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CN-121992673-A - Reversible humidity-sensitive color-changing fabric and preparation method and application thereof

CN121992673ACN 121992673 ACN121992673 ACN 121992673ACN-121992673-A

Abstract

The invention belongs to the technical field of functional textiles, and discloses a reversible humidity-sensitive color-changing fabric and a preparation method and application thereof. The preparation method comprises the steps of S1, dissolving a compound K 6 Na 17 [H 3 {Co(H 2 O) 3 } 2 (P 4 Nb 9 O 40 ) 2 ]·24H 2 O in a small amount of water, adding an adhesive and printing paste, adding a proper amount of water, continuously stirring to be sticky to obtain slurry, S2, printing the slurry on a cotton fabric subjected to cleaning and drying treatment by a magnetic bar printing machine, and pre-drying and baking to obtain the humidity-sensitive color-changing fabric. The reversible humidity-sensitive color-changing fabric presents purple red in an air environment, changes blue in a 50-70 ℃ anhydrous environment, changes water in contact with air into purple red immediately, and repeats 5 color-changing-fading experiments, still has good fatigue resistance, lays a foundation for the development of functional fabrics in the future, and can be applied to humidity sensors and the like.

Inventors

  • LIANG ZHIJIE
  • MAO QINGHUI
  • HUANG ZUMING
  • WU YANHONG

Assignees

  • 南通大学

Dates

Publication Date
20260508
Application Date
20260123

Claims (10)

  1. 1. A method for preparing reversible humidity-sensitive color-changing fabric, which is characterized by comprising the following steps: S1, dissolving a moisture-sensitive compound with water, adding an adhesive and printing paste, adding water, and continuously stirring to be sticky to obtain slurry, wherein the molecular formula of the moisture-sensitive compound is K 6 Na 17 [H 3 {Co(H 2 O) 3 } 2 (P 4 Nb 9 O 40 ) 2 ]·24H 2 O; S2, printing the slurry on cotton fabric subjected to cleaning and drying treatment, and pre-drying and baking to obtain the reversible humidity-sensitive color-changing fabric loaded with the humidity-sensitive compound.
  2. 2. The method of claim 1, wherein the adhesive is an acrylic urethane co-polymer adhesive.
  3. 3. The method of claim 1, wherein the printing paste is an aqueous sodium alginate solution having a concentration of 5 wt%.
  4. 4. The method according to claim 1, wherein the compound, the binder and the printing paste are used in the step S1 in an amount of 0.2 to 0.8 g of the compound, 0.05 to 0.1 g of the binder and 5 to 8 g of the printing paste per 10g of the slurry.
  5. 5. The method according to claim 1, wherein in step S2, the pre-baking temperature is 70-80 ℃ and the time is 1-10 min.
  6. 6. The method according to claim 1, wherein in step S2, the baking temperature is 90 to 120 ℃ and the baking time is 1 to 10 min.
  7. 7. A reversible humidity-sensitive color-changing fabric prepared according to the preparation method of any one of claims 1 to 6.
  8. 8. The reversible, humidity-sensitive color-changing fabric of claim 7 wherein the reversible, humidity-sensitive color-changing fabric exhibits a mauve color when the humidity-sensitive compound of the reversible, humidity-sensitive color-changing fabric load is in a hydrated state and a blue color when the humidity-sensitive compound of the reversible, humidity-sensitive color-changing fabric load is in a dehydrated state.
  9. 9. The reversible, moisture-sensitive color-changing fabric of claim 7, wherein the reversible, moisture-sensitive color-changing fabric exhibits a mauve color in an air environment and remains blue in a 50-70 ℃ anhydrous environment.
  10. 10. Use of a reversible humidity-sensitive color-changing fabric as defined in claim 7 in a humidity sensor.

Description

Reversible humidity-sensitive color-changing fabric and preparation method and application thereof Technical Field The invention belongs to the technical field of functional textiles, and relates to a reversible humidity-sensitive color-changing fabric and a preparation method and application thereof. Background The fabric is a sheet-shaped object woven by textile fibers, is mainly used in clothing, decoration, industry and the like, is an indispensable material in daily life, and is changed from traditional to functional along with the continuous development of the textile industry. The color change behavior can be achieved, for example, by treating the textile fibers. Wherein moisture discoloration refers to a material that is capable of undergoing a change in light absorption or emission properties upon stimulation by water vapor. In contrast, the external stimuli required for humidity-sensitive discoloration are milder. The dehydration process may be accomplished by heating, contact with a desiccant, or vacuum drying, and the water absorption process may contact the material with liquid water or water vapor. Based on the characteristics, the humidity-sensitive color-changing material can be widely applied to visual monitoring, duplicating paper, humidity sensor, human sweat pore mapping and paint and coating industries. Patent (CN 202210489345) discloses a dicarboxylic acid Ni (II) water-based electrochromic coordination polymer with a 2D-3D poly-locking structure and a preparation method thereof, but the color-changing temperature range of the complex is 150-267 ℃, the color-changing point temperature is higher, and the application range in daily life is narrower. Patent (CN 202311589049) discloses a water-borne reversible color-changing PVC material, wherein the water-borne color-changing agent is benzotriazole compound or benzotriazole compound. The patent (CN 202510786653) discloses a preparation method of a cellulose-based water-induced deformation and discoloration film, wherein the discoloration is caused by light scattering to change the surface color of the film from red to light red after the film absorbs water and swells. There is little research on humidity sensitive color change fabrics from the presently published patents and most of the disclosures are immersed in water, predominantly in water-induced color change, with low sensitivity to moisture. Accordingly, there is a need to develop a color shifting fabric that is moisture sensitive. Disclosure of Invention In view of the above, the present invention provides a reversible humidity-sensitive color-changing fabric which immediately turns to mauve when being contacted with water in the air and has excellent fatigue resistance, a preparation method and application thereof. The invention provides a preparation method of reversible humidity-sensitive color-changing fabric, which is characterized by comprising the following steps: S1, dissolving a moisture-sensitive compound with water, adding an adhesive and printing paste, adding water, and continuously stirring to be sticky to obtain slurry, wherein the molecular formula of the moisture-sensitive compound is K6Na17[H3{Co(H2O)3}2(P4Nb9O40)2]·24H2O; S2, printing the slurry on cotton fabric subjected to cleaning and drying treatment, and pre-drying and baking to obtain the reversible humidity-sensitive color-changing fabric loaded with the humidity-sensitive compound. K6Na17[H3{Co(H2O)3}2(P4Nb9O40)2]·24H2O In the cobalt niobium oxygen cluster compound, cobalt ions have a hexacoordinated configuration, and three atoms in addition to three oxygen atoms in the niobium oxygen cluster are water molecules. Based on coordination theory, the color displayed by cobalt ions is related to the number of water molecules and the coordination configuration of the cobalt ions, the bond energy of the coordination bonds is small, dissociation and recombination of the bonds can occur under proper conditions, and different colors can be displayed due to different numbers of water molecules. Further, the adhesive is an acrylic polyurethane copolymer adhesive. Adhesive 939 is preferred. Further, the printing paste is an aqueous solution of sodium alginate with a concentration of 5 wt%. Further, in the step S1, the compound, the binder and the printing paste are used in an amount of 0.2 to 0.8 g of the compound, 0.05 to 0.1 g of the binder and 5 to 8g of the printing paste per 10g of the slurry. Further, in step S2, the cleaning and drying treatment refers to that the cotton fabric is soaked in an ethanol solution for cleaning, then is washed with water, taken out and dried. Further, in the step S2, the pre-baking temperature is 70-80 ℃ and the pre-baking time is 1-10 min. In the step S2, the baking temperature is 90-120 ℃ and the baking time is 1-10 min. The invention also provides the reversible humidity-sensitive color-changing fabric prepared by the preparation method. Further, when the humidity-sensitive com