Highly viscous and highly tough composite seal coat material and preparation method thereof

Abstract

The application provides a high-viscosity and high-toughness composite seal coat material and a preparation method thereof, which comprises a bonding layer material and a surface functional layer material. The surface functional layer material is composed of the following raw materials: matrix emulsified asphalt, dehydrogenated rosin-based isothiocyanate, 3-hydroxy-3-phenylpropyl acetate, 2,6-di-tert-butyl-p-cresol, poly-p-phenylene-benzobisoxazole fiber, cationic polyacrylamide, aggregate and water. In the application, the bonding layer material is used for enhancing the interlayer bonding force and high-temperature stability; the surface functional layer material is used for enhancing the pavement flexibility, anti-skid performance, wear resistance and durability, and purifying automobile exhaust. The application can improve the durability of the preventive maintenance road and reduce environmental pollution.

Description

Technical Field

[0001] This invention belongs to the field of road engineering technology and relates to road maintenance and sealing materials, specifically to a high-viscosity and high-toughness composite sealing material and its preparation method. Background Technology

[0002] Currently, my country faces a massive scale of road maintenance and an urgent, heavy workload, highlighting the increasing importance of preventative maintenance technologies. Preventative maintenance composite seal technology, with its advantages such as rapid traffic reopening, energy efficiency, environmental friendliness, and excellent skid resistance, has become one of the most commonly used preventative maintenance methods in my country. However, after long-term exposure to various factors including vehicle loads, precipitation, and complex climates, traditional composite seals are prone to problems such as loosening, cracking, and insufficient durability, affecting road service performance and lifespan, and making it difficult to meet current high-standard and diverse maintenance needs. At the same time, increased road traffic volume has exacerbated vehicle exhaust pollution in road areas. Developing a high-viscosity, high-toughness pavement maintenance composite seal material and optimizing its construction methods could simultaneously improve adhesion to the existing pavement, skid resistance, crack resistance, and durability, which would be of great significance for promoting the application of preventative maintenance technologies. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a high-viscosity, high-toughness composite sealant material and its preparation method, thereby solving the technical problem that existing road maintenance sealant materials struggle to simultaneously achieve high viscosity and high toughness while also ensuring performance in purifying vehicle exhaust gases.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A high-viscosity, high-toughness composite sealing material, comprising an adhesive layer material and a surface functional layer material.

[0006] The adhesive layer material is composed of the following raw materials: matrix emulsified bitumen, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate.

[0007] The surface functional layer material is composed of the following raw materials: matrix emulsified asphalt, dehydrorosin-based isothiocyanate, ethyl 3-hydroxy-3-phenylpropionate, 2,6-di-tert-butyl-p-cresol, poly(p-phenylenebenzobisoxazole) fiber, cationic polyacrylamide, aggregate, and water.

[0008] The present invention also has the following technical features:

[0009] Specifically, the surface functional layer material, by weight, comprises 70-80 parts of matrix emulsified asphalt, 5-10 parts of dehydrorosin-based isothiocyanate, 5-10 parts of ethyl 3-hydroxy-3-phenylpropionate, 3-5 parts of 2,6-di-tert-butyl-p-cresol, 1-3 parts of poly(p-phenylenebenzobisoxazole) fiber, 4-8 parts of cationic polyacrylamide, 1000 parts of aggregate, and 40 parts of water.

[0010] Preferably, the surface functional layer material comprises, by weight, 75 parts of matrix emulsified asphalt, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, 6 parts of cationic polyacrylamide, 1000 parts of aggregate, and 40 parts of water.

[0011] Specifically, the adhesive layer material, by weight, is composed of the following raw materials: 75 parts of matrix emulsified bitumen, 25 parts of dehydrorosin-based isothiocyanate, and 25 parts of ethyl 3-hydroxy-3-phenylpropionate.

[0012] Preferably, the application rate of the adhesive layer material is 1.0 kg / m³. 2 .

[0013] The adhesive layer material is used to enhance interlayer adhesion and high-temperature stability; the surface functional layer material is used to enhance road surface flexibility, anti-skid performance, wear resistance and durability, as well as to enhance the purification performance of vehicle exhaust.

[0014] This invention also protects a method for preparing a road maintenance composite seal coat, characterized in that the method uses the high-viscosity, high-toughness composite seal coat material as described above, and the method includes the following steps:

[0015] Step 1, Preparation before preparation:

[0016] Repair, level, dry and clean the original road surface, and prepare the necessary materials and equipment for construction.

[0017] Step 2, Preparation of matrix emulsified asphalt material:

[0018] The temperature is controlled at 60-70℃. Appropriate amounts of emulsifier, hydrochloric acid, and stabilizer are added sequentially as needed. After thorough mixing, a soap solution is formed. The colloid mill is preheated to a temperature comparable to the soap solution, and then circulated for approximately 30 seconds to ensure the mill body is fully wetted by the soap solution. The soap solution is then drained, and the amount of soap solution required for the experimental mix is ​​added back in, maintaining a temperature of 60-70℃. After circulating for 10-20 seconds, the base asphalt temperature is controlled at 140-150℃, and the preheated base asphalt is slowly added. The addition of the base asphalt must be done at a uniform rate. After the base asphalt is added, circulation continues for 2-3 minutes to ensure the soap solution and asphalt are fully mixed and reacted, yielding the base emulsified asphalt material.

[0019] Step 3, prepare the adhesive layer material:

[0020] According to the formula, the matrix emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step one are added to the reactor. Nitrogen gas is introduced for protection, and the reaction temperature is controlled at 25°C. The mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. After being stirred evenly, the bonding layer material for interlayer bonding is obtained.

[0021] Step 4: Prepare the modified emulsified asphalt material for the surface functional layer:

[0022] According to the formula, the emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step one are added to the reactor. Nitrogen gas is introduced for protection, and the reaction temperature is controlled at 25°C. The mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. After stirring, 2,6-di-tert-butyl-p-cresol in the appropriate proportion is added, and the stirring speed is 100-300 r / min. After stirring evenly, the modified emulsified asphalt material for the surface functional layer is obtained.

[0023] Step 5, surface modification treatment of poly(p-phenylenebenzobisoxazole) fibers:

[0024] Poly(p-phenylene benzobisoxazole) fibers were sequentially immersed in deionized water and anhydrous ethanol, and subjected to reflux extraction for 6 hours each. After washing, the poly(p-phenylene benzobisoxazole) fibers were removed and dried under vacuum at 60°C for 12 hours to obtain clean poly(p-phenylene benzobisoxazole) fibers. Benzyltriethylammonium chloride, bis-aminopropylpolydimethylsiloxane, and distilled water were added to a reaction vessel, and the temperature was controlled at 60°C. The mixture was stirred at 500 rpm for 5 minutes to obtain a bis-aminopropylpolydimethylsiloxane emulsion. The poly(p-phenylene benzobisoxazole) fibers were then immersed in the bis-aminopropylpolydimethylsiloxane emulsion and subjected to ultrasonic vibration reaction at 60°C for 2 hours. After the reaction, the poly(p-phenylene benzobisoxazole) fibers were removed, rinsed with deionized water, and then dried under vacuum at 80°C to obtain surface-modified poly(p-phenylene benzobisoxazole) fibers.

[0025] Step 6: Prepare surface functional layer materials:

[0026] Add aggregates and water according to the proposed ratio and mix evenly. Then add the surface-modified poly(p-phenylenebenzobisoxazole) fiber prepared in step five, stir evenly, and then add the surface functional layer modified emulsified asphalt material prepared in step four. After stirring evenly, the surface functional layer material is obtained.

[0027] Step 7, Prepare the composite sealing layer:

[0028] The interlayer bonding material prepared in step three is sprayed onto the road surface. After spraying, it is dried for 30 minutes before the surface functional layer material is laid. After paving, traffic is closed for more than 4 hours and maintenance is carried out to form a composite seal layer that can purify vehicle exhaust.

[0029] Compared with the prior art, the present invention has the following technical effects:

[0030] (I) In this invention, the adhesive layer material is used to enhance interlayer adhesion and high-temperature stability; the surface functional layer material is used to enhance pavement flexibility, anti-skid performance, wear resistance, and durability, as well as to enhance the purification performance of vehicle exhaust. Specifically, the dehydrorosin-based isothiocyanate and ethyl 3-hydroxy-3-phenylpropionate composite material used in this invention, in addition to leveraging the adhesive properties, temperature stability, wear resistance, and corrosion resistance of dehydrorosin-based isothiocyanate and ethyl 3-hydroxy-3-phenylpropionate themselves, also produces a synergistic reinforcing effect, greatly improving the purification performance of the surface functional layer of vehicle exhaust. That is, this invention can improve the durability of preventive maintenance road seals while reducing environmental pollution.

[0031] (II) This invention uses modified poly(p-phenylenebenzobisoxazole) fiber, dehydrorosin-based isothiocyanate, ethyl 3-hydroxy-3-phenylpropionate, and 2,6-di-tert-butyl-p-cresol to modify emulsified asphalt. Poly(p-phenylenebenzobisoxazole) fiber possesses high elasticity and strength, excellent temperature stability and dimensional stability, and can improve the toughness of the surface functional layer; dehydrorosin-based isothiocyanate has excellent adhesive properties due to the presence of thiocyanate groups, and excellent temperature stability due to the presence of dehydrorosin groups; ethyl 3-hydroxy-3-phenylpropionate has excellent temperature stability and corrosion resistance; and 2,6-di-tert-butyl-p-cresol possesses excellent antioxidant properties.

[0032] (III) The present invention uses bis-aminopropyl polydimethylsiloxane to treat the surface of poly(p-phenylene benzobisoxazole) fiber. On the one hand, it can remove impurities from the surface of poly(p-phenylene benzobisoxazole) fiber. On the other hand, bis-aminopropyl polydimethylsiloxane can significantly improve the oleophilicity of poly(p-phenylene benzobisoxazole) fiber and improve the interfacial bonding force between the fiber and the asphalt. At the same time, the addition of cationic polyacrylamide can significantly improve the dispersion performance in the poly(p-phenylene benzobisoxazole) fiber mixture, thereby enhancing the toughness and durability of the composite seal material.

[0033] (IV) The composite sealing material prepared by this invention consists of two parts: an adhesive layer and a surface functional layer. It has excellent properties such as high strength, high adhesion, wear resistance, high temperature resistance, and good toughness. At the same time, it can also purify automobile exhaust, thereby reducing environmental pollution. The reaction process is controllable, the preparation process is simple, and the construction is not affected by the ambient temperature.

[0034] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, all raw materials and equipment used in this invention are those known in the prior art.

[0036] The road maintenance composite sealant of this invention can be used on the surfaces of roads, bridge decks, and tunnels. The high-adhesion, high-toughness road maintenance composite sealant comprises, from bottom to top, a first adhesive layer and a second surface functional layer. The adhesive layer enhances adhesion, toughness, and corrosion resistance, while the surface functional layer enhances road toughness, wear resistance, aging resistance, and the ability to purify vehicle exhaust gases.

[0037] The composite seal of the present invention has excellent adhesion, flexibility, anti-slip properties, wear resistance, durability, and vehicle exhaust purification performance. Moreover, the preparation process is simple, and it can achieve the goals of toughening and improving the quality of the composite seal, enhancing its efficiency, and reducing environmental pollution.

[0038] In this invention:

[0039] The base emulsified asphalt uses SK70# base asphalt, which is prepared using cationic slow-crack fast-setting emulsifier, hydrochloric acid, and polyvinyl alcohol stabilizer.

[0040] The base asphalt is SK70# asphalt, and its main technical parameters are shown in the table below:

[0041] Table 1 Technical Specifications of Base Asphalt

[0042]

[0043] Preferably, the number average molecular weight of polyvinyl alcohol is in the range of 20,000 to 50,000.

[0044] Dehydrorosin-based isothiocyanate, with a molecular weight of 417, has the following structural formula:

[0045]

[0046] Ethyl 3-hydroxy-3-phenylpropionate, with a molecular weight of 192, has the following structural formula:

[0047]

[0048] 2,6-Di-tert-butyl-p-cresol, with a molecular weight of 220, has the following structural formula:

[0049]

[0050] In the aggregate, coarse aggregate (9.5-2.36mm) is basalt, fine aggregate (less than 2.36mm) is limestone, and the filler is mineral powder and cement. The aggregate gradation is MS-3 type. The specific gradation is: 250 parts of 4.75mm aggregate, 260 parts of 2.36mm aggregate, 190 parts of 1.18mm aggregate, 110 parts of 0.6mm aggregate, 50 parts of 0.3mm aggregate, 40 parts of 0.15mm aggregate, 30 parts of 0.075mm aggregate, 20 parts of cement, and 50 parts of mineral powder.

[0051] The poly(p-phenylene benzobisoxazole) fiber is a known poly(p-phenylene benzobisoxazole) fiber with a length of 6 mm and a diameter of 12 μm. Preferably, the number-average molecular weight of the poly(p-phenylene benzobisoxazole) fiber is in the range of 20,000 to 100,000.

[0052] The fiber surface modifier is bis-aminopropyl polydimethylsiloxane. Preferably, the number average molecular weight of bis-aminopropyl polydimethylsiloxane is in the range of 1000 to 1100.

[0053] The fiber dispersant is cationic polyacrylamide. Commonly used cationic polyacrylamide is selected. For example, the cationic polyacrylamide used is PAM CE6560 produced by Wuxi Lansen Chemical Products Co., Ltd., with a viscosity of 200–400 CPS, a solid content of 40%, a pH of 3–6, a degree of ionization of 60%, and a number-average molecular weight range of 8 million–12 million.

[0054] In the following embodiments, the road subbase refers to an asphalt concrete substrate.

[0055] The composite seal material of this invention is used in the construction of composite seals for road maintenance.

[0056] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0057] Example 1:

[0058] This embodiment provides a high-viscosity and high-toughness composite sealant material for highway maintenance, comprising an adhesive layer material and a surface functional layer material:

[0059] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, and 25 parts ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 .

[0060] The surface functional layer material, by weight, is made from the following raw materials: 70 parts of matrix emulsified asphalt, 5 parts of dehydrorosin-based isothiocyanate, 5 parts of ethyl 3-hydroxy-3-phenylpropionate, 3 parts of 2,6-di-tert-butyl-p-cresol, 1 part of poly(p-phenylenebenzobisoxazole) fiber, 4 parts of polyacrylamide, 250 parts of 4.75mm aggregate, 260 parts of 2.36mm aggregate, 190 parts of 1.18mm aggregate, 110 parts of 0.6mm aggregate, 50 parts of 0.3mm aggregate, 40 parts of 0.15mm aggregate, 30 parts of 0.075mm aggregate, 20 parts of cement, 50 parts of mineral powder, and 40 parts of water.

[0061] This invention also provides a method for preparing a road maintenance composite seal coat. This method uses the high-viscosity, high-toughness composite seal coat material described in this embodiment, and includes the following steps:

[0062] Step 1, Preparation before preparation:

[0063] Repair, level, dry and clean the road base layer, and prepare the raw materials and equipment needed for construction.

[0064] Step 2, Preparation of matrix emulsified asphalt:

[0065] The temperature is controlled at 60-70℃. Appropriate amounts of emulsifier, hydrochloric acid, and stabilizer are added sequentially as needed. After thorough mixing, a soap solution is formed. The colloid mill is preheated to a temperature comparable to the soap solution, and then circulated for approximately 30 seconds to ensure the mill body is fully wetted by the soap solution. The soap solution is then drained, and the amount of soap solution required for the test mix is ​​added back in, maintaining a temperature of 60-70℃. After circulating for 10-20 seconds, the base asphalt temperature is controlled at 140-150℃. The preheated base asphalt is then slowly added at a uniform rate. After the base asphalt is added, circulation continues for 2-3 minutes to ensure the soap solution and asphalt are fully mixed and reacted, yielding the base emulsified asphalt.

[0066] Step 3, prepare the adhesive layer material:

[0067] According to the formula, the matrix emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step one are added to the reactor. Nitrogen gas is introduced for protection, and the reaction temperature is controlled at 25°C. The mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. The stirring speed can be adjusted appropriately during the stirring process. After stirring evenly, the bonding layer material for interlayer bonding is obtained.

[0068] Step 4: Prepare the modified emulsified asphalt material for the surface functional layer:

[0069] According to the formula, the emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step one are added to the reactor. Nitrogen gas is introduced for protection, and the reaction temperature is controlled at 25°C. The mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. The stirring speed can be adjusted appropriately during the stirring process. After stirring, 2,6-di-tert-butyl-p-cresol in the corresponding proportion is added, and the stirring speed is 100-300 r / min. After stirring evenly, the modified emulsified asphalt material for the surface functional layer is obtained.

[0070] Step 5, surface modification treatment of poly(p-phenylenebenzobisoxazole) fibers:

[0071] Poly(p-phenylene benzobisoxazole) fibers were sequentially immersed in deionized water and anhydrous ethanol, and subjected to reflux extraction for 6 hours each. After washing, the poly(p-phenylene benzobisoxazole) fibers were removed and dried under vacuum at 60°C for 12 hours to obtain clean poly(p-phenylene benzobisoxazole) fibers. Benzyltriethylammonium chloride and bis-aminopropylpolydimethylsiloxane were added to a reaction vessel, and an appropriate amount of distilled water was added while stirring, maintaining the temperature inside the vessel at 60°C. After the addition was complete, the mixture was stirred at 500 rpm for 5 minutes to obtain a bis-aminopropylpolydimethylsiloxane emulsion. The poly(p-phenylene benzobisoxazole) fibers were then immersed in the bis-aminopropylpolydimethylsiloxane emulsion and subjected to ultrasonic vibration reaction at 60°C for 2 hours. After the reaction, the poly(p-phenylene benzobisoxazole) fibers were removed, rinsed with deionized water, and then dried under vacuum at 80°C to obtain surface-modified poly(p-phenylene benzobisoxazole) fibers.

[0072] Step 6: Prepare surface functional layer materials:

[0073] Add aggregate and water according to the proposed ratio and mix evenly. Then add the surface-modified poly(p-phenylene benzobisoxazole) fiber prepared in step five, stir evenly, and then add the surface functional layer modified emulsified asphalt material prepared in step four. Continue to stir evenly to obtain the surface functional layer material.

[0074] Step 7: Prepare the road maintenance composite seal layer:

[0075] The interlayer bonding material prepared in step three is sprayed onto the road surface. After spraying, it is dried for 30 minutes and then the surface functional layer material is laid. After paving, traffic is closed for more than 4 hours and maintenance is carried out to form a road maintenance composite seal that can purify vehicle exhaust.

[0076] Performance Testing: To verify that the road maintenance composite seal material of this embodiment has wear resistance, adhesion, high temperature stability, low temperature crack resistance, and vehicle exhaust purification performance, asphalt concrete specimens with a prefabricated size of 30*30*5cm were prepared in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011). The specimens were made according to the above-mentioned construction steps for asphalt pavement bodies. After completion, the interlayer bond strength, abrasion loss, dynamic stability, bottom bending tensile strain, and vehicle exhaust purification rate of the specimens were tested. The test results are shown in Table 1.

[0077] Example 2:

[0078] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and the material in Example 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0079] The adhesive layer material is the same as that in Example 1.

[0080] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, and 4 parts of polyacrylamide.

[0081] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0082] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0083] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0084] Example 3:

[0085] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0086] The adhesive layer material is the same as in Example 1.

[0087] The surface functional layer material, by weight, is made from the following raw materials: 80 parts of matrix emulsified bitumen, 10 parts of dehydrorosin-based isothiocyanate, 10 parts of ethyl 3-hydroxy-3-phenylpropionate, 5 parts of 2,6-di-tert-butyl-p-cresol, 3 parts of poly(p-phenylenebenzobisoxazole) fiber, and 8 parts of polyacrylamide.

[0088] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0089] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0090] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0091] Example 4:

[0092] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0093] The adhesive layer material is the same as in Example 1.

[0094] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 10 parts of ethyl 3-hydroxy-3-phenylpropionate, 3 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, and 5 parts of polyacrylamide.

[0095] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0096] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0097] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0098] Example 5:

[0099] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0100] The adhesive layer material is the same as in Example 1.

[0101] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 5 parts of dehydrorosin-based isothiocyanate, 8 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 3 parts of poly(p-phenylenebenzobisoxazole) fiber, and 4 parts of polyacrylamide.

[0102] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0103] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0104] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0105] Example 6:

[0106] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0107] The adhesive layer material is the same as in Example 1.

[0108] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 6 parts of dehydrorosin-based isothiocyanate, 9 parts of ethyl 3-hydroxy-3-phenylpropionate, 3 parts of 2,6-di-tert-butyl-p-cresol, 3 parts of poly(p-phenylenebenzobisoxazole) fiber, and 6 parts of polyacrylamide.

[0109] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0110] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0111] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0112] Example 7:

[0113] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0114] The adhesive layer material is the same as in Example 1.

[0115] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 10 parts of dehydrorosin-based isothiocyanate, 6 parts of ethyl 3-hydroxy-3-phenylpropionate, 5 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of modified polypropylene fiber, and 4 parts of polyacrylamide.

[0116] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0117] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0118] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0119] Example 8:

[0120] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0121] The adhesive layer material is the same as in Example 1.

[0122] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 8 parts of dehydrorosin-based isothiocyanate, 8 parts of ethyl 3-hydroxy-3-phenylpropionate, 3 parts of 2,6-di-tert-butyl-p-cresol, 1 part of poly(p-phenylenebenzobisoxazole) fiber, and 6 parts of polyacrylamide.

[0123] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0124] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0125] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0126] Example 9:

[0127] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 1 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0128] The adhesive layer material is the same as in Example 1.

[0129] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, and 6 parts of polyacrylamide.

[0130] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 1.

[0131] The present invention also provides a method for preparing a road maintenance composite seal, which uses the high-viscosity and high-toughness composite seal material given in this embodiment, and the specific implementation steps are basically the same as those in Embodiment 1.

[0132] Performance testing: The performance testing process in this embodiment is basically the same as that in embodiment 1. The performance testing results in this embodiment are shown in Table 1.

[0133] Comparative Example 1:

[0134] This comparative example presents a high-viscosity, high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Example 2 is that the surface functional layer material does not contain dehydrogenated rosin-based isothiocyanate, as detailed below:

[0135] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, 25 parts ethyl 3-hydroxy-3-phenylpropionate, and a spraying rate of 1.0 kg / m³. 2 .

[0136] The surface functional layer material, by weight, is made of the following raw materials: 82 parts of matrix emulsified bitumen, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, and 6 parts of polyacrylamide.

[0137] The selection and specifications of each raw material in this comparative example are the same as those in Example 2.

[0138] This comparative example also provides a method for preparing a road maintenance composite seal layer. This method uses the high-viscosity, high-toughness composite seal layer material given in this example, and the specific implementation steps are basically the same as in Example 2. The difference is that in step four, when preparing the modified emulsified asphalt material for the surface functional layer, only emulsified asphalt, ethyl 3-hydroxy-3-phenylpropionate, and 2,6-di-tert-butyl-p-cresol are added, and dehydrorosin-based isothiocyanate is not added.

[0139] Comparative Example 2:

[0140] This comparative example presents a high-viscosity, high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Example 2 is that the surface functional layer material does not contain ethyl 3-hydroxy-3-phenylpropionate, as detailed below:

[0141] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, and 25 parts ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 .

[0142] The surface functional layer material, by weight, is made of the following raw materials: 82 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, and 6 parts of polyacrylamide.

[0143] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 2.

[0144] This comparative example also provides a method for preparing a road maintenance composite seal layer. This method uses the high-viscosity, high-toughness composite seal layer material given in this example, and the specific implementation steps are basically the same as in Example 2. The difference lies in step four, where, in preparing the modified emulsified asphalt material for the surface functional layer, only emulsified asphalt, dehydrorosin-based isothiocyanate, and 2,6-di-tert-butyl-p-cresol are added, without adding ethyl 3-hydroxy-3-phenylpropionate.

[0145] Comparative Example 3:

[0146] This comparative example presents a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Example 2 is that the surface functional layer material does not contain poly(p-phenylene benzobisoxazole) fiber and polyacrylamide, as detailed below:

[0147] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, and 25 parts ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 .

[0148] The surface functional layer material, by weight, is made from the following raw materials: 83 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, and 4 parts of 2,6-di-tert-butyl-p-cresol.

[0149] The selection and specifications of each raw material in this comparative example are the same as those in Example 2.

[0150] This comparative example also provides a method for preparing a road maintenance composite seal coat. This method uses the high-viscosity, high-toughness composite seal coat material given in this example, and the specific implementation steps are basically the same as in Example 2. The differences are: 1) step five is not performed; 2) poly(p-phenylenebenzobisoxazole) fiber and polyacrylamide are not added in step six.

[0151] Comparative Example 4:

[0152] This comparative example presents a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Example 2 is that the poly(p-phenylene benzobisoxazole) fiber used in the surface functional layer material has not undergone polyacrylamide modification treatment, as detailed below:

[0153] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, and 25 parts ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 .

[0154] The surface functional layer material, by weight, is made from the following raw materials: 81 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, and 2 parts of poly(p-phenylenebenzobisoxazole) fiber.

[0155] The selection and specifications of each raw material in this comparative example are the same as those in Example 2.

[0156] This comparative example also provides a method for preparing a road maintenance composite seal coat. This method uses the high-viscosity, high-toughness composite seal coat material given in this embodiment, and the specific implementation steps are basically the same as in Example 2. The difference is that: 1) no polyacrylamide is added in step six.

[0157] Comparative Example 5:

[0158] This embodiment provides a high-viscosity and high-toughness road maintenance composite seal material. The difference between this road maintenance composite seal material and Embodiment 2 lies only in the formulation of the adhesive layer material and the surface functional layer material, as detailed below:

[0159] The bonding layer material, by weight fraction, is made from the following raw materials: 75 parts base emulsified bitumen, 25 parts dehydrorosin-based isothiocyanate, and 25 parts ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 .

[0160] The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified bitumen, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of polypropylene fiber, and 4 parts of polyacrylamide.

[0161] The selection and specifications of each raw material in this embodiment are the same as in Embodiment 2.

[0162] This comparative example also provides a method for preparing a road maintenance composite seal layer. This method uses the high-viscosity and high-toughness composite seal layer material given in this embodiment, and the specific implementation steps are basically the same as those in Example 2.

[0163] Performance Testing: The performance testing process in this embodiment is basically the same as in Embodiment 2. The performance test results in this embodiment are shown in Table 1. The selection and specifications of each raw material in this comparative example are the same as in Embodiment 2.

[0164] The preparation method of this comparative example is basically the same as that of Example 2, except that: 1) in steps five and six, the poly(p-phenylenebenzobisoxazole) fiber is replaced with polypropylene fiber.

[0165] Table 1 Performance Test Table of High-Viscosity and High-Toughness Road Maintenance Composite Sealing Coating Material

[0166]

[0167] As can be seen from Table 1:

[0168] First, comparing the various indicators of Examples 1-9 and Comparative Examples 1-6, it can be found that Example 2 has the best overall performance. The optimal raw material composition is as follows: the binder material, by weight fraction, is made from the following raw materials: 75 parts of matrix emulsified asphalt, 25 parts of dehydrorosin-based isothiocyanate, and 25 parts of ethyl 3-hydroxy-3-phenylpropionate, with a spraying rate of 1.0 kg / m³. 2 The surface functional layer material, by weight, is made from the following raw materials: 75 parts of matrix emulsified asphalt, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, 4 parts of polyacrylamide, 250 parts of 4.75mm aggregate, 260 parts of 2.36mm aggregate, 190 parts of 1.18mm aggregate, 110 parts of 0.6mm aggregate, 50 parts of 0.3mm aggregate, 40 parts of 0.15mm aggregate, 30 parts of 0.075mm aggregate, 20 parts of cement, 50 parts of mineral powder, and 40 parts of water.

[0169] Secondly, analysis of the various indicators of Examples 1-9 and Comparative Examples 1-6 reveals that, in addition to their own adhesive properties, wear resistance, and corrosion resistance, 25 parts of dehydrorosin-based isothiocyanate and ethyl 3-hydroxy-3-phenylpropionate also exhibit a synergistic effect. The composite material can significantly enhance the performance of the composite seal in purifying automobile exhaust gases, improving the durability of the preventive maintenance road seal while also reducing environmental pollution.

[0170] Third, analysis of Example 2 and Comparative Examples 1-6 shows that dehydrorosin-based isothiocyanate can significantly improve the crack resistance and adhesion of the composite seal layer, ethyl 3-hydroxy-3-phenylpropionate can significantly improve the high-temperature stability of the composite seal layer, and modified poly(p-phenylenebenzobisoxazole) fiber can significantly improve the low-temperature crack resistance of the composite seal layer. Moreover, after adding cationic polyacrylamide, the better the dispersion performance of poly(p-phenylenebenzobisoxazole) fiber in the mixture, the better the low-temperature crack resistance of the composite seal layer.

Claims

1. A high-viscosity, high-toughness composite sealing material, characterized in that, Including adhesive layer materials and surface functional layer materials; The adhesive layer material is composed of the following raw materials: matrix emulsified bitumen, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate; The surface functional layer material is composed of the following raw materials: matrix emulsified bitumen, dehydrorosin-based isothiocyanate, ethyl 3-hydroxy-3-phenylpropionate, 2,6-di-tert-butyl-p-cresol, poly(p-phenylenebenzobisoxazole) fiber, cationic polyacrylamide, aggregate, and water. Surface modification of poly(p-phenylene benzobisoxazole) fibers: Poly(p-phenylene benzobisoxazole) fibers were sequentially immersed in deionized water and anhydrous ethanol, and subjected to reflux extraction for 6 h each. After cleaning, the poly(p-phenylene benzobisoxazole) fibers were removed and dried under vacuum at 60℃ for 12 h to obtain clean poly(p-phenylene benzobisoxazole) fibers. Benzyltriethylammonium chloride, bis-aminopropylpolydimethylsiloxane, and distilled water were added to a reaction vessel, and the temperature inside the vessel was controlled at 60℃. The mixture was stirred at 500 r / min for 5 min to obtain a bis-aminopropylpolydimethylsiloxane emulsion. The poly(p-phenylene benzobisoxazole) fibers were then immersed in the bis-aminopropylpolydimethylsiloxane emulsion and subjected to ultrasonic vibration reaction at 60℃ for 2 h. After the reaction, the poly(p-phenylene benzobisoxazole) fibers were removed, rinsed with deionized water, and then dried under vacuum at 80℃ to obtain surface-modified poly(p-phenylene benzobisoxazole) fibers.

2. The high-viscosity, high-toughness composite sealing material as described in claim 1, characterized in that, The surface functional layer material, by weight, comprises 70-80 parts of matrix emulsified asphalt, 5-10 parts of dehydrorosin-based isothiocyanate, 5-10 parts of ethyl 3-hydroxy-3-phenylpropionate, 3-5 parts of 2,6-di-tert-butyl-p-cresol, 1-3 parts of poly(p-phenylenebenzobisoxazole) fiber, 4-8 parts of cationic polyacrylamide, 1000 parts of aggregate, and 40 parts of water.

3. The high-viscosity, high-toughness composite sealing material as described in claim 2, characterized in that, The surface functional layer material, by weight, comprises 75 parts of matrix emulsified asphalt, 7 parts of dehydrorosin-based isothiocyanate, 7 parts of ethyl 3-hydroxy-3-phenylpropionate, 4 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of poly(p-phenylenebenzobisoxazole) fiber, 6 parts of cationic polyacrylamide, 1000 parts of aggregate, and 40 parts of water.

4. The high-viscosity, high-toughness composite sealing material as described in claim 1, characterized in that, The adhesive layer material, by weight, is composed of the following raw materials: 75 parts of matrix emulsified bitumen, 25 parts of dehydrorosin-based isothiocyanate, and 25 parts of ethyl 3-hydroxy-3-phenylpropionate.

5. The high-viscosity, high-toughness composite sealing material as described in claim 1, characterized in that, The application rate of the adhesive layer material is 1.0 kg / m³. 2 。 6. A method for preparing a road maintenance composite seal layer, characterized in that, This method uses the high-viscosity, high-toughness composite sealing material as described in any one of claims 1 to 5, and the method includes the following steps: Step 1, Preparation before preparation: Repair, level, dry and clean the original road surface, and prepare the raw materials and equipment needed for construction. Step 2, Preparation of matrix emulsified asphalt: The temperature is controlled at 60-70℃. Appropriate amounts of emulsifier, hydrochloric acid, and stabilizer are added sequentially as needed. After thorough mixing, a soap solution is formed. The colloid mill is preheated to a temperature comparable to the soap solution, and then circulated for approximately 30 seconds to ensure the mill body is fully wetted by the soap solution. The soap solution is then drained, and the amount of soap solution required for the experimental mix is ​​added back in, maintaining a temperature of 60-70℃. After circulating for 10-20 seconds, the base asphalt temperature is controlled at 140-150℃. The preheated base asphalt is then slowly added, ensuring a uniform addition rate. After the base asphalt is added, circulation continues for 2-3 minutes to allow the soap solution and asphalt to fully mix and react, thus obtaining the base emulsified asphalt. Step 3, prepare the adhesive layer material: According to the formula, the matrix emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step 2 are added to the reaction vessel, nitrogen gas is introduced for protection, the reaction temperature is controlled at 25℃, and the mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. After stirring evenly, the bonding layer material for interlayer bonding is obtained. Step 4: Prepare the modified emulsified asphalt material for the surface functional layer: According to the formula, the emulsified asphalt, dehydrorosin-based isothiocyanate, and ethyl 3-hydroxy-3-phenylpropionate obtained in step two are added to the reactor. Nitrogen gas is introduced for protection, and the reaction temperature is controlled at 25°C. The mixture is sheared and stirred at a low speed of 100-300 r / min for 3 min, and then sheared and stirred at a high speed of 500-800 r / min for 2 min. After stirring, 2,6-di-tert-butyl-p-cresol in the appropriate ratio is added, and the stirring speed is 100-300 r / min. After stirring evenly, the modified emulsified asphalt material for the surface functional layer is obtained. Step 5: Surface modification treatment of poly(p-phenylenebenzobisoxazole) fibers; Step 6: Prepare the surface functional layer material: Add aggregate and water according to the proposed ratio and mix evenly. Then add the surface-modified poly(p-phenylene benzobisoxazole) fiber prepared in step five, stir evenly, and then add the surface functional layer modified emulsified asphalt material prepared in step four. After stirring evenly, the surface functional layer material is obtained. Step 7: Prepare the road maintenance composite seal layer: The adhesive layer material prepared in step three is sprayed onto the road surface. After spraying, it is dried for 30 minutes. The surface functional layer material is then laid. After laying, traffic is closed for more than 4 hours and maintenance is carried out to form a road maintenance composite seal that can purify vehicle exhaust.

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