High-content surface functionalized rubber powder modified asphalt, preparation method and application thereof

Abstract

The application provides a high-content surface functionalized rubber powder modified asphalt as well as a preparation method and application thereof, and belongs to the technical field of road engineering. The preparation method of the high-content surface functionalized rubber powder modified asphalt provided by the application comprises the following steps: (1) performing ring-opening reaction on a mixture of an epoxy bio-oil and an amine to obtain a bio-oil-based modifier; (2) performing desulfurization on waste radial tire rubber powder to obtain desulfurized rubber powder, and then mixing the desulfurized rubber powder with the bio-oil-based modifier obtained in step (1) to obtain a mixture; (3) performing graft modification on the mixture obtained in step (2) under microwave irradiation to obtain bio-oil-based surface functionalized waste rubber powder; and (4) mixing the bio-oil-based surface functionalized waste rubber powder obtained in step (3) with base asphalt, and then performing shearing emulsification to obtain the high-content surface functionalized rubber powder modified asphalt.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering, and in particular to a high-content surface functionalized rubber powder modified asphalt and a preparation method and application thereof. Background Art

[0002] With the rapid development of the automotive industry, the market demand for tires continues to expand, driving the expansion and upgrading of tire production. However, as a consumable product, tires are eventually transformed into industrial waste - scrap tires - through continuous tread wear, rubber aging, and external damage. Existing disposal methods include tire retreading, producing recycled rubber, cracking and recycling, and crushing into rubber powder. Although tire retreading can effectively treat scrap tires, the volume of tires it consumes is relatively small, far from balancing the output of scrap tires. Recycled rubber and cracking and recycling both cause serious environmental pollution. The "low energy consumption, low emissions, high consumption, and high efficiency" treatment method has become a hot topic for solving the recycling and reuse of scrap tires.

[0003] Crushing and grinding waste tires into rubber powder, followed by a regeneration method that breaks sulfur bonds through heat, force, and chemical reactions, is the most effective waste tire treatment method. Since the 1930s, waste tire rubber powder has been used in asphalt modification. This method not only effectively improves asphalt's rutting resistance, rebound, fatigue resistance, aging resistance, and low-temperature cracking resistance, but also allows for a large consumption of waste tires. Compared to traditional styrene-butadiene-styrene block copolymer (SBS)-modified asphalt, rubber rubber powder-modified asphalt has a wider source of raw materials and is less expensive. Furthermore, the rubber powder content in rubber rubber-modified asphalt is typically above 15%, far exceeding the 4% commonly used for SBS. This significantly reduces asphalt usage under the same conditions, making it a green and sustainable asphalt modification method. However, the rubber powder content of currently common rubber asphalt is generally less than 20%. This high content of rubber powder leads to a series of problems, such as segregation, high viscosity, and difficulty in construction. This significantly limits the consumption of waste tire rubber powder and further limits the cost control of modified asphalt.

[0004] Therefore, proposing a method for preparing high-dosage, high-performance surface functionalized rubber powder modified asphalt has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-content surface functionalized rubber powder modified asphalt and its preparation method and application. The rubber powder content in the high-content surface functionalized rubber powder modified asphalt provided by the present invention can reach 60%, and the obtained surface functionalized rubber powder modified asphalt has excellent low-temperature toughness and high-temperature stability.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The application provides a preparation method of high-content surface functionalized rubber powder modified asphalt.

[0008] (1) performing ring-opening reaction on the mixed epoxy bio-oil and amine to obtain a bio-oil based modifier;

[0009] (2) performing desulfurization on the waste radial tire rubber powder to obtain desulfurized rubber powder, and then mixing the desulfurized rubber powder with the bio-oil based modifier obtained in the step (1) to obtain a mixture;

[0010] (3) performing graft modification on the mixture obtained in the step (2) under microwave irradiation to obtain bio-oil based surface functionalized waste rubber powder;

[0011] (4) mixing the bio-oil based surface functionalized waste rubber powder obtained in the step (3) with base asphalt, and then performing shear emulsification to obtain high-content surface functionalized rubber powder modified asphalt.

[0012] Preferably, the epoxy bio-oil in the step (1) is any one of epoxy soybean oil, mixed crude oil and epoxy linseed oil, and the amine is any one or two of triethylene tetramine, tetraethylene pentamine and pentaethylene hexamine.

[0013] Preferably, the molar ratio of the epoxy bio-oil to the amine in the step (1) is 1:(1-1.5).

[0014] Preferably, the temperature of the ring-opening reaction in the step (1) is 50-70 DEG C, and the time of the ring-opening reaction is 1-5h.

[0015] Preferably, the mass ratio of the desulfurized rubber powder to the bio-oil based modifier in the step (2) is (0.5-2):1.

[0016] Preferably, the mixing time in the step (2) is 12-24h.

[0017] Preferably, the power of the microwave irradiation in the step (3) is 800-1000W or the frequency of the power adjustable 2450W microwave is 400MHz, and the time of the microwave irradiation is 2-10min.

[0018] Preferably, the rotating speed of the shear emulsification in the step (4) is 1000-7000r / min, and the total time of the shear emulsification is 1-10min.

[0019] The application provides high-content surface functionalized rubber powder modified asphalt prepared by the preparation method.

[0020] The application provides application of the high-content surface functionalized rubber powder modified asphalt in road engineering.

[0021] The application provides a preparation method of high-content surface functionalized rubber powder modified asphalt, comprising the following steps: (1) mixing epoxy bio-oil and amine and then performing ring-opening reaction to obtain a bio-oil based modifier; (2) performing desulfurization on waste radial tire rubber powder to obtain desulfurized rubber powder, and then mixing the desulfurized rubber powder with the bio-oil based modifier obtained in step (1) to obtain a mixture; (3) performing graft modification on the mixture obtained in step (2) under microwave irradiation to obtain bio-oil based surface functionalized waste rubber powder; and (4) mixing the bio-oil based surface functionalized waste rubber powder obtained in step (3) with base asphalt and then performing shear emulsification to obtain high-content surface functionalized rubber powder modified asphalt. In the application, the bio-modifier is prepared by ring-opening reaction of amine and epoxy groups, then the bio-modifier is adsorbed onto the surface of rubber through physical adsorption, and finally graft modification is performed under microwave irradiation. Under the action of microwave irradiation, free radicals are generated on the rubber molecules, and the free radicals interact with the activated amine groups and amide groups of the bio-oil based modifier to form C-N groups. The functional groups can increase the polarity of the surface of the rubber powder and improve the adhesion between the rubber powder and the asphalt, so that the effects of high content, inhibition of segregation and excellent high and low temperature performance are achieved. The bio-oil based molecular chains are covalently grafted onto the surface of the desulfurized rubber powder. The bio-oil based molecular chains can be infinitely miscible with asphalt. On the one hand, the bio-oil based molecular chains can soften the asphalt and increase the content of the desulfurized rubber powder. On the other hand, the intermingled molecular chains can reduce the degree of segregation and improve the low temperature toughness and high temperature stability of the asphalt. In addition, the graft covalent bonds formed during the modification process can further improve the miscibility with the base asphalt, thereby effectively improving the compatibility of the asphalt and the rubber powder, reducing the problems such as agglomeration of the rubber powder caused by high crosslinking and low surface activity of the rubber, and preparing the modified asphalt with high rubber powder content and excellent performance. The content of the rubber powder in the modified asphalt prepared by the method can reach 60%. The preparation method is simple, has high universality and easy-to-control process parameters, is green and environmentally friendly, simple and efficient, can consume a large amount of waste rubber, is suitable for various asphalts, and the high-content surface functionalized rubber powder modified asphalt obtained has excellent low temperature toughness and high temperature stability, and has obvious advantages compared with traditional bio-oil modified asphalt. The results of the examples show that when the content of the bio-oil based surface functionalized waste rubber powder in the high-content surface functionalized rubber powder modified asphalt provided by the application is 60% of the mass of the base asphalt, the ductility can be increased by 33% compared with the comparative example 2 and by 96% compared with the comparative example 3, and the low temperature toughness is significantly improved. The softening point test is used to characterize the high temperature stability of the asphalt, and it can be found that the addition of the bio-oil based surface functionalized waste rubber powder can improve the low temperature toughness and high temperature stability of the asphalt. The softening point can be increased by 13% compared with the comparative example 2 and by 20% compared with the comparative example 3 when the content of the bio-oil based surface functionalized waste rubber powder (MDCR) is as high as 60%. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1FTIR test characterization chart of ESO, TETA and ESO / TETA bio-oil based modifier in Example 2;

[0023] Figure 2 FTIR test characterization chart of DCR and DCR after surface functionalization by ESO / TETA bio-oil based modifier in Example 2. DETAILED DESCRIPTION

[0024] The application provides a preparation method of high-content surface functionalized rubber powder modified asphalt, comprising the following steps:

[0025] (1) mixing epoxy bio-oil and amine and then performing ring-opening reaction to obtain bio-oil based modifier;

[0026] (2) performing desulfurization on waste radial tire rubber powder to obtain desulfurized rubber powder (DCR), and then mixing the desulfurized rubber powder with the bio-oil based modifier obtained in step (1) to obtain a mixture;

[0027] (3) performing graft modification on the mixture obtained in step (2) under microwave irradiation to obtain bio-oil based surface functionalized waste rubber powder;

[0028] (4) mixing the bio-oil based surface functionalized waste rubber powder obtained in step (3) with base asphalt and then performing shear emulsification to obtain high-content surface functionalized rubber powder modified asphalt.

[0029] In the application, if no special requirement is needed, all the raw materials used are commercially available products which are well known to those skilled in the art.

[0030] The application mixes epoxy bio-oil and amine and then performs ring-opening reaction to obtain bio-oil based modifier.

[0031] In the application, the epoxy bio-oil is preferably any one of epoxy soybean oil (ESO), mixed crude oil (EPSO) and epoxy linseed oil.

[0032] In the application, the amine is preferably any one or two of triethylene tetramine (TETA), tetraethylene pentamine and pentaethylene hexamine. In the application, when the amine is preferably two of triethylene tetramine, tetraethylene pentamine and pentaethylene hexamine, the two amines are mixed in any ratio.

[0033] In the present application, the molar ratio of the epoxy bio-oil and the amine is preferably 1:(1-1.5), more preferably 1:1. By controlling the molar ratio of the epoxy bio-oil and the amine, the present application can make the epoxy groups in the epoxy bio-oil react with the primary amine and secondary amine groups in the amine, and the epoxy groups completely react, while the remaining primary amine groups in the amine can esterify with the ester groups in the epoxy bio-oil to form amide groups, which play a positive role in promoting the subsequent grafting reaction with DCR.

[0034] In the present application, the temperature of the ring-opening reaction is preferably 50-70℃, more preferably 55-65℃, and further preferably 60℃; the time of the ring-opening reaction is preferably 1-5h, more preferably 2-4h, and further preferably 3h. By controlling the temperature and time of the ring-opening reaction, the present application can avoid the problem of low reaction efficiency caused by too low temperature, so that the amine groups and the epoxy groups can completely react.

[0035] After obtaining the bio-oil-based modifier, the present application desulfurizes the waste radial tire rubber powder to obtain desulfurized rubber powder, which is then mixed with the bio-oil-based modifier to obtain a mixture.

[0036] In the present application, the particle size of the waste radial tire rubber powder is preferably 24-48 mesh. By controlling the particle size of the waste radial tire rubber powder, the present application can make it have a larger specific surface area, thereby having better adsorption capacity and being able to adsorb more bio-oil-based modifier.

[0037] In the present application, the waste radial tire rubber powder is preferably washed and dried in sequence before desulfurization. The present application does not have special limitations on the specific method of washing, which can be determined according to the technical common sense of those skilled in the art, as long as the dust on the waste radial tire rubber powder can be removed.

[0038] In the present application, the desulfurization method is preferably thermal mechanical desulfurization of the waste radial tire rubber powder by a twin-screw extruder at 200℃.

[0039] In the present application, the mass ratio of the desulfurized rubber powder and the bio-oil-based modifier is preferably (0.5-2):1, more preferably (0.6-1.5):1, and further preferably (0.8-1):1. By controlling the ratio of the two, the present application can improve the modification effect while avoiding waste of raw materials.

[0040] In the present application, the mixing time is preferably 12-24h, more preferably 15-21h, and further preferably 18h. By controlling the mixing time, the present application can make the waste radial tire rubber powder sufficiently adsorb the bio-oil-based modifier.

[0041] After obtaining the mixture, the present application grafts and modifies the mixture under microwave irradiation to obtain the waste rubber powder functionalized by bio-oil-based surface.

[0042] In the present application, the power of the microwave irradiation is 800-1000 W or the power-adjustable 2450 W microwave with a frequency of 400 MHz; the time of the microwave irradiation is preferably 2-10 min, more preferably 5-8 min. By controlling the parameters of the microwave irradiation, the present application can avoid too short microwave time and low grafting rate, and can also avoid too long microwave time and the aging of the main chain of the devulcanized tire, which leads to the cracking of the main chain and the decrease of the softening point of the modified asphalt.

[0043] After the grafting modification is completed, the present application preferably uses ethanol to sequentially clean and dry the product of the grafting modification. The present application does not have special limitations on the specific number of cleaning, which can be determined according to the technical knowledge of those skilled in the art. By using ethanol for cleaning, the present application can remove free bio-modifiers.

[0044] After obtaining the waste rubber powder functionalized by bio-oil-based surface, the present application mixes the waste rubber powder functionalized by bio-oil-based surface and the base asphalt to perform shear emulsification, thereby obtaining the high-content surface-functionalized rubber powder modified asphalt.

[0045] In the present application, the base asphalt is preferably No. 70 asphalt or No. 90 asphalt.

[0046] In the present application, the content of the waste rubber powder functionalized by bio-oil-based surface is preferably 20-60% of the mass of the base asphalt, more preferably 30-60%, and further preferably 40-50%. By controlling the content of the rubber powder, the present application can not only ensure a high content of the rubber powder in the high-content surface-functionalized rubber powder modified asphalt, but also ensure that the modified asphalt has excellent low-temperature toughness and high-temperature stability, which has obvious advantages compared with the traditional bio-oil modified asphalt.

[0047] In the present application, the temperature of the mixing is preferably 170-175℃; the time of the mixing is preferably 40-60 min; the mixing is preferably performed under stirring, and the stirring rate is preferably 1000-1500 rpm. By controlling the mixing parameters, the present application can make the components uniformly mixed.

[0048] In the present application, the rotation speed of the shear emulsification is preferably 1000-7000 r / min, more preferably 1000 rpm, 2000 rpm, 3000 rpm, 4000 rpm, 5000 rpm, 6000 rpm and 7000 rpm in sequence; the total time of the shear emulsification is preferably 1-10 min, more preferably 2-8 min, and further preferably 5-6 min.

[0049] The application is prepared by ring-opening reaction of amine group and epoxy group, then is adsorbed to the rubber surface by physical adsorption, and finally is grafted and modified under microwave irradiation, under the action of microwave irradiation, the rubber molecules produce free radicals, the free radicals interact with the activated amine group and amide group of the bio-oil-based modifier to form C-N groups, the functional groups can increase the polarity of the rubber powder surface and improve the adhesion between the rubber powder and the asphalt, so that the effects of high content, inhibition of segregation, excellent high and low temperature performance are achieved; the bio-oil-based molecular chain is covalently grafted on the surface of the devulcanized rubber powder, the bio-oil-based molecular chain can be infinitely miscible with asphalt, on the one hand, the asphalt can be softened, and the content of the devulcanized rubber powder can be increased; on the other hand, the molecular chains that are miscible with each other are intertwined, which can reduce the degree of segregation, improve the low-temperature toughness and high-temperature stability of the asphalt, and form covalent bonds during the modification process, which can further improve the miscibility with the base asphalt, thereby effectively improving the compatibility of the asphalt and the rubber powder, reducing the problems such as agglomeration of the rubber powder caused by high cross-linking of the rubber and low surface activity, and preparing modified asphalt with high content of rubber powder and excellent performance, so that the content of the rubber powder in the modified asphalt reaches 60%; the preparation method is simple, has high universality, and the process parameters are easy to control, and is green, simple and efficient, can consume a large amount of waste rubber, and is suitable for various asphalts, and the high-content surface-functionalized rubber powder modified asphalt has excellent low-temperature toughness and high-temperature stability, and has obvious advantages compared with traditional bio-oil modified asphalt.

[0050] The application provides high-content surface-functionalized rubber powder modified asphalt prepared by the preparation method in the technical scheme.

[0051] The application also provides application of the high-content surface-functionalized rubber powder modified asphalt in road engineering.

[0052] The technical scheme in the application will be clearly and completely described in combination with the embodiments in the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0053] Embodiments 1-2

[0054] A preparation method of high-content surface-functionalized rubber powder modified asphalt comprises the following steps:

[0055] (1) mixing epoxy bio-oil and amine according to a molar ratio of 1:1, and then performing ring-opening reaction to obtain bio-oil-based modifier; the ring-opening reaction is performed at a temperature of 60 DEG C for 1 h;

[0056] (2) washing and drying the waste radial tire rubber powder with anhydrous ethanol in sequence, and then obtaining desulfurized rubber powder by thermal mechanical desulfurization at 200℃ through a double screw extruder, and finally mixing the desulfurized rubber powder with the bio-oil based modifier obtained in step (1) to obtain a mixture; the drying temperature is 80℃, and the drying time is 12h; the mixing time is 12h;

[0057] (3) grafting modification of the mixture obtained in step (2) under microwave irradiation, and finally washing and drying in sequence with anhydrous ethanol to obtain bio-oil based surface functionalized waste rubber powder; the microwave irradiation power is 1000W, and the microwave irradiation time is 4min;

[0058] (4) stirring and mixing the bio-oil based surface functionalized waste rubber powder obtained in step (3) and the base asphalt at 170℃ for 40min, and then shearing and emulsifying at a speed of 1000rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, 6000rpm and 7000rpm for 1min in sequence to obtain high-content surface functionalized rubber powder modified asphalt.

[0059] Comparative Example 1

[0060] Base asphalt

[0061] Comparative Example 2

[0062] A preparation method of a modified asphalt comprises the following steps: washing waste radial tire rubber powder with anhydrous ethanol, drying at 80℃ for 12h, then stirring and mixing with base asphalt at 170℃ for 40min, and finally shearing and emulsifying at a speed of 1000rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, 6000rpm and 7000rpm for 1min in sequence to obtain modified asphalt.

[0063] Comparative Example 3

[0064] A preparation method of a modified asphalt comprises the following steps: washing waste radial tire rubber powder with anhydrous ethanol, drying at 80℃ for 12h, then obtaining desulfurized rubber powder by thermal mechanical desulfurization at 200℃ through a double screw extruder, then stirring and mixing with base asphalt at 170℃ for 40min, and finally shearing and emulsifying at a speed of 1000rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, 6000rpm and 7000rpm for 1min in sequence to obtain modified asphalt.

[0065] The amounts of the components in Examples 1-2 and Comparative Examples 1-3 are shown in Table 1:

[0066] Table 1 Amounts of components in Examples 1-2 and Comparative Examples 1-3

[0067] Example Matrix asphalt (g) CR (g) DCR (g) ESO / TETA (g) Comparative Example 1 300 0 0 0 Comparative Example 2 300 60 0 0 Comparative Example 3 300 0 60 0 Example 1 300 0 60 73 Example 2 300 0 180 220

[0068] Among them, CR is 24 mesh waste radial tire rubber powder, DCR is desulfurized rubber powder, ESO / TETA is bio-oil-based modifier, ESO is epoxidized soybean oil, TETA is triethylenetetramine, and the matrix asphalt is No. 70 asphalt; the equipment used is a high-speed stirring mixer and a high-speed shearing disperser emulsifier; the above ingredients are all commercially available products.

[0069] The properties of the high-content surface functionalized rubber powder modified asphalt prepared in Examples 1-2 and the base asphalt and modified asphalt provided in Comparative Examples 1-3 are shown in Table 2:

[0070] Table 2 Properties of high-content surface functionalized rubber powder modified asphalt prepared in Examples 1-2 and the base asphalt and modified asphalt provided in Comparative Examples 1-3

[0071] Example 5 °C elongation (cm -1 )]]> Softening point (°C) Penetration at 25 °C (mm) Elastic recovery (%) Comparative Example 1 - 46 70 40 Comparative Example 2 8.4 60.8 34.1 80 Comparative Example 3 5.7 57.2 48.5 62 Example 1 8.8 58.4 59.3 66 Example 2 11.2 68.7 83.7 57

[0072] As can be seen from Table 2, when the bio-oil-based surface functionalized waste rubber powder is added at a dosage of 60% of the base asphalt mass, its ductility can be increased by 33% compared to Comparative Example 2 and by 96% compared to Comparative Example 3, and its low-temperature toughness is significantly improved. Using a softening point test to characterize the high-temperature stability of asphalt, it can be found that the addition of bio-oil-based surface functionalized waste rubber powder can significantly improve both the low-temperature toughness and high-temperature stability of asphalt. The softening point at an MDCR dosage of up to 60% can be increased by 13% compared to Comparative Example 2 and by 20% compared to Comparative Example 3. In summary, the high-dosage surface functionalized rubber powder-modified asphalt prepared by the preparation method of the present invention has excellent low-temperature toughness and high-temperature stability. It can also consume a large amount of waste rubber for reuse. The modification method is simple and efficient, and the preparation process is environmentally friendly.

[0073] Figure 1 FTIR test characterization diagram of ESO, TETA and ESO / TETA bio-oil-based modifier in Example 2. Figure 1 It can be seen that 824cm -1 The characteristic absorption peak of ESO epoxy group is at 3291cm, while it has a significantly weakened trend in ESO / TETA bio-oil based modifiers, indicating that the epoxy group has undergone a ring-opening reaction; ESO / TETA will have a characteristic absorption peak at 3291cm -1 The NH stretching vibration peak appears at 1560 cm -1 The NH deformation vibration peak appears at 1658 cm -1 A C=O stretching vibration peak appears at , and these three characteristic absorption peaks are the peaks of the secondary amide group, indicating that the bio-oil-based modifier was successfully prepared.

[0074] Figure 2 FTIR test characterization chart of DCR and DCR after surface functionalization by ESO / TETA bio-oil based modifier in Example 2. From Figure 2 It can be seen that the absorption peak of DCR at 1536 cm -1 is caused by the stretching vibration of "C=C" skeleton, indicating that the rubber powder contains a certain double bond, and the peak of MDCR after ESO / TETA modifier treatment will disappear at this place, and then a new peak value will appear at 1040 cm -1 , indicating the formation of C-N bond, and the characteristic absorption peak appearing near 1740 cm -1 is the -C=O stretching vibration peak in ESO. By analyzing the infrared spectra of DCR before and after modification, it is found that the molecular chain of ESO bio-oil has been covalently grafted on the surface of DCR under the catalysis of microwave grafting.

[0075] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for preparing high-content surface-functionalized rubber powder modified asphalt, comprising the following steps: (1) mixing an epoxy bio-oil and an amine to perform ring-opening reaction, to obtain a bio-oil-based modifier; the amine is any one or two of triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine; the molar ratio of the epoxy bio-oil to the amine in the step (1) is 1: (1-1.5) ; (2) performing desulfurization on waste radial tire rubber powder to obtain desulfurized rubber powder, and then mixing the desulfurized rubber powder with the bio-oil-based modifier obtained in the step (1) to obtain a mixture; the mass ratio of the desulfurized rubber powder to the bio-oil-based modifier in the step (2) is (0.5-2) : 1; (3) performing graft modification on the mixture obtained in the step (2) under microwave irradiation to obtain bio-oil-based surface-functionalized waste rubber powder; (4) mixing the bio-oil-based surface-functionalized waste rubber powder obtained in the step (3) with base asphalt, and then performing shear emulsification to obtain high-content surface-functionalized rubber powder modified asphalt; the content of the bio-oil-based surface-functionalized waste rubber powder is 20-60% of the mass of the base asphalt. The epoxy bio-oil in the step (1) is any one of epoxidized soybean oil and epoxidized linseed oil. The temperature of the ring-opening reaction in the step (1) is 50-70℃, and the time of the ring-opening reaction is 1-5h. The mixing time in the step (2) is 12-24h. The microwave irradiation power in the step (3) is 800-1000W or a power-adjustable 2450W microwave with a frequency of 400MHz, and the time of the microwave irradiation is 2-10min. The rotation speed of the shear emulsification in the step (4) is 1000-7000r / min, and the total time of the shear emulsification is 1-10min.

2. The production method according to claim 1, characterized by, 7.The high-content surface-functionalized rubber powder modified asphalt prepared by the method of any one of claims 1-6.

3. The preparation method according to claim 1, characterized in that 8.The application of the high-content surface-functionalized rubber powder modified asphalt of claim 7 in road engineering.

4. The method of claim 1, wherein, ​ 5. The preparation method according to claim 1, characterized in that ​ 6. The method of claim 1, wherein, ​ ​ ​

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