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CN-121975340-A - Illegal cooking oil-based modified biological asphalt material and preparation method thereof

CN121975340ACN 121975340 ACN121975340 ACN 121975340ACN-121975340-A

Abstract

The invention discloses a illegal cooking oil-based modified biological asphalt material and a preparation method thereof, belonging to the technical field of road engineering building materials and waste recycling. The raw materials of the illegal cooking oil-based modified biological asphalt material comprise, by mass, 100 parts of matrix asphalt, 10 to 20 parts of pretreated illegal cooking oil, 3 to 8 parts of micromolecular modified ethylene-vinyl acetate copolymer, 0.5 to 2.0 parts of compatibilizer, 0.1 to 0.5 part of crosslinking stabilizer, 0.1 to 1.0 part of anti-aging agent and 4 to 8 parts of active mineral powder filler. The invention utilizes a specific micromolecular modifier to endow the ethylene-vinyl acetate copolymer with a unique amphiphilic structure, wherein a long-chain structure improves the solubility and dispersibility of the polymer in a swill-cooked dirty oil phase according to a similar compatibility principle, and an introduced thiophene ring structure enhances the interfacial binding force with asphaltene and aromatic components through conjugation and polar adsorption.

Inventors

  • LI WANXIN

Assignees

  • 广州正和化工有限公司

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. A illegal cooking oil-based modified biological asphalt material is characterized by comprising the following raw materials, by mass, 100 parts of matrix asphalt, 10 to 20 parts of pretreated illegal cooking oil, 3 to 8 parts of small molecule modified ethylene-vinyl acetate copolymer, 0.5 to 2.0 parts of compatibilizer, 0.1 to 0.5 parts of crosslinking stabilizer, 0.1 to 1.0 parts of anti-aging agent and 4 to 8 parts of active mineral powder filler; the small molecule modified ethylene-vinyl acetate copolymer is prepared by grafting reaction of ethylene-vinyl acetate copolymer resin and a small molecule modifier 1,2, 3-glycerol tri (10-hydroxy-11- ((2- (thiophene-3-yl methyl) acryloyl) oxy) eicosanoate); the structure of the 1,2, 3-glycerol tri (10-hydroxy-11- ((2- (thiophene-3-yl methyl) acryloyl) oxy) eicosanoate) is as follows: 。
  2. 2. the illegal cooking oil-based modified biological asphalt material according to claim 1, wherein the base asphalt is one or more selected from the group consisting of 70 # road petroleum asphalt and 90 # road petroleum asphalt; the pretreated swill-cooked dirty oil has a free fatty acid content of less than 7%, a moisture content and an insoluble impurity content of less than 1%, an iodine value of greater than 80 grams of iodine per 100 grams, and a sulfur content of less than 55 milligrams per kilogram.
  3. 3. The illegal cooking oil-based modified biological asphalt material according to claim 1, wherein the compatibilizer is one or more selected from the group consisting of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and epoxy resin; the crosslinking stabilizer is one or more selected from sulfur powder, tetramethylthiuram disulfide and zinc dibutyl dithiocarbamate.
  4. 4. The illegal cooking oil-based modified biological asphalt material according to claim 1, wherein the anti-aging agent is selected from one or more of 2, 6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris (2, 4-di-tert-butylphenyl) phosphite; the active mineral powder filler is selected from one or more of ground limestone powder, diatomite and fly ash, and the fineness of the active mineral powder filler is sieved by a 200-mesh sieve.
  5. 5. A method of preparing a illegal cooking oil-based modified biological asphalt material according to any one of claims 1 to 4, comprising the steps of: Firstly, preparing a micromolecular modified ethylene-vinyl acetate copolymer, namely mixing ethylene-vinyl acetate copolymer resin, a micromolecular modifier 1,2, 3-glycerol tri (10-hydroxy-11- ((2- (thiophene-3-yl methyl) acryloyloxy) eicosanoate) and a free radical initiator, and then sending the mixture into a double-screw extruder for reaction extrusion, and performing devolatilization, extrusion, cooling and granulating to obtain the micromolecular modified ethylene-vinyl acetate copolymer; secondly, preparing a swill-cooked dirty oil and asphalt mixed base material, namely heating base asphalt to be in a molten flow state, adding pretreated swill-cooked dirty oil, and stirring to uniformly mix the swill-cooked dirty oil and the base asphalt to obtain a swill-cooked dirty oil modified asphalt base material; And thirdly, shearing modification and swelling development, namely heating the illegal cooking oil modified asphalt base material, adding the micromolecular modified ethylene-vinyl acetate copolymer and the compatibilizer, shearing and dispersing by using a shearing machine, and then adding the crosslinking stabilizer, the anti-aging agent and the active mineral powder filler for heat preservation development to obtain the illegal cooking oil modified biological asphalt material.
  6. 6. The method for producing a illegal cooking oil-based modified bio-asphalt material according to claim 5, wherein in the first step, the ethylene-vinyl acetate copolymer resin has a vinyl acetate mass fraction of 5% to 40% and a melt index of 0.3 to 50 g per 10 minutes at 190 ℃ under a load of 2.16 kg; the ethylene-vinyl acetate copolymer resin is dried at 40 to 80 ℃ for 2 to 8 hours until the water content is not more than 0.10 percent before use.
  7. 7. The method for producing a illegal cooking oil-based modified biological asphalt material according to claim 5, wherein in the first step, the small molecule modifier is added in an amount of 0.1 to 10 parts by mass and the radical initiator is added in an amount of 0.01 to 1.0 parts by mass based on 100 parts by mass of the ethylene-vinyl acetate copolymer resin; the free radical initiator is selected from one or more of di-tert-butyl peroxide, benzoyl peroxide and dicumyl peroxide.
  8. 8. The method for producing a illegal cooking oil-based modified bio-asphalt material according to claim 5, wherein in the first step, the barrel temperature of the twin-screw extruder is set to 120 to 200 ℃, the screw rotation speed is 50 to 600 revolutions per minute, the residence time of the material in the reaction section is 1 to 10 minutes, the devolatilization is performed in the latter section of the extruder at a vacuum of 50 to 5000 pascals, and 0.01 to 0.5 parts by mass of a radical terminator is added.
  9. 9. The method for producing a illegal cooking oil-based modified bio-asphalt material according to claim 5, wherein in the second step, the base asphalt is heated to 130 to 150 ℃ at a stirring speed of 300 to 500 revolutions per minute for 20 to 40 minutes.
  10. 10. The method for producing a swill-cooked dirty oil-based modified bio-asphalt material according to claim 5, wherein in the third step, the temperature of the swill-cooked dirty oil-based modified asphalt base material is raised to 170 to 180 ℃, the rotation speed of a shearing machine is 3000 to 5000 revolutions per minute, the shearing dispersion time is 45 to 60 minutes, the stirring speed during the development of heat preservation is 500 to 800 revolutions per minute, the temperature is 160 to 170 ℃, and the development time of heat preservation is 2 to 4 hours.

Description

Illegal cooking oil-based modified biological asphalt material and preparation method thereof Technical Field The invention belongs to the technical field of road engineering building materials and waste recycling, and particularly relates to a illegal cooking oil-based modified biological asphalt material and a preparation method thereof. Background With the rapid development of road traffic infrastructure construction, asphalt pavements are used as main paving forms, and the demand of raw material matrix asphalt is increasing. However, matrix asphalt mainly originates from petroleum refining, belongs to non-renewable resources, and faces the dual pressures of resource exhaustion and price fluctuation. Meanwhile, a large amount of kitchen waste grease, commonly called swill-cooked dirty oil, is generated in social life. If the illegal cooking oil is improperly treated, serious pollution to water and soil can be caused, and even food safety can be endangered by the backflow of the dining table. The pretreated swill-cooked dirty oil is used as biomass raw material to replace or modify matrix asphalt to prepare biological asphalt, so that the recycling of waste grease can be realized, the problem of environmental pollution is solved, the material cost of asphalt pavement can be effectively reduced, and the development trend of green traffic and recycling economy is met. However, swill-cooked dirty oil has a relatively small molecular weight and contains triglycerides and fatty acids as main components. The asphalt is directly mixed into matrix asphalt, and although the low-temperature cracking resistance and construction workability of the asphalt can be improved, the asphalt can generate remarkable softening effect, so that the high-temperature rutting resistance of the biological asphalt is greatly reduced, and the actual requirements of high-temperature and heavy-load traffic in summer are difficult to meet. In order to solve the problem, polymer modifiers such as ethylene-vinyl acetate copolymer (EVA) are generally introduced for compounding in the prior art, and an attempt is made to improve the high-temperature modulus and mechanical strength of the material by utilizing a network structure formed by the polymers. However, such simple physical blending systems face significant compatibility challenges. The swill-cooked dirty oil is rich in fatty acid chains, the matrix asphalt contains a large amount of polycyclic aromatic hydrocarbon and asphaltene, and the EVA is semi-crystalline polymer, and the polarity and molecular structure of the three are greatly different. This difference results in EVA being extremely difficult to disperse in a swill-cooked dirty oil-rich asphalt matrix, with weak interfacial bonding. In the process of high-temperature storage or transportation, the ternary system is extremely easy to generate phase separation and segregation phenomena, namely polymer floating or grease precipitation occurs, and the storage stability of the modified asphalt is extremely poor. In addition, because the interface combination is not firm, the excessive softening effect of swill-cooked dirty oil on asphalt can not be effectively inhibited by an EVA network, so that the material is macroscopically insufficient in high-temperature deformation resistance, and rutting and pushing diseases are extremely easy to occur on the pavement. Therefore, developing a illegal cooking oil-based modified biological asphalt material capable of improving interface compatibility among illegal cooking oil, matrix asphalt and EVA (ethylene-vinyl acetate copolymer) simultaneously, so that excellent storage stability and high-temperature road performance are both considered, and the illegal cooking oil-based modified biological asphalt material is a technical problem to be solved in the field of current road engineering materials. Disclosure of Invention The invention aims to solve the technical problems that in the existing illegal cooking oil modified asphalt material, the interface binding force between illegal cooking oil, matrix asphalt and a polymer modifier is weak, the compatibility is poor, the material is easy to generate phase separation at high temperature, the storage stability is poor, and the high-temperature rutting resistance is greatly attenuated. Therefore, the invention provides the illegal cooking oil-based modified biological asphalt material and the preparation method thereof, which can obviously improve the compatibility of a ternary system and give consideration to excellent road performance and storage stability. In order to achieve the above purpose, the invention adopts the following technical scheme: The raw materials of the illegal cooking oil-based modified biological asphalt material comprise, by mass, 100 parts of matrix asphalt, 10 to 20 parts of pretreated illegal cooking oil, 3 to 8 parts of micromolecular modified ethylene-vinyl acetate copolymer, 0.5 to 2.0 parts of compatibilizer, 0.