler to the third premix, and stirring at a third predetermined temperature and a fourth predetermined speed for a third predetermined time to obtain the modified asphalt composition.

10. The preparation method according to claim 9, characterized in that, The first predetermined temperature is 150℃~160℃, the first predetermined rotation speed is 600r / min~800r / min; the first predetermined time is 1.5h~2h, the second predetermined temperature is 180℃~190℃, the second predetermined rotation speed is 1000r / min~1200r / min; the third predetermined rotation speed is 1200r / min~1400r / min, the second predetermined time is 1h~1.5h; the third predetermined temperature is 170℃~180℃, the fourth predetermined rotation speed is 1200r / min~1400r / min, and the third predetermined time is 50min~60min.

11. A modified bitumen waterproof membrane, characterized in that, It includes an upper protective layer, a first modified asphalt layer, a base course, a second modified asphalt layer, and a lower protective layer arranged sequentially; wherein the first modified asphalt layer and the second modified asphalt layer are prepared by the modified asphalt composition as described in any one of claims 1 to 8 or by the modified asphalt composition prepared by the preparation method as described in any one of claims 9 to 10.

12. The modified bitumen waterproof membrane according to claim 11, characterized in that, The upper protective layer is a mineral granule protective layer; and / or, the thickness of the first modified asphalt layer and / or the second modified asphalt layer is 1.4mm~1.6mm; and / or, the base layer is made of polyester base after being pre-impregnated with silicone-modified asphalt.

13. The modified bitumen waterproof membrane according to claim 12, characterized in that, The particle size of the river sand in the mineral granule protective layer is 0.4mm~0.8mm, and the thickness of the mineral granule protective layer is 0.8mm~1.0mm.

14. The modified bitumen waterproof membrane according to claim 12, characterized in that, The silica-modified asphalt comprises asphalt with a mass percentage of 95wt%~96wt% and silica gel with a mass percentage of 4wt%~5wt%, and the polyester base has a basis weight of 345g / m³. 2 ~355g / m 2 .

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