Pre-swelling multipolymer high-viscoelastic asphalt modified particle and preparation method thereof

Abstract

The invention discloses pre-swelling multipolymer high-viscoelastic asphalt modified particles and a preparation method thereof, and belongs to the technical field of road engineering materials. The pre-swelling multipolymer high-viscoelastic asphalt modified particles are prepared from the following components in parts by weight: 10 to 40 parts of desulfurized waste tire rubber powder, 20 to 30 parts of styrene-butadiene-styrene block copolymer, 15 to 20 parts of adhesive, 10 to 17 parts of compatilizer, 13 to 18 parts of tackifier and 2 to 5 parts of auxiliary agent. In the pre-swelling multi-polymer high-viscoelastic asphalt modified particle provided by the invention, the desulfurized waste tire rubber powder is pre-swelled in the compatilizer, and the SBS develops in advance in the asphalt adhesive to form a continuous phase system which is not easy to deform and has a certain degree of elastic property with asphalt; according to the preparation method, high-volume desulfurized waste tire rubber powder and SBS in the prepared modified particles can be stably dispersed in matrix asphalt, the performance is rapidly improved, the construction workability is improved, and the modified particles have the advantages of good viscoelasticity, adjustment and optimization as required, stable system, high economic benefit and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a pre-swollen multi-polymer high-viscoelastic asphalt modified particle and a preparation method thereof. Background Art

[0002] High-viscosity and high-elasticity modified asphalt is widely used in ultra-thin asphalt overlays, large-void drainage and noise reduction pavements, high-temperature and heavy-load sections and some special paving projects due to its high viscosity and good elastic recovery performance. It can effectively improve the high-temperature stability, low-temperature crack resistance and fatigue resistance of asphalt pavements.

[0003] The large-scale production process of high-viscosity elastic modified asphalt is relatively complicated, requiring precise control of temperature, mixing time and the amount of modifier added. In addition, for small-scale engineering projects, such as urban road repairs or small infrastructure construction, large-scale production of modified asphalt may lead to excess and waste of materials. During the transportation of high-viscosity elastic modified asphalt, due to factors such as vibration and temperature changes, the modifier may separate from the base asphalt, thus affecting the service life and quality of the road. These factors have limited the development of high-viscosity elastic modified asphalt.

[0004] In order to solve the above problems, researchers proposed a dry process. The dry process can directly mix the modifier, asphalt and mineral materials, omit the transportation link of modified asphalt, and fundamentally avoid the segregation of modified asphalt. At present, through the unremitting efforts of many researchers, the progress made in the research of dry high-viscoelastic modifiers is quite rapid. However, although the performance of the existing dry modifiers can meet the requirements of the specifications, they are slightly insufficient in the application of special pavement structures such as drainage pavements and ultra-thin wear layers. The solubility with the base asphalt is slightly insufficient, and the performance improvement of the prepared modified asphalt requires a long time to develop.

[0005] In view of this, it is necessary to develop a granulated high-viscosity and high-elastic asphalt modifier with excellent road performance, good solubility and low cost, so as to realize the multi-scenario application of high-viscosity modified asphalt in stress absorption layers, drainage and noise reduction pavements, special anti-rutting sections, preventive maintenance ultra-thin overlays and other large, medium and small-scale new construction and maintenance fields, and promote the widespread application of high-viscosity and high-elastic modified asphalt. Summary of the invention

[0006] The object of the present invention is to provide a pre-swollen multi-polymer high-viscoelastic asphalt modified particle and a preparation method thereof. By using pre-swollen rubber powder and mixing with other modifiers to prepare high-viscoelastic modified particles, it can be ensured that the rubber powder is pre-swollen, and the styrene-butadiene-styrene block copolymer (SBS) and asphalt swell and develop. Therefore, the pre-swollen multi-polymer high-viscoelastic asphalt modified particles can be quickly dissolved in the matrix asphalt when preparing modified asphalt, and high-viscosity and high-elastic modified asphalt can be obtained without long-term development. The performance indicators of the modified asphalt prepared by using the pre-swollen multi-polymer high-viscoelastic asphalt modified particles provided by the present invention can simultaneously meet the technical requirements of multiple national standards and industry standards for high-viscoelastic modified asphalt binders such as JTG / T 3350-03-2020, GB / T 30516-2014 and JTG 5142-2019.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a pre-swollen multi-polymer high-viscoelastic asphalt modified particle, which comprises, by weight, 10 to 40 parts of desulfurized waste tire rubber powder, 20 to 30 parts of styrene-butadiene-styrene block copolymer, 15 to 20 parts of adhesive, 10 to 17 parts of compatibilizer, 13 to 18 parts of tackifier and 2 to 5 parts of additive;

[0009] The adhesive is at least one of 70# asphalt, 90# asphalt and 110# asphalt;

[0010] The compatibilizer is at least one of waste tire pyrolysis oil, catalytic cracking slurry, pine tar, aromatic oil, furfural extracted oil, furfural, waste bio-oil and vegetable oil.

[0011] The desulfurized waste tire rubber powder in the present invention can absorb the light components in the asphalt and swell because the sulfur bonds in the rubber are destroyed. At the same time, the rubber powder decomposes the rubber hydrocarbon substances, and the asphalt components increase. The two react with the asphalt to cross-link each other, thereby obtaining better viscosity performance, thereby improving the high and low temperature performance of the modified asphalt. In the present invention, SBS absorbs the light components in the matrix asphalt, resulting in a reduction of the light components, forming a continuous phase with the asphalt, improving the thermal stability of the modified asphalt and reducing the molecular mobility in the asphalt, thereby causing the viscosity of the asphalt to become significantly larger. The adhesive of the present invention uses asphalt to make the SBS swell and develop in advance, and after mixing with the matrix asphalt, it can be quickly dispersed and react with the asphalt to cross-link each other, thereby obtaining better viscosity performance and improving the high and low temperature performance of the modified asphalt. The compatibilizer selected in the present invention can activate the rubber powder and make the rubber powder swell in advance.

[0012] Preferably, the desulfurized waste tire rubber powder has a mesh size of 40 to 100 meshes.

[0013] Preferably, the styrene-butadiene-styrene block copolymer includes at least one of SBS791H, SBS791E, SBS792, SBS1301-3, SBS4303, SBS792E and SBR.

[0014] Preferably, the waste plastic is at least one of waste polyethylene (PE), waste low-density polyethylene (LDPE), waste high-density polyethylene (HDPE) and waste polypropylene (PP).

[0015] The present invention uses waste plastics as a viscosity enhancer, and on the premise of ensuring the performance of pre-swollen multi-polymer high-viscoelastic asphalt modified particles, uses a large amount of desulfurized waste tire rubber powder and waste plastics, which has the advantages of being economical and environmentally friendly.

[0016] Preferably, the auxiliary agent is composed of an anti-aging agent and a warm-mixing agent, wherein the anti-aging agent is at least one of nanographene, montmorillonite, layered double metal hydroxides (LDHs) and organic montmorillonite, and the warm-mixing agent is at least one of Sasobit warm-mixing agent, WSG-H01 warm-mixing agent and Sasowam warm-mixing agent.

[0017] The anti-aging agent in the auxiliary agent used in the present invention can effectively resist the erosion of natural factors such as ultraviolet rays and oxidation, and improve the anti-aging performance of the modified asphalt; the warm mix agent can reduce the construction temperature of the modified asphalt and improve the construction and workability.

[0018] More preferably, the mass ratio of the anti-aging agent to the warm-mixing agent is 1-5:1-5.

[0019] The second technical solution of the present invention is to provide a method for preparing the above-mentioned pre-swollen multi-polymer high-viscoelastic asphalt modified particles, comprising the following steps:

[0020] The desulfurized waste tire rubber powder and the compatibilizer are kept at 50 to 80° C. for 1 to 4 hours to obtain a mixture A;

[0021] The binder is heated and melted, styrene-butadiene-styrene block copolymer is added and the temperature is raised to 150-200°C, and high-speed shearing is performed at 6000-8000 r / min, and then a viscosity enhancer, an auxiliary agent and the mixture A are added, stirred evenly, and granulated after cooling to obtain pre-swollen multipolymer high-viscoelastic asphalt modified particles.

[0022] Preferably, the high-speed shearing time is 15 to 60 minutes.

[0023] Preferably, the uniform stirring can be carried out by ordinary low-speed stirring, and the stirring speed can be selected to be 500-2000 rpm.

[0024] The third technical solution of the present invention is to provide an application of the above-mentioned pre-swollen multi-polymer high-viscosity and high-elastic asphalt modified particles in the preparation of high-viscosity and high-elastic modified asphalt.

[0025] The fourth technical solution of the present invention is to provide a method for preparing a high-viscosity and high-elastic modified asphalt, comprising the following steps:

[0026] The base asphalt is heated and melted, and then the above-mentioned pre-swollen multipolymer high-viscosity and high-elasticity asphalt modified particles are added and the temperature is raised to 180-190° C., and stirred and mixed to obtain a high-viscosity and high-elasticity modified asphalt.

[0027] Preferably, the stirring speed of the stirring and mixing is 1000 to 3000 r / min, and the time is 5 to 10 min.

[0028] The beneficial technical effects of the present invention are as follows:

[0029] (1) The modified asphalt prepared by the pre-swollen multi-polymer high-viscoelastic asphalt modified particles provided by the present invention has an adjustable 60°C dynamic viscosity in the range of 20,000-400,000 Pa·s, an elastic recovery rate of >90%, and an elongation of >30 cm at 5°C, and has excellent viscoelastic properties and ductility.

[0030] (2) In the pre-swollen multipolymer high-viscoelastic asphalt modified particles provided by the present invention, the desulfurized waste tire rubber powder is pre-swollen in the compatibilizer, and the SBS is developed in advance in the asphalt adhesive to form a continuous phase system with the asphalt that is not easy to deform and has a certain degree of elasticity. This ensures that the high amount of desulfurized waste tire rubber powder and SBS in the prepared modified particles can be stably dispersed in the matrix asphalt and quickly improve the performance, thereby improving the construction and workability. The particles have the advantages of good viscoelastic properties, on-demand optimization, stable system, and high economic benefits.

[0031] (3) The high-viscoelastic modified asphalt prepared by the present invention is suitable for small-scale road repair, large-scale maintenance and new construction projects. It has a wide range of applications, strong applicability, and its use conditions are less restricted by site and equipment.

[0032] (4) The modifier particles obtained by the present invention have a uniform granular appearance and are non-sticky. The mass of a single particle is ≤0.25 g, the melt index is ≥3.0 g / 10 min, the ash content is ≤3%, and the dry mixing dispersibility can meet the technical requirement of no particle residue, and can meet the technical requirements of T / CHTS20003-2018 and other standards for dry modifiers. DETAILED DESCRIPTION

[0033] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0034] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0035] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention pertains. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention.

[0036] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0037] Unless otherwise specified, the “parts” in the examples and comparative examples of the present invention refer to “parts by mass”.

[0038] The desulfurized waste tire rubber powder used in the embodiments of the present invention and the comparative examples adopts 40 mesh desulfurized waste tire rubber powder; the SBS used is the linear SBS791E produced by Baling Petrochemical Company; the adhesive and the matrix asphalt used are both 70# asphalt (25°C needle penetration 69dmm, 15°C elongation 125cm, softening point 46.2°C); the compatibilizer used is aromatic oil (aromatic content 85wt.%); the tackifier used is 40 mesh waste LDPE particles; the additive used is LDHs (UV barrier agent UA-102A, purchased from Shandong Wanxin Weina Material Technology Co., Ltd.) and Sasobit warm mix agent mixed in a mass ratio of 1:1.

[0039] Example 1

[0040] Preparation of pre-swollen multi-polymer high-viscoelastic asphalt modified particles:

[0041] (1) 30 parts of desulfurized waste tire rubber powder (denoted as 1-1), 25 parts of desulfurized waste tire rubber powder (denoted as 1-2), and 20 parts of desulfurized waste tire rubber powder (denoted as 1-3) were mixed with 10 parts of a compatibilizer and then kept warm at 60° C. for 4 hours to allow the rubber powder to fully swell, thereby obtaining a mixture A;

[0042] (2) firstly heat 15 parts of adhesive to 135° C. to completely melt it, then heat it to 180° C. and add 20 parts of SBS, shear it at a shear rate of 6000 r / min for 15 min to allow the SBS to pre-swell, then reduce the shear rate to 1000 r / min and add 15 parts of tackifier, 5 parts of auxiliary agent and the mixture A prepared in step (1), shear it for 30 min, and cool it to obtain a mixture B;

[0043] (3) Grinding the mixture B prepared in step (2), placing it in a granulator for granulation, and obtaining pre-swollen multipolymer high-viscoelastic asphalt modified particles.

[0044] The pre-swollen multipolymer high-viscoelastic asphalt modified particles prepared in this example were tested. The test method and results are shown in Table 1.

[0045] Table 1 Test results of pre-swollen multi-polymer high-viscoelastic asphalt modified particles

[0046]

[0047] Table 1 shows that the pre-swollen multipolymer high-viscoelastic asphalt modified particles all meet the specification T / CHTS 20003-2018. The dry modifier has a uniform granular appearance, a single particle mass ≤0.3g, a melt index ≥2.0g / 10min, an ash content ≤5%, and dry mixing dispersion can meet the technical requirements of no particle residue.

[0048] 15 parts of the pre-swollen multi-polymer high-viscosity elastic asphalt modified particles prepared in this embodiment were added to 100 parts of the base asphalt in a molten state at 135°C, and then the temperature was raised to 180°C, and stirred at 3000r / min for 5 minutes to obtain a high-viscosity and high-elastic modified asphalt. Referring to JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the 60°C dynamic viscosity, 25°C elastic recovery rate, 5°C elongation, 25°C needle penetration, and softening point of the high-viscosity and high-elastic modified asphalt prepared in this embodiment were tested respectively, and the test results are shown in Table 2.

[0049] Table 2 Performance results of high viscosity and high elasticity modified asphalt

[0050]

[0051] Table 2 shows that the high-viscosity and high-elasticity modified asphalts all meet the standard GB / T 30516-2014, with a dynamic viscosity > 20000 Pa·s and an elastic recovery rate at 25°C > 85%; and the viscosity is greater than 100000 Pa·s, with excellent viscoelasticity.

[0052] Example 2

[0053] Preparation of pre-swollen multi-polymer high-viscoelastic asphalt modified particles:

[0054] (1) 20 parts of desulfurized waste tire rubber powder and 10 parts of a compatibilizer were mixed and kept at 60° C. for 4 hours to allow the rubber powder to fully swell, thereby obtaining a mixture A;

[0055] (2) firstly heat 15 parts of adhesive to 135° C. to completely melt it, then heat to 180° C. and add 20 parts of SBS (denoted as 2-1), 25 parts of SBS (denoted as 2-2) and 30 parts of SBS (denoted as 2-3) respectively, shear at a shear rate of 6000 r / min for 15 min to allow the SBS to pre-swell, then reduce the shear rate to 1000 r / min and add 15 parts of tackifier, 5 parts of auxiliary agent and the mixture A prepared in step (1), shear for 30 min, and cool to obtain a mixture B;

[0056] (3) Grinding the mixture B prepared in step (2), placing it in a granulator for granulation, and obtaining pre-swollen multipolymer high-viscoelastic asphalt modified particles.

[0057] The pre-swollen multipolymer high-viscoelastic asphalt modified particles prepared in this example were tested. The test method and results are shown in Table 3.

[0058] Table 3 Test results of pre-swollen multi-polymer high-viscoelastic asphalt modified particles

[0059]

[0060] Table 3 shows that the pre-swollen multipolymer high-viscoelastic asphalt modified particles all meet the specification T / CHTS 20003-2018, the dry modifier has a uniform granular appearance, a single particle mass ≤0.3g, a melt index ≥2.0g / 10min, an ash content ≤5%, and the dry mixing dispersibility can meet the technical requirements of no particle residue.

[0061] 15 parts of the pre-swollen multi-polymer high-viscosity elastic asphalt modified particles prepared in this embodiment were added to 100 parts of the base asphalt in a molten state at 135°C, and then the temperature was raised to 180°C, and stirred at 3000r / min for 5 minutes to obtain a high-viscosity and high-elastic modified asphalt. Referring to JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the 60°C dynamic viscosity, 25°C elastic recovery rate, 5°C elongation, 25°C needle penetration, and softening point of the high-viscosity and high-elastic modified asphalt prepared in this embodiment were tested respectively, and the test results are shown in Table 4.

[0062] Table 4 Performance results of high viscosity and high elasticity modified asphalt

[0063]

[0064] Table 4 shows that the high-viscosity and high-elasticity modified asphalts all meet the standard GB / T 30516-2014, with a dynamic viscosity > 20000 Pa·s and an elastic recovery rate at 25°C > 85%; and the viscosity is greater than 100000 Pa·s, with excellent viscoelasticity.

[0065] Example 3

[0066] Preparation of high-viscosity and high-elastic modified asphalt:

[0067] 10 parts (referred to as 3-1), 15 parts (referred to as 3-2) and 20 parts (referred to as 3-3) of the pre-swollen multipolymer high-viscosity elastic asphalt modified particles (1-2) prepared in Example 1 were added to 100 parts of the base asphalt in a molten state at 135°C, and then the temperature was raised to 180°C, and stirred at 3000r / min for 5 minutes to obtain high-viscosity and high-elastic modified asphalt. Referring to JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the 60°C dynamic viscosity, 25°C elastic recovery rate, 5°C elongation, 25°C needle penetration, and softening point of the high-viscosity and high-elastic modified asphalt prepared in this example were tested respectively, and the test results are shown in Table 5.

[0068] Table 5 Performance results of high viscosity and high elasticity modified asphalt

[0069]

[0070] Table 5 shows that the high-viscosity and high-elasticity modified asphalts all meet the standard GB / T 30516-2014, with a dynamic viscosity > 20000 Pa·s and an elastic recovery rate at 25°C > 85%; and the viscosity is greater than 100000 Pa·s, with excellent viscoelasticity.

[0071] Comparative Example 1

[0072] Preparation of multi-polymer high-viscoelastic asphalt modified particles (compared with Example 1, no compatibilizer was used to pre-swell the rubber powder):

[0073] (1) First, 15 parts of adhesive were heated to 135°C to completely melt it, then the temperature was raised to 180°C and 20 parts of SBS were added, and the mixture was sheared at a shear rate of 6000 r / min for 15 minutes to allow the SBS to pre-swell and develop, and then the shear rate was reduced to 1000 r / min and 15 parts of tackifier, 5 parts of auxiliary agent, 10 parts of compatibilizer and 30 parts of desulfurized waste tire rubber powder (denoted as 4-1), 25 parts of desulfurized waste tire rubber powder (denoted as 4-2) and 20 parts of desulfurized waste tire rubber powder (denoted as 4-3) were added, and the mixture was sheared for 30 minutes and cooled to obtain a mixture A;

[0074] (2) Grinding the mixture A prepared in step (1), placing it in a granulator for granulation, and obtaining multi-polymer high-viscoelastic asphalt modified particles.

[0075] The multi-polymer high-viscoelastic asphalt modified particles prepared in this comparative example were tested, and the test methods and results are shown in Table 6.

[0076] Table 6 Test results of multi-polymer high-viscoelastic asphalt modified particles

[0077]

[0078] Table 6 shows that some indicators of the multi-polymer high-viscoelastic asphalt modified particles that were not pre-swollen with a compatibilizer do not meet the specification T / CHTS20003-2018. The dry modifier has a uniform granular appearance, a single particle mass ≤0.3g, an ash content ≤5%, but the 4-1 and 4-2 melt indexes ≤2.0g / 10min, and the dry mixing dispersibility cannot meet the technical requirements of no particle residue.

[0079] 15 parts of the multi-polymer high-viscosity elastic asphalt modified particles prepared in this comparative example were added to 100 parts of the base asphalt in a molten state at 135°C, and then the temperature was raised to 180°C, and stirred at 3000r / min for 5 minutes to obtain modified asphalt. Referring to JTGE20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the 60°C dynamic viscosity, 25°C elastic recovery rate, 5°C elongation, 25°C needle penetration, and softening point of the high-viscosity and high-elastic modified asphalt prepared in this example were tested respectively, and the test results are shown in Table 7.

[0080] Table 7 Modified asphalt performance results

[0081]

[0082] Comparing Table 2 with Table 7, if the rubber powder is not pre-swelled, the viscoelastic properties and physical properties of the modified asphalt prepared from the modified particles are poor, and the dynamic viscosity and elastic recovery at 60°C do not meet the specification requirements.

[0083] Comparative Example 2

[0084] Preparation of pre-swollen multipolymer high-viscoelastic asphalt modified particles (compared with Example 2, SBS and the binder were not sheared and pre-swollen):

[0085] (1) 25 parts of desulfurized waste tire rubber powder and 10 parts of a compatibilizer were mixed and kept at 60° C. for 4 hours to allow the rubber powder to fully swell, thereby obtaining a mixture A;

[0086] (2) firstly heat 15 parts of adhesive to 135° C. to completely melt it, then heat to 180° C. and add 15 parts of tackifier, 5 parts of auxiliary agent, the mixture A prepared in step (1), and 20 parts of SBS (denoted as 5-1), 25 parts of SBS (denoted as 5-2), and 30 parts of SBS (denoted as 5-3) at a shear rate of 1000 r / min, shear for 45 minutes, and cool to obtain a mixture B;

[0087] (3) Grinding the mixture B prepared in step (2), placing it in a granulator for granulation, and obtaining pre-swollen multipolymer high-viscoelastic asphalt modified particles.

[0088] The pre-swollen multipolymer high-viscoelastic asphalt modified particles prepared in this comparative example were tested. The test method and results are shown in Table 8.

[0089] Table 8 Test results of pre-swollen multi-polymer high-viscoelastic asphalt modified particles

[0090]

[0091] Table 8 shows that some indicators of the modified particles that have not been sheared and pre-swollen with the SBS and the binder do not meet the specification T / CHTS20003-2018. The pre-swollen multi-polymer high-viscoelastic asphalt modified particles have a uniform granular appearance, a single particle mass ≤0.3g, an ash content ≤5%, but a 5-3 melt index ≤2.0g / 10min, and the dry mixing dispersibility cannot meet the technical requirements of no particle residue.

[0092] 15 parts of the pre-swollen multi-polymer high-viscosity elastic asphalt modified particles prepared in this comparative example were added to 100 parts of the base asphalt in a molten state at 135°C, and then the temperature was raised to 180°C, and stirred at 3000r / min for 5 minutes to obtain modified asphalt. Referring to JTG E20-2011 "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the 60°C dynamic viscosity, 25°C elastic recovery rate, 5°C elongation, 25°C needle penetration, and softening point of the high-viscosity and high-elastic modified asphalt prepared in this example were tested respectively, and the test results are shown in Table 9.

[0093] Table 9 Modified asphalt performance results

[0094]

[0095] Comparing Table 4 and Table 9, if the SBS and the binder are not sheared and pre-swelled, the viscoelastic properties and physical properties of the modified asphalt prepared from the modified particles are poor, and the dynamic viscosity and elastic recovery at 60°C do not meet the specification requirements.

[0096] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A pre-swollen multi-polymer high-viscoelastic asphalt modified particle, characterized in that: The components include, by weight: 10 to 40 parts of desulfurized waste tire rubber powder, 20 to 30 parts of styrene-butadiene-styrene block copolymer, 15 to 20 parts of adhesive, 10 to 17 parts of compatibilizer, 13 to 18 parts of tackifier and 2 to 5 parts of auxiliary agent; The adhesive is at least one of 70# asphalt, 90# asphalt and 110# asphalt; The compatibilizer is at least one of waste tire pyrolysis oil, catalytic cracking slurry, pine tar, aromatic oil, furfural extracted oil, furfural, waste bio-oil and vegetable oil.

2. The pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 1, characterized in that: The desulfurized waste tire rubber powder has a mesh size of 40 to 100 meshes.

3. The pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 1, characterized in that: The styrene-butadiene-styrene block copolymer includes at least one of SBS791H, SBS791E, SBS792, SBS1301-3, SBS4303, SBS792E and SBR.

4. The pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 1, characterized in that: The viscosity enhancer is at least one of waste polyethylene, waste low-density polyethylene, waste high-density polyethylene and waste polypropylene.

5. The pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 1, characterized in that: The auxiliary agent is composed of an anti-aging agent and a warm-mixing agent, wherein the anti-aging agent is at least one of nanographene, montmorillonite, layered double metal hydroxide and organic montmorillonite, and the warm-mixing agent is at least one of Sasobit warm-mixing agent, WSG-H01 warm-mixing agent and Sasowam warm-mixing agent.

6. The pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 5, characterized in that: The mass ratio of the anti-aging agent to the warm-mixing agent is 1-5:1-5.

7. Provided is a method for preparing the pre-swollen multipolymer high-viscoelastic asphalt modified particles according to any one of claims 1 to 6, characterized in that: The following steps are involved: The desulfurized waste tire rubber powder and the compatibilizer are kept at 50 to 80° C. for 1 to 4 hours to obtain a mixture A; The binder is heated and melted, styrene-butadiene-styrene block copolymer is added and the temperature is raised to 150-200°C, and high-speed shearing is performed at 6000-8000 r / min, and then a viscosity enhancer, an auxiliary agent and the mixture A are added, stirred evenly, and granulated after cooling to obtain pre-swollen multipolymer high-viscoelastic asphalt modified particles.

8. The method for preparing pre-swollen multipolymer high-viscoelastic asphalt modified particles according to claim 7, characterized in that: The high-speed shearing time is 15 to 60 minutes.

9. Use of the pre-swollen multipolymer high-viscosity and high-elastic asphalt modified particles according to any one of claims 1 to 6 in the preparation of high-viscosity and high-elastic modified asphalt.

10. A method for preparing high-viscosity and high-elastic modified asphalt, characterized in that: The following steps are involved: Heat and melt the base asphalt, then add the pre-swollen multipolymer high-viscosity and high-elastic asphalt modified particles described in any one of claims 1 to 6 and heat to 180 to 190° C., stir and mix, and obtain a high-viscosity and high-elastic modified asphalt.

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