CN111607242A - Anti-aging modified asphalt composition and preparation method and application thereof - Google Patents
Anti-aging modified asphalt composition and preparation method and application thereof Download PDFInfo
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- CN111607242A CN111607242A CN202010485341.8A CN202010485341A CN111607242A CN 111607242 A CN111607242 A CN 111607242A CN 202010485341 A CN202010485341 A CN 202010485341A CN 111607242 A CN111607242 A CN 111607242A
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- 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
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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
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
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- 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
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- 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
Abstract
The invention relates to the technical field of road engineering, in particular to an anti-aging modified asphalt composition, and a preparation method and application thereof. The modified asphalt composition comprises the following raw materials in parts by weight: 100 parts of asphalt; 5-10 parts of a thermoplastic elastomer; 2-6 parts of a tackifier; 0.1-1 part of a vulcanizing agent; 0.1-1 part of anti-aging agent. The thermoplastic elastomer is introduced into the anti-aging asphalt composition and is matched with other substances such as a tackifier and the like for use, so that the viscosity of asphalt is improved, sufficient cohesive force can be provided for aggregates, the technical requirements of asphalt cement of a drainage pavement are met, meanwhile, the anti-aging modified asphalt for the drainage pavement has high anti-aging performance, the problems of loosening, material removal and the like caused by aging of the drainage asphalt pavement in the using process are solved, and the service life of the drainage asphalt pavement is prolonged.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to an anti-aging modified asphalt composition, and a preparation method and application thereof.
Background
The drainage pavement usually refers to a pavement through which rainwater can pass quickly without accumulating water, and has the most remarkable characteristic that a pavement surface layer material has larger gaps, the porosity of the drainage asphalt pavement is usually more than 15%, and the large-pore asphalt pavement not only can play a drainage effect, but also can absorb noise generated in the driving process of a vehicle, so that the driving comfort is improved. In general, a large-pore road surface has a large structural depth and good anti-skid properties. The drainage asphalt pavement has wide application prospect as a functional pavement.
The core material of the drainage asphalt pavement is asphalt cement, and as the asphalt mixture adopts an open-graded scheme, the effective bonding area between coarse aggregates is small, so that the requirement on the bonding property of the asphalt cement is higher, and high-viscosity modified asphalt, such as rubber powder modified asphalt, high-content polymer modified asphalt and the like, is generally adopted. The high-content polymer modified asphalt is favored by vast road builders due to the excellent bonding property and good storage stability.
In general, thermoplastic elastomer is added or modified to asphalt to improve various indexes, viscosity, softening point, etc. of asphalt, wherein styrene-butadiene-styrene copolymer is most widely used, however, when an amount of a polymer added is too large, segregation and the like generally occur, and a certain amount of a vulcanizing agent is required to be added to cause a crosslinking reaction, so that the components are not segregated and have good storage stability. Meanwhile, the performance of the asphalt is gradually improved and reduced along with the increase of the addition amount of one polymer. It is therefore necessary to add a tackifier to the asphalt to impart greater adhesion to the asphalt to ensure effective adhesion.
Because the porosity of the drainage asphalt pavement is large, asphalt adhered to the surface of the aggregate is exposed in the environment, is easy to age under the comprehensive action of factors such as sunlight, rainwater and the like, the adhesion of the asphalt is reduced, and the surface mixture is loosened and falls off, so that the improvement of the aging resistance of the asphalt cement has important significance for prolonging the service life of the drainage asphalt pavement.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide an anti-aging modified asphalt composition, a preparation method and a use thereof, which are used for solving the problems in the prior art.
In order to achieve the above and other related objects, one aspect of the present invention provides a modified asphalt composition, which comprises the following components in parts by weight:
in some embodiments of the invention, the asphalt is selected from the group consisting of petroleum asphalt; the penetration of the asphalt is 30-500 dmm.
In some embodiments of the invention, the thermoplastic elastomer is selected from the group consisting of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, styrene-ethylene-propylene-styrene copolymer, and combinations of one or more thereof.
In some embodiments of the invention, the thermoplastic elastomer is selected from styrene-butadiene-styrene copolymers.
In some embodiments of the invention, the styrene-butadiene-styrene copolymer has a molecular weight of 6 to 12 ten thousand; the styrene content in the styrene-butadiene-styrene copolymer is 30-40 percent; the elongation at break is 700-1000%.
In some embodiments of the present invention, the thermoplastic elastomer has a number average molecular weight of 1 to 20 ten thousand.
In some embodiments of the invention, the tackifier is selected from terpene resins; the molecular weight of the tackifier is 300-2000, the melting point is 100-140 ℃, and the relative density is 0.95-1.0.
In some embodiments of the invention, the vulcanizing agent is selected from vulcanizing agent DTDM.
In some embodiments of the invention, the age resister is selected from N-isopropyl-N' -phenyl-p-phenylenediamine.
The invention also provides a preparation method of the modified asphalt composition, which comprises the steps of heating asphalt, and adding the thermoplastic elastomer, the tackifier, the vulcanizing agent and the anti-aging agent into the heated asphalt.
In some embodiments of the invention, the asphalt is heated at a temperature of 180 to 190 ℃.
In another aspect, the present invention provides the use of the modified asphalt composition of the present invention in the road surfacing field.
In another aspect, the present invention provides a road surface covering prepared from the modified asphalt composition of the present invention.
Detailed Description
The inventor of the invention provides an anti-aging asphalt composition for drainage pavement and a preparation method and application thereof through a large number of exploration experiments, the anti-aging asphalt composition improves the viscosity of asphalt by introducing a thermoplastic elastomer and matching the thermoplastic elastomer with other substances such as a tackifier and the like for use, can provide enough cohesive force among aggregates, meets the technical requirements of asphalt cementing materials of the drainage pavement, has high anti-aging performance, solves the problems of loosening and stripping of the drainage asphalt pavement caused by aging in the using process, prolongs the service life of the drainage asphalt pavement, and has certain economic and social benefits.
An aspect of the present invention provides a modified asphalt composition, the raw materials of which may include asphalt, a thermoplastic elastomer, a tackifier, a vulcanizing agent, and an anti-aging agent.
The modified asphalt composition provided by the invention can comprise 100 parts of asphalt by weight, and the asphalt can be petroleum asphalt with penetration ((25 ℃, 5s, 100g)/0.1mm) of 30-500 dmm, 30-100 dmm, 100-200 dmm, 200-300 dmm, 300-400 dmm or 400-500 dmm. In one embodiment of the present invention, the asphalt may be petroleum asphalt having a penetration of 30 to 100 dmm. In one embodiment of the invention, the asphalt may be petroleum asphalt No. 70.
The modified asphalt composition provided by the invention can comprise 5-10 parts, 6-9 parts or 7-8 parts of thermoplastic elastomer by weight of raw materials, wherein the thermoplastic elastomer is a block copolymer formed by polymerizing vinyl aromatic monomers (such as styrene) in aliphatic groups containing at least two unsaturated olefins. The number average molecular weight of the thermoplastic elastomer is 1-20 ten thousand, 1-5 ten thousand, 6-10 ten thousand, 11-15 ten thousand or 16-20 ten thousand. Specifically, the thermoplastic elastomer is selected from one or more of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, and styrene-ethylene-propylene-styrene copolymer.
In a particular embodiment, the thermoplastic elastomer is selected from styrene-butadiene-styrene copolymers, namely SBS. Generally, it is a triblock copolymer having a molecular configuration of A-B-A type comprising polystyrene (S) as a terminal block and a butadiene (B) copolymer as an intermediate elastomeric block. The number average molecular weight of the styrene-butadiene-styrene copolymer can be generally 6 to 12 ten thousand, 6 to 8 ten thousand, or 9 to 12 ten thousand. The styrene-butadiene-styrene copolymer contains 30-40% of styrene. Elongation at break is 700-1000%, 700-800%, 800-900%, or 900-1000%. The test method can refer to GB/T2567-2008.
The modified asphalt composition provided by the invention can comprise 2-6 parts or 3-5 parts of tackifier by weight of raw materials, wherein the tackifier is a resin substance for improving the surface adhesive force of materials, and tackifying resin is selected. The tackifier has a molecular weight of 300-2000, 300-500, 500-800, 800-1200, 1200-1500, or 1500-2000. The melting point is 100-140 ℃, 100-110 ℃, 110-120 ℃, 120-130 ℃ or 130-140 ℃. The relative density is 0.95 to 1.0.
In one embodiment, the tackifier is selected from terpene resins having a molecular weight of 300-2000, 300-500, 500-800, 800-1200, 1200-1500, or 1500-2000. The melting point is 100-140 ℃, 100-110 ℃, 110-120 ℃, 120-130 ℃ or 130-140 ℃. The relative density is 0.95 to 1.0.
The modified asphalt composition provided by the invention comprises 0.1-1 part, 0.2-0.9 part, 0.3-0.8 part, 0.4-0.7 part or 0.5-0.6 part of vulcanizing agent by weight of raw materials, wherein the vulcanizing agent is a substance capable of causing moderate cross-linking reaction between molecules to form a network structure. In a particular embodiment, the vulcanizing agent is chosen from vulcanizing agents DTDM, formula C8H16N2O2S2The vulcanizing agent DTDM had a molecular weight of 236, a melting point of 125 ℃ and a relative density of 1.36.
The modified asphalt composition provided by the invention comprises 0.1-1 part, 0.2-0.9 part, 0.3-0.8 part, 0.4-0.7 part or 0.5-0.6 part of antioxidant by weight of raw materials. The anti-aging agent is a substance which is added properly for preventing the performance of the high polymer material from being attenuated under the conditions of heat, light and oxygen. In a specific embodiment, the age resistor is selected from N-isopropyl-N' -phenyl-p-phenylenediamine. The molecular weight of the N-isopropyl-N' -phenyl-p-phenylenediamine is 226, the melting point is 80.5 ℃, and the relative density is 1.14.
In a specific embodiment of the invention, the modified asphalt composition comprises the following raw materials in parts by weight:
the invention also provides a preparation method of the modified asphalt composition, which comprises the steps of heating asphalt, and adding the thermoplastic elastomer, the tackifier, the vulcanizing agent and the anti-aging agent into the heated asphalt. In the preparation method of the modified asphalt composition provided by the invention, the asphalt can be heated to 180-190 ℃, 180-185 ℃ or 185-190 ℃. And mixing with other components in the order of mixing the asphalt with the thermoplastic elastomer, the tackifier, the vulcanizing agent and the anti-aging agent. During the mixing process of the asphalt, the thermoplastic elastomer, the tackifier, the vulcanizing agent and the anti-aging agent in sequence, the thermoplastic elastomer and the tackifier can be slowly added into the asphalt, and after high-speed stirring, the vulcanizing agent and the anti-aging agent are added for stirring reaction to prepare the modified asphalt. The thermoplastic elastomer and the tackifier are slowly added into the asphalt, the high-speed stirring time can be 30-40 min, and the rotating speed of a stirrer used in the high-speed stirring process is as follows: 1000-1500 rpm, 1000-1200 rpm, or 1200-1500 rpm, and the temperature of the asphalt is controlled to be 185 ℃ in the stirring process. The vulcanizing agent and the anti-aging agent are added, stirred, reacted and stirred for 40-60 min.
Another aspect of the invention provides the use of the high viscosity asphalt composition in the road surfacing field. The road overlay usually refers to a surface layer additionally paved on the original asphalt pavement, and the road overlay can usually improve the service quality of the asphalt pavement and improve various performances of the pavement. The pavement covering may typically be a thin layer covering, which may have a thickness of 0.8 to 1.5 cm. The road overlay is specifically a drainage asphalt pavement. The drainage pavement usually refers to a pavement through which rainwater can pass quickly without accumulating water, and has the most remarkable characteristic that a pavement surface layer material has larger gaps, the porosity of the drainage asphalt pavement is usually more than 15%, and the large-pore asphalt pavement not only can play a drainage effect, but also can absorb noise generated in the driving process of a vehicle, so that the driving comfort is improved.
The invention also provides a road surface which is prepared from the anti-aging asphalt composition. The overlay may generally cover the asphalt road, thereby enhancing various performance characteristics of the asphalt road. One skilled in the art can select a suitable method for forming the overlay on the surface of the road, for example, the asphalt composition can be coated on the asphalt road by utilizing the fluidity of the anti-aging asphalt composition at high temperature, and the overlay can be formed after cooling.
The modified asphalt composition provided by the invention is added with a certain amount of traditional thermoplastic elastomer, so that the modified asphalt has good road performance, and the asphalt mixture is ensured to have the characteristics of sufficient high-temperature stability, low-temperature crack resistance, fatigue resistance and the like. On the basis, the tackifier is added, so that the viscosity of the modified asphalt is greatly improved, the asphalt has enough adhesiveness, the modified asphalt has very obvious advantages when being applied to a drainage pavement, and the sufficient adhesiveness can well bond aggregate so that the problems of loosening, falling and the like are avoided.
The vulcanizing agent is added into the modified asphalt composition provided by the invention, and due to the higher addition amount of the thermoplastic elastomer, the addition of the vulcanizing agent can enable the modified asphalt molecules to generate proper crosslinking action to form a certain network structure, so that the modified asphalt has good storage stability and can not generate phenomena such as segregation and the like, and potential possibility is provided for large-area popularization and application of the modified asphalt.
The anti-aging agent is added into the modified asphalt composition provided by the invention, so that the anti-aging performance of the modified asphalt is improved, the problems of loosening and falling, pits and the like caused by the aging of the asphalt on the drainage pavement can be solved when the modified asphalt composition is applied to the drainage pavement, and the modified asphalt composition has good practical value.
The preparation method of the modified asphalt composition provided by the invention is simple to operate and easy to realize, and the modified asphalt prepared by the method has uniform appearance, no segregation phenomenon and stable performance.
The following examples are provided to further illustrate the advantageous effects of the present invention.
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is further described in detail below with reference to examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention and are not for limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The examples were prepared under conventional conditions or conditions recommended by the material suppliers without specifying specific experimental conditions or operating conditions.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In the following examples, reagents, materials and instruments used are commercially available unless otherwise specified.
Unless otherwise stated, the asphalt used was petroleum asphalt for the Esso No. 70 road, the styrene-butadiene-styrene triblock copolymer was YH791 manufactured by Yueyang petrochemical company, the vulcanizing agent DTDM was manufactured by Shanghai Kaiki chemical Co., Ltd., the terpene resin was F-110 manufactured by Shandong Jinan chemical Co., Ltd., the softening point was 115 ℃ and the molecular weight was 1800. The anti-aging agent is IPPD produced by Shijiazhuang, maofeng chemical Co.
Heating asphalt to 185 ℃, weighing the components with corresponding mass according to the weight parts of the components in the following examples 1-12, according to the preparation method of the modified asphalt composition, firstly slowly adding a thermoplastic elastomer (styrene-butadiene-styrene triblock copolymer (SBS)) and a tackifier (terpene resin) into the asphalt, stirring at a high speed for 30min, then stirring at a high speed at a rotating speed of 1000 revolutions per minute, then adding a vulcanizing agent (vulcanizing agent DTDM) and an anti-aging agent (anti-aging agent IPPD), and stirring and reacting for 40min to prepare the modified asphalt composition. And after the preparation is finished, sampling and storing the modified asphalt for performance test. The test standard is road engineering asphalt and asphalt mixture test protocol (JTG E20-2011), and the test method is shown in Table 1 below
TABLE 1
Examples 1 to 3
The performance indexes of the asphalt under different SBS weight parts are shown in Table 2
TABLE 2
The test results in Table 2 show that as the parts by weight of SBS are gradually increased, the softening point of the modified asphalt composition is increased from 83 ℃ to 99 ℃, the ductility at 5 ℃ is increased from 32.1cm to 43.4cm, and the viscosity at 60 ℃ of the asphalt is also increased, which shows that the performance of the asphalt is remarkably improved, and the modification effect is obvious.
Examples 4 to 6
The performance indexes of the asphalt with different tackifier weight portions are shown in Table 3
TABLE 3
From the test results in table 3, it can be seen that as the weight part of the tackifier is increased from 2 to 6, the viscosity increase of 60 degrees of the asphalt is increased from 254700 to 880900, which meets the technical requirements of drainage pavement, and shows that the viscosity increase effect of the tackifier on the asphalt is obvious.
Examples 7 to 9
The performance indexes of the asphalt with different vulcanizing agents in parts by weight are shown in Table 4
TABLE 4
The test results in table 4 show that the group without the vulcanizing agent has obvious segregation, the difference between the softening points of the upper part and the lower part reaches 3.6 ℃, and the softening point difference is remarkably reduced in the embodiment with the vulcanizing agent, which indicates that the storage stability of the modified asphalt is greatly improved by adding the vulcanizing agent.
Examples 10 to 12
The performance indexes of the asphalt with different anti-aging agent weight portions are shown in Table 5
TABLE 5
The test results in Table 5 show that the modified asphalt without the anti-aging agent has obviously reduced performance after aging, the penetration ratio is reduced to 72 percent, and the ductility is reduced to 22.7cm, which indicates that the asphalt is hardened and embrittled and has deeper aging degree. The aging resistance of the modified asphalt added with the anti-aging agent is less attenuated after aging, which shows that the aging resistance of the modified asphalt can be obviously improved by adding the anti-aging agent.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. The modified asphalt composition comprises the following raw materials in parts by weight:
2. the modified asphalt composition of claim 1, wherein the asphalt is selected from the group consisting of petroleum asphalt; the penetration of the asphalt is 30-500 dmm.
3. The modified asphalt composition of claim 1, wherein the thermoplastic elastomer is selected from the group consisting of one or more of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, and styrene-ethylene-propylene-styrene copolymer.
4. The modified asphalt composition of claim 1, wherein the thermoplastic elastomer is selected from the group consisting of styrene-butadiene-styrene copolymers.
5. The modified asphalt composition of claim 4, wherein the styrene-butadiene-styrene copolymer has a molecular weight of 6 to 12 ten thousand; the styrene content in the styrene-butadiene-styrene copolymer is 30 to 40 percent; the elongation at break is 700-1000%.
6. The modified-asphalt composition of claim 1, further comprising any one or more of the following conditions:
A1) the number average molecular weight of the thermoplastic elastomer is 1-20 ten thousand;
A2) the tackifier is selected from terpene resins; the molecular weight of the tackifier is 300-2000; the melting point is 100-140 ℃; the relative density is 0.95-1.0;
A3) the vulcanizing agent is selected from a vulcanizing agent DTDM;
A4) the anti-aging agent is selected from N-isopropyl-N' -phenyl-p-phenylenediamine.
7. The method for producing a modified asphalt composition according to claims 1 to 6, which comprises heating the asphalt and adding the thermoplastic elastomer, the tackifier, the vulcanizing agent and the anti-aging agent to the heated asphalt.
8. The method of claim 7, wherein the asphalt is heated at a temperature of 180 to 190 ℃.
9. Use of the modified asphalt composition according to any one of claims 1 to 6 in the field of road coverings.
10. A road surface covering prepared from the modified asphalt composition of any one of claims 1 to 6.
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| CN112661443A (en) * | 2021-01-15 | 2021-04-16 | 广东华路交通科技有限公司 | High-performance economical asphalt mixture and construction method thereof |
| CN115637052A (en) * | 2022-08-16 | 2023-01-24 | 招商局重庆交通科研设计院有限公司 | Warm-mixed regenerant for in-situ heat regeneration and preparation method thereof |
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