A phase change microcapsule-mxene-modified polyacrylate fabric coating and a preparation method and application thereof

Abstract

The application discloses a kind of phase change microcapsule-MXene-modified polyacrylate fabric coating and its preparation method and application, belong to fabric coating technical field, including the following steps: MXene dispersion liquid and phosphocholine modified polyacrylate emulsion are mixed, then octadecane polystyrene-polyaniline microcapsule dispersion liquid is added, mixed uniformly, to obtain composite coating slurry;Composite coating slurry is deposited on the surface of fabric using vacuum filtration process, and is dried to obtain phase change microcapsule-MXene-modified polyacrylate fabric coating.The fabric coating preparation method provided by the application is simple and efficient, and the coated fabric is applied in the field of intelligent wearable devices, which can simultaneously realize the multiple responses of conductivity, humidity and thermal management function, and has wide application value.

Description

Technical Field

[0001] This invention belongs to the field of fabric coating technology, specifically relating to a phase change microcapsule-MXene-modified polyacrylate fabric coating, its preparation method, and its application. Background Technology

[0002] Octadecylane, as a typical organic phase change material, possesses high latent heat storage capacity and reversible solid-liquid phase change characteristics. Its fabrication into microcapsules and application in textile coatings can achieve thermal buffering and temperature regulation functions in fabrics. However, existing phase change microcapsules mostly employ single polymer or inorganic shell materials, generally suffering from insufficient thermal conductivity, slow thermal response rates, and limited stability under complex environments. Especially in humid and hot environments or during long-term use, microcapsules are prone to structural damage and core material leakage, making it difficult to meet the requirements of intelligent control materials for multifunctional coupling performance.

[0003] On the other hand, MXene, as a novel two-dimensional conductive material, possesses excellent electrical conductivity and surface functionalization capabilities, showing promising application prospects in sensing and conductive coating fields. However, existing MXene applications are mostly in the form of single coatings or simple composites, which are prone to aggregation in polymer systems, resulting in discontinuous conductive network construction and limiting performance stability and response sensitivity. Furthermore, MXene lacks a stable water molecule transport and storage medium during humidity response, making it difficult to fully utilize its interfacial conductivity advantages.

[0004] Regarding the polymer matrix, while traditional polyacrylates possess certain film-forming properties and flexibility, their hydrophilicity and moisture control capabilities are limited, making them prone to structural softening and performance degradation in high-humidity environments. Modified polyacrylates incorporating phosphocholine groups can significantly enhance the hydration capacity of materials, forming a stable water molecule network within the coating and providing favorable conditions for proton conduction and humidity response. However, when used alone, they lack conductive channels and functional carriers, making it difficult to achieve multifunctional synergy.

[0005] In the prior art, Chinese invention patent CN120365894A discloses a phase change microcapsule antibacterial material based on alkylated chitosan-polystyrene copolymer and its preparation method. By designing alkylated chitosan-polystyrene copolymer as the microcapsule wall material, alkylated chitosan is synthesized using an amino "protection-grafting-deprotection" strategy and used as both an emulsifier and wall material component. A composite microcapsule with alkylated chitosan-styrene grafted segments as the outer layer and polystyrene cross-linked segments as the inner layer is prepared by microemulsion interfacial polymerization. This allows the aliphatic hydrocarbon phase change material to be stably encapsulated within the microcapsule, achieving a multifunctional integration of thermal management, antibacterial function, and microcapsule shell stability. However, the prepared microcapsules are single-shell structures with insufficient conductivity and limited response performance to environmental humidity. The microcapsule shell does not incorporate conductive or humidity-sensitive functional units, which limits its performance in humid and hot environments and intelligent response applications. Furthermore, Chinese invention patent CN119332535A discloses a method for using MXene materials in paper-based sensors. This method obtains an MXene aqueous dispersion by etching MAX powder and directly coats it onto a paper substrate to achieve conductivity and sensing functions. However, the conductive path of a single layer of MXene on the paper substrate is easily affected by uncontrollable microcracks, resulting in limited conductivity and sensing sensitivity. Additionally, MXene tends to agglomerate when applied in multilayer coatings or over large areas, restricting the stability and reusability of the paper-based sensor. While existing technologies have achieved some success in single thermal management or electrical modification, they still have significant shortcomings in achieving the synergistic integration of phase change material thermal response, microcapsule conductivity and humidity sensitivity with functional coatings. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a phase change microcapsule-MXene-modified polyacrylate fabric coating, its preparation method, and its application. This invention combines octadecane@polystyrene-polyaniline microcapsules, MXene, and modified polyacrylate, and constructs a multifunctional coating on the fabric surface through a vacuum filtration process. This enables the fabric to achieve multifunctional responsiveness in the field of smart wearables and has high application value.

[0007] This invention provides the following technical solution: In a first aspect, a method for preparing a phase change microcapsule-MXene-modified polyacrylate fabric coating is provided, comprising the following steps: MXene dispersion and phosphocholine-modified polyacrylate emulsion were mixed, followed by the addition of octadecane@polystyrene-polyaniline microcapsule dispersion, and the mixture was stirred evenly to obtain a composite coating slurry. The composite coating slurry was deposited on the fabric surface using a vacuum filtration process and then dried to obtain a phase change microcapsule-MXene-modified polyacrylate fabric coating.

[0008] Furthermore, the mass ratio of the MXene dispersion, the phosphocholine-modified polyacrylate emulsion, and the octadecane@polystyrene-polyaniline microcapsule dispersion is 0.05~0.2:1~2.5:0.1~0.35.

[0009] Furthermore, the octadecane@polystyrene-polyaniline microcapsule dispersion contains octadecane@polystyrene-polyaniline microcapsules composed of a core material and a wall material. The core material is octadecane, the inner side of the wall material is a polystyrene layer, and the outer side of the wall material is a polyaniline layer.

[0010] Furthermore, in the choline-modified polyacrylate emulsion, choline sulfate is located on the side chain of the polyacrylate.

[0011] Furthermore, the preparation method of the octadecane@polystyrene-polyaniline microcapsule dispersion includes the following steps: Polyvinyl alcohol is dissolved in water and mixed evenly to form an aqueous phase. Styrene, octadecane, azobisisobutyronitrile and divinylbenzene are mixed evenly to form an oil phase. The oil phase is added to the aqueous phase and stirred at a stirring speed of 8000~12000 rpm for 3~5 minutes until homogeneous to obtain an emulsion. The emulsion was heated to 75-80℃ and reacted for 8-10 h, followed by centrifugation, washing and vacuum drying to obtain octadecane@polystyrene microcapsules; Octadecylene@polystyrene microcapsules were dispersed in a 0.1M acid solution, polyvinylpyrrolidone was added and dispersed evenly, aniline was added, and the mixture was stirred at 8000~12000 rpm for 3~5 min under ice bath conditions until homogeneous. Then the first initiator was added dropwise to react. After the reaction was completed, an octadecylene@polystyrene-polyaniline microcapsule dispersion was obtained.

[0012] Furthermore, the mass ratio of the polyvinyl alcohol, the styrene, the octadecane, the azobisisobutyronitrile, and the divinylbenzene is 0.8~1.6:2.5~4:2.5~4:0.15~0.35:0.25~0.4.

[0013] Furthermore, the mass ratio of the octadecane@polystyrene microcapsules, the polyvinylpyrrolidone, the aniline, and the first initiator is 0.2~0.35:0.8~1.2:0.08~0.15:0.2~0.3.

[0014] Furthermore, the mass ratio of the octadecane@polystyrene microcapsules to the acid solution is 0.15~0.25:50~150.

[0015] Furthermore, the first initiator includes any one of ammonium persulfate, potassium persulfate, or sodium persulfate.

[0016] Furthermore, the acid solution includes any one of hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, or acetic acid.

[0017] Furthermore, the preparation method of the phosphoric acid choline modified polyacrylate emulsion includes the following steps: Nonionic emulsifier, ionic emulsifier, butyl acrylate and methyl methacrylate are added to deionized water and stirred at 8000~12000 rpm for 3~5 min to homogenize and emulsify. Then, methacryloyloxyethyl phosphocholine is added and mixed evenly to obtain a pre-emulsion. The second initiator was added to an aqueous solution of sodium bicarbonate and heated. The pre-emulsion was added dropwise, heated to 75-80°C and reacted. The pH was adjusted to neutral to obtain a phosphocholine-modified polyacrylate emulsion.

[0018] Furthermore, the mass ratio of the nonionic emulsifier, the butyl acrylate, the methyl methacrylate, the methacryloyloxyethyl phosphocholine, the second initiator, and the sodium bicarbonate is 0.6~1.5:15~25:6~12:0.6~1.5:0.12~0.22:0.06~0.15.

[0019] Furthermore, the mass ratio of the ionic emulsifier to the deionized water is 0.5~1.5:60~100.

[0020] Furthermore, the nonionic emulsifier includes any one or more of polyoxyethylene-8-octylphenyl ether, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monolaurate, or sorbitan fatty acid ester.

[0021] Furthermore, the ionic emulsifier includes any one or more of sodium dodecyl sulfate or sodium dodecylbenzene sulfonate.

[0022] Furthermore, the second initiator includes any one of potassium persulfate, ammonium persulfate, or sodium persulfate.

[0023] In a second aspect, a phase change microcapsule-MXene-modified polyacrylate fabric coating is provided, which is prepared according to the preparation method of the phase change microcapsule-MXene-modified polyacrylate fabric coating according to any one of the first aspects.

[0024] Thirdly, the application of the phase change microcapsule-MXene-modified polyacrylate fabric coating described in the second aspect in the field of smart wearables is provided.

[0025] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a phase change microcapsule-MXene-modified polyacrylate fabric coating. The phase change microcapsules use octadecane as the core material and polystyrene-polyaniline as the conductive double-shell structure, forming an octadecane@polystyrene-polyaniline phase change microcapsule. This structure not only has a high specific surface area, providing abundant water molecule adsorption sites, but its polyaniline shell also serves as a highly efficient Grotthuss proton conduction channel, promoting proton migration and thus enhancing the system's humidity response. The phosphocholine-modified polyacrylate, by introducing phosphocholine groups into the molecular side chains, forms a stable hydration structure within the coating, providing a continuous medium for the adsorption, storage, and migration of water molecules, thereby enhancing the stability and sustainability of the humidity response. MXene constructs a conductive network within the coating, providing a pathway for electrical signal transmission and improving the material's conductivity and signal output capability. Through the synergistic effect of these three components, the phase change microcapsules provide thermal response and a functional carrier, MXene constructs a highly efficient conductive pathway, and phosphocholine-modified polyacrylate provides a water molecule transport and storage environment, thus enabling the fabric coating to simultaneously possess multiple functions including thermal response, conductivity, and humidity response. Based on the high hydrophilicity of the phosphocholine group and the high specific surface area of ​​the double-shell microcapsule structure, this fabric coating exhibits excellent adsorption and transport capabilities for water molecules, with a humidity sensitivity of up to 22150%. In practical applications, this functional fabric can achieve real-time monitoring of ambient humidity and, combined with the reversible heat absorption and release process of phase change materials, realize dynamic thermal regulation, thereby enhancing the fabric's performance in the field of smart wearables. Attached Figure Description

[0026] Figure 1 This is a synthetic route diagram of the polyaniline shell of the octadecane@polystyrene-polyaniline microcapsules in this invention; Figure 2 This is a synthetic route diagram for the phosphoric acid choline-modified polyacrylate in this invention; Figure 3 The images shown are test images of the phase change microcapsules in Example 1 of the present invention; wherein, (a) is a cold field emission scanning electron microscope image of octadecane@polystyrene microcapsules; (bd) are cold field emission scanning electron microscope images of octadecane@polystyrene-polyaniline microcapsules at different magnifications; (e) is the EDS energy spectrum of octadecane@polystyrene-polyaniline microcapsules; (f) is the elemental distribution spectrum of octadecane@polystyrene-polyaniline microcapsules; (gh) is the transmission electron microscope image of octadecane@polystyrene-polyaniline microcapsules; and (i) is the infrared spectrum of octadecane@polystyrene-polyaniline microcapsules. Figure 4The differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results of the phase change microcapsules in Example 1 of this invention are shown below; (a) represents octadecane; (b) represents octadecane@polystyrene microcapsules; (c) represents octadecane@polystyrene-polyaniline microcapsules; (d) is a comparison chart of the encapsulation parameters of octadecane@polystyrene microcapsules and octadecane@polystyrene-polyaniline microcapsules; (e) is the cyclic DSC curve of octadecane@polystyrene-polyaniline microcapsules; and (f) is the phase change temperature and phase change enthalpy change curve of octadecane@polystyrene-polyaniline microcapsules. Figure 5 The images show the test results of the coated fabric and the original polyester fabric in Example 1 of the present invention; wherein, (a) is the infrared spectrum of the phosphocholine modified polyacrylate of Example 1; (b) is the surface morphology of the original polyester fabric; (c) is the surface morphology of the coated fabric of Example 1; (d) is the EDS energy spectrum and elemental distribution spectrum of the coated fabric of Example 1; and (e) is a magnified SEM image of a portion of the coated fabric of Example 1. Figure 6 The following are humidity response test diagrams of the coated fabrics in Examples 1, 6-8 and Comparative Example 3 of the present invention; wherein, (a) is the humidity response characteristic curve of the coated fabrics with different microcapsule contents; (b) is the corresponding resistance change diagram; (c) is the microstructure diagram of Example 8; and (dh) is the dynamic response and cycle stability test results of Example 1. Figure 7 The following are temperature test images of the coated fabric and the original polyester fabric in Embodiment 1 of the present invention; wherein, (a) is the heating curve; (b) is the cooling curve; and (c) is the infrared thermal image. Figure 8 The images show the wearability performance of the coated fabric and the original polyester fabric under human movement conditions in Example 1 of the present invention; wherein, (a) is the humidity and temperature signal change curve of Example 1; and (b) is an infrared thermal image. Figure 9 The temperature change curves of the coated fabric and the original polyester fabric under human movement conditions in Embodiment 1 of the present invention are shown. Figure 10 This is a schematic diagram of the phase change microcapsule-MXene-phosphocholine modified polyacrylate coated fabric structure of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0028] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "comprising," "including," "having," "containing," etc., as used herein are open-ended, meaning they include but are not limited to.

[0029] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0030] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0031] In the description of this invention, it should be understood that the parts in the embodiments of this invention specifically refer to the solid content, and the MXene used in the embodiments of this invention is titanium-based MXene. In some possible embodiments, the fabric includes polyester, nylon, polypropylene or other textiles. In this invention, the fabric used in the examples and comparative examples is polyester fabric.

[0032] Unless otherwise specified, all raw materials used in the embodiments of this invention are commercially available, as shown in Table 1.

[0033] Table 1 Basic Information of Raw Materials

[0034] Example 1

[0035] (1) One part of polyvinyl alcohol was completely dissolved in 100 parts of deionized water at 80°C to prepare an aqueous phase for later use. Three parts of styrene, three parts of octadecane (OD), 0.15 parts of azobisisobutyronitrile, and 0.3 parts of divinylbenzene were mixed and ultrasonically treated to form a homogeneous oil phase. The oil phase was mixed with the aqueous phase and homogenized at 10,000 rpm for 3 min to obtain a milky white emulsion. The emulsion was transferred to a three-necked flask and stirred continuously at 75°C for 10 h. After the reaction was completed, the microcapsules were obtained by centrifugation, washing, and vacuum drying, denoted as OD@PS.

[0036] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.2 parts of the sample were dispersed in 100 parts of 0.1 M hydrochloric acid solution, and 1 part of polyvinylpyrrolidone was added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.1 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.25 parts of ammonium persulfate solution dissolved in a small amount of water was slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and finally, an octadecane@polystyrene-polyaniline microcapsule (denoted as OD@PS-PANI) dispersion was obtained.

[0037] (3) First, pre-emulsification was performed. 1 part fatty alcohol polyoxyethylene ether, 0.8 parts sodium dodecyl sulfate, 20 parts butyl acrylate, and 9 parts methyl methacrylate were added to 22 parts deionized water and homogenized at high speed for 5 min. Then, 1 part methacryloyloxyethyl phosphocholine was added and mixed evenly to obtain a pre-emulsion for later use. Separately, 0.2 parts potassium persulfate was dissolved in 10 parts deionized water to prepare an initiator solution. In a three-necked flask containing 45 parts deionized water and 0.1 parts sodium bicarbonate, the temperature was raised to 75°C. Then, the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h) were added dropwise simultaneously. After the addition was complete, the temperature was raised to 80°C and the reaction continued for 2 h. After the reaction was completed, an appropriate amount of ammonia was added dropwise to adjust the pH of the system to neutral to enhance the storage stability of the emulsion, thus obtaining a phosphocholine-modified polyacrylate emulsion.

[0038] (4) Mix 0.1 parts of MXene dispersion with 2 parts of phosphocholine-modified polyacrylate emulsion, then add 0.21 parts of octadecane@polystyrene-polyaniline microcapsule dispersion, and sonicate to form a uniformly dispersed composite coating slurry. Subsequently, vacuum filtration is used to deposit the composite coating slurry onto the surface of polyester fabric, and after drying, a phase change microcapsule-MXene-modified polyacrylate fabric coating and the corresponding coated fabric are obtained.

[0039] In this embodiment, the content of phase change microcapsules is 9%.

[0040] Example 2

[0041] (1) 1.2 parts of polyvinyl alcohol were completely dissolved in 80 parts of deionized water at 80°C to prepare an aqueous phase for later use. 2.8 parts of styrene, 2.8 parts of octadecane, 0.18 parts of azobisisobutyronitrile, and 0.28 parts of divinylbenzene were mixed and ultrasonically treated to form a homogeneous oil phase. The oil phase was mixed with the aqueous phase and homogenized at 10,000 rpm for 3 min to obtain a milky white emulsion. The emulsion was transferred to a three-necked flask and stirred continuously at 75°C for 10 h. After the reaction was completed, the mixture was centrifuged, washed, and vacuum dried to obtain octadecane@polystyrene microcapsules.

[0042] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.25 parts of the sample were dispersed in 90 parts of 0.1 M hydrochloric acid solution, and 0.9 parts of polyvinylpyrrolidone were added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.12 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.22 parts of ammonium persulfate solution dissolved in a small amount of water were slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and the octadecane@polystyrene-polyaniline microcapsule dispersion was finally obtained.

[0043] (3) First, pre-emulsification was performed. 1.1 parts of fatty alcohol polyoxyethylene ether, 0.9 parts of sodium dodecyl sulfate, 18 parts of butyl acrylate, and 8 parts of methyl methacrylate were added to 18 parts of deionized water and homogenized at high speed for 5 min. Then, 1.2 parts of methacryloyloxyethyl phosphocholine were added and mixed evenly to obtain a pre-emulsion for later use. Separately, 0.15 parts of potassium persulfate were dissolved in 12 parts of deionized water to prepare an initiator solution. In a three-necked flask containing 40 parts of deionized water and 0.15 parts of sodium bicarbonate, the temperature was raised to 75°C. Then, the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h) were added dropwise simultaneously. After the addition was completed, the temperature was raised to 80°C and the reaction was continued for 2 h. After the reaction was completed, an appropriate amount of ammonia was added dropwise to adjust the pH of the system to neutral to enhance the storage stability of the emulsion, thus obtaining a phosphocholine-modified polyacrylate emulsion.

[0044] (4) Mix 0.12 parts of MXene dispersion with 1.7 parts of phosphocholine-modified polyacrylate emulsion, then add 0.2 parts of octadecane@polystyrene-polyaniline microcapsule dispersion, and sonicate to form a uniformly dispersed composite coating slurry. Subsequently, vacuum filtration is used to deposit the composite coating slurry onto the surface of polyester fabric, and after drying, a phase change microcapsule-MXene-modified polyacrylate fabric coating and the corresponding coated fabric are obtained.

[0045] Example 3

[0046] (1) First, 1.3 parts of polyvinyl alcohol were completely dissolved in 85 parts of deionized water at 80°C to prepare an aqueous phase for later use. Subsequently, 2.6 parts of styrene, 2.6 parts of octadecane, 0.16 parts of azobisisobutyronitrile, and 0.26 parts of divinylbenzene were mixed and ultrasonically treated to form a homogeneous oil phase. The oil phase was mixed with the aqueous phase and homogenized at 10,000 rpm for 3 min to obtain a milky white emulsion. The emulsion was transferred to a three-necked flask and stirred continuously at 75°C for 10 h. After the reaction was completed, the microcapsules were obtained by centrifugation, washing, and vacuum drying, yielding octadecane@polystyrene microcapsules.

[0047] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.24 parts of the sample were dispersed in 95 parts of 0.1 M hydrochloric acid solution, and 0.95 parts of polyvinylpyrrolidone were added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.08 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.26 parts of ammonium persulfate solution dissolved in a small amount of water were slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and the octadecane@polystyrene-polyaniline microcapsule dispersion was finally obtained.

[0048] (3) First, pre-emulsification was performed. 1.5 parts of fatty alcohol polyoxyethylene ether, 0.6 parts of sodium dodecyl sulfate, 15 parts of butyl acrylate, and 10 parts of methyl methacrylate were added to 15 parts of deionized water and homogenized at high speed for 5 min. Then, 1.3 parts of methacryloyloxyethyl phosphocholine were added and mixed evenly to obtain a pre-emulsion for later use. Separately, 0.16 parts of potassium persulfate were dissolved in 7 parts of deionized water to prepare an initiator solution. In a three-necked flask containing 42 parts of deionized water and 0.09 parts of sodium bicarbonate, the temperature was raised to 75°C. Then, the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h) were added dropwise simultaneously. After the addition was completed, the temperature was raised to 80°C and the reaction was continued for 2 h. After the reaction was completed, an appropriate amount of ammonia was added dropwise to adjust the pH of the system to neutral to enhance the storage stability of the emulsion, thus obtaining a phosphocholine-modified polyacrylate emulsion.

[0049] (4) Mix 0.15 parts of MXene dispersion with 2.4 parts of phosphocholine-modified polyacrylate emulsion, then add 0.3 parts of octadecane@polystyrene-polyaniline microcapsule dispersion, and sonicate to form a uniformly dispersed composite coating slurry. Then, use a vacuum filtration process to deposit the above slurry onto the surface of polyester fabric, and after drying, obtain a phase change microcapsule-MXene-modified polyacrylate fabric coating and the corresponding coated fabric.

[0050] Example 4

[0051] (1) 0.9 parts of polyvinyl alcohol were completely dissolved in 75 parts of deionized water at 80°C to prepare an aqueous phase for later use. Subsequently, 3.2 parts of styrene, 3.2 parts of octadecane, 0.3 parts of azobisisobutyronitrile, and 0.32 parts of divinylbenzene were mixed and ultrasonically treated to form a homogeneous oil phase. The oil phase was mixed with the aqueous phase and homogenized at 10,000 rpm for 3 min to obtain a milky white emulsion. The emulsion was transferred to a three-necked flask and stirred continuously at 75°C for 10 h. After the reaction was completed, the microcapsules were obtained by centrifugation, washing, and vacuum drying, yielding octadecane@polystyrene microcapsules.

[0052] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.31 parts of the sample were dispersed in 92 parts of 0.1 M hydrochloric acid solution, and 0.92 parts of polyvinylpyrrolidone were added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.14 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.21 parts of ammonium persulfate solution dissolved in a small amount of water were slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and the octadecane@polystyrene-polyaniline microcapsule dispersion was finally obtained.

[0053] (3) First, pre-emulsification was performed. 1.4 parts of fatty alcohol polyoxyethylene ether, 0.7 parts of sodium dodecyl sulfate, 21 parts of butyl acrylate, and 7 parts of methyl methacrylate were added to 17 parts of deionized water and homogenized at high speed for 5 min. Then, 1.4 parts of methacryloyloxyethyl phosphocholine were added and mixed evenly to obtain a pre-emulsion for later use. Separately, 0.18 parts of potassium persulfate were dissolved in 15 parts of deionized water to prepare an initiator solution. In a three-necked flask containing 46 parts of deionized water and 0.12 parts of sodium bicarbonate, the temperature was raised to 75°C. Then, the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h) were added dropwise simultaneously. After the addition was completed, the temperature was raised to 80°C and the reaction was continued for 2 h. After the reaction was completed, an appropriate amount of ammonia was added dropwise to adjust the pH of the system to neutral to enhance the storage stability of the emulsion, thus obtaining a phosphocholine-modified polyacrylate emulsion.

[0054] (4) Mix 0.08 parts of MXene dispersion with 2.2 parts of phosphocholine-modified polyacrylate emulsion, then add 0.25 parts of octadecane@polystyrene-polyaniline microcapsule dispersion, and sonicate to form a uniformly dispersed composite coating slurry. Subsequently, the above slurry is deposited on the surface of polyester fabric using a vacuum filtration process, and after drying, a phase change microcapsule-MXene-modified polyacrylate fabric coating and the corresponding coated fabric are obtained.

[0055] Example 5

[0056] (1) 1.5 parts of polyvinyl alcohol were completely dissolved in 110 parts of deionized water at 80°C to prepare an aqueous phase for later use. 3.5 parts of styrene, 3.5 parts of octadecane, 0.33 parts of azobisisobutyronitrile, and 0.35 parts of divinylbenzene were mixed and ultrasonically treated to form a homogeneous oil phase. The oil phase was mixed with the aqueous phase and homogenized at 10,000 rpm for 3 min to obtain a milky white emulsion. The emulsion was transferred to a three-necked flask and stirred continuously at 75°C for 10 h. After the reaction was completed, the mixture was centrifuged, washed, and vacuum dried to obtain octadecane@polystyrene microcapsules.

[0057] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.3 parts of the sample were dispersed in 110 parts of 0.1 M hydrochloric acid solution, and 1.1 parts of polyvinylpyrrolidone were added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.13 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.28 parts of ammonium persulfate solution dissolved in a small amount of water were slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and the octadecane@polystyrene-polyaniline microcapsule dispersion was finally obtained.

[0058] (3) First, pre-emulsification was performed. 0.8 parts of fatty alcohol polyoxyethylene ether, 1 part of sodium dodecyl sulfate, 23 parts of butyl acrylate, and 11 parts of methyl methacrylate were added to 24 parts of deionized water and homogenized at high speed for 5 min. Then, 0.8 parts of methacryloyloxyethyl phosphocholine were added and mixed evenly to obtain a pre-emulsion for later use. Separately, 0.21 parts of potassium persulfate were dissolved in 8 parts of deionized water to prepare an initiator solution. In a three-necked flask containing 48 parts of deionized water and 0.08 parts of sodium bicarbonate, the temperature was raised to 75°C. Then, the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h) were added dropwise simultaneously. After the addition was completed, the temperature was raised to 80°C and the reaction was continued for 2 h. After the reaction was completed, an appropriate amount of ammonia was added dropwise to adjust the pH of the system to neutral to enhance the storage stability of the emulsion, thus obtaining phosphocholine-modified polyacrylate.

[0059] (4) Mix 0.06 parts of MXene dispersion with 1.8 parts of phosphocholine-modified polyacrylate emulsion, then add 0.2 parts of octadecane@polystyrene-polyaniline microcapsules, and sonicate to form a uniformly dispersed composite coating slurry. Then, use a vacuum filtration process to deposit the above slurry onto the surface of polyester fabric, and after drying, obtain a phase change microcapsule-MXene-modified polyacrylate fabric coating and the corresponding coated fabric.

[0060] Examples 6-8

[0061] Based on the preparation method of phase change microcapsule-MXene-modified polyacrylate fabric coating in Implementation 1, Examples 6-8 respectively provide phase change microcapsule-MXene-modified polyacrylate fabric coatings and their coated fabrics with phase change microcapsule contents of 3%, 6% and 12%, respectively. The difference is that the amount of octadecane@polystyrene-polyaniline microcapsule dispersion added in step (4) is 0.06 parts, 0.13 parts and 0.28 parts, respectively, while other steps remain unchanged.

[0062] Comparative Example 1

[0063] Based on the preparation method of phase change microcapsule-MXene-modified polyacrylate fabric coating in Embodiment 1, this comparative example provides a fabric coating and its fabric, the difference being that in step (2), the initiator ammonium persulfate is replaced with the oil-soluble initiator azobisisobutyronitrile. Step (2) specifically includes the following steps.

[0064] (2) After centrifuging, washing, and drying the above octadecane@polystyrene microcapsules, 0.26 parts of the sample were dispersed in 96 parts of 0.1 M hydrochloric acid solution, and 1.05 parts of polyvinylpyrrolidone were added. The mixture was then sonicated to ensure uniform dispersion. Subsequently, 0.11 parts of aniline were added, and the mixture was stirred at high speed in an ice bath for 2 h to allow aniline to be fully adsorbed onto the surface of the microcapsules. The reaction system was maintained at 05℃ and 150 rpm stirring, and 0.23 parts of azobisisobutyronitrile solution dissolved in a small amount of water were slowly added dropwise. The reaction was continued for 16 h. After the reaction was completed, the system turned dark green, indicating that the polyaniline shell was successfully formed, and octadecane@polystyrene-polyaniline microcapsules were finally obtained.

[0065] Comparative Example 2

[0066] Based on the preparation method of phase change microcapsule-MXene-modified polyacrylate fabric coating in Embodiment 1, this comparative example provides a fabric coating and the fabric thereof, the difference being that in step (3), sodium dodecyl sulfate and methyl methacrylate are replaced with nonionic emulsifier Tween 80 and glycidyl methacrylate, and step (3) specifically includes the following steps.

[0067] (3) Add 0.9 parts of fatty alcohol polyoxyethylene ether, 0.75 parts of Tween 80, 19 parts of butyl acrylate, and 9.5 parts of glycidyl methacrylate to 20 parts of deionized water and homogenize at high speed for 5 min. Then add 1.1 parts of methacryloyloxyethyl phosphocholine and mix well to obtain a pre-emulsion for later use. Separately, dissolve 0.19 parts of potassium persulfate in 9 parts of deionized water to prepare an initiator solution. In a three-necked flask containing 41 parts of deionized water and 0.11 parts of sodium bicarbonate, heat to 75°C. Then simultaneously add the pre-emulsion (completed within 2 h) and the potassium persulfate solution (completed within 2.5 h). After the addition is complete, heat to 80°C and continue the reaction for 2 h. After the reaction is complete, add an appropriate amount of ammonia to adjust the pH of the system to neutral to enhance the storage stability of the emulsion.

[0068] Comparative Example 3

[0069] Based on the preparation method of phase change microcapsule-MXene-modified polyacrylate fabric coating in Embodiment 1, this comparative example provides a fabric coating and its fabric, the difference being that step (4) is different, and step (4) specifically includes the following steps.

[0070] (4) Mix 0.1 parts of MXene dispersion with 2 parts of phosphocholine-modified polyacrylate emulsion, then add 0 parts of octadecane@polystyrene-polyaniline microcapsules, and sonicate to form a uniformly dispersed composite coating slurry. Then, use a vacuum filtration process to deposit the above slurry onto the surface of polyester fabric, and after drying, obtain the MXene-modified polyacrylate fabric coating and the corresponding coated fabric.

[0071] Application examples

[0072] like Figure 1 The diagram shows the synthetic route of the polyaniline shell prepared according to an embodiment of the present invention. Aniline is added to octadecane@polystyrene microcapsules in an acidic environment, allowing aniline to be fully adsorbed onto the surface of the octadecane@polystyrene microcapsules. With ammonium persulfate as an initiator, a layer of polyaniline is formed on the surface of the polystyrene. The octadecane@polystyrene-polyaniline microcapsules provided by the present invention use octadecane, a phase change material, as the core material, and polystyrene and polyaniline as a double-layer conductive wall material. This not only provides a high specific surface area to increase water molecule adsorption sites, but its polyaniline shell can also serve as a highly efficient Grotthuss proton conduction bridge, which is expected to significantly improve the humidity-sensitive response of the composite material.

[0073] In Comparative Example 1, replacing ammonium persulfate with the oil-soluble initiator azobisisobutyronitrile failed to synthesize octadecane@polystyrene-polyaniline microcapsules.

[0074] like Figure 2The diagram shows the synthetic route of the phosphoric acid choline-modified polyacrylate prepared according to this invention. By attaching phosphoric acid choline groups to the side chains of polyacrylate, a stable water molecule reserve layer is formed inside the coating due to the strong hydration effect of the phosphoric acid choline groups, thus providing an ideal medium for the continuous transition of protons.

[0075] In Comparative Example 2, replacing sodium dodecyl sulfate and methyl methacrylate with nonionic emulsifiers Tween 80 and glycidyl methacrylate, failed to successfully synthesize phosphocholine-modified polyacrylate.

[0076] Taking Example 1 as an example, the obtained product was characterized and analyzed. For example... Figure 3 As shown in (a), the octadecane@polystyrene microcapsules have a smooth surface and regular morphology, and after being coated with polyaniline ( Figure 3 (bd), its surface forms a uniformly distributed granular structure, and the surface roughness is significantly increased, indicating that polyaniline has been successfully deposited on the surface of the microcapsule. Figure 3 Further transmission electron microscopy results of (gh) revealed a distinct coating layer structure on the outer layer of the octadecane@polystyrene-polyaniline microcapsules, confirming the formation of a core-shell structure. Elemental analysis results... Figure 3 (df) indicates that carbon and nitrogen elements are uniformly distributed on the surface of octadecane@polystyrene-polyaniline microcapsules, with the presence of nitrogen further confirming the introduction of the polyaniline shell. Figure 3 (i) Infrared spectroscopy results show that the octadecane@polystyrene-polyaniline microcapsules retain the characteristic absorption peaks of polystyrene while exhibiting the characteristic absorption peaks of polyaniline, indicating that polyaniline has been successfully coated onto the polystyrene surface. The above morphological, elemental, and structural analysis results demonstrate that the present invention has successfully prepared a double-shell structure of octadecane@polystyrene-polyaniline phase change microcapsules with a polystyrene inner layer and a polyaniline outer layer.

[0077] like Figure 4 As shown in (ac), the differential scanning calorimetry results of Example 1 indicate that the phase transition temperature range of the pure phase change core material octadecane, after being encapsulated with polystyrene and polyaniline to form microcapsules, changes compared to the pure core material. This step confirms that octadecane@polystyrene-polyaniline microcapsules can effectively broaden the phase transition temperature range of the material and improve its applicability for thermal regulation. Figure 4 As shown in (d), both octadecane@polystyrene microcapsules and octadecane@polystyrene-polyaniline microcapsules have energy storage efficiencies exceeding 99%, indicating that they can maintain high phase change energy storage capacity even after introducing a double-shell structure. Figure 4As shown in (ef), after multiple thermal cycling tests, the octadecane@polystyrene-polystyrene-polyaniline microcapsules exhibited small fluctuations in phase transition temperature and small changes in phase transition enthalpy, demonstrating good cycling stability. These results indicate that the double-shell phase change microcapsules prepared in this invention, while ensuring high energy storage efficiency, possess stable phase change behavior and good thermal cycling reliability, meeting the requirements for long-term thermal management applications.

[0078] like Figure 5 As shown in (a), the infrared spectrum of the phosphocholine-modified polyacrylate indicates that the phosphocholine groups have been successfully introduced into the polymer chain. After the phosphocholine-modified polyacrylate, MXene, and bishell phase change microcapsules were composited onto the fabric surface, the coating morphology was observed using a scanning electron microscope. Figure 5 (bc) and Figure 5 As shown in (e), the original fabric fiber surface is relatively smooth, while the coated fabric of Example 1 forms a continuous composite coating structure, with the fibers uniformly covered and bonded by the coating material. Figure 5 As shown in (d), the EDS elemental analysis results show that carbon, nitrogen, oxygen, phosphorus and titanium are uniformly distributed in the coating, corresponding to the constituent elements of phosphocholine modified polyacrylate, MXene and double-shell microcapsules, indicating that the three components have been successfully compounded and uniformly constructed in the coating on the fabric surface.

[0079] like Figure 6 The results shown are the performance test results of the coated fabrics prepared in Examples 1, 6-8, and Comparative Example 3. Figure 6(ac) It can be seen that the coated fabrics containing octadecane@polystyrene-polyaniline microcapsules in Examples 1 and 6-8 have significantly higher humidity sensitivity than Comparative Example 3 without microcapsules, indicating that the introduction of microcapsules has a significant promoting effect on humidity response performance. This performance improvement does not come from a single component, but from the synergistic effect of the composite system. Among them, phosphocholine-modified polyacrylate constructs a stable hydrophilic hydration network in the coating, which can effectively regulate the adsorption and transport process of water molecules and provide a continuous response medium for humidity changes; MXene, as a two-dimensional conductive material, forms multi-scale conductive pathways in the coating and together with the polyaniline shell to construct a composite conductive network, thereby significantly improving the electrical signal transmission efficiency and response sensitivity; octadecane@polystyrene-polyaniline double-shell microcapsules provide a high specific surface area interface structure, which not only enhances the adsorption capacity of water molecules, but its polyaniline shell can also act as an interfacial active layer, forming a multi-interfacial coupling effect with the hydration network and conductive pathways, thereby promoting the overall humidity response process. Through the synergistic effect of the above three factors, water molecules achieve a highly efficient process of "adsorption-transport-dissociation-electrical signal conversion" in the coating, thereby significantly improving humidity response performance. As the microcapsule content increases, the humidity sensitivity shows a trend of first increasing and then decreasing, reaching a maximum value (22150%) when the microcapsule content is 9%. Figure 6 (dh) represents the dynamic response test results of Example 1, which further verifies that the coated fabric of Example 1 has excellent and stable humidity response performance.

[0080] like Figure 7 This is a comparison of the surface temperature changes during heating and cooling of the original polyester fabric (Pristine PET) and the coated fabric (Coated PET) from Example 1. Figure 7 As shown in (a), during the heating stage, the surface temperature of both fabrics increased over time, but the heating rate of the coated fabric was significantly lower than that of the original polyester fabric, with a maximum temperature difference of 3.14℃, indicating that the composite coating can effectively delay the heat accumulation process in the fabric. Specifically, the octadecane@polystyrene-polyaniline double-shell microcapsules undergo a solid-liquid phase transition during heating, achieving latent heat regulation by absorbing and storing heat, thereby reducing the rate of temperature rise of the fabric surface; MXene constructs a continuous or semi-continuous two-dimensional thermally conductive network in the coating, which helps to rapidly and uniformly disperse heat on the fabric surface and inside the coating, avoiding local heat concentration; phosphocholine-modified polyacrylate improves the uniformity and structural stability of the coating interface through its hydrophilic hydration structure, enabling the microcapsules and MXene to form a stable distribution on the fabric surface, thereby enhancing the coordination and consistency of overall heat transfer. Under the synergistic effect of the above three factors, the fabric exhibits a comprehensive thermal management mechanism with uniform regulation during heating, thus significantly reducing the heating rate and improving the uniformity of heat distribution. Figure 7As shown in (b), the temperature drop rate of the coated fabric was also more gradual in the subsequent cooling stage, mainly due to the release of stored heat by the phase change microcapsules during crystallization, which, together with the uniform heat conduction promoted by MXene and the stable regulation of the heat release process by the polyacrylate matrix, formed a continuous heat buffering effect. Figure 7 (c) The infrared thermal imaging results further verify the synergistic enhancement effect of the composite system in terms of thermal management performance.

[0081] To evaluate the performance of the functional fabric under actual wearing conditions, the coated fabric prepared in Example 1 was attached to the neck and back of the hand, and its humidity and temperature response was monitored during plank exercises. Figure 8 As shown in (a), with the extension of exercise time, the amount of sweat produced by the human body increases, and the humidity response signal reaches its peak at approximately 150 s; after exercise stops, the signal gradually decreases and returns to its initial level. Compared with the original fabric, the coated fabric exhibits more stable thermo-humidity response characteristics during dynamic sweating. Figure 8 (b) and Figure 9 As shown, during the rising phase of body temperature, the surface temperature of the fabric is lower than that of the original fabric, while during the falling phase, it is higher than that of the original fabric, demonstrating excellent dynamic thermal regulation capabilities. This effect mainly originates from the reversible heat absorption and release regulation of the phase change microcapsules. Simultaneously, MXene constructs a conductive network to ensure continuous and stable transmission of electrical signals under conditions of movement and humidity changes; phosphocholine-modified polyacrylate provides a stable hydrophilic hydration environment, promoting the repeatable output of sweat transmission and humidity response signals. The synergistic effect of these three elements enables the fabric to simultaneously possess thermal regulation and stable humidity sensing capabilities under dynamic human body conditions.

[0082] Figure 10 This invention presents a conceptual diagram of a phase change microcapsule-MXene-modified polyacrylate coated fabric. The invention successfully constructs a double-shell phase change microcapsule structure (octadecane@polystyrene-polyaniline microcapsule) with a polyaniline shell by in-situ polymerization of aniline in an acidic medium to encapsulate octadecane@polystyrene microcapsules. A polyacrylate resin containing phosphocholine functional groups is synthesized, composited with the phase change microcapsules and MXene nanomaterials, and a multifunctional coating is constructed on the fabric surface using a vacuum filtration process. The functional fabric prepared by this invention exhibits excellent real-time humidity monitoring capabilities and can achieve dynamic thermal management through the reversible endothermic / exothermic effect of the phase change material, effectively maintaining the thermal comfort of the human body during exercise. It is suitable for applications in smart temperature-controlled textiles or smart wearables.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a phase change microcapsule-MXene-modified polyacrylate fabric coating, characterized in that, Includes the following steps: MXene dispersion and choline phosphate modified polyacrylate emulsion were mixed, followed by the addition of octadecane@polystyrene-polyaniline microcapsule dispersion, and the mixture was stirred evenly to obtain a composite coating slurry. The composite coating slurry was deposited on the fabric surface using a vacuum filtration process and then dried to obtain a phase change microcapsule-MXene-modified polyacrylate fabric coating.

2. The method for preparing the phase change microcapsule-MXene-modified polyacrylate fabric coating according to claim 1, characterized in that, The mass ratio of the MXene dispersion, the phosphocholine-modified polyacrylate emulsion, and the octadecane@polystyrene-polyaniline microcapsule dispersion is 0.05~0.2:1~2.5:0.1~0.35; And / or, the octadecane@polystyrene-polyaniline microcapsule dispersion contains octadecane@polystyrene-polyaniline microcapsules composed of a core material and a wall material, wherein the core material is octadecane, the inner side of the wall material is a polystyrene layer, and the outer side of the wall material is a polyaniline layer.

3. The method for preparing the phase change microcapsule-MXene-modified polyacrylate fabric coating according to claim 1, characterized in that, The preparation method of the octadecane@polystyrene-polyaniline microcapsule dispersion includes the following steps: Polyvinyl alcohol is dissolved in water and mixed evenly to form an aqueous phase. Styrene, octadecane, azobisisobutyronitrile and divinylbenzene are mixed evenly to form an oil phase. The oil phase is added to the aqueous phase and stirred at a stirring speed of 8000~12000 rpm for 3~5 min until homogeneous to obtain an emulsion. The emulsion was heated to 75-80℃ and reacted for 8-10 h, followed by centrifugation, washing and vacuum drying to obtain octadecane@polystyrene microcapsules; Octadecylene@polystyrene microcapsules were dispersed in a 0.1M acid solution, polyvinylpyrrolidone was added and dispersed evenly, aniline was added, and the mixture was stirred at 8000~12000 rpm for 3~5 min under ice bath conditions until homogeneous. Then the first initiator was added dropwise to react. After the reaction was completed, an octadecylene@polystyrene-polyaniline microcapsule dispersion was obtained.

4. The method for preparing the phase change microcapsule-MXene-modified polyacrylate fabric coating according to claim 3, characterized in that, The mass ratio of the polyvinyl alcohol, the styrene, the octadecane, the azobisisobutyronitrile, and the divinylbenzene is 0.8~1.6:2.5~4:2.5~4:0.15~0.35:0.25~0.

4.

5. The method for preparing the phase change microcapsule-MXene-modified polyacrylate fabric coating according to claim 3, characterized in that, The mass ratio of the octadecane@polystyrene microcapsules, the polyvinylpyrrolidone, the aniline, and the first initiator is 0.2~0.35:0.8~1.2:0.08~0.15:0.2~0.3; And / or, the mass ratio of the octadecane@polystyrene microcapsules to the acid solution is 0.15~0.25:50~150; And / or, the first initiator includes any one of ammonium persulfate, potassium persulfate, or sodium persulfate.

6. The preparation method of the phase change microcapsule-MXene-modified polyacrylate composite coating according to claim 1, characterized in that, The method for preparing the phosphoric acid choline-modified polyacrylate emulsion includes the following steps: Nonionic emulsifier, ionic emulsifier, butyl acrylate and methyl methacrylate are added to deionized water and stirred at 8000~12000 rpm for 3~5 min to homogenize and emulsify. Then, methacryloyloxyethyl phosphocholine is added and mixed evenly to obtain a pre-emulsion. The second initiator was added to an aqueous solution of sodium bicarbonate and heated. The pre-emulsion was added dropwise, heated to 75-80°C and reacted. The pH was adjusted to neutral to obtain a phosphocholine-modified polyacrylate emulsion.

7. The method for preparing the phase change microcapsule-MXene-modified polyacrylate composite coating according to claim 6, characterized in that, The mass ratio of the nonionic emulsifier, the butyl acrylate, the methyl methacrylate, the methacryloyloxyethyl phosphocholine, the second initiator, and the sodium bicarbonate is 0.6~1.5:15~25:6~12:0.6~1.5:0.12~0.22:0.06~0.15; And / or, the mass ratio of the ionic emulsifier to the deionized water is 0.5~1.5:60~100.

8. The method for preparing the phase change microcapsule-MXene-modified polyacrylate composite coating according to claim 6, characterized in that, The nonionic emulsifier includes any one or more of polyoxyethylene-8-octylphenyl ether, polyoxyethylene dehydrated sorbitan monooleate, polyoxyethylene dehydrated sorbitan monolaurate, or dehydrated sorbitan fatty acid ester. And / or, the ionic emulsifier includes any one or more of sodium dodecyl sulfate or sodium dodecylbenzene sulfonate; And / or, the second initiator includes any one of potassium persulfate, ammonium persulfate, or sodium persulfate.

9. A phase change microcapsule-MXene-modified polyacrylate fabric coating, characterized in that, The phase change microcapsule-MXene-modified polyacrylate fabric coating was prepared according to any one of claims 1 to 8.

10. The application of the phase change microcapsule-MXene-modified polyacrylate fabric coating of claim 9 in the field of smart temperature-controlled textiles or smart wearables.

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