Magnetic marking paint and method for producing same, magnetic marking and method for producing same

Abstract

The present application belongs to the field of road engineering and intelligent transportation technology, and particularly relates to a magnetic marking paint, a preparation method thereof, a magnetic marking and a preparation method thereof. In order to ensure navigation accuracy, realize controllable cost, strong environmental tolerance and long service life maintenance, the magnetic marking paint comprises the following components in percentage by mass: 50-78% of magnetic material powder, 1-3% of dispersing agent, 5-10% of wear-resistant agent, 2-5% of hydrophobic agent and 10-32% of binder, wherein the binder adjusts the viscosity of the magnetic marking paint to 1800-2500 mPa.s.

Description

Technical Field

[0001] This invention belongs to the field of road engineering and intelligent transportation technology, specifically relating to magnetic marking paint and its preparation method, and magnetic marking and its preparation method. Background Technology

[0002] Intelligent transportation is a major trend in modern transportation development, and autonomous driving technology, as a core component, relies on high-precision and high-reliability navigation systems. Current traffic markings, based on visual recognition principles, are ill-suited for the navigation needs of autonomous vehicles in low-visibility conditions such as rain, fog, nighttime, or road pollution, posing significant safety hazards.

[0003] Current magnetic marking technologies primarily use magnetite powder (Fe3O4) as the magnetic component, with a typical magnetic field strength of 150-200 Gauss (measured at 0.1m). As disclosed in patents such as CN109321078A, magnetite powder is directly incorporated into the coating as aggregate. While possessing basic magnetic properties, this approach suffers from three major technical bottlenecks: 1) Significant magnetic field attenuation: In open environments, the magnetic powder is easily dispersed by mechanical crushing, resulting in an average annual decrease in magnetic retention exceeding 15%; 2) Insufficient navigation accuracy: The magnetic intensity gradient is below 10 Gauss / cm, leading to vehicle positioning errors greater than 10cm; 3) Poor environmental tolerance: Unmodified magnetite powder is prone to oxidation and corrosion in humid and hot environments, with magnetic attenuation reaching 30% after 500 hours of salt spray testing.

[0004] To overcome the performance limitations of magnetite powder, the industry has attempted to introduce high-performance permanent magnet materials. For example, ferrite (SrFe2+) 12 O 19 Neodymium iron boron (NdFeB) materials are distinguished by their high magnetic energy product (ferrite ≥ 20 kJ / m). 3 Neodymium iron boron ≥300kJ / m 3 The issue of NdFeB-based magnetic markings has attracted attention. While theoretically NdFeB-based markings can achieve a strong magnetic field of 400-500 Gauss, they have a fatal flaw: NdFeB develops an oxide layer after 72 hours in environments with humidity >70%, resulting in a magnetic loss rate >5% / month. Furthermore, the high cost of NdFeB makes its use for magnetic markings prohibitively expensive for large-scale deployment. Although ferrites possess natural weather resistance, their inherent magnetic induction (≤200 Gauss) is insufficient for high-precision navigation requirements. Existing improvements involve adding a silicon steel magnetic substrate or gradient magnetization to enhance the effective magnetic field, but this increases the magnetic marking thickness to over 3mm, affecting vehicle ride smoothness. In addition, traditional magnetic markings suffer from systemic defects in road performance aspects such as hydrophobicity, anti-fouling, and wear resistance: surface energy >35mN / m, oil adhesion rate >30%; wear rate >40mg / 1000 revolutions, service life less than 2 years; and yellowing and powdering after 1000 hours of UV irradiation.

[0005] Therefore, there is an urgent need to develop a new type of magnetic marking that can ensure navigation accuracy while achieving cost control, strong environmental tolerance, and long service life, thus meeting the stringent requirements of intelligent transportation for infrastructure. Summary of the Invention

[0006] This invention addresses the aforementioned problems by providing a magnetic marking coating and its preparation method, as well as a magnetic marking and its preparation method. These methods are suitable for navigation of unmanned vehicles and traffic guidance in complex environments, and feature controllable magnetic field strength, high cost-effectiveness, and excellent durability.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] This invention provides a magnetic marking coating, comprising the following components by mass percentage:

[0009] The coating comprises 50%~78% magnetic material powder, 1%~3% dispersant, 5%~10% wear-resistant agent, 2%~5% hydrophobic agent, and 10%~32% binder, wherein the binder adjusts the viscosity of the magnetic marking paint to 1800~2500 mPa·s.

[0010] Furthermore, the magnetic material powder is ferrite and / or neodymium iron boron, with a mass ratio of 0:100 to 100:0; the dispersant is silane coupling agent KH-550 or silane coupling agent KH-560; the wear-resistant agent is silicon carbide, alumina, or quartz sand; the hydrophobic agent is fluorocarbon resin or organosilicon modified resin; and the binder is epoxy resin, polyurethane resin, or acrylic resin.

[0011] Furthermore, the magnetic material powder is coated with a silica or epoxy resin protective layer with a thickness of 0.01~2μm. The silica coating has the following advantages: (1) Chemical inertness: it isolates water, oxygen and acid and alkali corrosion, and the salt spray resistance of NdFeB is improved to ≥2000 h (ASTM B117); (2) Dispersion enhancement: the hydroxyl groups on the silica surface form hydrogen bonds with the resin, and the particle dispersion is improved (D90≤20μm); (3) Magnetic retention: when the coating thickness is ≤200 nm, the ferrite / NdFeB magnetic energy product loss is ≤5%.

[0012] This invention also provides a method for preparing a coating for magnetic marking lines, comprising the following steps:

[0013] Magnetic material powder is added to the binder and stirred at 300-1000 rpm for 30-120 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence and stirred until uniformly dispersed to obtain the magnetic marking coating.

[0014] This invention also provides a method for preparing magnetic marking lines, comprising the following steps:

[0015] Step 1: Clean the asphalt or concrete substrate, lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic base, and spray epoxy primer.

[0016] Step 2: Apply one of the above-mentioned magnetic marking coatings using a scraping or high-pressure airless spraying process;

[0017] Step 3: Magnetize the magnetic marking paint before it cures by applying a pulsed magnetic field and forming a periodic magnetic field through a multi-pole alternating magnetization fixture.

[0018] Step 4: After magnetization, a curing process is performed by spraying UV-cured resin or fluorocarbon coating to obtain the magnetic marking line.

[0019] Furthermore, in step 3, a pulsed magnetic field is applied to form a periodic magnetic field through a multi-pole alternating magnetization fixture, specifically as follows:

[0020] A pulsed magnetic field of 2-3T is applied 2-5 times to form a periodic magnetic field of 50-500 Gauss through a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10-50 Gauss / cm.

[0021] Furthermore, the thickness of the epoxy primer in step 1 is 50~80μm;

[0022] In step 2, the thickness of the paint used for the magnetic marking lines is 0.5~3mm, and the width is 10~20cm;

[0023] The curing process in step 4 specifically involves: curing at room temperature for 24~48 h or heat curing at 60℃ for 1 h; the thickness of the UV-cured resin or fluorocarbon coating is 10~15μm.

[0024] The present invention also provides a method for preparing magnetic markings and the resulting magnetic markings.

[0025] Furthermore, the method for restoring the magnetic properties of the magnetic markings after attenuation includes the following steps:

[0026] The magnetic field strength is detected using a gaussmeter. When the magnetic field strength decreases by ≥10%, pulse magnetization is performed using a multi-pole alternating magnetization fixture.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. Using silane coupling agents as dispersants can improve the dispersibility, interfacial adhesion, and filling rate of magnetic material powder in the binder, indirectly optimizing the overall performance of the magnetic strip, but will not directly enhance the inherent magnetism of the magnetic material powder.

[0029] 2. A wide range of magnetic induction intensity is achieved through the precise ratio of ferrite and neodymium iron boron.

[0030] 3. Through composite modification of the components of the magnetic marking paint, the weather resistance and wear resistance of the magnetic marking are improved.

[0031] 4. After the magnetic properties of the magnetic markings decay, they can be pulsed and remagnetized to extend their service life and avoid frequent replacement of the markings. Detailed Implementation

[0032] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments. Example 1

[0033] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0034] The coating comprises 65% magnetic material powder, 1% dispersant, 7% wear-resistant agent, 2% hydrophobic agent, and 25% binder, wherein the binder adjusts the viscosity of the magnetic marking paint to 2000 mPa·s.

[0035] The magnetic material powder is ferrite, with a mass ratio of ferrite to neodymium iron boron of 100:0; the dispersant is silane coupling agent KH-550; the wear-resistant agent is silicon carbide; the hydrophobic agent is fluorocarbon resin; and the binder is epoxy resin.

[0036] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0037] Magnetic material powder is added to the binder and stirred at 600 rpm for 40 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the magnetic marking coating.

[0038] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0039] Step 1: Clean the asphalt substrate, lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 60μm.

[0040] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 2mm and a width of 15cm.

[0041] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2T pulsed magnetic field twice. A periodic magnetic field of 150 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 20 Gauss / cm.

[0042] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 36 hours; the thickness of the UV-curing resin is 12 μm.

[0043] The method for restoring the magnetic properties of magnetic markings after they have decayed includes the following steps:

[0044] The magnetic field strength is detected using a gaussmeter. When the magnetic field strength decreases by ≥10%, pulse magnetization is performed using a multi-pole alternating magnetization fixture. Example 2

[0045] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0046] The coating comprises 65% magnetic material powder, 2% dispersant, 5% wear-resistant agent, 3% hydrophobic agent, and 25% binder, wherein the binder adjusts the viscosity of the magnetic marking paint to 2000 mPa·s.

[0047] The magnetic material powder is composed of ferrite and neodymium iron boron, with a mass ratio of ferrite to neodymium iron boron of 50:50; the dispersant is silane coupling agent KH-560; the wear-resistant agent is alumina; the hydrophobic agent is organosilicon modified resin; and the binder is acrylic resin.

[0048] In this embodiment, the magnetic material powder is coated with silicon dioxide with a thickness of 1.5 μm using the sol-gel method. The silicon source is tetraethoxysilane (TEOS), the reaction pH is 3~5, and the coating density is ≥95%.

[0049] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0050] Magnetic material powder is added to the binder and stirred at 300 rpm for 120 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence and stirred until uniformly dispersed to obtain the magnetic marking coating.

[0051] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0052] Step 1: Clean the concrete substrate, lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic base, and spray an epoxy primer with a thickness of 80μm.

[0053] Step 2: Apply the magnetic marking paint using a high-pressure airless spraying process. The paint thickness is 1.5 mm and the width is 20 cm.

[0054] Step 3: Magnetize the magnetic marking paint before it cures by applying a 3T pulsed magnetic field 5 times. A periodic magnetic field of 450 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 40 Gauss / cm.

[0055] Step 4: After magnetization, a curing process is performed, followed by spraying a fluorocarbon coating to obtain the magnetic marking line; the curing process is specifically: heat curing at 60℃ for 1 h; the thickness of the fluorocarbon coating is 12 μm. Example 3

[0056] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0057] The coating comprises 60% magnetic material powder, 1% dispersant, 7% wear-resistant agent, 2% hydrophobic agent, and 30% binder, wherein the binder adjusts the viscosity of the magnetic marking coating to 2500 mPa·s.

[0058] The magnetic material powder is ferrite, with a mass ratio of ferrite to neodymium iron boron of 100:0; the dispersant is silane coupling agent KH-550; the wear-resistant agent is quartz sand; the hydrophobic agent is fluorocarbon resin; and the binder is polyurethane resin.

[0059] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0060] Magnetic material powder is added to the binder and stirred at 600 rpm for 40 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the magnetic marking coating.

[0061] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0062] Step 1: Clean the asphalt substrate. Lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 50μm.

[0063] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 2.5 mm and a width of 10 cm.

[0064] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2.5T pulsed magnetic field three times. A periodic magnetic field of 100 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10 Gauss / cm.

[0065] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 48 hours; the thickness of the UV-curing resin is 12 μm.

[0066] The performance of the magnetic markings prepared in Examples 1-3 was tested, and the results are shown in the table below.

[0067] Table 1 Performance Test Results

[0068] As shown in Table 1, this invention achieves a designable balance between magnetic properties, durability, and cost by precisely controlling the ferrite / NdFeB ratio (reaching a magnetic field of up to 500 Gauss), introducing surface coating technology (solving oxidation and corrosion), and optimizing the wear-resistant agent and resin system (improving road performance), significantly outperforming existing technologies. In particular, Example 2 (ferrite:NdFeB = 50:50 + coating) exhibits excellent comprehensive performance (high magnetic strength, excellent wear resistance, and excellent weather resistance), providing a solution for high-precision navigation scenarios. Example 4

[0069] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0070] The coating consists of 78% magnetic material powder, 3% dispersant, 7% wear-resistant agent, 2% hydrophobic agent, and 10% binder. The binder is used to adjust the viscosity of the magnetic marking paint to 1800 mPa·s.

[0071] The magnetic material powder is neodymium iron boron, i.e., the mass ratio of ferrite to neodymium iron boron is 0:100; the dispersant is silane coupling agent KH-560; the wear-resistant agent is quartz sand; the hydrophobic agent is fluorocarbon resin; and the binder is epoxy resin.

[0072] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0073] Magnetic material powder is added to the binder and stirred at 1000 rpm for 40 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the coating for magnetic marking.

[0074] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0075] Step 1: Clean the asphalt substrate. Lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 50μm.

[0076] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 0.5 mm and a width of 10 cm.

[0077] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2.5T pulsed magnetic field three times. A periodic magnetic field of 500 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 50 Gauss / cm.

[0078] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 24 hours; the thickness of the UV-curing resin is 10 μm. Example 5

[0079] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0080] The coating consists of 50% magnetic material powder, 3% dispersant, 10% wear-resistant agent, 5% hydrophobic agent, and 32% binder. The binder is used to adjust the viscosity of the magnetic marking paint to 2200 mPa·s.

[0081] The magnetic material powder is a mixture of neodymium iron boron and ferrite, with a mass ratio of ferrite to neodymium iron boron of 20:80; the dispersant is silane coupling agent KH-560; the wear-resistant agent is quartz sand; the hydrophobic agent is fluorocarbon resin; and the binder is epoxy resin.

[0082] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0083] Magnetic material powder is added to the binder and stirred at 1000 rpm for 40 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the coating for magnetic marking.

[0084] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0085] Step 1: Clean the asphalt substrate. Lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 50μm.

[0086] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 3mm and a width of 10cm.

[0087] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2.5T pulsed magnetic field three times. A periodic magnetic field of 50 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10 Gauss / cm.

[0088] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 48 hours; the thickness of the UV-curing resin is 12 μm. Example 6

[0089] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0090] The coating consists of 78% magnetic material powder, 1% dispersant, 5% wear-resistant agent, 2% hydrophobic agent, and 14% binder. The binder is used to adjust the viscosity of the magnetic marking paint to 2200 mPa·s.

[0091] The magnetic material powder is a mixture of neodymium iron boron and ferrite, with a mass ratio of ferrite to neodymium iron boron of 80:20; the dispersant is silane coupling agent KH-560; the wear-resistant agent is quartz sand; the hydrophobic agent is fluorocarbon resin; and the binder is epoxy resin.

[0092] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0093] Magnetic material powder is added to the binder and stirred at 1000 rpm for 40 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the coating for magnetic marking.

[0094] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0095] Step 1: Clean the asphalt substrate. Lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 50μm.

[0096] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 2.5 mm and a width of 10 cm.

[0097] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2.5T pulsed magnetic field three times. A periodic magnetic field of 100 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10 Gauss / cm.

[0098] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 48 hours; the thickness of the UV-curing resin is 12 μm. Example 7

[0099] A magnetic marking coating according to this embodiment comprises the following components by mass percentage:

[0100] The magnetic material powder comprises 68%, dispersant 2%, wear-resistant agent 10%, hydrophobic agent 3%, binder 17%, and solvent to adjust the viscosity of the magnetic marking paint to 1900 mPa·s.

[0101] The magnetic material powder is a ferrite mixture with an epoxy resin protective layer, i.e., the mass ratio of ferrite to neodymium iron boron is 100:0; the dispersant is silane coupling agent KH-560; the wear-resistant agent is quartz sand; the hydrophobic agent is fluorocarbon resin; and the binder is epoxy resin.

[0102] This embodiment describes a method for preparing a magnetic marking coating, comprising the following steps:

[0103] Magnetic material powder is added to epoxy resin and stirred at 1000 rpm for 40 minutes. Then, dispersant, wear-resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the magnetic marking coating.

[0104] This embodiment provides a method for preparing magnetic marking lines, comprising the following steps:

[0105] Step 1: Clean the asphalt substrate. Lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic substrate, and spray an epoxy primer with a thickness of 50μm.

[0106] Step 2: Apply the magnetic marking paint using a scraping process, with a thickness of 2.5 mm and a width of 10 cm.

[0107] Step 3: Magnetize the magnetic marking paint before it cures by applying a 2.5T pulsed magnetic field three times. A periodic magnetic field of 100 Gauss is formed by using a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10 Gauss / cm.

[0108] Step 4: After magnetization, a curing process is performed, followed by spraying UV-curing resin to obtain the magnetic marking line; the curing process is as follows: room temperature curing for 48 hours; the thickness of the UV-curing resin is 12 μm.

Claims

1. A method for preparing magnetic marking lines, characterized in that, Includes the following steps: Step 1: Clean the asphalt or concrete substrate, lay wire mesh in advance at the location where the magnetic marking paint is to be sprayed as a magnetic base, and spray epoxy primer. Step 2: Apply magnetic marking paint using a scraping or high-pressure airless spraying process. The magnetic marking paint comprises the following components by mass percentage: 50%~78% magnetic material powder, 1%~3% dispersant, 5%~10% wear-resistant agent, 2%~5% hydrophobic agent, and 10%~32% binder. The magnetic material powder is ferrite and / or neodymium iron boron, with a mass ratio of 0:100~100:

0. The binder is epoxy resin, polyurethane resin, or acrylic resin. Step 3: Magnetize the magnetic marking paint before it cures by applying a pulsed magnetic field and forming a periodic magnetic field through a multi-pole alternating magnetization fixture. Step 4: After magnetization, a curing process is performed, followed by spraying with UV-cured resin or fluorocarbon coating to obtain the magnetic marking line.

2. The method for preparing a magnetic marking line according to claim 1, characterized in that, In step 3, a pulsed magnetic field is applied, and a periodic magnetic field is formed by a multi-pole alternating magnetization fixture, specifically as follows: A pulsed magnetic field of 2-3T is applied 2-5 times to form a periodic magnetic field of 50-500 Gauss through a multi-pole alternating magnetization fixture. The magnetic field strength gradient of the periodic magnetic field is 10-50 Gauss / cm.

3. The method for preparing a magnetic marking line according to claim 1, characterized in that, The thickness of the epoxy primer in step 1 is 50~80μm; In step 2, the thickness of the paint used for the magnetic marking lines is 0.5~3mm, and the width is 10~20cm; The curing process in step 4 specifically involves: curing at room temperature for 24~48 h or heat curing at 60℃ for 1 h; the thickness of the UV-cured resin or fluorocarbon coating is 10~15μm.

4. The method for preparing a magnetic marking line according to claim 1, characterized in that, The preparation method of the magnetic marking paint includes the following steps: Magnetic material powder is added to the binder and stirred at 300-1000 rpm for 30-120 minutes. Then, dispersant, abrasion resistant agent and hydrophobic agent are added in sequence, and stirring is continued until uniform dispersion is obtained to obtain the coating for magnetic marking.

5. The method for preparing a magnetic marking line according to claim 1, characterized in that, The dispersant is silane coupling agent KH-550 or silane coupling agent KH-560; the wear-resistant agent is silicon carbide, alumina, or quartz sand; the hydrophobic agent is fluorocarbon resin or organosilicon modified resin.

6. The method for preparing a magnetic marking line according to claim 1, characterized in that, The adhesive adjusts the viscosity of the magnetic marking paint to 1800~2500 mPa·s.

7. The method for preparing a magnetic marking line according to claim 1, characterized in that, The magnetic material powder is coated with a protective layer of silicon dioxide or epoxy resin with a thickness of 0.01~2μm.

8. A magnetic mark prepared by a method for preparing a magnetic mark according to any one of claims 1 to 7.

9. The magnetic marking line according to claim 8, characterized in that, The method for restoring the magnetic properties of the magnetic markings after attenuation includes the following steps: The magnetic field strength is detected using a gaussmeter. When the magnetic field strength decreases by ≥10%, pulse magnetization is performed using a multi-pole alternating magnetization fixture.