CN110923957B - Collection mechanism and electrospinning device for electrospinning double pleated nanofiber membranes - Google Patents
Collection mechanism and electrospinning device for electrospinning double pleated nanofiber membranes Download PDFInfo
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- CN110923957B CN110923957B CN201911198305.7A CN201911198305A CN110923957B CN 110923957 B CN110923957 B CN 110923957B CN 201911198305 A CN201911198305 A CN 201911198305A CN 110923957 B CN110923957 B CN 110923957B
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- 239000012528 membrane Substances 0.000 title claims abstract description 177
- 239000002121 nanofiber Substances 0.000 title claims abstract description 63
- 230000007246 mechanism Effects 0.000 title claims abstract description 61
- 238000001523 electrospinning Methods 0.000 title claims abstract description 39
- 239000011810 insulating material Substances 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims description 53
- 229910052751 metal Inorganic materials 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 28
- 238000009987 spinning Methods 0.000 claims description 22
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- 230000000149 penetrating effect Effects 0.000 claims description 9
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
- D04H3/03—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments at random
- D04H3/033—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments at random reorientation immediately after yarn or filament formation
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
- D04H3/05—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in another pattern, e.g. zig-zag, sinusoidal
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Nonwoven Fabrics (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
本发明公开了一种用于电纺双褶皱纳米纤维膜的收集机构及电纺装置，所述收集机构包括自下而上依次层叠设置的导电层、第一弹性膜和第二弹性膜，所述第一弹性膜和第二弹性膜均为绝缘材料，所述第一弹性膜和第二弹性膜均处于拉伸状态且固定安装在导电层上，所述第一弹性膜和第二弹性膜沿同方向拉伸，所述第一弹性膜的拉伸量大于第二弹性膜，所述第一弹性膜上沿其拉伸方向均匀排列多个条形凹槽，所述条形凹槽长度方向垂直于第一弹性膜拉伸方向设置，所述第二弹性膜上均匀密布通孔。应用该收集机构可制得具有特殊的双褶皱结构的电纺纳米纤维膜，能够更大限度的提高电纺纳米纤维膜的拉伸性能和比表面积。
The invention discloses a collection mechanism and an electrospinning device for electrospinning a double-folded nanofiber membrane. The collection mechanism comprises a conductive layer, a first elastic film and a second elastic film which are sequentially stacked from bottom to top. The first elastic film and the second elastic film are both insulating materials, the first elastic film and the second elastic film are both in a stretched state and are fixedly installed on the conductive layer, the first elastic film and the second elastic film When stretched in the same direction, the stretching amount of the first elastic film is greater than that of the second elastic film, and a plurality of strip-shaped grooves are evenly arranged on the first elastic film along its stretching direction, and the length of the strip-shaped grooves is The direction is perpendicular to the stretching direction of the first elastic film, and the through holes are evenly and densely distributed on the second elastic film. Using the collection mechanism, an electrospun nanofiber membrane with a special double-folded structure can be prepared, and the tensile properties and specific surface area of the electrospun nanofiber membrane can be improved to a greater extent.
Description
Technical Field
The invention relates to the technical field of electrostatic spinning, in particular to a collecting mechanism for an electrospun double-folded nanofiber membrane and an electrospinning device.
Background
The electrostatic spinning technology is a universal nano fiber preparation method, and the preparation device is simple, has unique operability, low cost and wide application range. The prepared nano-fiber has the characteristics of high porosity, large specific surface area, large length-diameter ratio and uniform fiber diameter, and has good application prospect in a plurality of fields such as biomedical materials, filter materials, photoelectric devices, catalyst carrier materials and the like.
The electrospinning device for preparing the nanofiber membrane by utilizing the electrospinning technology generally comprises a liquid supply mechanism, a spinning emission mechanism (comprising a high-voltage power supply and a spinning nozzle connected with the high-voltage power supply) and a collecting mechanism for collecting electrospun fibers, wherein the collecting mechanism has a large influence on the appearance structure of the electrospun fiber membrane, the conventional electrospinning device generally adopts an aluminum foil or a metal plate, and the electrospun nanofiber with a non-woven fabric structure can be prepared by adopting the conventional collecting mechanism.
In order to improve the tensile property of the electrospun nanofiber membrane, chinese patent publication No. CN105970350B discloses a preparation method of a stretchable polymer composite, which adopts an electrostatic spinning technology, collects electrospun fibers with a pre-stretched rubber substrate as a collector, and forms a single wrinkle structure on the electrospun nanofiber membrane according to a specific periodicity by the recovery of the rubber substrate after completing electrospinning to improve the tensile property thereof. The nanometer fiber membrane with a single fold structure can be prepared by adopting a prestretched elastic substrate similar to a rubber substrate as a collecting mechanism, but the improvement effect of the collecting mechanism on the tensile property of the fiber membrane is limited by the maximum prestretching amount of the elastic substrate material, so the improvement on the tensile property of the fiber membrane is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a collecting mechanism and an electrospinning device for electrospinning a double-fold nanofiber membrane, the effect of the collecting mechanism on improving the tensile property of the electrospinning nanofiber membrane is not limited by the maximum pre-stretching amount of a single-layer elastic base material, and the prepared electrospinning nanofiber membrane has a special double-fold structure and can improve the tensile property and the specific surface area of the electrospinning nanofiber membrane to a greater extent.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a collection mechanism for two fold nanofiber membranes of electricity spinning, includes conducting layer, first elastic membrane and the second elastic membrane that stacks gradually the setting from bottom to top, first elastic membrane and second elastic membrane are insulating material, first elastic membrane and second elastic membrane all are in tensile state and fixed mounting on the conducting layer, first elastic membrane and second elastic membrane are tensile along the equidirectional, the tensile volume of first elastic membrane is greater than the second elastic membrane, follow its tensile direction align to grid a plurality of bar recesses on the first elastic membrane, bar recess length direction perpendicular to first elastic membrane tensile direction sets up, evenly densely covered through-hole on the second elastic membrane.
Preferably, the through hole in the second elastic membrane is a circular through hole, and the groove width of the strip-shaped groove is smaller than the diameter of the circular through hole when the first elastic membrane and the second elastic membrane are in an unstretched state.
Preferably, the conductive layer is a metal plate, one end of the first elastic membrane in the stretching direction is fixed on the metal plate through a first connecting component, and the other end of the first elastic membrane is detachably connected with the metal plate through a second connecting component; one end of the second elastic membrane along the stretching direction is also fixed on the metal plate through the first connecting part, and the other end of the second elastic membrane is detachably connected with the metal plate through the third connecting part.
Preferably, the first connecting component is a first pressing strip abutted against the upper surface of the second elastic film, the first pressing strip is perpendicular to the stretching direction of the second elastic film, first through holes capable of penetrating first fixing bolts are formed in two ends of the first pressing strip, a first screw hole assembly is arranged on the metal plate corresponding to the first through holes and comprises two first screw holes matched with the first fixing bolts, the two first screw holes are respectively formed under the two first through holes, and the two ends of the first pressing strip are respectively connected with the first screw holes through the first fixing bolts penetrating the first through holes.
Preferably, the second connecting part is a second pressing strip abutted against the upper surface of the first elastic film, the second pressing strip is perpendicular to the stretching direction of the first elastic film, second through holes capable of penetrating second fixing bolts are formed in two ends of the second pressing strip, a second screw hole assembly is arranged on the metal plate corresponding to the second through holes and comprises two second screw holes matched with the second fixing bolts, the two second screw holes are respectively arranged under the two second through holes, the two ends of the second pressing strip are respectively connected with the second screw holes through the second fixing bolts, and the second screw hole assembly is arranged in a plurality and is evenly distributed along the stretching direction of the first elastic film.
Preferably, the third connecting part is a third pressing strip abutted against the upper surface of the second elastic film, the third pressing strip is arranged perpendicular to the stretching direction of the second elastic film, third through holes capable of being communicated with the second screw holes are formed in two end parts of the third pressing strip, the third through holes can be provided with the second fixing bolts in a penetrating mode, and two end parts of the third pressing strip are respectively connected with the second screw holes through the second fixing bolts arranged in the third through holes in a penetrating mode.
As preferred, the upper surface of conducting layer establish into the rectangle first elastic film with the second elastic film all establishes into the rectangle membrane, first elastic film with the long limit parallel arrangement of second elastic film, first elastic film with the second elastic film is all followed the long limit direction of first elastic film is tensile, first elastic film with under the first layering is all located to the minor face of second elastic film stiff end, and another minor face of first elastic film is located under the second layering, another minor face of second elastic film is located under the third layering.
Preferably, the first, second and third beads are made of an insulating material.
Preferably, the lower surfaces of the first pressing strip, the second pressing strip and the third pressing strip are provided with anti-skidding structures.
The invention also discloses an electrospinning device, which comprises a collecting mechanism, an emitting mechanism arranged above the collecting mechanism, and a liquid supply mechanism for supplying spinning liquid to the spinning emitting electrode, and is characterized in that the collecting mechanism is any one of the collecting mechanisms for electrospinning double-fold nanofiber membranes.
Compared with the prior art, the invention has the advantages and positive effects that: the collection mechanism and the electrospinning device for the electrospun double-folded nanofiber membrane are provided, the improvement effect of the collection mechanism on the tensile property of the electrospun nanofiber membrane is not limited by the maximum pre-stretching amount of a single-layer elastic base material, and the prepared electrospun nanofiber membrane has a special double-folded structure and can improve the tensile property and the specific surface area of the electrospun nanofiber membrane to a greater extent.
Drawings
FIG. 1 is a top view of the collection mechanism for electrospun double-pleated nanofiber membrane of example 1;
FIG. 2 is a front view of the collection mechanism for electrospun double-pleated nanofiber membrane of example 1;
FIG. 3 is an optical photograph of the electrospun double-pleated nanofiber membrane prepared in example 2;
FIG. 4 is an SEM photograph of an electrospun double-pleated nanofiber membrane prepared in example 2;
in the above figures: the manufacturing method comprises the following steps of 1-a metal plate, 2-a first elastic membrane, 21-a strip-shaped groove, 3-a second elastic membrane, 31-a through hole, 4-a first pressing strip, 5-a third pressing strip, 6-a second pressing strip, 7-a first fixing bolt, 8-a second fixing bolt, 9-a second screw hole component and 91-a second screw hole.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Example 1
As shown in fig. 1 and 2, the collecting mechanism for electrospun double-folded nanofiber membrane comprises a conductive layer, a first elastic membrane 2 and a second elastic membrane 3 which are sequentially stacked from bottom to top, wherein the first elastic membrane 2 and the second elastic membrane 3 are both made of insulating materials, the first elastic membrane 2 and the second elastic membrane 3 are both in a stretched state and are fixedly mounted on the conductive layer, the first elastic membrane 2 and the second elastic membrane 3 are stretched along the same direction, the stretching amount of the first elastic membrane 2 is greater than that of the second elastic membrane 3, a plurality of strip-shaped grooves 21 are uniformly arranged on the first elastic membrane 2 along the stretching direction, the length direction of the strip-shaped grooves 21 is perpendicular to the stretching direction of the first elastic membrane 2, and through holes 31 are uniformly and densely distributed on the second elastic membrane 3.
The electrospinning device comprises a collecting mechanism for depositing and collecting electrospun nanofibers and an emitting mechanism arranged above the collecting mechanism, wherein the emitting mechanism emits the electrospun nanofibers by using electric field force, a liquid supply mechanism for supplying spinning liquid to a spinning emitter is provided, and the collecting mechanism is the collecting mechanism for electrospinning a double-fold nanofiber membrane.
By adopting the electrospinning device with the collecting mechanism, the spinning solution is stretched under the action of the electric field force, the fibers are deposited on the upper surface of the pre-stretched second elastic membrane 3 to be in contact with the second elastic membrane 3, meanwhile, the spinning solution is in contact with the pre-stretched first elastic membrane 2 below the second elastic membrane 3 through the through holes 31, and a double-fold structure is formed on the surface of the electrospun nanofiber through the combined action of the first elastic membrane 2 and the second elastic membrane 3 with different stretching amounts and different patterns, and densely-distributed fine folds (as shown in figure 3) are formed between large folds of the double-fold structure in a periodic arrangement, compared with the electrospun fiber membrane with a single-fold structure which is prepared by taking a single-layer pre-stretched elastic base material as the collecting mechanism, the formation of the fine folds between the large folds can effectively increase the stretching performance of the electrospun fiber membrane, so that the improvement of the stretching performance of the electrospun nanofiber membrane exceeds the maximum pre-stretching amount limit of the single-layer elastic base material, the tensile property and the specific surface area of the electrospun nanofiber membrane can be improved to a greater extent.
Specifically, the liquid supply mechanism can comprise a syringe needle tube which is arranged on an injection pump; the emission mechanism can include the metal syringe needle of locating on the syringe needle tubing, the metal syringe needle is connected high voltage power supply positive pole, the conducting layer is connected high voltage power supply negative pole. Besides, the liquid supply mechanism and the emission mechanism of the electrospinning device can also adopt other conventional arrangements.
Specifically, the through hole 31 in the second elastic membrane 3 is a circular through hole, and the width of the strip-shaped groove 21 is smaller than the diameter of the circular through hole when the first elastic membrane 2 and the second elastic membrane 3 are in an unstretched state. The larger aperture of the through hole 31 enables the electrospun nanofibers deposited on the second elastic membrane 3 to be more fully contacted with the strip-shaped grooves 21 of the lower pre-stretched first elastic membrane 2, so as to ensure the formation of the double-fold structure of the electrospun nanofibers.
Specifically, the conductive layer is a metal plate 1, the first elastic membrane 2 and the second elastic membrane 3 are both elastic rubber membranes, one end of the first elastic membrane 2 in the stretching direction is fixed on the metal plate 1 through a first connecting component, and the other end of the first elastic membrane is detachably connected with the metal plate 1 through a second connecting component; one end of the second elastic membrane 3 in the stretching direction thereof is also fixed to the metal plate 1 by a first connecting member, and the other end is detachably connected to the metal plate 1 by a third connecting member.
Specifically, first connecting part is the first layering 4 of butt at 3 upper surfaces of second elastic membrane, first layering 4 perpendicular to the 3 tensile direction settings of second elastic membrane, first layering 4 both ends all are equipped with the first through-hole that can wear to establish first fixing bolt 7, correspond on the metal sheet 1 first through-hole sets up first screw subassembly, first screw subassembly includes two and the first screw of 7 looks adaptations of first fixing bolt, and two first screw divide and locate under two first through-holes, first layering both ends are respectively through wearing to locate first fixing bolt 7 in the first through-hole is connected first screw.
Specifically, the second connecting part is a second pressing strip 6 which is abutted against the upper surface of the first elastic film 2, the second pressing strip 6 is perpendicular to the stretching direction of the first elastic film 2, the two ends of the second pressing strip 6 are respectively provided with a second through hole through which a second fixing bolt 8 can penetrate, a second screw hole assembly 9 is arranged on the metal plate 1 corresponding to the second through hole, the second screw hole assembly 9 comprises two second screw holes 91 matched with the second fixing bolts 8, the two second screw holes 91 are respectively arranged under the two second through holes, the two ends of the second pressing strip 6 are respectively connected with the second screw holes 91 through the second fixing bolts 8, and the second screw hole assembly 9 is arranged in a plurality of ways and is uniformly arranged along the stretching direction of the first elastic film 2. By adopting the structure, the second pressing strip 6 and the second screw hole assemblies 9 at different positions can be connected to flexibly adjust the stretching amount of the first elastic membrane 2, so that the double-fold nanofiber membrane with large folds and small folds arranged according to different proportions can be obtained, and the electrospinning device can more flexibly adjust the stretching performance of the electrospinning fiber.
Specifically, the third connecting part is a third pressing strip 5 abutted against the upper surface of the second elastic film 3, the third pressing strip 5 is perpendicular to the stretching direction of the second elastic film 3, third through holes capable of being communicated with the second screw holes 91 are formed in two end portions of the third pressing strip 5, the second fixing bolts 8 can be arranged in the third through holes in a penetrating mode, and two end portions of the third pressing strip 5 are respectively connected with the second screw holes 91 through the second fixing bolts 8 arranged in the third through holes in a penetrating mode. By adopting the structure, the third pressing strip 5 can be connected with the second screw hole assemblies 9 at different positions to flexibly adjust the stretching amount of the second elastic membrane 3, and the arrangement proportion of large wrinkles and small wrinkles of the electrospun fiber membrane can be more flexibly adjusted by combining the flexible adjustment of the stretching amount of the first elastic membrane 2, so that the electrospinning device can more flexibly adjust the stretching performance of electrospun fibers.
Specifically, as shown in fig. 1, the upper surface of conducting layer establish into rectangle first elastic membrane 2 with second elastic membrane 3 all establishes into rectangular membrane, first elastic membrane 2 with the long limit parallel arrangement of second elastic membrane 3, first elastic membrane 2 with second elastic membrane 3 all follows first elastic membrane 2 long limit direction is tensile, first elastic membrane 2 with under first layering 4 is all located to the minor face of second elastic membrane 3 stiff end, and another minor face of first elastic membrane 2 is located under second layering 6, and another minor face of second elastic membrane 3 is located under third layering 5.
Specifically, the first pressing strip 4, the second pressing strip 6 and the third pressing strip 5 are all made of insulating materials. The insulating material pressing strip can avoid the influence of the pressing strip on the electric field of the electrospinning device, so that the electrospinning process is more stable and controllable.
Specifically, the lower surfaces of the first pressing strip 4, the second pressing strip 6 and the third pressing strip 5 are all provided with anti-skidding structures. The arrangement of the anti-slip structure can increase the contact force between the pressing strip and the first elastic film 2 and the second elastic film 3, and the pressing strip can more firmly clamp and fix the first elastic film 2 and the second elastic film 3.
Example 2
A method of preparing an electrospun double-pleated nanofiber membrane using the electrospinning apparatus of example 1, comprising the steps of:
(1) preparing a spinning solution: weighing 0.6g of TPU in a weighing bottle, adding 4.4ml of DMF solution, and stirring for 1h at 40 ℃ to obtain a spinning solution;
(2) electro-spun fibrous membrane: placing the collecting mechanism in the embodiment 1 below a spinning nozzle of an emitting mechanism, adjusting the fixing positions of a second pressing strip 6 and a third pressing strip 5 on a metal plate 1 to pre-stretch a first elastic film 2 along the length direction thereof, wherein the pre-stretching rate is 100%, a second elastic film 3 and the first elastic film 2 are stretched in the same direction, the pre-stretching rate is 30%, injecting the spinning solution prepared in the step (1) into a liquid supply mechanism of an electrospinning device, adjusting the spinning parameters to be the spinning distance of 12cm, the liquid supply speed of the spinning solution to be 0.75m l/h, the voltage to be 12.5kv and the spinning time to be 180 min, and starting the electrospinning device to electrospinning nanofibers to deposit on the upper surface of the second elastic film 3 to form an electrospun fiber film;
(3) taking a film: closing the electrospinning device, taking down the second pressing strip 6 and the third pressing strip 5 from the metal plate 1, so that the second elastic membrane 3 and the first elastic membrane 2 recover to original lengths, the electrospun nanofibers obtained in the step (2) shrink to form a double-fold structure, and taking down the electrospun nanofiber membrane from the second elastic membrane 3, so as to obtain the electrospun double-fold nanofiber membrane, wherein the morphology structure of the electrospun double-fold nanofiber membrane is shown in fig. 3, and as can be seen from fig. 3, densely distributed fine folds are formed between periodically arranged large folds on the surface of the electrospun double-fold nanofiber membrane prepared by the electrospinning device of the embodiment 1. The microstructure of the electrospun double-folded nanofiber membrane is shown in fig. 4, the protrusions in fig. 4 are fine folds of the fiber membrane, and the macro-fold structure is not shown in the SEM image due to the large size of the macro-folds.
The electrospun double-folded nanofiber membrane obtained in example 2 was tested for tensile properties at a maximum tensile rate of 1200% (tensile in the direction of the first elastic membrane 2 during preparation).
The calculation method of the maximum stretching ratio comprises the following steps:
maximum draw ratio (maximum drawn length of film/original length of film) × 100%
Comparative example 1
An elastic rubber membrane with the pre-stretching ratio of 100% is used as a collecting mechanism of an electrospinning device, and an electrospun wrinkle nanofiber membrane is prepared by using the same spinning solution formula and spinning parameters as those in the embodiment 2 and is used as a first control nanofiber membrane.
The first control nanofiber membrane obtained in comparative example 1 was measured to have a maximum tensile rate of 650% by tensile property test.
Comparative example 2
The metal plate 1 was used as a collection mechanism of an electrospinning device to prepare an electrospun nanofiber membrane as a second control nanofiber membrane using the same spinning solution formulation and spinning parameters as in example 2.
The maximum tensile rate of the second control nanofiber membrane obtained in comparative example 2 was measured to be 350% by tensile property test.
It can be seen from the comparison of the maximum stretching ratios of the electrospun nanofiber membranes obtained in the embodiment 2, the comparative examples 1 and 2 that the double-fold structure formed by electrospinning the collection mechanism in the embodiment 1 can effectively increase the stretching performance of the electrospun fiber membrane, so that the improvement of the stretching performance of the electrospun nanofiber membrane exceeds the maximum pre-stretching amount limit of the single-layer elastic base material, and the stretching performance and the specific surface area of the electrospun nanofiber membrane can be improved to a greater extent.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (9)
1. The collecting mechanism for the electrospun double-folded nanofiber membrane is characterized by comprising a conductive layer, a first elastic membrane and a second elastic membrane which are sequentially stacked from bottom to top, wherein the first elastic membrane and the second elastic membrane are made of insulating materials, the first elastic membrane and the second elastic membrane are both in a stretching state and are fixedly mounted on the conductive layer, the first elastic membrane and the second elastic membrane are stretched in the same direction, the stretching amount of the first elastic membrane is larger than that of the second elastic membrane, a plurality of strip-shaped grooves are uniformly arranged on the first elastic membrane along the stretching direction of the first elastic membrane, the length direction of the strip-shaped grooves is perpendicular to the stretching direction of the first elastic membrane, and through holes are uniformly densely distributed on the second elastic membrane; the through hole on the second elastic membrane is a circular through hole, the first elastic membrane and the second elastic membrane are in an unstretched state, and the groove width of the strip-shaped groove is smaller than the diameter of the circular through hole.
2. The collection mechanism for electrospun double-pleated nanofiber membrane according to claim 1, wherein the conductive layer is provided as a metal plate, one end of the first elastic membrane in the stretching direction thereof is fixed on the metal plate through a first connecting part, and the other end is detachably connected with the metal plate through a second connecting part; one end of the second elastic membrane along the stretching direction is also fixed on the metal plate through the first connecting part, and the other end of the second elastic membrane is detachably connected with the metal plate through the third connecting part.
3. The collecting mechanism for electrospun double-folded nanofiber membrane according to claim 2, wherein the first connecting component is a first pressing strip abutted against the upper surface of the second elastic membrane, the first pressing strip is arranged perpendicular to the stretching direction of the second elastic membrane, first through holes capable of being penetrated by first fixing bolts are arranged at two ends of the first pressing strip, a first screw hole component is arranged on the metal plate corresponding to the first through holes, the first screw hole component comprises two first screw holes matched with the first fixing bolts, the two first screw holes are respectively arranged under the two first through holes, and two ends of the first pressing strip are respectively connected with the first screw holes through the first fixing bolts penetrating through the first through holes.
4. The collecting mechanism for electrospun double-folded nanofiber membrane according to claim 3, wherein the second connecting part is a second pressing strip abutted against the upper surface of the first elastic membrane, the second pressing strip is arranged perpendicular to the stretching direction of the first elastic membrane, second through holes capable of being penetrated by second fixing bolts are arranged at two end parts of the second pressing strip, a second screw hole assembly is arranged on the metal plate corresponding to the second through holes and comprises two second screw holes matched with the second fixing bolts, the two second screw holes are respectively arranged under the two second through holes, two end parts of the second pressing strip are respectively connected with the second screw holes through the second fixing bolts, and the second screw hole assemblies are arranged in a plurality and are uniformly distributed along the stretching direction of the first elastic membrane.
5. The collecting mechanism for electrospun double-folded nanofiber membrane according to claim 4, wherein the third connecting part is a third bead abutted against the upper surface of the second elastic membrane, the third bead is arranged perpendicular to the stretching direction of the second elastic membrane, both ends of the third bead are provided with third through holes capable of being communicated with the second screw holes, the third through holes are capable of being penetrated by the second fixing bolts, and both ends of the third bead are respectively connected with the second screw holes through the second fixing bolts penetrating through the third through holes.
6. The collecting mechanism for electrospun double-folded nanofiber membrane according to claim 5, wherein the upper surface of the conductive layer is rectangular, the first elastic membrane and the second elastic membrane are rectangular membranes, the long sides of the first elastic membrane and the second elastic membrane are arranged in parallel, the first elastic membrane and the second elastic membrane are stretched along the direction of the long side of the first elastic membrane, the short sides of the fixed ends of the first elastic membrane and the second elastic membrane are both arranged under the first pressing bar, the other short side of the first elastic membrane is arranged under the second pressing bar, and the other short side of the second elastic membrane is arranged under the third pressing bar.
7. The collection mechanism for electrospun double-pleated nanofiber membrane according to claim 5 wherein the first bead, second bead and third bead are made of an insulating material.
8. The collection mechanism for electrospun double-folded nanofiber membrane according to claim 5, wherein the lower surfaces of the first bead, the second bead and the third bead are provided with anti-slip structures.
9. An electrospinning device comprising a collecting mechanism, a launching mechanism disposed above the collecting mechanism, and a liquid supply mechanism for supplying a spinning solution to the launching mechanism, wherein the collecting mechanism is the collecting mechanism for electrospinning a double-pleated nanofiber membrane as claimed in any one of claims 1 to 8.
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