CN212375431U - Preparation device of nanofiber composite material - Google Patents
Preparation device of nanofiber composite material Download PDFInfo
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- CN212375431U CN212375431U CN202020402260.2U CN202020402260U CN212375431U CN 212375431 U CN212375431 U CN 212375431U CN 202020402260 U CN202020402260 U CN 202020402260U CN 212375431 U CN212375431 U CN 212375431U
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Abstract
The utility model relates to a spinning equipment field, to the poor problem of interface bonding fastness between nanofiber and base cloth, provide a nanofiber composite's preparation facilities, including coiling mechanism, heating cylinder, electrostatic spinning machine and hot press, the base cloth removes under coiling mechanism's effect, is equipped with heating structure in the heating cylinder, the low melting point solid polymer is equipped with in the heating cylinder, the heating cylinder surface is equipped with the through-hole that solid polymer can't pass, solid polymer oozes the through-hole after the melting becomes glutinous stream state under the heating structure effect, base cloth is hugged closely with the heating cylinder below, electrostatic spinning machine sprays nanofiber towards base cloth, the hot press carries out the hot pressing to spraying nanofiber's base cloth. This practicality sets up a heating cylinder that can ooze low melting point polymer before electrostatic spinning machine, makes base cloth combine with low melting point polymer earlier, combines with nanofiber again, through the hot pressing, low melting point polymer melt bonds on base cloth to reinforcing nanofiber and base cloth's bonding.
Description
Technical Field
The utility model belongs to the technical field of spinning equipment and specifically relates to a nanofiber composite's preparation facilities is related to.
Background
The electrostatic spinning technology is the most easily available spinning method for the nano-fiber at present, and the nano-fiber felt which is high in porosity and has three-dimensional reticular structure and disordered arrangement can be prepared by the method. Different spinning solutions are adopted to obtain the fiber felt with the fiber diameter of dozens of nanometers to several micrometers, the pore diameter of the fiber felt ranges from dozens of nanometers to several micrometers, and the fiber felt has high surface adsorption energy. The single-layer electrostatic spinning nano fiber felt has poor strength, the requirements on the strength and the deformation resistance of the fiber felt during filtration are difficult to meet, and the obtained fiber felt is uneven, so that the filtration efficiency is seriously influenced. At present, the method for solving the problem of the strength of the electrostatic spinning nano-fiber felt is mainly to form a composite fiber felt by compounding the electrostatic spinning nano-fiber felt with base cloth materials such as woven fabrics, non-woven fabrics and the like, so that the application of the electrostatic spinning nano-fiber felt to a high-efficiency air filter becomes possible.
However, the interface between the electrospun fiber layer and the base cloth has poor bonding fastness and cannot resist various friction forces generated in the use process, thereby limiting the application of the electrospun fiber layer. The uniformity of the electrospun fiber mat can be improved by moving the receiving screen across the roller, but the simultaneous lateral movement of the rotating receiving screen can cause the receiving screen to wobble rather than be smooth. For this purpose, "a continuous electrospinning device" disclosed in chinese patent literature has a publication No. CN104532369A, which includes a spinning section and a receiving section; the spinning part comprises: the liquid storage cylinder is used for storing the spinning liquid; the metering pump is connected with one end of the liquid storage cylinder; the nozzle is connected with the other end of the liquid storage cylinder and is connected with a power supply; the spray head is connected with the spray nozzle through a guide pipe; the nozzle is fixed on the traversing bracket; the receiving section includes: a base cloth unwinding roller for providing a base cloth; the roller receiving screen is arranged at the rear side of the base cloth unwinding roller, is used for winding and receiving the base cloth, corresponds to the spray head, and is used for spraying spinning solution on the base cloth to form an electrostatic spinning fiber layer on the base cloth; the cloth roller is arranged at the rear side of the roller receiving screen and used for winding and receiving the sprayed base cloth; the traversing support transversely moves at one side of the roller receiving screen, and the spinning solution is uniformly sprayed on the base cloth in cooperation with the circular motion of the roller receiving screen. The transverse support and the roller receiving screen are separated into two parts, namely transverse movement and circular motion are separated, so that the transverse uniformity of an electrostatic spinning fiber layer and the rotation stability of the roller are improved.
However, the method can only improve the distribution uniformity of the nano-fibers, and does not greatly help to improve the interface bonding fastness between the electrostatic spinning fiber layer and the base fabric, so that an ideal technical structure is needed to solve the problems.
Disclosure of Invention
The utility model discloses an overcome the poor problem of interface bonding fastness between nanofiber and base cloth, provide a nanofiber composite's preparation facilities, set up a heating cylinder that can ooze low-melting polymer before electrostatic spinning machine, make the base cloth combine with low-melting polymer earlier, combine with nanofiber again, through the hot pressing, low-melting polymer melt bonds on the base cloth to reinforcing nanofiber and base cloth's bonding. The whole preparation device is simple and has strong operability.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a preparation facilities of nanofiber composite, including coiling mechanism, the heating cylinder, electrostatic spinning machine and hot press, the base cloth removes under coiling mechanism's effect, be equipped with the heating structure in the heating cylinder, the solid polymer that the melting point is less than 100 ℃ is equipped with in the heating cylinder, the heating cylinder surface is equipped with the through-hole, the solid polymer can't pass the through-hole, the solid polymer melts to become behind the viscous flow state and oozes the through-hole under the heating structure effect, the base cloth is hugged closely with the heating cylinder below, electrostatic spinning machine includes shower nozzle and receipt screen, the base cloth covers the receipt screen, the shower nozzle is towards receipt screen blowout nanofiber, the hot press carries out the hot pressing to the base cloth of spraying nanofiber, form composite.
The utility model adds a heating roller in the conventional preparation device of the nano-fiber composite material. The surface of the heating roller is provided with a through hole, the solid polymer with the melting point lower than 100 ℃ is placed inside the heating roller, the solid polymer is solid at normal temperature and cannot penetrate through the heating roller, the solid polymer can seep out from the through hole after being heated, the base cloth is tightly attached to the lower part of the heating roller, the base cloth advances under the traction of the winding device, and the polymer can uniformly penetrate into the base cloth. The solid polymer is selected to have a melting point lower than 100 ℃, so that the heat energy for melting the polymer can be saved, and the requirement on a heating structure can be reduced. The solid polymer is solid at normal temperature, is convenient to transport and is safe. The polymer tends to seep out from under the heated cylinder under the action of gravity, so the base cloth is arranged to pass under the heated cylinder. The whole process of the base cloth is as follows: under the traction of a winding device, the molten polymer firstly passes below a heating roller and permeates into the base cloth; and then the nano-fiber and the base cloth are pressed together through the hot pressing of a hot press, and the low-melting-point polymer is fused and bonded on the base cloth, so that the bonding of the nano-fiber and the base cloth is enhanced.
Preferably, the heating roller comprises a cylinder, the cylinder is fixed on a shaft, the shaft is horizontally arranged and perpendicular to the movement direction of the base cloth, the cylinder can rotate around the shaft, the heating structure is also fixed on the shaft and positioned in the cylinder, and the through hole is formed in the side face of the cylinder. The shell of the heating roller is a cylinder, and a shaft fixed by the cylinder is horizontally arranged and is vertical to the movement direction of the base cloth, so that the movement method of the base cloth is parallel to the rotation method of the cylinder. The contact surface is a cylindrical curved surface, the contact area is large, and the smooth contact surface does not obstruct the movement of the contact surface and the contact surface.
Preferably, the inner wall of the cylindrical barrel is provided with a layer of filter cloth. The inner wall of the cylindrical barrel is provided with the filter cloth, so that on one hand, the solid polymer can be separated from the through holes, and the solid polymer with smaller particle size can also be put into use without worrying about the leakage of the solid polymer; on the other hand, the presence of the filter cloth makes it possible to obtain a more uniform exudation rate of the solid polymer after melting.
Preferably, the base cloth is bent in a V-shape at the heating roller and attached under the heating roller. The base cloth covers the heating roller in a V shape, so that the contact area of the base cloth and the heating roller can be greatly increased compared with horizontal contact, and the combination efficiency of the melted polymer and the base cloth is improved.
Preferably, the solid polymer is polycaprolactone. The melting point of polycaprolactone is lower and is between 59 ℃ and 64 ℃, so that the heat energy for melting the polymer can be saved, and the requirement on a heating structure can be reduced.
Preferably, the heating temperature of the heating structure is set to be 1 to 5 ℃ higher than the melting point of the solid polymer. The polymer is melted to a viscous flow state and the temperature needs to reach at least its melting point. However, the temperature is too high, which not only can not save energy, but also can further melt the polymer in a viscous flow state, the viscosity of the polymer is reduced, the seepage speed is too high, the control is not easy, and waste can be caused. Setting the heating temperature of the heating structure to 1-5 c above the melting point of the solid polymer is a reasonable choice.
Preferably, the winding device comprises an unwinding roller, a winding roller and a guide roller, the substrate is wound on the unwinding roller, the moving path is controlled by the guide roller, and finally the substrate is collected by the winding roller.
Preferably, the hot pressing device further comprises a hot pressing roller which is arranged behind the hot pressing machine and used for carrying out secondary hot pressing on the composite material. And the bonding fastness between the nano fibers and the base cloth is further enhanced by secondary hot pressing.
Therefore, the utility model discloses following beneficial effect has: (1) the device is provided with a heating roller capable of seeping out low-melting-point polymer in front of an electrostatic spinning machine, so that base cloth is combined with the low-melting-point polymer firstly and then combined with the nano-fiber, and the low-melting-point polymer is fused and bonded on the base cloth through hot pressing, thereby enhancing the bonding of the nano-fiber and the base cloth; (2) the solid polymer is selected to have a melting point lower than 100 ℃, so that the heat energy for melting the polymer can be saved, and the requirement on a heating structure can be reduced; (3) the base cloth covers the heating roller in a V shape, so that the contact area of the base cloth and the heating roller can be greatly increased compared with horizontal contact, and the combination efficiency of the melted polymer and the base cloth is improved.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a sectional view of the heating drum.
Fig. 3 is a schematic representation of a composite material.
In the figure: 1. the device comprises an unwinding roller, 2, a heating roller, 21, a shaft, 22, a small cylindrical barrel, 23, filter cloth, 24, a cylindrical barrel, 241, a through hole, 3, a guide roller, 4, an electrostatic spinning machine, 41, a metering pump, 42, a liquid storage barrel, 43, spinning liquid, 44, a spray head, 45, a high-voltage power supply, 46, a receiving screen, 5, a hot press, 51, a hot-pressing roller, 6, a hot-pressing roller, 7, a winding roller, 8, base cloth, 9 and nano fibers.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a device for preparing a nanofiber 9 composite comprises a winding device, a heating roller 2, an electrostatic spinning machine 4 and a hot press 5.
The winding device comprises an unwinding roller 1, a winding roller 7 and a plurality of guide rollers 3, wherein the base cloth 8 is wound on the unwinding roller 1, the moving path is controlled by the guide rollers 3, and finally the formed composite material is collected by the winding roller 7.
As shown in FIG. 2, the outermost side of the heating roller 2 is a thin-walled cylinder 24, a plurality of through holes 241 are arranged on the side surface of the cylinder 24, the cylinder 24 is fixed on a shaft 21, the shaft 21 is horizontally arranged and is vertical to the moving direction of the base cloth 8, and the cylinder 24 can rotate around the shaft 21. This makes the movement method of the base cloth 8 parallel to the rotation method of the cylindrical drum 24. A small cylindrical barrel 22 is further fixedly arranged on the shaft 21, the small cylindrical barrel 22 is located in the cylindrical barrel 24, a solid polymer is placed between the small cylindrical barrel 22 and the cylindrical barrel 24, the solid polymer is solid at normal temperature and has a melting point lower than 100 ℃, and the solid polymer is solid at normal temperature, such as polyethylene oxide, polyethylene, polycaprolactone and the like, and has the advantages of saving heat energy for melting the polymer, being convenient to transport, being safe and the like. In this embodiment, polycaprolactone with a melting point of 59-64 deg.C is selected. The solid polymer cannot pass through the through-hole 241. In order to improve the applicability of the cylinder 24, the inner wall of the cylinder 24 is provided with a layer of filter cloth 23. The presence of the filter cloth 23 can not only prevent the leakage of the solid polymer having a small particle diameter but also make the exudation rate of the molten solid polymer more uniform. The small cylinder 22 is provided with a heating structure, which is not shown in the figure because the heating structure is prior art. The temperature of the heating structure is too high, so that energy is not saved, the polymer in a viscous flow state is further melted, the viscosity of the polymer is reduced, the seepage speed is too high, the control is not easy, and waste is caused. Therefore, the utility model discloses preferred set up heating temperature to be 1-5 ℃ higher than the melting point, it is not very high to see heating temperature, so is not very big to the restriction of heating structure. The solid polymer is melted by the heating structure and flows out of the through holes 241 after being changed into a viscous flow state, and the polymer tends to flow out from the lower side of the heating roller 2 by gravity, so that the base fabric 8 is arranged to be closely attached to the lower side of the heating roller 2, and the polymer in the viscous flow state penetrates into the base fabric 8. The contact surface of the base cloth 8 and the heating roller 2 is a cylindrical curved surface, the contact area is large, and the movement of the base cloth and the heating roller is not hindered by the smoothness of the contact surface. In order to further increase the contact area between the base fabric 8 and the heating roller 2 and improve the bonding efficiency between the melted polymer and the base fabric 8, the base fabric 8 is bent in a V-shape at the heating roller 2 and is wrapped under the heating roller 2.
The electrospinning machine 4 includes a metering pump 41, a reservoir 42, a nozzle 44, a high voltage power supply 45, and a receiving screen 46. Only these main components of the electrospinning machine 4 are shown, the other components are omitted and the number of nozzles 44 is not limited to only one shown in the drawings, as is known in the art. The liquid storage cylinder 42 is used for storing spinning liquid 43; the metering pump 41 is connected with the liquid storage cylinder 42, and the volume of the sprayed spinning solution 43 is accurately controlled; the nozzle 44 is connected to the other end of the reservoir 42 and also to a high voltage power supply 45. The base cloth 8 is overlaid on the receiving screen 46. The spinning solution 43 is sprayed by a nozzle 44 under the action of electrostatic voltage to form nanofibers 9, which are deposited on the base fabric 8 on a receiving screen 46 (the receiving screen 46 is grounded and is a spinning negative electrode).
A pair of hot-pressing rollers is arranged in the hot press 5, the base cloth 8 sprayed with the nano-fibers 9 is hot-pressed, and the nano-fibers 9 and the base cloth 8 are pressed together to form the composite material, as shown in fig. 3. The polymer will melt bond to the base cloth 8, enhancing the bonding of the nanofibers 9 to the base cloth 8.
In order to further enhance the bonding fastness between the nano-fibers 9 and the base cloth 8, a pair of hot-pressing rollers 6 is arranged behind the hot-pressing machine 5 for carrying out secondary hot-pressing on the composite material.
The whole process that the base fabric 8 goes through is: under the traction of the winding device, the molten polymer firstly passes below the heating roller 2 and permeates into the base cloth 8; and then the surface of the base cloth 8 is sprayed with a layer of nano-fiber 9 through an electrostatic spinning machine 4, then the nano-fiber 9 and the base cloth 8 are pressed together through hot pressing of a hot press 5, meanwhile, the low-melting-point polymer is fused and bonded on the base cloth 8, bonding of the nano-fiber 9 and the base cloth 8 is enhanced, and finally, the obtained product is collected by a winding roller 7 through secondary hot pressing of a hot pressing roller 6.
The utility model discloses set up a heating cylinder 2 that can ooze low melting point polymer before electrostatic spinning machine 4, make base cloth 8 combine with low melting point polymer earlier, combine with nanofiber 9 again, through the hot pressing, low melting point polymer melt bonds on base cloth 8 to reinforcing nanofiber 9 and base cloth 8's bonding. The whole preparation device is simple and has strong operability.
Claims (8)
1. A preparation device of a nanofiber composite material is characterized by comprising a winding device, a heating roller (2), an electrostatic spinning machine (4) and a hot press (5), wherein a base cloth (8) moves under the action of the winding device, a heating structure is arranged in the heating roller (2), a solid polymer with a melting point lower than 100 ℃ is filled in the heating roller (2), a through hole (241) is formed in the surface of the heating roller (2), the solid polymer cannot penetrate through the through hole (241), the solid polymer is melted under the action of the heating structure and becomes a viscous flow state and then seeps out of the through hole (241), the base cloth (8) is tightly attached to the lower portion of the heating roller (2), the electrostatic spinning machine (4) comprises a spray head (44) and a receiving screen (46), the base cloth (8) covers the receiving screen (46), the spray head (44) sprays nanofiber (9) towards the receiving screen (46), and the hot press (5) carries out hot pressing on the base cloth (8) sprayed with the nanofiber (9, forming a composite material.
2. The apparatus for preparing nanofiber composite as claimed in claim 1, wherein the heating roller (2) comprises a cylindrical drum (24), the cylindrical drum (24) is fixed on a shaft (21), the shaft (21) is horizontally arranged and perpendicular to the moving direction of the base fabric (8), the cylindrical drum (24) can rotate around the shaft (21), the heating structure is also fixed on the shaft (21) and positioned in the cylindrical drum (24), and the through hole (241) is formed on the side surface of the cylindrical drum (24).
3. The apparatus for preparing nanofiber composite as claimed in claim 1 or 2, wherein the inner wall of the cylindrical drum (24) is provided with a layer of filter cloth (23).
4. The apparatus for preparing nanofiber composite as claimed in claim 1, wherein the base fabric (8) is bent in a V-shape at the heating roller (2) and attached under the heating roller (2).
5. The apparatus for preparing nanofiber composite as claimed in claim 1, wherein the solid polymer is polycaprolactone.
6. The apparatus for preparing nanofiber composite as claimed in claim 1 or 5, wherein the heating temperature of the heating structure is set to be 1-5 ℃ higher than the melting point of the solid polymer.
7. The nanofiber composite preparing apparatus according to claim 1, wherein the winding apparatus comprises an unwinding roller (1), a winding roller (7) and a guide roller (3), the substrate is wound on the unwinding roller (1), the moving path is controlled by the guide roller (3), and finally the substrate is collected by the winding roller (7).
8. The device for preparing the nanofiber composite as claimed in claim 1 or 7, further comprising a hot press roller (6) arranged after the hot press (5) for carrying out secondary hot pressing on the composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020402260.2U CN212375431U (en) | 2020-03-25 | 2020-03-25 | Preparation device of nanofiber composite material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020402260.2U CN212375431U (en) | 2020-03-25 | 2020-03-25 | Preparation device of nanofiber composite material |
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| CN212375431U true CN212375431U (en) | 2021-01-19 |
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| CN202020402260.2U Active CN212375431U (en) | 2020-03-25 | 2020-03-25 | Preparation device of nanofiber composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116334776A (en) * | 2023-03-07 | 2023-06-27 | 东华大学 | Secondary drafting and bundling collecting device for micro-nano fibers |
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2020
- 2020-03-25 CN CN202020402260.2U patent/CN212375431U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116334776A (en) * | 2023-03-07 | 2023-06-27 | 东华大学 | Secondary drafting and bundling collecting device for micro-nano fibers |
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Address after: 311200 29 Chenghu Road, Yaqian Town, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Hengyi Petrochemical Research Institute Co.,Ltd. Address before: 311200 Room 501, 3 Blocks, Pearl Plaza, South Bank of Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG HENGLAN TECHNOLOGY Co.,Ltd. |