阅读说明：本技术 一种磁性电磁散射抑制涂层材料及其制备方法与应用 (Magnetic electromagnetic scattering inhibition coating material and preparation method and application thereof ) 是由 孙新 张连平 张久霖 贺军哲 于 2021-09-29 设计创作，主要内容包括：一种磁性电磁散射抑制涂层材料的制备方法,该方法包括如下步骤：将羰基铁粉、钴粉、铁氧体和助磨剂加入球磨罐中,进行球磨处理后得到磁性电磁散射抑制剂；将磁性电磁散射抑制剂、双组份树脂、乙酸乙酯、分散剂和润湿剂进行混合搅拌,得到磁性电磁散射抑制涂层材料。本发明制得的磁性电磁散射抑制涂层材料具有优异的抑制电磁散射性能,且其厚度薄、重量轻、耐候性好,能够消除电磁散射对设备或环境造成的不利影响,起到优异的防护作用。(A preparation method of a magnetic electromagnetic scattering inhibition coating material comprises the following steps: adding carbonyl iron powder, cobalt powder, ferrite and a grinding aid into a ball milling tank, and performing ball milling treatment to obtain a magnetic electromagnetic scattering inhibitor; and mixing and stirring the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent to obtain the magnetic electromagnetic scattering inhibition coating material. The magnetic electromagnetic scattering inhibition coating material prepared by the invention has excellent electromagnetic scattering inhibition performance, is thin in thickness, light in weight and good in weather resistance, can eliminate adverse effects of electromagnetic scattering on equipment or environment, and plays an excellent protection role.)

1. A preparation method of a magnetic electromagnetic scattering inhibition coating material is characterized by comprising the following steps:

(1) adding carbonyl iron powder, cobalt powder, ferrite and a grinding aid into a ball milling tank, and performing ball milling treatment to obtain a magnetic electromagnetic scattering inhibitor;

(2) and mixing and stirring the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent to obtain the magnetic electromagnetic scattering inhibition coating material.

2. The production method according to claim 1, wherein in step (1):

the ferrite is nickel zinc ferrite;

the grinding aid is at least one selected from calcium carbonate and graphite powder; and/or

The mass ratio of the carbonyl iron powder to the cobalt powder to the ferrite to the grinding aid is (50-65): 15-20): 10-30): 3-8.

3. The production method according to claim 1, wherein in step (1):

the ball milling medium in the ball milling treatment is absolute ethyl alcohol;

the ball milling rotation speed in the ball milling treatment is 350-450 r/min;

the ball-material ratio in the ball milling treatment is (10-30) to (50-80), and the grinding balls are zirconia ceramic beads with the diameter of 5 mm;

the ball milling treatment time is 8-12 h; and/or

The particle size of the magnetic electromagnetic scattering inhibitor is 5-25 μm.

4. The method of claim 1, wherein:

in the step (1), the particle size of the carbonyl iron powder is 10-35 μm;

the particle size of the cobalt powder is 5-20 mu m;

the particle size of the ferrite is 2-10 mu m; and/or

In the step (2), the mixing and stirring time is 1-2 h.

5. The production method according to claim 1, wherein in step (2):

the mass ratio of the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent is (65-80): 5-15): 10-26: (0.5-2): 0.5-2).

6. The production method according to claim 1, wherein in step (2):

the bi-component resin is E-51 modified epoxy toughening resin;

the dispersant is at least one selected from BYK-154, BYK-163 and BYK-190; and/or

The wetting agent is at least one selected from sodium dodecyl sulfate, sodium tetradecyl sulfate and nonylphenol polyoxyethylene ether.

7. A magnetic electromagnetic scattering inhibiting coating material, characterized by:

prepared by the preparation method of any one of claims 1 to 6.

8. Use of a magnetic electromagnetic scattering inhibiting coating material obtained by the preparation method according to any one of claims 1 to 6 or a magnetic electromagnetic scattering inhibiting coating material according to claim 7, characterized in that:

spraying a magnetic electromagnetic scattering inhibition coating material on a component to be sprayed to obtain a component containing a magnetic electromagnetic scattering inhibition coating;

and sequentially carrying out air-drying treatment, curing treatment and polishing treatment on the component containing the magnetic electromagnetic scattering inhibition coating to obtain the magnetic electromagnetic scattering inhibition component.

9. Use according to claim 8, characterized in that:

the thickness of the magnetic electromagnetic scattering inhibition coating is 0.5-1.35 mm;

the temperature of the airing treatment is 25-35 ℃, the humidity is less than 75%, and the time is 50-90 min; and/or

The temperature of the curing treatment is 70-80 ℃, and the time is 2-3 h.

10. The use according to claim 8 or 9, further comprising:

spraying finish paint on the magnetic electromagnetic scattering inhibition component to obtain a magnetic electromagnetic scattering inhibition component containing the finish paint layer; wherein the thickness of the finish paint layer is 20-40 μm; and/or

The finish paint is fluorocarbon finish paint, acrylic finish paint or epoxy finish paint.

Technical Field

The invention relates to the technical field of electromagnetic functional materials, in particular to a magnetic electromagnetic scattering inhibition coating material and a preparation method and application thereof.

Background

In the free space on which humans rely for survival, electromagnetic scattering contamination due to the action of electromagnetic wave energy is ubiquitous. Electromagnetic scattering comprises two main channels of nature and human activities, and the electromagnetic scattering generated by nature is caused by basic phenomena in nature, such as cosmic rays, star impact and diffuse reflection generated on the earth surface; electromagnetic scattering from human activity is caused by electronic devices used by humans, such as from computers, cell phones, ovens, microwave ovens, stereos, and antennas. While enjoying the convenience of life brought by electromagnetic waves, people suffer from the injury caused by electromagnetic scattering pollution, and various diseases such as palpitation, chest distress, insomnia, dreaminess, hypodynamia, nerve disorder and the like are caused.

Therefore, in the background of the times when electronic equipment is not in place, how to reduce or eliminate electromagnetic scattering pollution becomes a key problem of human attention in the society nowadays, and reducing or eliminating electromagnetic scattering pollution is also a general demand of human beings in the society nowadays. The prior art mainly changes two aspects of scattering source design and loading protection isolation means to reduce or eliminate electromagnetic scattering pollution. However, the existing magnetic scattering inhibition material for loading protection isolation has the problems of complex preparation process, severe technological conditions and long preparation period.

Disclosure of Invention

The embodiment of the invention provides a magnetic electromagnetic scattering inhibition coating material, and a preparation method and application thereof.

In a first aspect, the present invention provides a method for preparing a magnetic electromagnetic scattering inhibition coating material, comprising the steps of:

(1) adding carbonyl iron powder, cobalt powder, ferrite and a grinding aid into a ball milling tank, and performing ball milling treatment to obtain a magnetic electromagnetic scattering inhibitor;

(2) and mixing and stirring the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent to obtain the magnetic electromagnetic scattering inhibition coating material.

Preferably, in step (1), the ferrite is a nickel zinc ferrite;

the grinding aid is at least one selected from calcium carbonate and graphite powder;

the mass ratio of the carbonyl iron powder to the cobalt powder to the ferrite to the grinding aid is (50-65): 15-20): 10-30): 3-8.

Preferably, in the step (1), the ball milling medium in the ball milling treatment is absolute ethyl alcohol;

the ball milling rotation speed in the ball milling treatment is 350-450 r/min;

the ball-material ratio in the ball milling treatment is (10-30) to (50-80), and the grinding balls are zirconia ceramic beads with the diameter of 5 mm;

the ball milling time is 8-12 h.

Preferably, in step (1), the particle size of the magnetic electromagnetic scattering inhibitor is 5 to 25 μm.

Preferably, in the step (1), the particle size of the carbonyl iron powder is 10-35 μm;

the particle size of the cobalt powder is 5-20 mu m;

the particle size of the ferrite is 2-10 mu m.

Preferably, in the step (2), the mixing and stirring time is 1-2 h.

Preferably, in the step (2), the mass ratio of the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersant and the wetting agent is (65-80): 5-15): 10-26): 0.5-2.

Preferably, in the step (2), the two-component resin is an E-51 modified epoxy toughening resin;

the dispersant is at least one selected from BYK-154, BYK-163 and BYK-190.

Preferably, in the step (2), the wetting agent is at least one selected from the group consisting of sodium lauryl sulfate, sodium tetradecyl sulfate and nonylphenol polyoxyethylene ether.

In a second aspect, the invention provides a magnetic electromagnetic scattering inhibition coating material, which is prepared by the preparation method of any one of the first aspect.

In a third aspect, the present invention provides a use of a magnetic electromagnetic scattering inhibition coating material, comprising the steps of:

spraying a magnetic electromagnetic scattering inhibition coating material on a component to be sprayed to obtain a component containing a magnetic electromagnetic scattering inhibition coating;

and sequentially carrying out air-drying treatment, curing treatment and polishing treatment on the component containing the magnetic electromagnetic scattering inhibition coating to obtain the magnetic electromagnetic scattering inhibition component.

Preferably, the thickness of the magnetic electromagnetic scattering inhibition coating is 0.5-1.35 mm;

the temperature of the airing treatment is 25-35 ℃, the humidity is less than 75%, and the time is 50-90 min.

Preferably, the curing treatment temperature is 70-80 ℃ and the curing treatment time is 2-3 h.

Preferably, a finishing paint is sprayed on the magnetic electromagnetic scattering inhibition component to obtain a magnetic electromagnetic scattering inhibition component containing the finishing paint layer; wherein the thickness of the finish paint layer is 20-40 μm.

Preferably, the finish paint is a fluorocarbon finish paint, an acrylic finish paint or an epoxy finish paint.

Compared with the prior art, the invention at least has the following beneficial effects:

(1) the magnetic electromagnetic scattering inhibition coating material prepared by the preparation method provided by the invention has excellent electromagnetic scattering inhibition performance, is thin in thickness, light in weight and good in weather resistance, can eliminate adverse effects of electromagnetic scattering on equipment or environment, and plays an excellent protection role.

(2) In the invention, the preparation materials required for preparing the magnetic electromagnetic scattering inhibition coating material are simple and easy to obtain, the preparation cost is low, the preparation process is simple, the operation is convenient, the magnetic electromagnetic scattering inhibition coating material can be obtained by mixing the raw materials and then carrying out ball milling treatment, and then adding the related auxiliary agents (the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent), the preparation period is short, the magnetic electromagnetic scattering inhibition coating material can be prepared at normal temperature and normal pressure, and the industrial batch production is easy to realize; in addition, the application mode of the magnetic electromagnetic scattering inhibition coating material is simple and convenient, the magnetic electromagnetic scattering inhibition coating material can be sprayed on any part needing electromagnetic scattering inhibition through a spraying system, the application range is wide, and the prepared product has reliable performance and stable quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of a method for preparing a magnetic electromagnetic scattering inhibition coating material provided by the invention;

fig. 2 is a magnetic electromagnetic scattering suppressing member provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.

As shown in fig. 1, the present invention provides a method for preparing a magnetic electromagnetic scattering inhibition coating material, which comprises the following steps:

(1) adding carbonyl iron powder, cobalt powder, ferrite and a grinding aid into a ball milling tank, and performing ball milling treatment to obtain a magnetic electromagnetic scattering inhibitor;

(2) and mixing and stirring the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent to obtain the magnetic electromagnetic scattering inhibition coating material.

Both of the steps (1) and (2) can be carried out at normal temperature and pressure.

The magnetic electromagnetic scattering inhibition coating material prepared by the preparation method provided by the invention has excellent electromagnetic scattering inhibition performance, is thin in thickness, light in weight and good in weather resistance, can eliminate adverse effects of electromagnetic scattering on equipment or environment, and plays an excellent protection role.

In the invention, the preparation materials required for preparing the magnetic electromagnetic scattering inhibition coating material are simple and easy to obtain, the preparation cost is low, the preparation process is simple, the operation is convenient, the magnetic electromagnetic scattering inhibition coating material can be obtained by mixing the raw materials and then carrying out ball milling treatment, and then adding the related auxiliary agents (the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent), the preparation period is short, the magnetic electromagnetic scattering inhibition coating material can be prepared at normal temperature and normal pressure, and the industrial batch production is easy to realize; in addition, the application mode of the magnetic electromagnetic scattering inhibition coating material is simple and convenient, the magnetic electromagnetic scattering inhibition coating material can be sprayed on any part needing electromagnetic scattering inhibition through a spraying system, the application range is wide, and the prepared product has reliable performance and stable quality.

According to some preferred embodiments, in step (1):

the ferrite is nickel zinc ferrite;

the grinding aid is at least one selected from calcium carbonate and graphite powder;

the mass ratio of the carbonyl iron powder to the cobalt powder to the ferrite to the grinding aid is (50-65): 15-20): 10-30): 3-8.

The mass ratio of the carbonyl iron powder to the cobalt powder to the ferrite to the grinding aid is (50-65): 15-20): 10-30): 3-8, namely the use amount of each raw material component in the magnetic electromagnetic scattering inhibitor is as follows: the grinding aid comprises, by weight, 50-65 parts (for example, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64 or 65) of carbonyl iron powder, 15-20 parts (for example, 15, 16, 17, 18, 19 or 20) of cobalt powder, 10-30 parts (for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30) of ferrite, and 3-8 parts (for example, 3, 4, 5, 6, 7 or 8) of grinding aid.

In the present invention, the mass ratio of carbonyl iron powder, cobalt powder, and ferrite determines the permeability and dielectric constant of the magnetic electromagnetic scattering inhibitor. The magnetic permeability of the magnetic electromagnetic scattering inhibitor prepared by the proportion is 1-3 (for example, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3), 0.5-2 of imaginary part (for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2); the dielectric constant of the magnetic electromagnetic scattering inhibitor prepared by the proportion is 5-30 (for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30) and 2-15 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15). Controlling the permeability and permittivity within the above ranges allows a large amount of electromagnetic scattering to enter the interior of the magnetic scattering suppressing coating material, so that the function of dissipating electromagnetic scattering can be further realized inside the material. If the magnetic electromagnetic scattering inhibitor is not prepared according to the mass ratio of the carbonyl iron powder, the cobalt powder and the ferrite provided by the invention, the magnetic permeability and the dielectric constant of the prepared magnetic electromagnetic scattering inhibition coating material are not in the range, so that electromagnetic scattering can not enter the material in a large amount, and the electromagnetic loss function of the material can not be realized.

According to some preferred embodiments, in step (1):

the ball milling medium in the ball milling treatment is absolute ethyl alcohol;

the ball milling speed in the ball milling treatment is 350-450r/min (for example, 350r/min, 400r/min or 450 r/min);

the ball-to-material ratio in the ball milling treatment is (10-30) to (50-80) (for example, 10:50, 10:60, 10:70, 10:80, 20:50, 20:60, 20:70, 20:80, 30:50, 30:60, 30:70 or 30:80), and the grinding balls are zirconia ceramic beads with the diameter of 5 mm;

the time of the ball milling treatment is 8-12 h (for example, 8h, 9h, 10h, 11h or 12 h).

According to some preferred embodiments, in step (1), the particle size of the magnetic electromagnetic scattering inhibitor is 5-25 μm (e.g., may be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, or 25 μm).

In the invention, the magnetic electromagnetic scattering inhibitor obtained after ball milling treatment has the advantages of uniform distribution of all components and small particle size.

According to some preferred embodiments, in the step (1), the carbonyl iron powder has a particle size of 10 to 35 μm (for example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, or 35 μm);

the particle size of the cobalt powder is 5-20 μm (for example, 5 μm, 10 μm, 15 μm or 20 μm);

the ferrite has a particle size of 2 to 10 μm (for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm);

in the step (2), the mixing and stirring time is 1-2 h (for example, 1h, 1.5h or 2 h).

It should be noted that carbonyl iron powder and cobalt powder in the magnetic electromagnetic scattering inhibitor have strong magnetism and excellent magnetic loss capability; the ferrite has small dielectric constant and excellent wave absorbing capacity; therefore, the magnetic electromagnetic scattering inhibitor obtained by mixing carbonyl iron powder, cobalt powder and ferrite has excellent wave absorbing capability and electromagnetic loss capability. In addition, carbonyl iron powder, cobalt powder and ferrite powder with small particles are selected as raw materials for preparing the coating, so that the prepared magnetic electromagnetic scattering inhibitor has small particles, and the magnetic electromagnetic scattering inhibition coating material is more compact.

According to some preferred embodiments, in step (2):

the mass ratio of the magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersing agent and the wetting agent is (65-80): 5-15): 10-26): 0.5-2.

The magnetic electromagnetic scattering inhibitor, the two-component resin, the ethyl acetate, the dispersant and the wetting agent are mixed according to the mass ratio of (65-80) to (5-15) to (10-26) to (0.5-2), namely the mass parts of the raw material components in the magnetic electromagnetic scattering inhibition coating material are as follows: the magnetic electromagnetic scattering inhibitor is 65-80 parts (for example, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79 or 80), the two-component resin is 5-15 parts (for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15), the ethyl acetate is 10-26 parts (for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or 26), the dispersant is 0.5-2 parts (for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2), and the wetting agent is 0.5-2 parts (for example, 0.5, 0.6, 0.7, 0.8, 1.5, 1.6, 1.1.1.7, 1.9, 1.2, 1.5, 1.6, 1.8, 1.9 or 2).

In the invention, the magnetic electromagnetic scattering inhibitor is diluted by adding the two-component resin (adhesive), ethyl acetate (diluent), dispersing agent and wetting agent, has excellent fluidity and adhesiveness, becomes a magnetic electromagnetic scattering inhibition coating material, and can be used as a spraying material.

It should be further noted that the mass ratio is obtained through a large number of experimental verifications, particularly the mass parts of the magnetic electromagnetic scattering inhibitor, the bi-component resin and the ethyl acetate, and if the mass parts of the magnetic electromagnetic scattering inhibitor is too low and the mass parts of the bi-component resin and the ethyl acetate are too high, the electromagnetic scattering inhibition function of the prepared magnetic electromagnetic scattering inhibition coating material is weak; if the mass parts of the magnetic electromagnetic scattering inhibitor are too high and the mass parts of the bi-component resin and the ethyl acetate are too low, the prepared magnetic electromagnetic scattering inhibition coating material has poor adhesiveness and flowability, and is not favorable for spraying and attaching the material to required equipment.

According to some preferred embodiments, in step (2):

the bi-component resin is E-51 modified epoxy toughening resin;

the dispersant is at least one selected from BYK-154, BYK-163 and BYK-190.

According to some preferred embodiments, in the step (2), the wetting agent is at least one selected from the group consisting of sodium lauryl sulfate, sodium tetradecyl sulfate, and nonylphenol polyoxyethylene ether.

According to some more preferred embodiments, the polyoxyethylene nonylphenol ether is NP-10.

The E-51 modified epoxy toughening resin enables the magnetic scattering inhibition coating material to have excellent adhesiveness, so that the magnetic scattering inhibition coating material can be better attached to a sprayed part; the magnetic scattering inhibition coating material is diluted with ethyl acetate to give the coating material excellent fluidity.

The invention provides a magnetic electromagnetic scattering inhibition coating material which is prepared by any one of the preparation methods.

The invention provides an application of a magnetic electromagnetic scattering inhibition coating material, which comprises the following steps:

spraying a magnetic electromagnetic scattering inhibition coating material on a component to be sprayed to obtain a component containing a magnetic electromagnetic scattering inhibition coating;

the part containing the magnetic electromagnetic scattering inhibition coating is subjected to air-drying treatment, curing treatment and polishing treatment in sequence to obtain the magnetic electromagnetic scattering inhibition part (shown in figure 2).

In the invention, the magnetic electromagnetic scattering inhibition coating material can coat and cover the component in a spraying mode, and after spraying, the drying treatment, the curing treatment and the polishing treatment are sequentially carried out. The whole application process of the magnetic electromagnetic scattering inhibition coating material is simple and convenient. Preferably, the spraying mode is water curtain spraying system and compressed air spray gun spraying.

According to some preferred embodiments, the magnetic electromagnetic scattering suppression coating has a thickness of 0.5 to 1.35mm (e.g., can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, or 1.35 mm);

the temperature of the air-drying treatment is 25-35 ℃ (for example, 25 ℃, 30 ℃ or 35 ℃), the humidity is less than 75%, and the time is 50-90 min (for example, 50min, 55min, 60min, 65min, 70min, 75min, 80min, 85min or 90 min);

the curing treatment temperature is 70-80 deg.C (for example, 70 deg.C, 75 deg.C or 80 deg.C), and the curing treatment time is 2-3 h (for example, 2h, 2.5h or 3 h).

In the invention, the thickness of the magnetic electromagnetic scattering inhibition coating is 0.5-1.35 mm, and the coating thickness can realize the electromagnetic scattering inhibition function in the interval, and can ensure that the coating is integrally light and thin, has small influence on the use of the component and has good coating adhesion effect; drying to volatilize ethyl acetate, dispersant and wetting agent; curing the coating to form a hard coating with a shrinkage of 0 to 10% (e.g., 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%); the polishing treatment can ensure that the surface of the coating is smooth without obvious step cracks and visible particle defects.

According to some preferred embodiments, a topcoat is sprayed onto the magnetic electromagnetic scattering inhibiting member, resulting in a magnetic electromagnetic scattering inhibiting member comprising a topcoat layer; wherein the thickness of the topcoat layer is 20 to 40 μm (for example, 20 μm, 25 μm, 30 μm, 35 μm or 40 μm).

According to some preferred embodiments, the topcoat is a fluorocarbon topcoat, an acrylic topcoat or an epoxy topcoat.

In the present invention, the finish protection treatment protects the magnetic electromagnetic scattering inhibition coating layer, thereby having excellent weather resistance.

The invention is further illustrated below with reference to specific examples. It is to be understood, however, that these examples are illustrative only and are not to be construed as limiting the scope of the present invention. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

Example 1

(1) Preparing a magnetic electromagnetic scattering inhibitor: putting carbonyl iron powder (with the particle size of 30 microns), cobalt powder (with the particle size of 6 microns), nickel-zinc ferrite (with the particle size of 5 microns) and graphite powder into a ball milling tank with the rotating speed of 380r/min according to the mass ratio of 60:18:15:3.5, carrying out ball milling treatment for 8 hours at room temperature (25 ℃), and obtaining the magnetic electromagnetic scattering inhibitor with the particle size of 13 microns after ball milling treatment. Wherein, the grinding balls subjected to ball milling treatment are zirconia ceramic beads with the diameter of 5mm, the ball milling medium is absolute ethyl alcohol, and the ball-material ratio is 30: 70.

(2) Preparing a magnetic electromagnetic scattering inhibition coating material: mixing and stirring the magnetic electromagnetic scattering inhibitor, the E-51 modified epoxy toughening resin, the ethyl acetate, the BYK-154 and the sodium dodecyl sulfate at room temperature (25 ℃) for 1h according to the mass ratio of 67:8:20:1.1:1.2 to obtain the magnetic electromagnetic scattering inhibition coating material.

(3) Application of the magnetic electromagnetic scattering inhibition coating material: spraying the magnetic electromagnetic scattering inhibition coating material onto a part to be sprayed by using a compressed air spray gun to obtain a part containing a magnetic electromagnetic scattering inhibition coating (with the thickness of 0.8 mu m); then, the component containing the magnetic electromagnetic scattering inhibition coating is subjected to sun-drying treatment for 60min in an environment with the temperature of 26 ℃ and the humidity of 60%; curing the component at 70 ℃ for 2.5h after the sun-drying treatment to obtain a magnetic electromagnetic scattering inhibition component; and finally, spraying the fluorocarbon finish paint on the magnetic electromagnetic scattering inhibition component, wherein the spraying thickness is 23 mu m.

(4) And (3) testing the magnetic electromagnetic scattering inhibition function: the electromagnetic scattering inhibition function test is carried out on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained in the embodiment, and the radar scattering cross section (RCS) reduction strength is 5dB when the component is in the X wave band and +/-30-degree azimuth angle range.

Example 2

Example 2 is essentially the same as example 1, except that:

in the step (1), the mass ratio of carbonyl iron powder, cobalt powder, nickel-zinc ferrite and graphite powder is 63:18:15: 3.5;

in the step (2), the mass ratio of the magnetic electromagnetic scattering inhibitor to the E-51 modified epoxy toughening resin to the ethyl acetate to the BYK-154 to the sodium dodecyl sulfate is 80:12:16:1: 1.

And (3) testing the magnetic electromagnetic scattering inhibition function: the electromagnetic scattering inhibition function test is carried out on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained in the embodiment, and the radar scattering cross section (RCS) reduction strength is 8dB when the component is in the X wave band and +/-30-degree azimuth angle range.

Example 3

Example 3 is essentially the same as example 1, except that:

in the step (1), the mass ratio of carbonyl iron powder, cobalt powder, nickel-zinc ferrite and graphite powder is 65:15:15: 3.5;

in the step (2), the dispersing agent is BYK-163, and the wetting agent is sodium tetradecyl sulfate;

the mass ratio of the magnetic electromagnetic scattering inhibitor to the E-51 modified epoxy toughening resin to the ethyl acetate to the BYK-163 to the sodium tetradecyl sulfate is 80:12:18:1.1: 1.

And (3) testing the magnetic electromagnetic scattering inhibition function: the electromagnetic scattering inhibition function test is carried out on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained in the embodiment, and the radar scattering cross section (RCS) reduction strength is 10dB in the X wave band and +/-30-degree azimuth angle range of the component.

Example 4

Example 4 is essentially the same as example 1, except that:

in the step (3), the curing temperature is 75 ℃, and the curing time is 2 hours;

and selecting epoxy finish paint as the finish paint.

And (3) testing the magnetic electromagnetic scattering inhibition function: the electromagnetic scattering inhibition function test of the magnetic electromagnetic scattering inhibition component containing the epoxy finish paint obtained in the embodiment is carried out, and the radar scattering cross section (RCS) reduction strength of the component in the X wave band and the azimuth angle range of +/-30 degrees is measured to be 7.5 dB.

Comparative example 1

Comparative example 1 is substantially the same as example 1 except that:

in the step (1), cobalt powder is not added into the magnetic electromagnetic inhibitor, and the mass ratio of carbonyl iron powder, nickel-zinc ferrite and graphite powder is 78:15: 3.5.

And (3) testing the magnetic electromagnetic scattering inhibition function: and (3) performing an electromagnetic scattering inhibition function test on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained by the comparative example, and measuring that the radar scattering cross section (RCS) reduction strength of the component is 1dB within an X wave band and an azimuth angle range of +/-30 degrees.

Comparative example 2

Comparative example 2 is substantially the same as example 1 except that:

in the step (1), carbonyl iron powder is not added into the magnetic electromagnetic inhibitor, and the mass ratio of the cobalt powder, the nickel-zinc ferrite and the graphite powder is 75:20: 5.

And (3) testing the magnetic electromagnetic scattering inhibition function: and (3) performing an electromagnetic scattering inhibition function test on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained by the comparative example, and measuring that the radar scattering cross section (RCS) reduction strength of the component is 0.6dB within an X wave band and an azimuth angle range of +/-30 degrees.

Comparative example 3

Comparative example 3 is substantially the same as example 1 except that:

in the step (1), the magnetic electromagnetic inhibitor is not added with nickel-zinc ferrite, and the mass ratio of the cobalt powder, the carbonyl iron powder and the graphite powder is 76:19: 5.

And (3) testing the magnetic electromagnetic scattering inhibition function: and (3) performing an electromagnetic scattering inhibition function test on the magnetic electromagnetic scattering inhibition component containing the fluorocarbon finish paint obtained by the comparative example, and measuring that the radar scattering cross section (RCS) reduction strength of the component is 0.1dB within an X wave band and an azimuth angle range of +/-30 degrees.

The radar scattering cross section (RCS) reduction test data obtained from the above-described examples 1 to 4 and comparative examples 1 to 3 in the X-band, ± 30 ° azimuth range are summarized in table 1.

TABLE 1

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention. The invention has not been described in detail and is in part known to those of skill in the art.