CN109486219B - Organic-coated nano titanium dioxide grafted SBS (styrene butadiene styrene) modified asphalt and preparation method thereof - Google Patents
Organic-coated nano titanium dioxide grafted SBS (styrene butadiene styrene) modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of modified asphalt, and particularly discloses organic-coated nano titanium dioxide grafted SBS modified asphalt and a preparation method thereof, wherein the modified asphalt comprises the following components in parts by weight: 90-100 parts of matrix asphalt, 3-5 parts of grafted SBS modifier, 2-3 parts of stabilizer and 1-3 parts of antioxidant; the grafted SBS modifier is prepared by grafting organic coated nano titanium dioxide on SBS. The organic coating nano titanium dioxide grafted SBS modified asphalt introduces polar groups and ultraviolet shielding agent nano silicon dioxide to SBS through grafting reaction, improves the ultraviolet radiation resistance of SBS and the compatibility of SBS and matrix asphalt, overcomes the problems of poor compatibility and easy sedimentation in the using process of inorganic ultraviolet shielding agent powder and SBS modified asphalt, and has excellent aging resistance.
Description
Technical Field
The invention belongs to the technical field of modified asphalt, and particularly relates to organic-coated nano titanium dioxide grafted SBS modified asphalt and a preparation method thereof.
Background
Asphalt pavement has the advantages of comfortable running, low energy consumption, easy maintenance and the like, and the proportion of the asphalt pavement in the highway construction is higher and higher. However, the common asphalt has poor high and low temperature performance, the pavement paved by the common asphalt is easy to have diseases such as ruts, pot holes and the like, the service life is short, and the common asphalt is extremely easy to damage under the condition of heavy-load traffic. To solve this problem, polymers are generally used to modify asphalt, thereby improving the road performance of asphalt mixtures. Among them, styrene-butadiene-styrene triblock copolymer (SBS) is a linear or star type block copolymer synthesized by using styrene and butadiene as monomers, and belongs to a typical thermoplastic elastomer. SBS can form network structure in asphalt through physical cross-linking action to obviously improve the high-temperature anti-rutting and low-temperature anti-cracking performance of asphalt, and becomes the most widely used asphalt modifier in the world. However, like most organic compounds, SBS modified asphalt is also subject to aging caused by high temperature, oxygen, ultraviolet radiation and the like during storage, transportation, paving and long-term service, thereby causing asphalt to harden and crack, and seriously reducing the pavement performance and service life of asphalt pavement. The ultraviolet light has short wavelength and high energy, has the most serious damage effect on the asphalt pavement and has more obvious influence on SBS. The main chemical bonds in the SBS modified asphalt comprise C ═ C bonds, C-H bonds and the like, and ultraviolet radiation can destroy most of the chemical bonds in the asphalt, so that the high and low temperature performance of the modified asphalt is reduced rapidly, the pavement is easy to generate diseases, and the service life of the asphalt pavement is greatly shortened.
The Chinese patent with publication number CN 102174269B discloses a magnalium-based double hydroxide aging-resistant SBS modified asphalt, wherein the magnalium-based double hydroxide has excellent shielding effect on ultraviolet rays and can improve the ultraviolet aging resistance of SBS modified asphalt, but because the magnalium-based double hydroxide is inorganic powder, the magnalium-based double hydroxide which is powdery on one hand has small apparent density and is suspended on the surface of SBS modified asphalt after being added into a reaction tank and is difficult to form uniform dispersion with SBS modified asphalt, on the other hand, the inorganic magnalium-based double hydroxide has poor compatibility with SBS modified asphalt, and the magnalium-based double hydroxide is easy to settle in SBS modified asphalt, thereby seriously affecting the ultraviolet protection effect of SBS modified asphalt.
Disclosure of Invention
In view of the above, the invention aims to provide an organic-coated nano titanium dioxide grafted SBS modified asphalt and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that the organic coating nano titanium dioxide grafted SBS modified asphalt comprises the following components in parts by weight: 90-100 parts of matrix asphalt, 3-5 parts of grafted SBS modifier, 2-3 parts of stabilizer and 1-3 parts of antioxidant; the grafted SBS modifier is prepared by grafting organic coated nano titanium dioxide on SBS.
Because the main chemical bonds in the SBS modified asphalt comprise C ═ C bonds, C-H bonds and the like, the energy of ultraviolet light in the range of 200-400 nm is generally higher than the energy required for causing the breakage of various chemical bonds on a polymer chain, the radiation of the ultraviolet light can destroy most of the chemical bonds in the asphalt, so that the high-low temperature performance of the modified asphalt is rapidly reduced, and the pavement is easy to generate diseases. The invention modifies SBS by grafting organic coating nanometer titanium dioxide on SBS, the coating agent and nanometer titanium dioxide particle surface generate chemical bonding, organic coating layer is formed on surface, under initiator action, organic coating nanometer titanium dioxide and SBS generate graft reaction, one end of coating agent and nanometer titanium dioxide cross-link, the other end and SBS form graft, graft SBS modifier is prepared, graft reaction introduces polar group and ultraviolet screening agent to SBS, improves SBS ultraviolet radiation resistance and SBS and substrate asphalt compatibility, overcomes problems of poor compatibility of inorganic ultraviolet screening agent powder and SBS modified asphalt and easy generation of sedimentation in use, the prepared graft SBS modifier has excellent ultraviolet absorption capacity, and simultaneously has good compatibility with substrate asphalt.
Preferably, the preparation process of the grafted SBS modifier comprises the following steps: preparing ethanol-water mixed solution by absolute ethanol and deionized water according to the volume ratio of 6:1, adding nano titanium dioxide into the ethanol-water mixed solution, uniformly mixing the solution in an ultrasonic crusher, stirring and heating the solution to 80 ℃, dropwise adding a coating agent into the solution, wherein the weight ratio of the coating agent to the nano titanium dioxide is 3:10, reacting for 3 to 5 hours, carrying out centrifugal separation, washing the precipitate with absolute ethanol and distilled water, and drying the precipitate at 100 ℃ for 24 hours to obtain organic coated nano titanium dioxide; dissolving SBS in a mixed solvent of trichloroethylene and butanone to obtain SBS solution, adding the organic coated nano titanium dioxide obtained in the step one into the SBS solution, uniformly mixing, dropwise adding dibenzoyl peroxide while stirring, wherein the dosage of dibenzoyl peroxide is 5% of SBS, and carrying out heat preservation reaction for 7 hours at 80 ℃; adding absolute ethyl alcohol into the reaction liquid until SBS is completely precipitated, filtering and drying to obtain a crude grafted SBS modifier; and (3) placing the crude grafted SBS modifier in a Soxhlet extractor filled with acetone for extraction for 24h, and drying the extracted product in vacuum at room temperature to obtain the purified grafted SBS modifier.
Preferably, the nano titanium dioxide is rutile phase titanium dioxide.
Preferably, the coating agent is 3-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane.
After 3-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane is fully hydrolyzed, Si-OCH on the product3Or Si-OCH2CH3Hydrolyzing to Si-OH, and easily carrying out chemical condensation on the Si-OH and silicon hydroxyl on the surface of the nano silicon dioxide particles to bring organic groups on the surface of the nano titanium dioxide particles; in the SBS grafting process, the initiator is decomposed to generate free radicals, the free radicals attack active hydrogen on SBS molecular chains to form chain free radicals, and carbon-carbon double bonds in organic groups on the surfaces of the nano titanium dioxide are opened to react with the free radicals of the SBS molecular chains to generate the grafted SBS modifier.
Preferably, the stabilizer comprises 1.2-1.7 parts of 4-aminobenzothiophene and 0.8-1.3 parts of diaminobenzamide.
Preferably, the antioxidant is one or more of flavonol, soy isoflavone and 7-methoxy flavanol.
Asphalt materials, in addition to being susceptible to photo-aging by ultraviolet light, are also subject to auto-oxidative aging when contacted with oxygen. The reactive groups in the bitumen molecule generate free radicals which react with oxygen to be further converted into hydroperoxide intermediates which are converted into carbonyl-functional components by labile decomposition. The flavonol, the soybean isoflavone and the 7-methoxy flavanol can inhibit active groups in asphalt molecules from generating free radicals, and simultaneously can quench the free radicals generated by the active groups in the asphalt aging process, so that the free radicals are prevented from reacting with oxygen molecules and being converted into hydroperoxide intermediates. The hydroperoxide intermediate on the one hand is converted into carbonyl-functional components by unstable decomposition and on the other hand the double bonds in the bitumen molecule are converted into carbonyl-containing functional groups by the action of the hydroperoxide, which leads to deep aged conversion of the bitumen into higher molecular weight components, losing ductility.
Preferably, the food further comprises 1-2 parts of glucomannan or arabinogalactan by weight.
The glucomannan and the arabinogalactan are biomass materials, and are non-toxic, harmless and pollution-free. The glucomannan and the arabinogalactan have a large number of active groups of hydroxyl, carboxyl and methoxyl, can react with carboxyl, sulfoxide and acid glycoside groups in the matrix asphalt, are well connected with the matrix asphalt to form a macromolecular chain, generate a steric hindrance effect, and can enable the grafted SBS modifier to be better dispersed in the asphalt; in addition, the glucomannan or the arabinogalactan can reduce hydroperoxide intermediates generated by the reaction of free radicals in asphalt molecules and oxygen molecules into inactive alcohols, thereby blocking the cyclic reaction of the hydroperoxide, serving as an auxiliary antioxidant and assisting the antioxidation of the antioxidant.
The invention also provides a preparation method of the organic coated nano titanium dioxide grafted SBS modified asphalt, which comprises the following steps:
weighing the following raw materials in parts by weight: 90-100 parts of matrix asphalt, 3-5 parts of grafted SBS modifier, 2-3 parts of stabilizer and 1-3 parts of antioxidant;
heating the base asphalt to 165-175 ℃, adding the grafted SBS modifier, the stabilizer and the antioxidant into the base asphalt according to the proportion, keeping the reaction temperature at 170-190 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.5-1 h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuously stirring for 2-3 h to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Preferably, the reaction temperature is kept in the second step, stirring is continued for 2-3 hours, then the glucomannan or the arabinogalactan is added into the mixture according to the parts by weight under the condition of low-speed stirring, and the mixture is uniformly stirred, so that the organic coated nano titanium dioxide grafted SBS modified asphalt is prepared.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the organic-coated nano titanium dioxide grafted SBS modified asphalt, the coating agent and the surface of nano titanium dioxide particles are chemically bonded, an organic coating layer is formed on the surface of the coating agent, under the action of an initiator, the organic-coated nano titanium dioxide and SBS are subjected to a grafting reaction, one end of the coating agent is crosslinked with the nano titanium dioxide, the other end of the coating agent and SBS form a graft, and the grafted SBS modifier is prepared, wherein a polar group and an ultraviolet shielding agent are introduced to the SBS through the grafting reaction, so that the ultraviolet radiation resistance of the SBS and the compatibility of the SBS and the matrix asphalt are improved, the problems that inorganic ultraviolet shielding agent powder is poor in compatibility with the SBS modified asphalt and sedimentation is easy to occur in the using process are solved, and the prepared grafted SBS modifier has excellent ultraviolet absorption capacity and good compatibility with the matrix asphalt;
2. according to the organic coating nano titanium dioxide grafted SBS modified asphalt, the grafting reaction introduces the polar group and the ultraviolet shielding agent nano silicon dioxide to SBS, and when the grafted SBS modifier is stably dispersed in the matrix asphalt under the stirring and colloid mill dispersing effects, the organic coating nano titanium dioxide chemically combined with SBS can be uniformly and stably dispersed in the SBS modified asphalt system without sedimentation; meanwhile, the organic coating nano titanium dioxide is uniformly and stably dispersed, so that the ultraviolet protection effect of the organic coating nano titanium dioxide on SBS modified asphalt can be better exerted, the degradation effect of ultraviolet light on SBS can be effectively avoided, and the ultraviolet aging resistance of SBS modified asphalt is obviously improved;
3. according to the organic coated nano titanium dioxide grafted SBS modified asphalt, the flavonol, the soybean isoflavone and the 7-methoxy flavanol can inhibit active groups in asphalt molecules from generating free radicals, and simultaneously can quench the free radicals generated by the active groups in the asphalt aging process, so that the free radicals are prevented from reacting with oxygen molecules and being converted into hydroperoxide intermediates, the hydroperoxide intermediates are not stably decomposed and converted into components containing carbonyl functional groups on one hand, and double bonds in the asphalt molecules are converted into carbonyl functional groups under the action of the hydroperoxide, so that the asphalt is deeply aged and converted into components with higher molecular weight, and the ductility is lost;
4. according to the organic coated nano titanium dioxide grafted SBS modified asphalt, the glucomannan and the arabinogalactan are both biomass materials, are non-toxic, harmless and pollution-free, have a large number of active groups of hydroxyl, carboxyl and methoxyl, can react with carboxyl, sulfoxide and acid glycoside groups in the matrix asphalt, and are well connected with the matrix asphalt to form a macromolecular chain, so that a steric hindrance effect is generated, and the grafted SBS modifier can be better dispersed in the asphalt; in addition, the glucomannan or the arabinogalactan can reduce a hydroperoxide intermediate generated by the reaction of free radicals in asphalt molecules and oxygen molecules into inactive alcohols, thereby blocking the circulation reaction of hydroperoxide, assisting the antioxidation of an antioxidant, realizing synergistic interaction and improving the anti-autoxidation performance of the whole modified asphalt system.
Detailed description of the invention
The technical solution of the present invention will be clearly and completely described below with reference to examples and comparative examples. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The preparation method of the grafted SBS modifier used in the following examples and comparative examples is as follows: preparing ethanol-water mixed solution by absolute ethanol and deionized water according to the volume ratio of 6:1, adding nano titanium dioxide into the ethanol-water mixed solution, uniformly mixing the solution in an ultrasonic crusher, stirring and heating the solution to 80 ℃, dropwise adding a coating agent into the solution, wherein the weight ratio of the coating agent to the nano titanium dioxide is 3:10, reacting for 3 to 5 hours, carrying out centrifugal separation, washing the precipitate with absolute ethanol and distilled water, and drying the precipitate at 100 ℃ for 24 hours to obtain organic coated nano titanium dioxide; dissolving SBS in a mixed solvent of trichloroethylene and butanone to obtain SBS solution, adding the obtained organic coated nano titanium dioxide into the SBS solution, uniformly mixing, dropwise adding an initiator while stirring, and carrying out heat preservation reaction at 80 ℃ for 7 hours; adding absolute ethyl alcohol into the reaction liquid until SBS is completely precipitated, filtering and drying to obtain a crude grafted SBS modifier; and (3) placing the crude grafted SBS modifier in a Soxhlet extractor filled with acetone for extraction for 24h, and drying the extracted product in vacuum at room temperature to obtain the purified grafted SBS modifier.
Example 1
Heating 90 parts of matrix asphalt to 165 ℃, adding 3 parts of grafted SBS modifier, 1.2 parts of 4-aminobenzothiophene, 0.8 part of diaminobenzamide and 1 part of flavonol into the matrix asphalt, keeping the reaction temperature at 170 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.5h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuously stirring for 2h to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Example 2
Heating 100 parts of matrix asphalt to 175 ℃, adding 5 parts of grafted SBS modifier, 1.7 parts of 4-aminobenzothiophene, 1.3 parts of diaminobenzamide and 3 parts of soybean isoflavone into the matrix asphalt, keeping the reaction temperature at 190 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 1h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuing stirring for 3h to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Example 3
Heating 95 parts of matrix asphalt to 170 ℃, adding 4 parts of grafted SBS modifier, 1.5 parts of 4-aminobenzothiophene, 1.5 parts of diaminobenzamide and 2 parts of 7-methoxy flavanol into the matrix asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuously stirring for 2.5h to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Example 4
Heating 95 parts of matrix asphalt to 170 ℃, adding 4 parts of grafted SBS modifier, 1.5 parts of 4-aminobenzothiophene, 1.5 parts of diaminobenzamide, 1 part of flavonol and 1 part of 7-methoxy flavanol into the matrix asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, continuously stirring for 2.5h, then adding 1 part of glucomannan into the mixture under low-speed stirring, and uniformly stirring to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Example 5
Heating 95 parts of matrix asphalt to 170 ℃, adding 4 parts of grafted SBS modifier, 1.5 parts of 4-aminobenzothiophene, 1.5 parts of diaminobenzamide, 1 part of soybean isoflavone and 1 part of 7-methoxy flavanol into the matrix asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, continuously stirring for 2.5h, then adding 2 parts of arabinogalactan into the mixture under low-speed stirring, and uniformly stirring to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
Comparative example 1
Heating 95 parts of base asphalt to 170 ℃, adding 4 parts of SBS modifier, 1.5 parts of 4-aminobenzothiophene, 1.5 parts of diaminobenzamide and 2 parts of 7-methoxy flavanol into the base asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuously stirring for 2.5h to obtain the SBS modified asphalt.
Comparative example 2
Heating 95 parts of base asphalt to 170 ℃, adding 4 parts of grafted SBS modifier into the base asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuing stirring for 2.5h to obtain the SBS modified asphalt.
Comparative example 3
Heating 95 parts of base asphalt to 170 ℃, adding 4 parts of SBS, 2 parts of nano titanium dioxide, 1.5 parts of 4-aminobenzothiophene, 1.5 parts of diaminobenzamide and 2 parts of 7-methoxy flavanol into the base asphalt, keeping the reaction temperature at 180 ℃, stirring for 0.5h, uniformly mixing the raw materials, grinding for 0.7h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, and continuously stirring for 2.5h to obtain the SBS modified asphalt.
The SBS's obtained in examples and comparative examples were subjected to aging test using an ultraviolet aging oven having an ultraviolet intensity of 1200uw/cm2The aging temperature is 60 ℃, and the aging time is 6 days. And then testing the softening point, the viscosity at 135 ℃ and the ductility at 5 ℃ of the SBS modified asphalt before and after aging respectively, wherein the softening point reflects the high-temperature deformation resistance of the asphalt, the viscosity reflects the high-temperature fluidity of the asphalt, and the ductility reflects the low-temperature crack resistance of the asphalt. The specific test results are shown in table 1.
TABLE 1 aging resistance test of SBS modified asphalt
From the comparison of the data, the softening point increase value, the viscosity increase value at 135 ℃ and the ductility reduction value at 5 ℃ before and after aging of the organic-coated nano titanium dioxide-grafted SBS modified asphalt of the examples 1-5 are all smaller than those of the comparative examples 1 and 3, so that the organic-coated nano titanium dioxide-grafted SBS modified asphalt has more excellent aging resistance than that of the pure SBS modified asphalt and the nano titanium dioxide and SBS blended modified asphalt. The softening point increase value, the viscosity increase value at 135 ℃ and the ductility reduction value at 5 ℃ of the organically coated nano titanium dioxide grafted SBS modified asphalt of the embodiments 1-5 before and after aging are all smaller than those of the comparative example 2, so that the addition of the stabilizer, the antioxidant, the glucomannan or the arabinogalactan can improve the aging resistance of the SBS modified asphalt under the combined action of the grafted SBS modifier.
Claims (2)
1. An organic coating nanometer titanium dioxide grafted SBS modified asphalt is characterized in that: the paint comprises the following components in parts by weight: 90-100 parts of matrix asphalt, 3-5 parts of a grafted SBS modifier, 2-3 parts of a stabilizer, 1-3 parts of an antioxidant and 1-2 parts of glucomannan or arabinogalactan; the grafted SBS modifier is prepared by grafting organic coated nano titanium dioxide on SBS; the nano titanium dioxide is rutile-phase titanium dioxide, the coating agent is 3-methacryloxypropyltrimethoxysilane or vinyltriethoxysilane, the stabilizer comprises 1.2-1.7 parts of 4-aminobenzothiophene and 0.8-1.3 parts of diaminobenzamide, and the antioxidant is one or more of flavonol, soybean isoflavone and 7-methoxy flavanol;
the preparation process of the grafted SBS modifier comprises the following steps: preparing ethanol-water mixed solution by absolute ethanol and deionized water according to the volume ratio of 6:1, adding nano titanium dioxide into the ethanol-water mixed solution, uniformly mixing the solution in an ultrasonic crusher, stirring and heating the solution to 80 ℃, dropwise adding a coating agent into the solution, wherein the weight ratio of the coating agent to the nano titanium dioxide is 3:10, reacting for 3 to 5 hours, carrying out centrifugal separation, washing the precipitate with absolute ethanol and distilled water, and drying the precipitate at 100 ℃ for 24 hours to obtain organic coated nano titanium dioxide; dissolving SBS in a mixed solvent of trichloroethylene and butanone to obtain SBS solution, adding the obtained organic-coated nano titanium dioxide into the SBS solution, uniformly mixing, dropwise adding dibenzoyl peroxide while stirring, wherein the dosage of the dibenzoyl peroxide is 5% of that of SBS, and carrying out heat preservation reaction at 80 ℃ for 7 hours; adding absolute ethyl alcohol into the reaction liquid until SBS is completely precipitated, filtering and drying to obtain a crude grafted SBS modifier; and (3) placing the crude grafted SBS modifier in a Soxhlet extractor filled with acetone for extraction for 24h, and drying the extracted product in vacuum at room temperature to obtain the purified grafted SBS modifier.
2. The method for preparing SBS modified asphalt grafted by organic coated nano titanium dioxide according to claim 1, is characterized by comprising the following steps:
weighing the following raw materials in parts by weight: 90-100 parts of matrix asphalt, 3-5 parts of grafted SBS modifier, 2-3 parts of stabilizer and 1-3 parts of antioxidant;
heating the substrate asphalt to 165-175 ℃, adding a grafted SBS modifier, a stabilizer and an antioxidant into the substrate asphalt according to a proportion, keeping the reaction temperature at 170-190 ℃, stirring for 0.5h to uniformly mix the raw materials, grinding for 0.5-1 h in a colloid mill, stopping the colloid mill, keeping the reaction temperature, continuously stirring for 2-3 h, then adding glucomannan or arabinogalactan into the mixture according to parts by weight under low-speed stirring, and stirring uniformly to obtain the organic coated nano titanium dioxide grafted SBS modified asphalt.
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| CN110499036B (en) * | 2019-09-29 | 2022-02-01 | 河北省交通规划设计研究院有限公司 | Nano modified asphalt and preparation method thereof |
| CN114456609A (en) * | 2020-11-09 | 2022-05-10 | 南通通沙沥青科技有限公司 | High-grade highway anti-aging heavy traffic asphalt and preparation method thereof |
| CN113150569B (en) * | 2021-04-22 | 2022-07-12 | 江阴市新远见工程有限公司 | Wear-resistant SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
| CN114591583B (en) * | 2022-04-19 | 2022-08-16 | 西南交通大学 | Heat-resistant reversible aging-resistant asphalt wax inhibitor, asphalt and preparation method thereof |
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