Reclaimed oil-based asphalt regenerant as well as preparation method and application thereof

Abstract

The invention discloses a regenerated oil-based asphalt regenerant as well as a preparation method and application thereof, and belongs to the technical field of road engineering regenerated asphalt. The regenerant comprises the following components in parts by weight: regenerated oil, matrix asphalt, a composite plasticizer, a penetrant, an anti-aging agent and a flame retardant, the regenerated oil comprises waste mineral oil and waste edible oil; the composite plasticizer comprises a component A and a component B, wherein the component A comprises a hydrocarbon-terpene resin compound system, ethyl benzoate and hydrogenated soybean oil; the hydrocarbon-terpene resin compound system comprises cycloalkane, alkylated aromatic hydrocarbon and terpene resin; the component B comprises polyethylene glycol and amino silane; the penetrating agent is glyceryl monopalmitate; the anti-aging agent is prepared from tert-butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide. The regenerant provided by the invention can endow regenerated asphalt with excellent high-temperature stability, anti-aging performance and permeation regeneration effect, and meanwhile, the flash point of the regenerant is remarkably improved, so that the construction safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of road engineering recycled asphalt, and particularly relates to a recycled oil-based asphalt regenerant, a preparation method and application thereof. BACKGROUND

[0003] When the asphalt pavement produces rutting, cracking, potholes, and other diseases, the main form of maintenance and repair is to mill and mill the original surface layer, and then to repave and roll to form a new asphalt mixture surface layer to restore the road use function. A large amount of waste asphalt pavement recycling material (RAP material) is generated during the milling of the old asphalt pavement, which mainly consists of mineral aggregates with excellent quality and aged asphalt wrapped on the surface of the mineral aggregates.

[0004] Due to the high degree of aging of the asphalt in the RAP material, it exhibits hard and brittle characteristics compared to unaged asphalt. Using too much can cause low-temperature and fatigue cracking of the pavement, reducing the road performance. Therefore, the recycling specification generally stipulates that the RAP material blending ratio in the plant-mixed hot recycled asphalt mixture mix design is 15%-30%. Currently, in order to improve the utilization rate of RAP material and achieve sustainable development of transportation, scholars and construction enterprises have introduced high-mix RAP material, which means not only improving the design and construction process, but also improving the recycling performance of the asphalt regenerant. The asphalt regenerant plays an increasingly important role. Currently, the quality of asphalt regenerants on the market is uneven, with high cost, unsatisfactory recycling effect, poor anti-aging performance and long-term stability, etc., which to some extent limits the use of high-mix RAP material.

[0005] The current bottleneck of asphalt regenerant mainly lies in: (1) the single source or high cost of the core component (such as regenerative oil) of the regenerant; (2) the softening, component supplementing and anti-aging performance of the regenerant are insufficient, which limits the high-mix RAP; (3) the high-temperature stability, long-term durability and construction safety (such as low flash point) of the regenerant need to be improved; (4) the production process is complex or the cost lacks competitiveness. Therefore, developing an asphalt regenerant that can efficiently utilize waste materials, has excellent recycling performance, stable comprehensive performance and low cost is a key technical requirement for promoting the application of high-mix RAP and realizing the green and low-carbon development of road engineering. SUMMARY

[0006] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a recycled oil-based asphalt regenerant, which can efficiently utilize waste oil resources, impart excellent high-temperature stability, anti-aging performance and penetration regeneration effect to the recycled asphalt, and significantly improve the flash point of the regenerant to ensure construction safety, especially for plant-mixed hot recycled asphalt mixture with RAP material blending ratio greater than 30%.

[0007] To achieve the above object, the specific technical solutions of the present application are as follows:

[0008] The regenerating oil-based asphalt regenerating agent comprises the following components in parts by weight: 60-85 parts of regenerating oil, 1-9 parts of base asphalt, 15-25 parts of composite plasticizer, 1-10 parts of penetrating agent, 2-3 parts of anti-aging agent, and 1-5 parts of flame retardant.

[0009] The regenerating oil comprises waste mineral oil and waste edible oil.

[0010] The composite plasticizer comprises A component and B component, the A component comprises a hydrocarbon-terpene resin compound system, ethyl benzoate and hydrogenated soybean oil, the hydrocarbon-terpene resin compound system comprises naphthenes, alkylated aromatics and terpene resin, and the B component comprises polyethylene glycol and amino silane.

[0011] The penetrating agent is glyceryl monopalmitate.

[0012] The anti-aging agent comprises tertiary butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide.

[0013] In the asphalt regenerating agent, the composite plasticizer adopts an A / B component composite system, the hydrocarbon-terpene resin compound system in the A component not only can penetrate the aged asphalt and supplement the light components, but also can reduce the glass transition temperature of the asphalt, improve the regenerating durability, the ethyl benzoate plays a plasticizing role, the hydrogenated soybean oil provides lubrication and auxiliary plasticizing, the polyethylene glycol in the B component improves the low-temperature plasticity, and the amino silane enhances the binding force and durability with the asphalt and aggregate, under the interaction of the A / B components, the aged asphalt is effectively softened and restored in plasticity, and the high-temperature stability and long-term durability of the regenerated asphalt mixture are significantly improved. The penetrating agent glyceryl monopalmitate has excellent compatibility with the asphalt system, good high-temperature stability, can effectively reduce the interfacial tension and promote penetration in an oily environment, is stable in long-term storage and not prone to delamination, and can promote the regenerated agent to quickly penetrate into the aged asphalt to play a role. The anti-aging agent composed of tertiary butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide can significantly improve the anti-light and thermal oxidation aging performance of the regenerated asphalt mixture, simultaneously plays a role in repairing aging damage and enhancing structural stability, and realizes the trinity protection effect of "prevention, blockage and repair". The asphalt regenerating agent uses waste mineral oil and waste edible oil as the core regenerating oil base material, combines the optimized composite plasticizer, efficient penetrating agent and anti-aging agent, significantly improves the comprehensive performance of the regenerated agent, and especially solves the key performance bottleneck in the regeneration of high-mixing RAP.

[0014] Preferably, the mass ratio of the hydrocarbon-terpene resin compound system, ethyl benzoate and hydrogenated soybean oil is (1-2):(0.5-0.7):(1-3).

[0015] Preferably, the mass ratio of the polyethylene glycol and the amino silane is (1-5):(2-3).

[0016] Preferably, the mass ratio of the tert-butyl hydroxy anisole, the phenyl benzimidazolone and the dicumyl peroxide is (1-1.2):(1.5-2):(0.1-0.3).

[0017] Preferably, the mass ratio of the cycloalkane, the alkylated aromatic hydrocarbon and the terpene resin is (6-7):(2-3):(0.5-1).

[0018] Further preferably, the cycloalkane is a hydrogenated light cycloalkane oil, the kinematic viscosity of the hydrogenated light cycloalkane oil at 40℃ is 50-150 mm 2 / s, and the flash point is not lower than 200℃.

[0019] Preferably, the waste mineral oil comprises at least one of waste engine oil, waste hydraulic oil, waste transformer oil, waste gearbox oil, waste solvent oil and waste lubricating oil.

[0020] Preferably, the waste edible oil comprises at least one of waste peanut oil, waste soybean oil, waste rapeseed oil, waste olive oil, waste hot pot oil and waste swill oil.

[0021] Preferably, the flame retardant comprises at least one of melamine phosphate, decabromodiphenyl ether, polyaniline and aluminum hydroxide.

[0022] Another object of the present application is to provide a preparation method of the reclaimed oil-based asphalt regenerant, comprising the following steps:

[0023] S1. Pre-treating the reclaimed oil;

[0024] S2. Mixing the reclaimed oil obtained in step S1 with base asphalt, composite plasticizer, penetrating agent and anti-aging agent, heating to 130-135℃, stirring at a stirring rate of 400-500 r / min for 15-20 min, adding flame retardant after cooling, and uniformly mixing to obtain the reclaimed oil-based asphalt regenerant.

[0025] Preferably, step S1 comprises the following operations: preheating the waste mineral oil and the waste edible oil respectively, dehydrating at 120-180℃ under stirring at 500-600 r / min for 20-30 min, and then removing impurities and residues by microfiltration extraction and filtration respectively to obtain pre-treated waste mineral oil and pre-treated waste edible oil; and then mixing the two to obtain the reclaimed oil.

[0026] Still another object of the present application is to provide application of the reclaimed oil-based asphalt regenerant in plant-mixed hot recycled asphalt mixture, and the addition amount of the reclaimed oil-based asphalt regenerant is 6%-12% of the weight of waste asphalt mixture.

[0027] Compared with the prior art, the present application has the advantages of:

[0028] (1) The present application can effectively soften the aged asphalt and restore its plasticity, and significantly improve the high-temperature stability and long-term durability of the recycled asphalt mixture by adding a composite plasticizer composed of A / B components into the recycling agent; the recycling agent can quickly penetrate into the aged asphalt to play a role by adding glycerol monopalmitate as a penetrating agent; the anti-thermal-oxidative aging, ultraviolet aging capacity and structural stability of the recycled asphalt are significantly improved by adding a anti-aging agent composed of tertiary butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide; under the interaction of the above components, the comprehensive performance of the recycling agent is significantly improved, especially the key performance bottleneck in the recycling of high-dosage RAP is solved.

[0029] (2) The recycling agent of the present application uses waste mineral oil and waste edible oil as the core recycling oil base material, the waste mineral oil is rich in saturated hydrocarbons and aromatic hydrocarbons, which can effectively supplement the missing oil and light components of the aged asphalt; the waste edible oil contains long-chain fatty acid esters, which has good plasticizing, lubricating and penetrating effect; the two complement each other, overcoming the shortcomings of single waste oil (such as poor compatibility of waste mineral oil and weak high-temperature stability of waste edible oil), providing excellent penetrating and recycling ability and basic stability for the recycling agent. At the same time, the two kinds of waste resources are fully utilized, which is environmentally friendly and significantly reduces the cost.

[0030] (3) In the preparation method of the present application, the flame retardant is added after mixing, stirring and cooling, which effectively avoids the potential decomposition, volatilization or reaction failure of the flame retardant (especially organic flame retardant) during high-temperature stirring at 130~135℃, ensuring the flame retardant efficiency. More importantly, this process significantly improves the flash point of the recycling agent, greatly ensuring the safety of the production, storage and construction process. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The preparation flow chart of the recycling oil-based asphalt recycling agent of the present application is shown in the figure. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] A recycling oil-based asphalt recycling agent, comprising the following components in the following weight proportions: recycling oil 60~85 parts, base asphalt 1~9 parts, composite plasticizer 15~25 parts, penetrating agent 1~10 parts, anti-aging agent 2~3 parts, flame retardant 1~5 parts.

[0034] The reclaimed oil includes waste mineral oil and waste edible oil;

[0035] The composite plasticizer includes an A component and a B component, the A component includes a hydrocarbon-terpene resin compound system, ethyl benzoate and hydrogenated soybean oil with a mass ratio of (1-2):(0.5-0.7):(1-3), the hydrocarbon-terpene resin compound system includes naphthenes, alkylated aromatics and terpene resin, and the B component includes polyethylene glycol and amino silane with a mass ratio of (1-5):(2-3);

[0036] The penetrating agent is glycerol monopalmitate;

[0037] The anti-aging agent includes tertiary butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide with a mass ratio of (1-1.2):(1.5-2):(0.1-0.3).

[0038] In the present application, the waste mineral oil can be selected from any one of waste engine oil, waste hydraulic oil, waste transformer oil, waste gearbox oil, waste solvent oil and waste lubricating oil, and the waste edible oil can be selected from any one of waste peanut oil, waste soybean oil, waste rapeseed oil, waste olive oil, waste hot pot oil and waste swill oil; the following examples and comparative examples are only exemplified by waste engine oil and waste peanut oil. The hydrogenated light naphthenic oil used in the present application is a naphthenic mineral oil subjected to deep hydrorefining, the kinematic viscosity at 40 DEG C is about 100 mm2 / s, the flash point is about 220 DEG C, and the aromatic content is less than 1.5wt%.

[0039] Example 1

[0040] The present embodiment provides a reclaimed oil-based asphalt regenerant, which includes the following components in weight percentage: 60 parts of reclaimed oil, 1 part of base asphalt, 15 parts of composite plasticizer, 1 part of penetrating agent, 2 parts of anti-aging agent and 1 part of flame retardant;

[0041] The reclaimed oil is obtained by mixing waste mineral oil and waste edible oil with a mass ratio of 2:1;

[0042] The base asphalt is 90# road petroleum asphalt;

[0043] The plasticizer includes an A component and a B component, and the A component:B component = 3:1;

[0044] The A component is compounded by a hydrocarbon-terpene resin compound system, ethyl benzoate and hydrogenated soybean oil with a mass ratio of 1:0.5:1, wherein the hydrocarbon-terpene resin compound system is compounded by hydrogenated light naphthenic oil, C 14 linear alkylbenzene and hydrogenated beta-pinene resin with a mass ratio of 6:2:0.5;

[0045] The B component is compounded by polyethylene glycol and 3-aminopropyl triethoxysilane at a mass ratio of 1:2;

[0046] The penetrating agent is glyceryl monopalmitate;

[0047] The anti-aging agent is compounded by tert-butyl hydroxyanisole, phenyl benzimidazolone and dicyclohexyl peroxide at a mass ratio of 1:1.5:0.1;

[0048] The flame retardant is melamine phosphate;

[0049] The preparation method of the regenerated oil-based asphalt regenerant of the embodiment comprises the following steps:

[0050] S1. The waste mineral oil and waste edible oil are respectively preheated, dehydrated at 150℃ with stirring at 500r / min for 20min to remove the water in the two waste oils, and then extracted and filtered through a 2μm microporous filter to remove impurities and residues, to obtain pretreated waste mineral oil and pretreated waste edible oil; then the two are mixed to obtain regenerated oil;

[0051] S2. The treated regenerated oil is heated, stirred and cooled with matrix asphalt, plasticizer, penetrating agent and anti-aging agent, the heating temperature is 130℃, the stirring time is 15min, and the stirring rate is 400r / min;

[0052] S3. The corresponding flame retardant is added to the cooled liquid asphalt regenerant, and mixed uniformly to obtain the regenerated oil-based asphalt regenerant.

[0053] Example 2

[0054] The embodiment provides a regenerated oil-based asphalt regenerant, which comprises the following components in parts by weight: regenerated oil 70 parts, matrix asphalt 5 parts, composite plasticizer 20 parts, penetrating agent 5 parts, anti-aging agent 3 parts, and flame retardant 3 parts;

[0055] The regenerated oil is compounded by waste mineral oil and waste edible oil at a mass ratio of 2:1;

[0056] The matrix asphalt is 90# road petroleum asphalt;

[0057] The plasticizer comprises A component and B component, and the A component:B component is 3:1;

[0058] The A component is compounded by a hydrocarbon-terpene resin compounded system, ethyl benzoate and hydrogenated soybean oil at a mass ratio of 2:0.6:2, wherein the hydrocarbon-terpene resin compounded system is compounded by hydrogenated light naphthenic oil, C 14 The linear alkylbenzene and hydrogenated beta-pinene resin are compounded at a mass ratio of 7:3:1;

[0059] The B component is compounded by polyethylene glycol and N-beta-aminoethyl-gamma-aminopropyl trimethoxysilane at a mass ratio of 3:3;

[0060] The penetrating agent is glyceryl monopalmitate;

[0061] The anti-aging agent is compounded by tert-butyl hydroxyanisole, phenyl benzimidazolone and dicyclohexyl peroxide at a mass ratio of 1.2:1.5:0.2;

[0062] The flame retardant is decabromodiphenyl ether;

[0063] The preparation method of the regenerated oil-based asphalt regenerant of the embodiment comprises the following steps:

[0064] S1. The waste mineral oil and waste edible oil are respectively preheated, dehydrated at 150℃ with stirring at 550r / min for 25min to remove the water in the two waste oils, and then extracted and filtered through a 2μm microporous filter to remove impurities and residues, to obtain pretreated waste mineral oil and pretreated waste edible oil; then the two are mixed to obtain regenerated oil;

[0065] S2. The treated regenerated oil is heated, stirred and cooled with matrix asphalt, plasticizer, penetrating agent and anti-aging agent, the heating temperature is 135℃, the stirring time is 20min, and the stirring rate is 450r / min;

[0066] S3. The corresponding flame retardant is added to the cooled liquid asphalt regenerant, and mixed uniformly to obtain the regenerated oil-based asphalt regenerant.

[0067] Example 3

[0068] The embodiment provides a regenerated oil-based asphalt regenerant, which comprises the following components in parts by weight: 85 parts of regenerated oil, 9 parts of matrix asphalt, 25 parts of composite plasticizer, 8 parts of penetrating agent, 3 parts of anti-aging agent, and 5 parts of flame retardant;

[0069] The regenerated oil is compounded by waste mineral oil and waste edible oil at a mass ratio of 2:1;

[0070] The matrix asphalt is 90# road petroleum asphalt;

[0071] The plasticizer comprises A component and B component, and the A component:B component is 3:1;

[0072] The A component is compounded by a hydrocarbon-terpene resin compounded system, ethyl benzoate and hydrogenated soybean oil at a mass ratio of 2:0.7:3, wherein the hydrocarbon-terpene resin compounded system is compounded by hydrogenated light naphthenic oil, C 14 The linear alkylbenzene and hydrogenated beta-pinene resin are compounded at a mass ratio of 6:2:0.5;

[0073] The B component is compounded by polyethylene glycol and 3-aminopropyl triethoxysilane at a mass ratio of 5:3;

[0074] The penetrating agent is glyceryl monopalmitate;

[0075] The anti-aging agent is compounded by tert-butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide at a mass ratio of 1.2:2:0.3;

[0076] The flame retardant is aluminum hydroxide;

[0077] The preparation method of the regenerated oil-based asphalt regenerant of the embodiment comprises the following steps:

[0078] S1. The waste mineral oil and waste edible oil are respectively preheated, dehydrated at 150 DEG C with stirring at 600 r / min for 30 min to remove the water in the two waste oils, and then extracted and filtered through a 2 mu m microporous filter membrane to remove impurities and residues, to obtain pretreated waste mineral oil and pretreated waste edible oil; then the two are mixed to obtain regenerated oil;

[0079] S2. The treated regenerated oil is heated, stirred and cooled with base asphalt, plasticizer, penetrating agent and anti-aging agent, the heating temperature is 135 DEG C, the stirring time is 20 min, and the stirring rate is 500 r / min;

[0080] S3. The corresponding flame retardant is added to the cooled liquid asphalt regenerant, and mixed uniformly to obtain the regenerated oil-based asphalt regenerant.

[0081] Comparative Example 1

[0082] The regenerated oil-based asphalt regenerant of Comparative Example 1 is basically the same as that of Example 1, except that the A component of the plasticizer is compounded by ethyl benzoate and hydrogenated soybean oil at a mass ratio of 1.5:1.

[0083] That is, compared with Example 1, the A component of the plasticizer used in the present comparative example lacks a hydrocarbon-terpene resin compounding system, and the amount of ethyl benzoate is correspondingly increased to keep the total amount unchanged.

[0084] Comparative Example 2

[0085] The regenerated oil-based asphalt regenerant of Comparative Example 2 is basically the same as that of Example 1, except that the B component of the plasticizer used in the present comparative example is omitted.

[0086] Comparative Example 3

[0087] The regenerated oil-based asphalt regenerant of Comparative Example 3 is basically the same as that of Example 1, except that the penetrating agent used in the present comparative example is polyoxyethylene ether.

[0088] Comparative Example 4

[0089] The reclaimed oil-based asphalt rejuvenator of Comparative Example 4 is basically the same as that of Example 1, except that the anti-aging agent used in the present comparative example is nano-montmorillonite.

[0090] Comparative Example 5

[0091] The reclaimed oil-based asphalt rejuvenator of Comparative Example 5 is basically the same as that of Example 1, except that the anti-aging agent used in the present comparative example is tert-butyl hydroxy anisole.

[0092] According to the technical requirements of asphalt rejuvenator in the Technical Specification for Highway Asphalt Pavement Recycling (JTG / T 5521-2019), the indicators of the reclaimed oil-based asphalt rejuvenators produced in Examples 1-3 and Comparative Examples 1-5 were detected by using the relevant test methods, and the test conditions are as follows:

[0093] Technical index test of asphalt rejuvenator

[0094] (1) Detection instrument

[0095] Asphalt standard viscometer (Shanghai Fangrui Instrument Co., Ltd.), asphalt flash point and ignition point tester (Cleveland open cup method) (Yu Zhan Instrument and Equipment (Cangzhou) Co., Ltd.), asphalt quality extractor, vacuum drying box (Zhengzhou Yuhua Instrument Manufacturing Co., Ltd.), asphalt film heating oven (Tianjin Huida Experimental Instrument Co., Ltd.).

[0096] (2) Detection method

[0097] According to the relevant test methods in the Technical Specification for Highway Asphalt Pavement Recycling (JTG / T 5521-2019), the detection was carried out.

[0098] (3) Detection results

[0099] The detection results are shown in Table 1.

[0100] Table 1 Detection results of reclaimed oil-based asphalt rejuvenator

[0101]

[0102] From the data in Table 1, it can be seen that the reclaimed oil-based asphalt rejuvenator prepared according to the material ratio of the present application meets the specification requirements in terms of various technical indicators except that the flash point in Comparative Example 1 does not meet the specification requirements.

[0103] It can be found by comparing Example 1 and Comparative Example 1 that, in Comparative Example 1, the hydrocarbon-terpene resin compounding system is omitted, even if the amount of ethyl benzoate is increased accordingly, the 60℃ viscosity of the rejuvenator, the lightning significantly decreases, the aromatic content slightly increases, and the viscosity ratio before and after the film oven test and the mass change after the film oven test also significantly increases, because the hydrocarbon-terpene resin compounding system has a relatively high viscosity, and the flash point and viscosity of ethyl benzoate are relatively low and have a relatively high volatility.

[0104] The rejuvenators in Examples 1-3 and Comparative Examples 2-5 above were mixed at a mixing ratio of 6%, 8%, and 10%, and asphalt rejuvenation tests were carried out on the same kind of aged asphalt, and the rejuvenation effects were evaluated by the penetration, softening point, 10℃ ductility, 135℃ Brookfield viscosity, and penetration ratio tests.

[0105] (1) Test instruments

[0106] Asphalt penetration tester (Hewei Ruipu Instrument and Meter Co., Ltd.), softening point tester (Beijing Aerospace Science and Technology Test Instrument Co., Ltd.), asphalt ductility tester (Hebei Zhongyi Weichuang Test Instrument Co., Ltd.), Brookfield viscometer (Shanghai Changji Geological Instrument Co., Ltd.).

[0107] (2) Test method

[0108] Aged asphalt was prepared by the asphalt film oven test, and Examples 1-3 were added to the aged asphalt at a mixing ratio of 0%, 6%, 8%, and 10%, and the penetration, softening point, ductility, and Brookfield viscosity values of the aged asphalt at different rejuvenator contents were determined to evaluate the rejuvenation effect of the rejuvenator.

[0109] (3) Test results

[0110] The test results are shown in Table 2.

[0111] Table 2 Rejuvenation test results of the rejuvenated oil-based asphalt rejuvenator

[0112]

[0113] As can be seen from the data in Table 2, the rejuvenated oil-based asphalt rejuvenator prepared by Examples 1-3 has a significant rejuvenation effect on aged asphalt, and the penetration, softening point, ductility, and Brookfield viscosity of the aged asphalt with the rejuvenator are effectively restored, and with the increase of the rejuvenator content, the indicators of the rejuvenated asphalt are continuously improved, which shows that the rejuvenated oil-based asphalt rejuvenator has a good rejuvenation effect and can be used for the production and construction of hot mix asphalt mixture with a large amount of RAP (more than 30%) in road engineering.

[0114] Compared with Example 1, the plasticizer used in Comparative Example 2 omits the B component, and the test results show that under the same amount of rejuvenator, the penetration index increases, the softening point, 10℃ ductility, 135℃ Brookfield rotational viscosity and penetration ratio all decrease, mainly because after the omission of the B component, the viscosity of the rejuvenator decreases and the oily component increases, and the polyethylene glycol in the B component has a high viscosity and helps to improve the elastic toughness and anti-aging property together with 3-aminopropyl triethoxysilane.

[0115] Compared with Example 1, Comparative Example 3 replaces the penetrant glycerol monopalmitate with polyoxyethylene ether while keeping the amount of penetrant unchanged, and the test results show that the effect of the reclaimed asphalt of Comparative Example 2 is not as good as that of Example 1, because the penetration and diffusion capacity and high-temperature stability of the traditional penetrant polyoxyethylene ether in asphalt are not as good as those of glycerol monopalmitate, resulting in uneven action of the rejuvenator and decreased performance recovery efficiency.

[0116] Compared with Example 1, Comparative Example 4 replaces the anti-aging agent composed of tert-butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide with nano-montmorillonite, and the test results show that the rejuvenation effect is still not as good as that of Example 1, indicating that compared with the conventional anti-aging agent nano-montmorillonite, the anti-aging agent composed of tert-butyl hydroxy anisole, phenyl benzimidazolone and dicyclohexyl peroxide of the present application can significantly improve the anti-light and thermal oxidation aging performance of the reclaimed asphalt mixture, while repairing the aging damage and enhancing the structural stability, because nano-montmorillonite only provides physical filling and barrier effect and cannot provide chemical anti-aging effect.

[0117] Compared with Example 1, Comparative Example 5 uses tert-butyl hydroxy anisole as the anti-aging agent and omits phenyl benzimidazolone and dicyclohexyl peroxide, and the test results show that the penetration, 10℃ ductility and 135℃ Brookfield rotational viscosity of the reclaimed asphalt slightly increase, the softening point slightly decreases, and the penetration ratio significantly decreases, because when the anti-aging agent only uses tert-butyl hydroxy anisole, the aromatic content of the asphalt rejuvenator increases and the anti-aging performance decreases.

[0118] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A recycled oil-based asphalt regenerator, characterized in that, It includes the following components in parts by weight: 60-85 parts recycled oil, 1-9 parts base bitumen, 15-25 parts composite plasticizer, 1-10 parts penetrant, 2-3 parts anti-aging agent, and 1-5 parts flame retardant; Recycled oil includes waste mineral oil and waste edible oil; The composite plasticizer comprises component A and component B. Component A comprises a hydrocarbon-terpene resin compound system, ethyl benzoate, and hydrogenated soybean oil. The hydrocarbon-terpene resin compound system comprises cycloalkanes, alkylated aromatics, and terpene resins. Component B comprises polyethylene glycol and aminosilane. The penetrant is glyceryl monopalmitate; The anti-aging agents include tert-butylhydroxyanisole, phenylbenzimidazole, and dicyclohexyl peroxide.

2. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The mass ratio of the hydrocarbon-terpene resin compound system, ethyl benzoate, and hydrogenated soybean oil is (1~2):(0.5~0.7):(1~3).

3. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The mass ratio of polyethylene glycol to aminosilane is (1~5):(2~3).

4. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The mass ratio of the tert-butylhydroxyanisole, phenylbenzimidazole and dicyclohexyl peroxide is (1~1.2):(1.5~2):(0.1~0.3).

5. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The mass ratio of the cycloalkanes, alkylated aromatics and terpene resins is (6~7):(2~3):(0.5~1).

6. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The waste mineral oil includes at least one of waste engine oil, waste hydraulic oil, waste transformer oil, waste transmission oil, waste solvent oil, and waste lubricating oil; And / or, the waste cooking oil includes at least one of waste peanut oil, waste soybean oil, waste rapeseed oil, waste olive oil, waste hot pot oil, and waste swill oil.

7. The recycled oil-based asphalt regenerator according to claim 1, characterized in that, The flame retardant includes at least one of melamine phosphate, decabromodiphenyl ether, polyaniline, and aluminum hydroxide.

8. A method for preparing a recycled oil-based asphalt regenerator according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Recycled oil undergoes pretreatment; S2. The recycled oil obtained in step S1 is mixed with base asphalt, composite plasticizer, penetrant and anti-aging agent, heated to 130~135℃, stirred at a stirring rate of 400~500r / min for 15~20min, cooled and then flame retardant is added. After mixing evenly, the recycled oil-based asphalt recycling agent is obtained.

9. The method for preparing a recycled oil-based asphalt regenerator according to claim 8, characterized in that, Step S1 includes the following operations: preheating waste mineral oil and waste edible oil separately, dehydrating them by stirring at 500-600 r / min for 20-30 min at 120-180℃, and then removing impurities and residues by extraction and filtration through a microporous membrane to obtain pretreated waste mineral oil and pretreated waste edible oil; then mixing the two to obtain the recycled oil.

10. The application of the recycled oil-based asphalt regenerator according to any one of claims 1 to 7 in plant-mixed hot recycled asphalt mixtures, characterized in that, The amount of the recycled oil-based asphalt regenerator added is 6% to 12% of the weight of the waste asphalt mixture.

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