Low-temperature high-viscosity modified asphalt and processing technology thereof

Abstract

The invention relates to the technical field of asphalt, in particular to low-temperature high-viscosity modified asphalt and a processing technology thereof. The low-temperature high-viscosity modified asphalt is prepared from the following raw materials in parts by weight: 100-120 parts of base asphalt, 8-10 parts of a first additive, 8-10 parts of a second additive and 5-7 parts of a third additive, the traditional Chinese medicine residues are prepared into the first additive, main component fibers and organic components can form a network structure, cohesion is enhanced, active groups react with asphalt to improve stability and relieve low-temperature embrittlement, the bagasse is prepared into the second additive, the main component fibers construct a three-dimensional skeleton, and the three-dimensional skeleton is formed. The lignin and the asphalt undergo a chemical reaction to improve the rheological property and reduce the brittleness at low temperature, and the lignin and the asphalt jointly act to improve the viscosity and crack resistance of the asphalt and solve the problems of slipping and cracking of an asphalt pavement in a low-temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt, in particular to a low-temperature high-viscosity modified asphalt and a processing technology thereof. Background Art

[0002] Asphalt pavement refers to various types of pavement paved with road asphalt materials mixed into mineral materials. Asphalt binder improves the ability of paving aggregate to resist damage to the road surface caused by traffic and natural factors, making the road surface smooth, dust-free, impermeable and durable. Therefore, asphalt pavement is the most widely used high-grade pavement in road construction.

[0003] Traditional asphalt is composed of a variety of hydrocarbons. At low temperatures, the thermal motion of molecules slows down, asphaltene forms a rigid network, and the solvation effect of saturated and aromatic components weakens, causing it to become hard and brittle, and its viscosity decreases. At the same time, low-temperature shrinkage produces internal stress, which can easily cause cracking, and the adhesion with the base material decreases. Water intrusion destroys the structure, and there is no effective modifying component, so it is easy to crack and slip at low temperatures. Based on this, the present invention provides a low-temperature high-viscosity modified asphalt and a processing technology thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a low-temperature high-viscosity modified asphalt and a processing technology thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature high-viscosity modified asphalt, composed of the following raw materials in parts by weight: 100-120 parts of base asphalt, 8-10 parts of a first additive, 8-10 parts of a second additive and 5-7 parts of a third additive.

[0006] Preferably, the base asphalt processing method includes the following steps: heating the base asphalt to 150-170°C, the base asphalt becomes a fluid state, using a stirring device to set the speed to 400-500r / min and continuously stirring, adding an antioxidant at (1-2)% by weight of the base asphalt, increasing the stirring speed to 600-800r / min, and continuously stirring for 10-15min, adding an anti-stripping agent at (0.3-0.8)% by weight of the base asphalt, and continuously stirring for 15-20min, adding a plasticizer at (2-5)% by weight of the base asphalt, and continuously stirring for 20-30min, adding an ultraviolet absorber at (0.5-1)% by weight of the base asphalt, and continuously stirring for 20-30min, to obtain an asphalt base material, and keeping it warm for later use.

[0007] Through the above technical scheme: the addition of antioxidants can capture the free radicals generated during the aging process of asphalt, slow down the aging process, and increase the service life; the addition of anti-stripping agents can enhance the adhesion between asphalt and the subsequent first additive, second additive, and third additive, avoid water damage to the bonding interface between asphalt and other materials, and improve the overall structural stability; the addition of plasticizers can increase the flexibility of asphalt, making it more plastic at low temperatures and avoiding low-temperature brittle cracking, while improving the processing performance of asphalt, making it easier to operate and shape; the addition of ultraviolet absorbers can absorb ultraviolet rays in sunlight to avoid ultraviolet rays accelerating the aging and performance degradation of asphalt.

[0008] The antioxidant can be selected from any one of hindered amine light stabilizer, butylated hydroxytoluene and propyl gallate, the anti-stripping agent can be selected from any one of fatty amine, slaked lime and aminosilane, the plasticizer can be selected from any one of dioctyl phthalate, epoxy soybean oil and tributyl citrate, and the ultraviolet absorber can be selected from any one of benzophenone, benzotriazole and phenyl salicylate.

[0009] The preparation method of the first additive comprises the following steps: selecting discarded Chinese medicine residue as raw material, adding a cleaning agent, setting a water flow rate of 50 L / min, continuously cleaning for 30-40 min, then placing in a dryer, setting a temperature of 100-105° C., drying for 4-5 h, then placing in a grinder, setting a speed of 3000-3500 r / min, continuously crushing for 20-30 min, sieving to obtain a first residue material with a particle size of 0.5-2 mm, then placing in an extraction tank, adding anhydrous ethanol, heating to 70-80° C., setting a speed of 150-200 r / min for continuous extraction for 3-4 h, obtaining an extract and placing in a concentrator, concentrating to (25-30)% of the original volume of the extract under the conditions of setting a temperature of 60-70° C. and a vacuum pressure of 70-80 kPa, to obtain a Chinese medicine residue preparation, i.e., the first additive, for standby use.

[0010] According to the above technical scheme: the Chinese medicine residue preparation is rich in fiber components such as cellulose and hemicellulose. Cellulose is composed of glucose units connected by β-1,4-glycosidic bonds, and hemicellulose is composed of various monosaccharides. They form a three-dimensional network structure in the asphalt system, and their long chains are interspersed between asphalt molecules. Polar groups such as hydroxyl groups on the surface are adsorbed with polar components of asphalt through hydrogen bonds, van der Waals forces, etc., increasing internal friction and cohesion, and limiting the movement of asphalt molecules at low temperatures. At the same time, the Chinese medicine residue preparation contains organic components such as polysaccharides, flavonoids, phenols, terpenes, saponins, etc. Polysaccharides fill the gaps in asphalt molecules, and the phenolic hydroxyl groups of flavonoids and phenols react with unsaturated components of asphalt through addition, oxidation-reduction and other reactions to terminate free radical chain reactions, form new chemical bonds, and enhance intermolecular forces. Terpenes volatilize to form pores and buffer volume shrinkage. The saponin surfactant components can reduce the surface tension between asphalt and water, improve the adhesion between asphalt and aggregate, and maintain the integrity of the road surface at low temperatures. These physical and chemical effects jointly improve the performance of low-temperature high-viscosity asphalt.

[0011] The mass ratio of the first slag material to anhydrous ethanol is 1:(3-4).

[0012] The preparation method of the second additive comprises the following steps: collecting waste bagasse as raw material, adding it into a cleaning machine, setting the water flow rate to 40L / min and continuously washing it for 25-50min, then putting it into a dryer, setting the temperature to 110-120°C, drying time to 3-4h, then putting it into a crusher, setting the speed to 2800-3000r / min, crushing for 20-25min, sieving to obtain a second residue material with a particle size of 0.5-5mm, putting it into a reactor, adding 8% sodium hydroxide solution, heating to 60-80°C, rotating speed to 180-200r / min, continuously stirring the reaction for 2-3h, then washing it with deionized water to pH7, then putting it into a dryer, drying it at 100-120°C for 3-5h, and obtaining a bagasse preparation, i.e., the second additive, for standby use.

[0013] Through the above technical scheme: the cellulose in the bagasse preparation is a long-chain macromolecule composed of numerous glucose units connected in order through β-1,4-glycosidic bonds, and has high crystallinity and rigidity; hemicellulose is a branched polysaccharide formed by the polymerization of various monosaccharides such as xylose and mannose, with a low relative molecular mass and a certain flexibility. When the bagasse preparation is incorporated into asphalt, these fibrous substances, with their long-chain form, intertwine and entangle with each other, and build a stable three-dimensional network skeleton in the asphalt system. This three-dimensional network skeleton greatly enhances the cohesive strength of the asphalt and effectively prevents the relative sliding of the asphalt molecules when subjected to external forces. At the same time, the lignin in the bagasse preparation, as a high molecular polymer with a special aromatic structure, has high chemical activity of phenolic hydroxyl, methoxy and other functional groups in its molecules. In the subsequent asphalt heating process, some low molecular organic components in the bagasse preparation will gradually dissolve and diffuse in the asphalt system, filling the gaps between asphalt molecules, optimizing the molecular arrangement of asphalt, and improving the rheological properties of asphalt, reducing the hindrance to molecular movement at low temperatures and making it less prone to brittle cracking. At high temperatures, the cohesion between molecules can be maintained and it is not easy to flow, thereby comprehensively improving the comprehensive performance of asphalt.

[0014] The mass ratio of the second slag material to the sodium hydroxide solution is 1:(5-7).

[0015] The preparation method of the third additive comprises the following steps: collecting discarded ceramic products as raw materials, crushing and grinding them into ceramic powder with a particle size of 10-100 μm, adding them into an impregnation tank, adding a silane coupling agent, impregnating for 60-80 minutes, and then placing them into a drying box, drying them at 120° C. for 2-3 hours to obtain the third additive for standby use.

[0016] According to the above technical scheme: during the impregnation of ceramic powder, silane coupling agent molecules will gradually adsorb on the surface of ceramic particles. During the drying operation, as the temperature rises, water gradually evaporates, and the ethoxy groups in the silane coupling agent molecules will undergo a hydrolysis reaction to generate silanol groups and undergo a condensation reaction with the hydroxyl groups on the surface of the ceramic particles. The silane coupling agent is firmly grafted to the surface of the ceramic particles through covalent bonds to form a layer of chemically bonded silane coupling agent film. In this film, the amino groups of the silane coupling agent molecules face outward, and the amino groups have a certain hydrophobicity. The prepared hydrophobic layer can change the surface properties of materials such as ceramic particles, enhance their compatibility with asphalt, and be evenly dispersed in the asphalt and more easily float to the surface to improve the roughness and skid resistance of the road surface. At the same time, it effectively blocks the intrusion of water, avoids water damage to the interface between asphalt and particles and the performance of the material itself, and improves the water damage resistance and durability of the asphalt pavement, thereby comprehensively improving the asphalt effect.

[0017] The silane coupling agent is prepared by mixing anhydrous ethanol and gamma-aminopropyltriethoxysilane in a mass ratio of 3:97, and the mass ratio of the ceramic powder to the silane coupling agent is 1:(8-10).

[0018] The processing technology of the low-temperature high-viscosity modified asphalt comprises the following steps: S1: Weigh the first additive, the second additive and the third additive as needed and add them to the asphalt base material, set the stirring speed to 1200-1500r / min, and continue stirring for 50-60min; S2: Use a high-speed shear emulsifier to shear the raw materials in S1 for 25-30 minutes at a shear rate of 3500-4000 r / min for 40-50 minutes to obtain modified asphalt; S3: Place the modified asphalt in S2 in a vacuum degassing device and degas for 30-40 minutes at a vacuum degree of 90 kPa to obtain low-temperature and high-viscosity modified asphalt after removing bubbles.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, Chinese medicine residue is prepared as the first additive, wherein the main components of fiber and organic components can form a network structure to enhance cohesion, and its active groups react with asphalt to improve stability and alleviate low-temperature brittle cracking. Sugarcane bagasse is prepared as the second additive, wherein the main component of fiber constructs a three-dimensional skeleton, and lignin reacts chemically with asphalt to improve rheological properties and reduce brittleness at low temperatures. The two work together to improve the viscosity and crack resistance of asphalt, thereby solving the problems of slippage and cracking of asphalt pavements under low-temperature environments.

[0020] 2. In the present invention, waste ceramics are prepared as the third additive. During the preparation process, a hydrophobic layer is formed on its surface, which enhances its compatibility with asphalt, allowing it to be evenly dispersed in the asphalt to avoid agglomeration. The ceramic powder with high hardness acts as a skeleton to disperse stress, prevent the expansion of cracks inside the asphalt, and improve the mechanical properties. In addition, the high wear resistance of the ceramic powder can effectively resist road wear. The particles protruding from the asphalt surface increase the micro-roughness of the road surface and significantly improve the skid resistance. Its good thermal stability limits the thermal deformation of asphalt, buffers low-temperature stress, and improves the high and low temperature performance of asphalt. At the same time, the ceramic powder with strong chemical stability can block the erosion of external chemicals, slow down the aging of asphalt, extend the service life of the road surface, optimize the rheological properties of asphalt, and enhance its performance at different temperatures.

[0021] 3. In the present invention, the first additive, the second additive and the third additive are prepared from Chinese medicinal residues, bagasse and waste ceramic products respectively, which have significant advantages over traditional modified asphalt. Firstly, they turn waste into treasure, reduce the cost of raw materials, and reduce the pressure of waste on the environment. Secondly, Chinese medicinal residues and bagasse preparations can improve the low-temperature performance and viscosity of asphalt, enhance crack resistance, and reduce slipping. Furthermore, waste ceramics can be processed to improve the wear resistance, skid resistance and chemical stability of asphalt, which not only realizes resource recycling, but also improves asphalt performance, takes into account environmental protection and practicality, and has good economic and environmental benefits. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application is described clearly and completely. Example 1

[0024] The present embodiment provides a low-temperature and high-viscosity modified asphalt, which is composed of the following raw materials in parts by weight: 100 parts of base asphalt, 8 parts of a first additive, 8 parts of a second additive, and 5 parts of a third additive.

[0025] Among them, the base asphalt processing method includes the following steps: heating the base asphalt to 150°C, the base asphalt becomes a fluid state, using a stirring equipment to set the speed to 400r / min for continuous stirring, adding an antioxidant at 1% of the weight of the base asphalt, increasing the stirring speed to 600r / min, and continuing to stir for 10 minutes, adding an anti-stripping agent at 0.3% of the weight of the base asphalt, and continuing to stir for 15 minutes, adding a plasticizer at 2% of the weight of the base asphalt, and continuing to stir for 20 minutes, adding an ultraviolet absorber at 0.5% of the weight of the base asphalt, and continuing to stir for 20 minutes, to obtain an asphalt base material, and keeping it warm for standby use.

[0026] Among them, the antioxidant is a hindered amine light stabilizer, the anti-stripping agent is a fatty amine, the plasticizer is dioctyl phthalate, and the ultraviolet absorber is benzophenone.

[0027] Among them, the preparation method of the first additive includes the following steps: selecting discarded Chinese medicine residue as raw material, adding a cleaning agent, setting the water flow rate to 50L / min, and continuously cleaning for 30 minutes, then putting it into a dryer, setting the temperature to 100°C, drying for 4 hours, then adding it to a grinder, setting the speed to 3000r / min, and continuously crushing for 20 minutes, sieving, and obtaining a first residue material with a particle size of 0.5mm, then putting it into an extraction tank, adding anhydrous ethanol, heating to 70°C, setting the speed to 150r / min and continuously extracting for 3 hours, obtaining an extract and placing it in a concentrator, setting the temperature to 60°C and the vacuum pressure to 70kPa, concentrating it to 25% of the original volume of the extract, and obtaining a Chinese medicine residue preparation, which is the first additive, for standby use.

[0028] Among them, the mass ratio of the first slag material to anhydrous ethanol is 1:3.

[0029] Among them, the preparation method of the second additive includes the following steps: collecting waste bagasse as raw material, adding it to a cleaning machine, setting the water flow rate to 40L / min and continuously washing it for 25min, then putting it into a dryer, setting the temperature to 110°C, drying time for 3h, then putting it into a crusher, setting the speed to 2800r / min, crushing for 20min, sieving to obtain a second residue with a particle size of 0.5mm, putting it into a reactor, adding 8% concentration of sodium hydroxide solution, heating to 60°C, rotating speed 180r / min, continuously stirring the reaction for more than 2h, then rinsing it with deionized water to pH7, and then putting it into a dryer, drying it at 100°C for 3h to obtain a bagasse preparation, which is the second additive, for standby use.

[0030] Among them, the mass ratio of the second slag material to the sodium hydroxide solution is 1:5.

[0031] Among them, waste ceramic products are collected as raw materials, crushed and ground into ceramic powder with a particle size of 10μm, added into an impregnation tank, silane coupling agent is added, impregnated for 60min, and then placed into a drying box and dried at 120°C for 2h to obtain the third additive for standby use.

[0032] The silane coupling agent is prepared by mixing anhydrous ethanol and γ-aminopropyltriethoxysilane in a mass ratio of 3:97, and the mass ratio of ceramic powder to silane coupling agent is 1:8.

[0033] Furthermore, the processing technology of low temperature high viscosity modified asphalt is prepared by the following process: S1: Weigh the first additive, the second additive and the third additive as needed and add them to the asphalt base material, set the stirring speed to 1200r / min, and continue stirring for 50min; S2: Use a high-speed shear emulsifier to shear the raw materials in S1 for 25 minutes at a shear rate of 3500 r / min for 40 minutes to obtain modified asphalt; S3: The modified asphalt in S2 is placed in a vacuum degassing device and degassed at a vacuum degree of 90 kPa for 30 minutes to obtain low-temperature and high-viscosity modified asphalt after removing bubbles. Example 2

[0034] The low-temperature high-viscosity modified asphalt and its processing technology in this embodiment are basically the same as those in Example 1, except that: A low-temperature high-viscosity modified asphalt is composed of the following raw materials in parts by weight: 110 parts of base asphalt, 9 parts of a first additive, 9 parts of a second additive and 6 parts of a third additive.

[0035] Among them, the base asphalt processing method includes the following steps: heating the base asphalt to 160°C, the base asphalt becomes a fluid state, using a stirring equipment to set the speed to 450r / min for continuous stirring, adding an antioxidant at 1.5% of the weight of the base asphalt, increasing the stirring speed to 700r / min, and continuously stirring for 13 minutes, adding an anti-stripping agent at 0.5% of the weight of the base asphalt, and continuously stirring for 18 minutes, adding a plasticizer at 3% of the weight of the base asphalt, and continuously stirring for 25 minutes, adding an ultraviolet absorber at 0.8% of the weight of the base asphalt, and continuously stirring for 25 minutes, to obtain an asphalt base material, and keeping it warm for standby use.

[0036] Among them, the antioxidant is butylated hydroxytoluene, the anti-stripping agent is slaked lime, the plasticizer is epoxidized soybean oil, and the ultraviolet absorber is benzotriazole.

[0037] Among them, the preparation method of the first additive includes the following steps: selecting discarded Chinese medicine residue as raw material, adding a cleaning agent, setting the water flow rate to 50L / min, and continuously cleaning for 35 minutes, then putting it into a dryer, setting the temperature to 103°C, drying for 4.5 hours, and then adding it to a grinder, setting the speed to 3300r / min, and continuously crushing for 25 minutes. Screening to obtain a first residue material with a particle size of 1mm, then putting it into an extraction tank, adding anhydrous ethanol, heating to 75°C, setting the speed to 170r / min and continuously extracting for 3.5 hours, obtaining an extract and placing it in a concentrator, setting the temperature to 65°C and the vacuum pressure to 75kPa, concentrating it to 28% of the original volume of the extract, and obtaining a Chinese medicine residue preparation, which is the first additive, for standby use.

[0038] Among them, the mass ratio of the first slag material to anhydrous ethanol is 1:3.5.

[0039] Among them, the preparation method of the second additive includes the following steps: collecting waste bagasse as raw material, adding it to a cleaning machine, setting the water flow rate to 40L / min and continuously washing it for 40min, then putting it into a dryer, setting the temperature to 115°C, drying time 3.5h, then putting it into a crusher, setting the speed to 2900r / min, crushing for 23min, sieving to obtain a second residue with a particle size of 3mm, putting it into a reactor, adding 8% concentration of sodium hydroxide solution, heating to 70°C, rotating speed 190r / min, continuously stirring the reaction for more than 2.5h, then rinsing it with deionized water to pH7, and then putting it into a dryer, drying it at 110°C for 4h to obtain a bagasse preparation, which is the second additive, for standby use.

[0040] Among them, the mass ratio of the second slag material to the sodium hydroxide solution is 1:6.

[0041] Among them, waste ceramic products are collected as raw materials, crushed and ground into ceramic powder with a particle size of 60μm, added into an impregnation tank, silane coupling agent is added, impregnated for 70 minutes, and then placed into a drying box and dried at 120°C for 2.5 hours to obtain the third additive for standby use.

[0042] The silane coupling agent is prepared by mixing anhydrous ethanol and γ-aminopropyltriethoxysilane in a mass ratio of 3:97, and the mass ratio of ceramic powder to silane coupling agent is 1:9.

[0043] Furthermore, the processing technology of low temperature high viscosity modified asphalt is prepared by the following process: S1: Weigh the first additive, the second additive and the third additive as needed and add them to the asphalt base material, set the stirring speed to 1300r / min, and continue stirring for 55min; S2: Use a high-speed shear emulsifier to shear the raw materials in S1 for 28 minutes at a shear rate of 3800 r / min for 45 minutes to obtain modified asphalt; S3: The modified asphalt in S2 is placed in a vacuum degassing device and degassed at a vacuum degree of 90 kPa for 35 minutes to obtain low-temperature and high-viscosity modified asphalt after removing bubbles. Example 3

[0044] The low-temperature high-viscosity modified asphalt and its processing technology in this embodiment are basically the same as those in Example 1, except that: A low-temperature high-viscosity modified asphalt is composed of the following raw materials in parts by weight: 120 parts of base asphalt, 10 parts of a first additive, 10 parts of a second additive and 7 parts of a third additive.

[0045] Among them, the base asphalt processing method includes the following steps: heating the base asphalt to 170°C, the base asphalt becomes a fluid state, using a stirring equipment to set the speed to 500r / min for continuous stirring, adding an antioxidant at 2% of the weight of the base asphalt, increasing the stirring speed to 800r / min, and continuing to stir for 15 minutes, adding an anti-stripping agent at 0.8% of the weight of the base asphalt, and continuing to stir for 20 minutes, adding a plasticizer at 5% of the weight of the base asphalt, and continuing to stir for 30 minutes, adding an ultraviolet absorber at 1% of the weight of the base asphalt, and continuing to stir for 30 minutes, to obtain an asphalt base material, and keeping it warm for standby use.

[0046] Among them, the antioxidant is propyl gallate, the anti-stripping agent is aminosilane, the plasticizer is tributyl citrate, and the ultraviolet absorber is phenyl salicylate.

[0047] Among them, the preparation method of the first additive includes the following steps: selecting discarded Chinese medicine residue as raw material, adding a cleaning agent, setting the water flow rate to 50L / min, continuously cleaning for 40 minutes, then putting it into a dryer, setting the temperature to 105°C, drying for 5 hours, then adding it to a grinder, setting the speed to 3500r / min, continuously crushing for 30 minutes, sieving, and obtaining a first residue material with a particle size of 2mm, then putting it into an extraction tank, adding anhydrous ethanol, heating to 80°C, setting the speed to 200r / min and continuously extracting for 4 hours, obtaining an extract and placing it in a concentrator, setting the temperature to 70°C and the vacuum pressure to 80kPa, concentrating it to 30% of the original volume of the extract, and obtaining a Chinese medicine residue preparation, which is the first additive, for standby use.

[0048] Among them, the mass ratio of the first slag material to anhydrous ethanol is 1:4.

[0049] Among them, the preparation method of the second additive includes the following steps: collecting waste bagasse as raw material, adding it to a cleaning machine, setting the water flow rate to 40L / min and continuously washing it for 50 minutes, then putting it into a dryer, setting the temperature to 120°C, drying time 4h, then putting it into a crusher, setting the speed to 3000r / min, crushing for 25min, sieving to obtain a second residue with a particle size of 5mm, putting it into a reactor, adding 8% concentration of sodium hydroxide solution, heating to 80°C, rotating speed 200r / min, continuously stirring the reaction for more than 3h, then washing with deionized water to pH7, and then putting it into a dryer, drying it at 120°C for 5h to obtain a bagasse preparation, which is the second additive, for standby use.

[0050] Among them, the mass ratio of the second slag material to the sodium hydroxide solution is 1:7.

[0051] Among them, waste ceramic products are collected as raw materials, crushed and ground into ceramic powder with a particle size of 100μm, added into an impregnation tank, silane coupling agent is added, impregnated for 80min, and then placed into a drying box and dried at 120℃ for 3h to obtain the third additive for standby use.

[0052] The silane coupling agent is prepared by mixing anhydrous ethanol and γ-aminopropyltriethoxysilane in a mass ratio of 3:97, and the mass ratio of ceramic powder to silane coupling agent is 1:10.

[0053] Furthermore, the processing technology of low temperature high viscosity modified asphalt is prepared by the following process: S1: Weigh the first additive, the second additive and the third additive as needed and add them to the asphalt base material, set the stirring speed to 1500r / min, and continue stirring for 60min; S2: Use a high-speed shear emulsifier to shear the raw materials in S1 for 30 minutes at a shear rate of 4000 r / min for 50 minutes to obtain modified asphalt; S3: The modified asphalt in S2 is placed in a vacuum degassing device and degassed at a vacuum degree of 90 kPa for 40 minutes to obtain low-temperature and high-viscosity modified asphalt after removing bubbles.

[0054] Comparative Example 1: The difference between this comparative example and Example 1 is that: In this comparative example, no antioxidant, anti-stripping agent, plasticizer or UV absorber was added to the base asphalt.

[0055] Comparative Example 2: The difference between this comparative example and Example 1 is that: In this comparative example, the first additive was not added.

[0056] Comparative Example 3: The difference between this comparative example and Example 1 is that: In this comparative example, no second additive was added.

[0057] Comparative Example 4: The difference between this comparative example and Example 1 is that: In this comparative example, no third additive was added.

[0058] In order to more clearly illustrate the preparation process provided by the present invention, the above examples are described in detail. The test methods of various indicators of the diamond paint coatings prepared in the examples and comparative examples are as follows: The low-temperature high-viscosity modified asphalt prepared in Examples 1-3 and Comparative Examples 1-4 were respectively taken, and the relevant performance indicators of the modified asphalt were tested according to the test methods specified in the "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTGE20-2011). The test results are shown in the following table. The obtained test data are recorded in the following table:

[0059] It can be seen from the above table that Examples 1-3 are low-temperature and high-viscosity modified asphalts prepared using the technical solution of the present application, while the modified asphalt prepared in Comparative Example 1 lacks antioxidants, anti-stripping agents, plasticizers and ultraviolet absorbers, and its performance is slightly lower than that of the low-temperature and high-viscosity modified asphalt prepared by the technical solution of the present application, while the modified asphalts prepared in Comparative Examples 2-4 lack the first additive, the second additive and the third additive, respectively, and their performance is far lower than that of the low-temperature and high-viscosity modified asphalt prepared by the technical solution of the present application.

[0060] In summary, the present invention discloses a low-temperature and high-viscosity modified asphalt and a processing technology thereof, wherein the base asphalt is modified by an antioxidant, an anti-stripping agent, a plasticizer and an ultraviolet absorber, a first additive, a second additive and a third additive, and has excellent high temperature resistance, low temperature crack resistance and aging resistance, and has high practicality.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature high-viscosity modified asphalt, characterized in that: The invention is composed of the following raw materials in parts by weight: 100-120 parts of base asphalt, 8-10 parts of a first additive, 8-10 parts of a second additive and 5-7 parts of a third additive.

2. The low-temperature high-viscosity modified asphalt according to claim 1, characterized in that: The base asphalt treatment method comprises the following steps: heating the base asphalt to 150-170° C., so that the base asphalt becomes fluidized, using a stirring device to set the rotation speed to 400-500 r / min for continuous stirring, adding an antioxidant in an amount of (1-2)% by weight of the base asphalt, increasing the stirring speed to 600-800 r / min, and continuously stirring for 10-15 minutes, adding an anti-stripping agent in an amount of (0.3-0.8)% by weight of the base asphalt, and continuously stirring for 15-20 minutes, adding a plasticizer in an amount of (2-5)% by weight of the base asphalt, and continuously stirring for 20-30 minutes, adding an ultraviolet absorber in an amount of (0.5-1)% by weight of the base asphalt, and continuously stirring for 20-30 minutes, to obtain an asphalt base material, and keeping it warm for later use.

3. The low-temperature high-viscosity modified asphalt according to claim 1, characterized in that: The antioxidant can be selected from any one of hindered amine light stabilizer, butylated hydroxytoluene and propyl gallate, the anti-stripping agent can be selected from any one of fatty amine, slaked lime and aminosilane, the plasticizer can be selected from any one of dioctyl phthalate, epoxy soybean oil and tributyl citrate, and the ultraviolet absorber can be selected from any one of benzophenone, benzotriazole and phenyl salicylate.

4. The low-temperature high-viscosity modified asphalt according to claim 1, characterized in that: The preparation method of the first additive comprises the following steps: selecting discarded Chinese medicine residue as raw material, adding a cleaning agent, setting a water flow rate of 50 L / min, continuously cleaning for 30-40 min, then placing in a dryer, setting a temperature of 100-105° C., drying for 4-5 h, then placing in a grinder, setting a speed of 3000-3500 r / min, continuously crushing for 20-30 min, sieving to obtain a first residue material with a particle size of 0.5-2 mm, then placing in an extraction tank, adding anhydrous ethanol, heating to 70-80° C., setting a speed of 150-200 r / min for continuous extraction for 3-4 h, obtaining an extract and placing in a concentrator, concentrating to (25-30)% of the original volume of the extract under the conditions of setting a temperature of 60-70° C. and a vacuum pressure of 70-80 kPa, to obtain a Chinese medicine residue preparation, i.e., the first additive, for standby use.

5. The low-temperature high-viscosity modified asphalt according to claim 4, characterized in that: The mass ratio of the first slag material to anhydrous ethanol is 1:(3-4).

6. The low-temperature high-viscosity modified asphalt according to claim 4, characterized in that: The preparation method of the second additive comprises the following steps: collecting waste bagasse as raw material, adding it into a cleaning machine, setting the water flow rate to 40L / min and continuously washing it for 25-50min, then putting it into a dryer, setting the temperature to 110-120°C, drying time to 3-4h, then putting it into a crusher, setting the speed to 2800-3000r / min, crushing for 20-25min, sieving to obtain a second residue material with a particle size of 0.5-5mm, putting it into a reactor, adding 8% sodium hydroxide solution, heating to 60-80°C, rotating speed to 180-200r / min, continuously stirring the reaction for 2-3h, then washing it with deionized water to pH7, then putting it into a dryer, drying it at 100-120°C for 3-5h, and obtaining a bagasse preparation, i.e., the second additive, for standby use.

7. The low-temperature high-viscosity modified asphalt according to claim 6, characterized in that: The mass ratio of the second slag material to the sodium hydroxide solution is 1:(5-7).

8. The low-temperature high-viscosity modified asphalt according to claim 6, characterized in that: Collect discarded ceramic products as raw materials, crush and grind them into ceramic powder with a particle size of 10-100μm, add them into the impregnation tank, add silane coupling agent, impregnate for 60-80min, then put them into the drying box, dry them at 120℃ for 2-3h, and prepare the third additive for standby use.

9. The low-temperature high-viscosity modified asphalt according to claim 6, characterized in that: The silane coupling agent is prepared by mixing anhydrous ethanol and gamma-aminopropyltriethoxysilane in a mass ratio of 3:97, and the mass ratio of the ceramic powder to the silane coupling agent is 1:(8-10).

10. The processing technology of low temperature high viscosity modified asphalt according to any one of claims 1 to 9, characterized in that: Prepared by the following process: S1: Weigh the first additive, the second additive and the third additive as needed and add them to the asphalt base material, set the stirring speed to 1200-1500r / min, and continue stirring for 50-60min; S2: Use a high-speed shear emulsifier to shear the raw materials in S1 for 25-30 minutes at a shear rate of 3500-4000 r / min for 40-50 minutes to obtain modified asphalt; S3: Place the modified asphalt in S2 in a vacuum degassing device and degas for 30-40 minutes at a vacuum degree of 90 kPa to obtain low-temperature and high-viscosity modified asphalt after removing bubbles.

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