Aqueous pavement coating material and method of making

Abstract

The application relates to the technical field of pavement coating material preparation, and particularly discloses a water-based pavement coating material and a preparation method thereof.The water-based pavement coating material is mainly prepared from the following raw materials: water, cellulose nanocrystals, sepiolite, an anti-cracking agent, butadiene rubber, a defoaming agent, a leveling agent, a dispersing agent, pigments, fillers, a curing agent, four-needle-shaped zinc oxide whiskers and a water-based epoxy resin; and the preparation method comprises the following steps: mixing the anti-cracking agent, the butadiene rubber, the sepiolite, the four-needle-shaped zinc oxide whiskers, the water-based epoxy resin and 1 / 3-1 / 2 of the water to obtain a premix; and mixing the premix with the cellulose nanocrystals, the defoaming agent, the dispersing agent, the pigments, the fillers, the curing agent, an adhesion promoter, the leveling agent and the remaining water, so that the water-based pavement coating material is obtained.The water-based pavement coating material prepared by the application has good anti-cracking performance and good wear resistance.

Description

Technical Field

[0001] This application relates to the field of road surface coating material preparation technology, and more specifically, it relates to a water-based road surface coating material and its preparation method. Background Technology

[0002] Currently, in order to reduce traffic accidents in dangerous areas, colored anti-skid pavement is usually applied at road intersections and other places. Colored anti-skid pavement comes in a variety of colors and can effectively prevent skidding and serve as a traffic warning, thereby reducing the accident rate.

[0003] Colored anti-slip pavement typically involves coating the road surface with anti-slip paint. Oil-based anti-slip paints are more commonly used, while water-based anti-slip paints are less so. Oil-based anti-slip paints contain a large amount of volatile organic solvents, posing significant risks to safety, environmental protection, and human health. Therefore, the research and development and promotion of water-based anti-slip paints is imperative.

[0004] When water-based anti-slip coatings are applied to the road surface, the surface layer cures quickly, and the solvent in the underlying layer may evaporate and crack the surface layer, which may easily lead to cracking. Once cracks appear on the road surface, with the continuous influence of natural factors, especially the infiltration of surface water, the road surface strength will decrease rapidly, and the road surface will soon develop problems such as cracking and potholes, which will seriously affect the performance of the road surface.

[0005] Therefore, there is an urgent need to develop a road surface covering material with excellent crack resistance. Summary of the Invention

[0006] To further improve the crack resistance of road surface covering materials, this application provides a water-based road surface covering material and its preparation method.

[0007] In a first aspect, this application provides a water-based pavement overlay material, employing the following technical solution:

[0008] A water-based pavement coating material is mainly composed of the following raw materials in parts by weight: 20-30 parts water, 1-2 parts cellulose nanocrystals, 1-2 parts sepiolite, 3-5 parts anti-cracking agent, 3-5 parts butadiene rubber, 1-2 parts defoamer, 1-2 parts leveling agent, 1-2 parts dispersant, 5-10 parts pigment, 20-25 parts filler, 50-55 parts curing agent, 3-5 parts tetraneedle-shaped zinc oxide whiskers, 100-110 parts water-based epoxy resin, and 1-2 parts adhesion promoter. The anti-cracking agent includes modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber. The preparation method of modified carbon fiber includes the following steps: S1, heating and calcining carbon fiber, cooling to obtain carbon fiber one; S2, mixing carbon fiber one with magnesium nitrate solution to obtain a mixture, adjusting the pH to alkaline, reacting, washing, drying, heating, and cooling to room temperature to obtain carbon fiber two; S3, ball milling and mixing calcium oxide expanding agent, calcium sulfoaluminate expanding agent, and sodium silicate to obtain a mixture, ball milling and mixing the mixture with sepiolite to obtain a repair agent; S4, impregnating carbon fiber two in acrylic emulsion to obtain carbon fiber three; S5, mixing carbon fiber three and the repair agent, drying, and obtaining the final product.

[0009] By adopting the above technical solution, the raw materials and proportions of each raw material in the water-based pavement coating material are adjusted, resulting in a water-based pavement coating material with superior performance. Pigments, fillers, anti-cracking agents, sepiolite, and tetraquid zinc oxide whiskers work together and are dispersed in water-based epoxy resin under the action of dispersants and other raw materials. When coated on the pavement, the resulting coating exhibits excellent wear resistance and crack resistance. The addition of adhesion promoters facilitates interaction with other components of the water-based pavement coating material, further improving the coating's performance. The anti-cracking agent, in combination with sepiolite and tetraquid zinc oxide whiskers, enhances the coating's wear resistance. The anti-cracking agent is a compound of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber. The introduction of fibers facilitates the formation of a three-dimensional randomized support network in the water-based pavement coating material, thereby reducing the coating's shrinkage plasticity. The shrinkage energy of the water-based pavement coating material is dispersed into the fibers, increasing its toughness and reducing cracks. The fiber-supported system facilitates interweaving with sepiolite, thereby improving the uniformity of moisture distribution and reducing cracks caused by settling. The introduction of fibers helps resist crack formation, reducing crack sources and shrinking crack size, resulting in a significant reduction in stress intensity at crack ends and alleviating excessive stress concentration at crack ends. Steel-polypropylene hybrid fibers and silicon carbide fibers have good thermal conductivity, facilitating the formation of thermal conduction pathways with tetra-needle zinc oxide whiskers, thus reducing cracking of the coating due to thermal expansion and contraction. The modified carbon fiber is manufactured in-house. First, a magnesium oxide layer is coated on the outer layer of the carbon fiber. The magnesium oxide coating improves the roughness of the outer layer of the carbon fiber, and the good thermal conductivity of magnesium oxide further enhances the thermal conductivity of the outer layer of the carbon fiber, further improving the thermal conduction pathways in the coating. Subsequently, a repair agent is adhered to the surface of the carbon fiber. The calcium ions in the calcium oxide expansion agent in the repair agent dissolve in water and form calcium carbonate crystals with carbon dioxide in the environment, which helps reduce gaps in the coating and improves the crack resistance of the coating.

[0010] Preferably, the anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of (5-6):(2-3):(3-4).

[0011] By adopting the above technical solution, the anti-cracking agent is obtained by compounding three components: modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber. The ratio of the three components is adjusted to achieve the optimal ratio. The amount of modified carbon fiber added is greater than that of steel-polypropylene hybrid fiber and silicon carbide fiber, which facilitates better performance of the anti-cracking agent and improves the anti-cracking performance of the coating.

[0012] Preferably, the filler is composed of talc powder, boron nitride, and wollastonite powder in a mass ratio of (5-6):(2-3):(2-3).

[0013] By adopting the above technical solution, the filler is obtained by compounding three components: talc powder, boron nitride, and wollastonite powder. The ratio of the three components is adjusted to achieve the optimal ratio. Talc powder is a scaly crystal containing fibrous material, which is lightweight and soft. In water-based pavement overlay materials, it can absorb tensile stress and reduce crack formation. Wollastonite powder is needle-like or fibrous, which is convenient for reinforcement and reduces crack sensitivity. Boron nitride has good thermal conductivity and good wear resistance, which is convenient for combination with tetra-needle zinc oxide whiskers and anti-cracking agents in the overlay material to improve the crack resistance of the overlay material.

[0014] Preferably, the steel-polypropylene hybrid fiber is composed of steel fiber and polypropylene fiber in a mass ratio of (5-6):(1-2).

[0015] By adopting the above technical solution, the mass ratio of steel fiber and polypropylene fiber in the steel-polypropylene hybrid fiber is adjusted to achieve the optimal ratio of the two components. The steel fiber has good thermal conductivity, which facilitates better mixing with silicon carbide fiber and reduces the heat accumulated in the coating during the drying process. Under reasonable ratio, the high elastic modulus steel fiber and the low elastic modulus polypropylene fiber are mixed and incorporated into the water-based pavement coating material, so that the water-based pavement coating material combines the advantages of the two fibers and has better toughness.

[0016] Preferably, in step S2, the mass ratio of carbon fiber 1 to magnesium nitrate solution is (1-2):(3-4).

[0017] By adopting the above technical solution, the mass of the two components, carbon fiber and magnesium nitrate solution, is adjusted to achieve the optimal ratio of the two components. This facilitates control of the magnesium oxide content on the carbon fiber surface, increases the surface roughness of the carbon fiber, and facilitates better adhesion of the repair agent, thus enabling the repair agent to play its role in water-based pavement coating materials.

[0018] Preferably, the immersion time in step S4 is 15-20 minutes.

[0019] By adopting the above technical solution and adjusting the impregnation time, it is easier to control the content of acrylic emulsion on the carbon fiber surface, which facilitates better adhesion of the repair agent.

[0020] Preferably, in step S5, the mass ratio of carbon fiber to repair agent is (2-3):(1-2).

[0021] By adopting the above technical solution, the mass ratio of carbon fiber and repair agent can be adjusted, which makes it easier to control the amount of repair agent coating on the surface of carbon fiber and better exert the role of repair agent in water-based pavement coating materials, thereby improving the crack resistance of water-based pavement coating materials.

[0022] Preferably, the defoamer is composed of polyether-modified organosilicon and polysiloxane in a mass ratio of (3-5):(1-2).

[0023] By adopting the above technical solution, the defoamer is obtained by compounding two components: polyether-modified organosilicon and polysiloxane. The ratio of the two components is adjusted to achieve the optimal ratio, which facilitates better defoaming effect in the coating material, reduces the amount of foam in the coating material, and improves the performance of the coating material.

[0024] Preferably, the dispersant is composed of sodium polyacrylate and sodium polymethacrylate in a mass ratio of (4-5):(2-3).

[0025] By adopting the above technical solution, the addition of dispersant facilitates the effective dispersion of inorganic pigments and fillers, and adsorption on the surface of pigments and fillers, thereby modifying the surface of hydrophilic pigments and fillers to be hydrophobic. At the same time, it has good compatibility with polymer resin. The two components, sodium polyacrylate and sodium polymethacrylate, work together to facilitate the combination with adhesion promoters, crack-resistant agents and other raw materials in the coating material, thereby improving the performance of the coating material.

[0026] Secondly, this application provides a method for preparing a water-based pavement overlay material, employing the following technical solution:

[0027] A method for preparing a water-based pavement overlay material includes the following steps:

[0028] (1) Mix the anti-cracking agent, cis-butadiene rubber, sepiolite, tetrane needle-shaped zinc oxide whiskers, waterborne epoxy resin, and 1 / 3-1 / 2 water to obtain a premix;

[0029] (2) The premix obtained in step (1) is mixed with cellulose nanocrystals, defoamer, dispersant, pigment, filler, curing agent, adhesion promoter, leveling agent and remaining water to obtain the final product.

[0030] By adopting the above technical solution, the preparation method of water-based pavement coating material is simple, and the resulting water-based pavement coating material has good crack resistance, good adhesion, and good storage stability.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. The pigments, fillers, anti-cracking agents, sepiolite, and tetraneedle zinc oxide whiskers in the water-based pavement coating material of this application are combined with each other and dispersed in water-based epoxy resin under the action of dispersants and other raw materials. When coated on the pavement, the resulting coating has good wear resistance and anti-cracking properties. The addition of adhesion promoters facilitates the combination with other components of the water-based pavement coating material, which further improves the performance of the water-based pavement coating material. The anti-cracking agent, combined with sepiolite and tetraneedle zinc oxide whiskers, facilitates the improvement of the wear resistance of the water-based pavement coating material.

[0033] 2. The anti-cracking agent in the water-based pavement coating material of this application is a compound of three components: modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber. The introduction of fibers facilitates the formation of a three-dimensional randomized support network in the water-based pavement coating material, thereby reducing the shrinkage plasticity of the water-based pavement coating material. The shrinkage energy of the water-based pavement coating material is dispersed into the fibers in the water-based pavement coating material, thereby increasing the toughness of the water-based pavement coating material and reducing the occurrence of cracks in the coating. At the same time, the support system formed by the fibers facilitates interweaving with sepiolite, thereby improving the uniformity of moisture distribution and reducing cracks caused by settlement. The introduction of fibers helps resist the occurrence of cracks, thereby reducing crack sources and reducing crack size, resulting in a significant reduction in stress intensity at the crack ends and alleviating the situation of excessive stress concentration at the crack ends. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] To facilitate understanding of this application, a more complete description will be provided below. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0038] Preparation example of modified carbon fiber

[0039] Preparation Example 1

[0040] The method for preparing the modified carbon fiber in this preparation example includes the following steps:

[0041] S1. After washing the carbon fiber with distilled water, use acetone to remove oil and dehydrate it. Then place it in a heating furnace and heat it to 900℃ under nitrogen protection at a heating rate of 15℃ / min. Introduce mixed gas, keep it at this temperature for 20min, and cool it to room temperature to obtain carbon fiber one. The cooling rate is 10℃ / min.

[0042] S2. Carbon fiber I and magnesium nitrate solution are mixed to obtain a mixed solution. The pH is adjusted to 9 using sodium hydroxide solution, and the reaction is carried out for 2 hours. The mixture is then washed with distilled water and dried in a vacuum drying oven at 80℃. The dried carbon fiber I is placed in a heating furnace under nitrogen protection and heated to 350℃, held at that temperature for 5 hours, and then cooled to room temperature to obtain carbon fiber II. The heating rate is 10℃ / min, and the cooling rate is 15℃ / min. The molar concentration of magnesium nitrate solution is 1 mol / L, and the molar concentration of sodium hydroxide solution is 1 mol / L. The mass ratio of carbon fiber I to magnesium nitrate solution is 1:3.

[0043] S3. Calcium oxide expanding agent, calcium sulfoaluminate expanding agent, and sodium silicate are ball-milled and mixed at a mass ratio of 1:1:1 to obtain a mixture. The mixture is then ball-milled and mixed with sepiolite to obtain a repair agent. The mass ratio of calcium oxide expanding agent to sepiolite is 1:0.5. The sodium silicate is manufactured by Tianjin Yongda Chemical Reagent Co., Ltd.; the sepiolite is manufactured by Hebei Hongli Sepiolite Wool Co., Ltd.; the calcium sulfoaluminate expanding agent and the calcium oxide expanding agent are commercially available.

[0044] S4. Impregnate carbon fiber II in acrylic emulsion to obtain carbon fiber III; the impregnation time is 15 min; the acrylic emulsion is styrene-acrylic emulsion, and the manufacturer of styrene-acrylic emulsion is Zhengzhou Lishengyuan Chemical Products Co., Ltd.

[0045] S5. Mix carbon fiber III and the repair agent, and dry to obtain the final product. The mass ratio of carbon fiber III to the repair agent is 2:1.

[0046] Preparation Example 2

[0047] The method for preparing the modified carbon fiber in this preparation example includes the following steps:

[0048] S1. After washing the carbon fiber with distilled water, use acetone to remove oil and dehydrate it. Then place it in a heating furnace and heat it to 900℃ under nitrogen protection at a heating rate of 15℃ / min. Introduce mixed gas, keep it at this temperature for 20min, and cool it to room temperature to obtain carbon fiber one. The cooling rate is 10℃ / min.

[0049] S2. Carbon fiber I and magnesium nitrate solution are mixed to obtain a mixed solution. The pH is adjusted to 9 using sodium hydroxide solution, and the reaction is carried out for 2 hours. The mixture is then washed with distilled water and dried in a vacuum drying oven at 80℃. The dried carbon fiber I is placed in a heating furnace under nitrogen protection and heated to 350℃, held at that temperature for 5 hours, and then cooled to room temperature to obtain carbon fiber II. The heating rate is 10℃ / min, and the cooling rate is 15℃ / min. The molar concentration of magnesium nitrate solution is 1 mol / L, and the molar concentration of sodium hydroxide solution is 1 mol / L. The mass ratio of carbon fiber I to magnesium nitrate solution is 2:4.

[0050] S3. Calcium oxide expanding agent, calcium sulfoaluminate expanding agent, and sodium silicate are ball-milled and mixed at a mass ratio of 1:1:1 to obtain a mixture. The mixture is then ball-milled and mixed with sepiolite to obtain a repair agent. The mass ratio of calcium oxide expanding agent to sepiolite is 1:0.5. The sodium silicate is manufactured by Tianjin Yongda Chemical Reagent Co., Ltd.; the sepiolite is manufactured by Hebei Hongli Sepiolite Wool Co., Ltd.; the calcium sulfoaluminate expanding agent and the calcium oxide expanding agent are commercially available.

[0051] S4. Impregnate carbon fiber II in acrylic emulsion to obtain carbon fiber III; the impregnation time is 20 min; the acrylic emulsion is styrene-acrylic emulsion, and the manufacturer of styrene-acrylic emulsion is Zhengzhou Lishengyuan Chemical Products Co., Ltd.

[0052] S5. Mix carbon fiber III and the repair agent, and dry to obtain the final product. The mass ratio of carbon fiber III to the repair agent is 3:2.

[0053] Preparation Example 3

[0054] The method for preparing the modified carbon fiber in this preparation example includes the following steps:

[0055] S1. After washing the carbon fiber with distilled water, use acetone to remove oil and dehydrate it. Then place it in a heating furnace and heat it to 900℃ under nitrogen protection at a heating rate of 15℃ / min. Introduce mixed gas, keep it at this temperature for 20min, and cool it to room temperature to obtain carbon fiber one. The cooling rate is 10℃ / min.

[0056] S2. Mix carbon fiber I and magnesium nitrate solution to obtain a mixed solution. Adjust the pH to 9 with sodium hydroxide solution and react for 2 hours. Wash with distilled water and then dry in an 80℃ vacuum drying oven. Place the dried carbon fiber I in a heating furnace, protect with nitrogen, heat to 350℃, hold for 5 hours, and cool to room temperature to obtain the final product. The heating rate is 10℃ / min, and the cooling rate is 15℃ / min. The molar concentration of magnesium nitrate solution is 1 mol / L, and the molar concentration of sodium hydroxide solution is 1 mol / L. The mass ratio of carbon fiber I to magnesium nitrate solution is 1:3.

[0057] Preparation Example 4

[0058] The method for preparing the modified carbon fiber in this preparation example includes the following steps:

[0059] S1. After washing the carbon fiber with distilled water, use acetone to remove oil and dehydrate it. Then place it in a heating furnace and heat it to 900℃ under nitrogen protection at a heating rate of 15℃ / min. Introduce mixed gas, keep it at this temperature for 20min, and cool it to room temperature to obtain carbon fiber one. The cooling rate is 10℃ / min.

[0060] S2. Carbon fiber I and magnesium nitrate solution are mixed to obtain a mixed solution. The pH is adjusted to 9 using sodium hydroxide solution, and the reaction is carried out for 2 hours. The mixture is then washed with distilled water and dried in a vacuum drying oven at 80℃. The dried carbon fiber I is placed in a heating furnace under nitrogen protection and heated to 350℃, held at that temperature for 5 hours, and then cooled to room temperature to obtain carbon fiber II. The heating rate is 10℃ / min, and the cooling rate is 15℃ / min. The molar concentration of magnesium nitrate solution is 1 mol / L, and the molar concentration of sodium hydroxide solution is 1 mol / L. The mass ratio of carbon fiber I to magnesium nitrate solution is 1:3.

[0061] S3. Ball mill and mix calcium oxide expanding agent, calcium sulfoaluminate expanding agent and sodium silicate in a mass ratio of 1:1:1 to obtain the repair agent; the manufacturer of sodium silicate is Tianjin Yongda Chemical Reagent Co., Ltd.; calcium sulfoaluminate expanding agent is commercially available; calcium oxide expanding agent is commercially available.

[0062] S4. Impregnate carbon fiber II in acrylic emulsion to obtain carbon fiber III; the impregnation time is 15 min; the acrylic emulsion is styrene-acrylic emulsion, and the manufacturer of styrene-acrylic emulsion is Zhengzhou Lishengyuan Chemical Products Co., Ltd.

[0063] S5. Mix carbon fiber III and the repair agent, and dry to obtain the final product. The mass ratio of carbon fiber III to the repair agent is 2:1.

[0064] Example

[0065] Example 1

[0066] The water-based road surface coating material of this embodiment includes the following raw materials by weight: 20 kg water, 1 kg cellulose nanocrystals, 1 kg sepiolite, 3 kg anti-cracking agent, 3 kg butadiene rubber, 1 kg defoamer, 1 kg leveling agent, 1 kg dispersant, 5 kg pigment, 20 kg filler, 50 kg curing agent, 3 kg tetraneedle zinc oxide whiskers, 100 kg water-based epoxy resin, and 1 kg adhesion promoter. The anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of 1:1:1; the steel-polypropylene hybrid fiber is composed of steel fiber and polypropylene fiber in a mass ratio of 5:1; the modified carbon fiber was prepared in Preparation Example 1; the cellulose nanocrystals are manufactured by Zhejiang Jinjiahao Green Nanomaterials; the sepiolite is manufactured by Hebei Hongli Sepiolite Fiber Co., Ltd.; the pigment is titanium dioxide with a particle size of 5μm; the butadiene rubber has a particle size of 10μm; the defoamer is composed of polyether-modified organosilicon and polysiloxane in a mass ratio of 3:1; the polysiloxane is manufactured by Dongguan Bainian Hongtu Chemical Technology Co., Ltd., and the polyether-modified organosilicon is manufactured by Hubei Longsheng Sihai New Materials Co., Ltd.; the leveling agent is polyether-modified polydidicarbonate. The methylsiloxane is manufactured by Guangdong Nuoyi Chemical Co., Ltd.; the dispersant is composed of sodium polyacrylate and sodium polymethacrylate in a mass ratio of 4:2, with the sodium polymethacrylate having a weight-average molecular weight of 2000 and the sodium polyacrylate having a weight-average molecular weight of 1500; the filler is composed of talc powder, boron nitride, and wollastonite powder in a mass ratio of 5:2:2; the curing agent is isophorone diamine, manufactured by Hubei Kewode Chemical Co., Ltd.; the tetraneedle-shaped zinc oxide whiskers are manufactured by Hangzhou Jikang New Materials Co., Ltd.; the waterborne epoxy resin is bisphenol A type epoxy resin, manufactured by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the adhesion promoter is propyltrimethoxysilane, manufactured by Guangzhou Nantai Chemical Co., Ltd.

[0067] The method for preparing the water-based pavement overlay material in this embodiment includes the following steps:

[0068] (1) Mix the anti-cracking agent, butadiene rubber, sepiolite, tetrane needle-shaped zinc oxide whiskers, waterborne epoxy resin and 1 / 3 water to obtain a premix;

[0069] (2) The premix obtained in step (1) is mixed with cellulose nanocrystals, defoamer, dispersant, pigment, filler, curing agent, adhesion promoter, leveling agent and remaining water to obtain the final product.

[0070] Example 2

[0071] The water-based pavement coating material of this embodiment differs from that of Example 1 in that it includes the following raw materials by weight: 30 kg water, 2 kg cellulose nanocrystals, 2 kg sepiolite, 5 kg anti-cracking agent, 5 kg butadiene rubber, 2 kg defoamer, 2 kg leveling agent, 1 kg dispersant, 10 kg pigment, 25 kg filler, 55 kg curing agent, 5 kg tetraneedle-shaped zinc oxide whiskers, 110 kg water-based epoxy resin, and 2 kg adhesion promoter. The filler is composed of talc powder, boron nitride, and wollastonite powder in a mass ratio of 6:3:3; the steel-polypropylene hybrid fiber is composed of steel fiber and polypropylene fiber in a mass ratio of 6:2; the defoamer is composed of polyether-modified organosilicon and polysiloxane in a mass ratio of 5:2; the dispersant is composed of sodium polyacrylate and sodium polymethacrylate in a mass ratio of 5:3; and the modified carbon fiber was prepared in Preparation Example 2.

[0072] The method for preparing the water-based pavement overlay material in this embodiment includes the following steps:

[0073] (1) Mix the anti-cracking agent, cis-butadiene rubber, sepiolite, tetrane needle-shaped zinc oxide whiskers, waterborne epoxy resin, and 1 / 2 water to obtain a premix;

[0074] (2) The premix obtained in step (1) is mixed with cellulose nanocrystals, defoamer, dispersant, pigment, filler, curing agent, adhesion promoter, leveling agent and remaining water to obtain the final product.

[0075] Example 3

[0076] The difference between the water-based pavement coating material in this embodiment and that in Embodiment 2 is that the anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of 5:2:3.

[0077] Example 4

[0078] The difference between the water-based pavement coating material in this embodiment and that in Embodiment 2 is that the anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of 6:3:4.

[0079] Comparative Example

[0080] Comparative Example 1

[0081] The water-based pavement coating material in this comparative example differs from that in Example 1 in that no anti-cracking agent is added.

[0082] Comparative Example 2

[0083] The difference between the water-based pavement coating material in this comparative example and that in Example 1 is that the anti-cracking agent is composed of carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of 1:1:1.

[0084] Comparative Example 3

[0085] The difference between the water-based pavement coating material in this comparative example and that in Example 1 is that the crack-resistant agent is modified carbon fiber.

[0086] Comparative Example 4

[0087] The difference between the water-based pavement coating material in this comparative example and that in Example 1 is that the anti-cracking agent is composed of steel-polypropylene hybrid fibers and silicon carbide fibers in a mass ratio of 1:1.

[0088] Comparative Example 5

[0089] The difference between the water-based pavement coating material in this comparative example and Example 1 is that the modified carbon fiber was prepared in Example 3.

[0090] Comparative Example 6

[0091] The difference between the water-based pavement coating material in this comparative example and Example 1 is that the modified carbon fiber was prepared in Example 4.

[0092] Performance testing

[0093] Storage stability test: The water-based pavement coating materials prepared in Examples 1-4 were used to test the storage stability of the coating materials according to the test methods in GB / T 6753.3-1986 "Test Method for Storage Stability of Coatings". The test results are shown in Table 1.

[0094] Adhesion test: The water-based road surface coating materials prepared in Examples 1-4 and Comparative Examples 1-6 were applied to steel plates and dried at room temperature for 30 minutes. The adhesion of the coating materials was tested according to the test method in GB / T 9286-1998 "Cross-cut test of paint and varnish film". The test results are shown in Table 1.

[0095] Cracking resistance test: The water-based road surface coating materials prepared in Examples 1-4 and Comparative Examples 1-6 were applied to steel plates. After 24 hours of application, the surface condition of the coating was observed and the coating thickness was recorded. The test results are shown in Table 1.

[0096] Table 1. Performance test results of water-based pavement overlay materials in Examples 1-4 and Comparative Examples 1-6

[0097]

[0098] As can be seen from the data in Table 1, the water-based pavement coating materials prepared in Examples 1-4 have better adhesion, better storage stability, and better crack resistance.

[0099] This specific embodiment is merely an explanation of this application and is not intended to limit it. Those skilled in the art can make modifications to this embodiment without contributing any inventive step after reading this specification.

Claims

1. A water-based pavement coating material, characterized in that, It is mainly made of the following raw materials in parts by weight: 20-30 parts water, 1-2 parts cellulose nanocrystals, 1-2 parts sepiolite, 3-5 parts anti-cracking agent, 3-5 parts butadiene rubber, 1-2 parts defoamer, 1-2 parts leveling agent, 1-2 parts dispersant, 5-10 parts pigment, 20-25 parts filler, 50-55 parts curing agent, 3-5 parts tetraneedle-shaped zinc oxide whiskers, 100-110 parts waterborne epoxy resin, and 1-2 parts adhesion promoter. The anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of (5-6):(2-3):(3-4) or the anti-cracking agent is composed of modified carbon fiber, steel-polypropylene hybrid fiber, and silicon carbide fiber in a mass ratio of 1:1:

1. The preparation method of the modified carbon fiber includes the following steps: S1. Calcine carbon fiber by heating and cooling to obtain carbon fiber one; S2. Mix carbon fiber one with magnesium nitrate solution to obtain a mixture, adjust the pH to alkaline, react, wash, dry, heat, and cool to room temperature to obtain carbon fiber two; S3. Ball mill and mix calcium oxide expanding agent, calcium sulfoaluminate expanding agent, and sodium silicate to obtain a mixture, then ball mill and mix the mixture with sepiolite to obtain a repair agent; S4. Impregnate carbon fiber two in acrylic emulsion to obtain carbon fiber three; S5. Mix carbon fiber three with the repair agent and dry to obtain the final product.

2. The water-based pavement overlay material according to claim 1, characterized in that, The filler is composed of talc powder, boron nitride, and wollastonite powder in a mass ratio of (5-6):(2-3):(2-3).

3. The water-based pavement overlay material according to claim 1, characterized in that, The steel-polypropylene hybrid fiber is composed of steel fiber and polypropylene fiber in a mass ratio of (5-6):(1-2).

4. The water-based pavement overlay material according to claim 1, characterized in that, In step S2, the mass ratio of carbon fiber 1 to magnesium nitrate solution is (1-2):(3-4).

5. The water-based pavement overlay material according to claim 1, characterized in that, The soaking time in step S4 is 15-20 minutes.

6. The water-based pavement overlay material according to claim 1, characterized in that, In step S5, the mass ratio of carbon fiber 3 to repair agent is (2-3):(1-2).

7. The water-based pavement coating material and its preparation method according to claim 1, characterized in that, The defoamer is composed of polyether-modified organosilicon and polysiloxane in a mass ratio of (3-5):(1-2).

8. The water-based pavement coating material according to claim 1, characterized in that, The dispersant is composed of sodium polyacrylate and sodium polymethacrylate in a mass ratio of (4-5):(2-3).

9. A method for preparing a water-based pavement overlay material as described in any one of claims 1-8, characterized in that, The steps include: (1) mixing anti-cracking agent, butadiene rubber, sepiolite, tetrane needle-shaped zinc oxide whiskers, waterborne epoxy resin, and 1 / 3-1 / 2 water to obtain a premix; (2) The premix obtained in step (1) is mixed with cellulose nanocrystals, defoamer, dispersant, pigment, filler, curing agent, adhesion promoter, leveling agent and remaining water to obtain the final product.

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