A weather-resistant asphalt pavement regeneration agent and preparation method thereof

Abstract

The present invention relates to a weather-resistant asphalt pavement regeneration agent and a preparation method thereof. Existing asphalt pavement regeneration agents have the problems of being unable to repair the molecular structure of waste asphalt, being relatively high in cost, having poor weather resistance, and having poor stability. The weather-resistant asphalt pavement regeneration agent of the present invention is prepared from the following components in parts by weight: waste engine oil, a diluent, a plasticizer, and an aromatic oil. When preparing the asphalt pavement regeneration agent of the present invention, an active diluent containing an epoxy group is added to effectively repair the molecular structure of waste asphalt and restore the original performance of asphalt; waste engine oil is used as the base oil component to reduce the manufacturing cost; an epoxy resin plasticizer having both weather resistance and stability is added to effectively absorb the by-products generated in the asphalt aging process, which can not only improve the stability of the regeneration agent, but also effectively enhance the durability of the regenerated asphalt; a certain amount of aromatic oil is added to supplement the aromatic components in the waste asphalt, effectively improving the viscosity, toughness, and high temperature resistance of the regenerated asphalt.

Description

Technical Field

[0001] The invention relates to the technical field of road materials, and in particular to a weather-resistant asphalt pavement regeneration agent and a preparation method thereof. Background Art

[0002] Asphalt pavement has received widespread attention and use due to its excellent performance. With the continuous advancement of highway asphalt pavement construction, some asphalt pavements have gradually aged to varying degrees and gradually entered the maintenance period, which resulted in a large amount of waste asphalt mixture. How to reasonably utilize waste asphalt mixture to reduce environmental pollution and resource waste, while saving road maintenance costs, has become a common concern of road workers, and the recycling of waste asphalt has also become a hot topic.

[0003] Many road technical workers are constantly exploring and developing different asphalt pavement regeneration agents in order to effectively solve technical problems such as the regeneration of waste asphalt, the effective integration of new and old asphalt, and the increase of the amount of waste asphalt mixture. Therefore, a variety of asphalt pavement regeneration agents continue to emerge, most of which have the following problems, which have limited their promotion and application. The main manifestations are: First, the regeneration agent is directly compounded based on the loss components of waste asphalt, resulting in a generally high cost of such products, and it cannot effectively repair the molecular structure of asphalt broken due to aging; second, excessive attention is paid to the increase in the amount of waste asphalt and the weather resistance of the asphalt regeneration agent is ignored, resulting in poor durability of such regeneration agents; third, some asphalt regeneration agents prepared with waste engine oil or waste cooking oil have poor stability, resulting in poor use effect. Therefore, it is urgent to develop new asphalt pavement regeneration agents to overcome the problems of the existing technology that cannot repair the molecular structure of waste asphalt, high cost, poor weather resistance, and poor stability. Summary of the invention

[0004] The purpose of the present invention is to provide a weather-resistant asphalt pavement regeneration agent and a preparation method thereof, so as to solve the problems existing in the existing asphalt pavement regeneration agent, such as the inability to repair the molecular structure of waste asphalt, high cost, poor weather resistance, poor stability, etc.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A weather-resistant asphalt pavement regeneration agent, the weather-resistant asphalt pavement regeneration agent is prepared from the following components in parts by weight:

[0007] 60-75 parts of waste engine oil;

[0008] 2 to 6 parts of diluent;

[0009] 5-8 parts of plasticizer;

[0010] 15-25 parts of aromatic oil.

[0011] Furthermore, the diluent is a reactive diluent containing an epoxy group, selected from C12-14 alkyl glycidyl ether, phenyl glycidyl ether, and benzyl glycidyl ether.

[0012] Furthermore, the plasticizer is an epoxy lipid plasticizer selected from epoxy soybean oil, epoxy fatty acid butyl ester, and epoxy fatty acid octyl ester.

[0013] In addition, a method for preparing a weather-resistant asphalt pavement regeneration agent as described above is provided, the method comprising:

[0014] The waste oil is filtered for the first time, heated and distilled under reduced pressure, stirred and kept warm, and filtered for the second time after cooling to room temperature to obtain pure base oil;

[0015] The pure base oil is heated and stirred, a diluent is added, the plasticizer is added after the mixture is stirred and cooled;

[0016] Aromatic oil is added, stirred and then cooled to obtain a weather-resistant asphalt pavement regeneration agent.

[0017] Furthermore, the waste oil is filtered for the first time, heated and distilled under reduced pressure, kept warm and stirred, cooled to room temperature and filtered for the second time to obtain pure base oil, including:

[0018] The waste oil is filtered for the first time using a 3.0 μm microporous filter membrane;

[0019] Carry out vacuum distillation at 120℃~150℃, and keep stirring for 1h~2h;

[0020] After cooling to room temperature, the second filtration is performed using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0021] Further, the purified base oil is heated and stirred, a diluent is added, a plasticizer is added after the temperature is maintained and stirred, and the mixture is stirred and cooled, including:

[0022] Heat the pure base oil, gradually increasing the temperature while stirring constantly;

[0023] After reaching 90℃~120℃, slowly add diluent;

[0024] After keeping warm and stirring for 0.5h to 1h, slowly add the plasticizer;

[0025] After stirring for 30 to 40 minutes, gradually lower the temperature to 55 to 70 degrees Celsius.

[0026] Further, aromatic oil is added, stirred and then cooled to obtain a weather-resistant asphalt pavement regeneration agent, including:

[0027] Gradually add aromatic oil;

[0028] After stirring for 10 to 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) When preparing the asphalt pavement regeneration agent of the present invention, a certain amount of active diluent containing epoxy groups is added to effectively repair the molecular structure of waste asphalt, especially the breakage of unsaturated bonds in modified asphalt, thereby effectively restoring the original performance of asphalt.

[0031] (2) The asphalt pavement regeneration agent prepared by the present invention uses waste engine oil as the base oil component. The raw material is easy to obtain and has good solubility with other components. The preparation process is simple, which greatly reduces the manufacturing cost of the asphalt pavement regeneration agent and also recycles the waste engine oil.

[0032] (3) During the preparation of the asphalt pavement regeneration agent of the present invention, a plasticizer with both weather resistance and stability is added, which can effectively absorb the by-products generated in the asphalt aging process, thereby not only improving the stability of the regeneration agent, but also effectively improving the durability of the regenerated asphalt.

[0033] (4) In addition, during the preparation of the asphalt pavement regeneration agent of the present invention, a certain amount of aromatic oil is added to supplement the aromatic components in the waste asphalt, thereby effectively improving the viscosity, toughness and high temperature resistance of the regenerated asphalt. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. Preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] In the description of the present invention, it is to be understood that all the techniques and scientific terms used have the same meanings as those generally understood by those of ordinary skill in the art to which the present invention belongs. When there is a contradiction, the definition in this specification shall prevail. If not otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art, the reagents used in the embodiments are commercially available products, and the devices used in the embodiments are existing devices, and the limitation of means, reagents or devices cannot be understood as limitation of the present invention, and the means, reagents or devices for solving the same technical problems of the same type are within the protection scope of the present invention.

[0036] In the description of the present invention, it is to be understood that when an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0037] In the description of the present invention, it should be understood that multiple steps are involved in the process of describing the method, which should not be understood as a limitation on the order of the method steps. When solving the same technical problem, the technical solution obtained by only changing the order of the steps is also within the scope of protection of the present invention.

[0038] The present invention provides a weather-resistant asphalt pavement regeneration agent, which uses waste engine oil as a base oil component, is compounded with a plasticizer having both weather resistance and stability, and is supplemented with a diluent that can effectively repair the molecular structure of waste asphalt, and an aromatic oil that can improve the viscosity and high temperature resistance of the regenerated asphalt, in order to achieve an all-round and effective improvement in the performance of the asphalt pavement regeneration agent in terms of economy, weather resistance, stability, repair power, viscosity and high temperature resistance.

[0039] The weather-resistant asphalt pavement regeneration agent is prepared from the following components in parts by weight:

[0040] 60-75 parts of waste engine oil;

[0041] 2 to 6 parts of diluent;

[0042] 5-8 parts of plasticizer;

[0043] 15-25 parts of aromatic oil.

[0044] in:

[0045] The diluent is an active diluent containing an epoxy group, selected from one or more of C12-14 alkyl glycidyl ether, phenyl glycidyl ether, and benzyl glycidyl ether. These epoxy resin diluents are all active diluents, which can effectively repair the molecular structure of waste asphalt, especially the breakage of unsaturated bonds in modified asphalt, and can effectively restore the original performance of asphalt.

[0046] The plasticizer is an epoxy lipid plasticizer, selected from one or more of epoxy soybean oil, epoxy fatty acid butyl ester, and epoxy fatty acid octyl ester. These epoxy lipid plasticizers have both weather resistance and stability, can effectively absorb by-products generated during asphalt aging, and can not only improve the stability of the regeneration agent, but also effectively improve the durability of the regenerated asphalt.

[0047] The aromatic oil can supplement the aromatic components in the waste asphalt and improve the viscosity, toughness and high temperature resistance of the regenerated asphalt.

[0048] The method for preparing a weather-resistant asphalt pavement regeneration agent using the above formula specifically comprises the following steps:

[0049] S1: Pretreatment of waste oil:

[0050] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0051] S102: performing reduced pressure distillation at 120°C to 150°C, and continuously maintaining the temperature and stirring for 1h to 2h;

[0052] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0053] S2: Compound diluent and plasticizer:

[0054] S201: Heat the pure base oil, gradually increase the temperature and keep stirring;

[0055] S202: After reaching 90°C to 120°C, slowly add diluent;

[0056] S203: After keeping warm and stirring for 0.5h to 1h, slowly add the plasticizer;

[0057] S204: After stirring for 30 to 40 minutes, gradually lower the temperature to 55°C to 70°C.

[0058] S3: Add aromatic oil:

[0059] S301: gradually add aromatic oil;

[0060] S302: After stirring for 10 to 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0061] The following specific examples and comparative examples further illustrate the improvement in performance of the weather-resistant asphalt pavement regeneration agent prepared by the present invention.

[0062] Embodiment 1:

[0063] S1: Pretreatment of waste oil:

[0064] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0065] S102: Perform vacuum distillation at 140°C, and keep stirring for 1.5 hours;

[0066] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0067] S2: Compound diluent and plasticizer:

[0068] S201: Add 65 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0069] S202: After reaching 100°C, slowly add 5 parts of diluent carbon 12-14 alkyl glycidyl ether;

[0070] S203: After stirring at the temperature for 0.5 h, 6 parts of plasticizer epoxidized soybean oil are slowly added;

[0071] S204: After stirring for 40 minutes, gradually lower the temperature to 60°C.

[0072] S3: Add aromatic oil:

[0073] S301: gradually add 20 parts of aromatic oil;

[0074] S302: After stirring for 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0075] Embodiment 2:

[0076] S1: Pretreatment of waste oil:

[0077] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0078] S102: Perform vacuum distillation at 120°C, and keep stirring for 1 hour;

[0079] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0080] S2: Compound diluent and plasticizer:

[0081] S201: Add 60 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0082] S202: After reaching 90°C, slowly add 2 parts of diluent carbon 12-14 alkyl glycidyl ether;

[0083] S203: After stirring at the temperature for 0.5 h, 5 parts of plasticizer epoxidized soybean oil were slowly added;

[0084] S204: After stirring for 30 minutes, gradually lower the temperature to 55°C.

[0085] S3: Add aromatic oil:

[0086] S301: gradually add 15 parts of aromatic oil;

[0087] S302: After stirring for 10 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0088] Embodiment 3:

[0089] S1: Pretreatment of waste oil:

[0090] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0091] S102: Perform vacuum distillation at 150°C, and keep stirring for 2 hours;

[0092] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0093] S2: Compound diluent and plasticizer:

[0094] S201: Add 75 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0095] S202: After reaching 120°C, slowly add 6 parts of diluent carbon 12-14 alkyl glycidyl ether;

[0096] S203: After stirring for 1 hour, slowly add 8 parts of plasticizer epoxidized soybean oil;

[0097] S204: After stirring for 40 minutes, gradually lower the temperature to 70°C.

[0098] S3: Add aromatic oil:

[0099] S301: gradually add 25 parts of aromatic oil;

[0100] S302: After stirring for 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0101] Embodiment 4:

[0102] S1: Pretreatment of waste oil:

[0103] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0104] S102: Perform vacuum distillation at 140°C, and keep stirring for 1.5 hours;

[0105] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0106] S2: Compound diluent and plasticizer:

[0107] S201: Add 65 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0108] S202: After reaching 100°C, slowly add 5 parts of diluent carbon 12-14 alkyl glycidyl ether;

[0109] S203: After stirring at the temperature for 0.5 h, 8 parts of plasticizer epoxy soybean oil are slowly added;

[0110] S204: After stirring for 40 minutes, gradually lower the temperature to 60°C.

[0111] S3: Add aromatic oil:

[0112] S301: gradually add 15 parts of aromatic oil;

[0113] S302: After stirring for 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0114] Embodiment 5:

[0115] S1: Pretreatment of waste oil:

[0116] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0117] S102: Perform vacuum distillation at 140°C, and keep stirring for 1.5 hours;

[0118] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0119] S2: Compound diluent and plasticizer:

[0120] S201: Add 65 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0121] S202: After reaching 100°C, slowly add 5 parts of diluent phenyl glycidyl ether;

[0122] S203: After stirring at the temperature for 0.5 h, slowly add 8 parts of plasticizer epoxy fatty acid butyl ester;

[0123] S204: After stirring for 40 minutes, gradually lower the temperature to 60°C.

[0124] S3: Add aromatic oil:

[0125] S301: gradually add 25 parts of aromatic oil;

[0126] S302: After stirring for 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0127] Embodiment 6:

[0128] S1: Pretreatment of waste oil:

[0129] S101: Perform the first filtration of the waste oil using a 3.0 μm microporous filter membrane;

[0130] S102: Perform vacuum distillation at 140°C, and keep stirring for 1.5 hours;

[0131] S103: After cooling to room temperature, the mixture is filtered for the second time using a 0.6 μm microporous filter membrane to obtain pure base oil.

[0132] S2: Compound diluent and plasticizer:

[0133] S201: Add 65 parts of pure base oil into a three-necked flask, gradually increase the temperature and keep stirring;

[0134] S202: After reaching 100°C, slowly add 5 parts of diluent benzyl glycidyl ether;

[0135] S203: After stirring at the temperature for 0.5 h, slowly add 8 parts of plasticizer epoxy fatty acid octyl ester;

[0136] S204: After stirring for 40 minutes, gradually lower the temperature to 60°C.

[0137] S3: Add aromatic oil:

[0138] S301: gradually add 25 parts of aromatic oil;

[0139] S302: After stirring for 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

[0140] Comparative Example 1:

[0141] The steps are the same as those in Example 1, except that no plasticizer is added.

[0142] Comparative Example 2:

[0143] The steps are the same as those in Example 1, except that no diluent is added.

[0144] Comparative Example 3:

[0145] The steps only include S1 and S2 of Example 1, and S3 is not performed.

[0146] The same number of samples prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were taken and mixed with aged asphalt (SK90 # ) was used to prepare regenerated asphalt (using a general conventional preparation method), and the penetration, softening point and ductility of the regenerated asphalt before and after aging were measured to evaluate the anti-aging performance of the regeneration agent. The specific indicators are shown in the following table:

[0147] Table 1 List of index changes of recycled asphalt before and after aging

[0148]

[0149] Generally, after aging, the penetration and ductility of asphalt decrease, and the softening point increases, making the asphalt hard and brittle, and its resistance to temperature cracks and fatigue damage decreases. Asphalt penetration is one of the main quality indicators of asphalt. It is an indicator of the hardness and consistency of asphalt, its ability to resist shear damage, and reflects the relative viscosity of asphalt under certain conditions. The softening point of asphalt refers to the temperature at which the asphalt specimen softens and sags due to heat, reflecting the viscosity, high temperature stability and temperature sensitivity of asphalt. Asphalt ductility refers to the ductility of asphalt, and ductility is an important indicator for evaluating the plasticity of asphalt.

[0150] As shown in Table 1, the decrease in penetration and ductility of Examples 1-4 is small, and the increase in softening point is also small, which shows that the regeneration agent of the present invention has an inhibitory effect on the aging of asphalt.

[0151] Comparative Examples 1 to 3 lack plasticizer, diluent and aromatic oil components respectively. The various indicators after aging change greatly and are significantly greater than those of Examples 1-4. Only Comparative Example 3 lacks the softening point of the aromatic oil component and meets the requirements, which fully demonstrates that the regeneration agent of the present invention is feasible. If waste engine oil is used as the base oil, the above three components are indispensable and have compatibility significance.

[0152] The present invention adds a specified epoxy resin plasticizer to the formula, which can effectively absorb some light components in the asphalt aging process and react chemically with it, inhibit the loss of light components, delay the aging of asphalt, and improve the weather resistance and stability of recycled asphalt. In Example 1, which lacks a plasticizer, the decay of various indicators is most obvious.

[0153] The present invention adds a specified active diluent containing epoxy groups to the formula, which can effectively repair the molecular structure of waste asphalt. In particular, after the unsaturated bonds of the modified asphalt are broken, they will react with the epoxy groups in the active diluent, inhibiting the loss of various components and effectively restoring the original performance of the asphalt.

[0154] The present invention adds aromatic oil to the formula, which can supplement the aromatic components in the waste asphalt and improve the viscosity, toughness and high temperature resistance of the regenerated asphalt. The softening point of asphalt cannot be too low or too high, otherwise it will melt in summer and crack in winter, and it will be difficult to construct. As shown in Table 1, the change in the softening point of Examples 1-4 before and after aging is significantly smaller than that of Comparative Examples 1-3, indicating that the regeneration agent of the present invention can better maintain the softening point of the regenerated asphalt, ensuring its viscosity, toughness and high temperature resistance.

[0155] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A weather-resistant asphalt pavement regeneration agent, characterized in that: The weather-resistant asphalt pavement regeneration agent is prepared from the following components in parts by weight: 60 parts of waste engine oil; 5 parts of diluent; 6 parts of plasticizer; Aromatic oil 20 parts; The diluent is a carbon 12-14 alkyl glycidyl ether; The plasticizer is epoxidized soybean oil; Among them, the waste oil is filtered for the first time using a 3.0μm microporous filter membrane; vacuum distillation is carried out in an environment of 120℃~150℃, and the stirring is maintained at the temperature for 1h~2h; after cooling to room temperature, it is filtered for the second time using a 0.6μm microporous filter membrane to obtain pure base oil.

2. The method for preparing a weather-resistant asphalt pavement regeneration agent according to claim 1, characterized in that: The method comprises: The waste oil is filtered for the first time, heated and distilled under reduced pressure, stirred and kept warm, and filtered for the second time after cooling to room temperature to obtain pure base oil; The pure base oil is heated and stirred, a diluent is added, the plasticizer is added after the mixture is stirred and cooled; Aromatic oil is added, stirred and then cooled to obtain a weather-resistant asphalt pavement regeneration agent.

3. The method for preparing a weather-resistant asphalt pavement regeneration agent according to claim 2, characterized in that: The pure base oil is heated and stirred, a diluent is added, the plasticizer is added after the mixture is stirred and kept warm, and the mixture is stirred and cooled, including: Heat the pure base oil, gradually increasing the temperature while stirring constantly; After reaching 90℃~120℃, slowly add diluent; After keeping warm and stirring for 0.5h~1h, slowly add the plasticizer; After stirring for 30-40 minutes, gradually lower the temperature to 55-70°C.

4. The method for preparing a weather-resistant asphalt pavement regeneration agent according to claim 3, characterized in that: Aromatic oil is added, stirred and then cooled to obtain a weather-resistant asphalt pavement regeneration agent, including: Gradually add aromatic oil; After stirring for 10 to 20 minutes, the mixture is naturally cooled to room temperature to obtain a weather-resistant asphalt pavement regeneration agent.

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