CN115747976A

CN115747976A - Power-on-adjustable polymer nanofiber production device

Info

Publication number: CN115747976A
Application number: CN202211155121.4A
Authority: CN
Inventors: 于淼
Original assignee: Qingdao Zhongke Kaier Technology Co ltd
Current assignee: Qingdao Zhongke Kaier Technology Co ltd
Priority date: 2021-02-23
Filing date: 2021-04-06
Publication date: 2023-03-07
Also published as: CN113106560A; CN113106560B

Abstract

The invention relates to a high-molecular nanofiber production device with adjustable electrification, which comprises a liquid tank, a receiving device, a plurality of first electrodes and a plurality of second electrodes, wherein the first electrodes and the second electrodes form potential difference; wherein the second electrode is used for dipping the polymer solution and/or spraying the polymer solution to a receiving device in an intermittent electrifying mode; when the second electrode moves into the polymer solution in the liquid tank, the second electrode is powered off; and electrifying the second electrode when the second electrode is completely or partially removed from the polymer solution in the liquid groove. Through the setting of intermittent type formula circular telegram, outage when dipping in polymer solution is favorable to polymer solution even adhesion on the second electrode.

Description

Power on adjustable polymer nanofiber apparatus for producing

The basis of this divisional application was a patent application having an application number of 202110365359.9, an application date of 2021, 4/6/2021, entitled "an apparatus and method for producing polymeric nanofibers" claiming priority to the patent application having an application number of 202110213311.6, the priority date of which is 2021, 2/23/2021.

Technical Field

The invention relates to the technical field of nanofiber material preparation, in particular to a high-molecular nanofiber production device with adjustable electrification.

Background

Electrospinning is a process of spinning with polymer solutions under high-voltage electrostatics. The electrostatic spinning can prepare fibers with the diameter of dozens to hundreds of nanometers, and the product has high porosity, large specific surface area, diversified components and uniform diameter distribution and has high application value in the fields of biomedicine, environmental engineering, textile and the like.

The principle of electrostatic spinning is as follows: the polymer solution or the melt is charged with high-voltage static electricity of thousands to ten thousand volts, and the charged polymer liquid drop is accelerated at the Taylor cone vertex of the capillary under the action of the electric field force. When the force of the electric field is sufficiently large, the polymer droplets overcome the surface tension to form jet streams. The solvent evaporates or solidifies during the trickle-spray process and eventually lands on the receiver, forming a fiber mat that resembles a nonwoven.

The electrostatic spinning device mainly comprises a propelling pump, an injector, a high-voltage power supply and a receiving device. The positive pole and the negative pole of the high-voltage power supply are respectively connected with the syringe needle and the receiving device, and the receiving device is diversified in form and can be a static plane, a roller rotating at a high speed or a disk. The parameter setting and environmental conditions of spinning are of great importance to the influence of the spinning process.

At present, the high-voltage electrostatic spinning forms mainly include a needle head type, a line electrode coating type and the like. The process of spinning by adopting the needle type electrostatic spinning device comprises the following steps: the solution passes through a needle with positive high voltage under the assistance of a propelling pump and the like, the receiving end is grounded or connected with negative high voltage, the solution forms a Taylor cone at the tip of the needle under the action of an electric field, and a fiber filament is obtained by extending from the tip of the cone. However, the needle type electrostatic spinning device for spinning has the defects of nonuniform spatial distribution of spinning, troublesome installation/cleaning of needles, easy blockage of needles, easy dropping of liquid in the spinning process and the like. The process of spinning by adopting the line electrode liquid coating type electrostatic spinning device comprises the following steps: the solution is smeared on a wire electrode with positive high voltage through a motion mechanism, a receiving end is grounded or connected with negative high voltage, and the solution is spun under the action of an electric field. However, the wire electrode liquid coating type electrostatic spinning device has the defects of low liquid coating efficiency, uneven liquid coating, troublesome cleaning of the liquid coating device, low efficiency of a moving mechanism and the like. Therefore, how to provide an electrostatic spinning device with high spinning efficiency, uniform spinning, convenient liquid supply and convenient cleaning is a technical problem which is urgently needed to be solved at present.

However, there are many electrode forms and coating methods, which have more or less some disadvantages.

For example, patent document CN111005077A discloses a core-string-type multi-needle electrospinning device, which further includes:

the electrostatic spinning nozzle and the liquid supply device are communicated with the solution channel through a guide pipe;

the anode of the high-voltage power supply is connected with the electrode plate, and the cathode of the high-voltage power supply is grounded; and a collecting plate grounded for mounting the substrate. The electrostatic spinning nozzle is a shell made of insulating materials, a solution channel is arranged in the shell, and a plurality of nozzle holes perpendicular to the solution channel are formed in the shell; the spinning injection device comprises an electrode plate and a discharge needle arranged on the electrode plate, and the discharge needle is provided with a needle point; the shell is arranged on the electrode plate, and the discharge needle is connected with the inner wall of the nozzle hole in a clearance fit manner.

In this patent, the electrode syringe needle of syringe needle formula blocks up easily, is generating the easy dropping liquid of polymer nanofiber in-process, and requires highly to the syringe needle, and there are spinning spatial distribution inhomogeneous, syringe needle installation/wash trouble, syringe needle easily blockked up, spinning process shortcoming such as the easy dropping liquid.

For example, patent document CN104593440A discloses an electrostatic spinning device for mass production of polymer nanofibers, which is characterized by comprising a liquid storage tank for storing a spinning solution or melt, wherein a plurality of metal wires are arranged in the liquid storage tank, the metal wires are connected with a metal wire driving mechanism and can move upwards to a position above the liquid level of the spinning solution or melt under the driving of the metal wire driving mechanism and descend into the spinning solution or melt from the position, the metal wires are connected with the positive electrode of a high-voltage electrostatic generator, the negative electrode of the high-voltage electrostatic generator is connected with a fibrofelt receiving device, and the fibrofelt receiving device is located right above the liquid storage tank. The continuous small liquid drops are formed by the spinning solution on the surface of the metal wire due to the unstable Rayleigh-Plateau phenomenon, and a large amount of jet flow is generated under the action of a high-voltage electrostatic field, so that the defects of easy blockage, difficult cleaning, low efficiency and the like of the traditional spinning nozzle are overcome. In this patent, the drive mechanisms at the two ends of the wire are not limited, and are generally metal devices. During the process of obtaining the silk solution, the driving device inevitably contacts and sticks to the silk solution, and the silk solution is thicker and thicker in a long term. Therefore, the driving equipment needs to clean the solidified silk solution regularly, which affects the production efficiency and also causes waste of the silk solution. Moreover, the metal equipment can be influenced by the high-voltage electric field during operation to generate different small electric fields, so that the spinning process of the silk solutions at two ends of the metal wire is interfered, the spinning effect of the corresponding position is poor, and the spinning density is uneven. Under the condition that the metal wire is provided with high voltage electricity, the driving metal wire is risky to move, the risk of sparks and further the risk of fire are caused due to the fact that point discharge is easy to occur in the slender geometric state of the driving metal wire, and the technical problem that the mechanism of the driving metal wire is isolated from the metal wire provided with the high voltage electricity is also solved.

In the prior art, the problem of how to improve the density uniformity of weaving through the parameter matching of the movement of metal wires, the concentration of mucus and high voltage is not solved.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, as the inventor studies a lot of documents and patents while making the present invention, but the space is not detailed to list all the details and contents, however, this invention doesn't have these prior art features, but this invention has all the features of the prior art, and the applicant reserves the right to add related prior art in the background art.

Disclosure of Invention

In view of the shortcomings of the prior art, the present invention provides an apparatus for generating polymeric nanofibers, the apparatus at least comprises a liquid bath, a receiving device, and a plurality of first electrodes and a plurality of second electrodes forming a potential difference, a substrate in the receiving device passes through an electric field between the plurality of first electrodes and the plurality of second electrodes, or is arranged in the electric field, the liquid bath reciprocates in a manner of moving relative to at least one of the second electrodes, and during the process of contacting and/or separating the second electrodes with a polymer solution in the liquid bath, the polymer solution dipped by the second electrodes is sprayed toward the substrate based on the electric field to form a nanofiber layer.

Preferably, the second electrode and the liquid groove reciprocate in a mode of opposite movement or departing movement.

Preferably, the at least one moving assembly for adjusting the position of the second electrode is constituted by at least one non-electromagnetic member less subject to electric field disturbances, so that the moving assembly isolates the driving mechanism providing the driving force for the moving assembly in a region less subject to electric field disturbances.

Preferably, the moving assembly is disposed around an end of the liquid bath in such a manner that the second electrode reciprocates in a vertical direction, and the liquid bath is raised or lowered in the vertical direction by at least one lifting mechanism so as to move in a vertical direction relative to the stationary or moving second electrode.

Preferably, the moving assembly is arranged around the end of the liquid bath in such a manner that the second electrode reciprocates in a non-vertical direction, and the liquid bath is raised or lowered by at least one lifting mechanism at a frequency of motion matching the frequency of reciprocation of the second electrode, so that the second electrode contacts and dips the polymer solution in the liquid bath.

Preferably, the liquid tank is an independent liquid tank or comprises at least two independent liquid dividing tanks, and the plurality of second electrodes dip the polymer solution in a mode of relative motion with the liquid tank or the liquid dividing tanks.

Preferably, a plurality of second electrodes dip the polymer solution in the liquid tank or different liquid dividing tanks in an alternating motion mode respectively; and/or dipping the polymer solution by a plurality of second electrodes in at least one liquid dividing groove in an alternating motion mode.

Preferably, in the case where the second electrode moves simultaneously with the liquid bath, the second electrode moves toward the liquid bath so that the second electrode comes into contact with the polymer solution of the liquid bath, and the second electrode moves away from the liquid bath so that the second electrode is separated from the polymer solution of the liquid bath.

Preferably, the second electrode begins spinning when all or part of the polymeric solution is exposed.

The present invention also provides a method of producing polymeric nanofibers, the method at least comprising: passing a substrate in a receiving device through an electric field between a number of first electrodes and a number of second electrodes, or the substrate being disposed within the electric field, the method further comprising: the liquid groove moves in a reciprocating mode relative to at least one second electrode, and in the process that the second electrode is in contact with and/or separated from the polymer solution in the liquid groove, the polymer solution dipped by the second electrode is sprayed to the base material based on the electric field action to form a nanofiber layer.

The invention has the beneficial technical effects that:

the principle of the invention is simple, the implementation is convenient, the second electrode is convenient to dip the polymer solution, and the formed polymer nano-fiber has reliable and uniform quality, large operable range, wide specific range and standard technical operation process.

The surface of the second electrode is conveniently coated with the polymer solution by utilizing the surface tension of the liquid.

The solution smeared on the surface of the second electrode is more uniform.

Any part of the second electrode dipped with the polymer solution can be spun, and the spinning efficiency is high.

The part dipped with the polymer solution by the second electrode is spun simultaneously, and the collection by the receiving device is more uniform.

No other device interference exists in the spinning process, and the loss of the polymer solution is reduced.

Through the setting of non-electromagnetic's removal subassembly, keep apart the lower environment of formation electric field interference of the surrounding environment that polymer solution exposes, set up electric power direct drive's metal equipment in the peripheral environment of polymer solution's cistern, make other electric field interference that polymer solution and electron device on every side received minimize, further reduced the electric field influence of the equipment at second electrode both ends to near polymer solution, make the textile density at the edge of textile fabric layer more even, and better quality, also reduced the waste phenomenon of textile industry to unusable edge material, environmental protection more.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for producing polymer nanofibers according to the present invention;

FIG. 2 is a partial structural view of the apparatus for producing polymer nanofibers according to the present invention;

FIG. 3 is a schematic diagram of a top view of a liquid storage tank of the apparatus for producing polymer nanofibers according to the present invention;

FIG. 4 is a schematic diagram of one of the side view angles of the liquid storage tank of the device for producing polymeric nanofibers according to the present invention;

FIG. 5 is a schematic structural diagram of one embodiment of a reservoir of the device for producing polymer nanofibers according to the present invention;

FIG. 6 is a schematic structural view of one preferred embodiment of the relative movement of the second electrode;

FIG. 7 is a schematic structural view of another preferred embodiment of the relative movement of the second electrode;

FIG. 8 is a schematic diagram of the structure of one of the preferred embodiments of the relative movement of the fluid bath;

FIG. 9 is a schematic structural view of another preferred embodiment of the relative movement of the fluid bath;

FIG. 10 is a schematic diagram of the structure of one of the preferred embodiments in which the second electrode is alternately spun;

FIG. 11 is a schematic structural diagram of one preferred embodiment of the second electrode and the liquid bath simultaneously making relative movement;

FIG. 12 is a schematic structural diagram of one preferred embodiment of the second electrode and the liquid bath simultaneously making relative movement.

List of reference numerals

1: an electrode chamber; 2: a liquid bath; 3: a first electrode; 4: a second electrode; 5: a polymer solution; 7: a receiving device; 11: a lifting mechanism; 41: a first moving assembly; 42: a second moving assembly; 61: a first conveying device; 62: a second conveying device; 91: a first pulley; 92: a second pulley; 93: a connecting belt; 94: a drive mechanism; 95: a connecting assembly; a: spinning state; b: taking the liquid state.

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

The invention provides a device and a method for generating polymer nano fibers.

The second electrode in the present invention is made of conductive metal, and includes any device made of metal, such as a wire, a metal sheet, a metal mesh, a metal cage, and the like.

Preferably, the second electrode is arranged in a flat structure in the horizontal plane, so that the aggregation of the polymer in the second electrode can be avoided, and the polymer solution can be uniformly dispersed at each position of the second electrode. Upon energization, the polymer solution at the second electrode is emitted from a high potential to a low potential, intercepted by the substrate in the receiving device and deposited on the substrate to form nanofibers.

Example 1

As shown in fig. 1 to 5, an apparatus for generating polymer nanofibers at least comprises a liquid bath 2, a receiving device 7, and a plurality of first electrodes 3 and a plurality of second electrodes 4 for forming a potential difference.

The receiving device 7 comprises a substrate and several transport assemblies. As shown in fig. 1, the conveyor assemblies at both ends of the substrate include a first conveyor assembly 61 and a second conveyor assembly 62. For example, both ends of the base material are controlled by at least two pairs of unpowered rollers and are movably conveyed so as to receive the nanofibers ejected from the second electrode to form a nanofiber layer.

The moving state of the substrate includes a stationary time, a moving speed, a moving time, and other parameters related to the movement.

Preferably, several first electrodes 3 are arranged within the electrode compartment 1. The arrangement of the first electrodes 3 is not limited, and the first electrodes may be arranged in a regular array or an irregular array. The receiving means are arranged between the electric fields of the first electrodes 3 and the second electrodes 4. The direction of decrease in the electric potential of the electric field between the first electrode 3 and the second electrode 4 is not limited, and the electric potential of the first electrode may be higher than that of the second electrode, or the electric potential of the second electrode may be higher than that of the first electrode.

Several second electrodes 4 are subjected to a relative movement with respect to the fluid bath 2 by means of at least one moving component. As shown in fig. 2, a first moving member 41 and a second moving member 42 are respectively disposed at both ends of the second electrode. Under the condition that the first electrode and the second electrode form a potential difference, the polymer solution on the second electrode is sprayed from the second electrode to the substrate based on the action of the high-voltage electric field to form a nanofiber layer. When the moving assembly controls the second electrode to move horizontally, the polymer solution 5 on the second electrode 4 does not flow obliquely due to vibration during movement due to smooth movement.

In the present invention, the second electrode is first immersed in the polymer solution in the power-off state. When the second electrode leaves the polymer solution, or when all or part of the second electrode dipped with the polymer solution is exposed out of the polymer solution in the liquid tank, the electricity is electrified, and the polymer solution attached to the surface of the second electrode is sprayed to the substrate.

In the prior art, the moving components at both ends of the second electrode are driving devices arranged close to the electrode, such as metal-containing driving devices directly driven by electric power. Furthermore, the apparatus for susceptibility of the electric field surrounding the second electrode comprises at least: electrical components, motors, and the like. The second electrode and the polymer solution in the liquid tank for containing the polymer solution are electrified, and the generated electric field can cause the electric appliance element to generate tiny deviation, and the measured value has deviation or operation failure, so that the service life is short.

For example, the two ends of the second electrode are fixed by a metal fixing component, and the movement of the second electrode is controlled by a motor and a metal rod. The polymer solution is formed into woven nanofibers based on the action of a high voltage electric field, and the voltage between the first and second electrodes is up to several hundred thousand volts. The moving assembly and the polymer solution in the liquid bath are susceptible to interference and influence of high voltage electricity. Even if the voltage of the moving assembly made of the metal cannot reach hundreds of thousands of volts, the voltage of the moving assembly can also influence the polymer solutions at the two ends of the second electrode, so that the polymer solutions slightly flow under the influence of the electric field between the moving assembly and the second electrode, the polymer solutions close to the moving assembly at the two ends of the second electrode obviously cannot be uniform due to the slight flow, and the density of the nano fibers formed by the polymer solutions at the two ends of the second electrode is further influenced to be non-uniform. When the moving component also enters the polymer solution, the electric field of the moving component can also affect the uneven concentration distribution of the polymer, so that the polymer concentration at two ends of the second electrode is uneven. Therefore, the edges at both ends of the nanofiber fabric always have the phenomena of uneven density and poor quality.

Moreover, a plurality of high-voltage devices are distributed on the devices around the polymer solution, the moving high-voltage electrodes form point discharge high-risk components, and the polymer solution is easy to burn due to friction spark of the devices, so that the difficulty of safety control of textile production is improved, and the cost of safety control is increased.

Based on the defect, the moving components at two ends of the second electrode are non-electromagnetic moving components. I.e. the moving component is not a metallic device or an electromagnetic device affected by an electric field. The specific mechanical structure of the non-electromagnetic moving component is not limited, and may be a pulley structure, or may be a moving machine directly driven by non-electric power, as long as it has a moving function. As shown in fig. 6-12, the moving assembly of the present invention is preferably a pulley assembly. Two loose pulley assembly pass through the insulating rope body and fix the both ends of second electrode to two loose pulley assembly stretch the second electrode for tight state, make the second electrode at the straight extension of horizontal plane, then the second electrode is when dipping in the polymer solution, and the polymer solution that dips in is difficult to flow because the second electrode slope.

Preferably, the pulleys in the pulley assembly may also be non-metallic pulleys. The pulley assembly is connected with the roller assembly through a connecting belt and controls the relative movement of the pulley assembly and the second electrode.

Preferably, the pulley assembly includes a first pulley 91 and a second pulley 92. The first pulley 91 is fixedly connected with the end of the second electrode, and the second pulley 92 is connected with the first pulley 91 through a rope body or in a winding manner. The second pulley 92 is connected to at least one drive mechanism 94 by at least one connection assembly 95 and a connecting belt 93. The drive mechanism 94 is disposed at a position remote from the bath.

The arrangement is such that the moving components around the second electrode do not have an electric field disturbance to the polymer solution, and the drive mechanism 94 with possible electric field disturbance is located away from the polymer solution. Therefore, the moving assembly of the invention can not generate the interference of uneven distribution and uneven density of the polymer solution on the second electrode, so that the polymer solution on the surface of the second electrode is evenly distributed, the density of fibers formed at two ends of the base material is more even, and the quality of textile fabrics is higher.

The arrangement of the non-electromagnetic moving component in the invention has the advantage that the environment around the polymer solution is isolated into a non-electromagnetic equipment area by the non-electromagnetic component, so that the polymer can only be influenced by the electric field between the first electrode and the second electrode, and the polymer solution spraying effect is better. The electric equipment around the polymer solution is reduced, the production safety degree is improved, the equipment response for controlling the production safety is reduced, and the safety production control cost of the textile space is greatly reduced.

In the spinning process, the completion time of one-time spinning is no longer than twenty seconds, and therefore the moving time control that the moving assembly is influenced by electromagnetism and is more favorable to the spinning of the second electrode is reduced, the polymer solution of the second electrode can be accurately sprayed on the base material of the receiving device according to the preset distance and time, the density of the formed nanofiber layer is more consistent, namely, the nanofiber layer is more uniform, and the quality is better.

The prior art generally adopts an electric pump to supplement the polymer solution in the liquid tank, and has the defect that insulation treatment needs to be carried out between a motor and a pump head, for example, connection is carried out through a coupling made of an insulating material. If the motor and the pump head are not processed, all components in contact with the solution are electrified in the liquid supply process, so that danger is easy to occur, and the service life of the liquid supply motor is influenced.

Preferably, the polymer solution in the liquid tank is supplemented by a pneumatic pump, so that the high voltage of the second electrode and the liquid tank is isolated from the external environment, and the high voltage influence of the high voltage of the liquid tank on the external environment is further reduced.

In particular, at least one second electrode 4 dips the polymer solution in a relative movement to the tank 2 and, based on the effect of the electric field, ejects the filaments towards the receiving means 7 to form a layer of nanofibres. In the case where the second electrode is horizontally disposed, the polymer solution can be more uniformly irradiated to the base material, thereby making the density of the nanofiber layer formed more uniform.

Preferably, the second electrode 4 is used for dipping the polymer solution in the energized state. The liquid bath 2 is in an intermittently energized state based on its contact with the relative movement of the second electrode 4.

For example, the fluid bath 2 is energized when the second electrode 4 is moved into contact with the polymer solution in the fluid bath 2. When the second electrode 4 is moved out of the polymer solution in the fluid bath 2, the fluid bath 2 is powered off.

According to the method for dipping the liquid by the second electrode, only when the second electrode enters the liquid tank below and dips the liquid, the liquid in the liquid tank is electrified to generate an electric field, so that the influence of the liquid tank on surrounding electronic devices is reduced.

Preferably, the second electrode 4 is intermittently energized to dip and/or spray the polymer solution into the receiving means 7.

For example, when the second electrode 4 moves into the polymer solution in the fluid bath 2, the second electrode 4 is de-energized. The second electrode 4 is energized when the second electrode 4 is removed completely or partly from the polymer solution in the fluid bath 2.

The intermittent energization has the advantage that the energization is cut off when the polymer solution is dipped, which is beneficial to the uniform attachment of the polymer solution on the second electrode. The second electrode is electrified when reaching the preset distance range from the receiving device, so that the polymer solution on the second electrode can be sprayed in a similar state and at a similar density when reaching the base material, and the base material and the spinning yarn form a nanofiber layer with uniform density.

In general, the second electrode is made of metal, and the operating voltage is generally 5 to 7 ten thousand volts. The width of the substrate is usually 0.5 to 2 meters. The length of the second electrode is different according to the width of the base material. Preferably, the length of the second electrode is about 0.5 m greater than the substrate width. The second electrode is a metal rod or a metal wire with the voltage as high as hundreds of thousands of volts, and the polymer solution on the surface of the second electrode can be successfully dipped on the second electrode by overcoming the tension and the influence of the high voltage on the surface of the polymer solution and the action of gravity in the dipping process. Therefore, the diameter of the second electrode and the viscosity range of the polymer solution can influence the distribution effect of the polymer solution obtained by dipping the second electrode.

Preferably, in the case of spinning by lifting and lowering 10 second electrodes, the translation speed of the base material is about 3 to 5m/min.

The surface of the second electrode is smooth and clean, and certain tension strength requirements are met. And tensioning the metal wire to ensure that the whole second electrode is kept at the same horizontal plane to the maximum extent in the process of dipping the liquid.

The macromolecular compound in the composition of the polymer solution of the present invention is preferably: examples of the binder include polyethylene terephthalate, polyvinylidene chloride, polyurethane, polyethylene, polycarbonate, polyvinyl pyrrolidone, polyethylene terephthalate, polyvinylidene chloride, polyurethane, polylactone, polyethylene glycol, polyvinyl acetate, polyethylene oxide, chitosan, water-soluble chitosan, sodium alginate, polyvinylidene fluoride, polyurethane, polyacrylonitrile, polymethyl methacrylate, polylactic acid, polyamide, polyimide, polyaramide, polybenzimidazole, polyethylene terephthalate, polypropylene, polyaniline, polyethylene oxide, polyethylene naphthalate, polybutylene terephthalate, styrene-butadiene rubber, polystyrene, polyvinyl chloride, polyvinyl alcohol, polyvinyl butene, and copolymers or derivatives thereof, any one or a combination of at least two of polystyrene, polyacrylonitrile, polyvinylidene fluoride, cellulose acetate, polysulfone, or polyether sulfone, cellulose diacetate, any one or a combination of at least two of N, N-dimethylformamide, N-dimethylacetamide, acetone, methyl ethyl ketone, or dimethyl sulfoxide, and the like.

Among the components of the polymer solution of the present invention, the spinning solvent is preferably: tetrahydrofuran, THF, DMF, dichloromethane, ethanol, trichloroacetic acid, formic acid, acetone, water, acid ester, acetic acid, etc.

The polymer solution has higher viscosity, and the second electrode is linear, so that the polymer solution attached quantity on the second electrode is not aggregated and does not meet the condition of liquid aggregation and dripping.

The second electrode is charged, so that the polymer solution attached to the second electrode is also charged, and the charged molecules in the polymer solution in the liquid tank are acted by the combined action of gravity and high-voltage electric field force, so that the spinning fibers are upwards deposited, and the liquid attached to the second electrode does not drop downwards. Because the second electrode is transversely arranged, each point on the second electrode simultaneously spins, and the uniformity of transverse spinning is improved. Furthermore, the uniformity of the spinning in the longitudinal direction is ensured by setting a suitable lifting frequency and a suitable moving speed of the base material. The uniformity can be tested by electron microscope test, online air permeability detection and the like, and the specific results are shown in the porosity, the filtration efficiency and the service life of the product.

Preferably, several second electrodes 4 are spun towards the receiving means 7 in an alternating motion.

Alternatively, several second electrodes 4 are spun towards the receiving means 7 in a synchronized motion.

For example, as shown in fig. 10, the two second electrodes are alternately moved. And one second electrode performs the electrifying spinning work in the time period when the other second electrode is powered off. The two second electrodes move alternately, so that the spinning efficiency can be obviously improved.

As shown in fig. 10, the liquid bath 2 includes at least two independent separate liquid-dividing baths. At least one second electrode 4 is arranged in the liquid separation tank. And the second electrodes dip the polymer solution in the independent liquid separating tanks in a mode of relative motion with the liquid separating tanks.

The liquid bath is arranged into a plurality of independent liquid separating baths, so that the second electrode can use independent polymer solution for spinning. When a certain second electrode is in failure or the spinning efficiency is low, the failed second electrode can be quickly found through the change of the capacity of the polymer solution and the change speed of the capacity, and the troubleshooting of the second electrode is facilitated.

Preferably, the plurality of second electrodes 4 dip and/or spin the polymer solution in the independent liquid separating tanks in an alternating motion manner, so that the spinning on the substrate is continuous, and the spinning efficiency on the substrate is improved.

Preferably, with second electrode 4 in a non-moving state, fluid bath 2 is moved relative to second electrode 4 such that second electrode 4 comes into contact with and dips into the polymer solution of fluid bath 2, or second electrode 4 is removed from the polymer solution of fluid bath 2.

As shown in fig. 8 to 12, the liquid tank 2 is provided with at least one elevating mechanism 11. The elevating mechanism is used to move the liquid bath in a smooth manner. The relative mounting position of the lifting mechanism 11 and the liquid tank is not limited, and the lifting mechanism may be mounted below the liquid tank or may be mounted on the side wall of the liquid tank. The lifting mechanism can make the liquid tank rise and fall in the vertical direction, and also can make the liquid tank move in the horizontal direction and rise and fall in the vertical direction. Preferably, the lifting mechanism can be a lifting motor, and also can be a combination of other mechanical devices with the same technical effect.

Preferably, in the case where the second electrode 4 is moved relatively to the liquid bath 2, the second electrode 4 is moved toward the liquid bath 2 so that the second electrode 4 moves into the polymer solution in the liquid bath 2. The second electrode 4 is moved away from the fluid bath 2 so that the second electrode 4 is removed from the polymer solution in the fluid bath 2. Preferably, the relative movement or the relative movement may be simultaneous or non-simultaneous.

As shown in fig. 11 and 12, the second electrode and the liquid bath are moved relatively at the same time. The second electrode 4 is moved towards the fluid reservoir 2 so that the second electrode can contact the polymer solution in the fluid reservoir. When spinning is required, the second electrode 4 moves away from the liquid bath 2 in the opposite direction, so that the second electrode is out of contact with the polymer solution.

The second electrode 4 and the liquid tank 2 move simultaneously, so that the distance and time required for dipping the polymer solution by the second electrode can be shortened, and the spinning efficiency is further improved.

Preferably, the second electrode 4 is moved relative to the fluid bath 2 with the fluid bath 2 in a non-moving state, such that the second electrode 4 moves into the polymer solution of the fluid bath 2. Or the second electrode 4 is removed from the polymer solution of the fluid bath 2. Only the second electrode is moved, the shaking of the solution in the liquid tank in the moving process can be avoided, the amount of the polymer solution obtained at each position of the second electrode is the same, the spinning time of each part of the second electrode is the same or similar, the density of the formed nanofiber layer is uniform, and the nanopores are uniformly distributed.

Example 2

This embodiment is a further description of embodiment 1, and repeated contents are not described again.

The invention also provides a method for producing polymer nanofibers, the method at least comprising:

the substrate in the receiving device is arranged in a mode of passing through an electric field between a plurality of first electrodes 3 and a plurality of second electrodes 4, or the substrate in the receiving device is arranged in the electric field, and at least one second electrode 4 is dipped into the polymer solution in a mode of moving relative to the liquid tank 2 and is spun to the receiving device 7 based on the action of the electric field to form the nanofiber layer.

The second electrode 4 dips the polymer solution by intermittently applying current.

When the second electrode 4 is moved into contact with the polymer solution in the fluid bath 2, the second electrode 4 is de-energized, and when the second electrode 4 is moved out of the polymer solution in the fluid bath 2, the second electrode 4 is energized.

Several second electrodes 4 perform the dipping and/or spinning of the polymer solution in an alternating motion.

The liquid tank 2 comprises at least two independent liquid separating tanks, and at least one second electrode 4 is arranged in each liquid separating tank. And a plurality of second electrodes 4 dip the polymer solution in the independent liquid separating tanks in a mode of relative motion with the liquid separating tanks.

The second electrodes 4 respectively dip and/or spin the polymer solution in the independent liquid dividing tanks in an alternating motion mode.

Under the condition that the second electrode 4 and the liquid tank 2 move relatively, the second electrode 4 and the liquid tank 2 move towards each other so that the second electrode 4 is in contact with the polymer solution in the liquid tank 2, and the second electrode 4 and the liquid tank 2 move away from each other so that the second electrode 4 is separated from the polymer solution in the liquid tank 2 and the spinning is carried out.

The second electrode 4 starts spinning when all or part of the polymerization solution is exposed.

The moving components at both ends of the second electrode 4 are non-electromagnetic moving components that do not generate electric field interference to the polymer solution.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The present specification encompasses multiple inventive concepts and the applicant reserves the right to submit divisional applications according to each inventive concept. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims

1. An electrified adjustable polymer nano-fiber production device, a liquid tank, a receiving device and a plurality of first electrodes and a plurality of second electrodes forming potential difference, wherein a base material in the receiving device passes through an electric field between the plurality of first electrodes and the plurality of second electrodes or is arranged in the electric field,

at least one second electrode dips the polymer solution in a mode of relative motion with the liquid groove and sprays the polymer solution to the receiving device based on the action of an electric field to form a nanofiber layer; wherein,

the second electrode is used for dipping and/or spinning the polymer solution to a receiving device in an intermittent electrifying mode;

when the second electrode moves into the polymer solution in the liquid tank, the second electrode is powered off; and when the second electrode is completely or partially removed from the polymer solution in the liquid tank, electrifying the second electrode.

2. The apparatus for producing polymer nanofibers with adjustable energization according to claim 1, wherein the liquid bath is in an intermittent energization state based on contact of the liquid bath with the second electrode in a relative motion;

the fluid bath is powered on when the second electrode moves into contact with the polymer solution in the fluid bath; and when the second electrode moves out of the polymer solution in the liquid tank, the liquid tank is powered off.

3. The apparatus for producing polymer nanofibers with adjustable power supply according to claim 1 or 2, wherein a driving mechanism of at least one moving assembly for adjusting the position of the second electrode is disposed at a position away from the liquid tank.

4. The apparatus for producing polymeric nanofibers, with adjustable energization according to any one of claims 1 to 3, wherein the moving assemblies at both ends of the second electrode are non-electromagnetic moving assemblies, so that the moving assemblies around the second electrode do not have electric field interference with the polymer solution, and the driving mechanism providing driving force for the moving assemblies is isolated in a region less affected by the electric field interference.

5. The apparatus for producing polymer nano-fibers with adjustable energization according to any one of claims 1 to 4, wherein the moving components at both ends of the second electrode are pulley components,

two pulley assemblies pass through the insulating rope body with the both ends of second electrode are fixed, and two pulley assemblies will the second electrode is tensile to the state of tautness, make the second electrode is straight to be stretched out in the horizontal plane, then the second electrode is when dipping in polymer solution, and the polymer solution that dips in is difficult for because the second electrode slope flows.

6. The device for producing high molecular nano fibers with adjustable electrification according to any one of claims 1 to 5, wherein the pulley assembly comprises a first pulley and a second pulley;

the first pulley is fixedly connected with the end of the second electrode, the second pulley is connected with the first pulley through a rope body or in a winding way,

the second pulley is connected with at least one driving mechanism through at least one connecting assembly and a connecting belt.

7. The apparatus for producing polymer nano-fibers with adjustable power supply according to any one of claims 1 to 6, wherein the liquid tank is an independent liquid tank or comprises at least two independent liquid dividing tanks,

and the second electrodes dip the polymer solution in a mode of relative motion with the liquid tank or the liquid separating tank respectively.

8. The apparatus for producing polymeric nanofibers according to any one of claims 1 to 7, wherein a plurality of the second electrodes dip the polymer solution in the liquid bath or different liquid separation baths in an alternating motion manner; and/or

And a plurality of second electrodes dip the polymer solution in at least one liquid dividing groove in an alternating motion mode.

9. The device for producing high molecular nano-fibers with adjustable power supply according to any one of claims 1 to 8, wherein the second electrode (4) is powered on when reaching a preset distance range from the receiving device (7), and the polymer solution on the second electrode can reach the base material in a similar spraying state and density, so that the base material and the spun yarn form a nano-fiber layer with uniform density.

10. The apparatus for producing polymeric nanofibers according to any one of claims 1 to 9, wherein a moving assembly is disposed around an end of the liquid bath in such a manner that the second electrode reciprocates in a non-vertical direction.