Carbon fiber polymer precursor pre-chemical grafting device
By modifying it with a high-pressure electrostatic spray device during the preparation of the carbon fiber polymer precursor, the problem of uneven liquid oxidant modification in the prior art is solved, and a more uniform pre-oxidation treatment is achieved, and the performance of carbon fiber is improved.
Patent Information
- Application Number
- CN202421635650.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In the prior art, when modifying the carbon fiber polymer precursor with liquid oxidizer, there are problems such as excessive droplet size, poor adhesion, uneven modification, and difficulty in contact with the polymer core, resulting in uneven preoxidation and affecting the performance of carbon fiber.
The carbon fiber polymer precursor is modified by a high-pressure electrostatic spray device, and the liquid oxidant is atomized through an electrostatic spray head, reducing the size to the micron level, ensuring that the core polymer tow is modified, increasing adhesion and achieving more uniform modification.
The adhesion between the carbon fiber polymer precursor and the liquid oxidant is improved, making the carbon fiber more wet and the modification is more uniform, ensuring the uniformity of the preoxidation process, thereby improving the performance of the carbon fiber.
Smart Images
Figure CN222771196U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of carbon fiber preparation, in particular to a carbon fiber polymer precursor prechemical grafting device. Background Art
[0002] Carbon fiber polymer precursor, also known as carbon fiber precursor, is the polymer precursor used to produce carbon fiber; carbon fiber is widely used in many fields such as aerospace, automobile, shipbuilding, sports equipment, energy, etc. due to its ultra-high strength, good corrosion resistance, thermal stability, electrical conductivity and design freedom; carbon fiber mostly uses polymer as precursor, such as polyacrylonitrile (PAN), viscose fiber, polyimide, polybenzothiazole, etc.; polymer precursor is transformed into carbon fiber through three main technical processes of spinning, pre-oxidation, and carbonization; among them, the pre-oxidation process is the most critical step in the whole preparation process. Improper pre-oxidation process will cause uneven and insufficient pre-oxidation of polymer precursor, thus forming a "skin-core" structure, and ultimately affecting the performance of carbon fiber.
[0003] Prior to the pre-oxidation treatment of carbon fiber polymer precursor, it is necessary to first modify it with a liquid oxidant so that the carbon fiber polymer precursor can absorb microwaves. The liquid oxidant is generally modified by dripping liquid in a sand-containing funnel. The disadvantages of this method are as follows: 1. The droplet size produced by the funnel is too large and the adjustment range is limited. Once the gravity of the large droplet is greater than the adsorption force between the droplet and the geometric object, it is very easy to fall off the polymer. At the same time, it is difficult for the large droplet to contact the polymer filaments in the core; 2. The wettability between water or hydrogen peroxide solution and the carbon fiber polymer precursor is very poor, and it is difficult for small droplets to contact the polymer surface. It is easy to aggregate into large droplets and drip from the polymer, with poor adhesion, resulting in pre-oxidation failure and polluting the site; 3. The droplets can only fall on the upper surface of the bundled polymer, resulting in the lower surface of the polymer cannot be modified, or only partially modified; 4. The timing of droplet dripping is difficult to match with the wire feeding rate. If the dripping speed is too fast, it is easy to cause the droplet volume to be too large and then drip from the polymer; if the dripping speed is too slow, there will be gaps between the droplets dripping on the polymer, that is, modified areas and unmodified areas are prone to appear. In the subsequent microwave pre-oxidation treatment, it is easy to cause differences in the degree of pre-oxidation between the modified area and the unmodified area of the polymer, thereby causing structural defects of the carbon fiber. Utility Model Content
[0004] The utility model aims to solve the technical problem of providing a pre-chemical grafting device for modifying a carbon fiber polymer precursor through a high-voltage electrostatic spray device.
[0005] In order to solve the above technical problems, the technical solution of the carbon fiber polymer precursor pre-chemical grafting device of the utility model is:
[0006] It includes a carbon fiber polymer precursor, a wire feeding rack, a microwave pre-oxidation furnace and a drawing device; the carbon fiber polymer precursor is drawn out by the wire feeding rack, and also includes an electrostatic measuring instrument and a high-voltage electrostatic spray device; the carbon fiber polymer precursor is first measured by the electrostatic measuring instrument, and then enters the high-voltage electrostatic spray device for high-voltage electrostatic spraying, then passes through the microwave pre-oxidation furnace for pre-oxidation, and finally passes through the drawing device for drawing; the high-voltage electrostatic spray device includes a shell, a high-voltage electrostatic generator, an electrostatic nozzle and a plate electrode; the high-voltage electrostatic generator is electrically connected to the electrostatic nozzle and the plate electrode respectively, and the electrostatic nozzle and the plate electrode are both installed in the shell; the electrostatic nozzle and the plate electrode are arranged at intervals; the electrostatic nozzle is connected to a liquid storage tank through a pipeline, and the electrostatic nozzle provides a liquid oxidant through the liquid storage tank.
[0007] The liquid oxidant is pure water or a hydrogen peroxide solution.
[0008] The liquid oxidant is a hydrogen peroxide solution, and the concentration of the hydrogen peroxide solution is 10% to 30%.
[0009] The electrostatic spray head and the plate-shaped electrode are arranged in the housing at intervals up and down; the electrostatic spray head is located above the plate-shaped electrode.
[0010] A mist collecting cone is arranged at the bottom of the shell; the bottom end of the mist collecting cone is connected to a peristaltic pump through a pipeline; and the peristaltic pump is connected to a liquid storage tank through a pipeline.
[0011] A variable frequency pump, a valve and a pressure gauge are connected to the pipeline between the electrostatic spray head and the liquid storage tank.
[0012] The technical effect that can be achieved by the utility model is as follows: when the carbon fiber polymer precursor is modified by the utility model, the liquid oxidant is sprayed onto the carbon fiber polymer precursor through a high-voltage electrostatic spray device, and the high-voltage electrostatic spray device atomizes the liquid oxidant. After atomization, the size of the liquid oxidant is reduced to the micron level, so that the polymer bundles at the core of the carbon fiber polymer precursor can also be modified, thereby increasing the adhesion between the carbon fiber polymer precursor and the liquid oxidant, making the carbon fiber polymer precursor more moist, and by adopting a spraying method, the liquid oxidant can be sprayed more evenly. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:
[0014] Figure 1 The utility model is a structural schematic diagram of a carbon fiber polymer precursor prechemical grafting device. DETAILED DESCRIPTION
[0015] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0016] See also Figure 1 .
[0017] A carbon fiber polymer precursor prechemical grafting device, comprising a carbon fiber polymer precursor 21, a wire feeding frame 1, a microwave preoxidation furnace 12 and a drawing device 13; the carbon fiber polymer precursor 21 is drawn out by the wire feeding frame 1, and also comprises an electrostatic measuring instrument 2 and a high-voltage electrostatic spraying device; the carbon fiber polymer precursor 21 is first measured by the electrostatic measuring instrument 2, and then enters the high-voltage electrostatic spraying device for high-voltage electrostatic spraying, and then passes through the microwave preoxidation furnace 12 for preoxidation, and finally passes through the drawing device 13 for drawing; the high-voltage electrostatic spraying device comprises a shell 22, a high-voltage electrostatic generator 4, an electrostatic nozzle 3 and a plate The electrostatic spray head 3 and the plate-shaped electrode 5 are electrically connected to each other, and the electrostatic spray head 3 and the plate-shaped electrode 5 are both installed in the shell 22, and the electrostatic spray head 3 and the plate-shaped electrode 5 are arranged at intervals; specifically, the electrostatic spray head 3 and the plate-shaped electrode 5 are arranged in the shell 22 at intervals, and the electrostatic spray head 3 is located above the plate-shaped electrode 5; the electrostatic spray head 3 is connected to the liquid storage tank 7 through a pipeline, and the electrostatic spray head 3 provides a liquid oxidant through the liquid storage tank 7; specifically, the liquid oxidant is pure water or a hydrogen peroxide solution; when the liquid oxidant is a hydrogen peroxide solution, the concentration of the hydrogen peroxide solution is 10% to 30%.
[0018] In the present invention, when the carbon fiber polymer precursor 21 is pulled out by the wire feeding frame 1, due to the friction between the carbon fiber polymer precursor 21 and the roller of the wire feeding frame 1, the carbon fiber polymer precursor 21 itself is electrostatically charged after being pulled out. Therefore, it is necessary to first measure the positive and negative charges of the carbon fiber polymer precursor 21 by the electrostatic measuring instrument 2, and then adjust the polarity between the high-voltage electrostatic generator 4 and the plate-shaped electrode 5 to generate atomized droplets with a polarity opposite to that of the carbon fiber polymer precursor 21, and spray the carbon fiber polymer precursor 21; the present invention is through The liquid oxidant is atomized and sprayed through the electrostatic nozzle 3, and its size is reduced to the micron level, so that the polymer filaments at the core of the carbon fiber polymer precursor 21 can also be modified, thereby increasing the adhesion between the liquid oxidant and the carbon fiber polymer precursor 21, making the carbon fiber polymer precursor 21 more moist, and allowing the carbon fiber polymer precursor 21 to be modified more evenly. After the carbon fiber polymer precursor 21 is modified, the modified carbon fiber polymer precursor 21 is then sent to the microwave pre-oxidation furnace 12 for pre-oxidation treatment, and finally stretched through the stretching device 13.
[0019] Preferably, a mist collecting cone 6 is provided at the bottom of the shell 22 of the utility model, and the bottom end of the mist collecting cone 6 is connected to the peristaltic pump 11 through a pipeline, and the peristaltic pump 11 is connected to the liquid storage tank 7 through a pipeline; a frequency conversion pump 8, a valve 10 and a pressure gauge 9 are connected to the pipeline between the electrostatic nozzle 3 and the liquid storage tank 7; the utility model is provided with a mist collecting cone 6 at the bottom of the shell 22, so that during the spraying process of the high-pressure electrostatic spray device, the liquid oxidant that is not sprayed onto the carbon fiber polymer precursor 21 can be collected by the mist collecting cone 6, and then sent to the liquid storage tank 7 through the peristaltic pump 11 for reuse, and the liquid oxidant in the liquid storage tank 7 is sent to the electrostatic nozzle 3 for spraying through the frequency conversion pump 8. Before the electrostatic nozzle 3 sprays, the valve 10 needs to be opened first, and the pressure gauge 9 is used to measure the pressure.
Claims
1. A carbon fiber polymer precursor prechemical grafting device, comprising a carbon fiber polymer precursor (21), a wire feeder (1), a microwave preoxidation furnace (12) and a drafting device (13); the carbon fiber polymer precursor (21) is drawn out by the wire feeder (1), characterized in that: The invention also comprises an electrostatic measuring instrument (2) and a high-voltage electrostatic spray device; the carbon fiber polymer precursor (21) is first measured by the electrostatic measuring instrument (2), then enters the high-voltage electrostatic spray device for high-voltage electrostatic spraying, then passes through a microwave pre-oxidation furnace (12) for pre-oxidation, and finally passes through a drawing device (13) for drawing; the high-voltage electrostatic spray device comprises a housing (22), a high-voltage electrostatic generator (4), an electrostatic spray head (3), and a plate-shaped electrode (5); the high-voltage electrostatic generator (4) is electrically connected to the electrostatic spray head (3) and the plate-shaped electrode (5), respectively, and the electrostatic spray head (3) and the plate-shaped electrode (5) are both installed in the housing (22); the electrostatic spray head (3) and the plate-shaped electrode (5) are arranged at intervals; the electrostatic spray head (3) is connected to a liquid storage tank (7) through a pipeline, and the electrostatic spray head (3) provides a liquid oxidant through the liquid storage tank (7).
2. The carbon fiber polymer precursor pre-chemical grafting device according to claim 1, characterized in that: The liquid oxidant is pure water or a hydrogen peroxide solution.
3. The carbon fiber polymer precursor pre-chemical grafting device according to claim 2, characterized in that: The liquid oxidant is a hydrogen peroxide solution.
4. The carbon fiber polymer precursor pre-chemical grafting device according to claim 1, characterized in that: The electrostatic spray head (3) and the plate-shaped electrode (5) are arranged in a vertical interval in the housing (22); the electrostatic spray head (3) is located above the plate-shaped electrode (5).
5. The carbon fiber polymer precursor pre-chemical grafting device according to claim 4, characterized in that: A mist collecting cone (6) is provided at the bottom of the housing (22); the bottom end of the mist collecting cone (6) is connected to a peristaltic pump (11) via a pipeline; and the peristaltic pump (11) is connected to a liquid storage tank (7) via a pipeline.
6. The carbon fiber polymer precursor pre-chemical grafting device according to claim 1, characterized in that: A variable frequency pump (8), a valve (10) and a pressure gauge (9) are connected to the pipeline between the electrostatic spray head (3) and the liquid storage tank (7).