Carbon fiber jet plasma surface treatment device for prepreg machine equipment

Abstract

The invention provides a carbon fiber jet plasma surface treatment device for prepreg machine equipment. The carbon fiber jet plasma surface treatment device comprises a fixed base, a console, a pneumatic device, a fabric roller, a gas channel, an upper pneumatic lifting system, an upper rotating nozzle, an upper mirror roller, a lower mirror roller, a yarn guide roller, a lower rotating nozzle, a lower pneumatic lifting system, a main rack, an alarm device and the like. Wherein the upper rotary spray head and the lower rotary spray head are core devices of the device, and each rotary spray head comprises a ground wire connector, a power connector, a plasma spray gun, a rotary gas chamber, a jet flow channel and a transparent jet flow channel. The carbon fiber surface treatment device can emit plasma jet flow to perform surface treatment on carbon fibers in the prepreg production process, and the purposes of improving the interface performance of the carbon fibers and resin and improving the bonding strength of the resin and the carbon fibers are achieved. The maximum breadth of the applicable prepreg production is 1200mm, and the speed of the applicable prepreg production line is 1m / min to 20m / min.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber prepreg production, and specifically to a plasma surface treatment device that can improve the interfacial performance between resin and carbon fiber during the prepreg production process. Background Art

[0002] Composites prepared from carbon fiber prepregs are widely used in industries such as automobiles, aerospace, etc. due to their characteristics of light weight, high strength and modulus, and excellent corrosion resistance. However, due to the poor interfacial bonding performance between some resins (such as phenolic resin, thermoplastic resin) and carbon fiber, in the preparation of prepregs and composites, poor wetting of resin and fiber is likely to occur, and problems such as fiber debonding are likely to occur during the use of composites, affecting the performance of composites and the performance of fibers.

[0003] Plasma technology can ionize electrons in a gas environment, excite reactive gases to generate active particles, cause changes in the microstructure and roughness of the carbon fiber surface, and increase polar groups (such as carboxyl groups, hydroxyl groups, lactones, etc.) on the carbon fiber, thereby changing the surface characteristics of the carbon fiber. Due to its characteristics of simple operation, environmental protection in the process, short modification time, and low damage to fibers, it has been gradually applied to the modification treatment of carbon fibers. Patents such as CN113912983A and CN116694075A have used plasma treatment devices to perform surface treatment on carbon fibers to modify the carbon fibers, and then compound the modified carbon fibers with resin to further make composites. The performance of the obtained composites has been significantly improved, and good results have been achieved. However, the above-mentioned methods for carbon fiber surface treatment are usually simple fiber treatments and cannot be applied to prepreg production. In addition, carbon fiber fluff will be generated when carbon fiber is subjected to friction during yarn guiding and stretching. When using the most widely used electrode plate type plasma surface treatment device to treat carbon fiber materials, the carbon fiber fluff will wind around or adsorb on the surface of the electrode plate, greatly affecting the treatment efficiency of carbon fiber plasma. Moreover, carbon fiber has good electrical conductivity, and the carbon fiber fluff wound around the electrode surface will also cause problems such as flashover, affecting the service life of the equipment and threatening production safety. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a carbon fiber spraying plasma surface treatment device for a prepreg machine, which solves the problem of low interfacial bonding degree when carbon fiber is compounded with some resins with poor interfacial performance. And this device can be combined with the prepreg machine to realize batch preparation of carbon fiber prepregs, solving the problems raised in the above background art.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: A carbon fiber jet plasma surface treatment device for a prepreg machine is provided. The jet plasma surface treatment device can be combined with the prepreg machine, and a plasma treatment process is added during the traditional prepreg production process to modify the carbon fiber during the prepreg production process, so as to improve the interfacial performance between the carbon fiber and the resin and enhance the bonding strength between the resin and the carbon fiber.

[0006] The carbon fiber jet plasma surface treatment device for a prepreg machine can modify the carbon fiber under normal temperature and pressure, thereby activating the carbon fiber surface, enhancing the surface activity of the carbon fiber, increasing the interfacial contact area between the carbon fiber and the resin, and improving the wettability and interfacial bonding performance between the carbon fiber and the resin in the subsequent process.

[0007] The carbon fiber jet plasma surface treatment device for a prepreg machine includes a fixed base, a control console, a pneumatic device, a fabric roller, a gas channel, an upper pneumatic lifting system, an upper rotating nozzle, an upper mirror roller, a lower mirror roller, a yarn guiding roller, a lower rotating nozzle, a lower pneumatic lifting system, a main frame, an alarm device, and other components.

[0008] The fixed base is composed of two jaw-shaped fixing devices and a connecting truss, and the material is one of fine steel, Q235 steel, and alloy steel. Three M20 bolt holes are opened under the fixed base, and bolts can be used to connect the fixed base to the frame of the prepreg machine, so that the jet plasma surface treatment device described in the present invention can be applied to the prepreg machine.

[0009] The control console includes a touch screen, start, stop, emergency stop buttons, and a servo motor. Through the touch screen, the control console can realize the operation and control of the overall jet plasma device, including but not limited to: adjusting the lifting of the opening and closing cylinder, adjusting the output power, adjusting the linear speed of each roller, adjusting the rotation speed of the rotating nozzle, adjusting the power of the gas channel, and other functional operations. The start button can control the startup of the whole machine; the stop button can control the stop of the whole machine; the emergency stop button can quickly terminate the operation of the whole machine in case of an emergency; the servo motor is integrated on one side of the control console and is used to drive the rotation of the upper mirror roller and the lower mirror roller.

[0010] The pneumatic device mentioned above is a single-acting cylinder with an up-and-down stroke of 100 mm. The working medium is compressed air, and the working pressure is 0.15 - 0.8 MPa. They are respectively installed on the frames on both sides of the upper pneumatic lifting system and the lower pneumatic lifting system, with one on each of the left and right sides of each pneumatic lifting system, for a total of four pneumatic devices. The pneumatic devices can be controlled through a console. When starting, the pneumatic devices drive the upper pneumatic lifting system and the lower pneumatic lifting system to move up and down respectively, for adjusting the distance between the plasma jet and the carbon fiber surface and for threading during shutdown.

[0011] The actual effective length of the roller surface of the fabric roller is 1300 mm, the roller diameter is Φ80 mm, and the roller surface material is a covered rubber roller, which consists of an aluminum alloy metal inner core and an outer rubber covering the roller surface. This structure combines the strength and rigidity of the metal and the elasticity, wear resistance, and anti-slip properties of the rubber, enabling the fabric to be unrolled with a stable tension.

[0012] The gas passage cylinder has a diameter of Φ110 mm, is made of polytetrafluoroethylene, and has an adjustable power of 1000W - 3000W. It mainly serves to provide a gas atmosphere inside the upper rotating nozzle and the lower rotating nozzle.

[0013] The upper pneumatic lifting system and the lower pneumatic lifting system are respectively installed above the upper mirror roller and below the lower mirror roller, and are internally provided with a control circuit connected to the console. The pneumatic lifting system provides an installation slot and a power supply function for the rotating nozzle. There are 5 - 7 rotating nozzles installed in the upper pneumatic lifting device and the lower pneumatic lifting device respectively. In addition, by controlling the stroke of the pneumatic device through the console, the distance between the pneumatic lifting system and the mirror roller can be controlled, and thus the distance from the rotating nozzle to the carbon fiber can be controlled to achieve different treatment effects.

[0014] The upper rotary nozzle and the lower rotary nozzle described above are the core devices of the invention, which are composed of a ground wire connector, a power connector, a plasma spray gun, a rotary gas chamber, a jet channel, and a transparent jet channel. The ground wire connector and the power connector are connected to the relevant circuits in the pneumatic lifting system, and the power of a single rotary nozzle can be adjusted from 10W to 500W; the plasma spray gun is fixed above the rotary gas chamber by a bracket, with a jet frequency of 8MHz - 12MHz, and can eject a plasma jet into the gas in the rotary gas chamber to generate a plasma gas atmosphere, and the jet intensity can be adjusted according to the change of the power; the rotary gas chamber is provided with air flow by the gas channel, and the air flow direction is from the plasma spray gun to the jet channel. The rotary gas chamber is connected to the jet channel by bonding and can drive the jet channel to rotate at a speed of 100r / min - 1000r / min to form a plasma gas atmosphere jet. The diameter of the thick end of the rotary gas chamber is Φ110mm, the diameter of the thin end is Φ85mm, and the height is 80mm; the diameter of the jet channel barrel is Φ85mm and the height is 120mm, which serves to provide a channel for the jet and protection; the transparent jet channel is mechanically connected to the jet channel, with a barrel diameter of Φ85mm and a height of 120mm, and the material is glass fiber reinforced epoxy resin material and can rotate together with the jet channel. The transparent jet channel can be used to observe the state of the plasma jet and better adjust the distance between the rotary nozzle and the carbon fiber.

[0015] The diameters of the upper mirror roller and the lower mirror roller described above are Φ150mm, the material is steel chrome-plated, the hardness is greater than or equal to 60HRC, and the thickness of the chrome layer is ≥80μm, and the roller length is 1300mm. The upper mirror roller and the lower mirror roller are driven by a servo motor to rotate, and the rotation speed can be adjusted from 1r / min to 100r / min. When the equipment is running, the carbon fiber first passes through the upper mirror roller to process the upper surface of the carbon fiber, and then passes through the lower mirror roller to process the lower surface of the carbon fiber, so as to achieve the purpose of fully processing the carbon fiber.

[0016] The diameter of the yarn guiding roller is Φ80mm, the roller length is 1300mm, and the roller surface material is a coated rubber roller, and its function is to introduce the processed carbon fiber into the subsequent prepreg production process.

[0017] The overall height of the main frame is 720mm, the width is 1440mm, and the thickness is 5mm. The material is one of fine steel, Q235 steel, and alloy steel. Multiple screw holes, grooves, etc. are opened on the main frame according to the requirements of each basic component of the plasma spraying surface treatment device to provide support for the entire plasma spraying surface treatment device.

[0018] The described alarm device can emit an alarm sound and turn on a red alarm light when problems occur in the equipment, including but not limited to carbon fiber winding, abnormal contact of the device, abnormal rotation, and other abnormalities. When the equipment is emergently stopped, a red light will also turn on and an automatic alarm will be triggered, and the alarm will stop after the emergency stop is reset.

[0019] Preferably, the pneumatic device can have an opening and closing protection function, which can avoid equipment friction and excessive opening and closing when lifting and lowering the pneumatic lifting device.

[0020] Preferably, the plasma source of the plasma spray gun is one of a plasma torch source, a pulsed plasma source, an arc plasma torch, a helical tube plasma source, and an atmospheric pressure plasma jet source.

[0021] Preferably, exhaust systems can be configured on both sides of the upper mirror roller and the lower mirror roller to ensure a constant air flow and processing effect.

[0022] Preferably, the rotating gas chamber can be adapted to various gases such as air, nitrogen, and argon.

[0023] Preferably, the transparent jet channel is at the end of the plasma jet. At this time, the jet energy of the plasma spray gun is weakened, so fiberglass is selected as the material. To enhance its protection ability, quartz glass, high-entropy transparent ceramics, etc. can also be selected as the substrate.

[0024] Preferably, the jet channel and the transparent jet channel can be replaced regularly.

[0025] Preferably, the upper mirror roller and the lower mirror roller should be equipped with a roller stop protection device.

[0026] Preferably, an electrostatic removal device can be installed behind the yarn guide roller to remove the static electricity on the surface of the yarn after being drawn.

[0027] Compared with the prior art, the positive effects of the present invention are:

[0028] 1. The plasma spraying surface treatment device described in the present invention can be combined with a prepreg machine equipment, which can realize the surface treatment and modification of carbon fiber tows and fabrics during the prepreg production process, improve the interfacial bonding performance between carbon fiber and resin, and enable batch production.

[0029] 2. The plasma spraying surface treatment described in the present invention avoids the too-close distance between carbon fiber and the electrode when treating carbon fiber, reduces the carbon fiber fluff generated by the friction between carbon fiber and the equipment, and due to the existence of the plasma jet airflow, avoids the winding of carbon fiber fluff on the surface of the electrode, improves the surface treatment efficiency of carbon fiber and reduces the production risk.

[0030] 3. The jet plasma surface treatment device described in the present invention can enable the carbon fiber to directly enter the subsequent prepreg production process through the yarn guide roller after being treated, reducing the problem of inactivation caused by the long-term exposure of the carbon fiber to the air after plasma treatment. Description of the Drawings

[0031] Figure 1 The structure schematic diagram of a carbon fiber jet plasma surface treatment device for a prepreg machine according to the present invention, which includes a fixed base 1, a console 2, a pneumatic device 3, a fabric roller 4, a gas channel 5, an upper pneumatic lifting system 6, an upper rotary nozzle 7, an upper mirror roller 8, a lower mirror roller 9, a yarn guide roller 10, a lower rotary nozzle 11, a lower pneumatic lifting system 12, a main frame 13, and an alarm device 14.

[0032] Figure 2 The structure and operation principle schematic diagram of the core devices 7 upper rotary nozzle and 11 lower rotary nozzle of the present invention, which includes carbon fiber 15, a ground wire joint 16, a power supply joint 17, a gas source 18, a plasma spray gun 19, a rotary gas chamber 20, a jet channel 21, a plasma jet 22, and a transparent jet channel 23. Specific Embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only used as examples and cannot be used to limit the protection scope of the present invention.

[0034] Embodiment 1

[0035] As Figure 1 shown, a carbon fiber jet plasma surface treatment device for a prepreg machine, the jet plasma surface treatment device includes a fixed base 1, a console 2, a pneumatic device 3, a fabric roller 4, a gas channel 5, an upper pneumatic lifting system 6, an upper rotary nozzle 7, an upper mirror roller 8, a lower mirror roller 9, a yarn guide roller 10, a lower rotary nozzle 11, a lower pneumatic lifting system 12, a main frame 13, and an alarm device 14. The specific implementation process is as follows.

[0036] (1) A carbon fiber jet plasma surface treatment device for a prepreg machine needs to be fixed to the frame of the prepreg machine through the fixed base 1. When fixing, it is necessary to ensure that the height difference between the yarn guide roller and the yarn guide channel in the prepreg machine equipment is less than ±10 cm.

[0037] (2) Use the console 2 to turn on the machine, set the stroke of the pneumatic device 3 to the maximum, and control the pneumatic device 3 to drive the upper pneumatic lifting system 6 and the lower pneumatic lifting system 12 to rise and fall respectively for carbon fiber threading.

[0038] (3) Thread the unwound carbon fiber yarn. First, pass it over the upper surface of the 8 upper mirror rollers and then enter the lower surface of the 9 lower mirror rollers. Finally, lead it out through the 10 yarn guide rollers. During yarn guiding, the rotational speeds of the 8 upper mirror rollers and the 9 lower mirror rollers can be adjusted to a linear speed of 0.5 m / min through the 2 control console to provide a certain traction force for threading. When carbon fiber fabric needs to be processed, the carbon fiber fabric can be placed on the 4 fabric rollers for threading, and the remaining steps are the same as the above carbon fiber yarn threading process.

[0039] (4) Run the carbon fiber yarn after threading in the production line at a linear speed of 0.5 m / min for 10 s - 30 s until the tension distribution of the carbon fiber yarn is uniform. After normal operation, use the 2 control console to open the 5 gas channel, adjust the power to 1000 W. After hearing the airflow sound, start the rotational speeds of the 7 upper rotating nozzles and the 11 lower rotating nozzles to 100 r / min and turn on the power of the 7 upper rotating nozzles and the 11 lower rotating nozzles to the minimum of 10 W, and observe whether there is a plasma jet airflow generated from each rotating nozzle.

[0040] (4) After confirming that there is a plasma jet airflow generated from each rotating nozzle, adjust the power of the 5 gas channel to 2000 W to ensure sufficient gas. Further adjust the 7 upper rotating nozzles and the 11 lower rotating nozzles to the corresponding rotational speeds and corresponding powers for the carbon fiber to be processed.

[0041] (5) After adjusting each rotating nozzle, use the 2 control console to control the movement of the 6 upper pneumatic lifting system and the 12 lower pneumatic lifting system, drive the 7 upper rotating nozzles and the 11 lower rotating nozzles to be 3 cm - 5 cm away from the carbon fiber to be processed, and further control the rotational speeds of the 8 upper mirror rollers and the 9 lower mirror rollers to the linear speed corresponding to the corresponding processing frequency, and the surface treatment of carbon fiber by plasma spraying starts.

[0042] (6) Preferably, the power setting of the 11 lower rotating nozzles should be slightly higher than that of the 7 upper rotating nozzles to ensure the uniformity of the treatment effect.

[0043] (7) Such as Figure 2As shown in the figure, the working principles of the upper rotating nozzle and the lower rotating nozzle of the core device 7 of a carbon fiber jet plasma surface treatment device for a prepreg machine according to the present invention are as follows: It includes 15 carbon fibers, 16 ground wire connectors, 17 power supply connectors, 18 gas sources, 19 plasma guns, 20 rotating gas chambers, 21 jet channels, 22 plasma jet streams, and 23 transparent jet channels. In the rotating nozzle, the 16 ground wire connector and the 17 power supply connector are connected to the ground wire and the power supply wire in the pneumatic lifting device to make each rotating nozzle an independent path. When the rotating nozzle works, the 19 plasma gun will emit the 22 plasma jet stream, and the plasma jet stream will ionize the gas entering the 20 rotating gas chamber from the 18 gas source to generate a plasma gas atmosphere. The generated plasma gas atmosphere forms a plasma air flow under the action of the rotational centrifugal force of the 20 rotating gas chamber. The formed plasma air flow acts on the 15 carbon fibers together with the 22 plasma jet stream through the 21 jet channel and the 23 transparent jet channel to achieve the purpose of surface treatment of the carbon fibers.

[0044] (8) Preferably, in order to obtain a better treatment effect, nitrogen can be selected as the gas atmosphere.

[0045] (9) The treated carbon fibers enter the subsequent production process of the prepreg through the 10 yarn guiding rollers, and the treatment is completed.

[0046] In summary, the carbon fiber jet plasma surface treatment device for a prepreg machine according to the present invention can be combined with the prepreg machine device, and is applicable to the production of prepregs of various carbon fiber products such as small tow carbon fibers, large tow carbon fibers, and carbon fiber fabrics (plain weave, twill weave). The maximum applicable width of the prepreg production is 1200 mm, and the applicable production line speed is 1 - 20 m / min for carbon fiber surface modification work, improving the interfacial adhesion performance between the resin and the carbon fiber. Moreover, compared with the electrode plate type plasma treatment device, the carbon fiber jet plasma surface treatment device for a prepreg machine according to the present invention reduces the inactivation of carbon fibers after treatment and can more efficiently and safely achieve the plasma surface treatment of carbon fibers.

[0047] Although the embodiments of the present invention have been shown and described, it is not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A carbon fiber jet plasma surface treatment device for a prepreg machine equipment. The jet plasma surface treatment device can be combined with the prepreg machine equipment to add a plasma treatment process during the prepreg production process, so as to realize the modification treatment of carbon fiber during the prepreg production process, achieve the purpose of improving the interfacial performance between carbon fiber and resin, and enhancing the bonding strength between resin and carbon fiber.

2. The carbon fiber spraying plasma surface treatment device for a prepreg machine equipment according to claim 1, wherein, The jet plasma surface treatment device can be applicable to the prepreg production of various carbon fiber products such as small tow carbon fiber, large tow carbon fiber, and carbon fiber fabric (plain weave, twill). The maximum applicable prepreg production width is 1200 mm, and the applicable prepreg production line speed is 1 m - 20 m / min.

3. A carbon fiber spraying plasma surface treatment device for a prepreg machine equipment according to claim 1. It is characterized in that, It consists of a fixed base, a control console, a pneumatic device, a fabric roller, a gas channel, an upper pneumatic lifting system, an upper rotating nozzle, an upper mirror roller, a lower mirror roller, a yarn guiding roller, a lower rotating nozzle, a lower pneumatic lifting system, a main frame, an alarm device, etc. Among them, the fixed base mainly provides the function of connecting the jet plasma surface treatment device with the prepreg machine equipment; the control console is the control center of the jet plasma surface treatment device, which can realize various controls such as starting, stopping, and operating the jet plasma surface treatment device; the pneumatic device can drive the upper pneumatic lifting system and the lower pneumatic lifting system to move, so as to control the treatment distance of the plasma jet to the carbon fiber surface; the fabric roller and the yarn guiding roller mainly play the role of guiding the fabric and the yarn; the gas channel provides a gas atmosphere for the jet plasma surface treatment device; the upper rotating nozzle and the lower rotating nozzle are the core devices for jetting plasma, which can generate jet plasma jets; the upper mirror roller and the lower mirror roller can drive the yarn to move and play a traction role; the main frame provides an overall support for each component of the jet plasma surface treatment device; the alarm device mainly provides functions of equipment failure alarm and emergency stop alarm.

4. The pneumatic device according to claim 3, characterized in that, It is a single-acting cylinder, with an upper and lower stroke of 100 mm, the working medium is compressed air, and the working pressure is 0.15 - 0.8 MPa.

5. The fabric roller and the yarn guiding roller according to claim 3, characterized in that, The actual effective length of the roller surface is 1300 mm, the roller diameter is Φ80 mm, and the roller surface material is a covered rubber roller.

6. The gas passage according to claim 3, wherein The cylinder diameter is Φ110 mm, the material is polytetrafluoroethylene, and the power is adjustable from 1000 W to 3000 W.

7. The upper rotating nozzle and the lower rotating nozzle according to claim 3, characterized in that The power of a single rotating nozzle is 10 W - 500 W, the jet frequency is 8 MHz - 12 MHz, and the rotation speed is adjustable from 100 r / min to 1000 r / min.

8. The upper mirror roller and the lower mirror roller according to claim 3, characterized in that, The diameter of the roller is Φ150 mm, the material is steel chromium plating, the hardness is greater than or equal to 60 HRC, the chromium layer thickness is greater than or equal to 80 μm, and the roller length is 1300 mm.

9. The main frame according to claim 3, characterized in that The overall height of the main frame is 720 mm, the width is 1440 mm, the thickness is 5 mm, and the material is one of fine steel, Q235 steel, and alloy steel.

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