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CN-121975082-A - High-performance asphalt modifier, preparation method of high-performance asphalt and asphalt mixture

CN121975082ACN 121975082 ACN121975082 ACN 121975082ACN-121975082-A

Abstract

The application relates to the technical field of new road materials, in particular to a high-performance asphalt modifier, a preparation method of high-performance asphalt and an asphalt mixture, wherein the raw materials of the modifier are composed of isocyanate compounds, amino-terminated polyolefin and hydroxyl-terminated polyolefin; the modifier of the application realizes reinforcing and toughening of asphalt through physical and chemical cooperation by virtue of an ureido/carbamate interpenetrating network structure formed by isocyanate and amino/hydroxyl, the swelling action of amino-terminated polyolefin and hydroxyl-terminated polyolefin in asphalt and the strong hydrogen bonding action of a system. Under the condition of lower mixing amount, the prepared modified asphalt and the mixture have the characteristics of high modulus and fatigue resistance.

Inventors

  • CHENG JINLIANG
  • MA RENSHUAI
  • LIU ZIYANG
  • ZHOU QI
  • HONG JINXIANG
  • GONG MINGHUI
  • XIONG ZIJIA
  • XU ZHENGHONG
  • JIANG LEI
  • WANG JIAJUN
  • DENG CHENG
  • ZHU XIAOBIN

Assignees

  • 江苏苏博特新材料股份有限公司
  • 镇江苏博特新材料有限公司
  • 江苏博路交通科技有限公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (10)

  1. 1. A high-performance asphalt modifier is characterized in that raw materials comprise isocyanate compounds, amino-terminated polyolefin and hydroxyl-terminated polyolefin, wherein the isocyanate compounds comprise polymethylene polyphenyl isocyanate and isophorone diisocyanate, and the hydroxyl-terminated polyolefin and isophorone diisocyanate react in advance to obtain an isocyanate-terminated polyurethane prepolymer; The ratio of the sum of the moles of isocyanate groups in the polymethylene polyphenyl isocyanate and the isocyanate-terminated polyurethane prepolymer to the sum of the moles of the active groups in the asphalt and the total number of amine groups in the amino-terminated polyolefin is (0.7-1.1).
  2. 2. The high-performance asphalt modifier of claim 1, wherein the residual isocyanate content of the isocyanate-terminated polyurethane prepolymer is 5-10%.
  3. 3. The high-performance asphalt modifier according to claim 2, wherein the mass ratio of the sum of the polymethylene polyphenyl isocyanate and the amino-terminated polyolefin to the polyurethane prepolymer of the isocyanate terminated polyurethane is (3:7) - (7:3), the hydroxyl-terminated polyolefin accounts for 65-80% of the mass of the polyurethane prepolymer of the isocyanate terminated polyurethane, and the amino-terminated polyolefin accounts for more than 40% of the sum of the masses of the amino-terminated polyolefin and the polymethylene polyphenyl isocyanate.
  4. 4. A high performance asphalt modifier according to claim 3, wherein the amino terminated polyolefin comprises an amino terminated nitrile rubber.
  5. 5. The high-performance asphalt modifier of claim 4, wherein the acrylonitrile content of the amino-terminated nitrile rubber is 10-22%.
  6. 6. A high performance asphalt modifier according to claim 1, wherein the hydroxy polyolefin comprises hydroxy terminated polybutadiene.
  7. 7. A method for preparing high performance asphalt using the high performance asphalt modifier of any one of claims 1 to 6, comprising the steps of: S1, heating and stirring hydroxyl-terminated polyolefin in an oil bath pot at 100-130 ℃, vacuumizing and removing water, and then dropping isophorone diisocyanate to react for 1-3 hours after the temperature is reduced to 70-100 ℃ to prepare an isocyanate-terminated polyurethane prepolymer; S2, heating the matrix asphalt to 120-160 ℃, and then adding the calculated amount of amino-terminated polyolefin and stirring for 0.2-1 h; and S3, simultaneously adding calculated amount of polymethylene polyphenyl isocyanate and polyurethane prepolymer of terminal isocyanate into the S2, and stirring and reacting for 0.5-6 hours in the asphalt at 140-160 ℃ to prepare the high-performance modified asphalt.
  8. 8. The method for preparing high-performance asphalt of the high-performance asphalt modifier according to claim 7, wherein the total blending amount of each component of the high-performance asphalt modifier accounts for 2.5-7% of the mass of the matrix asphalt.
  9. 9. An asphalt mixture for use with the high-performance asphalt of claim 7 or 8, wherein the raw materials comprise high-performance asphalt, aggregate and mineral powder.
  10. 10. The asphalt mixture according to claim 9, wherein the preparation method of the asphalt mixture comprises the steps of adding high-performance modified asphalt heated to 155-165 ℃ into aggregate at 170-185 ℃ for mixing, adding mineral powder for mixing to obtain the asphalt mixture, and preparing the asphalt mixture, wherein the discharge temperature of the prepared asphalt mixture is 170-180 ℃, and the forming temperature is 160-170 ℃.

Description

High-performance asphalt modifier, preparation method of high-performance asphalt and asphalt mixture Technical Field The application relates to the technical field of new road materials, in particular to a high-performance asphalt modifier, a preparation method of high-performance asphalt and an asphalt mixture. Background The current high modulus pavement technology mainly adopts a mode of high modulus asphalt or high modulus additive. The high modulus asphalt mainly adopts a mode of compounding matrix asphalt and low-grade asphalt, and the mixing amount of the low-grade asphalt is higher (20% and above). The high modulus agent (accounting for 0.5-1.2 percent of the mixture) is generally a direct-injection additive prepared from components such as polyolefin materials, hard asphalt and the like. The two high-modulus pavement technologies can improve the dynamic modulus of the mixture and the pavement load to a certain extent, but the mixture prepared in the application process has the problems of easy fatigue cracking, local loosening of the pavement and the like. Then, researchers prepare the high-modulus anti-fatigue asphalt mixture by optimizing the mixing proportion of the high-modulus mixture (increasing the consumption of asphalt cement and reducing the void ratio), and improve the fatigue performance to a certain extent on the basis of considering the high-modulus characteristic of the mixture. The conventional high-modulus anti-fatigue pavement technical scheme generally has the problems of larger mixing amount of the modifier, high pavement molding and compacting requirements, limited performance improvement and the like, and needs to continuously develop novel high-modulus anti-fatigue pavement technical research. As a chemical modified asphalt, the polyurethane modified asphalt is proved to be capable of improving the high-low temperature performance of matrix asphalt, prolonging the fatigue resistance, increasing the complex modulus and ageing resistance of asphalt and the like, so that the polyurethane modified asphalt is widely paid attention to researchers. The polyurethane modified asphalt is prepared by chemical and physical reaction of isocyanate active groups and hydroxyl, amino, carboxyl and other active groups or added active groups in the asphalt. Because the polyurethane system has strong design flexibility, polyurethane prepolymers, elastomers and the like can be prepared by designing polyurethanes with different molecular structures (such as optimizing the proportion of soft and hard segments and regulating and controlling the content of residual isocyanate). The compatibility/dispersibility of polyurethane and asphalt components is a precondition for realizing modification, so that different modification effects on asphalt are achieved. The preparation method of the polyurethane modified asphalt comprises a one-step method, a prepolymer method and an elastomer method, and the modification principles and technical effects of different preparation methods are different. The mixing amount of the polyurethane modifier component in the polyurethane modified asphalt is generally larger in range and is about 3-60% of the asphalt. CN102464892a discloses a composite polyurethane modifier for road asphalt, the mixing amount of the modifier is 3-40% of that of matrix asphalt, and the modified asphalt prepared by 5% of the mixing amount of the modifier can achieve a modification effect similar to that of SBS asphalt, but the research on the high modulus and fatigue resistance of the modified asphalt is not involved. CN116144165B discloses a recoverable, repairable thermosetting polyurethane modified asphalt material and a preparation method thereof, wherein the mixing amount of the modifier is higher, and the ratio of polyurethane prepolymer to asphalt is 7:3-3:7. Therefore, the problems of high modifier content, limited improvement of high modulus fatigue resistance and the like commonly existing in the existing high modulus asphalt pavement technology are solved. Disclosure of Invention The application provides a high-performance asphalt modifier, a preparation method of high-performance asphalt and an asphalt mixture. The modifier disclosed by the application realizes reinforcing and toughening of asphalt through physical-chemical synergistic effect by virtue of an ureido/carbamate interpenetrating network structure formed by isocyanate and amino/hydroxyl, the swelling effect of amino-terminated polyolefin and hydroxyl-terminated polyolefin in asphalt and the strong hydrogen bonding effect of a system, and further the prepared modified asphalt and mixture have the characteristics of high modulus and fatigue resistance under the condition of lower mixing amount. In a first aspect, the application provides a high-performance asphalt modifier, which adopts the following technical scheme: the high-performance asphalt modifier is prepared from an isocyanate compound, amino-terminated polyolefi