Resin-based coating with fiber orientation control and method of making

Abstract

The present application relates to a kind of resin-based coating of fiber orientation regulation and its preparation method, the coating includes carbonyl iron powder layer and multilayer magnetic fiber layer, and the angle of each layer magnetic fiber layer is different, forms bionic helical structure;The carbonyl iron powder layer is sprayed between multilayer magnetic fiber layer and between magnetic fiber layer and plate, or the carbonyl iron powder layer is only sprayed on plate, or the carbonyl iron powder layer is only sprayed on the outermost magnetic fiber layer, or the carbonyl iron powder layer is only sprayed between multilayer magnetic fiber layer.The present application is combined by different scale materials, forms composite material with multi-scale structure, and this combination can make full use of the characteristics of different materials, realize the complementation and synergistic enhancement of performance.The present application prepares one-dimensional nanofiber toughening structure resin-based coating by the way of cross-laying, improves the adhesion of resin-based coating, and the present application is simple in process, low in cost, and suitable for industrial production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite coatings, and particularly relates to a resin-based coating with directional regulation of fibers and a preparation method thereof. BACKGROUND

[0002] Coatings are widely used in the fields of aerospace, mechanical manufacturing, automobile industry, electronics, etc., and the performance thereof directly determines the service life and reliability of parts. Although traditional coating preparation techniques can meet certain application requirements, they often have limitations when facing complex working conditions and high performance requirements.

[0003] At present, in the industrial field, resin-based coatings on the surface of some products are gradually damaged, such as carbon deposition, oil deposition, sediment coating, peeling, peeling, wear and bulging, in the harsh service environment of long-term over-temperature, high-speed airflow erosion, thermal shock and vibration, which seriously affects the protective performance. Therefore, improving the adhesion of the resin-based coating, enhancing the mechanical properties thereof and prolonging the action time thereof can reduce the erosion impact on the related products and improve the reliability of the products. SUMMARY

[0004] The application provides a resin-based coating with directional regulation of fibers and a preparation method thereof, so that the prepared resin-based coating has excellent adhesion performance.

[0005] In order to solve the above technical problems, the application provides a resin-based coating with directional regulation of fibers, characterized in that the coating comprises a carbonyl iron powder layer and a plurality of magnetic fiber layers, and the angles of each magnetic fiber layer are different, forming a biomimetic spiral structure; the carbonyl iron powder layer is sprayed between the plurality of magnetic fiber layers and between the magnetic fiber layers and the plate, or the carbonyl iron powder layer is only sprayed on the plate, or the carbonyl iron powder layer is only sprayed on the outermost magnetic fiber layer, or the carbonyl iron powder layer is only sprayed between the plurality of magnetic fiber layers.

[0006] The angle of the magnetic fiber layer ranges from 0° to 90°.

[0007] The magnetic fiber layer comprises ferrite fibers or carbonyl iron fibers, and the average particle size of the magnetic fibers is 0.1-0.4 μm, and the aspect ratio is greater than or equal to 1000.

[0008] The carbonyl iron powder layer is prepared by air compression spraying technology, and the magnetic fiber layer is prepared by brushing method.

[0009] A preparation method of the resin-based coating with directional regulation of fibers, characterized by comprising the following steps:

[0010] S1, a carbonyl iron powder layer slurry is prepared, and the carbonyl iron powder layer slurry is sprayed on the surface of the required position to form a carbonyl iron powder layer;

[0011] S2, preparing a magnetic fiber layer slurry, coating the magnetic fiber layer slurry on a surface at a desired position, and regulating the fiber direction through a magnetic tray to form a magnetic fiber layer with different angles;

[0012] S3, repeating steps S1 to S2 to form a structure with multiple layers of carbonyl iron powder layers and magnetic fiber layers alternately.

[0013] The resin is one of an epoxy resin, a silicone resin, a phenolic resin, or a methylphenyl polysiloxane resin.

[0014] The angle of the magnetic fiber layer is regulated by the N-S pole direction of the magnetic tray, and the angle range is 0° to 90°.

[0015] The spraying pressure of the carbonyl iron powder layer slurry is 0.3-1MPa, the distance between the spray gun and the surface of the workpiece is 15-25cm, and the included angle between the spray gun and the surface of the workpiece is 45°.

[0016] The curing temperature of the carbonyl iron powder layer is 50-150℃, the curing time is 30-500 minutes, the curing temperature of the magnetic fiber layer is 50-150℃, and the curing time is 100-500 minutes.

[0017] The preparation of the magnetic fiber layer uses a special tool, which includes a clamping groove plate and a pressing plate, and the pressing plate can move up and down to uniformly coat the slurry on the surface of the plate.

[0018] Beneficial effects: By regulating the interfacial interaction between layers, the mechanical properties of the coating can be further enhanced. By combining materials of different sizes, a composite material with a multi-scale structure is formed. This combination method can fully utilize the characteristics of different materials, achieve performance complementation and synergistic enhancement. The present application uses a cross-laying method to prepare a one-dimensional nanofiber toughening resin-based coating, which improves the adhesion of the resin-based coating. The process is simple, low in cost, and suitable for industrial production.

[0019] 1. The carbonyl iron powder layer of the present application is prepared by air compression spraying technology, and the coating has good densification; the magnetic fiber layer is prepared by brushing method, and the process is simple and easy to operate.

[0020] 2. The present application inserts magnetic fiber layers with different angles between the carbonyl iron powder layers, and forms a bionic spiral structure by combining brushing and spraying. Compared with the usual direct spraying method, the present application has higher adhesion.

[0021] 3. The present application does not use expensive noble metals, and the raw material price is low and the source is wide. Moreover, the preparation process is simple, and the coating cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 (a) (b) (c) are respectively 0°, 45°, 90° coating layer schematic diagram

[0023] Figure 2 Resin-based coating layer for fiber orientation control schematic diagram

[0024] Figure 3 Special tool for preparing fiber layer of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, content and advantages of the present application more clear, the specific embodiments of the present application are described in further detail below.

[0026] The present application provides a resin-based coating layer for fiber orientation control, and the layering sequence includes the following:

[0027] ① The carbonyl iron powder layer slurry is sprayed on the plate, and then three continuous magnetic fiber layers are prepared to form the bottom layer, middle layer and surface layer of the magnetic fiber layer;

[0028] ② The carbonyl iron powder layer slurry is sprayed on the plate, and then three continuous magnetic fiber layers are prepared to form the bottom layer, middle layer and surface layer of the magnetic fiber layer;

[0029] That is, the plate is sprayed with multiple layers of carbonyl iron powder layer, and the magnetic fiber layer is inserted between the carbonyl iron powder layers, and each layer of the magnetic fiber layer adopts a different angle to form a biomimetic spiral structure.

[0030] ③ Three layers of magnetic fiber layer are directly prepared on the plate, including the bottom layer, middle layer and surface layer, and then the carbonyl iron powder layer slurry is sprayed;

[0031] ④ The bottom layer of the fiber layer is prepared on the plate, and then the carbonyl iron powder layer slurry is sprayed, and then the middle layer of the fiber layer is prepared, and then the carbonyl iron powder layer slurry is sprayed, and then the surface layer of the fiber layer is prepared, and then the carbonyl iron powder layer slurry is sprayed.

[0032] The angle of the magnetic fiber layer is prepared from 0 degrees to 90 degrees, including three layers of magnetic fiber layer, and the carbonyl iron powder layer can be one layer or multiple layers.

[0033] A resin-based coating layer preparation method for fiber orientation control includes the following steps:

[0034] S1, preparation of carbonyl iron powder layer slurry, the specific steps are as follows:

[0035] S1.1, the composition of the carbonyl iron powder layer slurry includes: carbonyl iron powder (20-100g), resin (10-100g), curing agent (10-50g), solvent (3-50g).

[0036] The resin in step S1.1 is one of an epoxy resin, a silicone resin, a phenolic resin, and a methylphenyl polysiloxane resin.

[0037] The solvent in step S1.1 is ethanol, acetone, xylene, or a mixed solvent of any two thereof.

[0038] S1.2, the above ingredients are uniformly mixed by using a homogenizing disperser, the dispersion rotation speed is 500-5000 r / min, and the stirring time is 15-60 min, to obtain a slurry;

[0039] S2, the carbonyl iron powder layer slurry is sprayed

[0040] S2.1, the plate is polished smooth by using sandpaper and cleaned with ethanol.

[0041] S2.2, the air pressure machine pressure value range is 0.3-1 MPa during spraying, the distance between the spray gun and the workpiece surface is 15-25 cm, the included angle between the spray gun and the workpiece surface is 45°, and the carbonyl iron powder layer is obtained by spraying.

[0042] S2.3, after the spraying is completed, the workpiece is placed in an oven for curing, the curing temperature is 50-150 ℃, and the curing time is 30-500 min.

[0043] S3, preparation of a magnetic fiber layer slurry

[0044] S3.1, the fiber layer slurry ingredients include: carbonyl iron powder (20-100 g), resin (10-100 g), curing agent (10-50 g), magnetic fiber (0.5-30 g), and solvent (3-50 g), and the carbonyl iron powder can also be excluded.

[0045] The magnetic fiber in step S3.1 is ferrite fiber or carbonyl iron fiber.

[0046] The average particle size of the magnetic fiber in step S3.1 is 0.1-0.4 μm, and the aspect ratio is ≥1000.

[0047] S3.2, the above fiber layer slurry is uniformly mixed by using a homogenizing disperser, the dispersion rotation speed is 1000-10000 r / min, and the stirring time is 15-60 min.

[0048] S4, preparation of a magnetic fiber layer

[0049] S4.1, the workpiece is placed in a clamping groove of a special tool, and the fiber layer slurry of step S3 is poured into the special tool from a feeding port of the special tool.

[0050] The special tool includes a clamping groove plate and a pressing plate placed on the clamping groove plate, the pressing plate is installed in a frame and can move up and down, the clamping groove plate is used for placing the workpiece, the pressing plate is located above the plate and has a gap, and the feeding port is arranged on the pressing plate.

[0051] S4.2, slowly press the pressing plate of the special tool downward to ensure that the slurry contacts the surface of the plate, and then pull out the clamping groove plate and the workpiece;

[0052] The magnetic fiber layer can also be directly brushed on;

[0053] S4.3, place the plate with the laid fiber layer on the magnetic tray, and change the direction of the fiber by the magnetism of the tray, the range of the direction being 0°-90°;

[0054] S4.4, place the workpiece in the oven for curing, the curing temperature being 50-150℃, and the curing time being 100-500 minutes.

[0055] S4.5, repeat the above steps to obtain the magnetic fiber layer of the required number of layers.

[0056] Example 1

[0057] The preparation steps of the resin-based coating with fiber orientation control are as follows:

[0058] 1) mix 100g of carbonyl iron powder, 100g of epoxy resin, 30g of curing agent, and 30g of xylene solvent.

[0059] 2) use a homogenizing disperser to stir and mix the above mixed solution uniformly, the dispersion rotation speed being 5000r / min, and the stirring time being 15min.

[0060] 3) use sandpaper to polish the plate to be smooth, and clean it with ethanol.

[0061] 4) use air spraying method to spray the coating, the air pressure machine pressure value being 0.75Mpa during spraying, the distance between the spray gun and the surface of the workpiece being 20cm, and the included angle between the spray gun and the surface of the workpiece being 45°, to obtain the carbonyl iron powder layer.

[0062] 5) after spraying, place the workpiece in the oven for curing, the curing temperature being 50℃, and the curing time being 1h.

[0063] 6) mix 100g of epoxy resin, 30g of curing agent, 15g of carbonyl iron fiber, and 30g of xylene solvent.

[0064] 7) use a homogenizing disperser to stir and mix the above mixed solution uniformly, the dispersion rotation speed being 5000r / min, and the stirring time being 15min.

[0065] 8) place the plate of step 5) into the special tool clamping groove, pour the slurry of step 7) from the special tool inlet, slowly press the pressing plate of the special tool downward to ensure that the slurry contacts the surface of the plate, and then pull out the clamping groove plate and the plate;

[0066] 9) Put the fiber layer on the plate to the magnetic tray, the N-S pole direction of the magnetic tray is 0°, and the direction of the fiber is consistent with the N-S pole direction of the tray;

[0067] 10) After preparation, put the workpiece into the oven for curing, the curing temperature is 50°C, and the curing time is 1 h.

[0068] 11) Repeat steps 1) to 10), and the N-S pole direction of the magnetic tray is 45°.

[0069] 12) Repeat steps 1) to 10), and the N-S pole direction of the magnetic tray is 90°.

[0070] 13) A fiber orientation controlled resin-based coating is prepared.

[0071] The adhesion of the fiber orientation controlled resin-based coating prepared in this embodiment is tested, and the value can reach 12 MPa.

[0072] Example 2

[0073] The preparation steps of the fiber orientation controlled resin-based coating are as follows:

[0074] 1) Mix 70 g of carbonyl iron powder, 70 g of epoxy resin, 20 g of curing agent, and 20 g of xylene solvent.

[0075] 2) Stir the above mixture solution uniformly using a homogenizing disperser, the dispersion speed is 1000 r / min, and the stirring time is 15 min.

[0076] 3) Use sandpaper to polish the plate to smooth, and clean it with ethanol.

[0077] 4) Use air spraying method for coating spraying, the air pressure machine pressure value range is 0.75 Mpa during spraying, the distance between the spray gun and the workpiece surface is 20 cm, the included angle between the spray gun and the workpiece surface is 45°, and the carbonyl iron powder layer is obtained by spraying.

[0078] 5) After spraying, put the workpiece into the oven for curing, the curing temperature is 120°C, and the curing time is 30 min.

[0079] 6) Mix 70 g of carbonyl iron powder, 70 g of epoxy resin, 20 g of curing agent, and 15 g of ferrite fiber, and 20 g of xylene solvent.

[0080] 7) Stir the above mixture slurry uniformly using a homogenizing disperser, the dispersion speed is 1000 r / min, and the stirring time is 15 min.

[0081] 8) Put the plate of step 5) into the special tool slot, pour the slurry of step 7) from the special tool inlet, slowly press the special tool presser down to ensure the slurry contacts the plate surface, then pull out the slot plate and the plate;

[0082] 9) Put the plate with fiber layer on the magnetic tray, the N-S direction of the magnetic tray is 0°, so that the fiber direction is consistent with the N-S direction of the tray;

[0083] 10) After preparation, put the workpiece into the oven for curing, the curing temperature is 120℃, and the curing time is 30 min.

[0084] 11) On the surface of the coating of step 10), repeat steps 8) to 10), the N-S direction of the magnetic tray is 45°;

[0085] 12) On the surface of the coating of step 11), repeat steps 8) to 10), the N-S direction of the magnetic tray is 90°;

[0086] The adhesion of the fiber orientation controlled resin-based coating prepared in the embodiment is tested, and the value can reach 10 MPa.

[0087] The above is only the preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the technical principles of the present application, several improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A resin-based coating with fiber orientation control, characterized in that: The coating comprises a carbonyl iron powder layer and multiple magnetic fiber layers, and each magnetic fiber layer has a different angle, forming a bionic spiral structure; the carbonyl iron powder layer is sprayed between the multiple magnetic fiber layers and between the magnetic fiber layer and the plate; The angle of the magnetic fiber layer ranges from 0° to 90°; The magnetic fiber layer includes ferrite fibers or carbonyl iron fibers, and the average particle size of the magnetic fibers is 0.1-0.4 μm, and the aspect ratio is ≥1000; The carbonyl iron powder layer is prepared by air compression spraying technology, and the magnetic fiber layer is prepared by brushing method.

2. A method for preparing a resin-based coating with fiber orientation control according to claim 1, characterized in that: The following steps are involved: S1. Prepare a carbonyl iron powder layer slurry, and spray the carbonyl iron powder layer slurry on the surface of a desired position to form a carbonyl iron powder layer; S2. Prepare a magnetic fiber layer slurry, apply the magnetic fiber layer slurry to the surface at the desired location, and adjust the fiber direction by a magnetic tray to form magnetic fiber layers with different angles; S3. Repeat steps S1 to S2 to form a structure of alternating carbonyl iron powder layers and magnetic fiber layers.

3. The preparation method according to claim 2, characterized in that The resin is one of epoxy resin, silicone resin, phenolic resin or methylphenyl polysilicone resin.

4. The preparation method according to claim 2, characterized in that The angle of the magnetic fiber layer is controlled by the NS pole direction of the magnetic tray, and the angle range is 0° to 90°.

5. The preparation method according to claim 2, characterized in that The spraying pressure of the carbonyl iron powder layer slurry is 0.3-1 MPa, the distance between the spray gun and the workpiece surface is 15-25 cm, and the angle between the spray gun and the workpiece surface is 45°.

6. The preparation method according to claim 2, characterized in that The curing temperature of the carbonyl iron powder layer is 50-150° C., and the curing time is 30-500 minutes. The curing temperature of the magnetic fiber layer is 50-150° C., and the curing time is 100-500 minutes.

7. The preparation method according to claim 2, characterized in that The magnetic fiber layer is prepared using a special tool, which includes a slot plate and a pressing plate. The pressing plate can move up and down to evenly coat the slurry on the surface of the plate.

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