CN106167920A - The electrostatic spinning nozzle of face of cylinder triangular shaft symmetric array and electrospinning process - Google Patents

Abstract

The invention discloses an electrospinning nozzle and an electrospinning method with a triangular axisymmetric array of cylindrical surfaces. The axial direction of the cylindrical surface is arranged in a linear array. The latter group of output structures is axisymmetric with respect to the previous group of output structures in the axial direction of the cylindrical surface and separated by a certain distance. Each group of output structures includes three connections on the cylindrical surface. Each connecting hole is connected with a needle nozzle, and each needle nozzle extends along the normal direction of the cylindrical surface and has the same height. The connecting lines of the connecting holes in the same group of output structures form a triangular trajectory, and the connecting holes of the two connecting holes The connecting line segment is parallel to the axis of the cylindrical surface. In the present invention, the electric field intensity difference of each needle type nozzle is small, and the tip electric field of each nozzle is more uniform. The present invention can be applied to electrospinning.

Description

Electrospinning nozzle and electrospinning method with cylindrical triangular axisymmetric array

technical field

The invention relates to the field of electrospinning, in particular to an electrospinning nozzle and an electrospinning method with a rhombus spaced array on a cylindrical surface.

Background technique

The invention patent with the application number 200910031948.2 discloses an array multi-nozzle electrospinning equipment, which uses multiple nozzles arranged in a linear rectangular array on the plane for spinning, which can realize mass production of electrospun fiber membrane materials.

However, after a long period of use, technicians found that when the nozzles are arranged in an array on a plane, the electric fields at the tips of the nozzles will affect and interfere with each other, resulting in large differences in the electric fields between different nozzles, resulting in uneven spinning.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide an electrospinning nozzle with a triangular axisymmetric array on a cylindrical surface, and the electric field at the tip of the nozzle is relatively uniform.

The technical scheme adopted in the present invention is:

An electrospinning nozzle with a cylindrical triangular axisymmetric array, including a body, the body has a cylindrical surface at the top and at least two sets of output structures, each set of output structures is arranged in a linear array along the axis of the cylindrical surface , the latter group of output structures is axisymmetric with respect to the previous group of output structures in the axial direction of the cylindrical surface and separated by a certain distance. Each group of output structures includes three connecting holes opened on the cylindrical surface, and each connecting hole is connected to There are needle nozzles, and each needle nozzle extends along the normal direction of the cylindrical surface and has the same height. The connecting lines of the connecting holes in the same group of output structures form a triangular trajectory, and the connecting line segment of the two connecting holes is parallel to the axis of the cylindrical surface .

As a further improvement of the present invention, the projections of the connecting holes on the horizontal plane in the same group of output structures are located on the endpoints of the equilateral triangles.

As a further improvement of the present invention, the center of the equilateral triangle is located on the projection line of the top line of the cylindrical surface on the horizontal plane.

As a further improvement of the present invention, the distance between adjacent groups of output structures is equal to the side length of a regular triangle.

The present invention also provides a kind of electrospinning method, and the technical scheme that it adopts is:

Using the above-mentioned electrospinning nozzle, the spinning liquid is coated on each needle nozzle, and the spinning liquid generates an induced jet under the induced electric field formed by the needle nozzle and the collecting device, and the induced jet is induced to the collecting device to form a fiber .

In addition, the electrospinning nozzle of the present invention can also adopt the following structure:

The needle nozzle has a hollow liquid outlet chamber, the surface of the body has a liquid inlet, and the inside of the body has a solution channel, and the liquid outlet chamber is connected to the liquid inlet through corresponding connection holes and solution channels.

The electrospinning method of the electrospinning nozzle is as follows:

The spinning solution is injected into the outlet cavity through the solution channel and reaches the top of the needle nozzle. The spinning solution generates an induced jet under the induced electric field formed by the needle nozzle and the collecting device, and the induced jet is induced to the collecting device to form fibers.

The beneficial effects of the present invention are: each group of output structures of the present invention is arranged in a linear array along the axial direction of the cylindrical surface, the connecting lines of the three connecting holes of each group of output structures form a triangular trajectory, and the connecting line segments of the two connecting holes Parallel to the axis of the cylindrical surface, the line connecting the projection points of each connecting hole on the projection surface forms a triangular axisymmetric array trajectory. Compared with the prior art of nozzles arranged in an array trajectory on a plane, The difference in electric field intensity among nozzles is small, and the electric field at the tip of each nozzle is more uniform.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the front view of electrospinning nozzle;

Fig. 2 is a side view of an electrospinning nozzle;

Fig. 3 is the top view of electrospinning nozzle;

Figure 4 is a schematic diagram of the electrospinning process;

Fig. 5 is a schematic diagram of arranging nozzles in three rows of linear arrays on a plane;

Fig. 6 is a schematic diagram of arranging nozzles in a triangular axisymmetric array on a plane;

Fig. 7 is a schematic diagram of the electric field simulation results of the arrangement in Fig. 5;

Fig. 8 is a schematic diagram of the electric field simulation results of the arrangement in Fig. 6;

Fig. 9 is a schematic diagram of the electric field simulation results of the arrangement of the present invention.

detailed description

The electrospinning nozzle of the cylindrical triangular axisymmetric array shown in Figures 1 to 3 includes a body 1, the body 1 has a cylindrical surface at the top and is provided with at least two sets of output structures, and the output structures are used for The spinning dope is collected and sprayed.

Each set of output structure is composed of three connecting holes on the cylindrical surface and needle nozzles 2 respectively connected to the connecting holes. 2 is not marked. The connecting lines of these three connecting holes form a triangular trajectory, that is, the three connecting holes are on the endpoints of a triangle, and the connecting line segments of two connecting holes are parallel to the axis of the cylindrical surface. In other words, by this One of the sides of the triangle formed by the three connecting holes is parallel to the axis of the cylindrical surface. As shown in FIG. 3 , the projections of the three connection holes on the horizontal plane are respectively located at the endpoints of another triangle, that is, the trajectory of the triangle is formed by connecting the three projection points.

In the embodiment, each group of output structures is arranged in a linear array along the axis of the cylindrical surface, and the latter group of output structures is axisymmetric with respect to the previous group of output structures in the axial direction of the cylindrical surface and separated by a certain distance, thus, The array arrangement of a plurality of axisymmetric triangles in the axial direction of the cylindrical surface is formed, and at the same time, the projection of each output structure on the horizontal plane forms a linear array pattern of a plurality of spaced axisymmetric triangles. Specifically, referring to FIG. 3 , two adjacent triangles on the above-mentioned horizontal projection plane have an axisymmetric structure with respect to the axis 33 .

The end of the above-mentioned needle nozzle 2 away from the connecting hole is a needle point structure, and this needle nozzle 2 is a commonly used nozzle structure in the field, and will not be described in detail here. 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, that is, all the needle nozzles 2 are of the same height relative to the cylindrical surface. These needle nozzles 2 extend in the normal direction of the cylindrical surface.

The above-mentioned body 1 may be a complete cylindrical structure so that its surfaces are all cylindrical, or it may be a structure in which only a part has cylindrical surfaces.

The electrospinning nozzle with the above connection holes and needle nozzle tracks can greatly reduce the mutual influence of the electric fields of each needle nozzle, making the tip electric field of each needle nozzle more uniform.

Preferably, the projections of the connection holes in the same group of output structures on the horizontal plane are respectively located at the endpoints of the regular triangle. That is, the projections of the three connection holes constitute a regular triangle locus. This arrangement structure is more conducive to ensuring the uniformity of the electric field at the tip.

Further preferably, the projection line of the top line of the cylindrical surface on the horizontal plane is a straight line parallel to the axis, and the center of the regular triangle on the above-mentioned projection plane is located on the projection line, that is, each group of output structure connection holes is on the horizontal projection plane The connecting line of the centers of the equilateral triangle projection locus coincides with the above-mentioned projection line.

Further preferably, the distance between adjacent groups of output structures is actually the distance between adjacent regular triangles on the horizontal projection plane. As shown in FIG. 3, the distance is the distance d between the projection point 31 and the projection point 32, which The spacing d is equal to the side lengths of the regular triangles, and this arrangement is more conducive to ensuring the uniformity of the electric field at the tip.

The electrospinning method of above-mentioned embodiment is as follows:

As shown in Figure 4, the spinning solution is evenly coated on each needle nozzle 2 through an external coating device, the body 1 is fixed relative to the collection device 4, and the needle nozzle 2 faces the collection device 4, The spinning solution generates an induced jet under the induced electric field formed by the needle nozzle 2 and the collecting device 4, and the induced jet is induced to the collecting device 4 to form fibers.

In other embodiments of the electrospinning nozzle, the needle nozzle 2 may have a hollow liquid outlet chamber, the liquid outlet chamber passes through the front and rear of the needle nozzle 2, has a liquid inlet on the surface of the body 1, and has a solution channel inside the body 1, 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 embodiment is as follows:

As shown in Figure 4, the main body 1 is fixed relative to the collection device 4, and the needle nozzle 2 is facing the collection device 4, and the spinning solution is injected into the outlet chamber through the solution channel and reaches the top of the needle nozzle 2, and the spinning solution The silk liquid generates an induced jet under the induced electric field formed by the needle nozzle 2 and the collecting device 4, and the induced jet is induced to the collecting device 4 to form fibers. This spinning method and spinning structure can continue spinning without interruption.

The electrospinning nozzles in the embodiment are compared with the nozzles arranged in a linear array on the plane and the nozzles arranged in a triangular spaced axisymmetric array on the plane through electric field simulation.

The simulation parameters are as follows: the diameter of the needle nozzle 2 is 2 mm, the height from the end of the nozzle to the cylindrical surface is 15 mm, in the top view (horizontal projection) shown in Figure 3, the distance between adjacent nozzle projection points is 20 mm, and the material of the nozzle is stainless steel , the diameter of the cylindrical surface is 100mm, the length is 220mm, and the material is stainless steel. The distance between the top line of the cylindrical surface and the collection device is 115mm. The collection device is 180mm wide, 240mm long, and 2mm thick. The material is aluminum. The simulation software is comsol, and the simulation voltage is 50kv. The electric field taken is the electric field at 1 mm from the tip of the nozzle.

The nozzles 61 of the comparison simulation are arranged in three rows of linear arrays on the plane 6, as shown in FIG. 5 . The diameter of the nozzle 61 is 2 mm, the height from the end of the nozzle to the plane 6 is 15 mm, the distance between adjacent nozzles is 20 mm, and the material is stainless steel. The top of the nozzle 61 is 100 mm away from the collection device not shown in the figure. The collection device is 180 mm wide, 240 mm long, and 2 mm thick. The material is aluminum. The simulation software is comsol, and the simulation voltage is 50kv; the electric fields taken are the electric fields at 1mm of the nozzle tip.

As shown in Fig. 6, the nozzles 51 of the comparison simulation are arranged in a triangular symmetrical spaced array on the plane 5, and the pattern formed by this arrangement is consistent with the pattern formed by the projection of each connecting hole of the electrospinning nozzle on the horizontal projection plane. The diameter of the nozzle 51 is 2 mm, the height from the end of the nozzle to the plane 5 is 15 mm, the distance between adjacent nozzles is 20 mm, and the material is stainless steel. The top of the nozzle 51 is 100mm away from the collecting device which is not shown. The collecting device is 180mm wide, 240mm long, and 2mm thick. The material is aluminum. The simulation software is comsol, and the simulation voltage is 50kv; the electric fields taken are the electric fields at 1mm of the nozzle tip.

Comparing Fig. 7, Fig. 8 and Fig. 9 are the simulation results. In Fig. 9, the difference of electric field intensity of adjacent needle nozzles is small, and the difference of electric field strength of each region (curves formed by a group of three peaks) is relatively small. small; as shown in Figure 7 and Figure 8, the difference in electric field intensity between adjacent nozzles is significantly larger than that in Figure 9. Therefore, the electric field obtained by using the electrospinning nozzle of this embodiment is more uniform.

The above descriptions are only preferred embodiments of the present invention, and do not constitute a limitation to the protection scope of the present invention.

Claims (7)

1. an electrostatic spinning nozzle for face of cylinder triangular shaft symmetric array, including body (1), it is characterised in that: described Body (1) has the face of cylinder being positioned at top and is provided with at least two group export structures, and each group export structure is along the axle on the face of cylinder Line direction linearly array is arranged, later group export structure is relative to the previous group export structure axis direction upper shaft on the face of cylinder Symmetry is also spaced a distance, and each group export structure includes three connecting holes being opened on the face of cylinder, on each connecting hole all Being connected to needle nozzle (2), each needle nozzle (2) extends and contour along the normal direction on the face of cylinder, respectively connects in same group of export structure The triangle track of line in hole, the line section of two of which connecting hole is parallel with the axis on the face of cylinder.

The electrostatic spinning nozzle of the face of cylinder the most according to claim 1 triangular shaft symmetric array, it is characterised in that: same In group export structure, the projection in the horizontal plane of each connecting hole is respectively on the end points of equilateral triangle.

The electrostatic spinning nozzle of the face of cylinder the most according to claim 2 triangular shaft symmetric array, it is characterised in that: described Equilateral triangle is centrally located on the top line on face of cylinder projection line in the horizontal plane.

The electrostatic spinning nozzle of the face of cylinder the most according to claim 2 triangular shaft symmetric array, it is characterised in that: adjacent The spacing of group export structure is equal with the length of side of equilateral triangle.

5. according to the electrostatic spinning nozzle of the face of cylinder triangular shaft symmetric array described in claim 1 or 2 or 3 or 4, its feature Being: described needle nozzle (2) has the sap cavity that of hollow, described body (1) surface has inlet, the internal tool of body (1) Have solution channel, described in go out sap cavity by corresponding connecting hole, solution channel connection inlet.

6. an electrospinning process, it is characterised in that: use the electrostatic spinning nozzle according to any one of claim 1 to 4, Being coated on by spinning liquid on each needle nozzle (2), spinning liquid is under the induction electric field that needle nozzle (2), collection device are formed Producing induced jet, induced jet is induced to collection device and forms fiber.

7. an electrospinning process, it is characterised in that: use the electrostatic spinning nozzle described in claim 5, spinning liquid is led to Crossing in solution channel injects sap cavity and arrive needle nozzle (2) top, spinning liquid is in needle nozzle (2), collection device institute shape Producing induced jet under the induction electric field become, induced jet is induced to collection device and forms fiber.