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CN-121975336-A - Biological oil-polymer-based composite regenerant, preparation method and waste asphalt mixture regeneration process

CN121975336ACN 121975336 ACN121975336 ACN 121975336ACN-121975336-A

Abstract

The invention relates to the technical field of road material regeneration, in particular to a biological oil-polymer-based composite regenerant, a preparation method and a waste asphalt mixture regeneration process, wherein the biological oil-polymer-based composite regenerant comprises, by mass, 15% -35% of biological base regeneration components, 8% -15% of polymer network reconfigurating agents, 3% -8% of in-situ film-forming interface compatilizers, 1% -3% of secondary aging resistant stabilizers and the balance of high-permeability carriers. The bio-based regenerated component is formed by compounding the small molecular bio-oil and the macromolecule bio-based plasticizer, the small molecular oil has low viscosity and strong permeability, can quickly enter microcracks and network gaps of the aged asphalt, plays roles of open pioneer and preliminary swelling and asphalt dilution, has longer molecular chain and stronger polarity, can more effectively interact with polar components in the aged asphalt, provides durable flexibilization effect, and is beneficial to stabilizing the regenerated asphalt colloid structure.

Inventors

  • YAN JIAJUN
  • SUN XIAOHUI
  • SHI YONGXIN
  • YOU PENG
  • HONG BOWEN

Assignees

  • 湖北省高速公路实业开发有限公司

Dates

Publication Date
20260505
Application Date
20260305

Claims (10)

  1. 1. The biological oil-polymer-based composite regenerant is characterized by comprising, by mass, 15% -35% of biological-based regenerant components, 8% -15% of polymer network reconfigurating agents, 3% -8% of in-situ film-forming interfacial compatilizers, 1% -3% of secondary aging resistant stabilizers and the balance of high-permeability carriers.
  2. 2. The bio-oil-polymer based composite regenerant according to claim 1, wherein said bio-based regenerant comprises a small-molecular bio-oil and a large-molecular bio-based plasticizer in a mass ratio of 1:1-3:1; The micromolecular biological grease is refined tall oil or waste cooking oil, and the macromolecular biological plasticizer is a product obtained by transesterification modification of epoxy vegetable oil or adipic acid bio-based polyester.
  3. 3. The bio-oil-polymer based composite recycling agent according to claim 1, wherein the polymer network recycling agent is a composite of fine rubber powder supported by waste tires and styrene-butadiene-styrene block copolymer SBS, wherein the mass ratio of rubber powder to SBS is 1:1-2:1.
  4. 4. The bio-oil-polymer based composite regenerant according to claim 1, wherein said in-situ film-forming interfacial compatibilizer is a silane coupling agent having amino groups or epoxy groups in the side chains.
  5. 5. The biological oil-polymer-based composite regenerant according to claim 1, wherein said secondary aging resistant stabilizer is a hindered phenol antioxidant and a light stabilizer, and the mass ratio of said hindered phenol antioxidant to said light stabilizer is 1:1-2:1.
  6. 6. The biological oil-polymer-based composite regenerant according to claim 1, wherein the secondary aging resistant stabilizer further comprises a microencapsulated slow-release component, the mass of the microencapsulated slow-release component accounts for 10-20% of the total mass of the secondary aging resistant stabilizer, the wall material of the microencapsulated slow-release component is Fei Tuola, and the core material is a hindered ammonia light stabilizer.
  7. 7. The bio-oil-polymer based composite regenerant according to claim 1, wherein said high permeability carrier is a sulfonated petroleum distillate.
  8. 8. The method for producing a bio-oil-based-polymer-based composite regenerant according to any one of claims 1 to 7, comprising the steps of: s1, mixing a polymer network reconstruction agent and 30% -50% of a high-permeability carrier at 100-120 ℃ and stirring to form uniform premixed gel; S2, uniformly mixing the bio-based regeneration component and the rest high-permeability carrier at 60-80 ℃, slowly adding the premixed gel obtained in the step S1, and continuously and uniformly stirring to obtain a first mixed product; s3, when the temperature of the first product is reduced to 50-70 ℃, adding the in-situ film-forming interfacial compatilizer and the secondary aging resistant stabilizer for one time, and continuously stirring until the first product is completely and uniformly dispersed to obtain a second mixed product; and S4, homogenizing the product obtained in the step S3 by a high-shear emulsifying machine, curing at 40-50 ℃ for at least 2 hours, cooling to normal temperature, and discharging to obtain the biological oil-polymer matrix composite regenerant.
  9. 9. A process for regenerating a waste asphalt mixture, characterized by using the bio-oil-polymer-based composite regenerating agent prepared according to claim 8, comprising the steps of: s1, deep activating treatment of RAP, namely heating the RAP to 125-145 ℃ and then placing the RAP in a closed container with high-speed vortex stirring; S2, atomizing, spraying and mixing the regenerant, namely spraying the regenerant preheated to 70-85 ℃ into the RAP in a vortex state through a high-pressure atomizing nozzle, and carrying out strong mixing to uniformly distribute the regenerant in the RAP; s3, performing third-order low-frequency ultrasonic treatment, namely performing third-order low-frequency ultrasonic treatment on the mixture obtained in the step S2 at 70-85 ℃ to form a firm interface transition layer; s4, interface reaction development, namely standing and developing the mixture after ultrasonic mixing at 70-85 ℃ to enable the in-situ film-forming type interface compatilizer to complete interface chemical reaction; and S5, forming a final mixture, namely adding new aggregate and new asphalt into the material developed in the step S4, and finishing final mixing, paving and rolling.
  10. 10. The process for regenerating a waste asphalt mixture according to claim 9, wherein the third-order low-frequency ultrasonic treatment described in S3 specifically comprises: The first stage comprises applying continuous or pulsed ultrasound with frequency of 20-40kHz and power density of 0.2-0.5W/cm 2 for 3-8min; The second stage is to stop ultrasonic or switch to a low-power intermittent mode, and stand for 5-15min; And thirdly, applying the ultrasonic wave with the frequency of 20-40kHz and the power density of 0.1-0.3W/cm 2 again, and finishing after 2-5 min.

Description

Biological oil-polymer-based composite regenerant, preparation method and waste asphalt mixture regeneration process Technical Field The invention relates to the technical field of road material regeneration, in particular to a biological oil-based polymer-based composite regenerant, a preparation method and a waste asphalt mixture regeneration process. Background The regenerant has the main function of recovering the rheological property and engineering applicability of the aged asphalt by adjusting the chemical components and the colloid structure of the aged asphalt, thereby realizing the recycling of the asphalt mixture. However, the design concept of conventional regenerants focuses on "oil make-up" and performance repair of asphalt, as in prior art CN120248636a, which has significant limitations of single oil make-up. Along with the gradual recovery of the research front from single components and the turning to the overall regulation and control of the structural and functional remodeling of asphalt, the prior art has insufficient repairing capability of weakened asphalt-aggregate interface bonding areas in waste asphalt mixtures (RAP) and gradually becomes a key bottleneck for restricting the high-low temperature performance and the durability of regenerated mixtures. In addition, facing the technical challenges brought by the high mixing amount of the waste asphalt mixture, how to effectively reconstruct a firm interface bonding system while realizing the regeneration of asphalt colloid, ensure that the regenerated mixture has excellent comprehensive road performance and become a difficult problem to be broken through in industry. Therefore, in order to solve the above problems, development of a novel all-round regenerant and a matching process capable of realizing the recovery from short-term performance to long-term durability guarantee from asphalt body to interface have great technical significance and remarkable economic benefit. Disclosure of Invention The invention aims to solve the defects, and provides a biological oil-polymer-based composite regenerant, a preparation method and a waste asphalt mixture regeneration process, wherein the regeneration of asphalt colloid is realized under the condition of high mixing amount of the waste asphalt mixture, a firm interface bonding system is effectively rebuilt, and the regenerated mixture is ensured to have excellent comprehensive road performance. In order to solve the technical problems, the biological oil-polymer-based composite regenerant adopts the following technical scheme that the biological oil-polymer-based composite regenerant comprises, by mass, 15% -35% of biological oil-based regenerant, 8% -15% of polymer network reconfigurating agent, 3% -8% of in-situ film-forming interfacial compatilizer, 1% -3% of secondary aging resistant stabilizer and the balance of high-permeability carrier. Further, the bio-based regeneration component comprises small molecular biological grease and macromolecule bio-based plasticizer with the mass ratio of 1:1-3:1; The micromolecular biological grease is refined tall oil or waste cooking oil, and the macromolecular biological plasticizer is a product obtained by transesterification modification of epoxy vegetable oil or adipic acid bio-based polyester. Further, the polymer network reconstruction agent is a compound of fine rubber powder supported by waste tires and styrene-butadiene-styrene block copolymer SBS, wherein the mass ratio of the rubber powder to the SBS is 1:1-2:1. Furthermore, the in-situ film-forming interfacial compatibilizer is a silane coupling agent with an amino group or an epoxy group in a side chain. Further, the secondary aging resistant stabilizer is a hindered phenol antioxidant and a light stabilizer, and the mass ratio of the hindered phenol antioxidant to the light stabilizer is 1:1-2:1. Further, the secondary aging resistant stabilizer also comprises a microencapsulated slow-release component, wherein the mass of the microencapsulated slow-release component accounts for 10% -20% of the total mass of the secondary aging resistant stabilizer, the wall material of the microencapsulated slow-release component is Fei Tuola, and the core material of the microencapsulated slow-release component is a hindered ammonia light stabilizer. Further, the high-permeability carrier is petroleum distillate oil subjected to sulfonation treatment. The preparation method of the biological oil-polymer-based composite regenerant comprises the following steps: s1, mixing a polymer network reconstruction agent and 30% -50% of a high-permeability carrier at 100-120 ℃ and stirring to form uniform premixed gel; S2, uniformly mixing the bio-based regeneration component and the rest high-permeability carrier at 60-80 ℃, slowly adding the premixed gel obtained in the step S1, and continuously and uniformly stirring to obtain a first mixed product; s3, when the temperature of the first product is reduced to 5