CN113389050B - Flexible structure color textile based on cellulose nanocrystals and preparation method thereof - Google Patents
Flexible structure color textile based on cellulose nanocrystals and preparation method thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
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- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/12—Aldehydes; Ketones
- D06M13/123—Polyaldehydes; Polyketones
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- D06M13/144—Alcohols; Metal alcoholates
- D06M13/148—Polyalcohols, e.g. glycerol or glucose
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- D06M2101/02—Natural fibres, other than mineral fibres
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a flexible structure color textile based on cellulose nanocrystals and a preparation method thereof, belonging to the field of textiles. The method for preparing the textile with the flexible structure color comprises the following steps: (1) placing the fabric on the surface of a polytetrafluoroethylene filter membrane of a sand core funnel, pouring the cellulose nanocrystalline solution after acidolysis into the sand core funnel for suction filtration to obtain the fabric with the cellulose nanocrystalline self-assembled on the surface after acidolysis; (2) dipping the fabric obtained in the step (1) in a cross-linking agent solution, and drying to obtain a cross-linked fabric; (3) and (3) soaking the fabric obtained in the step (2) in a soft modifier solution, and drying to obtain the flexible structure color textile. The method can be adjusted according to any required color; the textile with the flexible structure color can be used in the fields of decoration, packaging, clothing, anti-counterfeiting, artwork and the like.
Description
Technical Field
The invention relates to a flexible structure color textile based on cellulose nanocrystals and a preparation method thereof, belonging to the field of textiles.
Background
The traditional textile printing and dyeing is an industry with intensive labor and severe water resource pollution, and does not accord with the concept of ecological development. In recent years, some traditional textile printing and dyeing enterprises which do not meet the production standards in China gradually shift to south Asia countries or carry out industrial upgrading. The discharge of chemical dye waste water causes harm to the environment, and the development of nontoxic and harmless coloring matters has important significance. Compared with chemical dyes, the cellulose nanocrystal capable of generating structural color through self-assembly has the characteristics of wide source and environmental friendliness. The mechanism by which dyes and pigments produce color is the mechanism of electron transition, while structural color is a color of optical interaction between natural light and microstructures and widely exists in nature, most of which involve nanoscale periodic photonic crystal structures or thin film interference mechanisms. In recent years, structural color materials have been intensively developed and studied because they have high resolution, good stability, high glossiness, iridescence, and the like, as compared with colors produced by dyes and pigments. If the structural color material is combined with the textile, the ecological textile with high added value can be obtained.
Cellulose is the largest organic resource on earth, mainly exists as a skeleton substance of cell walls, and is a cheap renewable resource. 1949
The first report reports the stable colloidal suspension of cellulose nanocrystals obtained by controlled sulfuric acid catalyzed degradation of lignocellulose. Marchelsault research in 1956 shows that semi-rigid cellulose nanocrystals and derivatives thereof obtained by using sulfuric acid as a hydrolytic agent can form a liquid crystal state, and chemically react with hydroxyl on the surface of the cellulose nanocrystals to generate negatively charged sulfonic acid groups, and then the formed negatively charged cellulose nanocrystals promote the particles to form completely uniform dispersion in water through electrostatic repulsion. The continuous reduction of the aqueous phase will cause the cellulose nanocrystals to spontaneously assemble, forming a nano-liquid crystal structure to most likely reduce the electrostatic interactions present between the cellulose nanocrystals. The cellulose nanocrystalline suspension can be subjected to self-assembly under the induction of evaporation to form an ordered chiral nematic structure film which is expressed as a one-dimensional photonic crystal, and visible light is selectively reflected under periodic light diffraction to form a structural color which can be observed by naked eyes.
Studies have reported that Cellulose nanocrystals are assembled on nylon textiles by evaporation, the structure of the fabric is such that the photonic crystals are assembled around the monofilaments at periodic angles resulting in broadband reflection (adv. funct. mater.2019,29,1808518), and when n and P are unchanged, the pitches are assembled around cylindrical monofilaments as concentric semi-ring layers, the value of θ changes periodically, thus widening the reflection λ range resulting in broadband reflection, according to the Bragg equation λ nPsin θ (λ: forbidden reflection wavelength; n: refractive index of the film; P: helical pitch, also 2 times the layer spacing; θ: angle between incident light propagation direction and perpendicular to the helical axis). The cellulose nanocrystalline film formed by hydrogen bond acting force formed by surface hydroxyl has strong rigidity and is fragile, and a flexible coating cannot be formed on textiles. Moreover, the high surface energy makes the cellulose nanocrystalline film unable to perfectly adhere to the surface of the fabric directly under the action of gravity.
Therefore, in order to fully exert the characteristic of environment-friendly and renewable cellulose nanocrystalline, the cellulose nanocrystalline photon film is attached to the textile, and the textile is still blank for research on rich and colorful structural color.
Disclosure of Invention
[ problem ] to
At present, cellulose nanocrystals are assembled on a nylon textile through evaporation, and a formed film is strong in rigidity, fragile and easy to fall off, so that a flexible coating cannot be formed.
[ solution ]
In order to solve the problems, the invention obtains the structural color textile by filtering the cellulose nanocrystalline chiral nematic phase layer on the textile substrate. In addition, in the suction filtration process, the pressure can enable the cellulose nanocrystalline layer to be tightly attached to the textile, and then the preparation of the textile with the flexible structure color is realized through the combination of the effects of the crosslinking agent and the softening agent.
A first object of the present invention is to provide a method for preparing a flexible structural color textile, comprising the steps of:
(1) placing the fabric on the surface of a polytetrafluoroethylene filter membrane of a sand core funnel, pouring the cellulose nanocrystalline solution after acidolysis into the sand core funnel for suction filtration to obtain the fabric with the cellulose nanocrystalline self-assembled on the surface after acidolysis;
(2) dipping the fabric obtained in the step (1) in a cross-linking agent solution, and drying to obtain a cross-linked fabric;
(3) and (3) soaking the fabric obtained in the step (2) in a soft modifier solution, and drying to obtain the flexible structure color textile.
In one embodiment of the invention, the fabric in step (1) comprises cotton fabric and silk fabric; the yarn fineness of the cotton fabric is 70-80S/2; the tightness is 75-85%; the yarn fineness of the real silk fabric is 20/22-24/26D; the tightness is 80-87%.
In one embodiment of the present invention, the average pore diameter of the polytetrafluoroethylene filter membrane in step (1) is 0.5 to 1 μm to ensure that the cellulose nanocrystals do not pass through the filter membrane.
In one embodiment of the present invention, the concentration of the cellulose nanocrystal solution after acid hydrolysis in step (1) is 1 to 4 wt%.
In one embodiment of the present invention, the method for preparing the cellulose nanocrystal solution after acid hydrolysis in step (1) comprises:
adding microcrystalline cellulose into a sulfuric acid solution with the concentration of 60-70 wt%, and carrying out acidolysis at 42-55 ℃ for 25-100 min; diluting, centrifuging, washing, dialyzing and concentrating after the acidolysis is finished to obtain the cellulose nanocrystalline solution after acidolysis; wherein the microcrystalline cellulose comprises microcrystalline cellulose extracted from pine needles, and the proportion of the microcrystalline cellulose to the sulfuric acid solution is 10 g: 86 mL.
In one embodiment of the invention, 10-25 mg of cellulose nanocrystals are obtained by suction filtration self-assembly on each square centimeter of the fabric in the step (1).
In one embodiment of the invention, the vacuum degree of the suction filtration in the step (1) is 0.03-0.05 MPa, namely, a reduced pressure suction filtration method is adopted to assist the self-assembly of the cellulose nanocrystals to realize better fabric lamination, so that the problem that the cellulose nanocrystals cannot be assembled in the fabric gaps (namely, the fabric cannot be well laminated) due to large surface energy and small capillary action is solved.
In one embodiment of the present invention, the thickness of the cellulose nanocrystal self-assembly in step (1) is 50 to 100 μm.
In one embodiment of the present invention, the crosslinking agent solution in step (2) is glutaraldehyde solution with a concentration of 5wt% to 8 wt%.
In one embodiment of the invention, the amount of the crosslinking agent solution in the step (2) is 20 to 100 μ L/cm2A fabric.
In one embodiment of the present invention, the drying in step (2) is drying at 60 ℃ for 40 min.
In one embodiment of the present invention, the softening modifier solution in step (3) is a glucose solution or a glycerol solution, and the concentration is 5 to 15 wt%.
In one embodiment of the present invention, the mass ratio of the soft modifier to the cellulose nanocrystals on the fabric in the soft modifier solution in the step (3) is 0.5 to 2: 1.
in one embodiment of the present invention, the drying in step (3) is drying at 60 ℃ for 60 min.
The second purpose of the invention is the flexible structure color textile prepared by the method of the invention.
The third purpose of the invention is the application of the textile with flexible structure color in the fields of decoration, packaging, clothing, anti-counterfeiting and artworks.
The fourth purpose of the invention is to provide a method for preparing a color-controllable flexible structure color textile, which is to realize the preparation of flexible structure color textiles with different colors by adjusting the proportion of cellulose nanocrystals and a soft modifier on the basis of the method for preparing the flexible structure color textile.
In one embodiment of the present invention, when the mass ratio of the cellulose nanocrystals to the softness modifier is 1: 1, the textile with the flexible structure color is blue-green; when the mass ratio of the cellulose nanocrystal to the soft modifier is 2: 1, the textile with the flexible structure color is blue-purple; when the mass ratio of the cellulose nanocrystal to the soft modifier is 1: at 2, the soft construction color textile is yellow-orange.
[ advantageous effects ]
(1) The method of the invention can be adjusted according to any required color.
(2) According to the invention, a glutaraldehyde solution is used as a cross-linking agent, and chemical cross-linking is carried out between the cellulose nanocrystalline structure color layer and the textile substrate, so that the effect of fixing the cellulose nanocrystalline structure color layer and the textile substrate is achieved, the acting force between the cellulose nanocrystalline structure color layer and the textile substrate is enhanced, and the stability and firmness of the photonic crystal color-generating structure layer are remarkably improved.
(3) The textile with the flexible structure color can be used in the fields of decoration, packaging, clothing, anti-counterfeiting, artwork and the like.
Drawings
FIG. 1 is a schematic diagram of suction filtration in a method for preparing a flexible structure yarn dyed fabric according to the invention; wherein (1) is a polytetrafluoroethylene filter membrane; (2) is a fabric; (3) a cellulose nanocrystal layer.
FIG. 2 is a flexible structure colored cotton fabric of example 1; wherein, the (a), (b) and (c) are physical photos of the cellulose nanocrystalline self-assembled flexible structure colored cotton fabric added with glucose solutions with different proportions; (a) cellulose nanocrystal/glucose 2: 1, bluish violet; (b) cellulose nanocrystal/glucose ═ 1: 1, cyan; (c) cellulose nanocrystal/glucose ═ 1: 2, yellow orange; (d) is a flexible and bendable photo of a physical object showing (c); (e) is a physical photograph showing the degree of bendability of (c); (f) is a photograph of the cotton fabric of comparative example 1 to which no flexibility modifier was added, which was broken during the bending test due to the brittleness of the structural color layer.
FIG. 3 is an optical microscope photograph of the cotton fabric selected in example 1 and the real silk fabric selected in example 2; wherein (a) is cotton fabric, warp density: 472 roots/10 cm; weft density: 328 roots/10 cm; yarn fineness: 80S/2; total tightness: 82.7 percent; (b) is a real silk fabric, with warp density: 500 roots/10 cm; weft density: 390 roots/10 cm; yarn fineness: 24/26D; total tightness: 85 percent.
FIG. 4 is a scanning electron microscope image of a cellulose nanocrystalline structure color layer of a flexible structure colored cotton fabric in example 1; wherein (a) is a surface topography image; (b) is a macroscopic image of the cross-sectional topography; (c) is a high power image of the cross-sectional topography; (d) is the magnified image of (b).
FIG. 5 is the spectral data of the flexible structural color silk fabric textile tested in the reflection mode of the UV-visible spectrometer in example 2; wherein, the (1), (2) and (3) are the ultraviolet reflectivity data of the cellulose nanocrystalline layer measured by adding glucose solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile: (1) cellulose nanocrystal/glucose 2: 1, maximum reflection wavelength 423 nm; (2) cellulose nanocrystal/glucose ═ 1: 1, maximum reflection wavelength 496 nm; (3) cellulose nanocrystal/glucose ═ 1: 2, maximum reflection wavelength 592 nm.
FIG. 6 is the light intensity of the flexible structure color silk fabric textile of example 2 at different reflection angles measured with an incident angle of 30 ° (here, the angle between the light and the horizontal direction of the sample) in the reflection mode of the optical measurement instrument; wherein (1), (2) and (3) are reflected light intensity data of the cellulose nanocrystalline layer measured by adding glucose solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glucose is 2: 1; (2) cellulose nanocrystal/glucose ═ 1: 1; (3) cellulose nanocrystal/glucose ═ 1: 2; (4) is reflected light intensity data of a real silk fabric substrate; (5) is the reflected light intensity data of a real silk fabric substrate with luster.
FIG. 7 is the light intensity of the flexible structure colored cotton fabric textile of example 3 at different reflection angles measured at an incident angle of 30 ° (here, the angle between the light and the horizontal direction of the sample) in the reflection mode of the optical measurement instrument; wherein (1), (2) and (3) are reflected light intensity data of the cellulose nanocrystalline layer measured by adding glycerol solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glycerol is 2: 1; (2) cellulose nanocrystal/glycerol ═ 1: 1; (3) cellulose nanocrystal/glycerol ═ 1: 2; (4) is reflected light intensity data for a cotton fabric substrate.
FIG. 8 is the spectral data of the flexible structural color silk fabric textile tested in the reflection mode of the UV-visible spectrometer in example 4; wherein (1), (2) and (3) are ultraviolet reflectance data of the cellulose nanocrystalline layer measured by adding glycerol solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glycerol is 2: 1, maximum reflection wavelength 402 nm; (2) cellulose nanocrystal/glycerol ═ 1: 1, the maximum reflection wavelength is 489 nm; (3) cellulose nanocrystal/glycerol ═ 1: 2, maximum reflection wavelength 553 nm.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of better illustrating the invention and is not intended to limit the invention thereto. In the examples, water is used as a solvent, but the solvent is not described.
The test method comprises the following steps:
and (3) real object photo: photographs were taken directly above the samples with a Canon EOS 800D model single lens reflex camera.
Test method of optical microscope: in the non-polarization mode of a polarizing microscope of the Leica DM7200 model, an image is taken with a 5-fold objective lens and a 10-fold eyepiece.
The testing method of the scanning electron microscope comprises the following steps: the palladium spraying was performed under vacuum, and then the sample was observed under a voltage of 10kV by a cold field emission scanning electron microscope (Hitachi Regulus 8220).
The testing method of the reflectivity comprises the following steps: an ultraviolet-visible light spectrum analyzer (Shimadzu UV2600) adopts a solid reflection mode, air is used as a baseline for calibration, and then a cellulose nanocrystalline layer is placed on a reflection sample groove and is opposite to a light path for testing.
Method for testing gloss: the gloss measurement was carried out using a photorefractor (COLOR MURAKAMI COLOR GP-200 on village). Light intensity at different reflection angles measured in reflection mode with an angle of incidence of 30 deg., here the angle of light to the horizontal of the sample.
Example 1
A method of making a flexible structure colored cotton fabric comprising the steps of:
(1) adding microcrystalline cellulose extracted from 10g of pine needle wood into 86mL of 64 wt% sulfuric acid solution, and carrying out acidolysis at 45 ℃ for 30 min; diluting with deionized water after the acid hydrolysis, centrifuging (centrifuging at 3000rpm for 15min), washing with deionized water, dialyzing (the parameter of a dialysis bag is 8000-14000 molecular weight cut-off), and concentrating to obtain a cellulose nanocrystal solution after the acid hydrolysis, wherein the concentration of the cellulose nanocrystal solution is 2 wt%;
(2) placing cotton fabrics (shown in (a) in figure 3) (the warp density: 472 pieces/10 cm; the weft density: 328 pieces/10 cm; the yarn fineness: 80S/2; the total tightness: 82.7%) on the surface of a polytetrafluoroethylene filter membrane (the average pore diameter is 1 mu m) of a sand core funnel, pouring 5mL of the cellulose nanocrystalline solution after acid hydrolysis obtained in the step (1) into the sand core funnel for suction filtration, wherein the vacuum degree of the suction filtration is 0.03MPa, and obtaining the cellulose nanocrystalline self-assembled fabric after acid hydrolysis; wherein the self-assembled cellulose nanocrystalline on the surface of each square centimeter of cotton fabric is 0.1g, and the thickness is 50 μm;
(3) placing the cotton fabric obtained in the step (2) into a glutaraldehyde solution with the concentration of 5wt% for normal-temperature impregnation, and then drying at 60 ℃ for 40min to obtain a cross-linked cotton fabric; wherein the dosage of the glutaraldehyde solution is 50 mu L/cm2A fabric;
(4) soaking the cotton fabric obtained in the step (3) in a glucose solution with the concentration of 10 wt% at normal temperature, and drying at 60 ℃ for 60min to obtain the flexible structure colored cotton fabric; wherein the dosage of the glucose solution is 0.5g, 1g and 2g (absolute mass)/gram of cellulose nanocrystalline, namely the mass ratio of the glucose to the cellulose nanocrystalline is 1: 2. 1: 1 and 2: 1.
FIG. 2 is a graph of the test results of the flexible structure colored cotton fabric of example 1, wherein (a), (b), and (c) are photographs of the cellulose nanocrystal self-assembled flexible structure colored cotton fabric with glucose solutions of flexible modifiers added in different ratios; (a) cellulose nanocrystal/glucose 2: 1, bluish violet; (b) cellulose nanocrystal/glucose ═ 1: 1, cyan; (c) cellulose nanocrystal/glucose ═ 1: 2, yellow orange; (d) is a flexible and bendable photo of a physical object showing (c); (e) is a physical photograph showing the degree of bendability of (c); as can be seen from fig. 2: with the increase of the ratio of the glucose to the cellulose nanocrystals, the reflection wavelength of the obtained cotton fabric with structural color becomes red-shifted, so that the reflection wavelength can be adjusted at will by changing the addition amount of the glucose, and the cotton fabric with any structural color in the visible light range can be obtained. At the same time, the introduction of glucose leads the structural color cotton fabric to become soft and bendable, and the maximum curvature K of the fabric is measured to be 0.667mm-1(by measuring the radius r of the minimum circle of curvature to be 1.5mm, the maximum curvature K to be 1/r according to the curvature formula K, 0.667mm-1)。
FIG. 4 is a scanning electron microscope image of a cellulose nanocrystalline structure color layer of a flexible structure colored cotton fabric in example 1; wherein (a) is a surface topography image; (b) is a macroscopic image of the cross-sectional topography; (c) is a high power image of the cross-sectional topography; (d) is the magnified image of (b). As can be seen from fig. 4 (a): the cellulose nanocrystalline layer is tightly attached to the cotton fabric; as can be seen from fig. 4 (b) and (d): the protrusion (outline marked by solid line) of the cellulose nanocrystalline layer on the cross section due to the seam tightly attached to the fabric, and (d) the indication that the helical arrangement of the cellulose nanocrystalline generates helical shaft distortion at different angles; as can be seen from (c) of fig. 4: a lamellar chiral nematic structure of cellulose nanocrystals.
Comparative example 1
The addition of glucose was omitted from example 1 and otherwise identical to example 1, resulting in a structurally colored cotton fabric.
Through testing, it can be seen that: when the flexibility modifier is not added, the structural color layer of the structural color cotton fabric is broken due to high brittleness in the bending test process, and the structural color layer is shown in (f) in fig. 2.
Example 2
The cotton fabric in the embodiment 1 is adjusted to be real silk fabric, and the specific parameters are as follows: real silk fabric, warp density: 500 roots/10 cm; weft density: 390 roots/10 cm; yarn fineness: 24/26D; total tightness: 85 percent; the rest is kept consistent with the example 1, and the silk fabric with the flexible structure color is obtained.
FIG. 5 is the spectral data of the flexible structural color silk fabric textile tested in the reflection mode of the UV-visible spectrometer in example 2; wherein, the (1), (2) and (3) are the ultraviolet reflectivity data of the cellulose nanocrystalline layer measured by adding glucose solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile: (1) cellulose nanocrystal/glucose 2: 1, maximum reflection wavelength 423 nm; (2) cellulose nanocrystal/glucose ═ 1: 1, maximum reflection wavelength 496 nm; (3) cellulose nanocrystal/glucose ═ 1: 2, maximum reflection wavelength 592 nm. As can be seen from fig. 5: the wavelength corresponding to the maximum reflection peak of the cellulose nanocrystal layer is red-shifted with the increase of the introduced amount of glucose.
Fig. 6 is the light intensity of the flexible structure color silk fabric textile of example 2 at different reflection angles measured with an incident angle of 30 ° (here, the included angle of light with the horizontal direction of the sample) in the reflection mode of the optical measuring instrument, a) is the curve of the reflected light intensity as a function of angle; b) the polar coordinate graph of the reflected light intensity is shown, the upper semicircle is the polar coordinate graph of 0-100% of the reflected light intensity, and the lower semicircle is the polar coordinate graph of 0-22% of the reflected light intensity, so as to clearly show the data of (4) and (5); wherein (1), (2) and (3) are reflected light intensity data of the cellulose nanocrystalline layer measured by adding glucose solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glucose is 2: 1; (2) cellulose nanocrystal/glucose ═ 1: 1; (3) cellulose nanocrystal/glucose ═ 1: 2; (4) is reflected light intensity data of a real silk fabric substrate; (5) is the reflected light intensity data of a real silk fabric substrate with luster. As can be seen from fig. 6: the reflection intensity of the cellulose nanocrystalline layer is 70% -95% and far better than the reflection intensity of 21% of real silk fabric, so that the glossiness of the cellulose nanocrystalline layer is better than that of the real silk fabric.
Example 3
The flexibility modifier glucose in example 1 was adjusted to be glycerol, and the balance was kept the same as in example 1, to obtain a flexible structure colored cotton fabric.
FIG. 7 is the light intensity at different reflection angles measured by the flexible structure colored cotton fabric textile in the reflection mode of the optical measurement instrument with an incident angle of 30 ° (here, the included angle between the light and the horizontal direction of the sample), (a) is the curve of the variation of the reflected light intensity with the angle; (b) the polar coordinate graph of the reflected light intensity is shown, the upper semicircle is the polar coordinate graph of 0-60% of the reflected light intensity, and the lower semicircle is the polar coordinate graph of 0-18% of the reflected light intensity, so as to clearly show the data in the step (4); wherein (1), (2) and (3) are reflected light intensity data of the cellulose nanocrystalline layer measured by adding glycerol solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glycerol is 2: 1; (2) cellulose nanocrystal/glycerol ═ 1: 1; (3) cellulose nanocrystal/glycerol ═ 1: 2; (4) is reflected light intensity data of a cotton substrate. As can be seen from fig. 7: the reflection intensity of the cellulose nanocrystalline layer is between 44% and 59% and is far better than the reflection intensity of a cotton fabric at 16%, so that the glossiness of the cellulose nanocrystalline layer is better than that of the cotton fabric.
Example 4
The flexible modifier in the embodiment 2 is adjusted to be glycerol, and the others are kept consistent with the embodiment 2, so that the silk fabric with the flexible structural color is obtained.
FIG. 8 is the spectral data of the flexible structural color silk fabric textile tested in the reflection mode of the UV-visible spectrometer in example 4; wherein (1), (2) and (3) are ultraviolet reflectance data of the cellulose nanocrystalline layer measured by adding glycerol solutions with different proportions to the cellulose nanocrystalline self-assembled flexible structure color silk fabric textile, and (1) the cellulose nanocrystalline/glycerol is 2: 1, maximum reflection wavelength 402 nm; (2) cellulose nanocrystal/glycerol ═ 1: 1, the maximum reflection wavelength is 489 nm; (3) cellulose nanocrystal/glycerol ═ 1: 2, maximum reflection wavelength 553 nm. As can be seen from fig. 8: the wavelength corresponding to the maximum reflection peak of the cellulose nanocrystalline layer is red-shifted with the increase of the introduced amount of glycerol.
Comparative example 2
The cotton fabric in the example 1 is replaced by terylene, chinlon and spandex fabric, and other conditions are the same as the example 1.
The test result shows that: the cross-linking agent glutaraldehyde solution can not cross-link the fabric and the cellulose nanocrystalline at all, and can fall off from the fabric after being bent for many times.
Comparative example 3
The addition amount of glucose as a flexibility modifier was adjusted to be less than half of the mass of the cellulose nanocrystal layer, and other conditions were the same as in example 1.
The test result shows that: the resulting cotton fabric had poor flexibility and failed to attain the maximum curvature K of 0.667mm as shown in fig. 2 (e)-1。
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of making a flexible, structure-colored textile, comprising the steps of:
(1) placing the fabric on the surface of a polytetrafluoroethylene filter membrane of a sand core funnel, pouring the cellulose nanocrystalline solution after acidolysis into the sand core funnel for suction filtration to obtain the fabric with the cellulose nanocrystalline self-assembled on the surface after acidolysis;
(2) dipping the fabric obtained in the step (1) in a cross-linking agent solution, and drying to obtain a cross-linked fabric;
(3) dipping the fabric obtained in the step (2) in a soft modifier solution, and drying to obtain the flexible structure color textile;
wherein the fabric is cotton fabric and real silk fabric;
the cross-linking agent solution is glutaraldehyde solution, and the concentration of the cross-linking agent solution is 5-8 wt%;
the soft modifier solution is a glucose solution or a glycerol solution, and the concentration of the soft modifier solution is 5-15 wt%.
2. The method according to claim 1, wherein the cotton fabric has a yarn fineness of 70-80S/2; the tightness is 75% -85%; the yarn fineness of the real silk fabric is 20/22-24/26D; the tightness is 80% -87%.
3. The method as claimed in claim 1 or 2, wherein the average pore size of the polytetrafluoroethylene filter membrane in step (1) is 0.5 to 1 μm.
4. The method according to claim 1 or 2, wherein the cellulose nanocrystals of step (1) are self-assembled to a thickness of 50 to 100 μm.
5. The method according to claim 1 or 2, wherein 10-25 mg of the cellulose nanocrystals obtained by suction filtration self-assembly are obtained on each square centimeter of the fabric in the step (1).
6. The method according to claim 1 or 2, wherein the vacuum degree of the suction filtration in the step (1) is 0.03-0.05 MPa.
7. The method according to claim 1 or 2, wherein the mass ratio of the soft modifier to the cellulose nanocrystals on the fabric in the soft modifier solution in the step (3) is 0.5-2: 1.
8. a flexible structure color textile prepared by the method of any one of claims 1 to 7.
9. Use of the flexible color structured textile of claim 8 in the fields of decoration, packaging, apparel, security, and art.
10. The method for preparing the color-controllable textile with the flexible structural color is characterized in that on the basis of the method for preparing the textile with the flexible structural color according to any one of claims 1 to 7, the textile with the flexible structural color with different colors is prepared by adjusting the proportion of the cellulose nanocrystals to the soft modifier; when the mass ratio of the cellulose nanocrystal to the soft modifier is 1: 1, the textile with the flexible structure color is blue-green; when the mass ratio of the cellulose nanocrystal to the soft modifier is 2: 1, the textile with the flexible structure color is blue-purple; when the mass ratio of the cellulose nanocrystal to the soft modifier is 1: at 2, the soft construction color textile is yellow-orange.
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