CN112724696A - Beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and preparation method thereof - Google Patents
Beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and preparation method thereof Download PDFInfo
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Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and a preparation method thereof, belonging to the technical field of building materials. The method comprises the following steps: uniformly dispersing the beta-cyclodextrin solution into the styrene-butadiene-styrene triblock copolymer modified asphalt to obtain a mixture, and performing shearing treatment and development treatment on the obtained mixture to obtain the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt. The preparation method of the invention can be processed on the basis of the original processing technology, is safe to operate and is suitable for expanding production and popularization. The performance advantages of the styrene-butadiene-styrene triblock copolymer and the beta-cyclodextrin are combined, so that the prepared beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt has the characteristics of good high-temperature stability and low-temperature anti-cracking capability, excellent storage stability and outstanding thermal-oxidative-aging resistance.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and a preparation method thereof.
Background
The asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, and the asphalt can be mainly divided into coal tar asphalt, petroleum asphalt and natural asphalt. The asphalt which is not modified is called as matrix asphalt, and the matrix asphalt is often poor in high-temperature stability and anti-rutting performance and easy to crack in a low-temperature environment, so that the matrix asphalt needs to be modified and then used in road engineering. Polymer (polyethylene, polypropylene, polystyrene-butadiene copolymer, ethylene-vinyl acetate copolymer and the like) modified asphalt is used as important modified asphalt and is widely applied to the fields of road engineering and waterproof engineering, and meanwhile, the modified asphalt is also an important raw material for producing high-performance carbon materials.
Styrene-butadiene-styrene block copolymer (SBS) is a thermoplastic elastomer with the highest world yield and the most similar performance to rubber, and SBS modified asphalt is used as an indispensable 'adhesive' in road engineering and is modified asphalt with the largest consumption in the current road engineering. The polystyrene segment in SBS has high elasticity and fatigue resistance of vulcanized rubber, and the polybutadiene segment provides processability of resin, so SBS can improve high and low temperature performance and temperature sensitivity of asphalt.
In recent years, cyclodextrin is widely applied to the fields of molecular recognition, medicine, sewage treatment and the like due to the unique 'external hydrophilic and internal hydrophobic' structure. Cyclodextrins are classified into alpha-cyclodextrin (alpha-CD), beta-cyclodextrin (beta-CD) and gamma-cyclodextrin (gamma-CD) according to the number of glucose molecules constituting the cyclodextrin. The inclusion compound prepared by adopting a proper method can improve certain properties of the object because the cyclodextrin can be included with various objects, and some object molecules can form hydrogen bonds with hydroxyl groups of the cyclodextrin, so that the stability of the inclusion compound is improved.
Relevant researches show that the SBS modified asphalt still has the phenomenon of unstable performance in the using process, for example, SBS can absorb light components in the asphalt and form a three-dimensional network structure, so that the performance of the modified asphalt is improved, but the structure can be degraded after being irradiated by ultraviolet light, and the three-dimensional network is destroyed. In addition, the SBS modified asphalt can not avoid thermal oxidation aging in the processing and transportation processes, and the thermal oxidation aging accelerates the volatilization of light components in the asphalt, thereby reducing the storage stability and physical properties of the modified asphalt.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and the preparation method thereof, so as to achieve the purpose of improving the ageing resistance and the storage stability of the matrix asphalt.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a preparation method of beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt, which comprises the following steps:
preparing styrene-butadiene-styrene triblock copolymer modified asphalt by using styrene-butadiene-styrene triblock copolymer and matrix asphalt, and preparing beta-cyclodextrin solution by using beta-cyclodextrin;
and uniformly dispersing the obtained beta-cyclodextrin solution into the obtained styrene-butadiene-styrene triblock copolymer modified asphalt to obtain a mixture, and shearing and developing the obtained mixture to obtain the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt.
Preferably, the beta-cyclodextrin solution is obtained by uniformly dispersing beta-cyclodextrin in N, N-dimethylformamide; wherein the mass ratio of the beta-cyclodextrin to the N, N-dimethylformamide is 1: 3.
Preferably, the mass ratio of the beta-cyclodextrin to the matrix asphalt is 1-5: 100.
Preferably, the development temperature is 165-170 ℃, and the development time is 60-70 min.
Preferably, the shearing time is 50-60min, the shearing temperature is 155-165 ℃, and the shearing rate is 3500-4500 rpm.
Preferably, the styrene-butadiene-styrene triblock copolymer is mixed with the matrix asphalt and then subjected to high-speed shearing and dispersing treatment to prepare the styrene-butadiene-styrene triblock copolymer modified asphalt.
Further preferably, the mass ratio of the styrene-butadiene-styrene triblock copolymer to the matrix asphalt is 3-5: 100.
Further preferably, the high shear dispersion treatment comprises: heating the matrix asphalt to 155-165 ℃ to obtain molten asphalt, carrying out high-speed shearing treatment at 3500-4500 rpm on the obtained molten asphalt, and continuously adding the styrene-butadiene-styrene triblock copolymer for shearing and dispersing when the high-speed shearing is carried out for 5-10 min.
The invention also discloses beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt prepared by the preparation method.
Preferably, the difference between the upper softening point and the lower softening point of the storage stability of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt is 2.1-56.0 ℃.
Preferably, the complex modulus change range of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt before and after thermal oxidation aging can reach 4.8% -17.1%.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a preparation method of beta-cyclodextrin (beta-CD)/styrene-butadiene-styrene triblock copolymer (SBS) modified asphalt, wherein in the preparation method, a biological material beta-CD is introduced into the SBS modified asphalt. The bio-based material mainly comprises vegetable oil or natural polymer materials, and the special structure of the nano bio-based material is rarely concerned, and the characteristic of the structure is utilized to modify the asphalt. The invention designs the modified asphalt aiming at the special structural characteristics of 'external hydrophilicity and internal hydrophobicity' of the beta-CD for the first time, and the beta-CD can be uniformly and effectively dispersed into the SBS modified asphalt by utilizing the method for preparing the beta-CD solution. The beta-CD has a round platform type cavity structure, and can wrap a part of substances with the volume smaller than that of the cavity in the cavity to form inclusion action. In addition, the solvent carrier in the beta-CD solution can be removed through development treatment, SBS is fully developed, and finally the beta-CD/SBS modified asphalt is prepared. The preparation method of the beta-CD/SBS modified asphalt can be directly processed on the original SBS modified asphalt production equipment, has the advantages of simple process and low cost, and is suitable for expanded production and popularization.
Furthermore, the dosage of the beta-CD modifier can be adjusted according to actual needs, so that the anti-aging performance of the obtained beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt can be regulated and controlled.
The invention also discloses beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt prepared by the preparation method, wherein beta-CD is added into SBS modified asphalt, the inclusion effect of the beta-CD is utilized to limit the movement of SBS molecular chains in the asphalt aging process, and the volatilization of light components in the matrix asphalt is slowed down, so that the aim of improving the asphalt aging resistance is fulfilled. Therefore, the invention combines the characteristics of the SBS and the beta-CD modifier, and the prepared beta-CD/SBS modified asphalt has the characteristics of better high-temperature stability, better low-temperature anti-cracking capability, excellent storage stability and outstanding thermal-oxidative aging resistance.
Furthermore, relevant detection shows that the softening point temperature of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt is 34.0-66.7 ℃, and the difference between the upper softening point and the lower softening point of the storage stability can reach 2.1-56.0 ℃; compared with the traditional styrene-butadiene-styrene triblock copolymer modified asphalt without adding beta-cyclodextrin, the complex modulus change range after thermal oxidation aging is obviously reduced. Therefore, the anti-aging effect and the storage stability of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt are obviously enhanced.
Drawings
FIG. 1 is a fluorescent microscope photograph of SBS modified asphalt prepared in example 1 of the present invention;
FIG. 2 is the difference between the upper and lower softening points of the segregation test of the beta-CD/SBS modified asphalt with different beta-CD addition amounts in the invention;
FIG. 3 is a graph of the rheological properties of SBS modified asphalt and β -CD/SBS modified asphalt of example 3 of the present invention before and after aging;
FIG. 4 is a fluorescence microscope image of the segregation experiment of the beta-CD/SBS modified asphalt prepared in example 4 of the present invention;
FIG. 5 is a thermogravimetric analysis chart of the β -CD/SBS modified asphalt prepared in example 5 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention uses a high-speed shearing machine to prefabricate SBS modified asphalt, then uses N, N-dimethyl formamide (DMF) as a carrier, disperses beta-CD into SBS modified asphalt evenly, then removes DMF in a constant temperature oven and makes SBS develop fully, finally prepares beta-CD/SBS modified asphalt.
The invention provides a preparation method of beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer (beta-CD/SBS) modified asphalt, which is implemented by the following steps:
step 1, prefabricating styrene-butadiene-styrene triblock copolymer (SBS) modified asphalt:
the asphalt-base asphalt comprises 12-20 g of SBS and 300-500 g of base asphalt, wherein the SBS and the base asphalt are weighed according to the mass ratio of 3-5: 100. Melting the matrix asphalt in a beaker by using a well type sand bath heating furnace, keeping the temperature at 155-165 ℃, immersing a high-speed shearing machine into the molten matrix asphalt, opening the shearing machine to shear at a shearing speed of 3500-4500 rpm, and then adding the SBS modifier within 5-10 min after the shearing begins to form the prefabricated SBS modified asphalt.
according to the following steps: 3 (3-25 g) and DMF (9-75 g), and the beta-CD is accelerated to dissolve in the DMF by water bath, the heating temperature is 75-80 ℃, and when the beta-CD is completely dissolved in the DMF solution, the beta-CD/DMF solution is prepared.
Step 3, preparing the beta-CD/SBS modified asphalt:
and (3) adding the beta-CD/DMF solution obtained in the step (2) into the prefabricated SBS modified asphalt obtained in the step (1), and shearing and developing to prepare the beta-CD/SBS modified asphalt.
In the step 3, the shearing time is 50-60min, the shearing temperature is 155-165 ℃, and the shearing rate is 3500-4500 rpm.
And 3, in the step 3, the development time is 60-70 min in an oven, the development temperature is 170-175 ℃, and DMF is ensured to be completely volatilized under the condition, so that the beta-CD/SBS modified asphalt is obtained.
Wherein the mass ratio of the beta-CD modifier to the matrix asphalt is 1-5: 100.
The invention selects SBS and beta-CD as modifier, DMF as carrier, to prepare beta-CD/SBS modified asphalt. The SBS modified asphalt is used as the polymer modified asphalt with the largest using amount, the processing technology is mature, the production cost is low, the anti-rutting performance is better, and the high-temperature and low-temperature performance is stable; beta-CD as a biological material is widely applied to the fields of environmental management and medicine, and meanwhile, due to the fact that the special 'external hydrophilic and internal hydrophobic' structure can play a role in inclusion, the production cost is low, and the beta-CD can be widely used in the engineering neighborhood. After the characteristics of the SBS and the beta-CD are combined, the beta-CD/SBS modified asphalt has better ageing resistance and storage stability, and can be produced on a large scale on the basis of the original production conditions and processes.
The invention is described in further detail below with reference to specific embodiments and the attached drawing figures:
example 1
Mixing 300g of 90#Melting the matrix asphalt in a 500mL beaker, putting the beaker into a well type sand bath heating furnace, with the processing temperature of 155 ℃, immersing a shearing machine into the matrix asphalt, adjusting the rotation speed to 3500rpm, weighing 12g of SBS, adding the SBS into the matrix asphalt, shearing and dispersing, and adding the SBS for 5 min.
Weighing 3g of beta-CD, pouring the beta-CD into a beaker containing 9g of DMF, heating the mixed solution in a water bath at 75 ℃ and continuously stirring, pouring the mixed solution into prefabricated SBS modified asphalt when no solid matter exists in the mixed solution, and shearing for 50min by using a high-speed shearing machine, wherein the shearing speed is 3500rpm, and the shearing temperature is 155 ℃. And (3) taking out the shearing machine after shearing is finished, and putting the modified asphalt into an oven at 170 ℃ for development for 60min to obtain the beta-CD/SBS modified asphalt.
The microscopic morphology of the beta-CD/SBS modified asphalt obtained in example 1 is observed and analyzed by a fluorescence microscope, and the fluorescence microscope photo is shown in figure 1, so that the SBS can be observed to be uniformly distributed in the matrix asphalt, the diameter of SBS particles is basically less than 20 μm, and no obvious agglomeration phenomenon exists, therefore, the modifier can be illustrated to be uniformly dispersed in the asphalt, the physical properties of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt provided by the invention in the using process are ensured to be stable, the modified asphalt meets the using conditions of road engineering or waterproof engineering, and at the moment, the beta-CD/SBS modified asphalt prepared by the invention has high temperature stability (the highest softening point is 66.7 ℃ according to the test of ASTM D36).
Example 2
400g of 90#Melting the matrix asphalt in a 500mL beaker, putting the beaker into a well type sand bath heating furnace, processing at 160 ℃, immersing a shearing machine into the matrix asphalt, adjusting the rotation speed to 3750rpm, weighing 16g of SBS, adding the SBS into the matrix asphalt, shearing and dispersing, wherein the adding time is 7 min.
Weighing 12g of beta-CD, pouring the beta-CD into a beaker containing 36g of DMF, heating the mixed solution in a water bath at 80 ℃ and continuously stirring, pouring the mixed solution into prefabricated SBS modified asphalt when no solid matter exists in the mixed solution, and shearing the mixed solution for 60min by using a high-speed shearing machine at the shearing speed of 3750rpm and the shearing temperature of 160 ℃. And (3) taking out the shearing machine after shearing is finished, and putting the modified asphalt into a 165 ℃ oven to develop for 60min to obtain the beta-CD/SBS modified asphalt.
At this time, the SBS modified asphalt with the addition of 3 wt% of β -CD obtained in example 2 was subjected to a thermal stability test, and the test results are shown in FIG. 2. After the asphalt is stored for 48 hours at 163 ℃, the difference between the upper softening point and the lower softening point of the modified asphalt is only 4.0 ℃ by calculation, and the difference is obvious compared with the difference (56 ℃) between the upper softening point and the lower softening point of the SBS modified asphalt without adding the beta-CD, which shows that the addition of the beta-CD produces obvious improvement effect on the thermal stability of the SBS modified asphalt.
Example 3
Melting 500g of 90# base asphalt in a 600mL beaker, putting the beaker into a well type sand bath heating furnace, processing at 165 ℃, immersing a shearing machine in the base asphalt, adjusting the rotating speed to 4000rpm, weighing 20g of SBS, adding the SBS into the base asphalt, shearing and dispersing, and adding for 10 min.
Weighing 25g of beta-CD, pouring the beta-CD into a beaker containing 75g of DMF, heating the mixed solution in a water bath at 80 ℃ and continuously stirring, pouring the mixed solution into prefabricated SBS modified asphalt when no solid matter exists in the mixed solution, and shearing the mixed solution for 55min by using a high-speed shearing machine at the shearing speed of 4000rpm and the shearing temperature of 165 ℃. And taking out the shearing machine after shearing is finished, and putting the modified asphalt into an oven at 170 ℃ for development for 70min to obtain the beta-CD/SBS modified asphalt.
The rheological property curve of the beta-CD/SBS modified asphalt obtained in example 3 is shown in FIG. 3, and the change of the complex modulus (G) at different temperatures before and after aging of different modified asphalt is mainly studied, and the higher the complex modulus is, the better the deformation resistance is. It can be seen from this that, primarily, the complex modulus of the beta-CD/SBS modified asphalt is the highest and the complex modulus of the base asphalt is the lowest for the base asphalt, SBS modified asphalt and beta-CD/SBS modified asphalt. The anti-deformation capability of the beta-CD/SBS modified asphalt is the best, and the anti-deformation capability of the SBS modified asphalt can be improved by adding the beta-CD. After short-term thermal-oxidative aging, the deformation resistance of the aged matrix asphalt is better than that of the aged SBS modified asphalt after the temperature exceeds 74 ℃. The result shows that SBS can not improve the deformation resistance of the asphalt in a high-temperature area, but beta-CD can improve the ageing resistance of SBS modified asphalt.
Example 4
Melting 500g of 90# base asphalt in a 600mL beaker, putting the beaker into a well type sand bath heating furnace, processing at 162 ℃, immersing a shearing machine in the base asphalt, adjusting the rotating speed to 4500rpm, weighing 25g of SBS, adding the SBS into the base asphalt, shearing and dispersing, and adding for 9 min.
Weighing 25g of beta-CD, pouring the beta-CD into a beaker filled with 75g of DMF, heating the mixed solution in a water bath at 77 ℃ and continuously stirring, pouring the mixed solution into prefabricated SBS modified asphalt when no solid matter exists in the mixed solution, and shearing for 58min by using a high-speed shearing machine, wherein the shearing speed is 4500rpm, and the shearing temperature is 163 ℃. And (4) taking out the shearing machine after shearing is finished, and putting the modified asphalt into an oven at 169 ℃ for development for 62min to obtain the beta-CD/SBS modified asphalt.
The isolation of the beta-CD/SBS modified asphalt obtained in example 4 at 163 ℃ for 48 hours is shown in FIG. 4, which is a fluorescent micrograph. It can be seen that the SBS modified asphalt added with 5 wt% of beta-CD has improved the agglomeration phenomenon of SBS and the distribution of the modifier in the upper and lower layers has no obvious difference after the thermal stability test. At this time, the invention of this example was superior in low temperature cracking resistance (as measured by ASTM D113, the maximum breaking length at 5 ℃ C. was 797 mm).
Example 5
400g of 90#The melting rate of the matrix asphalt is 500mLAnd (3) putting the beaker into a well type sand bath heating furnace, wherein the processing temperature is 158 ℃, immersing a shearing machine into the matrix asphalt, adjusting the rotation speed to 4200rpm, weighing 12g of SBS, adding the SBS into the matrix asphalt, shearing and dispersing, and adding the SBS for 8 min.
Weighing 12g of beta-CD, pouring the beta-CD into a beaker containing 36g of DMF, heating the mixed solution in a water bath at 78 ℃ and continuously stirring, pouring the mixed solution into prefabricated SBS modified asphalt when no solid matter exists in the mixed solution, and shearing the mixed solution for 52min by using a high-speed shearing machine, wherein the shearing speed is 4200rpm, and the shearing temperature is 158 ℃. And (3) taking out the shearing machine after shearing is finished, and putting the modified asphalt into a 166 ℃ drying oven to develop for 65min to obtain the beta-CD/SBS modified asphalt.
According to the thermogravimetric test, the thermal decomposition temperature of the beta-CD/SBS modified asphalt is 270 ℃, referring to FIG. 5, the beta-CD/SBS modified asphalt with the beta-CD addition amount of 3 wt% obtained in example 5 starts to thermally decompose at 270 ℃, the decomposition is fastest at 451 ℃, and stops at 503 ℃, and the residual substance is about 17% of the mass of the test sample. The beta-CD/SBS modified asphalt has good thermal stability and does not generate thermal decomposition in the normal processing process.
Specifically, in a specific embodiment of the present invention, performance tests were performed on the resulting beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt at different beta-cyclodextrin addition levels, including: the asphalt is characterized by comprising 1 wt% of beta-cyclodextrin, 2 wt% of beta-cyclodextrin, 3 wt% of beta-cyclodextrin, 4 wt% of beta-cyclodextrin and 5 wt% of beta-cyclodextrin, and the softening point temperature of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt is 34.0-66.7 ℃ when tested according to ASTM D36, and the minimum value of the difference between the upper softening point and the lower softening point of the storage stability is 2.1-56.0 ℃, as shown in figure 2. According to the dynamic shear rheological test, the complex modulus of the composite modified asphalt is improved by 2.97-4.69 times compared with the prior modified asphalt after the beta-cyclodextrin is added, and the complex modulus of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt after thermal oxidation aging is in the range of 4.8-17.1%, while the complex modulus of the traditional styrene-butadiene-styrene triblock copolymer modified asphalt is in the range of 5.0-68.4%, as shown in fig. 5, the anti-aging effect of the composite modified asphalt is obviously enhanced. When a certain proportion of beta-cyclodextrin is added, the thermal stability of the styrene-butadiene-styrene triblock copolymer modified asphalt is obviously improved (figure 5), and the complex modulus of the composite modified asphalt is obviously improved, so that the shear resistance of the modified asphalt can be judged to be enhanced (figure 3).
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt is characterized by comprising the following steps:
preparing styrene-butadiene-styrene triblock copolymer modified asphalt by using styrene-butadiene-styrene triblock copolymer and matrix asphalt, and preparing beta-cyclodextrin solution by using beta-cyclodextrin;
and uniformly dispersing the obtained beta-cyclodextrin solution into the obtained styrene-butadiene-styrene triblock copolymer modified asphalt to obtain a mixture, and shearing and developing the obtained mixture to obtain the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt.
2. The method for preparing the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 1, wherein the beta-cyclodextrin solution is obtained by uniformly dispersing beta-cyclodextrin in N, N-dimethylformamide;
wherein the mass ratio of the beta-cyclodextrin to the N, N-dimethylformamide is 1: 3.
3. The preparation method of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 1, wherein the mass ratio of the beta-cyclodextrin to the matrix asphalt is 1-5: 100.
4. The preparation method of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 1, wherein the development temperature is 165-170 ℃, and the development time is 60-70 min.
5. The preparation method of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 1, wherein the shearing time is 50-60min, the shearing temperature is 155-165 ℃, and the shearing speed is 3500-4500 rpm.
6. The method for preparing the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 1, wherein the styrene-butadiene-styrene triblock copolymer is mixed with matrix asphalt and subjected to high-speed shearing dispersion treatment to prepare the styrene-butadiene-styrene triblock copolymer modified asphalt.
7. The preparation method of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 6, wherein the mass ratio of the styrene-butadiene-styrene triblock copolymer to the matrix asphalt is 3-5: 100.
8. The method for preparing the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt according to claim 6, wherein the high-speed shearing dispersion treatment comprises the following steps: heating the matrix asphalt to 155-165 ℃ to obtain molten asphalt, carrying out high-speed shearing treatment at 3500-4500 rpm on the obtained molten asphalt, and continuously adding the styrene-butadiene-styrene triblock copolymer for shearing and dispersing when the high-speed shearing is carried out for 5-10 min.
9. The beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt prepared by the preparation method of any one of claims 1 to 8.
10. The beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt of claim 9, wherein the difference between the upper and lower softening points of the storage stability of the beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt is 2.1 to 56.0 ℃.
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