CN115926485A - Pavement self-repairing modified asphalt and preparation method and application thereof - Google Patents
Pavement self-repairing modified asphalt and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims description 20
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- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 39
- 239000011593 sulfur Substances 0.000 claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
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- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 claims description 6
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- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 6
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- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
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- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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- YNHJECZULSZAQK-UHFFFAOYSA-N tetraphenylporphyrin Chemical compound C1=CC(C(=C2C=CC(N2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3N2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 YNHJECZULSZAQK-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- Y02A30/60—Planning or developing urban green infrastructure
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses self-repairing modified asphalt which is mainly prepared from the following components in parts by weight: 75-85 parts of matrix asphalt, 8-11 parts of anion solution polymerized styrene-butadiene rubber elastomer, 5-10 parts of polysiloxane trithiocarbonate, 1-2 parts of leveling agent, 0.5-1.8 parts of photosensitizer and 0.3-0.5 part of active sulfur. Preferably, the base asphalt is one or a mixture of 90, 110, 150 and 200 asphalt. The leveling agent is selected from one or more of polyether modified polydimethylsiloxane, polyacrylate leveling agent, acrylic-epoxy polyester polymer, polysiloxane polyether copolymer, fluorine-containing modified acrylate leveling agent or polyacrylate. The pavement self-repairing modified asphalt provided by the invention can be applied to the fields of road traffic, road and bridge waterproofing, building waterproofing and the like and can realize sustainable automatic repairing.
Description
Technical Field
The invention relates to the technical field of modified asphalt, in particular to pavement self-repairing modified asphalt and a preparation method and application thereof.
Background
At present, most roads in China adopt asphalt concrete pavements. The asphalt pavement is a pavement structure with a surface layer made of asphalt mixture with a certain thickness paved on a flexible base layer and a semi-rigid base layer. Compared with a gravel road, the strength and the stability of the road are greatly improved. Compared with cement concrete road surface, the asphalt road surface has smooth surface without joint seam, small vibration, low noise, fast open traffic, simple maintenance, suitability for road surface construction in different periods, and is an important structural form of road surface in China. Asphalt concrete also has some disadvantages: the asphalt material has poor temperature stability, is easy to crack in winter and is easy to soften in summer; if the control is not good, the pavement is softened and oiled or the emulsified asphalt is damaged by moving and shearing. The asphalt material becomes brittle at low temperatures and may cause pavement cracking. The compacted mixture has large void ratio and poor water resistance, and is easy to generate water damage; particularly in northern areas or high latitude areas of China, the repair and maintenance of road diseases caused by asphalt cracking cost a large amount of funds.
In China, the economy develops rapidly in recent decades, the productivity and the production efficiency are both improved rapidly, and the logistics intensity and the frequency are both very high. Under the repeated action of load, the asphalt concrete pavement gradually generates fatigue cracking, if maintenance is not carried out in time, other secondary diseases such as net cracking, water damage, pot holes and the like are further caused, the strength and the rigidity of the asphalt concrete pavement are finally weakened, and the design service life of the asphalt concrete pavement is shortened. Common diseases of asphalt concrete: cracks, crazing web breaks, ruts, subsidence, pits, slurry turns, oil spill, loose, and the like. Asphalt as a glass substance with fluidity has certain repairing performance, so that part of diseases are: the diseases such as cracks, crazing net cracks, ruts, settlement and the like can be recovered theoretically through the self-repairing function of the asphalt. However, the self-repairing function of the asphalt as a glass body sensitive to temperature has a large relation with the temperature, the self-repairing speed of diseases generated in cold seasons is relatively slow, and accumulated small diseases can also become relatively large diseases in continuous use of pavements in continuous use. Therefore, the preparation and application of the asphalt self-repairing material are an important research direction and industrial requirements in the field of intelligent highway traffic.
At present, methods for enhancing the self-repairing performance of asphalt materials mainly comprise a microcapsule method, a temperature rise promotion method and a light repairing method. The microcapsule method has a good self-repairing rate, but still faces the key problems of high cost, high requirements on capsule performance and construction technology, single self-repairing function and the like. The self-repairing characteristic is the inherent attribute of the asphalt material, but because of the unique viscoelasticity and temperature sensitivity, the modified asphalt is added with the modifier, so that the viscosity of the modified asphalt is increased, the fluidity is poor, the self-repairing of the asphalt material is very slow under the low-temperature condition, the self-repairing usually needs higher temperature, a heating repairing method needs to add a conductive material into the asphalt and build an external electric field, the equipment investment is larger, the asphalt material is more suitable for specific places such as airports, the theoretical possibility exists for the popularization of the heating repairing method along with the popularization of natural energy such as solar energy, wind energy and the like, but the feasibility is not high in the current stage and the foreseeable time. The light repairing method is a most feasible method in the prior art and materials, and utilizes ultraviolet rays in sunlight to recombine the free basis of the broken macromolecular repairing agent in the damaged asphalt material so as to achieve the purpose of healing cracks. The main problems existing at present are that the variety of the suitable polymer repairing agent is limited, and the defects that the ultraviolet energy in sunlight fluctuates along with time and seasons and the like are also main limiting factors.
Therefore, the development of self-repairing modified asphalt with excellent road performance is an urgent need in the highway industry.
Disclosure of Invention
Aiming at overcoming the defects in the prior art, the invention provides the modified asphalt for pavement self-repairing, and the preparation method and the application thereof by adopting the method for polymerizing the styrene-butadiene rubber elastomer modified asphalt by the Random-block anionic solution, improving the low-temperature flexibility on the premise of ensuring the shear resistance and the shock resistance of the modified asphalt and adding the polysiloxane trithiocarbonate capable of self-repairing initiated by ultraviolet light. The invention provides a pavement self-repairing modified asphalt and a preparation method thereof, which can realize excellent road traffic performance and reduce crack generation and self-repairing performance.
The technical scheme of the invention is realized as follows:
the pavement self-repairing modified asphalt is mainly prepared from the following components in parts by weight: 75-85 parts of matrix asphalt, 8-11 parts of anion solution polymerized styrene-butadiene rubber elastomer, 5-10 parts of polysiloxane trithiocarbonate, 1-2 parts of flatting agent, 0.5-1.8 parts of photosensitizer and 0.3-0.5 part of active sulfur.
Preferably, 75-83 parts of matrix asphalt, 9-11 parts of anion solution polymerized styrene-butadiene rubber elastomer, 6-10 parts of polysiloxane trithiocarbonate, 1-2 parts of leveling agent, 0.5-1.7 parts of photosensitizer and 0.3-0.5 part of active sulfur. Most preferably, 75 parts of matrix asphalt, 11 parts of anion solution-polymerized styrene-butadiene rubber elastomer, 10 parts of polysiloxane trithiocarbonate, 2 parts of a leveling agent, 1.5 parts of a photosensitizer and 0.5 part of active sulfur.
The modified asphalt for self-repairing of the pavement is characterized in that the base asphalt is selected from one or a mixture of more of national standard No. 70 asphalt, no. 90 asphalt, no. 110 asphalt, no. 150 asphalt and No. 200 asphalt.
Preferably, the anion solution polymerized butadiene styrene rubber elastomer is autonomously synthesized by solution polymerization, or is made of a material of SAM1901 model provided by Balin petrochemical company, china petrochemical group, or is made of Dynasol @ Solprene1205。
According to the pavement self-repairing modified asphalt, the anion solution-polymerized styrene-butadiene rubber elastomer is autonomously synthesized by adopting solution polymerization, the synthesized anion solution-polymerized styrene-butadiene rubber elastomer is a Random-block anion solution-polymerized styrene-butadiene rubber elastomer, and the mass ratio of two monomers of styrene and butadiene is 20: 80-30: 70, the molecular weight is more than 20 ten thousand, the mass percentage of the block polystyrene in the block polystyrene is 12.5 to 20 percent, and the gel content is less than 0.5 percent. Preferably, the synthesized Random-block anionic solution polymerized styrene-butadiene rubber elastomer has a mass ratio of styrene to butadiene of 24.5:74.5, the number average molecular weight is 23.8 ten thousand, the mass percentage of block polystyrene in the block polystyrene is 17.8 percent, the gel content is less than 0.3 percent, and the mass ratio of two monomers of styrene and butadiene is 24.5:74.5, the mass ratio of the block polystyrene in the polystyrene is 17.8 percent, and the gel content is less than 0.3 percent, so that the balance of low-temperature flexibility, high-temperature impact resistance and shear resistance can be achieved; polymer modifiers with molecular weights greater than 20 million have higher tensile strength and elongation at break.
In the above modified asphalt for pavement self-repairing, the polysiloxane trithiocarbonate is obtained by addition of polyhydrosilicone oil and terminal alkylene cyclic trithiocarbonate, and in the invention, the polysiloxane trithiocarbonate is preferably polydimethylsiloxane trithiocarbonate, and the synthesis method thereof is as follows:
the polyhydro silicone oil is side chain hydrogen-containing silicone oil, the hydrogen content is 1.5-2.5%, the viscosity is 10-50 mm < 2 >/s at 25 ℃, and the viscosity can just meet the use requirement.
The terminal olefin trithiocarbonate is self-made, and the preparation method is referred to from the following steps: (1) synthesis of1,3-dithiane-2-thiones Agricultural and Biological Chemistry (1977), 41 (9), 1621-5; (2) 1,3-Dithiane-2-thiones jpn. Kokai Tokkyo Koho (1978), JP 53044578 a 19780421; (3) synthesis and biological activity of1, 3-dithiol,1,2-dithiolane and1, 3-dithione-2-thio Journal of the facility of Agriculture, kyushu University (1977), 22 (1-2), 1-13.
The polysiloxane trithiocarbonate has a Tg < -100 ℃, n is preferably 2 to 12, where n is the segment length, and more preferably n is 5 to 7. Under the condition, the polysiloxane trithiocarbonate with lower Tg ensures that the modified asphalt can still maintain a higher flow value at low temperature; n is 5-7, which can ensure the lower Tg of the trithiosulfate and the raw materials are easy to obtain.
The leveling agent is selected from one or more of polyether modified polydimethylsiloxane, polyacrylate leveling agent, acrylic-epoxy polyester polymer, polysiloxane polyether copolymer, fluorine-containing modified acrylate leveling agent or polyacrylate. In the invention, preferably, the polyether modified polydimethylsiloxane adopts BYK-333, the polyacrylate leveling agent adopts BYK-354, the acrylic-epoxy polyester polymer adopts Einstron ResiflowPV-88 leveling agent, the polysiloxane polyether copolymer adopts Tego 450, the fluorine-containing modified acrylate leveling agent adopts Mylar CS-3509, and the polyacrylate adopts EONLEO EL2820. More preferably, it is Mitig CS-3509 or EONLEO EL2820.
The modified asphalt for self-repairing of the pavement is characterized in that the photosensitizer is one or more selected from tetraphenylporphyrin iron (III) chloride photosensitizer, cobalt phthalocyanine or manganese phthalocyanine.
The modified asphalt for pavement self-repairing is characterized in that the active sulfur is sulfur sublimate, and the purity is more than 99.99%.
The common emulsion polymerized styrene-butadiene rubber for the low-temperature application modified asphalt is used as a modifier, is randomly arranged, has wider molecular weight distribution, and therefore has better compatibility with the asphalt and better low-temperature performance. However, since the emulsion polymerized styrene-butadiene rubber is randomly distributed and is usually partially gelled, large internal stress is generated, and the impact resistance and the shear resistance are poor due to heat generation during external impact. The anionic living polymerization is carried out by taking alkyl alkali metal such as alkyl lithium as anion catalyst, and reacting in non-proton solution or mixture of cyclohexane and dioxaneAnd carrying out the reaction of isocontrolled active polymerization in the mixed solution. The synthesized Random-block anionic solution polymerized styrene-butadiene rubber elastomer, SAM1901 type material and Dynasol adopted by the invention @ Solprene1205 and other anionic solution polymerized butadiene-styrene rubber elastomers belong to styrene-butadiene thermoplastic elastomers, and are random-block doped copolymers prepared from styrene and butadiene in a certain weight ratio through an anionic living polymerization process, and the random-block doped copolymers have large molecular weight and narrow molecular weight distribution. The block polystyrene chain segments are gathered together to form micro-domains dispersed between continuous phases formed by polybutadiene and asphalt, and the gel content is low, so that compared with the random styrene-butadiene rubber, the modified asphalt has higher hardness and impact resistance, and the anti-rutting and anti-shearing capabilities of the modified asphalt can be improved. The butadiene component content in the molecule of the rubber is more than 60-70% of that in the common SBS, the dispersion uniformity of the polymer in the asphalt is improved, and therefore, the rubber has more excellent low-temperature performance. The polydimethylsiloxane trithiocarbonate has low glass transition temperature<-100 ℃) and thus has good levelling properties. The polydimethylsiloxane trithiocarbonate can carry out self ring-opening polymerization through click reaction under the catalysis of ultraviolet light to form linear thiocarbonate. The self-repairing modified asphalt modifier can generate good synergistic effect with an SBS modifier in the modified asphalt and can be polymerized with sulfur-containing free radicals generated in the modified asphalt so as to realize the self-repairing function of the modified asphalt. The cyclotrithiocarbonate grafted polysiloxane has good compatibility with asphalt and low glass transition temperature, can effectively improve the flow value of the modified asphalt, effectively reduces the glass transition temperature of the asphalt when being added into the modified asphalt, and improves the rheological property of the modified asphalt, so that the self-recovery capability of the asphalt is greatly improved. Meanwhile, the non-Newtonian fluid characteristics of the polydimethylsiloxane trithiocarbonate have high resistance to rapid high impact force. Polymerizing styrene-butadiene rubber elastomer, SAM1901 type material, dynasol by using Random-block anionic solution @ In the process of modifying asphalt by adding active sulfur as stabilizer, solprene1205 and other anion solution polymerized styrene-butadiene rubber elastomers form a large amount of S 2 And S x Key, S x The bond is affected by light and heat during road use to generate sulfur-containing free radicalsWhen the modified asphalt generates micro cracks, the sulfur-containing free radicals on the styrene-butadiene rubber molecular chain can generate new C-S bonds with trithiocarbonate through click reaction under the action of ultraviolet light and the catalysis of a photosensitizer to form a new polymer chain, so that the healing of asphalt cracks and other diseases is accelerated, and the self-repairing is completed. The click reaction can be carried out when the condition is met, the self-repairing is carried out at any time, the high self-repairing rate is maintained, the polymer network in the modified asphalt is kept in a repairing state, and the attenuation of various mechanical properties of the modified asphalt is small. The damage which can not be observed in the material is eliminated, the broken material is reconnected, the abraded surface becomes smooth again, and the service life of the asphalt pavement is prolonged.
Based on the same inventive concept, the invention provides a preparation method of a pavement self-repairing modified asphalt, which comprises the following steps:
s1, stirring and heating matrix asphalt to 180-190 ℃, wherein the stirring speed is 300-500rpm;
s2, adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer into matrix asphalt for high-speed mixing, adding the modifier Random-block anionic solution polymerized styrene-butadiene rubber elastomer into the matrix asphalt for high-speed mixing for pre-dispersion, and grinding and dispersing the modified asphalt with the modifier pre-dispersed for 60-150 minutes by using a colloid mill; the active sulfur is added evenly in three batches, each time with an interval of 10-15 minutes, and then the stirring is continued for 30 minutes at 180 ℃. Preferably, the modified asphalt with the pre-dispersed modifier is ground and dispersed for 100 to 150 minutes by a colloid mill; the active sulfur is added evenly in three batches, each time with an interval of 10-15 minutes, and then the stirring is continued for 30 minutes at 180 ℃. Most preferably, the modified asphalt with the pre-dispersed modifier is ground and dispersed for 120 minutes by a colloid mill; the active sulfur is evenly added in three batches, each time interval is 15 minutes, and after the active sulfur is added, the stirring is continued for 30 minutes at 180 ℃.
And S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polysiloxane trithiocarbonate, stirring at a high speed for 60-90 minutes, and sequentially adding a leveling agent and a photosensitizer to obtain the road surface self-repairing modified asphalt. Preferably, the polysiloxane trithiocarbonate is added, stirred at a high speed for 70 to 90 minutes, and then the leveling agent and the photosensitizer are sequentially added. Most preferably, the leveling agent and the photosensitizer are added in sequence after polysiloxane trithiocarbonate is added and stirred for 90 minutes at a high speed.
Based on the same inventive concept, the invention provides application of the pavement self-repairing modified asphalt, which is applied to a pavement substrate.
The invention has the beneficial effects that:
1. the synthesized Random-block anionic solution polymerized styrene-butadiene rubber elastomer, SAM1901 type material and Dynasol adopted by the invention @ Solprene1205 and other anionic solution polymerized butadiene-styrene rubber elastomers belong to styrene-butadiene thermoplastic elastomers, and are random-block doped copolymers prepared from styrene and butadiene in a certain weight ratio through an anionic living polymerization process, and have the advantages of large molecular weight, narrow molecular weight distribution and low gel content. The high-temperature performance of SBS and the low-temperature performance of butadiene styrene rubber are both considered. The polydimethylsiloxane trithiocarbonate has low glass transition temperature<-100 ℃) and thus has good levelling properties. The polydimethylsiloxane trithiocarbonate can carry out self ring-opening polymerization through a click reaction under the catalysis of ultraviolet light, thereby greatly improving the self-recovery capability of the asphalt. Meanwhile, the non-Newtonian fluid property of the polydimethylsiloxane trithiocarbonate has high resistance to rapid high impact force. Polymerizing styrene-butadiene rubber elastomer, SAM1901 type material, dynasol by using Random-block anionic solution @ Active sulfur is added into an anion solution polymerized styrene-butadiene rubber elastomer such as Solprene1205 and the like as a stabilizer in the process of modifying asphalt to form a large number of S2 and Sx bonds, the Sx bonds generate sulfur-containing free radicals under the influence of light and heat in the road using process, and when the modified asphalt generates micro cracks, the sulfur-containing free radicals on a styrene-butadiene rubber molecular chain can react with trithiocarbonate to generate new C-S bonds under the action of ultraviolet light and the catalysis of a photosensitizer to form a new polymer chain, so that the healing of diseases such as asphalt cracks is accelerated, and the self repair is completed. The click reaction can be carried out when the condition is met, the self-repairing is carried out at any time, the high self-repairing rate is maintained, the polymer network in the modified asphalt is kept in a repairing state, and various mechanical properties of the modified asphaltThe attenuation is small, and cracks generated by the modified asphalt are eliminated, so that the service life of the asphalt pavement is prolonged.
2. The modified asphalt for pavement self-repairing provided by the invention adopts polysiloxane trithiocarbonate, can generate good synergistic effect with SBS modifier in the modified asphalt, and can be polymerized with sulfur-containing free radicals generated in the modified asphalt to realize the self-repairing function of the modified asphalt. Therefore, the road diseases are reduced, the maintenance frequency is reduced, and the service life of the road is prolonged.
3. The pavement self-repairing modified asphalt provided by the invention is obviously superior to modified asphalt in comparative examples and the prior art in single performance or comprehensive performance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the contents 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified. The anionic solution-polymerized styrene-butadiene rubber elastomers used in examples 1 to 3, example 6 and comparative example 2 were autonomously synthesized by solution polymerization, according to the following papers and related citations: (1) "preparation, structure and performance of uniformly and randomly distributed high styrene solution polymerized styrene-butadiene rubber", liuhua, 2015, beijing chemical university, master thesis; (2) "SSBR polymerization, structure and performance studies under high temperature conditions", daowen, 2009, university of great graduate, shuoshi thesis. The synthesized Random-block anionic solution polymerized styrene-butadiene rubber elastomer has the mass ratio of styrene to butadiene being 24.5:74.5, the number average molecular weight is 23.8 ten thousand, the mass percentage of the block polystyrene in the block polystyrene is 17.8 percent, and the gel content is less than 0.3 percent.
In this example 4, the anion solution polymerized styrene-butadiene rubber elastomer is dynasol @ solpren1205 provided by the holy petrochemical company ltd, a petrochemical group, china, and the anion solution polymerized styrene-butadiene rubber elastomer is SAM1901 type material provided by the holy petrochemical company ltd, a petrochemical group, china.
Example 1:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: 300 g of No. 110 asphalt, 300 g of No. 150 asphalt, 150 g of No. 200 asphalt, 110 g of Random-block anionic solution polymerized styrene-butadiene rubber elastomer, 100 g of polydimethylsiloxane trithiocarbonate (n = 5), 20 g of flatting agent BYK-333, and photosensitizer: 5 g of mixture of tetraphenylporphyrin iron (III) chloride photosensitizer and 10 g of cobalt phthalocyanine, and 5 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, sequentially adding the matrix asphalt, stirring and heating to 180 ℃, wherein the stirring speed is 500rpm;
s2, slowly adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer into the matrix asphalt in the step S1, and grinding and dispersing for 120 minutes under the action of a colloid mill at the rotating speed of 2500rpm; then adding the active sulfur stabilizer every other 15 minutes in three batches, and continuously stirring for 30 minutes after the addition, wherein the rotating speed is 500rpm;
and S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polydimethylsiloxane trithiocarbonate after swelling is finished, stirring at a high speed for 90 minutes, and sequentially adding a flatting agent BYK-333, tetraphenylporphyrin iron (III) chloride and a cobalt phthalocyanine photosensitizer to obtain the pavement self-repairing modified asphalt.
Example 2:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: 780 g of No. 150 asphalt, 100 g of Random-block anionic solution polymerized styrene-butadiene rubber elastomer, 80 g of polydimethylsiloxane trithiocarbonate (n = 5), 450 g of flatting agent Tego, and photosensitizer: 5 g of tetraphenylporphyrin iron (III) chloride photosensitizer, 10 g of cobalt phthalocyanine and 5 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating the matrix asphalt to 180 ℃, wherein the stirring speed is 500rpm;
s2, slowly adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer modifier into the matrix asphalt in the step S1, and grinding and dispersing for 150 minutes under the action of a shearing colloid mill at the rotating speed of 2000rpm; then adding the active sulfur stabilizer every other 15 minutes in three batches, and continuously stirring for 30 minutes after the addition, wherein the rotating speed is 500rpm;
s3, swelling, cooling the dispersed modified asphalt to 120 ℃, cooling to 120 ℃ after swelling is finished, adding polydimethylsiloxane trithiocarbonate, stirring at a high speed for 90 minutes, and sequentially adding a flatting agent Tego 450, tetraphenylporphyrin iron (III) chloride and a phthalocyanine cobalt photosensitizer to obtain the pavement self-repairing modified asphalt.
Example 3:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: 200 g of No. 90 asphalt, 200 g of No. 110 asphalt, 400 g of No. 150 asphalt, 90 g of Random-block anion solution polymerized styrene-butadiene rubber elastomer, 80 g of polydimethylsiloxane trithiocarbonate (n = 7), CS-3509 g of a leveling agent, 17 g of photosensitizer manganese phthalocyanine and 3 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating the matrix asphalt to 180 ℃, wherein the stirring speed is 400rpm;
s2, slowly adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer modifier into the matrix asphalt in the step S1, and grinding and dispersing for 120 minutes under the action of a shearing colloid mill at the rotating speed of 3000rpm; then adding the active sulfur stabilizer in three batches at 15-minute intervals, and continuing stirring for 30 minutes at 180 ℃ after the addition is finished.
And S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polydimethylsiloxane trithiocarbonate after swelling is finished, stirring at a high speed for 90 minutes, and sequentially adding a Mylar chart CS-3509 and a photosensitizer manganese phthalocyanine to obtain the pavement self-repairing modified asphalt.
Example 4:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: no. 110 asphalt 800 g, dynasol @ 80 g of Solprene1205 modifier, 90 g of polydimethylsiloxane trithiocarbonate (n = 6), 2820 g of leveling agent EONLEO EL, 7 g of photosensitizer cobalt phthalocyanine and 3 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating matrix asphalt to 180 ℃, wherein the stirring speed is 500rpm;
s2. Mixing Dynasol @ Slowly adding the Solprene1205 modifier into the matrix asphalt in the step S1, and grinding and dispersing for 100 minutes under the action of a shearing colloid mill at the rotating speed of 2500rpm; then adding the active sulfur stabilizer in three batches at 15-minute intervals, and continuing to stir for 30 minutes at 180 ℃ after the addition is finished.
And S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polydimethylsiloxane trithiocarbonate after swelling is finished, stirring for 80 minutes at a high speed, and sequentially adding flatting agents EONLEO EL2820 and cobalt phthalocyanine to obtain the road surface self-repairing modified asphalt.
Example 5:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: 430 g of No. 90 asphalt, 400 g of No. 150 asphalt, 90 g of SAM1901 modifier, 60 g of polydimethylsiloxane trithiocarbonate (n = 5), 10 g of resiflowPV-88 g of flatting agent, 5 g of photosensitizer cobalt phthalocyanine and 3 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating matrix asphalt to 180 ℃, wherein the stirring speed is 300rpm;
s2, slowly adding the SAM1901 modifier into the matrix asphalt obtained in the step S1, and grinding and dispersing for 120 minutes under the action of a shearing colloid mill at the rotating speed of 2500rpm; then adding the active sulfur stabilizer in three batches at 15-minute intervals, and continuing stirring for 30 minutes at 180 ℃ after the addition is finished.
And S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polydimethylsiloxane trithiocarbonate after swelling is finished, stirring at a high speed for 90 minutes, and sequentially adding Elite ResiflowPV-88 and cobalt phthalocyanine to obtain the pavement self-repairing modified asphalt.
Example 6:
the pavement self-repairing modified asphalt provided by the embodiment is mainly prepared from the following raw materials in parts by weight: 400 g of No. 90 asphalt, 450 g of No. 110 asphalt, 80 g of Random-block anion solution polymerized styrene-butadiene rubber elastomer, 50 g of polydimethylsiloxane trithiocarbonate (n = 5), 10 g of flatting agent BYK-354, 7 g of tetraphenylporphyrin iron (III) chloride photosensitizer and 3 g of active sulfur.
The pavement self-repairing modified asphalt provided by the embodiment is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating matrix asphalt to 180 ℃, wherein the stirring speed is 450rpm;
s2, slowly adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer modifier into the matrix asphalt in the step S1, and grinding and dispersing for 125 minutes under the action of a shearing colloid mill at the rotating speed of 3000rpm; then adding the active sulfur stabilizer in three batches at 15-minute intervals, and continuing stirring for 30 minutes at 180 ℃ after the addition is finished.
And S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polydimethylsiloxane trithiocarbonate after swelling is finished, stirring at a high speed for 70 minutes, and sequentially adding a flatting agent BYK-354 and tetraphenylporphyrin ferric chloride (III) to obtain the pavement self-repairing modified asphalt.
Comparative example 1
The modified asphalt provided by the comparative example is mainly prepared from the following raw materials in parts by weight: 300 g of No. 110 asphalt, 300 g of No. 150 asphalt, 150 g of No. 200 asphalt, 791H 110 g of SBS, 100 g of polydimethylsiloxane trithiocarbonate (n = 5), 20 g of leveling agent BYK-333, 5 g of mixture of tetraphenylporphyrin iron (III) chloride photosensitizer and 10 g of cobalt phthalocyanine, and 5 g of active sulfur. SBS791H was purchased from the Balin petrochemical division, china petrochemical group, and the S/B ratio of styrene to butadiene was 30/70.
The modified asphalt provided by the comparative example is prepared by the following preparation method, and specifically comprises the following steps:
s1, sequentially adding matrix asphalt, stirring and heating to 180 ℃, wherein the stirring speed is 500rpm;
s2, slowly adding SBS791H into the base asphalt in the step S1, grinding and dispersing for 120 minutes under the action of a colloid mill, wherein the rotating speed is 2500rpm; then adding the stabilizer every other 15 minutes in three batches, and continuously stirring for 30 minutes after the addition is finished, wherein the rotating speed is 500rpm;
and S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polysiloxane trithiocarbonate after swelling is finished, stirring at a high speed for 90 minutes, and sequentially adding a flatting agent BYK-333, a mixture photosensitizer of tetraphenylporphyrin iron (III) chloride and cobalt phthalocyanine to obtain the modified asphalt.
Comparative example 2:
the modified asphalt provided by the comparative example is mainly prepared from the following raw materials in parts by weight: 200 g of No. 90 asphalt, 200 g of No. 110 asphalt, 400 g of No. 150 asphalt, 90 g of Random-block anionic solution polymerized styrene-butadiene rubber elastomer, 80 g of rubber oil, 10 g of flatting agent Michael diagram CS-3509, 17 g of photosensitizer manganese phthalocyanine and 3 g of active sulfur.
The modified asphalt provided by the comparative example is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating matrix asphalt to 180 ℃, wherein the stirring speed is 400rpm;
s2, slowly adding the Random-block anionic solution polymerized styrene-butadiene rubber elastomer modifier into the matrix asphalt in the step S1, and grinding and dispersing for 120 minutes under the action of a shearing colloid mill at the rotating speed of 3000rpm; then adding the active sulfur stabilizer in three batches at 15-minute intervals, and continuing stirring for 30 minutes at 180 ℃ after the addition is finished.
S3, swelling, cooling the dispersed modified asphalt to 120 ℃, and sequentially adding a flatting agent CS-3509 and manganese phthalocyanine after swelling is finished to obtain the modified asphalt.
Comparative example 3:
the modified asphalt provided by the comparative example is mainly prepared from the following raw materials in parts by weight: 875 grams of No. 110 asphalt, 120 grams of SBR1500 rubber powder and 5 grams of active sulfur. The SBR1500 rubber powder is obtained from Shandong Qianlong chemical engineering Co., ltd.
The modified asphalt provided by the comparative example is prepared by the following preparation method, and specifically comprises the following steps:
s1, stirring and heating matrix asphalt to 180 ℃, wherein the stirring speed is 500rpm;
s2, slowly adding the SBR1500 rubber powder modifier into the matrix asphalt in the step S1, and grinding and dispersing for 120 minutes under the action of a shearing colloid mill at the rotating speed of 2500rpm; then adding the active sulfur stabilizer into the asphalt in three batches at intervals of 15 minutes, and continuously stirring the mixture for 30 minutes at 180 ℃ after the active sulfur stabilizer is added, thus obtaining the modified asphalt.
The performance evaluation and self-repairing performance evaluation of the modified asphalt road obtained in examples 1 to 6 and comparative examples 1 to 3 of the present invention were as follows:
1. evaluation of road performance:
the invention considers the actual situation of the current road situation in China, combines the test condition and the material supply situation, and selects AC-13C as the gradation type of the test research. The grading design is carried out according to the requirements of relevant grading ranges in the technical Specification for construction of asphalt pavement for roads (JTG F40-2004) in China.
TABLE 1AC-13 asphalt concrete grading Range
According to the Marshall mix design method of technical Specification for road asphalt pavement construction (JTG F40-2004), 4.2% of oilstone ratio is adopted in combination with practical experience to respectively manufacture standard Marshall test pieces. The mixing temperature of the test is 170 ℃, and the compaction temperature is controlled to be about 160 ℃. And (3) respectively measuring the indexes of the finished piece such as void ratio, mineral aggregate void ratio and the like, and the mechanical indexes such as Marshall stability, flow value and the like.
TABLE 2 Marshall test results
Test results of test pieces show that the Random-block anionic solution polymerized styrene-butadiene elastomer and the polydimethylsiloxane trithiocarbonate modified asphalt have relatively high flow values and better processing compatibility, the results of examples 1 to 6 of the invention are far higher than the water stability of comparative examples 1 to 3, and the polydimethylsiloxane trithiocarbonate plays a very large role in the water stability; meanwhile, the stability of the modified asphalt obtained by the invention is obviously higher than that of a comparative example, the modified asphalt has good adhesion with a base material and low void ratio. In particular, in example 1, the high-temperature stability and the bending strain, which most represent the road-use properties, are superior to those of the comparative examples and the conventional SBR rubber-modified asphalt, which are necessarily related to the unique molecular structure of the molecular chain of the added Random-block anionic solution polymerized styrene-butadiene elastomer.
2. Self-repairing performance evaluation:
for asphalt aging, at present, a systematic evaluation standard is not provided for judging the repairing effect after aging. Actual asphalt road damage is often much more complex than experimental testing. In order to simulate the self-repairing capability of the asphalt mixture in a real use environment, the inventor adopts a trabecular test piece to simulate the actual road application for evaluating the self-repairing rate.
(1) First, 6 groups of trabecular test pieces were made for each sample. The test piece is 250.0mm +/-2.0 mm in length, 30.0mm +/-2.0 mm in width and 35.0 +/-2.0 mm in height.
(2) And testing the low-temperature maximum bending strain of three groups of small beam products according to technical Specification for construction of asphalt road surfaces of highways (JTG F40-2004).
(3) And fixing the rest three-component type trabecular test piece on a support by using a clamp, wherein the span is 200mm. Standing for 2 hours for stabilization. And (3) carrying out fatigue loading on the trabecula by adopting an asphalt mixture bending tester according to a set loading program, recording the real-time flexural deformation by a data acquisition system until the trabecula reaches a preset midspan flexural deformation, stopping the loading of the system, and keeping for 2 hours to ensure that the formed flexural deformation is stable.
(4) Self-healing repair: will be step (3)
And (3) pulling the trabecular test piece with the fatigue damage to the initial position, taking out the test piece, putting the test piece into a Newport Sol-UV sunlight simulator, and carrying out self-healing repair for 12h at the temperature of 30 ℃.
(5) Self-repairing capability evaluation: and (3) after the test piece finishes self-repairing, testing the high-temperature dynamic stability and the low-temperature maximum bending strain according to the technical specification of highway asphalt pavement construction (JTG F40-2004) in the step (2) and averaging. And (3) calculating the self-repairing rate according to the test result:
self-repair rate = low-temperature maximum bending tensile strain/low-temperature maximum bending tensile strain after self-healing repair.
TABLE 3 evaluation of self-healing repair Capacity
As can be seen from the evaluation results of the self-repairing capability in Table 3, the modified asphalt of the formula system added with polysiloxane trithiocarbonate and photosensitizer can achieve about 90% of self-repairing rate after being irradiated for 12 hours by simulated UV sunlight, and the self-repairing capability is almost lost without the added formula. By adding polysiloxane trithiocarbonate, ideal self-repairing modified asphalt can be achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. The pavement self-repairing modified asphalt is characterized by being mainly prepared from the following components in parts by weight: 75-85 parts of matrix asphalt, 8-11 parts of anion solution polymerized styrene-butadiene rubber elastomer, 5-10 parts of polysiloxane trithiocarbonate, 1-2 parts of flatting agent, 0.5-1.8 parts of photosensitizer and 0.3-0.5 part of active sulfur.
2. The self-repairing modified asphalt for road surfaces, according to claim 1, is characterized in that the base asphalt is selected from one or a mixture of more of national standard No. 70 asphalt, no. 90 asphalt, no. 110 asphalt, no. 150 asphalt and No. 200 asphalt.
3. The modified asphalt for pavement self-repairing according to claim 2, wherein the anionic solution-polymerized styrene-butadiene rubber elastomer is autonomously synthesized by solution polymerization, or is made of a material of SAM1901 model provided by Batlin petrochemical company, inc., china petrochemical group, or is made of Dynasol @ Solprene1205。
4. The pavement self-repairing modified asphalt of claim 3, wherein the anion solution polymerized styrene-butadiene rubber elastomer is autonomously synthesized by solution polymerization, the synthesized anion solution polymerized styrene-butadiene rubber elastomer is a Random-block anion solution polymerized styrene-butadiene rubber elastomer, and the mass ratio of the two monomers of styrene and butadiene is 20: 80-30: 70, the molecular weight is more than 20 ten thousand, the mass percentage of the block polystyrene in the block polystyrene is 12.5 to 20 percent, and the gel content is less than 0.5 percent.
5. The pavement self-repairing modified asphalt of claim 1, wherein the polysiloxane trithiocarbonate is obtained by adding polyhydrosilicone oil and terminal alkylene cyclic trithiocarbonate, and the synthesis method comprises the following steps:
the polyhydrogen silicone oil is side chain hydrogen-containing silicone oil, the hydrogen content is 1.5-2.5%, and the viscosity is 10-50 mm at 25 DEG C 2 /s。
6. The asphalt as claimed in claim 1, wherein the leveling agent is one or more selected from polyether modified polydimethylsiloxane, polyacrylate leveling agent, acrylic-epoxy polyester polymer, polysiloxane polyether copolymer, fluorine-containing modified acrylate leveling agent or polyacrylate.
7. The asphalt as claimed in claim 1, wherein the photosensitizer is selected from one or more of tetraphenylporphyrin iron (III) chloride photosensitizer, cobalt phthalocyanine and manganese phthalocyanine.
8. The modified asphalt for pavement self-repairing according to claim 1, characterized in that the active sulfur is sulfur trichloride, and the purity is more than 99.99%.
9. The preparation method of the modified asphalt for pavement self-repairing according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, stirring and heating matrix asphalt to 180-190 ℃, wherein the stirring speed is 300-500rpm;
s2, adding the anion solution polymerized styrene-butadiene rubber elastomer into matrix asphalt for high-speed mixing, adding the modifier anion solution polymerized styrene-butadiene rubber elastomer into the matrix asphalt for high-speed stirring for pre-dispersion, and grinding and dispersing the modified asphalt with the pre-dispersed modifier for 60-150 minutes by using a colloid mill; the active sulfur is added evenly in three batches, the interval of each time is 10-15 minutes, and the stirring is continued for 30 minutes at 180 ℃ after the addition is finished.
S3, swelling, cooling the dispersed modified asphalt to 120 ℃, adding polysiloxane trithiocarbonate, stirring at a high speed for 60-90 minutes, and sequentially adding a leveling agent and a photosensitizer to obtain the pavement self-repairing modified asphalt.
10. The application of the modified asphalt for pavement self-repairing according to any one of claims 1 to 8 or the modified asphalt for pavement self-repairing prepared by the preparation method of claim 9,
the method is applied to a pavement substrate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115584134A (en) * | 2022-11-04 | 2023-01-10 | 新疆交通科学研究院有限责任公司 | Material for recovering performance of aged asphalt in asphalt pavement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101068910A (en) * | 2004-10-26 | 2007-11-07 | 科聚亚公司 | 1,3-dithiolane-2-thione additives for lubricants and fuels |
| CN109749468A (en) * | 2016-11-30 | 2019-05-14 | 苏州益可泰电子材料有限公司 | modified asphalt material |
| CN110041720A (en) * | 2019-05-07 | 2019-07-23 | 无锡市城市道桥科技有限公司 | A kind of high adhered modification asphalt material and preparation method thereof |
| CN113354785A (en) * | 2020-03-03 | 2021-09-07 | 旭化成株式会社 | Block copolymer, asphalt composition and modified asphalt mixture |
-
2022
- 2022-12-30 CN CN202211738110.9A patent/CN115926485B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101068910A (en) * | 2004-10-26 | 2007-11-07 | 科聚亚公司 | 1,3-dithiolane-2-thione additives for lubricants and fuels |
| CN109749468A (en) * | 2016-11-30 | 2019-05-14 | 苏州益可泰电子材料有限公司 | modified asphalt material |
| CN110041720A (en) * | 2019-05-07 | 2019-07-23 | 无锡市城市道桥科技有限公司 | A kind of high adhered modification asphalt material and preparation method thereof |
| CN113354785A (en) * | 2020-03-03 | 2021-09-07 | 旭化成株式会社 | Block copolymer, asphalt composition and modified asphalt mixture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115584134A (en) * | 2022-11-04 | 2023-01-10 | 新疆交通科学研究院有限责任公司 | Material for recovering performance of aged asphalt in asphalt pavement |
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|---|---|
| CN115926485B (en) | 2024-04-09 |
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