CN214142842U - Large-tow carbon fiber precursor washing device - Google Patents
Large-tow carbon fiber precursor washing device Download PDFInfo
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- CN214142842U CN214142842U CN202022440534.XU CN202022440534U CN214142842U CN 214142842 U CN214142842 U CN 214142842U CN 202022440534 U CN202022440534 U CN 202022440534U CN 214142842 U CN214142842 U CN 214142842U
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Abstract
The utility model discloses a large tow carbon fiber precursor washing device and a washing method, wherein the device comprises a plurality of washing units, each washing unit comprises a washing tank, a spraying unit, a pump and a drawing roller set, the water discharging end of the pump is connected with the spraying unit arranged above the washing tank through a liquid discharging pipe, and the spraying pipe of the spraying unit is arranged towards the fibers on the drawing roller set; the method comprises 1) adjusting device parameters; 2) and (5) supplying fiber for washing, finishing washing and entering the next working procedure. Through the utility model discloses a scheme has solved the homogeneity of big silk bundle precursor washing more than 24K and the high efficiency of washing, reduces remaining of solvent in the nascent fibre. The utility model discloses a big silk bundle precursor solvent that washing method obtained remains lowly, and the residual rate that can realize solvent in the every fibre of big silk bundle precursor in addition is even, can guarantee among the industrial production, on a production line, the solvent of the big silk bundle precursor between the position is spun to the difference remains ground homogeneity.
Description
Technical Field
The utility model relates to a polyacrylonitrile fiber makes technical field, concretely relates to big silk bundle carbon fiber precursor washing device.
Background
The carbon fiber which is a new material has the excellent performance and plays an increasingly important role in the adjustment of industrial structures in China and the replacement of traditional materials. With the leapfrog increase of the demand of the large-tow carbon fiber, the continuous breakthrough of the large-tow carbon fiber preparation technology and the industrialization technology is pulled. Compared with small tows, the preparation technology of the large-tow carbon fiber is more difficult in multiple preparation system links of the large-tow carbon fiber.
The high-performance precursor is the premise for preparing the high-performance carbon fiber. The water washing of the carbon fiber precursor is an important link of precursor production. No matter which method is adopted to produce the precursor, the residue of the solvent in the precursor affects the quality of the precursor, and finally the performance of the carbon fiber finished product is reduced. Therefore, each strand manufacturer will be dedicated to an effective water washing method to reduce the solvent residue in the strands.
The process of washing the protofilament is a process of double diffusion of solvent and water. The factors influencing the process are many, on one hand, the factors come from the protofilament, including the composition of protofilament polymer, the molecular weight of the polymer, the solid content of spinning solution and the like; on the other hand, the method is influenced by the technological parameter setting of the water washing procedure, including the water washing temperature, the water washing flow and the like; on the other hand, the method is influenced by the washing method, washing equipment, and the like.
The existing carbon fiber precursor washing methods and washing equipment are more, and the methods comprise immersion type, spray type, ultrasonic type, beating type and the like. The water washing process is a double-diffusion process, a solvent removing process and a fiber shrinking process, and the fibers are easily damaged in an ultrasonic mode and a beating mode, so that the original filaments generate broken filaments and broken filaments. The mode of dipping or spraying is adopted, the washing efficiency is low, and the water consumption is large.
Chinese patent CN 106319689A discloses a carbon fiber precursor washing device and a washing method. The utility model discloses a carbon fiber precursor washing device arranges a plurality of wash tanks from top to bottom, and carbon fiber precursor is according to "S" shape from bottom to top successive layer through the guide roller of each wash tank, through a plurality of guide roller rotational speed differences, carries out the drafting in advance at the washing in-process to carbon fiber precursor, extrudes the inside solvent of infiltration carbon fiber precursor, improves the washing effect. The water washing device with the structure is suitable for washing the small tow protofilaments, and the water consumption is large.
Chinese patent CN 107268215 a discloses a carbon fiber precursor washing device and method. The utility model discloses a carbon fiber precursor washing device and washing method. The device comprises a rinsing machine guide wire roller set, a circulating water tank, a spray water pump, a spray nozzle, a rinsing water tank and the like; the tows are subjected to acid washing treatment and then pass through a washing machine, spray water is sprayed out from a spray nozzle to form atomized water to wash the tows, the tows enter a rinsing tank to be rinsed after being washed, and the advancing direction of the tows is opposite to the flowing direction of desalted water in the rinsing tank. The utility model discloses a can with reduce the sodium ion in the silk bundle, improve carbon fiber precursor's quality. The washing device with the flow structure cannot fully utilize washing water, has high energy consumption, and is not suitable for washing the large tow protofilament because the protofilament is washed unevenly.
The application of the low-cost large-tow carbon fiber is the key for developing the technical research of the low-cost carbon fiber composite material. The carbon fiber with large tows has the greatest advantages of greatly improving the single-wire productivity of the carbon fiber under the same production condition and realizing the low cost of production relative to the small tows. The difficulty of meeting the uniformity of each fiber is met along with the increase of the number of the tows, and the difficulty is greatly increased compared with that of small tows.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a large-tow carbon fiber precursor washing device which can solve the problems.
The purpose of the utility model is realized by adopting the following technical scheme:
a large-tow carbon fiber precursor washing device comprises a plurality of washing units, wherein each washing unit comprises a washing tank, a spraying unit, a pump and a drawing roller set, the water inlet end of the pump is communicated with a water outlet formed in the bottom of the washing tank through a liquid inlet pipe, and the water outlet end of the pump is connected with the spraying unit arranged above the washing tank through a liquid discharge pipe, so that washing liquid in the washing tank is circulated; the spraying pipe of the spraying unit is arranged towards the fibers on the drawing roller set so as to spray rinsing liquid to the fibers conveyed on the drawing roller set; wherein the number n of the water washing units satisfies the formula: residual solvent in the fiber (solvent amount in the nascent fiber upon washing x) (1-average removal rate of solvent in each washing tank)n<0.002％。
Preferably, each washing unit is provided with a drawing roller set, each drawing roller set comprises an upper roller, a lower front roller and a lower rear roller, the upper roller is arranged above the inlet of the washing tank, the middle of the lower front roller tank is close to the front end, and the lower rear roller is arranged in the washing tank and is close to the rear end; wherein the included angle alpha between the upper fiber surface A conveyed by the carbon fiber precursor where the lower rear roller of the previous washing unit and the upper roller of the next washing unit are positioned and the horizontal plane is more than or equal to 30 degrees and less than or equal to 60 degrees; the included angle gamma between the lower fiber surface B conveyed by the carbon fiber precursor where the upper roller and the lower front roller are located in the same washing unit and the horizontal plane is more than or equal to alpha.
Preferably, alpha is 40 DEG-45 deg.
Preferably, each water washing unit is provided with independent variable frequency control of the drawing roller set so as to independently adjust the water washing speed; the average solvent removal rate in each rinsing bath is 78-93%, preferably 85-88%.
Preferably, spraying units are arranged on the front surface of the fiber on the upper fiber surface A and the back surface of the fiber on the lower fiber surface B; the included angles between the spraying center of the spraying unit and the upper fiber surface A and the lower fiber surface B are beta, the included angle beta is more than or equal to 30 degrees and less than or equal to 60 degrees, and the preferred included angle beta is more than or equal to 40 degrees and less than or equal to 45 degrees.
Preferably, a plurality of spray pipes are arranged on the spray unit side by side, a nozzle is arranged at the front end of each spray pipe, and the spray direction of the nozzle is controlled by adjusting the spray pipes.
Preferably, the number of spray pipes on each spray unit is twice the number of spun yarns.
Preferably, spraying ports are arranged, and a spraying pipe is arranged on each spraying port.
Preferably, the spraying angle of the nozzle is 90 degrees, and the vertical distance from water spraying to the fiber is 100 mm; the effective immersion length L of the fiber in the rinsing bath is 1.5 m-3.5 m; the spray pipe is a corrosion-resistant flexible shaping hose; the speed of the drafting roller set is set to control the drafting rate in the rinsing bath to be 90-99%. The effective immersion length L is preferably 2.0m or more and L or less than 2.5 m; the draft ratio is preferably 95% to 96%.
Compared with the prior art, the beneficial effects of the utility model reside in that: through the utility model discloses a scheme has solved the homogeneity of big silk bundle precursor washing more than 24K and the high efficiency of washing, reduces remaining of solvent in the nascent fibre. The utility model discloses a washing method adopts is big silk bundle carbon fiber precursor washing device, and the big silk bundle precursor solvent that obtains is remained lowly, can realize moreover that the residual rate of solvent is even in the every fibre of big silk bundle precursor, can guarantee in the industrial production, on a production line, the solvent of the big silk bundle precursor between the position is spun to the difference remains ground homogeneity.
Drawings
FIG. 1 is a schematic view of a water washing apparatus;
fig. 2 is a schematic view of a spray unit.
Wherein: 1. fibers; 2. a drawing roller set; 3. a rinsing bath; 4. a pump; 5. a spraying unit; 21. upper roll; 22. a lower front roller; 23. a lower back roller; 51. a shower pipe; 52. and (4) a nozzle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the process of preparing the carbon fiber large tow protofilament by using polyacrylonitrile, the obtained polyacrylonitrile stock solution is extruded to form nascent fiber, and the nascent fiber needs to be washed by water to remove a solvent in the nascent fiber. Therefore, referring to fig. 1, a large-tow carbon fiber precursor washing device is provided, the washing device comprises a plurality of washing units, each washing unit comprises a washing tank 3, a spraying unit 5, a pump 4 and a drawing roller set 2, a water inlet end of the pump 4 is communicated with a water outlet formed in the bottom of the washing tank 3 through a liquid inlet pipe, and a water outlet end of the pump 4 is connected with the spraying unit 5 arranged above the washing tank 3 through a liquid outlet pipe, so that washing liquid in the washing tank 3 is circulated; the spray pipe 51 of the spray unit 5 is arranged towards the fiber 1 on the drawing roller group 2, so as to spray rinsing liquid to the fiber being conveyed on the drawing roller group 2; wherein the number n of the water washing units satisfies the formula: residual solvent in the fiber (solvent amount in the nascent fiber upon washing x) (1-average removal rate of solvent in each washing tank)n<0.002％。
Wherein, the rinsing bath of each rinsing unit is not provided with an overflow plate, and the rinsing water in the rinsing bath 3 is completely updated through the pump 4. Hot pure water is taken as a washing medium and enters from the last washing unit, is pumped into the previous washing unit through a pump 4, and sequentially runs in a reverse direction with the fiber 1; the average solvent removal rate in each rinsing bath 3 is 78-93%.
Wherein, every washing unit sets up draft roller set 2, and every draft roller set 2 includes one and goes up roller 21, a lower preceding roller 22 and a lower back roller 23, go up roller 21 and set up in the top of wash bowl 3 entry, lower preceding roller 22 sets up and is close to the front end department in wash bowl 3 groove, back roller 23 sets up and is close to the rear end department in wash bowl 3 down.
Furthermore, the included angle alpha between the upper fiber surface A conveyed by the carbon fiber precursor where the lower rear roller 23 of the previous washing unit and the upper roller 21 of the next washing unit are located and the horizontal plane is more than or equal to 30 degrees and less than or equal to 60 degrees, preferably more than or equal to 40 degrees and less than or equal to 45 degrees.
The included angle gamma between the lower fiber surface B conveyed by the carbon fiber precursor where the upper roller 21 and the lower front roller 22 are located in the same water washing unit and the horizontal plane is not less than alpha.
Wherein, each washing unit is provided with independent variable frequency control of the drawing roller set 2 so as to independently adjust the washing speed; the average solvent removal rate in each rinsing bath 3 is 78-93%, preferably 85-88%.
Further, spraying units 5 are arranged on the front surface of the fiber on the upper fiber surface A and the back surface of the fiber on the lower fiber surface B; the included angles between the spraying center of the spraying unit 5 and the upper fiber surface A and the lower fiber surface B are beta, the included angle beta is more than or equal to 30 degrees and less than or equal to 60 degrees, and preferably more than or equal to 40 degrees and less than or equal to 45 degrees.
Wherein, a plurality of spray pipes 51 are arranged side by side on the spray unit 5, a nozzle 52 is arranged at the front end of each spray pipe 51, and the spray direction of the nozzle 52 is controlled by adjusting the spray pipes 51. The spray water pressure of the nozzle 52 is 0.10 to 0.18MPa, preferably 0.15MPa
Further, the number of shower pipes 51 on each shower unit 5 is twice the number of spun yarns. In one embodiment, 2 showers 51 and corresponding nozzles 52 are provided for each of the shower ports of the shower unit 5.
Further, the spray angle of the spray nozzles 52 is 90 °, and the vertical distance from the sprayed water to the fibers is 100 mm; the effective immersion length L of the fiber 1 in the rinsing bath 3 is 1.5 m-3.5 m, preferably 2.0m L2.5 m. The spray pipe is a corrosion-resistant flexible pipe capable of being bent and shaped, namely a corrosion-resistant material is adopted, the spray pipe is not very soft and can be bent, and the spray direction of a nozzle on the spray pipe can be controlled. The speed of the drafting roller group is set to control the drafting rate in the water washing tank 3 to be 90-99%.
The method for preparing the polyacrylonitrile-based large-tow carbon fiber precursor by using the water washing device comprises the following steps.
1) Adjusting device parameters, namely setting the number, the zigzag angle and the distance between the upper fiber surface B and the lower fiber surface B of the spraying pipes 51 of the spraying unit 5 and setting the speed of the drafting roller group 2 to adjust the drafting rate in the rinsing bath according to the fiber rinsing requirement and the spinning number; matching the removal rate of the solvent in the corresponding fiber washing modulation rinsing bath and supplying pure hot water as a rinsing medium;
2) and (3) supplying fiber for washing, wherein the fiber enters the drawing roller group 2 of the first washing unit, is sprayed by the spraying unit 5 and then enters the washing tank 3, sequentially runs, and is discharged from the drawing roller of the last unit, washed and enters the next procedure.
For verification of the comparison, see the different examples and comparative examples in the table below.
Table-different examples and comparative examples of water washing apparatus
Therefore, after the number of single strands of the original filament is increased, the residual quantity of the solvent in the fiber can still be ensured to be low, the solvent residual rate among the fibers in each strand can be uniform, and the solvent residual rate among each strand on one spinning line is uniform. Namely, adopt the utility model discloses the big silk bundle raw silk of production, the residual rate of solvent < 0.002%, the solvent residual rate CV between the different fibre in per silk bundle < 1%, between the different spinning positions, the solvent residual rate CV of per silk bundle < 2%.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The utility model provides a big silk bundle carbon fiber precursor washing device which characterized in that: the washing device comprises a plurality of washing units, each washing unit comprises a washing tank (3), a spraying unit (5), a pump (4) and a drawing roller set (2), the water inlet end of the pump (4) is communicated with a water outlet formed in the bottom of the washing tank (3) through a liquid inlet pipe, and the water outlet end of the pump (4) is connected with the spraying unit (5) arranged above the washing tank (3) through a liquid outlet pipe, so that the washing liquid in the washing tank (3) is circulated; the spraying pipe (51) of the spraying unit (5) is arranged towards the fiber (1) on the drawing roller set (2) so as to spray rinsing liquid to the fiber being conveyed on the drawing roller set (2); wherein the number n of the water washing units satisfies the formula: residual solvent in the fiber (solvent amount in the nascent fiber upon washing x) (1-average removal rate of solvent in each washing tank)n<0.002％。
2. The large tow carbon fiber precursor water washing device according to claim 1, wherein: each water washing unit is provided with a drawing roller set (2), each drawing roller set (2) comprises an upper roller (21), a lower front roller (22) and a lower rear roller (23), the upper roller (21) is arranged above an inlet of the water washing tank (3), the lower front roller (22) is arranged in the water washing tank (3) and close to the front end, and the lower rear roller (23) is arranged in the water washing tank (3) and close to the rear end;
wherein the included angle alpha between the upper fiber surface A conveyed by the carbon fiber precursor where the lower rear roller (23) of the previous washing unit and the upper roller (21) of the next washing unit are positioned and the horizontal plane is more than or equal to 30 degrees and less than or equal to 60 degrees;
the included angle gamma between the lower fiber surface B conveyed by the carbon fiber precursor where the upper roller (21) and the lower front roller (22) are positioned in the same washing unit and the horizontal plane is not less than alpha.
3. The large tow carbon fiber precursor water washing device according to claim 2, wherein: each washing unit is provided with independent variable frequency control of the drawing roller set (2) so as to independently adjust the washing speed; the average removal rate of the solvent in each rinsing bath (3) is 78-93 percent.
4. The large tow carbon fiber precursor water washing device according to claim 2, wherein: spraying units (5) are arranged on the front surface of the fiber on the upper fiber surface A and the back surface of the fiber on the lower fiber surface B; the included angles between the spraying center of the spraying unit (5) and the upper fiber surface A and the lower fiber surface B are beta, and the included angle beta is more than or equal to 30 degrees and less than or equal to 60 degrees.
5. The large tow carbon fiber precursor water washing device according to claim 4, wherein: a plurality of spray pipes (51) are arranged on the spray unit (5) side by side, a spray nozzle (52) is arranged at the front end of each spray pipe (51), and the spray direction of the spray nozzle (52) is controlled by adjusting the spray pipes (51).
6. The large tow carbon fiber precursor water washing device according to claim 5, wherein: the number of the spray pipes (51) on each spray unit (5) is twice of the number of spun yarns.
7. The large tow carbon fiber precursor water washing device according to claim 5, wherein: the shower is corrosion-resistant flexible pipe of can buckling and stereotyping.
8. The large tow carbon fiber precursor water washing device according to claim 5, wherein: the spraying angle of the nozzle (52) is 90 degrees, and the vertical distance from water spraying to the fiber is 100 mm; the effective immersion length L of the fiber (1) in the rinsing bath (3) is 1.5-3.5 m; the speed of the drafting roller set is set to control the drafting rate in the rinsing bath (3) to be 90-99%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022440534.XU CN214142842U (en) | 2020-10-28 | 2020-10-28 | Large-tow carbon fiber precursor washing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022440534.XU CN214142842U (en) | 2020-10-28 | 2020-10-28 | Large-tow carbon fiber precursor washing device |
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| CN214142842U true CN214142842U (en) | 2021-09-07 |
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