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CN-121975343-A - Composite material with reclaimed asphalt and virgin asphalt synergistically modified and preparation method thereof

CN121975343ACN 121975343 ACN121975343 ACN 121975343ACN-121975343-A

Abstract

The invention provides a composite material with synergic modification of regenerated asphalt and primary asphalt and a preparation method thereof, belonging to the technical field of compositions of high molecular compounds, wherein the asphalt composite material comprises primary No. 70 asphalt, primary No. 90 asphalt, recycled asphalt, an asphaltene dispersion-elastomer network reinforcing agent, a polyester-rubber interpenetrating network grafted amino polyether polyol regeneration synergist, a warm mix agent, a composite silane coupling agent, a crosslinking stabilizer, an anti-aging agent and the like. The asphaltene dispersion-elastomer network reinforcing agent is prepared by mixing terpene resin, adding maleic anhydride grafted SBS, mixing, adding a coupling agent KH-590 and an antioxidant 1010, mixing, adding brominated butyl rubber and zinc oxide, and carrying out melt extrusion. The polyester-rubber interpenetrating network grafted amino polyether polyol regeneration synergist is prepared by adding polyether polyol N210 after the reaction of PET alcoholysis oligomer and maleic anhydride grafted butyl rubber solution.

Inventors

  • GE JUN
  • LIANG WEI
  • YAO SHUXIN

Assignees

  • 沈阳道庆沥青混凝土有限公司

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. The composite material is characterized by comprising, by mass, 20-25 parts of primary 70 # asphalt, 10-15 parts of primary 90 # asphalt, 20-25 parts of recycled asphalt, 5-7 parts of asphaltene dispersion-elastomer network reinforcing agent, 3-5 parts of polyester-rubber interpenetrating network grafted aminopolyether polyol regeneration synergist, 2.5-4.5 parts of warm mix agent, 1-1.5 parts of composite silane coupling agent, 0.3-0.5 part of crosslinking stabilizer and 0.3-0.5 part of anti-aging agent; The asphalt dispersion-elastomer network reinforcing agent is prepared by mixing terpene resin, adding maleic anhydride grafted SBS, mixing, adding a coupling agent KH-590 and an antioxidant 1010, mixing, adding brominated butyl rubber and zinc oxide, and carrying out melt extrusion, wherein the mass ratio of the terpene resin to the maleic anhydride grafted SBS to the brominated butyl rubber to the coupling agent KH-590 to the antioxidant 1010 to the zinc oxide is (40-45) (30-35) (0.5-0.8) (0.2-0.3) (0.8-1); The polyester-rubber interpenetrating network grafted amino polyether polyol regeneration synergist is prepared by carrying out an alcoholysis reaction on a polyethylene terephthalate, diethylene glycol and zinc acetate according to the mass ratio of (65-70): (30-35) and a maleic anhydride grafted butyl rubber solution according to the mass ratio of (22-28): (3.5-4.5): (0.4-0.6) in dimethylbenzene with the mass ratio of 4-5 times of that of butyl rubber and carrying out a reaction on the mixture of (0.5-0.6) in 100 ℃ in dimethylbenzene with the mass ratio of (40-48): (18-22): (0.2-0.3) and (190 ℃) in a polyester-rubber interpenetrating network grafted amino polyether polyol regeneration synergist.
  2. 2. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 1 is characterized in that the preparation method of the asphaltene dispersion-elastomer network reinforcing agent comprises the steps of mixing terpene resin, adding maleic anhydride for grafting SBS, adding brominated butyl rubber and zinc oxide, mixing and vulcanizing reaction, melt extrusion, water cooling and granulating according to the mass ratio of terpene resin, maleic anhydride for grafting SBS, coupling agent KH-590, antioxidant 1010 and zinc oxide= (40-45), 30-35, 0.5-0.8, 0.2-0.3 and 0.8-1.
  3. 3. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 2 is characterized in that terpene resin is mixed for 3-5 min at 110-115 ℃ and 35-40 rpm, the maleic anhydride grafted SBS is added in three equal parts every 2-3 min, the temperature is raised to 120-125 ℃ after the maleic anhydride grafted SBS is added, the rotation speed is adjusted to 40-45 rpm, the mixing is carried out for 6-8 min, and the coupling agent KH-590 and the antioxidant 1010 are mixed for 3-5 min after the maleic anhydride grafted SBS is added.
  4. 4. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 2 is characterized in that the mixing and vulcanizing reaction is carried out for 18-22 min at 150-155 ℃ and 40-45 rpm, the melt extrusion is carried out by a twin screw extruder at 145-155 ℃, and the asphaltene dispersion-elastomer network reinforcing agent is cylindrical particles with the diameter of 2-3 mm and the length of 3-5 mm.
  5. 5. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 1 is characterized in that the preparation method of the polyester-rubber interpenetrating network grafted aminopolyether polyol reclaimed synergist comprises the steps of diluting the PET alcoholysis oligomer with dimethylbenzene according to the mass ratio of (65-70) of the PET alcoholysis oligomer to the maleic anhydride grafted butyl rubber solution, dropwise adding the PET alcoholysis oligomer into the maleic anhydride grafted butyl rubber solution, stirring and reacting at 120-130 ℃ to obtain a polyester-rubber interpenetrating network prepolymer solution, adding polyether polyol N210 accounting for 35-40% of the mass of the PET alcoholysis oligomer, stirring and reacting at 140-150 ℃ to obtain a reaction solution, distilling under reduced pressure to obtain a concentrated solution, adding methanol for precipitation, filtering, washing a filter cake, centrifuging, taking solids, and vacuum drying and crushing to obtain the polyester-rubber interpenetrating network grafted aminopolyether polyol reclaimed synergist.
  6. 6. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 5 is characterized in that the dilution amount of the dimethylbenzene is 1.2-1.5 times the mass of the PET alcoholysis oligomer, the reduced pressure distillation is carried out until the dimethylbenzene accounting for 85-90 wt% is recovered, the addition amount of the methanol is 3-5 times the mass of the concentrated solution, the filter cake is washed 2-3 times by deionized water, the centrifugation is 600-6500 rpm for 15-20 min, the crushing and sieving are carried out, and the granularity between 120-325 meshes is obtained.
  7. 7. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 5 is characterized in that the preparation method of the PET alcoholysis oligomer comprises the steps of stirring and alcoholysis of polyethylene terephthalate, diethylene glycol and zinc acetate (40-48): (18-22): (0.2-0.3) at 190-200 ℃ under the protection of nitrogen, and cooling to 70-80 ℃ to obtain the PET alcoholysis oligomer.
  8. 8. The composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 5 is characterized in that the preparation method of the maleic anhydride grafted butyl rubber solution comprises the steps of dissolving butyl rubber in xylene with the mass ratio of 4-5 times to 5 times according to the mass ratio of (22-28) of (3.5-4.5) to (0.4-0.6) of butyl rubber, maleic anhydride and dibenzoyl peroxide under the protection of nitrogen, stirring and dissolving at 100-110 ℃, adding maleic anhydride and dibenzoyl peroxide, and stirring and reacting to obtain the maleic anhydride grafted butyl rubber solution.
  9. 9. The composite material for the synergistic modification of the reclaimed asphalt and the virgin asphalt according to claim 1 is characterized in that the warm mix agent is composed of naphthenic oil, fatty acid amide, styrene tackifier, polyoxyethylene castor oil and tributyl citrate according to the mass ratio of (3-4): 2-2.5): 4-5: (1-1.5), the composite silane coupling agent is composed of coupling agent KH-590 and coupling agent KH-550 according to the mass ratio of (1-1.5): 1, the crosslinking stabilizer is polyphosphoric acid, and the anti-aging agent is composed of antioxidant 1076 and pentaerythritol phosphate according to the mass ratio of (1.5-2): 1.
  10. 10. The method for preparing the composite material with the synergistic modification of the reclaimed asphalt and the virgin asphalt as claimed in claim 1, which is characterized by comprising the following steps: According to the formula, the recycled asphalt is heated to 155-160 ℃ according to the parts by weight, a composite silane coupling agent, an asphaltene dispersion-elastomer network reinforcing agent and a polyester-rubber interpenetrating network grafted amino polyether polyol regeneration synergist are sequentially added under stirring, the recycled asphalt is obtained by mixing, and the primary No. 70 asphalt, the primary No. 90 asphalt, the warm mix agent, the crosslinking stabilizer and the anti-aging agent are sequentially added, and are mixed until uniform and fine, so that the composite material is obtained.

Description

Composite material with reclaimed asphalt and virgin asphalt synergistically modified and preparation method thereof Technical Field The invention belongs to the technical field of asphalt compositions, and particularly relates to a composite material with synergistically modified reclaimed asphalt and virgin asphalt and a preparation method thereof. Background Asphalt is used as a core cementing material for road construction, is widely applied to urban roads and highway engineering, and becomes a key material for traffic infrastructure construction by virtue of good cohesiveness, plasticity and deformation resistance. Under the dual driving of green low carbon and traffic demand, the problems of resource dependence and solid waste pollution of the traditional asphalt materials are increasingly highlighted, and the regenerated asphalt technology is generated and becomes a key path for industry transformation. The prior primary asphalt is mainly refined from petroleum distillation residues, the core component is hydrocarbon and derivatives thereof, SBS (styrene-butadiene-styrene block copolymer), rubber and other modifiers are used for optimizing performance, and road performance focuses on high-temperature stability, low-temperature crack resistance and water stability, so that the use requirements of conventional roads can be met. However, the production of the primary asphalt depends on non-renewable petroleum resources, and the comprehensive performance of a single modification system under extreme environments is difficult to consider, so that the problems of rutting, cracking and the like are easy to occur in heavy traffic and areas with larger temperature difference. The recycling asphalt technology realizes resource recycling by recycling asphalt of old asphalt pavement and doping regenerant materials. In the prior art, blending of regenerated asphalt is tried, but the core bottleneck is still faced, the performance of the regenerated mixture after blending with a high proportion of more than 20% is inferior to that of common raw asphalt, and the regenerated mixture is mainly characterized in that the asphalt is degraded due to secondary aging, the high-low temperature performance is unbalanced, and the water stability is insufficient. The key performance problems of the current regenerated asphalt are prominent, namely, the old asphalt is poor in compatibility with new aggregates and new asphalt after aging, so that the strength of the mixture is reduced, the durability is reduced, rutting is easily caused due to insufficient high-temperature stability when the mixture is mixed in a high proportion, shrinkage cracks are easily generated due to weak low-temperature cracking resistance, and water stability is poor, and peeling and loosening diseases are easily generated after freeze thawing circulation. In addition, the long-term service stability of the regenerated mixture is still different from that of the original asphalt material, and the severe requirements of high-grade roads are difficult to meet. In view of the above, there is a need to develop a composite material in which reclaimed asphalt and virgin asphalt are synergistically modified. The stability of the primary asphalt is complementary with the resource advantage of the reclaimed asphalt, and the ingredient compatibility is optimized by combining the synergistic modification technology, so that the bottleneck of the influence of the blending proportion of the existing reclaimed asphalt on the performance can be broken through, the utilization rate of the reclaimed asphalt is improved, the comprehensive improvement of the comprehensive road performance is realized, and the good recycling utilization is realized. Disclosure of Invention In order to improve the component compatibility of the reclaimed asphalt and the primary asphalt, the utilization rate of the reclaimed asphalt is improved, and meanwhile, various service performances are broken through, so that the good use requirements are met. According to the composite material with the synergic modification of the reclaimed asphalt and the virgin asphalt and the preparation method thereof, the reclaimed asphalt is subjected to performance optimization by preparing an asphaltene dispersion-elastomer network reinforcing agent and a polyester-rubber interpenetrating network grafted aminopolyether polyol reclaimed synergist and matching with components such as a warm mix agent and a composite silane coupling agent, physical support is provided, chemical restoration and compatibility are realized, high-value utilization of solid waste is realized, the compatibility of new asphalt and old asphalt is improved, and the problems of adhesive force reduction, high-low temperature unbalance, insufficient stability and the like caused by high-proportion recycling are solved. The specific technical scheme is as follows: The composite material comprises, by mass, 20-25 parts of primary 70 # asphal