CN116178974A - Non-sticky emulsified asphalt as well as preparation method and application thereof - Google Patents
Non-sticky emulsified asphalt as well as preparation method and application thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 206
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 101
- 239000004816 latex Substances 0.000 claims abstract description 27
- 229920000126 latex Polymers 0.000 claims abstract description 27
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000000853 adhesive Substances 0.000 claims abstract description 6
- 230000001070 adhesive effect Effects 0.000 claims abstract description 6
- 239000003995 emulsifying agent Substances 0.000 claims description 58
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 28
- 239000011159 matrix material Substances 0.000 claims description 25
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 24
- 239000011780 sodium chloride Substances 0.000 claims description 14
- 239000003607 modifier Substances 0.000 claims description 11
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 239000001361 adipic acid Substances 0.000 claims description 4
- 235000011037 adipic acid Nutrition 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 21
- 239000012790 adhesive layer Substances 0.000 abstract description 17
- 239000010410 layer Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- 239000000839 emulsion Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000001804 emulsifying effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/24—Binder incorporated as an emulsion or solution
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
- C08L95/005—Aqueous compositions, e.g. emulsions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Architecture (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides non-sticky wheel emulsified asphalt, a preparation method and application thereof, and particularly relates to the technical field of emulsified asphalt. The non-sticking wheel emulsified asphalt comprises nano SiO 2 Emulsified asphalt and high latex asphalt. In the non-sticky wheel emulsified asphalt provided by the invention, nano SiO 2 The surface of the emulsified asphalt liquid drop is uniformly embedded with a layer of solid nano SiO 2 The particle, the compact solid interface film formed, the protection effect to the liquid drop is stronger, thus make its stability more outstanding, and combine the high latex asphalt that the high temperature performance is excellent, when realizing the wheel-sticking-free effect, make up the current wheel-sticking-free emulsified asphalt cost higher, the not enough problem of storage stability. The non-sticky wheel emulsified asphalt provided by the invention has the storage stability of only 0.2% in 1d and only 0.8% in 5 d; and the roller is not stuck at the temperature of 60 ℃ and the low temperature of minus 5 DEG CThe adhesive has no granular feel during storage, has good stability, and can meet the severe storage requirement of severe natural environment in remote areas on the adhesive layer.
Description
Technical Field
The invention relates to the technical field of emulsified asphalt, in particular to non-sticky wheel emulsified asphalt, a preparation method and application thereof.
Background
Asphalt pavement belongs to a multilayer lamellar continuous system, and the bonding performance among asphalt pavement layers is important. The adhesion layer is the most important factor for ensuring the adhesion performance between asphalt layers, but after the emulsified asphalt adhesion layer is constructed on site, a construction operation vehicle can adhere part of the adhesion layer and separate the part of the adhesion layer from the original position, and the phenomenon of adhering wheels can cause the part of adhesion layer oil to remain on the wheels to cause the adhesion layer to be lost, so that the adhesion performance between asphalt layers at the part of the adhesion layer which is lost can be seriously influenced, and the occurrence probability of early diseases such as slippage, fatigue cracking or spalling is further increased.
Although the existing non-sticky wheel emulsified asphalt products are popularized and applied, the nature of the existing non-sticky wheel emulsified asphalt products is common emulsified asphalt based on a surfactant, the storage stability is still not improved, and the storage requirements of severe natural environments in remote areas on adhesive layer materials cannot be met.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide non-sticky emulsified asphalt, which aims to solve the technical problem that the emulsified asphalt cannot adapt to severe natural environments in remote areas due to poor storage stability in the prior art.
The second purpose of the invention is to provide a preparation method of the non-sticky wheel emulsified asphalt.
The invention further aims to provide an application of the wheel-free emulsified asphalt in an asphalt pavement bonding layer.
In order to solve the technical problems, the invention adopts the following technical scheme:
the first aspect of the invention provides a non-sticky wheel emulsified asphalt, which comprises nano SiO 2 Emulsified asphalt and high latex asphalt.
Further, nano SiO 2 The weight ratio of emulsified asphalt to high latex asphalt is 0.8-1.2:0.8-1.2, preferably 1:1.
Preferably, the solid content of the evaporation residue of the high-latex asphalt is more than or equal to 50%, the softening point is more than or equal to 80 ℃, and the dynamic viscosity at 60 ℃ is more than or equal to 20000Pa.s.
Preferably, the nano SiO 2 The solid content of the emulsified asphalt is 50-60%, and the spreading amount is 0.4kg/m 2 -0.6kg/m 2 。
Further, the nano SiO 2 The emulsified asphalt comprises nano SiO 2 Emulsifying agents and matrix asphalt.
Preferably, the grade of the matrix asphalt includes at least one of # 50, # 70 and # 90.
Preferably, the nano SiO 2 The emulsifier is arranged on the nano SiO 2 The mass ratio of the emulsified asphalt is 50-60%.
Preferably, the matrix asphalt is on the nano SiO 2 The mass ratio of the emulsified asphalt is 40-50%.
Preferably, the nano SiO 2 The pH of the emulsifier is 2-3.
Further, according to parts by weight, the nano SiO 2 The emulsifier comprises 85-90 parts of alkaline silica sol solution, 0.6-0.7 part of surface modifier and 11.3-14.4 parts of sodium chloride.
Preferably, the surface modifying agent comprises adipic acid mono-acyl diethanolamine.
Preferably, the alkaline silica sol solution comprises nano SiO 2 The nano SiO 2 The average grain diameter of the nano SiO is 28nm-40nm 2 The mass content of (2) is 4.5% -5.5%.
Preferably, the alkaline silicon is dissolvedThe pH of the gel solution is 9-10, the viscosity is 2 Pa.s-2.5 Pa.s, and the density is 1.1g/cm 2 -1.3g/cm 2 。
The second aspect of the invention provides a preparation method of the non-sticky wheel emulsified asphalt, which comprises the steps of mixing the nano SiO 2 Placing the emulsified asphalt on dispersing equipment, preserving heat at 50-60 ℃, and adding the high-latex asphalt for uniform dispersion to obtain the non-sticky wheel emulsified asphalt.
Further, the dispersing apparatus comprises a high speed shear.
Preferably, the dispersing speed is 2000r/min to 2500r/min.
Further, the nano SiO 2 The preparation method of the emulsified asphalt comprises the following steps:
A. adding a surfactant into an alkaline silica sol solution, adding acid to adjust pH, and finally adding sodium chloride to obtain the nano SiO 2 An emulsifying agent;
B. at the nano SiO 2 Adding matrix asphalt into the emulsifier, and uniformly dispersing to obtain the nano SiO 2 Emulsified asphalt.
Further, the temperature of the alkaline silica sol solution is 50-70 ℃.
Preferably, in step B, the nano SiO 2 The temperature of the emulsifier is 70-90 ℃.
Preferably, in step B, the temperature of the matrix asphalt is 140 ℃ to 150 ℃.
Further, the dispersing speed is 3000r/min-4000r/min.
The third aspect of the invention provides the application of the wheel-free emulsified asphalt in an asphalt pavement adhesive layer.
Compared with the prior art, the invention has at least the following beneficial effects:
in the non-sticky wheel emulsified asphalt provided by the invention, nano SiO 2 The surface of the emulsified asphalt liquid drop is uniformly embedded with a layer of solid nano SiO 2 The particles form a compact solid interface film which is not easy to be adhered by wheels, and meanwhile, the protection effect on liquid drops in the system is stronger, so that the stability is more outstanding, and the high temperature is combinedThe high-latex asphalt with excellent performance can make up the problems of higher cost and insufficient storage stability of the current non-sticky emulsified asphalt while realizing the non-sticky effect. The non-sticky wheel emulsified asphalt provided by the invention has the storage stability of only 0.2% in 1d and only 0.8% in 5 d; and the adhesive layer has no granular feel even if the adhesive layer is adhered at 60 ℃ and stored at-5 ℃ and has good stability, and can meet the severe storage requirement of severe natural environment in remote areas on the adhesive layer.
The preparation method provided by the invention has the advantages of simple and continuous process and high degree of mechanization, and the obtained non-sticky emulsified asphalt has uniform components and uniform distribution, can be kept stable for a long time in the storage process, and is suitable for large-scale industrial production.
When the non-wheel-sticking emulsified asphalt provided by the invention is used as an asphalt pavement adhesive layer, the adhesive layer is not easy to be stuck on the wheels, so that the construction efficiency is improved, early diseases such as sliding, fatigue cracking or peeling are reduced, and the asphalt pavement performance is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a preparation flow chart provided in example 1;
fig. 2 is a preparation flow chart provided in comparative example 1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations.
The first aspect of the invention provides a non-sticky wheel emulsified asphalt, which comprises nano SiO 2 Emulsified asphalt and high latex asphalt.
In the non-sticky wheel emulsified asphalt provided by the invention, nano SiO 2 The surface of the emulsified asphalt liquid drop is uniformly embedded with a layer of solid nano SiO 2 The particles, the compact solid interface membrane formed is not easy to be adhered by wheels, and meanwhile, the protection effect on liquid drops in the system is stronger, so that the stability is more outstanding, and the problems of high manufacturing cost and insufficient storage stability of the current non-adhesive wheel emulsified asphalt are solved while the non-adhesive wheel effect is realized by combining the high-latex asphalt with excellent high-temperature performance. The non-sticky wheel emulsified asphalt provided by the invention has the storage stability of only 0.2% in 1d and only 0.8% in 5 d; and the adhesive layer has no granular feel even if the adhesive layer is adhered at 60 ℃ and stored at-5 ℃ and has good stability, and can meet the severe storage requirement of severe natural environment in remote areas on the adhesive layer.
Further, nano SiO 2 The weight ratio of emulsified asphalt to high latex asphalt is 0.8-1.2:0.8-1.2, preferably 1:1.
When nano SiO 2 When the weight ratio of the emulsified asphalt to the high-latex asphalt is less than 0.8:1.2, the effect of preventing sticking wheels at high temperature is poor; when nano SiO 2 When the weight ratio of emulsified asphalt to high-latex asphalt is higher than 1.2:0.8, the thermal stability of the material is insufficient. In some embodiments of the invention, nano SiO 2 The weight ratio of emulsified asphalt to high latex asphalt is typically, but not limited to, 0.8:0.8, 0.8:1, 0.8:1.2, 1.2:0.8, or 1.2:1.
Preferably, the solid content of the evaporation residue of the high-latex asphalt is more than or equal to 50%, the softening point is more than or equal to 80 ℃, the dynamic viscosity at 60 ℃ is more than or equal to 20000Pa.s, and the high-latex asphalt meeting the conditions has excellent high-temperature stability and permanent denaturation resistance.
Preferably, the nano SiO 2 The solid content of the emulsified asphalt is 50-60%, and the spreading amount is 0.4kg/m 2 -0.6kg/m 2 。
Further, the nano SiO 2 The emulsified asphalt comprisesNano SiO 2 Emulsifying agents and matrix asphalt.
Preferably, the grade of the matrix asphalt includes at least one of # 50, # 70 and # 90.
Preferably, the nano SiO 2 The emulsifier is arranged on the nano SiO 2 The mass ratio of the emulsified asphalt is 50-60%.
The nano SiO 2 In emulsified asphalt, nano SiO 2 When the mass ratio of the emulsifier is lower than 50%, the index requirement of the relevant specification on the solid content of the emulsified asphalt of the adhesive layer is not met; nano SiO 2 When the mass ratio of the emulsifier is higher than 60%, the emulsifier is excessive, and the excessive emulsifier exists in the emulsified asphalt, so that the material waste is caused. In some embodiments of the invention, nano SiO 2 The mass fraction of emulsifier is typically, but not limited to, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59% or 60%.
Preferably, the matrix asphalt is on the nano SiO 2 The mass ratio of the emulsified asphalt is 40-50%.
Preferably, the nano SiO 2 The pH of the emulsifier is 2-3.
When nano SiO 2 When the pH of the emulsifier is lower than 2, the emulsifying effect is poor; when nano SiO 2 When the pH of the emulsifier is higher than 3, the emulsified asphalt after emulsification is insufficient in stability and easy to break. In some embodiments of the invention, nano SiO 2 The pH of the emulsifier is typically, but not limited to, 2, 2.2, 2.4, 2.6, 2.8 or 3.
Further, according to parts by weight, the nano SiO 2 The emulsifier comprises 85-90 parts of alkaline silica sol solution, 0.6-0.7 part of surface modifier and 11.3-14.4 parts of sodium chloride.
The nano SiO 2 The function of adding sodium chloride into the emulsifier is to make the emulsion system more stable.
In some embodiments of the invention, the nano SiO 2 In the emulsifier, the weight parts of the alkaline silica sol solution are typically, but not limited to, 85 parts, 86 parts, 87 parts, 88 parts, 89 parts or 90 parts; weight of surface modifierThe parts by weight are typically but not limited to 0.6 parts, 0.65 parts or 0.7 parts; the parts by weight of sodium chloride are typically, but not limited to 11.3 parts, 12 parts, 13 parts, 14 parts or 14.4 parts.
In an emulsion system, pickering emulsion can greatly improve the stability of the emulsion by adopting a dispersion stabilization mechanism of stabilizing the emulsion by solid particles. Unlike conventional emulsified asphalt in which interfacial tension is reduced by a surfactant, asphalt is emulsified based on a Pickering emulsion mechanism, and a particle protection film is formed by using solid particles, so that the stability of emulsion can be greatly improved.
The invention is based on Pickering emulsion mechanism, and nano SiO after surface modification 2 The particles are used as emulsifying agent to emulsify matrix asphalt and prepare nano SiO 2 Emulsifying asphalt to fully exert nano SiO 2 The advantages of the performance in the aspect of thermal stability are combined with high-latex asphalt with excellent high-temperature performance and nano SiO 2 The emulsified asphalt is compounded to solve the defects of storage stability and non-adhesive wheel performance of the current adhesive layer material.
Preferably, the surface modifying agent comprises adipic acid mono-acyl diethanolamine.
Preferably, the alkaline silica sol solution comprises nano SiO 2 The nano SiO 2 The average grain diameter of the nano SiO is 28nm-40nm 2 The mass content of (2) is 4.5% -5.5%.
Based on the material cost, the selected nano SiO 2 The particles have the advantages of low cost, good thermal stability and easy acquisition, and the modified nano SiO is used 2 The emulsifier is used for emulsifying the asphalt, and simultaneously has the function of the modifier, so that the dual purposes of emulsification and modification are achieved, and the nano emulsified asphalt with better storage stability can be prepared. Nanometer emulsified asphalt based on Pickering emulsion, and a layer of solid nanometer SiO is uniformly embedded on the surface of liquid drop of nanometer emulsified asphalt 2 The particle, the compact solid interface film formed, has stronger protection effect on liquid drops, thus the stability performance is more outstanding, and the high latex asphalt with excellent high temperature performance is combined, so that the current non-sticking effect is realized, and meanwhile, the current non-sticking effect is made upThe cost of the sticky wheel emulsified asphalt is high, and the storage stability is insufficient.
Preferably, the pH of the alkaline silica sol solution is 9-10, the viscosity is 2 Pa.s-2.5 Pa.s, and the density is 1.1g/cm 2 -1.3g/cm 2 。
The second aspect of the invention provides a preparation method of the non-sticky wheel emulsified asphalt, which comprises the steps of mixing the nano SiO 2 Placing the emulsified asphalt on dispersing equipment, preserving heat at 50-60 ℃, and adding the high-latex asphalt for uniform dispersion to obtain the non-sticky wheel emulsified asphalt.
The preparation method provided by the invention has the advantages of simple and continuous process and high degree of mechanization, and the obtained non-sticky emulsified asphalt has uniform components and uniform distribution, can be kept stable for a long time in the storage process, and is suitable for large-scale industrial production.
Further, the dispersing apparatus comprises a high speed shear.
Preferably, the dispersing speed is 2000r/min to 2500r/min.
Further, the nano SiO 2 The preparation method of the emulsified asphalt comprises the following steps:
A. adding a surfactant into an alkaline silica sol solution, adding acid to adjust pH, and finally adding sodium chloride to obtain the nano SiO 2 An emulsifying agent;
B. at the nano SiO 2 Adding matrix asphalt into the emulsifier, and uniformly dispersing to obtain the nano SiO 2 Emulsified asphalt.
Further, the temperature of the alkaline silica sol solution is 50-70 ℃. In some embodiments of the present invention, the alkaline silica sol solution is heated, typically but not limited to, at a temperature of 50 ℃, 55 ℃, 60 ℃, 65 ℃, or 70 ℃.
Preferably, in step B, the nano SiO 2 The temperature of the emulsifier is 70-90 ℃. In some embodiments of the invention, the nano SiO is mixed with the matrix pitch before 2 The emulsifier is heated, typically but not limited to 70 ℃, 75 ℃, 80 ℃, 85 ℃ or 90 ℃.
Preferably, in step B, the temperature of the matrix asphalt is 140 ℃ to 150 ℃.
In some embodiments of the present invention, the matrix asphalt is heated, typically but not limited to 140 ℃, 145 ℃ or 150 ℃.
Further, the dispersing speed is 3000r/min-4000r/min.
In some embodiments of the present invention, a method of preparing non-stick emulsified asphalt comprises the steps of:
1. adding a surfactant into an alkaline silica sol solution, adding acid to adjust pH, and finally adding sodium chloride to obtain the nano SiO 2 An emulsifying agent;
2. at the nano SiO 2 Adding matrix asphalt into the emulsifier, and uniformly dispersing to obtain the nano SiO 2 Emulsified asphalt;
3. the nano SiO is processed by 2 Placing the emulsified asphalt on dispersing equipment, preserving heat at 50-60 ℃, and adding the high-latex asphalt for uniform dispersion to obtain the non-sticky wheel emulsified asphalt.
The invention firstly prepares nano SiO by alkaline silica sol solution and surface modifier 2 An emulsifying agent; then, based on Pickering emulsion system, the matrix asphalt is treated with nano SiO through a dispersing device 2 Emulsifying the emulsifier to obtain the nano SiO with excellent storage stability 2 Emulsified asphalt; next, nano SiO was used 2 The emulsified asphalt and the high-latex asphalt are compounded to obtain the non-sticky wheel nano emulsified asphalt. The wheel-sticking-free emulsified asphalt prepared by the invention has more excellent storage stability and lower manufacturing cost while realizing the wheel-sticking-free performance, and can be used for meeting the severe technical requirements of more complex highway construction environments on the adhesive layer.
The third aspect of the invention provides the application of the wheel-free emulsified asphalt in an asphalt pavement adhesive layer.
When the non-wheel-sticking emulsified asphalt provided by the invention is used as an asphalt pavement adhesive layer, the adhesive layer is not easy to be stuck on the wheels, so that the construction efficiency is improved, early diseases such as sliding, fatigue cracking or peeling are reduced, and the asphalt pavement performance is ensured.
Some embodiments of the present invention will be described in detail below with reference to examples. The following embodiments and features of the embodiments may be combined with each other without conflict. The raw materials used in the present invention are commercially available unless otherwise specified.
The alkaline silica sol solutions used in the following examples and comparative examples were purchased from Shandong Yousu chemical technology Co., ltd, under the brand name JN-40; the high-gel modified emulsified asphalt is purchased from Hongsun engineering materials science and technology Co.
Example 1
The embodiment provides non-sticky wheel emulsified asphalt, as shown in fig. 1, specifically comprising the following steps:
1. preparation of nano SiO 2 Emulsifying agent: adding 0.6g of adipic acid mono-acyl diethanolamine surface modifier into 90g of alkaline silica sol solution (pH 9) at 50 ℃ and fully stirring, then adding hydrochloric acid to adjust the pH of the solution to 2.5 and adding 14.4g of sodium chloride to obtain uniformly distributed nano SiO 2 An emulsifying agent.
2. Preparation of nano SiO 2 Emulsified asphalt: 100g of nano SiO 2 The emulsifier is kept at 80 ℃ and the 70# matrix asphalt is placed in a baking oven at 150 ℃ to be kept at a sufficient flowing state, and 100g of nano SiO is contained 2 The beaker of emulsifier was placed on the heated stage of the high speed shear, the speed of the high speed shear was turned on to maintain 3000r/min, 100g of 70# base asphalt in a flowing state was slowly added thereto, and the high speed shear was maintained for a continued shear for 30 seconds.
3. Preparing non-sticky wheel emulsified asphalt: 200g of prepared nano SiO 2 Placing the emulsified asphalt on a heating table of a high-speed shearing machine to keep the temperature at 60 ℃, opening the high-speed shearing machine to keep the rotating speed at 2500r/min, adding 200g of high-latex asphalt according to the ratio of 1:1, and continuously keeping the high-speed shearing machine to shear for 2 minutes to obtain the uniformly-dispersed 400g of non-sticky wheel nano emulsified asphalt.
Example 2
The embodiment provides non-sticky wheel emulsified asphalt, which specifically comprises the following steps:
1. manufacturing processPreparation of nano SiO 2 Emulsifying agent: adding 0.6g of surface modifier into 85g of alkaline silica sol solution (pH 9) at 50 ℃ and fully stirring, then adding hydrochloric acid to adjust the pH of the solution to 2.5, and adding 14.4g of sodium chloride to obtain uniformly distributed nano SiO 2 An emulsifying agent.
Step 2 and step 3 are the same as in example 1.
Example 3
The embodiment provides non-sticky wheel emulsified asphalt, which specifically comprises the following steps:
1. preparation of nano SiO 2 Emulsifying agent: adding 0.7g of surface modifier into 85g of alkaline silica sol solution (pH 9) at 50 ℃ and fully stirring, then adding hydrochloric acid to adjust the pH of the solution to 2.5, and adding 14.4g of sodium chloride to obtain uniformly distributed nano SiO 2 An emulsifying agent.
Example 4
The embodiment provides non-sticky wheel emulsified asphalt, which specifically comprises the following steps:
1. step 1 is the same as in example 1.
2. Preparation of nano SiO 2 Emulsified asphalt: 100g of nano SiO 2 The emulsifier is kept at 80 ℃ and the 70# matrix asphalt is placed in a baking oven at 150 ℃ to be kept at a sufficient flowing state, and 100g of nano SiO is contained 2 The beaker of emulsifier was placed on the heated stage of the high speed shear, the high speed shear was turned on at 3000r/min, 65g of 70# matrix asphalt in a flowing state was slowly added thereto, and the high speed shear was maintained for a continued shear for 30 seconds.
3. Step 3 is the same as in example 1.
Example 5
The embodiment provides non-sticky wheel emulsified asphalt, which specifically comprises the following steps:
1. step 1 is the same as in example 1.
2. Step 2 is the same as in example 1.
3. Preparing non-sticky wheel emulsified asphalt: 200g of prepared nano SiO 2 Placing the emulsified asphalt on a heating table of a high-speed shearing machine, preserving heat at 60 ℃, opening the rotating speed of the high-speed shearing machine to keep 2500r/min, and adding 300g of high-gel emulsified asphalt according to the ratio of 1:1And (3) continuously maintaining the shearing of the high-speed shearing machine for 2 minutes to obtain 500g of non-sticky wheel nano emulsified asphalt which is uniformly dispersed.
Example 6
The embodiment provides non-sticky wheel emulsified asphalt, which specifically comprises the following steps:
1. step 1 is the same as in example 1.
2. Step 2 is the same as in example 1.
3. Preparing non-sticky wheel emulsified asphalt: 200g of prepared nano SiO 2 Placing the emulsified asphalt on a heating table of a high-speed shearing machine to keep the temperature at 60 ℃, opening the high-speed shearing machine to keep the rotating speed at 2500r/min, adding 133g of high-latex asphalt according to the ratio of 1:1, and continuously keeping the high-speed shearing machine to shear for 2 minutes to obtain 333g of non-sticking wheel nano emulsified asphalt which is uniformly dispersed.
Comparative example 1
This comparative example provides an emulsified asphalt, as shown in fig. 2, specifically comprising the steps of:
1. 100g of SBS modified asphalt (grade S-D of Jinling petrochemical industry) heated to a flowing state and 100g of 30# hard petroleum asphalt are mixed according to the proportion, so that 200g of compound low-grade SBS modified asphalt is prepared.
2. Adding 20g of emulsifier Acomapc-10 into 180g of warm water at 60 ℃, fully stirring, dissolving, uniformly mixing, adjusting the pH value to 2 by hydrochloric acid, and preserving heat for later use.
3. And (2) heating 200g of the compound low-grade SBS modified asphalt to 160 ℃, and adding the emulsifier solution obtained in the step (2) into a colloid mill according to a ratio of 1:1 for emulsification to finally obtain 400g of emulsified asphalt.
Comparative example 2
This comparative example provides a nano SiO 2 The emulsified asphalt specifically comprises the following steps:
1. preparation of nano SiO 2 Emulsifying agent: adding 0.6g of surface modifier into 90g of alkaline silica sol solution (pH 9) at 50 ℃ and fully stirring, then adding hydrochloric acid to adjust the pH of the solution to 2.5, and adding 14.4g of sodium chloride to obtain uniformly distributed nano SiO 2 An emulsifying agent.
2. Preparation of nano SiO 2 Emulsified asphalt: will be 100g nano SiO 2 The emulsifier is kept at 80 ℃ and the 70# matrix asphalt is placed in a baking oven at 150 ℃ to be kept at a sufficient flowing state, and 100g of nano SiO is contained 2 Placing a beaker of the emulsifier on a heating table of a high-speed shearing machine, opening the high-speed shearing machine, keeping the rotating speed of the high-speed shearing machine at 3000r/min, slowly adding 100g of 70# matrix asphalt in a flowing state into the beaker, and keeping the high-speed shearing machine to continuously shear for 30 seconds to obtain nano SiO 2 Emulsified asphalt.
Comparative example 3
The comparative example provides an emulsified asphalt, which specifically comprises the following steps:
1. preparation of nano SiO 2 Emulsifying agent: adding 0.6g of surface modifier into 90g of alkaline silica sol solution (pH 9) at 50 ℃ and fully stirring, then adding hydrochloric acid to adjust the pH of the solution to 2.5, and adding 14.4g of sodium chloride to obtain uniformly distributed nano SiO 2 An emulsifying agent.
2. Preparing emulsified asphalt: 100g of nano SiO is taken 2 The emulsifier is placed on a heating table of a high-speed shearing machine to keep the temperature at 60 ℃, the rotating speed of the high-speed shearing machine is opened to keep 2500r/min, 100g of high-latex asphalt is added according to the proportion of 1:1, and the high-speed shearing machine is continuously kept for shearing for 2 minutes, so that 200g of emulsified asphalt which is uniformly dispersed is obtained.
Test examples
The emulsified asphalt obtained in examples 1 to 6 and comparative examples 1 to 3 was subjected to the road performance test according to the "Highway asphalt pavement construction Specification" (JTG F40-2004), and the results are shown in tables 1 and 2 below.
TABLE 1
TABLE 2
As can be seen from tables 1 and 2: the non-stick wheel emulsified asphalt provided in examples 1-6 was 1.7-10.8 ℃ higher than example 1 in softening point index, and found by the 60 ℃ dynamic viscosity index: examples 1-6 are all more excellent than example 1, indicating that the non-stick-to-wheel emulsified asphalt has excellent high temperature stability; in terms of low temperature stability, the six nano-emulsified asphalt passing through examples 1-6 have no coarse particles or a few coarse particles, which indicates that the low temperature stability of the interfacial film formed by the nano-particles is superior to that of the interfacial film formed by using a common surfactant as an emulsifier, and the storage stability of the nano-emulsified asphalt passing through examples 1-6 is more excellent.
The non-sticky wheel emulsified asphalt provided in examples 1-6 does not flow and slip in the test temperature range of 140-160 ℃, which fully shows the advantages of the nano emulsified asphalt in terms of high-temperature anti-flowing performance, high-glue modified asphalt with excellent high-temperature stability and nano SiO 2 The particles complement each other and together ensure the excellent data of the heat resistance test of the nano emulsified asphalt, which shows that the nano emulsified asphalt can fully resist the paving temperature of the asphalt mixture without flowing and sliding, and is the foundation for fully ensuring the excellent performance of non-sticking wheels as a bonding layer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The non-sticking emulsified asphalt is characterized by comprising nano SiO 2 Emulsified asphalt and high latex asphalt.
2. The device of claim 1The adhesive wheel emulsified asphalt is characterized in that the adhesive wheel emulsified asphalt is prepared from nano SiO 2 The weight ratio of emulsified asphalt to high latex asphalt is 0.8-1.2:0.8-1.2, preferably 1:1;
preferably, the solid content of the evaporation residue of the high-latex asphalt is more than or equal to 50%, the softening point is more than or equal to 80 ℃, and the dynamic viscosity at 60 ℃ is more than or equal to 20000Pa.s;
preferably, the nano SiO 2 The solid content of the emulsified asphalt is 50-60%, and the spreading amount is 0.4kg/m 2 -0.6kg/m 2 。
3. The non-stick emulsified asphalt as set forth in claim 1, wherein the nano SiO 2 The emulsified asphalt comprises nano SiO 2 Emulsifying agent and matrix asphalt;
preferably, the brand of the matrix asphalt comprises at least one of 50#, 70# and 90 #;
preferably, the nano SiO 2 The emulsifier is arranged on the nano SiO 2 The mass ratio of the emulsified asphalt is 50-60%;
preferably, the matrix asphalt is on the nano SiO 2 The mass ratio of the emulsified asphalt is 40-50%;
preferably, the nano SiO 2 The pH of the emulsifier is 2-3.
4. The wheel-free emulsified asphalt as set forth in claim 3, wherein the nano-SiO is prepared by the following steps in parts by weight 2 The emulsifier comprises 85-90 parts of alkaline silica sol solution, 0.6-0.7 part of surface modifier and 11.3-14.4 parts of sodium chloride;
preferably, the surface modifier comprises adipic acid mono-acyl diethanolamine;
preferably, the alkaline silica sol solution comprises nano SiO 2 The nano SiO 2 The average grain diameter of the nano SiO is 28nm-40nm 2 The mass content of (2) is 4.5% -5.5%;
preferably, the pH of the alkaline silica sol solution is 9-10, the viscosity is 2 Pa.s-2.5 Pa.s, and the density is 1.1g/cm 2 -1.3g/cm 2 。
5. The method for preparing wheel-less emulsified asphalt according to any one of claims 1 to 4, wherein the nano SiO 2 Placing the emulsified asphalt on dispersing equipment, preserving heat at 50-60 ℃, and adding the high-latex asphalt for uniform dispersion to obtain the non-sticky wheel emulsified asphalt.
6. The method of manufacturing according to claim 5, wherein the dispersing apparatus comprises a high-speed shear;
preferably, the dispersing speed is 2000r/min to 2500r/min.
7. The method of claim 5, wherein the nano-SiO 2 The preparation method of the emulsified asphalt comprises the following steps:
A. adding a surfactant into the alkaline silica sol solution, adding acid to adjust the pH value, and finally adding sodium chloride to obtain the nano SiO 2 An emulsifying agent;
B. at the nano SiO 2 Adding matrix asphalt into the emulsifier, and uniformly dispersing to obtain the nano SiO 2 Emulsified asphalt.
8. The method of claim 7, wherein the alkaline silica sol solution has a temperature of 50 ℃ to 70 ℃;
preferably, in step B, the nano SiO 2 The temperature of the emulsifier is 70-90 ℃;
preferably, in step B, the temperature of the matrix asphalt is 140 ℃ to 150 ℃.
9. The method according to claim 7, wherein the dispersing speed is 3000r/min to 4000r/min.
10. Use of the wheel-tack-free emulsified asphalt of any one of claims 1-4 in an asphalt pavement binding layer.
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