A coating composition for reticle surface treatment and a method of preparing the same

Abstract

The present application provides a paint composition for a retroreflective marking surface treatment, comprising, by mass parts: 15-50 parts of a binding material; 0.5-40 parts of a hydrophobic agent; 1-8 parts of an auxiliary agent; 10-35 parts of a cosolvent; 10-45 parts of water; wherein the binding material comprises a polymer resin and an inorganic binding material, and the mass ratio of the solid content of the polymer resin to the inorganic binding material is 1:2-1:15. The present application also provides a retroreflective road marking coated with the above-mentioned paint composition. The road marking has high all-weather dry / wet-state high retroreflective coefficient and high near-infrared light retroreflective performance, and is particularly suitable for machine vision recognition and laser radar recognition technology of the road marking in special weather scenarios such as rainy days and rainy nights. In addition, the road marking surface coated with the paint composition has easy cleaning and sewage resistance performance at the same time.

Description

Technical Field

[0001] This invention relates to the technical field of coating compositions for smart road markings and coatings that can be sensed and identified by autonomous vehicles and vehicle-to-infrastructure (V2I) sensors.

[0002] Specifically, this invention relates to a coating composition applied to the surface of reflective road markings, and a method for preparing the same, which can improve the retroreflective brightness coefficient and near-infrared retroreflective performance of reflective road markings under rainfall conditions. Simultaneously, this coating composition can also improve the ease of cleaning and resistance to sewage on road markings.

[0003] The present invention also relates to a method of using the above-mentioned coating composition and the resulting all-weather reflective road markings. Background Technology

[0004] In 2019, my country's total highway network mileage exceeded 5 million kilometers, with expressways approaching 150,000 kilometers. Meanwhile, the number of civilian vehicles surpassed 250 million. China has become a major highway nation and a major automobile nation, and as a result, issues related to road infrastructure and traffic safety have become increasingly prominent, prompting the government to place greater emphasis on relevant policies and regulations. Road markings, as important traffic guidance and safety facilities, play a crucial role in ensuring safe driving and efficient travel.

[0005] The Ministry of Transport has set strict requirements for the quality and performance of paints used for road markings.

[0006] According to the national standard "Quality Requirements and Test Methods for Road Markings GB / T16311-2009", during normal use, the retroreflective luminance coefficient of reflective white road markings should meet the nighttime visibility requirements (≥80mcd / lx / m). 2 The initial retroreflective luminance coefficient of the newly marked line (white) should be ≥150 mcd / lx / m. 2 Road markings should maintain good visibility even when wet (≥80 mcd / lx / m). 2 ).

[0007] Southern my country experiences heavy rainfall, with the plum rain season lasting for months in many areas each year. Wet roads and waterlogging are common occurrences, and the reflectivity of road markings in rainy nights directly impacts driving safety. Reflective road markings designed for rainy nights are products developed to address the problem of ordinary road markings experiencing a sharp decrease in retroreflective brightness when wet or covered.

[0008] In existing technologies, these products are mainly implemented using two technical solutions: one is to introduce raised sections into the design of ordinary road markings to ensure that some markings are not submerged in water, thus maintaining reflectivity even in rainy weather. The other is mainly based on 3M's rain-reflective reflector (ceramic microsphere) technology, which increases the particle size to expose the reflectors above the water surface, thereby maintaining the retroreflective brightness coefficient. With the former, under special conditions such as high temperatures, there is a risk of tire blowout if a vehicle travels at high speed over the raised sections. With the latter, while it performs well in terms of brightness and visibility, its cost is high; furthermore, the impact and friction from vehicle tires cause significant wear to the large reflectors, resulting in a noticeable decrease in the brightness of the road markings over a short period.

[0009] Furthermore, the rapid development of artificial intelligence and 5G communication technologies makes autonomous vehicles a promising new mode of transportation in the future. Autonomous vehicles use multiple sensors to perceive environmental information, which is then analyzed and calculated by a recognition system before being transmitted to a decision-making system to control the vehicle's operation. Based on the degree of automation, autonomous vehicles can be divided into five levels, with L1-L3 also known as Advanced Driver Assistance Systems (ADAS), and L4 and L5 being fully autonomous driving. LiDAR sensors entered the field of autonomous vehicle sensors relatively late compared to cameras, ultrasonic radar, and millimeter-wave radar, but in L3 and higher-level autonomous vehicles, multi-sensor data fusion schemes using LiDAR are prevalent. The recognition principle of LiDAR is similar to radar; it uses a laser to emit a specific wavelength of light, which reflects off the surface of objects in the environment and returns to the receiver. The receiver then calculates the time to determine the distance to the object and other information, forming a point cloud map. Since LiDAR uses near-infrared light, improving the reflectivity of road markings to near-infrared light can help LiDAR better identify road markings. Summary of the Invention

[0010] The purpose of this invention is to provide a coating composition for marking surface treatment that overcomes the defects of the prior art and a method for preparing the same.

[0011] Another object of the present invention is to provide a method of using the above-described coating composition for road marking surface treatment and the resulting road reflective markings.

[0012] According to a first aspect of the invention, a coating composition for marking surface treatment is provided. Further, the coating composition comprises, by weight parts:

[0013]

[0014]

[0015] The binder includes a polymer resin and an inorganic binder, wherein the mass ratio of the solids in the polymer resin to the inorganic binder is 1:2 to 1:15.

[0016] In this invention, the main function of the adhesive is to provide basic protective functions for the coating and to fully bond various functional components. The hardness, weather resistance, abrasion resistance, and water resistance of the adhesive directly affect the abrasion resistance, weather resistance, and dry (and wet) retroreflective brightness coefficient of the coated markings.

[0017] Furthermore, the polymer resin is selected from one or a combination of several of anionic surfactant-stabilized styrene-acrylic emulsion polymers or pure acrylate emulsion polymers. The polymer emulsion has a conventional particle morphology, a self-crosslinking type, or a core-shell structure.

[0018] Further, the inorganic binder is selected from alkali metal silicates, silica sols, or a combination of both. Preferably, the alkali metal silicate is potassium silicate, and the silica sol is an organically modified silica sol.

[0019] Furthermore, in the coating composition, the binder of the present invention is selected from polymer resin emulsion and inorganic binder in a mass ratio of 1:3 to 1:15.

[0020] Among them, polymer resin emulsion can increase the flexibility of the coating, while inorganic binders such as silicate and silica sol can give the treated marking surface better durability and ensure the excellent retroreflective performance of the marking.

[0021] Furthermore, in the coating composition, the content of the binder is 15-25%.

[0022] Furthermore, the hydrophobic agent is selected from one or more of the following: fluorosilanes, polysilazanes, paraffin emulsions, organosiloxane polymers, polytetrafluoroethylene (PTFE) wax powder, polyethylene (PE) wax powder, silane coupling agents, and polypropylene (PP) wax powder dispersions.

[0023] Preferably, the hydrophobic agent is selected from fluorosilanes, which are present in the coating composition at 0.5-5 parts by weight. Fluorosilanes have excellent weather resistance and stability, enabling the treated reflective surface to have good hydrophobic properties.

[0024] Further, the co-solvent is selected from ethanol and / or isopropanol. Preferably, the co-solvent is 25-35 parts ethanol. Ethanol can promote drying speed and also has low-temperature antifreeze function.

[0025] Furthermore, the additives include one or more of stabilizers, defoamers, film-forming aids, and rheology modifiers. Stabilizers can improve the storage stability of the coating; defoamers can prevent the formation of bubbles in the coating; film-forming aids can promote the plastic flow and elastic deformation of polymers in the latex and improve coalescence properties; rheology modifiers can improve viscosity and application performance.

[0026] Preferably, the additive comprises, by weight, the following:

[0027]

[0028] The stabilizer is exemplarily selected from... CS2, etc.; the defoamer may be, for example, BYK024, etc.; the film-forming aid may be, for example, Texanol, etc.; the rheology modifier may be, for example, ACRYSOL. TM RM-12W, ACRYSOL TM RM-8W, etc.

[0029] According to a second aspect of the present invention, a method for preparing the above-described coating composition for marking surface treatment is provided. The preparation method includes the following steps:

[0030] (1) Add the binder, stabilizer, defoamer, hydrophobic agent and cosolvent to the reaction vessel in sequence and stir to disperse evenly; the stirring speed is 800-1000 rpm.

[0031] (2) Add the mixture of rheology modifier and water to the mixture obtained in step (1) above, and continue to disperse it at high speed until uniform, thus obtaining the coating composition.

[0032] Preferably, the preparation method further includes adding a film-forming aid to the mixture obtained in step (1) before step (2) and increasing the rotation speed.

[0033] According to a third aspect of the present invention, a method of using the above-described coating composition for marking surface treatment is provided, comprising:

[0034] Apply a layer of the above-mentioned paint composition with a dry film thickness of 5μm-20μm to the surface-dried or fully dried reflective road markings, and allow it to dry completely to form a coating.

[0035] According to a fourth aspect of the invention, a road marking is provided, which is coated with the paint composition described above. The dry film thickness of the coating is 5 μm to 20 μm.

[0036] The road markings have high retroreflectivity in both dry and wet conditions and high near-infrared retroreflectivity, with the retroreflectivity ranging from 400-1200 mcd / lx / m. 2 The near-infrared spectral range is from 0.8 to 17 μm (NIR wavelength range). Furthermore, the retroreflectance coefficient of the road markings in a wet state is approximately 100-300 mcd / lx / m higher than that in a dry state. 2 The near-infrared retroreflectivity of a wet state is about 10-40% higher than that of a dry state.

[0037] In addition, the road markings have good cleaning and sewage resistance properties.

[0038] 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 invention pertains.

[0039] The main advantages of this invention are:

[0040] Applying a very thin layer of the surface treatment coating described above to the surface of ordinary reflective road markings can effectively reduce the tendency of the reflective surface of the road markings to be wetted by water or covered by a water film, so that the refractive index at the interface between the reflective surface and the air is kept at a high level.

[0041] At the same time, after treatment, rainwater can be made to form water droplets on the surface of the road markings, so that the retroreflective and near-infrared reflective properties of the road markings are higher under humid and rainy conditions than in dry conditions. Therefore, compared with untreated road markings, their brightness is increased rather than decreased.

[0042] In addition, the binder in the coating composition has good hardness, wear resistance, weather resistance and stability, which can play a good protective role for the original marking surface and the reflective material on the surface, making the reflective performance of the reflective marking more stable and durable. This ensures that the sensors of drivers or autonomous vehicles can still identify the treated markings well in special environments such as rainy nights.

[0043] In summary, the coating for road marking surface treatment provided by this invention can significantly improve the retroreflective brightness and near-infrared reflective performance of reflective road markings in humid and rainy environments. Furthermore, the coating composition of this invention has construction properties such as safety, ease of operation, low toxicity, environmental friendliness, and rapid drying.

[0044] The reflective road markings obtained through the processing of this invention are more easily detected and recognized by drivers or autonomous vehicle recognition systems in special weather scenarios such as rainy nights. At the same time, their excellent wear resistance, weather resistance, rain resistance, acid and alkali resistance and other properties can ensure that the visibility function of the markings can be maintained stably for a long time, thereby improving the road safety guarantee function. Attached Figure Description

[0045] Figure 1 The image shows road markings treated with the paint composition of the present invention;

[0046] Figure 2 The surface modification effect of road markings treated with the coating composition of the present invention is shown;

[0047] Figure 3 The water-resistant properties of road markings treated with the coating composition of the present invention are demonstrated. Detailed Implementation

[0048] The present invention is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise stated, percentages and parts are weight percentages and parts by weight. Unless otherwise specified, the experimental materials and reagents used in the following embodiments are commercially available.

[0049] Example 1: Paint composition 1 for road marking surface treatment and reflective road marking 1

[0050] A coating composition for marking surface treatment, comprising, by weight:

[0051] 10 parts of pure acrylic emulsion polymer emulsion (50% solid content);

[0052] Potassium silicate solution (solid content approximately 30%) 20 parts;

[0053] 20 parts of nano-silica aqueous dispersion (solid content approximately 30%);

[0054] BYK024 defoamer 0.2 parts;

[0055] 2 parts of CS2 stabilizer;

[0056] SS2 silicone hydrophobic agent, 6 parts;

[0057] 0.1 parts of Texanol film-forming aid;

[0058] 30 parts of industrial ethanol;

[0059] rheology modifier ACRYSOL TM RM-12W 0.1 parts (mixed with 2 parts deionized water); and

[0060] 8 parts deionized water.

[0061] Its preparation method is as follows:

[0062] (1) The polymer emulsion, potassium silicate solution, nano silica dispersion, defoamer, stabilizer, hydrophobic agent and ethanol in the above mass fractions are added to the reaction vessel in sequence and stirred and dispersed evenly; wherein the stirring speed is 800-1000 rpm;

[0063] (2) Add the above-mentioned mass fraction of film-forming aid to the mixture obtained in step (1) above, and appropriately increase the rotation speed until it is evenly dispersed;

[0064] (3) Mix the above-mentioned parts by weight of rheology modifier with deionized water and add it to the mixture obtained in step (2) above. Then add the above-mentioned parts by weight of deionized water and continue to disperse evenly to obtain the coating composition 1 for marking surface treatment.

[0065] The obtained paint composition 1 for road marking surface treatment was applied to the dry surface of water-based reflective road marking paint by spraying (for specific methods, please refer to steps 4 and 5 of Comparative Example 1 below). The dry film thickness of the coating was 5 μm. After the solvent evaporated and the coating was fully dried, the surface-treated reflective road marking 1 was obtained.

[0066] The glass transition temperature of the pure acrylic emulsion polymer is 38°C; the solid mass ratio of the pure acrylic emulsion polymer emulsion to the inorganic binder is 1:2.4; and the content of the binder in the coating composition is 20.2%.

[0067] Example 2: Paint composition 2 for road marking surface treatment and reflective road marking 2

[0068] A coating composition for marking surface treatment, comprising, by weight:

[0069] Two parts of pure acrylic emulsion polymer emulsion (50% solid content);

[0070] Potassium silicate (solid content approximately 30%) 36 parts;

[0071] 12 parts of nano-silica aqueous dispersion (solid content approximately 30%);

[0072] BYK024 defoamer 0.2 parts;

[0073] 2 parts of CS2 stabilizer;

[0074] SS2 silicone hydrophobic agent, 6 parts;

[0075] 20 parts of industrial ethanol;

[0076] rheology modifier ACRYSOLTM RM-12W 0.1 parts (mixed with 2 parts deionized water); and

[0077] 20 parts deionized water.

[0078] Its preparation method is as follows:

[0079] (1) The polymer emulsion, potassium silicate solution, nano silica dispersion, defoamer, stabilizer, hydrophobic agent and ethanol in the above mass fractions are added to the reaction vessel in sequence and stirred and dispersed evenly; wherein the stirring speed is 800-1000 rpm;

[0080] (2) Mix the above-mentioned parts by weight of rheology modifier with deionized water and add it to the mixture obtained in step (2) above. Then add the above-mentioned parts by weight of deionized water and continue to disperse evenly to obtain the coating composition 2 for marking surface treatment.

[0081] The obtained coating composition 2 for road marking surface treatment was applied to the dry surface of water-based reflective road marking paint by spraying (for specific methods, please refer to steps 4 and 5 of Comparative Example 1 below). The dry film thickness of the coating was 5 μm. After the solvent evaporated and the coating was fully dried, the surface-treated reflective road marking 2 was obtained.

[0082] The glass transition temperature of the pure acrylic emulsion polymer is 30°C; the solid mass ratio of the pure acrylic emulsion polymer emulsion to the inorganic binder is 1:14.4; and the content of the binder in the coating composition is 18.4%.

[0083] Example 3: Paint composition 3 for road marking surface treatment and reflective road marking 3

[0084] A coating composition for marking surface treatment, comprising, by weight:

[0085] Two parts of pure acrylic emulsion polymer emulsion (50% solid content);

[0086] Potassium silicate (solid content approximately 30%) 25 parts;

[0087] 20 parts of nano-silica aqueous dispersion (solid content approximately 30%);

[0088] BYK024 defoamer 0.2 parts;

[0089] 2 parts of CS2 stabilizer;

[0090] Four parts of fluorosilane-modified hydrophobic agent;

[0091] 0.1 parts of Texanol film-forming aid;

[0092] 25 parts of industrial ethanol;

[0093] rheology modifier ACRYSOL TM RM-12W 0.1 parts (mixed with 2 parts deionized water); and

[0094] 16 portions of deionized water.

[0095] (1) The polymer emulsion, potassium silicate solution, nano silica dispersion, defoamer, stabilizer, hydrophobic agent and ethanol in the above mass fractions are added to the reaction vessel in sequence and stirred and dispersed evenly; wherein the stirring speed is 800-1000 rpm;

[0096] (2) Add the above-mentioned mass fraction of film-forming aid to the mixture obtained in step (1) above, and appropriately increase the rotation speed until it is evenly dispersed;

[0097] (3) Mix the above-mentioned parts by weight of rheology modifier with deionized water and add it to the mixture obtained in step (2) above. Then add the above-mentioned parts by weight of deionized water and continue to disperse evenly to obtain the coating composition 3 for marking surface treatment.

[0098] The obtained paint composition 3 for road marking surface treatment was applied by spraying onto the dried surface of water-based reflective road marking paint (for specific methods, please refer to steps 4 and 5 of Comparative Example 1 below). The dry film thickness of the coating was 5 μm. After the solvent evaporated and the coating was fully dried, the surface-treated reflective road marking 3 was obtained.

[0099] The glass transition temperature of the pure acrylic emulsion polymer is 45℃; the solid mass ratio of the pure acrylic emulsion polymer emulsion to the inorganic binder is 1:13.5; and the content of the binder in the coating composition is 16.4%.

[0100] Comparative Example 1: Reflective road markings not coated with the paint composition for road marking surface treatment of the present invention

[0101] The following comparative examples describe prior art water-based reflective road marking paint compositions and reflective road markings treated with such paint compositions.

[0102] The existing water-based reflective road marking paint composition comprises component A and component B:

[0103] Component A, by weight, includes the following components: 36 parts of pure acrylic emulsion (47% solids content), 0.3 parts of ammonia, and TAMOL pigment dispersant. TM 901 0.5 parts, wetting agent ECOSURF TMBD109 0.3 parts, defoamer BYK024 0.4 parts, 1000-mesh titanium dioxide 10 parts, heavy calcium carbonate 37 parts, film-forming aid Texanol 2 parts, industrial ethanol 2 parts, rheology modifier ACRYSOL TM RM-12W 0.3 parts, deionized water 2 parts;

[0104] Component B consists of 30-mesh solid glass beads, with a sowing area of ​​400 g / m². 2 .

[0105] The above-mentioned water-based reflective road marking paint is prepared by the following method:

[0106] (1) Add the pure acrylic emulsion, 1 / 2 of the total amount of ammonia, pigment dispersant, wetting agent, and 1 / 2 of the total amount of defoamer into the reaction vessel in sequence, and stir to disperse evenly;

[0107] (2) Add titanium dioxide and heavy calcium carbonate to the mixture prepared in step (1) above and disperse them evenly at high speed; or add the slurry made by grinding titanium dioxide and heavy calcium carbonate to the mixture prepared in (1) and stir to disperse.

[0108] (3) Mix the film-forming aid, the remaining 1 / 2 of the defoamer, ethanol and water and add them to the mixed slurry prepared in step (2) and disperse at high speed. Finally, add the mixture of rheology aid and water and the remaining 1 / 2 of the total amount of ammonia water and disperse at low speed until uniformly dispersed to obtain component A.

[0109] (4) The area of ​​sowing 30-mesh solid glass beads is 400 g / m². 2 .

[0110] (5) Apply component A prepared in step (3) to the substrate tinplate by spraying. Before component A is fully dried, spray component B prepared in step (4) onto the component A coating, so that it is partially embedded therein. After drying, the reflective marking is obtained. The marking without coating the marking surface treatment paint composition of the present invention is used as comparative example marking 1.

[0111] Comparative Example 2: The paint composition and its reflective road markings were used as a comparison.

[0112] The polymer resin content and inorganic binder ratio described in the following comparative examples are higher than those described in the coating compositions of the present invention, and therefore are used as Comparative Example 2.

[0113] A coating composition for marking surface treatment, comprising, by weight:

[0114] 40 parts of pure acrylic emulsion polymer emulsion (50% solid content);

[0115] Five parts of potassium silicate solution (solid content approximately 30%);

[0116] Five parts of nano-silica aqueous dispersion (solid content approximately 30%);

[0117] BYK024 defoamer 0.2 parts;

[0118] 2 parts of CS2 stabilizer;

[0119] SS2 silicone hydrophobic agent, 6 parts;

[0120] 0.3 parts of Texanol film-forming aid;

[0121] 10 parts of industrial ethanol;

[0122] rheology modifier ACRYSOL TM RM-12W 0.1 parts (mixed with 2 parts deionized water); and

[0123] 43 portions of deionized water.

[0124] Its preparation method is as follows:

[0125] (1) The polymer emulsion, potassium silicate solution, nano silica dispersion, defoamer, stabilizer, hydrophobic agent and ethanol in the above mass fractions are added to the reaction vessel in sequence and stirred and dispersed evenly; wherein the stirring speed is 800-1000 rpm;

[0126] (2) Add the above-mentioned mass fraction of film-forming aid to the mixture obtained in step (1) above, and appropriately increase the rotation speed until it is evenly dispersed;

[0127] (3) Mix the above-mentioned parts by weight of rheology modifier with deionized water and add it to the mixture obtained in step (2) above. Then add the above-mentioned parts by weight of deionized water and continue to disperse evenly to obtain a coating composition for marking surface treatment as a comparison.

[0128] The above-obtained paint composition for road marking surface treatment was applied by spraying onto the surface of a dry water-based reflective road marking paint, wherein the coating thickness was 5 μm. After the solvent evaporated and the coating was fully dried, a surface-treated reflective road marking 2 was obtained as a comparison.

[0129] The glass transition temperature of the pure acrylic emulsion polymer is 38°C; the solid mass ratio of the pure acrylic emulsion polymer emulsion to the inorganic binder is 6.7:1; and the content of the binder in the coating composition is 20%.

[0130] The markings obtained in Examples 1-3 and Comparative Examples 1-2 are then tested. The testing standards are as follows:

[0131] Abrasion resistance: GB / T 1768 Test method for abrasion resistance of paint film;

[0132] Alkali resistance: GB / T 9265 Determination of alkali resistance of architectural coatings;

[0133] Retroreflection coefficient: determined by a retroreflection tester according to GB / T 16311-2005.

[0134] The abrasion resistance, alkali resistance, and retroreflective properties of the markings obtained in Examples 1-3 and Comparative Examples 1-2 are shown in Table 1 below.

[0135] Table 1 shows the performance of the markings obtained from each embodiment and comparative example.

[0136]

[0137] Near-infrared reflectance performance was determined by directly reading the relative (standard reflective surface) signal intensity (%) from the point cloud map obtained using the Velodyne 16 linear lidar (VLP-16), as shown in Table 2 below.

[0138] Table 2. Near-infrared lidar reflection performance of the examples and comparative examples.

[0139]

[0140] As can be seen from Tables 1 and 2 above, compared with the comparative examples, the retroreflective brightness coefficient and near-infrared reflective performance of the reflective road markings described in Examples 1-3 are significantly improved after treatment with the corresponding coating compositions of the present invention. At the same time, their wear resistance, alkali resistance, and other performance parameters are also superior to national standards.

[0141] The test results of the surface modification effect of the treated road markings are as follows: Figure 1 and 2 As shown.

[0142] More intuitively, from Figure 2 As can be seen, after treatment with the coating composition of the present invention, water shrinks into water droplets. Accordingly, the road performance described in the present invention is particularly suitable for wet environments, especially rainy night conditions, ensuring that vehicles driven by drivers or controlled by autonomous driving systems can better and faster identify road markings in rainy nights, thereby reducing the risk of accidents.

[0143] Results of wastewater resistance test: Figure 3As shown, the patterned area is coated with the reflective outline surface treatment coating composition described in this invention. The pigment simulating wastewater does not contaminate the areas coated with the coating composition of this invention, while the pigment in the uncoated peripheral areas is contaminated.

[0144] More specifically, the testing method is as follows: First, a cutout template with the letter 'n' is used to cover the reflective markings. Then, the surface treatment coating composition described in this invention is sprayed on, forming a coated logo area surrounded by an uncoated ordinary surface. Next, blue pigment is used to simulate sewage spilled on the marking surface, and it is visible that the area with the letter 'n' is not covered by sewage.

[0145] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A method of using a paint composition for a retroreflective pavement marking surface treatment, characterized by, The coating composition comprises, by mass parts: The binder comprises a polymer resin and an inorganic binder, and the mass ratio of the polymer resin to the inorganic binder is 1:13.5-1:15; The polymer resin is a polymer emulsion stabilized by an anionic surfactant, and the polymer emulsion is selected from a styrene-acrylic emulsion polymer or a pure acrylic emulsion polymer; The inorganic binder is selected from an alkali metal silicate, a silica sol, or a combination of both; The co-solvent is selected from ethanol and / or isopropanol; The use method is to apply the coating composition on a tack-free or dry road marking to form a dry film thickness of 5-20 μm.

2. The method of use of claim 1, wherein, The alkali metal silicate is a potassium silicate solution.

3. The method of use of claim 1, wherein, The silica sol is an organically modified silica sol.

4. The method of use of claim 1, wherein, The hydrophobic agent is selected from one or a combination of several of a fluorosilane, a polysilazane, a paraffin emulsion, an organosiloxane polymer, a polytetrafluoroethylene PTFE wax powder, a polyethylene PE wax powder, and a polypropylene PP wax powder dispersion.

5. The method of use of claim 1, wherein, The co-solvent is 25-35 parts of ethanol.

6. The method of use of claim 1, wherein, The auxiliary agent comprises one or several of a stabilizer, a defoaming agent, a film-forming aid, and a rheological aid.

7. The method of use of claim 6, wherein, The auxiliary agent comprises, by mass parts:

8. The method of use of claim 7, wherein, The preparation method of the coating composition comprises the following steps: (1) sequentially adding the binder, the stabilizer, the defoaming agent, the hydrophobic agent, and the co-solvent into a reaction container, and stirring and dispersing them uniformly, wherein the stirring speed is 800-1000 rpm; (2) adding a mixture of the rheological aid and water into the mixture obtained in step (1) above, and continuing to stir at high speed until the mixture is uniformly dispersed, thereby obtaining the coating composition.

9. The method of use of claim 8, wherein, The preparation method further comprises, before step (2), a step of adding the film-forming aid into the mixture obtained in step (1) above, and increasing the stirring speed.

10. A road marking coated with the coating composition as described in the use method of any one of claims 1-7.

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