Nanofiber flocculus with sandwich structure and preparation method of nanofiber flocculus

A technology of nanofibers and composite nanofibers, which is applied in fiber processing, textiles, papermaking, non-woven fabrics, etc. It can solve the problems of poor compression resilience, easy peeling and insufficient heat retention, and achieve the effect of avoiding flying flocs

Active Publication Date: 2020-08-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a nanofiber floc with a sandwich structure and a preparation method thereof, aiming to solve the problems of poor compression resilience, easy peeling and insufficient warmth retention in the prior art when nanofibers are used in the field of cold protection and heat preservation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing nanofiber flakes with a sandwich structure, which is prepared by one-step electrospinning technology, and the specific steps are as follows:

[0036] (1) dissolving polystyrene into ethyl acetate first, then adding a difunctional aziridine crosslinking agent, stirring on a magnetic stirrer for 8h to obtain a spinning solution; wherein, the concentration of polystyrene in the spinning solution is 40wt %, the concentration of the difunctional aziridine crosslinking agent is 2.5wt%; the stirring speed is 60rpm, and the stirring temperature is 25°C;

[0037] (2) The spinning solution is placed in the syringe, the spinning power supply is connected, the relative humidity of the surrounding environment of the fiber flight line is 30% and the bottom layer is formed by spinning, and then the relative humidity is adjusted to 95% to spin to form the middle layer, Finally, adjust the relative humidity to 30% to form the upper layer by spinning to obtain a co...

Embodiment 2

[0042] A method for preparing nanofiber flakes with a sandwich structure, which is prepared by one-step electrospinning technology, and the specific steps are as follows:

[0043] (1) Dissolve the polyurethane into N,N-dimethylacetamide first, then add a difunctional aziridine crosslinking agent, and stir on a magnetic stirrer for 10 hours to obtain a spinning solution; wherein, the concentration of polyurethane in the spinning solution 20wt%, the concentration of the difunctional aziridine crosslinking agent is 1.3wt%; the stirring speed is 50rpm, and the stirring temperature is 23°C;

[0044] (2) The spinning solution is placed in the syringe, the spinning power supply is connected, the relative humidity of the surrounding environment of the fiber flight line is 10% and the bottom layer is formed by spinning, and then the relative humidity is adjusted to 81% and the spinning is formed to form the middle layer, Finally, adjust the relative humidity to 20% to form the upper la...

Embodiment 3

[0049] A method for preparing nanofiber flakes with a sandwich structure, which is prepared by one-step electrospinning technology, and the specific steps are as follows:

[0050] (1) Dissolve polyacrylonitrile into dimethyl sulfoxide first, then add a trifunctional aziridine crosslinking agent, and stir on a magnetic stirrer for 12 hours to obtain a spinning solution; wherein, the concentration of polyacrylonitrile in the spinning solution 40wt%, the concentration of the trifunctional aziridine crosslinking agent is 2.2wt%; the stirring speed is 70rpm, and the stirring temperature is 25°C;

[0051] (2) The spinning solution is placed in the syringe, the spinning power supply is switched on, the relative humidity of the surrounding environment of the fiber flight line is 29% and the bottom layer is formed by spinning, and then the relative humidity is adjusted to 92% and the spinning is formed to form the middle layer, Finally, adjust the relative humidity to 30% to form the u...

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Abstract

The invention relates to a nanofiber flocculus with a sandwich structure. The nanofiber flocculus is provided with a bottom layer, a middle layer and an upper layer with the longitudinal volume density being changed, the bottom layer and the upper layer are compact fiber layers, and the middle layer is a fluffy fiber layer; fibers, making contact with each other, in the nanofiber flocculus are crosslinked; the volume density of the compact fiber layers is 30-40 mg/cm3; the volume density of the fluffy fiber layer is 5-20 mg/cm3; and the compression resilience ratio of the nanofiber flocculus reaches 90% or above, and the CLO value is 2-4 clo. The nanofiber flocculus is prepared through an electrospinning technique, a polymer and a cross-linking agent are dissolved and dispersed in a solvent firstly, and sufficient stirring is conducted to obtain a spinning solution; and then continuous electrospinning is conducted under a specific humidity condition to obtain a composite nanofiber layer with the longitudinal volume density being changed, the composite nanofiber layer is subjected to crosslinking heat treatment, and the nanofiber flocculus is obtained.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a nanofiber flake with a sandwich structure and a preparation method thereof. Background technique [0002] Due to their fluffy three-dimensional structure and porous structure, the existing natural fiber thermal insulation wadding and synthetic fiber thermal insulation wadding can store a certain amount of still air and have thermal insulation performance. However, due to the large aperture of this type of fiber warm-keeping flakes, it is easy to cause air flow to cause heat loss, which reduces the heat-retaining performance of the fiber flakes. At the same time, the further improvement of the thermal performance of this type of fiber batt is mainly through increasing the thickness and weight, which brings the problems of bulkiness and inconvenient movement to the wearer. Electrospun nanofibers have the advantages of fine diameter, small pore size, high porosity, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/559D01D5/00
CPCD01D5/003D01D5/0061D01D5/0092D04H1/559D04H1/728
Inventor 丁彬王赛吴红炎曹雷涛田昱城赵磊郑作保斯阳印霞刘一涛俞建勇
Owner DONGHUA UNIV
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