Low-temperature plasma double-sided processing device for organic fibers in prepreg equipment

Abstract

The invention provides a low-temperature plasma double-sided processing device for organic fibers in prepreg equipment. The low-temperature plasma double-sided processing device comprises a high-voltage transformer, an ozone-discharging cooling fan, a pipeline, a dynamic balance high-hardness guide roller, an opening and closing cylinder, a low-temperature plasma processing station, a pneumatic processing station rack, an electrical cabinet and a supporting bracket. Wherein the low-temperature plasma treatment station is a core device of the device and comprises a dynamic balance discharge roller, discharge assemblies, an electrode assembly and the like, each discharge unit comprises 5-7 discharge assemblies, and the surface treatment can be carried out on organic fibers, so that the interface performance of the organic fibers and resin is improved; and the bonding strength of the resin and the organic fiber is improved. The maximum breadth of the applicable prepreg production is 700mm, and the speed of the applicable prepreg production line is 1m / min to 8m / min.

Description

Technical Field

[0001] The present invention relates to the technical field of organic fiber prepreg production, in particular to a low-temperature plasma double-sided treatment device capable of improving the interface performance between resin and organic fiber in the prepreg during the prepreg production process. Background Art

[0002] Composite materials made from prepregs of organic fibers (such as polyimide, aramid, and ultra-high molecular weight polyethylene) offer excellent properties such as lightweight, high specific strength and modulus, and impact resistance, and are widely used in industries such as special protection and aerospace. However, due to the smooth surface and chemical inertness of organic fibers, insufficient impregnation of the organic fibers with the resin can occur during prepreg production and composite molding. This can lead to deterioration in the composite's interface properties after curing and debonding between the organic fibers and the resin, compromising the composite's mechanical properties.

[0003] Atmospheric pressure low-temperature plasma technology has been widely used in the fields of electronic packaging, industrial coating, etc. due to its simple operation, no need for vacuum environment, low temperature and high efficiency, and low damage, and has been gradually applied to fiber modification processes. Low-temperature plasma technology can ionize electrons in the gas environment, excite the reaction gas to produce active particles, cause changes in the microstructure of the organic fiber surface and increase polar groups, thereby changing the surface properties of the organic fiber. Patent CN117866379A uses atmospheric pressure plasma to treat and modify organic fibers and further prepare composite materials, but it is only suitable for treating a small amount of fibers and is difficult to mass produce. Patent CN119265926A discloses a method for treating organic fibers with oxygen atmosphere plasma to activate the fiber surface and compound with epoxy resin to prepare a composite material. However, if the treated organic fibers are not compounded with the resin in time, the treated fibers are easily deactivated and contaminated, which seriously affects the effect of the surface treatment. Summary of the Invention

[0004] To address the aforementioned issues with the existing technology, the present invention provides a low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment. This device addresses the issue of poor interfacial bonding after composite resin bonding, often caused by the smooth surface and chemical inertness of organic fibers. Combined with the prepreg equipment, this device enables batch double-sided modification of organic fibers during prepreg production, maximizing surface treatment effectiveness and resolving the aforementioned issues raised in the background art.

[0005] The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment can modify organic fibers at room temperature and pressure, without the need for a specific gas medium. It has low processing costs and good processing efficiency, making it suitable for mass production. The organic fibers include, but are not limited to, polyimide fibers, aramid fibers, and ultra-high molecular weight polyethylene. Fabrics include, but are not limited to, unidirectional fabrics, plain fabrics, twill fabrics, and satin fabrics. Resins used to prepare prepregs include, but are not limited to, epoxy resins, bismaleimide resins, polyimide resins, and phenolic resins.

[0006] The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment includes a high-voltage transformer, an ozone exhaust cooling fan and pipeline, a dynamically balanced high-hardness guide roller, an opening and closing cylinder, a low-temperature plasma treatment station, a pneumatic treatment station frame, an electrical cabinet, a support bracket and other devices.

[0007] The high-voltage transformer consists of two digital low-temperature plasma power supplies, two low-temperature plasma pulse transformers, and a high-voltage shield. A digital low-temperature plasma power supply and a low-temperature plasma pulse transformer form a group that can provide high-voltage power for a low-temperature plasma processing station. The output power of the digital low-temperature plasma power supply ranges from 500W to 2500W; the voltage regulation range of the low-temperature plasma pulse transformer is from 0.5kV to 30kV; and the high-voltage shield is made of copper, aluminum, or corrosion-resistant stainless steel. It is primarily based on the Faraday cage principle, and through surface charge redistribution and grounding design, it isolates external electromagnetic interference and ensures the stability of the transformer's internal electromagnetic environment.

[0008] The ozone exhaust cooling fan and piping exhaust the byproduct gases (primarily ozone) generated by the low-temperature plasma processing station into the ventilation duct, ensuring the safety of personnel on the production site. The cooling fan power is adjustable from 1000W to 4000W. The ozone exhaust cooling fan and piping are equipped with a turbocharger with a power of 1200W.

[0009] Preferably, in order to obtain better ozone treatment effects, an ozone treatment device and scheme can be configured, and one of the schemes of thermal decomposition, electron wave radiation decomposition, liquid absorption decomposition, and precious metal catalyst decomposition can be used to effectively treat ozone.

[0010] Preferably, the ozone exhaust cooling fan and pipeline are made of polytetrafluoroethylene.

[0011] There are three to five dynamically balanced, high-hardness guide rollers, located at the front and rear of the low-temperature plasma double-sided treatment unit, depending on threading requirements. These rollers consist of a silicone sleeve and a metal guide roller. The silicone sleeve is 700mm long and 100mm in diameter, meeting the threading requirements of different materials. The metal guide rollers are the same length as the pneumatic treatment station frame and have a diameter of 20mm.

[0012] Preferably, static electricity removal devices can be installed before and after the dynamic balance high hardness guide roller.

[0013] There are four opening and closing cylinders, two for each low-temperature plasma processing station. These cylinders consist of single-acting cylinders and travel positioning brackets. The single-acting cylinders operate at a pressure of 0.3-1 MPa and are mounted on the pneumatic processing station frame on either side of the dynamic balancing discharge roller in the low-temperature plasma processing station. The travel positioning brackets are mounted on one side of the single-acting cylinders and connected to the single-acting cylinders via floating joints, providing travel direction and position limiting for the single-acting cylinders. The travel positioning brackets have a maximum travel of 100 mm.

[0014] Preferably, the opening and closing cylinder is provided with a sensor, and has the functions of opening and closing protection and roller stop protection.

[0015] The low-temperature plasma processing station includes a dynamic balancing discharge roller, a discharge assembly, an electrode assembly and other devices. The dynamic balancing discharge roller is 700mm long and has a diameter of Φ150mm. The electrode assembly contains 5-7 discharge assemblies, which provide support and power supply for the discharge assemblies. The discharge assembly includes a round tube corundum ceramic electrode and an electrode cooler. The round tube corundum ceramic electrode is 700mm long and has a diameter of Φ25mm, and plays the main discharge role. The electrode cooler is 700mm long and has a diameter of Φ25mm, and prevents the temperature around the electrode from being too high and cools it down in real time, so that the plasma processing temperature is lower than 80°C.

[0016] The pneumatic processing station frame provides component installation and support for the low-temperature plasma double-sided processing device. It is 1305mm long, 540mm wide, and 720mm high. It is made of one of fine steel and alloy steel. The pneumatic processing station frame is equipped with multiple screw holes, installation supports, etc. according to the requirements of each component of the low-temperature plasma double-sided surface treatment device.

[0017] The electrical cabinet houses an industrial computer for controlling the low-temperature plasma double-sided processing device. It also includes a PCL, a touch screen, and supporting industrial software. The electrical cabinet can be placed separately on one side of the low-temperature plasma double-sided processing device and connected to the device via electrical equipment. The cabinet includes buttons for powering on the cabinet, starting the entire device, stopping the entire device, and performing an emergency stop. These buttons control functions such as powering on the cabinet, starting and stopping all lines, and performing emergency stops on the low-temperature plasma double-sided processing device.

[0018] Preferably, the electrical cabinet includes a fault alarm function. When an emergency stop is performed or a device fails, the alarm device will make a sound and light up to alarm.

[0019] The support bracket provides support and height adjustment for the low-temperature plasma double-sided processing device. The support bracket is 830mm high and 540mm wide. It also has height adjustment feet with an adjustment range of ±10mm.

[0020] Compared with the prior art, the present invention has the following positive effects:

[0021] 1. The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment described herein can be integrated with prepreg equipment to perform batch surface modification of organic fiber tows and fabrics during prepreg production, improving the interfacial bonding between the organic fibers and the resin. This can effectively reduce the deactivation of organic fibers caused by prolonged exposure to air after plasma treatment.

[0022] 2. The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment described in the present invention can achieve good treatment effects in air without the need for a specific gas atmosphere. In addition, its plasma treatment temperature is lower than 80°C, which causes little damage to the mechanical properties of the organic fibers. It has the advantages of low cost, high treatment efficiency and little damage to the performance of the organic fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine according to the present invention, comprising 1 high-voltage transformer, 2 rows of ozone cooling fans and pipelines, 3 dynamically balanced high-hardness guide rollers, 4 opening and closing cylinders, 5 low-temperature plasma treatment stations, 6 pneumatic treatment station racks, and other devices.

[0024] Figure 2 This is a structural diagram of the high-voltage transformer 1 described in the present invention, which includes 7 low-temperature plasma pulse transformer, 8 digital low-temperature plasma power supply, 9 high-voltage shielding cover and other devices.

[0025] Figure 3 This is a structural schematic diagram of the two rows of ozone cooling fans and pipelines described in the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the 3 dynamically balanced high-hardness guide rollers described in the present invention, including 10 silicone sleeves, 11 metal guide rollers and other parts.

[0027] Figure 5 This is a schematic diagram of the structure of the 4 opening and closing cylinders described in the present invention, including 12 stroke positioning brackets, 13 single-acting cylinders and other parts.

[0028] Figure 6 Schematic diagram of the structure of the low-temperature plasma processing station 5 of the present invention, including 14 dynamic balance discharge rollers, 15 discharge components, 16 electrode assembly and other devices.

[0029] Figure 7 This is a schematic diagram of the structure of the 6-pneumatic processing station rack described in the present invention.

[0030] Figure 8 Schematic diagram of an electrical cabinet 17 for controlling a low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine according to the present invention, including devices and functions such as electrical cabinet opening 18, whole machine opening 19, whole machine stop 20, emergency stop 21, touch screen 22, and fault alarm 23.

[0031] Figure 9 This is a schematic diagram of the structure of 24 support brackets for supporting a low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine according to the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are therefore only used as examples and cannot be used to limit the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, a schematic diagram of the overall structure of a low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine is shown, which includes 1 high-voltage transformer, 2 rows of ozone cooling fans and pipelines, 3 dynamically balanced high-hardness guide rollers, 4 opening and closing cylinders, 5 low-temperature plasma treatment stations, 6 pneumatic treatment station racks and other devices.

[0035] (1) A low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine is used through 24 support brackets. When the low-temperature plasma double-sided treatment device is used, it is first necessary to adjust it to a position flush with the feed port of the prepreg machine with an error of ≤±20mm.

[0036] (2) Turn on the power of the electrical cabinet 17 and turn on the power button of the electrical cabinet 18 to turn on the control system of the equipment; the equipment can be operated through the touch screen 22 to set the line speed, processing power, equipment start and stop settings, cylinder opening and closing settings, ozone exhaust settings, etc.

[0037] (3) Control the 4 opening and closing cylinders to their maximum stroke through the 22 touch screen, set the whole machine line speed of the low-temperature plasma double-sided treatment device to 0.5m / min, and press the 19 whole machine start button on the 17 electrical cabinet to provide a certain traction for threading. Then perform the threading operation. First, the organic fiber after yarn spreading passes through the 3 dynamic balance high hardness guide rollers on the front side of the low-temperature plasma double-sided treatment device, the 14 dynamic balance discharge rollers in the two middle 5 low-temperature plasma treatment stations, and then the organic fiber is drawn out from the 3 dynamic balance high hardness guide rollers on the front side of the low-temperature plasma double-sided treatment device. After the yarn to be spread passes through the low-temperature plasma double-sided treatment device continuously for about 1min-2min and the spread yarn is observed to be relatively evenly distributed, the opening and closing cylinders are controlled through the 22 touch screen to drive the 14 dynamic balance discharge rollers to move, so that the gap between the 14 dynamic balance discharge rollers and the 15 discharge assembly and the 16 electrode assembly reaches the preset processing gap. Depending on the processing power, the processing gap is usually set between 3mm-20mm. The higher the processing power, the smaller the gap. The gap can be appropriately increased at low power.

[0038] like Figure 5 As shown in the figure, the working principle of the 4 opening and closing cylinders is that compressed air drives the piston inside the cylinder body of the single-acting cylinder 13 to reciprocate and open and close, driving the dynamic balance discharge roller 15 to move along the stroke positioning bracket 12. The 12 stroke positioning bracket provides the movement direction and stroke limit for the 4 opening and closing cylinders.

[0039] Preferably, the 4 opening and closing cylinders will have opening and closing protection and roller stop protection to prevent the cylinder stroke from being too large and impacting and damaging the low-temperature plasma double-sided processing device.

[0040] (4) Turn on the 2 rows of ozone cooling fans and pipelines through the 22 touch screen. First, turn the power to the lowest level to ensure that the ozone cooling fans can operate normally.

[0041] (5) Turn on the switch of the digital low-temperature plasma power supply 8 in the high-voltage transformer 1 to provide high-voltage power for the entire low-temperature plasma double-sided processing device.

[0042] (6) The processing power and processing frequency of the low-temperature plasma processing station are set through the 22 touch screen 5, and are reasonably set according to the thickness of the organic fiber after the yarn is spread. Generally, the thicker the fiber thickness, the greater the processing power needs to be to ensure that the internal fibers can also obtain a good treatment effect.

[0043] like Figure 6 As shown in Figure 5, the operating principle of the low-temperature plasma treatment station is that multiple discharge assemblies 15 are mounted on an electrode assembly 16. The discharge assemblies 15 are connected to a high-voltage power supply, and the dynamic balanced discharge roller 14 is connected to a low-voltage power supply and a ground wire. During low-temperature plasma treatment, a high-voltage electric field exists between the electrodes of the dynamic balanced discharge roller 14 and the discharge assembly 15. Free electrons are accelerated and collide with air molecules between the dynamic balanced discharge roller 14 and the discharge assembly 15. This process generates a large number of high-energy electrons, active free radicals (such as OH and O3), and charged particles. These active particles etch the surface of organic fibers passing between the dynamic balanced discharge roller 14 and the discharge assembly 15, introducing active functional groups, thereby modifying the surface and improving the bonding between the organic fibers and the resin.

[0044] During the above treatment process, a small amount of ozone by-products will be produced and need to be discharged in time.

[0045] (7) Further, the linear speed of the low-temperature plasma double-sided treatment device is adjusted to a preset speed through the 22 touch screen, and the two rows of ozone cooling fans and pipelines are opened to the preset power to continuously perform the organic fiber surface treatment.

[0046] (8) The treated organic fibers pass through the three dynamic balanced high-hardness guide rollers on the rear side of the low-temperature plasma double-sided treatment device and enter the prepreg subsequent production process, and the treatment is completed.

[0047] (9) If you need to stop the machine, you can press the 20th machine stop button on the 17th electrical cabinet to handle the equipment. If a fault occurs, you can press the 21st emergency stop button on the 17th electrical cabinet to repair the equipment.

[0048] In summary, the low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment described herein can be combined with prepreg equipment and is suitable for the production of prepregs for various organic fibers, including polyimide fibers, aramid fibers, and ultra-high molecular weight polyethylene, as well as organic fiber fabrics. The device can be used for prepreg production with a maximum width of 700 mm and a production line speed of 1-8 m / min. It can perform surface modification on organic fibers during prepreg production, improving the interfacial bonding between the resin and the organic fibers.

[0049] Although the embodiments of the present invention have been shown and described, they are not intended to limit the present invention. Those skilled in the art will appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A low-temperature plasma double-sided treatment device for organic fibers in a prepreg machine. The low-temperature plasma double-sided treatment device needs to be combined with the prepreg machine equipment to achieve batch processing of organic fiber tows or organic fiber fabrics during the prepreg production process, thereby achieving the purpose of improving the interface performance between organic fibers and resin and enhancing the bonding strength between resin and organic fibers.

2. The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment according to claim 1, characterized in that: The low-temperature plasma double-sided treatment device is applicable to, but not limited to, the production of prepregs for a variety of organic fiber products, including polyimide fibers, aramid fibers, and ultra-high molecular weight polyethylene. Fabrics include, but are not limited to, unidirectional fabrics, plain weaves, twill weaves, and satin weaves. Resins for preparing prepregs include, but are not limited to, epoxy resins, bismaleimide resins, polyimide resins, and phenolic resins. The maximum applicable prepreg production width is 700 mm, and the applicable prepreg production line speed is 1-8 m / min.

3. The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment according to claim 1, characterized in that: The low-temperature plasma double-sided treatment device can achieve good treatment effects in air without requiring a specific gas atmosphere. In addition, its plasma treatment temperature is lower than 80°C, which has the advantages of low cost, high treatment efficiency, and little damage to organic fiber properties.

4. The low-temperature plasma double-sided treatment device for organic fibers in prepreg equipment according to claim 1, characterized in that: It includes high-voltage transformer, ozone exhaust cooling fan and pipeline, dynamic balancing high-hardness guide roller, opening and closing cylinder, low-temperature plasma treatment station, pneumatic treatment station frame, electrical cabinet, support bracket and other devices.

5. The high-voltage transformer according to claim 4, characterized in that The device comprises a digital low-temperature plasma power supply, a low-temperature plasma pulse transformer, a high-voltage shielding cover and other devices. The output power range of the digital low-temperature plasma power supply is 500W-2500W; the voltage adjustment range of the low-temperature plasma pulse transformer is 0.5kV-30kV; and the material of the high-voltage shielding cover is copper, aluminum, or corrosion-resistant stainless steel.

6. The ozone exhaust cooling fan and pipeline according to claim 4, characterized in that: The cooling fan and pipeline have an adjustable power of 1000W-4000W. A turbocharger with a power of 1200W is installed inside the ozone exhaust cooling fan and pipeline. The pipeline material of the ozone exhaust cooling fan and pipeline is polytetrafluoroethylene.

7. The dynamically balanced high-hardness guide roller according to claim 4, characterized in that: The dynamically balanced high-hardness guide roller comprises a silicone sleeve and a metal guide roller, wherein the silicone sleeve has a length of 700 mm and a diameter of Φ100 mm; the metal guide roller has the same length as the pneumatic processing station frame and a diameter of Φ20 mm.

8. The low-temperature plasma processing station according to claim 4, characterized in that The low-temperature plasma processing station includes a dynamically balanced discharge roller, a discharge assembly, and an electrode assembly. The dynamically balanced discharge roller is 700 mm long and 150 mm in diameter. The electrode assembly contains 5-7 discharge assemblies. The discharge assembly includes a circular corundum ceramic electrode (700 mm long and 25 mm in diameter) and an electrode cooling system. The circular corundum ceramic electrode is 700 mm long and 25 mm in diameter. The electrode cooling system is 700 mm long and 25 mm in diameter.

9. The pneumatic processing station frame according to claim 4, characterized in that: The pneumatic processing station frame has an overall length of 1305 mm, a width of 540 mm, and a height of 720 mm, and is made of either fine steel or alloy steel.

10. The electrical cabinet according to claim 4, characterized in that The electrical cabinet is equipped with an industrial computer, PLC, touch screen and supporting industrial software; the electrical cabinet includes multiple buttons and corresponding functions such as electrical cabinet start, whole machine start, whole machine stop, emergency stop, etc.

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