Layered injector for electrostatic spinning

Abstract

The utility model relates to a layered injector for electrostatic spinning, which comprises an injector needle cylinder with an injection port, a spinning needle head is clamped on the injection port, a piston channel communicated with the injection port is arranged in the injector needle cylinder, and an injection piston capable of sliding in a sealing manner is arranged on the inner side of the piston channel. In addition, a layering piston which slides in a sealing mode with the piston channel is further arranged between the injection piston and the injection port. The piston channel in the syringe needle cylinder is divided into the two independent containing areas through the layered piston and the like, and the two containing areas can store spinning solutions of different components. Fiber membranes with different components in the thickness direction can be prepared in the single-time electrostatic spinning process, the problem that an existing injector can only contain a single-system spinning solution during electrostatic spinning, and consequently the injector needs to be replaced for manufacturing two layers of fiber membranes with different components is well solved, the fiber membrane manufacturing efficiency is improved, and the production cost is reduced. And moreover, the time for replacing the injector is saved, the material cost is low, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrospinning equipment technical field, concretely relates to a layered injector for electrospinning. BACKGROUND

[0002] Electrospinning is a special fiber manufacturing process, by in strong electric field environment, the polymer solution or melt is extruded from the spinneret, and the charged jet is formed, when the jet flies in the process of stretching and solvent volatilization or melt cooling solidification, micron to nanometer diameter polymer fiber can be produced. In addition, electrospinning technology due to its low requirement for equipment, simple operation, and the fiber membrane porosity produced is high, the fiber continuity is good, and at the same time, functional precursor can be added in the polymer, to prepare the functional fiber membrane loaded with different functional components, which is widely used in the field of biological medicine, catalysis and energy.

[0003] Common electrospinning equipment is mainly composed of high-voltage power supply, spinneret, injection pump and receiving device, wherein the high-voltage power supply is used to provide high-strength electric field for jet movement, the spinneret stores the polymer raw material to be spun, and the raw material is sprayed from the spinneret by the pumping of the injection pump, and is collected and stored on the receiving device after jet movement forming. Among them, the spinneret is the outlet of the polymer solution or melt in electrospinning, and the injector is usually used as the spinneret under normal circumstances to improve the convenience of sucking and spraying the raw liquid.

[0004] However, due to the structural limitation of the existing electrospinning injector, only one kind of raw liquid (spinning liquid) can be stored at the same time, and only a fiber membrane with uniform composition in the thickness direction can be prepared in a single electrospinning process. To realize the manufacture of multi-layer fiber membrane with different components, the spinning process needs to be paused, and the injector filled with different component spinning liquid needs to be replaced for secondary electrospinning, which wastes time, reduces the efficiency of fiber membrane preparation, greatly reduces the spinning efficiency, and the long replacement time will lead to the increase of the solidification degree of the lower fiber membrane, reduce the bonding force of the new fiber membrane layer to the lower fiber membrane, and affect the performance of the final fiber membrane. To realize the manufacture of multi-layer fiber membrane with different components, the spinning process needs to be paused and the injector filled with different raw liquids needs to be replaced, which also increases the material cost of using the injector, which is very inconvenient and practical.

[0005] Therefore, it is urgent to provide a layered injector for electrospinning to improve the above problems. UTILITY MODEL CONTENT

[0006] The utility model wants to solve the technical problem in view of the above prior art, including the syringe needle cylinder with injection port, the injection port is clamped with spinning needle head, and the piston channel that communicates with injection port is set up in syringe needle cylinder, and is equipped with the injection piston that can seal sliding in the inboard of piston channel, in addition, the layered piston that is sealed sliding with piston channel is equipped between injection piston and injection port.

[0007] Preferably, three cavities are set up in the layered piston, the three cavities are all in the structure of frustum of cone, and the axis of the three cavities all coincide with the axis of piston channel, wherein the cavity near injection port is front cavity, the cavity near injection piston is rear cavity, and the middle cavity is communicated between front cavity and rear cavity, and the inner diameter of middle cavity gradually increases along the direction of spinning solution outlet.

[0008] Preferably, the middle cavity is sealed with sealing ball.

[0009] Preferably, the side wall of front cavity is installed with filter screen.

[0010] Preferably, the end of injection piston away from layered piston is fixedly connected with piston rod.

[0011] Preferably, the layered piston divides piston channel into two independent containing areas, wherein the area between layered piston and injection piston is rear containing area, and the area between layered piston and injection port is front containing area.

[0012] Compared with prior art, the utility model has the beneficial effects that:

[0013] The utility model divides the piston channel in syringe needle cylinder into two independent containing areas through layered piston, and the two containing areas can store spinning solution of different components. In the process of electrospinning, different components of fiber membrane in thickness direction can be prepared in single electrospinning process, which solves the problem that the existing syringe can only contain single system spinning solution in electrospinning, so as to replace the syringe for manufacturing two-layer different component fiber membrane, improves the fiber membrane manufacturing efficiency, saves the time for replacing the syringe, reduces the spinning material cost, and improves the production efficiency. ACCURACY OF DRAWINGS

[0014] Figure 1 It is the structure diagram of the layered piston of the utility model.

[0015] Figure 2 It is the sectional view of the layered piston of the utility model.

[0016] Figure 3 It is the plan view of the layered piston of the utility model.

[0017] Figure 4The utility model discloses a working schematic diagram for layered electrostatic spinning.

[0018] Illustration:

[0019] 1, layered piston;2, front cavity;3, middle cavity;4, rear cavity;5, filter screen;6, sealing ball;7, injection piston;8, syringe barrel;9, spinning needle. Specific embodiments

[0020] In order to make the utility model embodiment's purpose, technical scheme and advantage more clear, below will combine the drawing in the utility model embodiment, to the technical scheme in the utility model embodiment, clear, complete description, obviously, the described embodiment is the part embodiment of the utility model, instead of all the embodiment. Based on the embodiment in the utility model, all other embodiments that the ordinary skill in the art obtains without making the creative labor belong to the range of the utility model protection.

[0021] It needs to be explained that when an element is called "fixed to" another element, it can be directly on another element or there can be a middle element. When an element is considered "connected" to another element, it can be directly connected to another element or there can be a middle element.

[0022] Specific implementation

[0023] Please refer to Figures 1-4 As shown in the utility model discloses a layered syringe for electrostatic spinning, including the syringe barrel 8 with injection port, and the spinning needle 9 is clamped on the injection port, and the piston channel that is communicated with the injection port is seted up in the syringe barrel 8, and the injection piston 7 that can seal sliding is arranged in the inboard of piston channel, in addition, the layered piston 1 that is sealed sliding with the piston channel is further arranged between the injection piston 7 and the injection port, and the layered piston 1 and the injection piston 7 are all rubber pistons, and the material can be butyl rubber or isoprene rubber, with certain elastic deformation ability.

[0024] Further, the layered piston 1 is provided with three cavities, and the three cavities are all in the shape of a truncated cone, and the axes of the three cavities coincide with the axis of the piston channel, wherein the cavity close to the injection port is the front cavity 2, the cavity close to the injection piston 7 is the rear cavity 4, and the middle cavity 3 is communicated between the front cavity 2 and the rear cavity 4, and the inner diameter of the middle cavity 3 gradually increases along the direction of the spinning liquid outlet.

[0025] Further, the middle cavity 3 is sealed with a sealing ball 6, and the sealing ball 6 is in interference fit with the middle cavity 3 in the implementation, the sealing ball 6 is made of corrosion-resistant materials such as rubber, glass, and stainless steel, and the diameter of the sealing ball 6 is smaller than the diameter of the front side of the middle cavity 3 and larger than the diameter of the rear side of the middle cavity 3.

[0026] Further, the side wall of the front cavity 2 is provided with a filter screen 5, the inner diameter of the mesh of the filter screen 5 is smaller than the diameter of the sealing ball 6, and the material of the filter screen 5 is high-strength corrosion-resistant material such as polypropylene, polyethylene or stainless steel.

[0027] Further, the injection piston 7 is fixedly connected with a piston rod at the end away from the layered piston 1.

[0028] Further, the layered piston 1 divides the piston channel into two independent containing areas, the containing areas are dynamic areas, and the two containing areas can store spinning solutions of different components, wherein the area between the layered piston 1 and the injection piston 7 is the rear containing area, and the area between the layered piston 1 and the injection port is the front containing area.

[0029] Please refer to Figures 1-4 In specific implementation, the mesh size of the filter screen 5 can be 20 mesh, the diameter of the rear side of the middle cavity 3 can be 1.5 mm, the diameter of the front side can be 2.5 mm, and the diameter of the sealing ball 6 can be 2 mm.

[0030] Specific operation: first, the syringe barrel 8 is inverted (i.e. the front end of the syringe barrel 8 is downward, and the rear end of the syringe barrel 8 is upward), the first component spinning solution is poured into the end of the syringe barrel 8, then the layered piston 1 in the design is placed into the syringe barrel 8, and then the syringe barrel 8 is placed upright, the piston rod is used to push the injection piston 7, the pushed injection piston 7 drives the layered piston 1 to the desired position area, i.e. the first component spinning solution enters the front containing area, then the piston rod is used to pull out the injection piston 7 from the syringe barrel 8; second, the syringe barrel 8 in the first step is inverted again, the second component spinning solution is poured into the end of the syringe barrel 8, the piston rod is used to drive the injection piston 7 to re-insert into the syringe barrel 8, i.e. the second component spinning solution enters the rear containing area, i.e. there are two different component spinning solutions in the syringe barrel 8, then the syringe barrel 8 is placed upright at the same time, finally the piston rod is used to drive the injection piston 7, the injection piston 7 extrudes the rear containing area to drive the layered piston 1, then the residual air in the front containing area of the syringe barrel 8 is discharged, and then the first spinning solution can reach the tail end of the spinning needle 9 under the pressure of the layered piston 1 to perform the electrospinning process, and when the electrospinning process of the first spinning solution is completed, the electrospinning process of the second spinning solution can be performed immediately. (In addition, it is worth mentioning that when all the electrospinning is completed, the piston rod and the injection piston 7 can be pulled out first, then the spinning needle 9 can be pulled out, and then the layered piston 1 can be taken out of the syringe barrel 8 by using tweezers or pushed out of the syringe barrel 8 by using a thin needle, in general, the design is convenient to disassemble, clean and replace.

[0031] The working principle of the layered electrospinning is as follows: in the electrospinning process, when the piston rod is displaced to the front end of the syringe needle cylinder 8, that is, the second component spinning solution is extruded, the pressure is also transmitted to the layered piston 1, so that the layered piston 1 is pushed to the front section of the syringe needle cylinder 8, and the first component spinning solution in the front containing area is extruded to perform the electrospinning process. After the first component spinning solution in the front containing area is completely extruded, the layered piston 1 is also displaced to the front end of the syringe needle cylinder 8. At this time, the pressure generated by the injection of the injection piston 7 is transferred to the sealing ball 6 in the middle cavity 3 by the second spinning solution and the residual air in the rear containing area. Then, as the applied pressure increases, the sealing ball 6 in the middle cavity 3 is pushed out of the middle cavity 3, enters the front cavity 2, and is intercepted by the filter screen 5 to avoid blocking the injection port of the syringe needle cylinder 8. Since the sealing ball 6 is pushed out of the middle cavity 3, the front cavity 2 in the layered piston 1 is in communication with the rear cavity 4, and the residual air in the rear containing area is also discharged. Then, the second spinning solution can flow through the layered piston 1 to the tail end of the spinning needle 9 under the pressure of the injection piston 7 to perform electrospinning. Thus, a fiber membrane with different components in the thickness direction can be prepared in a single electrospinning process. The problem that the existing syringe can only contain a single system spinning solution during electrospinning, thereby requiring replacement of the syringe to manufacture a two-layer fiber membrane with different components, is well solved. The fiber membrane manufacturing efficiency is improved, the time for replacing the syringe is saved, the spinning material cost is reduced, and the production efficiency is improved.

[0032] It should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0033] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A layered syringe for electrospinning, characterized by: The injection syringe barrel (8) is provided with a spinning needle head (9) clamped on the injection port, and a piston channel is formed in the injection syringe barrel (8) and communicates with the injection port.

2. The layered syringe for electrospinning of claim 1, wherein: The layered piston (1) is provided with three cavities, which are all in the shape of a frustum of cone, and the axes of the three cavities coincide with the axis of the piston channel, wherein the cavity close to the injection port is the front cavity (2), the cavity close to the injection piston (7) is the rear cavity (4), and the middle cavity (3) is communicated between the front cavity (2) and the rear cavity (4), and the inner diameter of the middle cavity (3) gradually increases along the direction of the spinning liquid outlet.

3. The layered syringe for electrospinning of claim 2, wherein: The middle cavity (3) is sealed by a sealing ball (6).

4. The layered syringe for electrospinning of claim 2, wherein: The side wall of the front cavity (2) is provided with a filter screen (5).

5. The layered syringe for electrospinning of claim 1, wherein: The injection piston (7) is fixedly connected with a piston rod at the end away from the layered piston (1).

6. The layered syringe for electrospinning of claim 1, wherein: The layered piston (1) divides the piston channel into two independent containing areas, wherein the area between the layered piston (1) and the injection piston (7) is the rear containing area, and the area between the layered piston (1) and the injection port is the front containing area.

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