Intelligent fabric with non-iridescent structural color and temperature adjusting function and preparation method thereof

Abstract

The invention discloses an intelligent fabric with a non-iridescent structural color and a temperature adjusting function and a preparation method of the intelligent fabric, and belongs to the technical field of fabric materials. The photon nano pigment is loaded on the matrix fabric, is a hollow silicon dioxide nanosphere with a disordered metasurface and an inner wall carbon layer, and can generate a non-iridescent structural color without being assembled; the phase-change material is lauric acid, and the phase-change material absorbs or releases latent heat through solid-liquid phase change so as to realize temperature regulation; the molten lauric acid after phase change is adsorbed on the surfaces of the hollow silicon dioxide nanospheres and forms hydrogen bond crosslinking with oxygen anions on the surfaces of the hollow silicon dioxide; the water-based acrylic resin is used as an adhesive to fix the photon nano pigment and the phase-change material, and forms hydrogen bond crosslinking with the molten lauric acid to prevent leakage of the phase-change material. The intelligent fabric disclosed by the invention can present a non-iridescent structural color without being assembled, and the temperature can be adjusted by absorbing and releasing heat energy.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric materials, and particularly to an intelligent fabric with non-iridescent structural color and temperature regulation function and a preparation method thereof. Background Art

[0002] The structural color generation and phase change temperature regulation of fabrics are innovative development trends in the textile field. However, the inevitable assembly process of structural color and the leakage problem of phase change materials make it extremely difficult to achieve this goal. Structural color is a color originating from the physical interaction between light and micro-nano structures. The generation mechanism of structural color endows it with advantages such as chemical stability, light stability, and environmental friendliness, making it have the potential to replace organic dyes and pigments in fabric dyeing. Currently, structural color is mainly generated by photonic crystals formed by ordered micro-nano structures and amorphous photonic structures formed by micro-nano structures with short-range order and long-range disorder. In recent years, many studies have reported the application of photonic crystals and amorphous photonic structures in fabric dyeing. For example, colloidal photonic crystals of silica, polystyrene, and polymethyl methacrylate are deposited on the fabric surface by vertical self-assembly method, and the dispersion liquids of cuprous oxide, titanium dioxide, and polysulfide colloids are sprayed on the fabric to assemble amorphous photonic structures. Generally speaking, whether forming photonic crystals or amorphous photonic structures on the fabric surface, the assembly of colloids is required. However, these assembly processes are relatively delicate and time-consuming. In addition, the fine structures formed during the assembly process are easily damaged by external forces, which may lead to color fading or even disappearance. Therefore, it is very necessary to obtain structural color on the fabric that does not require assembly and has an appearance similar to absorbent dyes.

[0003] In addition to color, the functionality of fabrics is another important development trend of fabrics. In particular, the temperature regulation function of fabrics has become a hot international research topic. Phase change materials (PCMs) are used as temperature regulation materials and are widely used in the preparation of temperature regulation fabrics because they can absorb or release latent heat at a specific temperature, thereby reducing the fluctuation of the external environmental temperature. When preparing phase change fibers for making phase change fabrics, usually, the phase change material is blended with a polymer and then spun, or the phase change material is impregnated into the pores of hollow fibers using a core-shell structure. However, the prepared phase change fibers have certain limitations, including problems such as easy leakage of the phase change material and insufficient mechanical strength of the fibers. The method of loading the phase change material and phase change microcapsules onto the fabric through a post-treatment process is relatively simple and direct. However, due to the limited loading amount, this kind of temperature regulation fabric usually has a low phase change enthalpy.

[0004] The combination of color and temperature regulation function is a prerequisite for the realization of wearable applications of temperature-regulating fabrics. Current research has found that by assembling polysulfide microspheres on cotton fabrics modified with aqueous polyurethane phase change materials to form an amorphous photonic structure, and then spraying aqueous polyurethane phase change materials to further fix the amorphous photonic structure, colored phase change fabrics can be prepared. Although this method realizes the combination of structural color and phase change temperature regulation function, its preparation process includes a complex and time-consuming interfacial assembly process in an oven. And considering the flexibility and breathability of the fabric, the amount of aqueous polyurethane phase change material used as an adhesive is extremely small, resulting in a very low phase change enthalpy of the fabric. Therefore, developing colored phase change fabrics with structural color and high phase change enthalpy through a simple and scalable preparation method is a problem that needs to be solved currently. Summary of the Invention

[0005] The object of the present invention is to provide an intelligent fabric with non-iridescent structural color and temperature regulation function and its preparation method, so as to solve problems such as complex assembly of traditional structural color and leakage of phase change materials.

[0006] To achieve the above object, the present invention provides an intelligent fabric with non-iridescent structural color and temperature regulation function, including:

[0007] A substrate fabric;

[0008] Photonic nanomaterials loaded on the substrate fabric, the photonic nanomaterials are hollow silica (H-SiO 2 ) nanospheres with a disordered metasurface and an inner wall carbon layer, and the photonic nanomaterials can generate non-iridescent structural color without assembly;

[0009] A phase change material loaded on the substrate fabric, the phase change material is lauric acid (Lauric Acid, abbreviated as LA), which absorbs or releases latent heat through solid-liquid phase change to achieve temperature regulation; the molten LA after phase change adsorbs on the surface of H-SiO 2 nanospheres and forms hydrogen bond cross-linking with the oxygen anions on the surface of H-SiO 2 nanospheres;

[0010] Waterborne acrylic resin (abbreviated as WA) is used as an adhesive to fix the photonic nanomaterials and the phase change material, and forms hydrogen bond cross-linking with the molten LA to prevent the leakage of the phase change material.

[0011] Preferably, in the above intelligent fabric with non-iridescent structural color and temperature regulation function, the Zeta potential of the photonic nanomaterials is -30 to -40 mV and the polydispersity index (PDI) ≤ 0.1 after being modified by water etching.

[0012] Preferably, in the above-mentioned intelligent fabric with non-iridescent structural color and temperature regulation function, the optimal mass percentage of LA in the fabric is 23.2 wt%, and the optimal mass percentage of H-SiO 2 photon nanometer pigment in the fabric is 15.5 wt%.

[0013] Provided is a preparation method of an intelligent fabric with non-iridescent structural color and temperature regulation function, including the following steps:

[0014] (1) Synthesize H-SiO 2 photon nanometer pigment:

[0015] a. Synthesize polystyrene seeds by soap-free emulsion polymerization method;

[0016] b. Coating a silica layer on the surface of the polystyrene seeds by the Stöber method to obtain PS@SiO 2 nanospheres;

[0017] c. Alkaline etching the PS@SiO 2 nanospheres, and calcining at high temperature to remove the residual polystyrene to obtain H-SiO 2 nanospheres;

[0018] d. Carry out hydroetching modification on the H-SiO 2 nanospheres, and obtain H-SiO 2 photon nanometer pigment by centrifugation;

[0019] (2) Prepare a structural color temperature regulation fabric:

[0020] a. Immerse the substrate fabric in a WA solution with a concentration of 80 wt% to form a pretreatment layer;

[0021] b. Immerse the fabric treated in step (2a) in an H-SiO 2 @LA solution, and the preparation method of the H-SiO 2 @LA solution is to mix the H-SiO 2 photon nanometer pigment and LA and then add them to absolute ethanol;

[0022] c. Immerse the fabric treated in step (2b) twice in a WA solution with a concentration of 3 wt%, and dry to obtain the intelligent fabric.

[0023] Preferably, in the above preparation method of the intelligent fabric with non-iridescent structural color and temperature regulation function, the specific process of the step (1a) is as follows: Dissolve 3.75 g of polyvinylpyrrolidone and 0.65 g of 2,2'-azobis(2-methylpropionamidine) dihydrochloride in 250 mL of deionized water, stir after ultrasonic dispersion; Add 25 g of styrene, and stir the mixture at 70 °C for 24 hours to obtain polystyrene seeds.

[0024] Preferably, in the above preparation method of the intelligent fabric with non-iridescent structural color and temperature regulation function, the specific process of the step (1b) is as follows: Uniformly disperse the polystyrene seeds in a mixed solvent composed of 350 mL of absolute ethanol and 20 mL of deionized water by ultrasonic stirring to form a suspension; Add 20 mL of ammonia water to the uniform suspension, and then add 20 mL of tetraethyl orthosilicate; Stir the mixture at room temperature for 8 hours to obtain PS@SiO 2 nanospheres;

[0025] Preferably, in the above preparation method of the intelligent fabric with non-iridescent structural color and temperature regulation function, the specific process of the step (1c) is as follows: Redisperse the obtained PS@SiO 2 nanospheres in 50 mL of deionized water, add 5 mL of a sodium hydroxide solution with a concentration of 0.01 g / mL, stir the mixture at room temperature for 30 minutes to obtain etched PS@e-SiO 2 nanospheres, perform centrifugal washing and drying, and calcine the dried PS@e-SiO 2 nanospheres in a muffle furnace at 500 °C for 4 hours to obtain H-SiO 2 nanospheres.

[0026] Preferably, in the above preparation method of the intelligent fabric with non-iridescent structural color and temperature regulation function, the specific process of the step (1d) is as follows: Disperse 1 g of H-SiO 2 nanospheres in 45 mL of deionized water, and adjust the pH value of the mixture to 12 using ammonia water; After stirring at 95 °C for 10 hours, obtain H-SiO 2 photonic nano-pigment by centrifugation.

[0027] Preferably, in the above preparation method of the intelligent fabric with non-iridescent structural color and temperature regulation function, the substrate fabric is a cotton fabric, a polyester fabric or a blended fabric.

[0028] Therefore, the present invention adopts the above-structured intelligent fabric with non-iridescent structural color and temperature regulation function and its preparation method, and successfully develops non-iridescent structural color temperature regulation fabrics (SCTFs) by one-step loading of photonic nano-pigments and phase change materials. H-SiO with disordered metasurface and inner wall carbon layer 2The photonic nanometer pigment is used as a color-forming component, and can present an iridescent structural color without assembly. LA with solid-liquid phase change performance is mixed with H-SiO 2 nanospheres, and can adjust the temperature by absorbing and releasing heat energy. At the same time, the molten LA after phase change can also be adsorbed on the surface of H-S iO 2 nanospheres, and form hydrogen bond crosslinking with the oxygen anions on the surface of H-SiO 2 nanospheres. In addition, a highly viscous binder WA is introduced to fix the H-SiO 2 photonic nanometer pigment, and form hydrogen bonds with the molten LA, so as to more effectively prevent the leakage of LA. The prepared structural color temperature-regulating fabric presents a stable iridescent structural color in the temperature range of 20°C to 100°C, and does not decompose, showing excellent thermal stability. The melting enthalpy and crystallization enthalpy of the structural color temperature-regulating fabric are as high as 38.94 joules per gram and 40.51 joules per gram respectively. After 100 thermal cycles, the phase change enthalpy of the fabric still remains relatively stable, showing excellent thermal cycle stability. In addition, the structural color temperature-regulating fabric shows excellent durability under various conditions, including folding, curling, ultrasonic treatment, washing, and exposure to acidic or alkaline environments. This structural color temperature-regulating fabric not only has an iridescent structural color and a high phase change enthalpy, but also shows significant advantages in terms of durability, thermal stability, and phase change temperature-regulating performance.

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0030] Figure 1 Digital photos of the green SCTF with different LA contents in the embodiments of the present invention at 30°C and 80°C;

[0031] Figure 2 Digital photos of the green SCTF with different contents of H-SiO 2 photonic nanometer pigments in the embodiments of the present invention;

[0032] Figure 3 Reflection spectrogram of the green SCTF with different contents of H-SiO 2 photonic nanometer pigments in the embodiments of the present invention;

[0033] Figure 4 Reflection spectrogram of the color of SCTF-4 in the embodiments of the present invention at different viewing angles;

[0034] Figure 5 Reflection wavelength diagram of four different colors of SCTF-4 in the embodiments of the present invention at different viewing angles.

[0035] Figure 6The reflection spectrum diagram of SCTF at different temperatures in the embodiments of the present invention;

[0036] Figure 7 The reflection spectrum diagram of SCTF in the temperature cycle test in the embodiments of the present invention;

[0037] Figure 8 The differential scanning calorimetry (DSC) curve of SCTF with different LA contents in the embodiments of the present invention;

[0038] Figure 9 The melting enthalpy and crystallization enthalpy images of SCTF with different LA contents in the embodiments of the present invention;

[0039] Figure 10 The curve diagram of the change of phase transition temperature and phase transition enthalpy with temperature during the thermal cycle test in the embodiments of the present invention;

[0040] Figure 11 The heating thermal response images of SCTF-4 and cotton fabric in the embodiments of the present invention taken at different time intervals;

[0041] Figure 12 The temperature-time curve of the melting of SCTF-4 in the embodiments of the present invention;

[0042] Figure 13 The cooling thermal response images of SCTF-4 and cotton fabric in the embodiments of the present invention taken at different time intervals;

[0043] Figure 14 The temperature-time curve of the crystallization of lauric acid in the embodiments of the present invention;

[0044] Figure 15 The front and back comparison diagrams of SCTF-4 in the embodiments of the present invention that can withstand folding, curling, washing, ultrasonic treatment, and acid-base immersion treatment;

[0045] Figure 16 The spectrum diagrams of SCTF-4 in the embodiments of the present invention before and after being able to withstand folding, curling, washing, ultrasonic treatment, and acid-base immersion treatment;

[0046] Figure 17 The differential scanning calorimetry (DSC) curves of SCTF-4 before and after being folded, curled, washed, ultrasonically treated, and acid-base immersed in the embodiments of the present invention. Detailed implementation manners

[0047] To better understand the above technical solutions, the following will describe the above technical solutions in detail in conjunction with the accompanying drawings of the specification and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0048] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0049] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such commodity or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or device including the said element.

[0050] The present invention provides an intelligent fabric with non-iridescent structural color and temperature regulation function, including:

[0051] A substrate fabric;

[0052] Photon nanometer pigments loaded on the substrate fabric, the photon nanometer pigments being H-SiO 2 nanospheres with disordered metasurfaces and inner wall carbon layers, and the photon nanometer pigments can generate non-iridescent structural color without assembly;

[0053] A phase change material loaded on the substrate fabric, the phase change material being LA, which absorbs or releases latent heat through solid-liquid phase change to achieve temperature regulation; the molten LA after phase change adsorbs on the surface of the H-SiO 2 nanospheres and forms hydrogen bond cross-linking with the oxygen anions on the surface of the H-SiO 2 nanospheres;

[0054] WA is used as an adhesive to fix the photon nanometer pigments and the phase change material, and forms hydrogen bond cross-linking with the molten LA to prevent the leakage of the phase change material.

[0055] To further optimize the above technical solution, the Zeta potential of the H-SiO 2 nanospheres is -30 to -40 mV and the polydispersity index (PDI) ≤ 0.1 after being modified by water etching.

[0056] To further optimize the above technical solution, the optimal mass percentage of LA in the fabric is 23.2 wt%, and the optimal mass percentage of the H-SiO 2 photon nanospheres in the fabric is 15.5 wt%.

[0057] Provided is a preparation method of an intelligent fabric with non-iridescent structural color and temperature regulation function, including the following steps:

[0058] (1) Synthesize H-SiO 2 photon nanospheres:

[0059] a. Synthesize polystyrene seeds by soap-free emulsion polymerization method;

[0060] b. Coating a silica layer on the surface of the polystyrene seeds by the Stöber method to obtain PS@SiO 2 nanospheres;

[0061] c. Alkaline etching the PS@SiO 2 nanospheres and calcining at high temperature to remove the residual polystyrene to obtain H-SiO 2 nanospheres;

[0062] d. Carry out hydroetching modification on the H-SiO 2 nanospheres, and obtain H-SiO 2 photon nano-pigment by centrifugation;

[0063] (2) Prepare a structural color temperature regulation fabric:

[0064] a. Immerse the substrate fabric in an aqueous acrylic resin solution with a concentration of 80 wt% to form a pretreatment layer;

[0065] b. Immerse the fabric treated in step (2a) in an H-SiO 2 @lauric acid solution, and the preparation method of the H-SiO 2 @lauric acid solution is to mix the H-SiO 2 photon nano-pigment and lauric acid and then add them to anhydrous ethanol;

[0066] c. Immerse the fabric treated in step (2b) twice in an aqueous acrylic resin solution with a concentration of 3 wt%, and dry to obtain the intelligent fabric.

[0067] To further optimize the above technical solution, the specific process of step (1a) is as follows: Dissolve 3.75 grams of polyvinylpyrrolidone and 0.65 grams of 2,2'-azobis(2-methylpropionamidine) dihydrochloride in 250 milliliters of deionized water, stir after ultrasonic dispersion; add 25 grams of styrene, and stir the mixture at 70 °C for 24 hours to obtain polystyrene seeds.

[0068] To further optimize the above technical solution, the specific process of step (1b) is as follows: The polystyrene seeds are uniformly dispersed in a mixed solvent composed of 350 mL of absolute ethanol and 20 mL of deionized water by ultrasonic stirring to form a suspension; 20 mL of ammonia water is added to the uniform suspension, and then 20 mL of tetraethyl orthosilicate is added; The mixture is stirred at room temperature for 8 hours to obtain PS@SiO 2 nanospheres;

[0069] To further optimize the above technical solution, the specific process of step (1c) is as follows: The obtained PS@SiO 2 nanospheres are redispersed in 50 mL of deionized water, 5 mL of a sodium hydroxide solution with a concentration of 0.01 g / mL is added, and the mixture is stirred at room temperature for 30 minutes to obtain the etched PS@e-SiO 2 nanospheres, which are centrifuged, washed, and dried. The dried PS@e-SiO 2 nanospheres are calcined in a muffle furnace at 500 °C for 4 hours to obtain H-SiO 2 nanospheres.

[0070] To further optimize the above technical solution, the specific process of step (1d) is as follows: 1 g of H-SiO 2 photonic nanospheres are dispersed in 45 mL of deionized water, and the pH value of the mixture is adjusted to 12 using ammonia water; After stirring at 95 °C for 10 hours, H-SiO 2 nanopigments are obtained by centrifugation.

[0071] To further optimize the above technical solution, the substrate fabric is a cotton fabric, a polyester fabric, or a blended fabric.

[0072] To more clearly and detailedly introduce the intelligent fabric with non-iridescent structural color and temperature regulation function and its preparation method provided by the embodiments of the present invention, the following will be described in combination with specific embodiments.

[0073] Example 1

[0074] 3.75 g of polyvinylpyrrolidone and 0.65 g of 2,2'-azobis(2-methylpropionamidine) dihydrochloride are dissolved in 250 mL of deionized water, ultrasonically dispersed, and then stirred; 25 g of styrene is added, and the mixture is stirred at 70 °C for 24 hours to obtain polystyrene seeds. The polystyrene seeds are uniformly dispersed in a mixed solvent composed of 350 mL of absolute ethanol and 20 mL of deionized water by ultrasonic stirring to form a suspension; 20 mL of ammonia water is added to the uniform suspension, and then 20 mL of tetraethyl orthosilicate is added; The mixture is stirred at room temperature for 8 hours to obtain PS@SiO 2 nanospheres; The obtained PS@SiO2 The nanospheres were redispersed in 50 mL of deionized water, and 5 mL of a sodium hydroxide solution with a concentration of 0.01 g / mL was added. The mixture was stirred at room temperature for 30 minutes to obtain etched PS@e-SiO 2 nanospheres, which were centrifuged, washed, and dried. The dried PS@e-SiO 2 nanospheres were calcined in a muffle furnace at 500 °C for 4 hours to obtain H-SiO 2 nanospheres. 1 g of the H-SiO 2 nanospheres was dispersed in 45 mL of deionized water, and the pH value of the mixture was adjusted to 12 using ammonia water; after stirring at 95 °C for 10 hours, H-SiO 2 photonic nanopygments were obtained by centrifugation.

[0075] The substrate fabric was impregnated in a WA solution with a concentration of 80 wt%, forming a pretreatment layer; different masses of LA and 4 g of H-SiO 2 photonic nanopygments were mixed to obtain mixtures with LA mass fractions of 30%, 40%, 50%, 60%, and 65%. After mixing, they were added to absolute ethanol to obtain H-SiO 2 @LA solutions. The treated fabric was impregnated in the H-SiO 2 @LA solutions; finally, the treated fabric was impregnated again in a WA solution with a concentration of 3 wt%. After the final drying step, a series of structural color thermoregulatory fabrics (SCTFs) with different LA contents were prepared. Through calculation, the LA contents in the structural color thermoregulatory fabrics were determined to be 7.9 wt%, 12.2 wt%, 17.0 wt%, 23.2 wt%, and 26.5 wt% respectively. These fabrics were labeled as SCTF-1, SCTF-2, SCTF-3, SCTF-4, and SCTF-5, as shown in Table 1.

[0076] Table 1 Accurate data of LA content in SCTFs

[0077]

[0078]

[0079] In the table: W 1 is the mass of the WA-modified cotton fabric;

[0080] W 2 is the mass of the H-SiO 2 @LA-modified cotton fabric;

[0081] W 3 is the mass of the SCTF;

[0082] ω 1is the mass fraction of LA in the H-S iO 2 @LA mixture;

[0083] ω 2 is the mass fraction of LA in SCTF.

[0084] Example 2

[0085] Dissolve 3.75 g of polyvinylpyrrolidone and 0.65 g of 2,2'-azobis(2-methylpropionamidine) dihydrochloride in 250 mL of deionized water, stir after ultrasonic dispersion; add 25 g of styrene, stir the mixture at 70 °C for 24 h to obtain polystyrene seeds. Disperse the polystyrene seeds evenly in a mixed solvent composed of 350 mL of absolute ethanol and 20 mL of deionized water by ultrasonic stirring to form a suspension; add 20 mL of ammonia water to the homogeneous suspension, and then add 20 mL of tetraethyl orthosilicate; stir the mixture at room temperature for 8 h to obtain PS@S iO 2 nanospheres; redisperse the obtained PS@SiO 2 nanospheres in 50 mL of deionized water, add 5 mL of sodium hydroxide solution with a concentration of 0.01 g / mL, stir the mixture at room temperature for 30 min to obtain etched PS@e-S i O 2 nanospheres, centrifuge, wash and dry. Calcinate the dried PS@e-S i O 2 nanospheres in a muffle furnace at 500 °C for 4 h to obtain H-S i O 2 nanospheres. Disperse 1 g of H-S i O 2 nanospheres in 45 mL of deionized water, adjust the pH value of the mixture to 12 with ammonia water; after stirring at 95 °C for 10 h, obtain H-S i O 2 photonic nanomaterials by centrifugation.

[0086] Immerse the substrate fabric in a WA solution with a concentration of 80 wt% to form a pretreatment layer; mix different masses of H-SiO 2 photonic nanomaterials and 4 g of LA to obtain mixtures with mass fractions of 10%, 20%, 30%, 40% and 50% of H-S iO 2 photonic nanomaterials respectively. After mixing, add them to absolute ethanol to obtain H-S iO 2 @LA solution. Immerse the treated fabric in the H-S i O 2 @LA solution; finally, immerse the treated fabric twice in a WA solution with a concentration of 3 wt%. After the last drying step, a series of different H-S iO 2Structural color thermoregulatory fabrics (SCTFs) with photon nanometer pigment content. It is calculated that the content of H - SiO 2 The contents of photon nanometer pigments in the structural color thermoregulatory fabrics are determined to be 3.8 wt%, 7.2 wt%, 11.3 wt%, 15.5 wt% and 20.3 wt% respectively. These fabrics are labeled as SCTF - 6, SCTF - 7, SCTF - 8, SCTF - 9 and SCTF - 10 respectively, as shown in Table 2.

[0087] Table 2 Accurate data of the content of H - SiO 2 photon nanometer pigments in SCTFs

[0088] <![CDATA[W 1 (g)]]> <![CDATA[W 2 (g)]]> <![CDATA[W 3 (g)]]> <![CDATA[ω 1 (wt%)]]> <![CDATA[ω 2 (wt%)]]> SCTF-1 0.13 0.21 0.22 10 3.8 SCTF-2 0.14 0.22 0.23 20 7.2 SCTF-3 0.14 0.23 0.24 30 11.3 SCTF-4 0.14 0.24 0.25 40 15.5 SCTF-5 0.14 0.25 0.26 50 20.3

[0089] In the table: W 1 is the mass of the WA - modified cotton fabric;

[0090] W 2 is the mass of the H - SiO 2 @LA - modified cotton fabric;

[0091] W 3 is the mass of the SCTF;

[0092] ω 1 is the mass fraction of the H - SiO 2 photon nanometer pigment in the H - SiO 2 @LA mixture;

[0093] ω 2 is the mass fraction of the H - SiO 2 photon nanometer pigment in the SCTF.

[0094] To evaluate the influence of the LA content in the fabric on the shape stability of the fabric, a setting test was carried out during the process of the temperature rising from 30 °C to 80 °C, as Figure 1 shown. When the LA content increased from 7.9 wt% to 23.2 wt% (corresponding to SCTF - 1 to SCTF - 4), no leakage phenomenon occurred in the fabric. When the LA content in the fabric reached 26.5 wt% (corresponding to SCTF - 5), leakage occurred during the heating process. To obtain a fabric with high phase change enthalpy and good shape stability, the optimal content of LA in the fabric is 23.2 wt%. In addition, fabrics containing different contents of H - SiO 2 photon nanometer pigments were prepared, as Figure 2 shown. As the content of the H - SiO 2 photon nanometer pigment increased from 3.8 wt% to 15.5 wt%, the color of the fabric gradually became uniform and bright. However, when the H - SiO 2When the content of the photon nanometer pigment continues to increase to 20.3 wt%, there is no obvious change in the color of the fabric. The height of the reflection peak of the fabric increases with the increase of the content of the H-SiO 2 photon nanometer pigment in the fabric. When the content of the H-S iO 2 photon nanometer pigment increases to 15.5 wt%, the height of the reflection peak of the fabric hardly changes any more, as Figure 3 shown. The composition of the fabric containing 15.5 wt% H-S iO 2 photon nanometer pigment is exactly the same as that of the fabric containing 23.2 wt% LA. Therefore, in order to obtain a fabric with both beautiful structural color and excellent shape stability, the optimal contents of LA and H-S iO 2 photon nanometer pigment in the fabric are determined to be 23.2 wt% and 15.5 wt% respectively (corresponding to SCTF-4).

[0095] The structural color of SCTF-4 originates from the H-S iO 2 photon nanometer pigment with a disordered metasurface and an inner wall carbon layer, and these pigments endow the fabric with a non-iridescent hue. The color of SCTF-4 remains consistent at different observation angles, demonstrating its non-iridescent characteristics. When the detection angle changes, the reflection spectrum hardly changes, as Figure 4 shown. As the detection angle changes, the maximum reflection wavelength remains unchanged, as Figure 5 shown, which further proves its non-iridescent characteristics.

[0096] The structural color of SCTF-4 is not only non-iridescent but also has thermal stability. The structural color of SCTF-4 remains consistent at temperatures of 20 °C, 40 °C, 60 °C, 80 °C, and even 100 °C. At different temperatures, the corresponding SCTF spectra show a high degree of consistency, as Figure 6 shown. The thermal stability of the structural color is mainly attributed to two factors. First, the structural color of SCTF-4 originates from the H-S iO 2 photon nanometer pigment with thermal stability. Second, when the temperature rises from 20 °C to 100 °C, the crystalline LA uniformly distributed in the fabric will turn into a molten state. The molten LA will adsorb on the surface of the H-S iO 2 photon nanometer pigment and form hydrogen bond cross-linking with the oxygen anions on the surface of the H-SiO 2 photon nanometer pigment. At the same time, WA acts as a cross-linking agent to form hydrogen bonds with the molten LA. Therefore, LA will be retained inside the structure and will not leak or wet the fabric. This characteristic endows SCTF with excellent color thermal stability, enabling it to maintain bright colors in various usage scenarios.

[0097] To evaluate the color stability of SCTF, further thermal cycling tests were also conducted. The fabric was exposed to a high temperature environment of 100 °C for 1 minute and then naturally cooled to 20 °C. This cycle was repeated 100 times in total. The reflection spectrum of the fabric was recorded every 20 cycles, as Figure 7 shown. After 100 heating-cooling cycles, there were no obvious changes in the position and intensity of the fabric reflection spectrum. SCTF demonstrated the ability to maintain color stability under high temperature and thermal cycling conditions, showing excellent adaptability and reliability in various thermal environments.

[0098] The phase change component LA exhibited shape stability. This is because WA, as a cross-linking agent, can form hydrogen bonds with molten LA. In addition, molten LA can adsorb on the surface of 2 photonic nanomaterials, and form hydrogen bond cross-linking with the oxygen anions on the surface of 2 photonic nanomaterials. The differential scanning calorimetry (DSC) curves of SCTF with different LA contents are as Figure 8 shown, and their melting enthalpy and crystallization enthalpy are as shown in 9. Obviously, with the increase of LA content, the phase change enthalpy and temperature also increase. Due to the high melting enthalpy and crystallization enthalpy of LA, the melting enthalpy (ΔHm) and crystallization enthalpy (ΔHc) of SCTF-4 are as high as 38.94 J / g and 40.51 J / g respectively, which endows the fabric with good temperature regulation performance.

[0099] To evaluate the thermal cycling stability of SCTF, a series of thermal cycling tests were conducted. After 100 thermal cycles, there were no obvious changes in the phase change behavior of SCTF-4. Both the phase change temperature and the phase change enthalpy remained at the initial level without any obvious attenuation, as Figure 10 shown, indicating that SCTF-4 has excellent thermal cycling stability.

[0100] SCTF-4 realizes its temperature regulation ability through the phase change of LA. LA undergoes an endothermic melting process to mitigate the impact of high temperature, and an exothermic crystallization process to offset the discomfort caused by sudden temperature drop. An untreated cotton fabric was selected as the control sample. In the heating stage, both SCTF-4 and the cotton fabric were pre-treated at 15 °C for 10 minutes and then placed on a heating plate at 65 °C. Thermal response images were taken at different time intervals. As Figure 11 shown, during the heating process, compared with the cotton fabric, the speed of SCTF-4 changing from blue to red was significantly slower. This hysteresis phenomenon is attributed to the endothermic melting of LA. Figure 12 The temperature-time curve in clearly shows an obvious phase change plateau for SCTF-4. On the contrary, in the cooling stage, the fabric was pre-heated at 65 °C for 10 minutes and then quickly transferred to an environment of 15 °C. Thermal response images were taken during the cooling process. AsFigure 13 As shown, due to the exothermic crystallization of LA, the color change of SCTF-4 lags behind that of the cotton fabric. Figure 14 It shows a significant phase change plateau, indicating that heat is released during the crystallization process. SCTF-4 has obvious temperature hysteresis regions during both heating and cooling processes, which confirms that SCTF-4 can produce effective heating or cooling effects in response to environmental changes. This intelligent thermal response helps to maintain a relatively stable temperature for an object when the environmental temperature changes, demonstrating the potential of SCTF-4 as a temperature-regulating fabric.

[0101] In daily application scenarios, the durability of a fabric is the core standard for measuring its practical value. For structural color temperature-regulating fabrics, it is crucial to maintain the stability of their structural colors and the effectiveness of their temperature-regulating functions. H-S iO 2 The photon nanoscale pigments are in contact with each other and with the fabric through point contacts. By consolidating a low concentration of WA on the H-S iO 2 photon nanoscale pigments, the structural stability of the structural color temperature-regulating fabric is further enhanced. Specifically, as Figure 15 shown, SCTF-4 can withstand folding and curling while maintaining its original color and flexibility. After 30 minutes of washing and 5 minutes of ultrasonic testing, the structural color of the fabric remains basically unchanged. Corresponding to the Figure 15 photo in, the maximum reflection wavelength intensity of SCTF-4 only decreases slightly after testing, as Figure 16 shown, SCTF-4 can not only withstand folding, curling, ultrasonic treatment, and daily washing, but also tolerate complex chemical environments. After soaking SCTF-4 in hydrochloric acid solution with a pH value of 2 and ammonia water solution with a pH value of 12 for 24 hours, its color remains unchanged, demonstrating excellent chemical stability. The phase change enthalpies of SCTF-4 before and after folding, curling, washing, ultrasonic treatment, and acid-base soaking were evaluated. As Figure 17 shown, the differential scanning calorimetry (DSC) curves of SCTF-4 before and after these treatments show no obvious changes. This result indicates that the phase change enthalpy of SCTF-4 can remain stable under various conditions. This excellent thermal stability provides a strong guarantee for the reliability of the temperature-regulating performance of SCTF-4 in practical applications. Its excellent stability provides a strong guarantee for the reliability of SCTF-4 in practical applications. When the structural color temperature-regulating fabric is placed between hot water and a dry glass slide, water vapor will immediately pass through the structural color temperature-regulating fabric and then condense on the glass slide. This simple method strongly confirms that the structural color temperature-regulating fabric has excellent breathability.

[0102] Therefore, the present invention adopts the above-mentioned structure of the intelligent fabric with non-iridescent structural color and temperature regulation function and its preparation method. By loading photon nanomaterials and phase change materials in one step, the non-iridescent structural color temperature regulation fabric (SCTFs) has been successfully developed. H-SiO with disordered metasurface and inner wall carbon layer 2 The photon nanomaterials are used as the color-forming components and can present non-iridescent structural color without assembly. LA with solid-liquid phase change performance is mixed with H-SiO 2 nanospheres, and can regulate the temperature by absorbing and releasing heat energy. At the same time, the molten LA after phase change can also be adsorbed on the surface of H-SiO 2 nanospheres and form hydrogen bond crosslinking with the oxygen anions on the surface of H-SiO 2 nanospheres. In addition, a highly viscous binder WA is introduced to fix the H-SiO 2 photon nanomaterials and form hydrogen bonds with the molten LA, thereby more effectively preventing the leakage of LA. The prepared structural color temperature regulation fabric presents a stable non-iridescent structural color in the temperature range of 20°C to 100°C and does not decompose, showing excellent thermal stability. The melting enthalpy and crystallization enthalpy of the structural color temperature regulation fabric are as high as 38.94 joules per gram and 40.51 joules per gram respectively. After 100 thermal cycles, the phase change enthalpy of the fabric still remains relatively stable, showing excellent thermal cycle stability. In addition, the structural color temperature regulation fabric shows excellent durability under various conditions, including folding, curling, ultrasonic treatment, washing, and exposure to acidic or alkaline environments. This structural color temperature regulation fabric not only has non-iridescent structural color and high phase change enthalpy, but also shows significant advantages in terms of durability, thermal stability, and phase change temperature regulation performance.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. Smart fabric with non-iridescent structural color and temperature regulation function, characterized in that: include: Base fabric; A photonic nano-pigment loaded on the base fabric, wherein the photonic nano-pigment is a hollow silica nano-sphere having a disordered super surface and an inner wall carbon layer, and the photonic nano-pigment can produce non-iridescent structural color without assembly; The phase change material loaded on the base fabric is lauric acid, which absorbs or releases latent heat through solid-liquid phase change to achieve temperature regulation; the molten lauric acid after phase change is adsorbed on the surface of the hollow silica nanospheres and forms hydrogen bonds with oxygen anions on the surface of the hollow silica nanospheres; The water-based acrylic resin is used as an adhesive to fix the photonic nano-pigment and the phase change material, and forms hydrogen bonds with the molten lauric acid to prevent leakage of the phase change material.

2. The smart fabric with non-iridescent structural color and temperature regulating function according to claim 1, characterized in that After the photonic nanopigment is modified by water etching, its Zeta potential is -30 to -40 mV and its polydispersity index (PDI) is ≤0.

1.

3. The smart fabric with non-iridescent structural color and temperature regulation function according to claim 2, characterized in that: The optimal mass percentage of the lauric acid in the fabric is 23.2 wt %, and the optimal mass percentage of the photonic nano pigment in the fabric is 15.5 wt %.

4. A method for preparing a smart fabric having non-iridescent structural color and temperature regulating function according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Synthetic photonic nanopigments: a. Synthesis of polystyrene seeds by soap-free emulsion polymerization; b. The surface of polystyrene seeds was coated with a silicon dioxide layer using the Stober method to obtain PS@SiO2 nanospheres; c. Alkaline etching of PS@SiO2 nanospheres and high-temperature calcination to remove residual polystyrene to obtain hollow silica nanospheres; d. The hollow silica nanospheres are modified by water etching, and hollow silica photonic nanopigments are obtained by centrifugation; (2) Preparation of structural color temperature fabric: a. The base fabric is immersed in an aqueous acrylic resin solution having a concentration of 80wt% to form a pretreatment layer; b. The fabric treated in step (2a) is immersed in a hollow silica photon nanopigment @ lauric acid solution, wherein the hollow silica photon nanopigment @ lauric acid solution is prepared by mixing the hollow silica photon nanopigment and lauric acid and adding the mixture to anhydrous ethanol; c. The fabric treated in step (2b) is immersed in an aqueous acrylic resin solution with a concentration of 3 wt % for a second time, and the smart fabric is obtained after drying.

5. The method for preparing the smart fabric with non-iridescent structural color and temperature regulating function according to claim 4, characterized in that: The specific process of step (1a) is as follows: 3.75 g of polyvinyl pyrrolidone and 0.65 g of 2,2'-azobis(2-methylpropionamidine) dihydrochloride are dissolved in 250 ml of deionized water, and the mixture is stirred after ultrasonic dispersion; 25 g of styrene is added, and the mixture is stirred at 70° C. for 24 hours to obtain polystyrene seeds.

6. The method for preparing the smart fabric with non-iridescent structural color and temperature regulating function according to claim 4, characterized in that: The specific process of step (1b) is as follows: the polystyrene seeds are uniformly dispersed in a mixed solvent consisting of 350 ml of anhydrous ethanol and 20 ml of deionized water by ultrasonic stirring to form a suspension; 20 ml of ammonia water is added to the uniform suspension, followed by 20 ml of tetraethyl orthosilicate; the mixture is stirred at room temperature for 8 hours to obtain PS@SiO2 nanospheres.

7. The method for preparing the smart fabric with non-iridescent structural color and temperature regulating function according to claim 4, characterized in that: The specific process of the step (1c) is as follows: the obtained PS@SiO2 nanospheres are redispersed in 50 ml of deionized water, 5 ml of a sodium hydroxide solution with a concentration of 0.01 g / ml is added, and the mixture is stirred at room temperature for 30 minutes to obtain etched PS@e-SiO2 nanospheres, which are centrifugally washed and dried, and the dried PS@e-SiO2 nanospheres are calcined in a muffle furnace at 500°C for 4 hours to obtain hollow silica nanospheres.

8. The method for preparing the smart fabric with non-iridescent structural color and temperature regulating function according to claim 4, characterized in that: The specific process of step (1d) is as follows: 1 gram of hollow silica nanospheres is dispersed in 45 milliliters of deionized water, and the pH value of the mixture is adjusted to 12 using ammonia water; after stirring at 95° C. for 10 hours, hollow silica photonic nanopigment is obtained by centrifugation.

9. The method for preparing the smart fabric with non-iridescent structural color and temperature regulating function according to claim 4, characterized in that: The base fabric is cotton fabric, polyester fabric or blended fabric.

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