Hollow-structure flexible cashmere sensing yarn with intelligent temperature adjustment function and processing method and application of hollow-structure flexible cashmere sensing yarn

Abstract

The invention discloses a processing method and application of a hollow-structure flexible cashmere sensing yarn with an intelligent temperature adjusting function. The yarn prepared by the invention has dual functions of electric heating and light heat storage, and can intelligently adjust the temperature according to the environmental change by combining the warm-keeping characteristic of the hollow structure, so that the wearing comfort is improved. According to the processing method, an innovative spinning and functional coating process is adopted, and the yarn is endowed with excellent conductivity, heat retention property and durability. The method is suitable for the field of high-end intelligent textiles, including intelligent clothing, health monitoring, medical care and the like, and has a wide market application prospect.

Description

Technical Field

[0001] The invention relates to a flexible cashmere sensing yarn with a hollow structure and intelligent temperature regulation, and a processing method and application thereof, belonging to the technical field of intelligent wearable textiles. Background Art

[0002] With the development of intelligent technology and the improvement of people's quality of life, intelligent textiles have gradually become a research hotspot in the textile industry. Intelligent textiles not only need to have the softness, warmth and comfort of traditional textile materials, but also need to be endowed with sensing, response and adjustment functions. Such products have broad application prospects in intelligent wearable devices, medical monitoring, sports equipment and protective clothing in special environments.

[0003] Existing smart textile technology usually achieves intelligence by embedding sensors or functional films into textiles. However, this method has the following major problems: first, the integration of sensors and fabrics is poor, which affects wearing comfort; second, the rigidity and brittleness of functional components may reduce the service life of textiles; third, the functions of existing smart textiles are mostly single functions, such as only having electrical conductivity or electrothermal properties, and cannot meet multi-functional needs at the same time. In addition, although the application of flexible materials in smart textiles has attracted attention, most flexible sensing materials are difficult to balance breathability, lightness and warmth, which is particularly prominent in cold climates or scenarios where they need to be worn for a long time. Hollow structure yarn is considered to be a potential material because of its light weight and good warmth retention, but there is currently no mature process to combine it with electrothermal and photothermal functions to form a flexible sensing yarn with intelligent temperature regulation function.

[0004] In recent years, new two-dimensional materials such as MXene and graphene have gradually been used in the research of smart materials due to their excellent conductivity, thermal responsiveness and processability. They can give fiber substrates special functions through coating, doping and other methods. Summary of the invention

[0005] The technical problem to be solved by the present invention is: the problems of single function, poor integration, insufficient flexibility and comfort in existing smart textiles, so as to realize the multiple integration of electric heating, photothermal and warming functions, and meet the needs of smart clothing, health monitoring and medical care.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: to provide a processing method for a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation, comprising the following steps: selecting cashmere and water-soluble vinylon yarn as raw materials, and using the water-soluble vinylon yarn as the core yarn. After the cashmere is opened, woolen, combed and drawn, it is spun on a vortex spinning device so that the cashmere surrounds the water-soluble vinylon yarn to form a cortex; the spun yarn is heat-treated to dissolve the water-soluble fiber to form a hollow structure, and the yarn is cleaned and dried to obtain a cashmere yarn with a hollow structure; conductive micro-nano materials and photothermal storage materials are doped into the synthesized Mxene material to enhance the electrothermal performance and realize the photothermal conversion function, and the coating method is used to uniformly coat the surface of the cashmere yarn to form a functional layer; the outermost layer of the treated cashmere yarn is sealed to obtain a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation.

[0007] Preferably, the heat treatment is specifically as follows: steaming the yarn at 60-80°C for 15-25 minutes, then dissolving the water-soluble vinylon yarn in a water bath at 80-90°C, and finally washing the yarn at 80°C to form a hollow structure.

[0008] Preferably, the synthesis of the MXene material adopts a hydrofluoric acid direct etching method, and a MXene nanosheet dispersion with an interlayer spacing is obtained through etching reaction and intercalation reaction. The whole process goes through four steps of etching-acid removal-layering-cleaning to finally obtain a MXene dispersion of the required concentration.

[0009] Preferably, the conductive micro-nano material includes at least one of graphene, carbon black, and silver nanoparticles; and the light-heat storage material is zirconium oxide or aluminum oxide micro-nano material.

[0010] Preferably, the preparation method of the functional layer is: the cashmere yarn with a hollow structure is cleaned with an ethanol solution and deionized water to remove surface impurities, and then dried at 60°C for 4 hours for pre-cleaning treatment; then the pretreated cashmere yarn is repeatedly immersed in a composite dispersion of Mxene material, conductive micro-nano material and photothermal storage material, and dried at room temperature after each immersion for 5 minutes, and this process is repeated more than 5 times to ensure uniform coating and conductive performance; finally, post-curing treatment is performed at 60°C to complete the preparation of the functional layer.

[0011] Preferably, the sealing material used in the sealing treatment is at least one of polyurethane or Ecoflex silicone rubber, and the sealing material is applied to the surface of the cashmere yarn and cured for 24 hours after application.

[0012] Preferably, the processing method of the hollow structure flexible cashmere sensor yarn with intelligent temperature regulation comprises the following steps:

[0013] Step 1): Preparation of hollow structure cashmere yarn: cashmere and water-soluble vinylon yarn are used as raw materials, cashmere staple fibers are first opened, woolen, combed and drawn, and then spun into vortex-spun yarn on a vortex spinning machine using water-soluble vinylon yarn as core yarn and cashmere as wrapping fiber, and then the twisted single yarn is relaxed and steamed at 60-80°C for 15-25 minutes, and then the water-soluble vinylon yarn is dissolved in a water bath at 80-90°C for 10-15 minutes; finally, the yarn is washed at 80°C and taken out;

[0014] Step 2): Layered Ti3C2T x Synthesis of MXene: Ti3AlC2 was used as the precursor of MAX phase, and its powder was slowly added to a 40% hydrofluoric acid solution and kept in an ice bath for 5 min to avoid the temperature rise caused by the reaction exotherm; then, the mixture was stirred at 600 r / min for 48 h at 35 °C to achieve selective etching of the Al atomic layer in Ti3AlC2; after etching, the reaction solution was rinsed with deionized water, and the resulting mixture was placed in a centrifuge at 3500 r / min for 5 min, and the supernatant was poured out; then, deionized water was added again and Ti3C2T was manually shaken. x The dispersion was washed repeatedly until the pH value of the supernatant was about 5-6; finally, the aqueous dispersion was freeze-dried to prepare Ti3C2T x MXene dispersion;

[0015] Step 3): Preparation of electrothermal and photothermal composite materials: Dissolve the required electrothermal and photothermal materials in deionized water to form a uniform transparent solution, which is slowly injected into the Ti3C2T x The MXene dispersion was added and mechanical stirring was used to ensure uniformity, and then the composite solution was ultrasonically treated for 10 min to obtain an electrothermal composite material dispersion, thereby preparing a composite material with electrothermal, photothermal and conductive properties;

[0016] Step 4): Preparation of the cashmere yarn surface functional layer: clean the cashmere yarn with ethanol solution and deionized water, dry it at 60°C for 4 hours, and then immerse the pre-cleaned cashmere yarn in the composite material with electrothermal, photothermal and conductive properties prepared in step 3), immerse it for 5 minutes and then dry it at room temperature, repeat the immersion process for more than 5 times to obtain a cashmere yarn with electrothermal and photothermal functions;

[0017] Step 5): Encapsulation of the outermost layer of cashmere yarn: Use a scraper or brush to apply the mixed sealing material on the clean and dust-free cashmere yarn surface, covering all areas to form a protective layer, and cure it in a temperature environment of 100-130°C. After curing, check whether the cured encapsulation layer has defects, and polish or repair it to ensure the integrity and performance of the device, so as to obtain a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation.

[0018] Preferably, the hollow structure flexible cashmere sensor yarn is stored in a dry, cool, dust-free environment to maintain its performance and extend its service life. The yarn is stored in a sealed packaging material, such as a moisture-proof bag or a sealed container, and the temperature of the storage environment is controlled to be at room temperature, avoiding direct sunlight and heavy pressure to ensure that the flexible cashmere sensor yarn is kept in the best condition before use.

[0019] The present invention also provides a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation prepared by the above processing method, and its structure comprises a hollow structure layer, a flexible cashmere layer, a functional layer and a protective layer from the inside to the outside.

[0020] The present invention also provides the application of the above-mentioned intelligent temperature-regulating hollow structure flexible cashmere sensor yarn in smart clothing. The yarn is woven into daily clothing to automatically adjust the internal temperature of the clothing according to the change of ambient temperature, providing users with a comfortable wearing experience; it can be used in health monitoring equipment, and can be used to monitor human body temperature and physiological parameters by integrating temperature sensors and electronic control units; it can be used for outdoor equipment for outdoor workers or athletes, such as gloves, hats, socks, etc., to adapt to different climatic conditions and provide necessary warming or cooling functions; it can be used in the field of medical care, such as making local heating fabric wristbands, insoles, etc. for electrothermal therapy, photothermal therapy, etc.

[0021] The present invention uses hollow structure design and functional coating technology to give the yarn multiple functions of electric heating, light heating and warmth preservation, while also being lightweight, flexible and comfortable, achieving the integration of lightweight, comfort and multi-functions that are difficult to achieve with traditional textile materials. The core technical principle of the present invention is:

[0022] (1) Formation of hollow structure: Water-soluble fiber is used as the yarn core layer, cashmere fiber is wrapped in the outer layer, and the core yarn is dissolved by controlling the temperature to form a hollow structure with warmth retention and lightweight characteristics. This design not only improves the thermal insulation performance of the yarn, but also enhances its flexibility and breathability, providing a guarantee for wearing comfort.

[0023] (2) Empowerment of functional coating: A composite coating composed of MXene, conductive micro-nano materials (such as graphene, carbon black, etc.) and photothermal storage materials (such as zirconium oxide or aluminum oxide) is evenly coated on the surface of the yarn. This functional layer achieves intelligent temperature control through the following two mechanisms: one is the electric heating function, where the conductive material generates heat through electric current, which can quickly heat the yarn and provide a warming effect in a cold environment; the other is photothermal conversion, where the photothermal storage material absorbs sunlight or other light sources in the environment and converts light energy into heat energy, further improving the warmth performance.

[0024] (3) Sealing layer and durability design: The outermost layer is encapsulated with polyurethane (TPU) or silicone rubber to enhance the wear resistance, water resistance and anti-fouling properties of the yarn, so that it can still maintain good performance in complex usage scenarios.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) Lightweight and highly effective hollow structure design for warmth retention: The present invention introduces water-soluble fiber as the core yarn, which dissolves during processing to form a hollow structure, making the yarn extremely light and having excellent warmth retention. This structure not only improves the thermal insulation performance of the yarn, but also greatly improves the air permeability and wearing comfort, solving the technical problem of the difficulty of balancing the lightweight and warmth retention performance of traditional yarns.

[0027] (2) Multifunctional integrated intelligent temperature control technology: This invention realizes the dual temperature control capabilities of electric heating and photothermal heating by coating the yarn surface with a functional layer composed of MXene, conductive micro-nano materials and photothermal storage materials. This technology can automatically adjust the heat output of the yarn according to the changes in ambient temperature, meet the needs of smart wearables for dynamic temperature control, and expand the application scenarios of yarns under extreme climate conditions.

[0028] (3) Optimized design of flexibility and durability: The present invention uses cashmere as the main material and combines it with polyurethane (TPU) or silicone rubber packaging technology, which not only gives the yarn soft and skin-friendly properties, but also significantly enhances the wear resistance, waterproofness and anti-fouling properties of the yarn, making its performance stable during long-term use, thus overcoming the defect of easy wear and tear of existing smart textiles.

[0029] (4) Efficient and environmentally friendly preparation process: The present invention achieves efficient utilization of materials in the processing technology. Functional yarns are prepared through simple dissolution, cleaning and coating processes, avoiding complex mechanical embedding or stacking processes, lowering production costs, and being suitable for large-scale industrial applications. At the same time, it reduces resource waste and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a cross section of a hollow structured flexible cashmere sensing yarn provided by the present invention;

[0031] Figure 2 A process flow chart of a method for processing a hollow structure flexible cashmere sensor yarn provided by the present invention;

[0032] Figure 3 A production layout for a winter coat prepared in Example 1;

[0033] Figure 4 This is the production layout of the Chinese physiotherapy knee pad prepared in Example 2. DETAILED DESCRIPTION

[0034] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the intelligent temperature-regulating hollow structure flexible cashmere sensing yarn prepared by the present invention adopts a multi-layer structure design, which includes a hollow structure layer 1, a flexible cashmere layer 2, a functional layer 3, and a protective layer 4 from the inside to the outside.

[0036] The process flow of the method for processing the hollow structure flexible cashmere sensor yarn provided by the present invention is as follows: Figure 2 As shown, the preparation steps are as follows: first, the cashmere fiber is mixed with the water-soluble vinylon fiber, and after being opened, combed and other treatments, the yarn is formed through a vortex spinning process; then, the yarn is treated under specific temperature and water bath conditions to dissolve the water-soluble vinylon fiber and form a hollow structure.

[0037] Example 1

[0038] This embodiment provides a method for processing a hollow structure flexible cashmere sensor yarn and its application in smart clothing, and the prepared hollow structure flexible cashmere sensor yarn is used to prepare a winter coat. The specific method is as follows:

[0039] Select high-quality cashmere fibers (length 38-40mm, fineness 14-16μm), and go through opening, wool blending, combing and drawing to ensure fiber uniformity and softness; select water-soluble vinylon fibers (fineness 18-20D, dissolving temperature 80-90℃) as core yarn raw materials, adopt vortex spinning process, use water-soluble vinylon fibers as core yarns and cashmere fibers as covering fibers, and spin to form composite cashmere yarns with a fineness of 30tex;

[0040] Subsequently, the core yarn was dissolved in a water bath at 80 °C for 10 min to form a hollow structure.

[0041] The surface of the cashmere yarn is coated with a MXene composite material (with a mass content of 1.5%, doped with 0.5wt% graphene and 1wt% zirconium oxide) to form a uniform functional layer; after coating, the yarn is cured at 60°C for 4 hours; the smart temperature-regulating yarn and ordinary wool yarn are interwoven using a warp knitting process with a density of 18 stitches / cm to form a double-layer structural fabric, with the inner layer being the smart temperature-regulating functional fabric and the outer layer being ordinary cashmere fabric.

[0042] The smart temperature-regulating fabric is cut into the main part of the coat and sewn. The smart yarn is mainly concentrated in the inner area close to the skin to achieve the temperature control function. Conductive yarn and flexible temperature sensing modules are embedded inside the clothing to ensure the integrity of the functional area.

[0043] Example 2

[0044] This embodiment provides a photothermal therapy device for the medical field, using a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation as the core material to prepare a photothermal therapy knee pad suitable for arthritis patients. The specific method is as follows:

[0045] Combed cashmere fibers (length 36-38mm, fineness 15μm) are selected to improve the softness and skin-friendliness of the yarn, and water-soluble vinylon fibers (fineness 16-18D) are used as the core yarn raw material. After dissolution, a hollow structure is formed to reduce the weight of the yarn. Through the air-jet spinning process, the cashmere fibers are prepared into hollow structure cashmere yarns with a linear density of 40tex. The yarns are cleaned and coated with ethanol to form a composite coating containing 2wt% MXene on the surface.

[0046] The weft knitting process is used with a density of 20 stitches / cm to weave a double-sided fabric. The inner layer is an intelligent temperature-regulating cashmere fabric, and the outer layer is an ordinary cashmere fiber layer. The fabric is cut into an ergonomically designed knee pad shape to ensure that the intelligent yarn in each area is evenly distributed. Finally, the flexible conductive yarn and temperature control module are embedded in the inside of the knee pad, and the edges are sealed using knitting technology to ensure the stability and durability of the fabric structure.

Claims

1. A method for processing a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation, characterized in that: The following steps are involved: Cashmere and water-soluble vinylon yarn were selected as raw materials, and the water-soluble vinylon yarn was used as the core yarn. After the cashmere was opened, woolen, combed and drawn, it was spun on a vortex spinning device so that the cashmere formed a cortex around the water-soluble vinylon yarn. The spun yarn was heat-treated to dissolve the water-soluble fiber to form a hollow structure, and the yarn was cleaned and dried to obtain a cashmere yarn with a hollow structure. Conductive micro-nano materials and photothermal storage materials were doped into the synthesized Mxene material to enhance the electrothermal performance and realize the photothermal conversion function, and the material was evenly coated on the surface of the cashmere yarn by a coating method to form a functional layer. The outermost layer of the treated cashmere yarn was sealed to obtain a hollow structure flexible cashmere sensing yarn with intelligent temperature regulation.

2. The method for processing the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The heat treatment is specifically as follows: steaming the yarn at 60-80°C for 15-25 minutes, then dissolving the water-soluble vinylon yarn in a water bath at 80-90°C, and finally washing the yarn at 80°C to form a hollow structure.

3. The processing method of the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The synthesis of the MXene material adopts a hydrofluoric acid direct etching method, and a MXene nanosheet dispersion with an interlayer spacing is obtained through etching reaction and intercalation reaction. The whole process goes through four steps of etching-acid removal-layering-cleaning, and finally a MXene dispersion of the desired concentration is obtained.

4. The processing method of the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The conductive micro-nano material includes at least one of graphene, carbon black and silver nanoparticles; the light heat storage material is zirconium oxide or aluminum oxide micro-nano material.

5. The method for processing the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The preparation method of the functional layer is as follows: the cashmere yarn with a hollow structure is cleaned with an ethanol solution and deionized water to remove surface impurities, and then dried at 60° C. for 4 hours for pre-cleaning treatment; then the pre-treated cashmere yarn is repeatedly immersed in a composite dispersion of Mxene material, conductive micro-nano material and photothermal storage material, and dried at room temperature after each immersion for 5 minutes, and this process is repeated for more than 5 times to ensure uniform coating and conductive performance; finally, a post-curing treatment is performed at 60° C. to complete the preparation of the functional layer.

6. The method for processing the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The sealing material used in the sealing treatment is at least one of polyurethane or Ecoflex silicone rubber. The sealing material is applied to the surface of the cashmere yarn and cured for 24 hours after application.

7. The method for processing the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1): Preparation of hollow structure cashmere yarn: cashmere and water-soluble vinylon yarn are used as raw materials, cashmere staple fibers are first opened, woolen, combed and drawn, and then spun into vortex-spun yarn on a vortex spinning machine using water-soluble vinylon yarn as core yarn and cashmere as wrapping fiber, and then the twisted single yarn is relaxed and steamed at 60-80°C for 15-25 minutes, and then the water-soluble vinylon yarn is dissolved in a water bath at 80-90°C for 10-15 minutes; finally, the yarn is washed at 80°C and taken out; Step 2): Layered Ti3C2T x Synthesis of MXene: Ti3AlC2 was used as the precursor of MAX phase, and its powder was slowly added into a 40% hydrofluoric acid solution and kept in an ice bath for 5 min to avoid the exothermic reaction and temperature rise. Subsequently, the mixture was stirred at 600 r / min at 35 °C for 48 h to achieve selective etching of the Al atomic layer in Ti3AlC2. After etching, the reaction solution was rinsed with deionized water, and the resulting mixture was placed in a centrifuge and centrifuged at 3500 r / min for 5 min, and the supernatant was poured out; then, deionized water was added again and the Ti3C2T x The dispersion was washed repeatedly until the pH value of the supernatant was about 5-6; finally, the aqueous dispersion was freeze-dried to prepare Ti3C2T x MXene dispersion; Step 3): Preparation of electrothermal and photothermal composite materials: Dissolve the required electrothermal and photothermal materials in deionized water to form a uniform transparent solution, which is slowly injected into the Ti3C2T x The MXene dispersion was added and mechanical stirring was used to ensure uniformity, and then the composite solution was ultrasonically treated for 10 min to obtain an electrothermal composite material dispersion, thereby preparing a composite material with electrothermal, photothermal and conductive properties; Step 4): Preparation of the cashmere yarn surface functional layer: clean the cashmere yarn with ethanol solution and deionized water, dry it at 60°C for 4 hours, and then immerse the pre-cleaned cashmere yarn in the composite material with electrothermal, photothermal and conductive properties prepared in step 3), immerse it for 5 minutes and then dry it at room temperature, repeat the immersion process for more than 5 times to obtain a cashmere yarn with electrothermal and photothermal functions; Step 5): Encapsulation of the outermost layer of cashmere yarn: Use a scraper or brush to apply the mixed sealing material on the clean and dust-free cashmere yarn surface, covering all areas to form a protective layer, and cure it in a temperature environment of 100-130°C. After curing, check whether the cured encapsulation layer has defects, and polish or repair it to ensure the integrity and performance of the device, so as to obtain a hollow structure flexible cashmere sensor yarn with intelligent temperature regulation.

8. The method for processing the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 1, characterized in that: The hollow structure flexible cashmere sensing yarn is stored in a dry, cool and dust-free environment to maintain its performance and extend its service life.

9. The intelligent temperature-regulating hollow structure flexible cashmere sensor yarn prepared by the processing method according to any one of claims 1 to 8, characterized in that: The hollow structure flexible cashmere sensing yarn comprises a hollow structure layer, a flexible cashmere layer, a functional layer and a protective layer from the inside to the outside.

10. Application of the intelligent temperature-regulating hollow structure flexible cashmere sensor yarn according to claim 9 in intelligent clothing.

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