CN106283219B - A kind of melt electrospun nanofiber of spininess rotation twisting is twisted thread preparation facilities and method - Google Patents

Abstract

The invention relates to a multi-needle rotary twisting melt electrospinning nano-twist preparation device and method, belonging to the field of electrospinning. The device mainly includes: heating rod, central shaft, runner, corner head, extruder, splitter plate, ball, worm, thin-walled container, copper ring, conical deflector, single-needle nozzle, worm gear, acrylic with holes plate, electrode plate, high-voltage electrostatic generator, receiving roller, etc. In the device and method of the present invention, the conical deflector is connected with the central shaft by threads, and is arranged coaxially with the thin-walled container. A copper ring is arranged between the upper part of the needle and the flow channel as a sealing device. Multiple single-needle nozzles are arranged circularly to improve spinning efficiency and output, and are threaded to the bottom plate of the thin-walled container for easy replacement and cleaning. The number of fibers can be controlled by replacing the single-needle nozzles with needle plugs. The worm gear drive drives the single-needle nozzle to rotate, the twist is controllable, the number of fibers is controllable, and the fiber diameter is uniform, which can improve the applicability of the nano-twisted yarn and meet the needs of different fields.

Description

A kind of multi-needle rotary twisting melt electrospinning nano twisted yarn preparation device and method

technical field

The invention relates to a multi-needle rotary twisting melt electrospinning nano-twist preparation device and method, belonging to the field of electrospinning.

Background technique

Now that we have entered the era of nanotechnology, electrospinning has been recognized as the simplest and most effective method for preparing nanofibers. At present, the key issues hindering the industrialization of melt electrospinning are the output of fibers, the further reduction of fiber diameter and the Uniformity of diameter.

Nanofiber twisted wire is currently another main form of nanofiber assembly besides nanofiber mat, and has potential application value in many important fields. Varabhas et al. designed a porous tube electrospinning device. This method uses a porous hollow tube with both ends sealed, and the electrodes are placed in the tube. The electrode contact area inside the tube is small, and it is difficult to form a uniform electric field, and even interfere with the fluid flow characteristics. There is also the problem that the small holes are easily blocked. Chinese patent (Patent No.: 201210554168.8) is a glass fiber twisting process. Although the twisting effect can be achieved, the twisting stability is low, the orientation and uniformity are poor, and the twisting degree cannot be controlled.

In view of the above problems, the present invention proposes a multi-needle rotary twisting melt electrospinning nano twisted yarn preparation device and method. The nano-twisted wire prepared by the device is regular, the twist is controllable, the number of fibers is controllable, and the fiber diameter is uniform, which improves the applicability and mechanical properties of the nano-twisted wire, increases its secondary processability, and expands the application field of nano-fibers. .

Contents of the invention

The invention proposes a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device and method, in which a flow channel that narrows sequentially from top to bottom is formed between a central axis and a splitter plate to ensure the uniformity of feeding. A copper ring is arranged between the upper part of the needle and the flow channel as a sealing device. Multiple single-needle nozzles are evenly distributed in a ring to improve spinning efficiency and output, and avoid the problem of mechanical adhesion during twisting. The single-needle nozzle is connected to the bottom plate of the container by thread, which is convenient for replacement and cleaning, and the number of fibers can be controlled by replacing the single-needle nozzle with a needle plug. The single-needle nozzle rotates, the jet oscillates and whips rapidly in the air, and the fibers are further stretched and refined. A uniform electric field is formed between the hollow annular electrode plate and the single-needle nozzle to ensure uniform fiber diameter. Adjusting the rotation speed of the motor can control the twist, prepare highly ordered nano-twisted wires, and improve the mechanical properties of nanofibers. The nano-twisted wire prepared in the whole process is regular, with controllable twist, controllable number of fibers, and uniform fiber diameter, which improves the applicability of the nano-twisted wire and meets the needs of different fields.

The technical solution to achieve the above purpose is: a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device, which mainly includes: heating rod, central shaft, flow channel, corner head, extruder, splitter plate, ball , worm, thin-walled container, copper ring, conical deflector, single-needle nozzle, worm gear, perforated acrylic plate, electrode plate, high-voltage electrostatic generator, receiving roller, etc. The extruder is connected with the corner die, and the lower end of the corner die extends into the runner. The conical deflector is threadedly connected with the central shaft, and arranged coaxially with the thin-walled container. The lower part of the side wall of the thin-walled container is thickened to form a worm gear, which forms a transmission device with a worm motor, and the bottom is connected with a single-needle nozzle arranged in a ring through a thread. Balls are used in the matching part of the diverter plate and the thin-walled container to change the sliding friction into rolling friction and reduce the friction force during rotation. The annular electrode plate is connected with a high-voltage electrostatic generator, placed on an acrylic plate with holes, and forms a high-voltage electrostatic field with the receiving roller. The melt flows out from multiple single-needle nozzles at the same time. Under the action of the electric field, the fibers fall onto the electrode plate. At the same time, the worm gear drives the needles to rotate, so that the fibers achieve the effect of drafting and bundling. The fiber is wound onto an insulating rod, passed through the center hole of the electrode plate, and wound onto a take-up roll. The receiving roller is placed directly under the electrode plate, driven by the motor to rotate around the central axis through the belt drive, and collects the oriented twisted yarn.

The invention relates to a multi-needle rotary twisting melt electrospinning nano-twist preparation device. The extruder heats and extrudes the material, and the melt enters the flow channel between the splitter plate and the central shaft, and the flow channel is from top to bottom. Gradually narrowing, the melt flows evenly into each single-needle nozzle through the conical deflector, ensuring the uniformity of feeding.

The invention relates to a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. Balls are placed in the matching part of the diverter plate and the thin-walled container, and the sliding friction is changed into rolling friction, which reduces the rotational movement of the thin-walled container. when the friction force.

The invention relates to a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. A worm gear drive drives a spray head to rotate, and the jet oscillates and whips rapidly in the air, so that the fiber is further stretched and thinned.

The present invention is a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. The worm drives the worm wheel to rotate, and at the same time, the single-needle nozzle connected to the bottom of the thin-walled container by thread rotates accordingly, and the needle can be disassembled as needed. Installation, easy to clean. Replacing the single-needle nozzle with a needle plug can reduce the number of fibers and achieve the purpose of controlling the number of fibers.

The present invention is a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. The ring-shaped uniformly distributed single-needle nozzle rotates to realize the gathering effect on fiber bundles, and the twist of nanofibers can be controlled by adjusting the rotational speed of the motor. .

The invention discloses a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. The high-speed rotation of the receiving roller is conducive to the orientation of the gathered fibers during the falling process, and the fibers finally collected on the receiving roller are oriented nano-twisted yarns.

The invention relates to a method for preparing melt electrospun nano-twisted yarn with multi-needle rotary twisting: molten material enters the flow channel between the diverter plate and the central shaft, the flow channel gradually narrows from top to bottom, and the melt passes through the cone. Shaped deflector, uniform flow into each single-needle nozzle. Heating rods are inserted into the manifold for heating. A high-voltage electrostatic field is formed between the single-needle nozzle and the electrode plate, and the worm gear drive drives the uniformly distributed single-needle nozzle to rotate. Under the action of the electric field force, the fiber is stretched and thinned. The fiber bundle is wound onto an insulating rod, passed through the center hole of the electrode plate, and wound onto a take-up roll. The receiving roller is rotated by the motor to receive the fibers. The rotating speed and the falling speed of the fibers are quite conducive to the regular collection of the fibers, and at the same time the fibers are further stretched and refined. By adjusting the motor speed to control the rotation speed of the single-needle sprinkler head uniformly distributed in the ring, with the rotation of the single-needle nozzle head, the fiber between the nozzle head and the receiving roller will be twisted, and the twist angle can be adjusted by controlling the motor speed Controlling the twist of the nanofibers.

By the introduction of above technical scheme, compared with the prior art, the present invention has the following advantages:

1. The transmission device drives the ring-shaped uniformly distributed single-needle nozzle to rotate to realize the twisting of the nanofiber bundle. By controlling the speed of the motor, the twist of the fiber can be controlled, and the mechanical properties of the nanofiber are improved.

2. The receiving roller is located directly below the electrode plate. Its high-speed rotation is conducive to the orientation of the gathered fibers during the falling process. Its rotational speed and the falling speed of the fibers are quite conducive to the regular collection of fibers, which is conducive to the refinement of fiber diameter and the formation of gathered long fibers. .

3. By adjusting the rotation speed of the motor, and then controlling the rotation speed of the uniformly distributed single-needle nozzle, and then controlling the twisting angle of the fiber, nano-twisted yarns with different twists can be obtained.

4. Nano-twisted yarns with different fiber numbers can be obtained by using needle plugs instead of single-needle nozzles, which improves the applicability of nano-twisted yarns.

5. The ring-shaped single-needle nozzle and the bottom surface of the thin-walled container are connected by threads, which is convenient for disassembly, replacement and cleaning of the needle.

Description of drawings

Fig. 1 is a schematic diagram of a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device of the present invention.

Fig. 2 is a bottom-view cross-sectional schematic diagram of the multi-needle arrangement scheme of the structure shown in Fig. 1 .

Fig. 3 is a partial cross-sectional schematic view of the central axis and the conical deflector of the structure shown in Fig. 1 .

FIG. 4 is a schematic cross-sectional view of the needle head of the structure shown in FIG. 1 .

FIG. 5 is a schematic cross-sectional view of the needle plug with the structure shown in FIG. 1 .

In the figure: 1-heating rod; 2-central shaft; 3-runner; 4-corner head; 5-extruder; 6-manifold plate; 7-ball; 8-worm; 9-thin-walled container; 10 -copper ring; 11-conical deflector; 12-single-needle nozzle; 13-worm wheel; 14-acrylic plate with holes; 15-electrode plate; 16-high voltage electrostatic generator; 17-receiving roller.

Specific implementation method

A multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device of the present invention, as shown in Figure 1, mainly includes: a heating rod 1, a central shaft 2, a flow channel 3, a corner head 4, and an extruder 5. Splitter plate 6, ball 7, worm screw 8, thin-walled container 9, copper ring 10, conical deflector 11, single-needle nozzle 12, worm wheel 13, acrylic plate with holes 14, electrode plate 15, high-voltage electrostatic generator 16, receiving roller 17. The outlet at the end of the extruder 5 is connected with the inlet of the corner die 4 . The splitter plate 6 and the central shaft 2 form a flow channel 3, which gradually narrows from top to bottom and connects with the outlet of the corner head 4. A copper ring 10 is arranged between the upper part of the needle 12 and the flow channel 3 as a sealing device. The melt flows into each single-needle nozzle 12 evenly through the flow channel 3 and the conical deflector 11, ensuring the uniformity of feeding. The central shaft 2 and the splitter plate 6 are positioned by the shaft shoulder, and the lower end is connected with the conical deflector 11 by threads. The heating rod 1 is inserted into the splitter plate 6 for heating. The worm gear 13 and the worm screw 8 at the lower end of the thin-walled container 9 form a transmission device (the transmission device can also be selected from belt transmission, chain transmission, gear transmission, etc. to realize multi-needle rotation and twisting, and the worm gear transmission is used as an example here), and the bottom Uniformly distributed single-needle nozzle 12. The ball 7 is placed in the matching part between the diverter plate 6 and the thin-walled container 9, changing sliding friction into rolling friction, and reducing the frictional force when the thin-walled container 9 rotates. The electrode plate 15 is connected with the high-voltage electrostatic generator 16 and fixed on the perforated acrylic plate 14, forming a high-voltage electrostatic field with the single-needle nozzle 12, and the middle hole of the electrode plate 15 is connected with the single-needle nozzle 12 and the cone The center of the device 11 is coaxial. The receiving roller 17 is placed directly below the electrode plate 15 and is connected with the motor through a belt drive for collecting the twisted yarn.

The invention discloses a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. The worm screw 8, the worm wheel 13, the thin-walled container 9 and the single-needle nozzle 12 constitute the main parts of the multi-needle rotary twisting device. The lower part of the side wall of the thin-walled container 9 is thickened to form a transmission device composed of a worm wheel 13 and a worm 8, and a plurality of single-needle nozzles 12 are uniformly arranged in a ring at the bottom, as shown in FIG. 2 . The single-needle nozzle 12 is threadedly connected to the thin-walled container 9, as shown in Figure 4, which facilitates replacement and cleaning of the single-needle nozzle, and can be achieved by replacing the single-needle nozzle by using a needle plug, as shown in Figure 5, to control the number of fibers Purpose.

The invention discloses a multi-needle rotary twisting melt electrospinning nano-twisted yarn preparation device. The central shaft 2 and the splitter plate 6 are positioned by the shaft shoulder, and the lower end is connected with the conical deflector 11 by threads. The runner 3 gradually narrows from top to bottom, as shown in FIG. 3 . The melt flows into each single-needle nozzle evenly through the conical deflector 11, which ensures the uniformity of feeding.

The invention discloses a method for preparing nano-twisted melt electrospun yarns with multi-needle rotation and twisting. The temperature of the barrel is 180°C, and the temperature of the corner of the melt channel in the machine head is 220°C. The temperature of the single-needle nozzle is 240°C. The distance between the single-needle nozzle and the electrode plate is 10cm. After adding polypropylene (PP6820) solid particles into the barrel, adjust the voltage indication of the high-voltage electrostatic generator 14 to 50kV, and form a high-voltage electrostatic field between the single-needle nozzle and the electrode plate. A jet is formed at the needle nozzle and stretched to form microfibers. At the same time, the worm gear drives multiple single-needle nozzles to rotate, so that the fibers can achieve the effect of drafting and bunching. The fiber is wound onto an insulating rod, passed through the center hole of the electrode plate, and wound onto a take-up roll. The receiving roller is connected with a motor through a belt drive for rotational movement, and collects oriented nano-twisted yarns. By controlling the rotation speed of the motor to adjust the rotation speed of the single-needle nozzle, the control of the fiber twist can be realized. At the same time, the rotation of the receiving roller can orient the falling fiber, so that the fiber is twisted more evenly. When the collection speed of the receiving roller is 2500r/min, the degree of parallel orientation of the collected fibers is 0.95, the degree of fiber orientation is very good, and the fiber diameter is 400nm. Adjust the motor speed to change the rotation speed of the single-needle nozzle, so that nano-twist with different twists can be obtained. Wire. When the rotation speed of the disc is 1000r/min, the twist angle of the collected fibers is 35°-40°, which greatly improves the mechanical properties of the fibers.

Claims (4)

1. The preparation facilities 1. a kind of melt electrospun nanofiber of spininess rotation twisting is twisted thread, it is characterised in that: specifically include that heating rod, Central axis, runner, turning head, extruder, flow distribution plate, ball, worm screw, thin-walled pressure vessel, copper ring, conical deflector, single needle spray Head, worm gear, acrylic board with holes, electrode plate, HV generator and receiving roll, extruder are connected with turning head, turning Head lower end protrudes into runner；Conical deflector is used with central axis and is threadedly coupled, and coaxially arranged with thin-walled pressure vessel；Thin-walled holds Device side wall lower ends positions, which thickeies, is made worm gear, forms transmission device with endless screw electric motor, bottom, which is connected through a screw thread, to be circular layout Single needle spray head；Ball is used in the mating part of flow distribution plate and thin-walled pressure vessel, change sliding friction is rolling friction, when smaller rotation Frictional force；Arrange that copper ring occurs as sealing device, annular electro pole plate and high-pressure electrostatic between single needle spray head top and runner Device is connected, and is placed on acrylic board with holes, forms high-voltage electrostatic field with accepted roll；Melt is flowed simultaneously by multiple single needle spray heads Out, under electric field force effect, fiber is fallen on electrode plate, meanwhile, worm and gear drives the rotation of single needle spray head, so that fiber reaches The effect of drawing-off and boundling；Fiber is wound on insulating bar, across the mesoporous of electrode plate, is wound into receiving roll；Accepted roll It is placed in immediately below electrode plate, by V belt translation, is driven by a motor around center axis rotation, is collected into twisting thread for orientation.
2. The preparation facilities 2. a kind of melt electrospun nanofiber of spininess rotation twisting according to claim 1 is twisted thread, feature exist In: ball is placed in the mating part of flow distribution plate and thin-walled pressure vessel.
3. The preparation facilities 3. a kind of melt electrospun nanofiber of spininess rotation twisting according to claim 1 is twisted thread, feature exist In: single needle spray head plug replaces part single needle spray head.
4. The preparation method 4. a kind of melt electrospun nanofiber of spininess rotation twisting is twisted thread, it is characterised in that: fused materials enter shunting Runner between plate and central axis, runner become narrow gradually from top to bottom, and melt uniformly flows into each single needle spray through conical deflector Arrange copper ring as sealing device in head, between single needle spray head top and runner；Heating rod insertion flow distribution plate is heated；Single needle High-voltage electrostatic field is formed between spray head and electrode plate, worm gearing drives circumferential uniformly distributed single needle spray head rotation, Under electric field force effect, fiber is stretched refinement；Fibre bundle is wound on an insulating bar, across the mesoporous of electrode plate, around In receiving roll；Receiving roll is rotated by motor drive, is received to fiber, revolving speed and fiber falling speed phase When, while the further slenderizing of fiber；The rotation speed of the uniformly distributed single needle spray head of annular is controlled by adjusting the revolving speed of motor Degree, with the rotation of single needle spray head, the fiber between spray head and receiving roll will do it twisting, and twisting angle can pass through control The revolving speed of motor controls the twist of nanofiber.