Large-tow carbon fiber in-situ surface modification device

Abstract

The utility model belongs to the technical field of carbon fiber production equipment, and discloses a large-tow carbon fiber in-situ surface modification device. The device comprises a large-tow precursor frame, a bundling ring, a large-tow conveying roller set, a large-tow heating roller set, a carbon fiber surface oxidation heating loop, an in-situ modifier dipping spraying plate, a reaction furnace and a large-tow collecting roller set which are sequentially connected from front to back, and then the large-tow precursor frame, the bundling ring, the large-tow conveying roller set and the large-tow heating roller set are sequentially connected. The large-tow carbon fibers jointly pass through a large-tow precursor frame, a bundling ring, a large-tow conveying roller set, a large-tow heating roller set, a carbon fiber surface oxidation heating loop, an in-situ modifier dipping spraying plate, a reaction furnace and a large-tow collecting roller set in sequence. Through multi-aspect structural improvement, the structure of the surface modification device is simplified, the tensile strength and interlaminar shear strength of the carbon fiber composite material are effectively enhanced, the problems of insufficient reinforcement and low production efficiency of the original carbon fiber composite material are solved, and advanced manufacturing of the high-performance large-tow carbon fiber composite material is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon fiber production equipment, in particular to an in-situ surface modification device for large-tow carbon fibers. Background Art

[0002] Carbon fiber refers to fiber materials that have been carbonized at high temperatures and have a carbon content of more than 85%, including carbon fiber and graphite fiber. Carbon fiber is a fiber with a carbon content of 85% to 95% after being treated at 1000 to 2300°C; graphite fiber is a fiber with a carbon content of more than 98% after being treated at 2300°C. As a high-performance fiber, carbon fiber has become an important reinforcing material for resin-based composite materials in recent years due to its high specific strength, high specific modulus, low thermal expansion coefficient, low friction coefficient, and good low-temperature resistance. It is widely used in aerospace components and sporting goods. The surface of carbon fiber is inert, with a small specific surface area, few edge activated carbon atoms, low surface energy, poor resin wettability and two-phase interface adhesion, and low interlaminar shear strength of composite materials, which affects the comprehensive performance of composite materials and restricts the further promotion and application of carbon fiber in the field of advanced composite materials. In order to improve the performance of carbon fiber reinforced resin-based composite materials, the surface of carbon fiber must be modified to improve the bonding ability of carbon fiber and other materials, which is of great significance to improving the mechanical properties of carbon fiber composite materials. However, the existing processes are energy-intensive, environmentally destructive, inefficient, cause significant damage to the fibers, and are not suitable for continuous production. Therefore, it is urgent to develop new technologies to achieve efficient surface treatment of carbon fibers.

[0003] For example, Chinese utility model patent document CN220149947U discloses a carbon fiber nano-surface modification device, which includes a carbon fiber conveying roller group, a carbon fiber etching heating circuit, a carbon nanotube growth heating circuit, an ultrasonic dispersion tank and a reaction furnace; the carbon fiber passes through the ultrasonic dispersion tank and the reaction furnace in sequence through the carbon fiber conveying roller group; the carbon fiber conveying roller group includes a fiber electrified transmission roller, which is located at the front and rear ends of the reaction furnace, and the fiber electrified transmission roller is respectively connected to the carbon fiber etching heating circuit or the carbon nanotube growth heating circuit, and forms a loop heating with the carbon fiber between them. The utility model uses a method of directly electrifying and heating the heating circuit to etch and modify the carbon fiber, but the carbon fiber treated by it has surface oxidation and coating impregnation, which cannot be well removed.

[0004] In order to perform surface cleaning, Chinese utility model patent document CN219943947 U discloses a carbon fiber surface cleaner, which includes a base, a driving motor is arranged outside the base, a screw is fixedly connected to the outside of the driving motor, a plurality of clamps are threadedly connected to the outside of the screw, a connecting rod is slidably connected to the outside of the clamp, a bracket is fixedly connected to the top of the base, a cylinder is arranged on the top of the bracket, a slide is arranged outside the cylinder, a support rod is slidably connected to the outside of the slide, a reduction motor is arranged on the top of the slide, a main wheel is fixedly connected to the outside of the reduction motor, a secondary wheel is connected to the outside of the main wheel, a turntable is fixedly connected to the outside of the secondary wheel, and two cleaning plates are fixedly connected to the bottom of the turntable. Although the prior art can clean multiple carbon fiber tubes at one time, it cannot completely remove the oxidation of carbon fiber and the impregnation of the surface coating, especially the cleaning efficiency of oil stains is low and cannot be cleaned up, and on this basis, the carbon fiber tube cannot be modified, and its energy consumption is high. Summary of the invention

[0005] In view of the above-mentioned deficiencies, the utility model aims to provide a device for in-situ surface modification of large-tow carbon fibers. By improving the design of the structure in various aspects and simplifying the device structure, the electrothermal effect is used to realize carbon fiber oxidation and surface coating impregnation treatment during the fiber bundling process. This is beneficial to improving the process stability of large-tow carbon fiber surface treatment, meeting the preparation requirements of high-performance carbon fiber composites, and reducing processing energy consumption to promote the development of green and low-carbon technologies.

[0006] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0007] A large-tow carbon fiber in-situ surface modification device, which comprises: a large-tow precursor frame, a bunching ring, a large-tow conveying roller group, a large-tow heating roller group, a carbon fiber surface oxidation heating circuit, an in-situ modifier impregnation spray plate, a reaction furnace, and a large-tow bundling roller group connected in sequence from front to back;

[0008] The large tow raw wire rack, bunching ring, large tow conveying roller group, large tow heating roller group, carbon fiber surface oxidation heating circuit, in-situ modifier impregnation spray plate, reaction furnace and large tow bundling roller group are connected in sequence to make the large tow carbon fiber pass through in sequence from front to back.

[0009] Furthermore, a focusing ring is provided between the reaction furnace and the large-tow focusing roller group.

[0010] Furthermore, the large-tow precursor rack includes six precursor drum rollers.

[0011] Furthermore, the large-tow bundle-bundling roller group includes six raw yarn drum rollers matched with the large-tow raw yarn rack.

[0012] Furthermore, each of the raw yarn drum rollers includes: a large-tow carbon fiber yarn drum for accommodating large-tow carbon fibers.

[0013] The large-tow carbon fiber in-situ surface modification device provided by the utility model has the following beneficial effects:

[0014] 1. The utility model simplifies the overall structure of the modification device through various structural improvements, making its structure more compact, and has good effects on the oxidation of carbon fiber and the impregnation treatment of the surface coating, so that the tensile strength and interlaminar shear strength of the treated carbon fiber composite material are effectively enhanced compared with the material without surface treatment.

[0015] 2. Through various structural improvements, the utility model also effectively shortens the composite material molding cycle, solves the problems of insufficient reinforcement and low production efficiency of original carbon fiber composite materials, and promotes the advanced manufacturing of high-performance large-tow carbon fiber composite materials.

[0016] 3. The utility model uses the electrothermal effect to realize the oxidation of carbon fiber and the impregnation treatment of the surface coating through various structural improvements, avoiding the process fluctuations caused by factors such as ambient temperature and humidity in traditional processes, and improving the stability and consistency of surface treatment.

[0017] 4. The utility model can effectively improve the surface properties of carbon fiber and enhance its bonding strength with resin through various structural improvements and in-situ surface modification, thereby improving the mechanical properties of carbon fiber composite materials and meeting the preparation requirements of high-performance carbon fiber composite materials.

[0018] 5. Through various structural improvements, compared with traditional processes, this solution utilizes the electrothermal effect for surface treatment, which can reduce dependence on high-temperature furnaces and other equipment, thereby reducing energy consumption and achieving green and low-carbon production.

[0019] 6. The utility model uses air atmosphere to oxidize the surface of carbon fiber through various structural improvements, thus avoiding the use of toxic and harmful chemical reagents, which is beneficial to environmental protection and sustainable development.

[0020] The above is an overview of the technical solution of the utility model. The utility model will be further described below in conjunction with specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main structure of the large-tow carbon fiber in-situ surface modification device according to an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the top view of the structure of the large-tow carbon fiber in-situ surface modification device according to an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1. Large tow raw wire rack, 2. Bunching ring, 3. Large tow conveying roller group, 4. Large tow heating roller group, 5. Carbon fiber surface oxidation heating circuit, 6. In-situ modifier impregnation spray plate, 7. Reactor, 8. Large tow bundling roller group. DETAILED DESCRIPTION

[0025] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0026] Example 1

[0027] See also Figure 1 and Figure 2 The large-tow carbon fiber in-situ surface modification device provided in this embodiment includes: a large-tow precursor frame 1, a bunching ring 2, a large-tow conveying roller group 3, a large-tow heating roller group 4, a carbon fiber surface oxidation heating circuit 5, an in-situ modifier impregnation spray plate 6, a reaction furnace 7, and a large-tow bundling roller group 8 connected in sequence from front to back;

[0028] The large-tow precursor rack 1, the bunching ring 2, the large-tow conveying roller group 3, the large-tow heating roller group 4, the carbon fiber surface oxidation heating circuit 5, the in-situ modifier impregnation spray plate 6, the reaction furnace 7 and the large-tow bundling roller group 8 are adjacent to each other, and after being connected in sequence, the large-tow carbon fiber passes through in sequence from front to back, and completes the corresponding processing steps in the process of passing through each part.

[0029] When the untreated large-tow carbon fiber in-situ surface modification device is working, the large-tow carbon fiber enters through the large-tow raw wire rack 1 in sequence, passes through the bundling ring 2, the large-tow conveying roller group 3, the large-tow heating roller group 4, the carbon fiber surface oxidation heating circuit 5, the in-situ modifier impregnation spray plate 6, the reactor 7 and the large-tow bundling roller group 8, and is processed by each part accordingly. When it leaves the large-tow bundling roller group 8, it is a qualified product.

[0030] A bunching ring 2 is also arranged between the reaction furnace 7 and the large-tow bundling roller group 8; the large-tow precursor rack 1 includes six precursor tube rollers; the large-tow bundling roller group 8 includes six precursor tube rollers matching the large-tow precursor rack 1; each precursor tube roller includes: a large-tow carbon fiber tube for accommodating large-tow carbon fibers.

[0031] The large-tow carbon fiber yarn tube can accommodate large-tow carbon fiber yarns of 48K, 50K, 60K, 120K, 360K, etc., which can be selected according to actual needs; the in-situ modifier impregnation spray plate 6 includes a panel, and the panel is provided with spray holes, and the spray holes are set to 100-200, which are evenly distributed on the panel; the diameter of each spray hole is 0.1-0.5mm.

[0032] The reaction furnace 7 comprises: an air purge and tail gas collection device; the large tow bundling roller group 8 is also provided with a cooling fan for cooperation.

[0033] The specific method for in-situ surface modification of large-tow carbon fiber by each part (each station, process) of the device provided by the utility model adopts the conventional process flow in the prior art, which will not be specifically introduced here.

[0034] The utility model achieves energy saving and efficiency improvement through various structural improvements. Compared with the traditional process, the scheme uses the electrothermal effect for surface treatment, which can reduce the dependence on high-temperature furnaces and other equipment, thereby reducing energy consumption and achieving green and low-carbon production. The utility model uses air atmosphere to oxidize the surface of carbon fiber through various structural improvements, avoiding the use of toxic and harmful chemical reagents, which is beneficial to environmental protection and sustainable development.

[0035] Example 2

[0036] See also Figure 1 and Figure 2 This example is based on Example 1, using polyimide as the matrix resin, and taking a large-tow carbon fiber yarn tube of model T300 and a large-tow carbon fiber yarn number of 48K as an example for surface modification.

[0037] The present embodiment provides an in-situ surface modification device for large-tow carbon fibers, wherein the large-tow carbon fibers sequentially pass through a large-tow raw fiber rack 1, a bunching ring 2, a large-tow conveying roller group 3, a large-tow heating roller group 4, a carbon fiber surface oxidation heating circuit 5, an in-situ modifier impregnation spray plate 6, a reactor 7, a bunching ring 2, and a large-tow bunching roller group 8; the large-tow heating roller group 4 can effectively remove the epoxy resin remaining on the surface of the raw fiber bundle through high temperature; when the large-tow carbon fibers pass through the carbon fiber surface oxidation heating circuit 5, the surface oxidation of the large-tow carbon fibers is completed in an air atmosphere; when the large-tow carbon fibers pass through the spray plate 6, the spray holes arranged on the panel are used to spray an organic coating, and the spray can effectively form an organic coating on the surface of the oxidized large-tow carbon fibers, and then the large-tow carbon fibers are heated by the reactor 7, and the heating process can remove the solvent and promote the in-situ surface modification of the large-tow carbon fibers.

[0038] The large-tow precursor rack 1 used includes six precursor tube rollers, which can be loaded with T300's 48K large-tow carbon fiber tubes.

[0039] The large-tow heating roller group 4 is located between the clustering ring 2 and the carbon fiber surface oxidation heating circuit 5. The roller heating temperature of the large-tow heating roller group 4 can reach 450°C, which can achieve uniform heating of the large-tow carbon fiber and synchronous stripping of the original sizing agent.

[0040] The large-tow carbon fiber surface oxidation heating circuit 5 instantly heats the large-tow carbon fiber precursor to 2000° C. in an air atmosphere, promoting the generation of oxygen-containing functional groups on the surface of the large-tow carbon fiber.

[0041] The panel of the in-situ modifier impregnation spray plate 6 has 200 spray holes with a diameter of 0.5 mm, which can evenly disperse the pre-loaded surface modifier on the surface of the carbon fiber tow.

[0042] The heating temperature range of the reaction furnace 7 is 200° C. and it is equipped with air purge and tail gas collection devices, which is beneficial to the rapid solidification of the surface coating and the green production of carbon fiber.

[0043] The large tow bunching roller group 8 can bunch the surface-modified large tow carbon fibers in the traveling direction through the bunching ring 2, and the bunching speed is 16 m / min; the large tow bunching roller group 8 is also provided with a cooling fan for cooperation.

[0044] In summary, the above-mentioned embodiments of the utility model, through various structural improvements, effectively simplify the structure of the device, shorten the composite material molding cycle, solve the problems of insufficient reinforcement and low production efficiency of the original carbon fiber composite material, and promote the advanced manufacturing of high-performance large-tow carbon fiber composite materials; the comparison between the unmodified carbon fiber large tow and the modified carbon fiber large tow is shown in Table 1 (Comparison table of performance of fiber composite materials prepared with polyimide as matrix resin).

[0045] Table 1

[0046]

[0047] The prototype of the embodiment of the utility model has been actually tested under confidentiality conditions, verifying the surface modification device of the utility model; the utility model effectively shortens the composite material molding cycle through various structural improvements, solves the problems of insufficient reinforcement and low production efficiency of the original carbon fiber composite material, and promotes the advanced manufacturing of high-performance large-tow carbon fiber composite materials. The utility model focuses on the use of electrothermal effect to achieve carbon fiber oxidation and surface coating impregnation treatment through various structural improvements, avoiding process fluctuations caused by factors such as ambient temperature and humidity in traditional processes, and improving the stability and consistency of surface treatment.

[0048] The above-mentioned embodiments of the utility model make the structure more compact and more closely coordinated with the process through various structural improvements. Each part works in sequence to perform in-situ surface modification on the carbon fiber, which can effectively improve the surface properties of the carbon fiber and enhance the bonding strength between the carbon fiber and the resin, thereby enhancing the mechanical properties of the carbon fiber composite material and meeting the preparation requirements of high-performance carbon fiber composite materials.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any technical features that are the same or similar to those of the above embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A large-tow carbon fiber in-situ surface modification device, characterized in that: It includes, connected in sequence from front to back: a large tow raw yarn rack (1), a bunching ring (2), a large tow conveying roller group (3), a large tow heating roller group (4), a carbon fiber surface oxidation heating circuit (5), an in-situ modifier impregnation spray plate (6), a reaction furnace (7), and a large tow bunching roller group (8); The large-tow raw fiber rack (1), the bunching ring (2), the large-tow conveying roller group (3), the large-tow heating roller group (4), the carbon fiber surface oxidation heating circuit (5), the in-situ modifier impregnation spray plate (6), the reaction furnace (7) and the large-tow gathering roller group (8) are connected in sequence to jointly allow the large-tow carbon fibers to pass through in sequence from front to back.

2. The large-tow carbon fiber in-situ surface modification device according to claim 1, characterized in that: A bunching ring (2) is also provided between the reaction furnace (7) and the large-tow bunching roller group (8).

3. The large-tow carbon fiber in-situ surface modification device according to claim 1, characterized in that: The large-tow precursor rack (1) comprises six precursor drum rollers.

4. The large-tow carbon fiber in-situ surface modification device according to claim 3, characterized in that: The large-tow yarn collecting roller group (8) comprises six raw yarn drum rollers matched with the large-tow raw yarn rack (1).

5. The large-tow carbon fiber in-situ surface modification device according to any one of claims 3 or 4, characterized in that: Each of the raw yarn tube rollers is used to accommodate large-tow carbon fiber yarn tubes of large-tow carbon fibers.

6. The large-tow carbon fiber in-situ surface modification device according to claim 5, characterized in that: The number of filaments of the large-tow carbon fiber contained in the large-tow carbon fiber drum is one of 48K, 50K, 60K, 120K and 360K.

7. The large-tow carbon fiber in-situ surface modification device according to claim 1, characterized in that: The in-situ modifying agent impregnation spray plate (6) comprises a panel, and the panel is provided with spray holes, wherein the number of the spray holes is 100-200 and they are evenly distributed on the panel.

8. The large-tow carbon fiber in-situ surface modification device according to claim 7, characterized in that: The diameter of each spray hole is 0.1-0.5 mm.

9. The large-tow carbon fiber in-situ surface modification device according to claim 2, characterized in that: The reaction furnace (7) comprises: an air purge and tail gas collection device.

10. The large-tow carbon fiber in-situ surface modification device according to claim 1, characterized in that: The large-tow gathering roller group (8) is also provided with a cooling fan for cooperation.

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