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CN-121800466-B - High-strength asphalt cold patch material capable of being pressed and fixed and preparation method thereof

CN121800466BCN 121800466 BCN121800466 BCN 121800466BCN-121800466-B

Abstract

The invention provides a press-and-fix high-strength asphalt cold-patch material and a preparation method thereof, belonging to the technical field of asphalt high polymer materials. The EAS-GMA is prepared by reacting polyamide resin, epoxy resin and stannous octoate and then modifying the polyamide resin, the epoxy resin and the stannous octoate by KH-570. The core-shell structure composite modifier is prepared by reacting isocyanate-terminated polyurethane prepolymer, epoxy resin, benzyl glycidyl ether and DBTDL to prepare core liquid, emulsifying, adding MMA and KH-570 for adsorption, and initiating reaction by KPS. The asphalt cold-patch material breaks through the technical bottlenecks of long curing period, low initial strength, poor cohesiveness and insufficient durability of the traditional cold-patch material through multicomponent synergy and process optimization, and realizes the unification of instant-pressing instant-fixing and high-strength durability.

Inventors

  • Yu Fanghui
  • WU GUIXIN
  • ZHENG YAODONG
  • TONG JIAN
  • WU GUIXI

Assignees

  • 沈阳瀚申科技有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (10)

  1. 1. The cold patch material for the instant-pressing instant-fixing high-strength asphalt is characterized by comprising the following raw materials, by mass, 7-10 parts of road petroleum asphalt, 0.8-1.2 parts of anionic emulsified asphalt, 1.5-2.5 parts of EAS-GMA, 1.0-2.0 parts of core-shell structure composite modifier, 0.3-0.5 part of epoxidized soybean oil, 95-105 parts of basalt machine-made sand, 35-45 parts of limestone chips, 0.1-0.2 part of KH-550, 5-7 parts of active filler, 0.2-0.3 part of lignin fiber, 0.3-0.6 part of coagulant, 0.1-0.2 part of anti-aging agent and 0.5-1.0 part of loss-resistant agent; The EAS-GMA is prepared by reacting polyamide resin, epoxy resin and stannous octoate (45-55) in a mass ratio of (35-45) to (0.4-0.6) in dimethylbenzene to obtain epoxy-amide prepolymer, modifying the epoxy-amide prepolymer by KH-570 and distilling the epoxy-amide prepolymer under reduced pressure; The core-shell structure composite modifier is prepared by reacting (55-65): (30-40): (3-7): (0.1-0.3) with (30-0.3) isocyanate-terminated polyurethane prepolymer, epoxy resin, benzyl glycidyl ether and DBTDL to prepare core liquid, adding the core liquid into deionized water containing SDS for emulsification, adding MMA and KH-570 for adsorption, initiating reaction with KPS, and centrifuging, washing, vacuum drying and sieving.
  2. 2. The press-and-fix high-strength asphalt cold-patch according to claim 1, wherein the road petroleum asphalt is 70# road petroleum asphalt and the water loss resistance agent is slaked lime.
  3. 3. The press-and-fix high-strength asphalt cold-patch material according to claim 1, wherein the active filler comprises limestone powder and silica fume in a mass ratio of (4-6) to (1-1.5), the coagulant comprises triethyl citrate and nano calcium carbonate in a mass ratio of (1.5-2), and the anti-aging agent comprises an antioxidant 1010 and an ultraviolet absorber UV-531 in a mass ratio of (1.8-1.2).
  4. 4. The instant-pressing instant-fixing high-strength asphalt cold-patch material according to claim 1 is characterized in that the preparation method of the EAS-GMA comprises the following steps of adding 45-55 parts of polyamide resin into 100-120 parts of dimethylbenzene, stirring and dissolving, dropwise adding 35-45 parts of epoxy resin, adding 0.4-0.6 part of stannous octoate, stirring and reacting in a temperature range of 85-90 ℃ to obtain an epoxy-amide prepolymer, dropwise adding 3-5 parts of KH-570, continuing reacting at 100-110 ℃, and distilling under reduced pressure to obtain the EAS-GMA.
  5. 5. The press-and-solid high-strength asphalt cold-patch material according to claim 4, wherein the stirring and dissolving are carried out at 100-110 ℃, the stirring and dissolving are carried out, the temperature is reduced to 85-90 ℃, the stirring reaction time is 2.5-3.0 h, the continuous reaction time is 1.5-2 h, and the reduced pressure distillation is carried out until all dimethylbenzene is recovered.
  6. 6. The preparation method of the instant-pressing instant-fixing high-strength asphalt cold-patch material is characterized by comprising the steps of premixing isocyanate-terminated polyurethane prepolymer, epoxy resin, benzyl glycidyl ether and DBTDL (55-65): (30-40): (3.1-0.3) in mass ratio under the protection of nitrogen, stirring and reacting to obtain core liquid, adding 1.2-1.8 parts of SDS (sodium dodecyl sulfate) into 200-300 parts of deionized water in mass ratio, stirring and dissolving, adding 30-40 parts of core liquid, emulsifying to obtain emulsion, adding 5-8 parts of MMA and 0.5-1.0 part of KH-570 in a dropwise manner, stirring and adsorbing, adding 0.2-0.4 part of KPS, stirring and reacting at 70-75 ℃ for 3.5-4 hours, cooling to room temperature, centrifuging, collecting precipitate, washing, sieving, vacuum drying, and obtaining the composite modifier.
  7. 7. The press-and-fix high-strength asphalt cold-patch according to claim 6, wherein the core liquid is prepared by stirring and reacting at 60-65 ℃ for 2-2.5 hours.
  8. 8. The press-and-solid high-strength asphalt cold-patch material according to claim 6, wherein the emulsification is performed at 9000 rpm-11000 rpm for 8-12 min to D90 of 150 μm or less, and the stirring adsorption is performed at 50-55 ℃ for 30-60 min.
  9. 9. The press-and-fix high-strength asphalt cold-patch material according to claim 6 is characterized in that the KPS is added after being pre-diluted by 10-12 parts of deionized water, centrifugation is carried out for 10-15 min at 4000-5000 rpm, washing is carried out by deionized water, vacuum drying is carried out for 10-14 h at 45-50 ℃ and-0.07 MPa and-0.08 MPa, and the number of screening screens is 200-250 meshes.
  10. 10. The method for preparing the instant-pressing instant-fixing high-strength asphalt cold-patch material as claimed in claim 1, which is characterized by comprising the following steps: S1, uniformly mixing basalt machine-made sand, limestone chips and KH-550 according to a formula to obtain pre-activated aggregate; S2, heating the road petroleum asphalt to 120-130 ℃ according to a formula, adding EAS-GMA, uniformly mixing, reducing to 70-80 ℃, adding the anionic emulsified asphalt and the epoxidized soybean oil, and uniformly mixing to obtain a composite binder; S3, adding the pre-activated aggregate into a stirrer, stirring at normal temperature, adding the composite binder, stirring, adding the active filler and the lignin fiber, stirring, adding the core-shell structure composite modifier, stirring, and finally adding the coagulant, the anti-aging agent and the anti-loss agent, and stirring uniformly to obtain the asphalt cold-patch material.

Description

High-strength asphalt cold patch material capable of being pressed and fixed and preparation method thereof Technical Field The invention belongs to the technical field of asphalt high polymer materials, and particularly relates to a high-strength asphalt cold patch material capable of being pressed and fixed and a preparation method thereof. Background Asphalt pavement is widely applied to highway and municipal traffic construction due to the advantages of smoothness, wear resistance, comfort in driving and the like, but under the long-term effects of vehicle load and climate environment, diseases such as pits, cracks and the like are easy to generate, if the asphalt pavement is not repaired in time, the pavement is accelerated to be damaged, driving safety is threatened, and the service life of the road is shortened. Traditional pavement repair mainly relies on hot-mix asphalt mixture, although the pavement performance is stable, high-temperature heating is required, construction equipment is complex, the pavement is limited by low-temperature and humid environments, the traffic is delayed, and the rapid emergency repair requirement of dispersible pits is difficult to meet. Therefore, the asphalt cold-patch material is used as a normal-temperature construction material, and the core is that unheated mineral aggregate is mixed with diluted asphalt or modified emulsified asphalt, heating equipment is not needed, construction is simple and convenient, storage is stable, the asphalt cold-patch material can be operated in a wide temperature range of-30 ℃ to 50 ℃ and under a humid condition, and the construction threshold and the environmental influence are greatly reduced. According to a binder forming machine, cold-patch materials are mainly divided into solvent type, emulsion type and reaction type, wherein the solvent type realizes normal-temperature mixing by reducing the viscosity of asphalt through a diluent, the strength is formed by volatilizing the diluent, the emulsion type utilizes the dispersion stability of emulsified asphalt, demulsifies and coagulates after construction, and the reaction type improves the performance through the chemical reaction of additives and the binder. However, the existing cold patch material still has significant technical bottlenecks, such as dependence on volatilization of a diluent in solvent type material strength formation, large environmental influence and easy generation of VOC pollution, and the emulsion type material and the reaction type material have the advantages of improved environmental protection, insufficient initial strength, long curing period and long traffic sealing after compaction. Meanwhile, the traditional cold-patch material has insufficient adhesiveness and durability, is easy to loose and peel after repair, and has weak deformation resistance under heavy traffic. In addition, compactness is difficult to guarantee when small-size compaction equipment works, leads to repairing layer and former road surface to link up poorly, easily causes secondary damage. Therefore, the binder modification technology is required to be continuously optimized, the compatibility of the efficient active additive and asphalt is developed, the novel asphalt cold patch material with the instant pressing and instant fixing characteristics and strong adhesive property is provided, the aims of rapid molding after compaction, standard initial strength and stable long-term performance are fulfilled, and the technical short plate of the current cold patch material in emergency maintenance and heavy-load road section application is made up. Disclosure of Invention Aiming at the problems of long curing time, poor adhesive property, insufficient initial strength, unstable long-term performance and the like of the existing asphalt cold-patch material, the invention provides an instant-pressing instant-fixing high-strength asphalt cold-patch material and a preparation method thereof, and the special process is used for preparing an EAS-GMA (EAS-GMA) and core-shell structure composite modifier, and the special process is used for preparing the cold-patch material by compounding components such as road petroleum asphalt, anionic emulsified asphalt, epoxidized soybean oil, basalt machine-made sand, limestone chips, KH-550, active fillers, lignin fibers and the like according to a specific proportion, and the technical bottlenecks of long curing period, low initial strength, poor adhesive property and insufficient durability of the traditional cold-patch material are broken through multicomponent synergy and process optimization, so that the instant-pressing instant-fixing and high-strength durable unification is realized, and the technical problems of emergency repair of a dispersive pit and maintenance of a heavy-load road are effectively solved. The specific technical scheme is as follows: The cold patch material comprises, by mass, 7-10 parts of road petroleum asphalt, 0.8-1.2 p