Layered design electronic textile as well as preparation method and application thereof

Abstract

The invention discloses a layered design electronic textile and a preparation method and application thereof, and the preparation method comprises the following steps: S1, dissolving a styrene-ethylene-butylene-styrene block copolymer in a solvent to obtain an SEBS solution; s2, the SEBS solution is adopted for electrostatic spinning, and SEBS non-woven fabric is obtained; s3, liquid metal is sprayed on the SEBS non-woven fabric, a joule heating circuit is sprayed on the upper surface of the SEBS non-woven fabric through the liquid metal, and a strain sensing circuit is sprayed on the lower surface of the SEBS non-woven fabric through the liquid metal; s4, the SEBS solution is deposited on the upper surface of the SEBS non-woven fabric through electrostatic spinning deposition, and an SEBS fiber layer is obtained; s5, plating silver on the SEBS fiber layer to obtain an SEBS silver-plated layer; and S6, dispersing thermochromic microcapsules in the SEBS solution, uniformly mixing the thermochromic microcapsules and the SEBS solution, and performing electrostatic spraying on the SEBS silver plating layer to obtain a TMs / SEBS layer. Various functions can be integrated in the electronic fabric, and the performance of the electronic fabric is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable intelligent fabrics, and in particular to a layered electronic textile and a preparation method and application thereof. Background Art

[0002] The rapid development of flexible electronic products has driven the demand for smart textiles, which can maintain the original breathability, comfort, biocompatibility and environmental stability of the fabric, and provide an ultra-close interface with human skin. As one of the most classic physical therapies, thermal therapy has great potential in relieving joint pain. However, traditional thermal therapy products usually lack precise temperature control and intuitive indication functions, which may cause overheating or insufficient temperature, affecting the effect of thermal therapy. How to combine thermal therapy with smart textiles to provide a multifunctional electronic textile (for example, with motion and physiological monitoring functions, etc.) is a technical problem that urgently needs to be solved. In addition, traditional electronic textiles are difficult to keep the fabric dry and clean, and do not have electromagnetic shielding functions, which cannot guarantee the normal operation of wearable electronic devices and reduce the impact of electromagnetic radiation on the human body. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a layered electronic textile and a preparation method and application thereof.

[0004] The technical solution of the present invention is as follows:

[0005] In one aspect, a method for preparing a layered electronic textile is provided, comprising the following steps:

[0006] S1: dissolving styrene-ethylene-butylene-styrene block copolymer in a solvent to obtain a SEBS solution;

[0007] S2: using the SEBS solution to perform electrospinning to obtain a SEBS nonwoven fabric;

[0008] S3: spraying liquid metal on the SEBS non-woven fabric, wherein the upper surface of the SEBS non-woven fabric is sprayed with the liquid metal for Joule heating circuit, and the lower surface of the SEBS non-woven fabric is sprayed with the liquid metal for strain sensing circuit;

[0009] S4: depositing the SEBS solution on the upper surface of the SEBS non-woven fabric by electrospinning deposition to obtain a SEBS fiber layer;

[0010] S5: silver-plating the SEBS fiber layer to obtain a SEBS silver-plated layer;

[0011] S6: dispersing thermochromic microcapsules in the SEBS solution, mixing them evenly, and then electrostatically spraying them on the SEBS silver-plated layer to obtain a TMs / SEBS layer.

[0012] Preferably, in step S1, the solvent is tetrahydrofuran, and the concentration of the SEBS solution is 15-20 wt.%.

[0013] Preferably, in step S2, the electrospinning is carried out at room temperature, the electrospinning syringe used is 10-20 ml, the needle size is 23-18G; the applied voltage, solution propulsion speed and fiber collection distance are set to 15-20 kV, 1-2 ml h -1 and 15-20cm.

[0014] Preferably, in step S3, liquid metal is sprayed on the SEBS non-woven fabric using a high-pressure spray gun.

[0015] Preferably, the loading amount of the liquid metal is 10-20 mg cm -2 .

[0016] Preferably, in step S5, silver is plated on the SEBS fiber layer using thermal evaporation equipment.

[0017] Preferably, when performing thermal evaporation, the vacuum degree is less than 5×10 -4 Pa in a vacuum chamber, and the evaporation rate is

[0018] Preferably, in step S6, the content of the thermochromic microcapsules is 5-10 wt.% of the weight of SEBS.

[0019] On the other hand, there is also provided a layered-design electronic textile prepared by the method for preparing the layered-design electronic textile described in any one of the above items, and its application in visualized thermal therapy and motion monitoring.

[0020] The beneficial effects of the present invention are:

[0021] The present invention can make the surface of the textile have extremely high roughness through the TMs / SEBS layer, realize excellent super-hydrophobic properties, and thus make the textile have excellent waterproof and self-cleaning effects; in addition, the TMs in the TMs / SEBS layer can display different colors under different temperature conditions, so that the textile can intuitively observe the working state of the heater through visual indications, ensuring safe thermal therapy; the SEBS silver-plated layer can make the fabric have an electromagnetic shielding effect, ensure the normal operation of wearable devices, and protect human health; the Joule heating circuit can make the textile have a thermal therapy effect; the strain sensing circuit can realize the monitoring of different movements, including walking, running, jumping, bending of fingers and elbows at different angles, and breathing monitoring of different frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of liquid metal spraying in a specific embodiment; wherein, Figure 1 a is a Joule heating circuit, Figure 1 b is the strain sensing circuit;

[0024] Figure 2 A schematic diagram of the structure of the layered design of the electronic textile of the present invention;

[0025] Figure 3 Schematic diagram of the change of surface temperature of electronic textiles over time under different voltages;

[0026] Figure 4 Digital photos and infrared images of wrist hyperthermia before and after application of 1.5V voltage;

[0027] Figure 5 A schematic diagram of the contact angle results of different liquids on the layered electronic textile designed according to the present invention;

[0028] Figure 6 Schematic diagram of the self-cleaning test results for removing natural dirt and ketchup using water flux;

[0029] Figure 7 Schematic diagram of the electromagnetic interference shielding effect of electronic textiles with different silver layer thicknesses in the X-band;

[0030] Figure 8 Schematic diagram of the electrical signal results of electronic textiles under 1%, 3%, 5%, and 10% strain;

[0031] Fig. 9 Schematic diagram of the electrical signal results of electronic textiles under 30%, 50%, 100%, and 150% strain. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. The words "including" or "comprising" and the like used in the disclosure of the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0033] In one aspect, the present invention provides a layered electronic textile and a preparation method and application thereof, comprising the following steps:

[0034] S1: dissolving styrene-ethylene-butylene-styrene block copolymer (SEBS) in a solvent to obtain a SEBS solution.

[0035] In a specific embodiment, the solvent is tetrahydrofuran, and the concentration of the SEBS solution is 15-20 wt.%.

[0036] S2: using the SEBS solution to perform electrospinning to obtain a SEBS nonwoven fabric.

[0037] In a specific embodiment, the electrospinning is performed at room temperature, the electrospinning syringe used is 10-20 ml, the needle size is 23-18G; the applied voltage, solution propulsion speed and fiber collection distance are set to 15-20 kV, 1-2 ml h -1 and 15-20cm.

[0038] S3: spraying liquid metal on the SEBS non-woven fabric, wherein the upper surface of the SEBS non-woven fabric is sprayed with the liquid metal for a Joule heating circuit, and the lower surface of the SEBS non-woven fabric is sprayed with the liquid metal for a strain sensing circuit.

[0039] In a specific embodiment, a high-pressure spray gun is used to spray liquid metal on the SEBS non-woven fabric; optionally, the loading amount of the liquid metal is 10-20 mg cm -2 .

[0040] In a specific embodiment, the Joule heating circuit and the strain sensing circuit are as follows: Figure 1As shown. In this embodiment, the Joule heating circuit and the strain sensing circuit can be sprayed on the SEBS non-woven fabric by using stainless steel masks with different patterns. Through the Joule heating circuit, the present invention can generate a temperature suitable for human body hyperthermia (49.50°C) at a low voltage of 1.5V, ensuring wearing safety and energy saving; in addition, the temperature of the textile can be well adjusted by adjusting the input voltage (the voltage is 0.5V to 4V, and the temperature can reach 25°C to 157.5°C).

[0041] S4: depositing the SEBS solution on the upper surface of the SEBS non-woven fabric by electrostatic spinning deposition to obtain a SEBS fiber layer.

[0042] S5: silver is plated on the SEBS fiber layer to obtain a SEBS silver-plated layer.

[0043] In a specific embodiment, a thermal evaporation device is used to plate silver on the SEBS fiber layer; optionally, when performing thermal evaporation, the vacuum degree is less than 5×10 -4 Pa in a vacuum chamber, and the evaporation rate is

[0044] It should be noted that thermal evaporation silver plating is an existing technology. Those skilled in the art can obtain silver layers of different thicknesses by changing the thermal evaporation time or the number of silver particles, thereby obtaining SEBS silver-plated layers with different electromagnetic shielding effects, ensuring the reliable operation of wearable devices in complex electromagnetic environments while effectively protecting the health of users. For example, when the silver layer thickness is 200nm, the electromagnetic interference shielding value is 23.64dB, reaching the minimum requirement of 20dB for commercial applications. When the silver layer thickness is 400nm, the shielding value is 34.83dB, reaching the military application requirement of 30dB.

[0045] S6: dispersing thermochromic microcapsules in the SEBS solution, mixing them evenly, and then electrostatically spraying them on the SEBS silver-plated layer to obtain a TMs / SEBS layer.

[0046] In a specific embodiment, the content of the thermochromic microcapsules is 5-10 wt.% based on the weight of SEBS.

[0047] It should be noted that the thermochromic microcapsules are prior art. In a specific embodiment, the thermochromic microcapsules can change the color of the textile from pink to orange at about 45°C. This allows the user to observe the working status of the heater through intuitive visual indications to ensure safe thermal therapy.

[0048] In a specific embodiment, the parameters used when this step is electrostatically sprayed are the same as the parameters used when step S2 is electrostatically spinning. In the present embodiment, by electrostatic spraying, TMs / SEBS electrostatic spray particles can be assembled in situ on the SEBS silver-plated layer, and a complex branching and aggregation structure similar to a coral reef is constructed, giving the textile surface extremely high roughness, thereby achieving excellent super-hydrophobic properties. The contact angles of various liquids such as water, milk, cola, beer, and acid, alkali and saline solutions on the textile surface are all more than 150 °, significantly showing its excellent waterproof effect.

[0049] On the other hand, the present invention also provides a layered design electronic textile prepared by any of the above-mentioned layered design electronic textile preparation methods and its application in visual hyperthermia and motion monitoring. The structure of the layered design electronic textile is as follows Figure 2 As shown, it includes, arranged from top to bottom: a TMs / SEBS layer 1 capable of realizing thermochromic and superhydrophobic self-cleaning functions, a SEBS silver-plated layer 2 realizing electromagnetic shielding function, a Joule heating circuit layer 3 realizing Joule heating function, a SEBS non-woven fabric layer 4 as a base layer, and a strain sensing circuit layer 5 realizing motion monitoring.

[0050] Example 1

[0051] A layered electronic textile is prepared by the following steps:

[0052] (1) 19 wt.% styrene-ethylene-butylene-styrene block copolymer (SEBS) was dissolved in tetrahydrofuran by magnetic stirring to form a transparent viscous solution.

[0053] (2) The solution from step (1) was injected into a syringe and installed in a closed electrospinning chamber for electrospinning. The electrospinning syringe was 10 ml and the needle size was 23 G. The applied voltage, solution propulsion speed and fiber collection distance were set to 15 kV, 1 ml h, and 1 % s, respectively. -1 and 15 cm. The entire electrospinning process was carried out at room temperature. The SEBS fibers were collected on a copper plate. After collection, the SEBS nonwoven fabric was peeled off the copper plate for subsequent use.

[0054] (3) Liquid metal (LM) was sprayed on the surface of SEBS nonwoven fabric using a high-pressure spray gun. Two types of LM circuits, namely Joule heating circuit and strain sensing circuit, were sprayed on both sides of the nonwoven fabric using stainless steel masks with different patterns. The loading amount of LM was about 13 mg cm -2 about.

[0055] (4) The electrospinning solution of step (1) is further deposited onto the Joule heating layer.

[0056] (5) A silver layer of different thickness is plated on the SEBS fiber layer of step (4) by a thermal evaporation device. During the thermal evaporation, the vacuum degree of the vacuum chamber is less than 5×10 -4 Pa, the evaporation rate is controlled at The thickness of the silver layer is 200nm, 300nm, and 400nm respectively.

[0057] (6) Thermochromic microcapsules (TMs) were dispersed in the SEBS solution by magnetic stirring to form a uniform pink viscous solution. The content of the thermochromic microcapsules was 7 wt.% of the weight of SEBS, and they were dispersed in a 15 wt.% SEBS solution.

[0058] (7) The TMs / SEBS solution formed in step (6) is sprayed onto the silver-plated layer formed in step (5) by electrostatic spraying. The electrostatic spraying parameters are the same as those of the electrostatically spun SEBS layer.

[0059] The performance test of the layered electronic textile obtained in the above embodiment is carried out, wherein the results of the change of the surface temperature of the layered electronic textile under different voltages over time are as follows: Figure 3 As shown in the figure, the digital photos and infrared images of wrist hyperthermia before and after applying 1.5V voltage are shown in the figure. Figure 4 As shown in Figure 2, the contact angles of different liquids on textiles are Figure 5 The self-cleaning test results using water flux to remove natural dirt and ketchup are shown in Figure 6 As shown in Figure 2, the electromagnetic interference shielding effect of electronic textiles with different silver layer thicknesses in the X-band is as follows: Figure 7 As shown, the electrical signals of electronic textiles under different degrees of strain are as follows Figure 8 and Fig. 9 shown.

[0060] from Figure 3 It can be seen that when the voltage is between 0.5V and 4V, the temperature can reach 25℃ to 157.5℃. In particular, at a low voltage of 1.5V, a temperature suitable for human hyperthermia (49.50℃) can be generated.

[0061] from Figure 4 It can be seen that the layered electronic textiles can be safely attached to the wrist for thermal therapy. After applying a voltage of 1.5V, the temperature of the fabric reached about 50℃ and the color changed from pink to yellow.

[0062] from Figure 5 It can be seen that the contact angles of water, sodium chloride (1M), sodium hydroxide (1M), hydrochloric acid (1M), milk, cola and beer on the textile surface are all over 150°, and the textile of the present invention has excellent waterproof and anti-corrosion effects.

[0063] from Figure 6 It can be seen that the present invention can use water flux to efficiently remove soil and tomato paste, and the present invention has a good self-cleaning effect.

[0064] from Figure 7 It can be seen that the electromagnetic interference shielding effect increases with the increase of the silver layer thickness. When the silver layer thickness is 200nm, the electromagnetic interference shielding value is 23.64dB, reaching the minimum requirement of 20dB for commercial applications. When the silver layer thickness is 400nm, the shielding value is 34.83dB, reaching the military application requirement of 30dB.

[0065] from Figure 8 and Fig. 9 It can be seen that the layered electronic fabric is capable of monitoring different strain levels from 1% to 150%, and can thus be applied to human body motion monitoring.

[0066] In summary, the present invention successfully integrates multiple functions into electronic fabrics through a layered design method. The electronic fabric of the present invention has precise thermotherapy temperature control and intuitive indication functions, ensuring the safety and effectiveness of the thermotherapy process; the electrostatic spray technology is used to achieve super-hydrophobic self-cleaning properties without using fluorine-containing coatings, making the fabric both green and environmentally friendly and conducive to sustainable development; the addition of motion monitoring function, combined with the thermotherapy effect, is particularly beneficial for the rehabilitation treatment of patients with joint pain, and can help patients better monitor and adjust their motion status during the rehabilitation process, thereby improving the treatment effect. Compared with the prior art, the present invention is a significant improvement.

[0067] The above description is only a representative embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, uses the above-disclosed technical contents to make some changes or modifications to the embodiments are equivalent embodiments of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a layered electronic textile, characterized in that: The following steps are involved: S1: dissolving styrene-ethylene-butylene-styrene block copolymer in a solvent to obtain a SEBS solution; S2: using the SEBS solution to perform electrospinning to obtain a SEBS nonwoven fabric; S3: spraying liquid metal on the SEBS non-woven fabric, wherein the upper surface of the SEBS non-woven fabric is sprayed with the liquid metal for Joule heating circuit, and the lower surface of the SEBS non-woven fabric is sprayed with the liquid metal for strain sensing circuit; S4: depositing the SEBS solution on the upper surface of the SEBS non-woven fabric by electrospinning deposition to obtain a SEBS fiber layer; S5: silver-plating the SEBS fiber layer to obtain a SEBS silver-plated layer; S6: dispersing thermochromic microcapsules in the SEBS solution, mixing them evenly, and then electrostatically spraying them on the SEBS silver-plated layer to obtain a TMs / SEBS layer.

2. The method for preparing the layered-design electronic textile according to claim 1, characterized in that: In step S1, the solvent is tetrahydrofuran, and the concentration of the SEBS solution is 15-20 wt.%.

3. The method for preparing the layered-design electronic textile according to claim 1, characterized in that: In step S2, electrospinning is performed at room temperature. The electrospinning syringe used is 10-20 ml, and the needle size is 23-18G. The applied voltage, solution propulsion speed, and fiber collection distance are set to 15-20 kV, 1-2 ml h, respectively. -1 and 15-20cm.

4. The method for preparing the layered-design electronic textile according to claim 1, characterized in that: In step S3, liquid metal is sprayed on the SEBS non-woven fabric using a high-pressure spray gun.

5. The method for preparing the layered-design electronic textile according to claim 4, characterized in that: The loading amount of the liquid metal is 10-20 mg cm -2 .

6. The method for preparing the layered-design electronic textile according to claim 1, characterized in that: In step S5, silver is plated on the SEBS fiber layer using a thermal evaporation device.

7. The method for preparing the layered-design electronic textile according to claim 6, characterized in that: When performing thermal evaporation, the vacuum degree is less than 5×10 -4 Pa in a vacuum chamber, and the evaporation rate is 8. The method for preparing the layered-design electronic textile according to claim 1, characterized in that: In step S6, the content of the thermochromic microcapsules is 5-10 wt.% of the weight of SEBS.

9. A layered electronic textile, characterized in that: The electronic textile with layered design is prepared by the preparation method of any one of claims 1 to 8.

10. Application of the layered electronic textile as claimed in claim 9 in visualized thermal therapy and motion monitoring.

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