Silicon-based multi-component solvent type asphalt binder material, and preparation method and application thereof

Abstract

This invention relates to the field of modified asphalt technology, and discloses a silicon-based multi-component solvent-based asphalt binder material, its preparation method, and its application. The raw materials include the following parts by weight: 11-45 parts asphalt, 4-6 parts SBS, 0.5-5 parts silane coupling agent, 1-3 parts resin, and 50-75 parts ternary solvent. Compared to the toxic asphalt solvents used in existing technologies, this solution uses a combination of low-toxicity solvents to obtain the solvent for the asphalt binder material. However, considering the problem that the solubility and efficiency of low-toxicity organic solvents in asphalt are somewhat inferior to commonly used solvents for preparing asphalt binders (such as toluene and xylene), this solution combines several low-toxicity single solvents to form a highly efficient multi-component solvent, thereby enhancing the solubility of the raw materials and achieving the goal of replacing toluene and xylene in the preparation of asphalt binders, thus effectively improving the safety of asphalt production.

Description

Technical Field

[0001] This invention relates to the field of modified asphalt technology, specifically to a silicon-based multi-solvent asphalt binder, its preparation method, and its application. Background Technology

[0002] The bonding layer is an intermediate layer laid in road and bridge structures, serving as a "bridge" between the upper and lower layers. It primarily functions in two ways: firstly, it acts as a bond, firmly adhering the upper and lower layers together and enhancing the overall mechanical stability of the pavement structure; secondly, it acts as a waterproof layer, preventing water penetration into the lower structure and thus avoiding water damage. In practical road and bridge applications, bonding layers are mainly placed between cement concrete pavements and asphalt overlays, between old asphalt pavements and new asphalt overlays, between cement concrete bridge decks and asphalt overlays, and between steel bridge decks and asphalt overlays. The bonding layer has now become an indispensable part of road and bridge structures.

[0003] Currently, the solvents used in the preparation of solvent-based asphalt binders are mostly organic solvents such as toluene and xylene, which are toxic and harmful to human health and the environment, and do not conform to the concept of environmental protection and sustainable development. Furthermore, the solvent-based binders currently used still have mechanical defects such as slip failure, peeling and cracking, and poor resistance to shear slip under heavy traffic. In addition, the focus of attention on the binder is on its later road performance, while the bonding performance of the material itself is ignored. In fact, the initial bonding performance, sustained bonding ability, and interfacial bonding strength of the binder are all related to the overall performance of the binder.

[0004] Therefore, in view of the shortcomings of current research, and taking into account the toxicity of solvent-based bonding materials, the bonding performance of the materials themselves, and the key road performance of the bonding layer, it is of great practical significance to develop a new generation of low-toxicity and high-efficiency solvent-based asphalt base course bonding materials through in-depth research. This will promote the green and sustainable development of bonding layer technology in road and bridge engineering and improve the overall level of the industry. Summary of the Invention

[0005] The present invention aims to provide a silicon-based multi-solvent-based asphalt binder, its preparation method and application, in order to solve the technical problem that the solvent toxicity of existing asphalt binders is too high, which reduces their safety in use.

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

[0007] A silicon-based multi-component solvent-based asphalt binder comprises the following raw materials in parts by weight: 11-45 parts asphalt, 5.5-17 parts modifier, and 50-75 parts ternary solvent. The modifier includes a silane coupling agent, and the ternary solvent comprises the following raw materials in parts by volume: 1-5 cycloalkanes, 1-5 acetates, and 2-6 tetrahydrofuran.

[0008] Preferably, as an improvement, the modifier further includes SBS and resin; the modifier comprises the following raw materials in parts by weight: 0.5 to 5 parts silane coupling agent, 4 to 9 parts SBS, and 1 to 3 parts resin.

[0009] Preferably, as an improvement, the cycloalkane is any one of cyclohexane, cyclopentane, cyclohexane, and cycloheptane, and the acetate is any one of methyl acetate and ethyl acetate.

[0010] Preferably, as an improvement, the silane coupling agent is one or more combinations of alkoxysilane, vinylsilane, and epoxysilane.

[0011] Preferably, as an improvement, the alkoxysilane is one or more of TES and TMOS, the vinylsilane is one or more of A-121 and A-173, and the epoxysilane is one or more of KH-560 and A-186.

[0012] Preferably, as an improvement, the resin is a natural resin or a synthetic resin, including one or more combinations of terpenes, rosin, phenolic resins, and petroleum resins.

[0013] Preferably, as an improvement, this solution also provides a method for preparing a silicon-based multi-element solvent-based asphalt bonding material, comprising the following steps: adding materials measured according to the above proportions to a solvent, treating the mixture at 20–60°C and 0–300 rpm, and allowing it to fully dissolve and mix evenly to obtain the solvent-based asphalt bonding material.

[0014] Preferably, as an improvement, this solution also provides an application of a silicon-based multi-element solvent-based asphalt binder. The solvent-based asphalt binder prepared above is used on any base pavement for laying new asphalt pavement, wherein the base pavement includes any one of cement concrete pavement, old asphalt pavement, cement concrete bridge deck, or steel bridge deck, with a spreading rate of 0.4–1.4 kg / m². 2 .

[0015] The principles and advantages of this scheme are:

[0016] To address the issue of poor solvent safety, the applicant attempted to use low-toxicity solvents as alternatives. However, existing low-toxicity solvents suffer from solubility biases, failing to simultaneously achieve both low toxicity and good solubility. This solution combines a ternary solvent system, a modifier, and asphalt to form the bonding material. The ternary solvent system, combining three solvents, not only possesses low toxicity but also exhibits high solubility for asphalt, thereby contributing to improved overall bonding performance. Furthermore, this solution uses a combination of silane coupling agents, SBS, and resin as modifiers. When used in combination with asphalt, these effectively enhance the overall bonding performance of the bonding material. Moreover, their interaction with the ternary solvent system and asphalt creates a synergistic effect, effectively improving the bonding effect of the adhesive material to the skeleton material and the base pavement, thus enhancing the asphalt paving effect.

[0017] 1. Compared to the toxic asphalt solvents used in existing technologies, this solution employs a combination of low-toxicity solvents to obtain the solvent for asphalt binders. However, given the discrepancy between the solubility and efficiency of low-toxicity organic solvents in asphalt and commonly used solvents for preparing asphalt binders (such as toluene and xylene), this solution combines several low-toxicity single solvents to form a highly efficient multi-component solvent, thereby enhancing the solubility of raw materials and achieving the goal of replacing toluene and xylene in the preparation of asphalt binders, thus effectively improving the safety of asphalt production.

[0018] 2. This solution improves the initial bonding performance, sustained bonding ability, and interfacial bonding strength of solvent-based asphalt adhesives by adding silane coupling agents. It also enhances the material's resistance to water damage. Specifically, the principle behind silane coupling agents as tackifiers lies in their two types of groups (specifically silane-based (Si-OR) and organic functional groups (such as amino, methyl, and epoxy groups)): one group can bond with the bonded skeleton material, while the other can bond with polymeric materials or adhesives, thereby forming strong chemical bonds at the bonding interface and improving bonding strength.

[0019] 3. This method involves adding SBS, solid asphalt, and other additives to a ternary solvent system, allowing it to dissolve completely at room temperature or with appropriate heating, and then stirring and mixing it evenly to obtain a silicon-based multi-solvent asphalt binder. The resulting binder can significantly improve the adhesion and water resistance of asphalt and has extremely low toxicity.

[0020] 4. This solution utilizes the aforementioned bonding material on any base surface for new asphalt pavement, including cement concrete pavement, existing asphalt pavement, cement concrete bridge deck, or steel bridge deck. By limiting the application rate, it effectively enhances the bonding effect of the bonding material on the base surface and asphalt, thereby improving the performance of the newly laid asphalt pavement. Through long-term experiments, the applicant has found that insufficient application leads to poor quality asphalt in the bonding layer, resulting in a poor bonding effect; while excessive application of asphalt bonding material causes excessive capillary loss, reducing the actual amount of asphalt remaining in the bonding layer and hindering long-term adhesion. Attached Figure Description

[0021] Figure 1 The graph shows the performance comparison results of the silicon-based multi-solvent asphalt binder materials prepared in Examples 1-3 of this invention with different market products. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto. Unless otherwise specified, the technical means used in the following embodiments and experimental examples are conventional means well known to those skilled in the art, and the materials and reagents used can all be obtained commercially.

[0023] Overview of the Plan

[0024] This solution provides a silicon-based multi-component solvent-based asphalt binder, comprising the following raw materials in parts by weight: 11-45 parts asphalt, 5.5-17 parts modifier, and 50-75 parts ternary solvent.

[0025] As a reference, this solution provides a ternary solvent system comprising the following raw materials in parts by volume: 1–5 cycloalkanes, 1–5 acetates, and 2–6 tetrahydrofuran. The cycloalkanes are any one of cyclopentane, cyclohexane, and cycloheptane, and the acetates are any one of methyl acetate and ethyl acetate.

[0026] As a reference, this solution provides a modifier composition comprising the following raw materials in parts by weight: 0.5 to 5 parts of silane coupling agent, 4 to 9 parts of SBS, and 1 to 3 parts of resin. The silane coupling agent is one or more combinations of alkoxysilane, vinylsilane, and epoxysilane. The alkoxysilane is one or more combinations of TES and TMOS; the vinylsilane is one or more combinations of A-121 and A-173; and the epoxysilane is one or more combinations of KH-560 and A-186.

[0027] For reference, resin is a natural or synthetic resin, including one or more combinations of terpenes, rosin, phenolic resins, and petroleum resins.

[0028] This solution also provides a method for preparing a silicon-based multi-element solvent-based asphalt bonding material, comprising the following steps: adding materials measured in the above proportions to a solvent, treating the mixture at 20–60°C and 0–300 rpm, allowing it to fully dissolve, and stirring until homogeneous to obtain the solvent-based asphalt bonding material.

[0029] This solution also provides an application of a silicon-based multi-element solvent-based asphalt binder. This binder is applied to any base pavement for new asphalt road surfaces, including cement concrete pavement, old asphalt pavement, cement concrete bridge deck, or steel bridge deck, with a application rate of 0.4–1.4 kg / m². 2 .

[0030] This solution also provides a construction method for a silicon-based multi-element solvent-based asphalt binder, including the application of the aforementioned solvent-based asphalt binder to any scenario of paving new asphalt pavements, comprising the following steps:

[0031] Step 1: Clean the construction surface, removing dust, oil, and loose materials, ensuring the substrate is dry and flat. ；

[0032] Step 2: Use an asphalt sprayer to spray the bonding material to ensure a uniform coating thickness. ；

[0033] Step 3: After the coating is applied, wait for the solvent to evaporate before laying the material to be bonded (such as asphalt). Ensure that the bonding material is not completely dry before laying to achieve the best bonding effect. In this embodiment, the application rate of the solvent-based asphalt bonding material is specifically 0.6 kg / m³. 2 .

[0034] Step 4: Use a roller to compact the laid material to ensure that it is fully bonded to the asphalt bonding material.

[0035] Example 1

[0036] This embodiment provides a silicon-based multi-component solvent-based asphalt binder. The binder consists of 60 parts of a compound solvent with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran = 3:3:4, 30 parts of asphalt, 5 parts of SBS, 3 parts of KH-560, and 2 parts of C9 petroleum resin. The above materials are quantitatively added to the solvent and treated at 20–60°C and 0–300 rpm until fully dissolved and thoroughly mixed.

[0037] Example 2

[0038] The difference between this embodiment and Embodiment 1 is that no silane coupling agent is added (i.e., the amount of silane coupling agent used is 0 parts).

[0039] In this embodiment, 60 parts of a compound solvent with a solvent volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran = 3:3:4 were selected. 30 parts of asphalt, 6 parts of SBS, and 4 parts of C9 petroleum resin were also selected.

[0040] Example 3

[0041] The difference between this embodiment and Embodiment 1 is that the resin content is reduced.

[0042] In this embodiment, 60 parts of a compound solvent with a solvent volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran = 3:3:4 were selected. 30 parts of asphalt, 6 parts of SBS, 3 parts of KH-560, and 1 part of C9 petroleum resin were also selected.

[0043] Example 4

[0044] The difference between this embodiment and Example 1 is that the SBS content is reduced. In this embodiment, 60 parts of a compound solvent with a solvent volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran = 3:3:4 are selected. The other components are: 30 parts asphalt, 4 parts SBS, 3 parts KH-560, and 3 parts C9 petroleum resin.

[0045] Example 5

[0046] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 1:3:6.

[0047] Example 6

[0048] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 2:3:5.

[0049] Example 7

[0050] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 3:2:5.

[0051] Example 8

[0052] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 3:3:4.

[0053] Example 9

[0054] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 4:1:5.

[0055] Example 10

[0056] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 4:2:4.

[0057] Example 11

[0058] This embodiment provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 5:2:3.

[0059] Comparative Example 1

[0060] The difference between this comparative example and Example 1 is that there is an excessive amount of silane coupling agent.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 is that the amount of asphalt used is excessive.

[0063] Comparative Example 3

[0064] The difference between this comparative example and Example 1 is that the amount of resin used is excessive.

[0065] Comparative Example 4

[0066] The difference between this comparative example and Example 1 is that the solvent is toluene, xylene, or a combination of both. Refer to a commercially available pre-mixed asphalt binder, WA.

[0067] Comparative Example 5

[0068] This comparative example provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 6:1:3.

[0069] Comparative Example 6

[0070] This comparative example provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 6:2:2.

[0071] Comparative Example 7

[0072] This comparative example provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 7:1:2.

[0073] Comparative Example 8

[0074] This comparative example provides a ternary solvent system with a volume ratio of cyclohexane:ethyl acetate:tetrahydrofuran of 8:1:1.

[0075] Experimental Example 1: Effect of different volume ratios on the solubility of solvent in a ternary system

[0076] The ternary solvent system (e.g., Examples 5-11) was prepared by mixing raw materials (e.g., cyclohexane, ethyl acetate, and tetrahydrofuran) in different volumes, and its solubility combination parameters (including δ) were measured. d δ P δ H The results of the tests (δ) were obtained by comparing xylene with other compounds. See Table 1 for details.

[0077] Table 1. Solubility combination parameters under different volume ratios

[0078]

[0079]

[0080] Because asphalt is an extremely complex mixture, its solubility parameters cannot be accurately obtained. However, its overall solubility parameters are similar to those of xylene. Therefore, this paper uses xylene to approximate the solubility of No. 70 petroleum asphalt (17.8-18.2 (J / cm3)). 1 / 2 The solubility combination parameters of the ternary system solvent in this scheme are as follows: Experimental data show that, by comparing the solubility combination parameters with xylene, the solvent in the ternary system is very similar to that of No. 70 petroleum asphalt in terms of solubility parameters. Theoretically, they should have good solubility in asphalt, which would indirectly improve the performance of the binder material in this scheme. However, if one of the raw materials is in excess (taking cyclohexane as an example, comparative examples 5-8), the solubility of the resulting ternary system solvent will deviate more from the solubility of xylene, reducing the solubility of the remaining asphalt and thus reducing the performance of the prepared binder material.

[0081] Given that the aforementioned solvent combinations have similar solubility, they should theoretically all exhibit good solubility for asphalt. The applicant, through comprehensive analysis of various solubility combination parameters, further selected the following three formulation schemes as examples to conduct a solubility performance test on the ternary solvent system, demonstrating the solubility performance of the ternary solvent system for asphalt. The results are detailed in Table 2.

[0082] Table 2. Solvency of ternary solvents for No. 70 asphalt

[0083]

[0084] Experimental data shows that the ternary solvent system in this scheme exhibits high solubility, as determined by the solubility test data for asphalt. The optimal solubility is achieved when the solvent ratio is cyclohexane:ethyl acetate:tetrahydrofuran = 3:3:4. Since the solubility parameters of the solvents obtained from different combinations in this scheme are similar, it is hypothesized that other combinations of ternary solvents in this scheme also possess high solubility, given the good solubility of the three combinations mentioned above.

[0085] Experimental Example 2: Comparison of the properties of the produced adhesive materials

[0086] The performance of the solvent-based asphalt binders produced in Examples 1-4 and Comparative Examples 1-4 of this scheme was tested according to GB / T 4852-2002, GB / T 4851, and GB / T 16777. The results are shown in Table 3.

[0087] Table 3. Performance differences of solvent-based asphalt binders produced in Examples 1-4 and Comparative Examples 1-4

[0088] Example Initial tack performance results (ball number #) Holding power (min) Bond strength (MPa) Example 1 14 282 1.12 Example 2 12 238 0.90 Example 3 13 218 0.93 Example 4 13 266 0.88 Comparative Example 1 11 158 0.84 Comparative Example 2 12 137 0.82 Comparative Example 3 11 172 0.84 Comparative Example 4 - - 0.86

[0089] Experimental data show that changing the amount of any material in the adhesive will lead to a decrease in the adhesive strength to varying degrees. Compared with the performance of a solvent-based asphalt adhesive on the market, the adhesive material obtained by this solution after improving the solvent is even better than the existing technology, but it can reduce toxicity and make production safer.

[0090] Experimental Example 3: Effect of different temperatures on pull-out strength in asphalt-asphalt systems

[0091] Using existing SBS modified emulsified asphalt (abbreviated RB, a commercial product), asphalt binder (abbreviated WA, a commercial product), and the bonding material obtained in the examples as experimental objects, the pull-out strength of the experimental objects was tested under different temperatures (including 5℃, 25℃, and 60℃) and different systems (including asphalt-asphalt system, cement-asphalt system, and steel plate-asphalt system). The experimental results are recorded in Tables 4 to 6.

[0092] Table 4. Pull-out strength test results (MPa) of asphalt-asphalt systems at different temperatures.

[0093] Temperature (°C) 5 25 60 RB 1.33 0.56 0.07 WA 1.78 1.05 0.12 Example 1 2.03 1.32 0.22

[0094] Table 5. Pull-out strength test results (MPa) of cement-asphalt system at different temperatures.

[0095] Temperature (°C) 5 25 60 RB 1.37 0.63 0.09 WA 1.82 1.07 0.11 Implementation Column 1 2.05 1.35 0.17

[0096] Table 6. Pull-out strength test results (MPa) of steel plate-asphalt system at different temperatures.

[0097] Temperature (°C) 5 25 60 RB 1.41 0.69 0.12 WA 1.89 1.14 0.21 Example 1 2.21 1.38 0.26

[0098] Experimental data show that, compared with commonly used products RB and WA on the market, the bonding material produced by this method has better pull-out strength, thereby improving the stability and durability of asphalt paving on different road surfaces.

[0099] Experiment Example 4: Performance Comparison of Adhesive Materials from Different Market Products and This Solution

[0100] Using existing SBS modified emulsified asphalt (abbreviated RB, a commercial product), asphalt binder (abbreviated WA, a commercial product), and the bonding materials obtained in Examples 1-3 (corresponding abbreviations NA, NB, and NC) as experimental subjects, their initial tack, holding power, and bond strength were tested. The results are detailed in [link to results]. Figure 1 .

[0101] Experimental data show that the bonding materials prepared by different combinations of raw materials in this scheme are superior to existing SBS modified emulsified asphalt (RB) and asphalt adhesive (WA) in terms of initial tack, holding power and bonding strength, and have better bonding performance.

[0102] Experiment Example 4: Application Effects of Solvent-Based Asphalt Bonding Materials

[0103] Taking cement concrete pavement as an example, solvent-based asphalt binder was applied to any new asphalt pavement base pavement with multiple gradients of application rate (i.e., application rate) according to JT / T983-2015. The results are detailed in Table 7.

[0104] Table 7. Differences in the application effects of solvent-based asphalt binders produced in Example 1.

[0105] <![CDATA[Unit spreading amount (kg / m 2 )]]> Pull-out strength (MPa) Oblique shear strength (MPa) 0.4 1.22 1.45 0.6 1.34 1.55 0.8 1.29 1.48 1.0 1.15 1.38 1.2 1.01 1.21

[0106] Experimental data show that when the application rate of the adhesive material in this scheme is 0.6 kg / m³, 2 When the asphalt pavement is in this state, both the pull-out strength and shear strength are higher, effectively improving the performance of the asphalt pavement.

[0107] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A silicon-based multi-element solvent-based asphalt binder, characterized in that: The raw materials include the following parts by weight: 11-45 parts asphalt, 5.5-17 parts modifier and 50-75 parts ternary system solvent. The modifier includes silane coupling agent, SBS and resin. The modifier includes the following parts by weight: 0.5-5 parts silane coupling agent, 4-9 parts SBS and 1-3 parts resin. The solvent of the ternary system comprises the following raw materials in parts by volume: 1-5 cycloalkanes, 1-5 acetates, and 2-6 tetrahydrofuran; wherein the cycloalkanes are any one of cyclopentane, cyclohexane, and cycloheptane, and the acetates are any one of methyl acetate and ethyl acetate.

2. The silicon-based multi-element solvent-based asphalt binder according to claim 1, characterized in that: The silane coupling agent is one or more combinations of alkoxysilane, vinylsilane, and epoxysilane.

3. The silicon-based multi-element solvent-based asphalt binder according to claim 2, characterized in that: The alkoxysilane is one or more of TES and TMOS, the vinylsilane is one or more of A-121 and A-173, and the epoxysilane is one or more of KH-560 and A-186.

4. The silicon-based multi-element solvent-based bitumen binder according to claim 1, characterized in that: The resin is a natural or synthetic resin, including one or more combinations of terpenes, rosin, phenolic resins, and petroleum resins.

5. A method for preparing a silicon-based multi-element solvent-based asphalt binder, characterized in that: The process includes the following steps: adding the raw material described in any one of claims 1 to 4 to a solvent, treating it at 20 to 60°C and 0 to 300 rpm, and allowing it to fully dissolve and mix evenly to obtain a solvent-based asphalt bonding material.

6. An application of a silicon-based multi-solvent-based asphalt binder, characterized in that: The silicon-based multi-solvent asphalt binder according to any one of claims 1 to 5 is used on any base pavement for laying new asphalt pavement, wherein the base pavement includes any one of cement concrete pavement, old asphalt pavement, cement concrete bridge deck, or steel bridge deck, and the application rate is 0.4 to 1.4 kg / m². 2 .

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