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CN-122011546-A - Asphalt modifier, method for modifying asphalt by utilizing organic montmorillonite to cooperate with waste plastic and nucleating agent, and modified asphalt

CN122011546ACN 122011546 ACN122011546 ACN 122011546ACN-122011546-A

Abstract

The invention discloses a method for modifying asphalt by using an asphalt modifier and montmorillonite in cooperation with waste plastics and a nucleating agent, and modified asphalt, and relates to the technical field of asphalt materials for road engineering. The asphalt modifier is prepared by taking waste plastic, a nucleating agent and organic montmorillonite as raw materials and blending and extruding the raw materials, wherein the main component of the waste plastic is PE, the PE content in the waste plastic is 68.9-78.8%, the weight ratio of the organic montmorillonite to the PE is 1:1.5-2.5, and the weight ratio of the nucleating agent to the PE is 1:2-6. The blending amount of the asphalt modifier in the matrix asphalt is 4-7wt% based on PE. Compared with the softening point before modification, the modified asphalt has the advantages that the storage stability can be greatly improved, because the crystal balls can be better inserted into the organic montmorillonite lamellar structure after PE is nucleated, the storage stability of PE in matrix asphalt is effectively solved, the harmless and recycling utilization of waste plastics can be realized, the cost of the modified asphalt can be reduced, and the environmental and economic benefits are realized.

Inventors

  • LV SONGTAO
  • Liu Duyang
  • XIA CHENGDONG
  • HUANG BIN
  • ZHAO PEIQI
  • Wang Dikuan
  • Dong Peiren
  • YANG YI

Assignees

  • 长沙理工大学
  • 湖南省高速公路集团有限公司

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The asphalt modifier is characterized by being prepared by adopting waste plastics, a nucleating agent and organic montmorillonite as raw materials through blending and extrusion, wherein the main component of the waste plastics is PE, and the PE content in the waste plastics is 68.9-78.8%; The weight ratio of the organic montmorillonite to the PE is 1:1.5-2.5, and the weight ratio of the nucleating agent to the PE is 1:2-6.
  2. 2. The asphalt modifier of claim 1, wherein the asphalt modifier is a modified asphalt, The blending amount of the asphalt modifier in the matrix asphalt is 4-7wt% based on PE.
  3. 3. The asphalt modifier of claim 1, wherein the asphalt modifier is a modified asphalt, The nucleating agent is an organic nucleating agent or an inorganic nucleating agent; The organic nucleating agent is any one of aluminum stearate, calcium stearate and organic phosphate nucleating agent; The inorganic nucleating agent is any one of CaCO 3 , talcum powder and silicon dioxide.
  4. 4. The asphalt modifier of claim 1, wherein the asphalt modifier is prepared by the following steps: (1) Washing and washing the recovered waste plastic to remove surface stains, drying, and then crushing, grinding and screening to obtain waste plastic particles, wherein the particle size of the plastic particles is less than or equal to 5mm; (2) And (3) blending and extruding the waste plastic particles prepared in the step (1) with a nucleating agent and organic montmorillonite according to a preset proportion to prepare the asphalt modifier, wherein the particle size of the asphalt modifier is controlled to be less than or equal to 220 meshes.
  5. 5. The asphalt modifier according to claim 4, wherein the flushing time in (1) is 2-6 hours, and the drying condition is 75-90 ℃ for 2-4 hours.
  6. 6. The method for modifying asphalt by utilizing organic montmorillonite to cooperate with waste plastic and nucleating agent is characterized by comprising the following steps: s1, heating and melting matrix asphalt, and then adding the asphalt modifier of any one of claims 1-5, wherein the temperature is controlled at 160-170 ℃, and the asphalt modifier is stirred while adding to avoid agglomeration, wherein the mixing amount of the asphalt modifier in the matrix asphalt is 4-7wt% based on PE; S2, performing preliminary dispersion stirring at a speed of 200-300 rad/min by using a dispersing instrument; S3, after preliminary dispersion and stirring are finished, controlling the shearing rate to be 4500-5000 r/min, shearing the mixed material at a high speed for 45-60 min, and controlling the temperature to be 170-180 ℃; and S4, carrying out high-speed dispersion stirring at the speed of 300-450 rad/min to obtain the high-speed dispersion stirring.
  7. 7. The method of claim 6, wherein the matrix asphalt is melted in S1 by heating at 140-150 ℃ for 30-35 min.
  8. 8. The method of claim 6, wherein the preliminary dispersion stirring time of S2 is controlled to be 10-15 min.
  9. 9. The method of claim 6, wherein the high-speed dispersion stirring time of S4 is controlled to 15-20 min and the temperature is controlled to 170-185 ℃.
  10. 10. The modified asphalt prepared by the method for modifying asphalt by using organic montmorillonite in cooperation with waste plastics and nucleating agents according to any one of claims 6-9.

Description

Asphalt modifier, method for modifying asphalt by utilizing organic montmorillonite to cooperate with waste plastic and nucleating agent, and modified asphalt Technical Field The invention relates to the technical field of asphalt materials for road engineering, in particular to an asphalt modifier, a method for modifying asphalt by utilizing montmorillonite to cooperate with waste plastics and a nucleating agent, and modified asphalt. Background More than 90% of expressways in China are asphalt pavements. The current asphalt pavement has a design life of 15 years, however, under heavy traffic load and extreme climate conditions, the pavement is easy to suffer from diseases and the like. It is counted that more than 70% of highways need major and minor repairs in about 10 years of service, resulting in a large consumption of resources, which is difficult to sustain. At present, styrene-butadiene-styrene block copolymer (SBS) modified asphalt is the most widely used high-performance asphalt modification means in road engineering. However, in recent years, the market supply of SBS materials with specific brands, which is suitable for asphalt modification, is continuously tense, and is in a state of supply and shortage for a long time, so that the price of the SBS materials is obviously increased, and the production cost of the modified asphalt is greatly increased. On the other hand, with the development of socioeconomic performance and the development of industrial processes, a large number of plastic products are produced and used every year. Although the plastic products bring great convenience to the life of people, the waste plastics are difficult to effectively degrade, and cause serious pressure on natural ecological environment, so that not only are soil and water systems polluted, but also serious waste of resources is caused, and the contradiction between environmental protection and economic development is increasingly aggravated. Meanwhile, the improper recycling treatment of waste plastics also causes serious white pollution. The recovery of plastic products is mainly divided into two main categories, energy recovery and material recovery. The method comprises the steps of (1) an energy recovery process is simple and convenient, heat energy is provided by an incineration mode, a large amount of toxic and harmful gases and particulate matters are generated in the incineration process, and a large amount of carbon dioxide is discharged, and (2) material recovery is divided into physical recovery and chemical recovery, and most of waste plastic products cannot be used for food grade, and the food grade plastic recovery has strict requirements on the appearance and color of the waste plastic, and is generally required to be pure-color waste plastic. The waste plastic products pollute the environment and occupy a large amount of land, and road engineering construction has extremely strong digestion capability on the wastes, so that the waste plastic is converted into high-added-value road materials, the recycling of the waste plastic products is realized, the waste plastic products become a key subject of wide attention in the global scope, and the waste plastic products have great significance on environmental protection and economy. For example, the Chinese patent document CN102337035A provides a scheme for modifying asphalt by using waste plastics, and in particular discloses waste plastic modified asphalt and a preparation method thereof. The waste plastic modified asphalt is prepared from a mixture of matrix asphalt, waste plastic, a compatibility auxiliary agent and inorganic filler, wherein the waste plastic is 4-12 parts by weight, the compatibility auxiliary agent is 2-5 parts by weight, and the inorganic filler is 2-20 parts by weight based on 100 parts by weight of the matrix asphalt. According to the technical scheme, the waste low-density polyethylene (LDPE) is poor in compatibility with matrix asphalt, inorganic matters such as talcum powder and carbon black are added additionally to balance the density of the waste low-density polyethylene and the waste polypropylene and the matrix asphalt, so that the compatibility is improved, but assistants such as talcum powder, carbon black and compatilizer are added additionally, the cost is increased additionally, and the acceptability of physical engineering is low. The Chinese patent document CN119081430A discloses a compatible stable waste plastic recycled asphalt material and a preparation method thereof, and the technical scheme of the compatible stable waste plastic recycled asphalt material relates to the synergistic effect of plastic such as Polyethylene (PE) with specific melt index (10-20 g/10 min) and particle size (200-400 meshes) serving as a modifier, a composite solubilizer such as polyphosphoric acid, dioctyl maleate/aromatic hydrocarbon oil/epoxidized soybean oil and the like and a targeted antioxidant, wherein the composite modi