CN114133756A - Preparation method of polyurethane and SBS (styrene butadiene styrene) composite modified asphalt - Google Patents
Preparation method of polyurethane and SBS (styrene butadiene styrene) composite modified asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 166
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 title claims abstract description 141
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 93
- 239000004814 polyurethane Substances 0.000 title claims abstract description 93
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 title claims description 108
- 239000003208 petroleum Substances 0.000 claims abstract description 37
- 239000000654 additive Substances 0.000 claims abstract description 27
- 230000000996 additive effect Effects 0.000 claims abstract description 27
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- 238000006757 chemical reactions by type Methods 0.000 claims description 12
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- 238000010438 heat treatment Methods 0.000 claims description 6
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- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical group OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
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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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- Chemical Kinetics & Catalysis (AREA)
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Abstract
A preparation method of polyurethane and SBS composite modified asphalt relates to a preparation method of modified asphalt. The method aims to solve the technical problems of large mixing amount of the modifier, poor high-temperature storage stability and easy segregation of the existing modified asphalt. The method comprises the following steps: firstly, weighing base petroleum asphalt, a styrene-butadiene-styrene block copolymer and a polyurethane reactive additive; secondly, adding the styrene-butadiene-styrene block copolymer into the matrix petroleum asphalt, and stirring for reaction to obtain an SBS modified asphalt matrix; and then adding the polyurethane reactive additive into the SBS modified asphalt matrix for reaction to obtain the polyurethane and SBS composite modified asphalt. Compared with the traditional SBS modified asphalt, the composite modified asphalt can exert the advantages of physical-chemical modification, thereby improving the high-temperature anti-rutting performance and the high-temperature storage stability, having the equivalent low-temperature anti-cracking performance and being applicable to the field of road engineering.
Description
Technical Field
The invention relates to a preparation method of modified asphalt.
Background
Asphalt is a necessary bonding material in road construction engineering, the requirement on the asphalt is continuously increased along with the development of highway traffic, the road performance of the asphalt material is improved through an asphalt modification technology, the service level and the service life of an asphalt road surface are improved, and the mainstream of the field of road engineering is realized currently. At present, asphalt is modified by a polymer represented by a styrene-butadiene-styrene block copolymer SBS, and for example, Chinese patent application No. 201810907069.0, namely modified asphalt, an asphalt modifier and a preparation method thereof, discloses an asphalt modifier formed by mixing rubber powder, a styrene-butadiene block copolymer, lignin, organic bentonite, rubber oil and polyurethane. And then mixing the asphalt modifier into the asphalt which is heated and in a mixed state to obtain the modified asphalt. The method belongs to physical modification, the modifier and the asphalt are mainly mixed and dissolved in a physical sense, no obvious chemical change occurs, and the defects of large mixing amount of the modifier, poor high-temperature storage stability and easy segregation exist in practical application.
Disclosure of Invention
The invention aims to solve the technical problems of large mixing amount of a modifier, poor high-temperature storage stability and easy segregation of the existing modified asphalt, and provides a preparation method of polyurethane and SBS composite modified asphalt, which can comprehensively improve the pavement performance of asphalt.
The preparation method of the polyurethane and SBS composite modified asphalt comprises the following steps:
firstly, weighing base petroleum asphalt, styrene-butadiene-styrene block copolymer (SBS) and polyurethane reactive additive;
secondly, heating the base petroleum asphalt to 165-175 ℃, adding styrene-butadiene-styrene block copolymer (SBS) into the base petroleum asphalt, and stirring for 15-30 min at the rotation speed of 1500-2000 rpm; then, the rotating speed is increased to 4000-5000 rpm, and stirring is continued for 1-1.5 hours to obtain an SBS modified asphalt matrix;
and thirdly, reducing the temperature of the SBS modified asphalt matrix to 140-150 ℃, adding a polyurethane reaction type additive, and stirring at the rotating speed of 3000-4000 rpm. During the stirring, the mixture was tested by Fourier transform infrared spectroscopy (FTIR) at a wavenumber of 2270cm-1And stopping stirring when the absorbance of the absorption peaks at the left and right parts does not change within 30min, and cooling to room temperature to obtain the polyurethane and SBS composite modified asphalt.
Furthermore, the mass of the styrene-butadiene-styrene block copolymer SBS is 1.5-2.5% of that of the base petroleum asphalt.
Furthermore, the mass of the polyurethane reaction type additive is 1.5-2.5% of that of the matrix petroleum asphalt.
Further, the styrene-butadiene-styrene block copolymer SBS is linear or star-shaped.
Further, the polyurethane reactive additive is liquid and has isocyanate as a reactive functional group.
The matrix petroleum asphalt adopted by the invention is a mixture consisting of hydrocarbon with complex components and oxygen, sulfur and nitrogen derivatives, has a large amount of saturated, cyclic or aromatic structures on the whole, and contains a small amount of heteroatom (such as sulfur, nitrogen and oxygen) functional groups. The polyurethane reactive additive exists in a liquid oligomer form, contains rich isocyanate end groups, has good affinity with asphalt on component composition layers, and chemically modifies the asphalt so that the polyurethane reactive additive reacts with functional groups such as pyrrole, indole, phenol, carboxylic acid and the like in asphalt molecules (mainly asphaltene and colloid) to form a chemical bonding structure of carbamate and carbamido, thereby establishing a covalent crosslinking network based on asphaltene components, forming a more stable internal structure in the asphalt and fundamentally improving the mechanical property of the asphalt material. Meanwhile, the advantages of SBS in the aspect of improving the low-temperature performance of the asphalt are combined, the mechanical performance and the road performance of the asphalt material are improved comprehensively, and the elastic polymer network and the molecular chain winding structure formed by the polyurethane and SBS composite modified asphalt overcome the defect of easy segregation. In addition, because the polyurethane reaction type modifier material belongs to a liquid type, the polyurethane reaction type modifier material is adopted to produce the modified asphalt, has the characteristics of simple production process, good modification effect, low production temperature, high economic benefit and the like, and can reduce energy consumption and reduce waste gas emission. The aim of using the least cost and exerting the maximum benefit is achieved, so that the ever-increasing traffic demands can be better met.
Drawings
FIG. 1 is an infrared spectrum of a mixture when stirred for 5min and 90min in the stirring in the step of example 1;
FIG. 2 is a graph of the results of the high temperature rutting factor test for base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 3 is a graph of creep stiffness for a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 4 is a graph of creep rates for a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 5 is a master graph of the dynamic shear modulus of a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 6 is a master graph of the phase angle of a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 7 is a graph comparing the difference in high temperature storage softening points of a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, and 4.2% SBS modified asphalt prepared in comparative example 1;
FIG. 8 is a graph comparing the softening points of a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, and comparative 2% SBS + 2% polyurethane prepared in comparative example 2.
Detailed Description
The following examples are used to demonstrate the beneficial effects of the present invention:
example 1: the preparation method of the polyurethane and SBS composite modified asphalt provided by the embodiment comprises the following steps:
weighing 900g of matrix petroleum asphalt, 18g of styrene-butadiene-styrene block copolymer (SBS) and 18g of polyurethane reactive additive; wherein the styrene-butadiene-styrene block copolymer is linear SBS produced by Liangrong rubber GmbH, Huizhou, and the trade mark is SBS 3501; the polyurethane reactive additive is liquid and takes isocyanate as an active functional group, and is produced by BASF corporation;
secondly, heating the base petroleum asphalt to 170 ℃, adding styrene-butadiene-styrene block copolymer (SBS) into the base petroleum asphalt, and stirring for 15min under the condition that the rotating speed is 1500 rpm; then, the rotating speed is increased to 4000rpm, and stirring is continued for 1h to obtain an SBS modified asphalt matrix;
thirdly, reducing the temperature of the SBS modified asphalt matrix to 145 ℃, adding the polyurethane reaction type additive, stirring at the rotating speed of 3000rpm, testing the mixture by adopting Fourier transform infrared spectroscopy (FTIR) in the stirring process, and showing an infrared spectrogram of the mixture when stirring for 5min and stirring for 90min as shown in figure 1, wherein the wave number in the infrared spectrum is 2270cm along with the reaction-1Gradually decreases absorption peak at (A); sampling under stirring for 90min and 120min, and finding infrared spectrum at wave number of 2270cm-1Absorbance value of absorption peak in the range of 30minNo change occurs, the isocyanate component of the polyurethane reactive additive is fully consumed at the moment, stirring is stopped, and the temperature is reduced to room temperature, so that the polyurethane and SBS composite modified asphalt is obtained and is marked as 2% SBS + 2% polyurethane.
Example 2: the preparation method of the polyurethane and SBS composite modified asphalt of the embodiment is different from the preparation method of the embodiment 1 in that in the step one, 900g of the matrix petroleum asphalt, 18g of the styrene-butadiene-styrene block copolymer (SBS) and 13.5g of the polyurethane reactive additive are weighed; otherwise, in the same manner as in example 1, the polyurethane and SBS modified asphalt was obtained and labeled as 2% SBS + 1.5% polyurethane.
Comparative example 1: the preparation method of the SBS modified asphalt reference sample of this example is performed according to the following steps:
firstly, weighing 900g of base petroleum asphalt and 37.8g of styrene-butadiene-styrene block copolymer (SBS);
secondly, heating the base petroleum asphalt to 170 ℃, adding styrene-butadiene-styrene block copolymer (SBS) into the base petroleum asphalt, and stirring for 15min under the condition that the rotating speed is 1500 rpm; and then increasing the rotating speed to 4000rpm, continuously stirring for 1h, and finally placing in a thermostat at the temperature of 170 ℃ to continuously swell for 60min to obtain SBS modified asphalt which is marked as 4.2% SBS modified asphalt.
The rutting factor (G × sin δ) levels in the temperature range of 58-70 ℃ for the corresponding PG grades were determined using a dynamic shear rheometer for the base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1, according to the method specified in ASTM D7175, as shown in fig. 2. As can be seen from fig. 2, the base petroleum asphalt exhibited the lowest rutting factor level, meaning a lower resistance to high temperature rutting deformation. The addition of the styrene-butadiene-styrene block copolymer with the addition amount of up to 4.2 percent obviously improves the capability of the asphalt material for resisting high-temperature rutting deformation, so that the 4.2 percent SBS modified asphalt presents higher rutting factor level. Compared with two composite modified asphalts of 2% SBS + 2% polyurethane and 2% SBS + 1.5% polyurethane, the rutting factor increases with the increase of the mixing amount of the polyurethane reaction type additive, which shows that the increase of the mixing amount of the polyurethane reaction type additive has obvious effect of improving the high temperature performance of the composite modified asphalts.
Comparing the rutting factor levels of the matrix asphalt and the 4.2 percent SBS modified asphalt at different temperatures, the rutting factor level of the polyurethane and the SBS composite modified asphalt exceeds the level of the 4.2 percent SBS modified asphalt. According to the use amount of the modifier, the polyurethane and SBS composite modified asphalt can exert good high-temperature performance under the condition of low modifier mixing amount, and has higher efficiency in the aspect of improving the high-temperature performance of the asphalt material.
The low temperature creep characteristics of the asphalt samples were tested using a Bending Beam Rheometer (BBR) according to the method specified in ASTM D6648 for base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1. The test temperature is selected to be-12 ℃ and-18 ℃, and the low-temperature performance of the asphalt test piece is evaluated by adopting creep stiffness and creep rate. FIG. 3 shows the creep stiffness of each sample at-12 ℃ and-18 ℃ and FIG. 4 shows the creep rate of each sample at-12 ℃ and-18 ℃. As can be seen from FIGS. 3 and 4, the addition of the SBS modifier increases the creep stiffness of the asphalt material at-12 ℃ and decreases the creep rate at each temperature. Higher creep stiffness and lower creep rate mean that the material is susceptible to low temperatures creating greater temperature stress within it and is less prone to relaxation, thereby increasing the risk of low temperature cracking. However 4.2% SBS modified bitumen at-18 ℃ exhibits in addition to lower creep stiffness, meaning that it is able to exert a greater advantage at lower temperatures. Compared with the base asphalt and the SBS modified asphalt, the polyurethane and SBS composite modified asphalt has equivalent creep stiffness level and higher creep speed rate compared with 4.2% SBS modified asphalt, which shows that the polyurethane and SBS composite modified asphalt has more advantages in low-temperature performance, and the composite modified asphalt has higher creep stiffness and higher creep speed rate due to the increase of the mixing amount of the polyurethane reaction type additive, which is consistent with the result that the asphalt material is hardened due to the addition of the polyurethane reaction type additive, and meanwhile, the composite modified asphalt has better low-temperature stress relaxation capability.
The samples were subjected to a temperature-frequency sweep test using a dynamic shear rheometer for a base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, 2% SBS + 1.5% polyurethane prepared in example 2, and 4.2% SBS modified asphalt prepared in comparative example 1, to obtain a dynamic shear modulus (| G) within the linear viscoelastic range of the asphalt samples*| and phase angle (δ), the scanning temperature is 0-84 ℃ (adjacent temperatures are 12 ℃ apart), and the scanning frequency range is 0.1-30 Hz. Wherein, the test at 0-36 ℃ adopts a space between a parallel plate with a diameter of 8mm and a plate with a diameter of 2mm, and the test at 48-84 ℃ adopts a space between a parallel plate with a diameter of 25mm and a plate with a diameter of 1 mm. A dynamic shear modulus and phase angle master curve based on a CAM (Christensen-Anderson-Marasteanu) model is constructed by taking 36 ℃ as a reference temperature and according to a time-temperature equivalence principle and a WLF (Williams-Landel-Ferry) equation, wherein the dynamic shear modulus master curve is shown in figure 5, and the phase angle master curve is shown in figure 6. From fig. 5, it can be seen that the dynamic shear modulus of the 4.2% SBS modified asphalt is significantly higher than that of the base asphalt in the low frequency (corresponding to high temperature) range, and is close to and less than that of the base asphalt in the high frequency (corresponding to low temperature) range. Therefore, SBS can effectively improve the hardness of the asphalt and improve the permanent deformation resistance under the high temperature condition. Compared with 4.2% SBS modified asphalt, the polyurethane and SBS composite modified asphalt show higher dynamic shear modulus in a low temperature range, and the composite modification scheme is more advantageous in improving high temperature performance. From the phase angle master curve of fig. 6, it can be seen that the 4.2% SBS modified asphalt exhibited comparable phase angle levels to the composite modified asphalt and was significantly lower than the base asphalt, indicating an increase in elastic response. As an indication of formation of an elastic network structure or entanglement of molecular chains in the polymer, is about 10-3～100Within the range of Hz reduced loading frequency, the main curve of the phase angle of each modified asphalt presents a remarkable platform area, and the typical characteristics of the polymer modified asphalt are shown.
The high temperature storage stability of the base petroleum asphalt, the 2% SBS + 2% polyurethane prepared in example 1 and the 4.2% SBS modified asphalt prepared in comparative example 1 were evaluated and the results are shown in FIG. 7. The difference in softening points between the upper and lower portions of the asphalt sample after being stored at a high temperature (163 ℃) for 48 hours was used as an index for evaluating the degree of separation, and the state of phase separation of the material was reflected. As can be seen from FIG. 7, 2% SBS + 2% polyurethane is significantly lower than 4.2% SBS, which indicates that the high temperature storage stability of the modified asphalt prepared by the polyurethane and SBS composite modification scheme is greatly improved.
From the above analysis, it can be known that, thanks to the spatial network reinforced structure formed by chemical-physical modification, the polyurethane and SBS composite modified asphalt can exert better high-temperature performance than the traditional SBS modified asphalt under the condition of lower modifier doping amount, has higher efficiency in the aspect of improving the high-temperature performance of the asphalt material, and has excellent high-temperature storage stability, and can effectively avoid the occurrence of segregation phenomenon. The polyurethane and SBS composite modified asphalt exhibited comparable creep stiffness levels and higher creep rates than the 4.2% SBS modified asphalt, indicating comparable performance in terms of low temperature performance.
Comparative example 2: the preparation method of the polyurethane and SBS composite modified asphalt comprises the following steps:
weighing 2 parts of 450g of matrix petroleum asphalt, 18g of styrene-butadiene-styrene block copolymer (SBS) and 18g of polyurethane reaction type additive; wherein the styrene-butadiene-styrene block copolymer is linear SBS produced by Liangrong rubber GmbH, Huizhou, and the trade mark is SBS 3501; the polyurethane reactive additive is liquid and takes isocyanate as an active functional group, and is produced by BASF corporation;
secondly, heating 450g of base petroleum asphalt to 170 ℃, adding styrene-butadiene-styrene block copolymer (SBS) into the base petroleum asphalt, and stirring for 15min under the condition that the rotating speed is 1500 rpm; then increasing the rotating speed to 4000rpm, continuously stirring for 1h, and finally placing in a thermostat at the temperature of 170 ℃ to continuously swell for 60min to obtain SBS modified asphalt, so as to obtain 4% SBS modified asphalt, and marking as 4% SBS modified asphalt;
thirdly, heating 450g of base petroleum asphalt to 145 ℃, adding the polyurethane reaction type additive, and stirring the mixture under the condition that the rotating speed is 3000rpm until the infrared spectrum wave number is 2270cm-1The absorbance of the absorption peak does not change within 30minDissolving to obtain 4% of polyurethane modified asphalt, and marking as 4% of polyurethane modified asphalt;
and fourthly, mixing the 4% SBS modified asphalt obtained in the second step with the 4% polyurethane modified asphalt obtained in the third step in equal proportion, stirring for 30min under the condition that the rotating speed is 3000rpm to obtain polyurethane and SBS composite modified asphalt, and marking the polyurethane as 2% SBS + 2% for comparison.
Comparative example 2 differs from example 1 in the procedure by preparing 4% urethane-modified asphalt and 4% urethane-modified asphalt separately from the base asphalt and mixing the two in equal proportions to produce comparative 2% SBS + 2% polyurethane.
The base petroleum asphalt, 2% SBS + 2% polyurethane prepared in example 1, and comparative 2% SBS + 2% polyurethane prepared in comparative example 2 were tested for softening points according to the protocol specified in road engineering asphalt and asphalt mix test protocols (JTG E20-2011), as shown in FIG. 8. As can be seen from fig. 8, the softening points of the composite modified asphalt prepared by the two schemes of example 1 and comparative example 2 are both significantly improved compared with that of the base asphalt, which means that the composite modification scheme significantly improves the high-temperature performance of the base asphalt. Meanwhile, it can be found that the softening point level of the 2% SBS + 2% polyurethane modified asphalt prepared in comparative example 2 is lower than that of the 2% SBS + 2% polyurethane modified asphalt prepared in example 1, indicating that the modification effect of comparative example 2 is inferior to that of example 1. The reason is mainly because the SBS modifier can be physically crosslinked with the polyurethane reactive additive after the polyurethane reactive additive is added, and participate in the reaction of the polyurethane reactive additive and asphalt molecules. This interaction is impaired if the two are prepared separately and then blended. Therefore, the effect of preparing the composite modified asphalt by separately preparing the SBS modified asphalt and the polyurethane modified asphalt and further by the method of blending in proportion is poorer than that of the method of the invention.
Claims (5)
1. A preparation method of polyurethane and SBS composite modified asphalt is characterized by comprising the following steps:
firstly, weighing base petroleum asphalt, a styrene-butadiene-styrene block copolymer and a polyurethane reactive additive;
secondly, heating the matrix petroleum asphalt to 165-175 ℃, adding the styrene-butadiene-styrene segmented copolymer into the matrix petroleum asphalt, and stirring for 15-30 min at the rotation speed of 1500-2000 rpm; then, the rotating speed is increased to 4000-5000 rpm, and stirring is continued for 1-1.5 hours to obtain an SBS modified asphalt matrix;
and thirdly, reducing the temperature of the SBS modified asphalt matrix to 140-150 ℃, adding a polyurethane reaction type additive, and stirring at the rotating speed of 3000-4000 rpm. During the stirring process, the mixture was tested by Fourier transform infrared spectroscopy, when the infrared spectrum was at a wavenumber of 2270cm-1And stopping stirring when the absorbance of the absorption peaks at the left and right parts does not change within 30min, and cooling to room temperature to obtain the polyurethane and SBS composite modified asphalt.
2. The method for preparing the composite modified asphalt containing polyurethane and SBS according to claim 1, wherein the SBS in the first step is 1.5-2.5% of the petroleum asphalt as the matrix.
3. The method for preparing the polyurethane and SBS composite modified asphalt according to the claim 1 or 2, wherein the mass of the polyurethane reactive additive in the step one is 1.5% -2.5% of that of the base petroleum asphalt.
4. The method for preparing the polyurethane and SBS composite modified asphalt according to the claim 1 or 2, wherein the styrene-butadiene-styrene block copolymer in the step one is linear or star-shaped.
5. The method for preparing polyurethane and SBS composite modified asphalt according to claim 1 or 2, wherein the polyurethane reactive additive in step one is liquid and isocyanate is used as reactive functional group.
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| CN115477852A (en) * | 2022-09-14 | 2022-12-16 | 武汉工程大学 | Regenerated SBS (styrene butadiene styrene) modified asphalt material based on polyurethane-glyceryl ether synergistic effect and preparation method thereof |
| CN116515308A (en) * | 2023-03-23 | 2023-08-01 | 山东交通学院 | Biomass charcoal/segmented copolymer modified asphalt loaded with nano materials, and preparation method and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114773612A (en) * | 2022-05-25 | 2022-07-22 | 山东高速集团有限公司创新研究院 | Polyamine-based hyperbranched polyurethane material grafted SBS (styrene butadiene styrene) and preparation method thereof, and high-viscosity high-elasticity asphalt and preparation method thereof |
| CN114773612B (en) * | 2022-05-25 | 2022-12-27 | 山东高速集团有限公司创新研究院 | Polyamine-based hyperbranched polyurethane material grafted SBS (styrene butadiene styrene) and preparation method thereof, and high-viscosity high-elasticity asphalt and preparation method thereof |
| CN115477852A (en) * | 2022-09-14 | 2022-12-16 | 武汉工程大学 | Regenerated SBS (styrene butadiene styrene) modified asphalt material based on polyurethane-glyceryl ether synergistic effect and preparation method thereof |
| CN116515308A (en) * | 2023-03-23 | 2023-08-01 | 山东交通学院 | Biomass charcoal/segmented copolymer modified asphalt loaded with nano materials, and preparation method and application thereof |
| CN116515308B (en) * | 2023-03-23 | 2024-04-30 | 山东金衢设计咨询集团有限公司 | Biomass charcoal/segmented copolymer modified asphalt loaded with nano materials, and preparation method and application thereof |
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