Anti-bulge hot-melt reflective marking composite coating as well as preparation method and use method thereof

Abstract

The invention belongs to the technical field of marking coatings, and particularly relates to an anti-bulge hot-melt reflective marking composite coating as well as a preparation method and a use method thereof. The composite coating comprises an epoxy primer and a marking coating coated on the epoxy primer, the epoxy primer is composed of a component A and a component B, the component A comprises 40-55 parts of epoxy resin, 15-40 parts of a solvent a and 5-10 parts of a diluent; the component B comprises 20-40 parts of a solvent b, 15-50 parts of a curing agent and 0.2-2 parts of an accelerant; the solvent a and the solvent b are at least one of acetone and propylene glycol monomethyl ether; the marking coating is prepared from 25-30 parts of petroleum resin, 15-20 parts of reflective glass beads, 40-50 parts of filler, 2-5 parts of plasticizer, 3-5 parts of pigment, 0.3-0.5 part of flatting agent and 0.5-1 part of antioxidant. According to the invention, the epoxy primer is used as an isolating layer, so that moisture in asphalt is effectively prevented from permeating, the anti-bulge capability of the hot-melt marking line is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of marking paints, and particularly relates to an anti-bulging hot-melt reflective marking composite paint and its preparation method and usage method. Background Art

[0002] With the rapid development of the transportation industry, road markings, as an important part of traffic safety, have become one of the most important road infrastructure in modern traffic facilities. Markings are not only used to indicate the driving direction of vehicles and lane separation, but also play a role in guiding and reminding drivers at night or under adverse weather conditions. Traditional marking paints generally use solvent-based or water-based paints. Although these paints have certain durability and reflectivity, with the increase in traffic volume and changes in weather conditions, marking paints often face problems such as coating peeling, deformation, and attenuation of the reflective effect. Especially in high-temperature or high-humidity environments, the performance of the markings may be significantly affected, resulting in reduced visibility and traffic safety of the markings.

[0003] Different from traditional solvent-based marking paints, hot-melt reflective marking paints are directly coated on the road surface after being heated and melted, which can be quickly cured, avoiding environmental pollution caused by solvent volatilization, while improving the construction efficiency and the wear resistance, weather resistance, and adhesion of the coating. In addition, hot-melt marking paints usually also add reflective glass beads, making the markings have a stronger reflective effect at night or under poor lighting conditions. Therefore, hot-melt reflective marking paints have gradually become the mainstream choice in the current road marking market.

[0004] However, hot-melt reflective marking paints have instability phenomena such as coating deformation and bulging caused by water overflow in high-temperature environments, especially in applications on asphalt roads. Asphalt has strong temperature dependence and is prone to releasing water at high temperatures, resulting in phenomena such as swelling, blistering, or peeling on the surface of the marking paint, seriously affecting the service life and reflective performance of the coating, and thus affecting traffic safety.

[0005] Existing solutions mostly focus on enhancing the weather resistance or water resistance of the paint itself, but rarely pay attention to the effective isolation layer between the paint and the road surface. In order to further improve the stability of the paint under high-temperature conditions and avoid coating damage caused by water volatilization, there is an urgent need to develop an effective solution. Summary of the Invention

[0006] Aiming at the problems and deficiencies existing in the prior art, the purpose of the present invention is to provide an anti-bulging hot-melt reflective marking composite paint and its preparation method and usage method.

[0007] Based on the above purpose, the present invention adopts the following technical solutions:

[0008] In the first aspect of the present invention, a heat-melt reflective marking composite coating resistant to bulging is provided, which includes an epoxy primer and a marking coating applied on top of the epoxy primer.

[0009] The epoxy primer consists of two components, A and B; the component A includes raw materials in the following weight parts: 40 - 55 parts of epoxy resin, 15 - 40 parts of solvent a, and 5 - 10 parts of diluent; the component B includes raw materials in the following weight parts: 20 - 40 parts of solvent b, 15 - 50 parts of curing agent, and 0.2 - 2 parts of accelerator; the solvent a and the solvent b are at least one of acetone and propylene glycol methyl ether.

[0010] The marking coating includes raw materials in the following weight parts: 25 - 30 parts of petroleum resin, 15 - 20 parts of reflective glass beads, 40 - 50 parts of filler, 2 - 5 parts of plasticizer, 3 - 5 parts of pigment, 0.3 - 0.5 parts of leveling agent, and 0.5 - 1 part of antioxidant.

[0011] Preferably, the epoxy resin is at least one of E44 and E51.

[0012] Preferably, the curing agent is at least one of diethylenetriamine, T31, and polyamide 650.

[0013] Preferably, the diluent is AGE; the accelerator is DMP-30.

[0014] Preferably, the petroleum resin is C5 / C9 copolymerized petroleum resin; the filler is a composition composed of calcium carbonate, quartz sand, and silica powder in a mass ratio of 1:1:1; the plasticizer is DOP; the pigment is titanium dioxide; the leveling agent is BYK-306; the antioxidant is DLTDP.

[0015] More preferably, the particle size of the calcium carbonate is 200 mesh, the particle size of the quartz sand is 80 mesh, and the particle size of the silica powder is 800 mesh.

[0016] Preferably, the particle size of the reflective glass beads is 40 mesh.

[0017] In the second aspect of the present invention, a preparation method of the heat-melt reflective marking composite coating resistant to bulging described in the first aspect above is provided, which includes the preparation of the epoxy primer and the preparation of the marking coating.

[0018] The preparation steps of the epoxy primer are as follows:

[0019] S1. Preparation of component A: Stir the epoxy resin at a speed of 300 - 400 rpm, slowly add solvent a, continue stirring for 10 - 15 minutes, then gradually add the diluent, stir evenly, and filter to obtain component A;

[0020] S2. Preparation of Component B: Stir the solvent b at a speed of 200 - 400 rpm, slowly add the curing agent, continue stirring for 15 - 20 minutes, and finally add the accelerator and stir for 10 - 15 minutes. Filter to obtain Component B;

[0021] S3. Mix Component A and Component B evenly according to the dosage ratio of 1:1 to obtain the epoxy primer.

[0022] The preparation steps of the marking paint are as follows:

[0023] Heat the petroleum resin to the molten state at 170 - 180 °C, add the plasticizer and antioxidant for the first stirring, sequentially add calcium carbonate, quartz sand, and titanium dioxide for the second stirring, then add the leveling agent for the third stirring after the first temperature reduction, continue to add the reflective glass beads for the fourth stirring after the second temperature reduction, cool, and pulverize to obtain the marking paint.

[0024] Preferably, the speed of the first stirring is 350 rpm; the speed of the second stirring is 300 - 600 rpm, and the stirring time is 30 minutes; the speed of the third stirring is 200 rpm, and the stirring time is 5 minutes; the speed of the fourth stirring is 150 rpm, and the stirring time is 5 - 10 minutes; the temperature of the first temperature reduction is 120 - 140 °C; the temperature of the second temperature reduction is below 120 °C.

[0025] The third aspect of the present invention provides a method for using the anti - bulging hot - melt reflective marking composite paint described in the first aspect above, including the following steps: Coating the epoxy primer on the road surface by spraying or rolling, waiting for preliminary curing, and then heating the marking paint to the molten state and coating it on top of the epoxy primer.

[0026] Preferably, the coating thickness of the epoxy primer is 60 - 120 μm; the heating and melting temperature of the marking paint is 180 - 200 °C.

[0027] Furthermore, the road surface should be kept dry and clean before coating the epoxy primer.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The epoxy primer constructs an isolation layer to improve the durability of the marking: The present invention coats the epoxy primer on the asphalt road surface, enabling it to firmly adhere to the road surface and form an effective isolation layer, blocking the seepage of water in the asphalt, and preventing the marking from bulging in high - temperature environments from the source. At the same time, the sealing and weather resistance of the primer enhance the service life of the marking and improve the chemical corrosion resistance, enabling it to maintain good structural stability in complex environments.

[0030] 2. Double-layer structure enhances coating stability: Through the double-layer structure design of epoxy primer and marking paint, the present invention effectively reduces the influence of the marking paint on road surface deformation and moisture invasion. The primer provides a firm support, making the marking paint less likely to crack or peel under rolling, and still maintaining good adhesion and structural integrity even in high-temperature and high-humidity environments. This design reduces the maintenance frequency and ensures that the markings remain clearly visible for a long time under complex road conditions.

[0031] 3. Optimize the primer formulation to achieve performance balance: By adjusting the types and ratios of epoxy resin, solvent, and curing agent, the present invention balances the permeability and volatility of the primer, enabling it to cure in a short time while having good toughness, adhesion, and sealing properties.

[0032] 4. Synergistic effect of composite coatings: By optimizing the compatibility between the primer and the marking paint, the present invention significantly improves the overall performance of the composite coating. When the polarity of the primer and the marking paint matches, the adhesion is stronger, reducing the risk of peeling and bulging; at the same time, the flexibility of the primer is reasonably controlled to adapt to minor road surface deformations, thereby enhancing the durability of the markings. In addition, the thermal expansion coefficient matching is optimized to ensure that the coating remains stable under temperature changes and long-term use, further enhancing the wear resistance and structural integrity of the marking paint. Detailed implementation mode

[0033] To make the purpose, technical solutions and advantages of the present invention clearer, the following further elaborates on the present invention through examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] (1) Preparation of a hot-melt reflective marking composite coating resistant to bulging

[0035] Example 1

[0036] A hot-melt reflective marking composite coating resistant to bulging, comprising an epoxy primer and a marking paint coated on top of the epoxy primer.

[0037] The epoxy primer consists of two components, A and B; Component A includes the following raw materials in parts by weight: 50 parts of epoxy resin E51, 20 parts of solvent a (acetone), and 15 parts of diluent AGE; Component B includes the following raw materials in parts by weight: 25 parts of solvent b (acetone), 16 parts of curing agent T31, and 0.3 part of accelerator DMP-30.

[0038] The marking paint includes the following raw materials in parts by weight: 45 parts of C5 / C9 copolymerized petroleum resin, 18 parts of reflective glass beads (40 mesh), 35 parts of filler (calcium carbonate: quartz sand: silica powder = 1:1:1), 4 parts of plasticizer DOP, 4 parts of titanium dioxide, 0.4 part of leveling agent BYK-306, and 0.6 part of antioxidant DLTDP.

[0039] The preparation method of the above-mentioned anti-bulging hot-melt reflective marking composite coating includes the preparation of epoxy primer and the preparation of marking coating.

[0040] The preparation steps of the epoxy primer are as follows:

[0041] S1. Preparation of component A: Add epoxy resin E51 to a stirring container, stir at 350 rpm, slowly add acetone, and stir for 12 minutes until transparent; add AGE, continue to stir for 10 minutes, and filter to obtain component A.

[0042] S2. Preparation of component B: Add acetone to a container, stir at 300 rpm, slowly add T31, and stir for 18 minutes until dissolved; add DMP-30, stir for 12 minutes, and filter to obtain component B.

[0043] S3. Mix component A and component B according to the dosage ratio of 1:1, and mechanically stir (700 rpm) for 12 minutes to obtain epoxy primer.

[0044] The preparation steps of the marking coating are as follows:

[0045] Heat C5 / C9 copolymerized petroleum resin to 175 °C for melting, add plasticizer DOP and antioxidant DLTDP, stir at 350 rpm for 10 minutes until homogeneous, successively add dry calcium carbonate, quartz sand, silica powder, and titanium dioxide, stir at 600 rpm for 30 minutes until there are no particles, cool down to 130 °C, add leveling agent BYK-306, stir at 200 rpm for 5 minutes, cool down to below 90 °C, add reflective glass beads, stir at 100 rpm for 8 minutes, and cool and granulate to obtain the marking coating.

[0046] Example 2

[0047] The composition of an anti-bulging hot-melt reflective marking composite coating is basically the same as that of Example 1, and the difference is that: the solvent a is 10 parts of acetone and 10 parts of propylene glycol monomethyl ether.

[0048] The preparation method of the above-mentioned anti-bulging hot-melt reflective marking composite coating is the same as that of Example 1.

[0049] Example 3

[0050] The composition of an anti-bulging hot-melt reflective marking composite coating is basically the same as that of Example 1, and the difference is that: the solvent a is 12 parts of acetone and 8 parts of propylene glycol monomethyl ether.

[0051] The preparation method of the above-mentioned anti-bulging hot-melt reflective marking composite coating is the same as that of Example 1.

[0052] Example 4

[0053] The composition of a heat - melt reflective road marking composite coating resistant to bulging is basically the same as that of Example 3, and the difference lies in that: the curing agent is 45 parts of polyamide 650.

[0054] The preparation method of the above - mentioned heat - melt reflective road marking composite coating resistant to bulging is the same as that of Example 3.

[0055] Example 5

[0056] The composition of a heat - melt reflective road marking composite coating resistant to bulging is basically the same as that of Example 3, and the difference lies in that: the curing agent is 16 parts of diethylenetriamine.

[0057] The preparation method of the above - mentioned heat - melt reflective road marking composite coating resistant to bulging is the same as that of Example 3.

[0058] Example 6

[0059] The composition of a heat - melt reflective road marking composite coating resistant to bulging is basically the same as that of Example 3, and the difference lies in that: the curing agent is 5 parts of T31 and 10 parts of polyamide 650.

[0060] The preparation method of the above - mentioned heat - melt reflective road marking composite coating resistant to bulging is the same as that of Example 3.

[0061] Example 7

[0062] The composition of a heat - melt reflective road marking composite coating resistant to bulging is basically the same as that of Example 6, and the difference lies in that: the epoxy resin is 50 parts (E44:E51 = 1:1).

[0063] The preparation method of the above - mentioned heat - melt reflective road marking composite coating resistant to bulging is the same as that of Example 6.

[0064] Example 8

[0065] The composition of a heat - melt reflective road marking composite coating resistant to bulging is basically the same as that of Example 7, and the difference lies in that: the epoxy resin is 50 parts (E44:E51 = 1:2).

[0066] The preparation method of the above - mentioned heat - melt reflective road marking composite coating resistant to bulging is the same as that of Example 7.

[0067] Comparative Example 1

[0068] The composition of a heat - melt reflective road marking coating is basically the same as that of Example 1, and the difference lies in that: it does not include an epoxy primer.

[0069] The preparation method of the above - mentioned heat - melt reflective road marking coating is basically the same as that of Example 1, and the difference lies in that: it does not include the preparation of an epoxy primer.

[0070] Comparative Example 2 Epoxy primer with poor sealing

[0071] A heat-melt reflective marking composite coating resistant to bulging, comprising an epoxy primer and a marking coating applied on top of the epoxy primer.

[0072] The epoxy primer consists of two components, A and B; Component A includes the following raw materials in parts by weight: 50 parts of epoxy resin E51, 35 parts of solvent a (acetone), and 5 parts of diluent AGE; Component B includes the following raw materials in parts by weight: 35 parts of solvent b (acetone), 15 parts of curing agent diethylenetriamine, and 0.2 parts of accelerator DMP-30.

[0073] The composition of the marking coating is the same as that in Example 1.

[0074] The preparation method of the above heat-melt reflective marking composite coating resistant to bulging is the same as that in Example 1.

[0075] Epoxy primer with poor permeability in Comparative Example 3

[0076] A heat-melt reflective marking composite coating resistant to bulging, comprising an epoxy primer and a marking coating applied on top of the epoxy primer.

[0077] The epoxy primer consists of two components, A and B; Component A includes the following raw materials in parts by weight: 50 parts of epoxy resin E51, 5 parts of solvent a (acetone) and 5 parts of propylene glycol methyl ether, and 5 parts of diluent AGE; Component B includes the following raw materials in parts by weight: 10 parts of solvent b (acetone), 15 parts of curing agent diethylenetriamine, and 0.3 parts of accelerator DMP-30.

[0078] The composition of the marking coating is the same as that in Example 1.

[0079] The preparation method of the above heat-melt reflective marking composite coating resistant to bulging is the same as that in Example 1.

[0080] (II) Usage method of the heat-melt reflective marking composite coating resistant to bulging

[0081] A usage method of a heat-melt reflective marking composite coating resistant to bulging, comprising the following steps:

[0082] (1) Road surface preparation:

[0083] Clean the road surface: Ensure that the construction area is free of dust, oil stains and other pollutants to improve the adhesion of the coating.

[0084] Drying treatment: Ensure that the road surface is dry before construction to avoid affecting the curing effect of the coating due to moisture.

[0085] (2) Epoxy primer coating:

[0086] Primer coating: Uniformly coat the epoxy primer by spraying or rolling, and control the coating thickness within 60 - 120 μm.

[0087] Static curing: After applying the primer, keep the environment well-ventilated and wait for the primer to initially cure.

[0088] (3) Construction of marking paint:

[0089] Heating and melting: Heat the prepared hot-melt marking paint to 180 - 200 °C and keep it in a uniformly molten state.

[0090] Coating construction: Use a special hot-melt line marking machine to uniformly coat the molten marking paint on the cured epoxy primer, with a coating thickness of 1.5 - 2.5 mm.

[0091] Natural cooling: After the marking construction is completed, wait for it to cool for secondary curing.

[0092] (III) Performance testing of the anti-bulging hot-melt reflective marking composite paint

[0093] Coat the paints prepared in Examples 1 - 8 and Comparative Examples 1 - 3 on the porous asphalt plate using the above method, record the curing time of the epoxy primer. After curing at room temperature for 7 days, test the penetration depth of the epoxy primer, the adhesion, abrasion resistance, and appearance effect of the composite paint. The test results are shown in Tables 1 and 2. Among them, the appearance effect of the composite paint is checked for bulging and cracking through a damp heat cycle (-30 °C / 95% RH to 80 °C / 95% RH).

[0094] Table 1 Comparison of the properties of the epoxy primers in Examples 1 - 8 and Comparative Examples 2 - 3

[0095] Number Surface drying time (25℃) Penetration depth (bituminous substrate) Primer adhesion (MPa) Sealing property (porosity %) Example 1 2-3h 80 - 120μm 2.0 15～20％ Example 2 3-4h 120 - 180μm 2.0 8～12％ Example 3 2-3h 100 - 150μm 2.1 10～15％ Example 4 4-5h 70 - 100μm 2.5 20～25％ Example 5 0.5-1h 40 - 60μm 1.4 25～30％ Example 6 2-3h 130 - 190μm 3.1 5～10％ Example 7 1.5-2h 120 - 180μm 3.2 5～10％ Example 8 1.5-2h 150 - 200μm 3.8 ＜5％ Comparative Example 2 0.5-1h 200 - 250μm 1.2 40～50％ Comparative Example 3 4-5h 20 - 40μm 1.4 30～40％

[0096] Table 2 Test of the effects of the composite paints in Examples 1 - 8 and Comparative Examples 1 - 3

[0097] Number Bump area (7 - day damp heat cycle) Crack condition Marking adhesion (MPa) Example 1 5％～10％ Slight 1.8 Example 2 3％～5％ None 2.2 Example 3 2％～3％ None 2.8 Example 4 8％～12％ Obvious 3.0 Example 5 15％～20％ Severe 0.8 Example 6 1％～2％ None 3.5 Example 7 1％～2％ None 3.5 Example 8 ＜0.5 None 4.0 Comparative Example 1 70％～80％ Severe / Comparative Example 2 50％～70％ Severe 0.7 Comparative Example 3 30％～50％ Medium 1.2

[0098] (IV) Analysis of the influencing factors of the anti-bulging hot-melt reflective marking composite paint

[0099] In a high-temperature environment, the hot-melt reflective marking paint has instability phenomena such as coating deformation and bulging caused by water overflow, especially in the application on asphalt pavements. In the present invention, a layer of epoxy primer is first applied on the asphalt pavement. The epoxy primer firmly adheres to the asphalt pavement, has excellent permeability, adhesion, and good sealing properties, cures in a short time while having sufficient toughness to adapt to the minor deformation of the road surface, forms an effective isolation layer, and effectively blocks the water seepage from the asphalt.

[0100] From the comparative data of the composite coatings in Examples 1 to 8 and Comparative Examples 1 to 3, it can be seen that the epoxy primer indeed plays a role in blocking the exudation of moisture in the asphalt to a certain extent. From Comparative Example 2 and Comparative Example 3, it can be seen that when the sealing and permeability of the epoxy primer are poor, its sealing effect will be greatly reduced, and the hot-melt marking still shows bulging phenomena.

[0101] 4.1 Influence factors of epoxy primer performance

[0102] (1) Solvent system

[0103] According to Table 1, from the comparative data of the epoxy primer performance in Examples 1, 2, 3 and Comparative Examples 2, 3, it can be seen that the solvent system needs to balance permeability and volatility. Acetone volatilizes quickly to ensure surface dryness, and propylene glycol methyl ether delays deep curing. Increasing the proportion of acetone will reduce the surface dry time, but the sealing property will be weakened; increasing the proportion of propylene glycol methyl ether will increase the penetration depth, but the surface dry time will be prolonged.

[0104] (2) Curing agent

[0105] According to Table 1, from the comparative data of the epoxy primer performance in Examples 1, 4, 5, 6, it can be seen that when using curing agent T31, the surface dry time of the epoxy primer is relatively fast, but the brittleness is high; when using curing agent polyamide 650, the flexibility will be improved, but the surface dry time will increase; when using curing agent diethylenetriamine, the primer will cure in an extremely short time, but the adhesion is poor and the brittleness is large. In the present invention, T31 and polyamide 650 are combined to enable the primer to simultaneously maintain excellent permeability, sealing property and certain flexibility under the condition of rapid curing.

[0106] (3) Epoxy resin

[0107] According to Table 1, from the epoxy primer performance data in Examples 7, 8, it can be seen that when the ratio of E44:E51 is increased to 1:2, the adhesion and penetration depth of the primer can be improved, because the reduction of epoxy equivalent can improve the reaction efficiency of the curing agent and enhance the crosslinking density.

[0108] 4.2 Synergistic effect of composite coating

[0109] (1) Primer - marking interface matching

[0110] When the interface between the primer and the hot-melt marking is relatively well-matched, the system has a large adhesion. For example, in Example 3, the polarity of the epoxy primer + T31 curing agent + C5 / C9 resin is well-matched, and the adhesion ≥ 2.0 MPa; while in Example 5, the polarity difference of the epoxy primer + diethylenetriamine + C5 / C9 resin is large, and the adhesion is only 1.4 MPa.

[0111] (2) Coefficient of thermal expansion (CTE) matching

[0112] The primer has a certain toughness to adapt to the minor deformations of the road surface. For example, adding polyamide 650 in Examples 6, 7, and 8 can increase the toughness of the primer and result in a smaller bulging area.

[0113] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Those skilled in the art can modify or equivalently replace the technical solutions of the present invention according to the idea of the present invention, without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A hot-melt reflective composite coating for preventing bulging, characterized in that: It includes an epoxy primer and a road marking paint applied on the epoxy primer; The epoxy primer is composed of two components, A and B; the A component includes the following raw materials by weight: 40-55 parts of epoxy resin, 15-40 parts of solvent a, and 5-10 parts of diluent; the B component includes the following raw materials by weight: 20-40 parts of solvent b, 15-50 parts of curing agent, and 0.2-2 parts of accelerator; the solvent a and the solvent b are at least one of acetone and propylene glycol methyl ether; The road marking paint comprises the following raw materials in parts by weight: 25-30 parts of petroleum resin, 15-20 parts of reflective glass beads, 40-50 parts of fillers, 2-5 parts of plasticizers, 3-5 parts of pigments, 0.3-0.5 parts of leveling agents, and 0.5-1 parts of antioxidants.

2. The anti-bulging hot-melt reflective marking composite coating according to claim 1, characterized in that: The epoxy resin is at least one of E44 and E51.

3. The anti-bulging hot-melt reflective marking composite coating according to claim 1, characterized in that: The curing agent is at least one of diethylenetriamine, T31 and polyamide 650.

4. The anti-bulging hot-melt reflective marking composite coating according to claim 1, characterized in that: The diluent is AGE; the accelerator is DMP-30.

5. The anti-bulging hot-melt reflective marking composite coating according to claim 1, characterized in that: The petroleum resin is C5 / C9 copolymerized petroleum resin; the filler is a composition of calcium carbonate, quartz sand and silicon micropowder in a mass ratio of 1:1:1; the plasticizer is DOP; the pigment is titanium dioxide; the leveling agent is BYK-306; and the antioxidant is DLTDP.

6. The method for preparing the anti-bulging hot-melt reflective marking composite coating according to any one of claims 1 to 5, characterized in that: Including the preparation of epoxy primer and road marking paint: The preparation steps of the epoxy primer are as follows: S1. Preparation of component A: Stir the epoxy resin at a speed of 300 to 400 rpm, slowly add solvent a, continue stirring for 10 to 15 minutes, then gradually add the diluent, stir evenly, and filter to obtain component A; S2, preparation of component B: stir solvent b at a speed of 200-400 rpm, slowly add curing agent, continue stirring for 15-20 minutes, finally add accelerator and stir for 10-15 minutes, and filter to obtain component B; S3, mixing component A and component B in a dosage ratio of 1:1 to obtain an epoxy primer; The preparation steps of the road marking paint are as follows: The petroleum resin is heated to a molten state at 170-180°C, a plasticizer and an antioxidant are added for the first stirring, calcium carbonate, quartz sand and titanium dioxide are added in sequence for the second stirring, and then the leveling agent is added for the third stirring after the first cooling, and reflective glass beads are added for the fourth stirring after the second cooling, cooled and crushed to obtain the marking paint.

7. The method for preparing the anti-bulging hot-melt reflective marking composite coating according to claim 6, characterized in that: The first stirring speed is 350 rpm; the second stirring speed is 300-600 rpm, and the stirring time is 30 minutes; the third stirring speed is 200 rpm, and the stirring time is 5 minutes; the fourth stirring speed is 150 rpm, and the stirring time is 5-10 minutes; the first cooling temperature is 120-140°C; the second cooling temperature is below 120°C.

8. The method for using the anti-bulging hot-melt reflective marking composite coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: Apply the epoxy primer to the road surface by spraying or rolling, wait for initial curing, then heat the marking paint to a molten state and apply it on top of the epoxy primer.

9. The method for using the anti-bulging hot-melt reflective marking composite coating according to claim 8, characterized in that: The coating thickness of the epoxy primer is 60-120 μm; the heating melting temperature of the marking paint is 180-200°C.