Stripping agent for regeneration of waste asphalt mixture as well as preparation method and application of stripping agent

Abstract

The invention relates to a stripping agent for waste asphalt mixture regeneration as well as a preparation method and application thereof, and relates to the technical field of waste asphalt recycling, and the stripping agent for waste asphalt mixture regeneration comprises the following components in parts by weight: 100 parts of triisopropyl phenylboronic acid, 25-40 parts of ethylene glycol and 20-50 parts of fatty acid. The molecular structure of the stripping agent provided by the invention has two functional groups, namely a hydrophilic group and a lipophilic group, on one hand, the lipophilic group is easy to be subjected to addition reaction or condensation polymerization with carbonyl and carboxyl in an old asphalt film to realize stripping of old asphalt and old aggregate, and on the other hand, the lipophilic group and the old asphalt have similar polarity, and according to a similar compatibility principle, the stripping agent can be used for stripping the old asphalt from the old aggregate. The separation of the old asphalt and the old aggregate is easy to occur under the induction action of the stripping agent, and the stripped old asphalt is easy to have a chemical structure similar to that of the new asphalt and is easy to be well mixed and dissolved with the new asphalt, so that the separation of the old asphalt film and the old aggregate in the regeneration of the waste asphalt mixture is realized.

Description

Technical Field

[0001] The invention relates to the technical field of waste asphalt recycling, and in particular to a stripping agent for recycling waste asphalt mixture, and a preparation method and application thereof. Background Art

[0002] After nearly three decades of rapid development, my country's highway mileage and highway network density have leapt to the leading position in the world. As a result, a large number of asphalt pavements built in the early stage have gradually entered the stage of major or medium-sized repairs or renovation and expansion, and the amount of waste asphalt mixture (RAP) generated is astonishing. Unfortunately, however, only less than 30% of these RAPs have been recycled, and the rest have been abandoned, which not only occupies precious land resources, wastes valuable resources, but also causes serious pollution to the environment. Therefore, the recycling of old asphalt concrete has become an important issue that needs to be solved urgently.

[0003] At present, hot regeneration in factory is the main way to recycle RAP, but this method faces its own difficulties. Specifically, the mixing temperature of hot regeneration in factory usually needs to reach above 170℃. If a longer mixing time is selected, although the old asphalt in RAP can be effectively transferred, it will cause secondary aging of asphalt, which will affect the road performance of the recycled asphalt mixture; if a shorter mixing time is selected, the asphalt film in RAP is difficult to be separated from the old aggregate, resulting in a considerable proportion of RAP existing in the recycled mixture in the form of "black stone". This "black stone" phenomenon not only affects the coating effect of new asphalt on RAP, but also forms stress concentration points, further weakening the road performance of the recycled mixture. In addition, the amount of new asphalt used in the hot regeneration process is large, the economic benefits are not significant, and the negative impact of the "black stone" effect will increase with the increase of RAP content. Therefore, no matter how the mixing time is selected, it is difficult to obtain a recycled asphalt pavement with excellent performance, which greatly limits the resource recycling of RAP.

[0004] In order to achieve effective recycling of RAP, the key is to fully strip the old asphalt film and old aggregate in RAP, which is an effective way to ensure the road performance of recycled pavement. To this end, developing a stripping agent that can quickly separate the old asphalt and old aggregate in RAP under medium temperature conditions, effectively improve the interface problem in the recycled mixture, and reduce the "black stone" effect is the technical key and core of RAP recycling, which is of great significance. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a stripping agent for regeneration of waste asphalt mixture and a preparation method and application thereof.

[0006] In a first aspect, the present invention provides a stripping agent for regenerating waste asphalt mixture, wherein the stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight:

[0007] 100 parts of triisopropyl phenyl borate, 25-40 parts of ethylene glycol, 20-50 parts of fatty acid.

[0008] Furthermore, the stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight:

[0009] 100 parts of triisopropyl phenyl borate, 25-35 parts of ethylene glycol, 30-50 parts of fatty acid, 1-3 parts of heat stabilizer.

[0010] Furthermore, the stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight:

[0011] 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 45 parts of fatty acid, and 2 parts of heat stabilizer.

[0012] Furthermore, the preparation method of triisopropyl phenylborate comprises the following process:

[0013] The phenylboric acid methanol solution, the first catalyst and the azeotropic agent are subjected to a first heating and stirring process to obtain a first mixed system;

[0014] Add isopropanol dropwise to the first mixed system, perform a constant temperature reflux reaction after the addition is completed, and then cool to room temperature to obtain a second mixed system;

[0015] The second mixed system is subjected to reduced pressure distillation to remove excess solvent to obtain the triisopropyl phenylborate.

[0016] Further, the weight ratio of the phenylboric acid methanol solution, the first catalyst, the constant boiling agent and the isopropanol is 200:(4-8):(1-2):(120-140); in terms of weight percentage, the concentration of the phenylboric acid methanol solution is 55-65%; the first catalyst includes a divalent iron salt; the constant boiling agent includes cyclohexane;

[0017] The working condition parameters of the first heating and stirring include: a rotation speed of 950 to 1050 r / min and a temperature of 75 to 85° C.;

[0018] The working condition parameters of the constant temperature reflux reaction include: temperature of 122-128° C. and time of 1.5-2.5 hours.

[0019] Furthermore, the fatty acid includes 3-hydroxy-2-enebutyric acid, and the heat stabilizer includes O,O-dipropyl dithiophosphate antimony salt.

[0020] In a second aspect, the present invention provides a preparation method for regenerating waste asphalt mixture according to any one of the first aspects, the preparation method comprising the following steps:

[0021] performing a second heating and stirring on triisopropyl phenylborate and a second catalyst to obtain a third mixed system;

[0022] Adding ethylene glycol to the third mixed system for a first heating reflux, and then adding fatty acid for a second heating reflux to obtain a fourth mixed system;

[0023] After the fourth mixed system is cooled to room temperature, the remaining components are added to the system and stirred, and then filtered and washed to obtain the stripping agent for regeneration of waste asphalt mixture.

[0024] Furthermore, the working condition parameters of the second heating and stirring include: temperature of 63-67°C, rotation speed of 1450-1550r / min; the working condition parameters of the first heating reflux include: temperature of 63-67°C, time of 85-95 minutes; the working condition parameters of the second heating reflux include: temperature of 63-67°C, time of 95-105 minutes.

[0025] Furthermore, the second catalyst comprises p-toluenesulfonic acid; in terms of weight percentage, the added weight of the second catalyst accounts for 2-5% of the triisopropyl phenylborate.

[0026] In a third aspect, the present invention provides the use of the stripping agent for regenerating waste asphalt mixture as described in any one of the first aspect and the second aspect for separating old asphalt from old aggregate during the regeneration process of waste asphalt mixture, and the working temperature of the stripping agent for regenerating waste asphalt mixture is 75 to 85°C.

[0027] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0028] The embodiment of the present invention provides a stripping agent for the regeneration of waste asphalt mixture, and its preparation method and application, specifically a stripping agent for quickly separating old asphalt from old aggregate in RAP, the stripping agent has a unique molecular structure: one end of the molecular chain is a lipophilic group, and the other end is a hydrophilic group. The former is close to the polarity of the old asphalt. According to the principle of like dissolves like, it can be quickly compatible with the old asphalt to achieve the rapid separation of the old asphalt and the old aggregate; the latter can be tightly combined with the highly hydrophilic aggregate, enhancing the coating effect of the old asphalt and the aggregate. In addition, the stripping agent is miscible with a variety of organic solvents, can be easily dispersed evenly in RAP, and has good process characteristics. In the process of RAP recycling, the rapid separation of old asphalt and old aggregate can ensure that the surface of the old aggregate is exposed in the very limited mixing time of the recycled mixture, which is convenient for the secondary coating of the asphalt binder, and can also achieve the timely miscibility of the old asphalt with the new asphalt, reducing costs and being conducive to the performance improvement of the recycled mixture. Therefore, the present invention realizes the rapid separation of RAP old asphalt and old aggregate in the production process of recycled asphalt mixture, greatly weakens the "black stone effect", and has great engineering practical significance for improving the road performance of recycled asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 A schematic flow chart of a method for preparing a stripping agent for regeneration of waste asphalt mixture provided in an embodiment of the present invention.

[0032] Figure 2 This is a diagram of the mixture of RAP and new aggregate in the test example of the present invention.

[0033] Figure 3 This is a picture of the new aggregate after the old asphalt is transferred in the test example of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0035] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0036] In a first aspect, the present invention provides a stripping agent for regenerating waste asphalt mixture, wherein the stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight:

[0037] 100 parts of triisopropyl phenyl borate, 25-40 parts of ethylene glycol, 20-50 parts of fatty acid.

[0038] An embodiment of the present invention provides a stripping agent for the regeneration of waste asphalt mixture. The molecular structure of the stripping agent provided by the present invention contains two functional groups, a hydrophilic group and a lipophilic group. On the one hand, the lipophilic group easily reacts with the carbonyl group or carboxyl group in the old asphalt film to react with the lipophilic group or the carboxyl group to achieve the stripping of the old asphalt and the old aggregate. On the other hand, the lipophilic group and the old asphalt have similar polarity. According to the principle of like dissolves like, the separation of the old asphalt and the old aggregate is easy to occur under the induction of the stripping agent, and the stripped old asphalt easily has a similar chemical structure to the new asphalt and is easily miscible with the new asphalt, thereby achieving the separation of the old asphalt film and the old aggregate in the regeneration of the waste asphalt mixture.

[0039] In some specific embodiments, the stripping agent for regeneration of waste asphalt mixture includes the following components in parts by weight:

[0040] 100 parts of triisopropyl phenyl borate, 25-35 parts of ethylene glycol, 30-50 parts of fatty acid, 1-3 parts of heat stabilizer.

[0041] Furthermore, the stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight:

[0042] 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 45 parts of fatty acid, and 2 parts of heat stabilizer.

[0043] In some specific embodiments, the preparation method of triisopropyl phenylborate comprises the following process:

[0044] The phenylboric acid methanol solution, the first catalyst and the azeotropic agent are subjected to a first heating and stirring process to obtain a first mixed system;

[0045] Add isopropanol dropwise to the first mixed system, perform a constant temperature reflux reaction after the addition is completed, and then cool to room temperature to obtain a second mixed system;

[0046] The second mixed system is subjected to reduced pressure distillation to remove excess solvent to obtain the triisopropyl phenylborate.

[0047] In some specific embodiments, the weight ratio of the phenylboric acid methanol solution, the first catalyst, the constant boiling agent and the isopropanol is 200:(4-8):(1-2):(120-140); in terms of weight percentage, the concentration of the phenylboric acid methanol solution is 55-65%; the first catalyst includes a divalent iron salt, such as ferrous chloride; the constant boiling agent includes cyclohexane;

[0048] The working condition parameters of the first heating and stirring include: a rotation speed of 950 to 1050 r / min and a temperature of 75 to 85° C.;

[0049] The working condition parameters of the constant temperature reflux reaction include: temperature of 122-128° C. and time of 1.5-2.5 hours.

[0050] In some specific embodiments, the isopropanol is 2-propanol.

[0051] In some specific embodiments, the triisopropyl phenylborate is prepared by the following steps:

[0052] (1) 200 parts by weight of a 60.0% phenylboric acid methanol solution was transferred into a 500 ml three-necked flask equipped with a magnetic stirrer and a reflux condenser, and the three-necked flask was placed in an oil bath heating device with silicone oil as the heat transfer oil;

[0053] (2) Turn on the magnetic stirring, control the speed at 1000±50r / min, add 4-8 parts by weight of catalyst ferrous chloride and 1-2 parts by weight of constant boiling agent cyclohexane in sequence, and control the temperature at 80±5°C;

[0054] (3) Slowly add 120-140 parts by weight of isopropanol to the three-necked flask using a rubber-tipped dropper. After the addition is complete, raise the oil bath temperature to 125±3°C, reflux at a constant temperature for 2 hours, cool to room temperature, stop stirring, and let stand.

[0055] (4) removing excess isopropanol and solvent methanol by distillation under reduced pressure to obtain triisopropyl phenylborate.

[0056] In some specific embodiments, the fatty acid includes 3-hydroxy-2-enebutanoic acid, and the thermal stabilizer includes O,O-dipropyl dithiophosphate antimony salt.

[0057] In a second aspect, based on the same inventive concept, the present invention provides a preparation method for regenerating waste asphalt mixture as described in any one of the first aspects, the preparation method comprising the following steps:

[0058] performing a second heating and stirring on triisopropyl phenylborate and a second catalyst to obtain a third mixed system;

[0059] Adding ethylene glycol to the third mixed system for a first heating reflux, and then adding fatty acid for a second heating reflux to obtain a fourth mixed system;

[0060] After the fourth mixed system is cooled to room temperature, the remaining components are added to the system and stirred, and then filtered and washed to obtain the stripping agent for regeneration of waste asphalt mixture.

[0061] In some specific embodiments, the working condition parameters of the second heating and stirring include: temperature of 63-67°C, rotation speed of 1450-1550r / min; the working condition parameters of the first heating and reflux include: temperature of 63-67°C, time of 85-95 minutes; the working condition parameters of the second heating and reflux include: temperature of 63-67°C, time of 95-105 minutes.

[0062] In some specific embodiments, the second catalyst includes p-toluenesulfonic acid; in terms of weight percentage, the added weight of the second catalyst accounts for 2-5% of the triisopropyl phenylborate.

[0063] In some specific embodiments, the preparation method for regenerating waste asphalt mixture comprises the following steps:

[0064] (1) 100 parts of the prepared triisopropyl phenylborate are transferred to a 500 ml three-necked flask of the apparatus described in claim 2, the condensation reflux device and the magnetic stirring are turned on, the speed is controlled at 1500±50 r / min, the oil bath temperature is controlled at 65±2° C., and 2-5 parts of the catalyst p-toluenesulfonic acid are added;

[0065] (2) 30-50 parts of ethylene glycol are drained into a three-necked flask through a glass rod, and refluxed at 65±2°C for 90 min. Then 25-40 parts of unsaturated fatty acid 3-hydroxy-2-enebutyric acid are added dropwise, and reflux is continued for 100 min. The heating oil bath is then removed;

[0066] (3) After the system is cooled to room temperature, the speed of the magnetic stirrer is reduced to 500±50 r / min, and a measured heat stabilizer is added. After 5 minutes, reflux and stirring are stopped, and excess ethylene glycol is removed by washing with distilled water to obtain a stripping agent for quickly separating old asphalt and old aggregate in RAP.

[0067] In the third aspect, based on the same inventive concept, the present invention provides the use of the stripping agent for regeneration of waste asphalt mixture as described in any one of the first aspect and the second aspect for separating old asphalt from old aggregate during the regeneration process of waste asphalt mixture, and the working temperature of the stripping agent for regeneration of waste asphalt mixture is 75-85°C.

[0068] It should be noted that the stripping agent for waste asphalt mixture regeneration provided by the embodiments of the present invention, as well as the component raw materials involved in its preparation method and application, can directly use commercially available products or adopt existing public preparation methods for self-production, unless otherwise specified or specified; at the same time, the steps and parameters involved, unless otherwise specified or specified, can be carried out according to existing processing technology or directly using existing equipment, and the present invention document will not elaborate on them one by one.

[0069] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0070] Example 1

[0071] This example provides a stripping agent for quickly separating old asphalt and old aggregate in RAP. The stripping agent comprises the following components in parts by weight:

[0072] 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 25 parts of unsaturated fatty acid, 2 parts of heat stabilizer;

[0073] The unsaturated fatty acid is 3-hydroxy-2-enebutyric acid, and the heat stabilizer is O,O-dipropyl dithiophosphate antimony salt;

[0074] The preparation method of triisopropyl phenylborate comprises the following process:

[0075] (1) 200 parts by weight of a 60.0% phenylboric acid methanol solution was transferred into a 500 ml three-necked flask equipped with a magnetic stirrer and a reflux condenser, and the three-necked flask was placed in an oil bath heating device with silicone oil as the heat transfer oil;

[0076] (2) turning on magnetic stirring, controlling the speed at 1000 r / min, adding 6 parts by weight of catalyst ferrous chloride and 1.5 parts of constant boiling agent cyclohexane in sequence, and controlling the temperature at 80° C.;

[0077] (3) Slowly add 130 parts by weight of isopropanol to the three-necked flask using a rubber-tipped dropper. After the addition is complete, raise the oil bath temperature to 125° C., reflux at a constant temperature for 2 h, cool to room temperature, stop stirring, and let stand;

[0078] (4) removing excess isopropanol and solvent methanol by distillation under reduced pressure to obtain triisopropyl phenylborate.

[0079] The preparation method of the above-mentioned stripping agent comprises the following steps:

[0080] (1) The prepared triisopropyl phenylborate was transferred to a 500 ml three-necked flask, the condensation reflux device and the magnetic stirring were turned on, the speed was controlled at 1500 r / min, the oil bath temperature was controlled at 65° C., and the catalyst p-toluenesulfonic acid was added;

[0081] (2) Drain ethylene glycol into a three-necked flask through a glass rod, keep reflux at 65°C for 90 min, then drop unsaturated fatty acid into the flask, continue reflux for 100 min, and remove the heating oil bath;

[0082] (3) After the system is cooled to room temperature, the speed of the magnetic stirrer is reduced to 500 r / min, and a measured amount of heat stabilizer O,O-dipropyl dithiophosphate antimony salt is added. After 5 minutes, reflux and stirring are stopped, and excess ethylene glycol is removed by washing with distilled water to obtain a stripping agent for quickly separating old asphalt and old aggregate in RAP.

[0083] Example 2

[0084] This example provides a stripping agent for quickly separating old asphalt and old aggregate in RAP and a preparation method thereof. The only difference from Example 1 is: 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 35 parts of fatty acid, and 2 parts of thermal stabilizer; the remaining steps and parameters are the same.

[0085] Example 3

[0086] This example provides a stripping agent for quickly separating old asphalt and old aggregate in RAP and a preparation method thereof. The only difference from Example 1 is: 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 45 parts of fatty acid, and 2 parts of thermal stabilizer; the remaining steps and parameters are the same.

[0087] Example 4

[0088] This example provides a stripping agent for quickly separating old asphalt and old aggregate in RAP and a preparation method thereof. The only difference from Example 1 is: 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 45 parts of fatty acid, and 0 parts of thermal stabilizer; the remaining steps and parameters are the same.

[0089] Test Case

[0090] In this example, the stripping agent prepared in the above four examples was used to evaluate the stripping effect of old asphalt and old aggregate in RAP by the transfer rate of old asphalt in RAP. The stripping agent prepared in the above examples was sprayed evenly on the RAP mixture with a particle size of 9.5 mm or less at 0.4% of the RAP dosage, mechanically stirred for 2 to 3 minutes, and then added with an equal amount of new aggregate of 9.5 mm to 13.2 mm as RAP, heated to 80 ± 5 ° C and continued to stir for 5 minutes (see Figure 2 and Figure 3 ), the mixed material is screened using a 9.5mm aggregate sieve, which can separate RAP with a particle size of less than 9.5mm from new aggregates of 9.5mm to 13.2mm, and the mass increase of the new aggregate is calculated by weighing, which is the mass of the aged asphalt adhering to the new aggregate, that is, the aged asphalt transferred to the surface of the new aggregate during the mixing process of the RAP mixture, and the transfer rate is obtained by dividing this mass by the total mass of the old asphalt in the RAP. The test results of the old asphalt transfer rate of the four embodiments are listed in Table 1. In Table 1, the mass of RAP is equal to that of the new aggregate, and the asphalt content in the RAP has been previously determined to be 4.77%.

[0091] Table 1

[0092]

[0093]

[0094] From the experimental comparison in Table 1 above, it can be seen that if RAP is mixed with new aggregate at medium temperature (about 80°C), the transfer rate of old asphalt is only 4.56%, which can be considered as almost no transfer; as the fatty acid content increases, the transfer rate also increases accordingly, but when the fatty acid addition exceeds 35 parts, the transfer rate of asphalt increases slowly, so Example 2 is recommended as the preferred solution. In Example 4, the transfer rate of old asphalt has dropped significantly compared with Example 2 and Example 3, mainly because Example 4 does not add a heat stabilizer, resulting in the volatilization of the stripping agent during the medium temperature mixing process, which weakens its transfer effect.

[0095] In summary, the embodiments of the present invention provide a stripping agent for the regeneration of waste asphalt mixtures, and a preparation method and application thereof. The molecular structure of the stripping agent provided by the present invention contains two functional groups, namely, a hydrophilic group and a lipophilic group. On the one hand, the lipophilic group easily reacts with the carbonyl group or carboxyl group in the old asphalt film to react with the lipophilic group or the carboxyl group to achieve the stripping of the old asphalt and the old aggregate. On the other hand, the lipophilic group and the old asphalt have similar polarity. According to the principle of like dissolves like, the separation of the old asphalt and the old aggregate is easy to occur under the induction of the stripping agent, and the stripped old asphalt easily has a similar chemical structure to the new asphalt and is easily miscible with the new asphalt, thereby achieving the separation of the old asphalt film and the old aggregate in the regeneration of the waste asphalt mixture.

[0096] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0097] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A stripping agent for regeneration of waste asphalt mixture, characterized in that: The stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight: 100 parts of triisopropyl phenyl borate, 25-40 parts of ethylene glycol, 20-50 parts of fatty acid.

2. The stripping agent for regeneration of waste asphalt mixture according to claim 1, characterized in that: The stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight: 100 parts of triisopropyl phenyl borate, 25-35 parts of ethylene glycol, 30-50 parts of fatty acid, 1-3 parts of heat stabilizer.

3. The stripping agent for regeneration of waste asphalt mixture according to claim 1, characterized in that: The stripping agent for regenerating waste asphalt mixture comprises the following components in parts by weight: 100 parts of triisopropyl phenyl borate, 30 parts of ethylene glycol, 45 parts of fatty acid, and 2 parts of heat stabilizer.

4. The stripping agent for regeneration of waste asphalt mixture according to any one of claims 1 to 3, characterized in that: The preparation method of triisopropyl phenylborate comprises the following process: The phenylboric acid methanol solution, the first catalyst and the azeotropic agent are subjected to a first heating and stirring process to obtain a first mixed system; isopropanol is added dropwise to the first mixed system, and after the addition is completed, a constant temperature reflux reaction is carried out, and then the mixture is cooled to room temperature to obtain a second mixed system; The second mixed system is subjected to reduced pressure distillation to remove excess solvent to obtain the triisopropyl phenylborate.

5. The stripping agent for regeneration of waste asphalt mixture according to claim 4, characterized in that: The weight ratio of the phenylboric acid methanol solution, the first catalyst, the constant boiling agent and the isopropanol is 200:(4-8):(1-2):(120-140); in terms of weight percentage, the concentration of the phenylboric acid methanol solution is 55-65%; the first catalyst includes a divalent iron salt; The constant boiling agent includes cyclohexane; The working condition parameters of the first heating and stirring include: a rotation speed of 950 to 1050 r / min and a temperature of 75 to 85° C.; The working condition parameters of the constant temperature reflux reaction include: temperature of 122-128° C. and time of 1.5-2.5 hours.

6. The stripping agent for regeneration of waste asphalt mixture according to claim 2, characterized in that: The fatty acid includes 3-hydroxy-2-enebutyric acid, and the heat stabilizer includes O,O-dipropyl dithiophosphate antimony salt.

7. A method for preparing a stripping agent for regeneration of waste asphalt mixture according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: performing a second heating and stirring on triisopropyl phenylborate and a second catalyst to obtain a third mixed system; Adding ethylene glycol to the third mixed system for a first heating reflux, and then adding fatty acid for a second heating reflux to obtain a fourth mixed system; After the fourth mixed system is cooled to room temperature, the remaining components are added to the system and stirred, and then filtered and washed to obtain the stripping agent for regeneration of waste asphalt mixture.

8. The method for preparing a stripping agent for regeneration of waste asphalt mixture according to claim 7, characterized in that: The working condition parameters of the second heating and stirring include: temperature of 63-67°C and rotation speed of 1450-1550r / min; the working condition parameters of the first heating and reflux include: temperature of 63-67°C and time of 85-95 minutes; the working condition parameters of the second heating and reflux include: temperature of 63-67°C and time of 95-105 minutes.

9. The method for preparing a stripping agent for regeneration of waste asphalt mixture according to claim 1, characterized in that: The second catalyst comprises p-toluenesulfonic acid; in terms of weight percentage, the added weight of the second catalyst accounts for 2-5% of the triisopropyl phenylborate.

10. Use of the stripping agent for waste asphalt mixture regeneration according to any one of claims 1 to 9 for separating old asphalt from old aggregate in the process of waste asphalt mixture regeneration, characterized in that: The working temperature of the stripping agent used for the regeneration of waste asphalt mixture is 75-85°C.

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