Oiling device and method for controlling liquid rate of carbon fiber precursor

Abstract

The invention discloses an oiling device and method for controlling the liquid rate of a carbon fiber precursor. Concentrated oil and desalted water are injected into an oiling agent homogenizing kettle in proportion, diluted and then fed into an oiling agent dispersing barrel through a conveying pipeline, a rotating blade is nested outside the oiling agent dispersing barrel, and the concentrated oil and the desalted water are dispersed together through the oiling agent dispersing barrel and the rotating blade and enter an oiling tank. And the oiling agent dispersing barrel and the rotating blades can realize self-circulation of the oiling agent in the oiling groove. The stability and uniformity of an oil agent in the protofilament production process in a special temperature environment are guaranteed, meanwhile, the liquid carrying rate of oil-immersed tows can be controlled through the oil control air nozzle and the upper oil pressing roller, damage to the surfaces of the tows caused by extrusion of the tows through traditional upper and lower pressing rollers is reduced, the probability of extrusion accidents of workers is greatly reduced, and the production efficiency is improved. The preparation of the high-performance carbon fiber precursor is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber precursor production, and in particular relates to an oiling device and method for controlling the liquid rate of carbon fiber precursor. Background Art

[0002] The oiling process of carbon fiber precursor is an important part of the production of high-performance carbon fiber precursor. It effectively avoids defects on the fiber surface that affect the performance of the carbon fiber, can give the precursor better antistatic properties, and has better high temperature resistance in the subsequent pre-oxidation process. The traditional oiling device and method, due to the concentration difference and temperature difference of the oil in different parts of the upper oil tank, causes uneven oiling of the tow, deterioration of the oil, etc. The traditional method of controlling the liquid rate of the oil-impregnated tow by squeezing the upper and lower oil rollers, in addition to damaging the fiber surface, will also make the fibers stick together, which cannot meet the needs of industrial wet spinning to produce high-quality precursors. In view of this, in order to solve the problems of concentration difference and temperature difference of the oil in different parts of the upper oil tank, uneven oiling of the tow, deterioration of the oil, difficulty in stable control of the liquid rate of the oil-impregnated tow, and fiber adhesion caused by the oil roller, it is necessary to develop a new oiling device and oiling method for wet spinning of polyacrylonitrile carbon fiber precursor. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides an oiling device and method for controlling the liquid rate of carbon fiber raw yarn.

[0004] The technical solution for achieving the purpose of the present invention is as follows:

[0005] An oiling device for controlling the liquid rate of carbon fiber raw yarn includes an oiling module, a circulating temperature control module, an oil control module, and an oil homogenizing kettle;

[0006] The oiling module includes an oiling tank, an oil dispersion cylinder, a rotating blade, and a driving roller group. The oil dispersion cylinder and the oiling tank can realize self-circulation in the oil tank through a circulation pump 2;

[0007] The circulating temperature control module includes a circulating temperature control tank, a circulating temperature control pipeline, and a temperature monitor. The circulating temperature control pipeline is connected to the circulating temperature control tank, and the circulating temperature control pipeline is laid at the bottom of the upper oil tank.

[0008] The oil control module includes an oil control jet device, an upper oil pressure roller, and a reflux tank, and the reflux tank is connected to the oil homogenizing kettle through a pipeline;

[0009] The oil agent homogenizing kettle is connected with the oil agent dispersing cylinder, the upper oil tank and the reflux tank through pipelines. The oil agent homogenizing kettle is connected with the desalted water pipeline. A homogenizing stirring device is arranged in the oil agent homogenizing kettle.

[0010] As a preferred embodiment, the oil dispersion cylinder is fixedly arranged on the inner wall of the upper oil tank, the interior of the oil dispersion cylinder is a cavity structure, and the outer cylinder body has a plurality of oil outlets, which can be slits, round holes or meshes; the internal cavity is connected to the upper oil tank and the oil homogenizing kettle through the circulation pump 2. The oil enters the internal cavity of the dispersion cylinder from the upper oil tank through the circulation pump 2 and then flows out from the oil outlet, realizing self-circulation in the oil tank.

[0011] As a preferred method, the rotating blades and the oil dispersion cylinder are coaxially nested through bearings, and the rotating blades are rotated by a motor at a speed of 10 to 50 / min. The oil dispersion cylinder is connected to a circulation pump to continuously spray oil outward, and the oil is dispersed by the rotating blades to pass through the filament bundle, so that each raw silk is fully impregnated and the double yarn is reduced.

[0012] As a preferred embodiment, the driving roller group is arranged around the oil dispersion cylinder, the oil tank roller No. 1 and roller No. 6 are arranged at 10 to 20 cm from the opening of the upper oil tank, with an interval of 100 cm to 120 cm, and the two rollers are kept at the same height and parallel to each other; the No. 2 and roller No. 5 are arranged at 30 to 40 cm from the opening of the upper oil tank, with an interval of 80 cm to 100 cm, and the two rollers are kept at the same height and parallel to each other; the No. 3 and roller No. 4 are arranged at 50 to 60 cm from the opening of the upper oil tank, with an interval of 60 cm to 80 cm, and the two rollers are kept at the same height and parallel to each other; the polyacrylonitrile precursor yarn bundle is successively wound around the No. 1 roller, the No. 2 roller, the No. 3 roller, the No. 4 roller, the No. 5 roller and the No. 6 roller and then leaves the upper oil tank.

[0013] As a preferred method, the circulating temperature-controlled pipeline is laid in an "S" shape at the bottom of the upper oil tank. The distance between the pipeline and the bottom should be maintained at 10 to 20 cm, and the distance between the pipelines should be maintained at 10 to 20 cm. The temperature-controlled circulating pipeline is laid at the bottom of the upper oil tank to prevent the oil from deteriorating in an extreme temperature environment and affecting the oiling effect.

[0014] As a preferred mode, the temperature of the circulating temperature control tank is set to be 50°C higher than the real-time temperature when the temperature detector detects a real-time temperature less than 5°C; when the temperature detector detects a real-time temperature greater than 25°C, the temperature of the circulating tank is set to be 50°C lower than the real-time temperature. The liquid therein may be heat transfer oil, coolant, water, etc.

[0015] As a preferred method, the temperature detector is set at 30 cm from the opening of the upper oil tank to detect the temperature of the liquid in the upper oil tank. The normal temperature range is set to 5-25°C. When the temperature of the oil in the upper oil tank exceeds the set minimum threshold of 5°C and the maximum threshold of 25°C, the circulation pump starts to circulate.

[0016] As a preferred embodiment, the oil control jet device has a certain number of cavities inside, and the air outlet of the oil control jet device is in the shape of a rectangular slit, the air outlet direction is 60° to the tangent line at the intersection of the air outlet direction and the upper oil pressure roller, and the air outlet speed of the jet nozzle is 5 to 50 m / s.

[0017] As a preferred method, the number of oil control air nozzles and the number of internal chambers correspond to the number of tows during actual production.

[0018] As a preferred embodiment, the oil control jet device and the upper oil pressure roller are arranged 50 cm above the reflux groove.

[0019] As a preferred embodiment, the material of the upper oil pressure roller and the driving roller can be a single metal, stainless steel or polytetrafluoroethylene, the roller surface is polished, and the surface friction coefficient is 0.01 to 0.15.

[0020] As a preferred embodiment, an oiling method for an oiling device for controlling the liquid rate of carbon fiber raw yarn comprises the following steps:

[0021] Add concentrated oil agent and desalted water into the oil agent homogenizing kettle in proportion and stir homogenously. After the concentrated oil agent is diluted to a homogeneous emulsion with a concentration of 0.5-3.0%, it is sent to the oil agent dispersion cylinder through the conveying pipeline, and dispersed into the upper oil tank through the oil agent dispersion cylinder and the rotating blades. The oil agent dispersion cylinder and the rotating blades can realize the self-circulation of the oil agent in the upper oil tank to ensure the uniform concentration of the oil agent in the oil tank. When the temperature controller at the bottom of the upper oil tank recognizes that the temperature is out of the set range, the liquid in the temperature control circulation tank begins to enter the temperature control pipeline at the bottom of the upper oil tank through the circulation pump to realize the upper The temperature of the oil in the oil tank is kept within a suitable range; the polyacrylonitrile precursor tow is immersed below the liquid level of the upper oil tank and around the oil dispersion cylinder by the traction of six driving rollers, and multiple bundles of polyacrylonitrile carbon fiber precursor tows are immersed below the liquid level of the upper oil tank around the oil dispersion cylinder around the driving roller group. The oil dispersion cylinder is connected to the circulation pump 2 to continuously spray oil outward, and the oil is dispersed by the rotating blades to make the oil pass through the tow, so that each precursor is fully impregnated. The tow comes out of the oil liquid surface and passes through the lower pressure roller oil and the oil control jet device to remove the excess oil attached to the tow, and the oiling is completed. The excess oil flows into the reflux tank, and the oil in the reflux tank enters the oil homogenization kettle through the circulation pump 4 and is mixed with the concentrated oil and desalted water to form a new homogenized oil, and then continues to be injected into the upper oil tank.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention can maintain the concentration of the oil agent in the upper oil tank to always reach the concentration required by the process by diluting the oil agent and then adding it into the external circulation system of the upper oil tank and the internal circulation system of the oil agent dispersion cylinder in the upper oil tank, thereby ensuring that the concentration of the oil agent in the upper oil tank is evenly distributed.

[0024] 2. The present invention uses the combined effect of an oil dispersion cylinder and rotating blades. The raw silk is pulled into the liquid surface at the periphery of the oil dispersion cylinder by a driving roller. The dispersion cylinder continuously sprays oil outwards. The rotating blades disperse the oil so that it passes through the filament bundle, allowing each raw silk to be fully immersed in the oil, thereby reducing the problem of bundle doubling.

[0025] 3. The present invention uses a circulating temperature control device to ensure the normal progress of the raw silk oiling process in extremely cold or hot environments, maintain the temperature of the oil agent in the upper oil tank within the temperature range required by the process, and ensure that the oil agent in the upper oil tank does not deteriorate and the temperature distribution is uniform.

[0026] 4. The present invention can stably control the liquid carrying rate of the filament bundle after oil immersion through the joint action of the jet device and the upper oil pressure roller in the oil control device. Compared with the traditional mechanical extrusion control of the liquid carrying rate, the airflow control of the liquid carrying rate can further protect the fiber and reduce the problems of fiber being squeezed and adhered. The oil agent reflux saves the use of oil agent and reduces the cost.

[0027] 5. The oil control method of the oil control jet nozzle and the upper oil pressure roller in the present invention eliminates the risk points when the upper and lower pressure rollers of the traditional equipment squeeze at the same time, reduces the entanglement of the wire bundle caused by the oil pressure roller squeezing the wire bundle, and also reduces the occurrence of squeezing accidents when workers clean the oil pressure roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a schematic diagram of the overall structure of an oiling device for controlling the liquid rate of carbon fiber raw yarn.

[0029] Figure 2 It is a schematic diagram of the structure of the oil control jet device.

[0030] Figure 3 This is a diagram showing the effect of using the oil control jet device.

[0031] Figure 4 It is a schematic diagram of the structure of the oil control agent dispersion cylinder nested with rotating blades.

[0032] Figure 5 It is a comparison diagram of different embodiments of the present invention.

[0033] Explanation of the symbols in the accompanying drawings: 1-upper oil tank, 2-reflux tank, 3-drive roller group, 3-filament bundle one, 4-circulation temperature control pipeline, 5-circulation temperature control tank, 6-filament bundle two, 7-oil dispersion cylinder, 8-oil spray outlet, 9-rotating blades, 10-circulation pump one, 11-circulation pump two, 12-circulation pump three, 13-circulation pump four, 14-oil homogenizing kettle, 15-desalted water pipeline, 16-upper oil pressure roller, 17-gas pressure pipeline, 18-gas pipeline valve, 19-oil control jet device, 20-temperature monitor, 21-inner chamber of the jet head, 22-jet nozzle (air outlet), 23-bearing. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to this aspect, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0035] The present invention discloses an oiling device for controlling the liquid rate of carbon fiber raw yarn, comprising an oiling module, a circulating temperature control module, an oil control module and an oil homogenizing kettle;

[0036] The oiling module includes an oiling tank 1, an oil dispersion cylinder 7, a rotating blade 9, and a driving roller group 3. The oil dispersion cylinder 7 and the oiling tank 1 are self-circulated in the oil tank through a circulation pump 11;

[0037] The circulating temperature control module includes a circulating temperature control tank 5, a circulating temperature control pipe 4, and a temperature monitor 20. The circulating temperature control pipe 4 is connected to the circulating temperature control tank 5, and the circulating temperature control pipe 4 is laid at the bottom of the upper oil tank 1;

[0038] The oil control module includes an oil control jet device 19, an upper oil pressure roller 16, and a reflux tank 2, and the reflux tank 2 is connected to the oil homogenizing kettle 14 through a pipeline;

[0039] The oil agent homogenizing kettle 14 is connected to the oil agent dispersing cylinder 7, the upper oil tank 1 and the reflux tank 2 through pipelines. The oil agent homogenizing kettle 14 is connected to the desalted water pipeline 15. The oil agent homogenizing kettle 14 is provided with a homogenizing stirring device.

[0040] The oil dispersion cylinder 7 is fixedly arranged on the inner wall of the upper oil tank 1; the interior of the oil dispersion cylinder 7 is a cavity structure, and the outer cylinder body has a plurality of oil spray outlets 8, and the oil outlets can be slits, round holes or meshes; the internal cavity is connected to the upper oil tank 1 and the oil homogenizing kettle 14 through a circulation pump three 12; the oil enters the internal cavity of the oil dispersion cylinder 7 from the upper oil tank 1 through a circulation pump two 11 and then gushes out from the oil spray outlet 8, realizing self-circulation in the oil tank.

[0041] The rotating blade 9 and the oil dispersion cylinder 7 are coaxially nested through the bearing 23. The rotating blade 9 is driven by the motor to rotate at a speed of 10 to 50 / min. The oil dispersion cylinder 7 is connected to the circulation pump 11 to continuously spray the oil outward, and the oil is dispersed by the rotating blade 9 so that each raw silk is fully impregnated.

[0042] The driving roller group 3 is arranged around the oil dispersing cylinder 7. The No. 1 roller and the No. 6 roller of the oil tank are arranged at 10 to 20 cm away from the opening of the upper oil tank 1, with an interval of 100 cm to 120 cm, and the two rollers are kept at the same height and parallel to each other; the No. 2 roller and the No. 5 roller are arranged at 30 to 40 cm away from the opening of the upper oil tank 1, with an interval of 80 cm to 100 cm, and the two rollers are kept at the same height and parallel to each other; the No. 3 roller and the No. 4 roller are arranged at 50 to 60 cm away from the opening of the upper oil tank 1, with an interval of 60 cm to 80 cm, and the two rollers are kept at the same height and parallel to each other; the polyacrylonitrile precursor filament bundle is successively wound around the No. 1 roller, the No. 2 roller, the No. 3 roller, the No. 4 roller, the No. 5 roller and the No. 6 roller and then leaves the upper oil tank 1.

[0043] The circulating temperature control pipeline 4 is laid in an "S" shape at the bottom of the upper oil tank 1. The distance between the circulating temperature control pipeline 4 and the bottom of the upper oil tank 1 should be maintained at 10 to 20 cm, and the distance between the pipelines should be maintained at 10 to 20 cm.

[0044] The temperature of the circulating temperature-controlled bath 5 is set when it is working. When the temperature detector 20 detects that the real-time temperature is less than 5°C, the temperature of the circulating temperature-controlled bath 5 is set to 50°C higher than the real-time temperature; when the temperature detector 20 detects that the real-time temperature is greater than 25°C, the temperature of the circulating temperature-controlled bath 5 is set to 50°C lower than the real-time temperature; the liquid therein may be heat transfer oil, coolant, water, etc.

[0045] The temperature detector 20 is arranged at 30 cm from the opening of the upper oil tank 1 to detect the temperature of the liquid in the upper oil tank 1. The normal temperature range is set to 5-25°C. When the temperature of the oil in the upper oil tank 1 exceeds the set minimum threshold of 5°C and the maximum threshold of 25°C, the circulation pump 10 starts to circulate.

[0046] The oil control jet device 19 has a certain number of jet head internal chambers 21 inside. The air outlet of the oil control jet device 19 is in the shape of a rectangular slit. The air outlet direction is 60° to the tangent line at the intersection of the air outlet direction and the upper oil pressure roller 16. The air outlet speed of the jet nozzle 22 is 5 to 50 m / s.

[0047] The oil control jet device 19 is connected to the gas pressure pipeline 17 , and a gas pipeline valve 18 is also provided between the oil control jet device 19 and the gas pressure pipeline 17 .

[0048] The number of the oil control air nozzles 22 and the number of the internal chambers 21 both correspond to the number of tows during actual production.

[0049] The oil control jet device 19 and the upper oil pressure roller are arranged 50 cm above the reflux groove 2.

[0050] The material of the upper oil pressure roller 16 and the driving roller group 3 can be a single metal, stainless steel or polytetrafluoroethylene, and the roller surface is polished, and the surface friction coefficient is 0.01-0.15.

[0051] A method for oiling an oiling device for controlling the liquid rate of carbon fiber raw yarns, comprising the following steps:

[0052] The concentrated oil agent and desalted water are added to the oil agent homogenizing kettle 14 in proportion and homogenized and stirred. After the concentrated oil agent is diluted to a homogenous emulsion with a concentration of 0.5-3.0%, it is sent to the oil agent dispersing cylinder 7 through the conveying pipeline, and dispersed into the upper oil tank 1 through the oil agent dispersing cylinder 7 and the rotating blades 9. The oil agent dispersing cylinder 7 and the rotating blades 9 can realize the self-circulation of the oil agent in the upper oil tank 1 to ensure the uniform concentration of the oil agent in the oil tank. When the temperature controller 20 at the bottom of the upper oil tank 1 recognizes that the temperature is outside the set range, the liquid in the temperature control circulation tank 5 begins to enter the temperature control pipeline at the bottom of the upper oil tank 1 through the circulation pump 10. The temperature of the oil in the upper oil tank 1 is maintained within a suitable range; the polyacrylonitrile precursor filament bundle is immersed below the liquid level of the upper oil tank 1 and around the oil dispersion cylinder 7 through the traction of six driving rollers, and multiple bundles of polyacrylonitrile carbon fiber precursor filament bundles are immersed below the liquid level of the upper oil tank 1 around the oil dispersion cylinder 7 around the driving roller group 3, and the oil dispersion cylinder 7 is connected to the circulation pump 2 11 to continuously spray oil outward, and the oil is dispersed by the rotating blades 9 to make the oil pass through the bundles, so that each precursor is fully impregnated, and the bundles come out of the oil liquid surface and pass through the upper pressure roller oil and oil control jet device 19 to remove the excess oil attached to the bundles to complete the oiling. The excess oil flows into the reflux tank 2, and the oil in the reflux tank 2 enters the oil homogenization kettle 14 through the circulation pump 4 13 and mixes with the concentrated oil and desalted water to form a new homogenized oil, and then continues to be injected into the upper oil tank 1.

[0053] like Figure 1 As shown, this embodiment designs an oiling device for controlling the liquid rate of carbon fiber raw ribbon, including an oiling tank, a reflux tank, a driving roller group, an oil dispersion cylinder, a rotating blade, a circulating temperature control tank, a circulating temperature control pipeline, an oil homogenizing kettle, an upper oil pressure roller, an oil control jet device, a reflux pipeline, an oiling pipeline, and a temperature monitor.

[0054] The concentrated oil agent and desalted water are added to the oil agent homogenizing kettle in proportion and homogenized and stirred. After the concentrated oil agent is diluted to a homogeneous emulsion with a concentration of 0.5-3.0%, it is sent to the oil agent dispersing cylinder through a conveying pipeline, and is dispersed into the upper oil tank by the oil agent dispersing cylinder and the rotating blades to ensure that the concentration of the oil agent in the oil tank is uniform. When the temperature controller at the bottom of the upper oil tank recognizes that the temperature is outside the set range, the liquid in the temperature control circulation tank begins to enter the temperature control pipeline at the bottom of the upper oil tank through the circulation pump 1, so that the temperature of the oil agent in the upper oil tank is kept within a suitable range; the polyacrylonitrile precursor fiber bundle is immersed below the liquid surface of the upper oil tank and around the oil agent dispersing cylinder by the traction of six driving rollers. The oil agent dispersing cylinder is connected to the upper oil tank and the circulation pump 2 to continuously spray oil agent outwards. The oil agent is dispersed by the rotating rotating blades to make the oil agent pass through the fiber bundles, so that each fiber is fully immersed. The fiber bundle comes out of the oil agent liquid surface and passes through the lower pressure roller oil and the oil control jet device to remove the excess oil agent attached to the fiber bundles, and the oiling is completed. The excess oil flows into the reflux tank, and the oil in the reflux tank enters the oil homogenizing kettle through the circulation pump 4, mixes with the concentrated oil and desalted water to form a new homogenized oil, and then continues to be injected into the upper oil tank.

[0055] Example 1

[0056] Add the concentrated oil agent with a solid content of 25% into the oil agent homogenizing kettle, open the desalted water pipeline, make the oil-water ratio 1:9, and configure a homogenized oil agent with a concentration of 2.5%, and send it to the upper oil tank through the circulation pump three. After reaching the appropriate liquid level, close the circulation pump three, open the circulation pump two, and the oil agent circulates into the oil agent dispersion cylinder, and is dispersed into the upper oil tank through the oil agent dispersion cylinder and the rotating blades to ensure that the oil agent in the upper oil tank remains homogeneous. The temperature monitor at the bottom of the upper oil tank monitors that the temperature of the oil agent in the oil tank is 40℃, and the circulating temperature control tank starts to work. The coolant in the tank enters the cooling circulation pipeline through the circulation pump one to complete the cooling of the oil agent, and the temperature is maintained in the set range of 5~25℃. The polyacrylonitrile raw yarn bundle is pulled into the upper oil tank by six driving rollers. The oil dispersion cylinder is connected to the upper oil tank and the circulating pump sprays oil outward continuously. The oil is dispersed by the rotating blades to make the oil pass through the yarn bundle, so that each raw yarn is fully impregnated. After the yarn bundle leaves the liquid surface, it passes through the surface of the upper oil pressure roller and is subjected to the air jet pressure. The wind speed is 25m / s to control the liquid carrying rate of the yarn bundle. The excess oil on the surface of the yarn bundle is washed down into the reflux tank and enters the oil homogenizing kettle to complete the oiling of the raw yarn.

[0057] Comparative Example 1

[0058] Add the concentrated oil agent with a solid content of 25% into the oil agent homogenizing kettle, open the desalted water pipeline, make the oil-water ratio 1:9, and configure a homogenized oil agent with a concentration of 2.5%, and send it to the upper oil tank through the circulation pump three. After reaching the appropriate liquid level, turn off the circulation pump three, turn on the circulation pump two, and the oil agent circulates into the oil agent dispersion cylinder, and is dispersed into the upper oil tank through the oil agent dispersion cylinder and the rotating blades to ensure that the oil agent in the upper oil tank remains homogeneous. The temperature monitor at the bottom of the upper oil tank monitors that the temperature of the oil agent in the oil tank is 40℃, and the circulating temperature control tank starts to work. The coolant in the tank is drawn into the cooling circulation pipeline by the circulation pump one to complete the cooling of the oil agent, and the temperature is kept in the set range of 5~25℃. The polyacrylonitrile precursor yarn bundle is pulled into the upper oil tank by six driving rollers. The oil dispersion cylinder is connected to the upper oil tank and the circulating pump sprays oil outward continuously. The oil is dispersed by the rotating blades to make the oil pass through the yarn bundle, so that each precursor yarn is fully immersed. After the yarn bundle leaves the liquid surface, the liquid carrying rate is controlled by the traditional method of squeezing the upper and lower rollers at the same time. The excess oil on the surface of the yarn bundle is squeezed into the reflux tank and enters the oil homogenizing kettle to complete the oiling of the precursor yarn.

[0059] Comparative Example 2

[0060] Add concentrated oil with 25% solid content into the oil homogenizing kettle, open the desalted water pipeline, make the oil-water ratio 1:9, and prepare a homogenized oil with a concentration of 2.5%, and inject it directly into the upper oil tank through the circulation pump three. The temperature monitor at the bottom of the upper oil tank monitors that the temperature of the oil in the oil tank is 55℃. The polyacrylonitrile precursor tow enters the upper oil tank through the traction of six driving rollers. The precursor is immersed in the oil. After the tow leaves the liquid surface, it passes through the surface of the upper oil pressure roller and is subjected to the pressure of the air jet nozzle. The wind speed is 25m / s, and the liquid rate of the tow is controlled. The excess oil on the surface of the tow is washed down and flows into the reflux tank and enters the oil homogenizing kettle to complete the oiling of the precursor.

[0061] After testing, the original silk of Example 1 contains 0.80% oil, the original silk has good fiber splitting, the number of paralleling is small, the drying process has little oil stain, the fiber surface is smooth and complete after carbonization, and there is basically no melting and paralleling phenomenon. The tensile strength of 5146MPa meets the production requirements. The original silk of Comparative Example 1 contains 0.72% oil, the original silk has slightly poor fiber splitting, there is paralleling phenomenon, there is less oil stain in the drying process, there is a melting and paralleling phenomenon between the tows after carbonization, and the tensile strength is 4923MPa. The melting and paralleling phenomenon causes uneven heating of fiber carbonization, resulting in fiber defects and affecting fiber strength. The original silk of Comparative Example 2 contains 0.79% oil, the original silk has poor fiber splitting, there is paralleling phenomenon, due to the lack of temperature control process, the surface of the oil agent in the upper oil tank has a slight sticking phenomenon, the surface mucosa is taken away by the tow, causing tow adhesion and rubber particles, the drying roller sticks to the roller, and the tensile strength is 4796MPa.

[0062] like Figure 5The data show that compared with the traditional extrusion oil control method, the jet nozzle oil control method reduces the adhesion and surface damage of the tows during tow extrusion, and the produced raw silk has better fiber separation and higher tensile strength; the circulating temperature control device avoids the deterioration of the oil agent due to temperature during the raw silk production process, thereby reducing the quality of the produced raw silk.

Claims

1. An oiling device for controlling the liquid rate of carbon fiber raw yarn, characterized in that: It includes oiling module, circulating temperature control module, oil control module and oil homogenizing kettle; The oiling module includes an oiling tank, an oil dispersion cylinder, a rotating blade, and a driving roller group. The oil dispersion cylinder and the oiling tank are self-circulated in the oiling tank through a circulation pump 2; The circulating temperature control module includes a circulating temperature control tank, a circulating temperature control pipeline, a temperature monitor, and a circulating pump. The circulating temperature control pipeline is connected to the circulating temperature control tank, and the circulating temperature control pipeline is laid at the bottom of the upper oil tank. The oil control module includes an oil control jet device, an upper oil pressure roller, and a reflux tank, and the reflux tank is connected to the oil homogenizing kettle through a pipeline; The oil agent homogenizing kettle is connected with the oil agent dispersing cylinder, the upper oil tank and the reflux tank through pipelines. The oil agent homogenizing kettle is connected with the desalted water pipeline. A homogenizing stirring device is arranged in the oil agent homogenizing kettle.

2. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1 is characterized in that: The oil dispersion cylinder is fixedly arranged on the inner wall of the upper oil tank; the interior of the oil dispersion cylinder is a cavity structure, and the outer cylinder body is provided with a plurality of oil spray outlets, and the oil outlets are selected from slits, round holes or meshes; the internal cavity is connected with the upper oil tank and the oil homogenizing kettle through the second circulation pump; the oil enters the internal cavity of the oil dispersion cylinder from the upper oil tank through the second circulation pump and then flows out from the oil spray outlet, so as to realize self-circulation in the oil tank.

3. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1 is characterized in that: The rotating blades are coaxially nested with the oil dispersion cylinder, and the rotating blades are driven by a motor to rotate at a speed of 10 to 50 / min. The oil dispersion cylinder is connected to a circulation pump to continuously spray oil outward, and the oil is dispersed by the rotating blades so that the oil passes through the filament bundle, allowing each raw silk to be fully impregnated.

4. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1, characterized in that: The driving roller group is arranged around the oil dispersing cylinder, among which the No. 1 roller and the No. 6 roller of the oil tank are arranged at 10-20 cm away from the opening of the upper oil tank, with an interval of 100 cm-120 cm, and the two rollers are kept at the same height and parallel to each other; the No. 2 roller and the No. 5 roller are arranged at 30-40 cm away from the opening of the upper oil tank, with an interval of 80 cm-100 cm, and the two rollers are kept at the same height and parallel to each other; the No. 3 roller and the No. 4 roller are arranged at 50-60 cm away from the opening of the upper oil tank, with an interval of 60 cm-80 cm, and the two rollers are kept at the same height and parallel to each other; the polyacrylonitrile precursor yarn bundle is wound around the No. 1 roller, the No. 2 roller, the No. 3 roller, the No. 4 roller, the No. 5 roller and the No. 6 roller in sequence and then leaves the upper oil tank.

5. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1, characterized in that: The circulating temperature control pipe is laid in an "S" shape at the bottom of the upper oil tank. The distance between the circulating temperature control pipe and the bottom should be kept at 10 to 20 cm, and the distance between the circulating temperature control pipes should be kept at 10 to 20 cm.

6. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1, characterized in that: The oil control jet device has a certain number of jet head internal chambers, and the air outlet of the oil control jet device is in the shape of a rectangular slit, and the air outlet direction is 60° to the tangent line at the intersection of the air outlet direction and the upper oil pressure roller, and the air outlet speed of the jet nozzle is 5 to 50 m / s; The number of oil control jets and the number of chambers inside the jet head correspond to the number of tows actually produced; The oil control jet device and the upper oil pressure roller are arranged 50cm above the reflux tank.

7. The oiling device for controlling the liquid rate of carbon fiber raw material according to claim 1, characterized in that: The upper oil pressure roller and the driving roller are made of a single metal, stainless steel or polytetrafluoroethylene, the roller surface is polished, and the surface friction coefficient is 0.01 to 0.

15.

8. An oiling method for an oiling device for controlling the liquid rate of carbon fiber precursor based on any one of claims 1 to 7, characterized in that: The following steps are involved: The concentrated oil agent and desalted water are added to the oil agent homogenizing kettle in proportion and homogenized and stirred. After the concentrated oil agent is diluted to a homogenous emulsion with a concentration of 0.5-3.0%, it is sent to the oil agent dispersion cylinder through a conveying pipeline, and dispersed into the upper oil tank through the oil agent dispersion cylinder and the rotating blades. The oil agent dispersion cylinder and the rotating blades can realize the self-circulation of the oil agent in the upper oil tank to ensure the uniform concentration of the oil agent in the oil tank. When the temperature controller at the bottom of the upper oil tank recognizes that the temperature is out of the set range, the liquid in the temperature control circulation tank begins to enter the temperature control pipeline at the bottom of the upper oil tank through the circulation pump 1, so that the temperature of the oil agent in the upper oil tank is kept in an appropriate range; the polyacrylonitrile precursor tow is subjected to six driving The traction of the moving roller is immersed below the liquid surface of the upper oil tank and around the oil dispersion cylinder. Multiple bundles of polyacrylonitrile carbon fiber precursor yarns are immersed below the liquid surface of the upper oil tank around the oil dispersion cylinder. The oil dispersion cylinder is connected to the circulation pump 2 to continuously spray oil outward. The oil is dispersed by the rotating blades to make the oil pass through the yarn bundles so that each precursor yarn is fully immersed. The yarn bundle comes out of the oil liquid surface and passes through the lower pressure roller oil and the oil control jet device to remove the excess oil attached to the yarn bundles to complete the oiling; the excess oil flows into the reflux tank, and the oil in the reflux tank enters the oil homogenizing kettle through the circulation pump 4 and is mixed with the concentrated oil and desalted water to form a new homogenous oil and then continues to be injected into the upper oil tank.

9. The oiling method according to claim 8, characterized in that: When the circulating temperature control bath is working, the temperature is set to, when the temperature detector detects that the real-time temperature is less than 5°C, the temperature of the circulating bath is set to 50°C higher than the real-time temperature; when the temperature detector detects that the real-time temperature is greater than 25°C, the temperature of the circulating bath is set to 50°C lower than the real-time temperature; the liquid therein is heat transfer oil, coolant or water.

10. The oiling method according to claim 8, characterized in that: The temperature detector is set at 30 cm from the opening of the upper oil tank to detect the temperature of the liquid in the upper oil tank. The normal temperature range is set to 5-25°C. When the temperature of the oil in the upper oil tank exceeds the set minimum threshold of 5°C and the maximum threshold of 25°C, the circulation pump starts to circulate.

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