CN115416382A - Hollow micro-nanofiber non-woven material with laminated structure and preparation method and application thereof - Google Patents

Hollow micro-nanofiber non-woven material with laminated structure and preparation method and application thereof Download PDF

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Publication number
CN115416382A
CN115416382A CN202211073265.5A CN202211073265A CN115416382A CN 115416382 A CN115416382 A CN 115416382A CN 202211073265 A CN202211073265 A CN 202211073265A CN 115416382 A CN115416382 A CN 115416382A
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laminated structure
layer
woven material
fiber
hollow micro
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CN115416382B (en
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傅秋霞
单浩如
谢单单
葛建龙
张伟
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Nantong University
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Nantong University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022Non-woven fabric
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00Materials specially adapted for outerwear
    • A41D31/04Materials specially adapted for outerwear characterised by special function or use
    • A41D31/06Thermally protective, e.g. insulating
    • A41D31/065Thermally protective, e.g. insulating using layered materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B32B5/265Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a non-woven fabric layer
    • B32B5/266Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a non-woven fabric layer next to one or more non-woven fabric layers
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01DMECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00Formation of filaments, threads, or the like
    • D01D5/0007Electro-spinning
    • D01D5/0015Electro-spinning characterised by the initial state of the material
    • D01D5/003Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
    • D01D5/0046Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion the fibre formed by coagulation, i.e. wet electro-spinning
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01DMECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00Formation of filaments, threads, or the like
    • D01D5/24Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/42Non-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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282Addition polymers
    • D04H1/43Acrylonitrile series
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/42Non-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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43838Ultrafine fibres, e.g. microfibres
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/42Non-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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4391Non-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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres
    • D04H1/43914Non-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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece characterised by the shape of the fibres hollow fibres
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/44Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-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
    • D04H1/44Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498Non-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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/033 layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/20All layers being fibrous or filamentary
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02Synthetic macromolecular fibres
    • B32B2262/0246Acrylic resin fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/304Insulating

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Artificial Filaments (AREA)

Abstract

The invention relates to the technical field of functional textile materials, in particular to a hollow micro-nanofiber non-woven material with a laminated structure and a preparation method and application thereof, and the hollow micro-nanofiber non-woven material comprises the following steps: (1) Completely dissolving polyacrylonitrile powder in a solvent, and then adding far infrared nano particles and uniformly dispersing; (2) The method comprises the following steps of taking a polyacrylonitrile/far infrared nanoparticle mixed solution as a shell layer, taking temperature-controllable wet air as a core layer, spinning by using a coaxial electrostatic spinning method, receiving spun fibers by using a liquid coagulation tank, and preparing a laminated structure micro-nano fiber assembly with different fiber diameters and hollowness by regulating and controlling the properties of a spinning solution and spinning process parameters in a gradient manner; (3) And reinforcing the micro-nanofiber aggregate by a spunlace method to prepare the hollow micro-nanofiber non-woven material with the laminated structure. The laminated structure hollow micro-nanofiber non-woven material can be used for designing and developing high-performance cold-proof warm-keeping textile products and safety protective clothing.

Description

Hollow micro-nanofiber non-woven material with laminated structure and preparation method and application thereof
Technical Field
The invention relates to the technical field of functional textile materials, in particular to a hollow micro-nanofiber non-woven material with a laminated structure and a preparation method and application thereof.
Background
The cold environment at low temperature easily causes frostbite of human body, causes the immunity of the organism to be reduced, and causes cardiovascular and respiratory system diseases, thus seriously affecting the health and life safety of people. Therefore, it is necessary to wear cold-proof clothes having a warm-keeping function to resist the harm of the severe cold environment to the human body. At present, the common thermal filling materials for cold-proof thermal garments are mainly down fibers, which have good thermal properties, but face the disadvantages of low yield, high cost, complex processing and treatment processes, and the like, thereby greatly limiting the practical application thereof.
The hollow fiber contains a large amount of static air, so that the heat preservation performance of the fiber material can be effectively improved, and the hollow fiber is expected to become a good substitute of down fiber. At present, most researchers introduce hollow fibers into the yarn preparation process, add hollow short fibers into common solid fiber raw materials, further spin blended yarns containing the hollow fibers through the procedures of carding, drawing, roving, spinning and the like, and then weave the hollow fiber blended yarns into the thermal fabric containing the hollow fibers by using a weaving or knitting technology. However, the spinning and twisting action causes the hollow fibers to be closely arranged in the yarns, so that the structural advantages of the hollow fibers are limited, and the heat-insulating property of the material cannot be greatly improved. In addition, some researchers mix the hollow micro short fibers and the solid micro short fibers, and mix the hollow micro short fibers with the nano short fibers, and further prepare the three-dimensional hollow fiber thermal insulating flocculus (CN 111648025B) by carding, web forming, fiber web laminating and thermal bonding methods, but the nano effect of the nano short fibers causes the nano short fibers to be easily and electrostatically adsorbed on a mechanism in carding and web forming equipment in the carding process, so that the distribution uniformity of the nano fibers is difficult to control, the structure of the nano fibers is easily damaged in the carding process, and the structural forming and the thermal insulating performance of the flocculus material are not greatly improved. Recently, chinese patent CN114714693A reports a nanofiber thermal insulation material and a preparation method thereof, the light and thin nanofiber thermal insulation and moisture permeable fabric comprises an outer layer support fabric, a nanofiber far infrared waterproof moisture permeable layer, a nanofiber thermal insulation layer and a heating fabric, but paraffin oil is used as an inner core to prepare a polyurethane hollow nanofiber thermal insulation layer, and a paraffin inner core layer of polyurethane nanofibers needs to be removed by using an organic solvent soaking method subsequently, however, the structure with good nanofiber continuity leads to difficulty in completely removing the paraffin inner core layer inside, the preparation process is complex, and the production cost is high.
Therefore, the present application needs to provide a hollow micro-nanofiber nonwoven material with a laminated structure, and a preparation method and an application thereof, so as to solve the above related technical problems.
Disclosure of Invention
Aiming at the problems, the invention provides a hollow micro-nanofiber non-woven material with a laminated structure and a preparation method and application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a hollow micro-nanofiber non-woven material of laminated structure, includes upper epidermis, lower top layer and locates the intermediate level between upper epidermis and the lower top layer, upper epidermis and lower top layer are the fibre and pile up inseparable hollow nanofiber layer, the intermediate level is the fibre and piles up fluffy hollow microfiber layer, and the thickness of intermediate level is greater than the thickness on upper epidermis and lower top layer.
Preferably, in the upper surface layer and the lower surface layer, the fiber diameter is 0.2-1 μm, the hollowness is 20-40%, the thickness of the fiber layer is 0.5-2 mm, and the fiber bulk density is 10-15 mg/cm 3 (ii) a In the intermediate layer, the fiber diameter is 1-3 μm, the hollowness is 50-80%, the fiber layer thickness is 10-25 mm, and the fiber bulk density is 3-8 mg/cm 3
Preferably, the thermal conductivity of the laminated hollow micro-nanofiber non-woven material is 0.025-0.029W/(m.K).
The invention also provides a preparation method of the hollow micro-nanofiber non-woven material with the laminated structure, which comprises the following steps:
step 1, dissolving polyacrylonitrile powder in a solvent, then adding far infrared nano particles and uniformly dispersing to obtain a polyacrylonitrile/far infrared nano particle mixed solution;
step 2, taking a polyacrylonitrile/far infrared nanoparticle mixed solution as a shell layer, taking temperature-controllable wet air as a core layer, spinning by using a coaxial electrostatic spinning method, receiving spun fibers by using a liquid coagulation tank, and preparing a laminated structure micro-nano fiber aggregate with different fiber diameters and hollowness by regulating and controlling the properties of a spinning solution and spinning process parameters in a gradient manner;
and 3, carrying out spunlace reinforcement on the micro-nano fiber aggregate with the laminated structure obtained in the step 2, and then carrying out air blowing and drying to prepare the hollow micro-nano fiber non-woven material with the laminated structure.
Preferably, in step 1, the solvent is one or more of N, N-dimethylformamide, dimethyl sulfoxide and sulfolane; the far infrared nano-particles are one or more of carbon nano-tubes, graphene, tourmaline powder and ceramic nano-particles;
wherein, in the polyacrylonitrile/far infrared nano particle mixed solution, the mass concentration of the polyacrylonitrile is 5 to 35 weight percent, and the mass concentration of the far infrared nano particles is 0.1 to 5 weight percent.
Preferably, in the step 2, coaxial spinneret orifices for coaxial electrostatic spinning are arranged in an array manner, a shell layer of the coaxial spinneret orifices is filled with the polyacrylonitrile/far infrared nanoparticle mixed solution obtained in the step 1, and a medium filled in a core layer of the coaxial spinneret orifices is temperature-controllable wet air;
wherein the temperature of the temperature-controllable humid air is 30-40 ℃, and the humidity is 80-95%;
wherein the liquid contained in the solidification tank is deionized water;
wherein, the hollow micro-nanofiber in the fiber aggregate has continuity.
Preferably, in the step 2, the perfusion speed of the shell polymer solution of the coaxial spinneret orifice is 1-10 mL/h, the flow rate of the wet air of the nuclear layer is 1-20 m/s, the voltage is 10-50 kV, the distance between the spinneret orifice and the liquid level of the liquid coagulation pool is 10-50 cm, the ambient temperature is 15-30 ℃, and the ambient humidity is 30-70%.
The invention also provides application of the hollow micro-nanofiber non-woven material with the laminated structure in the field of cold protection and warm keeping.
Adopt above-mentioned technical scheme: the laminated structure mainly means that on the longitudinal section of the non-woven material, the upper surface layer and the lower surface layer are hollow nanofiber layers with smaller thickness, and the hollow nanofibers are tightly stacked, so that air convection in the non-woven material can be effectively reduced; the middle layer is a hollow micro-fiber layer, the larger diameter of the middle layer enables the middle layer to have larger bending rigidity, the longitudinal structures of the upper hollow nano-fiber layer and the lower hollow nano-fiber layer can be effectively supported, the hollow micro-fiber is stacked to be fluffy, and the static air content of the non-woven material can be effectively improved by the hollow structure of the micro-nanofiber and the multilayer laminated stacking structure; in addition, far infrared nano particles contained in the hollow fiber tube wall can effectively absorb and radiate far infrared rays, so that the hollow fiber tube has high-efficiency cold-proof and warm-keeping performance.
The invention has the beneficial effects that:
1. the invention adopts a coaxial electrostatic spinning method to prepare the hollow micro-nanofiber, which is different from the traditional core-shell electrostatic spinning method, the temperature-controllable wet air is loaded on the core layer, and the wet air with a certain temperature can promote the polyacrylonitrile/far infrared nanoparticle mixed spinning solution to generate rapid phase separation to form a stable hollow core layer, thereby effectively avoiding the collapse of a hollow structure; in addition, because the core layer uses the air medium, the subsequent process does not need to adopt an organic solvent soaking method to remove the hollow structure template medium of the core layer, the spinning speed of the hollow fiber can be effectively improved, the use of the organic solvent is reduced, and the production cost is reduced.
2. According to the invention, the electrostatic spinning hollow micro-nano fiber is received by adopting the coagulation bath, the mass concentration and the spinning process parameters of polyacrylonitrile and far infrared nano particles in a spinning solution are regulated and controlled in a gradient manner to prepare the micro-nano fiber aggregate with the laminated structure with different fiber diameters and hollowness, and the fiber aggregate is reinforced by a spunlace process, so that the upper hollow nano fiber layer and the lower hollow nano fiber layer of the prepared non-woven thermal insulation material have higher stacking density, the convection of air in the material can be reduced, the loosely stacked hollow micro-fiber intermediate layer has higher porosity, and the storage capacity of the non-woven material to static air can be effectively improved by the coupling effect of the non-woven thermal insulation material and the hollow fiber, thereby the thermal insulation performance of the material is improved.
3. Far infrared particles doped in the tube wall of the hollow micro-nanofiber non-woven material with the laminated structure can effectively absorb and radiate far infrared rays, so that the heat preservation performance of the non-woven material can be further improved, and the prepared material is expected to be applied to design and development of novel efficient cold-proof heat-preservation textiles and safety protective clothing.
Detailed Description
The technical solutions of the present invention are further illustrated and described below by specific embodiments, but the embodiments of the present invention are not limited thereto.
Example 1: a preparation method of a hollow micro-nanofiber non-woven material with a laminated structure comprises the following steps:
step 1, weighing polyacrylonitrile powder, dispersing the polyacrylonitrile powder in N, N-dimethylformamide, stirring the mixture at room temperature until the polyacrylonitrile powder is completely dissolved, then adding carbon nano tubes into the solution, and uniformly dispersing the carbon nano tubes by ultrasonic waves to obtain spinning solutions of upper-layer fibers and lower-layer fibers, wherein the mass concentration of polyacrylonitrile in the spinning solution is 8wt%, and the mass concentration of the carbon nano tubes is 0.5wt%; preparing a spinning solution of the middle layer fiber by the same method, wherein the mass concentration of polyacrylonitrile in the spinning solution is 33wt%, and the mass concentration of the carbon nano tube is 1wt%;
step 2, spinning the spinning solution obtained in the step 1 by adopting a coaxial electrostatic spinning technology, wherein the spun fiber is received in a square deionized water coagulation bath pool, when the fibers of the upper and lower surface layers are spun, the perfusion speed of the polymer solution of the shell layer of the coaxial spinning nozzle is 1mL/h, the voltage is 35kV, the distance between the spinning nozzle and the receiving liquid level is 15cm, the environmental temperature is 25 ℃, the environmental humidity is 35%, and the flow velocity of the air of the nuclear layer of the coaxial spinning nozzle is 2m/s; when the middle layer fiber is spun, the perfusion speed of the shell polymer solution of the coaxial spinneret orifice is 3mL/h, the voltage is 20kV, the distance between the spinneret orifice and the receiving liquid level is 25cm, the environmental temperature is 25 ℃, the environmental humidity is 70 percent, and the flow speed of the core layer air of the coaxial spinneret orifice is 18m/s; the temperature of the wet air of the nuclear layer is 35 ℃ and the humidity is 90 percent;
and 3, carrying out spunlace treatment on the hollow micro-nanofiber aggregate with the laminated structure obtained in the step 2, and then drying in a forced air oven to prepare the hollow micro-nanofiber non-woven material with the laminated structure. The average diameter of the hollow nanofibers in the upper and lower surface layers of the laminated nonwoven material was about 0.3 μm, the hollowness was about 23%, the thickness of the fiber layer was 2mm, and the bulk density was 14.5mg/cm 3 (ii) a The average diameter of hollow micro-fiber in the middle layer is about 2.5 μm, the hollowness is about 68%, the thickness of the fiber layer is 23mm, and the bulk density is 4mg/cm 3 (ii) a The prepared hollow micro-nanofiber non-woven material with the laminated structure has the thermal conductivity coefficient of 0.0253W/(m.K).
Example 2: a preparation method of a hollow micro-nanofiber non-woven material with a laminated structure comprises the following steps:
step 1, weighing polyacrylonitrile powder, dispersing the polyacrylonitrile powder in N, N-dimethylformamide, stirring the mixture at room temperature until the polyacrylonitrile powder is completely dissolved, then adding graphene into the solution, and performing ultrasonic dispersion to obtain spinning solutions of upper-layer fibers and lower-layer fibers, wherein the mass concentration of polyacrylonitrile in the spinning solution is 10wt%, and the mass concentration of graphene in the spinning solution is 1wt%; preparing a spinning solution of the intermediate layer fiber by the same method, wherein the mass concentration of polyacrylonitrile in the spinning solution is 30wt%, and the mass concentration of graphene is 1.5wt%;
step 2, spinning the spinning solution obtained in the step 1 by adopting a coaxial electrostatic spinning technology, wherein the spun fiber is received in a square deionized water coagulation bath pool, when the upper surface layer fiber and the lower surface layer fiber are spun, the perfusion speed of the shell layer polymer solution of a coaxial spinning nozzle is 2mL/h, the voltage is 35kV, the distance between the spinning nozzle and the receiving liquid level is 15cm, the environmental temperature is 25 ℃, the environmental humidity is 40%, and the flow velocity of the core layer air of the coaxial spinning nozzle is 5m/s; when the middle layer fiber is spun, the perfusion speed of the shell polymer solution of the coaxial spinneret orifice is 3mL/h, the voltage is 20kV, the distance between the spinneret orifice and the receiving liquid level is 27cm, the environmental temperature is 25 ℃, the environmental humidity is 65 percent, and the flow speed of the core layer air of the coaxial spinneret orifice is 15m/s; the temperature of the wet air of the nuclear layer is 35 ℃ and the humidity is 85 percent;
and 3, carrying out spunlace treatment on the hollow micro-nanofiber aggregate with the laminated structure obtained in the step 2, and then drying in a blast oven to prepare the hollow micro-nanofiber nonwoven material with the laminated structure. The average diameter of the hollow nano-fiber in the lower surface layer of the laminated non-woven material is about 390nm, the hollowness is about 26 percent, the thickness of the fiber layer is 1.5mm, and the bulk density is 14mg/cm 3 (ii) a The diameter of the hollow micron fiber in the middle layer is about 1.9 μm, the hollowness is about 59%, the thickness of the fiber layer is 20mm, and the bulk density is 5.3mg/cm 3 (ii) a The prepared hollow micro-nanofiber non-woven material with the laminated structure has a thermal conductivity coefficient of 0.0261W/(m.K).
Example 3: a preparation method of a hollow micro-nanofiber non-woven material with a laminated structure comprises the following steps:
step 1, weighing polyacrylonitrile powder, dispersing the polyacrylonitrile powder in N, N-dimethylformamide, stirring the mixture at room temperature until the polyacrylonitrile powder is completely dissolved, then adding carbon nanotubes into the solution, and uniformly dispersing the carbon nanotubes in the solution by ultrasonic waves to obtain spinning solutions of upper and lower surface layer fibers, wherein the mass concentration of polyacrylonitrile in the spinning solution is 13wt%, and the mass concentration of tourmaline powder is 1wt%; preparing a spinning solution of the middle layer fiber by the same method, wherein the mass concentration of polyacrylonitrile in the spinning solution is 25wt%, and the mass concentration of tourmaline powder is 2wt%;
step 2, spinning the spinning solution obtained in the step 1 by adopting a coaxial electrostatic spinning technology, wherein the spun fiber is received in a square deionized water coagulation bath pool, when the upper surface layer fiber and the lower surface layer fiber are spun, the perfusion speed of the shell layer polymer solution of a coaxial spinning nozzle is 2mL/h, the voltage is 35kV, the distance between the spinning nozzle and the receiving liquid level is 17cm, the environmental temperature is 25 ℃, the environmental humidity is 40%, and the flow velocity of the core layer air of the coaxial spinning nozzle is 4m/s; when the middle layer fiber is spun, the perfusion speed of the shell polymer solution of the coaxial spinneret orifice is 3mL/h, the voltage is 25kV, the distance between the spinneret orifice and the receiving liquid level is 25cm, the ambient temperature is 25 ℃, the ambient humidity is 65 percent, and the flow velocity of the core layer gas air of the coaxial spinneret orifice is 16m/s; the temperature and the humidity of the core layer wet air are both 30 ℃ and 80 percent;
and 3, carrying out spunlace treatment on the hollow micro-nanofiber aggregate with the laminated structure obtained in the step 2, and then drying in a forced air oven to prepare the hollow micro-nanofiber non-woven material with the laminated structure. The average diameter of the fibers of the upper and lower surface layers of the laminated nonwoven material was about 700nm, the degree of hollowness was about 32%, the thickness of the fiber layer was 1mm, and the bulk density was 10.5mg/cm 3 (ii) a The diameter of the hollow micron fiber in the middle layer is about 2.3 μm, the hollowness is about 53 percent, the thickness of the fiber layer is 15mm, and the bulk density is 7.5mg/cm 3 (ii) a The prepared hollow micro-nanofiber non-woven material with the laminated structure has the thermal conductivity coefficient of 0.0281W/(m.K).
The above examples are only for further illustrating the specific embodiments of the present invention, but the present invention is not limited to the above examples, and all equivalent changes and modifications made to the above examples according to the technical spirit of the present invention are included in the scope of the technical solution of the present invention.

Claims (8)

1. The utility model provides a hollow micro-nanofiber non-woven material of laminated structure which characterized in that, includes upper epidermis, lower top layer and locates the intermediate level between upper epidermis and the lower top layer, upper epidermis and lower top layer are the fibre and pile up inseparable hollow nanofiber layer, the intermediate level is the fibre and piles up fluffy hollow microfiber layer, and the thickness of intermediate level is greater than the thickness on upper epidermis and lower top layer.
2. The hollow micro-nanofiber non-woven material with the laminated structure according to claim 1, wherein in the upper surface layer and the lower surface layer, the fiber diameter is 0.2-1 μm, the hollowness is 20-40%, the thickness of the fiber layer is 0.5-2 mm, and the fiber bulk density is 10-15 mg/cm 3 (ii) a In the intermediate layer, the fiber diameter is 1-3 μm, the hollowness is 50-80%, the fiber layer thickness is 10-25 mm, and the fiber bulk density is 3-8 mg/cm 3
3. The laminated structure hollow micro-nanofiber nonwoven material as claimed in claim 2, wherein the thermal conductivity of the laminated structure hollow micro-nanofiber nonwoven material is 0.025-0.029W/(m-K).
4. The preparation method of the hollow micro-nanofiber non-woven material with the laminated structure according to claim 1, characterized by comprising the following steps:
step 1, dissolving polyacrylonitrile powder in a solvent, then adding far infrared nano particles and uniformly dispersing to obtain a polyacrylonitrile/far infrared nano particle mixed solution;
step 2, taking the polyacrylonitrile/far infrared nanoparticle mixed solution as a shell layer, taking temperature-controllable wet air as a core layer, spinning by using a coaxial electrostatic spinning method, receiving spun fibers by using a liquid solidification tank, and preparing a laminated structure micro-nano fiber aggregate with different fiber diameters and hollowness by regulating and controlling the properties of the spinning solution and spinning process parameters in a gradient manner;
and 3, carrying out spunlace reinforcement on the micro-nano fiber aggregate with the laminated structure obtained in the step 2, and then carrying out air blowing and drying to prepare the hollow micro-nano fiber non-woven material with the laminated structure.
5. The method for preparing the hollow micro-nanofiber non-woven material with the laminated structure according to claim 4, wherein in the step 1, the solvent is one or a mixture of N, N-dimethylformamide, dimethyl sulfoxide and sulfolane; the far infrared nano-particles are one or more of carbon nano-tubes, graphene, tourmaline powder and ceramic nano-particles;
in the polyacrylonitrile/far infrared nano-particle mixed solution, the mass concentration of polyacrylonitrile is 5-35 wt%, and the mass concentration of far infrared nano-particles is 0.1-5 wt%.
6. The method for preparing the hollow micro-nanofiber non-woven material with the laminated structure according to claim 4, wherein in the step 2, coaxial spinneret orifices for coaxial electrostatic spinning are arranged in an array manner, a shell layer of the coaxial spinneret orifices is filled with the polyacrylonitrile/far infrared nanoparticle mixed solution obtained in the step 1, and a medium filled in a core layer of the coaxial spinneret orifices is temperature-controllable wet air;
the temperature of the temperature-controllable wet air is 30-40 ℃, and the humidity is 80-95%;
the liquid contained in the solidification tank is deionized water;
the hollow micro-nanofibers in the fiber aggregate have continuity.
7. The method for preparing the hollow micro-nanofiber non-woven material with the laminated structure according to claim 4, wherein in the step 2, the perfusion speed of the polymer solution of the shell layer of the coaxial spinneret is 1-10 mL/h, the flow rate of the wet air of the core layer is 1-20 m/s, the voltage is 10-50 kV, the distance between the spinneret and the liquid surface of the liquid coagulation tank is 10-50 cm, the ambient temperature is 15-30 ℃, and the ambient humidity is 30-70%.
8. The application of the laminated structure hollow micro-nanofiber non-woven material in the field of cold protection and warm keeping.
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