CN111393865B - High-viscosity modified asphalt and preparation method thereof - Google Patents
High-viscosity modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-viscosity modified asphalt and a preparation method thereof, when the modified asphalt prepared by the scheme is actually applied to a drainage pavement, when water flows through each component of an asphalt mixture, hydrophobic groups in hydrophobic association copolymers in the modified asphalt are aggregated due to hydrophobic effect and associated in a macromolecular chain, so that the bonding property between the modified asphalt and each component can be effectively ensured, the oxidation resistance and the ageing resistance of a binder for the drainage asphalt pavement are improved, and the service life of the drainage asphalt pavement is prolonged; the preparation method disclosed by the invention is reasonable in process design and simple to operate, and the prepared modified asphalt is high in viscosity, excellent in high-temperature resistance, low-temperature crack resistance and aging resistance, capable of being applied to drainage pavements, capable of prolonging the service life of the drainage pavements and high in practicability.
Description
Technical Field
The invention relates to the technical field of asphalt processing, in particular to high-viscosity modified asphalt and a preparation method thereof.
Background
The drainage asphalt, also called permeable asphalt, refers to a novel asphalt concrete surface layer with porosity of about 20% after compaction and capable of forming a drainage channel in the mixture, and is essentially open-graded asphalt mixture with a framework-void structure formed by single-particle-size crushed stones according to an embedding and extruding mechanism. The drainage asphalt pavement adopts the large-gap asphalt mixture as the surface layer, rain falls penetrate into the drainage functional layer, and rain water is transversely discharged through the inside of the drainage functional layer, so that a road surface water film which brings many adverse effects of driving is eliminated, and the safety and the comfort of driving in rainy days are obviously improved.
With the rapid development of social economy, the pavement of the drainage asphalt pavement with the characteristic of large gaps begins to widely enter the field of urban road construction, the drainage asphalt pavement has higher performance requirements on asphalt, and the performances of the existing asphalt, such as toughness and toughness, cannot meet the requirements of people, so that inconvenience is brought to people.
Aiming at the problem, a high-viscosity modified asphalt and a preparation method thereof are designed, which are one of the technical problems to be solved urgently.
Disclosure of Invention
The invention aims to provide high-viscosity modified asphalt and a preparation method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the high-viscosity modified asphalt comprises the following raw materials: 90-95 parts of matrix asphalt, 2-3 parts of compatilizer, 5-15 parts of modification auxiliary agent, 1-2 parts of pretreated carbon nano tube, 2-3 parts of modified fiber, 7-8 parts of modified cyclodextrin, 6-8 parts of modified SBS and 0.5-1 part of stabilizer.
According to an optimized scheme, the raw materials of each component of the modification auxiliary agent comprise: by weight, 10-20 parts of ethylenediamine, 15-25 parts of methanol, 10-20 parts of methyl acrylate, 10-14 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-7 parts of sodium dodecyl sulfate, 10-20 parts of hydrophobic monomer and 3-5 parts of initiator.
According to an optimized scheme, the modified cyclodextrin comprises the following raw materials in parts by weight: 10-12 parts of cyclodextrin, 20-30 parts of sodium hydroxide, 8-14 parts of paratoluensulfonyl chloride, 8-14 parts of ethylenediamine and 4-6 parts of catalyst by weight.
According to an optimized scheme, the modified SBS comprises the following raw materials: by weight, 20-30 parts of SBS, 8-10 parts of maleic anhydride, 20-30 parts of cyclohexane, 0.5-1 part of benzoyl peroxide and 8-16 parts of acrylamide.
In an optimized scheme, the pretreated carbon nano tube is prepared from carbon nano tube, nitric acid, sulfuric acid and thionyl chloride; the modified fiber is prepared from lignin fiber, sodium hydroxide and epichlorohydrin.
In a more preferable scheme, the initiator is azobisisobutylamidine dihydrochloride, and the hydrophobic monomer is any one of methyl methacrylate, ethyl methacrylate and butyl methacrylate.
In an optimized scheme, the catalyst is 4-dimethylaminopyridine.
According to an optimized scheme, the preparation method of the high-viscosity modified asphalt comprises the following steps:
1) Preparing materials;
2) Preparation of pretreated carbon nanotubes: mixing nitric acid and sulfuric acid, adding the carbon nano tube, stirring at the constant temperature of 50-55 ℃, adjusting the pH value to be neutral, filtering, drying and ball-milling to obtain a modified carbon nano tube; adding dichlorosulfoxide into modified carbon nanotube, ultrasonically dispersing, reacting at 65-68 deg.C for 24 hr, and removing dichlorosulfoxide to obtain pretreated carbon nanotube;
3) Preparing modified fibers: putting the lignin fiber into a sodium hydroxide solution, stirring, adjusting the pH to 2, filtering, washing to be neutral, and drying in vacuum to obtain alkalized fiber; taking alkalized fiber, dissolving with sodium hydroxide, adding epichlorohydrin, stirring, heating to 80-85 deg.C, reacting, filtering, washing to neutrality, and vacuum drying to obtain modified fiber;
4) Preparing modified cyclodextrin: dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting at 20-23 ℃ for 2-3h, adjusting the pH to 8, standing, performing suction filtration, washing, drying, adding ethylenediamine and a catalyst after drying, stirring and reacting under a nitrogen environment, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and performing vacuum drying to obtain modified cyclodextrin;
5) Preparation of modified SBS:
a) Dissolving SBS, maleic anhydride and cyclohexane, stirring, placing in water bath at 80-85 ℃, dropwise adding benzoyl peroxide in nitrogen environment, reacting, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
b) Dissolving the material A, SBS and cyclohexane, stirring, adding acrylamide, continuously stirring, placing in a water bath at 70-75 ℃, dropwise adding a methylbenzene solution of benzoyl peroxide in a nitrogen environment, reacting, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
6) Preparing modified asphalt:
a) Putting the pretreated carbon nano tube into furfural extract oil for dissolving, and performing ultrasonic dispersion to obtain a first material; dissolving modified fiber with sodium hydroxide, and performing ultrasonic dispersion to obtain a second material; taking modified cyclodextrin, dissolving in methanol, adding methyl acrylate, stirring, heating to 25 ℃, and reacting for 24 hours to obtain a third material;
b) Taking matrix asphalt, heating to 150-160 ℃, adding a compatilizer, stirring, sequentially adding a first material and a second material, shearing at constant temperature, adjusting the temperature to 55 ℃, continuously adding a third material, reacting at constant temperature, heating, continuously reacting, adding ethylenediamine and methanol, and keeping the temperature at 25-28 ℃ for stirring reaction; obtaining a material B;
c) And taking the material B, adding modified SBS, shearing, adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring, adjusting pH, continuously adding sodium dodecyl sulfate, stirring, adding a hydrophobic monomer, heating to 55-60 ℃, continuously stirring, adding an initiator, reacting at constant temperature, adding a stabilizer, and shearing to obtain the modified asphalt.
The optimized scheme comprises the following steps:
1) Preparing materials;
2) Preparation of pretreated carbon nanotubes: mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in water bath at 50-55 deg.C, stirring at constant temperature for 12-13h, adjusting pH to neutral, filtering, drying, and ball milling for 20-30min to obtain modified carbon nano tube; adding thionyl chloride into the modified carbon nanotube, performing ultrasonic dispersion for 15-20min, reacting at 65-68 deg.C for 24 hr, and removing thionyl chloride to obtain pretreated carbon nanotube; in the step 2), the surface carboxylation treatment is carried out on the carbon nano tube by nitric acid and sulfuric acid to obtain a modified carbon nano tube, and then the acylation chlorination reaction is carried out by dichlorosulfoxide to prepare the pretreated carbon nano tube;
3) Preparing modified fibers: placing lignin fiber in sodium hydroxide solution, stirring for 10-20min, adjusting pH to 2, filtering, washing with distilled water to neutrality, and vacuum drying at 40-50 deg.C to obtain alkalized fiber; dissolving alkalized fiber with sodium hydroxide, adding epichlorohydrin, stirring for 20-30min, heating to 80-85 deg.C, reacting for 3-3.2h, vacuum filtering, washing to neutral, and vacuum drying at 40-45 deg.C to obtain modified fiber; modifying the lignin fiber in the step 3), placing the lignin fiber in a sodium hydroxide solution, and carrying out graft copolymerization on the lignin fiber and epichlorohydrin in an alkaline environment to generate modified fiber;
4) Preparing modified cyclodextrin: dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring for 10-15min, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting for 2-3h at 20-23 ℃, adjusting the pH to 8, standing for 24-26h, performing suction filtration, washing, drying, then adding ethylenediamine and a catalyst, stirring and reacting for 7-7.5h under a nitrogen environment, wherein the reaction temperature is 70-72 ℃, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and performing vacuum drying to obtain modified cyclodextrin; step 4) carrying out modification treatment on cyclodextrin, firstly taking cyclodextrin and p-toluenesulfonyl chloride as raw materials to prepare an intermediate product of p-toluenesulfonyl chloride substituted cyclodextrin, and then further generating ethylenediamine monosubstituted cyclodextrin (modified cyclodextrin) by using ethylenediamine and a catalyst, wherein the step aims to realize selective modification of primary hydroxyl of cyclodextrin by using the characteristic of high amino activity, and simultaneously introduce a new reaction site into cyclodextrin, and a academy in the subsequent step utilizes the mutual reaction between methyl acrylate and ethylenediamine, so that hyperbranched cyclodextrin can be generated by reaction in the subsequent step;
5) Preparation of modified SBS:
a) Dissolving SBS, maleic anhydride and cyclohexane, stirring for 20-30min, placing in 80-85 deg.C water bath, dripping benzoyl peroxide under nitrogen environment, reacting for 4-4.5 hr, precipitating with acetone, filtering, and drying to obtain material A;
b) Dissolving the material A, SBS and cyclohexane, stirring for 20-30min, adding acrylamide, continuing stirring for 20-30min, placing in a water bath at 70-75 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6-6.5h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
step 5) preparing modified SBS, firstly preparing SBS maleic anhydride product (material A) by SBS, maleic anhydride and other components, and using the product as emulsifier to make SBS and acrylamide generate graft reaction to prepare modified SBS, through the treatment step, the mechanical property of SBS can be effectively improved, and the comprehensive property of modified asphalt can be further improved;
6) Preparing modified asphalt:
a) Dissolving the pretreated carbon nano tube in furfural extract oil, and performing ultrasonic dispersion for 50-60min at the ultrasonic temperature of 80-85 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 5-10min to obtain a second material; dissolving modified cyclodextrin in methanol in ice water bath, adding methyl acrylate, stirring for 30-40min, heating to 25 deg.C, and reacting for 24 hr to obtain a third material;
b) Taking matrix asphalt, heating to 150-160 ℃, adding a compatilizer, stirring for 20-30min, sequentially adding a first material and a second material, shearing at a constant temperature for 40-50min at a shearing rate of 2000-2500rpm, adjusting the temperature to 55 ℃, continuously adding a third material, reacting at a constant temperature for 3-4h, heating to 65-70 ℃, continuously reacting for 24-26h, adding ethylenediamine and methanol, and keeping the temperature of 25-28 ℃ and stirring for reacting for 48-50h; obtaining a material B;
c) Adding modified SBS into the material B, shearing for 40-45min, adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 20-30min, adjusting pH to 6-7, continuously adding sodium dodecyl sulfate, stirring for 30-40min, adding a hydrophobic monomer, heating to 55-60 ℃, continuously stirring for 20-30min, adding an initiator, reacting for 7-8h at a constant temperature of 58-60 ℃, adding a stabilizer, and shearing for 100-120min to obtain the modified asphalt. In the step 6), furfural extract oil is taken as a solvent, pretreated carbon nano tubes are added into matrix asphalt, modified fibers and cyclodextrin are added, the cyclodextrin is adsorbed on the surfaces of the carbon nano tubes and the modified fibers by adjusting the reaction temperature and the reaction time, ethylenediamine and methanol are added, the cyclodextrin is subjected to Michael addition reaction and amidation reaction alternately to obtain hyperbranched cyclodextrin, modified SBS is added immediately, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium dodecyl sulfate, a hydrophobic monomer and the hyperbranched cyclodextrin are grafted on the surface of SBS for copolymerization, and the modified asphalt prepared by micelle polymerization is reacted in the matrix asphalt to generate a hydrophobic association copolymer.
In the step d) of the step 6), after adding the modified SBS, shearing at the shearing rate of 3000-3500rpm, wherein the shearing temperature is 120-130 ℃; after the stabilizer is added, the shearing rate is 2000-2100rpm, and the shearing temperature is 140-150 ℃.
Compared with the prior art, the invention has the beneficial effects that:
when the modified asphalt prepared by the scheme is actually applied to a drainage pavement, when water flows through all components of an asphalt mixture, hydrophobic groups in the hydrophobic association copolymer in the modified asphalt are aggregated due to hydrophobic effect and associated in a macromolecular chain, so that the bonding performance between the modified asphalt and all the components can be effectively ensured, the oxidation resistance and the ageing resistance of the binder for the drainage asphalt pavement are improved, and the service life of the drainage asphalt pavement is prolonged; in the invention, the components such as SBS, carbon nano tube and the like are added into the matrix asphalt, so that an elastic network is generated in an asphalt system, and the high-temperature stability, the low-temperature crack resistance and the aging resistance of the prepared modified asphalt are all improved.
The invention discloses high-viscosity modified asphalt and a preparation method thereof, the process design is reasonable, the operation is simple, the prepared modified asphalt has high viscosity, excellent high temperature resistance, low temperature crack resistance and aging resistance, can be applied to drainage road surfaces, prolongs the service life of the drainage road surfaces, and has higher practicability.
Detailed Description
The technical solutions in the examples of the present invention will be described clearly and completely below, and it is obvious that the described examples are only a part of examples of the present invention, but not all examples. All other examples, which can be obtained by a person skilled in the art without making any creative effort based on the examples in the present invention, belong to the protection scope of the present invention.
Example 1:
s1: preparing materials;
s2: preparation of pretreated carbon nanotubes:
mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in a water bath at 50 ℃, stirring at constant temperature for 12h, adjusting pH to be neutral, filtering, drying, and ball-milling for 20min to obtain a modified carbon nano tube; adding dichlorosulfoxide into the modified carbon nanotube, performing ultrasonic dispersion for 15min, reacting at 65 deg.C for 24 hr, and removing dichlorosulfoxide to obtain pretreated carbon nanotube;
s3: preparing modified fibers:
placing lignin fiber in sodium hydroxide solution, stirring for 10min, adjusting pH to 2, filtering, washing with distilled water to neutrality, and vacuum drying at 40 deg.C to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 20min, heating to 80 ℃, reacting for 3h, performing suction filtration, washing to be neutral, and performing vacuum drying at 40 ℃ to obtain modified fiber;
s4: preparing modified cyclodextrin:
dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring for 10min, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting for 2h at 20 ℃, adjusting the pH to 8, standing for 24h, performing suction filtration, washing, drying, then adding ethylenediamine and a catalyst, stirring and reacting for 7h under a nitrogen environment, wherein the reaction temperature is 70 ℃, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and drying in vacuum to obtain modified cyclodextrin;
s5: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 20min, placing in a water bath at 80 ℃, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A and SBS in cyclohexane, stirring for 20min, adding acrylamide, stirring for 20min, placing in a 70 ℃ water bath, dropwise adding a benzoyl peroxide toluene solution in a nitrogen environment, reacting for 6h, precipitating with acetone, filtering, and drying in vacuum to obtain modified SBS;
s6: preparing modified asphalt:
dissolving the pretreated carbon nano tube in furfural extract oil, and performing ultrasonic dispersion for 50min at the ultrasonic temperature of 80 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 5min to obtain a second material; dissolving modified cyclodextrin in methanol in ice-water bath, adding methyl acrylate, stirring for 30min, heating to 25 deg.C, and reacting for 24 hr to obtain a third material;
taking matrix asphalt, heating to 150 ℃, adding a compatilizer, stirring for 20min, sequentially adding a first material and a second material, shearing at a constant temperature for 40min at a shearing rate of 2000rpm, adjusting the temperature to 55 ℃, continuously adding a third material, reacting at the constant temperature for 3h, heating to 65 ℃, continuously reacting for 24h, adding ethylenediamine and methanol, and stirring and reacting for 48h at the temperature of 25 ℃; obtaining a material B;
adding modified SBS into the material B, and shearing for 40min at the shearing rate of 3000rpm and the shearing temperature of 120 ℃; adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 20min, adjusting the pH to 6, continuously adding sodium dodecyl sulfate, stirring for 30min, adding a hydrophobic monomer, heating to 55 ℃, continuously stirring for 20min, adding an initiator, reacting at a constant temperature of 58 ℃ for 7h, adding a stabilizer, shearing for 100min at a shearing rate of 2000rpm at a shearing temperature of 140 ℃, and thus obtaining the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise: by weight, 90 parts of matrix asphalt, 2 parts of compatilizer, 5 parts of modification auxiliary agent, 1 part of pretreated carbon nanotube, 2 parts of modified fiber, 7 parts of modified cyclodextrin, 6 parts of modified SBS and 0.5 part of stabilizer.
Wherein the raw materials of each component of the modification auxiliary agent comprise: by weight, 10 parts of ethylenediamine, 15 parts of methanol, 10 parts of methyl acrylate, 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of sodium dodecyl sulfate, 10 parts of hydrophobic monomer and 3 parts of initiator; the modified cyclodextrin comprises the following raw materials: 10 parts of cyclodextrin, 20 parts of sodium hydroxide, 8 parts of paratoluensulfonyl chloride, 8 parts of ethylenediamine and 4 parts of catalyst by weight;
the modified SBS comprises the following raw materials: by weight, 20 parts of SBS, 8 parts of maleic anhydride, 20 parts of cyclohexane, 0.5 part of benzoyl peroxide and 8 parts of acrylamide; the initiator is azodiisobutyl amidine dihydrochloride, and the hydrophobic monomer is methyl methacrylate; the catalyst is 4-dimethylamino pyridine.
Example 2:
s1: preparing materials;
s2: preparation of pretreated carbon nanotubes:
mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in water bath at 52 ℃, stirring at constant temperature for 12.5h, adjusting pH to be neutral, filtering, drying, and ball-milling for 25min to obtain modified carbon nano tube; adding dichlorosulfoxide into the modified carbon nanotube, performing ultrasonic dispersion for 18min, reacting at 67 deg.C for 24 hr, and removing dichlorosulfoxide to obtain pretreated carbon nanotube;
s3: preparing modified fibers:
putting the lignin fiber into a sodium hydroxide solution, stirring for 15min, adjusting the pH to 2, filtering, washing to be neutral by distilled water, and drying in vacuum at 45 ℃ to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 25min, heating to 82 ℃, reacting for 3.1h, performing suction filtration, washing to be neutral, and performing vacuum drying at 42 ℃ to obtain modified fiber;
s4: preparing modified cyclodextrin:
dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring for 13min, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting for 2.5h at 21 ℃, adjusting the pH to 8, standing for 25h, performing suction filtration, washing, drying, adding ethylenediamine and a catalyst after drying, stirring and reacting for 7.2h under a nitrogen environment at the reaction temperature of 71 ℃, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and drying in vacuum to obtain modified cyclodextrin;
s5: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 ℃ water bath, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.2h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A, SBS and cyclohexane, stirring for 25min, adding acrylamide, continuing stirring for 25min, placing in a water bath at 72 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6.2h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
s6: preparing modified asphalt:
putting the pretreated carbon nano tube into furfural extract oil for dissolving, and performing ultrasonic dispersion for 55min at the ultrasonic temperature of 83 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 8min to obtain a second material; dissolving modified cyclodextrin in methanol in ice water bath, adding methyl acrylate, stirring for 35min, heating to 25 deg.C, and reacting for 24 hr to obtain a third material;
taking matrix asphalt, heating to 155 ℃, adding a compatilizer, stirring for 25min, sequentially adding a first material and a second material, carrying out constant temperature shearing for 45min at the shearing rate of 2200rpm, adjusting the temperature to 55 ℃, continuously adding a third material, carrying out constant temperature reaction for 3.5h, heating to 68 ℃, continuing to react for 25h, adding ethylenediamine and methanol, and keeping the temperature at 27 ℃ and carrying out stirring reaction for 49h; obtaining a material B;
taking the material B, adding the modified SBS, and shearing for 42min at a shearing rate of 3200rpm and a shearing temperature of 125 ℃; and adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 25min, adjusting the pH to 6, continuously adding sodium dodecyl sulfate, stirring for 35min, adding a hydrophobic monomer, heating to 58 ℃, continuously stirring for 25min, adding an initiator, reacting at the constant temperature of 59 ℃ for 7.5h, adding a stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In the embodiment, the raw materials of each component of the modified asphalt comprise: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 10 parts of modification auxiliary agent, 1.5 parts of pretreated carbon nano tube, 2.5 parts of modified fiber, 7.5 parts of modified cyclodextrin, 7 parts of modified SBS and 0.8 part of stabilizer by weight.
The modified auxiliary agent comprises the following raw materials: by weight, 15 parts of ethylenediamine, 20 parts of methanol, 15 parts of methyl acrylate, 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of sodium dodecyl sulfate, 15 parts of hydrophobic monomer and 4 parts of initiator; the modified cyclodextrin comprises the following raw materials: 11 parts of cyclodextrin, 25 parts of sodium hydroxide, 12 parts of paratoluensulfonyl chloride, 12 parts of ethylenediamine and 5 parts of catalyst by weight;
the modified SBS comprises the following raw materials: 25 parts of SBS, 9 parts of maleic anhydride, 25 parts of cyclohexane, 0.8 part of benzoyl peroxide and 13 parts of acrylamide; the initiator is azodiisobutyl amidine dihydrochloride, and the hydrophobic monomer is ethyl methacrylate; the catalyst is 4-dimethylamino pyridine.
Example 3:
s1: preparing materials;
s2: preparation of pretreated carbon nanotubes:
mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in water bath at 55 ℃, stirring at constant temperature for 13h, adjusting pH to be neutral, filtering, drying, and ball-milling for 30min to obtain modified carbon nano tube; adding dichlorosulfoxide into the modified carbon nanotube, performing ultrasonic dispersion for 20min, reacting at 68 deg.C for 24 hr, and removing dichlorosulfoxide to obtain pretreated carbon nanotube;
s3: preparing modified fibers:
placing lignin fiber in sodium hydroxide solution, stirring for 20min, adjusting pH to 2, filtering, washing with distilled water to neutrality, and vacuum drying at 50 deg.C to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 30min, heating to 85 ℃, reacting for 3.2h, performing suction filtration, washing to be neutral, and performing vacuum drying at 45 ℃ to obtain modified fiber;
s4: preparing modified cyclodextrin:
dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring for 15min, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting for 3h at 23 ℃, adjusting the pH to 8, standing for 26h, performing suction filtration, washing, drying, then adding ethylenediamine and a catalyst, stirring and reacting for 7.5h under a nitrogen environment, wherein the reaction temperature is 72 ℃, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and drying in vacuum to obtain modified cyclodextrin;
s5: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 30min, placing in a water bath at 85 ℃, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.5h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A and SBS in cyclohexane, stirring for 30min, adding acrylamide, stirring for 30min, placing in a water bath at 75 ℃, dropwise adding a methylbenzene solution of benzoyl peroxide in a nitrogen environment, reacting for 6.5h, precipitating with acetone, performing suction filtration, and drying in vacuum to obtain modified SBS;
s6: preparing modified asphalt:
putting the pretreated carbon nano tube into furfural extract oil for dissolving, and performing ultrasonic dispersion for 60min at the ultrasonic temperature of 85 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 10min to obtain a second material; dissolving modified cyclodextrin in methanol in ice-water bath, adding methyl acrylate, stirring for 40min, heating to 25 deg.C, and reacting for 24 hr to obtain a third material;
taking matrix asphalt, heating to 160 ℃, adding a compatilizer, stirring for 30min, sequentially adding a first material and a second material, carrying out constant temperature shearing for 50min at a shearing speed of 2500rpm, adjusting the temperature to 55 ℃, continuously adding a third material, carrying out constant temperature reaction for 4h, heating to 70 ℃, continuously reacting for 26h, adding ethylenediamine and methanol, and keeping the temperature at 28 ℃ and stirring for reacting for 50h; obtaining a material B;
taking the material B, adding the modified SBS, and shearing for 45min at a shearing rate of 3500rpm and a shearing temperature of 130 ℃; adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 30min, adjusting the pH to 7, continuously adding sodium dodecyl sulfate, stirring for 40min, adding a hydrophobic monomer, heating to 60 ℃, continuously stirring for 30min, adding an initiator, reacting at the constant temperature of 60 ℃ for 8h, adding a stabilizer, shearing for 120min at the shearing rate of 2100rpm at the shearing temperature of 150 ℃, and obtaining the modified asphalt.
In the embodiment, the modified asphalt comprises the following raw materials: 95 parts of matrix asphalt, 3 parts of compatilizer, 15 parts of modification auxiliary agent, 2 parts of pretreated carbon nano tube, 3 parts of modified fiber, 8 parts of modified cyclodextrin, 8 parts of modified SBS and 1 part of stabilizer.
Wherein the raw materials of each component of the modification auxiliary agent comprise: by weight, 20 parts of ethylenediamine, 25 parts of methanol, 20 parts of methyl acrylate, 14 parts of 2-acrylamide-2-methylpropanesulfonic acid, 7 parts of sodium dodecyl sulfate, 20 parts of hydrophobic monomer and 5 parts of initiator; the modified cyclodextrin comprises the following raw materials: 12 parts of cyclodextrin, 30 parts of sodium hydroxide, 14 parts of paratoluensulfonyl chloride, 14 parts of ethylenediamine and 6 parts of catalyst by weight;
the modified SBS comprises the following raw materials: 30 parts of SBS, 10 parts of maleic anhydride, 30 parts of cyclohexane, 1 part of benzoyl peroxide and 16 parts of acrylamide; the initiator is azobisisobutylamidine dihydrochloride, and the hydrophobic monomer is butyl methacrylate; the catalyst is 4-dimethylamino pyridine.
Comparative example 1:
s1: preparing materials;
s2: preparation of pretreated carbon nanotubes:
mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in water bath at 52 ℃, stirring at constant temperature for 12.5h, adjusting pH to be neutral, filtering, drying, and ball-milling for 25min to obtain modified carbon nano tube; adding dichlorosulfoxide into the modified carbon nanotube, performing ultrasonic dispersion for 18min, reacting at 67 deg.C for 24 hr, and removing dichlorosulfoxide to obtain pretreated carbon nanotube;
s3: preparing modified fibers:
putting the lignin fiber into a sodium hydroxide solution, stirring for 15min, adjusting the pH to 2, filtering, washing to be neutral by distilled water, and drying in vacuum at 45 ℃ to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 25min, heating to 82 ℃, reacting for 3.1h, performing suction filtration, washing to be neutral, and performing vacuum drying at 42 ℃ to obtain modified fiber;
s4: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 ℃ water bath, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.2h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A and SBS in cyclohexane, stirring for 25min, adding acrylamide, stirring for 25min, placing in a 72 ℃ water bath, dropwise adding a benzoyl peroxide toluene solution in a nitrogen environment, reacting for 6.2h, precipitating with acetone, filtering, and drying in vacuum to obtain modified SBS;
s5: preparing modified asphalt:
putting the pretreated carbon nano tube into furfural extract oil for dissolving, and performing ultrasonic dispersion for 55min at the ultrasonic temperature of 83 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 8min to obtain a second material;
taking matrix asphalt, heating to 155 ℃, adding a compatilizer, stirring for 25min, sequentially adding a first material and a second material, and shearing at a constant temperature for 45min at a shearing rate of 2200rpm to obtain a material B;
taking the material B, adding the modified SBS, and shearing for 42min at a shearing rate of 3200rpm and a shearing temperature of 125 ℃; and adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 25min, adjusting the pH to 6, continuously adding sodium dodecyl sulfate, stirring for 35min, adding a hydrophobic monomer, heating to 58 ℃, continuously stirring for 25min, adding an initiator, reacting at the constant temperature of 59 ℃ for 7.5h, adding a stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In this comparative example, the modified asphalt comprises the following raw materials: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 10 parts of modification auxiliary agent, 1.5 parts of pretreated carbon nano tube, 2.5 parts of modified fiber, 7 parts of modified SBS and 0.8 part of stabilizer.
Wherein the raw materials of each component of the modification auxiliary agent comprise: by weight, 15 parts of ethylenediamine, 20 parts of methanol, 15 parts of methyl acrylate, 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of sodium dodecyl sulfate, 15 parts of hydrophobic monomer and 4 parts of initiator;
the modified SBS comprises the following raw materials: 25 parts of SBS, 9 parts of maleic anhydride, 25 parts of cyclohexane, 0.8 part of benzoyl peroxide and 13 parts of acrylamide; the initiator is azo-diisobutyl amidine dihydrochloride, and the hydrophobic monomer is ethyl methacrylate.
Comparative example 2:
s1: preparing materials;
s2: preparing modified fibers:
putting the lignin fiber into a sodium hydroxide solution, stirring for 15min, adjusting the pH to 2, filtering, washing to be neutral by distilled water, and drying in vacuum at 45 ℃ to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 25min, heating to 82 ℃, reacting for 3.1h, performing suction filtration, washing to be neutral, and performing vacuum drying at 42 ℃ to obtain modified fiber;
s3: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 ℃ water bath, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.2h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A and SBS in cyclohexane, stirring for 25min, adding acrylamide, stirring for 25min, placing in a 72 ℃ water bath, dropwise adding a benzoyl peroxide toluene solution in a nitrogen environment, reacting for 6.2h, precipitating with acetone, filtering, and drying in vacuum to obtain modified SBS;
s4: preparing modified asphalt:
dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 8min to obtain a second material; taking matrix asphalt, heating to 155 ℃, adding a compatilizer, stirring for 25min, sequentially adding a second material, and shearing at constant temperature for 45min at the shearing rate of 2200rpm to obtain a material B;
taking the material B, adding the modified SBS, and shearing for 42min at a shearing rate of 3200rpm and a shearing temperature of 125 ℃; and adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 25min, adjusting the pH to 6, continuously adding sodium dodecyl sulfate, stirring for 35min, adding a hydrophobic monomer, heating to 58 ℃, continuously stirring for 25min, adding an initiator, reacting at the constant temperature of 59 ℃ for 7.5h, adding a stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In the comparative example, the modified asphalt comprises the following raw materials: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 10 parts of modification auxiliary agent, 2.5 parts of modified fiber, 7 parts of modified SBS and 0.8 part of stabilizer by weight.
Wherein the raw materials of each component of the modification auxiliary agent comprise: by weight, 15 parts of ethylenediamine, 20 parts of methanol, 15 parts of methyl acrylate, 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of sodium dodecyl sulfate, 15 parts of hydrophobic monomer and 4 parts of initiator;
the modified SBS comprises the following raw materials: 25 parts of SBS, 9 parts of maleic anhydride, 25 parts of cyclohexane, 0.8 part of benzoyl peroxide and 13 parts of acrylamide; the initiator is azobisisobutylamidine dihydrochloride, and the hydrophobic monomer is ethyl methacrylate.
Comparative example 3:
s1: preparing materials;
s2: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 ℃ water bath, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.2h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A, SBS and cyclohexane, stirring for 25min, adding acrylamide, continuing stirring for 25min, placing in a water bath at 72 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6.2h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
s3: preparing modified asphalt:
taking matrix asphalt, heating to 155 ℃, adding a compatilizer, and stirring for 25min to obtain a material B; adding modified SBS into the material B, and shearing for 42min at 3200rpm and 125 deg.C; and adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 25min, adjusting the pH to 6, continuously adding sodium dodecyl sulfate, stirring for 35min, adding a hydrophobic monomer, heating to 58 ℃, continuously stirring for 25min, adding an initiator, reacting at the constant temperature of 59 ℃ for 7.5h, adding a stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In the comparative example, the modified asphalt comprises the following raw materials: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 10 parts of modification auxiliary agent, 7 parts of modified SBS and 0.8 part of stabilizer by weight.
Wherein the raw materials of each component of the modification auxiliary agent comprise: by weight, 15 parts of ethylenediamine, 20 parts of methanol, 15 parts of methyl acrylate, 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of sodium dodecyl sulfate, 15 parts of hydrophobic monomer and 4 parts of initiator;
the modified SBS comprises the following raw materials: 25 parts of SBS, 9 parts of maleic anhydride, 25 parts of cyclohexane, 0.8 part of benzoyl peroxide and 13 parts of acrylamide; the initiator is azobisisobutylamidine dihydrochloride, and the hydrophobic monomer is ethyl methacrylate.
Comparative example 4:
s1: preparing materials;
s2: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 ℃ water bath, dropwise adding benzoyl peroxide in a nitrogen environment, reacting for 4.2h, precipitating with acetone, and performing suction filtration and drying to obtain a material A;
dissolving the material A, SBS and cyclohexane, stirring for 25min, adding acrylamide, continuing stirring for 25min, placing in a water bath at 72 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6.2h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
s3: preparing modified asphalt:
heating the matrix asphalt to 155 ℃, adding the compatilizer, and stirring for 25min to obtain a material B; and adding the modified SBS into the material B, shearing for 42min at the shearing rate of 3200rpm and the shearing temperature of 125 ℃, adding the stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In the comparative example, the modified asphalt comprises the following raw materials: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 7 parts of modified SBS and 0.8 part of stabilizer by weight. Wherein the modified SBS comprises the following raw materials in parts by weight: 25 parts of SBS, 9 parts of maleic anhydride, 25 parts of cyclohexane, 0.8 part of benzoyl peroxide and 13 parts of acrylamide.
Comparative example 5:
s1: preparing materials;
s2: preparation of modified SBS:
dissolving SBS, maleic anhydride and cyclohexane, stirring for 25min, placing in 82 deg.C water bath, dripping benzoyl peroxide under nitrogen environment, reacting for 4.2h, precipitating with acetone, filtering, and drying to obtain material A;
dissolving the material A, SBS and cyclohexane, stirring for 25min, adding acrylamide, continuing stirring for 25min, placing in a water bath at 72 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6.2h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
s3: preparing modified asphalt:
taking matrix asphalt, heating to 155 ℃, adding a compatilizer, and stirring for 25min to obtain a material B; and adding SBS into the material B, shearing for 42min at the shearing rate of 3200rpm and the shearing temperature of 125 ℃, adding the stabilizer, and shearing for 110min at the shearing rate of 2050rpm and the shearing temperature of 145 ℃ to obtain the modified asphalt.
In the comparative example, the modified asphalt comprises the following raw materials: 92 parts of matrix asphalt, 2.5 parts of compatilizer, 7 parts of SBS and 0.8 part of stabilizer by weight.
Detection experiment:
the modified asphalt prepared in examples 1 to 3 and comparative examples 1 to 5 were used to test the relevant performance indexes of the modified asphalt according to the test methods specified in the test procedure for road engineering asphalt and asphalt mixture (JTGE 20-2011), and the test results are shown in the following table:
as can be seen from the above, examples 1-3 are modified asphalts prepared by the technical scheme of the application; the modified cyclodextrin is absent in comparative example 1, the modified cyclodextrin and the pretreated carbon nanotube are absent in comparative example 2, the modified cyclodextrin, the pretreated carbon nanotube and the modified fiber are absent in comparative example 3, the modified cyclodextrin, the pretreated carbon nanotube, the modified fiber and the modification assistant are absent in comparative example 4, and the conventional SBS modified asphalt is employed in comparative example 5.
And (4) conclusion: the preparation method disclosed by the invention is reasonable in process design and simple to operate, the prepared modified asphalt is high in viscosity, meets various index requirements, has excellent high-temperature resistance, low-temperature crack resistance and aging resistance, can be applied to drainage pavements, prolongs the service life of the drainage pavements, is good in water permeability, and has high practicability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative examples and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (3)
1. A high-viscosity modified asphalt is characterized in that: the modified asphalt comprises the following raw materials: 90-95 parts of matrix asphalt, 2-3 parts of compatilizer, 5-15 parts of modification auxiliary agent, 1-2 parts of pretreated carbon nano tube, 2-3 parts of modified fiber, 7-8 parts of modified cyclodextrin, 6-8 parts of modified SBS and 0.5-1 part of stabilizer by weight;
the modified auxiliary agent comprises the following raw materials: 10-20 parts of ethylenediamine, 15-25 parts of methanol, 10-20 parts of methyl acrylate, 10-14 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-7 parts of sodium dodecyl sulfate, 10-20 parts of hydrophobic monomer and 3-5 parts of initiator by weight;
the modified cyclodextrin comprises the following raw materials in parts by weight: 10-12 parts of cyclodextrin, 20-30 parts of sodium hydroxide, 8-14 parts of paratoluensulfonyl chloride, 8-14 parts of ethylenediamine and 4-6 parts of catalyst by weight;
the modified SBS comprises the following raw materials in parts by weight: 20-30 parts of SBS, 8-10 parts of maleic anhydride, 20-30 parts of cyclohexane, 0.5-1 part of benzoyl peroxide and 8-16 parts of acrylamide;
the initiator is azobisisobutylamidine dihydrochloride, and the hydrophobic monomer is any one of methyl methacrylate, ethyl methacrylate and butyl methacrylate;
the preparation method of the high-viscosity modified asphalt comprises the following steps:
1) Preparing materials;
2) Preparation of pretreated carbon nanotubes: mixing nitric acid and sulfuric acid, adding carbon nano tube, placing in water bath at 50-55 deg.C, stirring at constant temperature for 12-13h, adjusting pH to neutral, filtering, drying, and ball milling for 20-30min to obtain modified carbon nano tube; taking the modified carbon nano tube, adding thionyl chloride, performing ultrasonic dispersion for 15-20min, reacting at 65-68 ℃ for 24h, and removing the thionyl chloride after the reaction to obtain a pretreated carbon nano tube;
3) Preparing modified fibers: placing lignin fiber in sodium hydroxide solution, stirring for 10-20min, adjusting pH to 2, filtering, washing with distilled water to neutrality, and vacuum drying at 40-50 deg.C to obtain alkalized fiber; dissolving the alkalized fiber and sodium hydroxide, adding epoxy chloropropane, stirring for 20-30min, heating to 80-85 deg.C, reacting for 3-3.2h, vacuum filtering, washing to neutrality, and vacuum drying at 40-45 deg.C to obtain modified fiber;
4) Preparing modified cyclodextrin: dissolving cyclodextrin in distilled water, slowly dropwise adding a sodium hydroxide solution, stirring for 10-15min, adding an acetonitrile solution of p-toluenesulfonyl chloride, reacting for 2-3h at 20-23 ℃, adjusting the pH to 8, standing for 24-26h, performing suction filtration, washing, drying, then adding ethylenediamine and a catalyst, stirring and reacting for 7-7.5h under a nitrogen environment, wherein the reaction temperature is 70-72 ℃, cooling to room temperature, stirring and crystallizing acetone, filtering, washing, and performing vacuum drying to obtain modified cyclodextrin;
5) Preparation of modified SBS:
a) Dissolving SBS, maleic anhydride and cyclohexane, stirring for 20-30min, placing in 80-85 deg.C water bath, dripping benzoyl peroxide under nitrogen environment, reacting for 4-4.5 hr, precipitating with acetone, filtering, and drying to obtain material A;
b) Dissolving the material A, SBS and cyclohexane, stirring for 20-30min, adding acrylamide, continuing stirring for 20-30min, placing in a water bath at 70-75 ℃, dropwise adding a toluene solution of benzoyl peroxide in a nitrogen environment, reacting for 6-6.5h, precipitating with acetone, performing suction filtration, and performing vacuum drying to obtain modified SBS;
6) Preparing modified asphalt:
a) Placing the pretreated carbon nano tube in furfural extract oil for dissolving, and performing ultrasonic dispersion for 50-60min at the ultrasonic temperature of 80-85 ℃ to obtain a first material; dissolving modified fiber with sodium hydroxide, and ultrasonically dispersing for 5-10min to obtain a second material; dissolving modified cyclodextrin in methanol in ice water bath, adding methyl acrylate, stirring for 30-40min, heating to 25 deg.C, and reacting for 24 hr to obtain a third material;
b) Taking matrix asphalt, heating to 150-160 ℃, adding a compatilizer, stirring for 20-30min, sequentially adding a first material and a second material, shearing at a constant temperature of 2000-2500rpm for 40-50min, adjusting the temperature to 55 ℃, continuously adding a third material, reacting at a constant temperature for 3-4h, heating to 65-70 ℃, continuously reacting for 24-26h, adding ethylenediamine and methanol, and keeping the temperature at 25-28 ℃ for stirring and reacting for 48-50h; obtaining a material B;
c) Adding modified SBS into the material B, shearing for 40-45min, adding 2-acrylamide-2-methylpropanesulfonic acid and distilled water, stirring for 20-30min, adjusting pH to 6-7, continuously adding sodium dodecyl sulfate, stirring for 30-40min, adding a hydrophobic monomer, heating to 55-60 ℃, continuously stirring for 20-30min, adding an initiator, reacting for 7-8h at a constant temperature of 58-60 ℃, adding a stabilizer, and shearing for 100-120min to obtain the modified asphalt.
2. The high-viscosity modified asphalt according to claim 1, characterized in that: the catalyst is 4-dimethylamino pyridine.
3. The high-viscosity modified asphalt according to claim 1, characterized in that: in the step c) of the step 6), after the modified SBS is added, shearing is carried out at the shearing rate of 3000-3500rpm, and the shearing temperature is 120-130 ℃; after the stabilizer is added, the shearing rate is 2000-2100rpm, and the shearing temperature is 140-150 ℃.
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