CN110746787A - Anti-aging penetration type asphalt regenerant and preparation method thereof - Google Patents
Anti-aging penetration type asphalt regenerant and preparation method thereof Download PDFInfo
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- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses an aging-resistant permeable asphalt regenerant and a preparation method thereof, wherein the aging-resistant permeable asphalt regenerant is prepared from the following raw materials in parts by mass: 80-95 parts of base oil, 8-12 parts of a compatibilizer, 2-4 parts of an anti-aging agent, 0.5-1.2 parts of a wetting agent and 3-5 parts of a penetrating agent. The asphalt pavement regenerant disclosed by the invention is excellent in permeability, good in aging resistance and simple in preparation process.
Description
Technical Field
The invention relates to the field of recycling of aged asphalt of asphalt pavements, in particular to an aging-resistant permeable asphalt regenerant and a preparation method thereof.
Background
The waste asphalt mixture is used for regeneration, so that the waste can be effectively treated, waste accumulation and occupied area are reduced, and waste treatment cost is saved. Meanwhile, the recycling of the waste materials can save a large amount of high-quality new asphalt and sandstone materials, and can also reduce environmental and safety problems such as water and soil loss, landslide and the like caused by aggregate mining. The key of the recycling of the waste asphalt mixture is the regeneration of the waste asphalt, and the regeneration of the waste asphalt is closely related to the performance of an asphalt regenerant. Therefore, the development of high-performance asphalt recycling agents becomes the key point of asphalt pavement recycling.
At present, there are two major asphalt regeneration theories generally accepted by scholars, one is a component regulation theory, and the other is a compatibility theory. The component regulation theory starts from the migration of asphalt chemical components, and light components with reduced content caused by aging are supplemented into the aged asphalt, so that the proportion of each component in the regenerated asphalt is restored to a new asphalt level, the coordination and compatibility among the components are improved, a stable dispersion system is formed, and the performance of the aged asphalt is improved; the compatibility theory considers that the solubility parameter value between asphaltene and soft asphaltene is increased after the asphalt is aged, the dissolving and dispersing capacity of the soft asphaltene to the asphaltene is reduced, and a stable high molecular solution cannot be formed, so that the pavement performance is deteriorated. The addition of the regenerant into the old asphalt not only reduces the solubility parameter difference between the maltha and the asphaltene, but also improves the capability of the maltha to dissolve the asphaltene, improves the compatibility of the maltha and the asphaltene, and further recovers the performance of the aged asphalt.
Based on the two theories, the scholars develop a large amount of road asphalt regenerants suitable for different environments. For example, patent application CN108864718A proposes a preparation method of a high permeability asphalt recycling agent, which has excellent permeability and good recycling effect, but further application of the asphalt recycling agent is limited due to its complicated preparation process. On the basis of the two theories, the patent application CN107603252A considers the influence of wax in asphalt on the performance of aged asphalt, and improves the low-temperature performance of the regenerated asphalt by adding a wax crystal dispersant, while the wax content in common road petroleum asphalt is lower, and the method has limited effect on improving the performance of the regenerated asphalt. Patent application CN108504111A proposes an anti-aging asphalt regenerant based on bio-oil and a preparation method thereof, and although the addition of a plurality of anti-aging agents can improve the anti-aging performance of the regenerant, the permeability of the regenerant is reduced, and the regeneration effect is reduced. In view of the problems of the above recycling agents, it is urgently needed to develop an asphalt pavement recycling agent with simple and feasible preparation process, excellent permeability, good thermal stability and aging resistance.
Disclosure of Invention
The invention aims to provide an anti-aging penetration type asphalt regenerant and a preparation method thereof, which are used for overcoming two practical problems of poor thermal stability and aging resistance and poor penetration performance caused by poor heat stability and aging resistance due to high content of light components in the conventional asphalt regenerant.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-aging penetration type asphalt regenerant is prepared from the following raw materials in parts by mass: 80-95 parts of base oil, 8-12 parts of a compatibilizer, 2-4 parts of an anti-aging agent, 0.5-1.2 parts of a wetting agent and 3-5 parts of a penetrating agent; the base oil is a mixture of catalytic cracking slurry oil and residual oil, and the aromatic content of the mixture of the catalytic cracking slurry oil and the residual oil is more than 70%; the compatibilizer is a mixture of an anionic surfactant and maleic anhydride; the anti-aging agent is phyllosilicate; the penetrating agent is a nonionic surfactant.
Further, the base oil is formed by mixing catalytic cracking slurry oil and residual oil according to the mass ratio of 2: 1.
Further, the anionic surfactant is sulfonate, the maleic anhydride is maleic anhydride, and the mass ratio of the sulfonate to the maleic anhydride is 1: 1.
Further, the layered silicate is montmorillonite or hydrotalcite.
Further, the wetting agent is alkylphenol polyoxyethylene.
Further, the nonionic surfactant adopts fatty alcohol-polyoxyethylene ether.
A preparation method of an aging-resistant penetration asphalt regenerant comprises the following steps:
the method comprises the following steps: adding base oil into a reaction container, adding a compatibilizer at 110-130 ℃, and stirring at 300-400 r/min for 20-30 min to prepare a regenerant mother liquor preliminarily;
step two: the temperature is increased to 120 ℃ to 130 ℃, an anti-aging agent is added, and the mixture is stirred for 45min to 60r/min at the constant temperature of 800r/min to 1000 r/min;
step three: and (3) reducing the temperature of the solution to 80-95 ℃, then adding a wetting agent and a penetrating agent into the reaction vessel, stirring for 15-20 minutes at a constant temperature of 200-300 r/min, and standing and cooling to obtain the anti-aging penetrating asphalt regenerant.
Compared with the prior art, the invention has the following beneficial technical effects:
the anti-aging agent using the layered silicate as the regenerant can effectively resist the invasion of hot oxygen and reduce the influence of factors such as the hot oxygen on the performance of the polymer due to the unique lamellar structure. Therefore, the phyllosilicate can not only improve the aging resistance of the asphalt regenerant, but also be used as a modifier to modify the regenerated asphalt and improve the secondary aging resistance of the regenerated asphalt. The special structure formed by the phyllosilicate under the action of heating and external mechanical force can obviously improve the thermal stability of the polymer, and the phyllosilicate can be used as the component of the asphalt regenerant to improve the flash point of the asphalt regenerant, so that the safety performance is obviously improved. In addition, the addition of the phyllosilicate can adjust the viscosity of the regenerant, and the adverse effect of the addition of micromolecule substances such as penetrant on the performance index of the regenerant is reduced; in order to improve the permeation effect of the asphalt regenerant in the waste asphalt, the association degree of the asphaltine agglomerated due to aging is reduced by adding the compatibilizer obtained by compounding the sulfonate and the maleic anhydride, the resistance of the regenerant in the permeation process is reduced, and the permeation and diffusion properties of the asphalt regenerant in the waste asphalt are further improved. The use of the wetting agent and the penetrating agent can reduce the time for the surface of the waste asphalt wetted by the regenerant on one hand, and can enable the regenerant to quickly penetrate and diffuse into the waste asphalt on the other hand, thereby improving the regeneration efficiency and the actual effect of the regenerant.
Detailed Description
Embodiments of the invention are described in further detail below:
an anti-aging penetration type asphalt regenerant is prepared from the following raw materials in parts by mass: 80-95 parts of base oil, 8-12 parts of a compatibilizer, 2-4 parts of an anti-aging agent, 0.5-1.2 parts of a wetting agent and 3-5 parts of a penetrating agent; the base oil is a mixture obtained by mixing catalytic cracking slurry oil and residual oil according to the mass ratio of 2:1, and the aromatic content in the mixture of the catalytic cracking slurry oil and the residual oil is more than 70%; the compatibilizer is a mixture of an anionic surfactant and maleic anhydride, the anionic surfactant is sulfonate, the maleic anhydride is maleic anhydride, and the mass ratio of the sulfonate to the maleic anhydride is 1: 1; the anti-aging agent is a layered silicate, and the layered silicate is montmorillonite or hydrotalcite; the wetting agent is alkylphenol polyoxyethylene; the penetrating agent is a nonionic surfactant, and the nonionic surfactant is fatty alcohol-polyoxyethylene ether.
A preparation method of an aging-resistant penetration asphalt regenerant comprises the following steps:
the method comprises the following steps: adding base oil into a reaction container, adding a compatibilizer at 110-130 ℃, and stirring at 300-400 r/min for 20-30 min to prepare a regenerant mother liquor preliminarily;
step two: the temperature is increased to 120 ℃ to 130 ℃, an anti-aging agent is added, and the mixture is stirred for 45min to 60r/min at the constant temperature of 800r/min to 1000 r/min;
step three: and (3) reducing the temperature of the solution to 80-95 ℃, then adding a wetting agent and a penetrating agent into the reaction vessel, stirring for 15-20 minutes at a constant temperature of 200-300 r/min, and standing and cooling to obtain the anti-aging penetrating asphalt regenerant.
The present invention is described in further detail below with reference to examples:
example 1
According to the mass parts, 80 parts of catalytic cracking slurry oil and residual oil are mixed according to the ratio of 2: adding the base oil prepared by 1 into a three-neck flask, adding 8 parts of compatibilizer obtained by compounding sulfonate and maleic anhydride into the base oil, stirring at the speed of 300r/min for 20min, and controlling the constant temperature during stirring at 110 ℃; after stirring, heating to 120 ℃, adding 2 parts of montmorillonite, and stirring for 45min at 800 r/min; and then cooling the mixed solution to 80 ℃, adding 0.5 part of alkylphenol polyoxyethylene ether and 3 parts of fatty alcohol polyoxyethylene ether into the reaction vessel, stirring at a constant temperature of 200r/min for 15min, standing and cooling to obtain the anti-aging permeable asphalt regenerant.
Example 2
According to the mass parts, mixing 88 parts of catalytic cracking slurry oil and residual oil according to the ratio of 2: adding the base oil prepared by 1 into a three-neck flask, adding 10 parts of compatibilizer obtained by compounding sulfonate and maleic anhydride into the base oil, stirring at the speed of 350r/min for 25min, and controlling the constant temperature during stirring at 120 ℃; after stirring, heating to 125 ℃, adding 3 parts of hydrotalcite into the mixture, and stirring for 53min at 900 r/min; and then cooling the mixed solution to 88 ℃, adding 0.8 part of alkylphenol polyoxyethylene ether and 4 parts of fatty alcohol polyoxyethylene ether into the reaction vessel, stirring at a constant temperature of 250r/min for 18min, standing and cooling to obtain the anti-aging permeable asphalt regenerant.
Example 3
According to the mass parts, 95 parts of catalytic cracking slurry oil and residual oil are mixed according to the ratio of 2: adding the base oil prepared by 1 into a three-neck flask, adding 12 parts of compatibilizer obtained by compounding sulfonate and maleic anhydride into the base oil, stirring for 30min at the speed of 400r/min, and controlling the constant temperature during stirring at 130 ℃; after stirring, heating to 130 ℃, adding 4 parts of hydrotalcite into the mixture, and stirring for 60min at 1000 r/min; and then cooling the mixed solution to 95 ℃, adding 1.2 parts of alkylphenol polyoxyethylene ether and 5 parts of fatty alcohol polyoxyethylene ether into the reaction vessel, stirring at a constant temperature of 300r/min for 20min, standing and cooling to obtain the anti-aging permeable asphalt regenerant.
Reference group
The asphalt regenerant without the anti-aging agent or the penetrant is used as a comparative example, the performance of the anti-aging penetration type asphalt regenerant prepared by the invention and the performance of the asphalt regenerant in the corresponding comparative example are tested, the test processes are all completed by strictly referring to relevant procedures, and the test results are shown in the following table.
Test method
The aged asphalt softening point sample was placed on a glass plate and the whole was immersed in a vessel containing a rejuvenating agent. After permeating for 2h at 120 ℃, taking out a softening point sample, slowly scraping the residual regenerant on the surface of the softening point sample by using a scraper, and evaluating the permeation performance of the regenerant by testing the softening point of the aged asphalt of the regenerated asphalt sample and a blank control group.
TABLE 1 anti-aging Properties of asphalt reclaimers
TABLE 2 penetration Properties of asphalt reclaimer
As can be seen from table 1, the viscosity ratio and the aging quality loss of the asphalt recycling agent in each example are significantly reduced compared to the asphalt recycling agent reference group without adding phyllosilicate, which indicates that the addition of phyllosilicate can effectively resist the aging effect of external conditions such as heat and oxygen on the asphalt recycling agent, and greatly improve the aging resistance. According to the data in table 2, it can be easily understood that the penetration of the asphalt recycling agent in the aged asphalt is continuously reduced as the aging degree of the asphalt is increased. The penetrating agent added into the regenerant can obviously improve the penetrating performance of the asphalt regenerant, and the asphalt regenerant can fully exert the effect even if the asphalt aging degree is severe.
Claims (7)
1. The anti-aging penetration type asphalt regenerant is characterized by being prepared from the following raw materials in parts by mass: 80-95 parts of base oil, 8-12 parts of a compatibilizer, 2-4 parts of an anti-aging agent, 0.5-1.2 parts of a wetting agent and 3-5 parts of a penetrating agent; the base oil is a mixture of catalytic cracking slurry oil and residual oil, and the aromatic content of the mixture of the catalytic cracking slurry oil and the residual oil is more than 70%; the compatibilizer is a mixture of an anionic surfactant and maleic anhydride; the anti-aging agent is phyllosilicate; the penetrating agent is a nonionic surfactant.
2. The aging-resistant penetration asphalt recycling agent as claimed in claim 1, wherein the base oil is a mixture of catalytic cracking slurry oil and residual oil according to a mass ratio of 2: 1.
3. The asphalt recycling agent of claim 1, wherein the anionic surfactant is sulfonate, the maleic anhydride is maleic anhydride, and the mass ratio of the sulfonate to the maleic anhydride is 1: 1.
4. The aging-resistant penetrating asphalt regenerant of claim 1, wherein the layered silicate is montmorillonite or hydrotalcite.
5. The asphalt recycling agent of claim 1, wherein the wetting agent is alkylphenol ethoxylates.
6. The asphalt recycling agent of claim 1, wherein the nonionic surfactant is fatty alcohol-polyoxyethylene ether.
7. A method for preparing the aging-resistant penetration asphalt recycling agent of any one of claims 1 to 6, which is characterized by comprising the following steps:
the method comprises the following steps: adding base oil into a reaction container, adding a compatibilizer at 110-130 ℃, and stirring at 300-400 r/min for 20-30 min to prepare a regenerant mother liquor preliminarily;
step two: the temperature is increased to 120 ℃ to 130 ℃, an anti-aging agent is added, and the mixture is stirred for 45min to 60r/min at the constant temperature of 800r/min to 1000 r/min;
step three: and (3) reducing the temperature of the solution to 80-95 ℃, then adding a wetting agent and a penetrating agent into the reaction vessel, stirring for 15-20 minutes at a constant temperature of 200-300 r/min, and standing and cooling to obtain the anti-aging penetrating asphalt regenerant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115768837A (en) * | 2020-06-09 | 2023-03-07 | 巴斯夫欧洲公司 | Regenerant for asphalt regeneration |
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