CN110735192B - Electrode-assisted disc type porous electrostatic spinning spray head assembly - Google Patents
Electrode-assisted disc type porous electrostatic spinning spray head assembly Download PDFInfo
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- CN110735192B CN110735192B CN201911055469.4A CN201911055469A CN110735192B CN 110735192 B CN110735192 B CN 110735192B CN 201911055469 A CN201911055469 A CN 201911055469A CN 110735192 B CN110735192 B CN 110735192B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
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Abstract
The invention relates to an electrode auxiliary disc type porous electrostatic spinning nozzle assembly, which comprises a disc type porous spinning nozzle, wherein the disc type porous spinning nozzle mainly comprises a disc type spinning disc, a columnar flow channel and a raised auxiliary electrode; the dish-shaped wire spraying disc mainly comprises a coaxial hollow round table and a hollow cylinder, and the protruding auxiliary electrode mainly comprises a cylindrical electrode and a plurality of conical electrodes; the cylindrical electrode and the cylindrical electrode are coaxial, the orthographic projections of all the conical electrodes are positioned in the orthographic projections of the cylindrical electrode, a plurality of through holes are arranged on the disc-shaped wire spraying disc, the shapes and the sizes of all the through holes are the same, the shapes and the sizes of all the conical electrodes are the same, the number of the through holes is equal to the number of the conical electrodes, the included angles between the extending directions of all the through holes and the central axis of the cylinder are all theta 1, the included angles between the central axes of all the conical electrodes and the central axis of the cylinder are all theta 2, and the theta 1 is. The auxiliary electrode on the electrostatic spinning device can be simultaneously suitable for electric field enhancement of a plurality of jet flows, and is more beneficial to refining of nano fibers.
Description
Technical Field
The invention belongs to the technical field of electrostatic spinning devices, and relates to an electrode-assisted disc type porous electrostatic spinning nozzle assembly.
Background
The electrostatic spinning method has become one of the main approaches for preparing nano-fibers due to the characteristics of controllable process, simple equipment, wide spinning range, low cost and the like, and the principle is that a polymer solution or a melt is electrified and deformed in a high-voltage electrostatic field to form a suspended conical liquid drop at the tail end of a spray head; when the charge repulsion force of the surface of the liquid drop exceeds the surface tension force, polymer micro jet flows can be ejected at high speed on the surface of the liquid drop, and the jet flows are stretched at high speed by the electric field force within a short distance, volatilized and solidified by a solvent and finally deposited on a receiving substrate to form polymer fibers. The electrostatic spinning technology is divided into a needle type electrostatic spinning technology and a needle-free type electrostatic spinning technology, the needle type electrostatic spinning nanometer fiber is low in yield, and the industrialization requirement is difficult to meet; although the needle-free type has the characteristics of high production speed and high yield, in the spinning process, the spinning solution is in large-area contact with air, the solution is easy to deteriorate, and the jet flow is weak under the action of electric field force, so that the diameter of the formed nano fiber is thicker.
Patent CN201910289923.6 discloses a melt electrostatic spinning method based on equidirectional reinforced composite electric field and its product, wherein one or more auxiliary electrodes with the same direction as the original voltage are added between the melt electrostatic spinning nozzle and the receiving device, thereby enhancing the electric field strength in the area near the nozzle, the auxiliary electrodes of the device are circular ring, hollow cylinder or central perforated original plate, the electric field is concentrated in the center of the circular ring, hollow cylinder or central perforated original plate, the electric field strength around is small, and the device is suitable for electric field enhancement of single jet, but is not suitable for being applied to a single nozzle forming multiple jets around the circumference.
Patent CN201910197538.9 discloses a combined auxiliary electrode for an inner conical surface electrostatic spinning nozzle, and patent US2016/0068999a1 discloses a Melt Differential Electrospinning Device and Process, which are all coaxially and vertically arranged above a nozzle through a plurality of layers of metal ring electrodes, so as to increase an electric field, wherein the electric field is concentrated at the center of a circular ring, and the electric field is suitable for electric field enhancement of single jet flow and is also not suitable for being applied to a single nozzle which forms a plurality of jet flows around the circumference.
Patent KR 2015005024620150409 discloses that Electro-spinning apparatus using electric field and method of manufacturing a transferred electrode using the same, which enhances the electric field strength by adding a metal ring electrode between the showerhead and the receiving substrate, the electric field of which is concentrated at the center of the ring, and is also only suitable for the electric field enhancement of a single jet.
The literature (Electric field analysis of spinning design for multiholeelectric systems [ J ]. Journal of Materials Science,2014,49(5): 1964-.
Therefore, it is very necessary to add an auxiliary electrode for electric field enhancement applicable to a plurality of jets in the electrospinning device.
Disclosure of Invention
The invention aims to solve the problem that an auxiliary electrode on an electrostatic spinning device in the prior art cannot be simultaneously applied to electric field enhancement of multiple jet flows, and provides an electrode-assisted disc type porous electrostatic spinning nozzle assembly.
In order to achieve the purpose, the invention adopts the following scheme:
an electrode-assisted disc-type porous electrostatic spinning nozzle assembly comprises a disc-type porous spinning nozzle, wherein the disc-type porous spinning nozzle mainly comprises a disc-type spinning disc, a columnar flow channel and a raised auxiliary electrode;
the dish-shaped wire spraying disc mainly comprises a coaxial hollow round table and a hollow cylinder, and the protruding auxiliary electrode mainly comprises a cylindrical electrode and a plurality of conical electrodes;
the flow channel, the hollow circular truncated cone, the hollow cylinder, the cylindrical electrode and the conical electrode are sequentially arranged from bottom to top, the large end of the hollow circular truncated cone is connected with the hollow cylinder, the small end of the hollow circular truncated cone is connected with the flow channel, the hollow cylinder and the cylindrical electrode are coaxial, the orthographic projection of the cylindrical electrode is positioned in the orthographic projection of the hollow cylinder, the height difference between the hollow cylinder and the cylindrical electrode is 5-20 mm (the height difference between the hollow cylinder and the cylindrical electrode is the vertical distance between the top of the hollow cylinder and the top of the cylindrical electrode, if the height difference is too large, the distance for enhancing the jet flow flight action is reduced, the time for jet flow stretching is shortened), the orthographic projection of all the conical electrodes is positioned in the orthographic projection of the cylindrical electrode, and the;
the dish-shaped wire spraying disc is provided with a plurality of through holes, all the through holes are the same in shape and size, all the cone electrodes are the same in shape and size, the number of the through holes is equal to the number of the cone electrodes, the liquid outlets of all the through holes are arranged on the outer circumferential surface of the hollow cylinder, all the through holes are arranged in an umbrella-shaped short-rib shape, the liquid inlets of all the through holes are arranged at the connecting end of the flow channel and the hollow circular truncated cone, all the liquid outlets, all the liquid inlets and all the cone electrodes are uniformly distributed around the circumference of the central shaft of the hollow cylinder, the extending directions of all the through holes are the same as the included angles of the central shaft of the hollow cylinder and are theta 1, the included angles of the central shafts of all the cone electrodes and the central shaft of the hollow cylinder are theta 2, so that the cone electrodes are symmetrically distributed by taking the hollow cylinder as the, enhancing the draft of the jet.
In the prior art, a plurality of layers of metal ring electrodes are coaxially and vertically arranged above a nozzle, so that an electric field is increased, or the metal ring electrodes are additionally arranged between a spray head and a receiving base material to increase the strength of the electric field, the electric field is concentrated at the center of a ring, and the metal ring electrodes are only suitable for the electric field enhancement of a single jet flow and cannot be simultaneously suitable for the electric field enhancement of a plurality of jet flows. The invention is suitable for the electric field enhancement of a plurality of jet flows because the raised auxiliary electrodes (the cylindrical electrode and the conical electrode) are arranged on the inner side of the hollow circular truncated cone and are coaxial with the hollow circular truncated cone, and the electric field formed by the raised auxiliary electrodes is in a symmetrical peripheral divergence shape instead of being concentrated on one point at the center.
The electric field enhancement principle of the invention is as follows:
the top of the dish-shaped spinneret plate is provided with a raised auxiliary electrode, the dish-shaped multi-hole spinneret plate is connected with a high-voltage power supply in the spinning process, and the dish-shaped spinneret plate, the cylindrical electrode and the conical electrode can be regarded as being connected in series, so that the electric potentials are the same
(
Greater than 0), the receiving substrate is communicated with the ground through a lead, the potential of the receiving substrate is 0, electric fields E1 and E2 are formed between the dish-shaped wire spraying disk and the convex auxiliary electrode and the receiving substrate respectively, the directions of the electric field lines of E1 and E2 are the same and all refer to the direction of the receiving substrate, and the convex auxiliary electrode is closer to the receiving substrate, and the electric field lines of E1 and E2 are all directed to the direction of the receiving substrateThe convex auxiliary electrode is provided with a conical electrode, so that E2 is larger than E1, when spinning solution flows out from a liquid outlet to form jet flow, the spinning solution is firstly under the action of an electric field E1 and is stretched and refined under the action of an electric field force, when the jet flow flies over the plane where the top of the convex auxiliary electrode is located, the jet flow is under the combined action of the electric field E1 and the electric field E2, and the jet flow is further stretched and refined into nano fibers until the nano fibers are finally received by the receiving substrate.
In addition, the invention achieves the purpose of controlling the diameter of the jet flow by controlling the liquid outlet speed and the included angle between the extending direction of all the through holes and the central axis of the hollow cylinder, ensures the liquid outlet quantity of all the through holes to be the same due to the same shape and size of all the through holes, further ensures the uniform distribution of the fiber diameter, and does not generate interference to the spinning jet flow because the invention controls the diameter of the jet flow by controlling related parameters rather than blowing. The specific mechanism is as follows:
the flow channel is positioned below the disc-shaped spinning disk, in the spinning process, spinning solution is uniformly distributed to a liquid inlet of each through hole through the flow channel, under the pushing of the pressure of the spinning solution, the spinning solution flows out from the liquid outlet of each through hole at an initial speed V to form jet flow, and is under the combined action of an electric field force Fe, a gravity force Fg, an inertia force Fp, a viscous force Fn, an air resistance Fa, a repulsion force Fc between the jet flows and a capillary force Fd, due to the adoption of a bottom-up spinning method, the resultant force F1 in the vertical direction is Fe + Fp multiplied by cos theta-Fn-Fa multiplied by cos theta-Fd-Fg, and the resultant force F2 in the horizontal direction is Fc + Fp multiplied by theta-Fa multiplied by sin theta, wherein theta is an included angle between the extending direction of all the through holes and the central axis of the hollow cylinder. In the electrostatic spinning process, the spinning voltage is dozens of kilovolts or even hundreds of kilovolts, so that the jet plays a dominant role in the movement process of electric field force and repulsion force between the jets, so that F1 is approximately equal to Fe, F2 is approximately equal to Fc, therefore, in the spinning process, the flying route of the solution flowing out of the through holes of the disc type multi-hole spinning nozzle can be approximately regarded as a parabola, the spinning jet flies along the parabola path, the flying route S of the spinning jet is influenced by the speed V and the included angle theta between the extending direction of all the through holes and the central axis of the hollow cylinder, and the relationship is satisfied:
wherein h is the distance from the nozzle to the receiving base material, m is the mass of the jet flow liquid drops, and the longer the distance of the path S is, the more sufficient the spinning jet flow is stretched, and the sufficient volatilization of the solvent is facilitated, so that the path S of the jet flow flying can be regulated and controlled by regulating and controlling V and theta in the spinning process, and the nano fibers with different diameters can be obtained. When V and theta are both minimum values, the flight path S of the jet flow is minimum at the moment, the jet flow is insufficient in stretching effect, and the diameter of the formed fiber is thick; when V and theta are both maximum, the flight distance S of the jet is maximum, the jet is fully stretched, and the diameter of the formed fiber is thinnest.
As a preferred technical scheme:
according to the electrode-assisted disc type porous electrostatic spinning spray head assembly, the cylindrical electrode extends downwards to the small end of the hollow circular truncated cone and is connected with the small end of the hollow circular truncated cone, and the diameter of the cylindrical electrode is the same as that of the small end of the hollow circular truncated cone.
According to the electrode-assisted disc type porous electrostatic spinning spray head assembly, the wall thicknesses of the hollow circular table and the hollow cylinder are uniform, namely the hollow part of the hollow circular table is in a circular table shape, the hollow part of the hollow cylinder is in a cylindrical shape, and the wall thicknesses of the hollow circular table and the hollow cylinder are 5-10 mm, the wall thicknesses of the hollow circular table and the hollow cylinder are not limited to the circular table shape, but the wall thickness is too small, so that the through holes are difficult to open, the wall thickness is too large, so that the material is easy to waste, the outer diameter of the large end of the hollow circular table is 25-100 mm, the outer diameter of the small end is 15-90 mm, the size of the hollow circular table determines the number of the through holes, the size of the hollow circular table is too small; the height of the conical electrode is 2-4 mm, and the radius of the bottom surface is 1-5 mm.
According to the electrode-assisted disc type porous electrostatic spinning spray head assembly, the number of the through holes is 8-100, the through holes are cylindrical, and the aperture of each through hole is 0.3-1.2 mm. The shape of the through-hole of the present invention is not limited thereto, and the cylindrical shape is more conventional and easy to process, and is therefore preferable as the present invention. The aperture of the through hole influences the liquid output amount of the spinning solution, the aperture is too small, the liquid output amount is too small, the yield is low, and the production efficiency is low; the aperture is too large, the liquid output is too large, and the smooth operation of spinning processing is influenced. The hole depth of the through holes mainly depends on the outer diameter of the large end of the hollow circular truncated cone, the outer diameter of the small end of the hollow circular truncated cone and included angles between the extending directions of all the through holes and the central axis of the hollow cylinder, and the larger the hole depth is, the larger the pressure required for pushing the spinning solution is, and the more the energy consumption is.
According to the electrode auxiliary disc type porous electrostatic spinning spray head assembly, the flow channel is in a hollow cylindrical shape, the outer diameter of the flow channel is equal to that of the small end of the hollow circular truncated cone, and the wall thickness of the flow channel is 3-5 mm.
According to the electrode auxiliary disc type porous electrostatic spinning spray head assembly, the insulating cover is sleeved on the flow channel, and the disc-shaped spray head disc is positioned in the insulating cover.
According to the electrode auxiliary disc type porous electrostatic spinning spray head assembly, the insulating cover is an integrated part and consists of the cylindrical barrel and the circular truncated cone-shaped cover body, and the barrel is in threaded connection with the flow channel.
According to the electrode auxiliary disc type porous electrostatic spinning nozzle assembly, the insulating cover is made of polyformaldehyde, polypropylene, polyethylene, polycarbonate, poly-p-phenylene terephthalamide, polyvinyl chloride or polyether ether ketone.
According to the electrode-assisted disc type porous electrostatic spinning spray head assembly, the value range of theta 1 is more than or equal to 45 degrees and less than or equal to 90 degrees, if the included angle is more than 90 degrees, the through holes are inclined downwards, spinning from bottom to top is not facilitated, and if the included angle is too small, the distance between the through holes is too close, and the number of the openable through holes is limited.
According to the electrode-assisted disc type porous electrostatic spinning nozzle assembly, the disc type porous spinneret is an integrated piece and is made of copper, aluminum, iron, copper alloy or aluminum alloy.
Has the advantages that:
(1) according to the electrode-assisted disc type porous electrostatic spinning nozzle assembly, the disc type porous spinneret avoids large-area contact of spinning solution with the environment, the unstable spinning phenomenon caused by solvent volatilization is prevented, the used nozzle can be cleaned by air injection of a high-pressure air gun, the electrode-assisted disc type porous electrostatic spinning nozzle assembly is easy to care, and the production efficiency and the stability are improved;
(2) according to the electrode-assisted disc type porous electrostatic spinning nozzle assembly, in the spinning process, longitudinal electric fields which are circumferentially and symmetrically distributed are formed between the protruding auxiliary electrode and the receiving base material of the disc type porous spinneret, and the electric field formed in the middle of the electric field formed at the circumference is strong, so that the spinning multi-jet flow can be further drafted and refined.
Drawings
FIG. 1 is a schematic diagram of electric field lines formed by the electrode-assisted disc-type multi-hole electrospinning nozzle assembly of the present invention, wherein E1 and E2 are electric fields formed between the disc-shaped spinning disc, the protruding auxiliary electrode, and the receiving substrate, respectively;
FIG. 2 is a diagram illustrating the distribution of electric field intensity formed by the protruding auxiliary electrode according to the present invention;
FIG. 3 is a scanning electron microscope image (magnification is 20000 times) of a fiber membrane prepared by the electrode-assisted disc-type porous electrostatic spinning nozzle assembly of the present invention, wherein (a) no protrusion auxiliary electrode is added, and (b) protrusion auxiliary electrode is added;
FIG. 4 is a schematic diagram of an electrode-assisted disk-type multi-orifice spinning pack according to an embodiment of the present invention;
FIG. 5 is a schematic view of the dish multi-hole spinneret of FIG. 4;
FIG. 6 is a schematic view of the flow channels of the dish-type multi-hole spinneret of FIG. 4;
FIG. 7 is a schematic view of the insulating cover of FIG. 4;
wherein, 1-disc type multi-hole spinning nozzle, 2-insulating cover, 3-disc type spinning disc, 4-flow channel, 5-convex auxiliary electrode, 6-through hole, 7-cover body and 8-cylinder body.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. 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.
An electrode-assisted disc-type multi-hole electrostatic spinning nozzle assembly, as shown in fig. 4, comprises a disc-type multi-hole spinneret;
a disc-type multi-hole spinneret 1, as shown in fig. 5, which is an integral part composed of a disc-shaped spinneret plate 3, a columnar flow channel and a protruding auxiliary electrode 5, and is made of copper, aluminum, iron, copper alloy or aluminum alloy;
the dish-shaped wire spraying disc consists of a hollow round table and a hollow cylinder which are coaxial; the wall thickness of the hollow round table and the wall thickness of the hollow cylinder are uniform, the wall thickness is 5-10 mm, the outer diameter of the large end of the hollow round table is 25-100 mm, the outer diameter of the small end of the hollow round table is 15-90 mm, and the height of the hollow cylinder is 4-8 mm;
the flow channel 4 is in a hollow cylindrical shape, as shown in fig. 6, the outer diameter of the flow channel is equal to that of the small end of the hollow circular truncated cone, and the wall thickness of the flow channel is 3-5 mm;
the runner is sleeved with an insulating cover 2, the insulating cover is shown in figure 7, and the dish-shaped spinneret plate is positioned in the insulating cover; the insulating cover is an integrated part consisting of a cylindrical barrel 8 and a circular truncated cone-shaped cover body 7, and the barrel is in threaded connection with the flow channel; the insulating cover is made of polyformaldehyde, polypropylene, polyethylene, polycarbonate, poly-p-phenylene terephthalamide, polyvinyl chloride or polyether ether ketone;
the convex auxiliary electrode consists of a cylindrical electrode and a plurality of conical electrodes with the same shape and size; wherein the height of the conical electrode is 2-4 mm, and the radius of the bottom surface is 1-5 mm; the cylindrical electrode extends downwards to the small end of the hollow circular truncated cone and is connected with the small end of the hollow circular truncated cone, and the diameter of the cylindrical electrode is the same as that of the small end of the hollow circular truncated cone;
the flow channel, the hollow circular truncated cone, the hollow cylinder, the cylindrical electrode and the conical electrodes are sequentially arranged from bottom to top, the large end of the hollow circular truncated cone is connected with the hollow cylinder, the small end of the hollow circular truncated cone is connected with the flow channel, the hollow cylinder and the cylindrical electrode are coaxial, the orthographic projection of the cylindrical electrode is positioned in the orthographic projection of the hollow cylinder, the height difference between the hollow cylinder and the cylindrical electrode is 5-20 mm, the orthographic projections of all the conical electrodes are positioned in the orthographic projection of the cylindrical electrode, and the conical tops of all the conical electrodes are upward;
8-100 cylindrical through holes 6 with the same shape and size are arranged on the dish-shaped wire spraying plate, and the aperture of each through hole is 0.3-1.2 mm; the number of the through holes is equal to that of the conical electrodes; the liquid outlets of all the through holes are arranged on the peripheral surface of the hollow cylinder, the liquid inlets of all the through holes are arranged on the connecting end of the runner and the hollow circular truncated cone, and all the liquid outlets, all the liquid inlets and all the conical electrodes are uniformly distributed around the circumference of the central shaft of the hollow cylinder; the included angles between the extending directions of all the through holes and the central axis of the hollow cylinder are the same and are theta 1, and the value range of the theta 1 is more than or equal to 45 degrees and less than or equal to 90 degrees; the central axes of all the conical electrodes and the central axis of the hollow cylinder form the same included angle theta 2, and theta 1 is equal to theta 2.
The electrode-assisted disc-type porous electrostatic spinning nozzle assembly is used for an electrostatic spinning test 1 of PAN spinning stock solution, and the disc-type porous spinning nozzle is connected with a high-voltage power supply in the spinning process due to the fact that the protruding auxiliary electrode is arranged at the top of the disc-type spinning disc, the disc-type porous spinning disc, the cylindrical electrode and the conical electrode can be regarded as being connected in series, so that the disc-type porous electrostatic spinning nozzle assembly has the same potential, namely
(
Greater than 0), the receiving substrate is communicated with the ground through a lead, the potential of the receiving substrate is 0, electric fields E1 and E2 are formed between the dish-shaped spraying plate and the convex auxiliary electrode and the receiving substrate respectively, the directions of the electric field lines of E1 and E2 are the same (as shown in figure 1), and are all towards the direction of the receiving substrate, and because the distance between the convex auxiliary electrode and the receiving substrate is closer, and the convex auxiliary electrode is provided with a conical electrode, E2 is greater than E1;
in addition, the distribution of the electric field intensity formed by the protruding auxiliary electrode is as shown in FIG. 2 (FIG. 2 is the electric field intensity formed by the planes of any two conical electrodes symmetrical along the central axis), and the electric field intensity of the protruding auxiliary electrode is the maximum (5.0 x 10^ s)6V/m) is located around the circumference instead of the center and reaches a maximum at the axis of each conical electrode due to the smaller radius of curvature at the cone apex of the conical electrode according to the formula
Wherein t is the charge density, Q is the charge amount, and r is the curvature radius; it can be known that the smaller the curvature radius, the higher the charge density, the stronger the electric field formed, and therefore, the electric field intensity formed at the conical tip of the conical electrode is the largest;
and in the spinning process, the flying route of the solution flowing out of the through holes of the disc type multi-hole spinning nozzle can be approximately regarded as a parabola, the spinning jet flies along the path of the parabola, the flying route S of the spinning jet is influenced by the speed V and the included angle theta between the extending direction of all the through holes and the central axis of the hollow cylinder, and the spinning jet satisfies the relational expression:
wherein h is the distance from the nozzle to the receiving substrate, and m is the mass of the jet droplets; therefore, the distance S of jet flow flight can be regulated and controlled by regulating and controlling V and theta in the spinning process, so that the nano fibers with different diameters can be obtained; when V and theta are both minimum values, the flight path S of the jet flow is minimum at the moment, the jet flow is insufficient in stretching effect, and the diameter of the formed fiber is thick; when V and theta are both maximum, the flight distance S of the jet is maximum, the jet is fully stretched, and the diameter of the formed fiber is thinnest.
The spinning process parameters for test 1 were set as: the obtained nanofiber membrane was subjected to a scanning electron microscope test at a spinning voltage of 50kV, a spinning distance of 20cm, a temperature of 25 ± 2 ℃, a humidity of 60 ± 5%, V ═ 20mm/s, and θ ═ 90 °, and the result is shown in fig. 3 (b), and further the average diameter of the nanofiber membrane was 116nm and the standard deviation was 9 as measured with a measuring tool;
comparing test 1 and test 2, it can be seen that the average diameter of the fibers of test 1 is smaller and the standard deviation is small, i.e. the fibers are uniformly distributed; the average diameter of the fibers of trial 1 was smaller because E2 was greater than E1 in trial 1; when the spinning solution flows out from the liquid outlet to form jet flow, the spinning solution is firstly under the action of an electric field E1 and is stretched and refined under the action of the electric field force; when the jet flow flies over the plane where the tops of the convex auxiliary electrodes are located, the jet flow is under the combined action of the electric fields E1 and E2, and the jet flow is further stretched and refined into nano fibers until the nano fibers are finally received by the receiving substrate; the test 2 does not contain an auxiliary electrode and does not have the effect of E2, so the jet flow only receives the effect of E1 in the whole process, the degree of stretching and thinning is not as good as that of the test 1, and the fiber diameter is larger;
the reason that the fiber distribution of the experiment 1 is uniform is that the electric field intensity formed at the conical top of the conical electrode is the largest, and for the disc-type porous electrostatic spinning nozzle assembly, the formed electric field distribution is the circumferential electric field intensity and the middle is weak, and the electric field distribution rule is favorable for simultaneously enhancing the electric field intensity for forming multiple jet flows, so that the stretching and thinning of the multiple jet flows are more sufficient, the stretching effect on each jet flow is the same, and the diameter distribution of the multiple jet flow fibers in the experiment 1 is uniform;
comparing the test 1 with the test 3, the average diameter of the fiber of the test 1 is smaller, and the result proves that the disc-type porous spinneret assembly for electrostatic spinning can be used for an electrostatic spinning device with controllable jet flow, and the path of the spinning jet flow is regulated and controlled by regulating and controlling the speed V of the spinning solution and the inclination angle theta of the through holes, so that the nano fibers with different diameters are obtained; in addition, the standard deviation of the fiber diameter is 9 and 20 respectively, which shows that the production efficiency and the stability of the disc type porous spinneret assembly for electrostatic spinning are good;
therefore, in the electrode-assisted disc type porous electrostatic spinning nozzle assembly, in the spinning process, longitudinal electric fields which are circumferentially and symmetrically distributed are formed between the convex auxiliary electrodes and the receiving base material of the disc type porous spinneret, and the electric field formed in the middle of the electric field strength formed at the circumference is weak, so that the spinning multi-jet flow can be further drafted and refined; and the path of spinning jet flow can be regulated and controlled by regulating and controlling the speed V of the spinning solution and the inclination angle theta of the through holes, so that the nano fibers with different diameters can be obtained.
Claims (10)
1. The utility model provides a porous electrostatic spinning shower nozzle subassembly of dish formula is assisted to electrode, characterized by: the device comprises a disc-shaped multi-hole spinning nozzle, wherein the disc-shaped multi-hole spinning nozzle mainly comprises a disc-shaped spinning disk, a columnar flow channel and a raised auxiliary electrode;
the dish-shaped wire spraying disc mainly comprises a coaxial hollow round table and a hollow cylinder, and the protruding auxiliary electrode mainly comprises a cylindrical electrode and a plurality of conical electrodes;
the flow channel, the hollow circular truncated cone, the hollow cylinder, the cylindrical electrode and the conical electrodes are sequentially arranged from bottom to top, the large end of the hollow circular truncated cone is connected with the hollow cylinder, the small end of the hollow circular truncated cone is connected with the flow channel, the hollow cylinder and the cylindrical electrode are coaxial, the orthographic projection of the cylindrical electrode is positioned in the orthographic projection of the hollow cylinder, the height difference between the hollow cylinder and the cylindrical electrode is 5-20 mm, the orthographic projections of all the conical electrodes are positioned in the orthographic projection of the cylindrical electrode, and the conical tops of all the conical electrodes are upward;
be equipped with a plurality of through-holes on the dish-shaped wire spray dish, the shape and the size of all through-holes are the same, the shape and the size of all circular cone electrodes are the same, the quantity of through-hole equals the quantity of circular cone electrode, the liquid outlet setting of all through-holes is on hollow cylindrical outer peripheral face, the inlet setting of all through-holes is on the connecting end of runner and hollow round platform, all liquid outlets, all liquid inlets and all circular cone electrodes encircle hollow cylindrical center pin circumference equipartition, the extending direction of all through-holes is the same with the contained angle of hollow cylindrical center pin, all be theta 1, the center pin of all circular cone electrodes is the same with the contained angle of hollow cylindrical center pin, all be theta 2, theta 1 equals.
2. The electrode-assisted dish-type multi-hole electrospinning spray head assembly of claim 1, wherein the cylindrical electrode extends downward to and is connected with the small end of the hollow circular truncated cone, and the diameter of the cylindrical electrode is the same as that of the small end of the hollow circular truncated cone.
3. The electrode-assisted disc type porous electrostatic spinning spray head assembly according to claim 1, wherein the wall thickness of the hollow circular table and the hollow cylinder is uniform, the wall thickness of the hollow circular table and the hollow cylinder is 5-10 mm, the outer diameter of the large end of the hollow circular table is 25-100 mm, the outer diameter of the small end of the hollow circular table is 15-90 mm, and the height of the hollow cylinder is 4-8 mm; the height of the conical electrode is 2-4 mm, and the radius of the bottom surface is 1-5 mm.
4. The electrode-assisted disc-type multi-hole electrostatic spinning nozzle assembly of claim 1, wherein the number of the through holes is 8-100, the through holes are cylindrical, and the diameter of the through holes is 0.3-1.2 mm.
5. The electrode-assisted disc type porous electrostatic spinning nozzle assembly according to claim 1, wherein the flow channel is hollow cylindrical, the outer diameter of the flow channel is equal to the outer diameter of the small end of the hollow circular truncated cone, and the wall thickness of the flow channel is 3-5 mm.
6. The electrode-assisted disc-type multi-hole electrostatic spinning nozzle assembly as claimed in claim 5, wherein the flow channel is sleeved with an insulating cover, and the disc-shaped nozzle plate is located in the insulating cover.
7. The electrode-assisted disc-type porous electrostatic spinning nozzle assembly according to claim 6, wherein the insulating cover is an integrally formed part and comprises a cylindrical barrel body and a circular truncated cone-shaped cover body, and the barrel body is in threaded connection with the flow passage.
8. The electrode-assisted dish-type multi-orifice electrospinning nozzle assembly of claim 7, wherein the insulating cover is made of polyoxymethylene, polypropylene, polyethylene, polycarbonate, poly-paraphenylene terephthalamide, polyvinyl chloride, or polyether ether ketone.
9. The electrode-assisted disc-type multi-hole electrostatic spinning nozzle assembly according to claim 1, wherein θ 1 is in a range of 45 ° to 90 °.
10. The electrode-assisted disc-type multi-hole electrostatic spinning nozzle assembly of claim 1, wherein the disc-type multi-hole spinneret is an integral piece made of copper, aluminum, iron, copper alloy or aluminum alloy.
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| CN201911055469.4A CN110735192B (en) | 2019-10-31 | 2019-10-31 | Electrode-assisted disc type porous electrostatic spinning spray head assembly |
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