CN106119992A - The electrostatic spinning nozzle of face of cylinder triangular compartments array and electrospinning process - Google Patents

Abstract

The invention discloses an electrospinning nozzle and an electrospinning method with a triangular array of cylindrical surfaces at intervals. Axisymmetric 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, each connecting hole is connected with a needle nozzle, each needle nozzle along the cylindrical surface The connection holes in the same group of output structures are located at the endpoints of isosceles triangles, where the endpoints of the corners of the isosceles triangles are located on the top line of the cylindrical surface, and the opposite base of the isosceles triangles and the corners are perpendicular to The axis of the cylinder. 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 triangular spaced 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 cylindrical triangular spaced arrays.

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 spaced array on a cylindrical surface, 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 triangular array of cylindrical surfaces at intervals, including a body, the body has a cylindrical surface at the top and at least three sets of output structures, and the adjacent two sets of output structures are axially symmetrical in the direction of the axis of the cylindrical surface And separated by a certain distance, each group of output structures includes three 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 of equal height, the same group Each connection hole in the output structure is located on the endpoint of the isosceles triangle, wherein the endpoint of the vertex of the isosceles triangle is located on the top line of the cylinder, and the opposite base of the isosceles triangle and the apex is perpendicular to the axis of the cylinder.

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 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 effect of the present invention is: the output structures of the adjacent groups of the present invention are arranged axisymmetrically along the axis of the cylindrical surface and separated by a certain distance, and the connection lines of the three connecting holes of each group of output structures form an isosceles triangle trajectory, wherein the isosceles The endpoints of the triangle vertices are located on the top line of the cylinder, and the base of the isosceles triangle is perpendicular to the axis of the cylinder, so the projection points of all the connecting holes on the projection plane form the trajectory of the axisymmetric array of isosceles triangles. This arrangement Compared with the prior art of nozzles arranged in an array track on a plane, the electric field intensity difference of each nozzle is smaller, and the tip electric field 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 cylindrical triangular interval array as shown in Fig. 1 to Fig. 3, comprises body 1, and body 1 has a cylindrical surface at the top and is provided with at least three groups of output structures, and described output structure is used for collecting And spray the spinning solution.

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 three connecting holes are respectively located at the three endpoints of an isosceles triangle, that is, the lines connecting the three connecting holes form an isosceles triangle locus. The endpoint of the said isosceles triangle vertex is located on the top line of the cylinder, that is, one of the connection holes is located on the top line of the cylinder; the base of the isosceles triangle opposite to the vertex is perpendicular to the axis of the cylinder, Thus, the other two connection holes are respectively located symmetrically on both sides of the top line of the cylinder. As shown in FIG. 3 , the projections of the three connection holes on the horizontal plane are respectively located at the endpoints of another isosceles triangle, that is, the trajectory of the isosceles triangle is formed by connecting the three projection points.

In an embodiment, two adjacent sets of output structures are axisymmetric in the axis direction of the cylindrical surface and separated by a certain distance. Specifically, referring to FIG. 3 , each isosceles triangle is a projected locus of a group of connection holes of the output structure. The bases of the adjacent isosceles triangles 21, 22 are opposite, and the two isosceles triangles 21, 22 are separated by a certain distance and are axisymmetric with respect to the axis 23; the vertices of the adjacent isosceles triangles 22, 24 are opposite , and the two isosceles triangles 22 , 24 are separated by a certain distance and are axisymmetric with respect to the axis 25 . By analogy, spaced array tracks are formed on the horizontal projection plane, the units of the array track are isosceles triangles, and adjacent isosceles triangles are symmetrical to each other.

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 connecting holes on the horizontal plane in the same group of output structures are respectively on the endpoints of the regular triangle, that is, the projections of the three connecting holes form a trajectory of a regular triangle, and the center of the regular triangle is on the top line of the cylindrical surface on the horizontal plane on the projection line. This arrangement structure is more conducive to ensuring the uniformity of the electric field at the tip.

Further preferably, the distance between adjacent groups of output structures is actually the distance between adjacent regular triangles on the horizontal projection plane. In Fig. 3, this spacing is the spacing between projection point 31 and projection point 32, also equals the distance between two opposite bases of two isosceles triangles 21,22, and this spacing is the same as the side of equilateral triangle The lengths are equal, and 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 on a plane and in a triangular linear array on a 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 comparative simulation are arranged in a triangular axisymmetric spaced array on the plane 5, and the pattern formed by this arrangement is consistent with the pattern formed by the projection of each connection 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 is the simulation result, the difference in electric field intensity between adjacent needle nozzles in Fig. 9 is small; as shown in Fig. Big. 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 (6)

1. an electrostatic spinning nozzle for face of cylinder triangular compartments 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 three group export structures, two adjacent groups export structure is on the face of cylinder Axial symmetry being spaced a distance on axis direction, each group export structure includes three connecting holes being opened on the face of cylinder, often All being connected to needle nozzle (2) on individual connecting hole, each needle nozzle (2) extends and contour along the normal direction on the face of cylinder, same group of output In structure, each connecting hole is positioned on the end points of isosceles triangle, and wherein the end points of isosceles triangle drift angle is positioned at the top line on the face of cylinder On, the isosceles triangle base vertical relative with drift angle is in the axis on the face of cylinder.

The electrostatic spinning nozzle of the face of cylinder the most according to claim 1 triangular compartments array, it is characterised in that: same group In 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 compartments array, it is characterised in that: adjacent sets The spacing of export structure is equal with the length of side of equilateral triangle.

4. according to the electrostatic spinning nozzle of the face of cylinder triangular compartments 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 according to any one of claim 1 to 3, 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.

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.