Electrostatic spinning device for preparing nanofibers

Abstract

The utility model discloses an electrostatic spinning device for preparing nanofibers. The electrostatic spinning device comprises a motor; the spinning nozzle is connected with a power supply so as to generate an electric field which is uniformly distributed on the surface, the spinning nozzle is used for spraying a spinning solution so as to form nanofibers, and the spinning nozzle is connected to the motor so as to be driven by the motor to rotate; the curved tops of the two curved-top cylinders are oppositely arranged, and the two curved-top cylinders are used for generating a magnetic field; the spherical magnet receiving device is arranged between the two curved-top cylinders, suspends and rotates under the action of a magnetic field, and is used for receiving nanofibers; the electromagnets are arranged on the two opposite sides of the spherical magnet receiving device, and the magnetic field directions of the electromagnets are opposite; a magnetic field formed by the electromagnet acts on the nanofibers to enable the nanofibers to be in a certain orientation, and the spherical magnet receiving device can change the orientation of the nanofibers through rotation. According to the utility model, the spinning fibers can be highly oriented under the action of magnetic field force.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrospinning technical field relates to a kind of electrospinning device for preparing nanofiber. BACKGROUND

[0002] Electrospinning technology is a process of stretching and refining polymer solution or melt by high-voltage electrostatic field. Under the action of electric field, polymer solution or melt at the spinneret forms droplets, and as the electric field force increases, the droplets change from spherical to conical (Taylor cone). When the surface charge repulsion of the droplets exceeds the surface tension, a fiber filament is obtained from the tip of the conical. The jet is stretched and refined under the action of electric field force, and the solvent is volatilized, finally forming a fiber on the receiving device.

[0003] Traditional electrospinning device adopts single needle, and the production efficiency is very low, which only meets the needs of laboratory research. The single needle electrospinning device greatly limits the large-scale production and preparation of nanofiber.

[0004] Multi-jet electrospinning technology improves production efficiency by increasing the number of spinnerets. Compared with traditional single-jet equipment, it can meet the demand of batch production. However, increasing the number of needles requires increasing the input voltage, which may cause electric field interference and affect the fiber morphology and fineness. In addition, multi-needle equipment may also face problems such as needle blockage and maintenance difficulty, increasing production cost and reducing operation efficiency.

[0005] In the existing patent CN215163336U, the fiber orientation is improved by magnetic field, but the traditional single needle spinning is used, which faces the problems of needle blockage and low production efficiency.

[0006] In the existing patent CN203625536U, nanofiber is prepared by electromagnetic field coupling method. The charged polymer fiber solution is subjected to the action of a large enough magnetic field, so that the orientation of the collected nanofiber is greatly improved. At the same time, the jet is stabilized, and the order degree of nanofiber is further improved. However, this device can only spin fibers with one direction of orientation, and the operation is not flexible enough. UTILITY MODEL CONTENTS

[0007] The utility model aims at overcoming the above technical background and the deficiencies in the prior art, and provides an electrospinning device for preparing nanofiber, which can solve the problems of needle blockage, poor fiber orientation, fiber tangled in disorder and difficulty in changing spinning direction in the prior art.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An electrospinning device for preparing nanofiber, comprising:

[0010] Motor;

[0011] A spinneret connected to a power source to generate a uniform distribution of electric field on the surface, the spinneret used to eject a spinning solution to form nanofibers, the spinneret connected to the motor to be driven to rotate by the motor;

[0012] Two curved top columns, the curved tops of the two curved top columns being oppositely arranged, the two curved top columns being used to generate a magnetic field;

[0013] A spherical magnet receiving device arranged between the two curved top columns, suspended and rotated under the action of the magnetic field, the spherical magnet receiving device being used to receive nanofibers;

[0014] A pair of electromagnets with opposite magnetic field directions arranged on opposite sides of the spherical magnet receiving device;

[0015] The magnetic field formed by the electromagnets acts on the nanofibers to make them have a certain orientation, and the spherical magnet receiving device can change the orientation of the nanofibers by rotating.

[0016] Further, the two curved top columns are 25 cm apart, the geometric center of the spherical magnet receiving device and the curved top column are located on the same vertical line, the curved top of the curved top column is a curved surface, and the curvature radius of the curved surface is equal to the radius of the spherical receiving device.

[0017] Further, the pair of electromagnets are the same height as the spherical magnet receiving device and are symmetrical about the spherical magnet receiving device, and the line connecting each electromagnet and the spherical magnet receiving device forms a 45° angle with the line connecting the spinneret and the spherical magnet receiving device.

[0018] Further, the distance between the spinneret and the spherical magnet receiving device is 25-35 cm.

[0019] Further, an alternating current servo motor is arranged in the curved top column, the end face flange diameter of the motor is 80 mm, the shaft diameter is 14 mm, and the motor length is 130 mm; the stator generates a rotating magnetic field after being connected to alternating current with a phase difference of 120°, the number of turns is 120 turns, the rotor is iron, the magnetic poles are arranged alternately according to N-S, and rotates synchronously with the stator magnetic field.

[0020] Further, 1 / 2 of the spinneret ball structure is immersed in the polymer solution, and the spinneret ball radius is 2 cm.

[0021] Further, the motor is a hollow shaft brushless DC motor and is connected to the spinneret through a ceramic insulating sleeve.

[0022] Further, the spinneret is a rotary needle-free electrospinning spherical spinneret, the rotation speed of the spinneret ball structure is 2000 rpm, the voltage is 18 kV, the spinneret is connected to the hollow shaft brushless DC motor, the speed is easy to adjust, and the spinning solution propelling speed is 10 ml / h.

[0023] Further, the spinning solution has a conductivity of 10-3~10-1 S / m and a viscosity of 100~1000 mPa·s, and contains magnetic nanoparticles Ni with a concentration less than 5wt% and uniformly dispersed in the spinning solution.

[0024] Beneficial effects: Compared with the prior art, the beneficial effects achieved by the utility model are:

[0025] The rotating needleless electrospinning head can effectively avoid needle blockage, the suspension type spherical receiving device can make the direction change of the receiving device more flexible, the electromagnet can make the size and direction of the magnetic field more easily controlled, and various experimental requirements can be met at the same time, the electromagnet is symmetrically placed relative to the receiving device, the fiber orientation can be effectively improved, the curvature radius of the curved top column is equal to the spherical receiving device, and the receiving device can be more conveniently placed when the machine is not used.

[0026] The magnetic nanoparticles in the spinning solution can enhance the regulation and control ability of the magnetic field on the fiber orientation, and the servo motor generates a magnetic field to offset the gravity of the spherical receiving device and make the sphere rotate at high speed. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a spinning module structure schematic diagram of the electrospinning device for preparing nanofibers provided by the embodiment one of the application;

[0028] Fig. 2 is a schematic diagram of the servo motor in the curved top column;

[0029] Fig. 3 is a comparison schematic diagram of spinning results under the conditions of increasing magnetic field strength and increasing motor speed;

[0030] 1, high-voltage power supply; 2, spinning head; 3, hollow shaft brushless DC motor; 4, electromagnet one; 5, electromagnet two; 6, spherical magnet receiving device; 7, curved top column; 8, servo motor one (hollow shaft brushless DC motor); 9, servo motor two. DETAILED DESCRIPTION

[0031] The embodiments of the technical solutions will be further described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the utility model, and cannot be used to limit the protection scope of the utility model.

[0032] As shown in Figs. 1-3 , the embodiment of the application provides an electrospinning device for preparing nanofibers, characterized by comprising:

[0033] Motor;

[0034] A spinneret connected to a power source to generate a uniform distribution of electric field on the surface, the spinneret being used to eject a spinning solution to form nanofibers, the spinneret being connected to the motor to be driven to rotate by the motor;

[0035] Two curved top columns, the curved tops of the two curved top columns being oppositely arranged, the two curved top columns being used to generate a magnetic field;

[0036] A spherical magnet receiving device arranged between the two curved top columns, the spherical magnet receiving device being suspended and rotated under the action of the magnetic field, the spherical magnet receiving device being used to receive nanofibers;

[0037] A pair of electromagnets with opposite magnetic field directions, arranged on opposite sides of the spherical magnet receiving device;

[0038] The magnetic field formed by the electromagnets acts on the nanofibers to make them have a certain orientation, and the spherical magnet receiving device can change the orientation of the nanofibers by rotating.

[0039] Further, the two curved top columns are 25 cm apart, the center of the spherical magnet receiving device and the geometric center of the curved top column are located on the same vertical line, the curved top of the curved top column is a curved surface, and the curvature radius of the curved surface is equal to the radius of the spherical receiving device.

[0040] Further, the pair of electromagnets are the same height as the spherical magnet receiving device and are symmetrical about the spherical magnet receiving device, and the line connecting each electromagnet and the spherical magnet receiving device forms a 45° angle with the line connecting the spinneret and the spherical magnet receiving device.

[0041] Further, the distance between the spinneret and the spherical magnet receiving device is 25-35 cm.

[0042] Further, the curved top column is provided with an alternating current servo motor, the end face flange diameter of which is 80 mm, the shaft diameter is 14 mm, and the motor length is 130 mm; the stator generates a rotating magnetic field after being connected to alternating current with a phase difference of 120°, the number of turns is 120 turns, the rotor is iron, the magnetic poles are arranged alternately according to N-S, and rotates synchronously with the stator magnetic field.

[0043] Further, 1 / 2 of the spinneret ball structure is immersed in the polymer solution, and the spinneret ball radius is 2 cm.

[0044] Further, the motor is a hollow shaft brushless direct current motor connected to the spinneret through a ceramic insulating sleeve.

[0045] Further, the spinneret is a rotary needle-free electrospinning spherical spinneret, the rotation speed of the spinneret ball structure is 2000 rpm, the voltage is 18 kV, the spinneret is connected to the hollow shaft brushless direct current motor, the speed is easy to adjust, and the spinning solution propelling speed is 10 ml / h.

[0046] Further, the spinning solution has an electric conductivity of 10-3~10-1S / m and a viscosity of 100~1000mPa·s, and contains magnetic nanoparticles Ni with a concentration of less than 5wt% and uniformly dispersed in the spinning solution.

[0047] The following is a few specific examples, the parameters of the structure of the application are adjusted to compare the effect. Example 1

[0048] An electrospinning device for preparing nanofibers, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a curved column 7, a servo motor 8, and a servo motor 9; the high-voltage power supply 1 is connected to the rotating needleless electrospinning spinneret through the brush-ring collector, the electromagnet and the electromagnet are fixed in the electrospinning device box, and the straight line connected with the receiving device is at an angle of 45° with the vertical direction and the horizontal direction, the two electromagnets are symmetrical about the receiving device and located on the same horizontal line;

[0049] The curved column is fixed in the electrospinning device box, and the horizontal distance between the curved column and the spinneret is 25cm, the distance between the two curved columns is 25cm, and the diameter of the spherical magnet receiving device is 15cm, and the sphere is placed on the lower curved column when not powered;

[0050] The center of the spinneret ball and the center of the spherical receiving device after being powered are located on the same horizontal line, and the servo motor is installed inside the curved column and connected to the power supply.

[0051] The spherical magnet receiving device is a permanent magnet, and the rotor material of the servo motor is iron.

[0052] The working process of this embodiment: connect the high-voltage power supply 1 to the rotating needleless electrospinning spinneret through the brush-ring collector, connect the hollow shaft brushless DC motor 3 to the spinneret through the ceramic insulation sleeve, set the power supply to 18kV, set the rotating needleless electrospinning spinneret flow to 10ml / h, set the hollow shaft brushless DC motor speed to 3343rpm, and adjust the horizontal distance between the spinneret and the curved column to 25cm. Connect the servo motor to the power supply, adjust the magnetic field strength, so that the spherical magnet receiving device is suspended in the middle of a pair of curved columns in the magnetic field, and the rotation speed reaches 350r / min. Power the horizontal pair of electromagnets with a voltage of 12V to generate a horizontal magnetic field to highly orient the spinning fibers. Example 2

[0053] An electrospinning device for preparing nanofibers, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a column 7, a servo motor 8, a servo motor 9, the power supply is set to 18kV, the magnetic field is increased by adjusting the upper servo motor, and the rotating speed of the spherical magnet receiving device reaches 400r / min, and the remaining operation mode is the same as that of example 1. Example three

[0054] An electrospinning device for preparing nanofibers, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a column 7, a servo motor 8, a servo motor 9, the power supply is set to 18kV, the rotating speed of the spherical magnet is 400r / min, the rotating speed of the hollow shaft brushless DC motor is set to 4775rpm, the direction of the spherical magnet receiving device is adjusted to be 30° deviated from the direction of example 1, and the remaining operation mode is the same as that of example 1. Example four

[0055] An electrospinning device for preparing nanofibers, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a column 7, a servo motor 8, a servo motor 9, the horizontal distance between the spinneret and the curved top column is adjusted to be 30cm, the rotating speed of the hollow shaft brushless DC motor is set to 4775rpm, the direction of the spherical magnet receiving device is adjusted to be 60° deviated from the direction of example 1, the voltage of a pair of electromagnets is increased to 24V, and the remaining operation mode is the same as that of example 1. Example five

[0056] An electrospinning device for preparing nanofibers, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a column 7, a servo motor 8, a servo motor 9, the horizontal distance between the spinneret and the curved top column is adjusted to be 30cm, the rotating speed of the hollow shaft brushless DC motor is set to 7163rpm, the direction of the spherical magnet receiving device is adjusted to be 90° deviated from the direction of example 1, the voltage of a pair of electromagnets is increased to 36V, and the remaining operation mode is the same as that of example 1. Example six

[0057] An electrostatic spinning device for preparing nanofiber, comprising a high-voltage power supply 1, a spinneret 2, a hollow shaft brushless DC motor 3, an electromagnet 4, an electromagnet 5, a spherical magnet receiving device 6, a column 7, a servo motor 8, a servo motor 9, the horizontal distance between the spinneret and the curved top column is adjusted to 35cm, the rotation speed of the hollow shaft brushless DC motor is set to 7163rpm, the direction of the spherical magnet receiver is adjusted so that the direction of the spherical magnet receiver is deviated from that of example one by 90°, the voltage of a pair of electromagnets is increased to 48V, and the remaining operation mode is the same as that of example one.

[0058] Please refer to Table 1, the above-mentioned example one is spun into a fiber with better orientation, the orientation degree is about 45%, the fiber diameter is about 450nm, the fiber in example two is thinned to about 394nm after the rotation speed of the receiving device is increased, the final spun fiber in example three is at an average angle of about 30° with that in example one, and is thinned to about 276nm after the rotation speed of the spinneret is increased, the fiber orientation degree in example four is increased compared with that in example three, about 55%, the fiber is thinned to about 266nm, the average angle with the fiber in example one is about 60°, the fiber orientation degree in example five is higher than that in example four, about 72%, the fineness is changed to 177nm, the average angle with the fiber in example one is about 90°, the fiber orientation degree in example six is higher than that in example five, which can reach 95%, the fiber fineness is less than that in example five, about 162nm. The fibers spun in examples one, two, three, four and five are highly oriented and cross each other, which can form a bird nest-like structure, the operation is flexible and simple, and raw materials are saved.

[0059] Table 1: Fiber data of examples one to six

[0060]

[0061] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should also be considered as the protection scope of the present application.

Claims

1. An electrospinning apparatus for preparing nanofibers, characterized in that, include: Electric motor; A spinneret is connected to a power source to generate a uniformly distributed electric field on a surface. The spinneret is used to eject spinning solution to form nanofibers. The spinneret is connected to the motor and is driven to rotate by the motor. Two curved-top cylinders are arranged with their curved tops facing each other, and the two curved-top cylinders are used to generate a magnetic field; A spherical magnet receiving device is disposed between two curved-top cylinders and suspends and rotates under the action of a magnetic field. The spherical magnet receiving device is used to receive nanofibers. A pair of electromagnets with opposite magnetic field directions are disposed on opposite sides of the spherical magnet receiving device; The magnetic field generated by the electromagnet acts on the nanofiber, causing it to be oriented in a certain way, and the spherical magnet receiving device can change the orientation of the nanofiber by rotating it.

2. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, The two curved-top cylinders are 25cm apart. The center of the sphere of the spherical magnet receiving device and the geometric center of the curved-top cylinder are located on the same vertical line. The curved top of the cylinder is an arc surface, and the radius of curvature of the arc surface is equal to the radius of the spherical receiving device.

3. The electrospinning apparatus for preparing nanofibers according to claim 2, characterized in that, The pair of electromagnets are at the same height as the spherical magnet receiving device and are symmetrical about the spherical magnet receiving device. The line connecting each electromagnet to the spherical magnet receiving device forms a 45° angle with respect to the line connecting the spinneret and the spherical magnet receiving device.

4. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, The distance between the spinneret and the spherical magnet receiving device is 25~35cm.

5. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, The curved top column is equipped with an AC servo motor with an end flange diameter of 80mm, a shaft diameter of 14mm, and a motor length of 130mm. When an AC current with a phase difference of 120° is applied to the stator, a rotating magnetic field is generated with 120 turns. The rotor is made of iron, and the magnetic poles are arranged alternately in N-S order, rotating synchronously with the stator magnetic field.

6. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, Half of the spinneret's spherical structure is immersed in the polymer solution, and the spinneret's radius is 2 cm.

7. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, The motor is a hollow shaft brushless DC motor connected to the spinneret via a ceramic insulating sleeve.

8. The electrospinning apparatus for preparing nanofibers according to claim 7, characterized in that, The spinneret is a rotary needleless electrostatic spinning ball spinneret with a spherical structure rotating at 2000 rpm and a voltage of 18 kV. The spinneret is connected to a hollow shaft brushless DC motor for easy speed adjustment, and the spinning solution propulsion speed is 10 ml / h.

9. The electrospinning apparatus for preparing nanofibers according to claim 1, characterized in that, The conductivity of the spinning solution is 10. -3 ~10 -1 The viscosity is 100~1000 mPa·s, and the spinning solution contains magnetic nanoparticles Ni with a particle concentration of less than 5 wt%, which are uniformly dispersed in the spinning solution.

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