A high viscosity non-emulsifying tack layer oil, its preparation and use

Abstract

The application belongs to the technical field of asphalt materials, and discloses a high-viscosity non-emulsified tack coat oil as well as a preparation method and application thereof. The high-viscosity non-emulsified tack coat oil comprises, in terms of mass fractions, 100 parts of tack coat asphalt, 40-80 parts of solvent and 3-5 parts of polymerization inhibitor. The tack coat asphalt comprises base asphalt, SBS and RET reactive elastomer terpolymer at a mass ratio of 100:2-4:3-6. The solvent comprises anhydrous tetrahydrofuran, limonene and octamethylcyclotetrasiloxane at a mass ratio of 100:60-100:10-20. The SBS and the RET reactive elastomer terpolymer are used to synergistically modify the base asphalt. The anhydrous tetrahydrofuran and the limonene are used in combination for the modified tack coat asphalt, which has the effect of synergistically increasing the solubility of the tack coat asphalt, so that the obtained tack coat oil has excellent flowability, permeability and high bonding strength and can be quickly dried, thereby reducing the risk of interlayer peeling of the ultra-thin overlay and improving the service life of the ultra-thin overlay.

Description

Technical Field

[0001] This invention belongs to the field of asphalt material technology, specifically relating to a high-viscosity non-emulsified tack coat oil, its preparation method, and its uses. Background Technology

[0002] Ultra-thin asphalt overlays are used for preventative maintenance of highway asphalt pavements. They effectively improve the pavement's skid resistance, enhance driving safety, reduce noise and improve driving comfort. They can also slow the development of pavement defects, thus extending the road's service life. However, ultra-thin asphalt overlays are prone to peeling during actual use. Once local interlayer adhesion fails, it can quickly develop into blocky detachment, thereby affecting the service life of the ultra-thin overlay.

[0003] In practical engineering, there are two technical solutions for interlayer bonding materials in ultra-thin overlays: one is an emulsified asphalt system, and the other is a diluted asphalt system, i.e., a non-emulsified system. The non-emulsified tack coat technology does not require specialized paving equipment during ultra-thin overlay construction, thus having greater potential for widespread application. However, the effectiveness of non-emulsified tack coats in interlayer bonding in thin overlays depends not only on the tack coat's own bonding strength but also on the contact area between the tack coat and the existing asphalt surface layer. Since the asphalt pavement surface has many micropores, theoretically, a highly fluid tack coat can penetrate these micropores, effectively increasing the contact area with the existing pavement and enhancing the bonding effect of the ultra-thin overlay. However, currently, the bonding strength and fluidity of most non-emulsified tack coats are still not ideal, which can still lead to interlayer delamination in ultra-thin overlays, affecting service life, and causing inconvenience due to excessively long drying times.

[0004] Therefore, the technical problem to be solved by this invention is: how to develop a non-emulsified tack coat oil with good fluidity, permeability and high bonding strength that can dry quickly, thereby reducing the risk of interlayer delamination of ultra-thin covers and thus improving the service life of ultra-thin covers. Summary of the Invention

[0005] The purpose of this invention is to provide a high-viscosity, non-emulsified tack coat oil. This tack coat oil utilizes a terpolymer of SBS and RET reactive elastomers to synergistically modify the base asphalt. Furthermore, anhydrous tetrahydrofuran and limonene are compounded for the modified tack coat oil, which synergistically increases the solubility of the tack coat oil. This results in a tack coat oil with excellent fluidity, permeability, and high bond strength, and it can dry quickly, thereby reducing the risk of interlayer delamination in ultra-thin overlays and improving the service life of ultra-thin overlays.

[0006] In addition, the present invention also provides a method for preparing the high-viscosity non-emulsified tack coat oil and its uses.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-viscosity non-emulsified tack coat oil, comprising the following components by weight: 100 parts tack coat asphalt, 40-80 parts solvent, and 3-5 parts polymerization inhibitor;

[0009] The tack coat asphalt comprises a base asphalt, SBS, and a RET reactive elastomer terpolymer; the mass ratio of the base asphalt, SBS, and RET reactive elastomer terpolymer is 100:2-4:3-6.

[0010] The solvents include anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane, wherein the mass ratio of the anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane is 100:60-100:12-17.

[0011] Preferably, the mass ratio of anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane in the solvent is 100:75-85:10-20.

[0012] Preferably, the polymerization inhibitor is diphenylamine.

[0013] Preferably, the base asphalt is heavy cross-linked 70# base asphalt.

[0014] Preferably, the SBS is linear SBS with a styrene content of 28-32%.

[0015] Furthermore, this invention discloses a method for preparing a high-viscosity non-emulsified tack coat oil as described above, comprising the following steps:

[0016] Step 1: Heat the base asphalt to 170-180℃, then add SBS, stir for 30-40 minutes, shear for 30-40 minutes, then add RET reactive elastomer terpolymer, stir for 30-40 minutes, and after stirring, the tack coat asphalt is obtained.

[0017] Step 2: Mix all components in the solvent in a sealed reaction vessel at room temperature and stir until homogeneous. Then heat the tack coat asphalt to 150-160℃ and add it to the solvent within 30-40 minutes. Stir during the addition process at a speed of 60-120 rpm. Control the system temperature at 25-60℃ throughout the addition process.

[0018] Step 3: After the tack coat asphalt is completely added to the solvent, stop stirring and wait for the temperature to drop to room temperature. Then add the polymerization inhibitor and stir at 60-120 rpm for 20-30 minutes. After stirring, the high-viscosity non-emulsified tack coat oil can be obtained.

[0019] Finally, the present invention also discloses the use of the high-viscosity non-emulsified tack coat oil as described above in the preparation of ultra-thin coatings.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The high-viscosity non-emulsified tack coat of the present invention utilizes a terpolymer of SBS and RET reactive elastomers to synergistically modify the base asphalt. Furthermore, anhydrous tetrahydrofuran and limonene are compounded for the modified tack coat asphalt, which synergistically increases the solubility of the tack coat asphalt. This results in a tack coat with excellent fluidity, permeability, and high bond strength, and it can dry quickly, thereby reducing the risk of interlayer delamination in ultra-thin overlays and improving the service life of ultra-thin overlays. Detailed Implementation

[0022] 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 skilled in the art without creative effort are within the scope of protection of the present invention. Reagents or instruments used that do not specify the manufacturer are all conventional products that can be purchased commercially.

[0023] Product Information:

[0024] Base asphalt: Fujian United Petrochemical Co., Ltd., 70# base asphalt;

[0025] SBS: YH791-H produced by Sinopec Baling Petrochemical Plant contains 30 wt% styrene.

[0026] RET reactive elastomer terpolymer: Dow EBA ELVALOY RET MF1178 (hereinafter abbreviated as RET);

[0027] Anhydrous tetrahydrofuran: purchased from Nantong Bona Chemical Technology Co., Ltd.;

[0028] Limonene: Purchased from Jiangxi Yuanshangcao Fragrance Co., Ltd., D-limonene (CAS 5989-27-5).

[0029] Octamethylcyclotetrasiloxane: purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0030] Diphenylamine: Purchased from Jinan Huifengda Chemical Co., Ltd.

[0031] Part One

[0032] The preparation methods for the following embodiments and comparative examples are shown below;

[0033] Step 1: Heat the base asphalt to 175°C, then add SBS, stir for 35 minutes, shear for 35 minutes, then add RET, stir for 35 minutes, and after stirring, the tack coat asphalt is obtained.

[0034] Step 2: Mix all components in the solvent in a sealed reaction vessel at room temperature and stir until homogeneous. Then heat the tack coat asphalt to 155°C and add it to the solvent within 35 minutes. Stir during the addition process at a stirring speed of 90 rpm. Control the system temperature at 25-60°C throughout the addition process.

[0035] Step 3: After the tack coat asphalt is completely added to the solvent, stop stirring and wait for the temperature to drop to room temperature. Then add the polymerization inhibitor and stir at 90 rpm for 25 minutes. After stirring, the high viscosity non-emulsified tack coat oil can be obtained.

[0036] The formulations of each embodiment and comparative example are shown in Table 1;

[0037] Table 1 Modified Asphalt Formulation (parts by weight)

[0038] Tack coat asphalt solvent diphenylamine Example 1 100 60 4 Example 2 100 40 5 Example 3 100 80 3 Example 4 100 60 4 Example 5 100 60 4 Comparative Example 1 100 60 4 Comparative Example 2 100 60 4 Comparative Example 3 100 60 4 Comparative Example 4 100 60 4 Comparative Example 5 100 60 4 Comparative Example 6 100 60 4 Comparative Example 7 100 60 4 Comparative Example 8 100 60 4 Comparative Example 9 100 60 4 Comparative Example 10 100 60 4

[0039] The specific composition of the solvent in Table 1 can be found in Table 2.

[0040] Table 2. Solvent Composition Details (parts by mass)

[0041] Example 1 Anhydrous tetrahydrofuran / 100 Limonene / 80 Octamethylcyclotetrasiloxane / 15 Example 2 Anhydrous tetrahydrofuran / 100 Limonene / 60 Octamethylcyclotetrasiloxane / 20 Example 3 Anhydrous tetrahydrofuran / 100 Limonene / 75 Octamethylcyclotetrasiloxane / 12 Example 4 Anhydrous tetrahydrofuran / 100 Limonene / 85 Octamethylcyclotetrasiloxane / 17 Example 5 Anhydrous tetrahydrofuran / 100 Limonene / 100 Octamethylcyclotetrasiloxane / 10 Comparative Example 1 0 Limonene / 180 Octamethylcyclotetrasiloxane / 15 Comparative Example 2 Anhydrous tetrahydrofuran / 180 0 Octamethylcyclotetrasiloxane / 15 Comparative Example 3 0 Furfural extract oil / 195 0 Comparative Example 4 n-Pentane / 100 Limonene / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 5 n-Pentane / 100 Furfural extract oil / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 6 n-Octane / 100 Turpentine / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 7 Cyclohexane / 100 Epoxidized soybean oil / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 8 Anhydrous tetrahydrofuran / 100 Limonene / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 9 Anhydrous tetrahydrofuran / 100 Limonene / 80 Octamethylcyclotetrasiloxane / 15 Comparative Example 10 Anhydrous tetrahydrofuran / 100 Limonene / 80 Octamethylcyclotetrasiloxane / 15

[0042] The specific composition of tack coat asphalt in Table 1 can be found in Table 3.

[0043] Table 3. Specific composition of tack coat asphalt (parts by weight)

[0044] Base asphalt SBS RET Example 1 100 3 5 Example 2 100 2 6 Example 3 100 4 3 Example 4 100 3 5 Example 5 100 3 5 Comparative Example 1 100 3 5 Comparative Example 2 100 3 5 Comparative Example 3 100 3 5 Comparative Example 4 100 3 5 Comparative Example 5 100 3 5 Comparative Example 6 100 3 5 Comparative Example 7 100 3 5 Comparative Example 8 100 8 0 Comparative Example 9 100 0 8 Comparative Example 10 100 3 Polyethylene / 5

[0045] Performance testing

[0046] The high-viscosity non-emulsified tack coats prepared in each embodiment and comparative example were subjected to the following tests;

[0047] Refer to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG 3410-2025;

[0048] Rotational viscosity test: T0621-2025;

[0049] 24-hour storage stability test: T0655-1993;

[0050] Pull-out strength: American standard AASHTO T361-16;

[0051] Mixture drawing: T0773-2025;

[0052] Shear strength: T0772-2025;

[0053] Drying time: GB / T 16777-2008.

[0054] The relevant test results are shown in Table 4.

[0055] Table 4. Test Results Data

[0056]

[0057] Analysis of Table 4 shows that, as can be seen from Examples 1 and Comparative Examples 1-7, anhydrous tetrahydrofuran and limonene in the solvent are the key components of the high-viscosity non-emulsified tack coat of the present invention. Only by using these two components simultaneously can the high-viscosity non-emulsified tack coat have better rotational viscosity, storage stability, strength and faster drying time.

[0058] The solvent in Comparative Example 1 lacked anhydrous tetrahydrofuran, resulting in a drying time of 4.3 hours, significantly longer than the 0.9 hours in Example 1. This is likely because while limonene can effectively dissolve the base asphalt and SBS, its extremely slow evaporation rate leads to prolonged drying time and a slow increase in the strength of the tack coat, causing inconvenience in construction. The solvent in Comparative Example 2 also lacked limonene, rendering it unprocessable. This is likely because while anhydrous tetrahydrofuran has a strong ability to dissolve asphalt quickly and is highly volatile, its solubility for SBS and RET is generally poor, especially for SBS. Using only anhydrous tetrahydrofuran cannot effectively dissolve the tack coat, and its low boiling point causes boiling during production, making the high-viscosity non-emulsified tack coat unprocessable. Therefore, this experiment was considered a failure.

[0059] Comparative Example 3 used only furfural extract oil as a solvent. This may be because although furfural extract oil has good solubility in the matrix bitumen, it is basically non-volatile, which leads to a significant increase in drying time, exceeding 10 hours, resulting in extremely high rotational viscosity and a significant reduction in strength.

[0060] Comparative Examples 4-7 used n-pentane, n-isooctane, or cyclohexane instead of anhydrous tetrahydrofuran, and furfural extract, turpentine, or epoxidized soybean oil instead of limonene. The resulting products showed poor stability, significantly worse than in Example 1. Furthermore, the drying times of Comparative Examples 5 and 7 were >10 hours, and the strength of Comparative Example 6 was reduced. This indicates that the anhydrous tetrahydrofuran and limonene of this invention are irreplaceable. Only by combining these two components can a high-viscosity non-emulsified tack coat oil achieve better rotational viscosity, storage stability, strength, and faster drying time.

[0061] As can be seen from Examples 1 and Comparative Examples 8-10, the tack coat asphalt and solvent of the present invention need to be combined. The lack of RET in the tack coat asphalt of Comparative Example 8 leads to a significant reduction in the storage stability of the finished product; the lack of SBS in the tack coat asphalt of Comparative Example 9 leads to a significant reduction in the strength of the finished product; and the use of polyethylene to replace RET in Comparative Example 10 also results in a decrease in the stability of the finished product. In other words, the tack coat asphalt and solvent in the high-viscosity non-emulsified tack coat of the present invention need to be specifically combined. The tack coat asphalt is the foundation, and only when it contains SBS and RET can a high-viscosity non-emulsified tack coat with good performance be prepared. On this basis, the specific solvent of the present invention is added to ensure the preparation of a high-viscosity non-emulsified tack coat with good performance.

[0062] 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. A high-viscosity, non-emulsified tack coat oil, characterized in that, By mass, it includes the following components: 100 parts tack coat bitum, 40-80 parts solvent, and 3-5 parts polymerization inhibitor; The tack coat asphalt comprises a base asphalt, SBS, and a RET reactive elastomer terpolymer; the mass ratio of the base asphalt, SBS, and RET reactive elastomer terpolymer is 100:2-4:3-6. The solvents include anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane, wherein the mass ratio of the anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane is 100:60-100:10-20.

2. The high-viscosity non-emulsified tack coat oil according to claim 1, characterized in that, The mass ratio of anhydrous tetrahydrofuran, limonene, and octamethylcyclotetrasiloxane in the solvent is 100:75-85:12-17.

3. The high-viscosity non-emulsified tack coat oil according to claim 1, characterized in that, The polymerization inhibitor is diphenylamine.

4. The high-viscosity non-emulsified tack coat oil according to claim 1, characterized in that, The base asphalt is heavy cross-linked 70# base asphalt.

5. The high-viscosity non-emulsified tack coat oil according to claim 1, characterized in that, The SBS mentioned is linear SBS with a styrene content of 28-32%.

6. A method for preparing a high-viscosity non-emulsified tack coat oil as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Heat the base asphalt to 170-180℃, then add SBS, stir for 30-40 minutes, shear for 30-40 minutes, then add RET reactive elastomer terpolymer, stir for 30-40 minutes, and after stirring, the tack coat asphalt is obtained. Step 2: Mix all components in the solvent in a sealed reaction vessel at room temperature and stir until homogeneous. Then heat the tack coat asphalt to 150-160℃ and add it to the solvent within 30-40 minutes. Stir during the addition process at a speed of 60-120 rpm. Control the system temperature at 25-60℃ throughout the addition process. Step 3: After the tack coat asphalt is completely added to the solvent, stop stirring and wait for the temperature to drop to room temperature. Then add the polymerization inhibitor and stir at 60-120 rpm for 20-30 minutes. After stirring, the high-viscosity non-emulsified tack coat oil can be obtained.

7. Use of the high-viscosity non-emulsified tack coat oil as described in any one of claims 1-5 in the preparation of ultra-thin coatings.

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