Non-contact carbon fiber anodic oxidation surface treatment system and method

Abstract

The invention belongs to the technical field of carbon fiber manufacturing, and particularly relates to a non-contact carbon fiber anodic oxidation surface treatment system and method.The non-contact carbon fiber anodic oxidation surface treatment system comprises an electrolysis unit, the electrolysis unit comprises an electrolysis bath, the two sides of the upper end of the electrolysis bath are each provided with an anode bath, and an electrolyte solution is arranged in each anode bath; the two anode tanks are both sleeved with liquid receiving tanks, the two anode tanks are connected and conducted with the positive electrode of a direct-current power source, two first guide rollers are arranged on the upper portion in the electrolytic tank, a porous partition plate is arranged at the lower ends of the two first guide rollers, and a cathode plate is arranged at the lower end of the porous partition plate. According to the carbon fiber filament surface treatment device, the anode tanks are arranged, and a non-contact anode conduction mode is adopted, so that the problems that broken filaments are generated on the surfaces of carbon fiber filaments and oxidation is not uniform are effectively avoided, and the stability of carbon fiber filament surface treatment is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of carbon fiber manufacturing, and particularly relates to a non-contact type carbon fiber anodic oxidation surface treatment system and method. BACKGROUND

[0002] Carbon fiber is an inorganic fiber material with a carbon content of more than 90%, and has excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, etc., and is widely used in the fields of aerospace, rail transportation, low-altitude economy, sports equipment, etc. The highly graphitized structure of carbon fiber results in extremely low surface energy and poor reactivity, making it difficult to form effective chemical bonding and mechanical interlocking with the resin matrix. Anodic oxidation introduces oxygen-containing polar groups on the fiber surface through active oxygen generated by electrolysis, improving the adhesion of the fiber and the matrix, and has the characteristics of high treatment efficiency and strong process controllability. However, the contact type anodic oxidation treatment process is commonly used in industry, which has the problem of uneven oxidation of carbon fiber tows, which can easily cause excessive oxidation on the surface of the carbon fiber tows and insufficient oxidation inside the tows. On the other hand, when carbon fiber is in contact with the conductive anode roller, the contact resistance is often unstable due to poor contact, and the change in contact resistance will cause large changes in voltage and current under the condition of low voltage (below 15kV), thereby affecting the stability of the surface treatment effect. When the contact is poor, it will also cause sparking and produce hair, thereby affecting the quality and uniformity of the carbon fiber. SUMMARY

[0003] The present application provides a non-contact type carbon fiber anodic oxidation surface treatment system and method to solve the problem of uneven oxidation and instability of carbon fiber surface treatment in the prior art.

[0004] To achieve the above purpose, the present application adopts the following technical solutions: A non-contact type carbon fiber anodic oxidation surface treatment system, comprising an electrolysis unit and a post-treatment unit. The electrolytic unit comprises an electrolytic cell, anode slots are arranged on both sides of the upper end of the electrolytic cell, an introduction roller is arranged between the electrolytic cell and the left anode slot, an exit roller is arranged between the electrolytic cell and the right anode slot, the introduction roller and the exit roller are rotationally connected through external draft machines and are located on the same horizontal line, the two anode slots are supported by a support, electrolyte solution is arranged in the anode slots, liquid receiving grooves are arranged outside the two anode slots, the two anode slots are connected in conduction with the positive electrode of a direct current power supply, wire inlets and wire outlets are respectively arranged on the left side wall and the right side wall of the anode slot, carbon fiber wires are immersed in the electrolyte solution, two first guide rollers are arranged at the upper part in the electrolytic cell, the first guide rollers are immersed in the electrolyte solution, the two first guide rollers are rotationally connected to the two ends of the inner side wall of the electrolytic cell and are located on the same horizontal line, a porous partition plate is arranged at the lower end of the two first guide rollers, the two ends of the porous partition plate are detachably mounted on the inner side wall of the electrolytic cell, a cathode plate is arranged at the lower end of the porous partition plate, the cathode plate is mounted on the bottom surface of the electrolytic cell through a support, the cathode plate is connected in conduction with the negative electrode of the direct current power supply, and a post-processing unit is arranged at the output side of the right anode slot.

[0005] Further, the post-processing unit comprises a water washing device, a drying device is arranged at the output side of the water washing device, and a wire collecting device is arranged at the output side of the drying device.

[0006] Still further, the bottom parts of the two liquid receiving grooves are connected with the inlet of a circulating pump through a pipeline, the outlet of the circulating pump is connected with the liquid inlet of the anode slot through a pipeline, and the circulating pump is connected with an external liquid preparation groove.

[0007] Still further, the material of the anode slot is an electrically conductive material, the width of the anode slot ranges from 30 mm to 150 mm, and the distance between the two anode slots ranges from 800 mm to 1600 mm.

[0008] Still further, the material of the cathode plate is a stainless steel plate, a nickel plate, a platinum plate or a graphite plate, and the distance between the cathode plate and the carbon fiber wires ranges from 5 mm to 10 mm.

[0009] Still further, second guide rollers are arranged between the water washing device and the drying device and between the drying device and the wire collecting device, and the second guide rollers are rotationally connected to the draft machines.

[0010] A non-contact surface treatment method for carbon fiber anode oxidation, comprising the following steps: Step one: carbon fiber anodic oxidation surface treatment, the carbon fiber yarn through the left side of the anode slot mouth and the yarn outlet, carbon fiber yarn first immersed in the electrolyte solution of anode tank, through the introduction of roller, the first guide roller and lead out the effect of the roller, the carbon fiber yarn immersed in the electrolyte solution in the electrolytic tank, by adjusting the output current of the DC power supply to make the electrolytic tank current density settings for 0.1-1.5A / m 2 , the carbon fiber yarn in the electrolytic tank for 0.3-10 min, then the carbon fiber yarn lead to another anode slot through the yarn inlet and outlet, finally get the surface treatment of carbon fiber yarn; Step two: washing carbon fiber yarn, the surface treated carbon fiber yarn through the washing device, the deionized water in the washing device for cleaning carbon fiber yarn, the pH of the deionized water is set to 6.9-7.1, the cleaning time is set to 3-20 min, the cleaning temperature is set to 30-90℃; Step three: drying carbon fiber yarn, the cleaned carbon fiber yarn through the second guide roller into the drying device, the temperature of the drying device is set to 50-120℃, the drying time of the drying device is set to 2-20 min; Step four: carbon fiber yarn winding, the drying carbon fiber yarn is collected by the winding machine through the second guide roller.

[0011] Further, the range of each bundle of carbon fiber yarn is 1k-24k, and the carbon fiber yarn is set to high strength, high model, polyacrylonitrile based carbon fiber or pitch based carbon fiber.

[0012] Further, the electrolyte in the electrolyte solution is set to sulfuric acid, nitric acid, sodium hydroxide, potassium hydroxide, ammonium carbonate, sodium carbonate, ammonium bicarbonate, sodium bicarbonate, sodium sulfate, ammonium bisulfate, ammonium phosphate or ammonium dihydrogen phosphate, and the concentration of the electrolyte solution is set to 5-10%.

[0013] Compared with the prior art, the present application has the following advantages: 1. The present application sets up anode tank, and adopts non-contact anode conduction mode, which effectively avoids the generation of hair on the surface of carbon fiber yarn, thereby ensuring the stability of the surface treatment of carbon fiber yarn. On the other hand, uneven contact between carbon fiber yarn and guide roller will cause uneven oxidation of fiber, therefore, the non-contact anode conduction mode effectively avoids the problem of uneven oxidation of carbon fiber yarn, and improves the interfacial adhesion performance of carbon fiber yarn and matrix resin.

[0014] 2. The present application adopts circulating pump to connect liquid tank, which drives the electrolyte solution in the anode tank to circulate, thereby avoiding unnecessary errors caused by different concentrations of electrolyte solution in the two anode tanks, and ensuring the stable operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the electrolysis device of the present invention; Figure 3 For the present invention Figure 2 A magnified view of a portion of circle A; Figure 4 This is a schematic diagram of a traditional contact-type anodic oxidation electrolysis device; In the diagram, there are: electrolysis unit 1, post-processing unit 2, electrolytic cell 3, anode tank 4, inlet roller 5, outlet roller 6, liquid receiving tank 7, DC power supply 8, wire inlet 9, wire outlet 10, guide roller 11, perforated partition 12, cathode plate 13, washing device 14, drying device 15, wire take-up device 16, circulating pump 17, and guide roller 18. Detailed Implementation

[0016] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0017] Comparison Cases like Figure 4 The conventional contact anodizing apparatus shown is used for surface treatment of polyacrylonitrile-based high-strength carbon fiber T700. The anode inlet roller and anode outlet roller are connected to a DC power supply. The polyacrylonitrile-based high-strength carbon fiber T700 enters the electrolytic cell after passing through the conductive anode inlet roller, is immersed in the electrolyte, and is then drawn by two guide rollers (number one) before passing through the anode outlet roller to obtain the surface-treated carbon fiber. During the experiment, the current density through the cathode is 0.5 A / m. 2 The residence time of polyacrylonitrile-based high-strength carbon fiber T700 in the electrolytic cell was 5 minutes; a 5% ammonium bicarbonate electrolyte solution was used. After surface treatment, the carbon fiber bundles were washed with deionized water at a temperature of 30°C for 3 minutes, and the pH of the washing water was measured to be 6.9. They were then dried in a drying device for 5 minutes at 50°C, and finally wound up using a winding machine to obtain the surface-treated carbon fiber. The interfacial shear strength between the obtained carbon fiber and epoxy resin was measured using a composite material interfacial mechanical property evaluation device, and the result was 47 MPa.

[0018] The interfacial shear strength of polyacrylonitrile-based high-strength carbon fiber T700 and epoxy resin was tested using a composite material interfacial mechanical property evaluation device. The test parameters were: fiber running speed of 0.12 mm / min, and no less than 40 valid data points for each sample. Example 1

[0019] like Figure 1 ,Figure 2 and Figure 3The non-contact carbon fiber anode surface oxidation treatment system shown, including electrolytic unit 1 and post-processing unit 2;The electrolytic unit 1 includes electrolytic tank 3, the upper end of electrolytic tank 3 both sides are provided with anode groove 4, the material of anode groove 4 is set to conductive material, the width range of anode groove 4 is set to 30-150mm, the distance between the two anode groove 4 is set to 800-1600mm, electrolytic tank 3 and left anode groove 4 between the setting has lead-in roller 5, electrolytic tank 3 and right anode groove 4 between the setting has lead-out roller 6, lead-in roller 5 and lead-out roller 6 are all through external draft machine rotation connection, and located on the same horizontal line, two anode groove 4 is supported by support, anode groove 4 is provided with electrolyte solution, two anode groove 4 outside are all set with liquid receiving groove 7, two liquid receiving groove 7 bottom are connected with circulating pump 17 inlet through pipeline, the outlet of circulating pump 17 is connected with the liquid inlet of anode groove 4 through pipeline, circulating pump 17 is connected with external liquid preparation tank, two anode groove 4 is connected with direct current power supply 8 positive pole respectively, after electrification, carbon fiber surface occurs anodic oxidation reaction, generates hydroxyl, carboxyl, carbonyl and other oxygen-containing groups on the surface of carbon fiber, the left side wall and right side wall of anode groove 4 are respectively provided with silk inlet 9 and silk outlet 10, carbon fiber is immersed in electrolyte solution, two first guide rollers 11 are arranged in the upper part of electrolytic tank 3, the first guide roller 11 is immersed in electrolyte solution, two first guide rollers 11 are respectively rotationally connected to the both ends of the inner side wall of electrolytic tank 3, and are arranged on the same horizontal line, the lower end of two first guide rollers 11 is provided with a porous partition plate 12, the both ends of the porous partition plate 12 are detachably mounted on the inner side wall of electrolytic tank 3, the lower end of the porous partition plate 12 is provided with a cathode plate 13, the cathode plate 13 is mounted on the bottom surface of electrolytic tank 3 through a support, the cathode plate 13 is connected with the negative pole of direct current power supply 8 and is conducted, after electrification, the cathode plate generates hydrogen by reduction reaction, the output side of the right anode groove 4 is provided with post-processing unit 2, the post-processing unit 2 includes water washing device 14, the output side of water washing device 14 is provided with drying device 15, the output side of drying device 15 is provided with silk collecting device 16, the material of cathode plate 13 is set to stainless steel plate, nickel plate, platinum plate or graphite plate, the distance between cathode plate 13 and carbon fiber is set to 5-10mm, the second guide roller 18 is arranged between water washing device 14 and drying device 15 and between drying device 15 and silk collecting device 16, the second guide roller 18 is rotationally connected to the draft machine. The optimal concentration of electrolyte solution varies according to the type of electrolyte. For strong acid and strong base electrolyte, the corresponding electrolyte solution concentration is relatively low. For salt electrolyte, the corresponding electrolyte solution concentration can be relatively improved. The treatment time varies according to the type of electrolyte. For strong acid and strong base electrolyte, the corresponding treatment time is relatively short. For salt electrolyte, the corresponding treatment time can be relatively prolonged.

[0020] A non-contact carbon fiber anodic oxidation surface treatment method, comprising the following steps: The specification of each bundle of carbon fiber filaments is 1K polyacrylonitrile-based high-strength carbon fiber T700, and the electrolyte solution is 5% ammonium bicarbonate electrolyte solution. Step one: anodic oxidation surface treatment of carbon fiber, the polyacrylonitrile-based high-strength carbon fiber T700 is passed through the filament inlet 9 and the filament outlet 10 of the left anode tank 4, the carbon fiber filaments are first immersed in the electrolyte solution in the anode tank 4, the carbon fiber filaments are immersed in the electrolyte solution in the electrolysis tank 3 through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the current density in the electrolysis tank 3 is set to 0.5 A / m 2 by adjusting the output current of the direct current power supply 8, the carbon fiber filaments stay in the electrolysis tank 3 for 5 min, the carbon fiber filaments pass through the filament inlet 9 and the filament outlet 10 of the right anode tank 4, and finally the carbon fiber filaments after surface treatment are obtained; Step two: water washing of carbon fiber filaments, the carbon fiber filaments after surface treatment are passed through the water washing device 14, the deionized water in the water washing device 14 washes the carbon fiber filaments, the pH of the deionized water is set to 6.9, the washing time is set to 3 min, and the washing temperature is set to 30°C; Step three: drying of carbon fiber filaments, the carbon fiber filaments after washing are passed through the second guide roller 18 into the drying device 15, the temperature of the drying device 15 is set to 50°C, and the drying time of the drying device 15 is set to 5 min; Step four: winding of carbon fiber filaments, the drying device 15 is set to 50°C, and the drying time of the drying device 15 is set to 5 min; Example 2

[0021] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of carbon fiber filaments is 1K polyacrylonitrile-based high-strength carbon fiber T700, and the electrolyte solution is 5% ammonium bicarbonate electrolyte solution. Step one: anodic oxidation surface treatment of carbon fiber, the polyacrylonitrile-based high-strength carbon fiber T700 is passed through the filament inlet 9 and the filament outlet 10 of the left anode tank 4, the carbon fiber filaments are first immersed in the electrolyte solution in the anode tank 4, the carbon fiber filaments are immersed in the electrolyte solution in the electrolysis tank 3 through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the current density in the electrolysis tank 3 is set to 0.5 A / m2 The carbon fiber yarn stays in the electrolytic cell 3 for 0.3 min, the carbon fiber yarn leads the right anode tank 4 to pass through the yarn inlet 9 and the yarn outlet 10, and finally obtains the surface treated carbon fiber yarn; Step two: washing the carbon fiber yarn, the surface treated carbon fiber yarn passes through the washing device 14, the deionized water in the washing device 14 washes the carbon fiber yarn, the pH of the deionized water is set to 7.0, the washing time is set to 3 min, and the washing temperature is set to 30℃; Step three: drying the carbon fiber yarn, the washed carbon fiber yarn enters the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 50℃, and the drying time of the drying device 15 is set to 5 min; Step four: winding the carbon fiber yarn, the drying carbon fiber yarn is wound by the winding machine through the second guide roller 18, the interfacial shear strength of the carbon fiber and the epoxy resin obtained is determined by the composite interfacial mechanical property evaluation device, and the test result is 52 MPa. Example 3

[0022] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each yarn of the carbon fiber yarn is 12K polyacrylonitrile-based high-strength carbon fiber, and the electrolyte solution is 5% sodium bicarbonate electrolyte solution; Step one: anodic oxidation surface treatment of carbon fiber, the polyacrylonitrile-based high-strength carbon fiber passes through the yarn inlet 9 and the yarn outlet 10 of the left anode tank 4, the carbon fiber yarn is first immersed in the electrolyte solution in the anode tank 4, and through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the carbon fiber yarn is immersed in the electrolyte solution in the electrolytic cell 3, the output current of the direct current power supply 8 is adjusted to set the current density in the electrolytic cell 3 to 1.5 A / m 2 The carbon fiber yarn stays in the electrolytic cell 3 for 10 min, the carbon fiber yarn leads the right anode tank 4 to pass through the yarn inlet 9 and the yarn outlet 10, and finally obtains the surface treated carbon fiber yarn; Step two: washing the carbon fiber yarn, the surface treated carbon fiber yarn passes through the washing device 14, the deionized water in the washing device 14 washes the carbon fiber yarn, the pH of the deionized water is set to 7.1, the washing time is set to 3 min, and the washing temperature is set to 90℃; Step three: drying the carbon fiber yarn, the washed carbon fiber yarn enters the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 120℃, and the drying time of the drying device 15 is set to 2 min; Step four: carbon fiber yarn winding, the winding machine through the second guide roller 18 to dry carbon fiber yarn for silk processing, through the composite interface mechanics performance evaluation device to determine the carbon fiber and epoxy resin interface shear strength obtained from this, the test results for 58 MPa. Example 4

[0023] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of the carbon fiber yarn is 24K polyacrylonitrile-based high model carbon fiber, and the electrolyte solution is 10% ammonium carbonate electrolyte solution. Step one: carbon fiber anodic oxidation surface treatment, the polyacrylonitrile-based high model carbon fiber is threaded through the yarn inlet 9 and the yarn outlet 10 of the left anode tank 4, the carbon fiber yarn is first immersed in the electrolyte solution in the anode tank 4, and the carbon fiber yarn is immersed in the electrolyte solution in the electrolysis tank 3 through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6. The output current of the direct current power supply 8 is adjusted to set the current density in the electrolysis tank 3 to 1.5 A / m 2 , the residence time of the carbon fiber yarn in the electrolysis tank 3 is 10 min, the carbon fiber yarn is threaded through the yarn inlet 9 and the yarn outlet 10 of the right anode tank 4, and finally the surface treated carbon fiber yarn is obtained; Step two: water washing of carbon fiber yarn, the surface treated carbon fiber yarn is threaded through the water washing device 14, the deionized water in the water washing device 14 is used to clean the carbon fiber yarn, the pH of the deionized water is set to 7.0, the cleaning time is set to 10 min, and the cleaning temperature is set to 50°C; Step three: drying of carbon fiber yarn, the cleaned carbon fiber yarn is threaded through the second guide roller 18 into the drying device 15, the temperature of the drying device 15 is set to 60°C, and the drying time of the drying device 15 is set to 5 min; Step four: carbon fiber yarn winding, the winding machine through the second guide roller 18 to dry carbon fiber yarn for silk processing, through the composite interface mechanics performance evaluation device to determine the carbon fiber and epoxy resin interface shear strength obtained from this, the test results for 58 MPa. Example 5

[0024] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of the carbon fiber yarn is 24K polyacrylonitrile-based high model carbon fiber, and the electrolyte solution is 10% ammonium carbonate electrolyte solution. Step 1: Anodizing surface treatment of carbon fiber. The polyacrylonitrile-based high-modulus carbon fiber is passed through the inlet 9 and outlet 10 of the left anode tank 4. The carbon fiber filament is first immersed in the electrolyte solution of the anode tank 4. Through the action of the inlet roller 5, the first guide roller 11, and the outlet roller 6, the carbon fiber filament is immersed in the electrolyte solution within the electrolytic cell 3. The current density in the electrolytic cell 3 is set to 0.1 A / m by adjusting the output current of the DC power supply 8. 2 The carbon fiber filaments stay in the electrolytic cell 3 for 1 minute. The carbon fiber filaments lead the right anode groove 4 through the inlet 9 and the outlet 10, and finally the surface-treated carbon fiber filaments are obtained. Step 2: Washing carbon fiber filaments. The surface-treated carbon fiber filaments are passed through a washing device 14. The deionized water in the washing device 14 is used to wash the carbon fiber filaments. The pH of the deionized water is set to 7.0, the washing time is set to 10 minutes, and the washing temperature is set to 50°C. Step 3: Drying carbon fiber filaments. The cleaned carbon fiber filaments enter the drying device 15 through the second guide roller 18. The temperature of the drying device 15 is set to 60°C and the drying time of the drying device 15 is set to 5 minutes. Step 4: Carbon fiber filament winding. The winding machine winds the dried carbon fiber filaments through the second guide roller 18. The interfacial shear strength between the carbon fiber filaments and epoxy resin is measured by the composite material interface mechanical property evaluation device. The test result is 52 MPa. Example 6

[0025] A non-contact carbon fiber anodizing surface treatment system and method, comprising the following steps: Each bundle of the carbon fiber filaments is a 12K polyacrylonitrile-based high-modulus carbon fiber, and the electrolyte solution is a 5% sodium hydroxide electrolyte solution. Step 1: Anodizing surface treatment of carbon fiber. The polyacrylonitrile-based high-modulus carbon fiber is passed through the inlet 9 and outlet 10 of the left anode tank 4. The carbon fiber filament is first immersed in the electrolyte solution of the anode tank 4. Through the action of the inlet roller 5, the first guide roller 11, and the outlet roller 6, the carbon fiber filament is immersed in the electrolyte solution within the electrolytic cell 3. The current density in the electrolytic cell 3 is set to 0.1 A / m by adjusting the output current of the DC power supply 8. 2 The carbon fiber filaments stay in the electrolytic cell 3 for 1 minute. The carbon fiber filaments lead the right anode groove 4 through the inlet 9 and the outlet 10, and finally the surface-treated carbon fiber filaments are obtained. Step two: washing the carbon fiber yarns, the surface treated carbon fiber yarns pass through the water washing device 14, the deionized water in the water washing device 14 washes the carbon fiber yarns, the pH of the deionized water is set to 7.0, the washing time is set to 10 min, and the washing temperature is set to 50℃; Step three: drying the carbon fiber yarns, the washed carbon fiber yarns pass through the second guide roller 18 into the drying device 15, the temperature of the drying device 15 is set to 60℃, and the drying time of the drying device 15 is set to 5 min; Step four: winding the carbon fiber yarns, the winding machine winds the dried carbon fiber yarns through the second guide roller 18, and the interfacial shear strength of the carbon fiber and the epoxy resin obtained thereby is determined by the composite interfacial mechanical property evaluation device, and the test result is 50 MPa. Example 7

[0026] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each yarn of the carbon fiber yarns is 12K acrylonitrile-based high model carbon fiber, and the electrolyte solution is 5% sodium hydroxide electrolyte solution; Step one: anodic oxidation surface treatment of carbon fiber, the acrylonitrile-based high model carbon fiber passes through the yarn inlet 9 and the yarn outlet 10 of the left anode tank 4, the carbon fiber yarn is first immersed in the electrolyte solution in the anode tank 4, and the carbon fiber yarn is immersed in the electrolyte solution in the electrolysis tank 3 through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the current density in the electrolysis tank 3 is set to 0.1 A / m 2 by adjusting the output current of the direct current power supply 8, the residence time of the carbon fiber yarn in the electrolysis tank 3 is 1 min, the carbon fiber yarn leads to the right anode tank 4 through the yarn inlet 9 and the yarn outlet 10, and finally the surface treated carbon fiber yarn is obtained; Step two: washing the carbon fiber yarns, the surface treated carbon fiber yarns pass through the water washing device 14, the deionized water in the water washing device 14 washes the carbon fiber yarns, the pH of the deionized water is set to 7.0, the washing time is set to 10 min, and the washing temperature is set to 50℃; Step three: drying the carbon fiber yarns, the washed carbon fiber yarns pass through the second guide roller 18 into the drying device 15, the temperature of the drying device 15 is set to 60℃, and the drying time of the drying device 15 is set to 5 min; Step four: winding the carbon fiber yarns, the winding machine winds the dried carbon fiber yarns through the second guide roller 18, and the interfacial shear strength of the carbon fiber and the epoxy resin obtained thereby is determined by the composite interfacial mechanical property evaluation device, and the test result is 50 MPa. Example 8

[0027] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of carbon fiber filaments is 12K polyacrylonitrile-based high-strength carbon fiber, and the electrolyte solution is 5% sodium hydroxide electrolyte solution. Step one: anodic oxidation surface treatment of carbon fiber, the polyacrylonitrile-based high-strength carbon fiber is threaded through the filament inlet 9 and the filament outlet 10 of the left anode tank 4, the carbon fiber filaments are first immersed in the electrolyte solution in the anode tank 4, and through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the carbon fiber filaments are immersed in the electrolyte solution in the electrolysis tank 3, the output current of the direct current power supply 8 is adjusted to set the current density in the electrolysis tank 3 to 0.1 A / m 2 The carbon fiber filaments stay in the electrolysis tank 3 for 1 min, the carbon fiber filaments are led to the right anode tank 4 through the filament inlet 9 and the filament outlet 10, and finally the surface-treated carbon fiber filaments are obtained. Step two: water washing of carbon fiber filaments, the surface-treated carbon fiber filaments are threaded through the water washing device 14, the deionized water in the water washing device 14 is used to clean the carbon fiber filaments, the pH of the deionized water is set to 7.0, the cleaning time is set to 10 min, and the cleaning temperature is set to 50°C. Step three: drying of carbon fiber filaments, the cleaned carbon fiber filaments are led into the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 60°C, and the drying time of the drying device 15 is set to 5 min. Step four: winding of carbon fiber filaments, the dried carbon fiber filaments are subjected to filament winding treatment by the winding machine through the second guide roller 18, the interfacial shear strength of the carbon fiber and epoxy resin obtained is determined by a composite material interfacial mechanical property evaluation device, and the test result is 55 MPa. Example 9

[0028] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of carbon fiber filaments is 12K polyacrylonitrile-based high-strength carbon fiber, and the electrolyte solution is 5% sodium hydroxide electrolyte solution. Step one: anodic oxidation surface treatment of carbon fiber, the polyacrylonitrile-based high-strength carbon fiber is threaded through the filament inlet 9 and the filament outlet 10 of the left anode tank 4, the carbon fiber filaments are first immersed in the electrolyte solution in the anode tank 4, and through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the carbon fiber filaments are immersed in the electrolyte solution in the electrolysis tank 3, the output current of the direct current power supply 8 is adjusted to set the current density in the electrolysis tank 3 to 0.1 A / m 2, the carbon fiber yarn in the electrolytic cell 3 stay time is 1 min, the carbon fiber yarn causes the right side anode groove 4 to pass through the yarn inlet 9 and the yarn outlet 10, finally obtains the carbon fiber yarn after surface treatment; Step two: washing carbon fiber yarn, the surface treated carbon fiber yarn passes through the washing device 14, the deionized water in the washing device 14 washes the carbon fiber yarn, the pH of the deionized water is set to 7.0, the washing time is set to 10 min, and the washing temperature is set to 50 DEG C; Step three: drying carbon fiber yarn, the washed carbon fiber yarn enters the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 60 DEG C, and the drying time of the drying device 15 is set to 5 min; Step four: carbon fiber yarn winding, the drying carbon fiber yarn is wound by the winding machine through the second guide roller 18, the interfacial shear strength of the carbon fiber and epoxy resin obtained is determined by the composite interfacial mechanical property evaluation device, and the test result is 51 MPa. Example 10

[0029] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each yarn of the carbon fiber yarn is 12K pitch-based carbon fiber, and the electrolyte solution is 5% ammonium bisulfate electrolyte solution; Step one: carbon fiber anodic oxidation surface treatment, the pitch-based carbon fiber passes through the yarn inlet 9 and the yarn outlet 10 of the left side anode groove 4, the carbon fiber yarn is first immersed in the electrolyte solution in the anode groove 4, under the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6, the carbon fiber yarn is immersed in the electrolyte solution in the electrolytic cell 3, the current density in the electrolytic cell 3 is set to 0.1 A / m 2 , the carbon fiber yarn in the electrolytic cell 3 stay time is 1 min, the carbon fiber yarn causes the right side anode groove 4 to pass through the yarn inlet 9 and the yarn outlet 10, finally obtains the carbon fiber yarn after surface treatment; Step two: washing carbon fiber yarn, the surface treated carbon fiber yarn passes through the washing device 14, the deionized water in the washing device 14 washes the carbon fiber yarn, the pH of the deionized water is set to 7.0, the washing time is set to 10 min, and the washing temperature is set to 50 DEG C; Step three: drying carbon fiber yarn, the washed carbon fiber yarn enters the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 60 DEG C, and the drying time of the drying device 15 is set to 5 min; Step four: carbon fiber yarn winding, the winding machine through the second guide roller 18 of the dried carbon fiber yarn for silk processing, through the composite material interface mechanics performance evaluation device to determine the carbon fiber and epoxy resin interface shear strength obtained from this, the test results for 50MPa. Example 11

[0030] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of the carbon fiber yarn is 12K polyacrylonitrile-based high-strength carbon fiber, and the electrolyte solution is 5% ammonium phosphate electrolyte solution. Step one: carbon fiber anodic oxidation surface treatment, the polyacrylonitrile-based high-strength carbon fiber is threaded through the yarn inlet 9 and the yarn outlet 10 of the left anode tank 4, the carbon fiber yarn is first immersed in the electrolyte solution in the anode tank 4, and the carbon fiber yarn is immersed in the electrolyte solution in the electrolysis tank 3 through the action of the lead-in roller 5, the first guide roller 11 and the lead-out roller 6. The output current of the direct current power supply 8 is adjusted to set the current density in the electrolysis tank 3 to 0.1A / m 2 , the residence time of the carbon fiber yarn in the electrolysis tank 3 is 1min, the carbon fiber yarn is led to the right anode tank 4 through the yarn inlet 9 and the yarn outlet 10, and finally the surface-treated carbon fiber yarn is obtained; Step two: water washing of carbon fiber yarn, the surface-treated carbon fiber yarn is threaded through the water washing device 14, the deionized water in the water washing device 14 is used to clean the carbon fiber yarn, the pH of the deionized water is set to 7.0, the cleaning time is set to 10min, and the cleaning temperature is set to 50℃; Step three: drying of carbon fiber yarn, the cleaned carbon fiber yarn is introduced into the drying device 15 through the second guide roller 18, the temperature of the drying device 15 is set to 60℃, and the drying time of the drying device 15 is set to 5min; Step four: carbon fiber yarn winding, the winding machine through the second guide roller 18 of the dried carbon fiber yarn for silk processing, through the composite material interface mechanics performance evaluation device to determine the carbon fiber and epoxy resin interface shear strength obtained from this, the test results for 50MPa. Example 12

[0031] A non-contact carbon fiber anodic oxidation surface treatment system and method, comprising the following steps: The specification of each bundle of the carbon fiber yarn is 12K polyacrylonitrile-based high-strength carbon fiber, and the electrolyte solution is 5% ammonium phosphate electrolyte solution. Step one: carbon fiber anodic oxidation surface treatment, the polyacrylonitrile-based high-strength carbon fiber is passed through the left anode tank 4 inlet 9 and outlet 10, the carbon fiber is first immersed in the electrolyte solution in the anode tank 4, through the introduction of the roller 5, the first guide roller 11 and the lead-out roller 6, the carbon fiber is immersed in the electrolyte solution in the electrolytic tank 3, by adjusting the output current of the direct current source 8, the current density in the electrolytic tank 3 is set to 0.1A / m 2 , the carbon fiber stays in the electrolytic tank 3 for 1min, the carbon fiber is led to the right anode tank 4 through the inlet 9 and the outlet 10, and finally the surface treated carbon fiber is obtained; Step two: washing the carbon fiber, the surface treated carbon fiber is passed through the washing device 14, the deionized water in the washing device 14 is used to clean the carbon fiber, the pH of the deionized water is set to 7.0, the cleaning time is set to 10min, and the cleaning temperature is set to 50℃; Step three: drying the carbon fiber, the cleaned carbon fiber is passed through the second guide roller 18 into the drying device 15, the temperature of the drying device 15 is set to 60℃, and the drying time of the drying device 15 is set to 5min; Step four: carbon fiber winding, the drying carbon fiber is wound by the winding machine through the second guide roller 18, the interfacial shear strength of the carbon fiber and epoxy resin obtained is determined by the composite interfacial mechanical property evaluation device, and the test result is 48MPa.

[0032] Table 1. Comparison of interfacial shear strength results of comparative examples and embodiments

[0033] The main features and advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0034] In addition, it should be understood that although the present application is described in the form of embodiments, each embodiment does not contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A non-contact carbon fiber anodizing surface treatment system, characterized in that: It includes an electrolysis unit (1) and a post-processing unit (2); The electrolysis unit (1) includes an electrolytic cell (3). Anode tanks (4) are respectively provided on both sides of the upper end of the electrolytic cell (3). An inlet roller (5) is provided between the electrolytic cell (3) and the left anode tank (4). An outlet roller (6) is provided between the electrolytic cell (3) and the right anode tank (4). The inlet roller (5) and the outlet roller (6) are rotatably connected by an external drawing machine and are located on the same horizontal line. The two anode tanks (4) are supported by a bracket. An electrolyte solution is provided in the anode tanks (4). A liquid receiving tank (7) is provided on the outside of the two anode tanks (4). The two anode tanks (4) are respectively connected to the positive terminal of a DC power supply (8). An inlet (9) and an outlet (10) are respectively opened on the left and right walls of the anode tanks (4). Carbon fiber filaments are immersed in electrolyte solution. Two No. 1 guide rollers (11) are set in the upper part of the electrolytic cell (3). The No. 1 guide rollers (11) are immersed in electrolyte solution. The two No. 1 guide rollers (11) are rotatably connected to the two ends of the inner side wall of the electrolytic cell (3) and set on the same horizontal line. The lower end of the two No. 1 guide rollers (11) is provided with a porous partition plate (12). The two ends of the porous partition plate (12) are detachably installed on the inner side wall of the electrolytic cell (3). The lower end of the porous partition plate (12) is provided with a cathode plate (13). The cathode plate (13) is installed on the bottom surface of the electrolytic cell (3) through a bracket. The cathode plate (13) is connected to the negative terminal of the DC power supply (8). The output side of the right anode tank (4) is provided with a post-processing unit (2).

2. The non-contact carbon fiber anodizing surface treatment system according to claim 1, characterized in that: The post-processing unit (2) includes a washing device (14), a drying device (15) is provided on the output side of the washing device (14), and a yarn take-up device (16) is provided on the output side of the drying device (15).

3. The non-contact carbon fiber anodizing surface treatment system according to claim 1, characterized in that: The bottom of the two receiving tanks (7) is connected to the inlet of the circulating pump (17) through a pipe, the outlet of the circulating pump (17) is connected to the inlet of the anode tank (4) through a pipe, and the circulating pump (17) is connected to an external liquid distribution tank.

4. The non-contact carbon fiber anodizing surface treatment system according to claim 1, characterized in that: The anode groove (4) is made of conductive material, the width of the anode groove (4) is set to 30-150mm, and the distance between two anode grooves (4) is set to 800-1600mm.

5. The non-contact carbon fiber anodizing surface treatment system according to claim 1, characterized in that: The cathode plate (13) is made of stainless steel, nickel, platinum or graphite, and the distance between the cathode plate (13) and the carbon fiber filament is 5-10 mm.

6. The non-contact carbon fiber anodizing surface treatment system according to claim 1, characterized in that: A second guide roller (18) is provided between the washing device (14) and the drying device (15) and between the drying device (15) and the winding device (16). The second guide roller (18) is rotatably connected to the drawing machine.

7. A non-contact carbon fiber anodizing surface treatment method according to any one of claims 2-6, characterized in that, Includes the following steps: Step 1: Anodizing surface treatment of carbon fiber. The carbon fiber filament is passed through the inlet (9) and outlet (10) of the left anode tank (4). The carbon fiber filament is first immersed in the electrolyte solution of the anode tank (4). Through the action of the inlet roller (5), the first guide roller (11) and the outlet roller (6), the carbon fiber filament is immersed in the electrolyte solution in the electrolytic tank (3). The current density in the electrolytic tank (3) is set to 0.1-1.5 A / m by adjusting the output current of the DC power supply (8). 2 The carbon fiber filament stays in the electrolytic cell (3) for 0.3-10 minutes. Then the carbon fiber filament is led to the right anode cell (4) and passes through the inlet (9) and outlet (10) to finally obtain the surface-treated carbon fiber filament. Step 2: Wash carbon fiber filaments with water. The surface-treated carbon fiber filaments are passed through a water washing device (14). The deionized water in the water washing device (14) is used to wash the carbon fiber filaments. The pH of the deionized water is set to 6.9-7.1, the washing time is set to 3-20 min, and the washing temperature is set to 30-90℃. Step 3: Drying carbon fiber filaments. The cleaned carbon fiber filaments enter the drying device (15) through the second guide roller (18). The temperature of the drying device (15) is set to 50-120℃, and the drying time of the drying device (15) (4) is set to 2-20min. Step 4: Winding up the carbon fiber filaments. The winding machine winds up the dried carbon fiber filaments using the second guide roller (18).

8. The non-contact carbon fiber anodizing surface treatment method according to claim 6, characterized in that: The bundle of each carbon fiber filament has a bundle size ranging from 1k to 24k, and the carbon fiber filament is configured as high-strength, high-modulus, polyacrylonitrile-based carbon fiber, or pitch-based carbon fiber.

9. The non-contact carbon fiber anodizing surface treatment method according to claim 6, characterized in that: The electrolyte in the electrolyte solution is set as sulfuric acid, nitric acid, sodium hydroxide, potassium hydroxide, ammonium carbonate, sodium carbonate, ammonium bicarbonate, sodium bicarbonate, sodium sulfate, ammonium bisulfate, ammonium phosphate, or ammonium dihydrogen phosphate, and the concentration of the electrolyte solution is set as 5-10%.

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