CN107142534A - A kind of solution jet spinning equipment - Google Patents

Abstract

The invention discloses a solution jet spinning equipment. The spinning equipment comprises a feeding device, a spinning die head, a receiving device, a spinning box body, an air jet device and a heating device. The spinning box body includes a The air inlet chamber, the molding chamber and the suction chamber are set in sequence from the bottom, and the air inlet chamber, the molding chamber and the suction chamber are connected to each other, and the heating device is located between the air inlet chamber and the molding chamber. The receiving device is located between the forming chamber and the suction chamber, the spinning die is located in the forming chamber, and several spinning capillaries are arranged in the spinning die, the spinning die is arranged obliquely, and the spinning Several spinneret capillaries in the die head have an included angle with the horizontal plane. When the spinning solution is extruded from the spinneret capillaries in the spinning die head, it is stretched and thinned by the high-pressure airflow formed by the air jet device, and formed in the molding chamber. nanofibers.

Description

A solution jet spinning equipment

technical field

The invention belongs to the technical field of spinning equipment, in particular to a solution jet spinning equipment.

Background technique

Nanofibers generally refer to ultrafine fibers with a diameter of less than 5 microns or even nanometers. Due to the advantages of small diameter and large specific surface area, nanofibers are considered to be a high-performance, high-value-added fiber product, and are used in filter materials, thermal insulation materials, oil-absorbing materials, medical and sanitary materials, battery separators, and sound insulation materials. There is a growing demand for nanofibers and nonwoven fabrics made from nanofibers.

Electrospinning is currently one of the main ways to prepare nanofibers. Its core is to make the charged spinning solution or melt flow and deform in the electric field, and then solidify through the evaporation of the solvent or the cooling of the melt to obtain fibrous materials. ; But the low output and high equipment cost limit the electrospinning technology from the laboratory to the industrial production. The meltblown method is the most commercialized and scaled nanofiber nonwoven fabric manufacturing method, and there are many related patent technical documents; due to the high requirements on the melt flow performance of the raw material, the meltblown method is currently limited to polypropylene , polyester, polylactic acid and a few polymers, but for most polymers such as polyacrylonitrile, polyvinylidene fluoride, cellulose, starch, chitosan, etc., due to poor melt fluidity and easy pyrolysis , Non-thermoplastic and other reasons cannot be processed.

Solution jet spinning technology is a new type of micro-nano fiber preparation technology owned by our laboratory [Patent No. ZL201110041792.3]. Micro-nanofibers are produced, which has a higher spinning efficiency than electrospinning. Moreover, the thin stream of spinning solution is in a three-dimensional curled shape and entangled with each other due to the turbulent shearing effect of the high-speed air field inside the spinning box. This method has a short processing flow, simple process, easy control of conditions, and large-scale production. ; The average diameter of the nanofibers of the nonwoven fabric is 0.01-3 μm, which is smaller than the fiber diameter of the conventional polypropylene meltblown nonwoven fabric, and has excellent performance; it uses an unlimited polymer solution as the processing object, which can overcome the existing Melt-blown technology requires thermoplasticity and high melt fluidity of raw materials, and has universal applicability.

In recent years, the solution jet spinning method has been using single nozzle spinning equipment, and the spinning forming environment is open, the production rate is extremely low, and the spinning process is unstable, which affects the forming of fibers to a certain extent, and cannot meet the requirements of large-scale production. production requirements. In view of this, we have developed a solution jet spinning equipment, which provides a technical solution that can better solve industrial production.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a solution jet spinning equipment, which can realize multi-die synchronous spinning, the molding chamber is located between the air inlet chamber and the suction chamber, the suction chamber and the air inlet chamber The unidirectional airflow formed by the chamber can accelerate the volatilization of the solvent in the spinning solution when passing through the forming chamber, and collect the formed nanometer fibers on the receiving device; at the same time, the spinning die head is inclined to make the extruded through the spinning die head The fine flow of the spinning solution forms an included angle with the horizontal plane, and the contact surface between the unidirectional airflow and the fine flow of the spinning solution is enlarged to ensure a more thorough volatilization of the solvent and make the fiber fineness more uniform.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

A solution jet spinning equipment, the spinning equipment includes a feeding device, a spinning die and a receiving device, characterized in that the spinning equipment also includes a spinning box, an air jet device and a heating device, the The spinning box includes an air inlet chamber, a forming chamber and a suction chamber arranged in sequence from top to bottom, and the air inlet chamber, the forming chamber and the suction chamber are connected to each other, and the heating device is located between the air inlet chamber and the suction chamber. Between the forming chambers, the receiving device is located between the forming chamber and the suction chamber, the spinning die is located in the forming chamber, and several spinning capillaries are arranged in the spinning die, and the spinning die is The several spinneret capillaries in the spinning die form an included angle with the horizontal plane. When the spinning solution is extruded from the spinneret capillaries in the spinning die, the high-pressure airflow formed by the airflow injection device stretches the filaments. The nanometer fiber is formed in the forming chamber, and the one-way airflow formed by the suction chamber and the air inlet chamber accelerates the volatilization of the solvent in the spinning solution, and the formed nanometer fiber is collected on the receiving device.

As preferably, the air flow injection device includes an air storage tank, an air compressor and an air inlet pipe, the feeding device includes a dissolution kettle, a heating box and a metering pump, and a solution filter is arranged between the dissolution kettle and the heating box , An observation window is provided in front of the forming chamber, and a heating coil and a stirring device are provided on the dissolution kettle.

As preferably, the spinning die head is provided with a feeding hole and an air inlet, the feeding hole is connected to the dissolution kettle through a metering pump, the several spinning capillaries are connected to the feeding hole, and the dissolving The spinning solution in the kettle enters the spinning die through the feeding hole, and is extruded through the spinning capillary to form a thin spinning stream during extrusion. The high-pressure gas in the tank enters the spinning die through the air inlet, and forms a high-pressure airflow when it is ejected, and the high-pressure airflow stretches and refines the spinning fine flow to form nano-micron fibers.

As preferably, the spinning die is fixed in the molding chamber by a moving device, the moving device is a forward and backward moving device, the moving device is provided with a fixed head, and the spinning die is fixed in the moving device by a fixed head superior.

Preferably, the air inlet chamber is provided with an air inlet and a lower air outlet, the lower air outlet is facing the molding chamber, a perforated plate is arranged at the lower air outlet, and the heating device is several heating rods, and the heating rods Located below the lower air outlet, the suction chamber is provided with an air chamber with an opening above the air chamber, and several air outlets are arranged below the air chamber, the air outlets are connected with the filter device through a suction fan, and the air outlets are There is a filter cotton.

As preferably, the receiving device includes a reel, a motor, a horizontal receiving frame and a net curtain arranged on the horizontal receiving frame, the wind cavity is located below the horizontal receiving frame, the reel is driven to rotate by the motor, and the reel and the motor There are two sets, which are symmetrically located on both sides of the spinning box, and non-woven fabrics are wound between the two reels. Rotating rollers, two rotating rollers are erected at both ends of the horizontal receiving frame, the reel is located below the rotating rollers, and a pressure roller is arranged above the mesh curtain, the non-woven fabric passes between the pressure roller and the mesh curtain, and is formed The nanometer fibers formed by the chamber are collected on the non-woven fabric under the action of the suction chamber, and are wound and collected on the reel driven by the non-woven fabric.

Preferably, both the heating box and the heating rod are electrically connected to the protection switch.

As a preference, several spinning dies are provided, and the several spinning dies are evenly arranged in a row, and each spinning die is respectively connected with a feeding device and an air injection device.

Preferably, the several spinneret capillaries are arranged parallel to each other.

Preferably, the included angles formed between the several spinning capillaries and the horizontal plane range from 15° to 60°, and the optimal solution is 45°.

The advantages of the present invention are:

1. Multi-die synchronous spinning can be realized. The molding chamber is located between the air inlet chamber and the suction chamber. The unidirectional airflow formed by the suction chamber and the air inlet chamber can accelerate the volatilization of the solvent in the spinning solution when passing through the molding chamber. And the formed nanofibers are collected on a receiving device.

2. In order to better collect nano-micron fibers on the non-woven fabric, we set up an air cavity under the net curtain, while we used a vacuum chamber before. Compared with the vacuum chamber, the air cavity can also realize the nano-micron fibers on the non-woven fabric. Condensation and collection on the cloth, and the advantage of the air chamber is that it has low requirements for equipment, low cost, easy to realize, and is convenient for industrialization. An air outlet is set under the air chamber to ensure that the non-woven fabric at the mesh curtain is evenly sucked sex.

3. The nanometer fiber obtained in the present invention is collected on the non-woven fabric, and under the drive of the non-woven fabric, it is wound and collected on the reel. After the spinning is completed, the non-woven fabric is removed from the reel. According to actual needs, the nanometer fibers on the non-woven fabric can be stripped. The non-woven fabric in the present invention is arranged above the net curtain, and the net curtain plays a supporting role. The non-woven fabric directly receives the net curtain, which has the advantage of being easy to organize , preservation, low cost, and the non-woven fabric is breathable, so as not to block the downward flow of unidirectional airflow.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is a front view of the present invention (the arrow in the figure is the flow direction of the unidirectional airflow, and the dotted line is the formed micro-nano fiber).

Fig. 2 is a left view of the present invention.

Fig. 3 is a schematic diagram of the connection structure of the present invention.

Fig. 4 is the flow direction of the spinning solution.

The scanning electron micrograph of the PAN nanofiber nonwoven fabric prepared in Example 2 of Fig. 5 .

The scanning electron micrograph of the PAN nanometer fiber nonwoven fabric prepared in the embodiment 3 of Fig. 6.

The scanning electron micrograph of the PAN nanofiber nonwoven fabric prepared in Example 4 of Fig. 7 .

The scanning electron micrograph of the PAN nanofiber nonwoven fabric prepared in Example 5 of Fig. 8 .

Among them: 1. Air inlet chamber 2. Molding chamber 3. Suction chamber 4. Heating device

5. Receiving device 6. Spinning die head 7. Air storage tank 8. Air compressor

9. Air intake pipe 10. Dissolving kettle 11. Heating box 12. Metering pump

13. Solution filter 14. Observation window 15. Heating coil 16. Stirring device

17. Intake pipe 18. Mobile device 19. Fixed head 20. Air inlet

21. Air cavity 22. Air outlet 23. Suction fan 24. Filter device

25. Reel 26. Motor 27. Horizontal receiving frame 28. Net curtain

29. Non-woven fabric 30. Turning roller 31. Pressing roller 32. Lower tuyere 33. Perforated plate

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are 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 making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

Example 1

A solution jet spinning equipment, the spinning equipment includes a feeding device, a spinning die and a receiving device, the spinning equipment also includes a spinning box, an air jet device and a heating device, the spinning box Including from top to bottom, the air inlet chamber 1, the molding chamber 2 and the suction chamber 3 are arranged sequentially, and the air inlet chamber, the molding chamber and the suction chamber are connected to each other, and the heating device 4 is located between the air inlet chamber and the suction chamber. Between the forming chambers, the receiving device 5 is located between the forming chamber and the suction chamber, the spinning die 6 is located in the forming chamber, and several spinning capillaries (not marked in the figure) are arranged in the spinning die spinning capillary), the number of the spinning capillary is between 80-140, and the several spinning capillaries are arranged in parallel with each other. The spinning die 6 is arranged obliquely, and the several spinneret capillaries in the spinning die all form an included angle with the horizontal plane, the included angle is preferably 45°, and the spinning solution passes through the spinneret capillaries in the spinning die During extrusion, the high-pressure airflow formed by the airflow injection device is stretched and thinned, and nano-micron fibers are formed in the forming chamber. The nanofibers are collected on a receiving device.

Described air flow ejection device comprises air storage tank 7, air compressor 8 and air intake pipe 9, and described feeding device comprises dissolving still 10, heating box 11 and metering pump 12, is provided between described dissolving still 10 and heating box 11 There is a solution filter 13, the dissolving kettle 10 is located behind the molding chamber 2, an observation window 14 is provided in front of the molding chamber 2, and a heating coil 15 and a stirring device 16 are arranged on the dissolving kettle 10.

The several spinning dies are evenly arranged in a row, and each spinning die is connected to the feeding device and the air jet device respectively. When multiple spinning dies are set, each die works independently, that is, Separate liquid intake and separate air intake will not interfere with each other, ensuring the independence of the work of each spinning die head; the spinning die head 6 is provided with a feed hole and an air inlet hole, and the feed hole The metering pump 12 is connected to the dissolving kettle 10, and the several spinneret capillaries are connected to the feed holes, and the spinning solution in the dissolving kettle enters the spinning die through the feed holes, and is extruded through the spinneret capillaries. Spinning fine flow is formed during extrusion, and the air intake hole is connected to the air storage tank 7 through the air intake pipe 17, and the high-pressure gas in the air storage tank enters the spinning die through the air intake hole, and forms a high-pressure air flow when ejected , the high-pressure airflow stretches and refines the fine spinning stream to form nanometer fibers.

The spinning die 6 is fixed in the molding 2 chamber by a moving device 18, the moving device 18 is a forward and backward moving device, the moving device 18 is provided with a fixed head 19, and the spinning die 6 passes through the fixed head 19 Fixed on mobile device 18 .

The air inlet chamber 1 is provided with an air inlet 20 and a lower air outlet 32, the lower air outlet 32 is facing the molding chamber 2, and the lower air outlet 32 is provided with a perforated plate 33, and the arrangement of the perforated plate ensures the " "wind" has good uniformity, the heating device 4 is several heating rods, the heating rods are located below the lower tuyere 32, the suction chamber is provided with a wind cavity 21, the upper opening of the wind cavity 21, the Several air outlets 22 are arranged below the air cavity 21, and the air outlets 22 are connected to the filter device 24 through a suction fan 23, and filter cotton is arranged at the air outlet 22, and the setting of the filter cotton controls the suctioned wind. After preliminary filtration, it enters the filter device for in-depth filtration, thus ensuring the environmental protection of the discharge.

Described receiving device comprises reel 25, motor 26, horizontal receiving frame 27 and the net curtain 28 that is located on the horizontal receiving frame 27, and described air chamber 21 is positioned at below horizontal receiving frame 27, and described reel 25 is driven to rotate by motor 26, The reel 25 and the motor 26 are provided with two, respectively located symmetrically on both sides of the spinning box, and a non-woven fabric 29 is wound between the two reels 25, and the non-woven fabric 29 located in the forming chamber is close to the net curtain 28, the net curtain 28 is wound through two rotating rollers 30, and the two rotating rollers 30 are erected at both ends of the horizontal receiving frame 27, the reel 25 is located below the rotating roller 30, and a pressure roller is arranged above the net curtain 28 31, the non-woven fabric 29 passes between the pressing roller 31 and the net curtain 28, and the nanometer fibers formed in the forming chamber are collected on the non-woven fabric under the action of the suction chamber, driven by the non-woven fabric Next, the winding is collected on a reel.

Both the heating box and the heating rod are electrically connected with a protection switch.

The length of the molding chamber in this embodiment is between 1.2-1.5 meters, the width is between 1-1.2 meters, and the height is between 1.3-1.5 meters, but it is not limited to this size data, and it can be corresponding according to the number of spinning dies Adjust the size of the forming chamber. The spinning die is located at the upper left of the forming chamber. Since the spinning die is inclined, the spinning capillary on the spinning die forms an angle with the horizontal plane, and the spinning capillary on the spinning die The extruded spinning solution is also obliquely ejected. In this embodiment, the spinning die is set on the upper left of the forming chamber, so that the nanometer fibers formed by stretching and thinning by the high-pressure air flow flow from the upper left of the forming chamber to the On the right side of the horizontal receiving frame, the nano-micron fiber moves obliquely during the forming process, and has a certain angle with the horizontal receiving frame. The atmospheric wind in the forming room is vertically downward under the action of the air outlet and suction fan below. The moving one-way airflow, before the spinning die head is set vertically, the nano-micron fiber moves vertically downward during the forming process, the atmosphere wind in the forming room is in the same direction as the nano-micron fiber movement direction, and the combination of the atmosphere wind and the nano-micron fiber cannot be achieved. Effective contact of fibers, in the present invention, there is a certain angle between the direction of movement of nanometer fibers and the atmosphere wind of the unidirectional airflow, the beneficial effect is: increasing the forming stroke of nanometer fibers in a limited space, ensuring that the spinning solution The solvent volatilizes more thoroughly; the movement direction of the nano-micro fiber and the atmospheric wind of the one-way air flow have a certain angle, which increases the contact surface between the nano-micro fiber and the one-way air flow, and on the one hand, it can make the solvent in the spinning solution volatilize It is more thorough, and on the other hand, it makes the formed nanofibers have better uniformity. Similarly, the spinning die head can also be set on the upper right of the molding chamber.

The spinning solution is heated in two steps, the first is the heating of the heating coil of the dissolution tank, which accelerates the dissolution of the solute and improves the uniformity of the spinning solution; the second is heating again when the spinning solution flows through the heating box , by setting the heating box, the concentration of the spinning solution is greatly increased, the spinning speed is increased to a certain extent, and the fiber fineness obtained is more uniform.

When the spinning solution is extruded through the spinning die, it is stretched and thinned by the high-pressure airflow formed by the air jet device, and nano-micron fibers are formed in the forming chamber, while the unidirectional airflow formed by the suction chamber and the air inlet chamber accelerates the spinning solution. The solvent evaporates and the nanofibers formed are collected on a receiving device. The two "winds" set up in this equipment are high-pressure airflow and unidirectional airflow respectively. Atmospheric wind is formed in the room to accelerate the volatilization of the solvent in the spinning solution, ensure the uniformity of the formed fibers, further increase the fineness of the fibers, and collect the formed nano-micron fibers to the receiving device; these two "winds" can be Heated, the heating of the high-pressure airflow realizes heating when it flows through the heater (not shown in the figure), the heating of the unidirectional airflow realizes heating when it flows through the heating rod, and the initial temperature can be determined according to the volatilization of the solvent used in the spinning solution The specific temperature needs to be determined according to multiple spinning experiments. Both the heater and the heating rod are electrically connected with the protection switch, and when there is no air flow passing through, the protection switch will stop the heating operation of the heater and the heating rod, thereby ensuring safety.

Due to the fineness of nano-micron fibers, in the prior art, the formed nano-micron fibers are deposited on the collection net curtain, and then peeled off later. Most of the collection net curtains are made of tinfoil paper. This type of collection net curtain The cost is higher, it is not easy to preserve, and it is not suitable for industrial production. Therefore, the nanometer fiber obtained in the present invention is collected on the non-woven fabric, and is wound and collected on the reel driven by the non-woven fabric. After the spinning is completed, the non-woven fabric is removed from the reel, and the nanometer fibers on the non-woven fabric can be stripped according to actual needs in the later stage. The non-woven fabric in the present invention is arranged above the net curtain, and the net curtain acts as a support Function, the non-woven fabric is used as a direct receiving net curtain, the advantage is that it is easy to arrange and store, the cost is low, and the non-woven fabric is breathable, so that it will not block the downward flow of the one-way air flow; in order to better integrate the nanometer fiber Collected on the non-woven fabric, we set up an air cavity under the net curtain, and we used a vacuum chamber before. Compared with the vacuum chamber, the air cavity can also realize the condensation and collection of nanometer fibers on the non-woven fabric, and the air cavity The advantage is that it has low requirements for equipment, low cost, easy to realize, and is convenient for industrialization promotion. An air outlet is set under the air cavity to ensure the uniformity of air suction of the non-woven fabric at the mesh curtain. It can be used at any time according to the needs of industrialization. Adjusting the size of the forming chamber can ensure the uniformity of air suction of the non-woven fabric at the net curtain.

Install a spinning die head with 120 spinning capillaries. Through this equipment, our spinning speed has been increased from 5 g/h of the previous open single nozzle to 550 g/h, increasing the spinning die head. Quantity, production doubled accordingly.

Example 2

Install a spinning die head, carry out spinning by the present invention, polymer polyacrylonitrile (PAN) is dissolved in the ratio of mass fraction 15% in N, N-dimethylacetamide, stir 30- in the dissolving tank Mix evenly for 60 minutes to make a spinning solution. The spinning parameters are: the drafting wind pressure used to form the high-pressure airflow is 2.6bar, the temperature of the high-pressure airflow is 45°C, and the spinning speed is 207ml/h. The suction pressure of the airflow is 4413.6pa. The temperature of the one-way airflow is room temperature. During the spinning process, the temperature of the dissolution tank is kept at 40°C. The high-pressure airflow stretches the fine flow of the spinning solution, and the solvent volatilizes to form nano-micron fibers. The fibers are collected on the non-woven fabric under the action of high-speed jet airflow and suction airflow, and the polymer nanofiber nonwoven fabric is made.

Using the SEM image to measure the obtained nanofibers, the diameters of the obtained nanofibers are mainly concentrated between 350-450 nanometers, and the fiber fineness is more uniform.

Example 3

Install a spinning die head, carry out spinning by the present invention, polymer polyacrylonitrile (PAN) is dissolved in the ratio of massfraction 20% in N, N-dimethylacetamide, stir 30- in the dissolving tank Mix evenly for 60 minutes to make a spinning solution. The spinning parameters are: the drafting wind pressure used to form the high-pressure airflow is 2.6bar, the temperature of the high-pressure airflow is 45°C, and the spinning speed is 276ml/h. The suction pressure of the airflow is 4413.6pa. The temperature of the one-way airflow is room temperature. During the spinning process, the temperature of the dissolution tank is kept at 40°C. The high-pressure airflow stretches the fine flow of the spinning solution, and the solvent volatilizes to form nano-micron fibers. The fibers are collected on the non-woven fabric under the action of high-speed jet airflow and suction airflow, and the polymer nanofiber nonwoven fabric is made.

Using the SEM image to measure the obtained nanofibers, the diameters of the obtained nanofibers are mainly concentrated between 700-800 nanometers, and the fiber fineness is more uniform.

Example 4

Install a spinning die head, carry out spinning by the present invention, polymer polyacrylonitrile (PAN) is dissolved in the ratio of mass fraction 15% in N, N-dimethylacetamide, stir 30- in the dissolving tank Mix evenly for 60 minutes to make a spinning solution. The spinning parameters are: the drafting wind pressure used to form the high-pressure airflow is 2.8bar, the temperature of the high-pressure airflow is 45°C, and the spinning speed is 207ml/h. The suction pressure of the airflow is 4413.6pa. The temperature of the one-way airflow is room temperature. During the spinning process, the temperature of the dissolution tank is kept at 40°C. The high-pressure airflow stretches the fine flow of the spinning solution, and the solvent volatilizes to form nano-micron fibers. The fibers are collected on the non-woven fabric under the action of high-speed jet airflow and suction airflow, and the polymer nanofiber nonwoven fabric is made.

Using the SEM image to measure the obtained nanofibers, the diameters of the obtained nanofibers are mainly concentrated between 250-350 nanometers, and the fiber fineness is more uniform.

Example 5

Install a spinning die head, carry out spinning by the present invention, polymer polyacrylonitrile (PAN) is dissolved in the ratio of massfraction 20% in N, N-dimethylacetamide, stir 30- in the dissolving tank Mix evenly for 60 minutes to make a spinning solution. The spinning parameters are: the drafting wind pressure used to form the high-pressure airflow is 3.0bar, the temperature of the high-pressure airflow is 45°C, and the spinning speed is 276ml/h. The suction pressure of the airflow is 4413.6pa. The temperature of the one-way airflow is room temperature. During the spinning process, the temperature of the dissolution tank is kept at 40°C. The high-pressure airflow stretches the fine flow of the spinning solution, and the solvent volatilizes to form nano-micron fibers. The fibers are collected on the non-woven fabric under the action of high-speed jet airflow and suction airflow, and the polymer nanofiber nonwoven fabric is made.

Using the SEM image to measure the obtained nanofibers, the diameters of the obtained nanofibers are mainly concentrated between 550-700 nanometers, and the fiber fineness is more uniform.

In the above description, the preparation method of the present invention employs the following test methods to determine various listed characteristic parameters.

1. Spinning solution concentration: Weigh the polymer mass and the solvent mass with an electronic balance, and calculate the percentage of the polymer mass in the total mass.

2. Nanofiber diameter: observe and measure by scanning electron microscope. For each nanofiber product sample, measure the diameter of 100 fibers to give the average diameter range.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A solution jet spinning equipment, which comprises a feeding device, a spinning die and a receiving device, characterized in that the spinning equipment also includes a spinning box, an air jet device and a heating device, The spinning beam includes an air inlet chamber, a molding chamber and a suction chamber arranged in sequence from top to bottom, and the air inlet chamber, the molding chamber and the suction chamber are connected to each other, and the heating device is located at the inlet between the forming chamber and the forming chamber, the receiving device is located between the forming chamber and the suction chamber, the spinning die is located in the forming chamber, and several spinning capillaries are arranged in the spinning die, and the spinning The die head is arranged obliquely, and several spinneret capillaries in the spinning die head form an included angle with the horizontal plane. When the spinning solution is extruded from the spinneret capillaries in the spinning die head, it is pulled by the high-pressure airflow formed by the air jet device. At the same time, the one-way airflow formed by the suction chamber and the air inlet chamber accelerates the volatilization of the solvent in the spinning solution, and the formed nanometer fibers are collected on the receiving device. 2. a kind of solution jet spinning equipment according to claim 1, it is characterized in that, described air jet device comprises air storage tank, air compressor and air inlet pipe, and described feeding device comprises dissolving tank, heating box and A metering pump, a solution filter is provided between the dissolution kettle and the heating box, an observation window is provided in front of the forming chamber, and a heating coil and a stirring device are provided on the dissolution kettle. 3. a kind of solution jet spinning equipment according to claim 2, is characterized in that, described spinning die head is provided with feed hole and air inlet, and described feed hole is connected with dissolving kettle by metering pump, The several spinneret capillaries communicate with the feed holes, the spinning solution in the dissolution tank enters the spinning die through the feed holes, and is extruded through the spinneret capillaries to form fine spinning streams during extrusion. The air intake hole is connected to the air storage tank through the air intake pipe, and the high-pressure gas in the air storage tank enters the spinning die head through the air intake hole, and forms a high-pressure air flow when ejected, and the high-pressure air flow stretches the spinning fine flow Thinning to form nano-micron fibers. 4. A kind of solution jet spinning equipment according to claim 1, characterized in that, the spinning die head is fixed in the molding chamber by a moving device, the moving device is a forward and backward moving device, and the moving device is provided with There is a fixed head by which the spinning die is fixed on the moving device. 5. A solution jet spinning equipment according to claim 1, characterized in that, the air inlet chamber is provided with an air inlet and a lower air outlet, the lower air outlet is facing the forming chamber, and the lower air outlet is provided with The perforated plate, the heating device is a plurality of heating rods, the heating rods are located below the lower air outlet, the suction chamber is provided with an air chamber, the upper part of the air chamber is opened, and several air outlets are provided below the air chamber , the air outlet is connected to the filter device through a suction fan, and filter cotton is arranged at the air outlet. 6. A kind of solution jet spinning equipment according to claim 5, characterized in that, the receiving device comprises a reel, a motor, a horizontal receiving frame and a mesh curtain arranged on the horizontal receiving frame, and the wind cavity is located at the horizontal Below the receiving frame, the reel is driven by a motor to rotate. There are two reels and the motor, which are symmetrically located on both sides of the spinning box, and non-woven fabric is wound between the two reels. The non-woven fabric is set close to the net curtain, and the net curtain is wound through two rotating rollers, and the two rotating rollers are erected at both ends of the horizontal receiving frame, the reel is located below the rotating roller, and a pressure roller is arranged above the net curtain. The non-woven fabric passes between the pressing roller and the net curtain, and the nanometer fibers formed in the forming chamber are collected on the non-woven fabric under the action of the suction chamber, and are wound and collected under the drive of the non-woven fabric. on the reels. 7. A solution jet spinning device according to claim 2 or 5, characterized in that both the heating box and the heating rod are electrically connected to a protection switch. 8. A kind of solution jet spinning equipment according to claim 1, it is characterized in that, described spinning die head is provided with several, and described several spinning die heads are evenly arranged in a row, each spinning die head The head is respectively connected with the feeding device and the air jetting device. 9. A solution jet spinning device according to claim 1, characterized in that, the several spinning capillaries are arranged in parallel to each other. 10. The continuous solution jet spinning equipment according to claim 1, characterized in that, the angles formed between the several spinning capillaries and the horizontal plane range from 15° to 60°.