A magnetic regulation-based coating material, its preparation method and application

Abstract

This invention discloses a magnetically controlled coating, its preparation method, and its application, relating to the field of coating technology. The magnetically controlled coating of this invention comprises component A and component B. Component A includes epoxy-modified polyurethane resin, magnetic wear-resistant filler, extender filler, dispersant, and solvent A. The magnetic wear-resistant filler includes at least two types of magnetic wear-resistant fillers with different particle sizes. The magnetic wear-resistant filler includes magnetic wear-resistant filler A and magnetic wear-resistant filler B, with magnetic wear-resistant filler A having an average particle size of 40-60 μm and magnetic wear-resistant filler B having an average particle size of 90-120 μm. Component B includes a curing agent and solvent B. The weight ratio of component A to component B is (5-6):1. This invention can form a high-density, skeletally supported concentrated distribution on the coating surface, achieving high surface wear resistance; the bottom coating, due to the reduced filler content, can form high toughness.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically, to a magnetically controlled coating, its preparation method, and its application. Background Technology

[0002] In the industrial sector, parts such as the undersides of high-speed trains and automobiles, and wind turbine blades, have long been plagued by the impact and wear of sand and raindrops. Especially in complex and harsh environments, wear not only causes damage and corrosion to the equipment surface, increases maintenance frequency, and shortens service life, but may also lead to equipment failure, resulting in economic losses and safety hazards.

[0003] Coating technology, as an economical and efficient surface protection strategy, has always attracted much attention in solving wear problems. Traditional sand and rain erosion resistant coatings typically involve simply mixing wear-resistant fillers into a resin base, relying on the inherent wear-resistant properties of the fillers to improve the overall wear resistance of the coating. However, existing sand and rain erosion resistant coatings generally suffer from excessive filler content. This not only directly leads to a significant decrease in the coating's flexibility and adhesion but also significantly increases its density and weight, further increasing energy consumption. Simultaneously, the use of large amounts of powder also drives up the overall preparation cost of the coating. Chinese patent CN101003701B discloses a wear-resistant coating that allows magnetic particles to exhibit a concentration gradient distribution under the action of a magnetic field, reducing the amount of filler particles added, but it does not fundamentally solve the problem of excessive filler content. Furthermore, sand and rain erosion resistant coatings often face alternating high and low temperature environments, and the coating must also possess good flexibility to match the linear expansion coefficient of the substrate to achieve good adhesion. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a magnetically controlled coating, its preparation method, and its application. This invention addresses the lack of effective control over the distribution of wear-resistant fillers in traditional sand and rain erosion resistant coatings, resulting in large filler additions and poor coating toughness and deformation resistance. It provides a magnetically controlled, self-layering, low-density, high-toughness sand and rain erosion resistant coating. By using a magnetic or magnetizable dual-size filler during the coating curing process, the magnetic field overcomes the effects of Brownian motion and van der Waals forces, forming a high-density, "skeleton-supported" concentrated distribution on the coating surface, thus achieving high surface wear resistance. Simultaneously, the bottom layer, due to the reduced filler content, exhibits high toughness. Compared to traditional coatings, this coating has lower cost and higher resistance to sand and rain erosion, thus meeting the growing demand of modern industry for high-performance, high-quality wear-resistant protective coatings.

[0005] One of the objectives of this invention is to provide a coating based on magnetic control.

[0006] The magnetically controlled coating of the present invention comprises component A and component B; Component A includes epoxy-modified polyurethane resin, magnetic wear-resistant filler, extender filler, dispersant, and solvent A; The magnetic wear-resistant filler includes at least two types of magnetic wear-resistant fillers with different particle sizes; Component B includes a curing agent and solvent B; The weight ratio of component A to component B is (5~6):1, preferably (5.5~5.7):1.

[0007] In a preferred embodiment of the present invention: The magnetic wear-resistant filler is ferrite; preferably barium ferrite and / or strontium ferrite; more preferably, The magnetic wear-resistant filler includes magnetic wear-resistant filler A and magnetic wear-resistant filler B; the average particle size of magnetic wear-resistant filler A is 40~60μm, preferably 45~55μm; and / or, the average particle size of magnetic wear-resistant filler B is 90~120μm, preferably 100~110μm.

[0008] In a preferred embodiment of the present invention: The magnetic wear-resistant filler A is a hollow glass microsphere coated with ferrite. Preferably, the ferrite shell of the hollow glass microsphere is 1~3μm. Specifically, barium ferrite-coated hollow glass microspheres from Xinghua Hongyang Glass Products Co., Ltd. can be used, with a shell layer of 1~3μm and a remanence of 0.3T~0.4T; or strontium ferrite-coated hollow glass microspheres from Ningbo Teli Technology Co., Ltd. can be used, with a shell layer of 1~3μm and a remanence of 0.32T~0.38T.

[0009] In a preferred embodiment of the present invention: In component A, based on 100 parts by weight of epoxy-modified polyurethane resin: 100 parts by weight of epoxy-modified polyurethane resin; Magnetic wear-resistant filler A3~20 parts by weight; Magnetic wear-resistant filler B2~15 parts by weight; 10-30 parts by weight of filler material; Dispersant 0.3~3 parts by weight; Solvent A: 15-30 parts by weight; In component B, based on 100 parts by weight of curing agent: 100 parts by weight of curing agent; Solvent B: 40-60 parts by weight.

[0010] In a preferred embodiment of the present invention: In component A, based on 100 parts by weight of epoxy-modified polyurethane resin: 100 parts by weight of epoxy-modified polyurethane resin; Magnetic wear-resistant filler A: 8~15 parts by weight; Magnetic wear-resistant filler B4~10 parts by weight; 15-25 parts by weight of extender filler; Dispersant 0.5~2 parts by weight; Solvent A: 18-25 parts by weight; In component B, based on 100 parts by weight of curing agent: 100 parts by weight of curing agent; Solvent B: 45-55 parts by weight.

[0011] In a preferred embodiment of the present invention: The epoxy-modified polyurethane resin is a mixture of epoxy resin and polyurethane, preferably, The weight ratio of epoxy resin to polyurethane is (0.1~1):1, preferably (0.2~0.45):1; and / or, The epoxy resin is a bisphenol A epoxy resin (such as resin 618, resin 6101, resin 634, etc.) and / or a hydrogenated bisphenol A epoxy resin; and / or, The polyurethane is a polyether-type polyurethane, such as Huatian H2125A / H2122A, Covestro UE-85AU10, Lubrizol 58237, etc.; and / or, The filler material is at least one selected from quartz powder, talc powder, mica powder, and calcium carbonate; and / or, The dispersant is a commonly used dispersant in the art, such as dispersant HCP-163, dispersant W-108, dispersant SL-163, etc., preferably dispersant HCP-163; and / or, Solvent A is at least one of xylene, heavy aromatics, and cyclohexanone; and / or... The curing agent is an amine compound, more preferably a polyamide compound, such as polyamide 650, polyamide 651, etc.; and / or, Solvent B is at least one of xylene, heavy aromatics, and cyclohexanone.

[0012] A second objective of this invention is to provide a method for preparing a magnetically controlled coating as described in one objective of this invention.

[0013] The method for preparing a magnetically controlled coating according to the present invention includes: Component A is prepared by mixing the raw materials of component A; component B is prepared by mixing the raw materials of component B; and the coating is prepared by mixing component A and component B in the specified proportion.

[0014] The following solutions can be adopted: Step 1: Weigh each raw material component according to the weight proportions, add the epoxy modified polyurethane resin to the mixing container, turn on the stirring (speed about 500~800 r / min), slowly add the amount of solvent A in the formula, stir for 5~10 min until the resin is completely dissolved and a uniform resin solution is formed. Step 2: Under stirring (maintain 500~800r / min), first add the dispersant and stir for 2~3min; then add the magnetic wear-resistant filler and the extender filler in sequence, and continue stirring for 10~15min to initially disperse the filler. Step 3: Increase the stirring speed to 1000~1500 r / min and continue to disperse for 20~30 min until there are no obvious particle agglomerations in the system and a uniform and fine slurry is formed (the dispersion effect can be checked through a 400 mesh sieve to ensure no or very little sieve residue). Discharge the material to obtain component A. Step 4: Add the curing agent to the mixing container, and slowly add solvent B while stirring (300~500 r / min). Stir for 5~8 minutes until completely mixed and homogeneous, then discharge the material to obtain component B. Step 5: Weigh component A and component B according to the weight ratio, and mix them evenly to obtain the finished coating.

[0015] A third objective of this invention is to provide an application of a magnetically controlled coating as described in one objective of this invention, or a magnetically controlled coating prepared by the method described in another objective of this invention, in the fields of high-speed rail (e.g., the bottom of a high-speed rail), automobiles (e.g., the bottom of a automobile), and wind turbine blades.

[0016] In a preferred embodiment of the present invention, the application includes: The coating is applied to the surface of the object to be coated, and before the coating is fully cured, the coating is magnetically treated using an external magnetic field.

[0017] In a preferred embodiment of the present invention: The coating is applied by spraying and / or brushing; and / or, The applied magnetic field strength for the magnetic treatment is 500~2000 Gauss, and / or the distance is 4~28cm, and / or the temperature is 15℃~40℃, and / or the time is 2~48h.

[0018] The following solutions can be adopted: Step A: For the metal surfaces of the load-bearing beams and bogie connecting seats, first use sandblasting (quartz sand, particle size 0.1~0.3mm, sandblasting pressure 0.6~0.8MPa) to remove surface oxide scale and rust, and enhance coating adhesion. For the slender structure of the pipeline support and the bolt holes and welded joints of the bogie connecting seats, wipe the surface oil stains with alcohol, and then use compressed air (pressure 0.3~0.5MPa) to blow away the dust in the gaps to avoid impurities affecting the coating bonding.

[0019] Step B, lower surface of the load-bearing beam and outer surface of the protective cover plate: high-pressure airless spraying (spraying pressure 0.3~0.6MPa, nozzle diameter 1~2mm, spraying distance 20~40cm, spray gun moving speed 30~60cm / s), coating thickness controlled at 150~200μm; surface of pipe support and around bolt holes of bogie connecting seat: brushing combined with local spraying, when brushing, ensure that the paint fills the gaps (depth ≥0.5mm), coating thickness after spraying controlled at 100~150μm, to avoid excessive coating thickness causing bolt hole blockage; Before the coating is fully cured, the coating is magnetically treated using an external magnetic field; the external magnetic field strength is 500~2000 Gauss, the action distance is 4~28cm, the temperature is 15℃~40℃, and the action time is 2~48h.

[0020] Magnetic fields, as a special physical field, exhibit great potential in the microstructural control and distribution of materials. This invention, by introducing a magnetic field induction mechanism into coatings, addresses the problem of poor coating toughness caused by the large amount of functional fillers added in traditional sand-erosion-resistant and anti-corrosion coatings. This invention achieves both high wear resistance and high toughness in the coating surface by rationally designing parameters such as the strength, direction, and duration of the magnetic field, thus improving the coating's performance. Furthermore, this invention utilizes magnetic dual-size fillers to overcome the effects of Brownian motion and van der Waals forces during the coating curing process, forming a high-density, skeletally supported concentrated distribution on the coating surface, achieving high surface wear resistance. The bottom coating, with its reduced filler content, exhibits high toughness, resulting in lower costs and higher resistance to sand and rain erosion compared to traditional coatings.

[0021] The beneficial effects of this invention are that it utilizes dual-size magnetic wear-resistant particles, avoiding the problems of surface resin exposure in the early stages of wear caused by the large gaps between large-size particles alone, or the need for higher addition amounts to form a continuous wear-resistant layer when using small-size particles alone. Due to the introduction of polyurethane resin and the reduction of fillers in the coating's underlayer, the coating's underlayer exhibits higher toughness, effectively buffering the impact of sand and raindrops, achieving a synergistic performance of "surface wear resistance + underlayer toughness." The "skeleton structure" formed by the large-size particles in the lower layer provides stable support for the small-size particles on the surface, preventing the wear-resistant filler from indenting and deforming into the coating under friction and impact pressure, ultimately leading to resin exposure and wear damage.

[0022] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships, such as A and / or B. Specifically, it can mean that A and B can be included at the same time, A can exist alone, or B can exist alone, and any of the above three situations can be met. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the raw material components of the coatings in Examples 1-5 of the present invention; Figure 2 These are schematic diagrams of the coatings of Examples 1-5 of the present invention under the action of an external magnetic field; Figure 3 These are schematic diagrams of the coatings in Examples 1-5 of the present invention after being subjected to an external magnetic field; Among them, 1-a body filler, 2-ferrite-coated hollow glass microspheres; 3-magnetic wear-resistant filler B. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0025] In the embodiments and comparative examples of this invention, the raw materials are all commercially available products.

[0026]

Example 1

[0027] Table 1

[0028] The epoxy-modified polyurethane resin is obtained by mixing bisphenol A epoxy resin (resin 618) and polyether polyurethane (Huatian H2125A) in a weight ratio of 0.3:1.

[0029] Add epoxy-modified polyurethane resin to a mixing container, add xylene while stirring at 500 rpm, and stir for 5 minutes until dissolved; maintain 500 rpm, add dispersant HCP-163, stir for 2 minutes, then add barium ferrite, strontium ferrite, quartz powder, and talc powder in sequence, and stir for 12 minutes; increase the speed to 1200 rpm, disperse for 25 minutes, and check through a 400-mesh sieve for no obvious residue, then discharge to obtain coating component A; add polyamide to a mixing container, stir at 500 rpm, slowly add cyclohexanone, stir for 5 minutes, and discharge to obtain coating component B; weigh components A and B according to the weight ratio, mix evenly, and obtain the finished coating.

[0030] High-pressure airless spraying: pressure 0.35Mpa, distance 25cm, nozzle diameter 1.3mm, spray gun moving speed 40cm / s, sprayed on pre-treated steel surface; A 1000 Gauss magnetic field was applied vertically to the sprayed coating at a distance of 10 cm, at a room temperature of 25 ± 2 °C, for 30 hours.

[0031]

Example 2

[0032] Table 2

[0033] The epoxy-modified polyurethane resin is obtained by mixing bisphenol A epoxy resin (resin 6101) and polyether polyurethane (Huatian H2122A) in a weight ratio of 0.25:1.

[0034] Heavy aromatic hydrocarbons are added to epoxy-modified polyurethane resin and stirred at 600 rpm for 6 minutes until dissolved. Dispersant HCP-163 is added and stirred at 550 rpm for 3 minutes. Strontium ferrite, mica powder, and calcium carbonate are then added and stirred for 10 minutes. The stirring speed is increased to 1000 rpm and the mixture is dispersed for 30 minutes. After passing the inspection with a 400-mesh sieve, the mixture is discharged to obtain coating component A. Polyamide is added to a stirring container and stirred at 400 rpm. Cyclohexanone is added slowly and stirred for 6 minutes. The mixture is then discharged to obtain coating component B. Components A and B are weighed according to their weight ratio and mixed evenly to obtain the finished coating.

[0035] Air spraying: pressure 0.5MPa, distance 32cm, nozzle diameter 1.3mm, spray gun moving speed 50cm / s, sprayed on pretreated steel; A vertical magnetic field of 1500 Gauss was applied to the sprayed coating at a distance of 15cm, at a room temperature of 25℃±2℃, for 8 hours.

[0036]

Example 3

[0037] Table 3

[0038] The epoxy-modified polyurethane resin is obtained by mixing bisphenol A epoxy resin (resin 634) and polyether polyurethane (Covestro UE-85AU10) in a weight ratio of 0.35:1.

[0039] Heavy aromatic hydrocarbons are added to epoxy-modified polyurethane resin and stirred at 700 rpm for 5 minutes until dissolved. Dispersant HCP-163 is added and stirred at 600 rpm for 2 minutes. Strontium ferrite, barium ferrite, and talc are then added and stirred for 15 minutes. The stirring speed is increased to 1500 rpm and the mixture is dispersed for 20 minutes. After passing the inspection with a 400-mesh sieve, the mixture is discharged to obtain coating component A. Polyamide is added to a stirring container and stirred at 300 rpm. Xylene is added slowly and stirred for 8 minutes. The mixture is then discharged to obtain coating component B. Components A and B are weighed according to their weight ratio and mixed evenly to obtain the finished coating.

[0040] Application method of paint: High-pressure airless spraying, pressure 0.35MPa, nozzle diameter 1.3mm, distance 25cm, moving speed 35cm / s, sprayed on pre-treated steel; A vertical magnetic field of 2000 Gauss was applied to the sprayed coating at a distance of 20cm, at a room temperature of 25℃±2℃, for 2 hours.

[0041]

Example 4

[0042] Table 4

[0043] The epoxy-modified polyurethane resin is obtained by mixing bisphenol A epoxy resin (resin 618) and polyether polyurethane (Huatian H2125A) in a weight ratio of 0.3:1.

[0044] A mixed solvent of heavy aromatics, xylene, and cyclohexanone was added to the epoxy-modified polyurethane resin and stirred at 550 rpm for 10 min until dissolved. Dispersant SL-163 was added and stirred at 500 rpm for 3 min. Strontium ferrite, quartz powder, and mica powder were then added and stirred for 12 min. The stirring speed was increased to 1300 rpm and the mixture was dispersed for 28 min. After passing the inspection with a 400-mesh sieve, the mixture was discharged to obtain coating component A. Polyamide was added to a stirring container and stirred at 300 rpm. Xylene was added slowly and stirred for 8 min. The mixture was then discharged to obtain coating component B. Components A and B were weighed according to their weight ratio and mixed evenly to obtain the finished coating.

[0045] Application method of paint: Air spraying, pressure 0.6MPa, distance 40cm, nozzle diameter 1.3mm, moving speed 60cm / s, spraying on pretreated steel; A vertical magnetic field of 800 Gauss was applied to the sprayed coating at a distance of 8 cm, at a room temperature of 25℃±2℃, for 36 hours.

[0046]

Example 5

[0047] Table 5

[0048] The epoxy-modified polyurethane resin is obtained by mixing bisphenol A epoxy resin (resin 6101) and polyether polyurethane (Huatian H2122A) in a weight ratio of 0.25:1.

[0049] Coating preparation method: A mixed solvent of heavy aromatics and xylene is added to epoxy-modified polyurethane resin and stirred at 800 rpm for 7 minutes until dissolved. Dispersant HCP-163 is added, and the mixture is stirred at 700 rpm for 2 minutes. Then, barium ferrite and calcium carbonate are added and stirred for 14 minutes. The stirring speed is increased to 1400 rpm, and the mixture is dispersed for 22 minutes. After passing inspection through a 400-mesh sieve, the mixture is discharged to obtain coating component A. Polyamide is added to a stirring container at 350 rpm, and xylene is slowly added and stirred for 7 minutes. The mixture is then discharged to obtain coating component B. Components A and B are weighed according to their weight ratio and mixed thoroughly to obtain the finished coating.

[0050] Application method of paint: Spraying parameters: pressure 0.45MPa, distance 35cm, nozzle diameter 1.3mm, moving speed 45cm / s, sprayed on pretreated steel; A 500 Gauss magnetic field was applied vertically to the sprayed coating at a distance of 4 cm, at a room temperature of 25℃±2℃, for 48 hours.

[0051] Comparative Example 1 The coating preparation and application methods of this comparative example are the same as those of Example 2, except that strontium ferrite coating of hollow glass microspheres and strontium ferrite were not added.

[0052] Comparative Example 2 The coating preparation and application methods in this comparative example are the same as those in Example 3, except that no magnetic field is applied during application, while the other application parameters are the same.

[0053] Comparative Example 3 The coating preparation and application methods of this comparative example are the same as those of Example 1. The difference is that 50 parts by weight of barium ferrite-coated hollow glass microspheres and 20 parts by weight of strontium ferrite are added, and no magnetic field is applied during application.

[0054] Comparative Example 4 The coating preparation and application methods of this comparative example are the same as those of Example 2, except that 25 parts by weight of strontium ferrite-coated hollow glass microspheres and 10 parts by weight of strontium ferrite are added.

[0055] The coatings prepared in the above embodiments and comparative examples were subjected to performance tests. The flexibility was tested according to GB / T1731-2020, the adhesion according to GB / T9286-2021, the abrasion resistance according to GB / T1768-2006, the impact resistance according to GB / T1732-2020, and the density according to GB / T9272-2007. The specific test results are shown in Table 6.

[0056] Table 6

[0057] As shown in Table 6, Examples 1-5 provide a coating with excellent overall performance. In Examples 1-4, the amount of magnetic wear-resistant filler added was relatively small, and the adhesion reached grade 0, indicating that the coatings all had good adhesion. In Example 5, the amount of magnetic wear-resistant filler added increased, and the adhesion was grade 1, indicating a slight decrease in coating adhesion, but it still met the application requirements. Simultaneously, with a smaller filler content, the coating had a lower density while still possessing good high wear resistance and high impact resistance. The above examples illustrate that through the synergistic effect of magnetic wear-resistant filler and magnetic field control, excellent performance and balance of "high wear resistance + high toughness" with low filler content are achieved.

[0058] The difference between Comparative Example 1 and Example 2 is that the hollow glass microspheres and strontium ferrite coated with strontium ferrite are not included. All other conditions are exactly the same, but the performance difference is significant. Among them, the wear resistance increased sharply from 13mg to 52mg, and the wear amount increased by 3 times, indicating that the wear-resistant filler can significantly improve the coating's resistance to sand and rain erosion. Its absence will cause the coating to lose its wear resistance.

[0059] The difference between Comparative Example 2 and Example 3 lies in the absence of a magnetic field. In Comparative Example 2, the adhesion decreased from level 0 to level 2, while the abrasion resistance increased from 13 mg to 45 mg. This is because, without a magnetic field, the magnetic filler cannot migrate directionally and accumulate on the coating surface; instead, it disperses randomly, weakening the abrasion resistance of the coating surface. The random distribution and natural sedimentation of the magnetic abrasion-resistant filler disrupt the continuity of the coating resin matrix, weakening the bond between the coating and the substrate. In contrast, Example 3, under the control of an external magnetic field, achieved controllable filler distribution and optimized coating performance.

[0060] In Comparative Example 3, without applying a magnetic field, the amount of magnetic wear-resistant filler was increased from 12 parts by weight to 70 parts by weight to achieve the same wear resistance as in Example 1. This resulted in a significant decrease in the coating's flexibility, adhesion, and impact resistance, as well as a significant increase in density. In this case, the magnetic wear-resistant filler was relatively uniformly and extensively filled throughout the coating. However, the excessive rigid filler weakened the continuity of the resin matrix, reduced flexibility, weakened the bond between the coating and the substrate, decreased impact resistance, and significantly increased density.

[0061] The difference between Comparative Example 4 and Example 2 is that the amount of magnetic filler increased from 18 parts by weight to 35 parts by weight, resulting in a decrease in coating flexibility from 1 mm to 4 mm and an increase in adhesion from grade 0 to grade 2. This is because excessive rigid filler disrupts the continuity of the resin matrix, increases brittleness, and weakens the bonding force between the coating and the substrate. The impact resistance dropped sharply from 50 cm to 30 cm, with a significant increase in brittleness, while the abrasion resistance increased from 13 mg to 28 mg. This demonstrates that the present invention can achieve excellent coating performance by adding a small amount of abrasion-resistant filler.

[0062] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its scope and spirit, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A coating based on magnetic modulation, characterized in that... The coating comprises component A and component B; Component A includes epoxy-modified polyurethane resin, magnetic wear-resistant filler, extender filler, dispersant, and solvent A; The magnetic wear-resistant filler includes at least two types of magnetic wear-resistant fillers with different particle sizes; The magnetic wear-resistant filler includes magnetic wear-resistant filler A and magnetic wear-resistant filler B, wherein the average particle size of magnetic wear-resistant filler A is 40~60μm and the average particle size of magnetic wear-resistant filler B is 90~120μm; Component B includes a curing agent and solvent B; The weight ratio of component A to component B is (5~6):

1.

2. The coating according to claim 1, characterized in that: The weight ratio of component A to component B is (5.5~5.7):1; and / or, The magnetic wear-resistant filler is ferrite; and / or, The epoxy-modified polyurethane resin is a mixture of epoxy resin and polyurethane; and / or, The filler material is at least one selected from quartz powder, talc powder, mica powder, and calcium carbonate; and / or, Solvent A is at least one of xylene, heavy aromatics, and cyclohexanone; and / or... The curing agent is an amine compound; and / or, Solvent B is at least one of xylene, heavy aromatics, and cyclohexanone.

3. The coating according to claim 2, characterized in that: The magnetic wear-resistant filler is barium ferrite and / or strontium ferrite; and / or, The weight ratio of epoxy resin to polyurethane is (0.1~1):1; and / or, The epoxy resin is bisphenol A epoxy resin and / or hydrogenated bisphenol A epoxy resin; and / or... The polyurethane is a polyether-type polyurethane; and / or, The curing agent is a polyamide compound.

4. The coating according to claim 3, characterized in that: The magnetic wear-resistant filler A has an average particle size of 45~55μm, and / or the magnetic wear-resistant filler B has an average particle size of 100~110μm; and / or The magnetic wear-resistant filler A is a hollow glass microsphere coated with ferrite, wherein the ferrite shell of the hollow glass microsphere is 1~3μm; and / or, The weight ratio of epoxy resin to polyurethane is (0.2~0.45):

1.

5. The coating according to claim 3, characterized in that: In component A, based on 100 parts by weight of epoxy-modified polyurethane resin: 100 parts by weight of epoxy-modified polyurethane resin; Magnetic wear-resistant filler A3~20 parts by weight; Magnetic wear-resistant filler B2~15 parts by weight; 10-30 parts by weight of filler material; Dispersant 0.3~3 parts by weight; Solvent A: 15-30 parts by weight; In component B, based on 100 parts by weight of curing agent: 100 parts by weight of curing agent; Solvent B: 40-60 parts by weight.

6. The coating according to claim 5, characterized in that: In component A, based on 100 parts by weight of epoxy-modified polyurethane resin: 100 parts by weight of epoxy-modified polyurethane resin; Magnetic wear-resistant filler A: 8~15 parts by weight; Magnetic wear-resistant filler B4~10 parts by weight; 15-25 parts by weight of extender filler; Dispersant 0.5~2 parts by weight; Solvent A: 18-25 parts by weight; In component B, based on 100 parts by weight of curing agent: 100 parts by weight of curing agent; Solvent B: 45-55 parts by weight.

7. A method for preparing a magnetically controlled coating as described in any one of claims 1 to 6, characterized in that... The method includes: Component A is prepared by mixing the raw materials of component A; component B is prepared by mixing the raw materials of component B; and the coating is prepared by mixing component A and component B.

8. The application of a magnetically controlled coating as described in any one of claims 1 to 6, or a magnetically controlled coating prepared by the method described in claim 7, characterized in that... The coating is used in high-speed rail, automobile, and wind turbine blade applications.

9. The application according to claim 8, characterized in that... The applications include: The coating is applied to the surface of the object to be coated, and before the coating is fully cured, the coating is magnetically treated using an external magnetic field.

10. The application according to claim 9, characterized in that: The coating is applied by spraying and / or brushing; and / or, The applied magnetic field strength for the magnetic treatment is 500~2000 Gauss, and / or the distance is 4~28cm, and / or the temperature is room temperature, and / or the time is 2~48h.

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