CN116426135A - A kind of composite modified high-viscosity asphalt and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of road material modified asphalt, and provides composite modified high-viscosity asphalt which comprises the following raw materials in parts by weight: 70.0% of sk90 matrix asphalt, 18.5% of waste rubber powder, 2.0% of acrylonitrile-butadiene-styrene copolymer, 1.7% of polycaprolactone, 1.2% of benzyl glycidyl ether 692, 0.7% of dicyclopentadiene, 0.9% of POE DF840, 3.0% of viscosity reducer and 2.0% of adhesion promoter. The result of a great deal of research and experiments shows that the modified asphalt produced by the invention is applied to the pavement of asphalt pavement, can obviously improve the high-temperature stability and construction workability of the pavement, improves the poor low-temperature performance of rubber asphalt to a certain extent, reduces the cost of overall engineering, and has better economic benefit and environmental benefit.

Description

A kind of composite modified high-viscosity asphalt and preparation method thereof

technical field

The invention relates to the technical field of road material modified asphalt, in particular to a composite modified high-viscosity asphalt and a preparation method thereof.

Background technique

With the gradual advancement of sponge city construction, the paved area of drainage pavement is increasing, and the demand for drainage asphalt mixture is growing rapidly. Drainage asphalt mixture has large voids and many interconnected voids, so the requirements for the adhesion and anti-aging performance of asphalt binder are extremely high. It is estimated that the output of waste tires in my country will be close to 20 million tons by the end of 2020. With the large amount of discarding and accumulation of waste tires, serious environmental pollution and waste of resources have been caused. The rubber-asphalt produced by grinding waste tires into asphalt has good high temperature resistance, aging resistance and durability, and shows good road performance. At the same time, due to its good economic benefits and Environmental benefits have gradually attracted widespread attention from industry insiders. Traditional high-viscosity asphalt has high cost and weak anti-aging ability. At the same time, because waste tire rubber powder is an inert material, it has poor compatibility with asphalt, which will limit the use performance of rubber-asphalt. Because its viscosity is too high, it will cause the mixing temperature of the mixture to be too high, further increasing the The construction is difficult, and the thermo-oxidative aging of asphalt is accelerated, causing excessive consumption of energy.

Therefore, it is of great significance to study how to reduce the cost of high-viscosity modified asphalt and increase its compatibility with asphalt. At the same time, reducing the viscosity of rubber-asphalt can increase the ease of construction and reduce energy consumption. Based on this, the present invention will provide a high-viscosity composite modified asphalt prepared with waste rubber powder as the main material, which has the advantages of low cost, resource recycling, high viscosity, and strong anti-aging ability.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a composite modified high-viscosity asphalt which has the advantages of low cost, resource recycling, high viscosity, strong anti-aging ability, good construction workability, etc. Asphalt aging ensures the high and low temperature performance of the asphalt pavement in the later period of use and improves the service life of the asphalt pavement. The present invention adopts following technical scheme to realize:

A kind of composite modified high-viscosity asphalt, its preparation raw material comprises:

SK90 base asphalt, waste rubber powder, acrylonitrile-butadiene-styrene copolymer, polycaprolactone, benzyl glycidyl ether 692, dicyclopentadiene and POE DF840, viscosity reducer, adhesion promoter.

In a preferred scheme, the raw materials for its preparation include 65.8% to 70.6% of sk90 base asphalt, 18.0% to 20.0% of waste rubber powder, and 1.7% to 2.5% of acrylonitrile-butadiene-styrene copolymer in terms of weight fraction. %, polycaprolactone is 1.5% to 2.0%, benzyl glycidyl ether 692 is 1.0% to 1.5%, dicyclopentadiene is 0.5% to 1.0%, POEDF840 is 0.7% to 1.0%, and viscosity reducer is 3.0% %～5.0%, adhesion promoter 2.0%～3.0%.

In the preferred scheme, the raw materials for its preparation include 70.0% of sk90 base asphalt, 18.5% of waste rubber powder, 2.0% of acrylonitrile-butadiene-styrene copolymer, and 1.7% of polycaprolactone in terms of weight fraction. , benzyl glycidyl ether 692 is 1.2%, dicyclopentadiene is 0.7%, POE DF840 is 0.9%, viscosity reducer is 3.0%, and adhesion promoter is 2.0%.

In the preferred scheme, the viscosity reducer adopts the anionic surfactant N-oleoyl N-methyl taurate sodium to organically modify the montmorillonite, and then under the condition of potassium persulfate as the initiator, select Three monomers, maleic anhydride, acrylamide and methyl vinyl polyoxyethylene ether, are grafted to form a composite viscosity reducer of nano-montmorillonite and polymer.

In a preferred solution, the viscosity reducer is prepared by mixing the following raw materials in parts by weight: 3.0% to 5.0% of the anionic surfactant N-oleoyl N-methyl taurate sodium, montmorillonite Soil is 45.6% to 50.8%, potassium persulfate is 3.0% to 4.0%, maleic anhydride is 15.6% to 18.8%, acrylamide is 12.6% to 14.8%, methyl alkenyl polyoxyethylene ether is 10.2% to 11.4% %.

In a preferred solution, the viscosity reducer is composed of the following raw materials in parts by weight: the anionic surfactant N-oleoyl N-methyl taurate is 4.0%, and the montmorillonite is 48.6%. %, potassium persulfate is 3.5%, maleic anhydride is 18.6%, acrylamide is 13.9%, and methyl alkenyl polyoxyethylene ether is 11.4%. The sum of the parts by weight of raw materials is 100%.

In a preferred solution, the adhesion promoter is composed of the following raw materials in parts by weight: chlorinated polyolefin, alkoxy functional silane oligomer, and BH-403 epoxy resin.

In a preferred solution, the adhesion promoter is composed of the following raw materials in parts by weight: 18% to 20% of chlorinated polyolefin, 25% to 30% of alkoxy functional silane oligomer, BH- 403 epoxy resin 45% to 50%.

In a preferred solution, the adhesion promoter, in parts by weight, is composed of the following raw materials: chlorinated polyolefin 20%, alkoxy functional group silane oligomer 30%, BH-403 epoxy resin 50% %.

A preparation method of composite modified high-viscosity asphalt, the method is carried out according to the following steps:

S1: First, add montmorillonite and absolute ethanol into the reaction flask according to the mass ratio of 1:20, place it in a constant temperature water bath at 80°C, and stir at a high speed of 4000r/min for 1h under ultrasonic conditions; use a certain amount of Dissolve the N-oleoyl N-methyl taurate sodium surfactant in absolute ethanol and add it to the reaction flask, continue ultrasonication and high-speed stirring for 2 hours; The AgNO3 solution of L was detected until there was no Cl-; the product was dried in a vacuum oven at 100°C for 36 hours; after grinding and sieving, the organically modified montmorillonite was obtained, that is, a uniform mixture A;

S2: Add maleic anhydride, acrylamide, methyl alkenyl polyoxyethylene ether and mixture A to a three-necked flask with a dropping funnel, a stirrer and a thermometer; heat the reaction mixture to the reaction temperature, and pass through the dropping funnel Add in potassium persulfate, and at the same time add and react for a predetermined time under nitrogen protection, and cool to room temperature; wash the reactant cooled to room temperature with ethanol repeatedly, and then vacuum-dry the precipitate at room temperature to obtain the final purified product; change three According to the amount of monomers, composite viscosity reducers of nano-montmorillonite and polymers with different grafting ratios were obtained, i.e. mixture B;

S3: Chlorinated polyolefin, alkoxy functional group silane oligomer, BH-403 epoxy resin, mixed according to the ratio of 2:3:5 to take a certain amount of chlorinated polyolefin, alkoxy functional group silane oligomer, Pour BH-403 epoxy resin into a 100ml beaker, then put the beaker containing the mixture into the DF-101S constant temperature oil bath (produced by Yuhua Instrument) heated to 80°C for rapid heating, and start stirring, the stirring speed It must be slowly increased from slow to fast to the set reaction rate of 2500r/min, and after waiting for the mixture to react for 60 minutes, the organic modification of montmorillonite is completed, and a uniform mixture C is obtained;

S4: Preheat the sk90 base asphalt in an oven to 185°C, add mixture B and mixture C, stir at 180°C for 90 minutes at high speed, and then add acrylonitrile-butadiene-styrene copolymer grafted malay Acid anhydride, polycaprolactone, benzyl glycidyl ether 692, dicyclopentadiene and POE DF840 were stirred with an electric mixer at 3000r/min for 30min at 180°C to obtain modified asphalt.

The beneficial effects achieved by the present invention are:

1. Rubber asphalt has the advantages of low cost, resource recycling, high viscosity, and strong anti-aging ability. The invention adds waste rubber powder to the asphalt, which can greatly increase the viscosity of the asphalt material, improve its volume deformation caused by temperature changes, improve crack resistance, and reduce engineering costs and later road maintenance costs.

2. The inventive method proposes to adopt the anionic surfactant N-oleoyl N-methyl taurate sodium to carry out organic modification to montmorillonite, and then under the condition of potassium persulfate as initiator, select Malay Acid anhydride, acrylamide and methyl vinyl polyoxyethylene ether are grafted to form a composite viscosity reducer of nanometer montmorillonite and polymer. Adding this viscosity reducer to rubber asphalt can properly reduce the viscosity of the asphalt, thereby reducing the difficulty of construction, which is of great significance for saving energy consumption.

3. The adhesion promoter used in the present invention is mixed by chlorinated polyolefin, alkoxy functional group silane oligomer, BH-403 epoxy resin in a ratio of 2:3:5, which can effectively improve the adhesion between asphalt and Adhesion at the aggregate interface.

4. The acrylonitrile-butadiene-styrene copolymer grafted with maleic anhydride and polycaprolactone used in the present invention can improve the compatibility between waste rubber powder and asphalt, improve its swelling effect, reduce Occurrence of small asphalt pavement segregation phenomenon.

5. Adding benzyl glycidyl ether 692, dicyclopentadiene and POE DF840 used in the present invention to rubber asphalt can improve the low-temperature ductility and crack resistance of rubber asphalt.

6. After a large amount of research and tests, the results show that applying the modified asphalt produced by the present invention to the laying of asphalt pavement can significantly reduce construction difficulty and cost, reduce energy consumption, and effectively improve asphalt and aggregate. At the same time, it improves the compatibility between waste rubber powder and asphalt, improves its swelling effect, reduces the occurrence of asphalt pavement segregation, and improves the low-temperature ductility and crack resistance of rubber asphalt. At the same time, due to the presence of a variety of anti-aging agents in waste rubber powder, it can effectively improve the anti-aging ability of asphalt, prevent the cracking of asphalt pavement due to brittleness and hardening in the later period of use, and prolong the maintenance period and service life of the pavement.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. In addition, the configurations of the structures described in the following embodiments are only examples, and the present invention is not limited to the following All other implementations obtained by persons of ordinary skill in the art without creative efforts for the structures described in the implementations of the above-mentioned implementations fall within the scope of protection of the present invention.

From the above technical scheme, the synergistic mechanism between the raw materials of this application is: waste rubber powder, acrylonitrile-butadiene-styrene copolymer, maleic anhydride, polycaprolactone, benzyl glycidyl ether 692, bicyclic Pentadiene and POE DF840, viscosity reducer, adhesion promoter. These several materials interact synergistically to improve the road performance of the modified asphalt.

Rubber asphalt prepared with waste tire rubber powder as a modifier can significantly improve the performance of asphalt pavement, and improve the road performance of asphalt pavement such as rutting resistance, reflective cracks, water stability, and fatigue cracking. The performance of rubber asphalt mainly comes from the interaction between rubber and asphalt. After the rubber particles are fully mixed with the asphalt at high temperature, they absorb the light components in the asphalt, making the remaining asphalt hard and increasing in viscosity.

ABS resin made by graft copolymerization of acrylonitrile, butadiene and styrene has both good strength and toughness, easy to process and shape, and low price. Polycaprolactone has degradability, excellent biocompatibility and Functional modification and other advantages, and maleic anhydride, as one of the components of the anti-stripping agent, can effectively increase the adhesion between asphalt and aggregates, and improve the anti-stripping performance of asphalt pavement. Adding acrylonitrile-butadiene-styrene copolymer grafted maleic anhydride and polycaprolactone to asphalt can enhance the interaction between several materials, and maleic anhydride has some polar groups , which increases the polarity of asphalt, which is beneficial to improve the bonding strength between modified asphalt and aggregate. Improve the compatibility between rubber powder and asphalt, improve its swelling effect, and further reduce the occurrence of asphalt pavement segregation.

Benzyl glycidyl ether 692 is a commonly used reactive diluent for cationic polymerized epoxy resins, which has a good dilution effect on epoxy resins. Dicyclopentadiene is a new type of thermosetting material with excellent toughness and rigidity. Engineering plastics can improve the toughness of modified asphalt to a certain extent. Under the synergistic toughening effect of POE DF840 and dicyclopentadiene, modified asphalt will produce a large number of cracks when POE DF840 and dicyclopentadiene core-shell particles resist impact. Thereby absorbing and dispersing a large amount of impact energy, which can prevent the generation of rutting on the road surface, improve the toughness and crack resistance of the asphalt pavement, and improve the low temperature stability of the asphalt.

Then add viscosity reducer and adhesion promoter at the same time to improve the construction workability of asphalt and improve the adhesion performance of aggregate. This application achieves the effect of improving the high and low temperature performance of rubber asphalt and properly reducing the high temperature viscosity of rubber asphalt, so that the modified asphalt has the characteristics of low cost, resource recycling, high viscosity, strong anti-aging ability, and good construction workability. , to realize the proper utilization of waste tires, which is economical and environmentally friendly, and has important practical significance and engineering application value.

Comparative example 1: SBR modified asphalt

This comparative example provides a kind of SBR modified asphalt, which is a high molecular polymer modified asphalt with outstanding low temperature ductility. The SBR modified by adding SBR with a weight of 4% of the weight of 90# base asphalt to 90# base asphalt Asphalt is provided directly by the manufacturer.

The performance test results of asphalt in this comparative example are shown in Table 1.

Comparative example 2: SBS modified asphalt

This comparative example provides a kind of SBS modified asphalt, high-molecular polymer modified asphalt with excellent high temperature stability and anti-aging performance, which is prepared by adding SBS with a weight of 4% of the weight of 90# base asphalt to 90# base asphalt SBS modified asphalt is directly provided by the manufacturer.

The performance test results of asphalt in this comparative example are shown in Table 1.

Comparative example 3: waste rubber powder modified asphalt

This comparative example provides a kind of waste rubber powder modified asphalt, which is composed of the following raw materials in terms of weight fraction: 90# base asphalt 82%, waste rubber powder (40 mesh) 18%.

The performance test results of asphalt in this comparative example are shown in Table 1.

Comparative example 4: Compound modified asphalt with polyethylene and rubber powder

This comparative example provides a kind of polyethylene and rubber powder composite modified asphalt modified asphalt, which is composed of the following raw materials in terms of weight fraction: 90# matrix asphalt 80.0%, waste rubber powder (40 mesh) 18.0%, polyethylene 2.0 %.

The performance test results of asphalt in this comparative example are shown in Table 1.

Embodiment 1 A kind of high-viscosity composite modified asphalt

This example provides a composite modified asphalt which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability. It is composed of the following raw materials in terms of weight fraction , is characterized in that: in terms of weight fraction, it is composed of the following raw materials: 70.0% of sk90 base asphalt, 18.5% of waste rubber powder, 2.0% of acrylonitrile-butadiene-styrene copolymer, and 1.7% of polycaprolactone %, benzyl glycidyl ether 692 is 1.2%, dicyclopentadiene is 0.7%, POE DF840 is 0.9%, viscosity reducer is 3.0%, adhesion promoter is 2.0%, the sum of the weight percentages of raw materials is 100% .

The above-mentioned base asphalt adopts sk90# base asphalt, which can be replaced by other types of asphalt.

The above-mentioned waste rubber powders are all 40 meshes, and other suitable meshes can also be used instead, such as 20 meshes or 80 meshes.

As mentioned above, the preparation method of the modified asphalt having the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction and workability includes the following steps:

Step 1: First, add montmorillonite and absolute ethanol into the reaction flask at a mass ratio of 1:20, place it in a constant temperature water bath at 80°C, and stir at a high speed of 4000r/min for 1h under ultrasonic conditions. Dissolve the N-oleoyl N-methyl taurate sodium surfactant with a certain amount of absolute ethanol and add it into the reaction flask, and continue ultrasonication and high-speed stirring for 2 hours. The reacted product was filtered and washed with deionized water until no Cl- was detected with 0.20 mol/L AgNO3 solution. The product was dried in a vacuum oven at 100 °C for 36 h. After grinding and sieving, the organically modified montmorillonite, namely the uniform mixture A, was obtained.

Step 2, add maleic anhydride, acrylamide, methyl alkenyl polyoxyethylene ether and mixture A in a three-necked flask with a dropping funnel, a stirrer and a thermometer. The reaction mixture was heated to the reaction temperature, and potassium persulfate was added through the dropping funnel, and at the same time, it was reacted for a predetermined time under nitrogen protection, and cooled to room temperature. The reactant cooled to room temperature was washed repeatedly with ethanol, and then the precipitate was vacuum-dried at room temperature to obtain the final purified product. By changing the amount of the three monomers, composite viscosity reducers of nano-montmorillonite and polymers with different grafting ratios, that is, mixture B, were prepared.

Step 3, chlorinated polyolefin, alkoxy functional group silane oligomer, BH-403 epoxy resin, mixed according to the ratio of 2:3:5 to take a certain amount of chlorinated polyolefin, alkoxy functional group silane oligomer , Pour BH-403 epoxy resin into a 100ml beaker, then put the beaker containing the mixture into the DF-101S constant temperature oil bath (produced by Yuhua Instrument) heated to 80°C for rapid heating, and start stirring, stirring The speed must be slowly increased from slow to fast to the set reaction rate of 2500r/min. After waiting for the mixture to react for 60 minutes, the organic modification of montmorillonite is completed and a uniform mixture C is obtained.

Step 4: Preheat sk90 base asphalt to 185°C in an oven, add mixture B and mixture C, stir at 180°C for 90 minutes at high speed, then add acrylonitrile-butadiene-styrene copolymer grafted maleic anhydride, Polycaprolactone, benzyl glycidyl ether 692, dicyclopentadiene and POE DF840 were stirred with an electric mixer at 3000r/min for 30min at 180°C to obtain modified asphalt

Table 1 shows the performance test results of the modified asphalt in this example, which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability.

Example 2: A high-viscosity composite modified asphalt

This example provides a kind of high-viscosity composite modified asphalt which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability. It is calculated by weight fraction as follows Composition of raw materials: 69.0% of sk90 base asphalt, 18.0% of waste rubber powder, 2.5% of acrylonitrile-butadiene-styrene copolymer, 2.0% of polycaprolactone, 1.4% of benzyl glycidyl ether 692, Dicyclopentadiene is 0.7%, POE DF840 is 0.9%, viscosity reducer is 3.0%, adhesion promoter is 2.0%, and the sum of the weight percentages of raw materials is 100%.

This embodiment is the same as that of embodiment 1 to the requirement of raw material and preparation method.

Table 1 shows the performance test results of the high-viscosity composite modified asphalt in this example, which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability.

Example 3: A high-viscosity composite modified asphalt

This example provides a kind of high-viscosity composite modified asphalt which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability. It is calculated by weight fraction as follows Composition of raw materials: 68.0% of sk90 base asphalt, 19.0% of waste rubber powder, 2.5% of acrylonitrile-butadiene-styrene copolymer, 2.0% of polycaprolactone, 1.0% of benzyl glycidyl ether 692, Dicyclopentadiene is 1.0%, POE DF840 is 1.0%, viscosity reducer is 3.0%, adhesion promoter is 2.0%, and the sum of the weight percentages of raw materials is 100%.

This embodiment is the same as that of embodiment 1 to the requirement of raw material and preparation method.

Table 1 shows the performance test results of the high-viscosity composite modified asphalt in this example, which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability.

Example 4: A high-viscosity composite modified asphalt

This example provides a kind of high-viscosity composite modified asphalt which has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability. It is calculated by weight fraction as follows Composition of raw materials: 66.0% of sk90 base asphalt, 18.5% of waste rubber powder, 2.5% of acrylonitrile-butadiene-styrene copolymer, 2.0% of polycaprolactone, 1.3% of benzyl glycidyl ether 692, Dicyclopentadiene is 1.0%, POE DF840 is 1.0%, viscosity reducer is 4.0%, adhesion promoter is 2.2%, and the sum of the weight percentages of raw materials is 100%.

This embodiment is the same as that of embodiment 1 to the requirement of raw material and preparation method.

This example has the advantages of low cost, high resource recycling rate, high viscosity, strong anti-aging ability, and good construction workability. The performance test results of the high-viscosity composite modified asphalt are shown in Table 1.

Modified asphalt performance test:

The following performance tests are performed on the samples of Comparative Examples 1-4 and the samples of Examples 1-4.

Tests include penetration, softening point, ductility (low temperature ductility, 5°C) and Brookfield viscosity at 135°C of the modified asphalt of the example sample and the comparative sample. For details, refer to JTG E20-2011 "Highway Engineering Asphalt and Asphalt Mixture Test Procedures".

As shown in Table 1, it is the test results of the penetration, softening point, low temperature ductility and viscosity of the samples of the examples of the present invention and the comparative samples. It can be seen from Table 1 that Comparative Example 1 (SBR modified asphalt) has a lower softening point and viscosity, which makes the high temperature stability of the asphalt pavement poor, and obviously does not meet the requirements for the use of asphalt pavement; Comparative Example 2 (SBS modified Asphalt) is more stable than Comparative Example 1, but its viscosity is low and does not meet the standard Brookfield viscosity requirement of 1.5-3.0 Pa at 135°C, so it cannot meet the road conditions in high-temperature and rainy areas in China; from Comparative Example 3 (rubber modified Asphalt) and comparative example 4 (polyethylene and rubber powder) performance parameters, the effect of single-mixed rubber on asphalt modification is not good, although the high-temperature performance of asphalt is significantly improved, but its low-temperature performance is poor. In addition, the viscosity of rubber powder and polyethylene composite modified asphalt is too high, which obviously exceeds the specification requirements, which seriously affects the actual construction workability, and its ductility is too low, and the low temperature performance is poor. However, compared with the samples of the four examples of the present invention and the comparative examples 1 to 4, under the joint action of various modifiers and multiple materials, the various indicators of the modified asphalt are significantly improved, making it have a higher softening effect. The ductility has also been improved to a certain extent, so that the high and low temperature performance of the modified asphalt has been significantly improved, and the viscosity has also reached a reasonable range without the viscosity being too high to increase the difficulty of construction. It has strong technical advantages in high-temperature and rainy areas that require high-temperature performance of asphalt pavement.

Table 1 The test results of various indicators of the modified asphalt of the sample of the embodiment and the sample of the comparative example

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. a composite modified high-viscosity asphalt, is characterized in that, its preparation raw material comprises: SK90 base asphalt, waste rubber powder, acrylonitrile-butadiene-styrene copolymer, polycaprolactone, benzyl glycidyl ether 692, dicyclopentadiene and POE DF840, viscosity reducer, adhesion promoter. 2. A composite modified high-viscosity asphalt according to claim 1, characterized in that: its preparation raw materials include 65.8% to 70.6% of SK90 base asphalt and 18.0% to 20.0% of waste rubber powder in terms of weight fraction , acrylonitrile-butadiene-styrene copolymer 1.7%~2.5%, polycaprolactone 1.5%~2.0%, benzyl glycidyl ether 692 1.0%~1.5%, dicyclopentadiene 0.5% ~1.0%, POE DF840 is 0.7%~1.0%, viscosity reducer is 3.0%~5.0%, adhesion promoter is 2.0%~3.0%. 3. A composite modified high-viscosity asphalt according to claim 2, characterized in that: the raw materials for its preparation include 70.0% of SK90 matrix asphalt, 18.5% of waste rubber powder, and acrylonitrile-butadiene ethylene-styrene copolymer 2.0%, polycaprolactone 1.7%, benzyl glycidyl ether 692 1.2%, dicyclopentadiene 0.7%, POE DF840 0.9%, viscosity reducer 3.0%, attached The concentration accelerator is 2.0%. 4. a kind of composite modified high-viscosity asphalt according to claim 1, is characterized in that, described viscosity reducer adopts anionic surfactant N-oleoyl N-methyl taurate sodium, carries out to montmorillonite Organic modification, and under the condition of potassium persulfate as the initiator, three monomers of maleic anhydride, acrylamide and methyl vinyl polyoxyethylene ether are selected to graft to form nano-montmorillonite and polymer composite viscosity reduction agent. 5. A kind of composite modified high-viscosity asphalt according to claim 4, is characterized in that, described viscosity reducer, in parts by weight, is made by mixing the following raw materials: anionic surfactant N-oleoyl Sodium N-methyl taurate is 3.0% to 5.0%, montmorillonite is 45.6% to 50.8%, potassium persulfate is 3.0% to 4.0%, maleic anhydride is 15.6% to 18.8%, and acrylamide is 12.6%. ~14.8%, methyl alkenyl polyoxyethylene ether is 10.2% ~ 11.4%. 6. A kind of composite modified high-viscosity asphalt according to claim 5, is characterized in that, in described viscosity reducer, by weight, is made up of following raw material mixing: anionic surfactant N-oleoyl Sodium N-Methyl Taurate 4.0%, Montmorillonite 48.6%, Potassium Persulfate 3.5%, Maleic Anhydride 18.6%, Acrylamide 13.9%, Methyl Ethoxylate 11.4% . The sum of the parts by weight of raw materials is 100%. 7. A kind of composite modified high-viscosity asphalt according to claim 1, is characterized in that, described adhesion promoter, in parts by weight, is made up of following raw material mixing: chlorinated polyolefin, alkoxy functional group Silane oligomer, BH-403 epoxy resin. 8. A composite modified high-viscosity asphalt according to claim 7, characterized in that, the adhesion promoter, in parts by weight, is composed of the following raw materials: chlorinated polyolefin 18% to 20% , Alkoxy functional silane oligomer 25% to 30%, BH-403 epoxy resin 45% to 50%. 9. A kind of composite modified high-viscosity asphalt according to claim 8, is characterized in that, described adhesion promoter, by weight, is made up of following raw material mixing: chlorinated polyolefin 20%, alkane Oxy-functional silane oligomer 30%, BH-403 epoxy resin 50%. 10. A preparation method of composite modified high-viscosity asphalt, said a kind of composite modified high-viscosity asphalt is a kind of composite modified high-viscosity asphalt described in any one of claims 1-9, it is characterized in that the method Follow the steps below: S1: First, add montmorillonite and absolute ethanol into the reaction flask according to the mass ratio of 1:20, place it in a constant temperature water bath at 80°C, and stir at a high speed of 4000r/min for 1h under ultrasonic conditions; use a certain amount of Dissolve the N-oleoyl N-methyl taurate sodium surfactant in absolute ethanol and add it to the reaction flask, continue ultrasonication and high-speed stirring for 2 hours; The AgNO3 solution of L was detected until there was no Cl-; the product was dried in a vacuum oven at 100°C for 36 hours; after grinding and sieving, the organically modified montmorillonite was obtained, that is, a uniform mixture A; S2: Add maleic anhydride, acrylamide, methyl alkenyl polyoxyethylene ether and mixture A to a three-necked flask with a dropping funnel, a stirrer and a thermometer; heat the reaction mixture to the reaction temperature, and pass through the dropping funnel Add in potassium persulfate, and at the same time add to react for a predetermined time under the protection of nitrogen, and cool to room temperature; wash the reactant cooled to room temperature with ethanol repeatedly, and then vacuum-dry the precipitate at room temperature to obtain the final purified product; change three The amount of monomer used to prepare the composite viscosity reducer of nano-montmorillonite and polymer with different grafting rates, i.e. mixture B; S3: Chlorinated polyolefin, alkoxy functional group silane oligomer, BH-403 epoxy resin, mixed according to the ratio of 2:3:5 to take a certain amount of chlorinated polyolefin, alkoxy functional group silane oligomer, Pour BH-403 epoxy resin into a 100ml beaker, then put the beaker containing the mixture into the DF-101S constant temperature oil bath (produced by Yuhua Instrument) heated to 80°C for rapid heating, and start stirring, the stirring speed It must be slowly increased from slow to fast to the set reaction rate of 2500r/min, and after waiting for the mixture to react for 60 minutes, the organic modification of montmorillonite is completed, and a uniform mixture C is obtained; S4: Preheat sk90 base asphalt to 185°C in an oven, add mixture B and mixture C, stir at 180°C for 90 minutes at high speed, and then add acrylonitrile-butadiene-styrene copolymer grafted malay Acid anhydride, polycaprolactone, benzyl glycidyl ether 692, dicyclopentadiene and POE DF840 were stirred with an electric mixer at 3000r/min for 30min at 180°C to obtain modified asphalt.