A process and application for metallizing the surface of fiber fabrics

Abstract

This invention relates to the field of fiber-reinforced resin-based composite materials, specifically to a process and application for metallizing the surface of fiber fabrics. The process includes the following steps: laying the fiber fabric to be metallized flat on a resin film, and bonding the resin film and fiber fabric together smoothly by hot pressing; pre-marking the areas on the fiber fabric surface to be metallized; pre-curing the flat fiber fabric; removing the pre-marked material from the pre-cured fiber fabric and protecting the areas not requiring coating; and using a flame spraying device to spray the target metal onto the fiber fabric surface, forming a dense metallized surface, thus obtaining a surface-metallized fiber fabric. The process is simple, highly adaptable, and easy to operate, and can be applied to fiber fabrics of different shapes, exhibiting good uniformity of fiber surface metallization.

Description

Technical Field

[0001] This invention relates to a process and application for metallizing the surface of fiber fabrics, belonging to the technical field of fiber-reinforced resin-based composite materials. Background Technology

[0002] New-generation fighter jets, unmanned combat platforms, satellites, and hypersonic vehicles, among other aerospace weaponry, extensively utilize various high-power subsystem packaging structures, conformal antenna structures, and other multifunctional structures. These structures largely employ resin-based composite materials. The electromagnetic radiation from different components causes mutual interference between them, thus necessitating increasingly stringent requirements for the electromagnetic shielding performance of composite materials. Surface metallization of fabric fibers has been widely studied as a solution for electromagnetic shielding of composite materials. Surface metallization of fabric fibers provides excellent conductivity, achieving electromagnetic shielding through the absorption and reflection effects of the metal layer.

[0003] In addition, due to the designability of composite materials, the functionalization of composite materials has become a research hotspot. Its applications in the fields of sound, light, electricity, magnetism, and heat are becoming increasingly widespread. Metallization of fiber fabric surfaces has high production value in the application of composite materials. Its application value includes: heating electrodes of conductive fabrics in composite materials; and carbon fabrics treated with thermal spraying as electrode materials for double-layer capacitors.

[0004] Currently, the most common metallization method is chemical plating of fiber fabrics, as illustrated in Chinese patents CN101550546A and CN112779480A. However, chemical plating itself suffers from cumbersome processes and complex operations, and the pretreatment process may cause some damage to the fibers themselves. Furthermore, the waste liquid generated during chemical plating also poses a certain environmental hazard. Therefore, there is a need to find a simple, environmentally friendly, and efficient method for metallizing the surface of fiber fabrics, while ensuring high uniformity of metallization. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a process and application for metallizing the surface of fiber fabrics. The process utilizes flame spraying to attach the desired metal to the surface of the fiber fabric in the form of particles, thereby achieving surface metallization. The process is simple, highly adaptable, and easy to operate. It is also applicable to fiber fabrics of different shapes, and the uniformity of the metallization on the fiber surface is good.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a process for metallizing the surface of fiber fabrics, the process comprising the following steps:

[0007] S1. Lay the fiber fabric to be metallized flat on the resin film, and bond the resin film and the fiber fabric together smoothly by hot pressing to avoid wrinkling of the fiber fabric.

[0008] S2. Pre-position the area on the surface of the fiber fabric to be metallized;

[0009] S3. Pre-curing treatment is performed on the flat fiber fabric;

[0010] S4. Remove the pre-occupied material from the pre-cured fiber fabric and protect the areas that do not need to be sprayed.

[0011] S5. Using a flame spraying device, the target metal is sprayed onto the surface of the fiber fabric to form a dense metallized surface, resulting in a surface-metallized fiber fabric.

[0012] Furthermore, the areal density of the resin film is (10-100) g / m³. 2 .

[0013] Furthermore, the resin film is composed of one or more of the following: epoxy resin film, bismaleimide resin film, cyanate ester resin film, polyimide resin film, phenolic resin film, and unsaturated polyester film. The function of the resin film is to fix the fiber fabric and prevent it from undergoing significant deformation during spraying, which would affect the spraying effect.

[0014] Furthermore, the fiber fabric is an inorganic fiber or an organic fiber, wherein the inorganic fiber is any one or a combination of carbon fiber, glass fiber, quartz fiber and silicon carbide fiber; and the organic fiber is one or a combination of aramid fiber, polybenzoxazole (PBO) fiber, ultra-high molecular weight polyethylene (UHMWPE) fiber and polyimide fiber.

[0015] Further, the specific operation of step S1 is as follows: Lay the fibrous fabric flat on the resin film, then place a release cloth on the other side of the resin film, and use an iron to heat and press the release cloth to soften the resin film and achieve a smooth bond with the fibrous fabric; or directly use a hair dryer to heat and soften the resin film, then use a scraper to smooth the resin film and achieve a smooth bond with the fibrous fabric. The release cloth can prevent the resin film from sticking to the iron or scraper.

[0016] Furthermore, the specific operation of step S2 is as follows: use pressure-sensitive tape to stick the area to be sprayed. During the application of pressure-sensitive tape, it should be laid flat without wrinkles. The edges of the tape are allowed to overlap, with an overlap width of (5-20) mm. It should be ensured that the sprayed area is completely protected to prevent the resin film from penetrating to the surface of the fiber fabric during the pre-curing process, thereby affecting the spraying of the fiber fabric surface.

[0017] In step S4, remove the pressure-sensitive tape from the area of ​​the fabric to be sprayed, and then use pressure-sensitive tape to protect the areas that do not need to be sprayed. This prevents spraying onto unrelated areas during the spraying process. After applying the pressure-sensitive tape, press it repeatedly to flatten it and prevent the tape from falling off during the spraying process. If necessary, clamps can be used for clamping and protection.

[0018] Furthermore, in step S3, after the flat fiber fabric is packaged with release cloth, breathable felt and vacuum bag respectively, it is pre-cured under vacuum conditions. The estimated curing temperature is (50-150)℃ and the estimated curing time is (5-100)min.

[0019] Furthermore, in step S5, the flame spraying device includes a combustion system composed of oxygen and acetylene, as well as metal wire and a flame spray gun, wherein the metal wire is any one of copper, brass, aluminum, silver, and gold.

[0020] Furthermore, in step S5, the yarn feeding speed is (0.5-5) m / min, and the distance between the spray gun and the fiber fabric is (50-200) mm.

[0021] Furthermore, in step S5, the horizontal movement speed of the spray gun relative to the fiber fabric during flame spraying is (V±10) m / s, where V=-1333P+66, P is the spraying pressure during flame spraying, and the unit of P is MPa.

[0022] Furthermore, the horizontal movement speed of the spray gun relative to the fiber fabric is (200~1000) mm / s, and the spraying pressure during flame spraying is (0.1~0.7) MPa.

[0023] Furthermore, in step S5, the target metal is sprayed onto the surface of the fiber fabric through multiple spraying processes. After one spraying, the process is temporarily stopped until the fabric surface cools down to room temperature before the next spraying is performed. The spraying process is completed after 2 to 5 sprayings.

[0024] The present invention also discloses the application of surface metallization of fiber fabrics, wherein the surface metallized fiber fabrics are used as heating electrodes of conductive fabrics in composite materials, and the resin film is the same as the resin matrix system of the composite material.

[0025] The beneficial effects of this invention are:

[0026] (1) In the process method of metallizing the surface of fiber fabric described in this invention, the surface metallization treatment of fiber fabric is achieved by flame spraying. Flame spraying has the advantage of wide flame temperature, so it can be applied to a variety of metals with different melting points, and it is easy to operate.

[0027] (2) Compared with traditional chemical plating methods that cause certain damage to fiber fabrics, flame spraying conducts less heat to the substrate, so the heat-affected zone is relatively shallow, and has less impact on fiber fabrics, films or prepregs, and the thermal deformation is relatively small.

[0028] (3) When using flame spraying for surface metallization, the surface requirements of the substrate are often high, and it is difficult to achieve the requirement of uniform and dense surface metallization. This is the main reason why chemical plating is used in this field. However, in the process of this invention, by combining the fiber fabric with the resin film before flame spraying, the wrinkling of the fiber fabric during the spraying process can be effectively avoided, which would lead to uneven spraying. In addition, by coordinating the parameters of spraying speed and spraying distance, the final spraying effect is ensured, and a uniform and dense metallized surface is finally formed. Attached Figure Description

[0029] Figure 1 This is a flowchart of the process method described in this invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below. The present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the invention.

[0032] Example 1

[0033] 1) Lay the epoxy resin film flat on the surface of the quartz fiber, and place a release cloth on the epoxy resin film. Use an electric iron to press the release cloth to iron the epoxy resin film onto the surface of the quartz fiber.

[0034] 2) Protect the area to be sprayed on the quartz fiber with pressure-sensitive tape, then lay the release cloth and breathable felt on the epoxy resin film of the quartz fiber in sequence, and then seal it with a vacuum bag. After the vacuum bag is evacuated, put it into the oven.

[0035] 3) Pre-curing is carried out in an oven. The pre-curing process is as follows: the room temperature is raised to 75°C, kept at that temperature for 40 minutes, and then cooled down. After cooling to room temperature, the product is taken out. The entire process is carried out under vacuum.

[0036] 4) After the pre-cured material is removed, remove the pressure-sensitive tape from the area to be sprayed, and then use pressure-sensitive tape to cover the area that does not need to be sprayed, so as to achieve a protective effect.

[0037] 5) Place the aluminum wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.3 MPa, the wire feeding speed is 2 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 460 mm / s, the distance between the spraying gun and the fiber fabric is 100 mm. Temporarily stop after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying three times.

[0038] 6. Test the surface resistance of the surface after spraying. The surface resistance is 9×10 -2 Ω / sq.

[0039] Example 2

[0040] 1) Lay the bis - maleimide resin film flat on the surface of the aramid fiber, and lay a release cloth on the bis - maleimide resin film. Iron the release cloth with an electric iron to iron the bis - maleimide resin film onto the surface of the aramid fiber.

[0041] 2) Protect the parts to be sprayed with pressure - sensitive tape, then lay a release cloth, a breather felt and a vacuum bag in sequence for encapsulation. After evacuating, place it in an oven.

[0042] 3) Conduct pre - curing in the oven. The pre - curing process is: heat from room temperature to 110 °C, keep warm for 60 min and then start to cool down. Take it out after cooling to room temperature. During the whole process, keep the vacuum state.

[0043] 4) After taking out the pre - cured product, remove the pressure - sensitive tape of the parts to be sprayed. Then lay a release cloth and a breather felt on the bis - maleimide resin film of the aramid fiber in sequence, and then encapsulate it with a vacuum bag. After the vacuum bag is evacuated, place it in an oven.

[0044] 5) Place the brass wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is​​​​​​​​​​​​​2) Protect the parts to be sprayed on the glass fiber with pressure-sensitive tape, then lay a release cloth and a breather felt on the epoxy resin film of the glass fiber in sequence, and then encapsulate them with a vacuum bag. After the vacuum bag is evacuated, it is placed in an oven.

[0049] 3) Conduct pre-curing in the oven. The pre-curing process is as follows: Heat from room temperature to 50 °C, keep warm for 10 min and then start to cool down. After cooling to room temperature, take it out. During the whole process, keep the vacuum state.

[0050] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect.

[0051] 5) Put the aluminum wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.1 MPa, the wire feeding speed is 1 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 200 mm / s, the distance between the spraying gun and the fiber fabric is 50 mm. Stop temporarily after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying twice.

[0052] 6) Test the surface resistance of the sprayed surface. The surface resistance is 9×10 -2 Ω / sq.

[0053] Example 4

[0054] 1) Lay the polyimide resin film flat on the surface of the carbon fiber, and lay a release cloth on the polyimide resin film. Iron the release cloth with an electric iron to iron the polyimide resin film on the surface of the glass fiber.

[0055] 2) Protect the parts to be sprayed on the carbon fiber with pressure-sensitive tape, then lay a release cloth and a breather felt on the polyimide resin film of the carbon fiber in sequence, and then encapsulate them with a vacuum bag. After the vacuum bag is evacuated, it is placed in an oven.

[0056] 3) Conduct pre-curing in the oven. The pre-curing process is as follows: Heat from room temperature to 150 °C, keep warm for 100 min and then start to cool down. After cooling to room temperature, take it out. During the whole process, keep the vacuum state.

[0057] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect.

[0058] 5) Place the silver wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.4 MPa, the wire feeding speed is 3 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 600 mm / s, the distance between the spraying gun and the fiber fabric is 150 mm. Stop temporarily after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying 5 times.

[0059] 6) Test the surface resistance of the sprayed surface. The surface resistance is 12×10 -2 Ω / sq.

[0060] Example 5

[0061] 1) Lay the phenolic resin film flat on the surface of the polyimide fiber, and lay a release cloth on the phenolic resin film. Iron the release cloth with an electric iron to iron the phenolic resin film onto the surface of the polyimide fiber;

[0062] 2) Protect the parts to be sprayed on the polyimide fiber with pressure-sensitive tape. Then, lay a release cloth and a breathable felt on the phenolic resin film of the polyimide fiber in sequence, and then seal them with a vacuum bag. After the vacuum bag is evacuated, put it into an oven.

[0063] 3) Conduct pre-curing in the oven. The pre-curing process is: heat from room temperature to 150 °C, keep warm for 100 min and then start to cool down. Take it out after cooling to room temperature. During the whole process, keep the vacuum state.

[0064] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use pressure-sensitive tape to stick the parts that do not need to be sprayed to play a protective role.

[0065] 5) Place the copper wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.6 MPa, the wire feeding speed is 5 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 860 mm / s, the distance between the spraying gun and the fiber fabric is100 mm. Stop temporarily after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying 3 times. ]

[0066] 6) Test the surface resistance of the sprayed surface. The surface resistance is 6×10 -2 Ω / sq.

[0067] Example 6 <>

[0068] 1) Lay the unsaturated polyester film flat on the surface of the polybenzoxazole fiber, and lay a release cloth on the unsaturated polyester film. Iron the release cloth with an electric iron to iron the unsaturated polyester film onto the surface of the polybenzoxazole fiber;

[0069] 2) Protect the parts to be sprayed on the polybenzoxazole fibers with pressure-sensitive tape, then lay a release cloth and a breather felt in sequence on the unsaturated polyester film of the polybenzoxazole fibers, and then seal them with a vacuum bag. After the vacuum bag is evacuated, put it into an oven.

[0070] 3) Carry out pre-curing in the oven. The pre-curing process is as follows: heat up from room temperature to 60 °C, keep warm for 5 minutes and then start to cool down. Take it out after cooling down to room temperature. During the whole process, keep the vacuum state.

[0071] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use the pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect.

[0072] 5) Put the aluminum wire into the spraying system, light the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.2 MPa, the wire feeding speed is 1.5 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 340 mm / s, the distance between the spraying gun and the fiber fabric is 80 mm. Stop temporarily after spraying once. After the surface of the quartz fiber cools down, carry out the next spraying. End the spraying after spraying 3 times.

[0073] 6) Test the surface resistance of the sprayed surface. The surface resistance is 11×10[[ID=!3]] -2 Ω / square.

[0074] Example 7

[0075] 1) Lay the epoxy resin film flat on the surface of the ultra-high molecular weight polyethylene fiber, and lay a release cloth on the epoxy resin film. Iron the release cloth with an electric iron to iron the epoxy resin film on the surface of the ultra-high molecular weight polyethylene fiber.

[0076] 2) Protect the parts to be sprayed on the ultra-high molecular weight polyethylene fiber with pressure-sensitive tape, then lay a release cloth and a breather felt in sequence on the epoxy resin film of the ultra-high molecular weight polyethylene fiber, and then seal them with a vacuum bag. After the vacuum bag is evacuated, put it into an oven.

[0077] 3) Carry out pre-curing in the oven. The pre-curing process is as follows: heat up from room temperature to 90 °C, keep warm for 50 minutes and then start to cool down. Take it out after cooling down to room temperature. During the whole process, keep the vacuum state.

[0078] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use the pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect. [[ID=!30]]

[0079] 5) Place the aluminum wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.6 MPa, the wire feeding speed is 2.5 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 870 mm / s, the distance between the spraying gun and the fiber fabric is 150 mm. Temporarily stop after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying 4 times.

[0080] 6) Test the surface resistance of the sprayed surface. The surface resistance is 15×10 -2 Ω / square.

[0081] Example 8

[0082] 1) Lay the bismaleimide resin film flat on the surface of the silicon carbide fiber, and lay a release cloth on the bismaleimide resin film. Iron the release cloth with an electric iron to iron the bismaleimide resin film onto the surface of the silicon carbide fiber.

[0083] 2) Protect the parts to be sprayed on the silicon carbide fiber with pressure-sensitive tape. Then, lay a release cloth and a breather felt on the bismaleimide resin film of the silicon carbide fiber in sequence, and then encapsulate them with a vacuum bag. After the vacuum bag is evacuated, put it into an oven.

[0084] 3) Conduct pre-curing in the oven. The pre-curing process is as follows: Raise the temperature from room temperature to 90 °C, start cooling after keeping warm for 60 min, and take it out after cooling to room temperature. During the whole process, keep the vacuum state.

[0085] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect.

[0086] 5) Place the silver wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.5 MPa, the wire feeding speed is 3 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 740 mm / s, the distance between the spraying gun and the fiber fabric is 200 mm. Temporarily stop after spraying once. After the surface of the quartz fiber cools down, conduct the next spraying. End the spraying after spraying 2 times.

[0087] 6) Test the surface resistance of the sprayed surface. The surface resistance is 5×10 -2 Ω / square.

[0088] Example 9

[0089] 1) Lay the epoxy resin film and the bismaleimide resin film (the weight ratio of the epoxy resin film to the bismaleimide resin film is 1:1) flat on the surface of the quartz fiber, and lay a release cloth on the resin film. Iron the release cloth with an electric iron to iron the epoxy resin film and the bismaleimide resin film onto the surface of the quartz fiber.

[0090] 2) Protect the parts to be sprayed on the quartz fiber with pressure-sensitive tape, then lay a release cloth and a breather felt on the epoxy resin film of the quartz fiber in sequence, and then package them with a vacuum bag. After the vacuum bag is evacuated, put it into an oven.

[0091] 3) Carry out pre-curing in the oven. The pre-curing process is as follows: raise the temperature from room temperature to 75 °C, keep warm for 40 min and then start to cool down. Take it out after cooling to room temperature. During the whole process, keep the vacuum state.

[0092] 4) After taking out the pre-cured product, remove the pressure-sensitive tape on the parts to be sprayed, and then use pressure-sensitive tape to stick the parts that do not need to be sprayed to achieve the protection effect.

[0093] 5) Put the aluminum wire into the spraying system, ignite the flame spraying gun. After it stabilizes, spray the required parts. The spraying pressure is 0.3 MPa, the wire feeding speed is 2 m / min, the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 460 mm / s, the distance between the spraying gun and the fiber fabric is 100 mm. Stop temporarily after spraying once. After the surface of the quartz fiber cools down, carry out the next spraying. End spraying after spraying 3 times.

[0094] 6. Test the surface resistance of the sprayed surface. The surface resistance is 8×10 -2 Ω / square.

[0095] Example 10

[0096] 1) Lay the bismaleimide resin film and the unsaturated polyester resin film (the weight ratio of the bismaleimide resin film to the unsaturated polyester resin film is 1:1) flat on the surface of the aramid fiber, and lay a release cloth on the bismaleimide resin film. Iron the release cloth with an electric iron to iron the bismaleimide resin film on the surface of the aramid fiber.

[0097] 2) Protect the parts to be sprayed with pressure-sensitive tape, then lay a release cloth, a breather felt and a vacuum bag in sequence for packaging. After evacuating, put it into an oven; <​​​​​​5) Place the brass wire into the spraying system, ignite the flame spraying gun, and after it stabilizes, spray the required parts. The spraying pressure is 0.7 MPa, the wire feeding speed is 4 m / min, and the horizontal moving speed of the spraying gun relative to the fiber fabric during spraying is 1000 mm / s. Stop spraying temporarily after one pass, and then conduct the next pass after the fabric surface cools down. End the spraying after 4 passes.

[0101] 6) Test the surface resistance of the sprayed surface, and the surface resistance is 3×10 -2 Ω / square.

[0102] Comparative Example 1

[0103] The surface metallization treatment of quartz fiber is carried out by the same method as in Example 1, except that: the moving speed of the spraying gun relative to the fiber fabric is 500 mm / s.

[0104] Test the surface resistance of the sprayed surface, and the surface resistance is 40×10 -2 Ω / square.

[0105] Comparative Example 2

[0106] The surface metallization treatment of quartz fiber is carried out by the same method as in Example 1, except that: the moving speed of the spraying gun relative to the fiber fabric is 400 mm / s.

[0107] Test the surface resistance of the sprayed surface, and the surface resistance is 35×10 -2 Ω / square.

[0108] Comparative Example 3

[0109] The surface metallization treatment of quartz fiber is carried out by the same method as in Example 3, except that: the moving speed of the spraying gun relative to the fiber fabric is 180 mm / s.

[0110] Test the surface resistance of the sprayed surface, and the surface resistance is 42×10 -2 Ω / square.

[0111] Comparative Example 4

[0112] The surface metallization treatment of quartz fiber is carried out by the same method as in Example 1, except that: the wire feeding speed is 6 m / min.

[0113] Test the surface resistance of the sprayed surface, and the surface resistance is 38×10 -2 Ω / square.

[0114] Comparative Example 5

[0115] The same method as in Example 2 was used to perform surface metallization on aramid fibers, except that the distance between the spray gun and the fiber fabric was 250 mm.

[0116] The surface resistance of the sprayed surface was tested, and the surface resistance was 20×10 -2 Ω / square.

[0117] Comparative Example 6

[0118] The same method as in Example 2 was used to perform surface metallization on aramid fibers, except that the number of spraying times was 1 time.

[0119] The surface resistance of the sprayed surface was tested, and the surface resistance was 45×10 -2 Ω / square.

[0120] Comparative Example 7

[0121] The same method as in Example 2 was used to perform surface metallization on aramid fibers, except that bis-maleimide resin was not bonded to the aramid fibers, and flame spraying was directly performed on the aramid fibers.

[0122] During the spraying process, wrinkles easily appeared on the aramid fibers, and uniform and dense metal surface treatment could not be achieved.

[0123] The relevant experimental data of Examples 1 to 10 are shown in Table 1 below, and the relevant experimental data of Comparative Examples 1 to 7 are shown in Table 2 below:

[0124] Table 1

[0125]

[0126] Table 2

[0127]

[0128]

[0129] From the experimental data of Examples 1 to 10, it can be seen that after the surface metallization treatment of the fiber fabric by the process method described in the present invention, the surface resistance data is very low, indicating that the process method of the present invention can meet the requirements of uniform and dense surface metallization treatment.

[0130] The spray gun movement speed of Comparative Examples 1, 2, and 3 did not meet the requirements of this invention (V = -1333P + 66, V is 200~1000mm / s), and the wire feeding speed of Comparative Example 4 did not meet the process conditions described in this invention. From the comparison of experimental data of Example 1 and Comparative Examples 1-2 and 4, it can be seen that the surface resistance data of Example 1 is significantly smaller than that of Comparative Examples 1-2 and 4. From the comparison of experimental data of Example 3 and Comparative Example 3, it can be seen that the surface resistance data of Example 3 is significantly smaller than that of Comparative Example 3. This indicates that by using the flame spraying conditions described in this invention, it is easier to obtain high-quality surface metallized fiber fabrics.

[0131] In Comparative Example 5, the distance between the spray gun and the fiber fabric was not within the range described in this invention; in Comparative Example 6, only one spraying was performed. A comparison of the experimental data from Example 2 and Comparative Examples 5-6 shows that the surface resistivity data of Example 1 is significantly lower than that of Comparative Examples 5-6, further demonstrating that using the flame spraying conditions described in this invention makes it easier to obtain high-quality surface metallized fiber fabrics.

[0132] In the process of Comparative Example 7, without pretreatment of the fiber fabric with resin film, it is impossible to achieve surface metallization of the fiber fabric.

[0133] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0134] For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A process for metallizing the surface of a fiber fabric, characterized in that, The process method includes the following steps: S1. Lay the fiber fabric to be metallized flat on the resin film, and bond the resin film and fiber fabric together smoothly by hot pressing. S2. Pre-position the area on the surface of the fiber fabric to be metallized; S3. Pre-curing treatment is performed on the flat fiber fabric; S4. Remove the pre-occupied material from the pre-cured fiber fabric and protect the areas that do not need to be sprayed. S5. Using a flame spraying device, the target metal is sprayed onto the surface of the fiber fabric to form a dense metallized surface, resulting in a surface-metallized fiber fabric. In step S5, the horizontal movement speed of the spray gun relative to the fiber fabric during flame spraying is (V±10) mm / s, where V=1333P+66, P is the spraying pressure during flame spraying, and the unit of P is MPa. During flame spraying, the filament feeding speed is (0.5-5) m / min, and the distance between the spray gun and the fiber fabric is (50~200) mm.

2. The process for metallizing the surface of fiber fabric according to claim 1, characterized in that, The areal density of the resin film is (10-100) g / m³. 2 The resin film is composed of one or more of the following: epoxy resin film, bismaleimide resin film, cyanate ester resin film, polyimide resin film, phenolic resin film, and unsaturated polyester film.

3. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, The fiber fabric is an inorganic fiber or an organic fiber. The inorganic fiber is any one or a combination of carbon fiber, glass fiber, quartz fiber and silicon carbide fiber. The organic fiber is one or a combination of aramid fiber, polybenzoxazole fiber, ultra-high molecular weight polyethylene fiber and polyimide fiber.

4. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, The specific operation of step S2 is as follows: use pressure-sensitive adhesive tape to stick the area to be sprayed, and the pressure-sensitive adhesive tape should be laid flat without wrinkles during the application process; In step S4, the pressure-sensitive tape on the area of ​​the fiber fabric that needs to be sprayed is removed, and then the areas that do not need to be sprayed are protected with pressure-sensitive tape.

5. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, In step S3, the flat fiber fabric is packaged with release cloth, breathable felt and vacuum bag respectively, and then pre-cured under vacuum conditions. The estimated curing temperature is (50-150)℃ and the estimated curing time is (5-100)min.

6. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, The horizontal movement speed of the spray gun relative to the fiber fabric is (200~1000) mm / s, and the spraying pressure during flame spraying is (0.1~0.7) MPa.

7. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, In step S5, the flame spraying device includes a combustion system composed of oxygen and acetylene, as well as metal wire and flame gun, wherein the metal wire is any one of copper, brass, aluminum, silver and gold.

8. The process for metallizing the surface of a fiber fabric according to claim 1, characterized in that, In step S5, the target metal is sprayed onto the surface of the fiber fabric through multiple spraying processes. After one spraying, the process is temporarily stopped until the fabric surface cools down to room temperature before the next spraying is carried out. The spraying process is completed after 2 to 5 sprayings.

9. An application of surface metallization of a fiber fabric according to any one of claims 1-8, characterized in that, The surface-metallized fiber fabric is used as a heating electrode in the conductive fabric of the composite material, and the resin film is the same as the resin matrix system of the composite material.

Images