CN107722648B - High-viscosity high-elasticity modified asphalt and preparation and application thereof - Google Patents
High-viscosity high-elasticity modified asphalt and preparation and application thereof Download PDFInfo
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Abstract
The invention provides high-viscosity high-elasticity modified asphalt which is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 6.5-9.5 parts of SBS graft copolymer, 0.5-2 parts of tackifying resin, 0.1-0.35 part of antioxidant, 0.2-1.5 parts of vulcanizing agent and 0.1-1.0 part of compatilizer rubber oil. The invention also provides a preparation method and application of the high-viscosity high-elasticity modified asphalt. The high-viscosity high-elasticity modified asphalt provided by the invention has good high-temperature stability, low-temperature crack resistance and aging resistance, can replace expensive imported high-viscosity modified asphalt under the condition of not influencing the service performance of the pavement, reduces the construction cost, and can be widely applied to paving domestic high-performance pavements.
Description
Technical Field
The invention belongs to the field of road engineering and the field of compositions based on high polymer compositions, and particularly relates to polyethylene copolymer modified asphalt, and a preparation method and application thereof.
Background
With the rapid development of traffic industry, higher demands are put on the quality of road surfaces, and high-performance road surfaces, multifunctional road surfaces and special road surfaces are produced. Therefore, the development of the modified asphalt faces more challenges, and the common modified asphalt serving as a binding material of the pavement has the problems of low viscosity, insufficient aggregate wrapping thickness, low pavement durability under heavy traffic and the like. In recent years, high-viscosity high-elasticity modified asphalt becomes a research hotspot, and is widely used for paving large-pore water-draining noise-reducing pavements and steel bridge decks. Most of the published patents on high-viscosity modified asphalt are to blend and granulate various SBS, SBR and petroleum resin to prepare the modifier, and the manufacturing process is complex and the cost is high. In terms of use, the most common applications include high-viscosity modified asphalt prepared by TPS modifier imported from Japan and SK high-viscosity modified asphalt imported from Korea, which are expensive and costly.
SBS belongs to weak polar polymer, and develops in petroleum asphalt through shearing swelling, but the process is mechanical melting dispersion and wrapping, no chemical reaction occurs, and phenomena of instability, separation and the like exist to a certain extent in the processes of storage, transportation and use. Meanwhile, the butadiene chain segment in the SBS molecular structure contains C ═ C double bonds, so that the butadiene chain segment is active in chemical property and poor in aging resistance to oxygen, ozone and ultraviolet light. The SBS is modified from the molecular structure, the polarity of the SBS is increased, and the compatibility of the SBS and the asphalt is improved.
Therefore, in view of the development demand of high-quality multifunctional pavements in China and the molecular structure characteristics of the traditional SBS modifier, it is very necessary to develop a modifier which contains a special structure and has stable performance and prepare the corresponding high-viscosity high-elasticity modified asphalt.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides high-viscosity high-elasticity modified asphalt.
The invention also aims to provide a preparation method of the high-viscosity high-elasticity modified asphalt.
The third purpose of the invention is to propose the application of the high-viscosity high-elasticity modified asphalt.
The technical scheme for realizing the above purpose of the invention is as follows:
the high-viscosity high-elasticity modified asphalt is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 6.5-9.5 parts of SBS graft copolymer, 0.5-2 parts of tackifying resin, 0.1-0.35 part of antioxidant, 0.2-1.5 parts of vulcanizing agent and 0.1-1.0 part of compatilizer rubber oil;
the SBS graft copolymer is obtained by graft copolymerization of SBS and a monomer, wherein the monomer is selected from one of Methyl Methacrylate (MMA), Butyl Acrylate (BA), acrylonitrile monomer, Maleic Acid (MA), Maleic Anhydride (MAH), methacrylic acid (MAA) and MMA + BA, and the using amount of the monomer is 25-30% of the mass of SBS.
The tackifying resin is a synthetic petroleum resin or a natural petroleum resin, wherein the synthetic petroleum resin is one of paraffin petroleum resin, dicyclopentadiene resin and aromatic petroleum resin, and the natural petroleum resin is one or more of polyterpene resin, terpene phenol resin, rosin ester and modified rosin ester;
wherein the antioxidant is BHT or 1010, the phenolic antioxidant is one of, and the vulcanizing agent is sulfur, and the sulfide and the sulfur donor are one of. The sulphur donor may be one of morpholine disulphide (DTDM), sulphenamides (e.g. NOBS), Vultac.
Wherein, the SBS is one or two of linear and star-shaped styrene-butadiene-styrene block copolymer.
The SBS elastomer structure is divided into two main types of linear and star. The star-shaped SBS has more complex structure, high cohesive strength, high physical crosslinking density and higher heat resistance and elastic modulus than the linear SBS. However, if the amount of the star SBS is too large, the shrinkage internal stress of the adhesive is increased. Preferably, the SBS is a star-shaped styrene-butadiene-styrene block copolymer.
In the high-viscosity high-elasticity modified asphalt, the SBS graft copolymer is prepared by the following method:
SBS is dissolved in solvent, monomer and initiator are added, copolymerization reaction is carried out for 4-5 h at 70-80 ℃ under the protection of nitrogen or inert gas;
the initiator is Benzoyl Peroxide (BPO) or Azobisisobutyronitrile (AIBN), and the mass fraction of the initiator is 0.8-2.0% based on the mass of SBS.
The invention uses polar monomer to graft and modify SBS, which can destroy double bond in molecule, reduce chemical activity of SBS, and avoid oxidation. The produced SBS graft copolymer has the advantages of increasing the polarity of SBS, improving the compatibility of SBS and asphalt, and combining the characteristics of various high polymers to make the asphalt modification effect very obvious.
Wherein the solvent is one or two of toluene, cyclohexane and 120# solvent oil, the SBS dissolving temperature is 50-60 ℃, and the solvent consumption is 30-40% of the SBS mass.
Further, after copolymerization reaction is carried out for 4-5 hours, the obtained reaction mixture is stirred by using methanol as a precipitator, dissolved and filtered, repeated for 3-5 times, so that unreacted monomers are dissolved by the methanol, graft and associated monomer copolymers are precipitated, after drying and constant weight, the mixture is extracted by using isopropanol (extraction is also called as extraction) to separate homopolymers, binary copolymers and grafts (insoluble substances are the grafts to be obtained) for later use.
The invention also provides a preparation method of the high-viscosity high-elasticity modified asphalt, which comprises the following steps:
the method comprises the following steps: heating the substrate asphalt to 140-150 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 170-180 ℃, adding the SBS graft copolymer while shearing, and uniformly shearing to obtain a mixture;
step two: adding tackifying resin into the mixture obtained in the step one at the temperature of 175-185 ℃ and continuously shearing for 15-30 min, then adding a vulcanizing agent and an antioxidant and continuously shearing for 15-30 min, and after shearing, developing for 1-4 h at the temperature of 175-185 ℃ to obtain the high-viscosity high-elasticity modified asphalt.
The preparation method can obtain the high-viscosity high-elasticity modified asphalt with the dynamic viscosity of not less than 20000 Pa.s at the temperature of 60 ℃.
Preferably, the base asphalt is # 70 base asphalt.
The application of the high-viscosity high-elasticity modified asphalt is applied to the paving, repairing, waterproofing and grouting treatment of expressways, bridge surface roads, stress absorption layers, large-pore drainage road surfaces, airport road surfaces, steel bridge surface paving layers and the like.
The invention has the beneficial effects that:
1. the high-viscosity high-elasticity modified asphalt provided by the invention has good high-temperature stability, low-temperature crack resistance and aging resistance, can replace expensive imported high-viscosity modified asphalt under the condition of not influencing the service performance of the pavement, reduces the construction cost, and can be widely applied to paving domestic high-performance pavements.
2. The characteristic that a butadiene chain segment in the SBS molecular structure contains C-C double bonds is utilized to carry out graft copolymerization on SBS and other polymer monomers, the performance of the modifier is improved from the internal chemical structure, and the aging resistance to oxygen, ozone and ultraviolet light can be effectively realized. The generated SBS graft copolymer increases the polarity of SBS, improves the compatibility of SBS and asphalt, increases the flexibility of SBS and improves the performance of modified asphalt.
3. The modifier in the modified asphalt provided by the invention is stable in preparation, strong in operability and high in cost performance.
4. The high-viscosity modified asphalt is applied to high-durability or special paving roads such as expressways, bridge-deck roads, stress absorbing layers, large-pore drainage pavements, airport pavements, steel bridge pavement pavements, intersections and the like, so that the asphalt mixture has good high-temperature stability, low-temperature crack resistance and scattering resistance, the service performance of the pavements is effectively improved, and the service life of the pavements is prolonged.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the examples, unless otherwise specified, the methods used are conventional in the art.
Example 1
The high-viscosity high-elasticity modified asphalt of the embodiment is prepared from the following raw materials in parts by weight: 100 parts of base asphalt, 9.5 parts of SBS graft copolymer, 0.5 part of tackifying resin modified rosin ester, 10100.2 parts of antioxidant, 1.0 part of sulfur and 0.2 part of compatilizer rubber oil; the SBS is a star-shaped styrene-butadiene-styrene block copolymer and is purchased from Yanshan petrochemical.
The method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the solvent is toluene, SBS and the solvent are placed in a reactor according to the volume ratio of 1:1, after complete dissolution at 60 ℃, a toluene solution of Benzoyl Peroxide (BPO) is added, nitrogen is introduced, stirring is carried out, the temperature is raised to 80 ℃, Methyl Methacrylate (MMA) dissolved with BPO is dropwise added, wherein the total amount of BPO is 0.9% of the mass of SBS, the mass of MMA is 25% of SBS, the temperature is kept for 5h for reaction, and the temperature is reduced to room temperature (the ratio of the first BPO to the second BPO is 1: 1).
Step two: the reaction mixture was stirred with methanol as precipitant, precipitated, washed and filtered, repeatedly pounded and washed 3 times to dissolve unreacted monomer, precipitate graft and associated monomer copolymer, dried to constant weight, and extracted with isopropanol to separate homopolymer, copolymer and graft for future use (the preferred is graft).
Step three: heating the matrix asphalt (70#, the same below) to 150 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 180 ℃, shearing, and simultaneously adding the SBS graft copolymer obtained in the step two until the shear is uniform to obtain a mixture;
step four: adding tackifying resin modified rosin ester into the mixture obtained in the third step at the temperature of 185 ℃ and continuously shearing for 15min, then adding vulcanizing agent sulfur and antioxidant 1010 and continuously shearing for 15min, and after shearing, developing for 2h at the temperature of 185 ℃ to obtain the high-viscosity high-elasticity modified asphalt.
The relevant technical indexes of the high-viscosity modified asphalt prepared in example 1 were tested according to the test method specified in the test procedure for road engineering asphalt and asphalt mixture (JTG E20-2011), and the test results are shown in table 1.
TABLE 1 technical index test results of the high-viscosity high-elasticity modified asphalt prepared in example 1
The comparison objects quoted in the technical requirements of the tables are the SBS modified bitumen (I-D) type specifications. Because the larger the cohesion force is, the larger the surface energy of the asphalt is, the adhesiveness of the asphalt with stone materials is enhanced, and the characteristics of high viscosity and high elasticity are shown.
Example 2
The high-viscosity high-elasticity modified asphalt of the embodiment is prepared from the following raw materials in parts by weight: 100 parts of base asphalt, 6.5 parts of SBS graft copolymer, 2 parts of tackifying resin paraffin petroleum resin, 0.35 part of antioxidant BHT, 0.8 part of sulfur and 0.5 part of compatilizer rubber oil; the SBS is star-shaped styrene-butadiene-styrene block copolymer.
The method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the solvent is cyclohexane, and SBS and the solvent are mixed according to the proportion of 1:1 (the solvent is required to completely dissolve SBS) is placed in a reactor, after complete dissolution at 55 ℃, BPO cyclohexane solution is added, nitrogen is introduced, stirring is carried out, the temperature is raised to 75 ℃, Butyl Acrylate (BA) dissolved with BPO is dripped, wherein the total amount of BPO is 1.0 percent of the mass of SBS, the mass of BA is 30 percent of SBS, the temperature is kept for 4h for reaction, and the temperature is reduced to room temperature.
Step two: stirring the reaction mixture by using methanol as a precipitator, precipitating, cleaning and filtering, repeatedly pounding and washing for 5 times, dissolving unreacted monomers, precipitating a graft and an associated monomer copolymer, drying the graft and the associated monomer copolymer to constant weight, and extracting the dried graft and the monomer copolymer by using isopropanol to separate a homopolymer, a binary copolymer and the graft for later use.
Step three: heating the substrate asphalt to 145 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 175 ℃, and adding the SBS graft copolymer while shearing until the SBS graft copolymer is uniformly sheared to obtain a mixture;
step four: adding tackifying resin paraffin petroleum resin into the mixture obtained in the step one at the temperature of 180 ℃ and continuously shearing for 30min, then adding vulcanizing agent sulfur and antioxidant BHT, continuously shearing for 30min, and developing for 3h at the temperature of 180 ℃ after shearing to obtain the high-viscosity high-elasticity modified asphalt.
The other operations were the same as in example 1.
The relevant technical indexes of the high-viscosity modified asphalt prepared in example 2 were tested, and the test results are shown in table 2.
TABLE 2 technical index test results of the high-viscosity high-elasticity modified asphalt prepared in example 2
| Test items | Unit of | Example 2 | Technical requirements |
| Penetration degree (25 ℃, 100g, 5s) | 0.1mm | 55 | ≥40 |
| Softening point (5 ℃ C.) | ℃ | 95 | ≥80 |
| Ductility (5 ℃ C.) | cm | 44 | ≥20 |
| Rotational viscosity at 170 ℃ | Pa.s | 0.950 | — |
| Dynamic viscosity at 60 DEG C | Pa.s | 49729.3 | ≥20000 |
Example 3
The high-viscosity high-elasticity modified asphalt of the embodiment is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 8 parts of SBS graft copolymer, 1.5 parts of tackifying resin polyterpene resin, 0.3 part of antioxidant BHT, 1.0 part of sulfur donor and 0.8 part of compatilizer rubber oil; the SBS is star-shaped styrene-butadiene-styrene block copolymer.
The method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the solvent is 120# solvent oil, and the SBS and the solvent are mixed according to the proportion of 1:1, placing the mixture in a reactor, after completely dissolving the mixture at 50 ℃, adding Azodiisobutyronitrile (AIBN)120# solvent oil solution, introducing nitrogen, stirring and heating to 70 ℃, dropwise adding methyl Methacrylate (MAA) dissolved with AIBN, wherein the total amount of AIBN is 1.5 percent of the mass of SBS, the mass of MAA is 25 percent of the mass of SBS, keeping the temperature and reacting for 3.5h, and cooling to room temperature.
Step two: stirring the reaction mixture by using methanol as a precipitator, precipitating, cleaning and filtering, repeatedly pounding and washing for 4 times, dissolving unreacted monomers, precipitating a graft and an associated monomer copolymer, drying the graft and the associated monomer copolymer to constant weight, and extracting the dried graft and the monomer copolymer by using isopropanol to separate the homopolymer, the binary copolymer and the graft for later use.
Step three: heating the substrate asphalt to 140 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 170 ℃, shearing, and adding the SBS graft copolymer until the SBS graft copolymer is uniformly sheared to obtain a mixture;
step four: adding a tackifying resin polyterpene resin into the mixture obtained in the step one at the temperature of 175 ℃ and continuously shearing for 20min, then adding a vulcanizing agent sulfur donor, continuously shearing for 20min by using an antioxidant BHT, and developing for 4h at the temperature of 175 ℃ after shearing to obtain the high-viscosity high-elasticity modified asphalt.
The other operations were the same as in example 1.
The relevant technical indexes of the high-viscosity modified asphalt prepared in example 3 were tested, and the test results are shown in table 3.
TABLE 3 technical index test results of the high-viscosity high-elasticity modified asphalt prepared in example 3
The penetration index is used for evaluating the temperature sensitivity performance of asphalt, and the specification requires the penetration index PI to be, so that the experiment is carried out to ensure that the high-viscosity asphalt is more and more comprehensively characterized. The larger the penetration index PI, the less temperature sensitive the bitumen.
Example 4
The high-viscosity high-elasticity modified asphalt of the embodiment is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 7 parts of SBS graft copolymer, 1.0 part of tackifying resin dicyclopentadiene resin, 10100.1 parts of antioxidant, 1.5 parts of sulfur and 1.0 part of compatilizer rubber oil; the SBS is star-shaped styrene-butadiene-styrene block copolymer.
The method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the solvent is 120# solvent oil, SBS and the solvent are placed in a reactor according to the ratio of 1:1, after complete dissolution at 60 ℃, BPO120# solvent oil solution is added, nitrogen is introduced, stirring is carried out, the temperature is raised to 75 ℃, acrylonitrile monomer dissolved with BPO is dripped, wherein the total amount of BPO is 1.0% of the mass of SBS, the mass of acrylonitrile monomer is 30% of SBS, the heat preservation reaction is carried out for 4.5h, and the temperature is reduced to room temperature.
Step two: stirring the reaction mixture by using methanol as a precipitator, precipitating, cleaning and filtering, repeatedly pounding and washing for 3 times, dissolving unreacted monomers, precipitating a graft and an associated monomer copolymer, drying the graft and the associated monomer copolymer to constant weight, and extracting the dried graft and the monomer copolymer by using isopropanol to separate the homopolymer, the binary copolymer and the graft for later use.
Step three: heating the substrate asphalt to 150 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 180 ℃, and then shearing while adding the SBS graft copolymer until the shearing is uniform to obtain a mixture;
step four: adding a tackifying resin dicyclopentadiene resin into the mixture obtained in the step one at the temperature of 185 ℃ and continuously shearing for 25min, then adding sulfur and an antioxidant 1010 and continuously shearing for 25min, and after shearing, developing for 3.5h at the temperature of 185 ℃ to obtain the high-viscosity high-elasticity modified asphalt.
The other operations were the same as in example 1.
Relevant technical indexes of the high-viscosity modified asphalt prepared in example 4 were tested, and the test results are shown in table 4.
TABLE 4 technical index test results of the high-viscosity high-elasticity modified asphalt prepared in example 4
| Test items | Unit of | Example 2 | Technical requirements |
| Penetration degree (25 ℃, 100g, 5s) | 0.1mm | 51 | ≥40 |
| Softening point (5 ℃ C.) | ℃ | 97 | ≥80 |
| Ductility (5 ℃ C.) | cm | 44 | ≥20 |
| Rotational viscosity at 170 ℃ | Pa.s | 0.838 | — |
| Dynamic viscosity at 60 DEG C | Pa.s | 65972.3 | ≥20000 |
Example 5
The high-viscosity high-elasticity modified asphalt of the embodiment is prepared from the following raw materials in parts by weight: 100 parts of matrix asphalt, 9 parts of SBS graft copolymer, 2 parts of tackifying resin aromatic hydrocarbon petroleum resin, 0.25 part of antioxidant BHT, 0.5 part of sulfur and 0.6 part of compatilizer rubber oil; the SBS is star-shaped styrene-butadiene-styrene block copolymer.
The method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the solvent is 120# solvent oil, SBS and the solvent are placed in a reactor according to the ratio of 1:1, after complete dissolution at 55 ℃, the solution of BPO/AIBN mixed monomer is added, nitrogen is introduced, stirring is carried out, the temperature is raised to 75 ℃, MMA/BA mixed monomer dissolved with BPO/AIBN mixed monomer is dropwise added, wherein the total amount of BPO is 2.0% of the mass of SBS, the mass of MMA/BA mixed monomer is 30% of the mass of SBS, the temperature is kept for 5h of reaction, and the temperature is reduced to room temperature.
Step two: stirring the reaction mixture by using methanol as a precipitator, precipitating, cleaning and filtering, repeatedly pounding and washing for 5 times, dissolving unreacted monomers, precipitating a graft and an associated monomer copolymer, drying the graft and the associated monomer copolymer to constant weight, and extracting the dried graft and the monomer copolymer by using isopropanol to separate the homopolymer, the binary copolymer and the graft for later use.
Step three: heating the substrate asphalt to 145 ℃, adding the compatilizer rubber oil, uniformly stirring, heating to 175 ℃, and adding the SBS graft copolymer while shearing until the SBS graft copolymer is uniformly sheared to obtain a mixture;
step four: adding tackifying resin aromatic hydrocarbon petroleum resin into the mixture obtained in the step one at the temperature of 180 ℃ and continuously shearing for 30min, then adding sulfur as a stabilizing agent and BHT (butylated hydroxytoluene) as an antioxidant, continuously shearing for 30min, and developing for 3h at the temperature of 180 ℃ after shearing to obtain the high-viscosity high-elasticity modified asphalt.
The other operations were the same as in example 1.
Relevant technical indexes of the high-viscosity modified asphalt prepared in example 5 were tested, and the test results are shown in table 5.
TABLE 5 technical index test results of the modified asphalt with high viscosity and high elasticity prepared in example 5
| Test items | Unit of | Example 2 | Technical requirements |
| Penetration degree (25 ℃, 100g, 5s) | 0.1mm | 44 | ≥40 |
| Softening point (5 ℃ C.) | ℃ | 104 | ≥80 |
| Ductility (5 ℃ C.) | cm | 37 | ≥20 |
| Rotational viscosity at 170 ℃ | Pa.s | 1.006 | — |
| Dynamic viscosity at 60 DEG C | Pa.s | 231185.0 | ≥20000 |
Although the present invention has been described in the foregoing by way of examples, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (2)
1. The high-viscosity high-elasticity modified asphalt is characterized by being prepared from the following raw materials in parts by weight: 100 parts of base asphalt, 9.5 parts of SBS graft copolymer, 0.5 part of tackifying resin modified rosin ester, 10100.2 parts of antioxidant, 1.0 part of sulfur and 0.2 part of compatilizer rubber oil; the SBS is a star-shaped styrene-butadiene-styrene block copolymer and is purchased from Yanshan petrochemical;
the method for preparing the high-viscosity high-elasticity modified asphalt comprises the following steps:
the method comprises the following steps: the method comprises the following steps of putting SBS and a solvent into a reactor according to the volume ratio of 1:1, adding a toluene solution of Benzoyl Peroxide (BPO) after completely dissolving the SBS and the solvent at 60 ℃, introducing nitrogen, stirring, heating to 80 ℃, dropwise adding Methyl Methacrylate (MMA) dissolved with the BPO, wherein the total amount of the BPO is 0.9% of the mass of the SBS, the mass of the MMA is 25% of the mass of the SBS, carrying out heat preservation reaction for 5 hours, and cooling to room temperature, wherein the ratio of the first BPO to the second BPO is 1: 1;
step two: stirring the reaction mixture by using methanol as a precipitator, precipitating, cleaning and filtering, repeatedly pounding and washing for 3 times, dissolving unreacted monomers, precipitating a graft and an associated monomer copolymer, drying the graft and the associated monomer copolymer to constant weight, and extracting the dried graft and the monomer copolymer by using isopropanol to separate a homopolymer, a binary copolymer and the graft for later use;
step three: heating No. 70 matrix asphalt to 150 ℃, adding compatilizer rubber oil, uniformly stirring, heating to 180 ℃, and adding the SBS graft copolymer obtained in the step two while shearing until the mixture is uniformly sheared to obtain a mixture;
step four: adding tackifying resin modified rosin ester into the mixture obtained in the third step at the temperature of 185 ℃ and continuously shearing for 15min, then adding vulcanizing agent sulfur and antioxidant 1010 and continuously shearing for 15min, and after shearing, developing for 2h at the temperature of 185 ℃ to obtain the high-viscosity high-elasticity modified asphalt.
2. The use of the high-viscosity high-elasticity modified asphalt according to claim 1, wherein the asphalt is used for paving, repairing, waterproofing and grouting treatment of expressways, bridge pavements, stress absorption layers, large-pore drainage pavements, airport pavements, steel bridge pavement and the like.
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