CN115678298A - Composite modified asphalt with high coal-based superhard asphalt mixing amount and preparation method thereof - Google Patents
Composite modified asphalt with high coal-based superhard asphalt mixing amount and preparation method thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 178
- 239000003245 coal Substances 0.000 title claims abstract description 68
- 238000002156 mixing Methods 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
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- 239000003431 cross linking reagent Substances 0.000 claims abstract description 30
- 238000010008 shearing Methods 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000003208 petroleum Substances 0.000 claims abstract description 17
- 239000003607 modifier Substances 0.000 claims abstract description 13
- 229920000642 polymer Polymers 0.000 claims abstract description 10
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses composite modified asphalt with high coal-based superhard asphalt mixing amount and a preparation method thereof, belonging to the field of road engineering. The preparation method of the composite modified asphalt comprises the following steps: s1, mixing coal-based ultra-hard asphalt with a proper amount of soft component oil, and heating and dissolving to obtain a mixed liquid material I; s2, mixing the polymer modifier with the balance of soft component oil, and heating and swelling to obtain a mixed liquid material II; and S3, mixing the mixed liquid material I and the mixed liquid material II with the road petroleum asphalt, adding the cross-linking agent I, the cross-linking agent II and the warm mixing agent after high-speed shearing, and stirring and developing to obtain the composite modified asphalt. Compared with the prior art, the composite modified asphalt saves cost and reduces engineering cost on the basis of developing high-quality asphalt cement, and simultaneously realizes large-scale application of coal-based chemical solid wastes in the field of roads.
Description
Technical Field
The invention relates to the field of road engineering, in particular to composite modified asphalt with high coal-based superhard asphalt mixing amount and a preparation method thereof.
Background
At present, the direct coal liquefaction technology is well developed due to high conversion rate and low cost. In addition to gasoline, diesel oil and the like, 30% of direct liquefaction residues are generated in the running process, and if the residues are not treated well, the residues have great adverse effects on the ecological environment and the sustainable development of coal-to-liquid. In the prior art, coal hydrogenation catalysis is performed for clean reaction, and the obtained direct liquefaction residue is subjected to distillation and refining to obtain the superhard asphalt through physical processing, so that high value-added conversion of wastes is realized.
Experts and scholars at home and abroad make a great deal of research on the structure and properties of the coal-based clean super-hard asphalt. Researches show that the types and the contents of aromatic hydrocarbons in the coal-based clean super-hard asphalt are far higher than those of other compounds, the coal-based clean super-hard asphalt mainly comprises nonpolar organic matters such as polycyclic aromatic hydrocarbons containing 4-7 aromatic rings, and the like, and the macromolecular condensed aromatic rings are considered as the main components of the residue macromolecular structural units. The structure of the polycyclic aromatic hydrocarbons has larger polarity, can effectively improve the adhesion of asphalt and aggregate, and provides a good foundation for the use of the polycyclic aromatic hydrocarbons as a road modifier.
However, the coal-based ultra-hard asphalt mainly comprises three parts, namely a part of coal which does not participate in hydrogenation reaction, a hydrogenation liquefaction catalyst and coal-based asphalt. On one hand, the content of chlorotrifluoroethylene insoluble substances is larger due to the fact that the modified asphalt contains a certain proportion of inorganic substances, and the modified asphalt is incompatible with asphalt in a modified asphalt system and is easy to generate phase separation. On the other hand, the coal-based super-hard asphalt has complex components and small mutual acting force, so that the acting force between coal-based super-hard asphalt molecules and petroleum asphalt molecules is small. These greatly limit the blending proportion of the coal-based ultra-hard asphalt in the modified asphalt.
In addition, the viscosity of the composite modified asphalt product prepared from the coal-based ultra-hard asphalt and other modifiers is large, the construction temperature is often higher than 180 ℃, the energy consumption is high, and the problem of asphalt aging is easy to occur.
Disclosure of Invention
The technical task of the invention is to provide a preparation method of composite modified asphalt with high coal-based superhard asphalt mixing amount aiming at the defects of the prior art, and the composite modified asphalt prepared by the method has the characteristics of low cost, high and low temperature performance, good storage stability, warm mixing effect and the like.
The invention further aims to provide the composite modified asphalt with the high coal-based superhard asphalt mixing amount.
The technical task of the invention is realized by the following modes: the preparation method of the composite modified asphalt with high coal-based superhard asphalt mixing amount comprises the following steps:
s1, mixing coal-based ultra-hard asphalt with a proper amount of soft component oil, and heating and dissolving to obtain a mixed liquid material I;
s2, mixing the polymer modifier with the balance of soft component oil, and heating and swelling to obtain a mixed liquid material II;
s3, mixing the mixed liquid material I and the mixed liquid material II with the road petroleum asphalt, adding the cross-linking agent I, the cross-linking agent II and the warm mixing agent after high-speed shearing, stirring and developing to obtain the composite modified asphalt,
the weight ratio of each material is as follows:
the first crosslinking agent is an M rubber accelerator, sulfur and/or M rubber accelerator residues;
and the second crosslinking agent is epoxy silicone oil and/or epoxy-terminated silicone oil.
The composite modified asphalt of the invention preferably comprises the following materials in parts by weight:
the weight ratio of each material of the composite modified asphalt is particularly preferably as follows:
the road petroleum asphalt can be any standard asphalt or non-standard asphalt with the penetration degree of 50-120 dmm, such as 70# road petroleum asphalt, 90# road petroleum asphalt and the like.
The coal-based superhard asphalt is an asphalt substance obtained by directly liquefying and hydrogenating raw coal, and preferably has the penetration degree of less than or equal to 5dmm, the softening point of 150-190 ℃, the relative density of 1.250-1.55 at 25 ℃, the flash point of greater than or equal to 260 ℃, the ash content of less than or equal to 25 percent and the content of trichloroethylene insoluble substances of less than or equal to 60 percent.
Preferably, the coal-based super-hard asphalt is mechanically crushed to be not less than 600 meshes. The crushing can be carried out by ball mill type grinding equipment with a refrigeration system or special grinding equipment based on a cyclone screening principle.
Preferably, the polymer modifier is waste plastic, styrene-butadiene-styrene block copolymer, polyethylene-styrene-polyethylene copolymerized thermoplastic elastomer and/or waste silica gel product, and the addition of a proper amount of polymer modifier can improve the self-adhesive force of the modified asphalt and improve the low-temperature performance.
Preferably, the soft component oil is furfural extract oil, waste heat conduction oil and/or kitchen waste recovered oil, the content of aromatic hydrocarbon is not less than 60%, the solubility in trichloroethylene is not less than 99.5%, no 0.6mm sieve residue is left, the soft component oil is used for adjusting the content of four components of the modified asphalt and plays a role in softening an additive in the asphalt.
Preferably, the warm-mixing agent is an organic viscosity-reducing warm-mixing agent, such as one or a mixture of several of Sasobit, sasoflex, EC120, HY-6500 and WL-115, and further preferably HY-6500 and/or WL-115.
Preferably, the preparation method of the composite modified asphalt comprises the following steps:
s1, mixing coal-based ultra-hard asphalt with a proper amount of soft component oil, and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material I;
s2, mixing the polymer modifier with the balance of soft component oil, and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material II;
s3, mixing the mixed liquid material I and the mixed liquid material II with the road petroleum asphalt, stirring at 160-180 ℃ until the mixture is uniformly mixed, and shearing at 160-180 ℃ by using a shearing machine at a rotating speed of more than 4000RPM for 0.4-0.8h; after shearing, adding the cross-linking agent I, the cross-linking agent II and a warm mixing agent, and stirring and developing for 1-3h at the temperature of 160-180 ℃ to obtain the composite modified asphalt.
Preferably, the composite modified asphalt prepared by the method of the invention meets the following index requirements:
compared with the prior art, the composite modified asphalt with high coal-based superhard asphalt mixing amount and the preparation method thereof have the following outstanding beneficial effects:
the composite modified asphalt prepared by the method has high and low temperature performances, has good high-temperature anti-rutting and low-temperature anti-cracking capabilities, and solves the problem of poor low-temperature performance of a modified product when coal-based superhard asphalt is singly modified; meanwhile, the self-bonding capability of the modified asphalt is greatly improved, and the high-temperature performance of the modified asphalt product is further improved. The PG high-temperature grade of the composite modified asphalt can reach PG88 and above, and the PG low-temperature grade can reach PG22 and below, so that the performance index of the composite modified asphalt can be suitable for asphalt mixtures of various grading types such as AC, SMA, EME and the like, and the technical requirements of different structural layers of a pavement are met;
and (II) the particle size of coal-based super-hard asphalt particles is controlled, the production step of pre-stirring coal-based super-hard asphalt and soft component oil is added in the production process, and the two crosslinking agents are matched for use, so that the problem that the high-content coal-based super-hard asphalt modified asphalt is not suitable for storage is solved while the excellent performance of the modified asphalt is ensured, the storage stability of the composite modified asphalt is effectively improved, the long-term storage can be realized, and the segregation phenomenon is avoided.
And thirdly, the composite modified asphalt prepared by the method has a warm mixing function, and the construction temperature of the composite modified asphalt can be effectively reduced by 15-30 ℃. In addition, the carbon black can effectively improve the ultraviolet aging resistance of the asphalt, and the coal-based superhard asphalt as a coal-based material contains a large amount of carbon black, so that the coal-based modified asphalt can be concluded to have good ultraviolet aging resistance.
And (IV) compared with the SBS modified asphalt with the same SBS mixing amount, the production time can be saved by 1-1.5h by adopting the method for preparing the composite modified asphalt. The energy consumption is reduced, raw materials can be timely provided for pavement construction, and the method has obvious economic benefit.
The invention realizes the high yield and the high proportion ratio of the coal-based superhard asphalt, improves the utilization rate of the coal-based superhard asphalt, consumes a large amount of coal liquefaction residues, effectively lightens the environmental pollution, saves energy, reduces carbon and is environment-friendly.
The invention can save cost and reduce construction cost on the basis of developing high-quality asphalt cement. Particularly, in recent years, the price of petroleum asphalt products is greatly increased, the construction cost is further increased, and the economic advantage of the invention is more remarkable. Meanwhile, the large-scale application of the coal-based chemical solid wastes in the field of roads is realized, a large amount of solid waste residues are consumed, the environmental pollution is effectively reduced, the development of the coal-based product industry is driven, and the purposes of energy conservation, carbon reduction, green environmental protection are really realized.
Drawings
FIG. 1 is a flow chart of the preparation of the composite modified asphalt of the example.
Detailed Description
The composite modified asphalt with high coal-based ultra-hard asphalt mixing amount and the preparation method thereof according to the present invention are described in detail below with reference to the attached drawings.
[ description of main raw materials in examples ]
(1) Road petroleum asphalt: the actual measurement indexes of the No. 70 road petroleum asphalt are as follows:
| detecting items | Unit of | Measured value |
| Penetration (25 ℃,100g, 5s) | 0.1mm | 65 |
| Softening point | ℃ | 46 |
| Ductility at 10 DEG C | cm | 34 |
| Flash point | ℃ | 272 |
| Solubility in water | ％ | 99.9 |
(2) The actual measurement indexes of the coal-based super-hard asphalt are as follows:
| detecting items | Unit | Measured value |
| Penetration (25 ℃,100g, 5s) | 0.1mm | 2 |
| Softening point | ℃ | 170 |
| Ductility at 10 DEG C | cm | 0 |
| Relative density at 25 deg.C | / | 1.35 |
| Ash content | ％ | 13 |
| Content of trichloroethylene insoluble matter | ％ | 55 |
| Particle size | Eyes of a user | 600 |
(3) Soft component oil: the actual measurement indexes of the furfural extract oil are as follows:
| detecting items | Unit of | Measured value |
| Aromatic content | ％ | 65 |
| Flash point | ℃ | 228 |
| 0.6mm screen residue | ％ | Is free of |
| Solubility of trichloroethylene | ％ | 99.9 |
[ EXAMPLES one ]
As shown in the attached figure 1, the preparation process of the composite modified asphalt comprises the following steps:
s1, mixing coal-based ultra-hard asphalt and a proper amount of soft component oil (10-90%), and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material I;
s2, mixing the polymer modifier with the balance of soft component oil (90-10%), and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material II;
s3, mixing the mixed liquid material I and the mixed liquid material II with the road petroleum asphalt, stirring at 160-180 ℃ until the mixture is uniformly mixed, and shearing for 0.4-0.8h at 160-180 ℃ and at the rotating speed of more than 4000RPM by using a shearing machine; after shearing, adding the cross-linking agent I, the cross-linking agent II and a warm mixing agent, and stirring and developing at the temperature of 160-180 ℃ for 1.5-3h to obtain a finished product of the composite modified asphalt.
[ example two ]
The method for preparing the composite modified asphalt comprises the following steps:
(1) Material preparation phase
8Kg of coal-based superhard asphalt powder crushed to 600 meshes is mixed with 1Kg of soft component oil, and the mixture is stirred for 30min at the temperature of 170 +/-5 ℃ to obtain a first mixed liquid material.
Mixing 3Kg of 1301SBS with 1Kg of soft component oil, and stirring at 170 +/-5 ℃ for 15min to obtain a second mixed liquid material.
(2) Asphalt mixing and shearing stage
Stirring and mixing the mixed liquid material I, the mixed liquid material II and 100Kg70# asphalt at the temperature of 175 +/-5 ℃, and stirring uniformly; and shearing the mixture for 0.5h at the temperature of 175 +/-5 ℃ and at the speed of 4500RPM by using a shearing machine.
(3) Stage of asphalt development
After shearing, 0.15Kg of cross-linking agent I (m rubber accelerator), 0.2Kg of cross-linking agent II (epoxy-terminated silicone oil), and 3.0Kg of warm-mixing agent (HY-6500) are added into the mixed system, and stirred and developed for 1h at the temperature of 175 +/-5 ℃ to obtain the composite modified asphalt.
Comparative example 2.1
Preparing the composite modified asphalt by a conventional process:
(1) 8Kg of coal-based superhard asphalt is heated and melted, and then sheared with 2Kg of soft component oil, 3Kg1301 SBS and 100Kg of 70# asphalt by a shearing machine under the conditions of 170 +/-5 ℃ and 4000RPM for 0.5h.
(2) After shearing, 0.15Kg of cross-linking agent I (rubber accelerator), 0.2Kg of cross-linking agent II (epoxy-terminated silicone oil) and 3.0Kg of warm-mixing agent (EC 120) are added into the mixed system, and stirred and developed for 1h at the temperature of 175 +/-5 ℃ to obtain the composite modified asphalt.
Comparative example 2.2
The difference from the second example is that no warm-mixing agent is added in the preparation process.
And (3) performance detection:
the performance index detection data of the composite modified asphalt obtained in the second example, the comparative example 2.1 and the comparative example 2.2 are shown in the following table:
and (3) detecting the construction temperature:
a rotary compaction test is adopted to form a mixture test piece, the volume index of the mixture at different temperatures is determined, and further the construction temperature of the modified asphalt is determined, and the following table shows that:
| mixing temperature | Temperature of compaction | |
| EXAMPLE two samples | 159 | 146 |
| Comparative example 2.1 sample | 160 | 150 |
| Comparative example 2.2 sample | 183 | 172 |
In the conventional process for producing coal-based ultra-hard asphalt modified asphalt, one of the mixing modes of the coal-based ultra-hard asphalt and the petroleum asphalt is to directly heat and melt the coal-based ultra-hard asphalt and then mix the coal-based ultra-hard asphalt with the petroleum asphalt for subsequent processing. As can be seen from the second example and the detection data of the related comparative example, compared with the composite modified asphalt prepared by the conventional process, the composite modified asphalt prepared by the method has the advantages of no sediment generation, stable performance and good storage stability; and the production process is simple and easy to operate, the equipment load cannot be increased, and the service life of the equipment is prolonged.
[ EXAMPLE III ]
(1) Material preparation phase
12Kg of coal-based super-hard asphalt powder crushed to 600 meshes is mixed with 1.5Kg of soft component oil, and stirred for 30min at 170 +/-5 ℃ to obtain a mixed liquid material I.
5Kg of 1301SBS was mixed with 1.0Kg of soft component oil and stirred at 170 ℃ plus or minus 5 ℃ for 15min to obtain a second liquid mixture.
(2) Asphalt mixing and shearing stage
Stirring and mixing the mixed liquid material I, the mixed liquid material II and 100Kg70# asphalt at the temperature of 175 +/-5 ℃, and stirring uniformly; and shearing with shearing machine at 175 deg.C + -5 deg.C and 4500RPM for 0.5h.
(3) Stage of asphalt development
After shearing, 0.25Kg of cross-linking agent I (m rubber accelerator), 0.3Kg of cross-linking agent II (epoxy-terminated silicone oil) and 4.0Kg of warm-mix agent HY-6500 are added into the asphalt and stirred and developed for 1.5h at 175 +/-5 ℃ to obtain the composite modified asphalt.
Comparative example 3.1
(1) 12Kg of coal-based superhard asphalt is crushed to 600 meshes, and sheared with 2.5Kg of soft component oil, 5Kg of 1301SBS and 100Kg of 70# asphalt directly by a shearing machine under the conditions of 170 +/-5 ℃ and 4500RPM for 0.5h.
(2) After shearing, 0.25Kg of cross-linking agent I (rubber accelerator), 0.3Kg of cross-linking agent II (epoxy-terminated silicone oil) and 4.0Kg of warm-mix agent are added into the asphalt and stirred and developed for 1.5h at 175 +/-5 ℃ to obtain the composite modified asphalt.
Comparative example 3.2
The difference from the third example is that the coal-based ultra-hard asphalt is crushed to 80 meshes in the preparation process.
Comparative example 3.3
The difference from the third example is that no warm-mixing agent is added in the preparation process.
And (3) performance detection:
the performance index detection data of the composite modified asphalt obtained in the third example, the third comparative example 3.1, the third comparative example 3.2 and the third comparative example 3.3 are shown in the following table:
and (3) detecting the construction temperature:
a rotary compaction test is adopted to form a mixture test piece, the volume index of the mixture at different temperatures is determined, and further the construction temperature of the modified asphalt is determined, and the following table shows that:
| mixing temperature | Temperature of compaction | |
| EXAMPLE three samples | 163 | 149 |
| Comparative example 3.1 sample | 165 | 152 |
| Comparative example 3.2 sample | 165 | 150 |
| Comparative example 3.2 sample | 189 | 176 |
In the preparation process of the conventional modified asphalt, various raw materials are directly sheared; in addition, if the modifier needs to be crushed, the particle size is more than 80 meshes. As can be seen from the third example and the relevant comparative example detection data, compared with the composite modified asphalt prepared by the conventional process, the composite modified asphalt prepared by the method of the invention has no sediment in the production process and has good storage stability. If the step of material preparation stage is abandoned in the processing process and the raw materials are directly sheared (see comparative example 3.1), the prepared modified asphalt product has more precipitates and poor storage stability after being placed for 2 days. If the coal-based super-hard asphalt is not thoroughly crushed, the particle size becomes larger, as in comparative example 3.2, resulting in poor storage stability of the modified asphalt product.
[ EXAMPLE IV ]
(1) Material preparation phase
15Kg of coal-based superhard asphalt powder crushed to 600 meshes is mixed with 2.5Kg of soft component oil and stirred for 30min at 170 +/-5 ℃ to obtain a first mixed liquid material.
3Kg of 1301SBS and 3Kg of waste mulch film were mixed with 2Kg of soft component oil and stirred at 170 ℃ C. + -. 5 ℃ for 15min to obtain the second mixed liquid material.
(2) Asphalt mixing and shearing stage
Stirring and mixing the mixed liquid material I, the mixed liquid material II and 100Kg70# asphalt at the temperature of 175 +/-5 ℃, and stirring uniformly; and shearing with shearing machine at 175 deg.C + -5 deg.C and 4500RPM for 0.5h.
(3) Stage of asphalt development
After shearing, 0.25Kg of cross-linking agent I (rubber accelerator), 0.35Kg of cross-linking agent II (epoxy-terminated silicone oil) and 4.0Kg of warm-mixing agent HY-6500 are added into the asphalt and stirred and developed for 1.5h at 175 +/-5 ℃ to obtain the composite modified asphalt.
Comparative example 4.1
The only difference from example four is that 2 crosslinkers were used in example four and only one crosslinker was used in comparative example 4.1 during the preparation.
And (3) performance detection:
the performance index detection data of the composite modified asphalt obtained in the fourth example and the comparative example 4.1 are shown in the following table:
and (3) detecting the construction temperature:
a rotary compaction test is adopted to form a mixture test piece, the volume index of the mixture at different temperatures is determined, and further the construction temperature of the modified asphalt is determined, and the following table shows that:
| mixing temperature | Temperature of compaction | |
| EXAMPLE four samples | 165 | 152 |
| Comparative example 4.1 | 160 | 148 |
The cross-linking agent I (the rubber accelerator) plays a role in a modified asphalt system, and mainly promotes the cross-linking of a polymer modifier SBS to form a net structure, so that the high-temperature stability and the storage stability of a product are improved; and the second crosslinking agent (end epoxy silicone oil) mainly plays a role in bridging between the road petroleum asphalt and the coal-based asphalt, strengthens the interaction between the coal-based superhard asphalt and the petroleum asphalt, reduces the particle settling rate and further improves the stability of the modified asphalt. Compared with the single use of the m rubber accelerator, the two crosslinking agents are used in a matching way, so that the stability of the product can be obviously improved.
Claims (9)
1. The preparation method of the composite modified asphalt with high coal-based superhard asphalt mixing amount is characterized by comprising the following steps:
s1, mixing coal-based ultra-hard asphalt with a proper amount of soft component oil, and heating and dissolving to obtain a mixed liquid material I;
s2, mixing the polymer modifier with the balance of soft component oil, and heating and swelling to obtain a mixed liquid material II;
s3, mixing the mixed liquid material I and the mixed liquid material II with the road petroleum asphalt, adding the cross-linking agent I, the cross-linking agent II and a warm mixing agent after high-speed shearing, stirring and developing to obtain the composite modified asphalt,
the weight ratio of each material is as follows:
the first crosslinking agent is an M rubber accelerator, sulfur and/or M rubber accelerator residues;
and the second crosslinking agent is epoxy silicone oil and/or epoxy-terminated silicone oil.
2. The preparation method of the composite modified asphalt with high coal-based superhard asphalt mixing amount according to claim 1 is characterized by comprising the following steps:
the weight ratio of each material is as follows:
3. the preparation method of the composite modified asphalt with high coal-based ultra-hard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps: the coal-based superhard asphalt is an asphalt substance obtained by directly liquefying and hydrogenating raw coal, the penetration degree is less than or equal to 5dmm, the softening point is 150-190 ℃, the relative density at 25 ℃ is 1.250-1.55, the flash point is greater than or equal to 260 ℃, the ash content is less than or equal to 25 percent, and the content of trichloroethylene insoluble substances is less than or equal to 60 percent.
4. The preparation method of the composite modified asphalt with high coal-based ultra-hard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps: the coal-based super-hard asphalt is mechanically crushed to be not less than 600 meshes.
5. The preparation method of the composite modified asphalt with high coal-based ultra-hard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps: the polymer modifier is waste plastic, polyethylene-styrene-polyethylene copolymerized thermoplastic elastomer and/or waste silica gel product.
6. The preparation method of the composite modified asphalt with high coal-based ultra-hard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps: the soft component oil is furfural extract oil, waste heat conduction oil and/or kitchen waste recovered oil, the content of aromatic hydrocarbon is not less than 60%, the solubility in trichloroethylene is not less than 99.5%, and no 0.6mm sieve residue is generated.
7. The preparation method of the composite modified asphalt with high coal-based superhard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps: the warm mixing agent is an organic viscosity-reducing warm mixing agent.
8. The preparation method of the composite modified asphalt with high coal-based superhard asphalt mixing amount according to claim 1 or 2, which is characterized by comprising the following steps:
mixing coal-based super-hard asphalt with a proper amount of soft component oil, and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material I;
mixing the polymer modifier with the rest of the soft component oil, and stirring at 160-180 ℃ for 0.5-1h to obtain a mixed liquid material II;
mixing the first mixed liquid material, the second mixed liquid material and the road petroleum asphalt, stirring at 160-180 ℃ until the mixture is uniformly mixed, and shearing by using a shearing machine at 160-180 ℃ at a rotating speed of more than 4000RPM for 0.4-0.8h; after shearing, adding the cross-linking agent I, the cross-linking agent II and a warm mixing agent, and stirring and developing for 1-3h at the temperature of 160-180 ℃ to obtain the composite modified asphalt.
9. The composite modified asphalt with high coal-based ultra-hard asphalt mixing amount obtained by the preparation method of any one of claims 1 to 8.
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