CN106167921A - The electrostatic spinning nozzle of face of cylinder tetragon symmetric array and electrospinning process - Google Patents

Abstract

The invention discloses an electrospinning nozzle and an electrospinning method with a quadrilateral symmetrical array on a cylindrical surface. The axial direction of the surface is arranged in a linear array. Each group of output structures includes four connecting holes opened on the cylindrical surface. Each connecting hole is connected with a needle nozzle. Each needle nozzle extends along the normal direction of the cylindrical surface and is equal to High, the projections of the connecting holes on the horizontal plane in the same group of output structures are respectively on the endpoints of the rhombus, the latter group of output structures is symmetrical to the previous group of output structures in the axis direction of the cylindrical surface, and adjacent groups of output structures share one The connecting hole thus serves as the center of symmetry for the two sets of output structures. 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 quadrilateral symmetrical array on cylindrical surface

technical field

The invention relates to the field of electrospinning, in particular to an electrospinning nozzle and an electrospinning method with a cylindrical quadrilateral symmetrical array.

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 purpose of the present invention is to provide an electrospinning nozzle with a cylindrical quadrilateral symmetrical array, and the tip electric field of the nozzle is relatively uniform.

The technical scheme adopted in the present invention is:

An electrospinning nozzle with a cylindrical tetragonal symmetrical 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, Each group of output structures includes four connecting holes opened on the cylindrical surface, each connecting hole is connected with a needle nozzle, each needle nozzle extends along the normal direction of the cylindrical surface and has the same height, each connection in the same group of output structures The projections of the holes on the horizontal plane are respectively at the endpoints of the rhombus. The latter group of output structures is symmetrical to the previous group of output structures in the axis direction of the cylindrical surface. The adjacent groups of output structures share a connecting hole so that the connecting holes are used as two groups. The center of symmetry of the output structure.

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 respectively located at the endpoints of the square.

As a further improvement of the present invention, the connecting holes shared by adjacent groups of output structures are located on the top line of the cylindrical surface.

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, and the projections of the four connection holes of each group of output structures on the horizontal plane are respectively on the endpoints of the rhombus, so each connection hole is in The line connecting the projected points on the projection plane forms a locus of a rhombus symmetrical array. Compared with the prior art of nozzles arranged in an array locus on a plane, the difference in the electric field intensity of each nozzle is small, and the tip electric field of each nozzle 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 rhombus symmetrical 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 present invention.

detailed description

The electrospinning nozzle of the quadrilateral cylindrical symmetrical array shown in Fig. 1 to Fig. 3 comprises a body 1, and 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 collecting and Jet spinning solution.

Each set of output structure is composed of four connecting holes on the cylindrical surface and needle nozzles 2 respectively connected to the connecting holes. 2 is not marked. As shown in FIG. 3 , the projections of the four connection holes on the horizontal plane are respectively located at the end points of the rhombus, that is, the trajectory of the rhombus is formed by connecting the projected 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 symmetrical to the previous group of output structures in the axial direction of the cylindrical surface, and adjacent groups of output structures share a connection The hole 31 and thus the connection hole 31 serve as the center of symmetry for the two sets of output structures. Then, the projections of the connection holes of all the output structures on the horizontal plane constitute a linear array pattern of multiple rhombuses, and adjacent rhombuses on the projection plane share a projection point 31 , that is, the projection points overlap. It should be noted that the centers of symmetry of the output structures of adjacent groups are located on the vertex line of the cylindrical surface.

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, as shown in FIG. 3 , the projections of the connection holes on the horizontal plane in the same group of output structures are located at the endpoints of the square respectively, that is, the trajectories of the four connection holes on the projection plane form a square. This arrangement structure is more conducive to ensuring the uniformity of the electric field at the tip.

In addition, more preferably, the connecting holes shared by adjacent groups of output structures are located on the top line of the cylindrical surface. From FIG. 3 , the line segment 32 is the axis of the rhombus projection trajectory of one group of output structures on the horizontal projection plane, and the line segment 32 passes through the projection point 31 shared by the two rhombus shapes. The projection point 33 and the projection point 34 are respectively located on both sides of the line segment 32 and take the line segment 32 as an axis of symmetry. It is not difficult to understand that the projection of the top line of the cylindrical surface on the horizontal plane coincides with the line segment 32, then the connecting hole corresponding to the projection point 31 will be on the top line of the cylindrical surface, and the two corresponding projection points 33 and 34 The two connecting holes are symmetrical on both sides of the top line of the cylinder. This arrangement structure 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 and a quadrilateral symmetrical array in 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 Figure 6, the nozzles 51 of the comparison simulation are arranged in a rhombus symmetrical array on the plane 5, and its center of symmetry is a vertex of the rhombus, and the trajectory formed by this arrangement is on the horizontal projection plane with each connecting hole of the electrospinning nozzle The graphics formed on the upper projection are consistent. 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 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.

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 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 (6)

1. an electrostatic spinning nozzle for face of cylinder tetragon symmetric array, including body (1), it is characterised in that: described body (1) having the face of cylinder being positioned at top and be provided with at least two group export structures, each group export structure is along the axis on the face of cylinder Direction linearly array is arranged, each group export structure includes four 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 Hole projection in the horizontal plane is respectively on the end points of rhombus, and later group export structure is being justified relative to previous group export structure Symmetry on the axis direction of cylinder, adjacent sets export structure shares a connecting hole thus this connecting hole is as two groups of export structures Symmetrical centre.

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

The electrostatic spinning nozzle of the face of cylinder the most according to claim 1 tetragon symmetric array, it is characterised in that: adjacent sets The connecting hole that export structure shares is positioned on the top line on the face of cylinder.

4. according to the electrostatic spinning nozzle of the face of cylinder tetragon symmetric array described in claim 1 or 2 or 3, it is characterised in that: Described needle nozzle (2) has the sap cavity that of hollow, and described body (1) surface has inlet, and body (1) is internal has solution Passage, described in go out sap cavity by corresponding connecting hole, solution channel connection inlet.

5. an electrospinning process, it is characterised in that: use the electrostatic spinning nozzle described in claim 1 or 2 or 3, will spin Silk liquid is coated on each needle nozzle (2), and spinning liquid produces under the induction electric field that needle nozzle (2), collection device are formed Induced jet, induced jet is induced to collection device and forms fiber.

6. an electrospinning process, it is characterised in that: use the electrostatic spinning nozzle described in claim 4, 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.