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CN-121975342-A - High-viscosity modified asphalt and preparation method thereof

CN121975342ACN 121975342 ACN121975342 ACN 121975342ACN-121975342-A

Abstract

The invention discloses high-viscosity modified asphalt and a preparation method thereof, and belongs to the technical field of asphalt materials, wherein the high-viscosity modified asphalt comprises matrix asphalt, a tackifier, a styrene-butadiene-styrene block copolymer and a stabilizer, the mass ratio of the matrix asphalt to the tackifier to the styrene-butadiene-styrene block copolymer to the stabilizer is 100:2-6:2-6:0.1-1, the tackifier comprises an epoxidation organic compound, a crosslinking agent and an accelerator, and the mass ratio of the epoxidation organic compound to the crosslinking agent to the accelerator is 100:4-20:0.5-3. According to the high-viscosity modified asphalt and the preparation method thereof, the high-temperature performance, construction workability and low-temperature performance of a high-viscosity asphalt system are synergistically optimized through the composite construction of the thermal reversible network and the styrene-butadiene-styrene block copolymer (linear SBS) network, and the technical bottleneck that the three are difficult to consider in the traditional modification technology is broken through.

Inventors

  • LIU FUYONG
  • ZHANG ZHIHENG
  • YU WENWEN
  • HE HONGWEI

Assignees

  • 太原理工大学

Dates

Publication Date
20260505
Application Date
20260323

Claims (10)

  1. 1. The high-viscosity modified asphalt is characterized by comprising matrix asphalt, a tackifier, a styrene-butadiene-styrene block copolymer and a stabilizer, wherein the mass ratio of the matrix asphalt to the tackifier to the styrene-butadiene-styrene block copolymer to the stabilizer is 100:2-6:2-6:0.1-1; the adhesion promoter comprises an epoxidized organic compound, a cross-linking agent and an accelerator, wherein the mass ratio of the epoxidized organic compound to the cross-linking agent to the accelerator is 100:4-20:0.5-3.
  2. 2. The high-viscosity modified asphalt of claim 1, wherein the epoxidized organic compound is at least one of epoxidized natural rubber, polypropylene grafted glycidyl methacrylate, epoxy resin and epoxidized soybean oil, the crosslinking agent is at least one of 4-carboxyphenylboronic acid, 4-carboxyphenylboronic acid pinacol ester and 3-carboxyphenylboronic acid pinacol ester, and the accelerator is at least one of 1, 2-dimethylimidazole, 2,4, 6-tris (dimethylaminomethyl) phenol and triethylamine.
  3. 3. The high viscosity modified asphalt of claim 1, wherein the stabilizer is at least one of sulfur, polyphosphoric acid, diphenyl disulfide, and diphenyl sulfide.
  4. 4. A process for preparing a high viscosity modified asphalt according to any one of claims 1 to 3, comprising the steps of: s1, mixing an epoxidized organic compound, a crosslinking agent and an accelerator, stirring, and reacting to obtain an adhesion promoter; S2, heating and stirring the matrix asphalt, adding the styrene-butadiene-styrene block copolymer and the adhesion promoter obtained in the step S1, raising the temperature, mixing, adding sulfur for reaction, and shearing and swelling and developing after the reaction is completed to obtain the high-viscosity modified asphalt.
  5. 5. The method of claim 4, wherein the stirring speed is 40-80rpm, the stirring temperature is 60-100 ℃, and the stirring time is 10-30min in S1.
  6. 6. The method of claim 4, wherein the reaction temperature is 130-180deg.C and the reaction time is 10-30min in S1.
  7. 7. The method of claim 4, wherein S2, the matrix asphalt is heated to 140-160 ℃, the stirring speed is 480-500rpm, the mixing temperature is 170-190 ℃, the mixing speed is 500-1000rpm, and the mixing time is 30-50min.
  8. 8. The method of claim 4, wherein the reaction time in S2 is 10-20min.
  9. 9. The method of claim 4, wherein the temperature of the shear swelling is 190-210 ℃, the rotational speed of the shear swelling is 3000-5000rpm, and the time of the shear swelling is 30-60min.
  10. 10. The method of claim 4, wherein the temperature of the S2 is 160-190 ℃ and the time of the development is 30-60min.

Description

High-viscosity modified asphalt and preparation method thereof Technical Field The invention relates to the technical field of asphalt materials, in particular to high-viscosity modified asphalt and a preparation method thereof. Background Water permeable asphalt pavement has become an important pavement form in high-temperature and rainy areas by virtue of the high porosity characteristics. Meanwhile, the ultra-thin cover is widely applied as an efficient preventive maintenance technology. Their inherent structural defects can make the pavement less rut resistant and durable. To remedy these deficiencies, high performance, high viscosity modified asphalt must be used as a critical cementing material. The high-viscosity modified asphalt is critical to the performance improvement of asphalt mixtures, and is particularly characterized in that extremely high 60 ℃ dynamic viscosity (generally more than or equal to 20000 Pa.s, and some special requirements are not less than 200000 Pa.s) is required to provide strong inter-aggregate binding force, resist aggregate scattering and high-temperature rutting, meanwhile, proper 135 ℃ rotational viscosity is required to ensure good pumping and mixing performance in construction, and in addition, the high-viscosity modified asphalt also has excellent 5 ℃ ductility to ensure the cracking resistance of pavement under the low-temperature condition. Therefore, developing a high viscosity modified asphalt that can meet these three key performance indicators simultaneously is an urgent need in the art. Disclosure of Invention The invention aims to provide high-viscosity modified asphalt and a preparation method thereof, and the high-temperature performance, construction workability and low-temperature performance of a high-viscosity asphalt system are synergistically optimized through the composite construction of a thermal reversible network and a styrene-butadiene-styrene block copolymer (linear SBS) network, so that the technical bottleneck that the three materials are difficult to consider in the traditional modification technology is broken through. In order to achieve the above purpose, the invention provides a high-viscosity modified asphalt, which comprises matrix asphalt, a tackifier, a styrene-butadiene-styrene block copolymer and a stabilizer, wherein the mass ratio of the matrix asphalt to the tackifier to the styrene-butadiene-styrene block copolymer to the stabilizer is 100:2-6:2-6:0.1-1; the adhesion promoter comprises an epoxidized organic compound, a cross-linking agent and an accelerator, wherein the mass ratio of the epoxidized organic compound to the cross-linking agent to the accelerator is 100:4-20:0.5-3. Preferably, the epoxidized organic compound is at least one of epoxidized natural rubber, polypropylene grafted glycidyl methacrylate, epoxy resin and epoxidized soybean oil, more preferably epoxidized natural rubber, the crosslinking agent is at least one of 4-carboxyphenylboronic acid, 4-carboxyphenylboronic acid pinacol ester and 3-carboxyphenylboronic acid pinacol ester, more preferably 4-carboxyphenylboronic acid pinacol ester, and the accelerator is at least one of 1, 2-dimethylimidazole, 2,4, 6-tris (dimethylaminomethyl) phenol and triethylamine, more preferably 1, 2-dimethylimidazole. Preferably, the stabilizer is at least one of sulfur, polyphosphoric acid, diphenyl disulfide, and diphenyl sulfide, and more preferably sulfur. Preferably, the matrix asphalt is 90# matrix asphalt. The invention also provides a preparation method of the high-viscosity modified asphalt, which comprises the following steps: s1, mixing an epoxidized organic compound, a crosslinking agent and an accelerator, stirring, and reacting to obtain an adhesion promoter; S2, heating and stirring the matrix asphalt, adding the styrene-butadiene-styrene block copolymer and the adhesion promoter obtained in the step S1, raising the temperature, mixing, adding sulfur for reaction, and shearing and swelling and developing after the reaction is completed to obtain the high-viscosity modified asphalt. Preferably, in S1, the stirring speed is 40-80rpm, the stirring temperature is 60-100 ℃, and the stirring time is 10-30min. Preferably, in S1, the reaction temperature is 130-180 ℃ and the reaction time is 10-30min. Preferably, in S2, the matrix asphalt is heated to 140-160 ℃, the stirring speed is 480-500rpm, the mixing temperature is 170-190 ℃, the mixing speed is 500-1000rpm, and the mixing time is 30-50min. Preferably, in S2, the reaction time is 10-20min. Preferably, in S2, the temperature of the shear swelling is 190-210 ℃, the rotating speed of the shear swelling is 3000-5000rpm, and the time of the shear swelling is 30-60min. Preferably, in S2, the development temperature is 160-190 ℃ and the development time is 30-60min. On one hand, the carboxyl of the cross-linking agent and the epoxy group of the epoxy organic compound are utilized to carry out ring-opening reaction to genera