CN113583457A - Reaction-regenerated SBS (styrene butadiene styrene) modified asphalt and preparation method thereof - Google Patents
Reaction-regenerated SBS (styrene butadiene styrene) modified asphalt and preparation method thereof Download PDFInfo
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- CN113583457A CN113583457A CN202110832507.3A CN202110832507A CN113583457A CN 113583457 A CN113583457 A CN 113583457A CN 202110832507 A CN202110832507 A CN 202110832507A CN 113583457 A CN113583457 A CN 113583457A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 152
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 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 description 94
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 title description 93
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000012492 regenerant Substances 0.000 claims abstract description 12
- 125000005442 diisocyanate group Chemical group 0.000 claims abstract description 11
- 230000008439 repair process Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- SHKUUQIDMUMQQK-UHFFFAOYSA-N 2-[4-(oxiran-2-ylmethoxy)butoxymethyl]oxirane Chemical group C1OC1COCCCCOCC1CO1 SHKUUQIDMUMQQK-UHFFFAOYSA-N 0.000 claims description 19
- 239000010692 aromatic oil Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract description 9
- 238000011069 regeneration method Methods 0.000 abstract description 9
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 18
- 230000035515 penetration Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000008162 cooking oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polyurethanes Or Polyureas (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the field of road engineering material recycling and regeneration recycling, and particularly relates to a reaction-regenerated SBS modified asphalt and a preparation method thereof. The method comprises the following steps: 1) obtaining aged SBS modified asphalt, diisocyanate structural repair agent, diepoxy structural repair agent and asphalt regenerant; 2) heating the aged SBS modified asphalt to 140-160 ℃, then adding the asphalt regenerant at the stirring speed of 200-400rpm, and stirring; 3) sequentially adding the diisocyanate structure repairing agent and the diepoxy structure repairing agent into the mixture obtained in the step 2), and stirring and reacting at the temperature of 140-. The inventor finds that the simultaneous addition of the two repairing agents can avoid the excessively high softening point of the SBS modified asphalt to be close to the original asphalt, thereby ensuring the high-temperature performance, the low-temperature performance and the ductility of the SBS modified asphalt regenerated by reaction.
Description
Technical Field
The invention belongs to the field of road engineering material recycling and regeneration recycling, and particularly relates to a reaction-regenerated SBS modified asphalt and a preparation method thereof.
Background
Asphalt pavement is widely used in highway construction because of its advantages of smooth surface, no expansion joint, comfortable driving, low noise, easy construction and maintenance, etc. The common petroleum asphalt is mainly adopted to pave the road surface at home and abroad in the early stage, but the high-low temperature performance of the road surface is poor, the road surface is easy to have track, pit and crack and other diseases, and is easy to be seriously damaged particularly under the condition of heavy-load traffic, and the service life of the road surface is short. In order to prolong the service life of asphalt pavements, styrene and butadiene triblock thermoplastic elastomer (SBS) modified asphalt is applied to pavements from the nineties of the last century at home and abroad so as to improve the low-temperature crack resistance and high-temperature rutting resistance of the asphalt pavements.
Although the SBS modified asphalt has excellent high and low temperature performance, the modified asphalt pavement still receives the action of factors such as strong ultraviolet light, heat, oxygen and the like in the service process, so that the SBS modified asphalt is aged to cause pavement diseases, and the pavement also needs to be maintained or rebuilt, thereby generating a large amount of waste SBS modified asphalt mixture. The waste SBS modified asphalt mixture is recycled, so that a large amount of raw materials such as asphalt and stone can be saved, the influence of stone exploitation on the environment is reduced, the environment protection is facilitated, and the method has very remarkable social, economic and environmental benefits.
The cross-linked network structure formed by SBS in asphalt is the main reason that the modified asphalt has excellent high and low temperature performance. After the SBS modified asphalt is aged, the molecular structure of the modifier SBS is damaged, the original modification effect is lost, and the engineering performance of the SBS modified asphalt is deteriorated. In recent ten years, the regeneration of the aged SBS modified asphalt mainly adopts the traditional regeneration technology, such as directly adding organic oily components such as high aromatic hydrocarbon oil, waste vegetable oil, waste edible oil and illegal cooking oil, so as to supplement light components lost by the aging of the asphalt and improve the overall performance of the aged SBS modified asphalt. Although the technologies have better promotion effects on the characteristics of aged SBS modified asphalt, such as low temperature, fatigue and the like, the high-temperature performance and the adhesiveness of the regenerated SBS modified asphalt are difficult to reach or approach the performance level of the original SBS modified asphalt, so that the application of high-quality engineering of the reaction regenerated SBS modified asphalt is greatly limited.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a reaction-regenerated SBS modified asphalt and a preparation method thereof.
The technical scheme provided by the invention is as follows:
a preparation method of SBS modified asphalt regenerated by reaction comprises the following steps:
1) obtaining aged SBS modified asphalt, diisocyanate structural repair agent, diepoxy structural repair agent and asphalt regenerant;
2) heating the aged SBS modified asphalt to 140-160 ℃, adding an asphalt regenerant at a stirring speed of 200-400rpm, and stirring, wherein the weight percentage of the asphalt regenerant to the aged SBS modified asphalt is 4-6%;
3) sequentially adding the diisocyanate structure repairing agent and the diepoxy structure repairing agent into the mixture obtained in the step 2), and stirring and reacting at the temperature of 140-160 ℃ and the stirring speed of 200-400rpm to prepare the SBS modified asphalt regenerated by reaction, wherein the weight percentage of the diisocyanate structure repairing agent to the aged SBS modified asphalt is 1-1.5%, and the weight percentage of the diepoxy structure repairing agent to the aged SBS modified asphalt is 1-2%.
In the technical scheme, if the diisocyanate structure repairing agent is singly added, the softening point of the SBS modified asphalt regenerated by reaction is greatly increased, and the low-temperature performance is damaged. If the diepoxy structure repairing agent is singly added, the ductility of the SBS modified asphalt regenerated by the reaction is only improved. However, the inventor finds that the simultaneous addition of the two repairing agents can avoid the excessively high softening point of the SBS modified asphalt to approach the original asphalt, thereby ensuring the high-temperature performance, the low-temperature performance and the ductility of the SBS modified asphalt regenerated by reaction.
Specifically, the diisocyanate structural repair agent is 4, 4-diphenylmethane diisocyanate.
The invention utilizes the selective reaction capability of the isocyanate end group in the molecular structure of the 4, 4-diphenylmethane diisocyanate to bond the SBS oxidation degradation product part, promotes the molecular weight of the SBS modified asphalt regenerated by reaction to be increased, and simultaneously leads the high-temperature performance of the SBS modified asphalt regenerated by reaction to be obviously improved based on the steric hindrance of the benzene ring structure.
Specifically, the diepoxy structure repair agent is 1, 4-butanediol diglycidyl ether.
The invention utilizes the addition of 1, 4-butanediol diglycidyl ether and a common asphalt regenerant to promote the aged SBS modified asphalt to have higher fluidity at the regeneration processing temperature (150 ℃), and achieves the purpose of improving the low-temperature characteristic of the aged SBS modified asphalt through the physical and chemical interaction with the aged SBS modified asphalt.
Specifically, the asphalt regenerant is aromatic oil.
The preparation method of the SBS modified asphalt regenerated by reaction comprises the following specific steps:
1) weighing 100g of aged SBS modified asphalt, 1-1.5 g of 4, 4-diphenylmethane diisocyanate and/or 1-2 g of 1, 4-butanediol diglycidyl ether and 5g of aromatic oil according to the mass ratio of the raw materials for later use.
2) Heating the aged asphalt to 150 ℃, adding aromatic oil at a stirring speed of 200-400rpm, and stirring for 5 min;
3) and sequentially adding 4, 4-diphenylmethane diisocyanate and 1, 4-butanediol diglycidyl ether into the mixture, keeping the temperature and the stirring speed unchanged, and continuing to react for 5min to prepare the SBS modified asphalt regenerated by reaction.
The invention also provides the SBS modified asphalt regenerated by the preparation method of the SBS modified asphalt regenerated by the reaction.
The reactive compound and the common asphalt regenerant are utilized to carry out the synergistic regeneration on the aged SBS modified asphalt, so that the high-quality SBS modified asphalt which can be subjected to reaction regeneration and can be applied can be prepared, the high-performance recycling of the waste SBS modified asphalt mixture is realized, and the obvious engineering value, economic benefit and environmental benefit are achieved.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
In the invention, SBS modified asphalt (ductility at 5 ℃ of 36.8cm, softening point of 70.5 ℃, needle penetration at 25 ℃ of 48.3dmm and viscosity at 135 ℃ of 2.56 Pa.s) is put in a film oven (TFOT) for aging for 5h, and then the ultraviolet light intensity is 1300 mu W/cm-1And continuously irradiating for 14 days in an ultraviolet aging box (the wavelength of ultraviolet light is 365nm) at the temperature of 40 ℃ to obtain the aged SBS modified asphalt. The aging process mainly simulates the thermal aging of SBS modified asphalt in concrete mixing and paving and the aging process of SBS modified asphalt subjected to long-term ultraviolet radiation in the service process. After aging, the SBS modified asphalt had a 5 ℃ ductility of 6.6cm, a softening point of 61.8 ℃, a 25 ℃ penetration of 30.8dmm and a 135 ℃ viscosity of 4.04 pas. The aged SBS modified asphalt from this test was used in each of the following examples.
Example 1
100g of aged SBS modified asphalt heated to a molten state is weighed, after the temperature is stabilized at 150 ℃, 1g of 4, 4-diphenylmethane diisocyanate is added, and the mixture is stirred for 5min at a stirring speed of 300rpm, so that the SBS modified asphalt regenerated by reaction is prepared. The physical properties of the SBS modified asphalt regenerated by reaction were tested according to the test protocol for road engineering asphalt and asphalt mixture (JTJE20-2011), and the SBS modified asphalt regenerated by reaction had a softening point of 69.8 ℃, an ductility of 6.8cm at 5 ℃, a penetration of 29.2dmm at 25 ℃ and a viscosity of 4.21 Pa.s at 135 ℃.
The test results show that the 4, 4-diphenylmethane diisocyanate mainly has the effect of improving the softening point of the aged SBS modified asphalt, but has no effect of improving the low-temperature ductility and the working characteristics.
Example 2
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 1g of 1, 4-butanediol diglycidyl ether after the temperature is stabilized at 150 ℃, and continuously stirring at a stirring speed of 300rpm for 5min to prepare the SBS modified asphalt regenerated by reaction. The physical properties of the SBS modified asphalt regenerated by reaction were tested according to the test protocol for road engineering asphalt and asphalt mixture (JTJE20-2011), and the SBS modified asphalt regenerated by reaction had an extensibility of 18.9cm at 5 ℃, a softening point of 58.4 ℃, a penetration of 39.8dmm at 25 ℃ and a viscosity of 2.29 Pa.s at 135 ℃.
From the test results, the 1, 4-butanediol diglycidyl ether mainly has the effect of improving the low-temperature ductility and the working characteristics of the aged SBS modified asphalt, but can reduce the high-temperature performance of the aged SBS modified asphalt to a certain extent.
Example 3
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 1g of 4, 4-diphenylmethane diisocyanate at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 1g of 1, 4-butanediol diglycidyl ether after 5min, and continuously stirring for 5min to prepare the SBS modified asphalt regenerated by reaction. The physical properties of the reactively recycled SBS modified asphalt were tested according to road engineering asphalt and asphalt mixture testing protocol (JTJE20-2011), and the reactively recycled SBS modified asphalt had a ductility of 18.1cm at 5 ℃, a softening point of 67.2 ℃, a penetration of 34.6dmm at 25 ℃ and a viscosity of 3.02 Pa.s at 135 ℃.
From the test results, it can be seen that comparative examples 1 and 2, 4, 4-diphenylmethane diisocyanate and 1, 4-butanediol diglycidyl ether have complementary advantages in the regeneration of aged SBS-modified asphalt, and also improve the high and low temperature properties of the aged SBS-modified asphalt.
Example 4
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 1g of 4, 4-diphenylmethane diisocyanate at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 1.5g of 1, 4-butanediol diglycidyl ether after 5min, and continuously stirring for 5min to obtain the SBS modified asphalt regenerated by reaction. The physical properties of the SBS modified asphalt regenerated by reaction were tested according to the test protocol for road engineering asphalt and asphalt mixture (JTJE20-2011), and the SBS modified asphalt regenerated by reaction had a ductility at 5 ℃ of 23.3cm, a softening point of 65.1 ℃, a penetration at 25 ℃ of 42.4dmm, and a viscosity at 135 ℃ of 2.56 Pa.s.
From the test results, it can be seen that the increase in the amount of 1, 4-butanediol diglycidyl ether added in comparative example 3 further improves the low-temperature ductility and the working characteristics of the aged SBS-modified asphalt regenerated from 4, 4-diphenylmethane diisocyanate, without seriously deteriorating the high-temperature performance.
Example 5
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 1g of 4, 4-diphenylmethane diisocyanate at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 2g of 1, 4-butanediol diglycidyl ether after 5min, and continuously stirring for 5min to obtain the SBS modified asphalt regenerated by reaction. The physical properties of the reactively recycled SBS modified asphalt were tested according to road engineering asphalt and asphalt mixture testing protocol (JTJE20-2011), and the reactively recycled SBS modified asphalt had a ductility of 27.8cm at 5 ℃, a softening point of 63.5 ℃, a penetration of 46.5dmm at 25 ℃ and a viscosity of 2.21 Pa.s at 135 ℃.
From the test results, it can be seen that in comparative examples 3 and 4, with the further increase of the amount of the 1, 4-butanediol diglycidyl ether, the low-temperature performance and the working characteristics of the recycled modified SBS modified asphalt are improved, and the softening point can still be kept at a higher level.
Example 6
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 1.5g of 4, 4-diphenylmethane diisocyanate at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 2g of 1, 4-butanediol diglycidyl ether after 5min, and continuously stirring for 5min to obtain the SBS modified asphalt regenerated by reaction. The physical property test of the SBS modified asphalt regenerated by the reaction is carried out according to the test specification of road engineering asphalt and asphalt mixture (JTJE20-2011), and the SBS modified asphalt regenerated by the reaction has the ductility of 25.2cm at 5 ℃, the softening point of 65.8 ℃, the penetration of 34.9dmm at 25 ℃ and the viscosity of 2.83 Pa.s at 135 ℃.
From the test results, it can be seen that in comparative example 5, 4, 4-diphenylmethane diisocyanate mainly exhibits an inhibitory effect on the decrease in the high-temperature performance of the aged SBS-modified asphalt after the synergistic regeneration, under the action of the above two reactive compounds.
Example 7
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 5g of aromatic oil at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 1g of 4, 4-diphenylmethane diisocyanate after 5min, adding 1g of 1, 4-butanediol diglycidyl ether, and continuously stirring for 5min to obtain the SBS modified asphalt regenerated by reaction. The physical properties of the reactively recycled SBS modified asphalt were tested according to the road engineering asphalt and asphalt mixture test protocol (JTJE20-2011), and the reactively recycled SBS modified asphalt had a ductility of 24.5cm at 5 ℃, a softening point of 65.1 ℃, a penetration of 43.9dmm at 25 ℃ and a viscosity of 2.53Pa · s at 135 ℃.
From the test results, it can be seen that in comparative example 3, the aromatic oil mainly acts as a softening effect on the aged asphalt, so that the low temperature ductility and the working properties of the SBS modified asphalt regenerated by the synergistic reaction are improved.
Example 8
Weighing 100g of aged SBS modified asphalt heated to a molten state, adding 5g of aromatic oil at a stirring speed of 300rpm after the temperature is stabilized at 150 ℃, adding 1.5g of 4, 4-diphenylmethane diisocyanate after 5min, then adding 2g of 1, 4-butanediol diglycidyl ether, and continuing stirring for 5min to prepare the SBS modified asphalt regenerated by reaction. The physical properties of the reactively recycled SBS modified asphalt were tested according to the road engineering asphalt and asphalt mixture test protocol (JTJE20-2011), and the reactively recycled SBS modified asphalt had a ductility at 5 ℃ of 32.5cm, a softening point of 63.1 ℃, a penetration at 25 ℃ of 42.8dmm, and a viscosity at 135 ℃ of 2.13Pa · s.
From the test results, it can be seen that in comparative examples 6 and 7, under the synergistic effect of 4, 4-diphenylmethane diisocyanate, 1, 4-butanediol diglycidyl ether and aromatic oil, the high and low temperature performances of the aged SBS modified asphalt are improved to a degree close to the performance level of the original SBS modified asphalt.
As can be seen from the above examples, the effects of 4, 4-diphenylmethane diisocyanate and 1, 4-butanediol diglycidyl ether on the high and low temperature properties of aged SBS-modified asphalt are significantly different. If the dosage of a certain SBS molecular structure repairing agent is simply increased, the high-temperature performance or the low-temperature performance of the aged SBS modified asphalt can be improved unilaterally, but the effect of taking account of both the high-temperature performance and the low-temperature performance cannot be obtained. Therefore, 4-diphenylmethane diisocyanate and 1, 4-butanediol diglycidyl ether are used cooperatively, and aromatic oil is added to adjust the aged matrix asphalt component, so that the overall performance of the aged SBS modified asphalt can be promoted to be close to the original asphalt level, and the high-quality engineering application is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A preparation method of SBS modified asphalt regenerated by reaction is characterized by comprising the following steps:
1) obtaining aged SBS modified asphalt, diisocyanate structural repair agent, diepoxy structural repair agent and asphalt regenerant;
2) heating the aged SBS modified asphalt to 140-160 ℃, adding an asphalt regenerant at a stirring speed of 200-400rpm, and stirring, wherein the weight percentage of the asphalt regenerant to the aged SBS modified asphalt is 4-6%;
3) sequentially adding the diisocyanate structure repairing agent and the diepoxy structure repairing agent into the mixture obtained in the step 2), and stirring and reacting at the temperature of 140-160 ℃ and the stirring speed of 200-400rpm to prepare the SBS modified asphalt regenerated by reaction, wherein the weight percentage of the diisocyanate structure repairing agent to the aged SBS modified asphalt is 1-1.5%, and the weight percentage of the diepoxy structure repairing agent to the aged SBS modified asphalt is 1-2%.
2. The method of preparing reactively recycled SBS modified asphalt of claim 1, wherein: the diisocyanate structural repair agent is 4, 4-diphenylmethane diisocyanate.
3. The method of preparing reactively recycled SBS modified asphalt of claim 1, wherein: the di-epoxy structure repairing agent is 1, 4-butanediol diglycidyl ether.
4. The process for the preparation of reactively recycled SBS modified asphalt according to any one of claims 1 to 3, characterised in that: the asphalt regenerant is aromatic oil.
5. A reactively reclaimed SBS modified asphalt obtainable by the method of any one of claims 1 to 4.
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| CN115850983A (en) * | 2022-12-13 | 2023-03-28 | 湖南国信路面环保材料有限责任公司 | Composite regenerated SBS modified asphalt and preparation method thereof |
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| CN118620406A (en) * | 2024-06-27 | 2024-09-10 | 山西交通养护集团有限公司 | Compound dual-regeneration SBS modified asphalt and preparation method thereof |
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| CN115895285A (en) * | 2022-11-22 | 2023-04-04 | 湖南沿湖建设工程有限公司 | Dual-regeneration SBS (styrene butadiene styrene) modified asphalt and preparation method thereof |
| CN115850983A (en) * | 2022-12-13 | 2023-03-28 | 湖南国信路面环保材料有限责任公司 | Composite regenerated SBS modified asphalt and preparation method thereof |
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Application publication date: 20211102 |