Environment-friendly regenerant for carclazyte pressed oil and application of environment-friendly regenerant in asphalt concrete

Abstract

The invention discloses a carclazyte pressed oil environment-friendly regenerant and application thereof in asphalt concrete, and relates to the technical field of asphalt regeneration. The invention discloses an environment-friendly regenerant for carclazyte pressed oil. The environment-friendly regenerant comprises the following raw materials in parts by weight: 85-95 parts of carclazyte pressed oil, 5-10 parts of a plasticizer, 1-5 parts of an anti-aging agent and 1-5 parts of a tackifier, according to the present invention, the prepared carclazyte pressed oil environmental protection regenerant is added into the asphalt concrete containing the old asphalt to supplement the light component lacking in the aged asphalt, such that the stiffness of the waste asphalt can be effectively reduced, the ductility can be effectively improved, the obtained recycled asphalt has the anti-aging ability, and the service life of the recycled asphalt pavement can be effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt regeneration, and in particular to an environmentally friendly regeneration agent of clay pressed oil and application thereof in asphalt concrete. Background Art

[0002] In recent years, my country's highway construction has developed rapidly, the traffic volume on highways has increased year by year, and the number of heavy-loaded vehicles has gradually increased, resulting in different degrees of damage and disease on asphalt concrete pavements in many areas of the country. The maintenance and maintenance of asphalt concrete pavements in my country has entered a critical period. At present, the common maintenance methods of asphalt mixtures are hot regeneration and cold regeneration. Among them, factory-mixed hot regeneration technology is the most widely used regeneration technology. By analyzing the properties of old asphalt in waste asphalt mixtures, suitable regeneration agents and regeneration processes are selected, and then new aggregates are added to achieve gradation control of recycled asphalt mixtures. Appropriate mix design and special regeneration mixing process are selected to prepare recycled asphalt mixtures that reach the performance level of new asphalt mixtures, which are used in different layers of asphalt pavements. Factory-mixed hot regeneration technology is relatively mature and has relatively stable quality, but it lacks high-efficiency regeneration agents. Traditional regeneration agents are refined from petroleum, and the base oil is mineral oil. The cost of use is too high, the stability is poor, and it harms the natural environment and human health.

[0003] Activated clay is generally added for decolorization during the oil refining process, and the addition amount is about 2%. Decolorized waste clay is a by-product of oil processing plants, generally containing 20-30% oil. Over the years, most of the waste clay from oil plants has been directly mixed with coal for use as fuel, or buried as waste and discarded. If the decolorized waste clay from the oil plant is not treated in time, it will not only pollute the environment and endanger the quality of groundwater, but also contain highly unsaturated oil. The waste clay is in contact with air and is prone to spontaneous combustion. The present application utilizes the oil recovered from the waste clay as the base material of the regeneration agent to prepare a new type of clay pressed oil environmentally friendly regeneration agent, which is added to asphalt concrete containing old asphalt. It not only effectively extends the service life of the regenerated asphalt pavement, but also realizes the regeneration of old materials and saves economic costs. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly regeneration agent of clay pressed oil and its application in asphalt concrete to solve the following technical problems:

[0005] The existing regeneration agent is made by refining petroleum, which has high cost, poor stability and harms the natural environment and human health.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An environmentally friendly regeneration agent for clay pressed oil, comprising the following raw materials in parts by weight: 85-95 parts by weight of clay pressed oil, 5-10 parts by weight of a plasticizer, 1-5 parts by weight of an anti-aging agent, and 1-5 parts by weight of a tackifier;

[0008] The preparation method of the anti-aging agent comprises the following steps:

[0009] S1: Add 4-hydroxybenzophenone, triethylamine and dichloromethane into a reaction kettle and disperse them evenly, control the temperature at 0-5°C, add acryloyl chloride, keep the temperature for reaction for 12-18h, filter, wash with dichloromethane, wash with water, and dry to obtain component 1;

[0010] S2: Add 3-mercaptopropyltrimethoxysilane, ethanol and deionized water into a reaction kettle and disperse them evenly, add acidic montmorillonite, stir at room temperature for 6-9 hours, wash with ethanol and dry to obtain modified montmorillonite;

[0011] S3: In a nitrogen atmosphere, component 1, tetrahydrofuran, 2,2-dihydroxymethylpropionic acid and modified montmorillonite are added into a reaction kettle and dispersed evenly, irradiated under ultraviolet light for 15-30 minutes, filtered, washed and dried to obtain an antioxidant.

[0012] As a further embodiment of the present invention: the addition ratio of 4-hydroxybenzophenone, triethylamine, dichloromethane and acryloyl chloride in S1 is 20-30 g: 15-20 g: 200-500 mL: 10 g.

[0013] As a further scheme of the present invention: the preparation method of the acidic montmorillonite in S2 is: sodium montmorillonite and sulfuric acid solution are added into a reaction kettle and dispersed evenly, the temperature is controlled at 70-80°C, the reaction is kept warm for 6-12 hours, washed with water, and dried to obtain the acidic montmorillonite; the addition ratio of 3-mercaptopropyltrimethoxysilane, ethanol, deionized water, and acidic montmorillonite in S2 is 1-1.5mL:8-16mL:0.5-1mL:10g.

[0014] As a further solution of the present invention: the addition ratio of component 1, tetrahydrofuran, 2,2-dihydroxymethylpropionic acid and modified montmorillonite in S3 is 1-3 g: 100-200 mL: 0.1-0.3 g: 10 g.

[0015] As a further scheme of the present invention: the preparation method of clay pressed oil comprises the following steps: removing impurities, preheating, primary pressing and final pressing of oily clay residue to obtain a mixed liquid, allowing the mixed liquid to stand, separate, and take the oil phase to obtain clay pressed oil; the specific preheating step is to preheat the oily clay residue with water vapor to 50-80°C; the primary pressing pressure is 0.4-0.8MPa; and the final pressing pressure is 50-80MPa.

[0016] As a further solution of the present invention: the plasticizer is one or more of dioctyl phthalate and dioctyl sebacate mixed in any ratio; the tackifier is one or more of C5 petroleum resin, hydrogenated C9 petroleum resin and rosin resin mixed in any ratio.

[0017] As a further scheme of the present invention: a method for preparing an environmentally friendly regeneration agent for clay pressed oil comprises the following steps: preheating the clay pressed oil at 150-160°C by uniform stirring, adding a plasticizer, an anti-aging agent and a viscosity enhancer in sequence, heating to 150-160°C, and uniformly stirring to obtain an environmentally friendly regeneration agent for clay pressed oil.

[0018] As a further solution of the present invention: the specific application is: adding the clay pressed oil environmentally friendly regeneration agent into the asphalt concrete containing old asphalt;

[0019] The preparation method of asphalt concrete comprises the following steps:

[0020] A1: Heat and premix the clay pressed oil environmentally friendly regeneration agent with new asphalt to obtain component A;

[0021] A2: Mix new aggregate with old asphalt to obtain component B;

[0022] A3: Mix component A, component B and mineral powder to obtain asphalt concrete.

[0023] As a further solution of the present invention: the clay pressed oil regeneration agent accounts for 5-15% of the mass of the old asphalt.

[0024] As a further solution of the present invention: the mass ratio of new asphalt to old asphalt in the asphalt concrete is 1:1-3, and the sum of the mass of the new asphalt and the old asphalt accounts for 3.5-4.5% of the total mass of the asphalt concrete.

[0025] As a further solution of the present invention: the new aggregate accounts for 90-94% of the total mass of the asphalt concrete; the mineral powder accounts for 2-5% of the total mass of the asphalt concrete.

[0026] As a further solution of the present invention: the asphalt is any one of 70# base asphalt and 90# base asphalt.

[0027] As a further solution of the present invention: the mineral powder is any one of granite mineral powder, sandstone mineral powder or quartzite mineral powder, and the particle size of the mineral powder is 0.1-0.6 mm.

[0028] As a further solution of the present invention: the new aggregate is crushed pebbles, and the gradation of the new aggregate meets the requirements of "Technical Specifications for Highway Asphalt Pavement Construction (JTG F40-2004)", including coarse and fine aggregates of various specifications with a particle size of 19-26.5mm, a particle size of 16-19mm, a particle size of 9.5-16mm, a particle size of 4.75-9.5mm, a particle size of 2.36-4.75mm and a particle size of 0-2.36mm.

[0029] As a further embodiment of the present invention: the preparation method of old asphalt comprises the following steps:

[0030] B1: Put the collected waste asphalt concrete samples into an oven and heat them at 105℃ for 45-60min to dry the moisture in the mixture and make it loose to obtain a loose mixture;

[0031] B2: Pour the loose mixture into a container and add a solvent (such as trichloroethylene) to soak it to dissolve the asphalt on the aggregate;

[0032] B3: Pour the soaked mixture into a centrifugal extractor for centrifugal treatment, and the mixture of asphalt and solvent is separated from the aggregate to form an asphalt solution;

[0033] B4: Using an oil bath to heat and evaporate the obtained asphalt solution to remove the solvent;

[0034] B5: After evaporating the solvent, pure old asphalt is obtained.

[0035] Beneficial effects of the present invention:

[0036] (1) The present application utilizes clay pressed oil as the base oil. The clay pressed oil has a high content of light components such as aromatic hydrocarbons and saturated hydrocarbons. As a supplement to the light components missing in aged asphalt, it can effectively reduce the stiffness of waste asphalt and increase its ductility. The regenerated asphalt obtained has anti-aging ability, which effectively extends the service life of the regenerated asphalt pavement.

[0037] (2) In the present application, the prepared white clay pressed oil environmentally friendly regeneration agent is first mixed with new asphalt, so that the regeneration agent is first evenly dispersed in the new asphalt, and then mixed with the old material. This improves the problem that the regeneration agent and the old material will adhere to the inner wall of the mixing pot and be absorbed, causing losses and uneven mixing, and improves the regeneration capacity of the regeneration agent. The regeneration effect of the regeneration agent can be fully exerted under the condition of ultra-high mixing of the old material in the asphalt mixture.

[0038] (3) The present application is based on montmorillonite treated with sulfuric acid, and uses a mercaptosilane coupling agent to organically modify the acidic montmorillonite, so that the montmorillonite layers are grafted with mercapto groups; and 4-hydroxybenzophenone and acryloyl chloride are grafted to obtain component one; the present application uses mercapto-double bonds to undergo click chemistry modification under ultraviolet conditions to graft organic matter between the montmorillonite layers to obtain an anti-aging agent; the anti-aging agent prepared by the present application is added to the environmentally friendly regeneration agent of white clay pressed oil, which effectively improves the problem that the regeneration agent prepared by using recycled oil in the existing materials cannot improve the problem that the addition of recycled asphalt leads to reduced temperature resistance and reduced anti-rutting performance of asphalt concrete, and effectively slows down the aging of asphalt. DETAILED DESCRIPTION

[0039] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1 The preparation method of anti-aging agent comprises the following steps:

[0041] S1: Add 10g of sodium montmorillonite and 100mL of sulfuric acid solution into a reactor and disperse them evenly. Control the temperature at 70°C, keep the reaction for 12h, wash with water, and dry to obtain acidic montmorillonite.

[0042] S2: Add 20 g 4-hydroxybenzophenone, 15 g triethylamine and 200 mL dichloromethane into a reaction kettle and disperse them evenly. Control the temperature to 0°C, add 10 g acryloyl chloride, keep the temperature to react for 12 h, filter, wash with dichloromethane, wash with water, and dry to obtain component 1.

[0043] S3: 1 mL of 3-mercaptopropyltrimethoxysilane, 8 mL of ethanol, and 0.5 mL of deionized water were added to the reactor and dispersed evenly, 10 g of acidic montmorillonite was added, stirred at room temperature for 6 h, washed with ethanol, and dried to obtain modified montmorillonite;

[0044] S4: In a nitrogen atmosphere, 1 g of component 1, 100 mL of tetrahydrofuran, 0.1 g of 2,2-dihydroxymethylpropionic acid, and 10 g of modified montmorillonite were added to a reaction kettle and dispersed evenly. The mixture was irradiated under ultraviolet light (365 nm) for 15 min, filtered, washed, and dried to obtain an antioxidant.

[0045] Embodiment 2 The preparation method of anti-aging agent comprises the following steps:

[0046] S1: Add 10g of sodium montmorillonite and 100mL of sulfuric acid solution into a reactor and disperse them evenly. Control the temperature at 70°C, keep the reaction for 12h, wash with water, and dry to obtain acidic montmorillonite.

[0047] S2: Add 25 g 4-hydroxybenzophenone, 17 g triethylamine and 300 mL dichloromethane into a reaction kettle and disperse them evenly. Control the temperature to 0°C, add 10 g acryloyl chloride, keep the temperature to react for 18 h, filter, wash with dichloromethane, wash with water, and dry to obtain component 1.

[0048] S3: 1.2 mL 3-mercaptopropyltrimethoxysilane, 12 mL ethanol, and 0.8 mL deionized water were added to the reactor and dispersed evenly, 10 g acidic montmorillonite was added, stirred at room temperature for 6 h, washed with ethanol, and dried to obtain modified montmorillonite;

[0049] S4: In a nitrogen atmosphere, 2 g of component 1, 150 mL of tetrahydrofuran, 0.2 g of 2,2-dihydroxymethylpropionic acid, and 10 g of modified montmorillonite were added to a reaction kettle and dispersed evenly. The mixture was irradiated under ultraviolet light (365 nm) for 15 min, filtered, washed, and dried to obtain an antioxidant.

[0050] The preparation method of the anti-aging agent of embodiment 3 comprises the following steps:

[0051] S1: Add 10g of sodium montmorillonite and 100mL of sulfuric acid solution into a reactor and disperse them evenly. Control the temperature at 70°C, keep the reaction for 12h, wash with water, and dry to obtain acidic montmorillonite.

[0052] S2: Add 30 g 4-hydroxybenzophenone, 20 g triethylamine and 500 mL dichloromethane into a reaction kettle and disperse them evenly. Control the temperature at 5°C, add 10 g acryloyl chloride, keep the temperature for 18 hours, filter, wash with dichloromethane, wash with water, and dry to obtain component 1.

[0053] S3: 1.5 mL 3-mercaptopropyltrimethoxysilane, 16 mL ethanol, and 1 mL deionized water were added to the reaction kettle and dispersed evenly, 10 g acidic montmorillonite was added, stirred at room temperature for 9 h, washed with ethanol, and dried to obtain modified montmorillonite;

[0054] S4: In a nitrogen atmosphere, 3 g of component 1, 200 mL of tetrahydrofuran, 0.3 g of 2,2-dihydroxymethylpropionic acid, and 10 g of modified montmorillonite were added to a reaction kettle and dispersed evenly. The mixture was irradiated under ultraviolet light (365 nm) for 30 min, filtered, washed, and dried to obtain an antioxidant.

[0055] Embodiment 4 A method for preparing an environmentally friendly regeneration agent for clay pressed oil comprises the following steps:

[0056] A1: removing impurities, preheating, primary pressing and final pressing of the oily clay residue to obtain a mixed solution, allowing the mixed solution to stand and separate, taking the oil phase to obtain clay pressed oil; the specific preheating steps are: preheating the oily clay residue with water vapor to 80°C; the primary pressing pressure is 0.5MPa; the final pressing pressure is 50MPa, and the clay pressed oil is obtained;

[0057] A2: 85 parts by weight of clay pressed oil were preheated at 150°C with uniform stirring, and 5 parts by weight of dioctyl phthalate, 5 parts by weight of the antioxidant prepared in Example 1, and 5 parts by weight of hydrogenated C9 petroleum resin (softening point 100°C, molecular weight 1350, viscosity 650mPa.s at 160°C, glass transition temperature 50°C) were added in sequence, heated to 160°C, and stirred evenly at a uniform speed to obtain a clay pressed oil environmentally friendly regeneration agent.

[0058] Embodiment 5 A method for preparing an environmentally friendly regeneration agent for clay pressed oil comprises the following steps:

[0059] A1: removing impurities, preheating, primary pressing and final pressing of the oily clay residue to obtain a mixed solution, allowing the mixed solution to stand and separate, taking the oil phase to obtain clay pressed oil; the specific preheating steps are: preheating the oily clay residue with water vapor to 80°C; the primary pressing pressure is 0.5MPa; the final pressing pressure is 50MPa, and the clay pressed oil is obtained;

[0060] A2: 85 parts by weight of clay pressed oil were preheated at 150°C with uniform stirring, and 5 parts by weight of dioctyl phthalate, 5 parts by weight of the antioxidant prepared in Example 2, and 5 parts by weight of hydrogenated C9 petroleum resin (softening point 100°C, molecular weight 1350, viscosity 650mPa.s at 160°C, glass transition temperature 50°C) were added in sequence, heated to 160°C, and stirred evenly at a uniform speed to obtain a clay pressed oil environmentally friendly regeneration agent.

[0061] Example 6 A method for preparing an environmentally friendly regeneration agent for clay pressed oil comprises the following steps:

[0062] A1: removing impurities, preheating, primary pressing and final pressing of the oily clay residue to obtain a mixed solution, allowing the mixed solution to stand and separate, taking the oil phase to obtain clay pressed oil; the specific preheating steps are: preheating the oily clay residue with water vapor to 80°C; the primary pressing pressure is 0.5MPa; the final pressing pressure is 50MPa, and the clay pressed oil is obtained;

[0063] A2: 85 parts by weight of clay pressed oil were preheated at 150°C with uniform stirring, and 5 parts by weight of dioctyl phthalate, 5 parts by weight of the antioxidant prepared in Example 3, and 5 parts by weight of hydrogenated C9 petroleum resin (softening point 100°C, molecular weight 1350, viscosity 650mPa.s at 160°C, glass transition temperature 50°C) were added in sequence, heated to 160°C, and stirred evenly at a uniform speed to obtain a clay pressed oil environmentally friendly regeneration agent.

[0064] The preparation method of asphalt concrete of embodiment 7 comprises the following steps:

[0065] A1: 5 g of the clay pressed oil environmentally friendly regeneration agent prepared in Example 4 and 50 g of 90# base asphalt were heated to 165° C. and premixed to obtain component A;

[0066] A2: 2300 g of new aggregate (crushed pebbles, gradation meeting the requirements of the Technical Specification for Highway Asphalt Pavement Construction (JTG F40-2004)) and 50 g of old asphalt (the penetration of aged asphalt is 33.2 mm, the softening point is 64.3°C, the elongation at 5°C is 2.7 cm, and the viscosity at 135°C is 2.47 Pa·s) are mixed to obtain component B;

[0067] A3: Mix 55 g of component A, 2350 g of component B, and 95 g of mineral powder (granite mineral powder, 0.6 mm) to obtain asphalt concrete.

[0068] The preparation method of asphalt concrete in Example 8 comprises the following steps:

[0069] A1: 5 g of the clay pressed oil environmentally friendly regeneration agent prepared in Example 5 and 50 g of 90# base asphalt were heated to 165° C. and premixed to obtain component A;

[0070] A2: 2300 g of new aggregate (crushed pebbles, gradation meeting the requirements of the Technical Specification for Highway Asphalt Pavement Construction (JTG F40-2004)) and 50 g of old asphalt (the penetration of aged asphalt is 33.2 mm, the softening point is 64.3°C, the elongation at 5°C is 2.7 cm, and the viscosity at 135°C is 2.47 Pa·s) are mixed to obtain component B;

[0071] A3: Mix 55 g of component A, 2350 g of component B, and 95 g of mineral powder (granite mineral powder, 0.6 mm) to obtain asphalt concrete.

[0072] The preparation method of asphalt concrete in Example 9 comprises the following steps:

[0073] A1: 5 g of the clay pressed oil environmentally friendly regeneration agent prepared in Example 6 and 50 g of 90# base asphalt were heated to 165° C. and premixed to obtain component A;

[0074] A2: 2300 g of new aggregate (crushed pebbles, gradation meeting the requirements of the Technical Specification for Highway Asphalt Pavement Construction (JTG F40-2004)) and 50 g of old asphalt (the penetration of aged asphalt is 33.2 mm, the softening point is 64.3°C, the elongation at 5°C is 2.7 cm, and the viscosity at 135°C is 2.47 Pa·s) are mixed to obtain component B;

[0075] A3: Mix 55 g of component A, 2350 g of component B, and 95 g of mineral powder (granite mineral powder, 0.6 mm) to obtain asphalt concrete.

[0076] Comparative Example 1

[0077] Compared with Example 8, Comparative Example 1 only does not add the environmentally friendly regeneration agent for white clay pressed oil prepared in Example 5, and the remaining components and preparation method are completely consistent with Example 5.

[0078] Comparative Example 2

[0079] Compared with Example 8, Comparative Example 2 replaces the old asphalt added in Example 8 with new asphalt in an equal amount, and does not add the white clay pressed oil environmentally friendly regeneration agent prepared in Example 5. The remaining components and preparation method are exactly the same as those in Example 5.

[0080] The preparation method of the anti-aging agent of Comparative Example 3 comprises the following steps:

[0081] S1: Add 10g of sodium montmorillonite and 100mL of sulfuric acid solution into a reactor and disperse them evenly. Control the temperature at 70°C, keep the reaction for 12h, wash with water, and dry to obtain acidic montmorillonite.

[0082] S2: 1.2 mL 3-mercaptopropyltrimethoxysilane, 12 mL ethanol, and 0.8 mL deionized water were added to the reactor and dispersed evenly, 10 g acidic montmorillonite was added, stirred at room temperature for 6 h, washed with ethanol, and dried to obtain modified montmorillonite;

[0083] S3: 2 g of benzophenone and 10 g of modified montmorillonite were blended to obtain an anti-aging agent.

[0084] Comparative Example 4

[0085] Compared with Example 5, Comparative Example 4 only replaces the anti-aging agent prepared in Example 2 added in Example 5 with an equal amount of the anti-aging agent prepared in Comparative Example 3, and the remaining components and preparation method are completely consistent with Example 5.

[0086] Comparative Example 5

[0087] Compared with Example 5, in Comparative Example 5, only an equal amount of the anti-aging agent prepared in Example 2 added in Example 5 is replaced by benzophenone, and the remaining components and preparation method are completely consistent with those of Example 5.

[0088] Comparative Example 6

[0089] Compared with Example 8, Comparative Example 6 replaces the environmentally friendly regeneration agent for bleaching oil prepared in Example 5 added in Example 8 with an equal amount of the environmentally friendly regeneration agent for bleaching oil prepared in Comparative Example 4, and the remaining components and preparation method are exactly the same as those in Example 8.

[0090] Comparative Example 7

[0091] Compared with Example 8, Comparative Example 7 replaces the environmentally friendly regeneration agent for kaolin pressed oil prepared in Example 5 added in Example 8 with an equal amount of the environmentally friendly regeneration agent for kaolin pressed oil prepared in Comparative Example 5, and the remaining components and preparation methods are exactly the same as those in Example 8.

[0092] The preparation method of asphalt concrete of Comparative Example 8 comprises the following steps:

[0093] A1: 5 g of the clay pressed oil environmentally friendly regeneration agent prepared in Example 5 and old asphalt (the needle penetration of the aged asphalt is 33.2 mm, the softening point is 64.3° C., the elongation at 5° C. is 2.7 cm, and the viscosity at 135° C. is 2.47 Pa·s) are heated to 165° C. and premixed to obtain component A;

[0094] A2: Mix 2300g of new aggregate (crushed pebbles, with gradation meeting the requirements of the Technical Specification for Highway Asphalt Pavement Construction (JTG F40-2004)) with 50g50g of 90# base asphalt to obtain component B;

[0095] A3: Mix 55 g of component A, 2350 g of component B, and 95 g of mineral powder (granite mineral powder, 0.6 mm) to obtain asphalt concrete.

[0096] Performance Testing

[0097] (1) According to JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", the materials prepared in Examples 7-9, Comparative Examples 1-2, and Comparative Examples 6-8 were tested, including Marshall stability test, asphalt mixture rutting test, and asphalt mixture freeze-thaw splitting test. The test results are shown in Table 1;

[0098] Table 1: Statistical table of performance test data of Examples 7-9, Comparative Examples 1-2, and Comparative Examples 6-8

[0099]

[0100] As can be seen from Table 1, the clay pressed oil regeneration agent prepared in Examples 4-6 of the present application is added to asphalt concrete, and the high temperature stability and water stability of the obtained material are improved compared with Comparative Example 1 (no regeneration agent is added, old asphalt is added) and Comparative Example 2 (no regeneration agent is added, old asphalt). Among them, the addition of the clay pressed oil regeneration agent prepared in the present application improves the low temperature crack resistance of the asphalt concrete containing old asphalt by more than 26%, meeting the requirements of the Technical Specifications for Highway Asphalt Pavement Construction (JTGF40-2004). Compared with Comparative Example 8 (the regeneration agent is premixed with the old asphalt), the high temperature stability, low temperature crack resistance and water stability of the asphalt concrete prepared in Examples 7-9 of the present application are significantly improved. Compared with Comparative Examples 6-7, Examples 7-9 show that the anti-aging agent prepared by modified grafting with montmorillonite as the base material in the present application effectively improves the temperature resistance and anti-rutting performance of the material compared with the existing aging agent.

[0101] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An environmentally friendly regeneration agent for clay pressed oil, characterized in that: The raw materials include the following parts by weight: 85-95 parts by weight of clay pressed oil, 5-10 parts by weight of plasticizer, 1-5 parts by weight of anti-aging agent, and 1-5 parts by weight of tackifier; The preparation method of the anti-aging agent comprises the following steps: S1: Add 4-hydroxybenzophenone, triethylamine and dichloromethane into a reaction kettle and disperse them evenly, control the temperature at 0-5°C, add acryloyl chloride, keep the temperature for reaction for 12-18h, filter, wash with dichloromethane, wash with water, and dry to obtain component 1; S2: Add 3-mercaptopropyltrimethoxysilane, ethanol and deionized water into a reaction kettle and disperse them evenly, add acidic montmorillonite, stir at room temperature for 6-9 hours, wash with ethanol and dry to obtain modified montmorillonite; S3: In a nitrogen atmosphere, component 1, tetrahydrofuran, 2,2-dihydroxymethylpropionic acid and modified montmorillonite are added into a reaction kettle and dispersed evenly, irradiated under ultraviolet light for 15-30 minutes, filtered, washed and dried to obtain an antioxidant.

2. The environmentally friendly regeneration agent for clay pressed oil according to claim 1, characterized in that: The addition ratio of 4-hydroxybenzophenone, triethylamine, dichloromethane and acryloyl chloride in S1 is 20-30 g: 15-20 g: 200-500 mL: 10 g.

3. The environmentally friendly regeneration agent for clay pressed oil according to claim 1, characterized in that: The preparation method of the acidic montmorillonite in S2 is: adding sodium montmorillonite to a sulfuric acid solution and heating it to obtain acidic montmorillonite; the addition ratio of 3-mercaptopropyltrimethoxysilane, ethanol, deionized water, and acidic montmorillonite in S2 is 1-1.5mL:8-16mL:0.5-1mL:10g.

4. The environmentally friendly regeneration agent for clay pressed oil according to claim 1, characterized in that: The addition ratio of component 1, tetrahydrofuran, 2,2-dihydroxymethylpropionic acid and modified montmorillonite in S3 is 1-3g:100-200mL:0.1-0.3g:10g.

5. The environmentally friendly regeneration agent for clay pressed oil according to claim 1, characterized in that: The preparation method of clay pressed oil comprises the following steps: removing impurities, preheating, primary pressing and final pressing of oily clay residue to obtain a mixed liquid, allowing the mixed liquid to stand, separate, and take the oil phase to obtain clay pressed oil; the specific preheating step is to preheat the oily clay residue to 50-80° C. with water vapor; the primary pressing pressure is 0.4-0.8 MPa; and the final pressing pressure is 50-80 MPa.

6. The environmentally friendly regeneration agent for clay pressed oil according to claim 1, characterized in that: The plasticizer is one or more of dioctyl phthalate and dioctyl sebacate mixed in any ratio; the tackifier is one or more of C5 petroleum resin, hydrogenated C9 petroleum resin and rosin resin mixed in any ratio.

7. The use of the environmentally friendly regeneration agent of clay pressed oil in asphalt concrete according to any one of claims 1 to 6, characterized in that: The application is specifically: adding the clay pressed oil environmentally friendly regeneration agent into the asphalt concrete containing old asphalt; The preparation method of the asphalt concrete comprises the following steps: A1: Heat and premix the clay pressed oil environmentally friendly regeneration agent with new asphalt to obtain component A; A2: Mix new aggregate with old asphalt to obtain component B; A3: Mix component A, component B and mineral powder to obtain asphalt concrete.

8. The use of the environmentally friendly regeneration agent of clay pressed oil in asphalt concrete according to claim 7, characterized in that: Clay press oil regeneration agent accounts for 5-15% of the old asphalt mass.

9. The use of the environmentally friendly regeneration agent of clay pressed oil in asphalt concrete according to claim 7, characterized in that: The mass ratio of new asphalt to old asphalt in the asphalt concrete is 1:1-3, and the sum of the mass of the new asphalt and the old asphalt accounts for 3.5-4.5% of the total mass of the asphalt concrete.

10. The use of the environmentally friendly regeneration agent of clay pressed oil in asphalt concrete according to claim 7, characterized in that: The new aggregate accounts for 90-94% of the total mass of the asphalt concrete; the mineral powder accounts for 2-5% of the total mass of the asphalt concrete.

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