Humidity response structural yarn-dyed fabric and preparation method thereof

Abstract

The invention discloses a humidity response structural yarn-dyed fabric and a preparation method thereof, and belongs to the technical field of structural yarn-dyed textile preparation, and the preparation method comprises the following steps: step S1, carrying out alternate ultrasonic washing and drying on a spandex fabric with ethanol and deionized water, and then carrying out oxygen plasma treatment for 2 minutes under the condition of 200W to obtain a pretreated fabric; s2, adding the modified microsphere dispersion liquid into the hydrogel prepolymer liquid, performing ultrasonic dispersion, adding the pretreated fabric, performing dipping stirring for 5 minutes, taking out the pretreated fabric, performing ultraviolet curing on the surface of a 0.2 T magnet for 20-30 minutes, and performing washing and drying to obtain the humidity response structural yarn-dyed fabric, the hydrogel capable of absorbing moisture and swelling is introduced into the surface of the spandex fabric treated by the plasma, and the modified microspheres with good color development brightness are doped in the hydrogel, so that multicolor response with different humidity is realized along with suction and removal of liquid, and the structural yarn-dyed fabric is endowed with good humidity response performance.

Description

Technical Field

[0001] The invention belongs to the technical field of structural color textile preparation, and particularly relates to a humidity responsive structural color fabric and a preparation method thereof. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, structural color textiles have gradually become a hot spot for research and application. Responsive structural color fabrics can automatically adjust their own color changes according to changes in external conditions (such as temperature, humidity, light, etc.), thereby providing a safer and more convenient life experience.

[0003] The patent with application number 201910193770.5 discloses a solvent-induced photonic crystal fabric and its preparation and application. The preparation includes: P (St-BA-AA) colloidal microspheres with a core-shell structure are dispersed in water and ultrasonically mixed with a trace amount of acetylene carbon black, and then uniformly loaded on the surface of the fabric and dried. The polyester fabric assembled with P (St-BA-AA) core-shell microspheres presents its original black color. The structural color layer has good mechanical properties. When it encounters water or other solvents, the color can change by changing the refractive coefficient. The color of the fabric is different for different solvents. However, the color change method based on the change of the refractive coefficient can only achieve a monochromatic response of the solvent, and cannot achieve a multi-color response according to the amount of solvent. Therefore, how to achieve a multi-color response of the structural color fabric according to the amount of water or solvent is a technical problem that needs to be solved at present. Summary of the invention

[0004] The object of the present invention is to provide a humidity responsive structural color fabric and a preparation method thereof, so as to solve the problems in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a humidity responsive structural color fabric comprises the following steps:

[0007] Step S1: Pretreatment of textile fabrics

[0008] The spandex fabric was alternately ultrasonically washed with ethanol and deionized water, and after drying, it was treated with oxygen plasma at 200W for 2 minutes to obtain a pretreated fabric; the hydrophilicity of the surface of the pretreated fabric was improved by oxygen ion treatment;

[0009] Step S2: Preparation of structural color fabric

[0010] Add the modified microsphere dispersion to the hydrogel prepolymer solution, after ultrasonic dispersion, add the pretreated fabric, immerse and stir for 5 minutes, take out and perform UV curing on the surface of a 0.2T magnet for 20-30 minutes, then wash and dry to obtain a humidity-responsive structural color fabric;

[0011] The usage ratio of the hydrogel prepolymer solution, the modified microsphere dispersion solution and the pretreated fabric is 40 mL: 15 mL: 10-12 g.

[0012] Furthermore, the hydrogel prepolymer solution is prepared by the following steps:

[0013] Add acrylamide and acrylic acid to the alcohol solution, stir and mix, add N,N-methylenebisacrylamide, ultrasonically dissolve, then add 2-hydroxy-2-methylpropiophenone, mix evenly, and obtain a hydrogel prepolymer solution;

[0014] Wherein, acrylamide and acrylic acid are prepolymer monomers, N,N-methylenebisacrylamide is a crosslinking agent, and 2-hydroxy-2-methylpropiophenone is a photoinitiator.

[0015] Furthermore, the usage ratio of the alcohol solution, acrylamide, acrylic acid, N,N-methylenebisacrylamide and 2-hydroxy-2-methylpropiophenone is 60mL:18-20g:1-2mL:0.5-1.5g:0.5-1mL; the alcohol solution is composed of ethanol and ethylene glycol in a volume ratio of 1:1-2.

[0016] Furthermore, the modified microsphere dispersion is prepared by dispersing 6-8 g of modified microspheres in 20 mL of ethylene glycol.

[0017] Furthermore, the modified microspheres are prepared by the following steps:

[0018] A1. Add magnetic iron oxide to deionized water, stir and disperse, then add oleic acid at 80-90°C, stir and react for 1-1.5h, cool, filter, wash, dry, and then place in n-octane, stir and disperse to obtain a magnetic fluid;

[0019] A2, add styrene and hexadecane to the magnetic fluid, after ultrasonic dispersion, add an aqueous solution of sodium dodecylsulfonate dropwise while stirring, add potassium persulfate after the addition is complete, and continue to react at 70-80°C for 16-18h, and then filter, wash with deionized water, and dry to obtain modified microspheres;

[0020] The invention uses magnetic iron oxide with a high refractive index as a crystal unit, uses amphiphilic oleic acid as a surface modifier, and complexes with iron ions through carboxyl groups to obtain oleic acid-modified magnetic iron oxide, which is then dispersed in an n-octane solvent to obtain a magnetic fluid with good dispersibility and stability, thereby effectively avoiding the agglomeration of the magnetic iron oxide. Then, the magnetic fluid and styrene are used as an oil phase, a surfactant sodium dodecyl sulfate aqueous solution is used as a water phase, and hexadecane is used as a stabilizer. Under the action of an initiator potassium persulfate, styrene monomers are emulsion polymerized on the surface of the oleic acid-modified magnetic iron oxide to obtain modified microspheres with the magnetic iron oxide as a core and polystyrene as a shell.

[0021] Furthermore, the usage ratio of the deionized water, magnetic iron oxide, oleic acid and n-octane is 80 mL: 2-4 g: 0.5-2 mL: 50 mL.

[0022] Furthermore, the usage ratio of the magnetic fluid, styrene, hexadecane, aqueous solution of sodium dodecyl sulfate and potassium persulfate is 50mL:4-8g:1g:80mL:0.3g; the concentration of the aqueous solution of sodium dodecyl sulfate is 0.9-1.4wt%.

[0023] A humidity responsive structural color fabric is prepared by the above preparation method.

[0024] Beneficial effects of the present invention:

[0025] The invention uses acrylamide and acrylic acid as hydrogel prepolymer monomers, and acrylamide has good water absorption performance and large swelling volume change. Under the action of a crosslinking agent and a photoinitiator, a hydrogel doped with modified microspheres is obtained through a free radical polymerization reaction, and a magnetic field is introduced during the polymerization process to arrange the modified microspheres with magnetism into a one-dimensional chain photonic crystal structure. In addition, during the polymerization process, the hydrogel can form hydrogen bonds with hydrophilic groups such as hydroxyl groups and carboxyl groups on the surface of the pretreated fabric, and then a poly (acrylamide-acrylic acid) hydrogel coated with the modified microspheres is introduced on the surface of the pretreated fabric, thereby enhancing the interface bonding force between the hydrogel and the pretreated fabric. When the fabric meets water, the poly (acrylamide-acrylic acid) hydrogel on the surface of the fabric absorbs water and swells. As the volume of the hydrogel increases, the lattice spacing of the one-dimensional chain modified microsphere photonic crystal gradually increases, which is manifested from a macroscopic point of view as a gradual change in fabric color from blue to green and then to red. When water leaves the fabric, the color gradually changes from red back to a blue state, thereby achieving a multi-color response to humidity.

[0026] At the same time, the modified microspheres of the present invention with magnetic iron oxide as the core and polystyrene as the shell are structural color photonic crystals. The magnetic iron oxide has a good refractive index. Under the protection of the colorless and transparent polystyrene shell, it can not only absorb stray light and improve the saturation of the structural color, but also improve the intensity of the photonic crystal structural color layer.

[0027] The present invention introduces a hydrogel capable of absorbing moisture and swelling on the surface of a plasma-treated spandex fabric, and dopes modified microspheres with good color brightness inside the hydrogel. With the absorption and removal of liquid, multi-color responses with different humidity levels are achieved, giving the structural color fabric good humidity response performance. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment provides a modified microsphere, which is prepared by the following steps:

[0031] A1. Add 2g of magnetic iron oxide to 80mL of deionized water, stir and disperse, then add 0.5mL of oleic acid at 80℃, stir and react for 1h, cool, filter, wash, dry, then place in 50mL of n-octane, stir and disperse to obtain a magnetic fluid;

[0032] A2. Add 4 g of styrene and 1 g of hexadecane to 50 mL of magnetic fluid. After ultrasonic dispersion, add 80 mL of a 0.9 wt% aqueous solution of sodium dodecyl sulfate while stirring. After the addition is complete, add 0.3 g of potassium persulfate, and continue to react at 70 ° C for 16 hours. Then, filter, wash with deionized water, and dry to obtain modified microspheres.

[0033] Example 2

[0034] This embodiment provides a modified microsphere, which is prepared by the following steps:

[0035] A1. Add 3g of magnetic iron oxide to 80mL of deionized water, stir and disperse, then add 1mL of oleic acid at 85°C, stir and react for 1h, cool, filter, wash, dry, then place in 50mL of n-octane, stir and disperse to obtain a magnetic fluid;

[0036] A2. Add 6 g of styrene and 1 g of hexadecane to 50 mL of magnetic fluid. After ultrasonic dispersion, add 80 mL of a 1.1 wt% aqueous solution of sodium dodecyl sulfate while stirring. After the addition is complete, add 0.3 g of potassium persulfate, and continue to react at 75 ° C for 17 hours. Then, filter, wash with deionized water, and dry to obtain modified microspheres.

[0037] Example 3

[0038] This embodiment provides a modified microsphere, which is prepared by the following steps:

[0039] A1. Add 4 g of magnetic iron oxide to 80 mL of deionized water, stir and disperse, then add 2 mL of oleic acid at 90 ° C, stir and react for 1.5 hours, cool, filter, wash, dry, and then place in 50 mL of n-octane, stir and disperse to obtain a magnetic fluid;

[0040] A2. Add 8 g of styrene and 1 g of hexadecane to 50 mL of magnetic fluid. After ultrasonic dispersion, add 80 mL of a 1.4 wt% aqueous solution of sodium dodecyl sulfate while stirring. After the addition is complete, add 0.3 g of potassium persulfate, and continue to react at 80 ° C for 18 hours. Then, filter, wash with deionized water, and dry to obtain modified microspheres.

[0041] Comparative Example 1

[0042] Compared with Example 1, the difference is that styrene is replaced by methyl methacrylate in an equal amount, and the other raw materials and steps are the same.

[0043] Comparative Example 2

[0044] Compared with Example 1, the difference is that styrene is replaced by carbon black in an equal amount, and the other raw materials and steps are the same.

[0045] Example 4

[0046] This embodiment provides a hydrogel prepolymer solution, which is prepared by the following steps:

[0047] To 60 mL of an alcohol solution prepared by mixing ethanol and ethylene glycol in a volume ratio of 1:1, 18 g of acrylamide and 1 mL of acrylic acid were added and stirred to mix. 0.5 g of N,N-methylenebisacrylamide was added and dissolved by ultrasonication. Then, 0.5 mL of 2-hydroxy-2-methylpropiophenone was added and mixed evenly to obtain a hydrogel prepolymer solution.

[0048] Example 5

[0049] This embodiment provides a hydrogel prepolymer solution, which is prepared by the following steps:

[0050] To 60 mL of an alcohol solution prepared by mixing ethanol and ethylene glycol in a volume ratio of 1:1.5, 19 g of acrylamide and 1.5 mL of acrylic acid were added and stirred to mix. Then, 1 g of N,N-methylenebisacrylamide was added and dissolved by ultrasonication. Then, 0.8 mL of 2-hydroxy-2-methylpropiophenone was added and mixed evenly to obtain a hydrogel prepolymer solution.

[0051] Example 6

[0052] This embodiment provides a hydrogel prepolymer solution, which is prepared by the following steps:

[0053] To 60 mL of an alcohol solution prepared by mixing ethanol and ethylene glycol in a volume ratio of 1:2, 20 g of acrylamide and 2 mL of acrylic acid were added and stirred to mix. 1.5 g of N,N-methylenebisacrylamide was added and dissolved by ultrasonication. Then 1 mL of 2-hydroxy-2-methylpropiophenone was added and mixed evenly to obtain a hydrogel prepolymer solution.

[0054] Comparative Example 3

[0055] Compared with Example 4, the difference is that an equal amount of acrylamide is replaced by tetraethyl orthosilicate, and the other raw materials and steps are the same.

[0056] Example 7

[0057] This embodiment provides a method for preparing a humidity responsive structural color fabric, comprising the following steps:

[0058] Step S1, washing the spandex fabric with ethanol and deionized water alternately by ultrasonic washing, drying, and subjecting the fabric to oxygen plasma treatment at 200 W for 2 min to obtain a pretreated fabric;

[0059] Step S2, adding 6 g of the modified microspheres prepared in Example 1 into 20 mL of ethylene glycol, and dispersing by ultrasonication to obtain a modified microsphere dispersion;

[0060] Step S2: Preparation of structural color fabric

[0061] 15 mL of the modified microsphere dispersion was added to 40 mL of the hydrogel prepolymer obtained in Example 4. After ultrasonic dispersion, 10 g of the pretreated fabric was added and immersed and stirred for 5 min. After taking out, the fabric was UV-cured on the surface of a 0.2 T magnet for 20 min. After washing and drying, a humidity-responsive structural color fabric was obtained.

[0062] Example 8

[0063] This embodiment provides a method for preparing a humidity responsive structural color fabric, comprising the following steps:

[0064] Step S1, washing the spandex fabric with ethanol and deionized water alternately by ultrasonic washing, drying, and subjecting the fabric to oxygen plasma treatment at 200 W for 2 min to obtain a pretreated fabric;

[0065] Step S2, adding 7 g of the modified microspheres prepared in Example 2 to 20 mL of ethylene glycol, and dispersing by ultrasonication to obtain a modified microsphere dispersion;

[0066] Step S2: Preparation of structural color fabric

[0067] 15 mL of the modified microsphere dispersion was added to 40 mL of the hydrogel prepolymer obtained in Example 5. After ultrasonic dispersion, 11 g of the pretreated fabric was added and immersed and stirred for 5 min. After taking out, the fabric was UV-cured on the surface of a 0.2 T magnet for 25 min. After washing and drying, a humidity-responsive structural color fabric was obtained.

[0068] Example 9

[0069] This embodiment provides a method for preparing a humidity responsive structural color fabric, comprising the following steps:

[0070] Step S1, washing the spandex fabric with ethanol and deionized water alternately by ultrasonic washing, drying, and subjecting the fabric to oxygen plasma treatment at 200 W for 2 min to obtain a pretreated fabric;

[0071] Step S2, adding 8 g of the modified microspheres obtained in Example 3 to 20 mL of ethylene glycol, and dispersing by ultrasonication to obtain a modified microsphere dispersion;

[0072] Step S2: Preparation of structural color fabric

[0073] 15 mL of the modified microsphere dispersion was added to 40 mL of the hydrogel prepolymer solution prepared in Example 6. After ultrasonic dispersion, 12 g of the pretreated fabric was added and immersed and stirred for 5 min. After taking out, the fabric was UV-cured on the surface of a 0.2 T magnet for 30 min. After washing and drying, a humidity-responsive structural color fabric was obtained.

[0074] Comparative Example 4

[0075] Compared with Example 7, the difference is that the modified microspheres prepared in Comparative Example 1 are used, and the other raw materials and steps are the same.

[0076] Comparative Example 5

[0077] Compared with Example 7, the difference is that the modified microspheres prepared in Comparative Example 2 are used, and the other raw materials and steps are the same.

[0078] Comparative Example 6

[0079] Compared with Example 7, the difference is that the hydrogel prepolymer solution prepared in Comparative Example 3 is used, and the other raw materials and steps are the same.

[0080] Performance tests were performed on Examples 7 to 9 and Comparative Examples 4 to 6. Humidity multicolor response performance test: the surface of a sample with a specification of 4 cm×4 cm was gradually wetted with an equal amount of ultrapure water, and whether the color of the fabric surface produced a multicolor response according to the humidity during the wetting process; washing fastness test: referring to GB / T3921-2008, the reflectivity before and after washing was tested before and after 10 times; reflection spectrum test: the reflectivity before and after washing was tested using a fiber optic spectrometer at a wavelength of 650 nm. The results are shown in Table 1:

[0081] Table 1

[0082]

[0083] It can be seen from Table 1 that the reflectance of the structural color fabrics prepared from modified microspheres and hydrogel prepolymers in Examples 7-9 before and after washing is greater than that of Comparative Examples 4-6, and they have good wash fastness. At the same time, they can achieve multi-color response during the wetting process and have good humidity response performance. In addition, compared with Comparative Examples 4 and 6, Example 7 can not only achieve multi-color response, but also has a higher reflectance, indicating that the structural color fabric prepared under the synergistic effect of modified microspheres and hydrogel prepolymers has better humidity response performance.

[0084] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0085] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a humidity-responsive structural color fabric, characterized in that: The following steps are involved: Step S1, washing the spandex fabric with ethanol and deionized water alternately by ultrasonic washing, drying, and subjecting the fabric to oxygen plasma treatment at 200 W for 2 min to obtain a pretreated fabric; Step S2, adding the modified microsphere dispersion to the hydrogel prepolymer solution, after ultrasonic dispersion, adding the pretreated fabric, immersing and stirring for 5 minutes, taking out and UV curing on the surface of a 0.2T magnet for 20-30 minutes, and then washing and drying to obtain a humidity-responsive structural color fabric.

2. The method for preparing a humidity responsive structural color fabric according to claim 1, characterized in that: The usage ratio of the hydrogel prepolymer liquid, the modified microsphere dispersion liquid and the pretreated fabric is 40 mL: 15 mL: 10-12 g.

3. The method for preparing a humidity responsive structural color fabric according to claim 1, characterized in that: The hydrogel prepolymer solution is prepared by the following steps: Add acrylamide and acrylic acid to the alcohol solution, stir and mix, add N,N-methylenebisacrylamide, ultrasonically dissolve, then add 2-hydroxy-2-methylpropiophenone, mix evenly, and obtain a hydrogel prepolymer solution.

4. The method for preparing a humidity responsive structural color fabric according to claim 3, characterized in that: The alcohol solution, acrylamide, acrylic acid, N,N-methylenebisacrylamide and 2-hydroxy-2-methylpropiophenone are used in a ratio of 60 mL: 18-20 g: 1-2 mL: 0.5-1.5 g: 0.5-1 mL; the alcohol solution is composed of ethanol and ethylene glycol in a volume ratio of 1:1-2.

5. The method for preparing a humidity responsive structural color fabric according to claim 1, characterized in that: The modified microsphere dispersion is prepared by dispersing 6-8 g of modified microspheres in 20 mL of ethylene glycol.

6. The method for preparing a humidity responsive structural color fabric according to claim 1, characterized in that: The modified microspheres are prepared by the following steps: A1. Add magnetic iron oxide to deionized water, stir and disperse, then add oleic acid at 80-90°C, stir and react for 1-1.5h, cool, filter, wash, dry, and then place in n-octane, stir and disperse to obtain a magnetic fluid; A2. Add styrene and hexadecane to the magnetic fluid, and after ultrasonic dispersion, add an aqueous solution of sodium dodecyl sulfate dropwise while stirring. After the addition is complete, add potassium persulfate, and continue to react at 70-80°C for 16-18h. Then, filter, wash with deionized water, and dry to obtain modified microspheres.

7. The method for preparing a humidity responsive structural color fabric according to claim 6, characterized in that: The usage ratio of the deionized water, magnetic iron oxide, oleic acid and n-octane is 80 mL: 2-4 g: 0.5-2 mL: 50 mL.

8. The method for preparing a humidity responsive structural color fabric according to claim 6, characterized in that: The usage ratio of the magnetic fluid, styrene, hexadecane, the aqueous solution of sodium dodecyl sulfonate and potassium persulfate is 50 mL: 4-8 g: 1 g: 80 mL: 0.3 g; the concentration of the aqueous solution of sodium dodecyl sulfonate is 0.9-1.4 wt %.

9. A humidity responsive structural color fabric, characterized in that: Prepared according to the preparation method according to any one of claims 1-8.

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