CN115584563A - Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method - Google Patents
Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method Download PDFInfo
- Publication number
- CN115584563A CN115584563A CN202211321383.3A CN202211321383A CN115584563A CN 115584563 A CN115584563 A CN 115584563A CN 202211321383 A CN202211321383 A CN 202211321383A CN 115584563 A CN115584563 A CN 115584563A
- Authority
- CN
- China
- Prior art keywords
- wire electrode
- hollow
- hollow wire
- holes
- adjacent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention discloses a hollow wire electrode, an electrostatic spinning device, application and an electrostatic spinning method. The hollow wire electrode comprises an inner layer hollow tube and an outer layer metal layer; a plurality of through holes I are formed in the semi-circumferential side face of the inner-layer hollow tube; the semi-circumference side surface of the inner layer hollow tube refers to a side surface with a central angle of 180 degrees corresponding to a tangential plane in the circumferential direction of the inner layer hollow tube; the semi-circumferential side surface of the outer metal layer is a side surface with a central angle of 180 degrees corresponding to the circumferential tangent plane of the outer metal layer; the through hole I and the through hole II form a continuous through hole. When the hollow line electrode is used for electrostatic spinning, the phenomena of yarn floating and yarn breaking are obviously reduced, and the stability of continuous production, the utilization rate of raw materials, the yield and the production efficiency are improved.
Description
Technical Field
The invention particularly relates to a hollow wire electrode, an electrostatic spinning device, application and an electrostatic spinning method.
Background
With the development of modern science and technology, researchers put forward higher and higher requirements on material performance, and among materials which are rapidly developed and widely applied, the nanofiber has extremely wide application prospects in the fields of high-performance drivers, energy engineering, filter materials, medical sanitation and catalysis due to the unique size effect, and becomes one of the important pillars for driving the progress of modern science and technology, so that higher requirements are put forward on the efficient and stable preparation technology of the nanofiber.
The electrospinning technique is considered to be one of the most effective means for preparing nanofibers in recent years due to its advantages of simple manufacturing equipment and controllable process. Electrostatic spinning is a method for charging polymer solution by using high-voltage static electricity, when the electric field force overcomes the surface tension and viscous force of the solution, micro jet flow can be ejected from the surface of the solution, the jet flow is stretched and refined under the action of the electric field force, and finally the nano fiber with the diameter ranging from dozens of nanometers to hundreds of nanometers is solidified along with the volatilization of the solution.
Generally, a needle-free electrostatic spinning device adopts a metal wire with a smooth surface or a spiral shape as a wire electrode, a spinning solution is supplied to a coating tank by a liquid supply pump to immerse the wire electrode, the coating tank is matched with a reciprocating device table to reciprocate, the spinning solution is scraped and coated on the wire electrode, and then excitation and splitting are carried out under the action of an electric field.
The existing electrostatic spinning process mainly has the following defects:
(1) The product uniformity is low: the spinning solution coated on the line electrode is in direct contact with air for a long time, and the spinning solution is easy to generate various abnormalities, such as solution water absorption deterioration, solute precipitation, abnormal solution viscosity increase and the like, and the stability of the spinning solution is slightly influenced, so that the electrostatic spinning excitation process is obviously influenced negatively, and the problems of liquid drop splashing, insufficient fiber stretching, large defects of products and the like are caused; when the continuous production is serious, the precipitated solute or the deteriorated solution can be coated on the surface of the wire electrode, so that the spinning solution cannot be normally excited in the coated area, the uniformity of a product is obviously reduced, and the influence on the stability of the continuous production is more and more serious along with the prolonging of the production time.
(2) The utilization rate of raw materials is low: the spinning solution is deteriorated after being exposed in the air for a long time, so that the recycling difficulty is increased, even the spinning solution cannot be recycled, the utilization rate of raw materials is finally obviously reduced, and the product cost is improved.
(3) The product yield is low: among the reciprocating type line electrode coating mode, solution excites along with the fibre on the line electrode, solution volume can reduce along with arousing on the line, when solution volume is low excessively, the line electrode arouses stability and can show and reduce, consequently arouse process stability for guaranteeing, the normal complete spinning liquid volume that arouses of demand than equipment to supply liquid volume is greatly (need excessive confession liquid promptly), this just leads to a large amount of solution to be scraped directly, the solution of being scraped to both sides exposes in the air for a long time, can take place rotten, lead to the unusual rising of spinning liquid viscosity, probably take place seriously to get rid of under high-voltage electric field drives and spatter, finally lead to both sides product unable use, the product yields also can reduce.
(4) The phenomena of filament floating and filament breakage are serious, and hidden dangers exist: excitation point positions of a reciprocating line electrode coating mode are randomly distributed, spinning liquid is easy to gather to form liquid drops on the lower portion of the line electrode under the action of gravity, the charge density of the liquid drops is improved due to the point discharge effect and the liquid drops are easy to excite, the liquid is excited downwards, the liquid drops fly upwards and stretch under the action of an electric field force, phenomena of filament floating, filament breaking and the like are easy to cause, the uniformity and the quality of products are affected, meanwhile, nano fibers are easy to accumulate in a spinning cabin, and fire hazard exists.
However, because the electrostatic spinning has a time difference (about 1-2 seconds) from solution coating to excitation, the liquid supply method of the reciprocating wire electrode coating inevitably goes through a cycle of "coating while erasing-waiting-excitation-coating while erasing", and the ratio of the unexcited time to the total production time increases continuously with the increase of the coating speed, and in the limit, if the reciprocating time is shortened to less than 2 seconds, the yield can be regarded as zero, and finally the production efficiency is low.
The above-mentioned defects existing in the current electrostatic spinning process need to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of obvious filament floating and filament breakage phenomena in the conventional electrostatic spinning process, and provides a hollow line electrode, an electrostatic spinning device, application and an electrostatic spinning method. The phenomena of yarn floating and yarn breaking are obviously reduced when the hollow line electrode is adopted for electrostatic spinning.
The present invention provides the following technical solutions to solve the above technical problems.
The invention provides a hollow wire electrode, which comprises an inner hollow tube and an outer metal layer;
the semi-circumferential side surface of the inner-layer hollow tube is a side surface with a central angle of 180 degrees corresponding to a circumferential tangent plane of the inner-layer hollow tube; the semi-circumferential side surface of the outer metal layer is a side surface with a central angle of 180 degrees corresponding to a circumferential tangent plane of the outer metal layer; the through hole I and the through hole II form a continuous through hole;
(1) The through hole I satisfies the following conditions:
the distance between any two adjacent through holes I on the same section in the extension direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes I on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5-1/2 of the circumference;
(2) The through hole II satisfies the following conditions:
the distance between any two adjacent through holes II on the same section in the extension direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes II on the same section in the circumferential direction of the hollow wire electrode is 1/5-1/2 circumference;
the circumferential direction of the hollow wire electrode is a direction perpendicular to the extension direction of the hollow wire electrode.
In the present invention, it is preferable that the distance between any two adjacent through holes i on the same cross section in the direction of the extension line of the hollow wire electrode is 3 to 7cm, for example, 4cm, 5cm, or 6cm.
In the present invention, it is preferable that the distance between any two adjacent through holes ii on the same cross section in the extension direction of the hollow wire electrode is 3 to 7cm, for example, 4cm, 5cm or 6cm.
In the present invention, preferably, the distance between any two adjacent through holes i on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5 to 1/3 of a circumference, for example, 1/4 of a circumference.
In the present invention, preferably, the distance between any two adjacent through holes ii on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5 to 1/3 of a circle, for example, 1/4 of a circle.
In the present invention, preferably, the through holes i and the through holes ii correspond to each other one to one, and the "one to one correspondence" means that the through holes i and the through holes ii can completely correspond to each other and overlap each other.
In the present invention, the outer diameter of the inner hollow tube may be 2 to 5mm, for example 3mm or 4mm.
In the present invention, the inner diameter of the inner hollow tube may be 1 to 4mm, for example 2mm or 3mm.
In the present invention, the material of the inner hollow tube may be conventional in the art, such as teflon.
In the present invention, the thickness of the outer metal layer may be 0.5 to 1mm, for example, 0.5mm.
In the invention, the outer metal layer is generally connected with a high-voltage power supply; the high voltage power supply provides a positive voltage.
The invention also provides an electrostatic spinning device comprising the hollow wire electrode.
In the present invention, the hollow wire electrode is preferably horizontally placed in the electrospinning device such that the side provided with the through-hole faces upward, and the "upward" means a direction away from the ground.
In some embodiments of the invention, the electrostatic spinning device comprises a liquid storage cylinder, a liquid supply pump, an adapter, a hollow line electrode, a high-voltage power supply and a receiving device; the lower part of the liquid storage cylinder is connected with the liquid supply pump through a pipeline A; one side of the liquid supply pump is connected with one end of the hollow wire electrode through a pipeline B, and the pipeline B is connected with the hollow wire electrode through the adapter; one end of the hollow line electrode, which is not connected with the pipeline B, is connected with the high-voltage power supply through a lead;
the hollow wire electrode is horizontally arranged, so that one side provided with the through hole faces upwards, and the upward direction is a direction far away from the ground;
the receiving device is positioned above the hollow wire electrode and is parallel to the hollow wire electrode in the direction of the extension line of the hollow wire electrode.
In the description of the present invention, the terms "lower", "above", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The invention also provides an electrostatic spinning method, which comprises the steps of introducing the spinning solution into the hollow wire electrode or introducing the spinning solution into the hollow wire electrode in the electrostatic spinning device;
wherein the liquid supply speed of the spinning solution is 3.5-9.5mL/min per meter of hollow wire electrode;
when the spinning solution is introduced into the hollow wire electrode, the flowing direction of the spinning solution is the extending direction of the hollow wire electrode;
when the spinning solution is introduced into the hollow wire electrode in the electrostatic spinning device as described above, the flow direction of the spinning solution is opposite to the direction of the current introduced into the hollow wire electrode.
In the present invention, the liquid supply rate is preferably 4-8mL/min per meter of hollow wire electrode, for example 5mL/min per meter of hollow wire electrode, 6mL/min per meter of hollow wire electrode or 7mL/min per meter of hollow wire electrode.
In some embodiments of the present invention, the electrospinning process comprises the steps of:
the spinning solution is stored in a solution cylinder and pumped into the hollow line electrode through the adapter by a liquid supply pump, the spinning solution is discharged through holes in the inner layer and the outer layer of the hollow line electrode, a metal layer on the surface of the hollow line electrode is connected with a high-voltage power supply through a lead, and when the high-voltage power supply is switched on, the high voltage is applied to the hollow line electrode, so that the spinning solution is immediately stretched and refined under the action of a high-voltage electric field after being extruded and is solidified into nano fibers, and finally the nano fibers are collected by a non-woven fabric substrate carried by a receiving device.
The invention also provides a hollow wire electrode as described above, or the use of an electrospinning device as described above in an electrospinning process.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
1. the hollow line electrode can adjust the excitation point position, so that most of the excitation process occurs above the line electrode, and the phenomenon of filament floating is obviously reduced.
2. The hollow wire electrode can seal the spinning solution in the pipeline, and the spinning solution is in direct contact with air only shortly before excitation, so that the problems of deterioration and precipitation are not easy to occur, the problem that the wire electrode cannot be excited because the wire electrode is coated by precipitates does not exist under normal conditions, and the stability of continuous production is obviously improved.
3. The hollow line electrode can keep the spinning solution in a continuous excitation state, improve the uniformity of the product and improve the production efficiency.
4. The hollow line electrode can avoid the problem of excessive liquid supply, and the utilization rate of raw materials is obviously improved; the solution scraped to the two sides does not go bad, the defect caused by splashing of the solution on the two sides is avoided, and the yield is improved.
Drawings
Fig. 1 is a schematic view of the entire structure of a hollow wire electrode of embodiment 1.
Fig. 2 is a schematic structural view of the hollow wire electrode of example 1 in the extension direction of the hollow wire electrode.
Fig. 3 is a schematic view of a side-position hole structure of a section of the hollow wire electrode in the circumferential direction of the hollow wire electrode in example 1.
Fig. 4 is a schematic structural view of an electrospinning device used in the present invention.
The reference numbers are as follows:
inner hollow tube 1
Through hole 3
Liquid storage cylinder 4
High voltage power supply 8
Receiving device 9
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The reagents used in the examples of the invention are all commercially available products.
The hollow wire electrode of the present invention will be clearly and completely described with reference to fig. 1 to 3. The method comprises the following specific steps:
as shown in fig. 1, the hollow wire electrode used in the electrospinning method of the present invention includes: an inner layer hollow pipe 1 and an outer layer metal layer 2; a plurality of through holes I are formed in the semi-circumferential side surface of the inner layer hollow tube 1; the semi-circumference side surface of the inner layer hollow tube 1 is the side surface with a central angle of 180 degrees corresponding to the section of the inner layer hollow tube 1 in the circumferential direction; a plurality of through holes II are formed in the semi-circumferential side surface of the outer metal layer 2; the semi-circumferential side surface of the outer metal layer 2 refers to a side surface with a central angle of 180 degrees corresponding to the circumferential tangent plane of the outer metal layer 2; the through hole I and the through hole II form a continuous through hole;
(1) The through-hole I satisfies the following condition:
the distance between any two adjacent through holes I on the same section in the extension line direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes I on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5-1/2 of the circumference;
(2) The through hole ii satisfies the following conditions:
the distance between any two adjacent through holes II on the same section in the extension line direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes II on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5-1/2 of the circumference;
the circumferential direction of the hollow wire electrode is the direction perpendicular to the extension direction of the hollow wire electrode;
specifically, the distance between any two adjacent through holes I on the same section in the extension line direction of the hollow wire electrode is 3-7cm, for example, 4cm, 5cm or 6cm.
Specifically, the distance between any two adjacent through holes II on the same section in the extension direction of the hollow wire electrode is 3-7cm, such as 4cm, 5cm or 6cm;
specifically, the distance between any two adjacent through holes I on the same section in the circumferential direction of the hollow wire electrode is 1/5-1/3 of the circumference, such as 1/4 of the circumference;
specifically, the distance between any two adjacent through holes II on the same section in the circumferential direction of the hollow wire electrode is 1/5-1/3 of a circle, for example 1/4 of a circle;
specifically, the through holes I correspond to the through holes II one by one, and the one-to-one correspondence means that the through holes I and the through holes II can be completely coincided correspondingly;
specifically, the outer diameter of the inner hollow tube 1 is 2-5mm, for example 3mm or 4mm;
specifically, the inner diameter of the inner hollow tube 1 is 1-4mm, such as 2mm or 3mm;
specifically, the inner layer hollow tube 1 is made of polytetrafluoroethylene;
specifically, the thickness of the outer metal layer 2 is 0.5-1mm, for example, 0.5mm;
specifically, the outer metal layer 2 is connected with a high-voltage power supply; the high voltage power supply provides a positive voltage.
As shown in fig. 4, the electrostatic spinning device used in the electrostatic spinning method of the present invention includes a liquid storage cylinder 4, a liquid supply pump 5, an adapter 6, a hollow wire electrode 7, a high voltage power supply 8, and a receiving device 9; the lower part of the liquid storage cylinder 4 is connected with a liquid supply pump 5 through a pipeline A; one side of the liquid supply pump 5 is connected with one end of the hollow wire electrode 7 through a pipeline B, and the pipeline B is connected with the hollow wire electrode 7 through an adapter 6; one end of the hollow line electrode, which is not connected with the pipeline B, is connected with a high-voltage power supply 8 through a lead;
the hollow wire electrode 7 is horizontally placed so that the side provided with the through hole faces upward, and the upward direction means a direction away from the ground;
the receiving device 9 is positioned above the hollow wire electrode 7 and is parallel to the hollow wire electrode in the direction of the extension line of the hollow wire electrode;
the terms "lower" and "upper" indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 4.
The electrostatic spinning method comprises the following steps:
the spinning solution flows in from an inner layer hollow tube 1 (polytetrafluoroethylene inner tube) of a hollow wire electrode by a liquid supply pump in an electrostatic spinning device, is extruded to the surface of the wire electrode along a through hole 3 on the hollow wire electrode, an outer layer metal layer 2 of the hollow wire electrode is connected with a lead for a high-voltage power supply, when the high-voltage power supply is switched on, the high voltage is applied to the hollow wire electrode, and the extruded solution is excited, stretched and solidified at the through hole 3 on the hollow wire electrode under the action of the high-voltage power supply, so that a nanofiber product is finally formed.
Example 1
In the electrospinning method of this example, the specific experimental parameters are as follows:
spinning solution: the spinning solution for preparing the nanofibers is conventional in the art, such as polyurethane electrospinning solution.
Spinning parameters are as follows: spinning voltage is 45kv, distance between the electrode wire and the collecting base material is 25cm, winding speed of the base material is 0.1m/min, temperature in the spinning cabin is 35 ℃, humidity in the spinning cabin is 30%, liquid supply speed of the spinning solution is as follows: the hollow wire electrode per meter was 5mL/min.
An electrostatic spinning device: model MF01-006 of an electrostatic spinning machine of Foshan California precision measurement and control technology company Limited.
The overall structure of the hollow wire electrode in the electrostatic spinning device is as follows:
the inner layer of the hollow wire electrode is a polytetrafluoroethylene hollow tube (the outer diameter is 3mm, the inner diameter is 2 mm), the outer layer is a coated metal layer (the thickness is 0.5 mm), and the outer layer is connected with a high-voltage power supply to provide positive high voltage. The inner layer polytetrafluoroethylene hollow tube is provided with a plurality of through holes I (the aperture is 0.3 mm), the outer layer metal layer is provided with a plurality of through holes II (the aperture is 0.3 mm), the through holes I and the through holes II are completely overlapped, and the distance between any two adjacent through holes I on the same tangent plane in the extension line direction of the hollow wire electrode is 3cm; the angle of any two adjacent through holes I on the same section in the circumferential direction of the hollow wire electrode is 90 degrees (namely, the distance between any two adjacent through holes I on the same section in the circumferential direction of the hollow wire electrode is 1/4 of a circle).
Example 1 the nanofiber production efficiency was 10g/min.
Example 2
In the hollow wire electrode adopted in example 2, only 1 through hole i is formed in the same section in the circumferential direction of the inner layer polytetrafluoroethylene hollow tube of the hollow wire electrode, the through holes i are arranged in the extension line direction of the hollow wire electrode, only 1 through hole ii is formed in the same section in the circumferential direction of the outer layer metal layer, the through holes i and the through holes ii are completely overlapped, the distance between any two adjacent through holes i in the same section in the extension line direction of the hollow wire electrode is 6cm, and other structural parameters are the same as those of the hollow wire electrode adopted in example 1; other experimental conditions were the same as in example 1.
Example 2 the nanofiber production efficiency was 3g/min.
Example 3
In the hollow wire electrode used in example 3, the distance between any two adjacent through holes i on the same cross section in the extension direction of the hollow wire electrode was 2cm, and other structural parameters were the same as those of the hollow wire electrode used in example 1, and other experimental conditions were the same as those of example 1. In the electrostatic spinning process, the abnormal shaking phenomenon of jet flow can be observed, and the nanofibers are partially rejected in the flight process and cannot be directly and effectively collected by a negative plate.
Example 3 the nanofiber production efficiency was 6g/min.
Example 4
In the hollow wire used in example 4, the angle of any two adjacent through holes i on the same section in the circumferential direction of the hollow wire electrode was 30 ° (that is, the pitch of any two adjacent through holes i on the same section in the circumferential direction of the hollow wire electrode was 1/12 circumference), and other structural parameters were the same as those of the hollow wire electrode used in example 1, and other experimental conditions were the same as those of example 1. It can be observed that two nanofiber bundles excited on the same cross section point generate obvious repulsion phenomenon, which causes fiber disturbance, fiber floating phenomenon and poor collection.
Example 4 the nanofiber production efficiency was 6g/min.
Example 5
In the hollow wire electrode used in example 5, the angle of any two adjacent through holes i on the same section in the circumferential direction of the hollow wire electrode was 180 ° (that is, the pitch of any two adjacent through holes i on the same section in the circumferential direction of the hollow wire electrode was 1/2 circumference), and other configuration parameters were the same as those of the hollow wire electrode used in example 1, and other experimental conditions were the same as those of example 1. It is observed that the extruded spinning solution has a tendency of sliding downwards under the action of gravity, and the excited jet flow has a phenomenon that part of the jet flow is bent upwards after downwards, so that part of the fibers are broken and not completely collected, and the production efficiency of the nano fibers in example 5 is 7g/min.
Comparative example 1
In comparative example 1, the same hollow wire electrode as in example 1 was used, and only the liquid supply rate was adjusted to 10mL/min per meter of the hollow wire electrode, and the other experimental conditions were the same as in example 1. In the electrostatic spinning process, the problem of obvious excessive solution is found, a large amount of solution is gathered at the lower half part of a linear electrode, liquid drops are formed to generate jet flow, the nanofiber is excited downwards, and the phenomena of obvious filament floating and filament breakage can be observed. And the excessive accumulation of the spinning solution can absorb moisture in the air, so that the viscosity of the spinning solution is increased, the splashing problem of high-viscosity solution is generated after the excitation, and the quality and the uniformity of the product are greatly influenced.
Comparative example 1 the nanofiber production efficiency was 8g/min.
Comparative example 2
In comparative example 2, the same hollow wire electrode as in example 1 was used, and only the liquid supply rate was adjusted to 3mL/min per meter of the hollow wire electrode, and other experimental conditions were the same as in example 1. In the electrostatic spinning process, the phenomenon of insufficient liquid supply of the spinning solution is observed, the spinning solution is automatically stopped due to insufficient spinning solution after jet flow is excited for a period of time, the spinning efficiency is obviously influenced, the yield of the nano fibers is reduced, and the phenomenon of partial spinning solution solidification is easy to occur, so that the continuous production is not facilitated.
Comparative example 2 the nanofiber production efficiency was 5g/min.
The experimental conditions for examples 1-5 and comparative examples 1-2 described above were varied, as shown in Table 1 below:
TABLE 1
Effect example 1 production efficiency test
Test object(s): nanofibers were produced using the electrospinning process of example 1 and comparative example 1.
The test method comprises the following steps:
1. using the same circular sampler (sampling area S m) 2 ) Cutting 5 samples at different random positions on the prepared nanofiber membrane, weighing respectively, calculating the mass average value and recording as A 1 g；
2. Using the same circular sampler (sampling area S m) 2 ) Cutting 5 samples at different random positions on the prepared nanofiber membrane, weighing respectively, calculating the mass average value and recording as A 2 g；
3. Calculating the production efficiency (alpha g/m) according to the formula 2 )
α＝(A 2 -A 1 )/S
And (3) testing results: as shown in table 2 below.
TABLE 2
Remarking: the flying phenomenon and the continuous production stability effect in table 2 above can be observed by naked eyes during the electrospinning process.
The inventor is researched and found through a large amount of experiments:
1. the distance between through holes arranged on the hollow wire electrode cannot be too close, because the spinning solution can carry a large amount of positive charges to fly in the spinning cabin after being excited, if two excitation point positions (through holes) are too close, two bundles of nanofiber solutions can generate mutual exclusion influence, so that abnormal stretching is caused, and the product quality is influenced; if the distance is too long, the yield of the wire electrode on the unit length is too low, the number of excitation points is small, and the spinning efficiency is reduced.
2. The position of the through hole in the hollow wire electrode is specified. For example, when the distance between any two adjacent through holes i on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode on the inner layer hollow tube is 1/4 circumference (i.e. the included angle between the through holes i is 90 °), the distance between any two adjacent through holes ii on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode on the outer layer metal layer is 1/4 circumference (i.e. the included angle between the through holes ii is 90 °), and the through holes i and the through holes ii completely overlap, such advantages are obtained: the problem of mutual charge interference after the solution on the two sides is excited can be effectively avoided, the solution is respectively stretched towards the two sides to form the nanofibers after being stretched by the stabilizing section, and the distance between the two bundles of nanofibers can not influence the normal stretching of other nanofibers due to the fact that the positive charges carried by the nanofibers can not be influenced.
3. The liquid supply speed of the spinning solution needs to be matched with the length of the hollow line electrode, and the hollow line electrode matched with a specific liquid supply speed can ensure that equipment is in a continuous and stable excitation state, and the solution is not excessive. Specifically, the method comprises the following steps:
in the electrostatic spinning process, the spinning solution is only contacted with air at the through hole, but is quickly excited under the action of high voltage, so that the problem of solution water absorption and deterioration is not easy to occur. Meanwhile, only the through holes in the half-circumference side surface of the inner hollow tube and the half-side surface of the outer metal layer effectively inhibit the process that the solution is gathered into liquid drops below the on-line electrode under the action of gravity so as to be excited, so that the solution can be excited only in the half part of the on-line electrode, the problems of filament floating and filament breakage caused by downward excitation of the nano fibers are effectively inhibited, and the stability of a nano fiber product is improved. Even if a small amount of solution slowly flows to the lower half part of the wire electrode, the solute is gradually condensed and separated out, a layer of polymer film is formed on the lower half part of the wire electrode and is coated on the lower half part of the wire electrode, so that the solution is more difficult to gather into drops to form jet flow, the excitation difficulty is improved, and the excitation of the solution on the lower half part of the wire electrode is further inhibited;
therefore, compared with the traditional blade coating method, the continuous excitation effect of the electrostatic spinning method for the hollow line electrode can be obviously improved, the aims of supplying more liquid and exciting more liquid can be realized only by adjusting proper liquid supply parameters, and the utilization rate of raw materials is obviously improved.
Claims (10)
1. A hollow wire electrode is characterized by comprising an inner layer hollow tube and an outer layer metal layer;
the semi-circumferential side surface of the inner layer hollow tube is a side surface with a central angle of 180 degrees corresponding to a tangential plane in the circumferential direction of the inner layer hollow tube; the semi-circumferential side surface of the outer metal layer is a side surface with a central angle of 180 degrees corresponding to a circumferential tangent plane of the outer metal layer; the through hole I and the through hole II form a continuous through hole;
(1) The through hole I satisfies the following conditions:
the distance between any two adjacent through holes I on the same section in the extension line direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes I on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5-1/2 of the circumference;
(2) The through hole II satisfies the following conditions:
the distance between any two adjacent through holes II on the same section in the extension direction of the hollow wire electrode is 2-8cm;
the distance between any two adjacent through holes II on the same section in the circumferential direction of the hollow wire electrode is 1/5-1/2 circumference;
the circumferential direction of the hollow wire electrode is a direction perpendicular to the extension direction of the hollow wire electrode.
2. A hollow wire electrode in accordance with claim 1,
the distance between any two adjacent through holes I on the same section in the extension direction of the hollow wire electrode is 3-7cm, such as 4cm, 5cm or 6cm;
and/or the distance between any two adjacent through holes II on the same section in the extension direction of the hollow wire electrode is 3-7cm, such as 4cm, 5cm or 6cm.
3. The hollow wire electrode of claim 1,
the distance between any two adjacent through holes I on the same section of the hollow wire electrode in the circumferential direction of the hollow wire electrode is 1/5-1/3 of the circumference, such as 1/4 of the circumference;
and/or the distance between any two adjacent through holes II on the same section in the circumferential direction of the hollow wire electrode is 1/5-1/3 circumference, such as 1/4 circumference;
and/or the through holes I and the through holes II are in one-to-one correspondence, and the one-to-one correspondence means that the through holes I and the through holes II can be completely overlapped in a corresponding manner.
4. A hollow wire electrode in accordance with claim 1, wherein the outer diameter of the inner hollow tube is 2-5mm, such as 3mm or 4mm;
and/or the inner diameter of the inner hollow tube is 1-4mm, such as 2mm or 3mm.
5. The hollow wire electrode of claim 1, wherein the inner hollow tube is made of ptfe;
and/or the thickness of the outer metal layer is 0.5-1mm, for example 0.5mm.
6. An electrospinning device, comprising the hollow-wire electrode of any one of claims 1 to 5.
7. The electrospinning device according to claim 6, wherein the hollow wire electrode is horizontally placed in the electrospinning device such that a side provided with the through-holes faces upward, and the "upward" is a direction away from the ground.
8. An electrospinning process, characterized in that a spinning solution is passed into a hollow-wire electrode according to any one of claims 1 to 5, or into a hollow-wire electrode in an electrospinning apparatus according to claim 6 or 7;
wherein the liquid supply speed of the spinning solution is 3.5-9.5mL/min per meter of hollow wire electrode;
when the spinning solution is introduced into the hollow wire electrode, the flowing direction of the spinning solution is the extending direction of the hollow wire electrode;
when the spinning solution is introduced into the hollow wire electrode in the electrostatic spinning device as described above, the flow direction of the spinning solution is opposite to the direction of the current introduced into the hollow wire electrode.
9. Electrospinning according to claim 8, wherein the liquid supply rate is 4-8mL/min per meter of hollow wire electrode, such as 5mL/min per meter of hollow wire electrode, 6mL/min per meter of hollow wire electrode or 7mL/min per meter of hollow wire electrode.
10. A hollow-wire electrode according to any one of claims 1 to 5, or the use of an electrospinning apparatus according to claim 6 or claim 7 in an electrospinning process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211321383.3A CN115584563A (en) | 2022-10-26 | 2022-10-26 | Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211321383.3A CN115584563A (en) | 2022-10-26 | 2022-10-26 | Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115584563A true CN115584563A (en) | 2023-01-10 |
Family
ID=84782265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211321383.3A Pending CN115584563A (en) | 2022-10-26 | 2022-10-26 | Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115584563A (en) |
-
2022
- 2022-10-26 CN CN202211321383.3A patent/CN115584563A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Niu et al. | Needleless electrospinning: developments and performances | |
| SalehHudin et al. | Multiple-jet electrospinning methods for nanofiber processing: A review | |
| EP1637637B1 (en) | Method and apparatus of producing fibrous aggregate | |
| RU2497983C2 (en) | Method and apparatus for producing fine fibres | |
| JP4567561B2 (en) | Fiber assembly manufacturing method and fiber assembly manufacturing apparatus | |
| KR20050031073A (en) | Electrospinning apparatus equipped with rotating pin-bundle spinneret | |
| CN203583025U (en) | Electrostatic spinning device | |
| KR20100077913A (en) | Centrifugal electric spinning apparatus | |
| CN102650095A (en) | Continuous mass production method and continuous mass production equipment for electrospun nanofiber membranes | |
| Yan et al. | Curved convex slot: an effective needleless electrospinning spinneret | |
| RU2614393C2 (en) | Combination die for production of nanofibrous and microfibrous materials | |
| CN112430858B (en) | Electrostatic spinning equipment | |
| CN115584563A (en) | Hollow line electrode, electrostatic spinning device, application and electrostatic spinning method | |
| CN202131466U (en) | Equipment for continuous and bulk production of electrospun nano-fiber membrane | |
| CN211947308U (en) | Bubble electrostatic spinning device for preparing nanofiber yarn | |
| CN108411384A (en) | A kind of suitable gravity cylindrical static electric spinning device and method | |
| KR100781773B1 (en) | Electrospinning apparatus equipped with rotating pin-bundle spinneret and method for producing fiber using the same | |
| CN215050876U (en) | Miniature solution wet spinning machine | |
| CN210856421U (en) | Centrifugal electrostatic spinning device | |
| KR20100070203A (en) | Making apparatus and method of fiber aggregate composed of nanofibers using vertical flow and centrifugal force | |
| KR101466287B1 (en) | Apparatus for manufacturing of nano fiber | |
| KR20120077437A (en) | Electrospinning device | |
| CN114481341B (en) | Spray head for linear electrode solution electrostatic spinning and use method thereof | |
| CN212611016U (en) | Line-inspection type film-forming homogenizing electrostatic spinning device | |
| CN113106560B (en) | Device and method for generating polymer nano-fibers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |