An ultra-viscous high-strength emulsified asphalt tack coat for thin layer surfacing and a preparation method thereof

Abstract

This invention belongs to the field of polymer materials technology and discloses an ultra-viscous high-strength emulsified asphalt tack coat for thin-layer overlays and its preparation method. The ultra-viscous high-strength emulsified asphalt tack coat comprises ultra-viscous high-strength asphalt and an emulsion of emulsified ultra-viscous high-strength asphalt; the mass ratio of ultra-viscous high-strength asphalt to emulsion is 60~70:30~40; the ultra-viscous high-strength asphalt, by mass, comprises 100 parts asphalt, 6~10 parts SSIBS, and 2~4 parts 3-mercaptopropyltriethoxysilane. This invention first sulfonates SIBS to introduce sulfonated groups and controls a certain degree of sulfonation, then synergistically reacts with 3-mercaptopropyltriethoxysilane to synergistically increase the 24h and 168h storage stability and pull-out strength of the ultra-viscous high-strength emulsified asphalt tack coat, resulting in excellent storage stability and adhesion. When the obtained ultra-viscous high-strength emulsified asphalt tack coat is used between a thin-layer overlay and the original road surface, it exhibits excellent adhesion.

Description

Technical Field

[0001] This invention belongs to the field of asphalt material technology, specifically relating to an ultra-viscous, high-strength emulsified asphalt tack coat for thin-layer overlays and its preparation method. Background Technology

[0002] Ultra-thin asphalt overlay is a novel pavement structure technology with significant advantages in modern highway preventive maintenance engineering. It specifically refers to a fine-grained asphalt concrete ultra-thin structural layer with a total thickness not exceeding 2 cm after paving and compaction. Compared to traditional milling and repaving, and conventional thick overlays, ultra-thin overlays offer significant advantages such as thinness, material savings, fast construction speed, minimal traffic disruption, and low overall cost. Therefore, it is widely used in the routine maintenance and pre-treatment of defects on highways, municipal arterial roads, and national and provincial trunk roads. This technology can effectively repair early-stage defects such as minor rutting, cracks, potholes, and poor smoothness in the original pavement, significantly improving the anti-skid performance, noise reduction performance, and driving comfort of the pavement surface. Simultaneously, it can isolate the base pavement from external adverse factors such as rainwater, ultraviolet radiation, and temperature changes, delaying the aging and damage process of the pavement and greatly extending the overall service life of the road. It is currently the most core and widely used technical means in the green and precision maintenance system for highways. However, due to its extremely thin structural layer, the ultra-thin cover has higher requirements for the interlayer bonding material. If the interlayer bonding material is not strong enough, it is easy to cause the layers to fall off, resulting in peeling, which seriously affects the service life of the ultra-thin cover.

[0003] To improve the strength of the bonding layer material, engineers use modified asphalt with better performance or high-viscosity and high-elasticity modified asphalt for emulsification to obtain high-viscosity emulsified asphalt. However, in practical applications, it has been found that high-viscosity emulsified asphalt has the following problems: it is difficult to emulsify when the polymer modifier content in high-viscosity asphalt exceeds 5%. The polymer modifier is a large molecular group, and it is difficult to break the high-viscosity asphalt into 3~5μm particles during the shear emulsification process. Secondly, high-viscosity emulsified asphalt has poor storage stability and is prone to segregation. Finally, the bonding layer formed after the high-viscosity emulsified asphalt demulsifies has high internal strength, but poor adhesion to the original pavement aggregate, and is prone to adhesive failure at the interface.

[0004] Based on this, the technical problem that this invention needs to solve is: how to prepare an ultra-viscous, high-strength emulsified asphalt tack coat with excellent storage stability and adhesion. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-viscous, high-strength emulsified asphalt tack coat and its preparation method. This ultra-viscous, high-strength emulsified asphalt tack coat utilizes sulfonation of SIBS to introduce sulfonated groups, which then synergistically increase the storage stability and adhesion of the ultra-viscous, high-strength emulsified asphalt tack coat with 3-mercaptopropyltriethoxysilane.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A super-viscosity, high-strength emulsified asphalt tack coat, comprising super-viscosity, high-strength asphalt and an emulsion of emulsified super-viscosity, high-strength asphalt; the mass ratio of the super-viscosity, high-strength asphalt to the emulsion is 60-70:30-40; the super-viscosity, high-strength asphalt, by mass parts, comprises 100 parts asphalt, 6-10 parts SSIBS, and 2-4 parts 3-mercaptopropyltriethoxysilane.

[0008] The specific preparation method of the SSIBS is as follows:

[0009] Step 1: Prepare SIBS solution: Cut SIBS into small particles of about 2-5 mm, dry them, and dissolve them in anhydrous dichloromethane to prepare a 10% (w / v) SIBS / dichloromethane solution;

[0010] Step 2: Prepare acetylsulfuric acid solution: Prepare a mixed solution by mixing acetic anhydride and anhydrous dichloromethane at a volume ratio of 1:10. Then, slowly add 98% concentrated sulfuric acid to the mixed solution at a volume ratio of 1:3, stirring continuously during the addition process. The temperature of the mixed system should be controlled at 0~5℃.

[0011] Step 3: Keep the SIBS / dichloromethane solution at 38~40℃, and slowly add acetylsulphuric acid solution dropwise. The volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:2~4. The dropwise addition time is controlled at 20~30min. After the dropwise addition is completed, react at 38~40℃ for 5h to obtain SSIBS solution.

[0012] Step 4: Add anhydrous methanol to the SSIBS solution, lower the temperature to below 25°C, and filter and dry the precipitated product to obtain the SSIBS.

[0013] In this invention, the degree of sulfonation is the molar percentage of sulfonated styrene structural units in SSIBS relative to all styrene structural units, and the degree of sulfonation of the prepared SSIBS is approximately 10-15 mol%; the specific reaction equation for SSIBS is shown in Formula I.

[0014]

[0015] Formula I.

[0016] Preferably, the emulsion comprises, by weight, 7-15 parts emulsifier, 2-4 parts emulsifying aid, 5-10 parts sodium hydroxide, and 100 parts deionized water.

[0017] More preferably, the emulsifier is sodium dodecyl diphenyl ether disulfonate.

[0018] More preferably, the emulsifying aid is an emulsifying oil composite agent, specifically a boron-free and amine-free emulsifying oil composite agent based on polyisobutylene succinic anhydride technology.

[0019] Furthermore, this invention discloses a method for preparing the super-viscosity, high-strength emulsified asphalt tack coat oil as described above, specifically including the following steps:

[0020] Step 1: Heat the asphalt to 175~185℃, add SSIBS, and shear at 4000~6000r / min for 30~40min. Then add 3-mercaptopropyltriethoxysilane and stir for 1~2h to prepare super-viscosity high-strength asphalt. Cool it down to 160~165℃ for later use.

[0021] Step 2: Heat deionized water to 70~75℃, add emulsifier and emulsification aid and stir evenly, then add sodium hydroxide to adjust the pH of the system to 11~13 to obtain emulsion;

[0022] Step 3: Mix the super-viscous high-strength asphalt obtained in Step 1 and the emulsion obtained in Step 2 according to the mass ratio, and then shear and grind them in a colloid mill to obtain a mixture. Then, reduce the temperature of the mixture to 50~60℃ through a heat exchanger to obtain the super-viscous high-strength emulsified asphalt tack coat oil. The grinding disc spacing of the colloid mill is 0.4~0.5mm.

[0023] Finally, this invention discloses the application of the super-viscosity, high-strength emulsified asphalt tack coat oil described above in the preparation of ultra-thin overlays.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention first sulfonates SIBS to introduce sulfonated groups and controls a certain degree of sulfonation. Then, it works synergistically with 3-mercaptopropyltriethoxysilane to synergistically increase the 24h and 168h storage stability and pull-out strength of the super-viscosity high-strength emulsified asphalt tack coat, resulting in a super-viscosity high-strength emulsified asphalt tack coat with excellent storage stability and adhesion. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Product Information:

[0028] Asphalt: Esso 70# base asphalt;

[0029] SIBS: Purchased from Xi'an Ruixi Biotechnology Co., Ltd.

[0030] 3-Mercaptopropyltriethoxysilane: 3-Mercaptopropyltriethoxysilane KH580 produced by Hubei Fangde New Materials Co., Ltd., with a purity of 99%;

[0031] Sodium dodecyl diphenyl ether disulfonate: Sodium dodecyl diphenyl ether disulfonate produced by Tianmen Hengchang Chemical Co., Ltd., with a purity of 99%;

[0032] Emulsified oil compound: Emulsified oil compound produced by Shanghai Yucheng Chemical Co., Ltd., model ENABLE 9477.

[0033] In this invention, SSIBS was prepared in-house, and the degree of sulfonation of the prepared SSIBS was measured using FTIR infrared spectroscopy at 1006 cm⁻¹. -1 The characteristic absorption peak of the aromatic ring of sulfonated styrene in the vicinity is taken as the characteristic peak of sulfonation, with a value of 1365 cm⁻¹. -1 The characteristic absorption peak of the nearby polyisobutylene segment —CH3 was used as an internal standard, and the peak value was 699 cm⁻¹. -1 The characteristic absorption peaks of the aromatic ring of unsulfonated styrene in the vicinity were used as auxiliary characterization peaks. With increasing sulfonation degree, the ratio of A1006 to A1365 gradually increased, while the ratio of A699 to A1365 gradually decreased. A calibration relationship between the above peak area ratios and the degree of sulfonation was established using SSIBS samples whose sulfonation degree was determined by elemental analysis, and the degree of sulfonation of the SSIBS to be tested was calculated accordingly.

[0034] Example 1

[0035] A super-viscosity, high-strength emulsified asphalt tack coat, wherein the mass ratio of super-viscosity, high-strength asphalt to emulsion is 65:35;

[0036] By weight, the super-viscosity high-strength asphalt comprises 100 parts asphalt, 8 parts SSIBS and 3 parts 3-mercaptopropyltriethoxysilane; the emulsion comprises 11 parts emulsifier, 3 parts emulsifying aid, 7 parts sodium hydroxide and 100 parts deionized water.

[0037] The emulsifier is sodium dodecyl diphenyl ether disulfonate; the emulsifying aid is an emulsifying oil compound.

[0038] The preparation method is as follows:

[0039] Step 1: Prepare SIBS solution: Cut SIBS into small particles of about 4 mm, dry them, and then dissolve them in anhydrous dichloromethane to prepare a 10% (w / v) SIBS / dichloromethane solution.

[0040] Step 2: Prepare acetylsulfuric acid solution: Prepare a mixed solution by mixing acetic anhydride and anhydrous dichloromethane at a volume ratio of 1:10. Then, slowly add 98% concentrated sulfuric acid to the mixed solution at a volume ratio of 1:3, stirring continuously during the addition process. The temperature of the mixed system should be controlled at 3℃.

[0041] Step 3: Keep the SIBS / dichloromethane solution at 40℃, and slowly add acetylsulphuric acid solution dropwise. The volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:3. The dropwise addition time is controlled at 25 min. After the dropwise addition is completed, react at 40℃ for 5 h to obtain SSIBS solution.

[0042] Step 4: Add anhydrous methanol to the SSIBS solution, lower the temperature to below 25°C, and filter and dry the precipitated product to obtain the SSIBS. The degree of sulfonation is calculated to be approximately 12.6% by FTIR infrared spectroscopy.

[0043] Step 5: Heat the asphalt to 180℃, add SSIBS, and shear at 5000r / min for 35min. Then add 3-mercaptopropyltriethoxysilane and stir for 1h to prepare super-viscosity high-strength asphalt. Cool it down to 165℃ for later use.

[0044] Step 6: Heat deionized water to 70°C, add emulsifier and emulsification aid and stir evenly, then add sodium hydroxide to adjust the pH of the system to 12 to obtain the emulsion;

[0045] Step 7: Mix the super-viscous high-strength asphalt obtained in Step 5 and the emulsion obtained in Step 6 according to the mass ratio, and then shear and grind them through a colloid mill to obtain a mixture. Then, reduce the temperature of the mixture to 55°C through a heat exchanger to obtain the super-viscous high-strength emulsified asphalt tack coat.

[0046] Example 2

[0047] A super-viscosity, high-strength emulsified asphalt tack coat, wherein the mass ratio of super-viscosity, high-strength asphalt to emulsion is 70:30;

[0048] By weight, the super-viscosity high-strength asphalt comprises 100 parts asphalt, 6 parts SSIBS and 4 parts 3-mercaptopropyltriethoxysilane; the emulsion comprises 7 parts emulsifier, 4 parts emulsifying aid, 5 parts sodium hydroxide and 100 parts deionized water.

[0049] The emulsifier is sodium dodecyl diphenyl ether disulfonate; the emulsifying aid is an emulsifying oil compound.

[0050] The preparation method is as follows:

[0051] Step 1: Prepare SIBS solution: Cut SIBS into small particles of about 2 mm, dry them, and then dissolve them in anhydrous dichloromethane to prepare a 10% (w / v) SIBS / dichloromethane solution;

[0052] Step 2: Prepare acetylsulfuric acid solution: Prepare a mixed solution by mixing acetic anhydride and anhydrous dichloromethane at a volume ratio of 1:10. Then, slowly add 98% concentrated sulfuric acid to the mixed solution at a volume ratio of 1:3, stirring continuously during the addition process. The temperature of the mixed system should be controlled at 5℃.

[0053] Step 3: Keep the SIBS / dichloromethane solution at 38℃, and slowly add acetylsulphuric acid solution dropwise. The volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:3. The dropwise addition time is controlled at 20 min. After the dropwise addition is completed, react at 38℃ for 5 h to obtain the SSIBS solution.

[0054] Step 4: Add anhydrous methanol to the SSIBS solution, lower the temperature to below 25°C, and filter and dry the precipitated product to obtain the SSIBS. The degree of sulfonation is calculated to be approximately 12.6% by FTIR infrared spectroscopy.

[0055] Step 5: Heat the asphalt to 175℃, add SSIBS, and shear at 4000r / min for 40min. Then add 3-mercaptopropyltriethoxysilane and stir for 1h to prepare super-viscosity high-strength asphalt. Cool it down to 160℃ for later use.

[0056] Step 6: Heat deionized water to 75°C, add emulsifier and emulsification aid and stir evenly, then add sodium hydroxide to adjust the pH of the system to 11 to obtain the emulsion;

[0057] Step 7: Mix the super-viscous high-strength asphalt obtained in Step 5 and the emulsion obtained in Step 6 according to the mass ratio, and then shear and grind them through a colloid mill to obtain a mixture. Then, reduce the temperature of the mixture to 50°C through a heat exchanger to obtain the super-viscous high-strength emulsified asphalt tack coat.

[0058] Example 3

[0059] A super-viscosity, high-strength emulsified asphalt tack coat, wherein the mass ratio of super-viscosity, high-strength asphalt to emulsion is 60:40;

[0060] By weight, the super-viscosity high-strength asphalt comprises 100 parts asphalt, 10 parts SSIBS and 2 parts 3-mercaptopropyltriethoxysilane; the emulsion comprises 15 parts emulsifier, 2 parts emulsifying aid, 10 parts sodium hydroxide and 100 parts deionized water.

[0061] The emulsifier is sodium dodecyl diphenyl ether disulfonate; the emulsifying aid is an emulsifying oil compound.

[0062] The preparation method is as follows:

[0063] Step 1: Prepare SIBS solution: Cut SIBS into small particles of about 5mm, dry them, and then dissolve them in anhydrous dichloromethane to prepare a 10% (w / v) SIBS / dichloromethane solution;

[0064] Step 2: Prepare acetylsulfuric acid solution: Prepare a mixed solution by mixing acetic anhydride and anhydrous dichloromethane at a volume ratio of 1:10. Then, slowly add 98% concentrated sulfuric acid to the mixed solution at a volume ratio of 1:3, stirring continuously during the addition process. The temperature of the mixed system should be controlled at 0℃.

[0065] Step 3: Keep the SIBS / dichloromethane solution at 40℃, and slowly add acetylsulphuric acid solution dropwise. The volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:3. The dropwise addition time is controlled at 30 min. After the dropwise addition is completed, react at 40℃ for 5 h to obtain SSIBS solution.

[0066] Step 4: Add anhydrous methanol to the SSIBS solution, lower the temperature to below 25°C, and filter and dry the precipitated product to obtain the SSIBS. The degree of sulfonation is calculated to be approximately 12.6% by FTIR infrared spectroscopy.

[0067] Step 5: Heat the asphalt to 185℃, add SSIBS, and shear at 6000r / min for 30min. Then add 3-mercaptopropyltriethoxysilane and stir for 1h to prepare super-viscosity high-strength asphalt. Cool it down to 165℃ for later use.

[0068] Step 6: Heat deionized water to 70°C, add emulsifier and emulsification aid and stir evenly, then add sodium hydroxide to adjust the pH of the system to 13 to obtain the emulsion;

[0069] Step 7: Mix the super-viscous high-strength asphalt obtained in Step 5 and the emulsion obtained in Step 6 according to the mass ratio, and then shear and grind them through a colloid mill to obtain a mixture. Then, reduce the temperature of the mixture to 60°C through a heat exchanger to obtain the super-viscous high-strength emulsified asphalt tack coat.

[0070] Example 4

[0071] The process is largely the same as in Example 1, except that in step 3, the volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:2. The resulting SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 14.8%.

[0072] Example 5

[0073] The process is largely the same as in Example 1, except that in step 3, the volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:4. The resulting SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 10.3%.

[0074] Example 6

[0075] Similar to Example 1, the prepared SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 12.6%. The difference was that an equal amount of sodium dodecyl sulfonate was used instead of sodium dodecyl diphenyl ether disulfonate.

[0076] Example 7

[0077] Similar to Example 1, the prepared SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 12.6%. The difference was that an equal amount of deionized water was used instead of the emulsifying agent.

[0078] Comparative Example 1

[0079] It is largely the same as Example 1, except that an equal amount of SIBS is used to replace SSIBS.

[0080] Comparative Example 2

[0081] The process is largely the same as in Example 1, except that in step 3, the volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:1. The resulting SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 22.4%.

[0082] Comparative Example 3

[0083] Similar to Example 1, the prepared SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 12.6%. The difference was that an equal amount of deionized water was used instead of 3-mercaptopropyltriethoxysilane.

[0084] Comparative Example 4

[0085] Similar to Example 1, the prepared SSIBS was tested by FTIR infrared spectroscopy, and the degree of sulfonation was calculated to be approximately 12.6%. The difference was that an equal amount of γ-mercaptopropyltrimethoxysilane was used to replace 3-mercaptopropyltriethoxysilane.

[0086] Performance testing

[0087] The samples of each embodiment and comparative example were tested according to the following methods:

[0088] Evaporation residue index:

[0089] Softening point: T 0606-2011;

[0090] Dynamic viscosity at 60℃: T 0620 -2000;

[0091] Ductility at 5℃: T 0605-2011;

[0092] 24h and 168h storage stability: T0655-1993;

[0093] Pull-out strength: T0773-2025.

[0094] The relevant test results are shown in Table 1;

[0095] Table 1 Test Results

[0096]

[0097] Analysis of the data in Table 1 shows that:

[0098] 1. By comparing Examples 1 and 6 and 7, it can be seen that the sodium dodecyl diphenyl ether disulfonate and emulsifying oil composite agent used in this invention have better emulsification effect, thereby making the super viscous high-strength emulsified asphalt tack coat oil have better storage stability and pull-out strength.

[0099] 2. In Comparative Example 1, SIBS was not sulfonated, resulting in poor emulsification of the super-viscosity high-strength asphalt, leading to poor storage stability and pull-out strength. In contrast, the SSIBS obtained in Comparative Example 2 had excessive sulfonation, which significantly enhanced the hydrophilicity and water phase swelling of SSIBS, weakening its effective distribution in the asphalt phase and the performance of the residual polymer network, making it difficult for it to function. The various indicators of its evaporation residue were significantly lower than those of Example 1. This demonstrates that sulfonation of SIBS is extremely crucial, and the degree of sulfonation needs to be strictly controlled.

[0100] 3. As can be seen from the comparison of Example 1, Comparative Example 1 and Comparative Example 3, in the super-viscosity high-strength emulsified asphalt tack coat of the present invention, SSIBS and 3-mercaptopropyltriethoxysilane must be used simultaneously to synergistically improve the performance of the super-viscosity high-strength emulsified asphalt tack coat.

[0101] 4. Further observation of Comparative Example 4 shows that 3-mercaptopropyltriethoxysilane is a specific component used in this invention and cannot be replaced. Other silane coupling agents cannot work synergistically with SSIBS to increase the storage stability and pull-out strength of the super-viscosity high-strength emulsified asphalt tack coat.

[0102] The reasons and mechanisms for the above results may be as follows:

[0103] SSIBS, through graft modification, increases the ionic cluster -SO3H. During emulsification, the ionic cluster neutralizes the alkaline substances in the emulsion, forming a stable system. By controlling the degree of sulfonation, the ionomer elastomer retains the characteristics of traditional polymer elastomers and avoids the negative impact of polymer hydrolysis caused by excessive sulfonation.

[0104] The three ethoxy groups (-OC2H5) at the terminal of the 3-mercaptopropyltriethoxysilane molecule react with water to form a reactive silanol (-Si-OH). This silanol then undergoes a condensation reaction with the silanols (-Si-OH) or aluminols (-Al-OH) on the surface of aggregates (such as stone and mineral powder), forming strong Si-O-Si or Si-O-Al covalent bonds. This creates a robust organosilicon film on the aggregate surface, thereby improving tensile strength. Secondly, the other side of the molecule contains a mercaptopropyl group, a polar molecule containing SH. Its unsaturated bonds in the asphalt molecule form hydrogen bonds, a strong molecular force that contributes to the stability of emulsified asphalt.

[0105] In Comparative Example 4, 3-mercaptopropyltriethoxysilane was replaced with 3-mercaptopropyltrimethoxysilane. Although the molecular structures were similar, 3-mercaptopropyltrimethoxysilane reacted with water faster, which affected the stability of the emulsified asphalt system. In contrast, 3-mercaptopropyltriethoxysilane reacted with water at a moderate rate, and the hydrolysis reaction was relatively mild and lasted longer, resulting in a more stable emulsified asphalt.

[0106] The hydrophobic tail chain group of sodium dodecyl diphenyl ether disulfonate is a dodecyl chain (C 12 H 25 The presence of a diphenyl ether structure (two benzene rings connected by oxygen atoms) provides rigidity and steric hindrance, while the presence of two sodium sulfonate groups makes the emulsified system more stable.

[0107] The emulsifying oil compound is a boron-free and amine-free emulsifying oil compound based on polyisobutylene succinic anhydride technology. When used in combination with sodium dodecyl diphenyl ether disulfonate, it can further improve the emulsifying effect of sodium dodecyl diphenyl ether disulfonate.

[0108] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An ultra-viscous, high-strength emulsified asphalt tack coat characterized by, The super-viscosity high-strength emulsified asphalt tack coat comprises super-viscosity high-strength asphalt and an emulsion of emulsified super-viscosity high-strength asphalt; the mass ratio of the super-viscosity high-strength asphalt to the emulsion is 60~70:30~40; the super-viscosity high-strength asphalt, by mass parts, comprises 100 parts asphalt, 6~10 parts SSIBS and 2~4 parts 3-mercaptopropyltriethoxysilane. The specific preparation method of the SSIBS is as follows: Step 1: Prepare SIBS solution: Cut SIBS into small particles of about 2-5 mm, dry them, and dissolve them in anhydrous dichloromethane to prepare a 10% (w / v) SIBS / dichloromethane solution; Step 2: Prepare acetylsulfuric acid solution: Prepare a mixed solution by mixing acetic anhydride and anhydrous dichloromethane at a volume ratio of 1:

10. Then, slowly add 98% concentrated sulfuric acid to the mixed solution at a volume ratio of 1:3, stirring continuously during the addition process. The temperature of the mixed system should be controlled at 0~5℃. Step 3: Keep the SIBS / dichloromethane solution at 38~40℃, and slowly add acetylsulphuric acid solution dropwise. The volume ratio of acetylsulphuric acid solution to SIBS / dichloromethane solution is 1:2~4. The dropwise addition time is controlled at 20~30min. After the dropwise addition is completed, react at 38~40℃ for 5h to obtain SSIBS solution. Step 4: Add anhydrous methanol to the SSIBS solution, lower the temperature to below 25°C, and filter and dry the precipitated product to obtain the SSIBS.

2. The ultra-cohesive, high-strength emulsified asphalt tack coat of claim 1, wherein, The emulsion comprises, by mass parts, 7-15 parts emulsifier, 2-4 parts emulsifying aid, 5-10 parts sodium hydroxide, and 100 parts deionized water.

3. The ultra-cohesive, high-strength emulsified asphalt tack coat of claim 2, wherein, The emulsifier is sodium dodecyl diphenyl ether disulfonate.

4. The super-viscosity, high-strength emulsified asphalt tack coat according to claim 2, characterized in that, The emulsifying aid is an emulsifying oil composite agent, a boron-free and amine-free emulsifying oil composite agent based on polyisobutylene succinic anhydride technology.

5. A method for preparing the super-viscosity, high-strength emulsified asphalt tack coat as described in any one of claims 1 to 4, characterized in that, Specifically, the following steps are included: Step 1: Heat the asphalt to 175~185℃, add SSIBS, and shear at 4000~6000r / min for 30~40min. Then add 3-mercaptopropyltriethoxysilane and stir for 1~2h to prepare super-viscosity high-strength asphalt. Cool it down to 160~165℃ for later use. Step 2: Heat deionized water to 70~75℃, add emulsifier and emulsification aid and stir evenly, then add sodium hydroxide to adjust the pH of the system to 11~13 to obtain emulsion; Step 3: Mix the super-viscous high-strength asphalt obtained in Step 1 and the emulsion obtained in Step 2 according to the mass ratio, and then shear and grind them in a colloid mill to obtain a mixture. Then, reduce the temperature of the mixture to 50~60℃ through a heat exchanger to obtain the super-viscous high-strength emulsified asphalt tack coat oil. The grinding disc spacing of the colloid mill is 0.4~0.5mm.

6. The application of the ultra-viscous, high-strength emulsified asphalt tack coat as described in any one of claims 1 to 4 in the preparation of ultra-thin overlays.

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