Waterborne epoxy asphalt colored pavement antiskid coating and preparation method thereof

Abstract

The invention discloses a waterborne epoxy asphalt colored pavement anti-skid coating which comprises a component A, a component B and a component C. The waterborne epoxy asphalt colored pavement anti-skid coating is characterized in that the component A comprises the following components in parts by weight: 1-10 parts of a component C and 1-10 parts of a component B, comprising 35 to 50 parts of water-borne epoxy resin, 25 to 40 parts of modified water-borne emulsified asphalt, 5 to 15 parts of a filling material, 0.8 to 1 part of zinc chloride, 0.5 to 2 parts of a wetting agent, 0.3 to 0.6 part of a thickening agent, 0.4 to 0.8 part of a dispersant, 0.2 to 0.3 part of an antifoaming agent, 0.3 to 0.5 part of an anti-settling agent and 8 to 10 parts of a pigment. The component B comprises the following components in parts by weight: 8-12 parts of a composite curing agent; and the component C comprises an anti-skid aggregate. According to the invention, the performance of a system is enhanced by adopting a multi-component synergistic effect, the modified water-based emulsified asphalt can react with the water-based epoxy resin to form a three-dimensional network structure, and the compatibility between the modified water-based emulsified asphalt and the water-based epoxy resin is improved, so that the stability, the mechanical property and the corrosion resistance of the coating are improved.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to colored road surface anti-skid coatings, and more particularly to a water-based epoxy asphalt colored road surface anti-skid coating and its preparation method. Background Technology

[0002] Colored pavements can effectively reduce visual fatigue for drivers and passengers by utilizing brightly colored surfaces, while also serving as a traffic warning and guidance system to reduce the frequency of traffic accidents. Furthermore, colored pavements can beautify the urban environment and easily distinguish different functional areas; these numerous advantages have led to the increasingly widespread use of colored roads.

[0003] Colored pavement boasts high overall performance indicators, exhibiting excellent anti-skid properties, and is also known as colored anti-skid pavement, commonly used on urban roads and highways. Currently, many colored pavement anti-skid coatings on the market are primarily oil-based epoxy asphalt coatings. Oil-based epoxy asphalt coatings offer good application performance and relatively simple preparation processes, leading to their large-scale application in the early stages of colored pavement development. However, oil-based epoxy asphalt coatings contain a large amount of organic solvents, which release harmful gases during production and construction, posing a threat to the environment and human health. With increasingly stringent environmental protection requirements, water-based epoxy asphalt coatings have gradually become a research hotspot.

[0004] Waterborne epoxy asphalt coatings combine the high strength and adhesion of epoxy resin with the excellent waterproof and anti-corrosion properties of asphalt, offering advantages such as environmental friendliness, safety, and ease of application. However, some problems exist in the preparation process of waterborne epoxy asphalt coatings, such as poor compatibility between epoxy resin and asphalt, poor stability, corrosion resistance, and mechanical properties of the coating, as well as slow drying speed, which affect its application range.

[0005] To address the aforementioned issues, researchers in the coatings field have conducted extensive studies. For example, Chinese Patent Publication No. CN119552578A discloses a waterborne epoxy resin coating and its preparation method. This waterborne epoxy resin coating, by weight, comprises: 15-25 parts by weight of epoxy composite resin emulsion, 100 parts by weight of emulsified asphalt, 3-5 parts by weight of curing agent, and 6-10 parts by weight of water. The epoxy composite resin emulsion is obtained by reacting 30-60 parts by weight of epoxy resin, 2-3 parts by weight of emulsifier, 6-9 parts by weight of acrylate composition, and 1.4-1.6 parts by weight of stabilizer. The acrylate composition is obtained by reacting 15-16 parts by weight of butyl methacrylate and 10-12 parts by weight of 2... This invention patent describes a process where an epoxy composite resin emulsion is prepared by prepolymerizing isopropyl aniline, 5-7 parts by weight of allyl glycidyl ether, and 1-1.2 parts by weight of allyl cage-like polyhedral oligomeric silsesquioxane, followed by 1-3 parts by weight of acrylic acid. The process involves adding an acrylate copolymer to an aqueous epoxy resin coating and reacting it with epoxy resin, emulsifier, and stabilizer to create an epoxy composite resin emulsion. Further reaction with emulsified asphalt, curing agent, and water produces an aqueous epoxy resin coating with improved toughness and hardness. Modification of the epoxy resin enhances its compatibility with asphalt. However, this method involves a complex reaction process and high cost. Furthermore, the compatibility between the acrylate copolymer and epoxy resin may be problematic, potentially leading to phase separation during the composite reaction and subsequent emulsion storage, resulting in decreased stability and mechanical properties of the coating. Chinese patent CN110551451A discloses a water-based two-component epoxy asphalt coating, comprising component A and component B. Component A, by weight, includes: water-based epoxy emulsion, dispersant, wetting agent, defoamer, filler, film-forming aid, rheology modifier, and deionized water. Component B, by weight, includes: epoxy curing agent and emulsified asphalt. This coating is environmentally friendly and non-toxic, exhibits strong corrosion resistance, good storage stability, and a fine texture. It can be used for spraying and has good drying performance. However, the mechanical properties of the coating and the compatibility between the water-based epoxy emulsion and asphalt need further improvement. Therefore, developing a water-based epoxy asphalt colored pavement anti-skid coating with excellent stability, corrosion resistance, mechanical properties, and drying performance, and its preparation method, are currently urgent technical problems to be solved by researchers. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a water-based epoxy asphalt colored pavement anti-skid coating and its preparation method. This application improves the stability, corrosion resistance, mechanical properties, and drying properties of the coating by modifying water-based emulsified asphalt and the filler nano-silica.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A water-based epoxy asphalt colored pavement anti-skid coating, comprising component A, component B, and component C, wherein component A, by weight, comprises: 35-50 parts water-based epoxy resin, 25-40 parts modified water-based emulsified asphalt, 5-15 parts filler, 0.8-1 parts zinc chloride, 0.5-2 parts wetting agent, 0.3-0.6 parts thickener, 0.4-0.8 parts dispersant, 0.2-0.3 parts defoamer, 0.3-0.5 parts anti-settling agent, and 8-10 parts pigment; component B, by weight, comprises: 8-12 parts composite curing agent; and component C comprises: anti-skid aggregate.

[0008] Furthermore, the modified water-based emulsified asphalt is obtained by the following preparation method: (1) Under stirring conditions, aminopolysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate are added to water-based emulsified asphalt, and the mixture is stirred and reacted at 130-150℃ for 1.5-2.5h to obtain aminopolysiloxane modified asphalt; wherein, the mass ratio of water-based emulsified asphalt, aminopolysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate is 1:(0.2-0.45):(0.015-0.03):(0.008-0.01); (2) Disperse nano-titanium dioxide in N,N-dimethylformamide, add γ-(2,3-epoxypropoxy)propyltrimethoxysilane, stir and react at 50-60℃ for 1-2 h to obtain coupling agent modified nano-titanium dioxide; wherein, the mass ratio of nano-titanium dioxide to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:(1.8-3); (3) Add the coupling agent modified nano-titanium dioxide obtained in step (2) to the amino polysiloxane modified asphalt obtained in step (1), and stir and react at 65-80℃ for 3.5-4.5h to obtain modified water-based emulsified asphalt; wherein, the mass ratio of coupling agent modified nano-titanium dioxide to amino polysiloxane modified asphalt is (1-1.5):(3.5-5).

[0009] Specifically, this invention first modifies asphalt with amino-polysiloxane to obtain amino-polysiloxane-modified asphalt. Then, titanium dioxide modified with a silane coupling agent is grafted onto the amino-polysiloxane-modified asphalt via a surface grafting reaction to obtain modified waterborne emulsified asphalt. The modified asphalt surface is grafted with nano-titanium dioxide modified with amino-polysiloxane and the coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The amino groups in the amino-polysiloxane can react with the epoxy groups in the waterborne epoxy resin to form a three-dimensional cross-linked network structure, improving the interfacial bonding force between the waterborne epoxy resin and the waterborne emulsified asphalt. On the other hand, it can also react with the silane coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The epoxy reaction on the surface of propyltrimethoxysilane-modified nano-titanium dioxide allows titanium dioxide to be grafted onto the asphalt surface, enabling the modified nano-titanium dioxide to be uniformly distributed within the coating, forming a three-dimensional network reinforcement structure. It also interacts with waterborne epoxy resin and waterborne emulsified asphalt, significantly improving the mechanical properties of the coating. Simultaneously, the introduction and modification of nano-titanium dioxide also enhances the coating's corrosion resistance. Furthermore, the small particle size and large specific surface area of ​​nano-titanium dioxide allow it to fill pores and defects in the coating, forming a dense shielding layer that effectively blocks the penetration of corrosive media (such as moisture, oxygen, and salt ions). In addition, after modification with a silane coupling agent, strong chemical bonds are formed between the nano-titanium dioxide and the coating matrix, further improving the coating's stability, delaying corrosion reactions, and thus extending its service life. The modified waterborne emulsified asphalt incorporates the silane coupling agent γ-(2,3-epoxypropoxy) Propyltrimethoxysilane introduces epoxy groups, which can undergo ring-opening addition reactions with hydroxyl, carboxyl, or amine groups in waterborne epoxy resins to form covalent bonds, further enhancing the interfacial bonding between waterborne epoxy resins and waterborne emulsified asphalt, thereby improving the stability, corrosion resistance, and mechanical properties of the coating.

[0010] Furthermore, the filler is modified nano-silica, and the preparation method of the modified nano-silica is as follows: 1) The silane coupling agent γ-aminopropyltriethoxysilane is slowly added to ethanol while stirring until the silane coupling agent is completely dissolved. Then, nano-silica is added, ultrasonically dispersed, and reacted at 60-70℃ for 2-4 hours to obtain silane coupling agent modified nano-silica. The ratio of nano-silica to silane coupling agent to ethanol is 1:(0.1-0.2):(10-22). 2) Isophorone diisocyanate, polytetramethylene ether glycol, and dibutyltin dilaurate catalyst are added to N,N-dimethylacetamide and reacted at 68-78℃ for 2.5-4.5 h to obtain a polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate to polytetramethylene ether glycol is (1.5-2.5):(0.4-0.6), and the amount of dibutyltin dilaurate catalyst is 0.03-0.05% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol; 3) Add chain extender methyldiethanolamine and silane coupling agent modified nano-silica obtained in step 1) sequentially to the polyurethane prepolymer solution obtained in step 2), and react at 55-65℃ for 8-12h to obtain modified nano-silica; wherein, the mass ratio of polyurethane prepolymer solution, chain extender methyldiethanolamine, and silane coupling agent modified nano-silica is 100:(1-1.5):(0.8-1.2).

[0011] Specifically, this application first pre-modifies nano-silica using the silane coupling agent γ-aminopropyltriethoxysilane. Then, the -NHCOO- groups on the surface of the synthesized polyurethane react chemically with the amino groups on the surface of the γ-aminopropyltriethoxysilane-modified nano-silica to obtain modified nano-silica. The modified nano-silica contains a polyurethane structure. The urethane groups (-NHCOO-) in the polyurethane structure can form crosslinking points with the epoxy groups in the waterborne epoxy resin and modified asphalt through chemical bonds (such as hydrogen bonds and covalent bonds). This intermolecular interaction can form an interpenetrating three-dimensional network structure during the coating curing process, effectively improving the interfacial bonding force between the waterborne epoxy resin and the modified waterborne emulsified asphalt, thereby improving the raw material... The mechanical properties and corrosion resistance of the coating are improved. Simultaneously, during the mixing of the coating raw materials, the silicon-oxygen bonds on the surface of modified nano-silica and the silicon-oxygen bonds in the amino-polysiloxane on the surface of modified water-based emulsified asphalt hydrolyze, forming a silsesquioxane structure under the action of zinc chloride. This silsesquioxane structure enhances the chemical stability and mechanical properties of the coating. Furthermore, nano-silica, as a filler, can synergistically enhance the effects of nano-titanium dioxide in modified water-based emulsified asphalt, filling pores and defects in the coating to form a dense shielding layer. This effectively blocks the penetration of corrosive media (such as moisture, oxygen, and salt ions), improving the corrosion resistance and stability of the coating. The synergistic effect of titanium dioxide and silica can also improve the adhesion properties of the coating, thus helping to improve its anti-slip properties.

[0012] Further, the wetting agent is any one or more of polyethylene glycol, sodium dodecyl sulfate, and the Tween series; the thickener is one or more of hydroxyethyl cellulose, hydroxypropyl cellulose, and polyacrylate thickeners; the dispersant is any one or a combination of two of the ammonium salt or sodium salt solutions of acrylate copolymers, selected from any one or more of BYK-154, DISPERBYK-191, and DISPERBYK-192.

[0013] Furthermore, the defoamer is any one or two of polyether siloxane copolymer and mineral oil defoamer; the anti-settling agent is any one or more of bentonite, polyamide wax and polyethylene wax; Furthermore, the composite curing agent is a mixture of a polyamide curing agent and dicyandiamide at a mass ratio of (1-3.5):1.

[0014] Furthermore, the anti-slip aggregate is either ceramic particles with a particle size of 0.5-3 mm or corundum particles with a particle size of 0.5-3 mm, which have the same or similar color as the liquid binder. Furthermore, a method for preparing the above-mentioned waterborne epoxy asphalt colored pavement anti-skid coating includes the following steps: Step S1: First, mix the water-based epoxy resin, water-based emulsified asphalt, and filler in component A under the action of zinc chloride. After mixing evenly, add wetting agent, thickener, dispersant, defoamer, anti-settling agent, and pigment and stir to mix evenly to obtain component A slurry, which is then ready for use. Step S2: Mix the A component slurry obtained in step S1 with the composite curing agent in component B to obtain a liquid binder for later use. Step S3: Spray the liquid binder obtained in step S2 evenly on the road surface at a spraying rate of 0.5-2.5 kg / m². At the same time, spread the anti-skid aggregate in component C evenly on the liquid binder sprayed on the road surface at a spreading rate of 0.5-3 kg / m². After the liquid binder dries and cures, the water-based epoxy asphalt colored pavement anti-skid coating is obtained.

[0015] Furthermore, in step S1, the stirring speed is 1000-1500 r / min, and the stirring time is 30-60 min.

[0016] Furthermore, in step S2, the stirring speed is 400-600 r / min, and the stirring time is 40-60 min.

[0017] Compared with the prior art, the positive and beneficial effects of this invention are as follows: (1) In this invention, asphalt is first modified with aminopolysiloxane to obtain aminopolysiloxane-modified asphalt. Then, titanium dioxide modified with silane coupling agent is grafted onto the aminopolysiloxane-modified asphalt through a surface grafting reaction to obtain modified waterborne emulsified asphalt. The modified asphalt surface is grafted with aminopolysiloxane and nano-titanium dioxide modified with coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The amino groups in the aminopolysiloxane can react with the epoxy groups in the waterborne epoxy resin to form a three-dimensional cross-linked network structure, which improves the interfacial bonding force between the waterborne epoxy resin and the waterborne emulsified asphalt. On the other hand, it can react with the silane coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The epoxy reaction on the surface of propyltrimethoxysilane-modified nano-titanium dioxide allows titanium dioxide to be grafted onto the asphalt surface, enabling the modified nano-titanium dioxide to be uniformly distributed within the coating, forming a three-dimensional network reinforcement structure. It also interacts with waterborne epoxy resin and waterborne emulsified asphalt, significantly improving the mechanical properties of the coating. Simultaneously, the introduction and modification of nano-titanium dioxide also enhances the coating's corrosion resistance. Furthermore, the small particle size and large specific surface area of ​​nano-titanium dioxide allow it to fill pores and defects in the coating, forming a dense shielding layer that effectively blocks the penetration of corrosive media (such as moisture, oxygen, and salt ions). In addition, after modification with a silane coupling agent, strong chemical bonds are formed between the nano-titanium dioxide and the coating matrix, further improving the coating's stability, delaying corrosion reactions, and thus extending its service life. The modified waterborne emulsified asphalt incorporates the silane coupling agent γ-(2,3-epoxypropoxy) Propyltrimethoxysilane introduces epoxy groups, which can undergo ring-opening addition reactions with hydroxyl, carboxyl, or amine groups in waterborne epoxy resins to form covalent bonds, further enhancing the interfacial bonding between waterborne epoxy resins and waterborne emulsified asphalt, thereby improving the stability, corrosion resistance, and mechanical properties of the coating.

[0018] (2) This application first uses the silane coupling agent γ-aminopropyltriethoxysilane to pre-modify nano-silica, and then chemically reacts the -NHCOO- groups on the surface of the synthesized polyurethane with the amino groups on the surface of the γ-aminopropyltriethoxysilane-premodified nano-silica to obtain modified nano-silica. The modified nano-silica contains a polyurethane structure. The urethane groups (-NHCOO-) in the polyurethane structure can form crosslinking points with the epoxy groups in the waterborne epoxy resin and modified asphalt through chemical bonds (such as hydrogen bonds and covalent bonds). This intermolecular interaction force can form an interpenetrating three-dimensional network structure during the coating curing process, which effectively improves the interfacial bonding force between the waterborne epoxy resin and the modified waterborne emulsified asphalt, thereby improving the raw material... The mechanical properties and corrosion resistance of the coating are improved. Simultaneously, during the mixing of the coating raw materials, the silicon-oxygen bonds on the surface of modified nano-silica and the silicon-oxygen bonds in the amino-polysiloxane on the surface of modified water-based emulsified asphalt hydrolyze, forming a silsesquioxane structure under the action of zinc chloride. This silsesquioxane structure enhances the chemical stability and mechanical properties of the coating. Furthermore, nano-silica, as a filler, can synergistically enhance the effects of nano-titanium dioxide in modified water-based emulsified asphalt, filling pores and defects in the coating to form a dense shielding layer. This effectively blocks the penetration of corrosive media (such as moisture, oxygen, and salt ions), improving the corrosion resistance and stability of the coating. The synergistic effect of titanium dioxide and silica can also improve the adhesion properties of the coating, thus helping to improve its anti-slip properties.

[0019] (3) The present invention employs a multi-component synergistic enhancement system to improve the performance of the modified waterborne emulsion. Asphalt can react with water-based epoxy resin to form a three-dimensional network structure, which improves the properties of both. Asphalt can react with water-based epoxy resin to form a three-dimensional network structure, which improves the compatibility between the two and significantly enhances the stability, mechanical properties (tensile strength, elongation at break), and corrosion resistance of the coating. At the same time, polyamide curing agents and latent dicyandiamide are compounded in a ratio of (1-3.5):1, which balances rapid curing at room temperature (rapid ring-opening reaction of polyamide) and deep cross-linking at high temperature (high-temperature release of active groups by dicyandiamide), shortening the drying time of the coating and improving its hardness and chemical corrosion resistance.

[0020] (4) The coating system of the present invention does not contain organic solvents, and no harmful gases are emitted during the production and construction process, which meets the environmental protection requirements. At the same time, the preparation process is simple and suitable for industrial production. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below through embodiments. These embodiments are for illustrative purposes only and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Unless otherwise specified, the experimental methods described in the embodiments are conventional methods; unless otherwise specified, the reagents and materials are commercially available.

[0023] Example 1 A water-based epoxy asphalt colored pavement anti-skid coating, comprising component A, component B, and component C. Component A, by weight, comprises: 35 parts water-based epoxy resin, 25 parts modified water-based emulsified asphalt, 5 parts modified nano-silica, 0.8 parts zinc chloride, 0.5 parts wetting agent polyethylene glycol, 0.3 parts thickener hydroxyethyl cellulose, 0.4 parts dispersant BYK-154, 0.2 parts defoamer polyether siloxane copolymer, 0.3 parts anti-settling agent bentonite, and 8 parts pigment. Component B, by weight, comprises: 8 parts of a composite curing agent (polyamide curing agent) and dicyandiamide compounded at a mass ratio of 1:1. Component C comprises: anti-skid aggregate ceramic particles with a particle size of 0.5-3 mm, having the same color as the liquid binder.

[0024] The modified water-based emulsified asphalt is obtained by the following preparation method: (1) Add amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate to waterborne emulsified asphalt under stirring conditions, and stir and react at 130°C for 2.5 h to obtain amino polysiloxane modified asphalt; wherein, the mass ratio of waterborne emulsified asphalt, amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate is 1:0.2:0.015:0.008; (2) Disperse nano-titanium dioxide in N,N-dimethylformamide, add γ-(2,3-epoxypropoxy)propyltrimethoxysilane, stir and react at 50°C for 2 h to obtain coupling agent modified nano-titanium dioxide; wherein, the mass ratio of nano-titanium dioxide to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:1.8; (3) Add the coupling agent-modified nano-titanium dioxide obtained in step (2) to the amino-polysiloxane-modified asphalt obtained in step (1), and stir and react at 65°C to obtain modified water-based emulsified asphalt for 4.5 h. The mass ratio of coupling agent-modified nano-titanium dioxide to amino-polysiloxane-modified asphalt is 1:3.5.

[0025] The specific preparation method of modified nano-silica is as follows: 1) The silane coupling agent γ-aminopropyltriethoxysilane was slowly added to ethanol while stirring until the silane coupling agent was completely dissolved. Then, nano-silica was added, ultrasonically dispersed, and reacted at 70°C for 2 hours to obtain silane coupling agent modified nano-silica. The ratio of nano-silica to silane coupling agent to ethanol was 1:0.1:10. 2) Isophorone diisocyanate, polytetramethylene ether glycol, and dibutyltin dilaurate catalyst were added to N,N-dimethylacetamide and reacted at 68°C for 4.5 h to obtain a polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate to polytetramethylene ether glycol was 1.5:0.4, and the amount of dibutyltin dilaurate catalyst was 0.03% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol; 3) Add chain extender methyldiethanolamine and silane coupling agent modified nano-silica obtained in step 1) sequentially to the polyurethane prepolymer solution obtained in step 2), and react at 55°C for 12 h to obtain modified nano-silica; wherein, the mass ratio of polyurethane prepolymer solution, chain extender methyldiethanolamine and silane coupling agent modified nano-silica is 100:1:0.8.

[0026] A method for preparing a water-based epoxy asphalt colored pavement anti-skid coating includes the following steps: Step S1: First, mix the waterborne epoxy resin, waterborne emulsified asphalt, and modified nano-dioxide in component A with zinc chloride. After mixing evenly, add wetting agent, thickener, dispersant, defoamer, anti-settling agent, and pigment and stir evenly. The stirring speed is 1000 r / min and the stirring time is 60 min to obtain component A slurry for later use. Step S2: Mix the A component slurry obtained in step S1 with the composite curing agent in component B until homogeneous. The mixing speed is 400 r / min and the mixing time is 60 min to obtain a liquid binder for later use. Step S3: Spray the liquid binder obtained in step S2 evenly on the road surface at a spraying rate of 0.5-2.5 kg / m². At the same time, spread the anti-skid aggregate in component C evenly on the liquid binder sprayed on the road surface at a spreading rate of 0.5-3 kg / m². After the liquid binder dries and cures, the water-based epoxy asphalt colored pavement anti-skid coating is obtained.

[0027] Example 2 A water-based epoxy asphalt colored pavement anti-skid coating, comprising component A, component B, and component C. Component A, by weight, comprises: 40 parts water-based epoxy resin, 35 parts modified water-based emulsified asphalt, 10 parts modified nano-silica, 0.9 parts zinc chloride, 1.5 parts wetting agent sodium dodecyl sulfate, 0.5 parts thickener hydroxypropyl cellulose, 0.6 parts dispersant DISPERBYK-191, 0.25 parts defoamer polyether siloxane copolymer, 0.4 parts anti-settling agent polyamide wax, and 9 parts pigment. Component B, by weight, comprises: 10 parts of a composite curing agent, which is a polyamide curing agent and dicyandiamide compounded at a mass ratio of 2:1. Component C comprises: anti-skid aggregate consisting of 0.5-3 mm diamond abrasive particles with the same color as the liquid binder.

[0028] The modified water-based emulsified asphalt is obtained by the following preparation method: (1) Add amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate to waterborne emulsified asphalt under stirring conditions, and stir and react at 140°C for 2 hours to obtain amino polysiloxane modified asphalt; wherein, the mass ratio of waterborne emulsified asphalt, amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate is 1:0.3:0.02:0.009; (2) Disperse nano-titanium dioxide in N,N-dimethylformamide, add γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and stir the reaction at 55°C for 1.5 h to obtain coupling agent modified nano-titanium dioxide; wherein, the mass ratio of nano-titanium dioxide to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:2.5; (3) Add the coupling agent-modified nano-titanium dioxide obtained in step (2) to the aminopolysiloxane-modified asphalt obtained in step (1), and stir and react at 70°C for 4 hours to obtain modified water-based emulsified asphalt. The mass ratio of coupling agent-modified nano-titanium dioxide to aminopolysiloxane-modified asphalt is 2:4.5.

[0029] The specific preparation method of modified nano-silica is as follows: 1) The silane coupling agent γ-aminopropyltriethoxysilane was slowly added to ethanol while stirring until the silane coupling agent was completely dissolved. Then, nano-silica was added, ultrasonically dispersed, and reacted at 65°C for 3 hours to obtain silane coupling agent modified nano-silica. The ratio of nano-silica to silane coupling agent to ethanol was 1:0.15:18. 2) Isophorone diisocyanate, polytetramethylene ether glycol, and dibutyltin dilaurate catalyst were added to N,N-dimethylacetamide and reacted at 72°C for 3.5 h to obtain a polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate to polytetramethylene ether glycol was 2:0.5, and the amount of dibutyltin dilaurate catalyst was 0.04% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol; 3) Add chain extender methyldiethanolamine and silane coupling agent modified nano silica obtained in step 1) sequentially to the polyurethane prepolymer solution obtained in step 2), and react at 60°C for 10 h to obtain modified nano silica; wherein, the mass ratio of polyurethane prepolymer solution, chain extender methyldiethanolamine and silane coupling agent modified nano silica is 100:1.2:1.

[0030] A method for preparing a water-based epoxy asphalt colored pavement anti-skid coating includes the following steps: Step S1: First, mix the water-based epoxy resin, water-based emulsified asphalt, and modified nano-silica in component A with zinc chloride. After mixing evenly, add wetting agent, thickener, dispersant, defoamer, anti-settling agent, and pigment and stir evenly. The stirring speed is 1200 r / min and the stirring time is 45 min to obtain component A slurry for later use. Step S2: Mix the A component slurry obtained in step S1 with the composite curing agent in component B until homogeneous. The mixing speed is 500 r / min and the mixing time is 50 min to obtain a liquid binder for later use. Step S3: Spray the liquid binder obtained in step S2 evenly on the road surface at a spraying rate of 0.5-2.5 kg / m². At the same time, spread the anti-skid aggregate in component C evenly on the liquid binder sprayed on the road surface at a spreading rate of 0.5-3 kg / m². After the liquid binder dries and cures, the water-based epoxy asphalt colored pavement anti-skid coating is obtained.

[0031] Example 3 A water-based epoxy asphalt colored pavement anti-skid coating, comprising component A, component B, and component C. Component A, by weight, comprises: 50 parts water-based epoxy resin, 40 parts modified water-based emulsified asphalt, 15 parts modified nano-silica, 1 part zinc chloride, 2 parts Tween series wetting agent, 0.6 parts polyacrylate thickener, 0.8 parts dispersant DISPERBYK-192, 0.3 parts mineral oil defoamer, 0.5 parts anti-settling agent polyethylene wax, and 10 parts pigment. Component B, by weight, comprises: 12 parts of a composite curing agent, which is a polyamide curing agent and dicyandiamide compounded at a mass ratio of 3.5:1. Component C comprises: anti-skid aggregate consisting of ceramic particles with a particle size of 0.5-3 mm and a color similar to the liquid.

[0032] The modified water-based emulsified asphalt is obtained by the following preparation method: (1) Aminopolysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate were added to waterborne emulsified asphalt under stirring conditions, and the mixture was stirred and reacted at 150°C for 1.5 h to obtain aminopolysiloxane modified asphalt; wherein, the mass ratio of waterborne emulsified asphalt, aminopolysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate was 1:0.45:0.03:0.01; (2) Disperse nano-titanium dioxide in N,N-dimethylformamide, add γ-(2,3-epoxypropoxy)propyltrimethoxysilane, stir and react at 60°C for 1 h to obtain coupling agent modified nano-titanium dioxide; wherein, the mass ratio of nano-titanium dioxide to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:3; (3) Add the coupling agent-modified nano-titanium dioxide obtained in step (2) to the aminopolysiloxane-modified asphalt obtained in step (1), and stir and react at 80°C for 3.5 h to obtain modified water-based emulsified asphalt. The mass ratio of coupling agent-modified nano-titanium dioxide to aminopolysiloxane-modified asphalt is 1.5:5.

[0033] The specific preparation method of modified nano-silica is as follows: 1) The silane coupling agent γ-aminopropyltriethoxysilane was slowly added to ethanol while stirring until the silane coupling agent was completely dissolved. Then, nano-silica was added, ultrasonically dispersed, and reacted at 70°C for 2 hours to obtain silane coupling agent modified nano-silica. The ratio of nano-silica to silane coupling agent to ethanol was 1:0.1:22. 2) Isophorone diisocyanate, polytetramethylene ether glycol, and dibutyltin dilaurate catalyst were added to N,N-dimethylacetamide and reacted at 78°C for 2.5 h to obtain a polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate to polytetramethylene ether glycol was 2.5:0.6, and the amount of dibutyltin dilaurate catalyst was 0.05% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol; 3) Add chain extender methyldiethanolamine and silane coupling agent modified nano-silica obtained in step 1) sequentially to the polyurethane prepolymer solution obtained in step 2), and react at 65°C for 8 hours to obtain modified nano-silica; wherein, the mass ratio of polyurethane prepolymer solution, chain extender methyldiethanolamine, and silane coupling agent modified nano-silica is 100:1.5:1.2.

[0034] A method for preparing a water-based epoxy asphalt colored pavement anti-skid coating includes the following steps: Step S1: First, mix the water-based epoxy resin, water-based emulsified asphalt, and modified nano-silica in component A with zinc chloride. After mixing evenly, add wetting agent, thickener, dispersant, defoamer, anti-settling agent, and pigment and stir evenly. The stirring speed is 1500 r / min and the stirring time is 30 min to obtain component A slurry for later use. Step S2: Mix the A component slurry obtained in step S1 with the composite curing agent in component B until homogeneous. The mixing speed is 600 r / min and the mixing time is 60 min to obtain a liquid binder for later use. Step S3: Spray the liquid binder obtained in step S2 evenly on the road surface at a spraying rate of 0.5-2.5 kg / m². At the same time, spread the anti-skid aggregate in component C evenly on the liquid binder sprayed on the road surface at a spreading rate of 0.5-3 kg / m². After the liquid binder dries and cures, the water-based epoxy asphalt colored pavement anti-skid coating is obtained.

[0035] Comparative Example 1 This comparative example is the same as Example 2, except that the water-based emulsified asphalt was not modified.

[0036] Comparative Example 2 This comparative example is the same as Example 2, except that the method for modifying the water-based emulsified asphalt in this comparative example is different from that in Example 2. The specific method for modifying the water-based emulsified asphalt in this comparative example is as follows: Amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate were added to waterborne emulsified asphalt under stirring conditions, and the mixture was stirred and reacted at 140°C for 2 hours to obtain waterborne emulsified asphalt; wherein the mass ratio of waterborne emulsified asphalt, amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate was 1:0.3:0.02:0.009.

[0037] Comparative Example 3 This comparative example is the same as Example 2, except that the filler is unmodified nano-silica.

[0038] Comparative Example 4 This comparative example is the same as Example 2, except that the modification method of the filler-modified nano-silica differs from that in Example 2. The specific modification method of the filler-modified nano-silica in this comparative example is as follows: 1) The silane coupling agent γ-aminopropyltriethoxysilane was slowly added to ethanol while stirring until the silane coupling agent was completely dissolved. Then, nano-silica was added, ultrasonically dispersed, and reacted at 65°C for 3 hours to obtain modified nano-silica. The ratio of nano-silica to silane coupling agent to ethanol was 1:0.15:18.

[0039] Comparative Example 5 This comparative example is the same as Example 2, except that the modification method of the filler-modified nano-silica differs from that in Example 2. The specific modification method of the filler-modified nano-silica in this comparative example is as follows: 1) Isophorone diisocyanate, polytetramethylene ether glycol, and dibutyltin dilaurate catalyst were added to N,N-dimethylacetamide and reacted at 72°C for 3.5 h to obtain a polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate to polytetramethylene ether glycol was 2:0.5, and the amount of dibutyltin dilaurate catalyst was 0.04% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol; 2) Add chain extender methyldiethanolamine and nano silica sequentially to the polyurethane prepolymer solution obtained in step 1), and react at 60°C for 10 h to obtain modified nano silica; wherein, the mass ratio of polyurethane prepolymer solution, chain extender methyldiethanolamine and nano silica is 100:1.2:1.

[0040] Skid resistance test: The skid resistance of pavement asphalt samples was evaluated by referring to the pendulum tester method in the "Specifications for Field Testing of Highway Subgrade and Pavement" (JTG3450-2019). The pendulum value of different pavement asphalt samples was tested, and the test instrument was a pendulum friction tester.

[0041] Examples 1-3 and Comparative Example 1 For the test methods of other performance parameters of the coatings, please refer to "Test Methods for Waterproof Coatings for Buildings" (GB / T 16777). (2008), the specific test results for each performance parameter are as follows: Table 1 Examples 1-3 and Comparative Example 1 5 Performance parameters of coatings

[0042] As can be seen from the data in Table 1, the stability, mechanical properties, water resistance, corrosion resistance, and drying performance of the waterborne epoxy asphalt colored pavement anti-skid coatings prepared in Examples 1-3 of this application are all superior to those of Comparative Examples 1-5. A comparison of Comparative Examples 1 and 2 with Example 2 shows that... The modified asphalt surface of this invention is grafted with amino-polysiloxane and nano-titanium dioxide modified with the coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The amino groups in the amino-polysiloxane can react with the epoxy groups in the waterborne epoxy resin to form a three-dimensional cross-linked network structure, improving the interfacial bonding force between the waterborne epoxy resin and the waterborne emulsified asphalt, thereby improving the mechanical properties of the coating. Furthermore, it can react with the silane coupling agent γ-(2,3-epoxypropoxy) The epoxy reaction on the surface of propyltrimethoxysilane-modified nano-titanium dioxide allows titanium dioxide to be grafted onto the asphalt surface, enabling the modified nano-titanium dioxide to be uniformly distributed within the coating, forming a three-dimensional network reinforcement structure. It also interacts with waterborne epoxy resin and waterborne emulsified asphalt, significantly improving the mechanical properties of the coating. Simultaneously, the introduction and modification of nano-titanium dioxide also enhances the coating's corrosion resistance. Furthermore, the small particle size and large specific surface area of ​​nano-titanium dioxide allow it to fill pores and defects in the coating, forming a dense shielding layer that effectively blocks the penetration of corrosive media (such as moisture, oxygen, and salt ions). In addition, after modification with a silane coupling agent, strong chemical bonds are formed between the nano-titanium dioxide and the coating matrix, further improving the coating's stability, delaying corrosion reactions, and thus extending its service life. The modified waterborne emulsified asphalt incorporates the silane coupling agent γ-(2,3-epoxypropoxy) Propyltrimethoxysilane introduces epoxy groups, which can undergo ring-opening addition reactions with hydroxyl, carboxyl, or amine groups in waterborne epoxy resins to form covalent bonds, further enhancing the interfacial bonding between waterborne epoxy resins and waterborne emulsified asphalt, thereby improving the stability, corrosion resistance, and mechanical properties of the coating.Comparing Comparative Examples 3-5 with Example 2, it can be seen that the modified nano-silica of the present invention contains a polyurethane structure. The urethane groups (-NHCOO-) in the polyurethane structure can form crosslinking points with the epoxy groups in the waterborne epoxy resin and modified asphalt through chemical bonds (such as hydrogen bonds and covalent bonds). This intermolecular interaction force can form an interpenetrating three-dimensional network structure during the coating curing process, effectively improving the interfacial bonding force between the waterborne epoxy resin and the modified waterborne emulsified asphalt, thereby improving the mechanical properties and corrosion resistance of the raw materials. At the same time, when the raw materials of the coating are mixed, the silicon-oxygen bonds on the surface of the modified nano-silica... The hydrolysis of siloxane bonds in the aminopolysiloxane on the surface of modified waterborne emulsified asphalt, under the action of zinc chloride, can form a silsesquioxane structure. This silsesquioxane structure can enhance the chemical stability and mechanical properties of the coating. Moreover, nano-silica, as a filler, can have a synergistic effect with nano-titanium dioxide in the modified waterborne emulsified asphalt. It can fill the pores and defects in the coating, forming a dense shielding layer, effectively blocking the penetration of corrosive media (such as moisture, oxygen, salt ions, etc.), improving the corrosion resistance and stability of the coating. Furthermore, the synergistic effect of titanium dioxide and silica can also improve the adhesion of the coating, thereby helping to improve the anti-slip performance of the coating.

[0043] Finally, it should be noted that although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An aqueous epoxy asphalt colored pavement antiskid coating material comprising a component A, a component B and a component C, characterized in that, The A component includes, in parts by weight, water-based epoxy resin 35-50 parts, modified water-based emulsified asphalt 25-40 parts, filler 5-15 parts, zinc chloride 0.8-1 part, wetting agent 0.5-2 parts, thickening agent 0.3-0.6 parts, dispersing agent 0.4-0.8 parts, defoaming agent 0.2-0.3 parts, anti-settling agent 0.3-0.5 parts, and pigment 8-10 parts; the B component includes, in parts by weight, composite curing agent 8-12 parts; and the C component includes anti-skid aggregate.

2. The water-based epoxy asphalt colored pavement antiskid coating according to claim 1, characterized in that, The modified water-based emulsified asphalt is obtained by the following preparation method: (1) under stirring, amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate are added to water-based emulsified asphalt, and the mixture is stirred and reacted at 130-150°C for 1.5-2.5h to obtain amino polysiloxane modified asphalt; wherein the mass ratio of water-based emulsified asphalt, amino polysiloxane, crosslinking agent tetraethyl orthosilicate, and catalyst dibutyltin dilaurate is 1:(0.2-0.45):(0.015-0.03):(0.008-0.01); (2) nano titanium dioxide is dispersed in N,N-dimethylformamide, and γ-(2,3-epoxypropoxy) propyl trimethoxysilane is added, and the mixture is stirred and reacted at 50-60°C for 1-2h to obtain coupling agent modified nano titanium dioxide; wherein the mass ratio of nano titanium dioxide and γ-(2,3-epoxypropoxy) propyl trimethoxysilane is 1:(1.8-3); (3) the coupling agent modified nano titanium dioxide obtained in step (2) is added to the amino polysiloxane modified asphalt obtained in step (1), and the mixture is stirred and reacted at 65-80°C for 3.5-4.5h to obtain modified water-based emulsified asphalt; wherein the mass ratio of coupling agent modified nano titanium dioxide and amino polysiloxane modified asphalt is (1-1.5):(3.5-5).

3. The water-based epoxy asphalt colored pavement antiskid coating according to claim 1, characterized in that, The filler is modified nano silicon dioxide, and the modified nano silicon dioxide is prepared by the following method: 1) silane coupling agent γ-aminopropyl triethoxysilane is slowly added to ethanol, and the mixture is stirred until the silane coupling agent is completely dissolved, then nano silicon dioxide is added, and the mixture is ultrasonically dispersed and reacted at 60-70°C for 2-4h to obtain silane coupling agent modified nano silicon dioxide; wherein the amount ratio of nano silicon dioxide, silane coupling agent, and ethanol is 1:(0.1-0.2):(10-22); 2) isophorone diisocyanate, polytetramethylene ether glycol, and catalyst dibutyltin dilaurate are added to N,N dimethylacetamide, and the mixture is reacted at 68-78°C for 2.5-4.5h to obtain polyurethane prepolymer solution; wherein the molar ratio of isophorone diisocyanate and polytetramethylene ether glycol is (1.5-2.5):(0.4-0.6), and the amount of catalyst dibutyltin dilaurate is 0.03-0.05% of the total mass of isophorone diisocyanate and polytetramethylene ether glycol. 3) adding chain extender methyldiethanolamine and silane coupling agent modified nano-silica obtained in step 1) into the polyurethane prepolymer solution obtained in step 2) in sequence, and reacting at a temperature of 55-65℃ for 8-12h to obtain modified nano-silica; wherein the mass ratio of the polyurethane prepolymer solution, the chain extender methyldiethanolamine, and the silane coupling agent modified nano-silica is 100:(1-1.5):(0.8-1.2).

4. The water-based colored epoxy asphalt pavement antiskid coating according to claim 1, characterized in that, The wetting agent is any one or several of polyethylene glycol, sodium dodecyl sulfate, and the Tween series; the thickening agent is any one or more of hydroxyethyl cellulose, hydroxypropyl cellulose, and a polyacrylate thickening agent; the dispersing agent is any one or a combination of two of the ammonium or sodium salt solution of an acrylate copolymer, selected from any one or several of BYK-154, DISPERBYK-191, and DISPERBYK-192.

5. The water-based epoxy asphalt colored pavement antiskid coating material according to claim 1, characterized in that, The defoaming agent is any one or two of a polyether siloxane copolymer and a mineral oil defoaming agent; the anti-settling agent is any one or more of bentonite, polyamide wax, and polyethylene wax.

6. The water-based colored epoxy asphalt pavement antiskid coating according to claim 1, characterized in that, The composite curing agent is a polyamide curing agent compounded with dicyandiamide at a mass ratio of (1-3.5):

1.

7. The water-based colored epoxy asphalt pavement antiskid coating according to claim 1, characterized in that, The anti-skid aggregate is any one of ceramic particles with a particle size of 0.5-3mm or corundum particles with a particle size of 0.5-3mm, which have the same or similar color as the liquid binder.

8. A method for preparing the aqueous epoxy asphalt colored pavement antiskid coating material according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Step S1: first, mix the water-based epoxy resin, water-based emulsified asphalt, and modified filler in the A component under the action of zinc chloride, and then add the wetting agent, thickening agent, dispersing agent, defoaming agent, anti-settling agent, and pigment, and stir and mix them uniformly to obtain the A component slurry, which is ready for use; Step S2: stir and mix the A component slurry obtained in step S1 with the composite curing agent in the B component uniformly to obtain the liquid binder, which is ready for use; Step S3: spray the liquid binder obtained in step S2 on the road surface at a spraying amount of 0.5-2.5kg / m2, and at the same time, evenly spread the anti-skid aggregate in the C component on the liquid binder sprayed on the road surface at a spreading amount of 0.5-3kg / m2, and after the liquid binder is dried and cured, the water-based epoxy asphalt colored road anti-skid coating is obtained.

9. The preparation method of the water-based epoxy asphalt colored pavement antiskid coating according to claim 8, characterized in that, The stirring speed in step S1 is 1000-1500r / min, and the stirring time is 30-60min.

10. The preparation method of the water-based epoxy asphalt colored pavement antiskid coating according to claim 8, characterized in that, The stirring speed in step S2 is 400-600r / min, and the stirring time is 40-60min.

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