Resin-based coating with directionally regulated fibers and preparation method of resin-based coating

Abstract

The invention relates to a fiber directionally regulated resin-based coating and a preparation method thereof, the coating comprises a carbonyl iron powder layer and a plurality of magnetic fiber layers, the angles of the magnetic fiber layers are different, and a bionic spiral structure is formed; the carbonyl iron powder layers are sprayed among the plurality of magnetic fiber layers and between the magnetic fiber layers and the plate, or the carbonyl iron powder layers are only sprayed on the plate, or the carbonyl iron powder layers are only sprayed on the outermost magnetic fiber layer, or the carbonyl iron powder layers are only sprayed among the plurality of magnetic fiber layers. According to the invention, the composite material with a multi-scale structure is formed by combining materials with different scales, and the combination mode can fully utilize the characteristics of different materials to realize complementation and synergistic enhancement of performance. The one-dimensional nanofiber strengthening and toughening resin-based coating is prepared in a cross laying mode, the adhesive force of the resin-based coating is improved, and the method is simple in process, low in cost and suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of composite coatings, and in particular relates to a fiber-oriented resin-based coating and a preparation method thereof. Background Art

[0002] Coatings are widely used in aerospace, machinery manufacturing, automotive industry, electronics and other fields. The performance of coatings directly determines the service life and reliability of parts. Although traditional coating preparation technology can meet certain application requirements, it often has limitations when facing complex working conditions and high performance requirements.

[0003] At present, in the industrial field, the resin-based coatings on the surfaces of some products are in harsh service environments such as over-temperature, high-speed airflow erosion, thermal shock, vibration, etc. for a long time, and will gradually suffer from carbon deposition, oil accumulation, sediment coating, shedding, peeling, wear, bulging and other damages, which have a serious impact on the protective performance. Therefore, improving the adhesion of the resin-based coating, enhancing its mechanical properties, and extending its action time can reduce the erosion effects on related products and improve product reliability. Summary of the invention

[0004] The present invention provides a fiber orientation-controlled resin-based coating 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 present invention provides a resin-based coating with fiber orientation control, characterized in that the coating includes a carbonyl iron powder layer and a plurality of magnetic fiber layers, and the angle of each magnetic fiber layer is different to form a bionic spiral structure; the carbonyl iron powder layer is sprayed between the plurality of magnetic fiber layers and between the magnetic fiber layer 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 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.

[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 method for preparing the resin-based coating with fiber orientation control, characterized in that it comprises the following steps:

[0010] S1, preparing a carbonyl iron powder layer slurry, and spraying the carbonyl iron powder layer slurry on a surface at a desired position to form a carbonyl iron powder layer;

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

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

[0013] The resin is one of epoxy resin, silicone resin, phenolic resin or methylphenyl polysilicone resin.

[0014] The angle of the magnetic fiber layer is regulated by the NS 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 0.3-1 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°.

[0016] 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.

[0017] The magnetic fiber layer is prepared by 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.

[0018] Beneficial effects: By regulating the interaction between the layers, the mechanical properties of the coating can be further enhanced. By combining materials of different scales to form a composite material with a multi-scale structure, this combination method can make full use of the characteristics of different materials to achieve complementary and synergistic performance enhancement. The present invention adopts a cross-layering method to prepare a one-dimensional nanofiber toughened resin-based coating to improve the adhesion of the resin-based coating. The present invention has a simple process and low cost and is suitable for industrial production.

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

[0020] 2. The present invention intersperses magnetic fiber layers of different angles between carbonyl iron powder layers, and adopts a combination of brushing and spraying to form a bionic spiral structure. Compared with the conventional direct spraying method, the present invention has higher adhesion.

[0021] 3. The present invention does not use expensive precious metals, etc., the raw materials are cheap and widely available, the preparation process is simple, and the coating cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 (a), (b), and (c) are schematic diagrams of 0°, 45°, and 90° coating.

[0023] Figure 2 Schematic diagram of resin-based coating for fiber orientation control

[0024] Figure 3 Schematic diagram of a special tool for preparing a fiber layer of the present invention. DETAILED DESCRIPTION

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

[0026] The present invention proposes a fiber orientation-controlled resin-based coating, wherein the plying sequence includes the following:

[0027] ① Spraying carbonyl iron powder slurry on the plate, and then preparing three consecutive magnetic fiber layers to form a bottom layer, a middle layer, and a surface layer of magnetic fiber layers;

[0028] ② Spraying of carbonyl iron powder layer slurry of the board - preparation of bottom fiber layer - spraying of carbonyl iron powder layer slurry - preparation of middle fiber layer - spraying of carbonyl iron powder layer slurry - preparation of surface fiber layer;

[0029] That is, multiple layers of carbonyl iron powder are sprayed on the outside of the board, and magnetic fiber layers are interspersed between the carbonyl iron powder layers. Each magnetic fiber layer adopts a different angle to form a bionic spiral structure.

[0030] ③ Directly prepare three layers of magnetic fiber on the board, including the bottom layer, the middle layer and the surface layer, and finally spray the carbonyl iron powder layer slurry;

[0031] ④Prepare the bottom fiber layer on the board - spray the carbonyl iron powder layer slurry - prepare the middle fiber layer - spray the carbonyl iron powder layer slurry - prepare the surface fiber layer - spray the carbonyl iron powder layer slurry.

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

[0033] A method for preparing a fiber-oriented resin-based coating comprises the following steps:

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

[0035] S1.1. The carbonyl iron powder layer slurry comprises: carbonyl iron powder (20-100 g), resin (10-100 g), curing agent (10-50 g), and solvent (3-50 g).

[0036] In step S1.1, the resin is one of epoxy resin, silicone resin, phenolic resin, and methylphenyl polysilicone resin.

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

[0038] S1.2, using a homogenizer to mix the above ingredients uniformly, the dispersion speed is 500-5000r / min, the stirring time is 15-60min, and a slurry is obtained;

[0039] S2, Carbonyl iron powder slurry spraying

[0040] S2.1. Use sandpaper to polish the surface of the board until smooth and then clean it with ethanol.

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

[0042] S2.3. After spraying, place the workpiece in an oven for curing. The curing temperature is 50-150°C and the curing time is 30-500 minutes.

[0043] S3. Preparation of magnetic fiber layer slurry

[0044] S3.1. The fiber layer slurry composition includes: carbonyl iron powder (20-100g), resin (10-100g), curing agent (10-50g), magnetic fiber (0.5-30g), solvent (3-50g), and may not include carbonyl iron powder.

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

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

[0047] S3.2. Use a homogenizer to stir and mix the above fiber layer slurry evenly. The dispersion speed is 1000-10000r / min and the stirring time is 15-60min.

[0048] S4. Preparation of magnetic fiber layer

[0049] S4.1. Place the workpiece into the slot of the special tool, and pour the fiber layer slurry from step S3 into the special tool from the feed port;

[0050] The special tool includes a slot plate and a pressing plate placed on the slot plate. The pressing plate is installed in the frame and can move up and down. The slot plate is used to place the workpiece. The pressing plate is located above the plate and there is a gap. A feeding port is provided 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 slot plate and the workpiece;

[0052] You can also directly apply the magnetic fiber layer;

[0053] S4.3. Place the fiber-layered board on a magnetic tray and use the magnetism of the tray to change the direction of the fibers within a range of 0°-90°.

[0054] S4.4. Place the workpiece in an oven for curing at a temperature of 50-150°C and a curing time of 100-500 minutes.

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

[0056] Example 1

[0057] The steps for preparing the resin-based coating for fiber orientation control are as follows:

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

[0059] 2) The mixed solution was stirred and mixed uniformly using a homogenizer at a dispersing speed of 5000 r / min and a stirring time of 15 min.

[0060] 3) Use sandpaper to polish the surface of the board and clean it with ethanol.

[0061] 4) The coating was sprayed by air spraying. The air compressor pressure value during spraying was 0.75 MPa, the distance between the spray gun and the workpiece surface was 20 cm, the angle between the spray gun and the workpiece surface was 45°, and a carbonyl iron powder layer was obtained by spraying.

[0062] 5) After spraying, place the workpiece in an oven for curing at a temperature of 50°C and a curing time of 1 hour.

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

[0064] 7) The mixed solution was stirred and mixed uniformly using a homogenizer at a dispersing speed of 5000 r / min and a stirring time of 15 min.

[0065] 8) Place the plate from step 5) into the slot of the special tool, and pour the slurry from step 7) into the inlet of the special tool, 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 slot plate and the plate;

[0066] 9) Place the fiber-layered sheet on a magnetic tray with the NS pole direction of the magnetic tray at 0°, so that the direction of the fiber is consistent with the NS pole direction of the tray;

[0067] 10) After preparation, place the workpiece in an oven for curing at a temperature of 50°C and a curing time of 1 hour.

[0068] 11) Repeat steps 1) to 10) with the NS pole direction of the magnetic tray at 45°.

[0069] 12) Repeat steps 1) to 10) with the NS polar orientation of the magnetic tray being 90°.

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

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

[0072] Example 2

[0073] The steps for preparing the resin-based coating for fiber orientation control 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) The mixed solution was stirred and mixed uniformly using a homogenizer at a dispersing speed of 1000 r / min and a stirring time of 15 min.

[0076] 3) Use sandpaper to polish the surface of the board and clean it with ethanol.

[0077] 4) The coating was sprayed by air spraying. The air compressor pressure value range during spraying was 0.75 MPa, the distance between the spray gun and the workpiece surface was 20 cm, the angle between the spray gun and the workpiece surface was 45°, and a carbonyl iron powder layer was obtained by spraying.

[0078] 5) After spraying, place the workpiece in an oven for curing at a temperature of 120°C and a curing time of 30 minutes.

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

[0080] 7) The mixed slurry was stirred and mixed uniformly using a homogenizer at a dispersing speed of 1000 r / min and a stirring time of 15 min.

[0081] 8) Place the plate from step 5) into the slot of the special tool, and pour the slurry from step 7) into the inlet of the special tool, 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 slot plate and the plate;

[0082] 9) Place the fiber-layered sheet on a magnetic tray with the NS pole direction of the magnetic tray at 0°, so that the direction of the fiber is consistent with the NS pole direction of the tray;

[0083] 10) After preparation, the workpiece is placed in an oven for curing at a temperature of 120°C and a curing time of 30 minutes.

[0084] 11) On the coated surface of step 10), repeat steps 8) to 10) with the NS pole direction of the magnetic tray being 45°;

[0085] 12) On the coated surface of step 11), repeat steps 8) to 10) with the NS pole direction of the magnetic tray being 90°;

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

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fiber orientation controlled resin-based coating, characterized in that: The coating includes a carbonyl iron powder layer and multiple magnetic fiber layers, and each magnetic fiber layer has a different angle to form 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, 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 multiple magnetic fiber layers.

2. The fiber orientation controlled resin-based coating according to claim 1, characterized in that: The angle of the magnetic fiber layer ranges from 0° to 90°.

3. The fiber orientation controlled resin-based coating according to claim 1, characterized in that: 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.

4. The fiber orientation controlled resin-based coating according to claim 1, characterized in that: The carbonyl iron powder layer is prepared by air compression spraying technology, and the magnetic fiber layer is prepared by brushing method.

5. A method for preparing a resin-based coating with fiber orientation control according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, preparing a carbonyl iron powder layer slurry, and spraying the carbonyl iron powder layer slurry on a surface at a desired position to form a carbonyl iron powder layer; S2, preparing a magnetic fiber layer slurry, coating the magnetic fiber layer slurry on the surface at a desired position, and adjusting the fiber direction by a magnetic tray to form magnetic fiber layers at different angles; S3, repeating steps S1 to S2 to form a structure of alternating multiple carbonyl iron powder layers and magnetic fiber layers.

6. The preparation method according to claim 5, characterized in that: The resin is one of epoxy resin, silicone resin, phenolic resin or methylphenyl polysilicone resin.

7. The preparation method according to claim 5, characterized in that: The angle of the magnetic fiber layer is regulated by the NS pole direction of the magnetic tray, and the angle range is 0° to 90°.

8. The preparation method according to claim 5, 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°.

9. The preparation method according to claim 5, 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.

10. The preparation method according to claim 5, characterized in that: The magnetic fiber layer is prepared by 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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