Plasma processing device for preparing fiber reinforced strip and processing method thereof

Abstract

The invention discloses a plasma processing device for preparing a fiber reinforced strip and a processing method thereof.The plasma processing device comprises a plasma generating device, a front flow choking device and a rear flow choking device, the front flow choking device is arranged at the feeding end of the plasma generating device, and the rear flow choking device is arranged at the discharging end of the plasma generating device; a plurality of flow blocking containing cavities for containing air are formed in the front flow blocking device and the rear flow blocking device in the axial direction, a main air inlet is formed in the connecting position of the front flow blocking device and the plasma generating device, and a secondary air inlet is formed in the air inlet end of the front flow blocking device. Air brought into the treatment space by the tows is reduced through the flow blocking structure, uniform and stable plasma generation is facilitated, and the loss of mixed gas is reduced.

Description

Technical Field

[0001] The invention relates to a plasma processing device and a processing method thereof, in particular to a plasma processing device and a processing method thereof for preparing a fiber reinforced tape, belonging to the technical field of hoses. Background Art

[0002] Fiber-reinforced tapes are key materials for the preparation of various types of hoses. As the winding angle changes, the winding tape can enhance the hose's resistance to internal pressure, tension, and buckling. High-performance fibers such as aramid, polyarylate, PBI, and PBO are usually used as reinforcing phases to prepare fiber-reinforced tapes. However, the surface of high-performance fibers is highly inert and has poor bonding properties with water-based, oily, and hot-melt adhesives. Plasma treatment is an effective means to improve the surface properties of high-performance fibers. Atmospheric-pressure dielectric barrier discharge plasma devices do not require vacuuming and are the first choice for industrial fiber processing applications. However, stable atmospheric-pressure dielectric barrier discharge plasma devices often require the use of a mixed gas with argon and helium as the main components and mixed with oxygen, nitrogen, and other gases as the working atmosphere. In the continuous processing process, the gas loss is large and the processing cost is high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a plasma processing device and a processing method for preparing a fiber-reinforced tape, so as to reduce the loss of mixed gas.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A plasma treatment device for preparing a fiber-reinforced tape comprises a plasma generator, a front flow-blocking device and a rear flow-blocking device, wherein the front flow-blocking device is arranged at the feed end of the plasma generator, and the rear flow-blocking device is arranged at the discharge end of the plasma generator, a plurality of flow-blocking cavities for accommodating air are axially arranged in the front flow-blocking device and the rear flow-blocking device, a main air inlet is arranged at the connection between the front flow-blocking device and the plasma generator, and a secondary air inlet is arranged at the air inlet end of the front flow-blocking device.

[0005] Furthermore, the flow-blocking cavity includes a conical section, a cylindrical section, a tooth tip section and a tail cone section in sequence along the air flow direction, one end of the conical section is connected to one end of the cylindrical section, the other end of the cylindrical section is connected to one end of the tooth tip section, the other end of the tooth tip section is connected to one end of the tail cone section, and the plurality of flow-blocking cavities are connected end to end along the axial direction of the front flow-blocking device and the rear flow-blocking device.

[0006] Furthermore, the angle between the conical surface of the conical section and the axial direction of the front flow blocking device or the rear flow blocking device is smaller than the angle between the conical surface of the tail cone section and the axial direction of the front flow blocking device or the rear flow blocking device.

[0007] Furthermore, one end of the conical section is connected to one end of the cylindrical section by an arcuate surface transition, the other end of the cylindrical section is connected to one end of the tooth tip section by an arcuate surface transition, the conical surface of the tail cone section is arranged along the tangent direction of the other end of the tooth tip section, and the other end of the tail cone section is connected to one end of the conical section of the next flow-blocking cavity by an arcuate surface transition.

[0008] Furthermore, a ceramic coating is provided on the inner wall of the tooth tip section.

[0009] Furthermore, the choke cavity located at the air inlet end of the front choke device and the rear choke device includes a cylindrical section, a tooth tip section and a tail cone section, and the choke cavity located at the air outlet end of the front choke device and the rear choke device includes a conical section and a cylindrical section.

[0010] Furthermore, the plasma generating device comprises an upper electrode plate, a lower electrode plate, an upper ceramic insulating plate, a lower ceramic insulating plate, an upper heat dissipation fin and a lower heat dissipation fin, wherein the upper electrode plate and the lower electrode plate are symmetrically arranged above and below the reinforcing fiber, the upper ceramic insulating plate is fixed to the lower side of the upper electrode plate, the upper heat dissipation fin is fixed to the upper side of the upper electrode plate, the lower ceramic insulating plate is fixed to the upper side of the lower electrode plate, and the lower heat dissipation fin is fixed to the lower side of the lower electrode plate.

[0011] Furthermore, the upper electrode plate and the lower electrode plate are made of copper, aluminum or silver, and the structures of the upper electrode plate and the lower electrode plate are plate-like structures, mesh structures or thin-film coating structures.

[0012] Furthermore, the upper ceramic insulating plate and the lower ceramic insulating plate are made of alumina, beryllium oxide, boron nitride or aluminum nitride ceramics, the thickness of the upper ceramic insulating plate and the lower ceramic insulating plate is 1.0-2.0 mm, and the spacing between the upper ceramic insulating plate and the lower ceramic insulating plate is 1.0-2.0 mm.

[0013] A processing method of a plasma processing device for preparing a fiber-reinforced tape comprises the following steps: After the reinforcing fibers pass through three spreading convex rollers, the width of the reinforcing fibers is spread to 20-50 mm, and then the reinforcing fibers enter the plasma treatment device; The main gas inlet and the secondary gas inlet continuously introduce a mixed gas, which includes argon, oxygen and nitrogen, and the total filling rate of the mixed gas is 0.5-0.7L / min; The mixed gas is blocked in the flow blocking chambers of the front flow blocking device and the rear flow blocking device in the plasma processing device; The power frequency of the plasma generator is 2.0-5.0KHz, the voltage is 100-200V, and the speed of the reinforcing fiber in the plasma generator is 1.5-2.5m / min; The plasma treatment device inserts a ceramic insulating plate between high-frequency and high-voltage electrode plates to generate high-energy particles to micro-etch the surface of the reinforced fiber.

[0014] Compared with the prior art, the present invention has the following advantages and effects: 1. The present invention reduces the air brought into the processing space by the filament bundle through the flow-blocking structure, and reduces the working gas brought out of the processing space by the filament bundle through the flow-blocking structure, thereby maintaining a constant atmosphere in the processing space, and facilitating the generation of uniform and stable plasma; 2. The flow-blocking structure of the present invention can reduce the amount of working gas used in plasma processing and can reduce processing costs; 3. The treatment method of the present invention uses one-stage or multi-stage convex wire spreading rollers to spread the fiber bundle, which is more conducive to the uniform arrangement of the fiber bundle width and thinning, and can improve the uniformity of plasma treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a plasma processing device for preparing a fiber-reinforced tape according to the present invention.

[0016] Figure 2 It is a schematic diagram of the front flow blocking device and the rear flow blocking device of the present invention.

[0017] Figure 3 Schematic diagram of a plasma generating device according to the present invention. DETAILED DESCRIPTION

[0018] In order to elaborate on the technical scheme adopted by the present invention to achieve the predetermined technical purpose, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without paying creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0019] like Figure 1 As shown, a plasma treatment device for preparing a fiber reinforced tape of the present invention comprises a plasma generating device 1, a front flow blocking device 2 and a rear flow blocking device 3, wherein the front flow blocking device 2 is arranged at the feeding end of the plasma generating device 1, and the rear flow blocking device 3 is arranged at the discharging end of the plasma generating device 1, and a plurality of flow blocking cavities 4 for accommodating air are axially arranged in the front flow blocking device 2 and the rear flow blocking device 3, a main air inlet 5 is arranged at the connection between the front flow blocking device 2 and the plasma generating device 1, and a secondary air inlet 6 is arranged at the air inlet end of the front flow blocking device 2.

[0020] like Figure 2As shown, the flow-blocking cavity 4 includes a conical section 7, a cylindrical section 8, a tooth tip section 9 and a tail cone section 10 in sequence along the air flow direction, one end of the conical section 7 is connected to one end of the cylindrical section 8, the other end of the cylindrical section 8 is connected to one end of the tooth tip section 9, the other end of the tooth tip section 9 is connected to one end of the tail cone section 10, and a plurality of flow-blocking cavities 4 are connected end to end along the axial direction of the front flow-blocking device 2 and the rear flow-blocking device 3.

[0021] The angle between the conical surface of the conical section 7 and the axial direction of the front spoiler 2 or the rear spoiler 3 is smaller than the angle between the conical surface of the tail cone section 10 and the axial direction of the front spoiler 2 or the rear spoiler 3 .

[0022] One end of the conical section 7 is connected to one end of the cylindrical section 8 by an arcuate transition, the other end of the cylindrical section 8 is connected to one end of the tooth tip section 9 by an arcuate transition, the conical surface of the tail cone section 10 is arranged along the tangent direction of the other end of the tooth tip section 9, and the other end of the tail cone section 10 is connected to one end of the conical section 7 of the next flow-blocking cavity 4 by an arcuate transition.

[0023] The inner wall of the tooth tip section 9 is provided with a ceramic coating.

[0024] The choke cavity 4 located at the air inlet end of the front choke device 2 and the rear choke device 3 includes a cylindrical section 8, a tooth tip section 9 and a tail cone section 10, and the choke cavity 4 located at the air outlet end of the front choke device 2 and the rear choke device 3 includes a conical section 7 and a cylindrical section 8.

[0025] The plasma generating device 1 comprises an upper electrode plate 11, a lower electrode plate 12, an upper ceramic insulating plate 13, a lower ceramic insulating plate 14, an upper heat dissipation fin 15 and a lower heat dissipation fin 16. The upper electrode plate 11 and the lower electrode plate 12 are symmetrically arranged above and below the reinforcing fiber. The upper ceramic insulating plate 13 is fixed to the lower side of the upper electrode plate 11, the upper heat dissipation fin 15 is fixed to the upper side of the upper electrode plate 11, the lower ceramic insulating plate 14 is fixed to the upper side of the lower electrode plate 12, and the lower heat dissipation fin 16 is fixed to the lower side of the lower electrode plate 12.

[0026] The upper electrode plate 11 and the lower electrode plate 12 are made of copper, aluminum or silver. In this embodiment, the upper electrode plate 11 and the lower electrode plate 12 are preferably made of copper. The structure of the upper electrode plate 11 and the lower electrode plate 12 is a plate structure, a mesh structure or a thin film coating structure. In this embodiment, the structure of the upper electrode plate 11 and the lower electrode plate 12 is preferably a mesh structure. The diameter of the copper wire used in the mesh structure is 0.02-0.04mm, and the specification is 400-800 mesh. The upper electrode plate 11 and the lower electrode plate 12 of the mesh structure are bonded to the ceramic insulating plate and the heat dissipation fins with conductive adhesive.

[0027] The upper ceramic insulating plate 13 and the lower ceramic insulating plate 14 are made of alumina, beryllium oxide, boron nitride or aluminum nitride ceramics. In this embodiment, the upper ceramic insulating plate 13 and the lower ceramic insulating plate 14 are preferably alumina ceramics. The thickness of the upper ceramic insulating plate 13 and the lower ceramic insulating plate 14 is 1.0-2.0 mm, and the spacing between the upper ceramic insulating plate 13 and the lower ceramic insulating plate 14 is 1.0-2.0 mm.

[0028] A processing method of a plasma processing device for preparing a fiber-reinforced tape comprises the following steps: After the reinforcing fibers pass through three spreading convex rollers, the width of the reinforcing fibers is spread to 20-50 mm, and then the reinforcing fibers enter the plasma treatment device. In this embodiment, the reinforcing fibers are para-aramid filaments with a strength of 20 cN / dtex and a specification of 750D.

[0029] A mixed gas is continuously introduced into the main gas inlet and the secondary gas inlet. The mixed gas includes argon, oxygen and nitrogen. The total filling speed of the mixed gas is 0.5-0.7L / min.

[0030] The mixed gas is blocked in the blocking chambers of the front blocking device and the rear blocking device in the plasma processing device.

[0031] The power frequency of the plasma generator is 2.0-5.0 KHz, the voltage is 100-200 V, and the speed of the reinforcing fiber in the plasma generator is 1.5-2.5 m / min.

[0032] The plasma treatment device inserts a ceramic insulating plate between high-frequency and high-voltage electrode plates to generate high-energy particles to micro-etch the surface of the reinforced fiber.

[0033] After treatment, the water contact angle of the flat fiber bundle was tested by a contact angle meter and was 87°, which was significantly lower than the 103° of the untreated fiber. The surface chemical composition of the flat fiber bundle was analyzed by ESCALAB-250 X-ray photoelectron spectrometer (XPS), and the oxygen element was 21.4%, which was significantly higher than the 16.20% of the untreated fiber. The surface performance of the aramid fiber was effectively improved after treatment.

[0034] The present invention reduces the air brought into the processing space by the filament bundle through the flow-blocking structure, and reduces the working gas brought out of the processing space by the filament bundle through the flow-blocking structure, so as to keep the atmosphere in the processing space constant, and is conducive to the generation of uniform and stable plasma; the flow-blocking structure of the present invention can reduce the amount of working gas used in plasma processing, and can reduce the processing cost; the processing method of the present invention adopts one-stage or multi-stage wire-spreading convex rollers to spread the fiber bundle, which is more conducive to the uniform arrangement of the fiber bundle width, thinning and can improve the uniformity of plasma processing.

[0035] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A plasma treatment device for preparing fiber-reinforced tape, characterized in that: The invention comprises a plasma generating device, a front flow blocking device and a rear flow blocking device, wherein the front flow blocking device is arranged at the feeding end of the plasma generating device, the rear flow blocking device is arranged at the discharging end of the plasma generating device, a plurality of flow blocking cavities for accommodating air are arranged axially in the front flow blocking device and the rear flow blocking device, a main air inlet is arranged at the connection between the front flow blocking device and the plasma generating device, and a secondary air inlet is arranged at the air inlet end of the front flow blocking device.

2. A plasma treatment device for preparing a fiber-reinforced tape according to claim 1, characterized in that: The flow-blocking cavity comprises a conical section, a cylindrical section, a tooth tip section and a tail cone section in sequence along the air flow direction; one end of the conical section is connected to one end of the cylindrical section, the other end of the cylindrical section is connected to one end of the tooth tip section, the other end of the tooth tip section is connected to one end of the tail cone section, and the plurality of flow-blocking cavities are connected end to end along the axial direction of the front flow-blocking device and the rear flow-blocking device.

3. A plasma treatment device for preparing a fiber-reinforced tape according to claim 2, characterized in that: The angle between the conical surface of the conical section and the axial direction of the front flow blocking device or the rear flow blocking device is smaller than the angle between the conical surface of the tail cone section and the axial direction of the front flow blocking device or the rear flow blocking device.

4. The plasma treatment device for preparing a fiber-reinforced tape according to claim 2, characterized in that: One end of the conical section is connected to one end of the cylindrical section by an arcuate surface transition, the other end of the cylindrical section is connected to one end of the tooth tip section by an arcuate surface transition, the conical surface of the tail cone section is arranged along the tangent direction of the other end of the tooth tip section, and the other end of the tail cone section is connected to one end of the conical section of the next flow-blocking cavity by an arcuate surface transition.

5. The plasma treatment device for preparing a fiber-reinforced tape according to claim 2, characterized in that: A ceramic coating is arranged on the inner wall of the tooth tip section.

6. A plasma treatment device for preparing a fiber-reinforced tape according to claim 2, characterized in that: The choke cavity located at the air inlet end of the front choke device and the rear choke device includes a cylindrical section, a tooth tip section and a tail cone section, and the choke cavity located at the air outlet end of the front choke device and the rear choke device includes a conical section and a cylindrical section.

7. The plasma treatment device for preparing a fiber-reinforced tape according to claim 1, characterized in that: The plasma generating device comprises an upper electrode plate, a lower electrode plate, an upper ceramic insulating plate, a lower ceramic insulating plate, an upper heat dissipation tooth plate and a lower heat dissipation tooth plate. The upper electrode plate and the lower electrode plate are symmetrically arranged above and below the reinforcing fiber. The upper ceramic insulating plate is fixed to the lower side of the upper electrode plate, the upper heat dissipation tooth plate is fixed to the upper side of the upper electrode plate, the lower ceramic insulating plate is fixed to the upper side of the lower electrode plate, and the lower heat dissipation tooth plate is fixed to the lower side of the lower electrode plate.

8. The plasma treatment device for preparing a fiber-reinforced tape according to claim 7, characterized in that: The upper electrode plate and the lower electrode plate are made of copper, aluminum or silver, and the structures of the upper electrode plate and the lower electrode plate are plate-like structures, mesh structures or thin-film coating structures.

9. The plasma treatment device for preparing a fiber-reinforced tape according to claim 7, characterized in that: The upper ceramic insulating plate and the lower ceramic insulating plate are made of alumina, beryllium oxide, boron nitride or aluminum nitride ceramics, the thickness of the upper ceramic insulating plate and the lower ceramic insulating plate is 1.0-2.0 mm, and the spacing between the upper ceramic insulating plate and the lower ceramic insulating plate is 1.0-2.0 mm.

10. A processing method of a plasma processing device for preparing a fiber-reinforced tape according to any one of claims 1 to 9, characterized in that The following steps are involved: After the reinforcing fibers pass through three spreading convex rollers, the width of the reinforcing fibers is spread to 20-50 mm, and then the reinforcing fibers enter the plasma treatment device; The main gas inlet and the secondary gas inlet continuously introduce a mixed gas, which includes argon, oxygen and nitrogen, and the total filling rate of the mixed gas is 0.5-0.7L / min; The mixed gas is blocked in the flow blocking chambers of the front flow blocking device and the rear flow blocking device in the plasma processing device; The power frequency of the plasma generator is 2.0-5.0KHz, the voltage is 100-200V, and the speed of the reinforcing fiber in the plasma generator is 1.5-2.5m / min; The plasma treatment device inserts a ceramic insulating plate between high-frequency and high-voltage electrode plates to generate high-energy particles to micro-etch the surface of the reinforcing fibers.

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