Waste rubber-plastic composite modified asphalt as well as preparation method and application thereof

Abstract

The invention discloses waste rubber-plastic composite modified asphalt as well as a preparation method and application thereof, and relates to the technical field of modified asphalt materials, the waste rubber-plastic composite modified asphalt comprises the following components in parts by weight: 90-115 parts of matrix asphalt, 30-45 parts of a modified rubber-plastic composite material, 1-5 parts of naphthenic rubber oil and 0.2-0.7 part of sulfur. According to the invention, a CO2 supercritical fluid carrying ionic liquid swelling treatment process and a microwave plasma treatment process are mainly adopted to carry out combined synergistic treatment on the rubber-plastic mixture, so that the problem that the storage stability, the temperature resistance and the like of the rubber-plastic mixture in asphalt are obviously reduced due to overhigh doping content is effectively solved; on the premise of ensuring that the performance of the asphalt required by the road engineering material meets the standard, the recycling rate of the waste rubber powder and the waste plastic is remarkably improved, and a new means is provided for preparation of the modified asphalt and cyclic utilization of waste resources.

Description

Technical Field

[0001] The invention relates to the technical field of modified asphalt materials, and in particular to a waste rubber-plastic composite modified asphalt and a preparation method and application thereof. Background Art

[0002] Asphalt is an important basic material in road engineering materials. Its performance directly affects the service life of roads and driving safety. With the continuous increase in traffic volume and the increasing load of vehicles, the performance requirements for asphalt materials are getting higher and higher. In order to improve the performance of asphalt, modified asphalt technology came into being and became a research hotspot in this field.

[0003] However, in the preparation process of modified asphalt, the utilization of waste rubber and waste plastic has always been a research focus. Waste rubber such as waste tires and waste plastics such as waste plastic bottles are a large amount of industrial waste. Their recycling not only helps to reduce environmental pollution, but also saves resources. At present, using waste rubber and waste plastics to prepare rubber-plastic composite modified asphalt has become an important way of resource recycling.

[0004] However, the traditional rubber-plastic composite modified asphalt faces many challenges in the preparation process. The poor dispersibility of waste rubber powder and waste plastic powder in asphalt and poor compatibility with the base asphalt limit their extensive application in modified asphalt. Moreover, it is difficult to reach more than 20% of the content of rubber powder such as waste rubber, which greatly limits the utilization rate of waste rubber powder and makes it impossible to effectively recycle a large amount of waste rubber resources.

[0005] In addition, when the content of rubber-plastic mixture is high, it is easy to lead to a decrease in the storage stability of the modified asphalt and a significant decrease in the temperature resistance, which cannot meet the performance requirements of asphalt for road projects and also limits the further application of waste rubber and waste plastic in modified asphalt. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a waste rubber-plastic composite modified asphalt and a preparation method and application thereof.

[0007] In a first aspect, the present invention provides a waste rubber-plastic composite modified asphalt, wherein the waste rubber-plastic composite modified asphalt comprises the following components in parts by weight:

[0008] 90-115 parts of base asphalt, 30-45 parts of modified rubber-plastic composite, 1-5 parts of naphthenic rubber oil and 0.2-0.7 parts of sulfur;

[0009] The modified rubber-plastic composite material is obtained by subjecting waste rubber powder and waste plastic powder to swelling treatment with CO2 supercritical fluid carrying ionic liquid and microwave plasma treatment in sequence;

[0010] The ionic liquid is a vinyl-containing imidazole ionic liquid.

[0011] Further, by weight, the waste rubber-plastic composite modified asphalt comprises the following components:

[0012] 100 parts of matrix asphalt, 40.5 parts of modified rubber-plastic composite, 3 parts of naphthenic rubber oil, and 0.5 part of sulfur.

[0013] Further, the weight ratio of the waste rubber to the waste plastic is (75-85):(11-17).

[0014] Further, the preparation method of the modified rubber-plastic composite comprises the following process:

[0015] Mix the waste rubber powder and the waste plastic powder to obtain a first rubber-plastic mixture;

[0016] Place the first rubber-plastic mixture in a closed device containing an ionic liquid, remove air and introduce CO2, and then, without the first rubber-plastic mixture directly contacting the ionic liquid, carry the ionic liquid to perform a swelling treatment on the first rubber-plastic mixture to obtain a second rubber-plastic mixture;

[0017] Perform microwave plasma treatment on the second rubber-plastic mixture to obtain the modified rubber-plastic composite;

[0018] Among them, the working condition parameters of the swelling treatment include: temperature is 80-95 °C, pressure is 8.5-10 Mpa, and time is 5-10 min;

[0019] The working condition parameters of the microwave plasma treatment include: using atmospheric pressure open type, power is 400-600 W, working medium is air, and treatment duration is 2-5 min.

[0020] Further, the weight ratio of the waste rubber to the waste plastic is 80:13; the working condition parameters of the swelling treatment include: temperature is 90 °C, pressure is 9 Mpa, and time is 7 min; the working condition parameters of the microwave plasma treatment include: using atmospheric pressure open type, power is 530 W, working medium is air, and treatment duration is 3 min.

[0021] Further, the matrix asphalt comprises No. 70 petroleum asphalt; the vinyl-containing imidazole ionic liquid comprises at least one of 1-vinyl-3-butylimidazole tetrafluoroborate, 1-vinyl-3-ethylimidazole bromide, and 1-vinyl-3-methylimidazole chloride.

[0022] Further, the waste rubber powder includes waste rubber powder with a particle size of 50 to 100 mesh obtained by crushing waste tire rubber; the waste plastic powder includes waste plastic powder with a particle size of 100 to 200 mesh obtained by crushing waste high-density polyethylene products with a density of 0.941 to 0.965 g / cm 3 The waste plastic powder is obtained by crushing waste high-density polyethylene products with a density of 0.941 to 0.965 g / cm.

[0023] In a second aspect, based on the same inventive concept, the present invention provides a method for preparing the waste rubber-plastic composite modified asphalt according to any one of the first aspect, as Figure 1 shown, the preparation method includes the following steps:

[0024] Perform the first heating and stirring on the matrix asphalt to obtain material A;

[0025] Perform the second heating and stirring on the modified rubber-plastic composite and naphthenic rubber oil to obtain material B;

[0026] Perform the third heating and stirring on the material A and the material B, and then add sulfur for the fourth heating and stirring to obtain the waste rubber-plastic composite modified asphalt.

[0027] Further, the working condition parameters of the first heating and stirring include: the temperature is 155°C to 165°C, the time is 5 to 10 min, and the rotation speed is 800 to 1200 rpm; the working condition parameters of the second heating and stirring include: the temperature is 170°C to 180°C, the time is 20 to 30 min, and the rotation speed is 4000 to 5000 rpm; the working condition parameters of the third heating and stirring include: the temperature is 160°C to 170°C, the time is 30 to 40 min, and the rotation speed is 3500 to 4500 rpm; the working condition parameters of the fourth heating and stirring include: the temperature is 160°C to 170°C, the time is 30 to 40 min, and the rotation speed is 4000 to 5000 rpm.

[0028] In a third aspect, based on the same inventive concept, the present invention provides an application of the waste rubber-plastic composite modified asphalt according to any one of the first aspect or the waste rubber-plastic composite modified asphalt prepared by using the preparation method according to any one of the second aspect in the preparation of road engineering materials.

[0029] The above technical solutions provided by the embodiments of the present invention have at least the following advantages compared with the prior art:

[0030] An embodiment of the present invention provides a waste rubber-plastic composite modified asphalt, its preparation method and application. The present invention mainly uses a combined synergistic treatment process of CO2 supercritical fluid carrying ionic liquid swelling treatment and microwave plasma treatment on the rubber-plastic mixture, effectively solving the problems of significant reduction in storage stability and temperature resistance performance caused by excessive admixture content of the rubber-plastic mixture in asphalt; on the premise of ensuring that the asphalt performance required for road engineering materials meets the standards, the recycling utilization rate of waste rubber powder and waste plastic is significantly improved, providing a new means for the preparation of modified asphalt and the recycling of waste resources. Specifically:

[0031] 1) On the one hand, the present invention utilizes the unique properties of supercritical CO2 fluid, such as high diffusivity and high density of liquid. Under the action of supercritical CO2 fluid, not only can the rubber-plastic mixture be swollen, increasing the molecular chain spacing, but also the imidazole ionic liquid containing vinyl high-activity matrix can better penetrate into the surface and interior of waste rubber powder and waste plastic powder, improving the activity and fluidity of the rubber-plastic mixture, providing more favorable conditions for microwave plasma treatment.

[0032] 2) On the other hand, when the swollen rubber-plastic mixture is subjected to microwave plasma action, high-energy particles and free radicals are more likely to enter the interior of the molecular chain. The rubber-plastic molecular chains collide and react, causing the fracture and recombination of the molecular chains, triggering more sufficient reactions, improving the self-performance of the rubber-plastic mixture, and at the same time further and more effectively improving the compatibility, reaction activity and construction workability of the rubber-plastic mixture with the matrix asphalt, thus effectively solving the problems of significant reduction in storage stability and temperature resistance performance caused by excessive admixture content of the rubber-plastic mixture in asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic flow chart of a preparation method of a waste rubber-plastic composite modified asphalt provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0037] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchases or prepared by existing methods. For example, naphthenic rubber oil can directly use commercially available products such as naphthenic oil KN4006 (flash point 210°C); at the same time, for the steps and parameters involved, without special limitations or specific descriptions, they can be carried out according to the steps and parameters of the waste rubber-plastic composite modified asphalt preparation process disclosed in the prior art or directly using existing equipment according to the operating instructions. The present invention document will not elaborate one by one.

[0038] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions, or conditions recommended by the manufacturer.

[0039] Example 1

[0040] This example provides a waste rubber-plastic composite modified asphalt. By weight, the waste rubber-plastic composite modified asphalt includes the following components:

[0041] 100 parts of matrix asphalt, 40.5 parts of modified rubber-plastic composite, 3 parts of naphthenic rubber oil, and 0.5 part of sulfur;

[0042] The matrix asphalt is 70# petroleum asphalt, and the naphthenic rubber oil is naphthenic oil KN4006;

[0043] The modified rubber-plastic composite is obtained by successively swelling the waste rubber powder and waste plastic powder with a weight ratio of 80:13 by CO2 supercritical fluid carrying ionic liquid and microwave plasma treatment. The ionic liquid is 1-vinyl-3-ethylimidazolium bromide. The waste rubber powder is waste rubber powder with a particle size of 50 meshes obtained by crushing waste tire rubber; the waste plastic powder is waste plastic powder with a particle size of 150 meshes obtained by crushing high-density polyethylene waste products with a density of 0.941 - 0.965 g / cm 3 The preparation method of the modified rubber-plastic composite includes the following process:

[0044] Mix the waste rubber powder and the waste plastic powder to obtain a first rubber-plastic mixture;

[0045] Place the first rubber-plastic mixture in a closed device filled with an ionic liquid, evacuate the air and introduce CO2, and then carry out a swelling treatment on the first rubber-plastic mixture with the ionic liquid without direct contact between the first rubber-plastic mixture and the ionic liquid to obtain a second rubber-plastic mixture;

[0046] Carry out microwave plasma treatment on the second rubber-plastic mixture to obtain the modified rubber-plastic composite;

[0047] Among them, the working condition parameters of the swelling treatment include: temperature 90°C, pressure 9 Mpa, time 7 min;

[0048] The working condition parameters of the microwave plasma treatment include: using atmospheric pressure open type, power 530 W, working medium air, treatment duration 3 min.

[0049] The preparation method of the above-mentioned waste rubber-plastic composite modified asphalt includes the following steps:

[0050] Carry out the first heating and stirring on the base asphalt to obtain material A;

[0051] Carry out the second heating and stirring on the modified rubber-plastic composite and the naphthenic rubber oil to obtain material B;

[0052] Carry out the third heating and stirring on the material A and the material B, and then add sulfur for the fourth heating and stirring to obtain the waste rubber-plastic composite modified asphalt.

[0053] Among them, the working condition parameters of the first heating and stirring include: temperature 160°C, time 8 min, rotation speed 1000 rpm; the working condition parameters of the second heating and stirring include: temperature 175°C, time 25 min, rotation speed 4500 rpm; the working condition parameters of the third heating and stirring include: temperature 165°C, time 35 min, rotation speed 4000 rpm; the working condition parameters of the fourth heating and stirring include: temperature 165°C, time 35 min, rotation speed 4500 rpm.

[0054] Example 2

[0055] This example provides a waste rubber-plastic composite modified asphalt, which, by weight, includes the following components:

[0056] 90 parts of base asphalt, 30 parts of modified rubber-plastic composite, 1 part of naphthenic rubber oil and 0.2 part of sulfur;

[0057] The base asphalt is No. 70 petroleum asphalt, and the naphthenic rubber oil is naphthenic oil KN4006;

[0058] The modified rubber-plastic composite is obtained by successively swelling the waste rubber powder and waste plastic powder with a weight ratio of 75:11 by CO2 supercritical fluid carrying ionic liquid and microwave plasma treatment. The ionic liquid is 1-vinyl-3-butylimidazolium tetrafluoroborate. The waste rubber powder is waste rubber powder with a particle size of 100 mesh obtained by crushing waste tire rubber; the waste plastic powder is waste plastic powder with a particle size of 100 mesh obtained by crushing high-density polyethylene waste products with a density of 0.941 - 0.965 g / cm 3 The preparation method of the modified rubber-plastic composite includes the following processes:

[0059] Mix the waste rubber powder and the waste plastic powder to obtain the first rubber-plastic mixture;

[0060] Place the first rubber-plastic mixture in a closed device filled with ionic liquid, evacuate the air and introduce CO2, and then carry the ionic liquid to swell the first rubber-plastic mixture without direct contact between the first rubber-plastic mixture and the ionic liquid to obtain the second rubber-plastic mixture;

[0061] Perform microwave plasma treatment on the second rubber-plastic mixture to obtain the modified rubber-plastic composite;

[0062] Among them, the working condition parameters of the swelling treatment include: temperature 80°C, pressure 8.5 Mpa, time 10 min;

[0063] The working condition parameters of the microwave plasma treatment include: using atmospheric pressure open type, power 400 W, working medium air, treatment duration 5 min.

[0064] The preparation method of the above waste rubber-plastic composite modified asphalt includes the following steps:

[0065] Perform the first heating and stirring on the base asphalt to obtain material A;

[0066] Perform the second heating and stirring on the modified rubber-plastic composite and the naphthenic rubber oil to obtain material B;

[0067] Perform the third heating and stirring on material A and material B, and then add sulfur for the fourth heating and stirring to obtain the waste rubber-plastic composite modified asphalt.

[0068] Among them, the working condition parameters of the first heating and stirring include: temperature of 155°C, time of 10 min, and rotation speed of 800 rpm; the working condition parameters of the second heating and stirring include: temperature of 180°C, time of 20 min, and rotation speed of 4000 rpm; the working condition parameters of the third heating and stirring include: temperature of 160°C, time of 40 min, and rotation speed of 3500 rpm; the working condition parameters of the fourth heating and stirring include: temperature of 160°C, time of 40 min, and rotation speed of 4000 rpm.

[0069] Example 3

[0070] This example provides a waste rubber-plastic composite modified asphalt. By weight, the waste rubber-plastic composite modified asphalt includes the following components:

[0071] 115 parts of matrix asphalt, 45 parts of modified rubber-plastic composite, 5 parts of naphthenic rubber oil, and 0.7 parts of sulfur;

[0072] The matrix asphalt is 70# petroleum asphalt, and the naphthenic rubber oil is naphthenic oil KN4006;

[0073] The modified rubber-plastic composite is obtained by successively subjecting waste rubber powder and waste plastic powder with a weight ratio of 75:11 to swelling treatment by CO2 supercritical fluid carrying ionic liquid and microwave plasma treatment. The ionic liquid is 1-vinyl-3-methylimidazolium chloride. The waste rubber powder is waste rubber powder with a particle size of 50 mesh obtained by crushing waste tire rubber; the waste plastic powder is waste plastic powder with a particle size of 200 mesh obtained by crushing high-density polyethylene waste products with a density of 0.941 - 0.965 g / cm 3 The preparation method of the modified rubber-plastic composite includes the following processes:

[0074] Mix the waste rubber powder and the waste plastic powder to obtain a first rubber-plastic mixture;

[0075] Place the first rubber-plastic mixture in a closed device filled with ionic liquid, remove air, and introduce CO2. Then, carry the ionic liquid to swell the first rubber-plastic mixture without direct contact between the first rubber-plastic mixture and the ionic liquid to obtain a second rubber-plastic mixture;

[0076] Perform microwave plasma treatment on the second rubber-plastic mixture to obtain the modified rubber-plastic composite;

[0077] Among them, the working condition parameters of the swelling treatment include: temperature of 95°C, pressure of 10 Mpa, and time of 5 min;

[0078] The working condition parameters of the microwave plasma treatment include: an atmospheric pressure open type, a power of 600 W, an air working medium, and a treatment duration of 2 min.

[0079] The preparation method of the above waste rubber-plastic composite modified asphalt includes the following steps:

[0080] Perform the first heating and stirring on the matrix asphalt to obtain material A;

[0081] Perform the second heating and stirring on the modified rubber-plastic composite and naphthenic rubber oil to obtain material B;

[0082] Perform the third heating and stirring on the material A and the material B, and then add sulfur for the fourth heating and stirring to obtain the waste rubber-plastic composite modified asphalt.

[0083] Among them, the working condition parameters of the first heating and stirring include: a temperature of 165 °C, a time of 5 min, and a rotation speed of 1200 rpm; the working condition parameters of the second heating and stirring include: a temperature of 170 °C, a time of 30 min, and a rotation speed of 5000 rpm; the working condition parameters of the third heating and stirring include: a temperature of 170 °C, a time of 30 min, and a rotation speed of 4500 rpm; the working condition parameters of the fourth heating and stirring include: a temperature of 170 °C, a time of 30 min, and a rotation speed of 5000 rpm.

[0084] Comparative Example 1

[0085] This example provides a waste rubber-plastic composite modified asphalt and its preparation method, the difference from Example 1 is only that: the modified rubber-plastic composite in Example 1 is adjusted to an unmodified rubber-plastic mixture (i.e., the first rubber-plastic mixture in Example 1); the remaining steps and parameters are the same.

[0086] Comparative Example 2

[0087] This example provides a waste rubber-plastic composite modified asphalt and its preparation method, the difference from Example 1 is only that: the modified rubber-plastic composite in Example 1 is adjusted to a rubber-plastic mixture swollen by CO2 supercritical fluid carrying ionic liquid (i.e., the second rubber-plastic mixture in Example 1); the remaining steps and parameters are the same.

[0088] Comparative Example 3

[0089] This example provides a waste rubber-plastic composite modified asphalt and its preparation method, the difference from Example 1 is only that: the modified rubber-plastic composite in Example 1 is adjusted to a rubber-plastic mixture treated by microwave plasma (i.e., the first rubber-plastic mixture in Example 1 and obtained by microwave plasma treatment under the same parameters as in Example 1); the remaining steps and parameters are the same.

[0090] Comparative Example 4

[0091] This example provides a waste rubber-plastic composite modified asphalt and its preparation method. The difference from Example 1 is only that 1-vinyl-3-ethylimidazolium bromide in Example 1 is adjusted to 1-butyl-3-methylimidazolium chloride; the remaining steps and parameters are the same.

[0092] Test Example

[0093] In this example, the waste rubber-plastic composite modified asphalt obtained from the above Examples 1 to 3 and Comparative Examples 1 to 4 was subjected to performance tests; among them, the softening point (°C), penetration (25°C, dmm), ductility at 5°C (cm), and the difference in softening point up and down for 48 h (°C) were carried out in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011); the polymer modified asphalt separation test was carried out with reference to T0661-2011, and the test results are shown in Table 1.

[0094] Table 1 Performance Test Results

[0095]

[0096]

[0097] As can be seen from Table 1, compared with Comparative Examples 1 to 4, the waste rubber-plastic composite modified asphalt provided by Examples 1 to 3 of the present invention has better storage stability and temperature resistance; especially, the difference in softening point up and down for 48 h is maintained below 1.5°C, effectively solving the problem of significant reduction in storage stability and temperature resistance caused by too high an admixture content of rubber-plastic mixtures in asphalt. At the same time, the present invention combines and synergistically treats the rubber-plastic mixture through the CO2 supercritical fluid carrying ionic liquid swelling treatment process and the microwave plasma treatment process, and the two play a significant positive synergistic effect.

[0098] In summary, the embodiments of the present invention provide a waste rubber-plastic composite modified asphalt, its preparation method and application. The present invention mainly combines and synergistically treats the rubber-plastic mixture through the CO2 supercritical fluid carrying ionic liquid swelling treatment process and the microwave plasma treatment process, effectively solving the problem of significant reduction in storage stability and temperature resistance caused by too high an admixture content of rubber-plastic mixtures in asphalt; on the premise of ensuring that the asphalt performance required for road engineering materials meets the standards, the recycling rate of waste rubber powder and waste plastics is significantly improved, providing a new means for the preparation of modified asphalt and the recycling of waste resources.

[0099] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can 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 these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A waste rubber-plastic composite modified asphalt, characterized in that: In parts by weight, the waste rubber-plastic composite modified asphalt Includes the following components: 90-115 parts of base asphalt, 30-45 parts of modified rubber-plastic composite, 1-5 parts of naphthenic rubber oil and 0.2-0.7 parts of sulfur; The modified rubber-plastic composite material is obtained by subjecting waste rubber powder and waste plastic powder to swelling treatment with CO2 supercritical fluid carrying ionic liquid and microwave plasma treatment in sequence; The ionic liquid is an imidazole ionic liquid containing a vinyl group.

2. The waste rubber-plastic composite modified asphalt according to claim 1, characterized in that: In parts by weight, the waste rubber-plastic composite modified asphalt Includes the following components: 100 parts of base asphalt, 40.5 parts of modified rubber-plastic composite, 3 parts of cycloalkyl rubber oil and 0.5 parts of sulfur.

3. The waste rubber-plastic composite modified asphalt according to claim 1, characterized in that: The weight ratio of the waste rubber to the waste plastic is (75-85):(11-17).

4. The waste rubber-plastic composite modified asphalt according to claim 1, characterized in that: Preparation method of modified rubber-plastic composite material The process includes: Mixing the waste rubber powder and the waste plastic powder to obtain a first rubber-plastic mixture; The first rubber-plastic mixture is placed in a closed device containing an ionic liquid, and air is removed and CO2 is introduced, and then the first rubber-plastic mixture is swollen by carrying the ionic liquid without direct contact between the first rubber-plastic mixture and the ionic liquid, to obtain a second rubber-plastic mixture; The second rubber-plastic mixture is subjected to microwave plasma treatment to obtain the modified rubber-plastic composite material; The working condition parameters of the swelling treatment include: temperature of 80-95°C, pressure of 8.5-10Mpa, and time of 5-10min; The working condition parameters of the microwave plasma treatment include: using an atmospheric pressure open mode, a power of 400-600W, air as the working medium, and a treatment time of 2-5min.

5. The waste rubber-plastic composite modified asphalt according to claim 4, characterized in that: The weight ratio of the waste rubber to the waste plastic is 80:13; the working condition parameters of the swelling treatment include: temperature of 90°C, pressure of 9Mpa, and time of 7min; the working condition parameters of the microwave plasma treatment include: open atmospheric pressure, power of 530W, working medium of air, and treatment time of 3min.

6. The waste rubber-plastic composite modified asphalt according to claim 1, characterized in that: The matrix asphalt includes No. 70 petroleum asphalt; the vinyl-containing imidazole ionic liquid includes at least one of 1-vinyl-3-butyl imidazole tetrafluoroborate, 1-vinyl-3-ethyl imidazole bromide and 1-vinyl-3-methyl imidazole chloride.

7. The waste rubber-plastic composite modified asphalt according to claim 1, characterized in that: The waste rubber powder includes waste rubber powder with a particle size of 50 to 100 mesh obtained by crushing waste tire rubber; the waste plastic powder includes waste plastic powder with a density of 0.941 to 0.965 g / cm 3 The waste plastic powder with a particle size of 100 to 200 meshes is obtained by crushing the waste high-density polyethylene products.

8. A method for preparing waste rubber-plastic composite modified asphalt according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The base asphalt is first heated and stirred to obtain material A; The modified rubber-plastic composite material and the cycloalkyl rubber oil are subjected to a second heating and stirring process to obtain material B; The material A and the material B are subjected to a third heating and stirring process, and then sulfur is added thereto for a fourth heating and stirring process to obtain the waste rubber-plastic composite modified asphalt.

9. The method for preparing waste rubber-plastic composite modified asphalt according to claim 8, characterized in that: The working condition parameters of the first heating and stirring include: temperature of 155℃~165℃, time of 5~10min, and rotation speed of 800~1200rpm; the working condition parameters of the second heating and stirring include: temperature of 170℃~180℃, time of 20~30min, and rotation speed of 4000~5000rpm; the working condition parameters of the third heating and stirring include: temperature of 160℃~170℃, time of 30~40min, and rotation speed of 3500~4500rpm; the working condition parameters of the fourth heating and stirring include: temperature of 160℃~170℃, time of 30~40min, and rotation speed of 4000~5000rpm.

10. Use of the waste rubber-plastic composite modified asphalt according to any one of claims 1 to 7 or the waste rubber-plastic composite modified asphalt prepared by the preparation method of the waste rubber-plastic composite modified asphalt according to any one of claims 8 to 9 in preparing road engineering materials.

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