High-viscosity fog sealing layer for ultrathin overlay maintenance and preparation method of high-viscosity fog sealing layer

Abstract

The invention discloses a high-viscosity fog sealing layer for ultrathin overlay maintenance and a preparation method thereof, and belongs to the technical field of highway engineering construction materials, the high-viscosity fog sealing layer comprises the following components by weight: 100 parts of emulsified asphalt, 12-15 parts of a water-borne epoxy resin emulsion, 3-5 parts of SBS latex, 0.5-0.8 part of an emulsifier, 4-5 parts of a curing agent, and 0.6-0.8 part of a functional modifier. According to the invention, a mode of firstly emulsifying and then modifying is adopted, the emulsified asphalt is subjected to composite modification through the water-borne epoxy resin emulsion and the SBS latex, and the functional modifier is added, so that the permeability and the protection effect of the fog seal material are greatly improved, and the durability of a pavement is improved.

Description

Technical Field

[0001] This invention relates to the field of road construction materials technology, specifically to an ultra-thin high-viscosity fog seal for overlay maintenance and its preparation method, and more particularly to an ultra-thin high-viscosity fog seal for overlay maintenance with active protective effect and its preparation method. Background Technology

[0002] my country's highway network has been basically formed, and highway maintenance and repair projects are becoming increasingly important. Among them, preventive maintenance can address the initial defects of asphalt pavements and is highly regarded for its good results and low life-cycle costs.

[0003] Fog seal is a widely used preventative maintenance technology due to its simple construction and low cost. Currently, existing high-viscosity fog seal technologies typically use polymers such as SBS, SBR, and water-based epoxy resins as asphalt modifiers to improve the adhesion of the fog seal material to the pavement and the mechanical properties of the film after formation. However, these technologies suffer from limitations: limited effectiveness, inability to balance high and low performance, poor permeability, and inability to meet the maintenance needs of ultra-thin overlays requiring higher performance. Furthermore, they cannot actively protect asphalt pavements from damage caused by harmful media after implementation, relying solely on the asphalt's self-healing properties with minimal effect.

[0004] To address the aforementioned issues, it is necessary to develop an ultra-thin, high-viscosity fog seal material for asphalt pavement maintenance that combines high and low temperature performance with strong penetration capabilities and can actively protect against damage from harmful media. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an ultra-thin high-viscosity fog seal for surface maintenance and its preparation method, thereby solving the problems of existing fog seal technologies being unable to balance high and low performance, having poor permeability, and being unable to actively protect against harmful media.

[0006] To achieve the above objectives, the following technical solution is adopted.

[0007] A high-viscosity fog seal for ultra-thin surface maintenance comprises the following components by weight: 100 parts emulsified asphalt, 12-15 parts waterborne epoxy resin emulsion, 3-5 parts SBS latex, 0.5-0.8 parts emulsifier, 4-5 parts waterborne epoxy curing agent, and 0.6-0.8 parts functional modifier.

[0008] Furthermore, the emulsified asphalt is ordinary cationic or nonionic emulsified asphalt with a solid content >50%.

[0009] Furthermore, the emulsifier is obtained by mixing Tween-80 and Span-80 in a 1:1 ratio.

[0010] Furthermore, the functionalized modifier is functionalized molybdenum disulfide modified graphene oxide.

[0011] Furthermore, the preparation method of the functionalized modifier includes the following steps:

[0012] The first step involves dispersing flake-shaped nano-molybdenum disulfide, aniline, and ammonium persulfate in deionized water at a weight ratio of 1:1:1.5. The mixture is stirred at 500 rpm at room temperature for 24 hours, filtered, washed with anhydrous ethanol, and dried to obtain polyaniline-modified nano-molybdenum disulfide.

[0013] The second step involves dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 hours, and then drying to obtain the functionalized modifier.

[0014] A method for preparing an ultra-thin high-viscosity fog seal coating for surface curing includes the following steps:

[0015] Step 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0016] Step 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, mix evenly, then add the suspension from Step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effects for maintenance.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention employs epoxy resin and SBS to composite-modify fog sealing materials, while simultaneously considering the high and low temperature performance of the fog sealing materials. Based on this, functionalized nanofillers are introduced. Graphene oxide modified with functionalized molybdenum disulfide exhibits enhanced interfacial compatibility with the fog sealing material, allowing it to be uniformly dispersed within the fog sealing material matrix. This participates in the construction of the three-dimensional network structure of the epoxy resin and SBS, enhancing the crosslinking density of the polymer three-dimensional network and improving the strength of the network structure, thereby further improving the performance of the fog sealing material. Graphene oxide, as a two-dimensional material, acts as a physical barrier to resist the erosion of the mixture by light, O2, water, and harmful metal ions. Nano-molybdenum disulfide, as an intercalating agent, can exfoliate graphene oxide, thereby strengthening its physical barrier effect. Furthermore, as a solid lubricant, nano-molybdenum disulfide can also lubricate and promote the flow of the fog seal material, allowing it to quickly flow into the microcracks and micropores inside the mixture within an effective time, thus achieving deep penetration and fully utilizing the protective function of the fog seal material. Combined with its shielding effect against harmful media in the environment, the protective effect of the fog seal material is greatly improved. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] The raw materials and reagents used in the following examples are all commercially available products.

[0021] Example 1:

[0022] A high-viscosity fog seal with active protective effect for ultra-thin surface maintenance and its preparation method are characterized by comprising the following components by weight: 100 parts emulsified asphalt, 12 parts waterborne epoxy resin emulsion, 3 parts SBS latex, 0.5 parts emulsifier, 4 parts waterborne epoxy curing agent, and 0.6 parts functional modifier.

[0023] The emulsified asphalt is a common cationic emulsified asphalt with a solid content >50%.

[0024] The emulsifier is a mixture of Tween-80 and Span-80 in a 1:1 ratio.

[0025] The functionalized modifier is functionalized molybdenum disulfide modified graphene oxide.

[0026] The preparation method of the functionalized modifier includes the following steps: Dispersing flake-shaped nano-molybdenum disulfide: aniline: ammonium persulfate in deionized water at a weight ratio of 1:1:1.5, stirring at 500 rpm at room temperature for 24 h, filtering, washing with anhydrous ethanol, and drying to obtain polyaniline-modified nano-molybdenum disulfide; dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 h, and drying to obtain the functionalized modifier.

[0027] A method for preparing an ultra-thin, high-viscosity fog seal coating with active protective effect, characterized in that the method includes the following steps:

[0028] 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0029] 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, and after mixing evenly, add the suspension from step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effect for maintenance.

[0030] Example 2:

[0031] A high-viscosity fog seal with active protective effect for ultra-thin surface maintenance and its preparation method are characterized by comprising the following components by weight: 100 parts emulsified asphalt, 12 parts waterborne epoxy resin emulsion, 3 parts SBS latex, 0.5 parts emulsifier, 4 parts waterborne epoxy curing agent, and 0.6 parts functional modifier.

[0032] The emulsified asphalt is ordinary nonionic emulsified asphalt with a solid content >50%.

[0033] The emulsifier is a mixture of Tween-80 and Span-80 in a 1:1 ratio.

[0034] The functionalized modifier is functionalized molybdenum disulfide modified graphene oxide.

[0035] The preparation method of the functionalized modifier includes the following steps: Dispersing flake-shaped nano-molybdenum disulfide: aniline: ammonium persulfate in deionized water at a weight ratio of 1:1:1.5, stirring at 500 rpm at room temperature for 24 h, filtering, washing with anhydrous ethanol, and drying to obtain polyaniline-modified nano-molybdenum disulfide; dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 h, and drying to obtain the functionalized modifier.

[0036] A method for preparing an ultra-thin, high-viscosity fog seal coating with active protective effect, characterized in that the method includes the following steps:

[0037] 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0038] 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, and after mixing evenly, add the suspension from step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effect for maintenance.

[0039] Example 3:

[0040] A high-viscosity fog seal with active protective effect for ultra-thin surface maintenance and its preparation method are characterized by comprising the following components by weight: 100 parts emulsified asphalt, 15 parts waterborne epoxy resin emulsion, 5 parts SBS latex, 0.8 parts emulsifier, 5 parts waterborne epoxy curing agent, and 0.8 parts functional modifier.

[0041] The emulsified asphalt is a common cationic emulsified asphalt with a solid content >50%.

[0042] The emulsifier is a mixture of Tween-80 and Span-80 in a 1:1 ratio.

[0043] The functionalized modifier is functionalized molybdenum disulfide modified graphene oxide.

[0044] The preparation method of the functionalized modifier includes the following steps: Dispersing flake-shaped nano-molybdenum disulfide: aniline: ammonium persulfate in deionized water at a weight ratio of 1:1:1.5, stirring at 500 rpm at room temperature for 24 h, filtering, washing with anhydrous ethanol, and drying to obtain polyaniline-modified nano-molybdenum disulfide; dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 h, and drying to obtain the functionalized modifier.

[0045] A method for preparing an ultra-thin, high-viscosity fog seal coating with active protective effect, characterized in that the method includes the following steps:

[0046] 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0047] 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, and after mixing evenly, add the suspension from step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effect for maintenance.

[0048] Example 4:

[0049] A high-viscosity fog seal with active protective effect for ultra-thin surface maintenance and its preparation method are characterized by comprising the following components by weight: 100 parts emulsified asphalt, 13 parts waterborne epoxy resin emulsion, 4 parts SBS latex, 0.6 parts emulsifier, 4.5 parts waterborne epoxy curing agent, and 0.7 parts functional modifier.

[0050] The emulsified asphalt is a common cationic emulsified asphalt with a solid content >50%.

[0051] The emulsifier is a mixture of Tween-80 and Span-80 in a 1:1 ratio.

[0052] The functionalized modifier is functionalized molybdenum disulfide modified graphene oxide.

[0053] The preparation method of the functionalized modifier includes the following steps: Dispersing flake-shaped nano-molybdenum disulfide: aniline: ammonium persulfate in deionized water at a weight ratio of 1:1:1.5, stirring at 500 rpm at room temperature for 24 h, filtering, washing with anhydrous ethanol, and drying to obtain polyaniline-modified nano-molybdenum disulfide; dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 h, and drying to obtain the functionalized modifier.

[0054] A method for preparing an ultra-thin, high-viscosity fog seal coating with active protective effect, characterized in that the method includes the following steps:

[0055] 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0056] 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, and after mixing evenly, add the suspension from step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effect for maintenance.

[0057] Comparative Example 1:

[0058] In the comparative example, the functional modifier was graphene oxide, and the rest was the same as in Example 1.

[0059] A high-viscosity fog seal with active protective effect for ultra-thin surface maintenance and its preparation method are characterized by comprising the following components by weight: 100 parts emulsified asphalt, 12 parts waterborne epoxy resin emulsion, 3 parts SBS latex, 0.5 parts emulsifier, 4 parts waterborne epoxy curing agent, and 0.6 parts functional modifier.

[0060] The emulsified asphalt is a common cationic emulsified asphalt with a solid content >50%.

[0061] The emulsifier is a mixture of Tween-80 and Span-80 in a 1:1 ratio.

[0062] The functional modifier is graphene oxide.

[0063] A method for preparing an ultra-thin, high-viscosity fog seal coating with active protective effect, characterized in that the method includes the following steps:

[0064] 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension.

[0065] 2) Add the water-based epoxy resin emulsion and SBS latex to the emulsified asphalt, stir at room temperature for 10 minutes, and after mixing evenly, add the suspension from step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm. This yields an ultra-thin, high-viscosity fog seal coating with active protective effect for maintenance.

[0066] The performance of an ultra-thin high-viscosity fog seal with active protection effect prepared in Examples 1-4 and Comparative Example 1 of this invention was tested, and the experimental results are shown in Table 1 below.

[0067] Table 1 Performance test results of Examples 1-4 and Comparative Example 1

[0068] Experimental Project Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Permeation rate (cm / min) 2.57 2.46 2.16 2.42 0.56 Bond strength to substrate / MPa 4.4 4.2 4.6 4.2 2.1 Water immersion residual stability / % 98.2 96.4 98.8 95.3 89.4 Freeze-thaw splitting strength ratio / % 94.2 95.6 96.7 96.1 84.2 Photo-oxidative aging quality loss rate / % 1.6 1.9 1.0 1.1 5.5

[0069] The test results of the examples and comparative examples in Table 1 show that the high-viscosity fog seal coatings prepared in Examples 1-4 have significantly better overall performance than Comparative Example 1, indicating that the high-viscosity fog seal coating prepared by this invention has superior performance. Compared with the comparative example, the functionalized modifiers in Examples 1-4 participate in the construction of the polymer network structure, enhancing the network structure in the modified asphalt. Simultaneously, their lubricating and physical protective effects enable the fog seal coating to achieve deep penetration and effectively resist the erosion of the mixture by harmful media. In contrast, the comparative example uses ordinary graphene oxide, whose high surface energy and interlayer van der Waals forces make it prone to agglomeration in the fog seal coating material, thus failing to function effectively.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-viscosity fog sealant for ultra-thin surface curing, characterized in that, It comprises the following components by weight: 100 parts emulsified asphalt, 12-15 parts waterborne epoxy resin emulsion, 3-5 parts SBS latex, 0.5-0.8 parts emulsifier, 4-5 parts waterborne epoxy curing agent, and 0.6-0.8 parts functional modifier.

2. The ultra-thin high-viscosity fog sealant for surface maintenance according to claim 1, characterized in that, The emulsified asphalt is ordinary cationic or nonionic emulsified asphalt with a solid content >50%.

3. The ultra-thin high-viscosity fog sealant for surface maintenance according to claim 1, characterized in that, The emulsifier is obtained by mixing Tween-80 and Span-80 in a 1:1 ratio.

4. The ultra-thin high-viscosity fog sealant for surface maintenance according to claim 1, characterized in that, The functionalizing modifier is functionalized molybdenum disulfide modified graphene oxide.

5. The ultra-thin high-viscosity fog sealant for surface maintenance according to claim 1, characterized in that, The preparation method of the functionalized modifier includes the following steps: The first step involves dispersing flake-shaped nano-molybdenum disulfide, aniline, and ammonium persulfate in deionized water at a weight ratio of 1:1:1.

5. The mixture is stirred at 500 rpm at room temperature for 24 hours, filtered, washed with anhydrous ethanol, and dried to obtain polyaniline-modified nano-molybdenum disulfide. The second step involves dispersing polyaniline-modified nano-molybdenum disulfide and graphene oxide in a 1:1 ratio in deionized water, stirring at room temperature for 24 hours, and then drying to obtain the functionalized modifier.

6. A method for preparing an ultra-thin high-viscosity fog seal coating for surface curing, comprising the following steps: Step 1) Weigh the raw materials according to the mass fraction, and use ultrasound to uniformly disperse the functional modifier in 10 parts of water. Add the emulsifier and water-based epoxy curing agent, and mix evenly to obtain a stable suspension. Step 2) Add waterborne epoxy resin emulsion and SBS latex to emulsified asphalt, stir at room temperature for 10 minutes, mix evenly, then add the suspension from Step 1), and continue stirring for 10 minutes at a stirring speed of 150 rpm; to obtain an ultra-thin high-viscosity fog seal for maintenance with active protection effect.