A wet-achromic fabric and a preparation method and application thereof

Abstract

The application discloses a kind of wet chromic fabric and its preparation method and application, preparation method includes the following steps: S1.reagent is added to pH indicator solution and is reacted to prepare reactive pH indicator;S2.above-mentioned reactive pH indicator, hydrophilic monomer, crosslinking agent, photoinitiator are dissolved in solvent to obtain finishing liquid, finishing liquid is padded on fabric, and the wet chromic fabric is obtained by photo-initiated polymerization and ion exchange reaction;The hydrophilic monomer is ammonium salt monomer.The wet chromic fabric prepared by the application has strong moisture absorption, and the color can change obviously and reversibly with the change of environmental humidity;Since pH indicator and hygroscopic material are connected with fabric by covalent bond, the fabric has the characteristics of good wear resistance and washing resistance;And the fabric also has the advantages of good flexibility and good air permeability.The wet chromic fabric of the application has wide application prospect in humidity indication, pH detection, humidity management and evaporative cooling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wet discoloring materials, in particular to a wet discoloring fabric and a preparation method and application thereof. BACKGROUND

[0002] A wet discoloring material is a material that can change color after interacting with water vapor. The color-changing silica gel used as a desiccant is a common wet discoloring material, which can not only be used for drying but also can judge the drying capacity through color change. Combining the wet discoloring function with textiles can endow the fabric with the wet discoloring property, and obtain a wet discoloring fabric with humidity management and humidity monitoring functions, which can be used to construct diversified and functional textiles. At the same time, thanks to the excellent mechanical properties of the fabric, the wet discoloring fabric is obviously superior to the conventional wet discoloring material, and has good flexibility and morphological diversity.

[0003] In recent years, studies have shown that wet discoloring materials can be prepared by humidity-induced pH discoloring agents. Specifically, after the humidity-sensitive material absorbs water vapor, it releases free protons, which induce the change of the conjugate structure of the pH indicator, and the color change is observed macroscopically. In the humidity-induced pH discoloring material, a material that can release free protons after absorbing water vapor is needed as an acid-base adjusting component to adjust the pH of the system after interacting with water; the pH indicator as the discoloring component changes color by accepting or losing protons; in addition, in order to enhance the ability of the wet discoloring material to absorb water from the air, a hygroscopic component is usually added. However, most of the wet discoloring materials based on pH indicators use inorganic materials as the base material, which has brittleness and low mechanical properties, which may hinder its potential application.

[0004] The prior art successfully prepared a wet discoloring fabric based on pH indicators (High humidity-sensitive discoloration materials fabricated with pH indicator ingredients, Dyes and Pigments, 2021, 195, 109740), which is prepared by screen printing method using silica gel and hydrophilic silica aerogel as the hygroscopic material, methyl red or thymol blue (pH indicator) as the discoloring component, boric acid as the acid-base adjusting component. The discoloring fabric has good flexibility and good mechanical properties, fast response to humidity, obvious color change, stable color transition, etc. However, considering the characteristics of screen printing, this wet discoloring fabric has the following defects: the pH indicator and boric acid may leak during use (especially after direct contact with liquid water), and the wear resistance, washability and air permeability need to be improved. SUMMARY

[0005] To solve the above technical problems, the primary object of the present application is to provide a preparation method of a wet-induced color-changing fabric, which prepares a wet-induced color-changing fabric based on humidity-induced pH indicator color change by grafting polymerization of hydrophilic monomers and reactive pH indicators on the surface of the fabric.

[0006] A further object of the present application is to provide a wet-induced color-changing fabric prepared by the above method, which exhibits reversible color change from blue to yellow after the relative humidity increases, has high reusability, good flexibility, strong moisture absorption, reversible color change with humidity change, good durability and air permeability, and the like.

[0007] A third object of the present application is to provide an application of the above wet-induced color-changing fabric in humidity indication, pH detection, humidity management and evaporative cooling.

[0008] The above objects of the present application are achieved by the following technical solutions:

[0009] The first aspect of the present application provides a preparation method of a wet-induced color-changing fabric, comprising the following steps:

[0010] S1. Adding a reaction reagent to a pH indicator solution to prepare a reactive pH indicator by reaction; the reaction reagent is an acyl halide, an acid anhydride or an isocyanate compound;

[0011] S2. Dissolving the above reactive pH indicator, hydrophilic monomer, crosslinking agent and photoinitiator in a solvent to obtain a finishing liquid, and padding the finishing liquid on the fabric to obtain the wet-induced color-changing fabric through photopolymerization and ion exchange reaction; the hydrophilic monomer is an ammonium salt monomer.

[0012] The present application initiates free radical graft polymerization by ultraviolet light and photoinitiator, causes graft polymerization between the reactive pH indicator, hydrophilic monomer, crosslinking agent and the side groups of the fabric fibers, forms covalent connection, so that the pH indicator and the moisture absorption material do not peel off and leak in use, and the fabric has high wear resistance and washing resistance; the flexibility and morphology diversity of the fabric are well maintained, and the fabric still has good air permeability; the moisture absorption material can efficiently enhance the ability of the fabric to absorb water vapor from the air, ion exchange replaces the chloride ion on the hydrophilic monomer quaternary ammonium salt with acetate ion to enhance the moisture absorption, and the change of the quaternary ammonium salt group also changes the color change behavior of the fabric; the polymer network formed by polymerization endows the fabric with reversible wet-induced color-changing ability; the fabric still has similar color change behavior as the original after being washed for many times, and has good washing resistance.

[0013] Specifically, when the reaction reagent is an acyl halide or an anhydride compound, an acid binding agent is added to absorb the acid generated in the reaction to facilitate the smooth progress of the reaction in step S1. The acid binding agent is triethylamine, pyridine or N,N-diisopropylethylamine.

[0014] In consideration of the convenience of purification, the reaction reagent is preferably an isocyanate compound.

[0015] Further, the reaction reagent is acryloyl halide, methacryloyl halide, acrylic anhydride, methacrylic anhydride, isocyanate acrylate or isocyanate methacrylate in step S1.

[0016] Specifically, the pH indicator solution comprises a pH indicator and a solvent, and the solvent is one or more of dichloromethane, trichloromethane, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide and tetrahydrofuran in step S1.

[0017] Further, the pH indicator is one or more of thymol blue, bromophenol blue, bromochlorophenol green, chlorophenol red, bromochlorophenol purple, phenol red, cresol red, bromothymol blue, phenolphthalein, 1-naphtholphthalein and thymolphthalein in step S1.

[0018] Preferably, the molar ratio of the reaction reagent to the pH indicator is (1-2):1 in step S1.

[0019] Preferably, the reaction time is greater than 5 hours in step S1.

[0020] Further, the hydrophilic monomer is one or more of allyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyldimethylbenzylammonium chloride, methacryloyloxyethyldimethylbenzylammonium chloride, dimethyldiallylammonium chloride, (3-acrylamidopropyl)trimethylammonium chloride, allyltrimethylammonium bromide and bromomethallyldimethylammonium bromide in step S2.

[0021] Further, the crosslinking agent is one or more of N,N-methylenebisacrylamide, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate in step S2.

[0022] Further, in step S2, the photoinitiator is one or more of photoinitiator 1173, photoinitiator 2959, photoinitiator 127, photoinitiator 184, photoinitiator 369, photoinitiator 379, photoinitiator 907, photoinitiator 1110, photoinitiator 1101, photoinitiator 1220, photoinitiator 1046, photoinitiator 1156, photoinitiator 651, photoinitiator 754, photoinitiator 819, photoinitiator EHA, photoinitiator MBP, photoinitiator MBF, photoinitiator OMBB, photoinitiator PBZ, photoinitiator TPO, photoinitiator TPO-L, photoinitiator BDK, photoinitiator BP, photoinitiator 1000, photoinitiator 4265, photoinitiator 500, and photoinitiator DETX.

[0023] Further, in step S2, the solvent is one or more of water, N,N-dimethylformamide, N,N-dimethylacetamide, methanol, ethanol, and acetone.

[0024] Further, in step S2, the fabric is cotton, hemp, silk, wool, polyester, nylon, spandex, vinylon, acrylic, polypropylene, chlorofiber, aramid, regenerated cellulose, regenerated protein fiber fabric, or a blended fabric thereof.

[0025] Further, in step S2, the mass ratio of the reactive pH indicator, the hydrophilic monomer, the crosslinking agent, the photoinitiator, and the solvent is (0.1-0.5):(4-8):0.4:0.1:(1.4-5.4).

[0026] Further, in step S2, the ion-exchanged aqueous solution is one or more of an acetate, an oxalate, a sulfate, a nitrate, a carbonate, and a bicarbonate.

[0027] Preferably, in step S2, the immersion time for each ion exchange is greater than 6 hours, and the number of immersions is greater than 2.

[0028] The second aspect of the present application provides a wet-induced color-changing fabric prepared by the method of the first aspect. The wet-induced color-changing fabric has strong moisture absorption and air permeability. The color of the fabric changes obviously and reversibly with the change of environmental humidity. The fabric has a pH indicating function, and its color changes obviously with pH. The fabric has an evaporation cooling function. The fabric has excellent wear resistance and washing resistance, and no obvious color loss occurs after friction and washing. The fabric has high repeatability, good flexibility, strong moisture absorption, reversible color change with humidity, good durability, and good air permeability.

[0029] The third aspect of the present application provides the use of the wet-induced color-changing fabric of the second aspect in humidity indication, pH detection, humidity management, and evaporation cooling.

[0030] The beneficial effects of the present application are:

[0031] 1. The present application initiates free radical graft polymerization by ultraviolet light and photoinitiator, so that the reactive pH indicator, hydrophilic monomer, crosslinking agent and the side groups of the fabric fiber are grafted and polymerized to form covalent bonds, so that the pH indicator and the moisture absorption material will not be peeled off and leaked in use; the moisture absorption material can efficiently enhance the ability of the fabric to absorb water vapor from the air, the ion exchange replaces the chloride ion on the hydrophilic monomer quaternary ammonium salt with acetate ion, enhances the moisture absorption, and the change of the quaternary ammonium salt group also changes the color change behavior of the fabric; the polymer network formed by polymerization endows the fabric with reversible moisture-induced color change ability.

[0032] 2. The moisture-induced color-changing fabric provided by the present application has strong moisture absorption and air permeability; the color of the fabric can change obviously and reversibly with the change of environmental humidity; the fabric has pH indicating function, and its color can change obviously with pH; the fabric has evaporation cooling function; the fabric has excellent wear resistance and washing resistance, and no obvious color shedding occurs after friction and washing, and has the advantages of high repeatability, good flexibility, strong moisture absorption, reversible color change with humidity, good durability and air permeability. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a real picture of the moisture-induced color-changing fabric prepared in Example 1.

[0034] Figure 2 It is an optical microscope photo of the cotton fabric and the moisture-induced color-changing fabric prepared in Example 1.

[0035] Figure 3 It is a scanning electron microscope photo of the cotton fabric and the moisture-induced color-changing fabrics prepared in Examples 1-3.

[0036] Figure 4 It is a comparison diagram of moisture absorption rates of the cotton fabric, the moisture-induced color-changing fabrics prepared in Examples 1-3 and the moisture-induced color-changing fabric prepared in Comparative Example 2 under different humidities.

[0037] Figure 5 It is a reflectivity curve diagram of the moisture-induced color-changing fabric prepared in Example 1 under different humidities.

[0038] Figure 6 It is a data diagram of a* and b* values of the moisture-induced color-changing fabric prepared in Example 1 under different humidities.

[0039] Figure 7 It is a data diagram of K / S values of the moisture-induced color-changing fabrics prepared in Examples 1, 4 and 5 in dry state.

[0040] Figure 8 is a graph of the air permeability data of the cotton fabric and the wet-achromic fabric prepared in Example 1-3 in dry state.

[0041] Figure 9 is a graph of the temperature change of the cotton fabric and the wet-achromic fabric prepared in Example 3 when heated at 50°C. DETAILED DESCRIPTION

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] The present application is further described so that others skilled in the art can better understand the present application and make and use it, although modifications will be obvious to those skilled in the art, and the forward examples are not intended to limit the present application.

[0044] The experimental methods used in the following examples are routine methods unless otherwise specified, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0045] Example 1

[0046] A method for preparing a wet-achromic fabric, comprising the following steps:

[0047] S1. Dissolve 0.624 g of bromothymol blue in 20 mL of tetrahydrofuran solution, then add 0.212 g of isocyanate acrylate to react, to prepare a reactive pH indicator;

[0048] S2. Dissolve 0.1 g of the reactive pH indicator in 3.4 g of N,N-dimethylacetamide, then add 6.0 g of an 80 wt.% aqueous solution of acryloyloxyethyl trimethylammonium chloride, 0.4 g of polyethylene glycol diacrylate, and 0.1 g of a photoinitiator 1173, and stir to obtain a finishing liquid. Dip 1 g of cotton fabric in 10 g of the finishing liquid, take it out, and irradiate it with ultraviolet light (365 nm, 100 W / m 2 ) for 10 minutes. Dip the fabric in a 5 wt.% sodium acetate solution for ion exchange, exchange 3 times, 6 hours each time, wash and dry to obtain a wet-achromic fabric (Sample 1).

[0049] Example 2

[0050] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the amount of the aqueous solution of acryloyloxyethyl trimethyl ammonium chloride is 4.0 g, and the amount of N,N-dimethylacetamide is 5.4 g, to obtain a wet-achromic fabric (Sample 2).

[0051] Example 3

[0052] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the amount of the aqueous solution of acryloyloxyethyl trimethyl ammonium chloride is 8.0 g, and the amount of N,N-dimethylacetamide is 1.4 g, to obtain a wet-achromic fabric (Sample 3).

[0053] Example 4

[0054] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the amount of the reactive pH indicator is 0.3 g, and the amount of N,N-dimethylacetamide is 3.2 g, to obtain a wet-achromic fabric (Sample 4).

[0055] Example 5

[0056] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the amount of the reactive pH indicator is 0.5 g, and the amount of N,N-dimethylacetamide is 3.0 g, to obtain a wet-achromic fabric (Sample 5).

[0057] Example 6

[0058] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that step S1 is changed to: 0.624 g of bromothymol blue is dissolved in 20 mL of tetrahydrofuran solution, and then 0.141 g of isocyanate acrylate is added to react, to prepare a reactive pH indicator.

[0059] Example 7

[0060] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that step S1 is changed to: 0.624 g of bromothymol blue is dissolved in 20 mL of tetrahydrofuran solution, and then 0.156 g of methacryloyl chloride and 0.2 mL of triethylamine are added to react, to prepare a reactive pH indicator.

[0061] Example 8

[0062] A preparation method of a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the hydrophilic monomer is replaced by allyl trimethyl ammonium chloride.

[0063] Example 9

[0064] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the hydrophilic monomer is replaced by dimethyldiallylammonium chloride.

[0065] Example 10

[0066] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the crosslinking agent is replaced by N,N-methylenebisacrylamide.

[0067] Example 11

[0068] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the initiator is replaced by photoinitiator 2959.

[0069] Example 12

[0070] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the solvent is replaced by ethanol.

[0071] Example 13

[0072] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the fabric used is a polyester fabric.

[0073] Example 14

[0074] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the fabric used is a nylon fabric.

[0075] The wet-achromic polyester fabrics prepared in Examples 6-14 have similar color-changing behavior to that of Example 1.

[0076] Comparative Example 1

[0077] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the reactive pH indicator is replaced by a commercially available pH indicator without any treatment.

[0078] The wet-achromic fabric prepared in Comparative Example 1 has similar color-changing behavior to that of Example 1, but the pH indicator is easy to fall off after washing, and the fastness is poor.

[0079] Comparative Example 2

[0080] A method for preparing a wet-achromic fabric, which is the same as the preparation method of Example 1, except that the ion exchange operation is not performed, obtaining a wet-achromic fabric (Sample 6).

[0081] Comparative Example 3

[0082] A preparation method of the wet-induced color-changing fabric is the same as that of Example 1, except that the hydrophilic monomer is replaced by acrylamide.

[0083] The wet-induced color-changing fabric prepared in Comparative Example 3 does not have the wet-induced color-changing ability.

[0084] Figure 1 is a real photo of the wet-induced color-changing fabric prepared in Example 1, from which it can be seen that the wet-induced color-changing fabric provided by the application has good flexibility and can be bent and folded.

[0085] Figure 2 is an optical microscope photo of the cotton fabric and the wet-induced color-changing fabric prepared in Example 1, from which it can be seen that the wet-induced color-changing fabric retains the original structure of the fabric, because the polymerization reaction occurs on the fiber and does not block the gap between the yarns.

[0086] Figure 3 is a scanning electron microscope photo of the cotton fabric and the wet-induced color-changing fabrics prepared in Examples 1-3, from which it can be seen that, compared with the original cotton fabric, the wet-induced color-changing fabric has a rough layer on the surface, and from Sample 2 to Sample 1 and then to Sample 3, the rough layer becomes more and more obvious, indicating that the increase of the amount of the hydrophilic monomer will form more polymers on the surface of the fabric.

[0087] Figure 4 is a comparison chart of the moisture absorption rates of the cotton fabric, the wet-induced color-changing fabrics prepared in Examples 1-3 and the wet-induced color-changing fabric prepared in Comparative Example 2 under different humidity, from which it can be seen that the moisture absorption of Sample 2 is lower than that of Sample 1, and the moisture absorption of Sample 3 is higher than that of Sample 1, because from Sample 2 to Sample 1 and then to Sample 3, the amount of the moisture-absorbing polymer on the fabric gradually increases, and the moisture-absorbing polymer can efficiently enhance the ability of the fabric to absorb water vapor from the air, and more moisture-absorbing polymer makes the fabric have stronger moisture absorption. By comparing Sample 1 and Sample 6, the moisture absorption of Sample 6 is reduced, the color-changing time is greatly prolonged, and the color change is not obvious, because the ammonium acetate group after ion exchange has stronger moisture absorption than the ammonium chloride group, and the change of the group also affects the color-changing performance of the fabric.

[0088] Figure 5 is a reflectivity curve chart of the wet-induced color-changing fabric prepared in Example 1 under different humidity, Figure 6 is a data chart of the a* and b* values of the wet-induced color-changing fabric prepared in Example 1 under different humidity, in the Lab color space, the a* value is the red-green axis, and the positive and negative values represent red and green, respectively; the b* value represents the yellow-blue axis, and the positive and negative values represent yellow and blue, respectively, Figure 5 and Figure 6 prove that the polymer network formed by the polymerization of the application endows the fabric with reversible wet-induced color-changing ability.

[0089] Figure 7 is a graph of K / S values of the wet-thermo-chromic fabrics prepared in Examples 1, 4 and 5 in dry state, K / S value represents the degree of color depth of the surface, the greater the value, the deeper the color, as can be seen from the graph, samples 4 and 5 have deeper color than sample 1, and the increase of the amount of reactive pH indicator will deepen the color of the fabric.

[0090] Figure 8 is a graph of air permeability of the cotton fabric and the wet-thermo-chromic fabrics prepared in Examples 1-3 in dry state, as can be seen from the graph, the wet-thermo-chromic fabrics have similar air permeability to the cotton fabric, thus the wet-thermo-chromic fabric prepared in the present application still has good air permeability.

[0091] Application Example 1 Humidity Indication

[0092] The color of the wet-thermo-chromic fabric prepared in Example 1 under different humidity was determined, and the test results are shown in Figure 6 and 7 . Figure 6 The reflectance curves of sample 1 under 0%, 33%, 59%, 85% and 98% RH are shown. With the increase of humidity, the reflectance peaks of sample 1 appear at 485 nm, 500 nm, 525 nm, 540 nm and 565 nm, respectively. In combination with Figure 7 , the a* values of sample 4 under 0%, 33%, 59%, 85% and 98% RH are -15.0, -13.4, -12.0, -7.4, 3.4, respectively, and the b* values are -8.1, 6.7, 16.6, 22.7, 35.4, respectively. These results all show that the wet-thermo-chromic fabric undergoes a color transition from blue to yellow with the increase of relative humidity.

[0093] The wet-thermo-chromic fabric of the present application can undergo obvious reversible color change with the change of environmental humidity, that is, it presents a transition from blue to yellow with the increase of relative humidity, and presents a transition from yellow to blue with the decrease of relative humidity, and thus can be used for humidity indication.

[0094] Application Example 2 pH Detection

[0095] The wet-thermo-chromic fabric of the present application has pH indication function, and presents yellow in an acidic solution with pH≤6, presents yellow-green in a neutral solution with pH=7, presents green in an alkaline solution with pH=8, and presents blue in an alkaline solution with pH≥9, thus distinguishing the acidic, neutral and alkaline solutions with the above corresponding pH values. In addition, it can also be used for monitoring the leakage of acid-base gas.

[0096] Application Example 3 Humidity Management

[0097] The wet-achromic fabric of the present application has strong moisture absorption, such as Figure 5 As shown in the figure, the wet-achromic fabric prepared in Example 1 has a moisture absorption rate of up to 45% at 98% RH, and can be used for humidity management.

[0098] Application Example 4: Evaporative cooling

[0099] After the wet-achromic fabric of the present application is fully absorbed in an 85% RH environment, it can be placed on a heating plate at 50°C to achieve a cooling effect of about 1-2°C compared to pure cotton fabric, such as Figure 9 Figure 9 is a temperature change graph of cotton fabric and the wet-achromic fabric prepared in Example 3 when heated at 50°C, proving that the wet-achromic fabric of the present application can be used for evaporative cooling.

[0100] The above examples are only preferred examples for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or transformation made by those skilled in the art based on the present application is within the protection scope of the present application. The protection scope of the present application is subject to the claims.​

Claims

1. A process for the preparation of a wet-achromic fabric, characterized in that, Comprising the following steps: S1. adding a reaction reagent to a pH indicator solution to prepare a reactive pH indicator by reaction; the reaction reagent is acryloyl halide, methacryloyl halide, acrylic anhydride, methacrylic anhydride, isocyanate acrylate or isocyanate methacrylate; S2. dissolving the above-mentioned reactive pH indicator, hydrophilic monomer, crosslinking agent and photoinitiator in a solvent to obtain a finishing liquid, padding the finishing liquid on a fabric, and obtaining the wet-thermo-chromic fabric by photopolymerization and ion exchange reaction; the hydrophilic monomer is one or more of allyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyldimethylbenzylammonium chloride, methacryloyloxyethyldimethylbenzylammonium chloride, dimethyldiallylammonium chloride, (3-acrylamidopropyl)trimethylammonium chloride, allyltrimethylammonium bromide and bromomethylvinyl dimethylammonium bromide; the ion exchange aqueous solution is one or more of acetate, oxalate, sulfate, nitrate, carbonate and bicarbonate.

2. The production method according to claim 1, characterized by, In step S1, the pH indicator is one or more of thymol blue, bromophenol blue, bromochlorophenol blue, chlorophenol red, bromochlorophenol purple, phenol red, cresol red, bromothymol blue, phenolphthalein, 1-naphtholphthalein and thymolphthalein.

3. The production method according to claim 1, characterized by, In step S2, the crosslinking agent is one or more of N, N-methylenebisacrylamide, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.

4. The production method according to claim 1, characterized by, In step S2, the photoinitiator is one or more of photoinitiator 1173, photoinitiator 2959, photoinitiator 127, photoinitiator 184, photoinitiator 369, photoinitiator 379, photoinitiator 907, photoinitiator 1110, photoinitiator 1101, photoinitiator 1220, photoinitiator 1046, photoinitiator 1156, photoinitiator 651, photoinitiator 754, photoinitiator 819, photoinitiator EHA, photoinitiator MBP, photoinitiator MBF, photoinitiator OMBB, photoinitiator PBZ, photoinitiator TPO, photoinitiator TPO-L, photoinitiator BDK, photoinitiator BP, photoinitiator 1000, photoinitiator 4265, photoinitiator 500 and photoinitiator DETX.

5. The preparation method according to claim 1, characterized in that, In step S2, the fabric is cotton, hemp, silk, wool, polyester, nylon, spandex, vinylon, acrylic, polypropylene, chlorofiber, aramid, regenerated cellulose, regenerated protein fiber fabric or its blended fabric.

6. The method of claim 1, wherein, In step S2, the mass ratio of the reactive pH indicator, hydrophilic monomer, crosslinking agent, photoinitiator and solvent is (0.1~0.5):(4~8):0.4:0.1:(1.4~5.4).

7. A wet-thermo-chromic fabric prepared by the method of any one of claims 1~6.

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