A wave absorbing structure based on tape laying process and its preparation method

Abstract

The present invention provides an absorbing structure based on a tape laying process and a preparation method thereof, belonging to the technical field of absorbing materials. The preparation method comprises: S1. feeding a fiber tape into an absorbing slurry for impregnation, rolling it, and drying it to obtain an absorbing prepreg tape; S2. winding and laying a transparent prepreg tape, the absorbing prepreg tape, and a carbon fiber prepreg tape to obtain a prepreg tape after laying; S3. curing and molding the prepreg tape after laying to obtain an absorbing structure. The absorbing structure obtained by the preparation method of the absorbing structure provided by the present invention is an integrated absorbing structure with a complete and uniform structure, good surface quality, and excellent absorbing effect. It can take into account both load-bearing and scattering characteristics, and solves the problems of coating cracking and shedding easily occurring in the absorbing structure of traditional absorbing rotating body components, wrinkling and delamination of the absorbing prepreg, and decreased absorbing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of wave-absorbing materials, and in particular to a wave-absorbing structure based on a tape laying process and a preparation method thereof. Background Art

[0002] At present, for cylindrical components such as cabin sections, nozzles, and air inlets, the method of winding composite material prepreg tapes and then spraying absorbing coatings or laying absorbing prepregs is usually adopted to meet their low scattering characteristics requirements. However, spraying absorbing coatings is prone to quality problems such as cracking and falling off. At the same time, the internal space of some rotating components is limited, which makes the spraying process difficult. In addition, the absorbing coating has a limited frequency coverage and cannot meet the requirements of broadband low-scattering characteristic control of components. Laying absorbing prepregs can be co-cured with prepregs, which to a certain extent makes up for the shortcomings of absorbing coatings. However, absorbing prepregs are more sensitive to the laying process, and components are prone to wrinkling, delamination, reduced absorbing performance, and other problems. At the same time, uneven laying of absorbing prepregs can also cause changes in internal stiffness and strength, affecting the service life of components. Summary of the Invention

[0003] In response to one or more technical problems existing in the prior art, the present invention provides an absorbing structure based on a tape laying process and a preparation method thereof. The absorbing structure prepared by the preparation method of the absorbing structure provided by the present invention is an integrated absorbing structure with a complete and uniform structure, good surface quality, and excellent absorbing effect. It can take into account both load-bearing and scattering characteristics, and solves the problems of coating cracking and falling off easily in the absorbing structure of traditional absorbing rotating body components, wrinkling and delamination of absorbing prepregs, and decreased absorbing performance.

[0004] In a first aspect, the present invention provides a method for preparing an absorbing structure based on a tape laying process, the method comprising:

[0005] S1. The fiber tape is impregnated into the absorbing slurry, pressed by rollers, and dried to obtain an absorbing prepreg;

[0006] S2. The wave-transmitting prepreg, the wave-absorbing prepreg and the carbon fiber prepreg are wound and laid to obtain a prepreg after laying; the wave-transmitting prepreg is a glass fiber prepreg, a quartz fiber prepreg and an aramid fiber prepreg;

[0007] S3. Curing and molding the prepreg tape after layering to obtain an absorbing structure.

[0008] Preferably, the fiber used in the fiber belt is one or more of glass fiber, quartz fiber, and aramid fiber.

[0009] Preferably, the width of the fiber tape is 9 to 50 mm; and / or

[0010] The tension of the fiber belt is 60-100N.

[0011] Preferably, the absorbing slurry comprises an absorbent, a resin and an additive; the absorbent accounts for 2 to 20 wt % of the absorbing slurry.

[0012] Preferably, the absorbent is a dielectric absorbent, preferably one or more of carbon black, graphene, carbon nanotubes, and silicon carbide;

[0013] The resin is one or more of polyurethane resin, medium-temperature epoxy resin and polyimide resin; and / or

[0014] The auxiliary agents include diluents, anti-settling agents and dispersants.

[0015] Preferably, the wave-transmitting prepreg tape, the wave-absorbing prepreg tape and the carbon fiber prepreg tape use the same resin system.

[0016] Preferably, the traveling speed of the fiber tape during the impregnation process is 1-2 m / min.

[0017] Preferably, the roller distance during the pressing process is 0.02 to 0.06 mm greater than the thickness of the fiber strip.

[0018] Preferably, the drying temperature is lower than the curing temperature of the resin system.

[0019] Preferably, the prepreg tape after laying includes an inner layer formed by laying the wave-transmitting prepreg tape, an intermediate layer formed by laying the wave-absorbing prepreg tape, and an outer layer formed by laying the carbon fiber prepreg tape; or

[0020] The prepreg tape after laying includes an inner layer formed by laying the wave-transmitting prepreg tape, a middle layer formed by alternately laying the wave-absorbing prepreg tape and the wave-transmitting prepreg, and an outer layer formed by laying the carbon fiber prepreg tape.

[0021] In a second aspect, the present invention provides a wave absorbing structure based on a tape laying process, which is manufactured using the manufacturing method described in the first aspect.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The present invention first impregnates the fiber tape with an absorbing slurry, then controls the amount of absorbing slurry retained in the prepreg by a pressure roller, and then dries the solvent in the prepreg to obtain an absorbing prepreg. Finally, the transparent prepreg, the absorbing prepreg and the carbon fiber prepreg are wound and laid, and the prepreg after laying is cured and formed to obtain an absorbing structure. The present invention prepares the absorbing prepreg in advance and directly lays the absorbing prepreg together with the transparent prepreg and the carbon fiber prepreg by a winding and laying method. After the laying is completed, the absorbing prepreg is cured and formed to obtain an integrated absorbing structure. The absorbing structure obtained by this preparation method is an integrated absorbing structure with a complete and uniform structure, good surface quality, and excellent absorbing effect. It can take into account both load-bearing and scattering characteristics, and solves the problems of the traditional absorbing rotating body component absorbing structure prone to coating cracking and shedding, wrinkling and delamination of the absorbing prepreg, and reduced absorbing performance. At the same time, the laying scheme can be designed according to performance requirements, providing a universal solution for the preparation of composite absorbing structures of different rotating cylinders, which can be used for the processing and manufacturing of cylinder-type components with the same type of low scattering feature control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a flow chart of a method for preparing an absorbing structure based on a tape laying process provided by the present invention;

[0026] Figure 2 Schematic diagram of the preparation process of the wave-absorbing prepreg provided by the present invention;

[0027] Figure 3 This is a physical diagram of the simulated metal state of the absorbing structure based on the tape laying process provided in Example 1 of the present invention;

[0028] Figure 4 3. This is a comparison diagram of the absorbing performance of the absorbing structure based on the tape laying process provided in Example 1 of the present invention in a simulated metal state and a simulated absorbing state;

[0029] Figure 5 This is a physical diagram of the simulated absorbing state of the absorbing structure based on the tape laying process provided in Example 1 of the present invention;

[0030] Figure 6 This is a comparison chart of the absorbing performance of the absorbing structure provided in Comparative Example 1 of the present invention in a simulated metal state and a simulated absorbing state;

[0031] Figure 7 3. This is a comparison diagram of the absorbing performance of the absorbing structure provided in Comparative Example 2 of the present invention in a simulated metal state and a simulated absorbing state;

[0032] Figure 8 This is a comparison chart of the absorbing performance of the absorbing structure provided in Comparative Example 3 of the present invention in a simulated metal state and a simulated absorbing state. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In a first aspect, the present invention provides a method for preparing an absorbing structure based on a tape laying process, the method comprising:

[0035] S1. The fiber tape is impregnated into the absorbing slurry, pressed by rollers, and dried to obtain an absorbing prepreg;

[0036] S2. The wave-transmitting prepreg, the wave-absorbing prepreg and the carbon fiber prepreg are wound and laid to obtain a prepreg after laying; the wave-transmitting prepreg is a glass fiber prepreg, a quartz fiber prepreg and an aramid fiber prepreg;

[0037] S3. Curing and molding the prepreg tape after layering to obtain an absorbing structure.

[0038] The present invention first impregnates the fiber tape with absorbing slurry, then controls the amount of absorbing slurry retained in the prepreg tape by a pressing roller, and then dries the solvent in the prepreg tape to obtain an absorbing prepreg tape. Finally, the wave-transmitting prepreg tape, the absorbing prepreg tape and the carbon fiber prepreg tape are layered, and the layered prepreg tapes are cured and formed to obtain an absorbing structure.

[0039] The present invention prepares absorbing prepregs in advance and directly lays the absorbing prepregs together with the wave-transmitting prepregs and carbon fiber prepregs by winding and laying. After the laying is completed, the absorbing prepregs are cured and formed to obtain an integrated absorbing structure. The absorbing structure prepared by this preparation method is an integrated absorbing structure with a complete and uniform structure, good surface quality, and excellent absorbing effect. It can take into account both load-bearing and scattering characteristics, and solves the problems of coating cracking and shedding, wrinkling and delamination of absorbing prepregs, and reduced absorbing performance in traditional absorbing rotary body component absorbing structures. At the same time, the laying scheme (including the thickness of the laying layer, the number of layers, the fiber type and resin system of the prepreg, etc.) can be designed according to performance requirements, providing a universal solution for the preparation of composite absorbing structures of different rotary cylinders, which can be used for the processing and manufacturing of cylindrical components with the same type of low scattering characteristic control requirements.

[0040] The sources of the wave-transmitting prepreg and the carbon fiber prepreg of the present invention are not specifically limited. The wave-transmitting prepreg and the carbon fiber prepreg can be obtained by impregnating the fiber tape with a resin matrix, or can be purchased directly.

[0041] According to some preferred embodiments, the preparation method of the fiber band includes: arranging the fiber filaments and adjusting the tension to obtain the fiber band; specifically: placing the roller of the fiber filaments into the yarn rack according to the requirements of the fiber band width, arranging the yarn through the grate so that the fibers are arranged in parallel, the width of the fiber band is 9 to 50 mm, and the tension of the fiber band is adjusted to 60 to 100 N.

[0042] According to some preferred embodiments, the fibers used in the fiber tape are one or more of glass fibers, quartz fibers, and aramid fibers.

[0043] According to some preferred embodiments, the width of the fiber tape is 9 to 50 mm (for example, 9 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm).

[0044] According to some preferred embodiments, the tension of the fiber tape is 60-100 N (for example, 60 N, 65 N, 70 N, 75 N, 80 N, 85 N, 90 N, 95 N or 100 N). The present invention regulates the tension of the fiber tape to ensure better laying of the fiber tape.

[0045] According to some preferred embodiments, the absorbing slurry includes an absorbent, a resin and an additive; the absorbent accounts for 2 to 20 wt% (for example, 2 wt%, 5 wt%, 10 wt%, 15 wt% or 20 wt%) in the absorbing slurry.

[0046] According to some preferred embodiments, the absorbent is a dielectric absorbent, preferably one or more of carbon black, graphene, carbon nanotubes, and silicon carbide;

[0047] According to some preferred embodiments, the resin is one or more of polyurethane resin, medium temperature epoxy resin and polyimide resin. The resin types of the present invention are not limited to the above types, and other resins can be selected according to the temperature resistance requirements of the components used.

[0048] According to some preferred embodiments, the auxiliary agent includes a diluent, an anti-settling agent and a dispersant.

[0049] According to some preferred embodiments, the wave-transmitting prepreg tape, the wave-absorbing prepreg tape and the carbon fiber prepreg tape use the same resin system.

[0050] According to some preferred embodiments, the traveling speed of the fiber tape during the impregnation process is 1 to 2 m / min (for example, 1 m / min, 1.2 m / min, 1.4 m / min, 1.6 m / min, 1.8 m / min or 2 m / min); in order to ensure that the fiber tape is fully impregnated, the traveling speed of the fiber tape when feeding into the absorbing slurry is preferably within the above range.

[0051] According to some preferred embodiments, the roller pitch during the pressing process is 0.02 to 0.06 mm (e.g., 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, or 0.06 mm) greater than the thickness of the fiber tape. To ensure the absorbing performance of the prepreg, the impregnated fiber tape is introduced into the squeezing rollers, and the roller pitch is controlled to regulate the amount of absorbing slurry retained in the prepreg.

[0052] According to some preferred embodiments, the drying temperature is lower than the curing temperature of the resin system. The fiber strip after the pressing roller is fed into a drying device (e.g., a drying tunnel, but not limited to a drying tunnel) where the drying temperature is controlled to be lower than the curing temperature of the resin, ensuring that the solvent is evaporated while the resin does not solidify.

[0053] According to some preferred embodiments, the prepreg tape after laying includes an inner layer obtained by laying the wave-transmitting prepreg tape, an intermediate layer obtained by laying the wave-absorbing prepreg tape, and an outer layer obtained by laying the carbon fiber prepreg tape; or

[0054] The prepreg tape after laying includes an inner layer formed by laying the wave-transmitting prepreg tape, a middle layer formed by alternately laying the wave-absorbing prepreg tape and the wave-transmitting prepreg tape, and an outer layer formed by laying the carbon fiber prepreg tape.

[0055] It should be noted that the mold used in the layup process is the same size as the component used in the absorbing structure. The thickness of each layer can be determined based on the component's electrical and mechanical performance requirements and can be adjusted as needed. After layup, curing and molding are carried out according to the curing conditions of the resin system in the prepreg tape. The prepreg tape and mold are placed in an oven or autoclave, and the appropriate pressure is applied. The temperature is raised to the curing temperature at a controlled rate and maintained at this temperature. After cooling naturally, the pressure is released and the mold is removed to obtain the absorbing structure.

[0056] In a second aspect, the present invention provides a wave absorbing structure based on a tape laying process, which is manufactured using the manufacturing method described in the first aspect.

[0057] In order to more clearly illustrate the technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the examples. The present invention does not specifically limit the sources of the reagents used in the examples and comparative examples, and they can be directly purchased or synthesized.

[0058] Example 1

[0059] A method for preparing an absorbing structure based on a tape laying process comprises the following steps:

[0060] Preparation of microwave absorbing prepreg:

[0061] Weigh 500g of carbon black, 4250g of medium-temperature epoxy resin, 2000g of ethyl acetate, 100g of British BOK anti-settling agent T-999, and 150g of dispersant F-503, and stir thoroughly at 800r / min for 30min to obtain 1# absorbing slurry;

[0062] Weigh 500g of carbon black, 5550g of medium-temperature epoxy resin, 2000g of ethyl acetate, 100g of British BOK anti-settling agent T-999, and 150g of dispersant F-503, and stir thoroughly at 800r / min for 30min to obtain 2# absorbing slurry;

[0063] Weigh 500g of carbon black, 7580g of medium-temperature epoxy resin, 2000g of ethyl acetate, 100g of British BOK anti-settling agent T-999, and 150g of dispersant F-503, and stir thoroughly at 800r / min for 30min to obtain 3# absorbing slurry;

[0064] Weigh 500g of carbon black, 11750g of medium-temperature epoxy resin, 2000g of ethyl acetate, 100g of British BOK anti-settling agent T-999, and 150g of dispersant F-503, stir thoroughly at 800r / min for 30min to obtain 4# absorbing slurry.

[0065] Preparation of fiber tape: Place the glass fiber yarn into the creel according to the requirements of the fiber tape width, and use the grate to arrange the yarn so that the fibers are arranged in parallel. A glass fiber tape with a width of 20 mm and a thickness of 0.18 mm is woven. The tension of the fiber tape is adjusted to 100 N.

[0066] Impregnation of absorbing slurry: Determine the length of the fiber tape according to the size of the component to be manufactured and the laying plan. For example, the height of the component in this embodiment is 1m and the diameter is 1m. According to the laying plan, the laying thickness of each prepreg is 1.4mm, and the thickness of a single layer of prepreg is 0.2mm, so the length of each prepreg needs to be about 1100m; then, place 1# to 4# absorbing slurries in the absorbing slurry pool respectively, and feed the arranged glass fibers into the slurry pool respectively. The glass fiber tape travels at a speed of 1m / min to obtain impregnated 1# to 4# prepreg tapes; then feed the impregnated 1# to 4# prepreg tapes into the squeezing rollers, and adjust the roller gap to 0.2mm; finally, feed the 1# to 4# prepreg tapes into the drying tunnel, set the temperature to 70°C, the drying tunnel length to 20m, and the prepreg tape travel speed to 1m / min. After cooling, use a winding device to cover the upper and lower surfaces of the absorbing prepreg tapes with polyethylene film to obtain 1# to 4# absorbing prepreg tapes.

[0067] Layering: Select glass fiber impregnated medium temperature epoxy resin prepreg as the wave-transmitting prepreg, and lay the wave-transmitting prepreg on the surface of the core mold. The thickness of a single prepreg is 0.2mm, the width is 50mm, and the laying thickness is 1.4mm; then according to the electrical performance requirements, lay 4# absorbing prepreg (laying thickness is 1.4mm), wave-transmitting prepreg (laying thickness is 2mm), 3# absorbing prepreg (laying thickness is 1.4mm), and transparent prepreg layer by layer on the surface of the wave-transmitting prepreg layer. Wave prepreg tape (laying thickness is 2mm), 2# wave absorbing prepreg tape (laying thickness is 1.4mm), wave transparent prepreg tape (laying thickness is 2mm), 1# wave absorbing prepreg tape (laying thickness is 1.4mm), and then according to the mechanical performance requirements, carbon fiber prepreg tape (carbon fiber impregnated with medium temperature epoxy resin prepreg tape) is laid on the surface of 1# wave absorbing prepreg tape. The thickness of a single carbon fiber prepreg tape is 0.2mm, the width is 50mm, and the laying thickness is 1.0mm.

[0068] Curing and molding: The prepreg tape after laying is placed together with the core mold into an autoclave for curing and molding. During the curing and molding process, a pressure of 0.3 MPa is applied, and the temperature is raised to 135°C at a heating rate of 5°C / min and kept warm for 2 hours. The temperature is naturally cooled to room temperature, the pressure is released, and the mold is demolded to obtain the absorbing structure.

[0069] The present invention verifies the wave absorbing structure reduction effect of the wave absorbing structure prepared in this embodiment (the frequency point is selected as 3GHz), closes one side port and covers the inner cavity with aluminum foil to simulate the metal state (such as Figure 3 ), close one side of the port and tear off the aluminum foil inside to simulate the absorbing state (such as Figure 4 ), RCS test comparison curves of the absorbing structure simulating the metal state and the simulated absorbing state (such as Figure 5 , the unit of the horizontal axis azimuth angle is °) It can be seen that the absorbing structure prepared in this embodiment has a good scattering characteristic reduction effect.

[0070] The RCS mean statistics of the absorbing structure prepared in this embodiment are shown in Table 1, and the mechanical property data are shown in Table 2.

[0071] Comparative Example 1

[0072] A method for preparing an absorbing structure comprises the following steps:

[0073] Preparation of microwave absorbing prepreg: same as in Example 1.

[0074] Laying: Carbon fiber prepreg tapes (carbon fiber impregnated with medium-temperature epoxy resin prepreg tapes) are laid layer by layer on the surface of the core mold. The thickness of a single carbon fiber prepreg tape is 0.2 mm, the width is 50 mm, and the laying thickness is 14 mm.

[0075] Curing and molding: The prepreg tape after laying is placed together with the core mold into an autoclave for curing and molding. During the curing and molding process, a pressure of 0.3 MPa is applied, and the temperature is raised to 135°C at a heating rate of 5°C / min and kept warm for 2 hours. The temperature is naturally cooled to room temperature, the pressure is released, and the mold is demolded to obtain a carbon fiber sample.

[0076] Spraying absorbing slurry: spray 1# to 4# absorbing slurries on the inner surface of the carbon fiber sample in sequence, with a spraying thickness of 1.4mm. Oven cure at a curing temperature of 135℃ and keep warm for 2h to obtain an absorbing structure.

[0077] The present invention tests and verifies the reduction effect of the absorbing structure prepared in this comparative example (selecting the frequency point 3GHz), and the test method is referred to Example 1. The RCS test comparison curves of the absorbing structure simulating the metal state and the simulated absorbing state (such as Figure 6 , the unit of the horizontal axis azimuth angle is °) It can be seen that the absorbing structure prepared in this comparative example has only a slight scattering feature reduction effect.

[0078] The RCS mean statistics of the absorbing structure prepared in this comparative example are shown in Table 1, and the mechanical property data are shown in Table 2.

[0079] Comparative Example 2

[0080] The method is basically the same as Example 1, except that: during the layering process, the absorbing prepreg tape is replaced with an absorbing film;

[0081] The preparation method of the absorbing film includes: coating the prepared 1#~4# absorbing slurry on the release paper by wet casting method, with a coating thickness of 0.2mm, drying in a 40℃ drying oven for 30 minutes to obtain 1#~4# semi-cured absorbing film, sealing it with a polyethylene bag, and storing it in a cold storage at -18℃.

[0082] The present invention tests and verifies the reduction effect of the absorbing structure prepared in this comparative example (selecting the frequency point 3GHz), and the test method is referred to Example 1. The RCS test comparison curves of the absorbing structure simulating the metal state and the simulated absorbing state (such as Figure 7 , the unit of the horizontal axis azimuth angle is °). It can be seen that the absorbing structure prepared in this comparative example has a good scattering characteristic reduction effect. However, since the absorbing film does not have structural strength, manual laying is required, the preparation cycle is long, and the mechanical properties of the absorbing structure are poor, see Table 2.

[0083] The RCS mean statistics of the absorbing structure prepared in this comparative example are shown in Table 1, and the mechanical property data are shown in Table 2.

[0084] Comparative Example 3

[0085] The method is basically the same as Example 1, with the only difference being that during the process of impregnating the absorbing slurry, the glass fiber tape is replaced with glass fiber cloth.

[0086] The present invention tests and verifies the reduction effect of the absorbing structure prepared in this comparative example (selecting the frequency point 3GHz), and the test method is referred to Example 1. The RCS test comparison curves of the absorbing structure simulating the metal state and the simulated absorbing state (such as Figure 8 ) It can be seen that the absorbing structure prepared in this comparative example has a good scattering characteristic reduction effect, but since the glass fiber cloth needs to be manually laid for large curvature components, gaps will be generated, the preparation cycle is long, and the mechanical properties of the absorbing structure are poor, see Table 2.

[0087] The RCS mean statistics of the absorbing structure prepared in this comparative example are shown in Table 1, and the mechanical property data are shown in Table 2.

[0088] Table 1. RCS mean statistics of the absorbing structures prepared in the embodiments of the present invention and the comparative examples

[0089] <![CDATA[3GHz / metal (m 2 )]]> <![CDATA[3GHz / Absorbing wave (m 2 )]]> Example 1 4.4079 0.3913 Comparative Example 1 4.4079 2.2462 Comparative Example 2 4.4079 0.6472 Comparative Example 3 4.4079 0.5575

[0090] Table 2. Mechanical properties of the absorbing structures prepared in the examples of the present invention and the comparative examples

[0091] Bending strength / MPa Interlaminar shear strength / MPa Longitudinal and transverse shear strength / MPa Example 1 555.7 35.7 90.2 Comparative Example 1 545.3 36.2 93.3 Comparative Example 2 221.0 16.1 37.4 Comparative Example 3 435.9 25.6 64.2

[0092] In summary, compared with the preparation method of the traditional cylindrical absorbing structure of the absorbing rotating body component, the method of preparing the absorbing structure based on the tape laying (laying prepreg tape) process of the present invention has a simple process, convenient operation, and the scattering characteristics of the absorbing structure prepared are significantly reduced, and has good application prospects.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing an absorbing structure based on a tape laying process, characterized in that: The preparation method comprises: S1. The fiber tape is impregnated into the absorbing slurry, pressed by rollers, and dried to obtain an absorbing prepreg; S2. The wave-transmitting prepreg, the wave-absorbing prepreg and the carbon fiber prepreg are wound and laid to obtain a prepreg after laying; the wave-transmitting prepreg is a glass fiber prepreg, a quartz fiber prepreg and an aramid fiber prepreg; S3. The prepreg tape after the layup is cured and formed to obtain an absorbing structure; The prepreg tape after laying includes an inner layer formed by laying the wave-transmitting prepreg tape, an intermediate layer formed by laying the wave-absorbing prepreg tape, and an outer layer formed by laying the carbon fiber prepreg tape; or The prepreg tape after laying includes an inner layer formed by laying the wave-transmitting prepreg tape, a middle layer formed by alternately laying the wave-absorbing prepreg tape and the wave-transmitting prepreg tape, and an outer layer formed by laying the carbon fiber prepreg tape.

2. The preparation method according to claim 1, characterized in that The fiber used in the fiber tape is one or more of glass fiber, quartz fiber, and aramid fiber; The width of the fiber tape is 9 to 50 mm; and / or The tension of the fiber belt is 60-100N.

3. The preparation method according to claim 1, characterized in that The absorbing slurry comprises an absorbent, a resin and an additive; the absorbent accounts for 2-20 wt% of the absorbing slurry.

4. The preparation method according to claim 3, characterized in that The absorbent is a dielectric absorbent, and the dielectric absorbent is one or more of carbon black, graphene, carbon nanotubes, and silicon carbide; The resin is one or more of polyurethane resin, medium-temperature epoxy resin and polyimide resin; and / or The auxiliary agents include diluents, anti-settling agents and dispersants.

5. The preparation method according to claim 1, characterized in that The wave-transmitting prepreg tape, the wave-absorbing prepreg tape and the carbon fiber prepreg tape use the same resin system.

6. The preparation method according to claim 1, characterized in that The fiber tape travels at a speed of 1-2 m / min during the impregnation process.

7. The preparation method according to claim 1, characterized in that The roller distance during the pressing process is 0.02-0.06 mm greater than the thickness of the fiber strip.

8. The preparation method according to claim 5, characterized in that The drying temperature is lower than the curing temperature of the resin system.

9. A wave absorbing structure based on tape laying process, characterized in that: The method is prepared according to any one of claims 1 to 8.

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