CN112981718A - Electrostatic spinning fiber flocculus and preparation method thereof - Google Patents

Electrostatic spinning fiber flocculus and preparation method thereof Download PDF

Info

Publication number
CN112981718A
CN112981718A CN202110159088.1A CN202110159088A CN112981718A CN 112981718 A CN112981718 A CN 112981718A CN 202110159088 A CN202110159088 A CN 202110159088A CN 112981718 A CN112981718 A CN 112981718A
Authority
CN
China
Prior art keywords
spinning
hot air
fibers
electrostatic spinning
module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110159088.1A
Other languages
Chinese (zh)
Inventor
丁彬
高卢明
王赛
吴红炎
张世超
印霞
俞建勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Donghua University
Original Assignee
Donghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Donghua University filed Critical Donghua University
Priority to CN202110159088.1A priority Critical patent/CN112981718A/en
Publication of CN112981718A publication Critical patent/CN112981718A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/545—Polyvinyl alcohol
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/55—Polyesters
    • 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/542—Adhesive fibres
    • D04H1/551—Resins thereof not provided for in groups D04H1/544 - D04H1/55
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention discloses an electrostatic spinning fiber flocculus and a preparation method thereof. The preparation method comprises the following steps: spinning the spinning solution A and the spinning solution B with different concentrations through a cross type bidirectional electrostatic spinning device to respectively spin micro-fibers and nano-fibers, wherein the micro-fibers and the nano-fibers are stacked on a positive pressure hot air receiving device in a curling shape and subjected to in-situ crosslinking reaction under the action of hot air to finally obtain an electrostatic spinning fiber flocculus; the cross-type bidirectional electrostatic spinning device comprises a spinning module I and a spinning module II which are respectively connected with a positive voltage power supply and a negative voltage power supply, and polymer charged jet streams sprayed by the spinning module I and the spinning module II are received on a positive-pressure hot air receiving device to form electrostatic spinning fiber flocculus. The invention provides a method for preparing an electrostatic spinning fiber flocculus with good tensile property and high compression resilience in one step.

Description

Electrostatic spinning fiber flocculus and preparation method thereof
Technical Field
The invention relates to a lightweight high-strength electrospun fiber flocculus and a preparation method thereof, belonging to the technical field of electrospun fibers.
Background
The electrostatic spinning technology has the characteristics of low cost, strong controllability and wide raw material source, and the prepared fiber material has the characteristics of small diameter, small aperture, high porosity and the like, and has wide application prospects in the fields of sound absorption, heat preservation, air filtration, tissue engineering and the like. However, the fluffy flocculus prepared by the electrostatic spinning technology is usually formed by disordered stacking of fibers, and the fluffy structure is easy to collapse after the flocculus is compressed and has poor tensile property. In addition, the preparation of the prior electrostatic spinning wadding material needs to be carried out in a high-humidity environment (RH is more than or equal to 80 percent), and the dependence on the humidity of the environment is higher. These problems have prevented electrospun fiber batts from meeting the practical needs of their use in various industries, limiting their use in many applications.
Patent zl201710818067.x discloses a preparation method and device of fluffy elastic three-dimensional micro-nano fiber material, fiber material prepared by the method and application thereof, wherein an electrostatic spinning technology is combined with a traditional flocculus preparation technology, thicker micro-fiber and nano-fiber generated by electrostatic spinning are uniformly mixed under a gaseous condition, and the fluffy elastic three-dimensional micro-nano fiber material with high porosity, low density and high specific surface area is obtained after heat treatment. Patent CN201710358539.8 discloses an electrostatic spinning device and method for preparing fluffy nanofibers, wherein an air supply device is introduced at the side of a spraying device, sheath gas is introduced during the spinning process to obtain fluffy nanofibers, so that nanofiber materials with certain fluffy property can be prepared, but the airflow at a nozzle easily has a large influence on the stability of spinning jet flow, and meanwhile, the obtained nanofibers are in a common cylindrical shape, are simply fluffy and stacked, and are unstable in fluffy structure, so that long-term use cannot be ensured. The documents Nanoscale,2019,11,8185 provide a preparation method of an ultra-light and stable-structure three-dimensional fiber aggregate, uniform water mist is applied to an electrostatic spinning fiber receiving area, and organic solvent steam is utilized to perform cross-linking treatment on flocculus, so that the surface layer of the fiber is dissolved by the organic solvent steam, the intersection points of adjacent fibers are fused, meanwhile, the whole structure is not damaged, but the steam cross-linking time is long, the process is complex, the organic solvent recovery treatment difficulty is high, the harm to human bodies and the environment is large, and the mass production is not facilitated.
Therefore, a method for simply and rapidly preparing the lightweight high-strength electrospun fiber flocculus is needed to meet the application requirements of the electrospun fiber flocculus in various fields.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a preparation method of a lightweight high-strength electrospun fiber flocculus.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of electrostatic spinning fiber flocculus is characterized in that spinning solution A and spinning solution B with different concentrations are subjected to electrostatic spinning through a cross-type bidirectional electrostatic spinning device to respectively spin micrometer fibers and nanometer fibers, the micrometer fibers and the nanometer fibers are accumulated on a positive-pressure hot air receiving device in a curling shape, and in-situ crosslinking reaction is carried out under the action of hot air to finally obtain the electrostatic spinning fiber flocculus; the cross-type bidirectional electrostatic spinning device comprises a first spinning module and a second spinning module which are respectively connected with a positive voltage power supply and a negative voltage power supply, polymer charged jet streams sprayed by the first spinning module and the second spinning module are received on a positive-pressure hot air receiving device to form electrostatic spinning fiber flocculus, the first spinning module and the second spinning module are not arranged in parallel, and the spinning directions of the first spinning module and the second spinning module are inclined to opposite directions; the surface of the positive-pressure hot air receiving device is provided with a hollowed receiving substrate with hollowed round holes uniformly distributed, the bottom of the positive-pressure hot air receiving device is provided with a metal wire heating device, a speed-adjustable fan is arranged below the metal wire heating device, and hot air flow generated by the speed-adjustable fan and the metal wire heating device is blown to the electrostatic spinning fiber flocculus received on the surface of the positive-pressure hot air receiving device from the hollowed round holes through an air flow pipeline.
Preferably, the mass concentration of the spinning solution A is 25-60%, and the mass concentration of the spinning solution B is 5-25%.
Preferably, the spinning solution A and the spinning solution B have the same components and are prepared by dissolving and stirring a polymer in a solvent and adding a cross-linking agent; the polymer is at least one of polyacrylonitrile, polyamide, polyvinyl alcohol, polylactic acid, polyethylene oxide, polyvinyl chloride, polyvinylidene fluoride, polystyrene, polybenzimidazole, polycarbonate, polymethyl methacrylate, polytrimethylene terephthalate, polyethylene terephthalate, polycaprolactone, polyhydroxybutyrate, polysulfone, polyethyleneimine, polyvinyl butyral, polyethylene, polyimide and aramid 1313; the solvent is at least one of N, N-dimethylformamide, N-dimethylacetamide, methanol, ethanol, formic acid, acetic acid, dimethyl sulfoxide, toluene, acetone, cyclohexane, isobutanol, dichloromethane, butyl acetate, ethyl acetate and chloroform; the crosslinking agent is at least one of trifunctional aziridine crosslinking agent, diphenylmethane diisocyanate, p-toluenesulfonic acid, hexamethylene diisocyanate, dicumyl peroxide and triallyl isocyanurate, and the addition amount of the crosslinking agent is 0.5-30% of the mass of the polymer.
Preferably, the diameter of the micro-fiber is 2-7 μm, and the diameter of the nano-fiber is 100-700 nm.
Preferably, the electrostatic spinning process parameters are as follows: the voltage is 30-90 kV, the receiving distance is 10-50 cm, the filling speed is 0.1-10 mL/h, the spinning temperature is 20-40 ℃, and the environmental humidity is 45-80%.
Preferably, the first spinning module and the second spinning module are formed by arranging needle type spray heads in parallel, wherein the number of the needle type spray heads is 1-8, and the diameter of each spinning hole is 0.1-2 mm.
Preferably, the hollowing outThe diameter of the round holes 8 is 1-5 mm, and the number of the round holes is 9-121; the hollow receiving substrate is made of any one of conductive rubber, metal stainless steel and carbon fiber; the air outlet of the airflow pipeline is the same with the hollow receiving substrate in size and shape, and the area is specifically 0.08-1 m2。
Preferably, the flow speed of the hot air flow blown out of the positive pressure hot air receiving device is 0.1-1 m/s, and the temperature is 50-70 ℃.
The invention also provides the electrostatic spinning fiber flocculus prepared by the preparation method of the electrostatic spinning fiber flocculus.
Preferably, the minimum pore diameter in the electrostatic spinning fiber flocculus is 0.1-5 μm, the porosity is not less than 99%, the thickness is 15-50 mm, and the volume density is 2-10 mg/cm3Tensile strength of not less than 1MPa, compression rebound rate of not less than 95 percent and thermal resistance value of not less than 0.5-2 m2K/W。
The positive-pressure hot air flow in the invention is blown out through the hollow round holes on the receiving substrate, and has multiple functions: (1) under the action of the positive-pressure hot air flow, residual solvents in the micro fibers and the nano fibers accumulated on the receiving substrate are blown out with hot air and are volatilized rapidly, so that the damage of the residual solvents to the appearance of the fiber structure is avoided; (2) the fibers accumulated on the receiving substrate gradually become dispersed under the action of breeze airflow to form a fluffy fiber aggregate, so that the dependence of the electrostatic spinning fluffy fiber flocculus on a high-humidity environment is reduced; (3) under the induction of hot air, the cross-linking agent in the fiber is subjected to in-situ cross-linking reaction, bonding points are generated among the fluffy fibers due to the melt flow of the cross-linking agent, and meanwhile, the cross-linking agent micromolecules in the fiber are self-polymerized to form a macromolecular network, so that the mechanical property of single fibers is effectively improved, and the compression resilience of the fiber flocculus is enhanced.
According to the preparation method of the light-weight high-strength electrospun fiber flocculus, the minimum pore diameter in the finally prepared electrospun fiber flocculus is 0.1-5 mu m, the porosity reaches over 99%, the thickness is 15-50 mm, and the bulk density is 2-10 mg/cm3(ii) a The tensile strength is more than 1MPa, the compression rebound rate is more than 95 percent, and the thermal resistance value can reach 0.5-2 m2K/W。
When the existing electrostatic spinning fiber flocculus is subjected to stretching action, bonding points among fibers are firstly damaged, then the fibers slide, the flocculus structure is further damaged, and the external force bearing capacity of the flocculus is weak. The electrostatic spinning fiber flocculus is composed of the micro fibers and the nano fibers, the thick fiber diameter of the micro fibers provides mechanical support, and the thin diameter of the nano fibers effectively reduces the internal pore diameter of the flocculus and improves the flexibility of internal pore channels, so that air flow is avoided, the content of static air is effectively increased, and the heat preservation performance is improved. Meanwhile, the electrostatic spinning fiber flocculus can bear the action of external force except for bonding points among fibers, and the curling lasso structure provides higher tensile property. When the electrostatic spinning fiber flocculus is subjected to the stretching action, the single fiber is firstly changed into a straightening state from a curling state; furthermore, the fibers intertwined with each other bear external force, so that the tensile property of the fiber flocculus is effectively improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the electrostatic spinning fiber flocculus with the curled lasso structure is prepared by the crossed bidirectional electrostatic spinning device, the tensile property of the fiber flocculus is effectively improved by mutually nesting the curled fibers, and the tensile strength reaches more than 1 MPa; meanwhile, under the action of hot air flow of the positive-pressure hot air receiving device, in-situ crosslinking reaction occurs between fibers and inside the fibers, so that the fiber flocculus is endowed with excellent compression resilience (more than or equal to 95 percent); the nano-fiber effectively reduces the internal pore diameter of the flocculus, improves the flexibility of the pore passage, increases the content of static air and has the thermal resistance value of 0.5-2 m2K/W。
(2) The preparation method of the lightweight high-strength electrospun fiber flocculus can realize one-time continuous preparation of the electrospun flocculus, and is simple and efficient.
Drawings
FIG. 1 is a schematic view of a cross-type bidirectional electrospinning apparatus according to the present invention;
fig. 2 is a schematic view of a positive pressure hot air receiving device according to the present invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The cross-type bidirectional electrostatic spinning device disclosed by the invention is shown in figure 1 and comprises a spinning module I3 and a spinning module II 4 which are respectively connected with a positive voltage power supply 1 and a negative voltage power supply 2, and polymer charged jet streams 5 sprayed by the spinning module I3 and the spinning module II 4 are received on a positive-pressure hot air receiving device 6 to form an electrostatic spinning fiber flocculus 7.
The structure of the positive-pressure hot air receiving device 6 is shown in fig. 2, a hollow receiving substrate 9 with uniformly distributed hollow round holes 8 is arranged on the surface of the positive-pressure hot air receiving device, a metal wire heating device 11 is arranged at the bottom of the positive-pressure hot air receiving device, an adjustable-speed fan 12 is arranged below the metal wire heating device 11, and the adjustable-speed fan 12 blows hot air flow generated by the metal wire heating device 11 to the electrostatic spinning fiber flocculus 7 received on the surface of the positive-pressure hot air receiving device 6 from the hollow round holes 8 through an air flow pipeline 10.
Example 1
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 3, and the diameter of a spinning hole is 0.6 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.23m2The number of the hollow round holes on the surface is 16, and the diameter of the round holes is 3 mm. Then, polyacrylonitrile is dissolved in N, N-dimethylformamide to prepare polyacrylonitrile solutions with the concentrations of 31 wt% and 15 wt% (wherein the cross-linking agent is a trifunctional aziridine cross-linking agent, and the concentration is 13% of the mass of the polymer), the polyacrylonitrile solutions are injected into the first spinning module and the second spinning module through a liquid supply device, spinning process parameters are set, the spinning voltage is 50kV, the receiving distance is 20cm, the injection speed is 3mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 80%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 55 ℃ is blown out at the speed of 0.3m/s, the fibers are fluffy accumulated on the positive-pressure hot air receiving device and are subjected to cross-linking reaction under the action of hot air, and finally the electrostatic spinning fiber flocculus with the curling lasso structure is obtained。
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 350nm, the minimum aperture inside the flocculus is 0.9 mu m, the porosity is 99.2 percent, the thickness is 23mm, and the volume density is 5mg/cm3(ii) a The tensile strength is 1.4MPa, the compression rebound rate is 96 percent, and the thermal resistance value is 0.51m2K/W。
Example 2
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 4, and the diameter of a spinning hole is 0.5 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.3m2The number of the hollowed-out round holes on the surface is 36, and the diameter of each round hole is 4 mm. And then, dissolving polyvinyl alcohol in N, N-dimethylacetamide to respectively prepare 32 wt% and 13 wt% polyvinyl alcohol solutions (wherein the cross-linking agent is a trifunctional aziridine cross-linking agent, and the concentration is 10% of the mass of the polymer), injecting the polyvinyl alcohol solutions into a first spinning module and a second spinning module through a liquid supply device, setting spinning process parameters, wherein the spinning voltage is 60kV, the receiving distance is 25cm, the injection speed is 4mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 75%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 60 ℃ is blown out at the speed of 0.3m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 400nm, the minimum aperture inside the flocculus is 1.0 mu m, the porosity is 99.3 percent, the thickness is 30mm, and the volume density is 5.5mg/cm3(ii) a The tensile strength is 1.2MPa, the compression rebound rate is 95.5 percent, and the thermal resistance value is 0.52m2K/W。
Example 3
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross type bidirectional electrostatic spinning is builtThe number of needle type spray heads of the first spinning module and the second spinning module is respectively 5, and the diameter of a spinning hole is 0.5 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.1m2The number of the hollowed-out round holes on the surface is 20, and the diameter of each round hole is 2 mm. And then, dissolving polylactic acid in acetone to respectively prepare 35 wt% and 12 wt% polylactic acid solutions (wherein a cross-linking agent is diphenylmethane diisocyanate, and the concentration is 12% of the mass of the polymer), injecting the polylactic acid solutions into the first spinning module and the second spinning module through a liquid supply device, and setting spinning process parameters, wherein the spinning voltage is 70kV, the receiving distance is 30cm, the perfusion speed is 4mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 65%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 55 ℃ is blown out at the speed of 0.4m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3.5 mu m and nano fibers with the diameter of 500nm, the minimum pore diameter in the flocculus is 0.7 mu m, the porosity is 99.7 percent, the thickness is 26mm, and the volume density is 5mg/cm3(ii) a The tensile strength is 1.3MPa, the compression rebound rate is 96 percent, and the thermal resistance value is 0.59m2K/W。
Example 4
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 7, and the diameter of a spinning hole is 1.5 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.6m2The number of the hollowed-out round holes on the surface is 49, and the diameter of the round holes is 5 mm. Then, dissolving polystyrene in N, N-dimethylformamide to respectively prepare polystyrene solutions with the concentrations of 40 wt% and 15 wt% (wherein the cross-linking agent is triallyl isocyanurate, and the concentration is 12% of the mass of the polymer), injecting the polystyrene solutions into the first spinning module and the second spinning module through a liquid supply device, setting the spinning process parameters, setting the spinning voltage to be 90kV, and receiving the solutionThe distance is 35cm, the perfusion speed is 8mL/h, the spinning temperature is 30 ℃, and the ambient humidity is 70%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 60 ℃ is blown out at the speed of 0.5m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 4 mu m and nano fibers with the diameter of 600nm, the minimum aperture inside the flocculus is 2 mu m, the porosity is 99.9 percent, the thickness is 45mm, and the volume density is 3mg/cm3(ii) a The tensile strength is 1.0MPa, the compression rebound rate is 97 percent, and the thermal resistance value is 1.2m2K/W。
Example 5
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 6, and the diameter of a spinning hole is 2 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.4m2The number of the hollowed-out round holes on the surface is 36, and the diameter of each round hole is 3 mm. And then, dissolving polyvinyl chloride in dichloromethane to respectively prepare polyvinyl chloride solutions with the concentrations of 35 wt% and 10 wt% (wherein the cross-linking agent is dicumyl peroxide, and the concentration is 26% of the mass of the polymer), injecting the polyvinyl chloride solutions into the first spinning module and the second spinning module through a liquid supply device, setting spinning process parameters, wherein the spinning voltage is 65kV, the receiving distance is 35cm, the filling speed is 5mL/h, the spinning temperature is 25 ℃, and the environmental humidity is 50%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 0.6m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 2 mu m and nano fibers with the diameter of 100nm, the minimum aperture inside the flocculus is 0.6 mu m, the porosity is 99.0 percent, and the thickness is 15mmVolume density of 8mg/cm3(ii) a The tensile strength is 1.5MPa, the compression rebound rate is 95 percent, and the thermal resistance value is 0.67m2K/W。
Example 6
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 1, and the diameter of a spinning hole is 0.3 mm; the substrate of the positive pressure hot air receiving device is carbon fiber with the area of 0.1m2The number of the hollow round holes on the surface is 9, and the diameter of the round holes is 2 mm. Then, polybenzimidazole is dissolved in dimethylacetamide to prepare polyvinyl chloride solutions with the concentration of 25 wt% and 8 wt% (wherein the cross-linking agent is triallyl isocyanurate, and the concentration is 10% of the mass of the polymer), the polyvinyl chloride solutions are injected into the first spinning module and the second spinning module through a liquid supply device, the spinning process parameters are set, the spinning voltage is 30kV, the receiving distance is 20cm, the filling speed is 2mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 50%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 70 ℃ is blown out at the speed of 0.5m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 350nm, the minimum aperture inside the flocculus is 0.5 mu m, the porosity is 99.4 percent, the thickness is 20mm, and the volume density is 6mg/cm3(ii) a The tensile strength is 1.13MPa, the compression rebound rate is 96.4 percent, and the thermal resistance value is 0.68m2K/W。
Example 7
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 2, and the diameter of a spinning hole is 0.8 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.12m2The number of the hollow round holes on the surface is 16, and the diameter of the round holes is 3 mm. Subsequently, polyvinylidene fluoride is addedEthylene is dissolved in dimethyl sulfoxide to respectively prepare polyvinylidene fluoride solutions with the concentration of 50 wt% and 20 wt% (wherein the cross-linking agent is triallyl isocyanurate, the concentration is 5% of the mass of the polymer), the polyvinylidene fluoride solutions are injected into a spinning module I and a spinning module II through a liquid supply device, the spinning process parameters are set, the spinning voltage is 50kV, the receiving distance is 35cm, the injection speed is 5mL/h, the spinning temperature is 25 ℃, and the environmental humidity is 50%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 0.7m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 4 mu m and nano fibers with the diameter of 650nm, the minimum aperture inside the flocculus is 1.5 mu m, the porosity is 99.6 percent, the thickness is 20mm, and the volume density is 5mg/cm3(ii) a The tensile strength is 1.22MPa, the compression rebound rate is 97.1 percent, and the thermal resistance value is 0.57m2K/W。
Example 8
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 7, and the diameter of a spinning hole is 1 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.6m2The number of the hollow round holes on the surface is 64, and the diameter of the round holes is 3 mm. And then, dissolving polymethyl methacrylate in N, N-dimethylformamide to respectively prepare polymethyl methacrylate solutions with the concentrations of 40 wt% and 15 wt% (wherein the cross-linking agent is p-toluenesulfonic acid, and the concentration is 30% of the mass of the polymer), injecting the solutions into a first spinning module and a second spinning module through a liquid supply device, setting spinning process parameters, the spinning voltage is 70kV, the receiving distance is 45cm, the filling speed is 6mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 60%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 1m/s, and the fibers are fluffy and stacked on the positive pressure hot air receiving deviceAnd (3) carrying out a crosslinking reaction on the device under the action of hot air, and finally obtaining the electrostatic spinning fiber flocculus with a curled lasso structure.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 2 mu m and nano fibers with the diameter of 150nm, the minimum aperture inside the flocculus is 0.1 mu m, the porosity is 99.0 percent, the thickness is 39mm, and the volume density is 3mg/cm3(ii) a The tensile strength is 1.02MPa, the compression rebound rate is 95.1 percent, and the thermal resistance value is 0.86m2K/W。
Example 9
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 6, and the diameter of a spinning hole is 0.8 mm; the substrate of the positive pressure hot air receiving device is made of carbon fiber and has an area of 0.34m2The number of the hollowed-out round holes on the surface is 36, and the diameter of each round hole is 4 mm. And then, dissolving polyacrylonitrile and polymethyl methacrylate in N, N-dimethylformamide to prepare 45 wt% and 15 wt% polyacrylonitrile/polymethyl methacrylate mixed solution (wherein the cross-linking agent is a trifunctional aziridine cross-linking agent, and the concentration is 20% of the mass of the polymer), respectively injecting the two solutions into a first spinning module and a second spinning module through a liquid supply device, and setting spinning process parameters, wherein the spinning voltage is 80kV, the receiving distance is 35cm, the injection speed is 4mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 70%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 0.5m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 5 mu m and nano fibers with the diameter of 200nm, the minimum pore diameter in the flocculus is 3 mu m, the porosity is 99.9 percent, the thickness is 40mm, and the volume density is 2mg/cm3(ii) a The tensile strength is 1.0MPa, the compression rebound rate is 98.4 percent, and the thermal resistance value is 0.89m2K/W。
Example 10
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 8, and the diameter of a spinning hole is 1.5 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.55m2The number of the hollow round holes on the surface is 100, and the diameter of the round holes is 5 mm. And then, dissolving polyethyleneimine in water to prepare polyethyleneimine solutions with the concentrations of 50 wt% and 15 wt% (wherein the cross-linking agent is diphenylmethane diisocyanate, and the concentration is 15% of the mass of the polymer), injecting the two solutions into the first spinning module and the second spinning module through a liquid supply device respectively, setting spinning process parameters, the spinning voltage is 50kV, the receiving distance is 30cm, the injection speed is 4mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 45%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 70 ℃ is blown out at the speed of 1.0m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 200nm, the minimum aperture inside the flocculus is 0.4 mu m, the porosity is 99.1 percent, the thickness is 15mm, and the volume density is 8mg/cm3(ii) a The tensile strength is 1.5MPa, the compression rebound rate is 95.0 percent, and the thermal resistance value is 0.5m2K/W。
Example 11
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps: firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is 8 respectively, and the diameter of a spinning hole is 1.3 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.33m2The number of the hollowed-out round holes on the surface is 35, and the diameter of each round hole is 5 mm. Subsequently, polycaprolactone was dissolved in N, N-dimethylformamide to give 40 wt.% and 15 wt.% polycaprolactone solutions (wherein the crosslinker is hexamethylene diisocyanate and the concentration is 20% of the mass of the polymer), and the two solutions were separately dissolvedAnd injecting the liquid into the first spinning module and the second spinning module through the liquid supply device, setting spinning process parameters, wherein the spinning voltage is 90kV, the receiving distance is 40cm, the injection speed is 6mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 50%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 55 ℃ is blown out at the speed of 0.8m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 6 mu m and nano fibers with the diameter of 500nm, the minimum aperture inside the flocculus is 4 mu m, the porosity is 99.7 percent, the thickness is 50mm, and the volume density is 4mg/cm3(ii) a The tensile strength is 1.12MPa, the compression rebound rate is 96.4 percent, and the thermal resistance value is 1.33m2K/W。
Example 12
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 6, and the diameter of a spinning hole is 1.5 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.19m2The number of the hollowed-out round holes on the surface is 20, and the diameter of each round hole is 4 mm. And then, dissolving polytrimethylene terephthalate in toluene to prepare polytrimethylene terephthalate solutions with the concentration of 40 wt% and 15 wt% (wherein the cross-linking agent is triallyl isocyanurate, and the concentration is 15% of the mass of the polymer), injecting the two solutions into a first spinning module and a second spinning module through a liquid supply device respectively, and setting spinning process parameters, wherein the spinning voltage is 70kV, the receiving distance is 25cm, the perfusion speed is 5mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 45%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 60 ℃ is blown out at the speed of 1.0m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 500nm, the minimum aperture inside the flocculus is 2 mu m, the porosity is 99.4 percent, the thickness is 25mm, and the volume density is 6mg/cm3(ii) a The tensile strength is 1.35MPa, the compression rebound rate is 97.4 percent, and the thermal resistance value is 0.74m2K/W。
Example 13
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 5, and the diameter of a spinning hole is 0.6 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.2m2The number of the hollow round holes on the surface is 25, and the diameter of the round holes is 4 mm. Then, polysulfone is dissolved in N, N-dimethylacetamide to prepare polysulfone solutions with the concentration of 50 wt% and 15 wt% (wherein the cross-linking agent is triallyl isocyanurate, and the concentration is 20% of the polymer mass), the two solutions are respectively injected into a first spinning module and a second spinning module through a liquid supply device, and the spinning process parameters are set, the spinning voltage is 80kV, the receiving distance is 30cm, the filling speed is 5mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 70%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 60 ℃ is blown out at the speed of 0.1m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 4 mu m and nano fibers with the diameter of 600nm, the minimum aperture inside the flocculus is 3 mu m, the porosity is 99.1 percent, the thickness is 35mm, and the volume density is 5mg/cm3(ii) a The tensile strength is 1.25MPa, the compression rebound rate is 98.4 percent, and the thermal resistance value is 0.87m2K/W。
Example 14
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is builtThe number of the needle type spray heads of the first spinning module and the second spinning module is 8 respectively, and the diameter of each spinning hole is 1.5 mm; the substrate of the positive pressure hot air receiving device is made of conductive rubber and has an area of 0.6m2The number of the hollow round holes on the surface is 25, and the diameter of the round holes is 5 mm. And then, dissolving polysulfone and polyvinylidene fluoride in N, N-dimethylacetamide to prepare 50 wt% and 15 wt% polysulfone/polyvinylidene fluoride mixed solutions (wherein the cross-linking agent is a trifunctional aziridine cross-linking agent, and the concentration is 20% of the mass of the polymer), respectively injecting the two solutions into a spinning module I and a spinning module II through a liquid supply device, and setting spinning process parameters, wherein the spinning voltage is 60kV, the receiving distance is 45cm, the injection speed is 6mL/h, the spinning temperature is 25 ℃, and the environmental humidity is 80%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 60 ℃ is blown out at the speed of 0.6m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 5 mu m and nano fibers with the diameter of 350nm, the minimum aperture inside the flocculus is 2.5 mu m, the porosity is 99.5 percent, the thickness is 50mm, and the volume density is 2.6mg/cm3(ii) a The tensile strength is 1.09MPa, the compression rebound rate is 98.8 percent, and the thermal resistance value is 2m2K/W。
Example 15
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 7, and the diameter of a spinning hole is 1.8 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.47m2The number of the hollow round holes on the surface is 64, and the diameter of the round holes is 5 mm. Then, polyimide is dissolved in N, N-dimethylacetamide to prepare polyimide solutions with the concentration of 50 wt% and 15 wt% (wherein the cross-linking agent is hexamethylene diisocyanate, and the concentration is 15% of the mass of the polymer), and the two solutions are respectively injected into a first spinning module and a second spinning module through a liquid supply deviceAnd setting spinning process parameters of a second silk module, wherein the spinning voltage is 80kV, the receiving distance is 35cm, the perfusion speed is 5mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 50%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 0.6m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 3 mu m and nano fibers with the diameter of 300nm, the minimum aperture inside the flocculus is 0.8 mu m, the porosity is 99.2 percent, the thickness is 20mm, and the volume density is 6mg/cm3(ii) a The tensile strength is 1.31MPa, the compression rebound rate is 96.8 percent, and the thermal resistance value is 0.63m2K/W。
Example 16
A preparation method of an electrostatic spinning fiber flocculus comprises the following steps:
firstly, a cross-type bidirectional electrostatic spinning device is built, the number of needle type spray heads of a first spinning module and a second spinning module is respectively 6, and the diameter of a spinning hole is 0.9 mm; the substrate of the positive pressure hot air receiving device is made of metal stainless steel and has an area of 0.42m2The number of the hollow round holes on the surface is 81, and the diameter of the round holes is 5 mm. Then, polysulfone and polymethyl methacrylate are dissolved in N, N-dimethylformamide to prepare 50 wt% and 10 wt% polysulfone/polymethyl methacrylate mixed solution (wherein the cross-linking agent is a trifunctional aziridine cross-linking agent, and the concentration is 15% of the polymer mass), the two solutions are respectively injected into a first spinning module and a second spinning module through a liquid supply device, and spinning process parameters are set, the spinning voltage is 80kV, the receiving distance is 45cm, the injection speed is 6mL/h, the spinning temperature is 25 ℃, and the ambient humidity is 70%. When the micro-fibers and the nano-fibers begin to fall on the receiving substrate, the self-heating hot air device is started, hot air flow with the temperature of 65 ℃ is blown out at the speed of 0.7m/s, the fibers are fluffy and stacked on the positive-pressure hot air receiving device, and a crosslinking reaction is carried out under the action of hot air, so that the electrostatic spinning fiber flocculus with the curling lasso structure is finally obtained.
The electrostatic spinning fiber flocculus finally prepared consists of micron fibers with the diameter of 4 mu m and nano fibers with the diameter of 350nm, the minimum aperture inside the flocculus is 0.8 mu m, the porosity is 99.7 percent, the thickness is 35mm, and the volume density is 5mg/cm3(ii) a The tensile strength is 1.26MPa, the compression rebound rate is 97.6 percent, and the thermal resistance value is 0.97m2K/W。

Claims (10)

1. A preparation method of electrostatic spinning fiber flocculus is characterized in that spinning solution A and spinning solution B with different concentrations are subjected to electrostatic spinning through a cross-type bidirectional electrostatic spinning device to respectively spin micrometer fibers and nanometer fibers, the micrometer fibers and the nanometer fibers are accumulated on a positive-pressure hot air receiving device in a curling shape, and in-situ crosslinking reaction is carried out under the action of hot air to finally obtain the electrostatic spinning fiber flocculus; the crossed bidirectional electrostatic spinning device comprises a spinning module I (3) and a spinning module II (4) which are respectively connected with a positive voltage power supply (1) and a negative voltage power supply (2), polymer charged jet streams (5) sprayed by the spinning module I (3) and the spinning module II (4) are received on a positive pressure hot air receiving device (6) to form electrostatic spinning fiber flocculus (7), the spinning module I (3) and the spinning module II (4) are not parallel to each other, and the spinning directions of the spinning module I (3) and the spinning module II (4) are inclined to opposite directions; the electrostatic spinning fiber flocculus is characterized in that a hollowed-out receiving substrate (9) with hollowed-out round holes (8) uniformly distributed is arranged on the surface of the positive-pressure hot air receiving device (6), a metal wire heating device (11) is arranged at the bottom of the positive-pressure hot air receiving device, an adjustable-speed fan (12) is arranged below the metal wire heating device (11), and hot air flow generated by the adjustable-speed fan (12) and the metal wire heating device (11) is blown to an electrostatic spinning fiber flocculus (7) received on the surface of the positive-pressure hot air receiving device (6) from the hollowed-out round holes (8.
2. The method for preparing electrospun fiber flakes according to claim 1, wherein the mass concentration of the spinning solution a is 25-60% and the mass concentration of the spinning solution B is 5-25%.
3. The method of claim 1, wherein the dope a and the dope B are the same and are prepared by dissolving and stirring a polymer in a solvent, and adding a cross-linking agent; the polymer is at least one of polyacrylonitrile, polyamide, polyvinyl alcohol, polylactic acid, polyethylene oxide, polyvinyl chloride, polyvinylidene fluoride, polystyrene, polybenzimidazole, polycarbonate, polymethyl methacrylate, polytrimethylene terephthalate, polyethylene terephthalate, polycaprolactone, polyhydroxybutyrate, polysulfone, polyethyleneimine, polyvinyl butyral, polyethylene, polyimide and aramid 1313; the solvent is at least one of N, N-dimethylformamide, N-dimethylacetamide, methanol, ethanol, formic acid, acetic acid, dimethyl sulfoxide, toluene, acetone, cyclohexane, isobutanol, dichloromethane, butyl acetate, ethyl acetate and chloroform; the crosslinking agent is at least one of trifunctional aziridine crosslinking agent, diphenylmethane diisocyanate, p-toluenesulfonic acid, hexamethylene diisocyanate, dicumyl peroxide and triallyl isocyanurate, and the addition amount of the crosslinking agent is 0.5-30% of the mass of the polymer.
4. The method of claim 1, wherein the microfibers have a diameter of 2 to 7 μm and the nanofibers have a diameter of 100 to 700 nm.
5. The method of claim 1 wherein the electrospinning process parameters are: the voltage is 30-90 kV, the receiving distance is 10-50 cm, the filling speed is 0.1-10 mL/h, the spinning temperature is 20-40 ℃, and the environmental humidity is 45-80%.
6. The method for preparing the electrospun fiber batt of claim 1, wherein the first spinning module (3) and the second spinning module (4) are formed by juxtaposing needle type spray heads, wherein the number of the needle type spray heads is 1-8, and the diameter of the spinning hole is 0.1-2 mm.
7. A process for preparing electrospun fiber batts according to claim 1 wherein the straight openings 8 are straightThe diameter is 1-5 mm, and the number is 9-121; the hollowed receiving substrate (9) is made of any one of conductive rubber, metal stainless steel and carbon fiber; the air outlet of the airflow pipeline (10) is the same as the hollow receiving substrate (9) in size and shape, and the area is specifically 0.08-1 m2。
8. The method of claim 1 wherein the flow rate of the hot air stream from the positive pressure hot air receiver is 0.1 to 1m/s and the temperature is 50 to 70 ℃.
9. An electrospun fiber batt made by the process of making an electrospun fiber batt of any of claims 1-8.
10. The electrospun fiber batt of claim 9 having an internal minimum pore diameter of 0.1 to 5 μm, a porosity of not less than 99%, a thickness of 15 to 50mm, and a bulk density of 2 to 10mg/cm3Tensile strength of not less than 1MPa, compression rebound rate of not less than 95 percent and thermal resistance value of not less than 0.5-2 m2K/W。
CN202110159088.1A 2021-02-05 2021-02-05 Electrostatic spinning fiber flocculus and preparation method thereof Pending CN112981718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110159088.1A CN112981718A (en) 2021-02-05 2021-02-05 Electrostatic spinning fiber flocculus and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110159088.1A CN112981718A (en) 2021-02-05 2021-02-05 Electrostatic spinning fiber flocculus and preparation method thereof

Publications (1)

Publication Number Publication Date
CN112981718A true CN112981718A (en) 2021-06-18

Family

ID=76347361

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110159088.1A Pending CN112981718A (en) 2021-02-05 2021-02-05 Electrostatic spinning fiber flocculus and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112981718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114892288A (en) * 2022-04-28 2022-08-12 上海迅江科技有限公司 Enhanced flash evaporation/electrostatic spinning composite spinning equipment

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100078811A (en) * 2008-12-30 2010-07-08 주식회사 효성 Electrospinning device
CN101807394A (en) * 2010-04-13 2010-08-18 王艳 Micro-nano-fiber composite layered sound-absorbing material
KR101400280B1 (en) * 2013-06-19 2014-05-28 (주)우리나노필 An apparatus for electrospinning
KR20140069511A (en) * 2012-11-29 2014-06-10 (주)우리나노필 An apparatus for electrospinning
CN107604536A (en) * 2017-09-12 2018-01-19 曾林涛 A kind of preparation method of fluffy resilient three-dimensional micro nanometer fiber material, device and the fibrous material prepared by this method and its application
CN108588860A (en) * 2018-05-03 2018-09-28 东华大学 A kind of reception device of regulation and control Electrospun nano-fibers aggregate packing structure
CN109778429A (en) * 2019-01-11 2019-05-21 浙江农林大学暨阳学院 A kind of fiber membrane preparation device of high extensibility and preparation method thereof
CN111575904A (en) * 2020-05-21 2020-08-25 东华大学 Super-elastic waterproof breathable skin dressing with folded structure and preparation method thereof
CN111926462A (en) * 2020-07-06 2020-11-13 诺一迈尔(苏州)生命科技有限公司 Medical sponge and preparation method thereof
CN112095158A (en) * 2020-09-14 2020-12-18 青岛大学 Flexible inorganic nanofiber yarn and preparation method thereof

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100078811A (en) * 2008-12-30 2010-07-08 주식회사 효성 Electrospinning device
CN101807394A (en) * 2010-04-13 2010-08-18 王艳 Micro-nano-fiber composite layered sound-absorbing material
KR20140069511A (en) * 2012-11-29 2014-06-10 (주)우리나노필 An apparatus for electrospinning
KR101400280B1 (en) * 2013-06-19 2014-05-28 (주)우리나노필 An apparatus for electrospinning
CN107604536A (en) * 2017-09-12 2018-01-19 曾林涛 A kind of preparation method of fluffy resilient three-dimensional micro nanometer fiber material, device and the fibrous material prepared by this method and its application
CN108588860A (en) * 2018-05-03 2018-09-28 东华大学 A kind of reception device of regulation and control Electrospun nano-fibers aggregate packing structure
CN109778429A (en) * 2019-01-11 2019-05-21 浙江农林大学暨阳学院 A kind of fiber membrane preparation device of high extensibility and preparation method thereof
CN111575904A (en) * 2020-05-21 2020-08-25 东华大学 Super-elastic waterproof breathable skin dressing with folded structure and preparation method thereof
CN111926462A (en) * 2020-07-06 2020-11-13 诺一迈尔(苏州)生命科技有限公司 Medical sponge and preparation method thereof
CN112095158A (en) * 2020-09-14 2020-12-18 青岛大学 Flexible inorganic nanofiber yarn and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114892288A (en) * 2022-04-28 2022-08-12 上海迅江科技有限公司 Enhanced flash evaporation/electrostatic spinning composite spinning equipment
CN114892288B (en) * 2022-04-28 2023-02-28 上海迅江科技有限公司 Enhanced flash evaporation/electrostatic spinning composite spinning equipment
WO2023208010A1 (en) * 2022-04-28 2023-11-02 上海迅江科技有限公司 Flash spinning/electrostatic spinning-based composite superfine nanofiber material and preparation method therefor
WO2023207293A1 (en) * 2022-04-28 2023-11-02 上海迅江科技有限公司 Enhancement-type combined flash evaporation/electrostatic spinning apparatus

Similar Documents

Publication Publication Date Title
Szewczyk et al. The impact of relative humidity on electrospun polymer fibers: From structural changes to fiber morphology
Dadol et al. Solution blow spinning (SBS) and SBS-spun nanofibers: Materials, methods, and applications
CN106450101B (en) A method of preparing lithium battery diaphragm with coaxial electrostatic spinning
Subbiah et al. Electrospinning of nanofibers
Zhang et al. Centrifugal spinning: an alternative approach to fabricate nanofibers at high speed and low cost
EP3040462B1 (en) Producing method for enhancing electrostatic spinning nanofiber membrane
CN111485329B (en) Nanofiber flocculus with sandwich structure and preparation method thereof
CN111455474B (en) Wool-like crimped electrostatic spinning nanofiber and preparation method thereof
CN112981712B (en) Fiber composite thermal insulating flocculus and preparation method thereof
CN113149655B (en) Method for preparing three-dimensional nanofiber ceramic aerogel through eddy current field assisted-electrostatic spinning
CN107604536B (en) Preparation method and device of fluffy elastic three-dimensional micro-nano fiber material, fiber material prepared by method and application of fiber material
KR101309074B1 (en) Manufacturing Method of Carbon Nanofiber Strand
Wan Bubble electrospinning and bubble-spun nanofibers
CN111575917B (en) High-specific-surface-area honeycomb-like structure nanofiber material and preparation method thereof
CN109289328A (en) A kind of height dielectric polymer composite electret filter materials and preparation method thereof
CN111376553B (en) Interpenetrating network type elastic fiber sound-absorbing sponge with sandwich structure and preparation method thereof
CN106435841A (en) Polyacrylonitrile porous carbon fiber preparation method
Zhou et al. Novel method for preparation of continuously twisted nanofiber yarn based on a combination of stepped airflow electrospinning and friction twisting
Nayak et al. Nano fibres by electro spinning: Properties and applications
WO2023207293A1 (en) Enhancement-type combined flash evaporation/electrostatic spinning apparatus
CN112981718A (en) Electrostatic spinning fiber flocculus and preparation method thereof
Figen History, basics, and parameters of electrospinning technique
JP5829554B2 (en) Method for producing nanofiber laminate
WO2023024497A1 (en) Polylactic acid nano double-layer fiber membrane filter element and preparation method therefor
Li et al. Electrospinning technology in non-woven fabric manufacturing

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210618