CN102703996A - Electrostatic spinning device - Google Patents

Abstract

A bubble electrospinning device that can control the ambient temperature. The bubble electrospinning device sets the liquid reservoir and the receiving electrode plate in a constant temperature device, so that the ambient temperature during the electrospinning process is fixed at a constant temperature by the constant temperature device, thus avoiding the impact caused by the change of the ambient temperature. Product quality fluctuations, improve work efficiency.

Description

Electrospinning device

technical field

The invention belongs to the field of electrostatic spinning, in particular to a temperature-controllable air bubble electrostatic spinning device.

Background technique

Electrospinning technology is currently one of the most direct and basic methods for preparing ultrafine fibers and nanofibers. Nanofibers prepared by electrospinning technology have ultra-high specific surface area, large aspect ratio, high surface activity, and superior The mechanical properties (high strength and high toughness) and other characteristics have very broad application prospects in different fields such as textile engineering, environmental engineering, biotechnology, medical and health care, energy storage, military and anti-terrorism security. With the continuous deepening of research on electrospinning technology, dozens of polymers have successfully prepared ultrafine fibers through electrospinning technology. The diameter of the prepared ultrafine fibers is generally between tens of nanometers and one micron. The diameter of the fiber can reach 1 nm when the conditions are right. The basic principle of preparing ultrafine fibers by electrospinning can be simply summarized as follows: under the action of electric field force in a high-voltage electrostatic field, a polymer solution or melt forms a jet from the end of a capillary or bubble to the receiving device, and the jet arrives at the receiving device. During the installation process, high tension is generated, the fibers are thinned, while the solvent in the solution evaporates or the melt solidifies, and finally the fibers are deposited on the receiving device. Compared with the traditional electrospinning technology, the bubble electrospinning technology has greater advantages, such as improving the spinning efficiency and output of nanofibers.

Bubble electrospinning technology is an important technology for preparing nanofibers. Many scholars have studied its process parameters and spinning system, such as Chinese patents ZL200420020596.3, ZL200410025622.6, etc.; US patents US6616435, US6753454, etc. Studies have shown that in addition to factors such as tip potential, fluid viscosity, electrical conductivity, receiving distance, and surface tension, environmental factors including temperature and relative humidity also have a certain impact on the fiber size obtained by air bubble electrospinning, but the existing equipment is rarely involved in the environment. For temperature control and adjustment, most air bubble electrospinning devices do not have temperature adjustment and control devices. Generally, only room temperature can be selected. The controllability of production is poor, and it is easy to cause large differences in product quality and lower production efficiency.

Contents of the invention

In view of this, the present invention proposes a bubble electrospinning device, which can control the temperature of the bubbles through an external temperature control device during the electrospinning process, thereby reducing the impact of environmental factors on the bubble static electricity. The impact of the spinning process improves the controllability of production and is conducive to the realization of large-scale industrial production of nanofibers.

A kind of bubble electrospinning device that proposes according to the object of the present invention, comprises liquid reservoir, high-voltage electrostatic generator, air pump, jet pipe, air guide tube, metal electrode, receiving plate, grounding electrode and constant temperature device, described liquid storage The pool is a container filled with solution or melt, and the liquid storage pool and the receiving electrode plate are arranged inside the thermostatic chamber device.

Preferably, the constant temperature device is a temperature-adjustable thermostat.

Preferably, the constant temperature device is a constant temperature room.

Preferably, the high-voltage electrostatic generator, air pump, air duct and ground electrode are arranged inside the thermostatic chamber.

Preferably, the constant temperature device includes a temperature setting device, a temperature detection device and a temperature adjustment device.

Preferably, the temperature regulating device includes a heating device and a cooling device.

Preferably, the air injection pipe is arranged in the solution or melt of the liquid storage tank, and the mouth of the air injection pipe is lower than the liquid level of the solution or melt in the liquid storage tank.

Preferably, the air guide tube is connected to the air pump and the air injection tube.

Preferably, the metal electrode is arranged in the gas injection pipe and is electrically connected with the high-voltage electrostatic generator.

Preferably, the receiving electrode plate is electrically connected to the ground electrode, and forms an electric field with the solution or melt in the liquid storage tank.

The above-mentioned bubble electrospinning device, by setting the liquid storage pool and the receiving electrode for electrostatic drawing in a constant temperature device, makes the temperature of the solution or melt artificially controllable, thereby reducing the impact of environmental factors on the bubble electrospinning. The influence of the silk process improves the quality stability and production efficiency of the product.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the first embodiment of the electrospinning device of the present invention;

Fig. 2 is a schematic structural view of the second embodiment of the electrospinning device of the present invention.

Detailed ways

As mentioned in the background art, the existing air bubble electrospinning device lacks effective temperature control during the electrospinning process and completely depends on the ambient temperature. However, the ambient temperature will bring uncontrollable uncertain factors to the electrospinning process, resulting in large differences in product quality and adverse effects on large-scale production.

Therefore, the present invention proposes a bubble electrospinning device that can control the ambient temperature. The bubble electrospinning device sets the liquid storage tank and the receiving plate in a constant temperature device, so that the ambient temperature during the electrospinning process is fixed at a constant temperature by the constant temperature device, thereby avoiding the impact caused by the change of the ambient temperature. Product quality fluctuations, improve work efficiency.

Specifically, the constant temperature device may be a constant temperature box or a constant temperature room. When the constant temperature device is a constant temperature box, it is usually used in the case of small-scale production of the electrospinning device. For example, the receiving plate of the electrospinning device is only a small flat plate, and the amount of nanofibers received is not much. At this time, it is only necessary to arrange the liquid reservoir and the receiving electrode plate of the electrospinning device in the thermostat. And when the volume of the electrospinning device is large, especially when the receiving plate is a large flat plate or a roller plate, all the components of the electrospinning device need to be placed in a constant temperature chamber. The chamber controls the internal temperature to fix the ambient temperature during the electrospinning process.

In the following, the air bubble electrospinning device of the present invention will be clearly and completely described through specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

first embodiment

Please refer to FIG. 1 . FIG. 1 is a schematic structural view of a bubble electrospinning device according to a first embodiment of the present invention. As shown in the figure, the bubble electrospinning device includes a liquid storage tank 1, a constant temperature device 2, a high-voltage electrostatic generator 3, an air pump 4, an air jet tube 5, an air guide tube 6, a metal electrode 7, a receiving plate 8, and a grounding electrode 9 .

The liquid reservoir 1 is an inner hollow container, and its wall is preferably a good conductor of heat, and a solution or a melt used as a source of nanofibers is arranged inside.

The air injection pipe 5 is arranged in the liquid storage tank 1, and is connected with the air pump 4 through the air guide pipe 6, and the air pump 4 is used to provide positive pressure gas, which is ejected from the air injection pipe 5, and the solution or Bubbles are formed in the melt, and the air pump 4 can specifically be a high-pressure gas cylinder, an air cylinder, a manual extrusion nozzle, and the like. The nozzle of the jet pipe 5 should be lower than the solution or the melt level in the liquid reservoir 1.

The metal electrode 7 is arranged in the jet pipe 5, the metal electrode 7 is electrically connected with the high-voltage electrostatic generator 3, the solution or melt in the liquid storage pool 1 is connected with the high-voltage electrostatic generator 3 through the metal electrode 7, and the liquid storage A receiving plate 8 connected to a ground electrode 9 is arranged above the pool, and an electric field is formed between the receiving plate 8 and the solution or melt in the liquid storage pool 1 .

In this embodiment, the constant temperature device 2 is a constant temperature box, and the liquid storage tank 1 and the receiving electrode plate 8 are arranged in the constant temperature box. The constant temperature box may be a device with an observation window on one side and capable of setting the temperature inside the box. Further, the incubator includes a temperature setting device, a temperature detecting device and a temperature regulating device (not shown in the figure). Wherein the temperature setting device is such as an input keyboard or a mediation knob, and the temperature setting device is installed on the outer surface of the thermostat box, and the personnel can input the set temperature through the temperature setting device. If the internal temperature is constant at 60 degrees, then enter 60 degrees through the input keyboard or point the adjustment knob to 60 degrees. The temperature detecting device is arranged inside the box body of the thermostatic box, and is used for detecting the temperature inside the box body, and monitoring the internal temperature of the thermostatic box in real time. The temperature regulating device further includes a refrigeration device and a heating device, which can respectively input cold air and hot air to the inside of the box. When starting to work, when the incubator receives the input temperature from the personnel, it starts the temperature detection device to detect the temperature inside the box, and judges whether it is consistent with the target temperature input by the personnel. If it is not consistent, the refrigeration device or heating device is started. The temperature in the box is regulated until the temperature detection device detects that the temperature in the box is consistent with the target temperature.

When the electrospinning device of the present invention is working, first add solution or melt in the liquid storage pool 1, adjust the temperature in the thermostat 2 until the temperature in the thermostat 2 is stable on the desired value; turn on the air pump 4, Regular bubbles may appear on the surface of the heated solution or melt; then turn on the high-voltage electrostatic generator 3, and the free charges inside the solution or melt will be polarized under the action of high-voltage static electricity, especially the top of the bubble. Under appropriate conditions, Due to the effect of electrostatic force, the top of the bubble will generate a fine jet and shoot to the receiving plate 8 connected to the ground electrode 9, so that a large number of nanofibers can be obtained.

second embodiment

Please refer to FIG. 2 . FIG. 2 is a schematic structural view of the air bubble electrospinning device according to the second embodiment of the present invention. As shown in the figure, the bubble electrospinning device includes a liquid storage tank 1, a constant temperature device 2', a high-voltage electrostatic generator 3, an air pump 4, an air jet tube 5, an air guide tube 6, a metal electrode 7, a receiving plate 8, and a grounding electrode 9. An air jet pipe 5 is arranged in the liquid storage tank 1, and the air jet pipe 5 is connected to the air pump 4 through an air guide tube 6. The nozzle of the air jet pipe 5 should be lower than the liquid level of the solution or the melt in the liquid storage pool 1. The metal electrode 7 is arranged in the jet pipe 5, the liquid storage tank 1 is connected with the high-voltage electrostatic generator 3 through the metal electrode 7, and the receiving plate 8 connected to the ground electrode 9 is arranged above the liquid storage tank.

In this embodiment, the constant temperature device 2' is a constant temperature room, such as an ultra-clean workshop with a temperature adjustment device inside. In addition to the liquid storage tank 1 and the receiving plate 8 of the electrospinning device, a high-voltage electrostatic generator 3 , an air pump 4 , an air duct 6 and a grounding electrode 9 are all arranged inside the thermostatic chamber. At this time, the electrospinning device may be a device capable of large-scale electrospinning, and its receiving electrode plate 8 may be a relatively large flat plate or roller.

Same as Embodiment 1, the thermostatic chamber may also include a temperature setting device, a temperature detection device, and a temperature adjustment device (not shown in the figure). Wherein the temperature setting device is such as an input keyboard or a mediation knob, the temperature setting device is installed in the room of the thermostatic chamber, and personnel can input the set temperature through the temperature setting device, for example, it is necessary to keep the indoor temperature constant at 60 degrees, then enter 60 degrees through the input keyboard or point the adjustment knob to 60 degrees. The temperature detecting device is arranged in the room of the thermostatic chamber, and is used for detecting the temperature in the room, and monitoring the internal temperature of the thermostatic chamber in real time. The temperature regulating device further includes a refrigeration device and a heating device, which can respectively input cold air and hot air to the indoor space. When starting to work, when the thermostatic chamber receives the temperature input by the personnel, the temperature detection device is started to detect the indoor temperature, and it is judged whether it is consistent with the target temperature input by the personnel. The temperature is regulated until the temperature detection device detects that the indoor temperature is consistent with the target temperature.

When the electrospinning device of the present invention is working, first add solution or melt in the liquid storage tank 1, adjust the temperature in the thermostat 2' until the temperature in the thermostat 2' stabilizes on the required value; turn on the air pump 4. Regular bubbles may appear on the surface of the heated solution or melt; then turn on the high-voltage electrostatic generator 3, and the free charges inside the solution or melt will be polarized under the action of high-voltage static electricity, especially at the top of the bubbles. Next, due to the effect of electrostatic force, the top of the bubble will generate a fine jet and shoot to the receiving plate 8 connected to the ground electrode 9, so that a large number of nanofibers can be obtained.

In summary, the present invention proposes a bubble electrospinning device. The bubble electrospinning device arranges the liquid storage pool and the receiving plate in a constant temperature device, so that the ambient temperature during the electrospinning process is controlled by a constant temperature. The device is fixed at a constant temperature, thereby avoiding product quality fluctuations caused by ambient temperature changes and improving work efficiency.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An electrospinning device, comprising a liquid storage tank, a high-voltage electrostatic generator, an air pump, an air jet pipe, an air guide tube, a metal electrode, a receiving plate, and a grounding electrode, and the liquid storage tank is equipped with a solution or a melt The container is characterized in that: the air bubble electrostatic device also includes a constant temperature device with a constant internal temperature, and the liquid storage pool and the receiving electrode plate are arranged inside the constant temperature chamber device. 2. The electrospinning device according to claim 1, characterized in that: the constant temperature device is a temperature-adjustable constant temperature box. 3. The electrospinning device according to claim 1, characterized in that: the constant temperature device is a constant temperature chamber. 4. The electrospinning device according to claim 3, characterized in that: the high-voltage electrostatic generator, air pump, air guide tube and ground electrode are arranged inside the thermostatic chamber. 5 . The electrospinning device according to claim 1 , wherein the constant temperature device comprises a temperature setting device, a temperature detection device and a temperature adjustment device. 6. The electrospinning device according to claim 5, wherein the temperature regulating device comprises a heating device and a cooling device. 7. The electrospinning device according to claim 1, characterized in that: the air jet pipe is arranged in the solution or melt of the liquid storage tank, and the mouth of the air jet pipe is lower than the liquid storage tank solution or melt level. 8. The electrospinning device according to claim 1, characterized in that: the air guide tube is connected to the air pump and the air spray tube. 9 . The electrospinning device according to claim 1 , wherein the metal electrode is disposed in the air jet tube and is electrically connected to the high-voltage electrostatic generator. 10 . 10 . The electrospinning device according to claim 1 , wherein the receiving plate is electrically connected to the ground electrode, and forms an electric field with the solution or melt in the liquid reservoir. 11 .

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