CN107142530A - Electrospinning device and its shower nozzle with the positive nozzle pitch of truncated rectangular pyramids nine of auxiliary electrode - Google Patents

Abstract

The invention discloses a nozzle for electrospinning equipment, which comprises a body, the body has a base in the shape of a regular square prism, and a plurality of bases are arranged in an array at intervals; the four corners of the bottom surface of the base are all set There are connection holes; the four sides of the base are respectively provided with side holes, and the height of all the side holes is the same; the top center of the base is provided with a top hole; the vertical extension line of the side hole is located at the vertical extension of the connection hole line and the vertical extension line of the top hole; the base located on both sides of the body, its connection hole, side hole and top hole are equipped with auxiliary electrodes of the same size; the connection holes of the other bases, side holes and The top holes are all provided with nozzles of the same size. The invention also discloses an electrostatic spinning device comprising the spray head. The aforementioned nozzles for electrospinning equipment have smaller differences in the electric field intensity of each nozzle, more uniform electric field at the tip, and have the outstanding advantage of having more needles per unit area.

Description

Electrospinning equipment and its nozzle with auxiliary electrode positive quadrangular platform and nine nozzle intervals

technical field

The invention relates to the technical field of electrospinning, in particular to a regular quadrangular platform nine-nozzle interval array spray head with auxiliary electrodes for electrospinning equipment. The invention also relates to an electrospinning device with the regular quadrangular platform nine-nozzle spacing array nozzle with auxiliary electrodes.

Background technique

As we all know, electrospinning is a special fiber manufacturing process in which a polymer solution or melt is jet-spun in a strong electric field. Under the action of the electric field, the droplet at the needle will change from a spherical shape to a conical shape (that is, "Taylor cone"), and extend from the tip of the cone to obtain a fiber filament. In this way, polymer filaments with nanoscale diameters can be produced.

In the prior art, for the array multi-nozzle electrospinning equipment, it uses a plurality of nozzles arranged in a linear rectangular array on the plane for spinning, which can realize mass production of electrospun fiber membranes. However, after a long period of use, the electric fields at the tips of the nozzles arranged in an array on a plane will affect and interfere with each other, resulting in large differences in the electric fields between different nozzles and resulting in uneven spinning.

Contents of the invention

The object of the present invention is to provide a regular quadrangular platform nine-nozzle interval array nozzle with auxiliary electrodes for electrospinning equipment. The problem of low number of needles. Another object of the present invention is to provide an electrospinning device comprising the regular quadrangular truss nine-nozzle interval array nozzle with auxiliary electrodes.

In order to achieve the above object, the present invention provides a positive quadrangular truss nine-nozzle spacing array nozzle with auxiliary electrodes for electrospinning equipment, including a body,

The body has a base in the shape of a square prism, and a plurality of the bases are arranged in an array at intervals;

The four corners of the lower bottom surface of the base are provided with connection holes; the four sides of the base are respectively provided with side holes, and the heights of all the side holes are the same; the center position of the top of the base is set There is a top hole; the vertical extension line of the side hole is located in the middle of the vertical extension line of the connecting hole and the vertical extension line of the top hole;

The base located at the two side edges of the body has auxiliary electrodes of the same size in the connection hole, the side hole and the top hole; the connection holes of the other bases, the Both the side holes and the top holes are provided with nozzles of the same size.

Preferably, all the bases have the same size.

Preferably, the distance between any two adjacent bases is the same.

Preferably, the size of the auxiliary electrode is the same as that of the nozzle.

Preferably, the distance between the upper bottom surface and the lower bottom surface of the base is 1mm-10mm, the inner diameter of the nozzle is 0.5mm-2mm, and the length of the nozzle is 10mm-40mm.

Preferably, the inside of the body has a solution channel, the surface of the body has a liquid inlet connected to the solution channel; the inside of the nozzle has a liquid outlet chamber connected to the liquid inlet.

The present invention also provides an electrospinning device, comprising the regular quadrangular truss nine-nozzle interval array nozzle with auxiliary electrodes as described in any one of the above.

Preferably, the top of the nozzle has an accommodating head for containing the spinning solution; above the nozzle, there is an inductive magnetic field that can generate an induced magnetic field with the nozzle, and collect the fibers formed by the jet of spinning solution under the action of the induced magnetic field. collection device.

Preferably, the distance between the collecting device and the lower bottom surface of the base is 120mm-220mm.

With respect to the above-mentioned background technology, the positive quadrangular platform nine-nozzle spaced array spray head with auxiliary electrodes for electrospinning equipment provided by the present invention has a regular quadrangular platform-shaped base, and multiple bases are arranged in a spaced array; the base The four top corners of the bottom surface are provided with connecting holes; the four sides of the base are respectively provided with side holes, and the height of all the side holes is the same; the top center of the base is provided with a top hole; the vertical holes of the side holes are The extension line is located in the middle of the vertical extension line of the connection hole and the vertical extension line of the top hole; the base located on the two sides of the body has auxiliary electrodes with the same size in the connection hole, side hole and top hole; the rest of the base The connecting hole, the side hole and the top hole of the seat are all provided with nozzles of the same size.

That is, the heights of the auxiliary electrodes or nozzles located on the upper bottom of the same base are the same, the heights of the four auxiliary electrodes or the four nozzles located on the lower bottom of the same base are the same, and the four auxiliary electrodes or nozzles located on the side of the same base are of the same height. The heights of the four nozzles are the same; for the same base, the auxiliary electrodes or nozzles located on the upper bottom, the side, and the lower bottom have different heights. There are three heights, and all the auxiliary electrodes have the same size, and the size of all the nozzles The same; the positive quadrangular platform nine nozzle spaced array nozzle with auxiliary electrodes set up in this way has small differences in the electric field intensity of each nozzle, more uniform electric field at the tip, and has the outstanding advantage of having more needles per unit area.

The electrospinning equipment provided by the present invention has the above-mentioned beneficial effects, which will not be repeated here.

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 It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic diagram of a regular quadrangular platform with nine nozzle interval array nozzles arranged in three rows of linear arrays with auxiliary electrodes in the prior art;

Fig. 2 is a schematic diagram of a regular quadrangular platform nine nozzle spaced array nozzle with auxiliary electrodes arranged in a projection spaced array with rectangular endpoints on the plane in the prior art;

Fig. 3 is the front view of the positive quadrangular truss nine-nozzle spaced array nozzle of the electrospinning belt auxiliary electrode provided by the embodiment of the present invention;

Fig. 4 is the side view of the positive quadrangular platform nine nozzle interval array nozzles of the electrospinning belt auxiliary electrode in Fig. 3;

Fig. 5 is a top view of the positive quadrangular platform nine-nozzle spacing array nozzle of the electrospinning belt auxiliary electrode in Fig. 3;

Fig. 6 is a side view of the positive quadrangular truss nine-nozzle spaced array nozzle and the collecting device of the electrospinning belt auxiliary electrode provided by the embodiment of the present invention;

Fig. 7 is the schematic diagram of electric field simulation result in Fig. 1;

Fig. 8 is the schematic diagram of electric field simulation result in Fig. 2;

FIG. 9 is a schematic diagram of the electric field simulation results in FIG. 3 .

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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 order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 1 to Fig. 9, Fig. 1 is a schematic diagram of a regular quadrangular platform with nine nozzle interval array nozzles arranged in three rows of linear arrays with auxiliary electrodes in the prior art; Fig. 2 is a rectangular end point in the prior art on the plane The schematic diagram of the projection interval array arrangement of the positive quadrangular platform nine nozzle spacing array nozzles with auxiliary electrodes; Fig. 3 is the front view of the positive quadrangular platform nine nozzle spacing array nozzles of the electrospinning with auxiliary electrodes provided by the embodiment of the present invention; Fig. 4 is a side view of the regular quadrangular platform nine-nozzle spacing array nozzle with auxiliary electrodes in Fig. 3; Fig. 5 is a top view of the regular quadrangular platform nine-nozzle spacing array nozzles with electrospinning electrospinning band auxiliary electrodes in Fig. 3; Fig. 6 The side view of the positive quadrangular table nine nozzle spacing array nozzle and the collecting device of the electrospinning belt auxiliary electrode provided by the embodiment of the present invention; Fig. 7 is a schematic diagram of the electric field simulation result in Fig. 1; Fig. 8 is the electric field in Fig. 2 Schematic diagram of simulation results; FIG. 9 is a schematic diagram of electric field simulation results in FIG. 3 .

The present invention provides a regular quadrangular platform nine-nozzle spacing array nozzle with auxiliary electrodes for electrospinning equipment, including a body, and the body can be regarded as the benchmark of the regular quadrangular platform nine-nozzle spacing array nozzle with auxiliary electrodes; the body Can be in blocks, strips or other shapes.

The body has a base 1, which is in the shape of a square truss. The base 1 in the shape of a regular truss should have an upper bottom and a lower bottom, and there should be a certain height difference between the upper bottom and the lower bottom.

A plurality of bases 1 are arranged in an array at intervals; that is, there is a certain gap between any two adjacent bases 1, and the array arrangement means that a plurality of bases 1 are arranged on the body along the horizontal and vertical directions; that is, , the body is provided with multiple rows and columns of bases 1 .

The four top corners of the bottom surface of the base 1 are provided with connecting holes, and the four sides of each base 1 are respectively provided with side holes, and the heights of all the side holes are the same; the top center of the base 1 is provided with a top Hole, the vertical extension line of the side hole is located in the middle of the vertical extension line of the connecting hole and the vertical extension line of the top hole.

In the present invention, the upper bottom surface of the square pedestal is a square with a side length of 4.63mm, the bottom surface of the square pedestal is a square with a side length of 15mm, and the height of the square pedestal is 3.25mm; At the intersection of the plane where the bottom surface of the platform is 2.35mm and the four sides of the four-sided platform, to ensure that the vertical extension line of the side hole is in the middle of the vertical extension line of the connection hole and the vertical extension line of the top hole.

For the base 1 located on both sides of the body, the nine holes of the base 1 are provided with auxiliary electrodes 7 of the same size; Nozzle 2.

For all bases 1 of the body, the shape and size of all bases 1 are the same; that is, the dimensions of the regular square prism are the same; The height of the auxiliary electrode 7 is the same as that of the nozzle 2, and the height of the auxiliary electrodes 7 on all sides of the base 1 is the same as that of the nozzle 2; that is, there are three different heights for all the bases 1 located on the body, and the three heights are respectively located on the base The upper bottom surface, side edges and lower bottom surface of seat 1 are as shown in accompanying drawings 3 and 5 of the specification.

The base 1 with the nozzle 2 can be regarded as the output structure, and the base 1 with the auxiliary electrode 7 can be regarded as the electrode structure; for the output structure, the nine connecting holes of the base 1 are respectively connected to the nozzle 2, and the accompanying drawing 3 of the specification It coincides with the position of the connection hole and the nozzle 2 in the accompanying drawing 4, and the connection hole is not shown.

In the accompanying drawing 5 of the specification, the projection of all output structures on the horizontal plane constitutes a linear array of two concentric squares at multiple intervals; among them, the vertices 32 and 37 are the projection points of the connecting holes opposite to the two sets of output structures. , the distance between the vertex 32 and the vertex 37 is the distance between adjacent output structures.

In the above, the nozzle 2 can be a needle nozzle, and the end of the needle nozzle 2 away from the connection hole is a needle point structure. This kind of needle nozzle 2 is a regular quadrangular truss nine nozzle spaced array nozzle structure with auxiliary electrodes commonly used in the field. This will not be described in detail. The needle nozzles 2 of each group of output structures are all of the same height, and the needle nozzles 2 of different groups of output structures are also of the same height.

In the present invention, the distance between any two adjacent bases 1 is the same, and multiple bases 1 are evenly distributed on the body, which further ensures the uniformity of the electric field at the tip and is beneficial to increase the number of nozzles 2 per unit area.

The distance between the upper bottom surface and the lower bottom surface of the base 1 is 1.5mm-2.5mm, the inner diameter of the nozzle 2 is 0.5mm-2mm, and the length of the nozzle 2 is 10mm-40mm. The inside of the body has a solution channel, and the surface of the body has a liquid inlet connected to the solution channel; the inside of the nozzle 2 has a liquid outlet chamber connected to the liquid inlet.

As shown in Figure 5 of the specification, the projections of the connection holes of the same group of output structures or electrode structures on the horizontal plane are respectively at the endpoints of two concentric squares, that is, the tracks of the nine holes on the projection plane form two concentric square. This arrangement structure is more conducive to ensuring the uniformity of the electric field at the tip, and at the same time, it is beneficial to increasing the number of needles per unit area.

More preferably, each group of output structures and the projected geometric concentricity of the electrode structures are located on the same straight line. As shown in FIG. 5 of the specification, each group of output structures and electrode structures is symmetrical about the center point 31 from a microscopic point of view. Macroscopically, each group of output structures and electrode structures is symmetrical about the line segment 36 . The vertex 32 and the projection point 33 are respectively located on two sides of the line segment 36 and take the line segment 36 as an axis of symmetry. Similarly, the projection point 34 and the projection point 35 are respectively located on both sides of the line segment 36 and take the line segment 36 as the axis of symmetry. This arrangement structure is more conducive to ensuring the uniformity of the tip electric field and increasing the number of needles per unit area.

The electrospinning equipment provided by the present invention has a regular quadrangular platform with nine nozzles spaced array nozzles with auxiliary electrodes, including the regular quadrangular platform nine nozzles spaced array nozzles with auxiliary electrodes described in the above specific embodiments; electrospinning For other parts of the equipment, reference may be made to the prior art, which will not be expanded in this article.

In the present invention, the top of the nozzle 2 has an accommodating head for containing the spinning solution; the top of the nozzle 2 is provided with a collection device capable of generating an induced magnetic field with the nozzle 2 and collecting the fibers formed by the jet of the spinning solution under the action of the induced magnetic field. device 4. The distance between the collecting device 4 and the lower bottom surface of the base 1 is 120mm-220mm.

During the working process of the above-mentioned electrospinning equipment, the spinning solution is evenly coated on each needle nozzle 2 through an external coating device, the body is fixed relative to the collection device 4, and the needle nozzle 2 Above is the collection device 4 , the spinning liquid generates an induced jet under the induced electric field formed by the needle nozzle 2 and the collection device 4 , and the induced jet is induced to the collection device 4 to form fibers.

In other implementations of the positive quadrangular platform nine-nozzle interval array spray head with auxiliary electrodes in electrospinning, the nozzle 2 may have a hollow liquid outlet cavity, which passes through the front and back of the needle nozzle 2, and the surface of the body has a liquid inlet hole. There is a solution channel inside, and the liquid outlet chamber is connected to the liquid inlet through the corresponding connection hole and the solution channel. At this time, the connection hole can be regarded as a spray hole.

The electrospinning method using this preferred example is as follows:

The main body is fixed relative to the collection device 4, and a collection device 4 is provided above the nozzle 2. The spinning solution generates an induced jet under the induced electric field formed by the needle nozzle 2 and the collection device 4, and the induced jet is induced to the collection device. The device 4 forms fibers, and the spinning method and spinning structure can continuously and uninterruptedly carry out spinning in large quantities.

In the following, through the electric field simulation, the electrospinning with auxiliary electrodes in the regular quadrangular truss nine-nozzle spacing array nozzle and the regular square prism with auxiliary electrodes arranged in a linear array on the plane and arranged in a regular quadrangular truss end point projection array on the plane are compared. Taijiu Nozzle Interval Array nozzles were used for comparison.

The simulation parameters are as follows: the diameter of the needle nozzle 2 is 1mm, the length is 20mm, and the material of the nozzle is copper. In the top view (horizontal projection) as shown in accompanying drawing 5, the distance between adjacent regular square prisms is 15mm, the upper bottom of the regular square prism is a square with side length 4.63mm, and the lower bottom of the regular square prism is a square with side length 15mm. The height of the prism is 3.25mm, and the material of the regular prism is an insulator. The distance between the bottom surface of the square prism and the collection device is 170mm. The collection device is 60mm wide, 160mm long, and 2mm thick. The material is copper. The simulation software is comsol, and the simulation voltage is 30kv. The electric field taken is the electric field at the tip of the nozzle at 0.5 mm.

Compared with the present invention, the arrangement is as shown in accompanying drawing 1 and accompanying drawing 2; accompanying drawing 1 is a schematic diagram of a regular quadrangular truss nine-nozzle interval array nozzle with auxiliary electrodes arranged in three rows of linear arrays on a plane; FIG. 2 is a prior art Schematic diagram of a regular quadrangular truss nine-nozzle spaced array nozzle with auxiliary electrodes arranged in a projected spaced array with rectangular endpoints on the mid-plane.

In accompanying drawing 1, the first nozzle 51 of comparison simulation is arranged in three rows of linear arrays on plane 5; the diameter of first nozzle 51 is 1mm, the height from the end of first nozzle 51 to plane 5 is 20mm, and the distance between adjacent nozzles 15mm, the material is copper. The distance between the top of the first nozzle 51 and the collection device not shown is 150 mm. The collection device is 60 mm wide, 160 mm long, and 2 mm thick. The material is copper. The simulation software is comsol, and the simulation voltage is 30kv. The electric field taken is the electric field at the tip of the nozzle at 0.5 mm.

In accompanying drawing 2, the second nozzle 61 of comparative simulation is arranged as two concentric squares and concentric point arrays on the plane 6, and the trajectory formed by this arrangement is the same as that of the positive quadrangular platform nine nozzle interval array nozzles of the electrospinning belt auxiliary electrode. The graphics formed by the connecting holes on the horizontal projection plane are consistent. The diameter of the second nozzle 61 is 1mm, the nozzle length is 20mm, the side length of the large square in the concentric square is 15mm, the side length of the small square is 7.5mm, the distance between adjacent concentric squares is 15mm, and the material is copper. The distance between the top of the second nozzle 61 and the collection device not shown is 150 mm. The collection device is 160 mm long, 60 mm wide, and 2 mm thick. The material is copper. The simulation software is comsol, and the simulation voltage is 30kv. The electric field taken is the electric field at the tip of the nozzle at 0.5 mm.

FIG. 7 is a schematic diagram of the electric field simulation results in FIG. 1 , FIG. 8 is a schematic diagram of the electric field simulation results in FIG. 2 , and FIG. 9 is a schematic diagram of the electric field simulation results of the present invention.

It can be seen that the difference in electric field intensity between adjacent needle nozzles in Figure 9 is small, and the difference in electric field intensity in each region (curves formed by every two or four peaks as a group) is small; while Figure 7 and Figure 7 In Fig. 8, the difference in electric field intensity between adjacent nozzles is obviously larger than that in Fig. 9. Therefore, the electric field obtained by adopting the positive quadrangular table nine-nozzle spacing array nozzle with the auxiliary electrode of the electrospinning is more uniform, and the number of needles per unit area is doubled.

The electrospinning equipment provided by the present invention and its regular quadrangular truss nine-nozzle interval array nozzle with auxiliary electrodes have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (9)

1. a kind of nozzle pitch array shower nozzle of positive truncated rectangular pyramids nine with auxiliary electrode for electrospinning device, including body, Characterized in that,

The body has the pedestal (1) in positive quadrangular frustum pyramid shaped, and multiple pedestals (1) are arranged in spaced array；

Four drift angles of pedestal (1) bottom surface are equipped with connecting hole；Four sides of the pedestal (1) are respectively equipped with side Hole, all the lateral orifices is highly consistent；Pedestal (1) top center is provided with topped hole；The lateral orifices it is perpendicular Straight extended line is located in the middle of the vertical extended line of the vertical extended line of the connecting hole and the topped hole；

The pedestal (1) positioned at the body both sides of the edge, its described connecting hole, the lateral orifices and the topped hole are equal Provided with size identical auxiliary electrode；The connecting hole of remaining pedestal (1), the lateral orifices and the topped hole are equal Provided with size identical nozzle (2).

2. the positive truncated rectangular pyramids nine nozzle pitch array shower nozzle according to claim 1 with auxiliary electrode, it is characterised in that complete The size of pedestal described in portion (1) is identical.

3. the positive truncated rectangular pyramids nine nozzle pitch array shower nozzle according to claim 2 with auxiliary electrode, it is characterised in that appoint Spacing between two adjacent pedestals (1) of meaning is identical.

4. the positive truncated rectangular pyramids nine nozzle pitch array shower nozzle according to claim 2 with auxiliary electrode, it is characterised in that institute The size for stating auxiliary electrode is identical with the size of the nozzle (2).

5. the positive truncated rectangular pyramids nine nozzle pitch array shower nozzle according to claim 2 with auxiliary electrode, it is characterised in that institute It is 1mm~10mm to state the distance between upper bottom surface and bottom surface of pedestal (1), and the internal diameter of the nozzle (2) is 0.5mm~2mm, The length of the nozzle (2) is 10mm~40mm.

6. the nozzle pitch array shower nozzle of positive truncated rectangular pyramids nine with auxiliary electrode according to Claims 1 to 5 any one, its It is characterised by, the inside of the body has solution channel, and the surface of the body has and entering that the solution channel is connected Liquid mouthful；The inside of the nozzle (2) has and the inlet is connected goes out sap cavity.

7. a kind of electrospinning device, it is characterised in that including as described in any one of claim 1 to 6 with auxiliary electrode The positive nozzle pitch array shower nozzle of truncated rectangular pyramids nine.

8. electrospinning device according to claim 7, it is characterised in that the top of the nozzle (2) has to hold Receive the receiving head of spinning solution；The top of the nozzle (2), which is provided with, can produce induced magnetic field and collect with the nozzle (2) The collection device (4) for the fiber that spinning solution jet is formed under induced magnetic field effect.

9. electrospinning device according to claim 8, it is characterised in that the collection device (4) and the pedestal (1) Spacing between bottom surface is 120mm~220mm.