Colored asphalt pavement repair coating and preparation process thereof

Abstract

The invention relates to the technical field of asphalt pavement coatings, and particularly discloses a colored asphalt pavement repair coating and a preparation process thereof. The colored asphalt pavement repair coating is prepared from the following raw materials in parts by weight: 10 to 15 parts of colored master batch, 40 to 60 parts of emulsified asphalt, 5 to 10 parts of filler, 30 to 50 parts of acrylate emulsion, 10 to 15 parts of rubber emulsion, 1 to 3 parts of thickening agent and 1 to 3 parts of cross-linking agent, in the raw materials of the colored asphalt pavement repair coating prepared by the application, the acrylate emulsion has better film-forming property and flexibility, the rubber emulsion reduces the brittleness of a coating and improves the elasticity, impact resistance and wear resistance of the repair coating, and the emulsified asphalt has better adhesive property; the acrylate emulsion, the rubber emulsion and other components can be bonded with a pavement base material, and are filled into asphalt pavement cracks or tiny pits and grooves.

Description

Technical Field

[0001] The present application relates to the technical field of asphalt pavement coatings, and in particular to a colored asphalt pavement repair coating and a preparation process thereof. Background Art

[0002] With the continuous development of urban transportation, asphalt pavement is widely used due to its advantages of flatness, wear resistance, and anti-skid. However, after a few years of use, asphalt pavement is prone to fine aggregate shedding, coarse aggregate exposure, and polishing due to factors such as wheel friction, rain and snow erosion, and high temperature melting, which seriously reduces the friction coefficient of the pavement, affects driving safety, and causes serious hazards such as large cracks and collapses.

[0003] The existing method for repairing asphalt pavement mainly involves on-site heating, pouring, and spreading asphalt mixtures on the asphalt pavement. This repair method has the main problems of high construction difficulty and air pollution. At the same time, asphalt thickens and solidifies rapidly after cooling in the air, and cannot penetrate into the fine cracks of the cracks, and cannot play a role in filling and bonding, which ultimately leads to the failure of the repair project. Summary of the invention

[0004] In order to improve the existing asphalt pavement diseases, the present application provides a colored asphalt pavement repair coating and a preparation process thereof. In a first aspect, the present application provides a colored asphalt pavement repair coating, which adopts the following technical solution: A colored asphalt pavement repair coating comprises the following raw materials in parts by weight: 10-15 parts of color masterbatch, 40-60 parts of emulsified asphalt, 30-50 parts of water, 5-10 parts of filler, 30-50 parts of acrylate emulsion, 10-15 parts of rubber emulsion, 1-3 parts of thickener and 1-3 parts of crosslinking agent.

[0005] By adopting the above technical scheme, acrylic emulsion and emulsified asphalt can form a stable dispersion system. Acrylic emulsion has good strength, film-forming property and flexibility. When acrylic emulsion and emulsified asphalt are applied on the asphalt pavement and dry, the water in acrylic emulsion gradually evaporates, and acrylic polymer particles fuse with each other to form a continuous and elastic film, thereby improving the flexibility and crack resistance of the repair coating. Emulsified asphalt has good bonding properties, and can form a strong bond between acrylic emulsion, rubber emulsion and other components and the pavement substrate, and fill them into cracks or tiny pits and grooves in the asphalt pavement. The bonding effect of emulsified asphalt combined with the film-forming effect of acrylic emulsion can promote the repair coating to have stronger adhesion and durability, and reduce the shedding phenomenon of the repair coating. Rubber emulsion can reduce the brittleness of the repair coating, improve the elasticity, impact resistance and wear resistance of the repair coating, and extend the service life of the repair coating.

[0006] Preferably, the filler is at least one of hollow microspheres, quartz sand, and heavy calcium carbonate.

[0007] By adopting the above technical scheme, hollow microspheres, quartz sand and heavy calcium carbonate are added to the raw materials of the repair coating, which can enter the pores and cracks of the asphalt pavement, play a filling role, improve the strength, hardness and wear resistance of the asphalt pavement, reduce the extension of cracks in the asphalt pavement, and make the repair coating less likely to crack under high and low temperature changes and traffic loads.

[0008] Preferably, the rubber latex is chloroprene rubber latex.

[0009] By adopting the above technical solution, the chloroprene rubber emulsion has good elasticity, which can improve the flexibility and crack resistance of the repair coating. Under the influence of high and low temperature changes and traffic loads, the elasticity of the chloroprene rubber emulsion can absorb and disperse stress, reduce the cracking of the coating, and thus extend the service life of the road surface. The chloroprene rubber emulsion can also enhance the adhesion between the coating and the road substrate, so that the repair coating is firmly attached to the road substrate and reduce the shedding of the repair coating.

[0010] Preferably, the solid content of the chloroprene rubber emulsion is 50-60%.

[0011] Preferably, the thickener is one of an alkali swellable thickener, a polyurethane associative thickener and a cellulose thickener.

[0012] By adopting the above technical solution, the alkali-swellable thickener can swell rapidly under alkaline conditions, increase the viscosity of the repair coating, give the repair coating good thixotropy, facilitate coating and scraping, and help the repair coating maintain a good shape after construction and not easily sag and drip. The polyurethane associative thickener and the cellulose thickener can enhance the viscosity of the repair coating, reduce the sedimentation of pigments and fillers, enhance the anti-sagging property of the repair coating, and maintain the uniformity of the repair coating.

[0013] Preferably, the cellulose thickener is one of hydroxypropyl cellulose and hydroxyethyl cellulose.

[0014] Preferably, the cellulose thickener is pre-modified with dodecane bromide, and the modification method comprises the following specific steps: mixing the cellulose thickener with a solvent, alkalizing under the protection of nitrogen, heating to 60-80°C, adding dodecane bromide for reaction, neutralizing, filtering and washing after the reaction to obtain a modified cellulose thickener.

[0015] By adopting the above technical solution, hydrophobic groups are introduced into the molecular weight of hydroxypropyl cellulose and hydroxyethyl cellulose to increase the hydrophobic properties of the cellulose thickener, so that the cellulose thickener can be better compatible with asphalt, and the uniformity and dispersibility of the repair coating can be improved. The enhanced hydrophobicity of hydroxypropyl cellulose and hydroxyethyl cellulose can also maintain the viscosity and stability of the coating in a humid and water-immersed environment, reduce the erosion of the coating by environmental factors such as ultraviolet rays, rain, and salt spray, extend the service life of the coating, reduce the splashing and dripping of the coating during the construction process, and maintain good anti-sagging properties.

[0016] In a second aspect, the present application provides a preparation process of a colored asphalt pavement repair coating, which adopts the following technical solution: A preparation process for a colored asphalt pavement repair coating comprises the following specific steps: mixing a color masterbatch, water, a filler, an acrylate emulsion and a rubber emulsion, and then adding emulsified asphalt, a thickener and a cross-linking agent to form a colored asphalt pavement repair coating.

[0017] By adopting the above technical scheme, the prepared colored asphalt pavement repair coating can be constructed at room temperature, which is convenient and fast, has a long storage time, and can effectively repair the asphalt pavement, reducing the expansion and collapse of asphalt pavement cracks under temperature changes and vehicle loads.

[0018] In summary, this application has the following beneficial effects: 1. Since the present application uses acrylic emulsion and emulsified asphalt, the good film-forming property and flexibility of acrylic, and the adhesive property of emulsified asphalt, can promote the repair coating to be firmly attached to the asphalt pavement substrate and fill the asphalt pavement defects. At the same time, the rubber emulsion is used to reduce the brittleness of the repair coating, improve the elasticity, impact resistance and wear resistance of the repair coating, and extend the service life of the repair coating.

[0019] 2. In this application, alkali swelling thickener, polyurethane associative thickener and cellulose thickener are used to enhance the viscosity of the repair coating, reduce the sedimentation of pigments and fillers, enhance the anti-sagging property of the repair coating, and improve the durability and uniformity of the repair coating. The use of brominated dodecane to modify the cellulose thickener can increase the hydrophobicity of the cellulose thickener, make the thickener more compatible with asphalt, and improve the uniformity and dispersibility of the repair coating. DETAILED DESCRIPTION

[0020] The present application is further described in detail below with reference to the embodiments.

[0021] All raw materials in the examples are commercially available.

[0022] Acrylate emulsion was purchased from Shanghai Baolijia Chemical Co., Ltd. Example

[0023] Example 1 This embodiment provides a colored asphalt pavement repair coating, comprising the following raw materials in parts by weight: 13 kg of color masterbatch, 50 kg of emulsified asphalt, 8 kg of filler, 40 kg of acrylate emulsion, 13 kg of rubber emulsion, 2 kg of thickener, and 2 kg of crosslinking agent. The color masterbatch is a black masterbatch, the filler is quartz sand, the average particle size of the quartz sand is 30-50 μm, the rubber emulsion is a chloroprene rubber emulsion, the solid content of the chloroprene rubber emulsion is 55%, the thickener is a polyurethane associative thickener RM-12w, and the crosslinking agent is a silane coupling agent KH-560.

[0024] The preparation process of the colored asphalt pavement repair coating includes the following specific steps: The color masterbatch, filler, acrylic emulsion and rubber emulsion were mixed, stirred at a speed of 300 r / min for 30 minutes, and then the emulsified asphalt, thickener and cross-linking agent were added and mixed, and stirred at a speed of 500 r / min for 50 minutes to form a colored asphalt pavement repair coating.

[0025] Example 2 The difference between Example 2 and Example 1 is that the amount of color masterbatch used in the raw materials of colored asphalt pavement repair coating is 10 kg, the amount of emulsified asphalt used is 40 kg, the amount of filler used is 5 kg, the amount of acrylic emulsion used is 50 kg, the amount of rubber emulsion used is 10 kg, the amount of thickener used is 1 kg, and the amount of cross-linking agent used is 1 kg.

[0026] Example 3 The difference between Example 3 and Example 1 is that the amount of color masterbatch used in the raw materials of colored asphalt pavement repair coating is 15 kg, the amount of emulsified asphalt used is 60 kg, the amount of filler used is 10 kg, the amount of acrylic emulsion used is 30 kg, the amount of rubber emulsion used is 15 kg, the amount of thickener used is 3 kg, and the amount of cross-linking agent used is 3 kg.

[0027] Example 4 The difference between Example 4 and Example 1 is that the filler in the raw material of the colored asphalt pavement repair coating is a mixture of hollow microspheres and heavy calcium carbonate, the ratio of hollow microspheres to heavy calcium carbonate is 1:1, the hollow microspheres are hollow ceramic microspheres, and the average particle size of the filler is 30-50 μm.

[0028] Example 5 The difference between Example 5 and Example 1 is that the rubber emulsion in the raw material of the colored asphalt pavement repair coating is styrene-butadiene rubber emulsion, and the solid content of the styrene-butadiene rubber emulsion is 70%.

[0029] Example 6 The difference between Example 6 and Example 1 is that the thickener in the raw material of the colored asphalt pavement repair coating is an alkali swelling type thickener, wherein the alkali swelling type thickener is a TT-935 type thickener.

[0030] Example 7 The difference between Example 7 and Example 1 is that the thickener in the raw material of the colored asphalt pavement repair coating is a cellulose thickener, wherein the cellulose thickener is hydroxypropyl cellulose, and the molar substitution degree of hydroxypropyl cellulose is 2.1.

[0031] Example 8 The difference between Example 8 and Example 1 is that the thickener in the raw material of the colored asphalt pavement repair coating is a cellulose thickener, wherein the cellulose thickener is hydroxyethyl cellulose, and the molar substitution degree of the hydroxyethyl cellulose is 1.8.

[0032] Example 9 The difference between Example 9 and Example 8 is that the cellulose thickener in the raw material of the colored asphalt pavement repair coating is pre-modified with brominated dodecane.

[0033] The preparation process of the colored asphalt pavement repair coating includes the following specific steps: S1: Mix hydroxyethyl cellulose and isopropanol in a mass ratio of 1:30 to form a cellulose mixed solution. Under the protection of nitrogen, slowly add sodium hydroxide to alkalize the cellulose mixed solution until the concentration of sodium hydroxide in the cellulose mixed solution reaches 4%. Slowly add dodecane bromide, heat to 70°C for reaction for 2h, and then use glacial acetic acid to neutralize the cellulose mixed solution until the pH value is neutral. After suction filtration, wash and dry to obtain a modified cellulose thickener.

[0034] S2: Mix the color masterbatch, filler, acrylic emulsion and rubber emulsion, stir at 300 r / min for 30 minutes, then add emulsified asphalt, modified cellulose thickener and cross-linking agent, mix and stir at 500 r / min for 50 minutes to form a colored asphalt pavement repair coating.

[0035] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that no acrylic emulsion is used in the raw materials of the colored asphalt pavement repair coating.

[0036] Comparative Example 2 The difference between Comparative Example 1 and Example 1 is that no acrylic emulsion and rubber emulsion are used in the raw materials of the colored asphalt pavement repair coating.

[0037] The preparation process of the colored asphalt pavement repair coating includes the following specific steps: The color masterbatch, filler, emulsified asphalt, thickener and cross-linking agent are mixed and stirred at a speed of 500 r / min for 50 minutes to form a colored asphalt pavement repair coating.

[0038] Performance testing According to the colored asphalt pavement repair coatings provided in Examples 1-9 and Comparative Examples 1-2 of the present application, the following performance tests were performed, and the specific test results are shown in Table 1.

[0039] Detection Methods 1. Bond Strength With reference to the standard of GBT16777-2008 "Test methods for building waterproof coatings", the bonding performance of the colored asphalt pavement repair coating prepared in this application was tested.

[0040] 2. Mechanical properties With reference to the standard of JC / T975-2005 "Waterproof Coatings for Roads and Bridges", the tensile strength, low temperature flexibility and elongation at break of the colored asphalt pavement repair coating prepared in this application were tested.

[0041] Table 1: Performance test results data table It can be seen from the performance test results that the colored asphalt pavement repair coating prepared in the present application has good bonding strength, tensile strength and toughness, can adapt to low temperature environments, and reduce the cracking phenomenon of the repair coating at low temperatures.

[0042] By comparing Example 5 with Example 1, it can be seen that Example 5 uses other types of rubber emulsions, and from the performance test results, it can be seen that the comprehensive performance of the colored asphalt pavement repair coating prepared in Example 1 is better. It is further proved that the chloroprene rubber emulsion has better elasticity and flexibility, can reduce the cracking of the repair coating, and under the action of high and low temperature changes and traffic loads, the elasticity of the chloroprene rubber emulsion can absorb and disperse stress, reduce the cracking of the coating, and thus extend the service life of the road surface.

[0043] By comparing Examples 6-8 with Example 1, it can be seen that the types of thickeners in the raw materials of the colored asphalt pavement repair coatings are different. From the performance test results, it can be seen that the prepared repair coatings have good comprehensive performance.

[0044] In Example 9, the cellulose thickener in the raw material of the colored asphalt pavement repair coating is pre-modified with dodecane bromide. From the performance test results, it can be seen that the introduction of hydrophobic groups into the cellulose thickener increases the hydrophobic properties of the cellulose thickener, improves the uniformity and dispersibility of the repair coating, maintains the viscosity and stability of the coating in a humid and water-immersed environment, reduces the erosion of the coating by environmental factors such as ultraviolet rays, rain, and salt spray, and increases the service life of the repair coating.

[0045] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A colored asphalt pavement repair coating, characterized in that: The invention comprises the following raw materials in parts by weight: 10-15 parts of color masterbatch, 40-60 parts of emulsified asphalt, 5-10 parts of filler, 30-50 parts of acrylic emulsion, 10-15 parts of rubber emulsion, 1-3 parts of thickener and 1-3 parts of crosslinking agent.

2. The colored asphalt pavement repair coating according to claim 1, characterized in that: The filler is at least one of hollow microspheres, quartz sand and heavy calcium carbonate.

3. The colored asphalt pavement repair coating according to claim 1, characterized in that: The rubber latex is chloroprene rubber latex.

4. The colored asphalt pavement repair coating according to claim 3, characterized in that: The chloroprene rubber emulsion has a solid content of 50-60%.

5. The colored asphalt pavement repair coating according to claim 1, characterized in that: The thickener is one of an alkali swelling thickener, a polyurethane associative thickener and a cellulose thickener.

6. The colored asphalt pavement repair coating according to claim 5, characterized in that: The cellulose thickener is one of hydroxypropyl cellulose and hydroxyethyl cellulose.

7. The colored asphalt pavement repair coating according to claim 6, characterized in that: The cellulose thickener is pre-modified with dodecane bromide. The modification method comprises the following specific steps: mixing the cellulose thickener with a solvent, alkalizing under the protection of nitrogen, heating to 60-80° C., adding dodecane bromide for reaction, neutralizing, filtering and washing after the reaction to obtain the modified cellulose thickener.

8. A process for preparing the colored asphalt pavement repair coating according to any one of claims 1 to 7, characterized in that: The method comprises the following specific steps: mixing color masterbatch, filler, acrylic emulsion and rubber emulsion, and then adding emulsified asphalt, thickener and cross-linking agent to form a color asphalt pavement repair coating.

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