Carbon fiber liquid phase oxidation device and carbon fiber production system

Abstract

The application provides a carbon fiber liquid-phase oxidation device and a carbon fiber production system, and belongs to the technical field of carbon fiber manufacturing. The carbon fiber liquid-phase oxidation device comprises an oxidation tank and a conveying unit. An oxidation tank liquid inlet is arranged on a first side wall of the oxidation tank, and an oxidation tank liquid outlet is arranged on a second side wall opposite to the first side wall of the oxidation tank. The oxidation tank liquid inlet and the oxidation tank liquid outlet are respectively located at two ends in the length direction of the oxidation tank, and are communicated by a circulating pump. The conveying unit is configured to convey the carbon fiber along the length direction of the oxidation tank, and to immerse the carbon fiber in the oxidizing solution in the oxidation tank during the conveying process. The carbon fiber liquid-phase oxidation device can effectively improve the problem of poor uniformity of the concentration of the oxidizing solution, so as to obtain a good surface pretreatment effect, and then make the carbon fiber after the sizing treatment have excellent interfacial bonding strength with the resin matrix.

Description

Technical Field

[0001] This application relates to the field of carbon fiber manufacturing technology, and more specifically, to a carbon fiber liquid phase oxidation device and a carbon fiber production system. Background Technology

[0002] Carbon fiber typically refers to carbon materials with a carbon content of over 90%. It possesses both the excellent inherent properties of carbon graphite and the good processing capabilities of textile fibers, exhibiting advantages such as high strength, high modulus, good temperature resistance, excellent corrosion resistance, and low density. Currently, carbon fiber is widely used in aerospace, wind turbine blades, pressure vessels, and high-end sporting goods. However, the highly inert surface of carbon fiber (especially high-modulus carbon fiber) results in poor interfacial bonding strength between it and the resin matrix, thus limiting its promotion and application.

[0003] Currently, surface pretreatment is typically performed before sizing to load polar groups onto the carbon fiber surface, thereby improving the sizing effect and ultimately enhancing the interfacial bonding strength between the carbon fiber and the resin matrix. Liquid-phase oxidation is one commonly used surface pretreatment method (specifically, a chemical reaction occurs when carbon fiber comes into contact with an oxidizing solution, generating numerous active functional groups on the carbon fiber surface, which helps improve the surface activity of the carbon fiber, thus enhancing the subsequent sizing effect; the better the sizing effect, the higher the interfacial bonding strength between the prepared carbon fiber and the resin matrix). However, existing liquid-phase oxidation devices suffer from poor structural design and inconsistent oxidizing solution concentration, leading to suboptimal surface pretreatment and consequently, poor interfacial bonding strength between the sized carbon fiber and the resin matrix. Utility Model Content

[0004] The purpose of this application is to provide a carbon fiber liquid phase oxidation device and a carbon fiber production system. The carbon fiber liquid phase oxidation device can effectively improve the problem of poor uniformity of oxidizing solution concentration, so as to achieve a better surface pretreatment effect, thereby enabling the carbon fiber after sizing treatment to have a better interfacial bonding strength with the resin matrix.

[0005] The embodiments of this application are implemented as follows: In a first aspect, embodiments of this application provide a carbon fiber liquid-phase oxidation device, including an oxidation tank and a conveying unit; the oxidation tank is used to contain an oxidizing solution, an oxidation tank inlet is provided on a first side wall of the oxidation tank, and an oxidation tank outlet is provided on a second side wall of the oxidation tank opposite to the first side wall. The oxidation tank inlet and the oxidation tank outlet are located at opposite ends of the length direction of the oxidation tank, and the oxidation tank inlet and the oxidation tank outlet are connected by a circulation pump to realize dynamic circulation of the oxidizing solution in the oxidation tank; the conveying unit is configured to convey carbon fibers along the length direction of the oxidation tank, and to immerse the carbon fibers in the oxidizing solution in the oxidation tank during the conveying process, so as to perform liquid-phase oxidation treatment on the carbon fibers through the oxidizing solution during the conveying process.

[0006] In the above technical solution, an oxidation tank inlet and an oxidation tank outlet are respectively provided on the first and second sidewalls, which are relatively distributed along the length of the oxidation tank. A circulation pump is used to connect the oxidation tank inlet and the oxidation tank outlet, so that the oxidizing solution in the oxidation tank can be dynamically circulated. Since the oxidation tank inlet and the oxidation tank outlet are located on both sides along the length of the oxidation tank, there is a large liquid disturbance range. This gives the oxidizing solution in the oxidation tank the advantage of good concentration uniformity, which helps to achieve a better surface pretreatment effect. As a result, the carbon fiber and the resin matrix after subsequent sizing treatment have a better interfacial bonding strength.

[0007] In some alternative implementations, in the height direction of the oxidation tank, the oxidation tank inlet is located on the side near the bottom of the oxidation tank, and the oxidation tank outlet is located on the side near the top of the oxidation tank.

[0008] In the above technical solution, setting the inlet of the oxidation tank on the side near the bottom of the oxidation tank and setting the outlet of the oxidation tank on the side near the top of the oxidation tank helps to further increase the turbulence range of the liquid, thereby enabling the concentration uniformity of the oxidizing solution in the oxidation tank to be further improved through dynamic circulation.

[0009] In some alternative embodiments, the carbon fiber liquid phase oxidation device also includes a circulation tank containing an oxidizing solution, with the inlet of the oxidation tank connected to the circulation tank via a circulation pump, and the outlet of the oxidation tank connected to the circulation tank.

[0010] In the above technical solution, the carbon fiber liquid phase oxidation device is equipped with a circulation tank containing an oxidizing solution, and the inlet and outlet of the oxidation tank are connected through the circulation tank. By utilizing the liquid storage function of the circulation tank, the dynamic circulation of the oxidizing solution can be achieved even when there are large volume fluctuations in the oxidizing solution in the oxidation tank, thereby improving the circulation stability of the oxidizing solution.

[0011] In some alternative implementations, a conductivity meter is also installed in the circulation tank, and the circulation tank is connected to an external replenishment tank.

[0012] In the above technical solution, a conductivity meter is added to the circulation tank and connected to an external replenishment tank. It can monitor the concentration of the oxidizing solution in the circulation tank in real time. When the concentration decreases to a certain level, the replenishment tank can be used to replenish the solution, so that the oxidizing solution in the circulation tank is always maintained within a better concentration range. This, in turn, keeps the oxidizing solution in the oxidation tank within a better concentration range, which helps to improve the surface pretreatment effect.

[0013] In some optional implementations, multiple oxidation tank inlets and multiple oxidation tank outlets are provided. Each oxidation tank inlet is connected to a circulation tank via a circulation pump, and each oxidation tank outlet is connected to a circulation tank. The multiple oxidation tank inlets are located on the first side wall and are spaced apart along the width of the oxidation tank, and the multiple oxidation tank outlets are located on the second side wall and are spaced apart along the width of the oxidation tank.

[0014] In the above technical solution, the inlet and outlet of the oxidation tank are each provided with multiple outlets and distributed in the above manner, which can further improve the disturbance range and circulation efficiency of the liquid, and help to further improve the concentration uniformity of the oxidizing solution in the oxidation tank through dynamic circulation.

[0015] In some alternative implementations, two oxidation tank inlets and two oxidation tank outlets are provided. In the width direction of the oxidation tank, the two oxidation tank inlets are located at both ends of the first sidewall, and the two oxidation tank outlets are located at both ends of the second sidewall.

[0016] In the above technical solution, there are two inlets and two outlets for the oxidation tank, which are distributed in the manner described above. This allows for the reservation of the middle area in the width direction of the oxidation tank, thus facilitating the transport of carbon fibers.

[0017] In some alternative implementations, the conveying unit includes multiple conveying rollers located within the oxidation tank. The multiple conveying rollers are spaced apart along the length of the oxidation tank and staggered along the height of the oxidation tank. The upper row of conveying rollers is located at a height close to the outlet of the oxidation tank, and the lower row of conveying rollers is located at a height close to the inlet of the oxidation tank.

[0018] In the above technical solution, multiple conveying rollers are staggered along the height of the oxidation tank, which helps to increase the conveying distance of carbon fibers in the oxidation tank, thereby increasing the processing time of liquid phase oxidation and achieving a better surface pretreatment effect. At the same time, the height of the upper row of conveying rollers is set close to the outlet of the oxidation tank, and the height of the lower row of conveying rollers is set close to the inlet of the oxidation tank. Since the liquid flow rate is higher in the areas near the inlet and outlet of the oxidation tank, the concentration of the oxidizing solution in these areas is more uniform. This setting also helps to improve the surface pretreatment effect on carbon fibers.

[0019] In some alternative implementations, the height of the upper row of conveyor rollers is the same as the height of the oxidation tank outlet, and the height of the lower row of conveyor rollers is the same as the height of the oxidation tank inlet.

[0020] In the above technical solution, the height of the upper row of conveying rollers is set to be consistent with the height of the outlet of the oxidation tank, and the height of the lower row of conveying rollers is set to be consistent with the height of the inlet of the oxidation tank. Since the liquid flow rate in the inlet and outlet areas of the oxidation tank is greater, the concentration of the oxidizing solution in this area is more uniform. This setting helps to better improve the surface pretreatment effect of carbon fibers.

[0021] In some optional implementations, filters are provided at the openings of the oxidation tank inlet and outlet; and / or a heating unit and a temperature sensor are provided inside the oxidation tank, and the heating unit and the temperature sensor are electrically connected.

[0022] In the above technical solution, filters are installed at the openings of the oxidation tank inlet and outlet, which can trap impurities such as lint and carbon chips that may be present in the oxidizing solution, reducing the risk of blockage in the circulation pipeline. In addition, the oxidation tank is equipped with an electrically connected heating unit and temperature sensor, which can monitor the oxidizing solution in the oxidation tank in real time and automatically control the temperature, so that the liquid phase oxidation treatment is always carried out under suitable temperature conditions, thereby helping to improve the surface pretreatment effect of carbon fibers.

[0023] Secondly, embodiments of this application provide a carbon fiber production system, including the carbon fiber liquid phase oxidation apparatus as provided in the first aspect embodiment.

[0024] In the above technical solution, the carbon fiber production system includes the carbon fiber liquid phase oxidation device provided in the first aspect embodiment. Since the carbon fiber liquid phase oxidation device can effectively improve the problem of poor uniformity of oxidizing solution concentration, it can achieve a better surface pretreatment effect, thereby making the carbon fiber prepared by the carbon fiber production system including the carbon fiber liquid phase oxidation device have a better interfacial bonding strength with the resin matrix. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of the first carbon fiber liquid phase oxidation device provided in the embodiments of this application, viewed from the front. Figure 2 A schematic diagram of the structure of the second carbon fiber liquid phase oxidation device provided in the embodiments of this application from a frontal view. Figure 3 This is a schematic diagram of the structure of an oxidation tank from a top view perspective, provided in an embodiment of this application. Figure 4 This is a schematic diagram of the structure of another oxidation tank provided in an embodiment of this application, viewed from the front.

[0027] Icons: 10- Carbon fiber liquid phase oxidation device; 100- Oxidation tank; 110- First side wall; 111- Oxidation tank inlet; 120- Second side wall; 121- Oxidation tank outlet; 122- Oxidation tank drain outlet; 130- Filter; 140- Heating unit; 150- Temperature sensor; 160- Support frame; 161- Substrate; 162- Support part; 200- Conveying unit; 210- Conveying roller; 300- Circulation tank; 310- Conductivity meter; a- Length direction of oxidation tank; b- Width direction of oxidation tank; c- Height direction of oxidation tank. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The following provides a detailed description of a carbon fiber liquid phase oxidation device and a carbon fiber production system provided in the embodiments of this application.

[0034] Firstly, see Figure 1 This application provides a carbon fiber liquid phase oxidation device 10, including an oxidation tank 100 and a conveying unit 200. The oxidation tank 100 is used to contain an oxidizing solution. The first side wall 110 of the oxidation tank 100 has an oxidation tank inlet 111, and the second side wall 120 of the oxidation tank 100 opposite to the first side wall 110 has an oxidation tank outlet 121. The oxidation tank inlet 111 and the oxidation tank outlet 121 are located at both ends of the length direction a of the oxidation tank, and the oxidation tank inlet 111 and the oxidation tank outlet 121 are connected by a circulation pump (not shown in the figure) to realize the dynamic circulation of the oxidizing solution in the oxidation tank 100. The conveying unit 200 is configured to convey carbon fibers along the length direction a of the oxidation tank, and to immerse the carbon fibers in the oxidizing solution in the oxidation tank 100 during the conveying process, so as to perform liquid phase oxidation treatment on the carbon fibers through the oxidizing solution during the conveying process.

[0035] In this application, along the length direction a of the oxidation tank, an oxidation tank inlet 111 and an oxidation tank outlet 121 are respectively provided on the first sidewall 110 and the second sidewall 120, which are relatively distributed. A circulation pump is used to connect the oxidation tank inlet 111 and the oxidation tank outlet 121, so that the oxidizing solution in the oxidation tank 100 can achieve dynamic circulation. Since the oxidation tank inlet 111 and the oxidation tank outlet 121 are located on both sides of the oxidation tank length direction a, there is a large liquid disturbance range. This gives the oxidizing solution in the oxidation tank 100 the advantage of good concentration uniformity, which helps to achieve a better surface pretreatment effect. As a result, the carbon fiber and the resin matrix after subsequent sizing treatment have a better interfacial bonding strength.

[0036] It should be noted that the oxidation tank 100 is made of stainless steel, and the inner wall of the oxidation tank 100 is provided with a protective layer, which is made of silicon carbide, polytetrafluoroethylene or phenolic ethylene resin.

[0037] See Figure 1 As an example, in the height direction c of the oxidation tank, the oxidation tank inlet 111 is located on the side near the bottom of the oxidation tank 100, and the oxidation tank outlet 121 is located on the side near the top of the oxidation tank 100.

[0038] In this embodiment, the oxidation tank inlet 111 is located on one side near the bottom of the oxidation tank 100 and the oxidation tank outlet 121 is located on one side near the top of the oxidation tank 100. This helps to further increase the range of liquid disturbance, thereby enabling the concentration uniformity of the oxidizing solution in the oxidation tank 100 to be further improved through dynamic circulation.

[0039] In other possible implementations, the oxidation tank inlet 111 may be located near the top of the oxidation tank 100, and the oxidation tank outlet 121 may be located near the bottom of the oxidation tank 100; the oxidation tank inlet 111 and the oxidation tank outlet 121 may both be located near the top of the oxidation tank 100; or the oxidation tank inlet 111 and the oxidation tank outlet 121 may both be located near the bottom of the oxidation tank 100.

[0040] Understandably, the oxidation tank 100 is also provided with an oxidation tank drain port 122 for discharging liquid, so that the solution in the oxidation tank 100 can be discharged after the liquid phase oxidation treatment is completed.

[0041] It should be noted that the location of the oxidation tank drain outlet 122 is not limited and can be adjusted according to actual needs.

[0042] See Figure 1As an example, both the oxidation tank outlet 121 and the oxidation tank drain outlet 122 are located on the second side wall 120, with the oxidation tank outlet 121 located on the top side near the oxidation tank 100 and the oxidation tank drain outlet 122 located on the top side near the oxidation tank 100.

[0043] It should be noted that the way the oxidation tank inlet 111 and the oxidation tank outlet 121 are connected by the circulation pump is not limited. For example, they can be directly connected or indirectly connected through other intermediate units.

[0044] See Figure 1 As an example, the conveying unit 200 includes a plurality of conveying rollers 210 located in the oxidation tank 100. The plurality of conveying rollers 210 are arranged at intervals along the length direction a of the oxidation tank and are staggered in the height direction c of the oxidation tank. The height of the upper row of conveying rollers 210 is close to the outlet 121 of the oxidation tank, and the height of the lower row of conveying rollers 210 is close to the inlet 111 of the oxidation tank.

[0045] In this embodiment, multiple conveying rollers 210 are staggered in the height direction c of the oxidation tank, which helps to increase the conveying distance of carbon fibers in the oxidation tank 100, thereby increasing the processing time of liquid phase oxidation and achieving a better surface pretreatment effect. At the same time, the height of the upper row of conveying rollers 210 is set to be close to the outlet 121 of the oxidation tank, and the height of the lower row of conveying rollers 210 is set to be close to the inlet 111 of the oxidation tank. Since the liquid flow rate is higher in the areas near the inlet 111 and outlet 121 of the oxidation tank, the concentration of the oxidizing solution in these areas is more uniform. This setting also helps to improve the surface pretreatment effect on carbon fibers.

[0046] It should be noted that the number of conveying rollers 210 located in the oxidation tank 100 is not limited and can be adapted to actual needs. For example, there can be two conveying rollers 210 in the upper row and three conveying rollers 210 in the lower row.

[0047] See Figure 1 As an example, the height of the upper row of conveyor rollers 210 is the same as the height of the oxidation tank outlet 121, and the height of the lower row of conveyor rollers 210 is the same as the height of the oxidation tank inlet 111.

[0048] In this embodiment, the height of the upper row of conveying rollers 210 is set to be consistent with the height of the oxidation tank outlet 121, and the height of the lower row of conveying rollers 210 is set to be consistent with the height of the oxidation tank inlet 111. Since the liquid flow rate in the areas of the oxidation tank inlet 111 and the oxidation tank outlet 121 is greater, the concentration of the oxidizing solution in this area is more uniform. This setting helps to better improve the surface pretreatment effect on carbon fibers.

[0049] It is understood that the conveying unit 200 includes not only the conveying roller 210 located inside the oxidation tank 100, but also a plurality of conveying rollers 210 located outside the oxidation tank 100. The number and position of the conveying rollers 210 located outside the oxidation tank 100 are not limited and can be set according to conventional selection in the art.

[0050] It should be noted that the conveyor roller 210 is made of stainless steel, and the outer wall of the conveyor roller 210 is provided with a protective layer, which is made of silicon carbide, polytetrafluoroethylene or phenolic ethylene resin.

[0051] See Figure 2 As an example, the carbon fiber liquid phase oxidation device 10 also includes a circulation tank 300 containing an oxidizing solution. The oxidation tank inlet 111 is connected to the circulation tank 300 via a circulation pump (not shown in the figure), and the oxidation tank outlet 121 is connected to the circulation tank 300.

[0052] In this embodiment, the carbon fiber liquid phase oxidation device 10 is equipped with a circulation tank 300 containing an oxidizing solution, and the inlet 111 and outlet 121 of the oxidation tank are connected through the circulation tank 300. With the liquid storage function of the circulation tank 300, the dynamic circulation of the oxidizing solution can be achieved even when there are large volume fluctuations in the oxidizing solution in the oxidation tank 100, thereby improving the circulation stability of the oxidizing solution.

[0053] See Figure 2 As an example, a conductivity meter 310 is also installed in the circulation tank 300, and the circulation tank 300 is connected to the external replenishment tank.

[0054] In this embodiment, a conductivity meter 310 is added inside the circulation tank 300 and is connected to an external replenishment tank. It can monitor the concentration of the oxidizing solution in the circulation tank 300 in real time. When the concentration decreases to a certain level, it can be replenished through the replenishment tank so that the oxidizing solution in the circulation tank 300 is always maintained within a better concentration range. This, in turn, ensures that the oxidizing solution in the oxidation tank 100 is also always maintained within a better concentration range, which helps to improve the surface pretreatment effect.

[0055] See Figure 2 and Figure 3As an example, multiple oxidation tank inlets 111 and multiple oxidation tank outlets 121 are provided. The multiple oxidation tank inlets 111 are connected to the circulation tank 300 through a circulation pump, and the multiple oxidation tank outlets 121 are connected to the circulation tank 300. The multiple oxidation tank inlets 111 are opened on the first side wall 110 and are distributed at intervals along the width direction b of the oxidation tank, and the multiple oxidation tank outlets 121 are opened on the second side wall 120 and are distributed at intervals along the width direction b of the oxidation tank.

[0056] In this embodiment, the oxidation tank 100 has multiple inlets and outlets, which are distributed in the manner described above. This can further improve the turbulence range and circulation efficiency of the liquid, and help to further improve the concentration uniformity of the oxidizing solution in the oxidation tank 100 through dynamic circulation.

[0057] See Figure 3 As an example, there are two oxidation tank inlets 111 and two oxidation tank outlets 121 respectively. In the width direction b of the oxidation tank, the two oxidation tank inlets 111 are located at both ends of the first side wall 110, and the two oxidation tank outlets 121 are located at both ends of the second side wall 120.

[0058] In this embodiment, two oxidation tank inlets 111 and two oxidation tank outlets 121 are provided and distributed in the manner described above, which can reserve the middle area in the width direction b of the oxidation tank, thereby facilitating the transport of carbon fibers.

[0059] See Figure 4 As an example, filters 130 are provided at the openings of the oxidation tank 100, where the oxidation tank inlet 111 and the oxidation tank outlet 121 are located.

[0060] In this embodiment, filters 130 are provided at the openings of the oxidation tank 100, both the inlet 111 and outlet 121 of the oxidation tank, which can trap impurities such as lint and carbon chips that may exist in the oxidizing solution, reducing the risk of the circulation pipeline being blocked.

[0061] See Figure 4 As an example, the oxidation tank 100 is also equipped with a heating unit 140 and a temperature sensor 150, and the heating unit 140 and the temperature sensor 150 are electrically connected.

[0062] In this embodiment, the oxidation tank 100 is also equipped with an electrically connected heating unit 140 and a temperature sensor 150, which can monitor the oxidizing solution in the oxidation tank 100 in real time and automatically control the temperature, so that the liquid phase oxidation treatment is always carried out under a relatively suitable temperature condition, thereby helping to improve the surface pretreatment effect of carbon fiber.

[0063] See Figure 4 As an example, the carbon fiber liquid phase oxidation device 10 also includes a support frame 160, the top of which is connected to the bottom of the oxidation tank 100.

[0064] It should be noted that the form of the support frame 160 is not limited and can be adapted to meet actual needs.

[0065] See Figure 4 As an example, the support frame 160 includes a substrate 161 and a plurality of support portions 162 protruding from the substrate 161. The tops of the plurality of support portions 162 are respectively connected to the bottom of the oxidation tank 100, so that the bottom area of ​​the oxidation tank 100 is partially suspended.

[0066] In this embodiment, the support frame 160 is configured as a combination of a base plate 161 and a support portion 162. The oxide tank 100 can be fixed in a preset position by means of the base plate 161 (for example, a threaded hole is opened on the base plate 161, and then the oxide tank 100 is fixed in a specific position by means of screws). At the same time, the bottom area of ​​the oxide tank 100 is partially suspended, which helps to provide a force point, thereby facilitating its transfer.

[0067] As an example, the support frame 160 is made of stainless steel.

[0068] It should be noted that, for any structural or functional units in the carbon fiber liquid phase oxidation device 10 that are not specifically described or limited, they can be set up in accordance with conventional selections in the art.

[0069] Secondly, embodiments of this application provide a carbon fiber production system, including the carbon fiber liquid phase oxidation device 10 as provided in the first aspect embodiment.

[0070] In this application, the carbon fiber production system includes the carbon fiber liquid phase oxidation device 10 provided in the first aspect embodiment. Since the carbon fiber liquid phase oxidation device 10 can effectively improve the problem of poor uniformity of oxidizing solution concentration, it can achieve a better surface pretreatment effect, thereby making the carbon fiber prepared by the carbon fiber production system including the carbon fiber liquid phase oxidation device 10 have a better interfacial bonding strength with the resin matrix.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A carbon fiber liquid-phase oxidation device, characterized in that, include: An oxidation tank is provided to contain an oxidizing solution. The first side wall of the oxidation tank has an oxidation tank inlet, and the second side wall opposite to the first side wall has an oxidation tank outlet. The oxidation tank inlet and the oxidation tank outlet are located at opposite ends of the length of the oxidation tank, and the oxidation tank inlet and the oxidation tank outlet are connected by a circulation pump to realize the dynamic circulation of the oxidizing solution in the oxidation tank. A conveying unit is configured to convey carbon fibers along the length of the oxidation tank and to immerse the carbon fibers in an oxidizing solution within the oxidation tank during the conveying process, so as to perform liquid-phase oxidation treatment on the carbon fibers by means of the oxidizing solution during the conveying process. In the height direction of the oxidation tank, the inlet of the oxidation tank is located near the bottom of the oxidation tank, and the outlet of the oxidation tank is located near the top of the oxidation tank. The carbon fiber liquid phase oxidation device also includes a circulation tank containing an oxidizing solution. The inlet of the oxidation tank is connected to the circulation tank via a circulation pump, and the outlet of the oxidation tank is connected to the circulation tank. The oxidation tank has multiple inlets and outlets. Each inlet is connected to the circulation tank via a circulation pump, and each outlet is connected to the circulation tank. The multiple inlets are located on the first sidewall and are spaced apart along the width of the oxidation tank, while the multiple outlets are located on the second sidewall and are spaced apart along the width of the oxidation tank.

2. The carbon fiber liquid-phase oxidation apparatus according to claim 1, characterized in that, The circulation tank is also equipped with a conductivity meter, and the circulation tank is connected to an external replenishment tank.

3. The carbon fiber liquid-phase oxidation apparatus according to claim 1, characterized in that, The oxidation tank has two inlets and two outlets. In the width direction of the oxidation tank, the two inlets are located at both ends of the first sidewall, and the two outlets are located at both ends of the second sidewall.

4. The carbon fiber liquid-phase oxidation apparatus according to any one of claims 1 to 3, characterized in that, The conveying unit includes multiple conveying rollers located in the oxidation tank. The multiple conveying rollers are arranged at intervals along the length direction of the oxidation tank and are staggered in the height direction of the oxidation tank. The upper row of conveying rollers is close to the liquid outlet of the oxidation tank, and the lower row of conveying rollers is close to the liquid inlet of the oxidation tank.

5. The carbon fiber liquid-phase oxidation apparatus according to claim 4, characterized in that, The height of the upper row of conveying rollers is the same as the height of the outlet of the oxidation tank, and the height of the lower row of conveying rollers is the same as the height of the inlet of the oxidation tank.

6. The carbon fiber liquid-phase oxidation apparatus according to any one of claims 1 to 3, characterized in that, Filters are provided at the openings of the oxidation tank inlet and outlet. Or / and, the oxidation tank is also equipped with a heating unit and a temperature sensor, and the heating unit and the temperature sensor are electrically connected.

7. A carbon fiber production system, characterized in that, The carbon fiber liquid phase oxidation apparatus includes any one of claims 1 to 6.

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