Anti-ultraviolet aging environment-friendly asphalt regenerant suitable for plateau environment and preparation method of anti-ultraviolet aging environment-friendly asphalt regenerant

Abstract

The invention relates to the field of road building materials, and discloses an anti-ultraviolet aging environment-friendly asphalt regenerant suitable for a plateau environment and a preparation method of the anti-ultraviolet aging environment-friendly asphalt regenerant. Comprising the following components in parts by weight: 60-70 parts of plant-based light oil, 5-10 parts of an anti-ultraviolet aging agent, 5-10 parts of an epoxy plasticizer, 5-10 parts of an elastic restorer, 5-10 parts of a reducing agent, 5-10 parts of an inorganic rare earth ion complexing agent, 1-5 parts of a penetrant, 1-5 parts of a non-amine anti-stripping agent and 1-5 parts of a stabilizer. The asphalt regenerant provided by the invention not only can effectively recover the performance of aged asphalt, but also shows excellent ultraviolet aging resistance especially for a strong ultraviolet radiation environment in a plateau high-altitude area, so that the service life of an asphalt pavement is prolonged.

Description

Technical Field

[0001] The invention relates to the field of road construction materials, and in particular to an environmentally friendly asphalt regeneration agent with significant anti-ultraviolet aging function suitable for plateau high-altitude environments and a preparation method thereof. Background Art

[0002] With the continuous expansion of the global transportation network, the construction of roads in plateaus and high altitude areas is increasing. However, the unique natural environment in these areas, such as strong ultraviolet radiation, extreme temperature differences, and high environmental protection requirements, poses severe challenges to road construction materials. Traditional asphalt materials are very prone to aging under these conditions, resulting in a decline in pavement performance, cracks, peeling, and other phenomena, which seriously affect the service life of the road and driving safety. The recycling of waste asphalt mixtures can not only save a large amount of non-renewable resources such as new stones and new asphalt, but also reduce the ecological damage caused by the mining of a large amount of stones, play a role in protecting the environment, and is a sustainable development of asphalt pavement repair technology. The road performance of waste asphalt mixtures has declined due to asphalt aging and cannot meet the use requirements. Therefore, asphalt regeneration agents improve the physical properties of aged asphalt by restoring the chemical components and colloidal structure of aged asphalt, which has an important influence on improving the road performance of recycled asphalt mixtures.

[0003] However, most of the existing asphalt regeneration agents are designed for general environments and are not well adapted to the special environment of plateaus and high altitudes, especially lacking effective anti-ultraviolet aging capabilities. Therefore, developing an asphalt regeneration agent that can effectively restore the performance of waste asphalt recycling materials and maintain long-term stability in plateaus and high altitude environments has become a technical problem that needs to be solved urgently in the current road construction materials field. Summary of the invention

[0004] The present invention aims to provide an environmentally friendly vegetable oil-based asphalt regeneration agent suitable for plateau and high altitude environments and having significant anti-ultraviolet aging function, as well as a preparation method of the regeneration agent. The regeneration agent is based on renewable and biodegradable vegetable oil, and through an improved chemical modification process, not only its anti-ultraviolet aging performance is significantly improved, but also good environmental compatibility is maintained, effectively solving the key technical problems of the recycling of waste asphalt mixtures in special environments.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, an anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to high-altitude environments is provided. The components of the raw materials are counted by weight parts and include: 60-70 parts of plant-based light oil, 5-10 parts of anti-ultraviolet aging agent, 5-10 parts of epoxy plasticizer, 5-10 parts of elastic recovery agent, 5-10 parts of reducing agent, 5-10 parts of inorganic rare earth ion complexing agent, 1-5 parts of penetrant, 1-5 parts of non-amine anti-stripping agent, and 1-5 parts of stabilizer.

[0007] According to some preferred embodiments, the plant-based light oil includes at least one of linseed oil, soybean oil, and rapeseed oil. Using this plant-based light oil can achieve the advantages of environmental protection, low carbon, and renewable.

[0008] According to some preferred embodiments, the epoxy plasticizer includes at least one of epoxy soybean oil, epoxy linseed oil, epoxy butyl stearate, epoxy fatty acid methyl ester, and epoxy styrene. Using this type of epoxy plasticizer has low toxicity and excellent heat and light stability.

[0009] According to some preferred embodiments, the elastic recovery agent includes at least one of polypropylene and polyurethane; the particle size of the elastic recovery agent < 10 μm. By adding the elastic recovery agent to the asphalt rejuvenator, the elasticity, flexibility, and temperature change resistance of the asphalt can be improved, enabling the repaired road surface to better resist temperature changes and vehicle loads. The reason for the poor effect of the existing dry-process SBS modified asphalt is that the particle size of the dry SBS particles is usually large, which is easy to agglomerate in the asphalt and difficult to disperse evenly, resulting in unstable modification effects; and SBS is easily degraded at high temperatures and its elastic recovery ability decreases at low temperatures, making it difficult to adapt to extreme temperature changes; SBS needs to form a continuous network structure through shearing. If the process is not perfect, the incomplete structure will reduce the rutting resistance and fatigue resistance. Based on this, we use a small-particle-size (< 10 μm) elastic recovery agent (such as polyurethane), which has better molecular chain flexibility, and the small particle size is conducive to uniform dispersion, can quickly form a dense elastic network, and enhance the temperature adaptability and load deformation resistance of the asphalt.

[0010] According to some preferred embodiments, the reducing agent is regenerated diatomaceous earth, and the particle size of the reducing agent < 5 μm. The preparation method of the regenerated diatomaceous earth is to calcine the waste diatomaceous earth at 600-800 °C for 8 h, and then treat it with the silane coupling agent KH550 using conventional treatment methods. The porosity of the regenerated diatomaceous earth is increased by 20-30% compared with ordinary diatomaceous earth, the specific surface area is larger (> 50 m

[0011] / g), and there are more surface active sites, which can efficiently adsorb the polar components generated by asphalt aging.

[0012] The regenerated diatomaceous earth used can effectively adsorb and remove the aging components in asphalt, while providing a new active surface, promoting the regeneration and repair of asphalt pavements, enhancing the coagulation function in the original asphalt, and enabling the regenerated asphalt to achieve better pavement maintenance quality.

[0013] According to some preferred embodiments, the inorganic rare earth complexing agent includes at least one of cerium oxide, lanthanum oxide, yttrium oxide, ytterbium oxide, and europium oxide.

[0014] According to some preferred embodiments, the penetrant includes kerosene or rubber oil. Kerosene or rubber oil can significantly reduce the viscosity of asphalt, making it easier for the regenerant to penetrate and disperse. Moreover, the saturated hydrocarbons and small-molecule aromatic hydrocarbons in kerosene can supplement the saturated and aromatic components in asphalt, helping to balance the components of aged asphalt and thus restoring its performance. At the same time, when kerosene is applied to the asphalt regenerant, it is detected that during actual application, the flash point of the asphalt regenerant is 230 (the standard is 220), which does not affect the safety of the asphalt regenerant.

[0015] According to some preferred embodiments, the non-amine anti-stripping agent includes at least one of oleic acid, stearic acid, glycerol ester, and sorbitan ester. By using non-amine substances, the environmental pollution and human health risks that may be brought about by using amine compounds are avoided. Moreover, the non-amine anti-stripping agent can form chemical bonds with the resin in asphalt, enhancing the adhesion between asphalt and aggregates. And the non-amine anti-stripping agent can increase the contact angle between asphalt and water, reducing the erosion and damage of water to the asphalt pavement, thereby extending the service life of the road.

[0016] According to some preferred embodiments, the anti-ultraviolet aging agent is ZnGa2O4:Cr 3+ ,Na + phosphor; the raw material components of the anti-ultraviolet aging agent include 10 - 20 parts of zinc oxide, 20 - 40 parts of gallium oxide, 1 - 8 parts of sodium chloride, and 1 - 8 parts of chromium oxide. The anti-ultraviolet aging agent provided by the present invention can not only effectively absorb or reflect ultraviolet rays, but also form chemical bonds with asphalt molecules, enhancing the overall anti-aging performance of asphalt materials. That is to say, when the phosphor is irradiated by ultraviolet light, it can absorb the energy of the ultraviolet light and convert it into visible light or other forms of energy, thereby reducing the direct ultraviolet damage to the material.

[0017] According to some preferred embodiments, the preparation method of the anti-ultraviolet aging agent is

[0018] A1 Mix zinc oxide, gallium oxide, sodium chloride, and chromium oxide by grinding to obtain a pretreatment material, and pre-calcine the pretreatment material in a box furnace at a calcination temperature of 800 - 1000 °C and a combustion atmosphere of hydrogen to obtain a first intermediate product;

[0019] After grinding the first intermediate, it is calcined in a box furnace with a combustion atmosphere of hydrogen and a calcination temperature of 1450 - 1600 °C to form a second intermediate;

[0020] A3 The second intermediate is ground to obtain ZnGa2O4:Cr 3+ ,Na + phosphor.

[0021] According to some preferred embodiments, the stabilizer is a ball-milled product of stearic acid, modified nanocellulose, extraction oil, and titanium dioxide; the mass ratio of stearic acid, modified nanocellulose, extraction oil, and titanium dioxide is 0.1 - 0.3:1:1 - 2.5:0.3 - 0.5. In the stabilizer, by utilizing the specific surface area and strength advantages of nanocellulose and adding it to asphalt, the adhesion and viscosity of asphalt can be improved, which is conducive to the formation and maintenance of a network structure. In addition, by modifying nanocellulose, not only can its compatibility with asphalt be enhanced, but the modified nanocellulose can enhance the bonding strength with asphalt through non-covalent bond interactions. At the same time, based on good compatibility, it is conducive to the transfer of load stress between asphalt and nanocellulose. Furthermore, in the present invention, by compounding stearic acid, modified nanocellulose, extraction oil, and titanium dioxide, the extraction oil can soften the aged asphalt and reduce the brittleness of asphalt, and titanium dioxide can also reduce the aging effect of ultraviolet rays on asphalt. Through mechanical activation treatment, not only can the agglomeration of titanium dioxide be avoided, but also a connection can be formed among the above-mentioned components, avoiding the agglomeration problem that exists when added alone, that is, the compatibility with asphalt can be improved. When blended with asphalt again, it is not only conducive to forming a stable network structure with asphalt, but also can avoid degradation caused by the influence of the external environment, that is, the weather resistance is improved.

[0022] According to some preferred embodiments, the preparation method of the stabilizer is

[0023] B1 Nanocellulose is dispersed in an aqueous solution of vinyl silane ethanol with a concentration of 0.1 - 2 wt%, and treated under ultrasonic waves of 600 - 1200 W for 30 - 90 min while maintaining the temperature at 30 - 50 °C; the mass ratio of nanocellulose to the aqueous solution of vinyl silane ethanol is 1:100 - 200; after the ultrasonic treatment, the treated nanocellulose is obtained through washing, centrifugation, and drying; the vinyl silane includes at least one of vinyl trimethoxysilane and vinyl triethoxysilane;

[0024] The nanocellulose after B2 treatment was dispersed in dimethyl sulfoxide, and ultrasonic blending was carried out. Then, a thiol compound was added and ultrasonic blending was continued. Subsequently, a photoinitiator was added, and stirring was continued until complete dissolution. Then, the reaction system was placed under an ultraviolet light source and irradiated for 10 - 30 min. After completion, the modified nanocellulose was obtained by centrifugation, washing, and suction filtration. The mass ratio of nanocellulose, thiol compound, and photoinitiator was 1:10 - 20:0.08 - 0.45;

[0025] B3 Stearic acid, modified nanocellulose, extracted oil, and titanium dioxide were subjected to ball milling at 3000 - 6000 rpm for 5 - 30 min to obtain the stabilizer.

[0026] Second, a preparation method of the anti-ultraviolet aging and environmentally friendly asphalt rejuvenator mentioned above is provided, including the following steps:

[0027] S1 Vegetable-based light oil fraction, anti-ultraviolet aging agent, epoxy plasticizer, elastic recovery agent, reducing agent, inorganic rare earth ion complexing agent, and stabilizer were added to a high-speed shearer. The temperature was set at 120 - 150 °C and the rotation speed was 3000 - 5000 rpm. After mixing, a first mixture was obtained;

[0028] S2 The first mixture was continuously refined in the high-speed shearer. The temperature was set at 150 - 180 °C, the rotation speed was 5000 - 8000 rpm, and the treatment time was 1 - 2 h to obtain a second treated product;

[0029] S3 The second blend was cooled to 100 - 130 °C, stirring was maintained, a penetrant and a non-amine anti-stripping agent were added, and stirring was continued at a rotation speed of 3000 - 5000 rpm for 0.5 - 1 h to obtain the asphalt rejuvenator.

[0030] Beneficial effects achieved by the present invention

[0031] (1) For the asphalt rejuvenator provided by the present invention, by adding an anti-ultraviolet aging agent, the anti-aging performance of the asphalt rejuvenator in high-altitude environments is significantly improved, and the service life of the road is extended;

[0032] (2) For the asphalt rejuvenator provided by the present invention, environmentally friendly raw materials such as vegetable oil-based light oil fraction, epoxy plasticizer, anti-stripping agent, and regenerated diatomaceous earth-based reducing agent are used, reducing environmental pollution and meeting the requirements of sustainable development;

[0033] (3) For the asphalt rejuvenator provided by the present invention, by adding a stabilizer, not only can the compatibility with asphalt be improved to form a stable network structure, but also its weather resistance can be enhanced and its anti-aging performance can be improved;

[0034] (4) The asphalt rejuvenator provided by the present invention has the advantages of simple process, low requirements for equipment, and being easy for large-scale production;

[0035] (5) The asphalt rejuvenator provided by the present invention uses plant-based light oil as the basic carrier, providing the rejuvenator with permeability and the ability to swell asphalt components, thus forming an interpenetrating network structure with epoxy plasticizers to enhance the flexibility of molecular chains. The bio-based characteristics and rare earth complexing agents jointly construct an environmentally friendly system; adding ZnGa2O4:Cr 3+ ,Na + The phosphor generates a long afterglow luminescence effect through ultraviolet light excitation, continuously absorbs and converts ultraviolet energy, and forms an energy-level matching composite light protection system with rare earth oxides. The nanoscale particle size (controlled by the preparation process) enhances the dispersibility in the matrix; adding epoxy groups in the epoxy plasticizer to undergo ring-opening reactions with the polar components of asphaltene, reconstructing the molecular cross-linking network and cooperating with vegetable oils to reduce the system viscosity, improve the low-temperature construction performance, inhibit the aggregation of phosphors, and ensure the stability of the ultraviolet protection function; adding submicron elastic restorers to achieve the filling and repair of asphalt microcracks through particle size control (<10 μm). The polyurethane / polypropylene composite system forms a gradient modulus structure and has a coordination effect with rare earth ions to enhance the interfacial bonding strength; using the porous structure of regenerated diatomaceous earth to adsorb the polar components in aged asphalt. The nanoscale particle size (<5 μm) and phosphors form a light scattering synergistic effect, and the surface hydroxyl groups chemically bond with the stabilizer components; using the rare earth ions in the rare earth complexing agent to form a chelating structure with asphaltene, inhibiting the oxidation free radical chain reaction, constituting an energy transfer channel with phosphors, prolonging the ultraviolet protection time, and synergistically improving the interfacial bonding strength with an anti-stripping agent; using the modified nanocellulose in the stabilizer to construct a three-dimensional network framework structure, and titanium dioxide and stearic acid form a photo-thermal stability synergistic protection.

[0036] (6) The asphalt rejuvenator provided by the present invention can effectively restore the performance of waste matrix asphalt. The regenerated aged asphalt can basically be restored to the level of matrix asphalt, reducing the supply pressure of matrix asphalt. And it is applicable to the road maintenance and repair in plateau and high altitude areas, with significant social and economic benefits. Description of the Drawings

[0037] Figure 1 is the absorption spectrum of the anti-ultraviolet aging agent prepared in Examples 1-2 in the ultraviolet region;

[0038] Figure 2 is the long afterglow spectrum of the anti-ultraviolet aging agent prepared in Examples 1-2 monitored at a wavelength of 700 nm;

[0039] Figure 3 is the afterglow photo of the anti-ultraviolet aging agent prepared in Example 2 after ultraviolet excitation. Detailed Embodiments

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. For those not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For reagents or instruments without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0041] It should be noted here that the test methods for the following technical indicators are the contents in the "Test Procedures for Bitumen and Bituminous Mixtures in Highway Engineering", which are well-known to those skilled in the art, so they will not be elaborated here.

[0042] All chemical reagents used in the embodiments of the present invention are of analytical pure grade products.

[0043] Example 1

[0044] The preparation method of the anti-ultraviolet aging agent is as follows: Weigh 10 mol of ZnO, 20 mol of Ga2O3, 1 mol of NaCl, and 1 mol of Cr2O3, which are 814 g, 2038.6 g, 58.4 g, and 152 g respectively. Grind for 45 min to make the mixture evenly mixed, pre-calcine in a box furnace (hydrogen is passed) at 1000 °C for 9 h, then grind for another 45 min. Put the sample into the box furnace and calcine (hydrogen is passed) at 1450 °C for 16 h. After grinding for 45 min, the anti-ultraviolet aging agent is obtained.

[0045] Example 2

[0046] The preparation method of the anti-ultraviolet aging agent is as follows:

[0047] Weigh 15 mol of ZnO, 30 mol of Ga2O3, 5 mol of NaCl, and 5 mol of Cr2O3, which are 1220.8 g, 3057.9 g, 292.2 g, and 759.9 g respectively. Grind for 45 min to make the mixture evenly mixed, pre-calcine in a box furnace (hydrogen is passed) at 1000 °C for 9 h, then grind for another 45 min. Put the sample into the box furnace and calcine (hydrogen is passed) at 1450 °C for 16 h. After grinding for 45 min, the anti-ultraviolet aging agent is obtained.

[0048] Example 3

[0049] This example provides an anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to the plateau environment, which includes the following components:

[0050] 60 parts of linseed oil, 5 parts of anti-ultraviolet aging agent (Example 2), 5 parts of epoxy linseed oil, 10 parts of polyurethane, 5 parts of regenerated diatomite-based reducing agent, 5 parts of nano-europium oxide (particle size 100 nm), 5 parts of kerosene, 5 parts of glyceride, and 5 parts of stabilizer.

[0051] The preparation method of the stabilizer is as follows: the nanocellulose is dispersed in a 1wt% vinyltrimethylsilane ethanol aqueous solution (the volume ratio of ethanol to water is 9:1), the mass ratio of the nanocellulose to the vinyltrimethylsilane ethanol aqueous solution is 1:180, and the nanocellulose is subjected to ultrasonic treatment at 800W for 60 minutes, maintained at 45°C, and then washed, centrifuged, and dried to obtain the treated nanocellulose. The treated nanocellulose is dispersed in dimethyl sulfoxide, ultrasonically blended, and then diethylene glycol di(3-mercaptopropionic acid) ester is added to continue ultrasonic blending, and then a photoinitiator Irgacure 2959 is added, and stirring is continued until the solution is completely dissolved; the reaction system is then placed under an ultraviolet light source with a wavelength of 365nm and irradiated for 15 minutes; after completion, the modified nanocellulose is obtained by centrifugation, washing, and suction filtration; the mass ratio of the nanocellulose, diethylene glycol di(3-mercaptopropionic acid) ester, and Irgacure 2959 is 1:18:0.3. Stearic acid, modified nanocellulose, extracted oil and titanium dioxide were ball-milled at 5000 rpm / min for 15 min, wherein the mass ratio of the above-mentioned was 0.2:1:2:0.5, to obtain a stabilizer.

[0052] The preparation method of the above-mentioned regeneration agent and regenerated asphalt comprises the following steps:

[0053] S1 prepares all the above ingredients according to the formula ratio and pre-processes them. Linseed oil needs to be refined to remove impurities and odors; other ingredients need to be ground to a specified fineness to ensure their uniform dispersion in the asphalt.

[0054] S2 adds the pretreated linseed oil, anti-ultraviolet aging agent, epoxy soybean oil, polyurethane, regenerated diatomaceous earth-based reducing agent, nano europium oxide and stabilizer into a high-speed shearing machine, sets the temperature to 120-150°C and the speed to 3000-5000rpm / min, and premixes until a uniform mixture is formed.

[0055] S3 further refines the pre-mixed mixture in a high-speed shearing machine, with the set temperature at 180°C, the rotation speed at 8000 rpm / min, and the processing time at 1 h to ensure that each component fully reacts and reaches the specified fineness requirement.

[0056] S4: Cool the refined mixture to 130°C, gradually add kerosene and non-amine anti-stripping agent under stirring conditions, and continue stirring at a speed of 5000 rpm / min for 0.5 h to evenly mix the components to obtain an asphalt regeneration agent.

[0057] S5 Cool the mixed regeneration agent to room temperature and filter to remove impurities. Store the obtained asphalt regeneration agent in a dry and cool place, avoiding direct sunlight and high temperature environment.

[0058] Example 4

[0059] The difference between this embodiment and Embodiment 3 lies in that the components of the raw materials are different. Specifically: 70 parts of linseed oil, 5 parts of anti-ultraviolet aging agent, 5 parts of epoxy linseed oil, 5 parts of polyurethane, 5 parts of regenerated diatomite-based reducing agent, 5 parts of nano-europium oxide, 3 parts of kerosene, 2 parts of glyceride, and 3 parts of stabilizer.

[0060] Control Example 1

[0061] The original SK-70# A-grade matrix asphalt was selected as Standard Reference Example 1.

[0062] Control Example 2

[0063] The aged asphalt prepared by subjecting the original SK-70# A-grade matrix asphalt to rotary thin-film oven and PAV aging according to the specification requirements was selected as Standard Reference Example 2.

[0064] Comparative Example 1

[0065] The EVOFLEX8182 type asphalt rejuvenator produced by the commercially available Yingjieweitai Company was selected and incorporated into the waste asphalt material for regeneration and repair.

[0066] Comparative Example 2

[0067] The difference between this comparative example and Embodiment 3 lies in that no stabilizer was added.

[0068] Comparative Example 3

[0069] The difference between this comparative example and Embodiment 3 lies in that the stabilizer is stearic acid.

[0070] Comparative Example 4

[0071] The difference between this comparative example and Embodiment 3 lies in that the stabilizer was not ball-milled and was directly blended.

[0072] Test Example

[0073] 1. Fluorescence performance test

[0074] The anti-ultraviolet aging agent prepared in Examples 1-2 was subjected to fluorescence performance test to test the luminescence time, luminescence intensity and weather resistance of this anti-ultraviolet aging agent. The results are shown in Table 1. The ultraviolet-visible light absorption spectrum is shown in Figure 1 , the long afterglow spectrum is shown in Figure 2 , and the afterglow photo of the anti-ultraviolet aging agent after being excited by ultraviolet light is shown in Figure 3 .

[0075] Table 1 Fluorescence performance of anti-ultraviolet aging agent

[0076] Test items Index Example 1 Example 2 Luminescence time (h) ≥6 8.2 8.5 <![CDATA[Luminous intensity (mcd / m 2 )]]> ≥6000 9001 9958 Weather resistance (range of change in brightness factor) ≤20％ 10.1％ 9.8％

[0077] ByFigure 2 It can be seen that by measuring the ultraviolet-visible light absorption spectrum of the phosphor, its absorption intensity at different wavelengths can be understood. The test spectrum shows that the anti-ultraviolet aging agent has a strong absorption peak in the ultraviolet region, proving its ultraviolet absorption function. In addition, based on the above comprehensive detection data, it shows that the anti-ultraviolet aging agent prepared in Examples 1-2 has excellent fluorescence properties.

[0078] 2. Asphalt Performance Recovery Test

[0079] The asphalt rejuvenator provided by the present invention is used to recover the performance of asphalt after long-term aging. The asphalt rejuvenators of Examples 3-4 and Comparative Examples 1-4 are respectively added to the aged asphalt at a dosage of 6%, mixed at 145°C, and stirred at a speed of 600 revolutions per minute for 15 minutes. Among them, the aged asphalt is obtained by aging 70# base asphalt in a rotating oven at 163°C for 5 hours and then heating it in a pressure aging vessel at 100°C and 2.1 Mpa for 20 hours.

[0080] The prepared recycled asphalt is subjected to penetration, ductility, softening point, anti-aging test, dynamic shear rheology test, bending creep stiffness, and bending beam rheology test on the above-prepared recycled asphalt, base asphalt, and aged asphalt respectively according to the corresponding test methods in JTGE20 2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The test results are shown in Tables 2 and 3.

[0081] Table 2 Test Data of Penetration, Ductility, Softening Point and Anti-aging Performance

[0082]

[0083] Table 3 Test Data of Bending Beam Rheology (BBR) and Dynamic Shear Rheology (DSR)

[0084]

[0085] In summary, the recycled asphalt prepared by the rejuvenator of the present invention has an excellent effect of restoring the performance of aged asphalt, is superior to the commercially available rejuvenator products listed in the control examples, and has a more significant effect in terms of anti-aging performance. It shows that the addition of the asphalt rejuvenator of the present invention breaks the original system of aged asphalt, enables the components to be redissolved, rebalances the proportion of each component, improves the stability of the recycled asphalt, is more suitable for the harsh environment of high plateaus and high altitudes, and shows good market application and promotion value.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to plateau environments, characterized in that, The raw material components are calculated by weight and include: 60-70 parts of plant-based light oil, 5-10 parts of anti-ultraviolet aging agent, 5-10 parts of epoxy plasticizer, 5-10 parts of elastic recovery agent, 5-10 parts of reducing agent, 5-10 parts of inorganic rare earth ion complexing agent, 1-5 parts of penetrant, 1-5 parts of non-amine anti-stripping agent, and 1-5 parts of stabilizer.

2. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to plateau environments according to claim 1, wherein The plant-based light oil includes at least one of linseed oil, soybean oil and rapeseed oil.

3. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to the plateau environment according to claim 1, wherein The epoxy plasticizer includes epoxy soybean oil, epoxy linseed oil, epoxy butyl stearate, epoxy fatty acid methyl ester, epoxy styrene; and / or, the elastic recovery agent includes at least one of polypropylene and polyurethane; the particle size of the elastic recovery agent is less than 10 μm.

4. The anti-ultraviolet aging and environment-friendly asphalt rejuvenator applicable to plateau environment according to claim 1, characterized in that, The reducing agent is regenerated diatomaceous earth, and the particle size of the reducing agent is less than 5 μm.

5. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to the plateau environment according to claim 1, wherein, The inorganic rare earth complexing agent includes at least one of cerium oxide, lanthanum oxide, yttrium oxide, ytterbium oxide, and europium oxide; and / or the penetrant includes at least one of kerosene and rubber oil; and / or the non-amine anti-stripping agent includes at least one of oleic acid, stearic acid, glycerol ester, and sorbitol ester.

6. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to plateau environments according to any one of claims 1 to 5, characterized in that, The ultraviolet aging resistant agent is ZnGa2O4:Cr 3+ ,Na + Phosphor; The raw material components of the ultraviolet aging resistant agent include 10-20 parts of zinc oxide, 20-40 parts of gallium oxide, 1-8 parts of sodium chloride, and 1-8 parts of chromium oxide.

7. The anti-ultraviolet aging and environment-friendly asphalt rejuvenator applicable to plateau environment according to claim 6, characterized in that, The preparation method of the anti-ultraviolet aging agent is as follows: A1: Grind and blend zinc oxide, gallium oxide, sodium chloride and chromium oxide to obtain a pretreated material, and pre-sinter the pretreated material in a box furnace at a calcination temperature of 800-1000° C. in a combustion atmosphere of hydrogen to obtain a first intermediate; A2 grinds the first intermediate and then calcines it in a box furnace in a hydrogen atmosphere at a calcination temperature of 1450-1600° C. to form a second intermediate; A3 grinds the second intermediate to obtain ZnGa2O4:Cr 3+ ,Na + phosphor.

8. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to plateau environments according to any one of claims 1 to 5, characterized in that, The stabilizer is a ball-milled product of stearic acid, modified nanocellulose, extracted oil and titanium dioxide; the mass ratio of stearic acid, modified nanocellulose, extracted oil and titanium dioxide is 0.1-0.3:1:1-2.5:0.3-0.

5.

9. The anti-ultraviolet aging and environmentally friendly asphalt rejuvenator applicable to plateau environment according to claim 8, wherein The preparation method of the stabilizer is: B1 Nanocellulose is dispersed in a 0.1-2wt% vinylsilane ethanol aqueous solution, and treated at 600-1200W ultrasound for 30-90min, maintaining the temperature at 30-50°C; the mass ratio of nanocellulose to vinylsilane ethanol aqueous solution is 1:100-200; after the ultrasound, the treated nanocellulose is washed, centrifuged and dried; the vinyl silane includes at least one of vinyltrimethoxysilane and vinyltriethoxysilane; The nanocellulose treated with B2 is dispersed in dimethyl sulfoxide, and ultrasonically blended. A thiol compound is added and ultrasonically blended. Then, a photoinitiator is added and stirred until the mixture is completely dissolved. The reaction system is then placed under an ultraviolet light source and irradiated for 10 to 30 minutes. After the reaction is completed, the modified nanocellulose is obtained by centrifugation, washing and filtration. The mass ratio of nanocellulose, thiol compound and photoinitiator is 1:10-20:0.08-0.45; B3: Stearic acid, modified nanocellulose, extracted oil and titanium dioxide are ball-milled at 3000-6000 rpm / min for 5-30 min to obtain a stabilizer.

10. A preparation method of the anti-ultraviolet aging and environment-friendly asphalt rejuvenator according to any one of claims 1 to 9, characterized in that, The steps include: The plant-based light oil fraction, ultraviolet aging inhibitor, epoxy plasticizer, elastic recovery agent, reducing agent, inorganic rare earth ion complexing agent and stabilizer are added to a high-speed shearing machine, the temperature is set at 120 - 150 °C, the rotation speed is 3000 - 5000 rpm / min, and after mixing, a first mixture is obtained; The first mixture continues to be refined in the high-speed shearing machine, the temperature is set at 150 - 180 °C, the rotation speed is 5000 - 8000 rpm / min, and the treatment time is 1 - 2 h to obtain a second treated product; The second blend is cooled to 100 - 130 °C, stirring is maintained, a penetrant and a non-amine anti-stripping agent are added, and stirring is continued at a rotation speed of 3000 - 5000 rpm / min for 0.5 - 1 h to obtain an asphalt rejuvenator.

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