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A kind of flexible structural color textile based on cellulose nanocrystal and its preparation method

A flexible structure and textile technology, applied in textiles and papermaking, plant fibers, animal fibers, etc., can solve problems such as widening range, fragile cellulose nanocrystalline films, and inability to form flexible coatings, and achieve enhanced force, The effect of improving stability and firmness

Active Publication Date: 2022-03-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It has been reported that cellulose nanocrystals are assembled on nylon textiles by evaporation, and the structure of the fabric makes photonic crystals assemble at a periodic angle around the monofilament, resulting in broadband reflection (Tessellation of Chiral-NematicCellulose Nanocrystal Films by Microtemplating, Adv. Funct .Mater.2019,29,1808518), according to the Bragg equation λ=nPsinθ(λ: forbidden band reflection wavelength; n: refractive index of the film; P: helical pitch, which is also 2 times the layer spacing; θ: incident light The angle between the propagation direction and the vertical direction of the helix axis) When n and P are constant, the helix is ​​assembled into a concentric semi-ring layer around the cylindrical monofilament, and the value of θ changes periodically, which in turn makes the reflection λ range wider, resulting in broadband reflection
The cellulose nanocrystalline film formed by the hydrogen bonding force of the surface hydroxyl group is rigid and fragile, and cannot form a flexible coating on textiles
Moreover, the high surface energy prevents the cellulose nanocrystalline film from being perfectly attached to the fabric surface directly through the action of gravity.

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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  • A kind of flexible structural color textile based on cellulose nanocrystal and its preparation method
  • A kind of flexible structural color textile based on cellulose nanocrystal and its preparation method
  • A kind of flexible structural color textile based on cellulose nanocrystal and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing colored cotton fabric with flexible structure, comprising the steps of:

[0053] (1) adding 10 g of microcrystalline cellulose extracted from pine needle wood to a concentration of 86 mL of 64 wt % sulfuric acid solution, acidolysis at 45° C. for 30 min; Washing with deionized water, dialysis (the parameter of the dialysis bag is that the molecular weight cut-off is 8000-14000), concentration so that the concentration is 2wt%, to obtain the cellulose nanocrystal solution after acid hydrolysis;

[0054] (2) Cotton fabric ( image 3 Shown in (a)) (warp density: 472 threads / 10cm; weft density: 328 threads / 10cm; yarn fineness: 80S / 2; total tightness: 82.7%) the polytetrafluoroethylene placed in the sand core funnel filter membrane (average pore diameter is 1 μ m) surface, then pour 5 mL of the cellulose nanocrystal solution after the acid hydrolysis that step (1) obtains into the sand core funnel and carry out suction filtration, and the vacuum degre...

Embodiment 2

[0063] Adjust the cotton fabric in Example 1 to be a real silk fabric, and the specific parameters are: real silk fabric, warp density: 500 threads / 10cm; weft density: 390 threads / 10cm; yarn fineness: 24 / 26D; total tightness: 85% Others are consistent with embodiment 1, obtain flexible structural color real silk fabric.

[0064] Figure 5 It is the spectral data tested under the reflection mode of the UV-visible spectrometer for the flexible structured color silk fabric textile in embodiment 2; Wherein (1), (2), (3) is the flexible structured colored silk fabric textile of cellulose nanocrystal self-assembly The UV reflectance data of the cellulose nanocrystal layer measured by adding different proportions of glucose solutions: (1) cellulose nanocrystal / glucose=2:1, the maximum reflection wavelength is 423nm; (2) cellulose nanocrystal / glucose= 1:1, the maximum reflection wavelength is 496nm; (3) cellulose nanocrystal / glucose=1:2, the maximum reflection wavelength is 592nm. F...

Embodiment 3

[0067] The flexible modifier glucose in Example 1 was adjusted to be glycerol, and the others were kept the same as in Example 1 to obtain a colored cotton fabric with a flexible structure.

[0068] Figure 7Be the light intensity of the different reflection angles measured by the incident angle (referring to the included angle of light and sample horizontal direction) of 30 ° under the reflective mode of optical measuring instrument for flexible structural color cotton fabric textile in embodiment 3, (a) It is the curve of reflected light intensity changing with angle; (b) is the polar coordinate diagram of reflected light intensity, the upper semicircle is the polar coordinate diagram of 0-60% reflected light intensity, and the lower semicircle is the polar coordinate diagram of 0-18% reflected light intensity , is to show the data of (4) clearly; Among them (1), (2), (3) are the fibers measured by adding different proportions of glycerol solutions to the flexible structural...

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Abstract

The invention discloses a flexible structured colored textile based on cellulose nanocrystals and a preparation method thereof, belonging to the field of textiles. The method for preparing flexible structural colored textiles according to the present invention comprises the following steps: (1) placing the fabric on the surface of the polytetrafluoroethylene filter membrane of the sand core funnel, then pouring the cellulose nanocrystal solution after acidolysis into the sand The core funnel carries out suction filtration, obtains the fabric that the cellulose nanocrystal self-assembles on the surface after the acid hydrolysis; (2) the fabric obtained in step (1) is placed in the cross-linking agent solution and soaked, dried to obtain the cross-linked fabric (3) the fabric obtained in step (2) is placed in the softening modifier solution, soaked, and dried to obtain the flexible structural color textile. The method of the invention can be adjusted according to any required color; the flexible structural color textiles of the invention can be used in the fields of decoration, packaging, clothing, anti-counterfeiting and artwork.

Description

technical field [0001] The invention relates to a flexible structural colored textile based on cellulose nanocrystals and a preparation method thereof, belonging to the field of textiles. Background technique [0002] Traditional textile printing and dyeing is a labor-intensive and water-pollution industry, which does not conform to the concept of ecological development. In recent years, some traditional textile printing and dyeing enterprises in my country that do not meet the production standards have gradually transferred to South Asian countries or carried out industrial upgrading. The discharge of chemical dye wastewater has caused harm to the environment, and it is of great significance to develop non-toxic and harmless colorants. Compared with chemical dyes, cellulose nanocrystals that can produce structural colors through self-assembly have the characteristics of wide sources and environmental friendliness. The mechanism of dyes and pigments to produce color is the...

Claims

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/05D06M13/123D06M13/148D06M101/06D06M101/10
CPCD06M15/05D06M13/123D06M13/148D06M2101/06D06M2101/10D06M2200/50
Inventor 侯秀良张宇马博谋徐荷澜
Owner JIANGNAN UNIV