Search

CN-121976329-A - Copolymerization modification shortens polyacrylonitrile-based carbon fiber preoxidation device

CN121976329ACN 121976329 ACN121976329 ACN 121976329ACN-121976329-A

Abstract

The invention provides a copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device, which relates to the technical field of heating oxidation equipment, and comprises a heating pool, wherein a treatment fluid is contained in the heating pool, a mixing pot is arranged in the heating pool, the inside of heating pond is provided with rocks the unit, and wherein rocks the unit and can impress the fibre silk in the compounding pot, is provided with in the compounding pot and shakes the unit, and wherein shake the unit and shake the treatment fluid and let its even oxidation of washing away the fibre silk. According to the invention, through the cooperative cooperation of the shaking unit and the shaking unit, a dual homogenization system for actively shaking the fiber tows in the hydraulic vibration mode is constructed, so that the treatment liquid forms directional flow and continuously washes the fiber tows, the inner and outer layers of the tows and single fibers can be fully contacted with the treatment liquid, and the problems of large difference of the pre-oxidation degree of the inner and outer layers of the tows, serious skin-core structure and concentrated local heat release, which are easily caused by the traditional dipping device, are avoided.

Inventors

  • WANG WEI
  • LI HUI
  • YANG YONGGANG
  • LI ERYUE
  • LI YANG

Assignees

  • 中简科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260313

Claims (10)

  1. 1. The device for pre-oxidizing the polyacrylonitrile-based carbon fibers by copolymerization modification comprises a heating pool (1) and is characterized in that treatment fluid is contained in the heating pool (1), a mixing pot (3) is arranged in the heating pool (1), a shaking unit (5) is arranged in the heating pool (1), fiber filaments can be pressed into the mixing pot (3) by the shaking unit (5), and an oscillating unit (4) is arranged in the mixing pot (3), wherein the oscillating unit (4) can vibrate the treatment fluid to flush the fiber filaments for uniform oxidation.
  2. 2. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 1, wherein the bottom of the heating tank (1) is fixedly connected with a supporting fixing frame (2), and the heating tank (1) is fixed on the ground by means of the supporting fixing frame (2).
  3. 3. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 1, wherein the fiber yarn to be oxidized passes through the swaying unit (5) from the lower part of the swaying unit (5) and is pressed into the mixing pot (3).
  4. 4. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 3, wherein the shaking unit (5) comprises a fastening plate (51), the fastening plate (51) is fixed in the heating tank (1), a track plate (52) is fixedly connected to the bottom of the fastening plate (51), a sliding block (53) is slidingly connected to the inside of the track plate (52), two sliding blocks (53) are provided, a compression roller (56) is rotatably installed between the two sliding blocks (53), a limit rod (54) is fixedly connected to the upper end of the sliding block (53), the limit rod (54) slides through the track plate (52), the limit rod (54) can limit the sliding path of the sliding block (53) in the track plate (52), a swinging spring (55) is sleeved on the surface of the limit rod (54), one end of the swinging spring (55) is fixedly connected with the sliding block (53), the other end of the swinging spring (55) is fixedly connected with the track plate (52), the compression roller (56) can be driven by the elastic force of the swinging spring (55) to vibrate, the compression roller (57) is arranged on the surface of the compression roller (56), wherein the swinging spring (55) can be pressed to vibrate when the arc-shaped protrusion (57) presses the fiber yarn when the fiber yarn is conveyed on the surface of the pressing roller (56).
  5. 5. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 1, wherein the oscillation unit (4) comprises a driving shaft (41), a fixed arm (43) is fixedly connected to the surface of the driving shaft (41), a fixed plate (44) is fixedly connected to the port of the fixed arm (43), a sliding rod (45) is slidingly connected to the surface of the fixed plate (44), a connecting frame (46) is fixedly connected to the port of the sliding rod (45), a pulling spring (48) is fixedly connected between the sliding rod (45) and the fixed plate (44), the pulling spring (48) drives the connecting frame (46) to be far away from the fixed plate (44), a roller (47) is rotatably arranged at one end of the connecting frame (46), the connecting frame (46) can rotate inside the mixing pot (3) by means of the roller (47), a raised line (42) is uniformly and fixedly connected to the inside of the mixing pot (3), and the roller (47) can be pulled to generate pulling springs (48) when rolling between the raised lines (42), and can generate vibration to generate vibration on the heating pool (1) by moving the raised lines (47).
  6. 6. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 5, wherein one end of the sliding rod (45) is fixedly connected with a connecting plate (49), a swinging plate (410) is rotatably arranged on the surface of the connecting plate (49), and the swinging plate (410) can swing in the treatment fluid to vibrate the treatment fluid to enable the treatment fluid to flow when the swinging plate (410) swings along with the connecting plate (49).
  7. 7. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 6, wherein pushing components are arranged on the back sides of the two swinging plates (410), and can be used for always propping against the side surfaces of the two swinging plates (410) to ensure that the swinging plates (410) swing to generate treatment fluid oscillation in the swinging process of the connecting plates (49).
  8. 8. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 7, wherein the pushing component comprises a fork block (413), the fork block (413) is of a V-shaped structure, one end of the fork block (413) is fixedly connected with a track rod (411), the track rod (411) slides through a fixing plate (44), the fork block (413) can be blocked at one side of two swinging plates (410), a return spring (414) is sleeved on the surface of the track rod (411), two ends of the return spring (414) are respectively fixed with the fork block (413) and the fixing plate (44), and the fork block (413) can be always driven to abut against one side of the two swinging plates (410) by the aid of the elastic force of the return spring (414).
  9. 9. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 8, wherein a positioning nut (412) is sleeved on the surface of the track rod (411) in a threaded manner, and the positioning nut (412) can be screwed on the surface of the track rod (411) to limit the lower limit of movement of the track rod (411) to prevent the track rod (411) from being separated from the fixing plate (44) by using the positioning nut (412).
  10. 10. The copolymerization modified shortened polyacrylonitrile-based carbon fiber pre-oxidation device according to claim 5, wherein a driving motor (6) is fixedly connected to the bottom of the heating tank (1), a first gear (7) is fixedly connected to an output shaft of the driving motor (6), the driving shaft (41) rotates through the heating tank (1) by means of a sealing bearing, a mounting frame (8) is rotatably mounted on the surface of the driving shaft (41), the mounting frame (8) is fixed to the bottom of the heating tank (1), a second gear (9) is fixedly connected to the surface of the driving shaft (41), the second gear (9) is meshed with the first gear (7), and the driving shaft (41) can be driven to rotate by the driving motor (6).

Description

Copolymerization modification shortens polyacrylonitrile-based carbon fiber preoxidation device Technical Field The invention relates to the technical field of heating oxidation equipment, in particular to a pre-oxidation device for a polyacrylonitrile-based carbon fiber through copolymerization modification. Background Polyacrylonitrile (PAN) -based carbon fiber has become an indispensable key material in the strategic fields of aerospace, new energy, rail traffic, high-end equipment manufacturing and the like by virtue of excellent performances such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance and the like, and the industrialized development level of the polyacrylonitrile-based carbon fiber is directly related to the core competitiveness of the national high-end manufacturing industry. In the complete preparation process of PAN-based carbon fiber, pre-oxidation is a core key process for preparing and carbonizing a connecting precursor, the process is a chemical conversion process for converting a linear PAN molecular chain into a heat-resistant trapezoid structure, the reaction uniformity and process controllability of the process directly determine the structural stability and mechanical properties of the final carbon fiber, and the process is a core bottleneck for limiting the production efficiency and comprehensive cost of the carbon fiber. At present, a main stream PAN-based carbon fiber pre-oxidation process in the industry generally adopts stepped hot air circulation pre-oxidation in a multi-temperature area of 200 ℃ to 300 ℃, the total treatment time is 60 to 80 minutes, and the industrial common problems of long treatment period, high energy consumption and low single-line productivity exist. In order to solve the problem of overlong preoxidation period, a copolymerization modified PAN precursor technology is developed in industry step by step, and the activation energy of cyano cyclization reaction is reduced, the cyclization reaction rate is improved, and the time required by preoxidation reaction can be greatly shortened by introducing functional monomers into an acrylonitrile copolymerization system. But the cyclization reaction rate of the PAN precursor after copolymerization modification is obviously improved, and higher requirements are put on mass transfer and heat transfer uniformity in the pre-oxidation process, and the traditional pre-oxidation equipment cannot be matched with the rapid reaction characteristic of the modified precursor, so that the PAN precursor becomes a key obstacle for restricting the landing application of a pre-oxidation acceleration technology. The prior preoxidation device for PAN-based carbon fiber is mainly divided into a hot air circulating preoxidation furnace and a liquid-phase dipping preoxidation device. The hot air circulating type preoxidation furnace relies on hot air as a heat and mass transfer medium, has the problems of low heat transfer efficiency, large temperature difference between inner and outer layers of a filament bundle and difficult timely derivation of reaction heat release, and particularly has the problems of concentrated local heat release of the filament bundle, fiber melting and large difference between the inner and outer layer preoxidation degrees when being adapted to the copolymerization modified PAN precursor of rapid cyclization, so that the structural uniformity of the rapid preoxidation process of the modified precursor cannot be ensured. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a copolymerization modification and shortening polyacrylonitrile-based carbon fiber pre-oxidation device. In order to achieve the aim, the technical scheme is that the copolymerization modification shortening polyacrylonitrile-based carbon fiber pre-oxidation device comprises a heating tank, wherein a treatment cavity is formed in the heating tank, oxidation treatment liquid is contained in the treatment cavity of the heating tank, a mixing pot is fixed in the treatment cavity of the heating tank, a shaking unit is further arranged in the treatment cavity of the heating tank and is positioned above the mixing pot and used for pressing fiber filaments to be treated into the oxidation treatment liquid in the mixing pot downwards, and an oscillation unit is arranged in the mixing pot and used for driving the oxidation treatment liquid in the mixing pot to oscillate so as to flow and wash the fiber filaments to achieve uniform pre-oxidation. Preferably, the bottom fixedly connected with of heating pond supports the mount, the heating pond is vertical to be fixed in the installation ground through supporting the mount, makes the processing appearance chamber opening of heating pond set up. Preferably, the fiber yarn to be oxidized passes through the lower part of the shaking unit along the horizontal direction, and the shaking unit downwards presses