A heat storage and warmth retaining strain sensing composite yarn and its preparation method and application

Abstract

The present invention relates to a heat-storage and warmth-retaining strain-sensing composite yarn, and its preparation method and application, belonging to the technical field of intelligent textiles. The preparation method of the present invention comprises the following steps: S1, impregnating a base yarn in a carbon black slurry to obtain a carbon black yarn; S2, weaving a conductive yarn and a carbon black yarn sequentially on the surface of an elastic yarn to obtain a heat-storage and warmth-retaining strain-sensing composite yarn. The heat-storage and warmth-retaining strain-sensing composite yarn is twisted into strands to prepare heat-storage and warmth-retaining strain-sensing composite yarn strands. The heat-storage and warmth-retaining strain-sensing composite yarn strands have good strain sensing performance. During the stretching process of the heat-storage and warmth-retaining strain-sensing composite yarn strands, the two yarns are deformed, causing their capacitance signals to change, thereby monitoring human body movements. In addition, the heat-storage and warmth-retaining strain-sensing composite yarn can perform heat therapy on patients with joint injuries by applying voltage, thereby alleviating pain.

Description

Technical Field

[0001] The present invention belongs to the technical field of smart textiles, and in particular relates to a heat-storage and warmth-retaining strain-sensing composite yarn and a preparation method and application thereof. Background Art

[0002] Joint injury is a chronic disease and one of the most common forms of sports injury in the world. The main symptoms of joint injury are pain, stiffness, joint instability, joint swelling and muscle weakness, which often lead to patients requiring long-term care and treatment strategies. In order to relieve joint pain in a timely manner, patients with joint injuries usually undergo long-term maintenance at home. Generally speaking, most patients with joint injuries use wearable medical devices with heat storage and warming functions for maintenance, thereby reducing pain in the injured joint and increasing the range of joint motion. Therefore, there is a great market demand for wearable medical devices with heat storage and warming functions. However, most wearable devices with heat storage and warming functions only have the function of thermal therapy for the affected area, and lack monitoring of the movements of patients with joint injuries.

[0003] Functional materials such as polypyrrole, carbon black, carbon nanotubes, graphene, and MXenes are currently being widely used in wearable medical devices for thermal storage and warmth preservation. Interfacial polymerization and impregnation coatings are used to enhance their photothermal or electrothermal conversion capabilities. However, these wearable devices lack real-time motion monitoring capabilities. Chinese patent CN 104902598 A describes a composite yarn with electrothermal functionality fabricated from carbon nanotubes. The specific preparation process involves placing carbon nanotubes around the outer ring of a conventional yarn, providing a conductive connector between the carbon nanotubes and the yarn, and coating the carbon nanotubes with a silver anti-oxidation layer. However, this electrothermal composite yarn lacks the ability to monitor human motion. Chinese patent CN 110499535 A utilizes silver nanowires as a conductive carrier and polyurethane as a spinning substrate. Polyurethane nanofibers are produced by electrospinning a polyurethane spinning solution in a water bath. A silver nanowire dispersion is then atomized and sprayed onto the surface of the polyurethane nanofibers to produce a silver nanowire / polyurethane conductive composite fiber yarn. However, the silver nanowire / polyurethane conductive composite fiber yarn lacks the ability to provide thermal therapy for arthritis patients.

[0004] Regarding the heat storage and warmth preservation functions and flexible strain sensors mentioned above, it can be seen that most of the existing technologies are aimed at research on separate functions, and there are few reports on integrating human motion monitoring and heat storage and warmth preservation into a wearable device. Summary of the Invention

[0005] To address the above-mentioned technical problems, the present invention provides a thermal storage and warmth-retaining strain-sensing composite yarn, as well as its preparation method and application. The thermal storage and warmth-retaining strain-sensing composite yarn is woven from carbon black yarn, conductive yarn, and elastic yarn. The thermal storage and warmth-retaining strain-sensing composite yarn is twisted into strands using a twisting machine to form the thermal storage and warmth-retaining strain-sensing composite yarn strands. The thermal storage and warmth-retaining strain-sensing composite yarn strands exhibit excellent strain sensing performance. During the stretching process, the two yarns deform, causing changes in their capacitance signal, thereby monitoring human movement. Furthermore, the thermal storage and warmth-retaining strain-sensing composite yarn can provide thermal therapy for patients with joint injuries by applying a voltage, thereby alleviating pain.

[0006] The first object of the present invention is to provide a method for preparing a heat storage and warmth retaining strain sensing composite yarn, comprising the following steps:

[0007] S1, dipping the base yarn into the carbon black slurry to obtain the carbon black yarn;

[0008] S2. Weaving the conductive yarn and the carbon black yarn described in S1 on the surface of the elastic yarn in sequence to obtain a heat storage and warmth retaining strain sensing composite yarn.

[0009] In one embodiment of the present invention, in S1, the base yarn is selected from one or more of nylon yarn, polyester yarn and acrylic yarn.

[0010] In one embodiment of the present invention, in S1, the concentration of the carbon black slurry is selected from 1 wt% to 5 wt%.

[0011] In one embodiment of the present invention, in S1, the fineness of the carbon black yarn is selected from 70D-120D.

[0012] Furthermore, the fineness of the carbon black yarn is selected from 70D, 90D or 120D.

[0013] In one embodiment of the present invention, in S2, the conductive yarn is selected from one or more of silver-plated nylon, coated carbon nanotube yarn, coated graphene yarn and metal nanowire; the fineness of the conductive yarn is selected from 100D-280D.

[0014] Furthermore, the fineness of the conductive yarn is selected from 100D, 140D, 200D or 280D.

[0015] In one embodiment of the present invention, in S2, the elastic yarn is selected from one or more of spandex, polyester, acrylic and nylon.

[0016] In one embodiment of the present invention, in S2, the weaving speed during the weaving process is 10rpm-20rpm, and the winding speed is 1m / min-3m / min; the number of spindles of the conductive yarn and the carbon black yarn are both selected from 8, 10, 12, 14 or 16.

[0017] The second object of the present invention is to provide a heat storage and warmth retention strain sensing composite yarn prepared by the method described above.

[0018] The third object of the present invention is to provide a strand: the strand is prepared from the heat-storage and warmth-retaining strain-sensing composite yarn.

[0019] A fourth object of the present invention is to provide a fabric made from the thermal storage and warmth-retaining strain sensing composite yarn strands, wherein the twist of the thermal storage and warmth-retaining strain sensing composite yarn strands is 10T, 15T, or 20T. Because the resistance change of a single thermal storage and warmth-retaining strain sensing composite yarn is small, only two yarns can be twisted together to form a capacitive strain sensor. The mechanism is that twisting the two thermal storage and warmth-retaining composite yarns to form a capacitive strain sensor causes the two thermal storage and warmth-retaining composite yarns to deform during the stretching process, resulting in a change in capacitance.

[0020] The technical solution of the present invention has the following advantages over the prior art:

[0021] (1) The materials used in the heat storage and warmth preservation strain sensing composite yarn of the present invention are simple to prepare, have a wide range of materials to choose from, and have the potential for large-scale industrial production.

[0022] (2) The heat storage and warmth keeping strain sensing composite yarn described in the present invention uses elastic silk as the core yarn, and sequentially weaves an intermediate layer of conductive yarn and an outer layer of carbon black yarn on the surface of the elastic silk. The preparation process is simple, the production cost is low, the process flow is short, and it has the potential for large-scale production.

[0023] (3) The heat storage and warmth retaining strain sensing composite yarn of the present invention has good sensing performance, heat storage performance and electrothermal performance, and the sensing performance of the heat storage and warmth retaining strain sensing composite yarn is characterized by high flexibility, high sensitivity and good stability.

[0024] (4) The heat storage and warmth retaining strain sensing composite yarn fabric of the present invention not only has excellent photothermal conversion and electrothermal performance, but can also accurately monitor human body movements, and can also perform heat therapy on the painful areas of arthritis patients, thereby alleviating the pain of arthritis patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0026] Figure 1This is a flow chart for preparing the heat storage and warmth retaining strain sensing composite yarn of the present invention;

[0027] Figure 2 This is a diagram showing the relative capacitance change of the heat storage and warmth retaining strain sensing composite yarn strands with different twists under different stretching conditions;

[0028] Figure 3 This is a sensitivity diagram of the 15T heat storage and warmth retention strain sensing composite yarn strands of the present invention at different stretching times;

[0029] Figure 4 This is a durability diagram of the 15T heat storage and warmth retention strain sensing composite yarn under cyclic strain;

[0030] Figure 5 This is a temperature change diagram of the 15T heat storage and warmth retention strain sensing composite yarn fabric of the present invention under different voltages;

[0031] Figure 6 This is a temperature change diagram of the 15T heat storage and warmth retaining strain sensing composite yarn fabric of the present invention under the application of 1V voltage in sunlight;

[0032] Figure 7 This is a graph showing changes in relative electrical signals of knee motion when the 15T heat-storage and warmth-retaining strain-sensing composite yarn fabric of the present invention is applied to a human knee before and after 1 hour of thermal therapy;

[0033] Figure 8 This is a graph showing changes in relative electrical signals of elbow movement before and after 1 hour of thermal therapy when the 15T heat-storage and warmth-retaining strain-sensing composite yarn fabric of the present invention is fitted to a human elbow. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0035] In the present invention, unless otherwise specified, the carbon black slurry was purchased from Mitsubishi, model number MA100.

[0036] In the present invention, unless otherwise specified, the fineness of carbon black nylon is 70D.

[0037] In the present invention, unless otherwise specified, the fineness of the silver-plated nylon is 100D.

[0038] Example 1

[0039] Reference Figure 1 As shown, a heat storage and warmth preservation strain sensing composite yarn and its preparation method and application specifically include the following steps:

[0040] (1) Preparation of thermal storage and heat preservation strain sensing composite yarn: Nylon yarn was immersed in a 2wt% carbon black slurry and dried in an oven after 10 minutes to obtain carbon black nylon. Sixteen ingots of conductive yarn, silver-plated nylon and sixteen ingots of carbon black nylon, were wound onto a braiding machine spindle using a winding machine. The silver-plated nylon and carbon black nylon yarns were then placed sequentially into the inner and outer yarn carriers of the braiding machine. The silk threads of the wire carrier on the dial device of the braiding machine are pulled out and fixed on the core shaft one by one, and then the elastic silk spandex is passed through the cylinder at the bottom of the braiding machine through the yarn tensioner and fixed on the winding device together with the silver-plated nylon and carbon black nylon fixed on the core shaft; after the braiding machine is turned on, the silver-plated nylon and carbon black nylon on the wire carrier are woven into the outer layer of spandex through 8-shaped motion and O-shaped rotation motion to form a silver-plated nylon / spandex composite yarn. At this time, the braiding speed of the braiding machine is 10rmp and the winding speed is 2m / min. At the same time, the outermost layer of carbon black nylon is also woven into the outer layer of the silver-plated nylon / spandex composite yarn to form a heat storage and warmth strain sensing composite yarn.

[0041] (2) Preparation of heat-storage and heat-retaining strain-sensing composite yarn strands: The heat-storage and heat-retaining strain-sensing composite yarn bobbin is placed on the stationary hollow tube of the ring twisting machine. Two composite yarns are drawn out from the top of the bobbin, pass through the hollow tube, and then enter the radial holes between the spindle tube and the yarn storage disk. The yarn storage disk rotates with the spindle, and the yarn is twisted one turn with each rotation of the spindle. The two yarns are spirally crossed and tightly wound together, with twists set to 10T, 15T, and 20T, respectively, to obtain heat-storage and heat-retaining strain-sensing composite yarn strands.

[0042] (3) Preparation of heat storage and warmth keeping strain sensing composite yarn fabric: Using machine weaving technology, carbon black nylon is used as warp yarn and heat storage and warmth keeping strain sensing composite yarn is used as weft yarn. 15T heat storage and warmth keeping strain sensing composite yarn strands are punched into one weft every 3 cm to obtain heat storage and warmth keeping strain sensing composite yarn fabric.

[0043] Test Example 1

[0044] The strain sensing performance of the heat storage and warmth retaining strain sensing composite yarn strands with different twists in Example 1 was studied to determine the twist of the heat storage and warmth retaining strain sensing composite yarn strands with the best sensing performance. The 10T, 15T, and 20T heat storage and warmth retaining composite yarn strands in Example 1 were placed on a moving slide, and an LCR digital bridge was connected to one end of the heat storage and warmth retaining composite yarn strands. The network-shaped strain sensing composite yarn was stretched to 70% of its original length at a speed of 100 mm / min. The results are as follows: Figure 2 As shown. Figure 2As can be seen, the 15T thermal storage and warmth strain sensing composite yarn strands exhibit the largest relative electrical signal change, reaching 60%, demonstrating excellent sensing performance. This is because excessive or insufficient twist results in minimal deformation of the thermal storage and warmth strain sensing composite yarn strands during stretching. Therefore, for ease of testing, the 15T thermal storage and warmth strain sensing composite yarn strands were selected for subsequent capacitance signal testing.

[0045] Test Example 2

[0046] The sensing performance of the 15T thermal storage and warmth-keeping strain sensing composite yarn strands of Example 1 was tested. The 15T thermal storage and warmth-keeping composite yarn strands were placed on a movable slide, and one end of the thermal storage and warmth-keeping composite yarn strands was connected to an LCR digital bridge. The network-shaped strain sensing composite yarn was stretched to 70% of its original length at a speed of 100 mm / min, and the capacitance signal change was recorded. The results are shown in Figure 1. Figure 3 As shown, the results are Figure 3 As shown. Figure 3 It can be seen that the sensitivity of the 15T thermal storage and warmth strain sensing composite yarn strands when stretched to 70% is 0.854 and the linearity is 0.962, showing excellent sensitivity.

[0047] Test Example 3

[0048] The 15T heat storage and thermal insulation composite yarn was stretched and released 5000 times at a speed of 100mm / min, and the capacitance signal changes were recorded. The results are as follows: Figure 4 As shown. Figure 4 It can be seen that after 5000 repeated cycles, the relative capacitance change rate of this capacitive strain sensing composite yarn remains basically stable, and still maintains good sensing performance.

[0049] Test Example 4

[0050] The heat storage and warmth performance of the 15T heat storage and warmth strain sensing composite yarn fabric of Example 1 was verified. The 15T heat storage and warmth strain sensing composite yarn fabric was connected to a DC regulated power supply, the power box voltage was set to 1V, and the temperature of the upper layer of the 15T heat storage and warmth strain sensing composite yarn fabric was tested using a thermocouple. The results are as follows: Figure 5 As shown. Figure 5 It can be seen that as the applied voltage increases, the temperature of the 15T thermal storage and warmth strain sensing composite yarn fabric gradually increases, reaching around 75°C at a voltage of 2.5V. The 15T thermal storage and warmth strain sensing composite yarn fabric has excellent electrothermal performance. This is because the carbon black nylon on the surface of the thermal storage and warmth composite yarn has excellent heat absorption properties and the thermal storage and warmth composite yarn has excellent electrothermal performance.

[0051] Test Example 5

[0052] The photothermal and electrothermal properties of the 15T thermal storage and warmth strain sensing composite yarn fabric were verified. The 15T thermal storage and warmth strain sensing composite yarn fabric was placed in the sun and a 1V voltage was applied. The temperature change on the surface of the 15T thermal storage and warmth strain sensing composite yarn fabric was monitored with a thermocouple. The results are as follows: Figure 6 As shown. Figure 6 It can be seen that the temperature of the thermal storage and warmth strain sensing composite yarn fabric under an applied voltage of 1 V is still 11.2°C higher than the ambient temperature after one day outdoors. The thermal storage and warmth strain sensing composite yarn fabric has good photothermal and electrothermal properties.

[0053] Test Example 6

[0054] The 15T heat-storage and warmth-retaining strain-sensing composite yarn fabric of Example 1 was used to monitor the movements of arthritis patients before and after heat therapy to test whether the heat-storage and warmth-retaining strain-sensing composite yarn fabric can relieve pain in arthritis patients through heat therapy. The 15T heat-storage and warmth-retaining strain-sensing composite yarn woven fabric was applied to the knees and arm joints of arthritis patients, and electrical signals generated by the joints before and after heat therapy were collected. Figure 7-8 As shown. Figure 7-8 It can be seen that the range of motion of arthritis patients becomes wider before and after heat therapy, which shows that the 15T heat storage and warmth strain sensing composite yarn woven fabric has excellent heat storage and warmth performance, can relieve the pain of arthritis patients, and has broad application prospects.

[0055] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing a heat storage and warmth retaining strain sensing composite yarn, characterized in that: The following steps are included: S1, dipping the base yarn into the carbon black slurry to obtain the carbon black yarn; S2. Using elastic silk as the core yarn, weave the middle layer of conductive yarn and the outer layer of carbon black yarn on the surface of the elastic silk in sequence to obtain a heat storage and warmth preservation strain sensing composite yarn.

2. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S1, the base yarn is selected from one or more of nylon yarn, polyester yarn and acrylic yarn.

3. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S1, the concentration of the carbon black slurry is selected from 1wt% to 5wt%.

4. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S1, the fineness of the carbon black yarn is selected from 70D-120D.

5. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S2, the conductive yarn is selected from one or more of silver-plated nylon, coated carbon nanotube yarn, coated graphene yarn and metal nanowire; the fineness of the conductive yarn is selected from 100D-280D.

6. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S2, the elastic yarn is selected from one or more of spandex, polyester, acrylic and nylon.

7. The method for preparing the heat storage and warmth retaining strain sensing composite yarn according to claim 1, characterized in that: In S2, the weaving speed during the weaving process is 10 rpm-20 rpm, and the winding speed is 1 m / min-3 m / min; the number of spindles of the conductive yarn and the carbon black yarn are both selected from 8, 10, 12, 14 or 16.

8. A heat storage and warmth retaining strain sensing composite yarn prepared by the method according to any one of claims 1 to 7.

9. A strand: characterized in that, The strands are prepared from the heat-storage and warmth-retaining strain-sensing composite yarn according to claim 8.

10. A fabric, characterized in that: The fabric is prepared from the heat-storage warmth-keeping strain-sensing composite yarn strands according to claim 9, and the twist of the heat-storage warmth-keeping strain-sensing composite yarn strands is 10T, 15T or 20T.

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