CN111058101A

CN111058101A - Continuous spinning device for oriented nanofiber yarns and using method thereof

Info

Publication number: CN111058101A
Application number: CN201911394150.4A
Authority: CN
Inventors: 俞建勇; 陈超; 覃小红; 权震震; 李艾琳
Original assignee: Donghua University
Current assignee: Donghua University
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-24

Abstract

The invention provides a continuous spinning device for oriented nanofiber yarn and a method of using the same, comprising a needle-free electrostatic spinning nozzle, a high-voltage generator, a large metal ring, a small metal ring and a winding device, the high-voltage generator is composed of The positive electrode is connected to the nozzle, the large metal ring rotates under the drive of the motor and is arranged opposite to the small metal ring, the winding device is arranged on the other side of the small metal ring and is concentric with the small metal ring, the large metal ring and the small metal ring are both Grounded, and a sprinkler head is installed below the two. In the invention, the nanofibers are oriented and deposited between large and small metal rings, the nanofibers are drawn to form a spinning triangular cone, and then drawn out from the center of the small metal rings to obtain continuous oriented nanofiber yarns, which are then collected by a winding device, thereby realizing the invention. Controlling the orientation and twisting of nanofiber yarns and continuous yarn formation improves the yield of nanofiber yarns, thereby realizing mass production of oriented nanofiber yarns.

Description

Continuous spinning device for oriented nanofiber yarns and using method thereof

Technical Field

The invention belongs to the technical field of electrostatic spinning, and particularly relates to an electrostatic spinning device for continuous oriented nanofiber yarns and a using method thereof.

Background

Nanofibers have the advantage of large specific surface area due to the extremely large aspect ratio. Nanofiber yarns exhibit anisotropy in physicochemical aspects due to fiber orientation twisting. Electrostatic spinning is currently one of the most popular and convenient nanofiber and yarn preparation technologies thereof, and has wide application fields, such as tissue engineering, wound dressing, drug release, filter materials, composite reinforced material stress sensing, energy conversion, intelligent wearing and the like. The principle of the electrostatic spinning method is that a high polymer solution is stretched and moved under the action of electrostatic force, and simultaneously a solvent volatilizes and a polymer is solidified, the process involves unsteady motion and phase state transformation of liquid drops, and the process is uncontrollable, so that a randomly arranged fiber film or fiber felt is generally obtained. However, the random arrangement of the nanofiber material greatly limits the further application of the nanofiber material due to the low mechanical properties, the single structure and the like. Especially in the fields of tissue engineering, energy conversion, stress sensing, etc. where various characteristics and functionalities are required. The oriented nanofiber yarn is more widely applied due to the excellent anisotropy, one-dimensional structure and forming capability. The spinning device of the nanofiber yarn has the problem of low yield, so that the application of the nanofiber yarn is limited. Therefore, the development of the preparation method for preparing the oriented nanofiber yarns in batches can bring great development to the application of the nanofiber yarns.

Many scholars have devoted themselves to research on the preparation method of the oriented nanofiber yarn, for example, Dalton [ Dalton PD, Polymer,2005,46, 611-. Chinese patent CN105220246A reports a nanofiber yarn spinning device combining air flow and friction spinning, which can improve the yarn yield by driving the fiber to move through the air flow motion track to achieve the purpose of orientation yarn formation, but the method is complex in device, and twisting by using the friction method may cause the quality of the yarn to be reduced, and the twisting process is not controllable. The other method utilizes the principle of conjugate electrostatic spinning and is provided with a plurality of needles, the method can continuously form yarns, and the orientation and twisting processes are controllable, but the yield is low. Therefore, in the continuous batch preparation method of the nanofiber yarn at the present stage, the problem that the yarn quality and the yield are difficult to guarantee simultaneously exists.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an oriented nanofiber continuous spinning device and a using method thereof, so that the control of the orientation and twisting of nanofiber yarns is realized, the yarns are continuously formed, the yield of the nanofiber yarns is improved, and the batch production is realized.

The invention provides a continuous spinning device of oriented nanofiber yarns, which comprises a needle-free electrostatic spinning nozzle, a high-voltage generator, a liquid storage tank, a large metal ring, a small metal ring, a winding device and an insulating base, wherein the needle-free electrostatic spinning nozzle is fixed on an insulating sleeve and is used for supplying liquid through a hose by the liquid storage tank, and the hose is provided with a peristaltic pump and is used for controlling the liquid supply amount and the liquid supply speed of the needle-free electrostatic spinning nozzle; the anode of the high-voltage generator is connected with the needle-free electrostatic spinning nozzle through a metal wire; the large metal ring is rotatably fixed on the insulating base through an insulating rod I and is driven by the motor and the transmission device to rotate; the small metal ring is fixed on the insulating base through an insulating rod II, and the winding device is arranged on the other side, opposite to the large metal ring, of the small metal ring and is concentric with the small metal ring; the large metal ring and the small metal ring are both grounded; the center projections of the motor, the insulating rod I, the needle-free electrostatic spinning nozzle, the insulating rod II and the winding device are on the same horizontal line.

Furthermore, the needle-free electrostatic spinning nozzle is arranged below the large metal ring and the small metal ring.

Furthermore, the outer diameter of the large metal ring is 10-30cm, the inner diameter is 9-29cm, the outer diameter of the small metal ring is 1.5-2cm, the inner diameter is 1.2-1.7cm, the distance between the large metal ring and the small metal ring is adjustable, and the adjusting distance is 5-100 cm. .

Furthermore, the large metal ring and the small metal ring are solid stainless steel circular rings.

Furthermore, the transmission device consists of two belt pulleys arranged on the rotating shaft of the motor and the axle center of the large metal ring and a belt sleeved on the belt pulleys. The belt transmission has the advantages of simple structure, low manufacturing cost, convenient installation and maintenance, stable operation and lower noise during working.

Furthermore, the insulating base, the insulating sleeve, the insulating rod I and the insulating rod II are all made of polytetrafluoroethylene materials.

Furthermore, the rotating speed of the motor is 5rpm-9000rpm, and the rotating speed of the winding device is 0.1m/min-100 m/min.

Further, the rotation speed of the peristaltic pump is 10-500 rpm.

The invention also comprises a use method of the batch oriented nanofiber continuous spinning device, which comprises the following steps:

injecting the spinning solution into a liquid storage tank, conveying the spinning solution by rotating a peristaltic pump, and adjusting the flow by adjusting the rotating speed of the peristaltic pump so that the liquid level of the spinning solution on the needle-free electrostatic spinning nozzle reaches a critical state of saturation and overflow;

b, opening a high-voltage generator to apply high voltage to the needle-free electrostatic spinning nozzle, so that a plurality of jet flows are sprayed out from the needle-free electrostatic spinning nozzle;

inducing the orientation arrangement of the nano fibers through an electric field formed between the large metal ring and the small metal ring, turning on a motor to drive the large metal ring to rotate, and twisting the oriented nano fibers;

and D, drafting the nano fibers from the small metal ring, inducing the nano fibers to form a spinning triangular cone, leading out from the center of the small metal ring to obtain continuous oriented nano fiber yarns, and collecting the continuous oriented nano fiber yarns through a winding device.

Furthermore, in the step D, the glass rod is used for drawing the nano-fibers, the deposited nano-fibers are pulled out from one side of the small metal ring and collected on a winding device, or a cotton yarn is threaded into the small metal ring from the large metal ring and is threaded out of the small metal ring and is wound on the winding device to be used as a core yarn for drawing the nano-fibers.

The invention deposits the nano fiber orientation between the large and small metal rings, draws the nano fiber to form a spinning triangular cone, then leads out from the center of the small metal ring to obtain the continuous orientation nano fiber yarn, and collects the yarn through the winding device, thereby realizing the control of the orientation and twisting of the nano fiber yarn and the continuous yarn formation, improving the yield of the nano fiber yarn and further realizing the batch production of the orientation nano fiber yarn.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic front view of a large metal ring according to the present invention;

FIG. 3 is a side view of a large metal ring according to the present invention;

fig. 4 is a front view of the needleless jet of the present invention;

FIG. 5 is a cross-sectional view of a needleless jet head of the present invention.

1. The needle-free electrostatic spinning nozzle comprises a needle-free electrostatic spinning nozzle body 2, an insulating sleeve 3, a large metal ring 4, insulating rods I and 5, a transmission device 6, a motor 7, a small metal ring 8, insulating rods II and 9, a winding device 10, a high-voltage generator 11, a liquid storage tank 12, a peristaltic pump 13 and an insulating base.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described with reference to the attached drawings. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Example one

As shown in FIG. 1, the present embodiment comprises a needle-free electrostatic spinning nozzle 1, an insulating sleeve 2, a large metal ring 3, an insulating rod I4, a transmission device 5, a motor 6, a small metal ring 7, an insulating rod II8, a winding device 9, a high voltage generator 10, a liquid storage tank 11, a peristaltic pump 12 and an insulating base 13. The needle-free electrostatic spinning nozzle 1 is fixed on the insulating sleeve 2, liquid is supplied from the liquid storage tank 11 through a hose, and the hose is provided with a peristaltic pump 12 for controlling the liquid supply amount and the liquid supply speed of the needle-free electrostatic spinning nozzle 1; the anode of the high-voltage generator 10 is connected with the needle-free electrostatic spinning nozzle 1 through a metal wire; the large metal ring 3 is fixed on the insulating base 13 through an insulating rod I4, the motor 6 drives the large metal ring 3 to rotate through the transmission device 5, the transmission device 5 consists of two belt pulleys arranged on the rotating shaft of the motor 6 and the axle center of the large metal ring 3 and a belt sleeved on the belt pulleys, and when the rotating shaft of the motor 6 rotates, the belt pulleys arranged on the large metal ring 3 are driven to rotate through the belt pulleys and the belt, so that the large metal ring 3 is driven to rotate together; the small metal ring 7 is fixed on the insulating base 13 through an insulating rod II8, and the winding device 9 is arranged on the other side of the small metal ring 7 relative to the large metal ring 3 and is concentric with the small metal ring 7; the large metal ring 3 and the small metal ring 7 are both grounded; the center projections of the motor 6, the insulating rod I4, the needle-free electrostatic spinning nozzle 1, the insulating rod II8 and the winding device 9 are on the same horizontal line, the needle-free electrostatic spinning nozzle 1 is arranged below the large metal ring 3 and the small metal ring 7, the large metal ring 3 and the small metal ring 7 are solid stainless steel circular rings, the outer diameter of the large metal ring 3 is 10-30cm, the inner diameter of the large metal ring is 9-29cm, the outer diameter of the small metal ring 7 is 1.5-2cm, the inner diameter of the small metal ring 7 is 1.2-1.7cm, the distance between the large metal ring 3 and the small metal ring 7 is adjustable, and the adjusting distance is 5-100 cm. The insulating base 13, the insulating sleeve 2, the insulating rod I4 and the insulating rod II8 are all made of polytetrafluoroethylene. The rotating speed of the motor 6 is 5rpm-9000rpm, the rotating speed of the winding device 9 is 0.1m/min-100m/min, and the rotating speed of the peristaltic pump 12 is 10-500 rpm.

When the spinning solution is used, a certain amount of PAN is dissolved in DMF to prepare a spinning solution with the mass fraction of 12%, 14% or 16%, the spinning solution is injected into a liquid storage tank 11, a switch of a peristaltic pump 12 is turned on, the rotating speed of the peristaltic pump 12 is adjusted to be 60rpm, the spinning solution is slowly added into a needle-free electrostatic spinning nozzle 1 through a hose, when the liquid level of the spinning solution reaches a critical state of saturation and overflow, a switch of a high-voltage generator 10 is turned on, the spinning voltage is slowly increased to be adjusted to generate jet flow, the generated nanofibers are deposited between a large metal ring 3 and a small metal ring 7, at the moment, a switch of a motor 6 is turned on, the rotating speed is adjusted to be 300rpm, and the nanofibers start to twist. The deposited nanofibers are pulled out from the small metal ring 7 side by drawing with a glass rod and collected on the winding device 9, the winding device 9 is opened and switched on, and the aligned nanofiber yarn is continuously collected by adjusting to a proper speed.

Example two

The structure of the present embodiment is the same as that of the first embodiment, except for the use method. When the cotton yarn winding device is used, a cotton yarn penetrates into the small metal ring 7 from the large metal ring 3 and then penetrates out, and then is wound on the winding device 9 to be used as a core yarn, then dissolving a certain amount of PAN in DMF to prepare spinning solution with the mass fraction of 10%, injecting the spinning solution into a liquid storage tank 11, turning on a switch of a peristaltic pump 12, adjusting the rotating speed of the peristaltic pump 12 to be 100rpm, slowly adding the spinning solution into a needle-free electrostatic spinning nozzle 1 through a hose until the liquid level of the spinning solution reaches a critical state of saturation and overflow, turning on a switch of a high voltage generator 10, slowly increasing spinning voltage to adjust jet flow generation, depositing the generated nanofiber between the large metal ring 3 and the small metal ring 7 in an oriented manner, turning on a switch of a motor 6 at the moment, adjusting the rotating speed to 200rpm, depositing the nanofiber on the surface of cotton yarn, and twisting is started, a winding device 9 is switched on, and the oriented nanofiber core-spun yarn is continuously collected after being adjusted to a proper speed.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims

1. A continuous spinning device for oriented nanofiber yarn, comprising a needle-free electrospinning nozzle (1), a high-voltage generator (10), a liquid storage tank (11), a large metal ring (3), a small metal The ring (7), the winding device (9) and the insulating base (13) are characterized in that the needle-free electrospinning nozzle (1) is fixed on the insulating sleeve (2), and is connected by a liquid storage tank (11) ) liquid supply through a hose, the hose is provided with a peristaltic pump (12) for controlling the liquid supply amount and the liquid supply speed of the needle-free electrospinning nozzle (1); the high-voltage generator (10) The positive electrode is connected to the needle-free electrospinning nozzle (1) through a metal wire; the large metal ring (3) is rotatably fixed on the insulating base (13) through the insulating rod I (4), and is connected to the motor (6) and the driving device (5) to rotate; the small metal ring (7) is fixed on the insulating base (13) through the insulating rod II (8), and the winding device (9) is arranged on the small metal ring (7). ) relative to the other side of the large metal ring (3) and concentric with the small metal ring (7); the large metal ring (3) and the small metal ring (7) are both grounded; the motor (6), the insulating rod The centers of I (4), the needleless electrospinning nozzle (1), the insulating rod II (8), and the winding device (9) are projected on the same horizontal line.

2. The continuous spinning device for oriented nanofiber yarn according to claim 1, wherein the needle-free electrospinning nozzle (1) is placed on a large metal ring (3) and a small metal ring (7) ) below.

3. The continuous spinning device of oriented nanofiber yarn according to claim 1, characterized in that, the outer diameter of the large metal ring (3) is 10-30cm, the inner diameter is 9-29cm, and the small metal ring (7) The outer diameter is 1.5-2cm, the inner diameter is 1.2-1.7cm, the distance between the large metal ring (3) and the small metal ring (7) is adjustable, and the adjustment distance is 5-100cm.

4 . The continuous spinning device for oriented nanofiber yarns according to claim 3 , wherein the large metal ring ( 3 ) and the small metal ring ( 7 ) are solid stainless steel rings. 5 .

5. The continuous spinning device for oriented nanofiber yarn according to claim 1, characterized in that, the transmission device (5) consists of two mounted on the rotating shaft of the motor (6) and the axis of the large metal ring (3) The pulley on the pulley and the belt on the pulley are composed.

6. The continuous spinning device for oriented nanofiber yarns according to claim 1, wherein the insulating base (13), the insulating sleeve (2), the insulating rod I (4), the insulating rod II (8 ) are made of PTFE.

7 . The continuous spinning device for oriented nanofiber yarns according to claim 1 , wherein the rotating speed of the motor is between 5 rpm and 9000 rpm, and the rotating speed of the winding device is between 0.1 m/min and 100 m/min. 8 .

8. The continuous spinning device for oriented nanofiber yarns according to claim 1 or 7, wherein the rotational speed of the peristaltic pump (12) is 10-500 rpm.

9. A method of using the continuous spinning device of oriented nanofiber yarn as claimed in claim 1, characterized in that, comprising the following steps:

A: The spinning solution is injected into the liquid storage tank (11), the spinning solution is rotated and transported by the peristaltic pump (12), and the flow rate is adjusted by adjusting the rotational speed of the peristaltic pump (12) to make the spinning on the needle-free electrospinning nozzle (1) The liquid level of the silk solution reaches the critical state of saturation and overflow;

B: turn on the high-voltage generator (10) to apply high voltage to the needle-free electrospinning nozzle (1), so that a plurality of jets are ejected from the needle-free electrospinning nozzle (1);

C: The nanofibers are oriented and aligned by the electric field formed between the large metal ring (3) and the small metal ring (7), the motor (6) is turned on to drive the large metal ring (3) to rotate, and the oriented nanofibers are twisted;

D: the nanofibers are drawn from the small metal ring (7), the nanofibers are induced to form a spinning triangular pyramid, and are drawn out from the center of the small metal ring (7) to obtain continuously oriented nanofiber yarns, which are passed through the winding device (9) )collect.

10. The method for using the continuous spinning device of oriented nanofiber yarns as claimed in claim 9, wherein in the step D, the nanofibers are drawn with a glass rod, and the deposited nanofibers are removed from the small metal ring. (7) Pull out one side and collect it on the winding device (9), or thread a cotton yarn from the large metal ring (3) into the small metal ring (7) and wrap it on the winding device ( 9), the nanofibers are drawn as core yarns.