Modified asphalt composition, preparation method thereof and modified asphalt waterproof coiled material

Abstract

The invention discloses a modified asphalt composition, 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: 40-50 parts of composite asphalt; 8 to 10 parts of softening oil; 5 to 7 parts of SBS (Styrene Butadiene Styrene); 1 to 1.5 parts of carbon fiber; 10 to 15 parts of rubber powder; 1-2 parts of an auxiliary agent; 15 to 25 parts of a filling material; wherein the carbon fibers and the SBS are interwoven to form a modified network, and the mass ratio of the carbon fibers to the SBS is 1: (4-6); the mass ratio of the carbon fibers to the composite asphalt is 1: (27-40); the mass ratio of the carbon fiber to the auxiliary agent is 1: (0.7-2). According to the modified asphalt composition, through the synergistic effect of the composite asphalt, the carbon fibers and the SBS, the mechanical property of the modified asphalt composition is guaranteed, meanwhile, the high-temperature stability of the modified asphalt composition is improved, and the influence on a waterproof material during thermal pavement of a pavement or a bridge deck can be effectively resisted.

Description

Technical Field

[0001] The present application belongs to the technical field of building waterproof materials, and in particular relates to a modified asphalt composition and a preparation method thereof, and a modified asphalt waterproofing membrane. Background Art

[0002] In the construction of roads and bridges, waterproofing is an important factor in ensuring the quality of roads and bridges. However, in some actual engineering cases, there are phenomena of long-term water seepage and leakage on the road and bridge pavement due to poor waterproofing effect, which in turn causes problems such as cracks, collapses, and faults on the road surface, causing corrosion of the roadbed steel bars, resulting in roadbed damage and collapse, which ultimately have an adverse impact on the service life of roads and bridges and driving safety.

[0003] During the construction of roads and bridges, the environmental conditions are complex and the functional requirements of waterproof materials are high. The existing waterproof materials cannot take into account the requirements of high temperature resistance and low temperature resistance. Summary of the invention

[0004] The embodiments of the present application provide a modified asphalt composition and a preparation method thereof, and a modified asphalt waterproofing membrane. The modified asphalt composition of the present application can simultaneously meet the requirements of high temperature performance and low temperature resistance of the modified asphalt waterproofing membrane.

[0005] In the first aspect, an embodiment of the present application provides 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 the carbon fiber and SBS are interwoven to form a modified network, and 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 the present application, the modified asphalt composition improves its high-temperature stability while ensuring the mechanical properties of the modified asphalt composition through the synergistic effect of composite asphalt, carbon fiber, and SBS in specific proportions, and can effectively resist the impact of hot paving of the road or bridge deck on the waterproof material. In addition, 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, and the low-temperature crack resistance is excellent, the waterproof layer is not easy to crack, and the environmental adaptability is strong.

[0007] In some embodiments, the mass percentage of carbon in the carbon fiber is ≥ 95wt%; and / or the bulk density of the carbon fiber is 700g / cm 3 ~850g / 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 asphalt-based carbon fiber.

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

[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 720h of artificial climate accelerated aging treatment is ≤-25°C; and / or, the Marshall stability of the modified asphalt composition is ≥6KN.

[0011] In some embodiments, the softening oil is rubber oil and / or base oil, preferably, the CA content in the rubber oil is ≥30%, and the Cp content in the base oil is ≥80%; and / or, the molecular weight of SBS is 170kDa to 210kDa, and the styrene content in SBS is 30% to 38%; and / or, the additive is a poly-α-olefin base oil, preferably, the kinematic viscosity of the poly-α-olefin base oil at 100°C is 14.5mm 2 / S~15mm 2 / S, the solidification point of the poly-α-olefin base oil is -60°C to -55°C; 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] In the second aspect, the embodiment of the present application also provides a method for preparing a modified asphalt composition, comprising the following steps: mixing the composite asphalt and softening oil, heating the temperature 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 the temperature 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 speed is 600r / min~800r / min; the first predetermined time is 1.5h~2h, the second predetermined temperature is 180℃~190℃, the second predetermined speed is 1000r / min~1200r / min; the third predetermined speed is 1200r / min~1400r / min, and the second predetermined time is 1h~1.5h; the third predetermined temperature is 170℃~180℃, the fourth predetermined speed is 1200r / min~1400r / min, and the third predetermined time is 50min~60min.

[0014] In a third aspect, a modified asphalt waterproofing membrane comprises an upper protective layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a lower protective layer arranged in sequence; wherein the first modified asphalt layer and / or the second modified asphalt layer is made from the modified asphalt composition of the first aspect or the modified asphalt composition prepared by the preparation method of the second aspect.

[0015] In some embodiments, the upper protective layer is a mineral granular protective layer. Preferably, the particle size of the river sand in the mineral granular protective layer is 0.4 mm to 0.8 mm, and the thickness of the mineral granular 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 tread base layer is a polyester tread base obtained by pre-impregnation with silicone modified asphalt. Preferably, the modified silicone asphalt includes 95 wt% to 96 wt% of asphalt and 4 wt% to 5 wt% of silicone by mass, and the gram weight of the polyester tread base is 345 g / m 2 ~355g / m 2 .

[0016] Compared with the prior art, the modified asphalt composition provided in the embodiment of the present application improves the high-temperature stability while ensuring the mechanical properties of the modified asphalt composition through the synergistic effect of composite asphalt, carbon fiber, and SBS, and can effectively resist the impact of hot paving of the road or bridge deck on the waterproof material. In addition, 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, and has excellent low-temperature crack resistance, the waterproof layer is not easy to crack, and the environmental adaptability is strong.

[0017] The modified asphalt waterproof roll provided in the embodiment of the present application has good high-temperature stability, can effectively resist the impact of hot paving of the road or bridge deck on the waterproof material, and has excellent low-temperature crack resistance, the waterproof layer is not easy to crack, and has strong environmental adaptability. It also has high strength and high modulus, reliable waterproof effect, aging resistance, corrosion resistance, and a long material service life. DETAILED DESCRIPTION

[0018] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0019] For simplicity, this application only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unclearly recorded range; and any lower limit can be combined with other lower limits to form an unclearly recorded range, and any upper limit can be combined with any other upper limit to form an unclearly recorded range. In addition, although not clearly recorded, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unclearly recorded range.

[0020] The above-mentioned inventive content of the present application is not intended to describe each disclosed embodiment or each implementation in the present application. The following description more specifically illustrates an exemplary embodiment. In many places throughout the application, guidance is provided by a series of embodiments, which can be used in various combinations. In each example, the enumeration is only a representative group and should not be interpreted as exhaustive. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0022] In the construction of roads and bridges, waterproofing is an important factor in ensuring the quality of roads and bridges. However, in some actual engineering cases, there are phenomena of long-term water seepage and leakage on the road and bridge pavement due to poor waterproofing effect, which in turn causes problems such as cracks, collapses, and faults in the road surface, causing corrosion of the roadbed steel bars, resulting in roadbed damage and collapse, and ultimately having an adverse effect on the service life and driving safety of roads and bridges. As a waterproof material dedicated to roads and bridges, it needs to have a high technical threshold, especially to adapt to the special functional requirements and environmental conditions of road and bridge construction.

[0023] The existing road and bridge waterproofing membranes on the market are generally SBS or APP polymer modified asphalt waterproofing membranes. SBS modified asphalt membranes are not resistant to high temperatures, and the waterproofing layer is easily damaged when hot asphalt concrete materials are paved on the bridge deck. Although APP modified asphalt has good high temperature resistance, its low temperature performance, elasticity, and elongation are poor. After long-term use, the waterproofing layer on the surface of the road and bridge is prone to cracking, posing a risk of leakage.

[0024] In view of the above technical problems, an embodiment of the present application provides a modified asphalt composition that can simultaneously ensure the high temperature performance and low temperature resistance of the modified asphalt waterproof membrane.

[0025] The following first introduces the modified asphalt composition provided in the examples of the present application.

[0026] According to the present application, the modified asphalt composition comprises 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 the carbon fiber and SBS are interwoven to form a modified network, and the mass ratio of the carbon fiber to the SBS is 1:(4 to 6), for example, it can be 1:4, 1:4.5, 1:5, 1: The mass ratio of carbon fiber to composite asphalt is 1:(27-40), 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 additive is 1:(0.7-2), 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 found that the carbon fiber itself forms good adhesion with the non-polar substances in the asphalt, and at the same time promotes SBS to absorb the light components in the asphalt to fully swell, expand the molecular structure through high-speed shearing, and interweave with the carbon fiber through intermolecular van der Waals forces to form a more stable three-dimensional network structure, which reduces the asphalt segregation phase change and makes the whole system more stable. On this basis, 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 have a synergistic effect, while ensuring the mechanical properties of the modified asphalt composition, the high temperature stability is improved, and it can effectively resist the impact of hot paving of the road or bridge deck on the waterproof material. Moreover, when the mass ratio of carbon fiber to additive is 1: (0.7-2), the synergistic effect of carbon fiber and additive can improve the low-temperature brittleness of the carbon fiber-SBS modified network and the modified asphalt composition, and the low-temperature crack resistance is excellent, the waterproof layer is not easy to crack, and the environmental adaptability is strong.

[0028] In some embodiments, the mass percentage of carbon in the carbon fiber is ≥95wt%, for example, it can be 95wt%, 95.2wt%, 95.5wt%, 96wt%, 97wt%, 98wt%, or any combination of the above values; and / or, the bulk density of the carbon fiber is 700g / cm 3 ~850g / cm 3 , for example, can be 700g / cm 3 , 720g / cm 3 , 750g / cm 3 , 780g / cm 3 , 800g / cm 3 、820g / cm 3 、850g / cm 3 , or any combination range of the above numerical values; and / or, the median length of the carbon fiber is 75μm to 150μm, for example, it can be 75μm, 80μm, 90μm, 100μm, 110μm, 130μm, 150μm, or any combination range of the above numerical values, the average aspect ratio of the carbon fiber is (12-13):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 range of the above numerical values; and / or, the tensile strength of the carbon fiber is 2GPa to 3.5GPa, for example, it can be 2GPa, 2.2GPa, 2.5GPa, 3GPa, 3.5GPa, or any combination range of the above numerical values, preferably, 3GPa to 3.5Gpa; and / or, the carbon fiber is asphalt-based carbon fiber.

[0029] In some embodiments, 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, for example, it can be 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, or any combination range of the above numerical values; and / or, the needle penetration of the composite asphalt is 50-80 0.1mm / 25℃, for example, it can be 50 0.1mm / 25℃, 550.1mm / 25℃, 60 0.1mm / 25℃, 65 0.1mm / 25℃, 70 0.1mm / 25℃, 750.1mm / 25℃, 80 0.1mm / 25℃, or any combination range of the above numerical 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 range of the above numerical 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 120°C, 122°C, 125°C, 128°C, 130°C, 135°C, 140°C, or any combination of the above values; and / or the low-temperature flexibility of the modified asphalt composition is ≤-32°C, for example, it can be -40°C, -38°C, -36°C, -34°C, -32°C, or any combination of the above values, and the low-temperature flexibility after aging is ≤-28°C, for example, it can be -32°C, -31°C, -30°C, The low-temperature flexibility after 720 hours of artificial climate accelerated aging treatment is ≤-25°C, for example, it can be -32°C, -31°C, -30°C, -29°C, -28°C, -27°C, -26°C, -25°C, or any combination of the above values; 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 the above values.

[0032] In some embodiments, the softening oil is rubber oil and / or base oil, preferably, the CA content in the rubber oil is ≥30%, for example, it can be 30%, 32%, 35%, 38%, 40%, or any combination range of the above values, the Cp content in the base oil is ≥80%, for example, it can be 80%, 82%, 85%, 88%, 90%, or any combination range of the above values; and / or, the molecular weight of SBS is 170kDa to 210kDa, for example, it can be 170kDa, 180kDa, 190kDa, 200kDa, 210kDa, or any combination range of the above values, and the styrene content in SBS is 30% to 38%, for example, it can be 30%, 32%, 34%, 36%, 38%, or any combination range of the above values; and / or, the additive is a poly-alpha-olefin base oil, preferably, the kinematic viscosity of the poly-alpha-olefin base oil at 100°C is 14.5mm 2 / S~15mm 2 / S, for example, can be 14.5 mm 2 / S, 14.6mm 2 / S, 14.7mm 2 / S, 14.8mm 2 / S, 14.9mm 2 / S, 15mm 2 / S, or any combination range of the above numerical values, the freezing point of the poly-alpha-olefin base oil is -60°C to -55°C, for example, it can be -60°C, -59°C, -58°C, -57°C, -56°C, -55°C, or any combination range of the above numerical 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 range of the above numerical 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 range of the above numerical values.

[0033] In a second aspect, a method for preparing a modified asphalt composition comprises the following steps: mixing a composite asphalt and a softened oil, heating the temperature 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 the temperature 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 a 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 140°C, 145°C, 150°C, 155°C, 160°C, or any combination range of the above values; the first predetermined speed is 600r / min to 800r / min, for example, it can be 600r / min, 650r / min, 700r / min, 750r / min, 800r / min, or any combination range of the above values; the first predetermined time is 1.5h to 2h, for example, it can be 1.5h, 1.6h , 1.7h, 1.8h, 1.9h, 2.0h, or any combination range of the above values, the second predetermined temperature is 180°C to 190°C, for example, it can be 180°C, 182°C, 185°C, 188°C, 190°C, or any combination range of the above values, the second predetermined speed is 1000r / min to 1200r / min, for example, it can be 1000r / min, 1050r / min, 1100r / min, 1150r / min, 1200r / min, or any combination range of the above values. The third predetermined speed is 1200r / min to 1400r / min, for example, it can be 1200r / min, 1250r / min, 1300r / min, 1350r / min, 1400r / min, or any combination of the above values. The second predetermined time is 1h to 1.5h, for example, it can be 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h; the third predetermined temperature is 170℃ to 180℃, for example, it can be 170℃, 172℃, 175℃, 178℃ , 180℃, or any combination range of the above values, the fourth predetermined speed is 1200r / min~1400r / min, for example, it can be 1200r / min, 1250r / min, 1300r / min, 1350r / min, 1400r / min, or any combination range of the above values, the third predetermined time is 50min~60min, for example, it can be 50min, 52min, 54min, 56min, 58min, 60min, or any combination range of the above values.

[0035] In a third aspect, a modified asphalt waterproofing membrane comprises an upper protective layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a lower protective layer arranged in sequence; wherein the first modified asphalt layer and / or the second modified asphalt layer is made from the modified asphalt composition of the first aspect or the modified asphalt composition prepared by the preparation method of the second aspect.

[0036] In some embodiments, the upper protective layer is a mineral granular protective layer. Preferably, the particle size of the river sand in the mineral granular protective layer is 0.4 mm to 0.8 mm, for example, it can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or any combination range of the above values. The thickness of the mineral granular protective layer is 0.8 mm to 1.0 mm, for example, it can be 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, or any combination range of the above values; and / or, the first The thickness of the first modified asphalt layer and / or the second modified asphalt layer is 1.4 mm to 1.6 mm, for example, it can be 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, or any combination of the above values; and / or, the tread base is a polyester tread base obtained by pre-impregnation with silicone modified asphalt. Preferably, the modified silicone asphalt includes asphalt with a mass percentage of 95 wt% to 96 wt% and silicone with a mass percentage of 4 wt% to 5 wt%, and the gram weight of the polyester tread base is 345 g / m 2 ~355g / m 2 , for example, can be 345g / m 2 , 348g / m 2 , 350g / m 2 , 352g / m 2 , 345g / m 2 , or any combination of the above values. Pre-preg treatment with silica-modified asphalt can enhance the puncture resistance of the tire base and the corrosion resistance of the coil.

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

[0038] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] It should be understood that in the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0040] The following examples describe the present disclosure in more detail, and these examples are intended for illustrative purposes only.

[0041] Because various modifications and variations are obvious to those skilled in the art within the scope of the present disclosure. 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 according to conventional methods and can be used directly without further treatment, and the instruments used in the examples are commercially available.

[0042] Example 1

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

[0044] The mass percentage of carbon in the carbon fiber is ≥95wt%, and the bulk density of the carbon fiber is 760g / cm 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 asphalt-based carbon fiber.

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

[0046] Softening oil is used as base oil, and the Cp content in the base oil is ≥80%.

[0047] The molecular weight of SBS is about 200 kDa, and the styrene content in SBS is 35%.

[0048] The kinematic viscosity of poly-α-olefin base oil at 100°C is 14.94 mm 2 / S, the freezing 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 is prepared by the following method: composite asphalt and softening oil are mixed, the temperature is increased to 160°C, and stirred at 750r / min to obtain a first premix; SBS and carbon fiber are added to the first premix, the temperature is increased to 185°C, and the mixture is stirred at 1200r / min for 2h to obtain a second premix; rubber powder and additives are added to the second premix, and the mixture is stirred at a third predetermined speed for 1.5h to obtain a third premix; filler is added to the third premix, and the mixture is stirred at 189°C and 1400r / min for 60min to obtain a modified asphalt composition.

[0052] Embodiment 2-4

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

[0054] Table 1 Raw material ratios of modified asphalt compositions of Examples 1-4 and Comparative Examples 1-5

[0055]

[0056]

[0057] Embodiment 5-8

[0058] The preparation methods and raw material ratios of the modified asphalt compositions of Examples 5-8 are consistent with those of Example 1, except for the parameters of the carbon fibers, as detailed in Table 2.

[0059] Table 2 Parameters of carbon fibers of Example 1, Examples 5-8 and Comparative Examples 6-9

[0060]

[0061] Comparative Examples 1-5

[0062] The preparation methods of the asphalt compositions of Comparative Examples 1-5 are consistent with that of Example 1, except for the raw material composition and proportion of the modified asphalt compositions, as shown in Table 1 for details.

[0063] Comparative Examples 6-9

[0064] The preparation method and raw material ratio of the asphalt composition of Comparative Examples 6-9 are consistent with those of Example 1, except for the parameters of the carbon fiber, as shown in Table 2 for details.

[0065] The modified asphalt compositions of Examples 1-8 and the asphalt compositions of Comparative Examples 1-9 were subjected to performance tests, and 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 of standard TBT / T 2965-2018 "Waterproof Layer of Concrete Deck of Railway Bridges"; 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 test was performed according to T0709-2011, and the test results are shown in Table 3.

[0066] Table 3 Performance of asphalt compositions of Examples 1-8 and Comparative Examples 1-9

[0067]

[0068]

[0069] It can be seen from the above results that the modified asphalt composition provided in the present application has excellent high temperature resistance and low temperature flexibility through the regulation of special raw material ratios and carbon fiber parameters, and the synergistic effect of multiple factors. Moreover, after thermal aging and artificial climate accelerated aging, the low temperature flexibility of the material attenuates very little. At the same time, it has good wear resistance and good environmental adaptability.

[0070] Examples 9-16

[0071] The modified asphalt waterproofing roll material comprises an upper protective layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a lower protective layer which are arranged in sequence, wherein the first modified asphalt layer and the second modified asphalt layer are respectively prepared using the modified asphalt compositions of Examples 1-8 (that is, the modified asphalt composition of Example 1 is used to prepare the first modified asphalt layer and the second modified asphalt layer of Example 9, the modified asphalt composition of Example 2 is used to prepare the first modified asphalt layer and the second modified asphalt layer of Example 10, and so on), and the thickness of the first modified asphalt layer and the second modified asphalt layer is 1.5 mm.

[0072] The upper protective layer is a mineral granular protective layer, the mineral granular protective layer is river sand, the particle size of which is 0.6 mm, and the thickness of the upper protective layer is 0.9 mm. The lower protective layer is a polyester isolation film.

[0073] The tire base is made of a polyester tire base after being pre-impregnated with silicone modified asphalt. The modified silicone asphalt includes 95wt% of 70# asphalt and 5wt% of silicone. The silicone (purchased from Qingdao Chenrong New Materials Co., Ltd.) is specifically SiO 2 The silica gel powder has a content of about 98%, an average particle size of 1000 mesh, and a density of 0.28-0.3 kg / m 3The weight of polyester base is 350g / m 2 .

[0074] Embodiment 17

[0075] The modified asphalt waterproofing roll material is the same as that of Example 9 except for the base layer.

[0076] The tire base is made of polyester tire base after being pre-impregnated with tire base prepreg, and the tire base prepreg is composed of 80wt% 70# asphalt and 20wt% 10# asphalt; the weight of the polyester tire base is 350g / m 2 .

[0077] Comparative Example 10

[0078] Comparative Example 10 provides a common polymer modified asphalt waterproofing membrane, whose asphalt layer is composed of 45wt% asphalt, 11wt% base oil, 6wt% SBS, 2.5wt% APP, 12.5wt% rubber powder and 23wt% filler; its base prepreg is composed of 80wt% 70# asphalt and 20wt% 10# asphalt; its material structure is consistent with the membrane provided in Examples 9-17.

[0079] The performance tests were conducted on the modified asphalt waterproof membranes of Examples 9-17 and the asphalt waterproof membrane of Comparative Example 10. The products were tested in accordance with standard TBT / T 2965-2018. The test results are shown in Table 4.

[0080] Table 4 Performance of the modified asphalt waterproofing membranes of Examples 9-17 and the asphalt waterproofing membrane of Comparative Example 10

[0081]

[0082]

[0083] Compared with existing asphalt waterproof membranes, it can be seen from the above results that the modified asphalt waterproof membrane provided by the present application has excellent high temperature resistance, low temperature flexibility, physical and mechanical properties that can adapt to base deformation, and corrosion resistance in long-term underground environments. It can meet the complex environmental conditions during road and bridge construction and achieve reliable waterproofing effects.

[0084] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A modified asphalt 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, filler: 15-25 parts; Wherein, the carbon fiber and SBS are interwoven to form a modified network, and the mass ratio of the carbon fiber to SBS is 1:(4-6); The mass ratio of the carbon fiber to the composite asphalt is 1:(27-40); The mass ratio of the carbon fiber to the additive is 1:(0.7-2).

2. The modified asphalt composition according to claim 1, characterized in that: The mass percentage of carbon in the carbon fiber is ≥95wt%; And / or, the bulk density of the carbon fiber is 700g / cm 3 ~850g / cm 3 ; And / or, the median length of the carbon fiber is 75 μm to 150 μm, and the average aspect ratio of the carbon fiber is (12 to 13):1; And / or, the tensile strength of the carbon fiber is 2 GPa to 3.5 GPa, preferably 3 GPa to 3.5 GPa; And / or, the carbon fiber is asphalt-based carbon fiber.

3. The modified asphalt composition according to claim 1, characterized in that: The composite asphalt comprises a first matrix asphalt and a second matrix asphalt, wherein the mass ratio of the first matrix asphalt to the second matrix asphalt is (10-15):1; And / or, the penetration of the composite asphalt is 50-80 0.1 mm / 25°C, and the softening point of the composite asphalt is 52°C-65°C.

4. The modified asphalt composition according to claim 3, characterized in that: The first matrix asphalt is 70# asphalt or 90# asphalt, and the second matrix asphalt is 10# asphalt.

5. The modified asphalt composition according to claim 1, characterized in that: 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, the low-temperature flexibility after aging is ≤-28°C, and the low-temperature flexibility after 720h of artificial climate accelerated aging treatment is ≤-25°C; And / or, the Marshall stability of the modified asphalt composition is ≥6KN.

6. The modified asphalt composition according to any one of claims 1 to 5, characterized in that: The softening oil is rubber oil and / or base oil. Preferably, the CA content in the rubber oil is ≥30%, and the Cp content in the base oil is ≥80%; And / or, the molecular weight of the SBS is 170 kDa to 210 kDa, and the styrene content of the SBS is 30% to 38%; And / or, the auxiliary agent is a poly-alpha-olefin base oil, preferably, the kinematic viscosity of the poly-alpha-olefin base oil at 100°C is 14.5 mm 2 / S~15mm 2 / S, the freezing point of the poly-alpha-olefin base oil is -60°C to -55°C; And / or, the rubber powder is 80-mesh tire rubber powder, and preferably, the rubber content of the 80-mesh tire rubber powder is 75% to 80%; And / or, the filler is heavy calcium carbonate, and preferably, the fineness of the heavy calcium carbonate is 200-400 mesh.

7. A method for preparing a modified asphalt composition according to any one of claims 1 to 6, characterized in that: The following steps are involved: The composite asphalt and softened oil are mixed, the temperature is raised to a first predetermined temperature, and stirred 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 the additive to the second premix, and stirring at a third predetermined speed for a second predetermined time to obtain a third premix; Add filler to the third premix, and stir at a third predetermined temperature and a fourth predetermined rotation speed for a third predetermined time to obtain the modified asphalt composition.

8. The preparation method according to claim 7, characterized in that: The first predetermined temperature is 150° C. to 160° C., and the first predetermined rotation speed is 600 r / min to 800 r / min; The first predetermined time is 1.5 hours to 2 hours, the second predetermined temperature is 180° C. to 190° C., and the second predetermined speed is 1000 r / min to 1200 r / min; The third predetermined rotation speed is 1200 r / min to 1400 r / min, and the second predetermined time is 1 h to 1.5 h; The third predetermined temperature is 170° C. to 180° C., the fourth predetermined rotation speed is 1200 r / min to 1400 r / min, and the third predetermined time is 50 min to 60 min.

9. A modified asphalt waterproofing membrane, characterized in that: It comprises an upper protective layer, a first modified asphalt layer, a tread base layer, a second modified asphalt layer and a lower protective layer which are arranged in sequence; Wherein, the first modified asphalt layer and / or the second modified asphalt layer is made from the modified asphalt composition according to any one of claims 1 to 6 or the modified asphalt composition prepared by the preparation method according to any one of claims 7 to 8.

10. The modified asphalt waterproofing membrane according to claim 9, characterized in that: The upper protective layer is a mineral granular protective layer. Preferably, the particle size of the river sand in the mineral granular protective layer is 0.4 mm to 0.8 mm, and the thickness of the mineral granular 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 tire base is a polyester tire base that is pre-impregnated with silicone modified asphalt. Preferably, the silicone modified asphalt includes 95wt% to 96wt% of asphalt and 4wt% to 5wt% of silicone. The polyester tire base has a gram weight of 345g / m 2 ~355g / m 2 .

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