CN112111166A - Waste clay asphalt mixture modifier and preparation method thereof - Google Patents
Waste clay asphalt mixture modifier and preparation method thereof Download PDFInfo
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- CN112111166A CN112111166A CN202011024725.6A CN202011024725A CN112111166A CN 112111166 A CN112111166 A CN 112111166A CN 202011024725 A CN202011024725 A CN 202011024725A CN 112111166 A CN112111166 A CN 112111166A
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention provides a waste clay asphalt mixture modifier and a preparation method thereof, and relates to the technical field of high polymer materials and road engineering. The modifier for the waste argil asphalt mixture is prepared by compounding the waste argil with other raw materials, and can ensure that the modified waste argil asphalt mixture has the advantages of high-temperature stability, low-temperature crack resistance, water stability, fatigue resistance, ageing resistance and the like, and all performance indexes of the modified waste argil asphalt mixture can meet the technical requirements, so that the road paved by the modified asphalt mixture can meet the current load requirement, and the service life of the road is prolonged.
Description
Technical Field
The invention relates to the technical field of high polymer materials and road engineering, in particular to a waste clay asphalt mixture modifier and a preparation method thereof.
Background
The material for paving the flexible pavement is the asphalt mixture, along with the development of economic technology, the traffic load capacity of modern roads is increased rapidly, the load capacity is increased rapidly, so the performance requirement on the asphalt mixture is required to be improved year by year, the original mixture pavement produced by common heavy traffic asphalt can not meet the current situation, and the service life is greatly shortened.
In view of the above, it is an urgent technical problem to provide an asphalt mixture modifier for modifying an asphalt mixture so that the performance of the modified asphalt mixture meets the use requirement.
Disclosure of Invention
The invention aims to provide an asphalt mixture modifier.
In order to solve the problems, the invention provides a waste clay asphalt mixture modifier, which comprises the components of waste clay, hard asphalt, a polymer additive, a stabilizer, terpene resin, rubber filling oil and oxidized polyethylene wax.
Wherein the waste clay is clay without adsorption activity, and 10-30% of grease is usually adsorbed in the waste clay; at present, the direct treatment mode of waste argil is to burn as fuel or to fill as waste, the burning treatment mode can pollute the atmosphere, and the filling treatment mode can pollute the land environment and underground water quality; if the waste clay is directly exposed to the environment, the unsaturated oil with high content in the waste clay cannot be fully utilized, and the risk of spontaneous combustion caused by the contact of the unsaturated oil and air also exists.
The prior chemical and physical treatment modes of the waste argil comprise a solvent extraction method, a squeezing method, an alkaline cooking method, a surface activity method, a supercritical treatment method and the like, and the treatment modes are used for extracting oil and fat to regenerate the waste argil; the treatment modes have complex process and higher equipment investment cost, the problem of stacking the waste argil cannot be fundamentally solved, and the adsorption activity of the regenerated argil cannot be completely recovered.
According to the method, the waste argil is used as the raw material of the asphalt mixture modifier, and the asphalt mixture additive is prepared by compounding the waste argil with other raw materials, so that on one hand, the waste argil can be recycled, and the additional value of the waste argil is increased while the problem that the waste argil is difficult to treat subsequently is solved.
Because of containing the grease in the useless carclazyte, using useless carclazyte to lead to the softening point low for preparing asphalt mixture modifier as raw materials, be difficult to the granulation, consequently, this application reduces the solidification degree of difficulty in this modifier preparation process through adding stereoplasm pitch to through the cooperation of useless carclazyte and stereoplasm pitch, when carrying out recycle to useless carclazyte, reduce the preparation degree of difficulty, guarantee going on smoothly of granulation process.
By adding the polymer additive, the polymer additive can form a space network structure in the hard asphalt, so that the hard asphalt has the special properties of rubber, such as high temperature resistance, low temperature resistance, aging resistance and the like, thereby improving the high temperature resistance, the low temperature resistance, the aging resistance and the like of the asphalt mixture additive.
Meanwhile, the grease contained in the waste clay can be embedded in a space network structure formed by the hard asphalt and the polymer additive, so that on one hand, the grease in the waste clay is fully utilized to improve the performances of the asphalt mixture modifier, such as toughness, on the other hand, the bonding strength among the residual grease in the waste clay, the asphalt and the polymer additive is improved, and the pollution of the grease to the environment is avoided.
The stabilizer added in the application is mainly used as a cross-linking agent and a polymerization initiator of a polymer additive, and is also a curing agent of terpene resin; by crosslinking, the physical properties of the polymer additive, such as heat resistance, chemical resistance, crack resistance, and mechanical strength, are improved.
In addition, the stabilizer is coupled with unsaturated oil in the residual oil of the waste clay, and the unsaturated oil and the saturated oil in the residual oil are embedded in a space network structure formed by the hard asphalt and the polymer additive, so that the toughness of the asphalt mixture modifier is improved.
The terpene resin has the advantages of good oxidation resistance and thermal stability, and good compatibility and solubility, and particularly has excellent compatibility, heat resistance and tackifying property in hot sols such as EVA (ethylene vinyl acetate), SIS (styrene-isoprene copolymer) and SBS (styrene-butadiene-styrene) series; for the asphalt mixture, the terpene resin is added, so that the high temperature resistance and the mechanical strength of the asphalt mixture can be improved; according to the application, the terpene resin is added, the heat resistance and the viscosity increasing of the polymer additive are enhanced by utilizing the characteristic of good compatibility of the terpene resin and the polymer additive, so that a space net structure formed by the polymer additive and the hard asphalt has higher toughness, meanwhile, the terpene resin and the stabilizer are coupled with unsaturated oil in the residual oil of the waste clay, and are embedded in the space net structure formed by the hard asphalt and the polymer additive together with the residual saturated oil to form a strong combined action, and the toughness of the asphalt mixture modifier is further improved.
The rubber filling oil has the main function of improving the mixing and dispersing functions of the polymer additive in the asphalt mixture modifier, and the polymer additive is a high molecular material and is easy to generate agglomeration when being added into asphalt; the rubber filling oil can enable the polymer additive to have low-temperature elasticity, and further enable the produced modified asphalt mixture to have better low-temperature crack resistance.
The oxidized polyethylene wax can reduce the adhesive force of the polymer additive during thermoplastic melting, and in addition, the fluidity of the whole system in a molten state is also increased; meanwhile, the addition of oxidized polyethylene wax can reduce the demolding difficulty in the subsequent drip granulation and improve the yield.
The modifier for the asphalt mixture containing the waste argil is prepared by compounding the waste argil with other raw materials, can be used for the asphalt mixture, and can ensure that the modified asphalt mixture has the advantages of high-temperature stability, low-temperature crack resistance, water stability, fatigue resistance, ageing resistance and the like, and all performance indexes of the modified asphalt mixture can meet the technical requirements, so that the road surface paved with the modified asphalt mixture can meet the current load requirement, and the service life of the road surface is prolonged.
In addition, the invention also realizes the comprehensive utilization of the waste argil while preparing the waste argil asphalt mixture modifier, provides a method for treating the waste argil, and solves the problem that the waste argil is difficult to carry out subsequent treatment; compared with the traditional method for treating the waste argil, the method for treating the waste argil has the advantages that the equipment investment is small, meanwhile, the waste argil is comprehensively utilized and developed into the asphalt mixture modifier with high added value, and the method is favorable for saving energy, developing circular economy and protecting environment and developing coordinately.
Optionally, the weight ratio of each component is 15-25 parts of the waste argil, 60-70 parts of the hard asphalt, 10-15 parts of the polymer additive, 0.1-1 part of the stabilizer, 15-25 parts of the terpene resin, 1-2 parts of the rubber filling oil and 1-2 parts of the oxidized polyethylene wax.
According to the application, the waste argil is compounded with other raw materials to prepare the asphalt mixture modifier, so that the using amount of high-price polymer additives and other high-molecular polymers in the modified asphalt mixture can be reduced, and the comprehensive performance (such as high-temperature rutting, low-temperature crack resistance, water damage, service life and the like) of the final modified asphalt mixture is not influenced.
The spent bleaching earth is selected from at least one of spent bleaching earth after refining lubricating oil bleaching earth, spent bleaching earth after refining lubricating grease bleaching earth, and spent bleaching earth after refining vegetable oil bleaching earth.
The clay purification of lubricating oil, the clay purification of lubricating grease and the clay purification of vegetable oil utilize the adsorption and decoloration performance of clay to improve the quality of lubricating oil, lubricating grease and vegetable oil, reduce the carbon residue value and acid value (or acidity) of the oil and improve the color and stability of the oil; after the completion of the lubricating oil clay purification, the lubricating grease clay purification and the vegetable oil clay purification, the clay is changed into waste clay with 10 to 30 percent of oil adsorbed inside.
The raw materials of the waste argil working asphalt mixture modifier are reasonably utilized to change waste argil and oil adsorbed in the waste argil into valuable, and meanwhile, the waste argil can be prevented from being treated independently; compared with the traditional treatment method of the waste argil, the treatment method of the waste argil is more environment-friendly and economic, the equipment investment cost is low, and the developed product has higher added value; compared with methods such as solvent extraction, squeezing, soda boiling, surface active method, supercritical treatment and the like for extracting grease and regenerating the waste carclazyte, the method provided by the invention has the advantages that the treatment of the waste carclazyte is more complete, and treatment modes such as burning, landfill and the like are avoided.
Optionally, the softening temperature of the hard asphalt ranges from 100 ℃ to 140 ℃; the melting temperature range of the hard asphalt is 160-220 ℃.
In order to ensure that the subsequent granulation process is smoothly carried out, the hard asphalt is preferably high-softening-point hard asphalt; because the waste clay contains 10 to 30 percent of grease, the softening point is lower, and the softening point is usually below 100 ℃, so the waste clay is difficult to granulate; according to the method, the high-softening-point hard asphalt with the softening temperature range of 100-140 ℃ and the melting temperature range of 160-220 ℃ is added, so that the softening point temperature is increased, the small granules after granulation are easy to solidify, the granulation difficulty is reduced, and the efficiency is improved.
Optionally, the polymer additive is a styrene-butadiene-styrene block copolymer, the styrene-butadiene-styrene block copolymer is linear or star-shaped, and the styrene-butadiene-styrene block copolymer has a molecular weight ranging from 8 to 30 ten thousand.
Optionally, the stabilizer is selected from at least one of dicumyl peroxide and sulfur.
Optionally, the terpene resin has a molecular weight in the range of 650 to 2600.
Optionally, the kinematic viscosity of the rubber extender oil at 40 ℃ is 130mm2/s～180mm2(s) a density of 900kg/m at 20 DEG C3～960kg/m3。
Optionally, the oxidized polyethylene wax is obtained by deep cracking and oxidation of high-pressure low-density polyethylene, and the molecular weight range of the oxidized polyethylene wax is 1000-3000.
The invention also aims to provide a preparation method of the waste clay asphalt mixture modifier, which comprises the following steps:
s1: melting the hard asphalt to obtain molten asphalt;
s2: stirring and mixing the waste clay, the polymer additive, the stabilizer, the terpene resin, the rubber filling oil, the oxidized polyethylene wax and the molten asphalt at the temperature of 150-180 ℃ to obtain a molten mixed material;
s3: granulating the mixed material in the molten state by granulation equipment to obtain a liquid drop-shaped material;
s4: and cooling the liquid drop-shaped material to obtain the solid granular waste argil asphalt mixture modifier.
Specifically, in the preparation process, the melting temperature is set, and the hard asphalt is melted at high temperature in a melting system; weighing each component by a weighing system, sequentially adding each component after being weighed into a mixing and stirring system, and stirring at the temperature of 150-180 ℃ to fully mix the materials to obtain a mixed material in a molten state; then adding the mixed material in a molten state into a distributor of drip granulation equipment, so that the mixed material in the molten state forms liquid drops, and further dropping the liquid drops on a conveying steel belt; cooling the conveying steel belt, wherein the specific cooling mode is preferably that the lower surface of the conveying steel belt is sprayed with cooling water and the upper surface of the conveying steel belt is blown by freezing air, and the liquid-drop-shaped spent bleaching clay asphalt mixture modifier is cooled to be solid particles; the particle size of the asphalt mixture modifier particles preferably prepared by the method is 2-6 mm; meanwhile, the flue gas generated in the preparation process is recycled to a spray adsorption tower, cooling water is recycled to a water tank through a cooling tower, and cold east wind is generated by a refrigerator; and (3) feeding the solid granular waste argil asphalt mixture modifier to an automatic packaging system through a scraper for product packaging.
The preparation method of the waste argil asphalt mixture modifier provided by the invention has the advantages that the preparation process is simple, the continuous production is easy to realize, and the preparation efficiency is improved; meanwhile, the prepared asphalt mixture modifier is granular, and can be directly put into an asphalt mixer through corresponding feeding equipment to produce the modified asphalt mixture in actual use without modifying the polymer of common heavy-traffic asphalt, and an asphalt heat-insulating tank on the site of the asphalt mixer does not need high-temperature heating storage, so that the energy is saved, and the carbon emission is reduced.
Detailed Description
The embodiments of the present invention are described in detail below, the embodiments described below are exemplary and are intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below.
Example one
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 65 parts by weight of hard asphalt into a melting system, and melting at 160 ℃ to obtain molten asphalt;
s2: stirring and mixing 15 parts by weight of waste clay obtained after refining lubricating oil clay, 15 parts by weight of linear styrene-butadiene-styrene block copolymer, 0.3 part by weight of dicumyl peroxide, 20 parts by weight of terpene resin, 1.5 parts by weight of rubber filling oil, 1.5 parts by weight of oxidized polyethylene wax and molten asphalt at 150 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy-duty petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 175 ℃ for stirring for 50s, and the modified asphalt mixture is stirred to obtain a first asphalt mixture.
Example two
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 60 parts by weight of hard asphalt into a melting system, and melting at 170 ℃ to obtain molten asphalt;
s2: stirring and mixing 25 parts by weight of waste clay obtained after refining lubricating grease clay, 11 parts by weight of star-shaped styrene-butadiene-styrene block copolymer, 0.4 part by weight of sulfur, 18 parts by weight of terpene resin, 1.2 parts by weight of rubber filling oil, 1.8 parts by weight of oxidized polyethylene wax and molten asphalt at 155 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy traffic petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 180 ℃ for stirring for 50s, and the modified asphalt mixture is stirred to obtain a second asphalt mixture.
EXAMPLE III
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 70 parts by weight of hard asphalt into a melting system, and melting at 180 ℃ to obtain molten asphalt;
s2: stirring and mixing 20 parts by weight of waste clay obtained after the clay refining of vegetable oil, 10 parts by weight of star-shaped styrene-butadiene-styrene block copolymer, 0.6 part by weight of sulfur, 25 parts by weight of terpene resin, 1.6 parts by weight of rubber filling oil, 1.4 parts by weight of oxidized polyethylene wax and molten asphalt at 160 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy-duty petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 185 ℃ for stirring for 50s, and a modified asphalt mixture is stirred to obtain a third asphalt mixture.
Example four
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 68 parts by weight of hard asphalt into a melting system, and melting at 190 ℃ to obtain molten asphalt;
s2: stirring and mixing 16 parts by weight of waste clay obtained after the clay refining of the lubricating grease, 14 parts by weight of linear styrene-butadiene-styrene block copolymer, 0.8 part by weight of dicumyl peroxide, 15 parts by weight of terpene resin, 1.3 parts by weight of rubber filling oil, 1.7 parts by weight of oxidized polyethylene wax and molten asphalt at the temperature of 170 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy traffic petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 180 ℃ for stirring for 50s, and a modified asphalt mixture is prepared by stirring to obtain a fourth asphalt mixture.
EXAMPLE five
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 65 parts by weight of hard asphalt into a melting system, and melting at 210 ℃ to obtain molten asphalt;
s2: stirring and mixing 23 parts by weight of waste clay obtained after the clay refining of the lubricating grease, 12 parts by weight of linear styrene-butadiene-styrene block copolymer, 0.5 part by weight of dicumyl peroxide, 20 parts by weight of terpene resin, 1.7 parts by weight of rubber filling oil, 1.5 parts by weight of oxidized polyethylene wax and molten asphalt at 180 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy traffic petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 180 ℃ for stirring for 50s, and the modified asphalt mixture is stirred to obtain a fifth asphalt mixture.
EXAMPLE six
The embodiment provides a preparation method of a waste clay asphalt mixture modifier and the waste clay asphalt mixture modifier prepared by the preparation method.
S1: adding 62 parts by weight of hard asphalt into a melting system, and melting at 220 ℃ to obtain molten asphalt;
s2: stirring and mixing 25 parts by weight of waste clay obtained after the clay refining of the lubricating grease, 13 parts by weight of linear styrene-butadiene-styrene block copolymer, 0.6 part by weight of dicumyl peroxide, 23 parts by weight of terpene resin, 1.2 parts by weight of rubber filling oil, 1.4 parts by weight of oxidized polyethylene wax and molten asphalt at 165 ℃ to obtain a molten mixed material;
s3: adding the mixed material in a molten state into a distributor of drip granulation equipment to enable the mixed material in the molten state to form liquid drops, and dripping the liquid drops on a conveying steel belt to obtain liquid drop-shaped materials;
s4: and cooling the liquid drop-shaped materials by spraying cooling water on the lower surface of the conveying steel belt and blowing the upper surface of the conveying steel belt by using freezing air to obtain the solid granular waste argil asphalt mixture modifier with the grain size range of 2-6 mm.
In order to further verify the performance of the prepared waste clay asphalt mixture modifier, 8 parts by weight of the waste clay asphalt mixture modifier prepared by the application and 92 parts by weight of No. 70 heavy traffic petroleum asphalt are respectively put into an asphalt mixer, the aggregate temperature is 180 ℃ for stirring for 50s, and a modified asphalt mixture is prepared by stirring to obtain a sixth asphalt mixture.
The six prepared asphalt mixtures were sampled, test pieces were prepared according to the test procedures, and data of the asphalt mixtures were tested, as shown in table 1.
TABLE 1 Bituminous mixture data comparison
As can be seen from the data in Table 1, the asphalt mixture modified by the waste clay asphalt mixture modifier prepared by the method has various pavement performance indexes meeting the performance index requirements of the modified asphalt mixture in technical Specification for road asphalt pavement construction (JTG F40-2004).
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. The waste clay asphalt mixture modifier is characterized by comprising the components of waste clay, hard asphalt, a polymer additive, a stabilizer, terpene resin, rubber filling oil and oxidized polyethylene wax.
2. The waste clay asphalt mixture modifier according to claim 1, wherein the weight parts of the components comprise 15-25 parts of the waste clay, 60-70 parts of the hard asphalt, 10-15 parts of the polymer additive, 0.1-1 part of the stabilizer, 15-25 parts of the terpene resin, 1-2 parts of the rubber extender oil and 1-2 parts of the oxidized polyethylene wax.
3. The spent clay-asphalt mixture modifier according to claim 1, wherein the spent clay is at least one selected from the group consisting of spent clay after refining lubricating oil clay, spent clay after refining grease clay, and spent clay after refining vegetable oil clay.
4. The spent clay asphalt mixture modifier according to claim 1, wherein the hard asphalt has a softening temperature ranging from 100 ℃ to 140 ℃; the melting temperature range of the hard asphalt is 160-220 ℃.
5. The spent clay asphalt mixture modifier according to claim 1, wherein the polymer additive is a styrene-butadiene-styrene block copolymer, the styrene-butadiene-styrene block copolymer is linear or star-shaped, and the molecular weight of the styrene-butadiene-styrene block copolymer is in the range of 8 to 30 ten thousand.
6. The spent clay asphalt mixture modifier according to claim 1, wherein the stabilizer is at least one selected from the group consisting of dicumyl peroxide and sulfur.
7. The spent clay asphalt mixture modifier according to claim 1, wherein the terpene resin has a molecular weight ranging from 650 to 2600.
8. The spent clay asphalt mixture modifier according to claim 1, wherein the rubber extender oil has a kinematic viscosity at 40 ℃ of 130mm2/s～180mm2(s) a density of 900kg/m at 20 DEG C3～960kg/m3。
9. The waste clay asphalt mixture modifier as set forth in claim 1, wherein the oxidized polyethylene wax is obtained by deep cracking and oxidation of high-pressure low-density polyethylene, and the molecular weight of the oxidized polyethylene wax is in the range of 1000-3000.
10. The preparation method of the spent clay asphalt mixture modifier according to claim 1, characterized by comprising the following steps:
s1: melting the hard asphalt to obtain molten asphalt;
s2: stirring and mixing the waste clay, the polymer additive, the stabilizer, the terpene resin, the rubber filling oil, the oxidized polyethylene wax and the molten asphalt at the temperature of 150-180 ℃ to obtain a molten mixed material;
s3: granulating the mixed material in the molten state by granulation equipment to obtain a liquid drop-shaped material;
s4: and cooling the liquid drop-shaped material to obtain the solid granular waste argil asphalt mixture modifier.
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