Preparation method of asphalt composition, asphalt composition, preparation method of asphalt coiled material and asphalt coiled material

Abstract

The invention discloses a preparation method of an asphalt composition, the asphalt composition, a preparation method of an asphalt coiled material and the asphalt coiled material. The preparation method comprises the following steps: mixing a modifier, first base oil and first matrix asphalt to obtain a first mixture; stirring and mixing second matrix asphalt and second base oil, adding a desulfurizing agent and a first preset amount of rubber powder, stirring, dispersing and grinding to obtain a first mixture; a second preset amount of rubber powder is added into the first mixture in multiple times, after the rubber powder is added for the last time, grinding treatment is conducted, and then heating stirring is conducted to obtain a second mixture; and mixing and stirring the first mixture and the second mixture, adding filling powder, and dispersing to obtain the asphalt composition. According to the preparation method of the asphalt composition, the content of soluble substances in the rubber powder in the asphalt composition can be increased, and meanwhile, the material temperature in the preparation process is reduced, so that the aging risk of SBS and SBR is reduced, and the low-temperature performance of the asphalt composition is improved.

Description

Technical Field

[0001] This application belongs to the field of building waterproofing materials technology, and particularly relates to a method for preparing an asphalt composition, an asphalt composition, a method for preparing an asphalt roll, and an asphalt roll. Background Technology

[0002] Currently, rubber powder is often added to asphalt roofing membranes to reduce the amount of high-value raw materials such as styrene-butadiene-styrene block copolymer (SBS) and styrene-butadiene rubber (SBR) and thus lower costs. However, as the amount of rubber powder increases in asphalt roofing membranes, the viscosity of the modified material increases, further causing problems such as abnormal product appearance and construction applicability. In addition, under low-temperature conditions, existing asphalt roofing membranes have poor low-temperature performance, with a sharp decrease in flexibility, becoming stiff and brittle. Summary of the Invention

[0003] This application provides a method for preparing an asphalt composition, an asphalt composition, a method for preparing asphalt rolls, and an asphalt roll. The method for preparing the asphalt composition can increase the content of soluble rubber powder in the asphalt composition, while reducing the material temperature during the preparation process, thereby reducing the aging risk of SBS and SBR and improving the low-temperature performance of the asphalt composition.

[0004] In a first aspect, a method for preparing an asphalt composition is provided, comprising: mixing a modifier, a first base oil, and a first matrix asphalt to obtain a first mixture, wherein the mass ratio of the modifier, the first matrix asphalt, and the first base oil is 1:(5-7):(2-4); mixing a second matrix asphalt and a second base oil, then adding a desulfurizer and a first predetermined amount of rubber powder, stirring, dispersing, and grinding to obtain a first mixture, wherein the first predetermined amount, by mass percentage, is 40%-60% of the total mass of the rubber powder; adding a second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating before the next addition of rubber powder, and after the last addition of rubber powder, grinding, heating, and stirring to obtain a second mixture, wherein the mass ratio of the total mass of the rubber powder to the second matrix asphalt is 0.25:1-0.9:1; mixing the first mixture and the second mixture in a mass ratio of 1:2-1:6, then adding filler powder and dispersing to obtain an asphalt composition.

[0005] In this embodiment, a desulfurizing agent is added during the rubber powder dispersion process, and multiple dispersions are employed, with the first addition of rubber powder accounting for 40% to 60% of the total mass of the rubber powder. This reduces the dispersion and depolymerization temperature of the rubber powder. Furthermore, the first and second mixtures are combined in a mass ratio of 1:2 to 1:6, with multiple agents working synergistically to effectively improve the dispersion of the rubber powder, thereby increasing the proportion of soluble matter in the final product. In addition, the desulfurized rubber and modifier are thoroughly mixed and interwoven under stirring to form a network, which improves the low-temperature performance, heat resistance, and joint peel strength of the asphalt membrane. Moreover, the first and second mixtures obtained using specific ratios in this application can meet the requirements of various asphalt waterproof membrane formulations for asphalt, rubber powder, and modifier proportions, significantly improving batching efficiency in actual production, allowing for on-demand use and high flexibility.

[0006] Meanwhile, the phased addition of rubber powder, combined with grinding and heating, avoids the sudden increase in equipment load and energy waste caused by adding a large amount at once. Early low-temperature grinding reduces the risk of overheating and degradation of the rubber powder, while gradual heating in the later stages specifically promotes the reaction, resulting in a more energy-efficient and effective overall process. Furthermore, the optimal dispersion conditions for modifiers and rubber powder differ; modifiers disperse better at specific temperatures and base oil ratios, while rubber powder requires special treatments such as phased heating and grinding. Preparing the first and second mixtures separately allows each raw material to be processed under its most suitable process parameters, avoiding insufficient dispersion or performance degradation of certain raw materials due to conflicting process conditions. This improves the stability of the entire production process and increases the product qualification rate.

[0007] In a first possible implementation, the steps of mixing the second base asphalt and the second base oil, adding a desulfurizing agent and a first predetermined amount of rubber powder, and then mixing, dispersing, and grinding to obtain a first mixture include: mixing the second base asphalt and the second base oil at 20 r / min to 50 r / min to obtain a first premix; heating the first premix to 155°C to 165°C, adding a desulfurizing agent and a first predetermined amount of rubber powder, mixing at 250 r / min to 300 r / min and heating to 170°C to 175°C, and then grinding to obtain the first mixture.

[0008] Combining the above possible implementation methods, the steps of adding a second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating before the next addition of rubber powder, and grinding and stirring after the last addition of rubber powder to obtain the second mixture include: heating the first mixture to 170℃~175℃, adding the second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating to 170℃~175℃ before the next addition of rubber powder, and after the last addition of rubber powder, heating to 170℃~175℃ to stop grinding and stirring at 250r / min~300r / min for 0.5h~1h to obtain the second mixture.

[0009] In the above possible implementations, the addition of the second predetermined amount of rubber powder in multiple stages can reduce the preparation temperature of the second mixture, thereby reducing the influence of temperature on the performance of the second mixture.

[0010] Combining the above possible implementation methods, the mass ratio of the desulfurizing agent to the total mass of the rubber powder is 1:24 to 1:300.

[0011] In the above possible implementations, this application can further improve the proportion of soluble matter in the final product and the low-temperature performance of the asphalt composition by controlling the mass ratio of desulfurizing agent to rubber powder.

[0012] In combination with the above possible implementations, the preparation method of the asphalt composition of this application satisfies at least one of the following: (1) The step of mixing and stirring the first mixture and the second mixture in a mass ratio of 1:2 to 1:6 and then adding filler powder to disperse and obtain the asphalt composition includes: mixing and stirring the first mixture and the second mixture in a mass ratio of 1:2 to 1:6 and then adding the remaining asphalt and the remaining base oil, and then adding filler powder to disperse and obtain the asphalt composition; (2) The step of mixing the modifier, the first base oil and the first matrix asphalt to obtain the first mixture includes: stirring and mixing the first matrix asphalt and the first base oil at a first predetermined stirring speed to obtain the second mixture, optionally, the first predetermined stirring speed is 20 r / min to 50 r / min; after the second mixture is heated to the first predetermined temperature, the modifier is added, and then the mixture is stirred and dispersed at the second predetermined stirring speed to obtain the third mixture, optionally, the first predetermined temperature is 155℃ to 165℃ and the second predetermined stirring speed is 25℃ to 50℃. 0r / min~300r / min, further optionally, the modifier includes at least one of SBS and SBR; after the third mixture is heated to the second predetermined temperature, the third mixture is ground for a first predetermined time, and after the grinding is completed, it is stirred at a third predetermined stirring speed for a third predetermined time to obtain the first mixture. Optionally, the second predetermined temperature is 180℃~185℃, the first predetermined time is 1h~2h, the third predetermined stirring speed is 250r / min~300r / min, and the third predetermined time is 0.5h~1h; (3) The step of mixing and stirring the first mixture and the second mixture in a mass ratio of 1:2~1:6 and then adding filler powder to disperse to obtain the asphalt composition includes: mixing and stirring the first mixture and the second mixture in a mass ratio of 1:2~1:6 at 250r / min~300r / min for 0.5h~1h, then adding the filler powder and mixing and stirring again for 0.5h~1h to obtain the asphalt composition.

[0013] In the above possible implementations, this application can effectively reduce the aging of the modifier by controlling the dispersion temperature and dispersion time of the modifier.

[0014] Secondly, an asphalt composition is prepared by the method of the first aspect. This asphalt composition can improve the low-temperature performance of asphalt rolls.

[0015] In one possible implementation, the asphalt roll material comprises the following raw material components in parts by weight: base asphalt, 33 to 48 parts; base oil, 6.5 to 8 parts; modifier, 2 to 5 parts; rubber powder, 12 to 30 parts; desulfurizer, 0.1 to 0.5 parts; and filler powder, 15 to 33 parts.

[0016] Optionally, the filler powder is an inorganic filler powder; optionally, the filler powder includes inorganic filler powder; optionally, the inorganic filler powder includes one or more of heavy calcium carbonate and talc.

[0017] In the above possible implementations, the asphalt composition of this application has a higher rubber powder content, and the cost of asphalt rolls can be further reduced by using the asphalt composition to prepare asphalt rolls.

[0018] Thirdly, a method for preparing asphalt rolls, wherein the asphalt composition prepared by the method of the first aspect and / or the asphalt composition of the second aspect are subjected to molding treatment to obtain asphalt rolls, wherein the asphalt rolls include at least one of a base-based asphalt roll and a non-reinforced self-adhesive asphalt roll.

[0019] In a first possible implementation, the preparation method of the asphalt roll material of this application satisfies at least one of the following: (1) the asphalt roll material is a base asphalt roll material, and the preparation method of the asphalt roll material includes: mixing the asphalt composition with a crosslinking agent and then performing a molding treatment to obtain the base asphalt roll material. Preferably, the mass ratio of the crosslinking agent to the total mass of the rubber powder is 1:24 to 1:300; (2) the step of mixing the asphalt composition with a crosslinking agent and then performing a molding treatment to obtain the base asphalt roll material includes: adding a crosslinking agent to the asphalt composition 0.4h to 0.5h before preparing the base asphalt roll material and mixing it at a stirring speed of 250r / min to 300r / min, and then performing a molding treatment at 140℃ to 150℃ to obtain the base asphalt roll material. Optionally, the cooling method of the molding treatment includes spray cooling, and the molding speed of the molding treatment is 20m / min to 40m / min.

[0020] In the above-mentioned possible implementations, the desulfurized rubber powder and modifier in this application undergo chemical cross-linking under the action of the cross-linking agent, forming a more stable cross-linked network and improving the low-temperature performance, heat resistance, and joint peel strength of the asphalt membrane. Furthermore, by controlling the mass ratio of the cross-linking agent to the rubber powder, the low-temperature performance, heat resistance, and joint peel strength of the asphalt membrane can be further improved.

[0021] Furthermore, the preparation method of this application can reduce the material temperature during the preparation of asphalt-based roofing membranes by controlling the addition time of the asphalt mixture and the crosslinking agent. Further, by controlling the cooling method and molding speed, the crosslinking effect of the crosslinking agent can be improved, thereby further enhancing the performance of the asphalt roofing membranes.

[0022] Fourthly, an asphalt roll material is prepared by the preparation method described in the third aspect.

[0023] In the first possible implementation, the bitumen roll comprises the following raw material components in parts by weight:

[0024] Base asphalt, 33 to 48 parts; base oil, 6.5 to 8 parts; modifier, 2 to 5 parts; rubber powder, 12 to 30 parts; desulfurizer, 0.1 to 0.5 parts; crosslinking agent, 0.1 to 0.5 parts, optionally, the crosslinking agent is a vulcanizing agent; filler powder, 15 to 33 parts, optionally, the filler powder includes inorganic filler powder, optionally, the inorganic filler powder includes at least one of heavy calcium carbonate and talc powder. Detailed Implementation

[0025] 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 specific embodiments. It should be understood that the specific embodiments described herein are intended only 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 of this application.

[0026] 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.

[0027] 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.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] Currently, rubber powder is often added to asphalt roofing membranes to reduce the amount of high-value raw materials such as styrene-butadiene-styrene block copolymer (SBS) and styrene-butadiene rubber (SBR) and thus lower costs. However, the existing technology has the following problems:

[0030] 1. In existing technologies, to facilitate the dispersion and depolymerization of SBS and recycled rubber powder, large rubber particles are transformed into smaller, uniformly dispersed rubber particles in asphalt, thereby altering the temperature sensitivity of the asphalt. The rubber powder is vulcanized rubber, and its depolymerization requires specific temperature, stirring speed, and stirring time. Ideally, the temperature should not exceed 220 degrees Celsius, but considering the aging and dispersion temperature of SBS, the upper limit of the batching temperature is generally controlled to be no higher than 195 degrees Celsius. At this temperature, light components in the asphalt and oil volatilize (weight loss is approximately 1%). To compensate for the volatilization and maintain the product's low-temperature flexibility, additional oil is needed. To meet environmental requirements, the volatilized light components require treatment using a regenerative thermal oxidizer (RTO), which incurs high operating costs. Furthermore, the presence of granular and powdered rubber raw materials at this temperature increases the risk of spontaneous combustion, potentially leading to flash explosions and fires in the system. In addition, after the ingredients are mixed, the temperature of the material inside the kettle is between 170℃ and 180℃. During the asphalt roll forming process, a large amount of smoke will be emitted, which will further increase the processing pressure of the environmental protection equipment. Moreover, the materials used to form the membrane are polyethylene (PE) and polyethylene terephthalate (PET). The high temperature and forming tension can easily cause the membrane to deform and affect the appearance of the product.

[0031] 2. In existing technologies, the soluble content of recycled rubber powder, when formulated using conventional processes, is approximately 15%. Repeated grinding with a colloid mill can achieve a soluble content of up to 20%. Increasing the soluble content of recycled rubber powder can reduce the amount of high-value raw materials (base asphalt, base oil, etc.), thus lowering costs. However, repeated grinding with a colloid mill increases energy consumption and causes a continuous rise in material temperature, which is detrimental to both cost and product quality. Due to the oil absorption and swelling characteristics of recycled rubber powder, the amount of unrecycled rubber powder in the formulation should generally not exceed 14%. Increasing the amount further will result in excessively high viscosity of the modified material, making proper mixing and dispersion impossible.

[0032] 3. The higher the mesh size of the rubber powder, the higher the procurement cost. When using small-mesh rubber powder, the rubber powder is prone to incomplete deagglomeration, resulting in obvious modification of the modified material particles and excessive viscosity; this greatly affects the product's appearance and application performance.

[0033] In view of the above-mentioned technical problems, the present application provides a method for preparing an asphalt composition, an asphalt composition, a method for preparing asphalt rolls, and an asphalt roll. The method for preparing the asphalt composition can increase the content of soluble rubber powder in the asphalt composition, and at the same time, reduce the material temperature during the preparation process, thereby reducing the aging risk of SBS and SBR and improving the low-temperature performance of the asphalt composition.

[0034] The preparation method of the asphalt composition provided in the embodiments of this application will be described first below.

[0035] According to this application, a method for preparing an asphalt composition includes: mixing a modifier, a first base oil, and a first matrix asphalt to obtain a first mixture, wherein the mass ratio of the modifier, the first matrix asphalt, and the first base oil is 1:(5-7):(2-4); mixing a second matrix asphalt and a second base oil, then adding a desulfurizer and a first predetermined amount of rubber powder, stirring, dispersing, and grinding to obtain a first mixture, wherein the first predetermined amount, by mass percentage, is 40%-60% of the total mass of the rubber powder; adding a second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating before the next addition of rubber powder, and after the last addition of rubber powder, grinding, heating, and stirring to obtain a second mixture, wherein the mass ratio of the total mass of the rubber powder to the second matrix asphalt is 0.25:1-0.9:1; mixing the first mixture and the second mixture in a mass ratio of 1:2-1:6, then adding filler powder and dispersing to obtain an asphalt composition.

[0036] In the embodiments of this application, the mass ratio of the modifier, the first base asphalt, and the first base oil is 1:5:2, 1:6:2, 1:7:2, 1:5:3, 1:6:3, 1:7:3, 1:5:4, 1:6:4, 1:7:4, or any combination of the above values. The first predetermined amount can be 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, or any combination of the above values ​​of the total mass of the rubber powder. The mass ratio of the total mass of the rubber powder to the second base asphalt can be 0.3:1, 0.4:1, 0.5:1, 0.9:1, 0.7:1, 0.8:1, 0.9:1, or any combination of the above values. The mass ratio of the first mixture to the second mixture can be 1:2, 1:3, 1:4, 1:5, 1:6, or any combination of the above values. The first base asphalt and the second base asphalt can be the same or different, and the first base oil and the second base oil can be the same or different.

[0037] The inventors discovered that adding a desulfurizing agent during the rubber powder dispersion process, and employing a multi-stage dispersion method with the first addition of rubber powder accounting for 40% to 60% of the total mass of the rubber powder, lowers the dispersion and depolymerization temperatures of the rubber powder. Furthermore, by using a first and second mixture in a mass ratio of 1:2 to 1:6, the synergistic effect of the two mixtures effectively improves the dispersion of the rubber powder, thereby increasing the proportion of soluble matter in the final product. In addition, it can improve the low-temperature performance, heat resistance, and joint peel strength of the asphalt composition.

[0038] Meanwhile, the phased addition of rubber powder, combined with grinding and heating, avoids the sudden increase in equipment load and energy waste caused by adding a large amount at once. Early low-temperature grinding reduces the risk of overheating and degradation of the rubber powder, while gradual heating in the later stages specifically promotes the reaction, resulting in a more energy-efficient and effective overall process. Furthermore, the optimal dispersion conditions for modifiers and rubber powder differ; modifiers disperse better at specific temperatures and base oil ratios, while rubber powder requires special treatments such as phased heating and grinding. Preparing the first and second mixtures separately allows each raw material to be processed under its most suitable process parameters, avoiding insufficient dispersion or performance degradation of certain raw materials due to conflicting process conditions. This improves the stability of the entire production process and increases the product qualification rate.

[0039] In some embodiments, the step of mixing the second base asphalt and the second base oil, adding a desulfurizing agent and a first predetermined amount of rubber powder, and then mixing, dispersing, and grinding to obtain a first mixture includes: mixing the second base asphalt and the second base oil at 20 r / min to 50 r / min to obtain a first premix, for example, the mixing speed can be 20 r / min, 25 r / min, 30 r / min, 35 r / min, 40 r / min, 45 r / min, 50 r / min, or higher values. Any combination range; after heating the first premix to 155℃~165℃, for example, it can be any combination range of 155℃, 158℃, 160℃, 162℃, 165℃ or above, add desulfurizing agent and a first predetermined amount of rubber powder, stir at 250r / min~300r / min and heat to 170℃~175℃, for example, it can be any combination range of 170℃, 171℃, 172℃, 173℃, 174℃, 175℃ or above, and grind to obtain the first mixture.

[0040] In some embodiments, the step of adding a second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating before the next addition of rubber powder, and grinding and stirring after the last addition of rubber powder to obtain a second mixture includes: heating the first mixture to 170°C to 175°C, adding the second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition of rubber powder, heating to 170°C to 175°C before the next addition of rubber powder, and after the last addition of rubber powder, heating to 170°C to 175°C, stopping grinding, and stirring at 250 r / min to 300 r / min for 0.5 h to 1 h to obtain a second mixture.

[0041] In the above embodiments, the addition of the second predetermined amount of rubber powder in multiple batches can reduce the preparation temperature of the second mixture, thereby reducing the influence of temperature on the performance of the second mixture.

[0042] In some embodiments, a second predetermined amount of rubber powder is added to the first mixture in 2 to 4 portions; optionally, the second predetermined amount of rubber powder is added to the first mixture in two portions.

[0043] In the above embodiments, this application can improve the desulfurization effect of rubber powder and further reduce the dispersion temperature and depolymerization temperature of rubber powder by controlling the number of times rubber powder is added and the amount of rubber powder added each time.

[0044] In some embodiments, the mass ratio of the desulfurizing agent to the total mass of the rubber powder is 1:24 to 1:300, for example, it can be 1:24, 1:30, 1:50, 1:100, 1:150, 1:200, 1:250, 1:300, or any combination of the above values.

[0045] In the above embodiments, by controlling the mass ratio of desulfurizer to rubber powder, this application can further improve the proportion of soluble matter in the final product and the low-temperature performance of the asphalt composition.

[0046] In some embodiments, the rubber powder in the preparation method of the asphalt roll material of this application satisfies at least one of the following: the particle size of the rubber powder is 40 mesh to 60 mesh, for example, it can be any combination of 40 mesh, 42 mesh, 45 mesh, 48 mesh, 50 mesh, 52 mesh, 55 mesh, 58 mesh, 60 mesh, or higher; the mass percentage of ash content of the rubber powder is ≤10%, for example, it can be any combination of 10%, 9.5%, 9%, 8.5%, 8%, 7.5%, 7%, 6.5%, 6%, 5.5%, 5%, or higher; the mass percentage of rubber hydrocarbon content of the rubber powder is ≥45%, for example, it can be any combination of 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or higher; the bulk density of the rubber powder is 260 kg / m³. 3 ~380kg / m 3 The rubber powder is one or more types of vulcanized rubber used in wheel rubber, and optionally, the rubber powder is vulcanized rubber for all-steel radial tires.

[0047] In the above embodiments, the rubber powder with a particle size of 40-60 mesh can further reduce the cost of asphalt rolls. At the same time, using rubber powder with the above-mentioned ash content, rubber hydrocarbon content or bulk density can further improve the performance of the asphalt composition of this application.

[0048] In some embodiments, the step of mixing the modifier, the first base oil, and the first base asphalt to obtain a first mixture includes: mixing the first base asphalt and the first base oil at a first predetermined stirring speed to obtain a second mixture. Optionally, the first predetermined stirring speed is 20 r / min to 50 r / min, for example, it can be any combination of 20 r / min, 25 r / min, 30 r / min, 35 r / min, 40 r / min, 45 r / min, 50 r / min, or the above values; and then heating the second mixture to a first predetermined temperature. A modifier is then added, and the mixture is stirred and dispersed at a second predetermined stirring speed to obtain a third mixture. Optionally, the first predetermined temperature is 155℃~165℃, for example, it can be any combination of 155℃, 158℃, 160℃, 162℃, 165℃, or higher values; the second predetermined stirring speed is 250r / min~300r / min, for example, it can be any combination of 250r / min, 260r / min, 270r / min, 280r / min, 290r / min, 300r / min, or higher values. The modifier may further include at least one of SBS and SBR. After the third mixture is heated to the second predetermined temperature, the third mixture is ground for a first predetermined time. After the grinding is completed, the mixture is stirred at a third predetermined stirring speed for a third predetermined time to obtain the first mixture. Optionally, the second predetermined temperature is 180℃~185℃, for example, it can be 180℃, 181℃, 182℃, 183℃, 184℃, 185℃, or any combination of the above values; the first predetermined time is 1h~2h, for example, it can be 1h, 1.2h, or 1h. The third predetermined stirring speed is 250 r / min to 300 r / min, for example, it can be any combination of 250 r / min, 260 r / min, 270 r / min, 280 r / min, 290 r / min, 300 r / min, or any combination of the above values; the third predetermined time is 0.5 h to 1 h, for example, it can be any combination of 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, or any combination of the above values.

[0049] In the above embodiments, by controlling the dispersion temperature and dispersion time of the modifier, the aging of the modifier can be effectively reduced.

[0050] In some embodiments, the step of mixing the first mixture and the second mixture in a mass ratio of 1:2 to 1:6 and then adding filler powder to disperse the mixture to obtain an asphalt composition includes: mixing the first mixture and the second mixture in a mass ratio of 1:2 to 1:6, adding the remaining asphalt and the remaining base oil, and then adding filler powder to disperse the mixture to obtain an asphalt composition.

[0051] In some embodiments, the step of mixing and stirring the first mixture and the second mixture at a mass ratio of 1:2 to 1:6 and then adding filler powder to disperse them to obtain an asphalt composition includes: mixing and stirring the first mixture and the second mixture at a mass ratio of 1:2 to 1:6 at 250 r / min to 300 r / min for 0.5 h to 1 h, then adding the filler powder and mixing and stirring again for 0.5 h to 1 h to obtain the asphalt composition.

[0052] Secondly, an asphalt composition is prepared by the above-described preparation method. This asphalt composition can improve the low-temperature performance of asphalt rolls.

[0053] In some embodiments, the asphalt roll material comprises the following raw material components in parts by weight: base asphalt, 33 to 48 parts; base oil, 6.5 to 8 parts; modifier, 2 to 3 parts; rubber powder, 12 to 30 parts; desulfurizer, 0.1 to 0.5 parts; and filler powder, 15 to 33 parts. Optionally, the filler powder is inorganic filler powder. Further optionally, the filler powder includes one or more of heavy calcium carbonate and talc powder.

[0054] In the above embodiments, the asphalt composition roll material of this application has a higher rubber powder content than existing asphalt roll materials. While improving the heat resistance and joint peel strength of the asphalt roll material prepared using the asphalt composition, it can further reduce the cost of the asphalt roll material.

[0055] Thirdly, a method for preparing asphalt rolls, wherein the asphalt composition prepared by the method of the first aspect and / or the asphalt composition of the second aspect are subjected to molding treatment to obtain asphalt rolls, wherein the asphalt rolls include at least one of a base-based asphalt roll and a non-reinforced self-adhesive asphalt roll.

[0056] In some embodiments, the asphalt roll is a base asphalt roll, and the preparation method of the asphalt roll includes: mixing the asphalt composition with a crosslinking agent and then molding it to obtain the base asphalt roll. Optionally, the mass ratio of the crosslinking agent to the total mass of the rubber powder is 1:24 to 1:300, for example, it can be 1:24, 1:30, 1:50, 1:100, 1:150, 1:200, 1:250, 1:300, or any combination of the above values.

[0057] In the above embodiments, by controlling the mass ratio of crosslinking agent to rubber powder, this application can further improve the low-temperature performance, heat resistance and joint peel strength of asphalt rolls.

[0058] In some embodiments, the step of mixing the asphalt composition with a crosslinking agent and then molding it to obtain a base asphalt roofing membrane includes: adding a crosslinking agent to the asphalt composition 0.4h to 0.5h before preparing the base asphalt roofing membrane and mixing it at a stirring speed of 250r / min to 300r / min, and then molding it at 140℃ to 150℃ to obtain the base asphalt roofing membrane. Optionally, the cooling method for the molding process includes spray cooling. The molding speed of the molding process is 20m / min to 40m / min, for example, it can be 20m / min, 22m / min, 25m / min, 28m / min, 30m / min, 32m / min, 35m / min, 38m / min, 40m / min, or any combination of the above values.

[0059] In the above embodiments, the preparation method of this application can reduce the material temperature during the preparation of the asphalt-based roofing membrane by controlling the addition time of the asphalt mixture and the crosslinking agent. Furthermore, by controlling the cooling method and molding speed, the crosslinking effect of the crosslinking agent can be improved, thereby further enhancing the performance of the asphalt roofing membrane.

[0060] In the above embodiments, the preparation method of this application can improve the crosslinking effect of the crosslinking agent by controlling the cooling method and molding speed, thereby further improving the performance of the asphalt roll material.

[0061] Fourthly, an asphalt roll material is prepared by the preparation method described in the third aspect.

[0062] In some embodiments, the bituminous roll material comprises the following raw material components in parts by weight:

[0063] Base asphalt, 33 to 48 parts; base oil, 6.5 to 8 parts; modifier, 2 to 3 parts; rubber powder, 12 to 30 parts; desulfurizer, 0.1 to 0.5 parts; crosslinking agent, 0.1 to 0.5 parts, optionally, the crosslinking agent is a vulcanizing agent; filler powder, 15 to 33 parts, optionally, the filler powder includes at least one of heavy calcium carbonate and talc powder.

[0064] 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.

[0065] 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.

[0066] Example

[0067] The following embodiments describe the contents disclosed in this application in more detail. These embodiments are for illustrative purposes only.

[0068] 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.

[0069] In this embodiment, the rubber powder is recycled rubber powder, specifically recycled tire rubber powder, and the mesh size of the rubber powder is 40-60 mesh.

[0070] The rubber powder comes from Hengshui Fuying Rubber Products Co., Ltd., and is recycled radial tire powder.

[0071] The base asphalt is 70# asphalt from Shandong Jingbo Petrochemical Co., Ltd.

[0072] The base oil is naphthenic oil from Yueyang Zhongbao Supply Chain Management Service Co., Ltd.

[0073] SBS is a styrene-butadiene-styrene block copolymer produced by Tianjin LG Botian Chemical Co., Ltd.

[0074] SBR is the name of Shandong Gaoshi Science & Industry Trade Co., Ltd., and it is a type of styrene-butadiene rubber.

[0075] The desulfurizing agent is from Anhui Ruida Rubber Technology Co., Ltd., and is an alkylphenol sulfide.

[0076] The crosslinking agent is Guangdong Huiheng New Material Technology Co., Ltd., and the silane coupling agent is mercaptosilane KH580. The filler powder is Dezhou Guangjinyuan Building Materials Sales Co., Ltd., and the filler is heavy calcium carbonate.

[0077] In this application, the proportion of soluble matter in rubber powder is calculated by the following method: the soluble matter in the base asphalt, base oil, and modifier is assumed to be 100%, the proportion of base asphalt, oil, and modifier in the formulation is A, and the additional part of the total soluble matter content S is provided by rubber powder, that is, the proportion of rubber powder in the formulation X provides the soluble matter of SA, and the proportion of soluble matter in rubber powder is (SA) / X.

[0078] Example 1

[0079] A hot-melt roofing membrane bitumen composition, by weight percentage, comprises 45.0 parts of base bitumen, 8 parts of base oil, 2.0 parts of SBS, 28 parts of 60-mesh rubber powder, 0.2 parts of desulfurizer and 16.8 parts of filler powder.

[0080] The asphalt composition was prepared by the following method:

[0081] After adding the first base asphalt (12 parts base asphalt) and the first base oil (4 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0082] The second mixture was heated to 160°C, and 2 parts of SBS were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0083] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0084] The second base asphalt (33 parts base asphalt) and the second base oil (4 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0085] After heating the first premix to 160°C, add 11.2 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0086] After the first mixture is heated to 170°C, 8.4 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 8.4 parts of rubber powder are added for grinding. Grinding is stopped after the temperature is raised to 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0087] The first and second mixtures were mixed and stirred at 300 rpm for 0.5 h. Then, 16.8 parts of filler powder were added and dispersed for 0.5 h to obtain an asphalt composition. Testing showed that the total soluble content of this asphalt composition was 64.8%, the rubber powder soluble content was 35%, and the viscosity of the asphalt composition was 20000 mPa·s.

[0088] Example 2

[0089] The only difference between Example 2 and Example 1 is that in this example, the raw materials of the rubber composition contain 0.5 parts of desulfurizer and 16.5 parts of filler powder. Testing revealed that the total soluble matter content of this asphalt composition was 67.6%, the soluble matter content of the rubber powder was 45%, and the viscosity of the asphalt composition was 10000 mPa·s.

[0090] Comparative Example 1

[0091] An asphalt composition was prepared by directly mixing 45.0 parts of base asphalt, 8 parts of base oil, 2.0 parts of SBS, 18 parts of 60-mesh rubber powder, and 27 parts of filler powder. The viscosity exceeded the standard, making it impossible to formulate the material.

[0092] Example 3

[0093] A hot-melt asphalt roll material is prepared by the following method:

[0094] 0.5 hours before roll production, the asphalt composition of Example 1 was subjected to molding treatment at 160℃~165℃, and water cooling was used during molding; the molding speed was 30m / min to ensure the cooling effect, and hot melt asphalt roll was obtained.

[0095] Example 4

[0096] A hot-melt roll asphalt composition, by weight, comprises 45.0 parts of base asphalt, 6.5 parts of base oil, 2.0 parts of SBS, 18.0 parts of 60-mesh rubber powder, 0.2 parts of desulfurizer, 0.2 parts of crosslinking agent, and 28.1 parts of filler powder.

[0097] Hot-melt asphalt roofing membrane is prepared by the following method:

[0098] After adding the first base asphalt (12 parts base asphalt) and the first base oil (4 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0099] The second mixture was heated to 160°C, and 2 parts of modifier were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0100] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0101] The second base asphalt (33 parts base asphalt) and the second base oil (2.5 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0102] After heating the first premix to 160°C, add 7.2 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0103] After the first mixture is heated to 170°C, 5.4 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 5.4 parts of rubber powder are added for grinding. Grinding is stopped after the temperature is raised to 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0104] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 28.1 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0105] 0.2 parts of vulcanizing agent are added 0.5 hours before production. After adding the vulcanizing agent, the mixture is stirred to prevent vulcanization in the kettle. The molding process is carried out at 160℃~165℃. Spray cooling is used during molding instead of water immersion cooling in order to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, and hot melt asphalt rolls are obtained.

[0106] Example 5

[0107] A hot-melt roll asphalt composition, by weight, comprises 45.0 parts of base asphalt, 8 parts of base oil, 2.0 parts of SBS, 18.0 parts of 60-mesh rubber powder, 0.2 parts of desulfurizer, 0.2 parts of crosslinking agent and 26.6 parts of filler powder.

[0108] Hot-melt asphalt roofing membrane is prepared by the following method:

[0109] After adding the first base asphalt (12 parts base asphalt) and the first base oil (4 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0110] The second mixture was heated to 160°C and 2 parts of modifier (SBS) were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0111] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0112] The second base asphalt (33 parts base asphalt) and the second base oil (2.5 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0113] After heating the first premix to 160°C, add 7.2 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0114] After the first mixture is heated to 170°C, 5.4 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 5.4 parts of rubber powder are added for grinding. Grinding is stopped after the temperature is raised to 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0115] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 26.6 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0116] 0.2 parts of vulcanizing agent and 1.5 parts of base oil are added 0.5 hours before production. After the vulcanizing agent is added, high-speed stirring is maintained to prevent vulcanization in the kettle. Molding is carried out at 160℃~165℃. Spray cooling is used instead of water immersion cooling during molding to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, and hot melt asphalt rolls are obtained.

[0117] Example 6

[0118] A hot-melt roll asphalt composition, by weight, comprises 45.0 parts of base asphalt, 8 parts of base oil, 2.0 parts of SBS, 28.0 parts of 60-mesh rubber powder, 0.5 parts of desulfurizer, 0.2 parts of crosslinking agent, and 16.3 parts of filler powder.

[0119] Hot-melt asphalt roofing membrane is prepared by the following method:

[0120] After adding the first base asphalt (12 parts base asphalt) and the first base oil (4 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0121] The second mixture was heated to 160°C, and 2 parts of modifier were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0122] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0123] The second base asphalt (33 parts base asphalt) and the second base oil (2.5 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0124] After heating the first premix to 160°C, add 11.2 parts of rubber powder and 0.5 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0125] After the first mixture is heated to 170°C, 8.4 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 8.4 parts of rubber powder are added for grinding. Grinding is stopped after the temperature is raised to 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0126] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 28.1 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0127] 0.2 parts of vulcanizing agent and 1.5 parts of base oil are added 0.5 hours before production. After adding the vulcanizing agent, stir to prevent vulcanization in the kettle. Molding is carried out at 160℃~165℃. Spray cooling is used instead of water immersion cooling during molding to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, and hot melt asphalt roll material is obtained.

[0128] Example 7

[0129] A self-adhesive, wet-laying roll asphalt composition, comprising, by weight, 48.0 parts of base asphalt, 8 parts of base oil, 3.0 parts of SBS, 12.0 parts of 60-mesh rubber powder, 0.2 parts of desulfurizer, 0.2 parts of crosslinking agent, and 28.6 parts of filler powder.

[0130] Self-adhesive, wet-laid asphalt roofing membranes are prepared using the following methods:

[0131] After adding the first base asphalt (18 parts base asphalt) and the first base oil (6 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0132] After heating the second mixture to 160°C, add 3 parts of modifier and stir at 300 r / min to obtain the third mixture.

[0133] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0134] The second base asphalt (30 parts base asphalt) and the second base oil (2 parts base oil) are mixed at 50 r / min to obtain the first premix.

[0135] After heating the first premix to 160°C, add 4.8 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0136] After the first mixture is heated to 170°C, 3.6 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 3.6 parts of rubber powder are added for grinding. Grinding is stopped after the temperature reaches 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0137] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 28.6 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0138] Add 0.2 parts of vulcanizing agent 0.5 hours before production. Stir after adding the vulcanizing agent to prevent vulcanization in the kettle. Molding is carried out at 160℃~165℃. Spray cooling is used during molding instead of water immersion cooling to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, resulting in self-adhesive, wet-laid asphalt rolls.

[0139] Example 8

[0140] The difference between Example 8 and Example 5 is that the first mixture is heated to 175°C, and a second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, grinding is performed, and the temperature is raised to 175°C for the next addition of rubber powder. After the last addition of rubber powder, grinding is performed, and the temperature is raised to 175°C to stop grinding and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0141] Comparative Example 2

[0142] The difference between Comparative Example 2 and Example 5 is that the first mixture is heated to 150°C, and a second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, grinding is performed, and the temperature is raised to 150°C for the next addition of rubber powder. After the last addition of rubber powder, grinding is performed, and the temperature is raised to 150°C to stop grinding and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0143] Comparative Example 3

[0144] The difference between Comparative Example 3 and Example 5 is that the first mixture is heated to 160°C, and a second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, grinding is performed, and the temperature is raised to 160°C for the next addition of rubber powder. After the last addition of rubber powder, grinding is performed, and the temperature is raised to 160°C to stop grinding and the mixture is stirred at 300 r / min for 1 h to obtain the second mixture.

[0145] Comparative Example 4

[0146] The difference between Comparative Example 4 and Example 5 is that the first mixture is heated to 180°C, and a second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, grinding is performed, and the temperature is raised to 180°C for the next addition of rubber powder. After the last addition of rubber powder, grinding is performed, and the temperature is raised to 180°C to stop grinding and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0147] Comparative Example 5

[0148] Asphalt roofing membranes are prepared using existing processes and raw material formulations. By weight, the raw materials for the asphalt roofing membranes include 48 parts base asphalt, 8 parts base oil, 2 parts SBS, 12 parts 60-mesh rubber powder, and 33 parts filler. Specifically, the asphalt roofing membranes are prepared using the following method:

[0149] The base asphalt and base oil are mixed at 50 r / min, then the temperature is raised to 160℃ and modifier and rubber powder are added, and then the mixture is stirred at 300 r / min.

[0150] Grinding is carried out after heating to 160℃~170℃. Heating is stopped when the temperature reaches 180℃~185℃; grinding is stopped when the temperature reaches 190℃. After continuous high-speed stirring for 1 hour, filler is added, and high-speed stirring is continued for another 45 minutes before molding to obtain the asphalt-based roll material.

[0151] Comparative Example 6

[0152] The difference between Comparative Example 6 and Comparative Example 5 is that, by mass parts, the raw materials of the asphalt roll include 48 parts of base asphalt, 8 parts of base oil, 2 parts of SBS, 15 parts of rubber powder, and 30 parts of filler.

[0153] Comparative Example 7

[0154] The difference between Comparative Example 7 and Example 5 is that the asphalt roll was prepared by the following method:

[0155] After adding 45 parts of base asphalt and 8 parts of base oil to the batching tank, the mixture is stirred at 50 r / min to obtain the second mixture.

[0156] The second mixture was heated to 160°C and 2.0 parts of SBS modifier were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0157] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0158] After heating the first mixture to 160°C, add 7.2 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0159] After the first mixture is heated to 170°C, 5.4 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 5.4 parts of rubber powder are added for grinding. Grinding is stopped after the temperature is raised to 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0160] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 26.6 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0161] 0.2 parts of vulcanizing agent and 1.5 parts of base oil are added 0.5 hours before production. After the vulcanizing agent is added, high-speed stirring is maintained to prevent vulcanization in the kettle. Molding is carried out at 160℃~165℃. Spray cooling is used instead of water immersion cooling during molding to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, and the asphalt-based roll material is obtained.

[0162] Comparative Example 8

[0163] The difference between Comparative Example 8 and Example 5 is that the asphalt roll was prepared by the following method:

[0164] After adding the first base asphalt (12 parts base asphalt) and the first base oil (4 parts base oil) into the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0165] The second mixture was heated to 160°C, and 2 parts of modifier were added. The mixture was stirred at 300 r / min to obtain the third mixture.

[0166] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0167] The second base asphalt (33 parts base asphalt) and the second base oil (2.5 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0168] After heating the first premix to 160°C, add 18 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat to 160°C again, and then grind. After heating to 170°C, stop grinding and stir at 300 r / min for 1 hour to obtain the second mixture.

[0169] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 26.6 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0170] 0.2 parts of vulcanizing agent and 1.5 parts of base oil are added 0.5 hours before production. After the vulcanizing agent is added, high-speed stirring is maintained to prevent vulcanization in the kettle. Molding is carried out at 160℃~165℃. Spray cooling is used instead of water immersion cooling during molding to maintain a certain temperature and ensure the vulcanization effect. The molding speed is 30m / min to ensure the cooling effect, and hot melt asphalt rolls are obtained.

[0171] The low-temperature flexibility limit temperature, heat resistance (GB / T 328.11-2007) limit temperature, soluble content (GB / T 328.26-2007), and joint peel strength (GB / T 328.20-2007) of the asphalt rolls prepared in Examples 3-8 were tested using the GB / T 328-2007 test method. The test results are shown in Table 1.

[0172] Table 1 Performance tests of Examples 3-8 and Comparative Examples 2-8

[0173]

[0174]

[0175] As shown in Table 1, the asphalt composition prepared by the method of this application has a suitable viscosity. Using the asphalt composition of this application can significantly increase the rubber powder content in the asphalt-based roll material. While maintaining high joint peel strength and heat resistance limit temperature, the asphalt-based roll material has a significantly better low-temperature flexibility limit temperature than existing roll materials.

[0176] Example 9

[0177] A non-woven self-adhesive asphalt roll material, by weight, comprises 48.0 parts of base asphalt, 10 parts of base oil, 2.0 parts of SBS, 2.0 parts of SBR, 12 parts of rubber powder, 0.2 parts of desulfurizer, and 25.8 parts of filler powder.

[0178] The non-woven self-adhesive roll material is prepared by the following method:

[0179] After the first base asphalt (24 parts base asphalt) and the first base oil (8 parts base oil) are added to the batching tank, the mixture is stirred at 50 r / min after the feeding is completed to obtain the second mixture.

[0180] After heating the second mixture to 160°C, add 2 parts of SBS and 2 parts of SBR, and stir at 300 r / min to obtain the third mixture.

[0181] After heating the third mixture to 170°C, the colloid mill was turned on to grind the material in the reactor. After grinding for 1 hour, the grinding was stopped, and the mixture was stirred at high speed for 1 hour to obtain the first mixture.

[0182] The second base asphalt (24 parts base asphalt) and the second base oil (2 parts base oil) were mixed at 50 r / min to obtain the first premix.

[0183] After heating the first premix to 160°C, add 4.8 parts of rubber powder and 0.2 parts of desulfurizer, stir at 300 r / min, heat again to 160°C, and then grind to obtain the first mixture.

[0184] After the first mixture is heated to 170°C, 3.6 parts of rubber powder are added for grinding. After the temperature reaches 170°C again, the remaining 3.6 parts of rubber powder are added for grinding. Grinding is stopped after the temperature reaches 170°C, and the mixture is stirred at 300 r / min for 1 hour to obtain the second mixture.

[0185] The first and second mixtures were mixed and stirred at 300 r / min for 0.5 h. Then, 25.7 parts of filler powder were added and dispersed for 0.5 h to obtain the asphalt composition.

[0186] The asphalt composition was molded at 160℃~165℃. Spray cooling was used during molding instead of water immersion cooling in order to maintain a certain temperature and ensure the vulcanization effect. The molding speed was 30m / min to ensure the cooling effect, and the resulting non-woven self-adhesive asphalt roll was obtained. The specific properties are detailed in Table 2.

[0187] Examples 10-11

[0188] The difference between Examples 10-11 and Example 9 lies in the different amounts of rubber powder and filler powder used, and the different amounts of rubber powder added each time during the preparation process. See Table 2 for details.

[0189] Comparative Examples 9-10

[0190] The difference between Comparative Examples 9-10 and Example 9 lies in the different amounts of rubber powder and filler powder used, and the use of a single-stage feeding method. See Table 2 for details.

[0191] Table 2. Parameters and performance tests of Examples 9-11 and Comparative Examples 8-9

[0192]

[0193] As shown in Table 2, the asphalt composition prepared by the method of this application has a lower viscosity. The asphalt composition of this application can significantly increase the rubber powder content in the non-woven self-adhesive asphalt roll. With the increase of rubber powder content in the asphalt composition, the non-woven self-adhesive asphalt roll has better low-temperature performance and has heat resistance and peel strength that are no weaker than those of non-woven self-adhesive asphalt rolls prepared by existing methods.

[0194] Example 12

[0195] The difference between Example 12 and Example 9 lies in the amount of some raw materials used. See Table 3 for details.

[0196] Comparative Example 11

[0197] The difference between Comparative Example 11 and Comparative Example 9 lies in the amount of some raw materials used, as detailed in Table 3.

[0198] Table 3. Parameters and performance tests of Example 12 and Comparative Example 11

[0199]

[0200] As shown in Table 3, the non-woven self-adhesive asphalt roll obtained by controlling the number of times rubber powder is added using the preparation method of this application has a higher rubber powder content and a higher content of filler powder, which can further reduce the cost of non-woven self-adhesive asphalt roll.

[0201] Example 13

[0202] The difference between Example 13 and Example 5 is that the mesh size of the rubber component is different, as detailed in Table 4.

[0203] Table 4. Parameters and performance tests of rubber powder in Examples 5 and 13.

[0204]

[0205] As shown in Table 4, when the parameters of the rubber powder meet the scope of this application, the asphalt composition has a suitable viscosity, and the asphalt rolls prepared using the asphalt composition have good heat resistance limit temperature and low temperature flexibility limit temperature.

[0206] 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 method for preparing an asphalt composition, characterized in that, include: A first mixture is obtained by mixing a modifier, a first base oil, and a first base asphalt, wherein the mass ratio of the modifier, the first base asphalt, and the first base oil is 1:(5-7):(2-4). The second base asphalt and the second base oil are stirred and mixed, and then a desulfurizing agent and a first predetermined amount of rubber powder are added. The mixture is stirred, dispersed and ground to obtain a first mixture. The first predetermined amount is 40% to 60% of the total mass of the rubber powder, by mass percentage. The second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, the mixture is ground. After heating, the next addition of rubber powder is carried out. After the last addition of rubber powder, the mixture is ground, heated and stirred to obtain the second mixture. The total mass ratio of the rubber powder to the second base asphalt is 0.25:1 to 0.9:

1. The first mixture and the second mixture are mixed and stirred in a mass ratio of 1:2 to 1:6, and then filler powder is added and dispersed to obtain the asphalt composition.

2. The preparation method according to claim 1, characterized in that, The steps of mixing the second base asphalt and the second base oil, adding a desulfurizing agent and a predetermined amount of rubber powder, and then mixing, dispersing, and grinding to obtain the first mixture include: The second base asphalt and the second base oil are mixed at a speed of 20 r / min to 50 r / min to obtain the first premix. After heating the first premix to 155℃~165℃, the desulfurizing agent and a first predetermined amount of the rubber powder are added. The mixture is stirred at 250r / min~300r / min and heated to 165℃~175℃, and then ground to obtain the first mixture.

3. The preparation method according to claim 1, characterized in that, The steps of adding a second predetermined amount of rubber powder to the first mixture in multiple portions, grinding after each addition, heating before the next addition of rubber powder, and finally grinding and stirring after the last addition of rubber powder to obtain the second mixture include: The first mixture is heated to 170℃~175℃, and the second predetermined amount of rubber powder is added to the first mixture in multiple batches. After each addition of rubber powder, grinding is performed, and the temperature is raised to 170℃~175℃ for the next addition of rubber powder. After the last addition of rubber powder, grinding is performed, and the temperature is raised to 170℃~175℃ to stop grinding. The mixture is stirred at 250r / min~300r / min for 0.5h~1h to obtain the second mixture.

4. The preparation method according to claim 1, characterized in that, The mass ratio of the desulfurizing agent to the total mass of the rubber powder is 1:24 to 1:

300.

5. The preparation method according to claim 1, characterized in that, The preparation method satisfies at least one of the following: (1) The step of mixing the first mixture and the second mixture in a mass ratio of 1:2 to 1:6 and then adding filler powder to disperse the mixture to obtain the asphalt composition includes: The first mixture and the second mixture are mixed and stirred in a mass ratio of 1:2 to 1:6, and then the remaining asphalt and base oil in the formula are added, and then filler powder is added and dispersed to obtain the asphalt composition. (2) The step of mixing the modifier, the first base oil and the first base asphalt to obtain the first mixture includes: The first base asphalt and the first base oil are mixed at a first predetermined mixing speed to obtain a second mixture. Preferably, the first predetermined mixing speed is 20 r / min to 50 r / min. After the second mixture is heated to the first predetermined temperature, the modifier is added, and then the mixture is stirred and dispersed at the second predetermined stirring speed to obtain the third mixture. Preferably, the first predetermined temperature is 155℃~165℃, and the second predetermined stirring speed is 250r / min~300r / min. More preferably, the modifier includes at least one of SBS and SBR. After the third mixture is heated to the second predetermined temperature, the third mixture is ground for a first predetermined time. After the grinding is completed, it is stirred at a third predetermined stirring speed for a third predetermined time to obtain the first mixture. Preferably, the second predetermined temperature is 180℃~185℃, the first predetermined time is 1h~2h, the third predetermined stirring speed is 250r / min~300r / min, and the third predetermined time is 0.5h~1h. (3) The step of mixing the first mixture and the second mixture in a mass ratio of 1:2 to 1:6, then adding filler powder to disperse the mixture, to obtain the asphalt composition includes: The first mixture and the second mixture are mixed and stirred at a mass ratio of 1:2 to 1:6 at 250 r / min to 300 r / min for 0.5 h to 1 h, and then the filler powder is added and the mixture is stirred for another 0.5 h to 1 h to obtain the asphalt composition.

6. An asphalt composition, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 5.

7. The asphalt composition according to claim 6, characterized in that, The asphalt composition comprises the following raw material components in parts by weight: Base bitum, 33 to 48 parts; Base oil, 6.5 parts to 8 parts; Modifier, 2 to 5 parts; Rubber powder, 12 to 30 parts; Desulfurizing agent, 0.1 to 0.5 parts; Filler powder, 15 to 33 parts, preferably, the filler powder includes inorganic filler powder, more preferably, the inorganic filler powder includes at least one of heavy calcium carbonate and talc.

8. A method for preparing asphalt roll material, characterized in that, The asphalt roll is obtained by molding the asphalt composition prepared by any one of the preparation methods of claims 1 to 5 and / or the asphalt composition of any one of claims 6 to 7, wherein the asphalt roll includes at least one of a base-based asphalt roll and a non-reinforced self-adhesive asphalt roll.

9. The preparation method according to claim 8, characterized in that, The preparation method satisfies at least one of the following: (1) The asphalt roll is a base asphalt roll, and the preparation method includes: mixing the asphalt composition with a crosslinking agent and then molding it to obtain the base asphalt roll. Preferably, the mass ratio of the crosslinking agent to the total mass of the rubber powder is 1:24 to 1:

300. (2) The step of mixing the asphalt composition with the crosslinking agent and then molding it to obtain the base asphalt roll includes: adding the crosslinking agent to the asphalt composition 0.4h to 0.5h before preparing the base asphalt roll and mixing it at a stirring speed of 250r / min to 300r / min, and then molding it at 140℃ to 150℃ to obtain the base asphalt roll. Preferably, the cooling method of the molding process includes spray cooling, and the molding speed of the molding process is 20m / min to 40m / min.

10. An asphalt roll material, characterized in that, It is prepared by the preparation method according to any one of claims 8 to 9.

11. The bitumen roll material according to claim 10, characterized in that, The asphalt roll material comprises the following raw material components in parts by weight: Base bitum, 33 to 48 parts; Base oil, 6.5 parts to 8 parts; Modifier, 2 to 5 parts; Rubber powder, 12 to 30 parts; Desulfurizing agent, 0.1 to 0.5 parts; Crosslinking agent, 0.1 to 0.5 parts, preferably, the crosslinking agent is a vulcanizing agent; Filler powder, 15 to 33 parts, preferably, the filler powder includes inorganic filler powder, more preferably, the inorganic filler powder includes at least one of heavy calcium carbonate and talc.

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