High-viscosity and high-elasticity modified asphalt based on organic waste and preparation method thereof

Abstract

This invention relates to a high-viscosity, high-elasticity modified asphalt based on organic waste and its preparation method. The modified asphalt comprises a base asphalt and, by weight of the base asphalt, further comprises 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer, and 0.05%-1.5% stabilizer. This invention transforms waste PET plastic and waste tire rubber into high-value-added road asphalt materials. In terms of performance, the small molecules in the depolymerized waste PET plastic can crosslink with rubber particles and thermoplastic elastomer, effectively strengthening the spatial network structure of the composite system and playing a key tackifying role. Furthermore, this ternary modified system solves the problem of poor compatibility between PET plastic and rubber in asphalt by improving interfacial compatibility.

Description

Technical Field

[0001] This invention relates to the field of asphalt product technology, specifically to a high-viscosity, high-elasticity modified asphalt based on organic waste and its preparation method. Background Technology

[0002] With the rapid development of society and the economy, a large amount of organic waste has been generated, such as waste plastics and waste tire rubber. This organic waste is often produced in huge quantities and has a long degradation cycle; if left untreated, it will cause significant harm to the ecological environment. Plastic and rubber products are used in engineering practices for modifying asphalt, such as PE-modified asphalt, PET-modified asphalt, and rubber-modified asphalt. Combining this type of solid waste with the field of road engineering is one of the technical approaches to achieving the recycling of solid waste and the sustainable development of the road engineering sector.

[0003] In addition, due to the rapid growth in transportation volume and the continuous increase in vehicle load, traditional asphalt pavements are prone to permanent deformation such as rutting and shoving under high temperature and heavy load conditions, and are prone to cracking at low temperatures, and have insufficient fatigue resistance. They are not suitable for the high standards required for long-life pavements, bridge deck paving, and special structures.

[0004] High-viscosity, high-elasticity modified asphalt offers significant advantages in terms of road performance, cost control, ease of construction, and environmental benefits. Therefore, it is necessary to optimize existing asphalt formulations and develop high-viscosity, high-elasticity modified asphalt based on organic waste. Summary of the Invention

[0005] The purpose of this invention is to prepare high-performance, high-viscosity, high-elasticity asphalt using PET plastic and waste tire powder as two solid wastes as raw materials.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a high-viscosity, high-elasticity modified asphalt based on organic waste, comprising a base asphalt, and further comprising, by weight of the base asphalt,... 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer.

[0007] Furthermore, the method for preparing the depolymerized waste PET plastic includes, Waste PET plastic is mixed with a depolymerizing agent at a mass ratio of 1:1-4, and the mixture is heated to produce a viscous liquid. The viscous liquid is cooled and crystallized to obtain depolymerized waste PET plastic. Furthermore, the depolymerizing agent includes at least one of ethanolamine, diethanolamine, and triethanolamine; The heating reaction was carried out at a temperature of 140-160℃ and a stirring rate of 100-500 rpm for 3-8 hours. The waste PET plastic is also crushed and washed before use; The cleaning process uses an alkaline solution containing surfactants.

[0008] Furthermore, the thermoplastic elastomer is obtained by mixing SEPS and SEBS at a mass ratio of 1:1-4.

[0009] Furthermore, the particle size of the waste tire rubber is 20-100 mesh.

[0010] Furthermore, the tackifying resin is at least one of C9 petroleum resin, phenolic resin, and terpene resin.

[0011] Furthermore, the plasticizer includes at least one of dioctyl phthalate, naphthenic oil, and aromatic oil.

[0012] Furthermore, the stabilizer includes at least one of sulfur and dicumyl peroxide.

[0013] The aforementioned high-viscosity and high-elasticity modified asphalt based on organic waste has been tested and found to have a dynamic viscosity of over 82,500 Pa·S at 60℃, a penetration of less than 50 at 25℃, a ductility of over 51 cm at 5℃, and a softening point of over 91℃.

[0014] This invention also provides a method for preparing high-viscosity, high-elasticity modified asphalt based on organic waste, comprising: Weigh the base asphalt, and by weight of the base asphalt, also weigh 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer. After heating the base asphalt, other raw materials are added and shearing is performed, followed by swelling and development to obtain high-viscosity and high-elasticity modified asphalt based on organic waste.

[0015] Compared with the prior art, the beneficial effects of the present invention include: This invention successfully transforms waste PET plastic and waste tire rubber into high-value-added road asphalt materials, offering excellent environmental and economic benefits. In terms of performance, the small molecules in the depolymerized waste PET plastic can cross-link with rubber particles and thermoplastic elastomers, effectively strengthening the spatial network structure of the composite system and playing a crucial role in thickening. Furthermore, this ternary modified system can solve the problem of poor compatibility between PET plastic and rubber in asphalt by improving interfacial compatibility.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Detailed Implementation

[0017] Waste PET plastics (such as those derived from beverage bottles) are incorporated into asphalt due to their high strength and heat resistance, enhancing the road's resistance to rutting under high temperatures and heavy loads. Some studies have shown that adding appropriate amounts of PET plastic (typically 4%-6%) can significantly improve the softening point, stiffness, and fatigue resistance of asphalt. However, PET is a polar polymer, while asphalt is a non-polar mixture. This leads to PET plastic particles easily undergoing phase separation and sedimentation during high-temperature storage and transportation, severely affecting the uniformity of pavement quality. PET's melting point is as high as approximately 250°C, far exceeding the conventional processing temperature of asphalt (150-180°C), making it difficult to melt in asphalt and typically existing as solid particles, increasing the difficulty of mixing. Using rubber powder made from ground waste tires in asphalt imparts valuable elasticity to the pavement, effectively resisting cracking and absorbing noise. Rubber particles absorb lightweight components in the asphalt and swell, forming a three-dimensional network that greatly enhances the asphalt's elastic recovery ability. However, rubber powder has a lower density than asphalt and its volume increases after swelling. It is very easy to float and segregate during static storage, resulting in excessively high viscosity of the upper layer asphalt and reduced performance of the lower layer. This makes it impossible to store it for a long time like ordinary asphalt, and it must be mixed and used immediately.

[0018] Recent studies no longer treat PET plastic as an inert filler, but instead transform it into a reactive additive through chemical methods (ammonialysis, alcoholysis, etc.). This additive can act as a molecular bridge, firmly binding asphalt components at one end through chemical reaction, and forming a strong interfacial bond with rubber particles at the other end, fundamentally solving the problems of compatibility and stability. However, there is currently a lack of research reports on obtaining high-viscosity, high-elasticity modified asphalt using depolymerized PET and waste tire rubber. Specific component optimization also has a significant impact on the material's performance.

[0019] The concept of this invention lies in cross-linking small molecules obtained from depolymerized waste PET plastic with rubber particles and thermoplastic elastomers. This ternary modified system can not only effectively strengthen the spatial network structure of the composite system and play a key role in thickening, but also solve the problem of poor compatibility between PET plastic and rubber in asphalt.

[0020] In view of this, on the one hand, the present invention provides a high-viscosity, high-elasticity modified asphalt based on organic waste, comprising a base asphalt, and further comprising, by weight of the base asphalt,... 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer.

[0021] In some preferred embodiments, the method for preparing depolymerized waste PET plastic includes, (1) After the collected waste PET plastic bottles are cleaned, the labels are removed and dried, they are crushed by mechanical crushing equipment to obtain PET fragments with a maximum size of less than 5 mm for subsequent chemical treatment. Optionally, a vibrating screen can be used to screen the pulverized PET material to ensure the uniformity of particle size distribution.

[0022] (2) Place the PET fragments in a cleaning reactor, add the composite cleaning solution at a solid-liquid mass ratio of 1:5-15, heat to 50-70℃, and supplement with mechanical stirring or ultrasonic oscillation for 30-90 minutes; after the treatment is completed, let stand for a while, pour off the upper layer of floating liquid and floating matter, place the cleaned and purified PET fragments in a vacuum drying oven, and dry for 6-12 hours at 70-90℃ and a vacuum degree below -0.09MPa until constant weight is obtained, and clean and dry PET raw materials are obtained for subsequent chemical modification.

[0023] The composite cleaning solution uses an alkaline mixed solution containing surfactants. The alkalinity is provided by at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, etc., with a concentration of 0.5-2 mol / L. The amount of surfactant added accounts for 0.1%-1% of the composite cleaning solution. The surfactant is selected from at least one of nonionic surfactants, anionic surfactants, etc. The nonionic surfactant can be at least one of alkylphenol polyoxyethylene ether OP-10, octylphenol polyoxyethylene TX-100, etc., and the anionic surfactant can be at least one of sodium dodecylbenzene sulfonate, sodium decaalkylbenzene sulfonate, etc.

[0024] (3) Waste PET plastic is mixed with a depolymerizing agent at a mass ratio of 1:1-4, and the mixture is heated to obtain a viscous liquid. The depolymerizing agent includes at least one of ethanolamine, diethanolamine, and triethanolamine; the heating reaction is carried out at a temperature of 140-160℃ and a stirring rate of 100-500rpm for 3-8 hours.

[0025] (4) Cool the viscous liquid and crystallize it to obtain the depolymerized waste PET plastic.

[0026] In some preferred embodiments, after crystallization, a detergent is added for multiple washings, followed by vacuum drying to obtain depolymerized waste PET plastic. The detergent is anhydrous ethanol.

[0027] In some preferred embodiments, the thermoplastic elastomer is obtained by mixing SEPS and SEBS in a mass ratio of 1:1-4. SEPS (hydrogenated styrene-isoprene / butadiene copolymer) and SEBS (hydrogenated styrene-butadiene-styrene copolymer) belong to the second generation of thermoplastic elastomers and are upgraded alternatives to the currently commonly used SBS (styrene-butadiene-styrene copolymer). The middle segment (soft segment) of the SBS molecule contains a large number of carbon-carbon double bonds (C=C). These unsaturated double bonds are a performance bottleneck, making it susceptible to aging due to oxygen, ozone, and ultraviolet (UV) radiation. SEBS is obtained by selectively hydrogenating the middle segment of the SBS molecule. This process saturates the highly reactive double bonds in the soft segment, altering the structure. SEPS can be considered as a hydrogenation product of SIS (styrene-isoprene-styrene block copolymer), a close relative of SBS, where the soft segment is transformed into a copolymer of ethylene and propylene, similarly achieving molecular chain saturation. Because the middle segments of SEPS are hydrogenated and saturated, they possess excellent resistance to heat, oxygen, and UV aging, exhibiting both strength and elasticity. SEBS, on the other hand, also has a partially hydrogenated structure, enabling it to resist most aging reactions. By leveraging the superior low-temperature toughness and aging resistance of SEPS and the higher strength and elasticity of SEBS, the two work synergistically to construct a polymer network with a wider temperature range and greater stability. Mixing thermoplastic elastomers of SEPS and SEBS at a mass ratio of 1:1-4 ensures that the modified asphalt maintains high-temperature stability while also possessing good low-temperature flexibility and fatigue resistance.

[0028] In some preferred embodiments, the particle size of the waste tire rubber is 20-100 mesh. It can be a single gradation, such as all of 20 mesh, 40 mesh, 60 mesh, 80 mesh, and 100 mesh, or any gradation, such as a mixture of multiple mesh sizes, such as 20 mesh, 40 mesh, 60 mesh, 20 mesh, 40 mesh, and 80 mesh, without obvious limitations.

[0029] In some preferred embodiments, the tackifying resin is at least one of C9 petroleum resin, phenolic resin, and terpene resin.

[0030] In some preferred embodiments, the plasticizer includes at least one of dioctyl phthalate, naphthenic oil, and aromatic oil.

[0031] In some preferred embodiments, the stabilizer includes at least one of sulfur and dicumyl peroxide.

[0032] On the other hand, the present invention provides a method for preparing high-viscosity, high-elasticity modified asphalt based on organic waste, comprising, Weigh the base asphalt, and by weight of the base asphalt, also weigh 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer. After heating the base asphalt, other raw materials are added and shearing is performed, followed by swelling and development to obtain high-viscosity and high-elasticity modified asphalt based on organic waste.

[0033] In some preferred embodiments, the base asphalt is heated to 160-190°C, then other raw materials are added, and the mixture is subjected to high-speed shearing at 5000-7000 rpm for 0.5-1.5 hours, followed by swelling and development at 145-175°C for 0.5-1 hours, thus obtaining high-viscosity, high-elasticity modified asphalt based on organic waste. The order in which other raw materials are added has no significant impact on the product's performance.

[0034] It should be noted that the present invention does not strictly limit the type of base asphalt. For example, it can be at least one of 70#, 90# road petroleum asphalt, etc.

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification and claims of this invention are intended to cover non-exclusive inclusion.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] The present invention will be further described in detail below through specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0039] Preparation Example 1 The preparation method of PET additives includes the following steps: (1) Crushing: After the collected waste PET plastic bottles are cleaned, the labels are removed and dried, they are crushed by mechanical crushing equipment and then screened by vibrating screen to obtain PET fragments with a maximum size of less than 5mm.

[0040] (2) Cleaning: Place the PET fragments obtained in step (1) in a cleaning reactor, add 0.5 mol / L sodium hydroxide aqueous solution containing 0.5% sodium dodecylbenzenesulfonate as cleaning solution according to the solid-liquid mass ratio of 1:10, heat to 60℃, and mechanically stir for 40 min; after the treatment is completed, let stand, pour off the upper layer of floating liquid and floating matter, place the cleaned and purified PET fragments in a vacuum drying oven, dry for 8 hours at 80℃ and vacuum degree below -0.09MPa until constant weight is obtained, and clean and dry PET raw material is obtained.

[0041] (3) Depolymerization: The PET raw material obtained in step (2) is mixed with triethanolamine at a mass ratio of 1:2, heated to 140°C, and reacted at a stirring rate of 500 rpm for 5 hours. During the process, mass and heat transfer are kept uniform. After the reaction is completed, the solid basically disappears and the system is transformed into a homogeneous viscous liquid.

[0042] (4) Purification: The homogeneous viscous liquid obtained in step (3) is cooled and crystallized, then washed three times with anhydrous ethanol and dried under vacuum to obtain the depolymerized waste PET plastic, which is denoted as PET additive.

[0043] Preparation Example 2 The preparation method of PET additives includes the following steps: (1) Crushing: After the collected waste PET plastic bottles are cleaned, the labels are removed and dried, they are crushed by mechanical crushing equipment and then screened by vibrating screen to obtain PET fragments with a maximum size of less than 5mm.

[0044] (2) Cleaning: The PET fragments obtained in step (1) are placed in a cleaning reactor. A 0.7 mol / L sodium carbonate aqueous solution containing 0.7% alkylphenol polyoxyethylene ether OP-10 is added as the cleaning solution at a solid-liquid mass ratio of 1:10. The temperature is raised to 70°C, and a 30 kHz frequency and a power density of 0.4 W / cm² are used as the cleaning solution. 3 The PET fragments were subjected to ultrasonic oscillation treatment for 60 minutes. After treatment, the fragments were allowed to stand, and the supernatant and floating matter were discarded. The cleaned and purified PET fragments were placed in a vacuum drying oven and dried at 80°C and a vacuum degree below -0.09MPa for 9 hours until constant weight was obtained, thus obtaining clean and dry PET raw materials.

[0045] (3) Depolymerization: The PET raw material obtained in step (2) is mixed with triethanolamine at a mass ratio of 1:3, heated to 150°C, and reacted at a stirring rate of 500 rpm for 5 hours. During the process, mass and heat transfer are kept uniform. After the reaction is completed, the solid basically disappears and the system is transformed into a homogeneous viscous liquid.

[0046] (4) Purification: The homogeneous viscous liquid obtained in step (3) is cooled and crystallized, then washed three times with anhydrous ethanol and dried under vacuum to obtain the depolymerized waste PET plastic, which is denoted as PET additive.

[0047] Preparation Example 3 (1) Crushing: After the collected waste PET plastic bottles are cleaned, the labels are removed and dried, they are crushed by mechanical crushing equipment and then screened by vibrating screen to obtain PET fragments with a maximum size of less than 5mm.

[0048] (2) Cleaning: Place the PET fragments obtained in step (1) in a cleaning reactor, add 0.8 mol / L sodium carbonate aqueous solution containing 0.9% alkylphenol polyoxyethylene ether OP-10 as cleaning solution according to the solid-liquid mass ratio of 1:10, heat to 70℃, and mechanically stir for 40 min; after the treatment is completed, let stand, pour off the upper layer of floating liquid and floating matter, place the cleaned and purified PET fragments in a vacuum drying oven, dry for 10 hours at 80℃ and vacuum degree below -0.09MPa until constant weight is obtained, and clean and dry PET raw material is obtained.

[0049] (3) Depolymerization: The PET raw material obtained in step (2) is mixed with ethanolamine at a mass ratio of 1:2.5, heated to 150°C, and reacted at a stirring rate of 400 rpm for 6 hours. During the process, mass and heat transfer are kept uniform. After the reaction is completed, the solid basically disappears and the system is transformed into a homogeneous viscous liquid.

[0050] (4) Purification: The homogeneous viscous liquid obtained in step (3) is cooled and crystallized, then washed three times with anhydrous ethanol and dried under vacuum to obtain the depolymerized waste PET plastic, which is denoted as PET additive.

[0051] Example 1 A method for preparing modified bitumen based on organic waste includes the following steps: S1. Using 70# road petroleum asphalt as the base asphalt, 2% SEPS, 6% SEBS, 10% 40-mesh waste tire rubber, 10% PET modifier (prepared in Preparation Example 1), 2% C9 petroleum resin, 1.5% dioctyl phthalate and 0.07% sulfur were weighed out, accounting for 2% of the mass of the base asphalt. S2. Heat the base asphalt to 170°C, and add SEPS, SEBS, 40-mesh waste tire rubber, PET modifier, C9 petroleum resin, dioctyl phthalate and sulfur in sequence to obtain a mixture. Then, shear the mixture at 5500 rpm for 1 hour to obtain a further mixture. Swell the mixture at 160°C for 0.5 hours to obtain modified asphalt based on organic waste.

[0052] Example 2 A method for preparing modified bitumen based on organic waste includes the following steps: S1. Using 70# road petroleum asphalt as the base asphalt, 2% SEPS, 6% SEBS, 10% 40-mesh waste tire rubber, 6% PET modifier (obtained in Preparation Example 2), 2% C9 petroleum resin, 1.5% naphthenic oil and 0.07% dicumyl peroxide were weighed out respectively. S2. Heat the base asphalt to 170°C, and add SEPS, SEBS, 40-mesh waste tire rubber, PET modifier, C9 petroleum resin, naphthenic oil and dicumyl peroxide in sequence. Then, shear the mixture at 5500 rpm for 1 hour to obtain a mixture. Swell the mixture at 160°C for 0.5 hours to obtain modified asphalt based on organic waste.

[0053] Example 3 A method for preparing modified bitumen based on organic waste includes the following steps: S1. Using 70# road petroleum asphalt as the base asphalt, 4% SEPS, 4% SEBS, 10% 40-mesh waste tire rubber, 10% PET modifier (obtained in Preparation Example 3), 2% C9 petroleum resin, 1.5% dioctyl phthalate and 0.07% sulfur were weighed out, accounting for 4% of the mass of the base asphalt. S2. Heat the base asphalt to 170°C, and add SEPS, SEBS, 40-mesh waste tire rubber, PET modifier, C9 petroleum resin, naphthenic oil and diisopropylbenzene peroxide in sequence. Then, shear the mixture at 6500 rpm for 1 hour to obtain a mixture. Swell the mixture at 165°C for 0.5 hours to obtain modified asphalt based on organic waste.

[0054] Example 4 A method for preparing modified bitumen based on organic waste includes the following steps: S1. Using 70# road petroleum asphalt as the base asphalt, 2% SEPS, 6% SEBS, 10% 40-mesh waste tire rubber, 10% PET modifier (obtained in Preparation Example 3), 2% C9 petroleum resin, 1.5% dioctyl phthalate and 0.07% sulfur were weighed out, accounting for 2% of the mass of the base asphalt. S2. Heat the base asphalt to 170°C, and add SEPS, SEBS, 40-mesh waste tire rubber, PET modifier, C9 petroleum resin, naphthenic oil and diisopropylbenzene peroxide in sequence. Then, shear the mixture at 6500 rpm for 1 hour to obtain a mixture. Swell the mixture at 165°C for 0.5 hours to obtain modified asphalt based on organic waste.

[0055] Comparative Example 1 The difference from Comparative Example 4 is that SBS is used instead of SEPS and SEBS.

[0056] Comparative Example 2 The difference compared to Comparative Example 4 is that no PET modifier was added to the raw materials.

[0057] Test case The penetration, softening point, ductility at 5°C, and dynamic viscosity at 60°C of the asphalt materials of the examples and comparative examples were tested, and the penetration ratio was tested after aging was simulated using a rotating thin film oven (RTFOT). These results are shown in Table 1.

[0058]

[0059] As can be seen from the performance test results in Table 1 above, Example 4 outperforms other examples and comparative examples in three key indicators: softening point, viscosity at 60℃, and penetration ratio at 25℃ after RTFOT aging. Furthermore, its ductility at 5℃ and penetration at 25℃ both meet the usage requirements of GB / T 30516-2014 "High Viscosity and High Elasticity Road Asphalt," with a ductility requirement of not less than 20 cm at 5℃ and a penetration requirement of 40-80 cm at 25℃. Compared to Example 4, Example 1, due to the different PET modifiers, exhibits increased ductility, decreased penetration, decreased softening point, and slightly decreased viscosity and anti-aging properties. Example 2, due to the reduced PET additive content, shows a slight increase in ductility, but all other properties decrease to varying degrees. Example 3, by reducing the proportion of SEBS in the SEPS / SEBS mixture while maintaining the total thermoplastic elastomer content, also results in a slight increase in ductility, but all other properties decrease, with the most significant decrease in the penetration ratio at 25℃ after RTFOT aging.

[0060] Compared to Comparative Example 1 (using traditional SBS instead of the SEPS / SEBS mixture), Example 4 not only showed better anti-aging performance but also exhibited some advantages in the three major indicators and viscosity. Compared to Comparative Example 2 (without PET additives), the softening point and viscosity at 60°C of Example 4 were significantly improved. These results fully demonstrate the synergistic effect of waste PET chemical modification with the ternary system of SEPS / SEBS and rubber powder.

[0061] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high-viscosity, high-elasticity modified asphalt based on organic waste, comprising a base asphalt, characterized in that, Based on the mass of the base bitumen, it also includes, 5%-15% thermoplastic elastomers, 5%-20% waste tire rubber, and 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer.

2. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The method for preparing the depolymerized waste PET plastic includes, Waste PET plastic is mixed with a depolymerizing agent at a mass ratio of 1:1-4, and the mixture is heated to produce a viscous liquid. The viscous liquid is cooled and crystallized to obtain depolymerized waste PET plastic. The depolymerizing agent includes at least one of ethanolamine, diethanolamine, and triethanolamine; The heating reaction was carried out at a temperature of 140-160℃ and a stirring rate of 100-500 rpm for 3-8 hours.

3. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 2, characterized in that, The waste PET plastic is also crushed and washed before use; The cleaning process uses an alkaline solution containing surfactants.

4. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The thermoplastic elastomer is obtained by mixing SEPS and SEBS in a mass ratio of 1:1-4.

5. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The particle size of the waste tire rubber is 20-100 mesh.

6. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The tackifying resin is at least one of C9 petroleum resin, phenolic resin, and terpene resin.

7. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The plasticizer includes at least one of dioctyl phthalate, naphthenic oil, and aromatic oil.

8. The high-viscosity, high-elasticity modified asphalt based on organic waste according to claim 1, characterized in that, The stabilizer includes at least one of sulfur and dicumyl peroxide.

9. The high-viscosity, high-elasticity modified asphalt based on organic waste according to any one of claims 1-8, characterized in that, Its dynamic viscosity at 60℃ is higher than 82500 Pa·S, its penetration at 25℃ is less than 50, its ductility at 5℃ is higher than 51 cm, and its softening point is higher than 91℃.

10. A method for preparing high-viscosity, high-elasticity modified asphalt based on organic waste, characterized in that, include, Weigh the base asphalt, and by weight of the base asphalt, also weigh 5%-15% thermoplastic elastomer, 5%-20% waste tire rubber, 5%-15% depolymerized waste PET plastic; 0.5%-3% tackifying resin, 0.2%-3% plasticizer and 0.05%-1.5% stabilizer. After heating the base asphalt, other raw materials are added and shearing is performed, followed by swelling and development to obtain high-viscosity and high-elasticity modified asphalt based on organic waste.

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