Device suitable for carbon fiber surface treatment

Abstract

The utility model provides a device suitable for carbon fiber surface treatment, which comprises an electrolytic bath, anode rollers and guide rollers, at least one anode roller and at least one guide roller are arranged on one side of the electrolytic bath, and at least one guide roller and at least one anode roller are also arranged on the other side of the electrolytic bath. The carbon fiber tow is driven and guided by the anode roller and the guide roller, then enters the electrolytic bath through one side of the electrolytic bath, is subjected to surface treatment in the electrolytic bath and then is guided out from the other side of the electrolytic bath through the guide roller and the anode roller, the electrolytic bath is made of polypropylene or polyvinyl chloride materials, the anode roller adopts an anode graphite roller, and the cathode graphite roller adopts a cathode graphite roller. The guide rollers are made of polytetrafluoroethylene materials. According to the surface treatment device, the problems that metal impurities are introduced into a surface treatment device used in the existing production, the quality of fibers is reduced due to long-term operation and long-term chronic electrochemical corrosion of carbon fiber production equipment is caused are solved.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber processing technology, and specifically to a device suitable for carbon fiber surface treatment. Background Technology

[0002] Carbon fiber is an inorganic fiber with a carbon content of over 90%, mainly classified into three types: polyacrylonitrile-based, pitch-based, and viscose-based. Polyacrylonitrile-based carbon fiber possesses excellent mechanical properties and is widely used in structural and lightweight materials, accounting for over 90% of total carbon fiber production, making it the mainstream product. Based on mechanical properties, polyacrylonitrile-based carbon fiber can be further classified into four categories: high-strength, high-modulus, high-strength medium-modulus, and high-strength high-modulus.

[0003] Carbon fiber, with its excellent properties, is widely used as a reinforcement in resin-based composites. When external force is applied to a carbon fiber composite, the stress is transmitted between the carbon fiber bundles through the matrix material. Carbon fiber itself has a smooth surface, small specific surface area, low surface energy, few surface-active groups, and a hydrophobic surface, which is unfavorable for matrix resin impregnation, resulting in low interfacial strength and affecting the overall excellent performance of the material. Surface treatment increases the number of surface-active groups on the carbon fiber, improves its surface energy, makes it hydrophilic, and increases the chemical bonding force between the carbon fiber and the matrix resin. Furthermore, surface treatment can appropriately increase the surface roughness of the carbon fiber without affecting its tensile strength, transforming the hydrophobic surface of the fiber into a hydrophilic one, improving the interfacial adhesion between the fiber and the matrix resin, promoting the anchoring effect at the interface, and increasing the interlaminar shear strength (ILSS) of the composite. Untreated carbon fiber composites have an ILSS of only 50-60 MPa, which does not meet the requirements; after treatment, the ILSS can be increased to 80-120 MPa. Anodizing results in the formation of numerous oxygen-containing functional groups on the carbon fiber surface, increasing the surface energy of the carbon fiber, especially the polar surface energy. Various oxygen-containing functional groups are formed on the edge carbon atoms, mainly including phenolic hydroxyl, carbonyl, carboxyl, and lactone groups.

[0004] Because existing carbon fiber surface treatment devices have technical problems such as introducing impurities through electrochemical corrosion during surface treatment, this invention designs a device suitable for carbon fiber surface treatment. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of the existing carbon fiber surface treatment device that introduces impurities by electrochemical corrosion during surface treatment, thereby providing a device suitable for carbon fiber surface treatment.

[0006] To address the aforementioned problems, this invention provides an apparatus suitable for carbon fiber surface treatment, comprising:

[0007] Electrolytic cell, anode roller and guide roller, at least one of the anode roller and the guide roller is arranged on one side of the electrolytic cell, and at least one of the guide roller and the anode roller is arranged on the other side of the electrolytic cell, the carbon fiber tow is guided into the electrolytic cell through the anode roller and the guide roller, and is guided out of the electrolytic cell through the guide roller and the anode roller after surface treatment in the electrolytic cell, and the electrolytic cell is made of polypropylene or polyvinyl chloride, the anode roller is made of positive graphite roller, and the guide roller is made of polytetrafluoroethylene.

[0008] In some embodiments,

[0009] The electrolytic cell includes a first electrolytic cell, a second electrolytic cell and a third electrolytic cell, the first electrolytic cell, the second electrolytic cell and the third electrolytic cell are arranged in sequence, the carbon fiber is treated by tow in the first electrolytic cell, the second electrolytic cell and the third electrolytic cell, one anode roller and one guide roller are arranged on the side of the first electrolytic cell away from the second electrolytic cell, two guide rollers and one anode roller are arranged between the first electrolytic cell and the second electrolytic cell, two guide rollers and one anode roller are arranged between the second electrolytic cell and the third electrolytic cell, and one anode roller and one guide roller are arranged on the side of the third electrolytic cell away from the second electrolytic cell, so that the carbon fiber tow enters the first electrolytic cell through the anode roller and the guide roller, the carbon fiber tow from the first electrolytic cell enters the second electrolytic cell through the anode roller and the guide roller, the carbon fiber tow from the second electrolytic cell enters the third electrolytic cell through the anode roller and the guide roller, and the carbon fiber tow from the third electrolytic cell is guided out through the anode roller and the guide roller.

[0010] In some embodiments,

[0011] Further comprising a circulating tank, a circulating pump and a filter screen, the inside of the circulating tank can store liquid, the circulating pump is in communication with the circulating tank, the circulating pump is in communication with the electrolytic cell, and the filter screen is arranged on the pipeline in communication between the circulating pump and the electrolytic cell, so that the circulating pump can pump the liquid into the electrolytic cell after filtering through the filter screen, and the electrolytic cell has electrolyte.

[0012] In some embodiments,

[0013] The filter screen is arranged on the side of the first electrolytic tank away from the second electrolytic tank, and on the side of the third electrolytic tank away from the second electrolytic tank, the circulating pump pumps liquid into the third electrolytic tank through the filter screen on the side of the third electrolytic tank, the first electrolytic tank, the second electrolytic tank and the third electrolytic tank are sequentially connected, the electrolyte on the side of the first electrolytic tank away from the second electrolytic tank is filtered by the filter screen on the side and then by a filter before returning to the circulating tank, and a liquid level meter is further arranged in the circulating tank.

[0014] In some embodiments,

[0015] Further comprising a conductivity meter arranged at the filter screen to detect the conductivity of the electrolyte flowing into the electrolytic tank, the circulating pump is electrically connected with the conductivity meter to adjust the rotating speed of the circulating pump according to the conductivity to control the concentration of the electrolyte in the electrolytic tank.

[0016] In some embodiments,

[0017] Further comprising a pH meter arranged at the filter screen to detect the pH value of the electrolyte flowing into the electrolytic tank, and a pH liquid input device connected with the circulating tank to input pH liquid into the circulating tank, the pH liquid input device is electrically connected with the pH meter to adjust the pH value of the liquid input by the pH liquid input device according to the pH value to control the pH value in the electrolytic tank.

[0018] In some embodiments,

[0019] The pH liquid input device comprises an ammonium bicarbonate circulating pump, an ammonium bicarbonate storage tank and an ammonium bicarbonate proportioning tank, the ammonium bicarbonate proportioning tank is connected with the ammonium bicarbonate storage tank through the ammonium bicarbonate circulating pump, and the ammonium bicarbonate storage tank is connected with the circulating tank through the ammonium bicarbonate circulating pump.

[0020] In some embodiments,

[0021] The pH liquid input device further comprises an ammonium bicarbonate screw feeder, a deionized water pipeline and a throttle valve, the ammonium bicarbonate screw feeder is connected with the ammonium bicarbonate proportioning tank, the deionized water pipeline is also connected with the ammonium bicarbonate proportioning tank, and the throttle valve is arranged on the deionized water pipeline.

[0022] In some embodiments,

[0023] The pH liquid input device comprises a sulfuric acid circulating pump, a sulfuric acid storage tank and a sulfuric acid proportioning tank, the sulfuric acid proportioning tank is communicated with the sulfuric acid storage tank through the sulfuric acid circulating pump, and the sulfuric acid storage tank is communicated with the circulating tank through the sulfuric acid circulating pump.

[0024] In some embodiments,

[0025] The pH liquid input device further comprises a sulfuric acid raw material tank, a deionized water pipeline and a throttle valve, the sulfuric acid raw material tank is communicated with the sulfuric acid proportioning tank through the sulfuric acid circulating pump, the deionized water pipeline is also communicated with the sulfuric acid proportioning tank, and the deionized water pipeline is provided with the throttle valve.

[0026] The device for carbon fiber surface treatment has the following beneficial effects:

[0027] 1. The electrolytic tank is made of polypropylene or polyvinyl chloride material, the anode roller is made of positive graphite roller, and the guide roller is made of polytetrafluoroethylene material, so that the device cannot be corroded, the introduction of impurities caused by electrochemical corrosion in the surface treatment process is effectively avoided, the impurities cannot enter the tank body, the problem that impurities are introduced due to electrochemical corrosion in the surface treatment of the carbon fiber surface treatment device is solved, the problem that metal impurities are introduced by the surface treatment device used in the existing production, long-term operation causes the quality of the fiber to decrease and the carbon fiber production equipment to be chronically electrochemically corroded is solved, and the range of surface medium selection is greatly widened, such as the selection of strong acid.

[0028] 2. The conductivity meter is arranged at the filter screen to detect the conductivity of the electrolyte flowing into the electrolytic tank, the circulating pump is electrically connected with the conductivity meter to adjust the rotating speed of the circulating pump according to the conductivity, so as to control the concentration of the electrolyte in the electrolytic tank, and the flow of water supplement can be adjusted by the circulating pump to achieve the purpose of controlling the concentration of the surface treatment liquid.

[0029] 3. The pH meter and the pH liquid input device are arranged, the pH meter is arranged at the filter screen to detect the pH value of the electrolyte flowing into the electrolytic tank, the pH liquid input device is connected with the circulating tank to input the pH liquid into the circulating tank, and the pH liquid input device is electrically connected with the pH meter to adjust the liquid with different pH values input by the pH liquid input device according to the pH value, so as to accurately and effectively control the pH value in the electrolytic tank and meet the requirement of the carbon fiber tow surface treatment on the pH value, specifically, the alkaline pH solution can be provided in the electrolytic tank by the ammonium bicarbonate circulating pump, the ammonium bicarbonate storage tank and the ammonium bicarbonate proportioning tank, or the acidic pH solution can be provided in the electrolytic tank by the sulfuric acid circulating pump, the sulfuric acid storage tank and the sulfuric acid proportioning tank, so as to meet the requirement of the carbon fiber tow surface treatment on the pH value. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the device suitable for carbon fiber surface treatment.

[0031] Reference signs are indicated as:

[0032] 1, first electrolytic cell; 2, second electrolytic cell; 3, third electrolytic cell; 4, cathode plate; 5, carbon fiber tow; 6, filter screen; 7, pH meter; 8, conductivity meter; 9, anode roller; 10, guide roller; 11, current control system; 12, circulating pump; 13, circulating tank; 14, liquid level meter; 15, filter; 16, ammonium bicarbonate screw feeder; 17, deionized water pipeline; 18, throttle valve; 19, ammonium bicarbonate proportioning tank; 20, ammonium bicarbonate circulating pump; 21, ammonium bicarbonate storage tank; 22, sulfuric acid raw material tank; 23, sulfuric acid circulating pump; 24, sulfuric acid proportioning tank; 25, sulfuric acid storage tank. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0034] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0035] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. The intent is to be accurate in describing the principles and novel features of the application. Thus, although the application has been described with reference to specific embodiments thereof, it will be apparent to those of ordinary skill in the art that a number of changes can be made to the embodiments described without departing from the spirit and scope of the application. For example, the various features of the application can be combined in any combination, where possible. Accordingly, the scope of the application is to be construed as encompassing modifications and variations of the specific examples described herein, subject only to the conditions of the prior art.

[0036] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0037] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0038] In addition, it should be noted that the use of the words "first", "second" and the like to define parts of components is only for the convenience of distinguishing the corresponding parts of components, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0039] AsFigure 1 The utility model provides a device suitable for carbon fiber surface treatment, it includes:

[0040] Electrolytic cell, anode roller 9 and guide roller 10, at least one anode roller 9 and at least one guide roller 10 are arranged on one side of the electrolytic cell, at least one guide roller 10 and at least one anode roller 9 are also arranged on the other side of the electrolytic cell, after the drive and guide of carbon fiber tow 5 through anode roller 9 and guide roller 10, it enters the electrolytic cell through one side of the electrolytic cell, after the surface treatment in the electrolytic cell, it is guided out from the other side of the electrolytic cell and through guide roller 10 and anode roller 9, and the electrolytic cell is made of polypropylene or polyvinyl chloride material, the anode roller is made of positive graphite roller, and the guide roller is made of polytetrafluoroethylene material.

[0041] The utility model discloses a device suitable for carbon fiber surface treatment, it includes:

[0042] The utility model discloses a device suitable for carbon fiber surface treatment, it includes:

[0043] Therefore the utility model has solved the problem of low interlaminar shear strength of carbon fiber, effectively improved the interlaminar shear strength (ILSS) of carbon fiber, and facilitated the use of subsequent composite materials;The utility model is helpful to improve the quality of carbon fiber and realize long-period operation of the production line.

[0044] The utility model provides a device for carbon fiber surface treatment relates to a medium -large production line for carbon fiber surface treatment and long -term stable production industrialization device, including electrolytic cell, graphite roll, polytetrafluoroethylene roll (guide roll), graphite cathode plate, filter screen, filter, circulating tank, circulating pump, conductivity test end, pH test end, current control system, batching system etc. Among them, the batching system can satisfy the configuration demand of different electrolyte, the frequently used electrolyte of production line mainly includes ammonium electrolyte and acid electrolyte, ammonium electrolyte batching system includes screw feeder, throttle valve, proportioning tank, circulating pump, storage tank, liquid level meter etc.; Acid electrolyte batching system includes raw material tank, proportioning tank, circulating pump, throttle valve, storage tank, liquid level meter etc.

[0045] Preferably the electrolytic cell anode is a graphite roll, which can increase the degree of surface treatment by increasing the current.

[0046] Preferably, the electrolytic cell is generally made of polypropylene or polyvinyl chloride material. It is generally a two-level or three-level structure. Using polypropylene or polyvinyl chloride material can make it run stably for a long time, without damaging the production products or introducing impurities, and can facilitate the selection of more surface treatment media.

[0047] In some embodiments,

[0048] The electrolytic cell includes a first electrolytic cell 1, a second electrolytic cell 2 and a third electrolytic cell 3, the first electrolytic cell 1, the second electrolytic cell 2 and the third electrolytic cell 3 are arranged in sequence, the carbon fiber tows 5 are sequentially subjected to surface treatment in the first electrolytic cell 1, the second electrolytic cell 2 and the third electrolytic cell 3, one anode roller 9 and one guide roller 10 are arranged on the side of the first electrolytic cell 1 away from the second electrolytic cell 2, two guide rollers 10 and one anode roller 9 are arranged between the first electrolytic cell 1 and the second electrolytic cell 2, two guide rollers 10 and one anode roller 9 are arranged between the second electrolytic cell 2 and the third electrolytic cell 3, and one anode roller 9 and one guide roller 10 are arranged on the side of the third electrolytic cell 3 away from the second electrolytic cell 2, so that the carbon fiber tows 5 enter the first electrolytic cell 1 after passing through the anode roller 9 and the guide roller 10, the carbon fiber tows 5 from the first electrolytic cell 1 enter the second electrolytic cell 2 after being guided by the anode roller 9 and the guide roller 10, the carbon fiber tows 5 from the second electrolytic cell 2 enter the third electrolytic cell 3 after being guided by the anode roller 9 and the guide roller 10, and the carbon fiber tows 5 from the third electrolytic cell 3 are guided out by the anode roller 9 and the guide roller 10.

[0049] The specific structural form of the electrolytic cell and the specific structural form of the anode roller and the guide roller are arranged in sequence, so that the carbon fiber tows can enter the three electrolytic cells in sequence and respectively to complete the effect of surface treatment of the carbon fiber by the electrolyte, improve the performance of surface treatment, the anode roller and the guide roller arranged at the inlet end of the carbon fiber tows in the first electrolytic cell can provide the guiding and driving effect of the tows into the first electrolytic cell, the two guide rollers between the first and second electrolytic cells can respectively guide the tows out of the first electrolytic cell and guide the tows into the second electrolytic cell, the anode roller is located between the two guide rollers, so that the tows are guided out of the guide roller, pass through the anode roller and another guide roller and enter the second electrolytic cell, the two guide rollers between the second and third electrolytic cells can respectively guide the tows out of the second electrolytic cell and guide the tows into the third electrolytic cell, the anode roller is located between the two guide rollers, so that the tows are guided out of the guide roller, pass through the anode roller and another guide roller and enter the third electrolytic cell, the anode roller and the guide roller arranged at the outlet end of the carbon fiber tows in the third electrolytic cell can provide the guiding and driving effect of the tows out of the third electrolytic cell, and the surface treatment of the carbon fiber tows is completed and the tows are guided out.

[0050] In some embodiments,

[0051] The circulation tank 13, the circulation pump 12 and the filter screen 6 are further included, the inside of the circulation tank 13 can store liquid, the circulation pump 12 communicates with the circulation tank 13, the circulation pump 12 communicates with the electrolytic cell, the filter screen 6 is arranged on a pipeline communicating between the circulation pump 12 and the electrolytic cell, so that the circulation pump 12 can pump the liquid into the electrolytic cell after filtering through the filter screen 6, and the electrolytic cell has electrolyte.

[0052] The circulation tank, the circulation pump and the filter screen are arranged, the circulation tank is used for providing liquid (including electrolyte and / or water), the circulation pump is used for providing power to pump the liquid (including electrolyte and / or water) into the electrolytic cell, and the filter screen is used for effectively filtering the liquid entering the electrolytic cell.

[0053] The filter screen, the filter, the circulation tank and the circulation pump can provide a stable electrolyte circulation system, the filter screen and the filter can filter the loose filaments in the electrolyte, and the electrolyte is kept clean.

[0054] The current control system is generally a stable voltage direct current power supply, the voltage is not more than 36V, is reliable and effective, convenient to adjust, and safe to use.

[0055] Preferably, the current control system is arranged in a power distribution room, connected with a power supply line and a field, the positive pole of the power supply is connected with the graphite roller wire roller respectively, the negative pole of the power supply is connected with the graphite plate in the electrolytic cell, electrolyte solution is put in the electrolytic cell, the carbon fiber is immersed in the electrolyte solution, and the state of the surface of the carbon fiber is changed through the action of the current.

[0056] Preferably, the current control system comprises a current measuring element, a current control element and a current control execution element, and the current measuring element, the current control element and the current control execution element are electrically connected one by one.

[0057] The filter, the circulating pump and the circulating tank are connected in series on the same pipeline, the graphite cathode plate is arranged at the bottom of the circulating tank, the conductivity test end and the pH test end are located at the wire outlet end of the electrolytic cell, and the circulating tank, the graphite roller and the polytetrafluoroethylene roller are fixedly installed through a gear transmission structure.

[0058] In some embodiments,

[0059] The filter screen 6 is arranged on the side of the first electrolytic cell 1 away from the second electrolytic cell 2, and the filter screen 6 is arranged on the side of the third electrolytic cell 3 away from the second electrolytic cell 2, the circulating pump 12 pumps liquid into the third electrolytic cell 3 through the filter screen 6 on the side of the third electrolytic cell 3, the first electrolytic cell 1, the second electrolytic cell 2 and the third electrolytic cell 3 are sequentially connected, the electrolyte on the side of the first electrolytic cell 1 away from the second electrolytic cell 2 is filtered through the filter screen 6 on this side and then filtered through the filter 15 and then returned to the circulating tank 13, and a liquid level meter 14 is further arranged in the circulating tank 13.

[0060] This is a further preferred structure of the surface treatment device, filter screens are arranged at one end of the first electrolytic cell and one end of the third electrolytic cell, liquid flowing into the electrolytic cell and liquid flowing out of the electrolytic cell can be filtered, and the filter can further filter liquid flowing into the circulating tank, and the liquid level meter arranged in the circulating tank can effectively monitor the liquid level height in the circulating tank, so that precise control is realized.

[0061] In some embodiments,

[0062] The conductivity meter 8 is arranged at the filter screen 6 to detect the conductivity of electrolyte flowing into the electrolytic cell, the circulating pump 12 is electrically connected with the conductivity meter to adjust the rotating speed of the circulating pump 12 according to the size of the conductivity, so as to control the concentration of electrolyte in the electrolytic cell.

[0063] The utility model discloses still through conductivity appearance, conductivity appearance set at the filter screen to can detect the conductivity of electrolyte that flows into the electrolytic cell, the circulating pump with conductivity appearance electricity is connected to can adjust the rotating speed of circulating pump according to the size of conductivity, to control the concentration of electrolyte in the electrolytic cell, can reach the purpose of surface treatment liquid concentration control through the flow of circulating pump adjustment of water supply.

[0064] The conductivity test end and the pH test end of the utility model, the buffer tank can provide stable conductivity, pH monitoring and adjusting system, make electrolyte maintain certain process index control range.

[0065] The conductivity adjusting system of the utility model includes conductivity measuring element, solution supplementing control execution element, conductivity measuring element, solution supplementing control execution element between one one electric nature is connected.

[0066] In some embodiments,

[0067] Still include pH meter 7 and pH liquid input device, the pH meter 7 set at the filter screen 6 to can detect the pH value of electrolyte that flows into the electrolytic cell, the pH liquid input device with the circulating tank 13 is connected to can be into the pH liquid towards the circulating tank 13, the pH liquid input device with the pH meter 7 electricity is connected to can adjust the liquid of different pH value that the pH liquid input device inputs according to the size of pH value, to control the pH value in the electrolytic cell.

[0068] The utility model still through pH meter and pH liquid input device, the pH meter set at the filter screen to can detect the pH value of electrolyte that flows into the electrolytic cell, the PH liquid input device with the circulating tank is connected to can be into the pH liquid towards the circulating tank, the pH liquid input device with the pH meter electricity is connected to can adjust the liquid of different pH value that the pH liquid input device inputs according to the size of pH value, thereby accurately and effectively control the pH value in the electrolytic cell, satisfy the requirement of carbon fiber tow surface treatment to pH value.

[0069] The pH adjusting system of the utility model includes pH measuring element, solution supplementing control execution element, pH measuring element, solution supplementing control execution element between one one electric nature is connected.

[0070] In some embodiments,

[0071] The pH liquid input device includes ammonium bicarbonate circulating pump 20, ammonium bicarbonate storage tank 21 and ammonium bicarbonate proportioning tank 19, the ammonium bicarbonate proportioning tank 19 is communicated with the ammonium bicarbonate storage tank 21 through the ammonium bicarbonate circulating pump 20, the ammonium bicarbonate storage tank 21 is communicated with the circulating tank 13 through the ammonium bicarbonate circulating pump 20.

[0072] The pH input device of the utility model preferably includes ammonium bicarbonate circulating pump, ammonium bicarbonate storage tank and ammonium bicarbonate proportioning tank, can provide alkaline pH solution in electrolytic cell through ammonium bicarbonate circulating pump, ammonium bicarbonate storage tank and ammonium bicarbonate proportioning tank, meet the requirement of carbon fiber tow surface treatment to pH value.

[0073] In some embodiments,

[0074] The pH liquid input device further includes ammonium bicarbonate screw feeder 16, deionized water pipeline 17 and throttle valve 18, the ammonium bicarbonate screw feeder 16 is communicated with the ammonium bicarbonate proportioning tank 19, the deionized water pipeline 17 is also communicated with the ammonium bicarbonate proportioning tank 19, and the throttle valve 18 is arranged on the deionized water pipeline 17.

[0075] The pH liquid input device of the utility model further preferably includes ammonium bicarbonate screw feeder, deionized water pipeline and throttle valve, can carry out the deionization effect to ammonium bicarbonate solution, and effectively provide ammonium bicarbonate solution, meet the requirement of carbon fiber tow surface treatment to pH value.

[0076] In some embodiments,

[0077] The pH liquid input device includes sulfuric acid circulating pump 23, sulfuric acid storage tank 25 and sulfuric acid proportioning tank 24, the sulfuric acid proportioning tank 24 is communicated with the sulfuric acid storage tank 25 through the sulfuric acid circulating pump 23, and the sulfuric acid storage tank 25 is communicated with the circulating tank 13 through the sulfuric acid circulating pump 23.

[0078] The pH input device of the utility model preferably includes sulfuric acid circulating pump, sulfuric acid storage tank and sulfuric acid proportioning tank, can provide acidic pH solution in electrolytic cell through sulfuric acid circulating pump, sulfuric acid storage tank and sulfuric acid proportioning tank, meet the requirement of carbon fiber tow surface treatment to pH value.

[0079] In some embodiments,

[0080] The pH liquid input device further includes sulfuric acid raw material tank 22, deionized water pipeline 17 and throttle valve 18, the sulfuric acid raw material tank 22 is communicated with the sulfuric acid proportioning tank 24 through the sulfuric acid circulating pump 23, the deionized water pipeline 17 is also communicated with the sulfuric acid proportioning tank 24, and the throttle valve 18 is arranged on the deionized water pipeline 17.

[0081] The pH liquid input device of the utility model further preferably includes sulfuric acid raw material tank, deionized water pipeline and throttle valve, can carry out the deionization effect to sulfuric acid solution, and effectively provide sulfuric acid solution, meet the requirement of carbon fiber tow surface treatment to pH value.

[0082] As Figure 1 shown, the carbon fiber tows 5 are surface treated by three-stage electrolytic cells, the current control system 11 (stabilized DC power supply) is connected with the anode roll 9 (graphite roll) and the cathode plate 4, the (fluff) filter screen 6 and the filter 15 are used to filter the fluff in the electrolyte, so that the electrolyte is kept clean. The pH meter 7 and the conductivity meter 8 are located at the right part of the third electrolytic cell 3. The ammonium electrolyte batching system comprises an ammonium bicarbonate screw feeder 16, a throttle valve 18, an ammonium bicarbonate proportioning tank 19, an ammonium bicarbonate circulating pump 20, an ammonium bicarbonate storage tank 21 and a liquid level meter 14. The ammonium electrolyte is crushed by the ammonium bicarbonate screw feeder 16, enters the ammonium bicarbonate proportioning tank 19, the deionized water enters the ammonium bicarbonate proportioning tank 19 through the deionized water pipeline 17, the water amount is controlled by the throttle valve 18, the required concentration is configured to enter the ammonium bicarbonate storage tank 21, the ammonium bicarbonate circulating pump 20 enters the circulating tank 13, and the circulating pump 12 and the three electrolytic cells are circulated to ensure the stability of the electrolytic cell concentration. The acid electrolyte batching system comprises a sulfuric acid raw material tank 22, a sulfuric acid proportioning tank 24, a sulfuric acid circulating pump 23, a throttle valve 18, a sulfuric acid storage tank 25 and a liquid level meter 14.

[0083] The anode roll 9 (graphite roll) and the guide roll 10 (polytetrafluoroethylene roll) are preferably fixed by a gear transmission structure. The current control system 11 comprises a stabilized DC power supply, a current measuring element, a current control element and a current control execution element, and the current measuring element, the current control element and the current control execution element are electrically connected one by one. The conductivity adjustment system comprises a conductivity measuring element and a solution supplementing control execution element, and the conductivity measuring element and the solution supplementing control execution element are electrically connected one by one. The pH adjustment system comprises a pH measuring element and a solution supplementing control execution element, and the pH measuring element and the solution supplementing control execution element are electrically connected one by one.

[0084] The utility model provides a device for carbon fiber surface treatment, set up the voltage, current, conductivity, pH value required by production process device on the PLC control system to control carbon fiber surface treatment degree. Current test adjusting element will signal transmission to current test element and current adjustment executing element, through current test element and current adjustment executing element to reach the required current of process execution, reach the purpose of surface treatment process control. Conductivity element will signal transmission to conductivity measuring element, solution supplement control executing element, through conductivity measuring element, solution supplement control executing element to control the concentration of surface treatment, reach the purpose of surface treatment liquid concentration control (through the flow of water supplement). pH value test element will signal transmission to conductivity measuring element, solution supplement control executing element, through conductivity measuring element, solution supplement control executing element to control the concentration of surface treatment, reach the purpose of surface treatment liquid concentration control.

[0085] The utility model discloses the beneficial effect is: the utility model discloses through adopting electrolytic cell polypropylene or polyvinyl chloride material, positive pole graphite roll, guide roll polytetrafluoroethylene material avoids the problem that surface treatment electrochemistry corrosion introduces impurity, and greatly widens the range of surface medium selection simultaneously, such as the choice of strong acid allowance. Through, the automatic control of surface treatment concentration and pH value, be favorable to the more stable control of system. Its balanced process condition's stable realization and carbon fiber impurity introduction control, solved the problem of high -quality carbon silk especially aerospace aviation level carbon fiber quality promotion.

[0086] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement and improvement etc. that are made in the spirit and principles of the utility model should be included in the protection scope of the utility model. The above only is the preferred implementation mode of the utility model, and it should be pointed out that for ordinary skilled person in the prior art, on the premise of not departing from the technical principle of the utility model, can make a number of improvements and variations, and these improvements and variations should be regarded as the protection scope of the utility model.

Claims

1. An apparatus suitable for the surface treatment of carbon fibres characterised in that: The device comprises an electrolytic tank, an anode roller (9) and a guide roller (10), at least one anode roller (9) and at least one guide roller (10) are arranged on one side of the electrolytic tank, and at least one guide roller (10) and at least one anode roller (9) are arranged on the other side of the electrolytic tank, the carbon fiber tows (5) pass through the driving and guiding of the anode roller (9) and the guide roller (10), enter the electrolytic tank through one side of the electrolytic tank, are treated in the electrolytic tank, and are guided out from the other side of the electrolytic tank through the guide roller (10) and the anode roller (9), and the electrolytic tank is made of polypropylene or polyvinyl chloride, the anode roller is a positive graphite roller, and the guide roller is made of polytetrafluoroethylene.

2. The device suitable for carbon fiber surface treatment according to claim 1, wherein the electrolytic tank comprises a first electrolytic tank (1), a second electrolytic tank (2) and a third electrolytic tank (3), the first electrolytic tank (1), the second electrolytic tank (2) and the third electrolytic tank (3) are arranged in sequence, the carbon fiber tows (5) pass through the first electrolytic tank (1), the second electrolytic tank (2) and the third electrolytic tank (3) in sequence to be treated, one anode roller (9) and one guide roller (10) are arranged on the side of the first electrolytic tank (1) away from the second electrolytic tank (2), two guide rollers (10) and one anode roller (9) are arranged between the first electrolytic tank (1) and the second electrolytic tank (2), two guide rollers (10) and one anode roller (9) are arranged between the second electrolytic tank (2) and the third electrolytic tank (3), and one anode roller (9) and one guide roller (10) are arranged on the side of the third electrolytic tank (3) away from the second electrolytic tank (2), so that the carbon fiber tows (5) pass through the anode roller (9) and the guide roller (10) to enter the first electrolytic tank (1), the carbon fiber tows (5) coming out of the first electrolytic tank (1) pass through the guiding of the anode roller (9) and the guide roller (10) to enter the second electrolytic tank (2), the carbon fiber tows (5) coming out of the second electrolytic tank (2) pass through the guiding of the anode roller (9) and the guide roller (10) to enter the third electrolytic tank (3), and the carbon fiber tows (5) coming out of the third electrolytic tank (3) pass through the anode roller (9) and the guide roller (10) to be guided out.

3. The device suitable for carbon fiber surface treatment according to claim 2, wherein ​ ​ Further comprising a circulating tank (13) capable of storing liquid, a circulating pump (12) communicating with the circulating tank (13) and the electrolytic tank, and a filter screen (6) arranged on a pipeline communicating between the circulating pump (12) and the electrolytic tank, so that the circulating pump (12) can pump liquid into the electrolytic tank after filtering through the filter screen (6), and the electrolytic tank has electrolyte.

4. The device for carbon fiber surface treatment according to claim 3, characterized in that: The filter screen (6) is arranged on the side of the first electrolytic tank (1) away from the second electrolytic tank (2), and on the side of the third electrolytic tank (3) away from the second electrolytic tank (2), and the circulating pump (12) pumps liquid into the third electrolytic tank (3) through the filter screen (6) on one side of the third electrolytic tank (3), and the first electrolytic tank (1), the second electrolytic tank (2) and the third electrolytic tank (3) are communicated in sequence, and the electrolyte on the side of the first electrolytic tank (1) away from the second electrolytic tank (2) is filtered through the filter screen (6) on this side and then through a filter (15) before returning to the circulating tank (13), and a liquid level meter (14) is further arranged in the circulating tank (13).

5. The device for carbon fiber surface treatment according to claim 3, characterized in that: Further comprising a conductivity meter (8) arranged at the filter screen (6) to detect the conductivity of electrolyte flowing into the electrolytic tank, and the circulating pump (12) is electrically connected with the conductivity meter to adjust the rotating speed of the circulating pump (12) according to the conductivity, so as to control the concentration of electrolyte in the electrolytic tank.

6. The device for carbon fiber surface treatment according to claim 3, characterized in that: Further comprising a pH meter (7) arranged at the filter screen (6) to detect the pH value of electrolyte flowing into the electrolytic tank, and a pH liquid input device connected with the circulating tank (13) to input pH liquid into the circulating tank (13), and the pH liquid input device is electrically connected with the pH meter (7) to adjust the pH value of liquid input by the pH liquid input device according to the pH value, so as to control the pH value in the electrolytic tank.

7. The device for carbon fiber surface treatment according to claim 6, characterized in that: The pH liquid input device comprises an ammonium bicarbonate circulating pump (20), an ammonium bicarbonate storage tank (21) and an ammonium bicarbonate proportioning tank (19), the ammonium bicarbonate proportioning tank (19) communicates with the ammonium bicarbonate storage tank (21) through the ammonium bicarbonate circulating pump (20), and the ammonium bicarbonate storage tank (21) communicates with the circulating tank (13) through the ammonium bicarbonate circulating pump (20).

8. The device for carbon fiber surface treatment according to claim 7, characterized in that: The pH liquid input device further comprises an ammonium bicarbonate screw feeder (16) in communication with the ammonium bicarbonate proportioning tank (19), a deionized water pipeline (17) also in communication with the ammonium bicarbonate proportioning tank (19), and a throttle valve (18) provided on the deionized water pipeline (17).

9. The device for carbon fiber surface treatment according to claim 6, characterized in that: The pH liquid input device comprises a sulfuric acid circulating pump (23), a sulfuric acid storage tank (25), and a sulfuric acid proportioning tank (24), wherein the sulfuric acid proportioning tank (24) is in communication with the sulfuric acid storage tank (25) through the sulfuric acid circulating pump (23), and the sulfuric acid storage tank (25) is in communication with the circulating tank (13) through the sulfuric acid circulating pump (23).

10. The device for carbon fiber surface treatment according to claim 9, characterized in that: The pH liquid input device further comprises a sulfuric acid raw material tank (22), a deionized water pipeline (17), and a throttle valve (18), wherein the sulfuric acid raw material tank (22) is in communication with the sulfuric acid proportioning tank (24) through the sulfuric acid circulating pump (23), the deionized water pipeline (17) is also in communication with the sulfuric acid proportioning tank (24), and the throttle valve (18) is provided on the deionized water pipeline (17).

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