阅读说明：本技术 一种新型静电纺集束加捻纳米纱线装置 (Novel electrostatic spinning cluster twisting nano yarn device ) 是由 尚育魁 周建平 李志磊 许燕 朱光艺 于 2021-10-29 设计创作，主要内容包括：本发明公开一种新型静电纺集束加捻纳米纱线装置,主要包括喷射装置、金属环电极、两级旋风气流加捻装置、收集装置、高压发生装置。喷射装置分为射流装置、喷气装置,分别通过输液管、输气管与溶液池、高压储气池连接,两级旋风气流加捻装置通过气流连通装置、储气环与风机连接,在两级旋风气流加捻装置下部放置收集装置、其动力有电机提供,高压发生装置正负极分别与喷射装置、金属环电极相连接。本发明操作简单,效率高,可连续制备捻度较高、条干均匀度较好的纳米纤维纱线。(The invention discloses a novel electrostatic spinning cluster twisting nano yarn device which mainly comprises a spraying device, a metal ring electrode, a two-stage cyclone airflow twisting device, a collecting device and a high-pressure generating device. The spraying device is divided into a jet device and an air injection device which are respectively connected with the solution tank and the high-pressure air storage tank through a liquid conveying pipe and an air conveying pipe, the two-stage cyclone airflow twisting device is connected with the fan through an airflow communication device and an air storage ring, a collecting device is arranged at the lower part of the two-stage cyclone airflow twisting device, power of the collecting device is provided by a motor, and the positive electrode and the negative electrode of the high-pressure generating device are respectively connected with the spraying device and a metal ring electrode. The method is simple to operate and high in efficiency, and can be used for continuously preparing the nanofiber yarns with higher twist and better evenness.)

1. A novel electrostatic spinning cluster twisting nanometer yarn device is characterized in that: the device mainly comprises a spraying device (9), a metal ring electrode (2), a two-stage cyclone airflow twisting device (5), a collecting device (7) and a high-pressure generating device (1), wherein the spraying device (9) is divided into a jet device (15) and an air injection device (14) which are respectively connected with a solution tank (12) and a high-pressure air storage tank (10) through an infusion tube (13) and an air conveying tube (11); the two-stage cyclone airflow twisting device (5) is connected with a fan (8) through an airflow communication device (3) and an air storage ring (4), a collecting device (7) is arranged at the lower part of the two-stage cyclone airflow twisting device (5), and power of the collecting device is provided by a motor (6); the anode and the cathode of the high-voltage generating device (1) are respectively connected with the jetting device (9) and the metal ring electrode (2).

2. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: the jet device (9) is made of metal, the lower surface of the jet device (15) is provided with a plurality of jet holes (17) which are arranged in order, the diameter is 0.05mm-8mm, and a needleless electrospinning generator (16) is arranged in the jet device; the left side and the right side of the jet device (15) are provided with air injection devices (14), a plurality of air passages (18) are arranged in order, the inclination angle of an air outlet (19) of each air passage is 40-80 degrees, and electrostatic spinning bundling is assisted.

3. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: the length of the metal ring electrode (2) is 1cm-60cm away from the bottom surface of the injection device (9), and the diameter of the metal ring electrode is 5cm-40 cm.

4. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: each level of twisting cavity of the two-stage cyclone airflow twisting device (5) is provided with a single fan (8) for providing high-speed airflow, the diameter (20) of the first level of twisting cavity is larger than the diameter (21) of the second level of twisting cavity, a power system (22) is arranged in the two-stage cyclone airflow device (5) and can drive the two-level cyclone airflow device to rotate around the center line of the two-level cyclone airflow device, and the rotating speed is 400r/min-1000 r/min.

5. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: the airflow communication devices (3) are arranged centrosymmetrically by taking the central line of the two-stage cyclone airflow twisting device (5) as a reference, the inner wall (3) of the airflow communication device is cut on the wall of the cyclone twisting cavity at the joint of the two-stage cyclone airflow twisting device (5), and the airflow communication devices are communicated with high-speed airflow.

6. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: the distance between the collecting device (7) and the bottom surface of the two-stage cyclone airflow twisting device (5) is 5cm-40cm, and the rotating speed is 600r/min-1200 r/min.

7. The electrostatic spinning cluster twisting nano-yarn device according to claim 1, characterized in that: all the devices except the spraying device (9) and the metal ring electrode (2) are coated with an insulating material.

Technical Field

The invention belongs to the field of electrostatic spinning, and particularly relates to an airflow-assisted electrostatic spinning cluster twisting nanometer yarn device.

Background

Compared with other methods for manufacturing nano fibers such as a spinning method, a template synthesis method, a self-assembly method and the like, the electrostatic spinning manufactured fibers have the advantages of small fiber diameter, large density, large specific surface area, easiness in functionalization and the like, but the fibers collected in the conventional electrostatic spinning mode are irregularly arranged nano fiber non-woven felts which have the defects of poor mechanical property, low yield and the like, so that directionally arranged nano fiber bundles and twisted yarns thereof have wider market prospects.

The current methods for preparing the directionally aligned nanofiber bundles are as follows: (1) the high-speed rotation collection method utilizes the tensile force generated by high-speed rotation to align the nano fibers, and has the defect that the centrifugal force of rotation influences the deposition of fiber bundles; (2) the sharp edge collection method utilizes the sharp point discharge principle to enable the tensile force generated by the rotating disc to stretch jet flow to form a nanofiber bundle, and has the defect that the oriented nanofiber bundle with a larger area cannot be obtained; (3) the water bath collection method is characterized in that the drawing force of water flow is utilized to draw and draw the nano fibers, fiber bundles are formed at the bottom of a water vortex, and the defect is that the fibers are bonded; (4) the conjugate double-head method utilizes charges with opposite charge ejected by two nozzles with opposite polarities to attract each other to form a nanofiber bundle, and has the defect that the obtained nanofiber bundle is thinner; (5) in the auxiliary electrode collection method, an auxiliary electrode is placed in an electrostatic field to influence electric field distribution to obtain a nanofiber bundle, and the defects are that the obtained nanofiber bundle is not high in orientation arrangement degree, the twisting mode after the nanofiber is directionally collected is usually mechanical twisting, but mechanical friction can cause fiber damage, so in recent years, airflow twisting devices are reported to appear in succession, CN111118678B rotates at the neck of the device to generate air vortex to twist the nanofiber bundle to form nanofiber yarns, and CN102703998A twists the nanofiber bundle through an airflow nozzle to form nanofiber yarns, but the method is not high in twisting degree and low in efficiency.

Disclosure of Invention

The invention aims to provide an electrostatic spinning cluster twisting nanometer yarn device which is simple to operate and high in efficiency, utilizes auxiliary airflow and a metal ring electrode to prepare a nanometer fiber bundle with higher orientation degree, and utilizes a two-stage cyclone airflow twisting device to prepare nanometer fiber yarns with higher twist degree and better evenness.

In order to achieve the purpose, the invention adopts the technical scheme that: a novel electrostatic spinning cluster twisting nanometer yarn device mainly comprises a spraying device, a metal ring electrode, a two-stage cyclone airflow twisting device, a collecting device and a high-pressure generating device. The injection device is divided into a jet device and an air injection device which are respectively connected with the solution tank and the high-pressure air storage tank through a liquid conveying pipe and a gas conveying pipe; the two-stage cyclone airflow twisting device is connected with the fan through an airflow communication device and an air storage ring, a collecting device is arranged at the lower part of the two-stage cyclone airflow twisting device, and power of the collecting device is provided by a motor; the anode and the cathode of the high-voltage generating device are respectively connected with the jetting device and the metal ring electrode.

Furthermore, the jet device is made of metal, a plurality of jet holes which are regularly arranged are arranged on the lower surface of the jet device, the diameter of the jet holes is 0.05mm-8mm, and a needleless electrospinning generator is arranged in the jet device; the left side and the right side of the jet device are provided with air injection devices, a plurality of air passages are arranged in order, the inclination angle of air injection ports of the air passages is 40-80 degrees, and electrostatic spinning bundling is assisted.

Furthermore, a metal ring electrode is arranged 1cm-60cm away from the bottom of the spraying device, and the diameter of the metal ring electrode is 5cm-40 cm.

Furthermore, each level of twisting cavity of the two-stage cyclone airflow twisting device is provided with a single fan for providing high-speed airflow, the diameter of the first-level twisting cavity is larger than that of the second-level twisting cavity, a power system is arranged in the two-level cyclone airflow device and can drive the two-level cyclone airflow device to rotate around the center line of the two-level cyclone airflow device, and the rotating speed is 400r/min-1000 r/min.

Furthermore, the air flow communication device is arranged in a centrosymmetric manner by taking the central line of the two-stage cyclone air flow twisting device as a reference, the inner wall of the air flow communication device is cut on the wall of the twisting cavity at the joint of the two-stage cyclone air flow twisting device, and the air flow communication device is communicated with high-speed air flow.

Furthermore, the distance between the collecting device and the two-stage cyclone airflow twister is 5cm-40cm, and the rotating speed is 600r/min-1200 r/min.

Further, all the devices except the ejection device and the metal ring electrode are coated with an insulating material.

Compared with the prior art, the invention has the following beneficial effects.

1. The adoption of the needle-free electrospinning generator can ensure the output of a large amount of continuous jet flow, and the cluster is carried out on the jet flow by utilizing the coupling of a flow field generated by introducing the air injection device and the metal ring electrode and an electric field; on the other hand, the placement of the metal ring electrode can influence the electric field distribution, so that the electric field force is changed to control the jet flow movement, and the directionally-gathered fiber bundle is obtained. In conclusion, the fiber bundle orientation alignment degree obtained by the combined action of the air injection device and the metal ring electrode is higher.

2. A two-stage cyclone airflow twisting device is introduced to carry out twisting process on the fiber bundle, high-speed airflow tangentially enters a first-stage twisting cavity through the inner walls of two communicating devices, the diameter of the twisting cavity is large at the top and small at the bottom, so that the high-speed airflow forms rotating airflow in the twisting cavity, primary twisting is carried out on the nanofiber bundle under the action of an airflow field, after the primary twisting, yarns enter a second-stage twisting cavity through an intermediate channel, secondary twisting is carried out on the fiber bundle on the same principle as the first-stage twisting cavity, and meanwhile, centripetal force generated by the rotating motion of the two-stage cyclone airflow twisting device also has gathering and twisting effects on the nanofiber bundle. In summary, the nanofiber yarn with high twist and good yarn evenness can be prepared by introducing the two-stage cyclone airflow twisting device.

Drawings

FIG. 1 is a drawing of an electrostatic spinning cluster twisting nano yarn device.

Fig. 2 is a schematic structural view of the spraying device.

Figure 3 is a front sectional schematic view of a two stage cyclone twisting device.

In the figure: 1-a high voltage generator; 2-metal ring electrodes; 3-a communication device; 4-gas storage ring; 5-a two-stage cyclone twisting device; 6, a motor; 7-a collecting device; 8-a fan; 9-a spraying device; 10-high pressure gas storage tank; 11-gas pipe; 12-a solution pool; 13-a transfusion tube; 14-a gas injection device; 15-a fluidic device; 16-a needle-free electrospinning generator; 17-jet hole; 18-air chamber; 19-an air jet; 20-a first-stage twisting cavity; 21-a secondary twisting cavity; 22-power plant.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. 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.

Referring to the attached drawings 1, 2 and 3, a novel electrostatic spinning cluster twisting nano yarn device is characterized in that: the device mainly comprises a spraying device (9), a metal ring electrode (2), a two-stage cyclone airflow twisting device (5), a collecting device (7) and a high-voltage generating device (1).

Wherein the injection device (9) is divided into a jet device (15) and an air injection device (14) which are respectively connected with the solution tank (12) and the high-pressure air storage tank (10) through an infusion tube (13) and an air delivery tube (11); the two-stage cyclone airflow twisting device (5) is connected with a fan (8) through an airflow communication device (3) and an air storage ring (4), the lower part of the two-stage cyclone airflow twisting device (5) is provided with a collecting device (7), and the power of the collecting device is provided by a motor (6); the anode and the cathode of the high-voltage generating device (1) are respectively connected with the jetting device (9) and the metal ring electrode (2).

Wherein, the jet device (9) is made of metal, 55 jet holes (17) which are arranged in order are arranged on the lower surface of the jet device (15), the diameter is 2mm, and a needleless electrospinning generator (16) is arranged in the jet device; the left side and the right side of the jet device (15) are provided with air injection devices (14), the inside of the jet device is provided with 50 air passages (18) which are arranged in order, the inclination angle of an air injection port (19) of each air passage is 60 degrees, and electrostatic spinning clustering is assisted.

Wherein, a metal ring electrode is arranged 20cm away from the bottom surface of the spraying device (9), and the diameter of the metal ring electrode is 15 cm.

Each level of twisting cavity of the two-stage cyclone airflow twisting device (5) is provided with a single fan (8) for providing high-speed airflow, the diameter (20) of the first level of twisting cavity is larger than the diameter (21) of the second level of twisting cavity, and a power system (22) is arranged in the two-stage cyclone airflow device (5) and can drive the two-stage cyclone airflow device to rotate.

The airflow communication device (3) is arranged in a centrosymmetric mode by taking the central line of the two-stage cyclone airflow twisting device (5) as a reference center, the inner wall of the airflow communication device (3) is cut on the wall of the twisting cavity at the connecting position of the airflow communication device and the two-stage cyclone airflow twisting device (5), and the airflow communication device is communicated with high-speed airflow.

Wherein, the distance between the collecting device (7) and the two-stage cyclone airflow twister (5) is 10 cm.

The following explains the process of manufacturing the electrostatic spinning nanofiber yarn by the electrostatic spinning cluster twisting nanometer yarn device by using Polyacrylonitrile (PAN).

(1) Adding Polyacrylonitrile (PAN) into dimethyl formamide (DMF) solute, processing the solution into electrostatic spinning solution, adding the electrostatic spinning solution into a solution tank (12), opening an outlet of the solution tank, and injecting the solution into a jet device (15).

(2) Sufficient 0.2Mpa gas is introduced into the high-pressure gas storage pool (10), and the outlet of the high-pressure gas storage pool is opened to inject the gas into the gas injection device (14).

(3) And (3) turning on the high-voltage generating device (1), setting the positive electrode to be 25kv and the negative electrode to be-5 kv, and forming an electrostatic spinning electric field.

(4) The needle-free electrospinning generator (16) of the fluidic device is turned on and the formation of the jet begins.

(5) Opening an air hole (19) of the injection device; and (3) forming an airflow field, and drafting, thinning, directionally gathering and bundling the nano fibers under the coupling of the airflow field and the electric field.

(6) Setting the pressure of a fan (8) communicated with the primary twisting cavity (20) and the secondary twisting cavity (21) as 0.1 Mpa and 0.4 Mpa respectively; the two-stage cyclone airflow twister (5) is arranged at the rotating speed of 600 r/m. The high-speed airflow starts to enter the twisting cavity to form rotary airflow and the rotary motion generated by the two-stage cyclone airflow twister (5) is used for twisting the fiber bundle.

(7) The rotational speed of the collecting device (7) is set to be 800r/m, and the nanofiber yarn is collected.