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CN-121990783-A - Green epoxy resin regenerant and application method thereof in regenerated asphalt

CN121990783ACN 121990783 ACN121990783 ACN 121990783ACN-121990783-A

Abstract

The invention discloses a green epoxy resin regenerant and an application method thereof in regenerated asphalt, wherein the regenerant comprises, by weight, 36-39 parts of plant asphalt, 16-22 parts of base oil, 13-16 parts of organosilicon modified bisphenol A type epoxy resin, 3-4 parts of rosin modified phenolic resin, 5-6.5 parts of hydrothermal modified halloysite nanotubes, 1.5-2.5 parts of nano titanium dioxide, 2.2-2.8 parts of silane coupling agent, 1.3-1.7 parts of trioctyl trimellitate, 1.2-1.5 parts of anti-aging agent and 0.4-0.6 part of catalyst. According to the invention, the nano modification process is updated from simple silane coupling to a 'hydrothermal modification and silane coating' composite process, and the surfactant cetyl trimethyl ammonium bromide is introduced for assisting in dispersion, so that the problem of nano agglomeration in the prior art is solved, the composite nano material has synergistic effect, the ageing resistance and mechanical property are more comprehensively improved compared with a single nano component, the compatibility is better, the performance attenuation caused by excessive agglomeration is avoided, the secondary ageing resistance is obviously improved, and the service life of the regenerated asphalt is prolonged.

Inventors

  • LIU FA
  • MIN ZHAOHUI
  • ZHOU JIN
  • HU JING
  • LUO SANG
  • ZHANG DELONG
  • HOU JUE
  • WANG HOUZHI

Assignees

  • 江苏省交通工程建设局
  • 东南大学

Dates

Publication Date
20260508
Application Date
20251230

Claims (10)

  1. 1. The green epoxy resin regenerant is characterized by comprising, by weight, 36-39 parts of plant asphalt, 16-22 parts of base oil, 13-16 parts of organosilicon modified bisphenol A type epoxy resin, 3-4 parts of rosin modified phenolic resin, 5-6.5 parts of hydrothermal modified halloysite nanotubes, 1.5-2.5 parts of nano titanium dioxide, 2.2-2.8 parts of silane coupling agent, 1.3-1.7 parts of trioctyl trimellitate, 1.2-1.5 parts of anti-aging agent and 0.4-0.6 part of catalyst.
  2. 2. The green epoxy resin regenerant according to claim 1, wherein said vegetable asphalt is bio-based vegetable asphalt having an acid value of 8mgKOH/g or less, and wherein said base oil is 100N base oil having a viscosity of 10mm < 2 >/s or more at 40 ℃.
  3. 3. The green epoxy resin regenerant of claim 1, wherein said organosilicon modified bisphenol A type epoxy resin is prepared by the following steps: Adding bisphenol A epoxy resin into a reaction kettle, heating to 76-78 ℃, adding DBTDL catalyst, dimethoxy silane and deionized water into the bisphenol A epoxy resin material in a mass ratio of 300:10:40:1, stirring for 1h at 300r/min, heating the mixture to 95+/-1 ℃, stirring at constant temperature for 6.5h, sampling and detecting viscosity every 1h, and controlling the viscosity of the product to 1500-2000 mPa.s (25 ℃), thus obtaining the organosilicon modified bisphenol A epoxy resin.
  4. 4. The green epoxy resin regenerant of claim 1, wherein the epoxy value of the organosilicon modified bisphenol A type epoxy resin is set to 0.4-0.5 eq/100g.
  5. 5. The epoxy resin reclaimed asphalt mixture according to claim 1, wherein the hydrothermally modified halloysite nanotubes are prepared from 50-80 nm halloysite nanotubes, and the preparation process is as follows: Placing the halloysite nanotube in a muffle furnace, performing heat treatment at 300-350 ℃ for 1.5 hours, cooling to room temperature for standby, adding deionized water, cetyltrimethylammonium bromide and ethanol into the halloysite nanotube material according to the mass ratio of 50:1000:1:40, mixing the cooled halloysite nanotube with the deionized water, the cetyltrimethylammonium bromide and the ethanol, stirring for 2 hours at 800r/min, adjusting the pH to 4-5 with sulfuric acid, filtering, washing, and drying at 80 ℃ for 24 hours to obtain the hydrothermally modified halloysite nanotube.
  6. 6. The green epoxy resin regenerant according to claim 1, wherein said nano titanium dioxide is 46nm anatase titanium dioxide and said silane coupling agent is KH-560 with purity not less than 98%.
  7. 7. The green epoxy resin regenerant according to claim 1, wherein said anti-aging agent is BHT with a purity of 99% or more and said catalyst is dibutyltin dilaurate with a purity of 96% or more.
  8. 8. The method for preparing a green epoxy resin regenerant according to any one of claims 1 to 7, comprising the steps of: S1, carrying out hydrothermal reaction on a hydrothermal modified halloysite nanotube and tetrabutyl titanate at 120-130 ℃ for 8-9 hours, and carrying out post-treatment to obtain a hydrothermal modified halloysite-titanium dioxide composite powder; S2, compounding the organosilicon modified bisphenol A type epoxy resin and the rosin modified phenolic resin to obtain an epoxy system; and S3, mixing plant asphalt and base oil, heating to 123-127 ℃, sequentially adding the hydrothermal modified halloysite-titanium dioxide composite powder, a silane coupling agent, an epoxy system, trioctyl trimellitate, an anti-aging agent and a catalyst, and cooling and filtering after two-stage shearing and dispersing to obtain an epoxy resin regenerant finished product.
  9. 9. The application method of the green epoxy resin regenerant in regenerating asphalt is characterized by comprising the following steps: S1, mixing epoxy resin, a regenerant and an anti-aging agent, heating to 90-110 ℃, stirring and reacting for 3-6 hours to obtain a first mixed component, heating to 80-100 ℃, and preserving heat and storing; S2, mixing the curing agent, the softening agent and the accelerator, heating to 70-90 ℃, stirring and reacting for 3-6 hours to obtain a second mixed component, heating to 60-80 ℃, and preserving heat and storing; s3, mixing the first mixed component and the second mixed component, adding an accelerator into the mixture, and uniformly stirring to obtain a treatment additive; S4, heating aggregate to 180-220 ℃, adding RAP, and stirring for 5-10 seconds; S2, adding asphalt into the aggregate, and stirring the asphalt and the aggregate to uniformly mix the asphalt and the aggregate; and S3, adding the treatment additive into a mixing cylinder, combining with the mixture of asphalt materials and aggregate, stirring and mixing for 30-80 seconds, and discharging.
  10. 10. The method for using the green epoxy resin regenerant to regenerate asphalt according to claim 9, wherein the treating additive comprises the following components in parts by weight: 30-80 parts of epoxy resin; 40-80 parts of curing agent; 3-10 parts of softener; 5-15 parts of a regenerant; 1-3 parts of an anti-aging agent; 1-5 parts of a promoter; And the treatment additive amount is set to 8-15% of the total weight of the asphalt, the asphalt amount is set to 4-5% of the total weight of the aggregate, and the RAP amount is set to 30-70% of the total weight of the aggregate.

Description

Green epoxy resin regenerant and application method thereof in regenerated asphalt Technical Field The invention relates to the technical field of road engineering materials, in particular to a green epoxy resin regenerant and an application method thereof in regenerated asphalt. Background After long-term use, asphalt pavement can be aged gradually under the action of heat, oxygen and pressure, and diseases such as pavement cracks, looseness and the like appear, so that maintenance measures are needed for old asphalt pavement in order to restore pavement performance and maintain a certain road service level. In the old road reconstruction, the asphalt recycling technology can effectively utilize the waste pavement materials, reduce the production cost, improve the efficiency, is beneficial to environmental protection and emission reduction, has obvious economic and social benefits, and is increasingly widely applied in engineering. Along with the continuous increase of road maintenance and reconstruction engineering, a large amount of waste asphalt mixture (RAP) needs to be recycled. Conventional reclaimed asphalt mixtures typically recover the performance of RAP by adding a regenerant and a softener, but their road performance (such as high temperature stability, fatigue resistance, and durability) tends to be lower than new ones. The epoxy resin modified asphalt is a high-performance material, and can obviously improve the strength and the service life of asphalt mixture. However, when the epoxy resin is applied to the reclaimed asphalt mixture, the problems of insufficient dispersivity of a single nano material in the epoxy resin reclaiming agent, limited compatibility of the epoxy resin and asphalt, weak secondary aging resistance and environmental protection hidden trouble of partial formula dependence on waste engine oil exist. Therefore, there is a need to develop a green epoxy resin regenerant and a method of using the same in regenerating asphalt to solve the above problems. Disclosure of Invention Aiming at the problems, the invention aims to provide a green epoxy resin regenerant and an application method thereof in regenerated asphalt, which solve the problems of insufficient dispersibility of a single nano material, limited compatibility of epoxy resin and asphalt, weak secondary aging resistance and hidden danger of environmental protection due to the fact that part of formula depends on used engine oil. In order to achieve the above object, the present invention provides the following technical solutions: the green epoxy resin regenerant comprises, by weight, 36-39 parts of plant asphalt, 16-22 parts of base oil, 13-16 parts of organic silicon modified bisphenol A epoxy resin, 3-4 parts of rosin modified phenolic resin, 5-6.5 parts of hydrothermal modified halloysite nanotubes, 1.5-2.5 parts of nano titanium dioxide, 2.2-2.8 parts of silane coupling agent, 1.3-1.7 parts of trioctyl trimellitate, 1.2-1.5 parts of anti-aging agent and 0.4-0.6 part of catalyst. Preferably, in the technical scheme, the plant asphalt adopts bio-based plant asphalt, the acid value of the bio-based plant asphalt is less than or equal to 8mgKOH/g, the base oil adopts 100N base oil, and the viscosity of the 100N base oil is more than or equal to 10mm < 2 >/s at 40 ℃. Preferably, in the above technical scheme, the preparation process of the organosilicon modified bisphenol a epoxy resin is as follows: Adding bisphenol A epoxy resin into a reaction kettle, heating to 76-78 ℃, adding DBTDL catalyst, dimethoxy silane and deionized water into the bisphenol A epoxy resin material in a mass ratio of 300:10:40:1, stirring for 1h at 300r/min, heating the mixture to 95+/-1 ℃, stirring at constant temperature for 6.5h, sampling and detecting viscosity every 1h, and controlling the viscosity of the product to 1500-2000 mPa.s (25 ℃), thus obtaining the organosilicon modified bisphenol A epoxy resin. Preferably, in the above technical scheme, the epoxy value of the organosilicon modified bisphenol a type epoxy resin is set to 0.4-0.5 eq/100g. Preferably, in the above technical scheme, the hydrothermally modified halloysite nanotube is prepared from a halloysite nanotube with a pipe diameter of 50-80 nm, and the preparation process is as follows: Placing the halloysite nanotube in a muffle furnace, performing heat treatment at 300-350 ℃ for 1.5 hours, cooling to room temperature for standby, adding deionized water, cetyltrimethylammonium bromide and ethanol into the halloysite nanotube material according to the mass ratio of 50:1000:1:40, mixing the cooled halloysite nanotube with the deionized water, the cetyltrimethylammonium bromide and the ethanol, stirring for 2 hours at 800r/min, adjusting the pH to 4-5 with sulfuric acid, filtering, washing, and drying at 80 ℃ for 24 hours to obtain the hydrothermally modified halloysite nanotube. Preferably, in the technical scheme, the nano titanium dioxide adopts 46nm anatase titanium dio