Liftable free liquid surface spinning device for mass production of oriented fibers

Abstract

The present application relates to a free liquid surface spinning device for preparing oriented fibers in large quantities, which can be lifted and lowered, and includes: a liquid storage mechanism for placing a spinning solution; a grid lifting mechanism, which is at least partially arranged in the liquid storage mechanism and can move up and down along the liquid storage mechanism; a high-voltage electrostatic generator, which is electrically connected to the grid lifting mechanism and the liquid storage mechanism; the grid lifting mechanism includes a grid arranged in the liquid storage mechanism, and a lifting component arranged on one side of the liquid storage mechanism and used to drive the grid to move up and down, and the grid has a plurality of protruding nodes. By providing a grid lifting mechanism, it can move up and down along the liquid storage mechanism, and then can drive the fluidity of the spinning solution in the liquid storage mechanism, so as to achieve the characteristics of reducing the viscosity of the spinning solution and improving the dispersion of the polymer; at the same time, when the grid lifting mechanism extends from the spinning liquid surface, it can break the surface tension of the spinning liquid surface, so that the spinning solution is stretched under the action of the electrostatic field to produce a large number of fibers.

Description

Technical Field

[0001] The invention relates to a free liquid surface spinning device capable of being lifted and lowered and used for preparing oriented fibers in large quantities, belonging to the technical field of free liquid surface spinning. Background Art

[0002] Free surface electrospinning is a new spinning process. The principle of co-spinning is similar to that of bubble electrospinning. It uses the electrostatic force provided by the high-voltage electric field to overcome the surface tension of the polymer liquid surface, form a Taylor cone on the polymer liquid surface, and further form a jet. The jet is stretched into nanofibers under the action of the electric field force. Because there is no involvement of bubbles in this process, the shortcomings of bubble electrospinning, such as uncontrollable bubble size, irregular bubble rupture, and uneven fiber diameter distribution caused by this, are overcome. At the same time, the advantage of high yield of bubble electrospinning is preserved. However, in the free surface spinning process, the surface tension only exists on the liquid storage device. Under the action of high-voltage static electricity, the surface tension is overcome, and the fibers produced are not enough. In view of the above technical problems, in order to prepare more correct fibers in batches and improve the spinning efficiency, the liquid storage device is improved to provide more areas with surface tension, so that more fibers can be produced. In addition, due to the requirements of oriented structures on the microstructure of products in some fields, the need to produce large quantities of fiber membranes with oriented structures is also a hot spot and difficulty. Summary of the invention

[0003] The object of the present invention is to provide a free liquid surface spinning device that can be raised and lowered for mass production of oriented fibers, which can realize mass production of nanofibers and fiber membranes with oriented structures.

[0004] To achieve the above object, the present invention provides the following technical solution: a free liquid surface spinning device for preparing oriented fibers in large quantities in a liftable manner, comprising:

[0005] A liquid storage mechanism, used for placing a spinning solution;

[0006] A grid lifting mechanism, at least partially disposed in the liquid storage mechanism and movable up and down along the liquid storage mechanism;

[0007] A high-voltage electrostatic generator is electrically connected to the grid lifting mechanism and the liquid storage mechanism;

[0008] The grid lifting mechanism comprises a grid arranged in the liquid storage mechanism, and a lifting component arranged at one side of the liquid storage mechanism and used for driving the grid to move up and down, and the grid has a plurality of protruding nodes.

[0009] Furthermore, in the height direction of the free liquid surface spinning device, the diameters of the plurality of raised nodes increase sequentially from top to bottom.

[0010] Furthermore, a plurality of the raised nodes are in the shape of needle tips.

[0011] Furthermore, the grid is a rectangular grid, and a plurality of raised nodes are distributed in parallel on the rectangular grid.

[0012] Furthermore, the lifting component is a lift.

[0013] Furthermore, the mesh is made of conductive metal.

[0014] Furthermore, the free liquid surface spinning device also includes a receiving mechanism arranged on one side of the liquid storage mechanism.

[0015] Furthermore, the receiving mechanism includes a roller and a motor for driving the roller to rotate, and the roller is grounded.

[0016] Furthermore, the free liquid surface spinning device also includes a constant flow liquid supply mechanism for supplying liquid to the liquid storage mechanism, and the constant flow liquid supply mechanism is connected to the liquid storage mechanism through a liquid conduit.

[0017] The beneficial effects of the present invention are as follows: by providing a grid lifting mechanism, it can move up and down along the liquid storage mechanism, thereby driving the fluidity of the spinning solution in the liquid storage mechanism, thereby achieving the characteristics of reducing the viscosity of the spinning solution and improving the dispersion of the polymer; at the same time, when the grid lifting mechanism extends from the spinning liquid surface, the surface tension of the spinning liquid surface can be broken, thereby allowing the spinning solution to be stretched under the action of the electrostatic field to produce a large number of fibers;

[0018] By arranging a plurality of raised nodes on the grid, the raised nodes are conducive to the generation of tip discharge, and further conducive to the generation of fibers, so as to achieve the effect of improving the spinning efficiency.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the liftable free liquid surface spinning device for preparing oriented fibers in large quantities according to the present invention.

[0021] Figure 2 for Figure 1 Schematic diagram of some structures in . DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] See also Figure 1 and Figure 2 , a free liquid surface spinning device for preparing oriented fibers in large quantities in a preferred embodiment of the present invention comprises a liquid storage mechanism 5, a grid lifting mechanism, a high-voltage electrostatic generator 7 and a receiving mechanism 1. Among them, the liquid storage mechanism 5 is used to place the spinning solution, at least part of the grid lifting mechanism is arranged in the liquid storage mechanism 5 and can move up and down along the liquid storage mechanism 5, the high-voltage electrostatic generator 7 is electrically connected to the grid lifting mechanism and the liquid storage mechanism 5, and the receiving mechanism 1 is grounded 2. In this embodiment, the liquid storage mechanism 5 is a liquid storage tank, and the receiving mechanism 1 is arranged above the liquid storage tank to better receive the final formed fiber. Of course, in other embodiments, the receiving mechanism 1 can also be arranged at other positions of the liquid storage mechanism 5, depending on the actual situation, and no specific limitation is made here. As mentioned above, the liquid storage mechanism 5 is connected to the high-voltage electrostatic generator 7, and accordingly, the material of the liquid storage tank is a conductive metal, which can be iron, copper, etc., and no specific limitation is made here, depending on the actual situation.

[0024] In order to better receive the finally formed nanofibers and improve the quality of the nanofiber membrane, the receiving mechanism 1 includes a roller and a motor for driving the roller to rotate. The roller is grounded 2 so that an electrostatic field is formed between the liquid storage mechanism 5 and the receiving mechanism 1.

[0025] The grid lifting mechanism includes a grid 3 disposed in the liquid storage mechanism 5, and a lifting assembly 4 disposed on one side of the liquid storage mechanism 5 and used to drive the grid 3 to move up and down. The grid 3 is connected to the lifting assembly 4 through a connector. Specifically, the high-voltage electrostatic generator 7 is electrically connected to the connector to be electrically connected to the grid 3, so that an electrostatic field is also formed between the grid 3 and the receiving mechanism 1. In this embodiment, the material of the grid 3 and the connector is also a conductive metal, and the conductive metal is copper or iron, etc., which is not specifically limited here and depends on the actual situation.

[0026] Among them, the grid 3 has a number of raised nodes 31. In the height direction of the free liquid surface spinning device, the diameters of the several raised nodes 31 increase from top to bottom. In the present embodiment, several of the raised nodes 31 are needle-shaped. The needle-shaped raised nodes 31 are conducive to the generation of tip discharge, which is more conducive to the generation of fibers, so as to greatly improve the spinning efficiency. Of course, in other embodiments, the shape of the raised nodes 31 can also be other, which is not specifically limited here, depending on the actual situation. The grid 3 is a rectangular grid 3, and several raised nodes 31 are distributed in parallel on the rectangular grid 3, so that the fibers can also be generated in parallel during the stretching process, so that when the fibers are received by the drum, a large number of fibers with oriented structures can be better obtained. Of course, in other embodiments, the shape of the grid 3 can also be other, as long as the above-mentioned corresponding purposes are achieved, which is not specifically limited here, depending on the actual situation. The number of raised nodes 31 depends on the actual situation, and it is necessary to avoid setting too many and interacting with the electric field to reduce the spinning efficiency.

[0027] The lifting assembly 4 is a lift, which is a conventional structure and will not be described in detail here. The lift is used to drive the grid 3 to move up and down. In this embodiment, the distance that the grid 3 moves is one centimeter above and below the spinning liquid surface for better spinning. Of course, in other embodiments, the moving distance of the grid 3 may also be other, but the grid 3 needs to break the tension of the spinning liquid surface during the rising process (that is, the grid 3 needs to move from below the spinning liquid surface to above the spinning liquid surface), and it needs to correspond to the speed at which the solution on the grid 3 is stretched. When it falls back into the spinning solution, the solution on the grid 3 is just stretched. No specific restrictions are made here, depending on the actual situation. The speed of the lift is also set according to the actual spinning requirements, and this embodiment does not specifically limit it. During the lifting and lowering process of the grid 3 by the lift, the spinning solution is also stirred, thereby achieving the effect of improving the spinning efficiency.

[0028] The free liquid surface spinning device further includes a constant flow liquid supply mechanism 6 for supplying liquid to the liquid storage mechanism 5, and the constant flow liquid supply mechanism 6 is connected to the liquid storage mechanism 5 through a liquid guide tube. The speed at which the constant flow liquid supply mechanism 6 supplies liquid to the liquid storage mechanism 5 matches the spinning speed, which is not specifically limited here and is determined according to actual conditions.

[0029] The implementation process of the liftable free liquid surface spinning device for preparing oriented fibers in large quantities of the present invention is as follows: the spinning solution is injected into the constant current liquid supply mechanism 6, and then the spinning solution is injected into the liquid storage mechanism 5 at a constant rate through the constant current liquid supply mechanism 6 until the liquid surface of the spinning solution is level with the surface of the liquid storage mechanism 5, and then the constant current liquid supply mechanism 6 is closed. At this time, the grid 3 is located below the liquid surface of the spinning solution. Then the high-voltage electrostatic generator 7 is turned on, the voltage is set to 50KV, the constant current liquid supply mechanism 6 is turned on again, and the liquid supply speed is 4ml / h, and the lifting component 4 is started to drive the grid 3 to rise and fall in the spinning solution, and the lifting amplitude is 1cm above and below the liquid surface of the spinning solution, so that the grid 3 is repeatedly lifted and lowered in the solution, and the solution carried on the grid 3 is stretched into filaments under the action of high-voltage static electricity, forming a Taylor cone and received by the receiving mechanism 1, and at the same time, the solution on the spinning liquid surface is also stretched into filaments under the action of the electrostatic field force and received by the receiving mechanism 1, and finally a large number of nanofiber membranes with oriented structures are formed.

[0030] In summary, by providing a grid lifting mechanism, it can move up and down along the liquid storage mechanism 5, thereby driving the fluidity of the spinning solution in the liquid storage mechanism 5, thereby achieving the characteristics of reducing the viscosity of the spinning solution and improving the dispersion of the polymer; at the same time, when the grid lifting mechanism extends from the spinning liquid surface, it can break the surface tension of the spinning liquid surface, thereby causing the spinning solution to be stretched under the action of the electrostatic field to produce a large number of fibers;

[0031] By providing a plurality of raised nodes 31 on the grid 3, the raised nodes 31 are beneficial to the generation of tip discharge, and further beneficial to the generation of fibers, so as to achieve the effect of improving the spinning efficiency.

[0032] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A free liquid surface spinning device for preparing oriented fibers in large quantities in a liftable manner, characterized in that: include: A liquid storage mechanism, used for placing a spinning solution; A grid lifting mechanism, at least partially disposed in the liquid storage mechanism and movable up and down along the liquid storage mechanism; A high-voltage electrostatic generator is electrically connected to the grid lifting mechanism and the liquid storage mechanism; The grid lifting mechanism includes a grid arranged in the liquid storage mechanism, and a lifting component arranged on one side of the liquid storage mechanism and used to drive the grid to move up and down. The grid has a plurality of protruding nodes. In the height direction of the free liquid surface spinning device, the diameters of the plurality of protruding nodes increase successively from top to bottom, and the plurality of protruding nodes are needle-shaped. The grid is a rectangular grid, and the plurality of protruding nodes are distributed in parallel on the rectangular grid.

2. The free liquid surface spinning device according to claim 1, characterized in that: The lifting component is a lift.

3. The free liquid surface spinning device according to claim 1, characterized in that: The material of the grid is conductive metal.

4. The free liquid surface spinning device according to claim 1, characterized in that: The free liquid surface spinning device further comprises a receiving mechanism arranged on one side of the liquid storage mechanism.

5. The free surface spinning device according to claim 4, characterized in that: The receiving mechanism includes a roller and a motor for driving the roller to rotate, and the roller is grounded.

6. The free surface spinning device according to claim 1, characterized in that: The free liquid surface spinning device also includes a constant flow liquid supply mechanism for supplying liquid to the liquid storage mechanism, and the constant flow liquid supply mechanism is connected to the liquid storage mechanism through a liquid guide tube.

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