Far infrared light and heat nanometer fabric and preparation method thereof

Abstract

The application discloses a far-infrared light-heat nanometer fabric and a preparation method thereof. The fabric comprises a far-infrared layer and a skin-friendly layer. The textile raw material of the far-infrared layer is polyester fiber filled with nano-heat radiation particles. The nano-heat radiation particles are modified tourmaline particles coated with a polylactic acid layer on the surface. The textile raw material of the skin-friendly layer is light-transmitting yarn. The polylactic acid layer is coated on the surface of the tourmaline particles, thereby improving the biocompatibility of the particles. In combination with a blending spinning technology, the adhesion and stability of the particles on the fiber are significantly improved, and the far-infrared performance of the particles can be maintained for a long time. In addition, the skin-friendly layer is arranged on the inner side of the far-infrared layer, thereby effectively solving the problems of poor comfort and possible allergic reaction caused by the direct contact of the existing far-infrared fabric with the skin. Meanwhile, the skin-friendly layer adopts a specific silk yarn interlacing layer, and the overall far-infrared performance is basically not affected.

Description

Technical Field

[0001] This invention relates to the field of fabric preparation technology, specifically to a far-infrared photothermal nanofiber fabric and its preparation method. Background Technology

[0002] Far-infrared fiber is a typical heat-generating and heat-storing material. Due to the addition of far-infrared additives during the spinning process, it can absorb and store external heat, radiating it back to the human body while simultaneously reflecting far-infrared rays radiated outwards by the body. This results in a warming effect. Furthermore, when far-infrared radiation is absorbed by the body, it can also have certain health benefits. Therefore, the application of far-infrared fibers in the production of thermally insulating clothing fabrics with heat radiation capabilities has been widely researched and applied in recent years, especially in down-filled fabrics. This allows for the reduction of down filling while maintaining warmth, thus achieving lighter garments.

[0003] Existing far-infrared photothermal nano-fabric has poor durability. After prolonged use or multiple washes, its far-infrared performance will decrease due to fiber damage and the shedding of far-infrared additives, affecting the fabric's continued effectiveness.

[0004] Furthermore, to ensure the far-infrared thermal radiation performance of the fabric, it is generally necessary to use the fabric in direct contact with the skin. This is because when far-infrared fiber fabric is in direct contact with the skin, it can minimize the scattering and reflection of far-infrared rays, ensuring that the far-infrared rays are fully absorbed by the skin, thereby achieving optimal warmth and health benefits. However, the far-infrared additives used in existing thermal radiation fabrics include nanoparticles of tourmaline, maifanite, far-infrared ceramics, germanium stone, potassium feldspar, etc. The use of these additives can, on the one hand, reduce the softness of the fibers and result in poor comfort against the skin; on the other hand, prolonged contact with far-infrared fiber fabrics may cause allergic reactions or discomfort for some consumers. Summary of the Invention

[0005] The purpose of this invention is to provide a far-infrared photothermal nanofiber fabric and its preparation method, which solves the problems of poor durability of existing far-infrared photothermal nanofiber fabrics, poor comfort caused by direct skin contact, and possible allergic reactions.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A far-infrared photothermal nanofiber fabric, characterized in that the fabric comprises a far-infrared layer and a skin-friendly layer, wherein the textile raw material of the far-infrared layer is polyester fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles are modified nano-tourmaline particles with a polylactic acid layer on the surface, and the textile raw material of the skin-friendly layer is light-transmitting yarn.

[0008] A further improvement is that the modified tourmaline nanoparticles have a particle size of 50-500 nm.

[0009] A further improvement is that the light-transmitting yarn is silk yarn, and the skin-friendly layer is a vertically interwoven layer of silk yarn. The overlap thickness of the yarn at the interwoven point in the interwoven layer is 1.12-1.36 times the thickness of the yarn at the non-interwoven point. Furthermore, both the inner and outer surfaces of the interwoven layer have a collapsed surface on the yarn that is parallel to the plane of the interwoven layer.

[0010] A further improvement is that the total area of ​​the collapsed surfaces on the same side surface of the interlacing layer accounts for 47.9%-76.2% of the projected area of ​​the interlacing layer.

[0011] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0012] S1. Place nano-tourmaline particles in hydrogen peroxide, stir to react, filter, collect the residue and dry to obtain modified nano-tourmaline particles.

[0013] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add the modified tourmaline nanoparticles to the polylactic acid solution, sonicate, then separate and take the modified tourmaline nanoparticles. After natural evaporation and drying, obtain modified tourmaline nanoparticles with a polylactic acid layer on the surface.

[0014] S3. Take modified tourmaline nanoparticles coated with polylactic acid layer and place them in an organic solvent. Add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Mix the thermal radiation slurry with polyester fiber chips evenly, dry it and melt granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then heat stretch, relax and heat set to obtain thermal radiation fiber. Finally, take the thermal radiation fiber to spin to obtain a far-infrared layer.

[0015] S4. Take translucent yarn and weave it to obtain a skin-friendly layer;

[0016] S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0017] A further improvement is that, in step S1, the amount of hydrogen peroxide used is 5-10 times the weight of the nano-tourmaline particles, and the mass concentration of hydrogen peroxide is 3-5%, with a stirring reaction time of 1-2 hours.

[0018] A further improvement is that, in step S2, the molecular weight of the polylactic acid is 1000-5000, the amount of acetone used is 8-12 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 50-60℃, the time is 20-25 min, the ultrasonic frequency used is 20-25 kHz, and the power is 300-450 W.

[0019] A further improvement is that, in step S3, the mass ratio between the modified tourmaline nanoparticles coated with a polylactic acid layer, the organic solvent, and the dispersant is 1:2-3:0.05-0.1, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:3-8, and the organic solvent is one of ethanol, ethylene glycol, or isopropanol, and the dispersant is one of polyvinylpyrrolidone, sebacic acid, trimethylolethane, polyethylene glycol ester, or phenyl benzoate.

[0020] A further improvement is that the specific process of step S4 is as follows: take silk yarn as warp and weft, and interweave it vertically to obtain an interwoven layer. Then, use two parallel and oppositely moving hot press plates to heat press the interwoven layer, so that the thickness of the yarn overlap at the interlacing point in the interwoven layer is reduced, and both the inner and outer surfaces of the interwoven layer form a collapsed surface on the yarn that is parallel to the plane of the interwoven layer, thus obtaining a skin-friendly layer.

[0021] A further improvement is that the diameter of the silk yarn is 12-16μm, the warp density is 400-450 threads / 10cm, the weft density is 330-370 threads / 10cm, the hot pressing time is 8-12min, and the temperature of the two hot pressing plates is uniformly increased from 60℃ to 100℃ and the pressure is uniformly increased from 1MPa to 3MPa during the hot pressing process.

[0022] The beneficial effects of this invention are as follows:

[0023] (1) This invention improves the biocompatibility of tourmaline particles by coating the surface of the particles with polylactic acid, and, in conjunction with blending spinning technology, significantly enhances the adhesion and stability of the particles on the fibers, thereby reducing particle shedding after long-term use or washing, which helps to maintain the far-infrared performance of the fabric for a long time.

[0024] (2) The present invention provides a skin-friendly layer on the inner side of the far-infrared layer, which effectively solves the problem of poor comfort and possible allergic reactions caused by direct contact with the skin of existing far-infrared fabrics; at the same time, the skin-friendly layer adopts a specific form of silk yarn interwoven layer, which has good light transmittance and can minimize the scattering and reflection of far-infrared rays, ensuring that far-infrared rays are fully absorbed by the skin, so that it will not have a significant impact on the overall far-infrared performance. Detailed Implementation

[0025] The present application will be further described in detail below with reference to specific embodiments. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Example 1

[0027] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0028] S1. Take tourmaline nanoparticles with a particle size of 50±10nm, place them in hydrogen peroxide, stir and react, then filter and dry the residue to obtain modified tourmaline nanoparticles; wherein, the amount of hydrogen peroxide used is 5 times the weight of the tourmaline nanoparticles, the mass concentration of hydrogen peroxide is 3%, and the stirring reaction time is 2h.

[0029] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add the modified tourmaline nanoparticles to the polylactic acid solution, sonicate, then separate the modified tourmaline nanoparticles and allow them to evaporate and dry naturally to obtain modified tourmaline nanoparticles coated with a polylactic acid layer. The molecular weight of the polylactic acid is 1000, the amount of acetone used is 8 times the mass of the polylactic acid, the temperature of the sonication is 50°C, the time is 25 min, the ultrasonic frequency is 20 kHz, and the power is 300 W.

[0030] S3. Modified tourmaline nanoparticles coated with polylactic acid were placed in an organic solvent, and a dispersant was added. After stirring and dispersing, a thermal radiation slurry was obtained. The thermal radiation slurry was mixed evenly with polyester fiber chips, dried, and then melt-granulated to obtain thermal radiation masterbatch. The thermal radiation masterbatch was melt-spun, and then subjected to hot stretching, relaxation, and heat setting to obtain thermal radiation fiber (melt spinning temperature: 270℃, speed: 1000m / min, spinneret diameter: 0.3mm, stretching ratio: 3.3). The temperature during relaxation heat setting is 70℃ (the same below). Finally, heat radiation fiber is spun (warp density is 500 threads / 10cm, weft density is 370 threads / 10cm, the same below) to obtain the far-infrared layer; wherein, the mass ratio between the modified tourmaline nanoparticles coated with polylactic acid layer, organic solvent and dispersant is 1:2:0.05, the mass ratio of heat radiation slurry to polyester fiber chips is 1:3, and the organic solvent is ethanol, and the dispersant is polyvinylpyrrolidone.

[0031] S4. Take silk yarn (purchased from Yingkou Meidian Home Textiles Co., Ltd., the same below) as warp and weft, and interweave it vertically to obtain an interwoven layer. Use two parallel, oppositely moving hot press plates to heat-press the interwoven layer, so that the yarn overlap thickness at the interlacing points in the interwoven layer is reduced, and both the inner and outer surfaces of the interwoven layer have collapsed surfaces parallel to the plane of the interwoven layer on the yarn, to obtain a skin-friendly layer; wherein, the diameter of the silk yarn is 12μm, the warp density is 450 threads / 10cm, the weft density is 370 threads / 10cm, the heat-pressing time is 8min, and the temperature of the two hot press plates is uniformly increased from 60℃ to 100℃ and the pressure is uniformly increased from 1MPa to 3MPa.

[0032] The prepared skin-friendly layer sample was repeatedly cut along the warp direction, and the cut surfaces were observed until a cut was made precisely on a certain warp line, or until a large number of coexisting interlacing and non-interlacing points could be observed in the cross-section. It was found that the thickness of the single-layer yarn at the interlacing point location was reduced, and under the pressure of the hot press plate, a collapsed surface parallel to the plane of the interlacing layer was formed on both the inner and outer sides. Then, using microscopic observation, the cut surface was placed under a microscope, and the magnification was adjusted to clearly observe the cross-sectional shape. The yarn thickness at the interlacing and non-interlacing points in the cross-section was measured using an eyepiece micrometer and an objective micrometer. Additionally, the inner or outer surface of the sample was placed under a microscope, and the total area of ​​the collapsed surface and the projected area of ​​the interlacing layer plane were measured, and the ratio of the total area of ​​the collapsed surface to the projected area of ​​the interlacing layer plane was calculated. The test results showed that the yarn overlap thickness at the interlacing point location in the interlacing layer was 1.36 times the yarn thickness at the non-interlacing point location, and the total area of ​​the collapsed surface on the same side surface of the interlacing layer accounted for 47.9% of the projected area of ​​the interlacing layer plane.

[0033] S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0034] Example 2

[0035] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0036] S1. Take tourmaline nanoparticles with a particle size of 150±10nm, place them in hydrogen peroxide, stir and react, then filter and dry the residue to obtain modified tourmaline nanoparticles; wherein, the amount of hydrogen peroxide used is 8 times the weight of the tourmaline nanoparticles, the mass concentration of hydrogen peroxide is 4%, and the stirring reaction time is 1.5h.

[0037] S2. Polylactic acid is dissolved in acetone to obtain a polylactic acid solution. The modified tourmaline nanoparticles are added to the polylactic acid solution and ultrasonically treated. The modified tourmaline nanoparticles are then separated and dried by natural evaporation to obtain modified tourmaline nanoparticles with a polylactic acid coating on the surface. The molecular weight of the polylactic acid is 3000, the amount of acetone used is 10 times the mass of the polylactic acid, the ultrasonic treatment temperature is 55℃, the time is 22min, the ultrasonic frequency is 22kHz, and the power is 380W.

[0038] S3. Modified tourmaline nanoparticles coated with polylactic acid are placed in an organic solvent, and a dispersant is added. After stirring and dispersing, a thermal radiation slurry is obtained. The thermal radiation slurry is mixed evenly with polyester fiber chips, dried, and then melt-granulated to obtain a thermal radiation masterbatch. The thermal radiation masterbatch is melt-spun, and then thermally stretched, relaxed, and heat-set to obtain thermal radiation fibers. Finally, the thermal radiation fibers are spun to obtain a far-infrared layer. The mass ratio of the modified tourmaline nanoparticles coated with polylactic acid, the organic solvent, and the dispersant is 1:2.5:0.08, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol, and the dispersant is polyethylene glycol ester.

[0039] S4. Silk yarn is used as warp and weft, and interlaced vertically to obtain an interlaced layer. The interlaced layer is then hot-pressed by two parallel, oppositely moving hot press plates. This reduces the overlap thickness of the yarns at the interlacing points and creates a collapsed surface parallel to the plane of the interlaced layer on both the inner and outer surfaces of the interlaced layer, resulting in a skin-friendly layer. The diameter of the silk yarn is 14μm, the warp density is 420 threads / 10cm, and the weft density is 350 threads / 10cm. The hot-pressing time is 10 minutes, and the temperature of the two hot press plates is uniformly increased from 60℃ to 100℃, and the pressure is uniformly increased from 1MPa to 3MPa.

[0040] Referring to the same detection method described above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.22 times the yarn thickness at the non-interlacing point, and the total area of ​​the collapsed surface on the same side of the interlacing layer accounts for 58.3% of the planar projected area of ​​the interlacing layer.

[0041] S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0042] Example 3

[0043] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0044] S1. Take tourmaline nanoparticles with a particle size of 500±10nm, place them in hydrogen peroxide, stir and react, then filter and dry the residue to obtain modified tourmaline nanoparticles; wherein, the amount of hydrogen peroxide used is 10 times the weight of the tourmaline nanoparticles, the mass concentration of hydrogen peroxide is 5%, and the stirring reaction time is 1h.

[0045] S2. Polylactic acid is dissolved in acetone to obtain a polylactic acid solution. The modified tourmaline nanoparticles are added to the polylactic acid solution and ultrasonically treated. The modified tourmaline nanoparticles are then separated and dried by natural evaporation to obtain modified tourmaline nanoparticles with a polylactic acid coating on the surface. The molecular weight of the polylactic acid is 5000, the amount of acetone used is 12 times the mass of the polylactic acid, the ultrasonic treatment temperature is 60℃, the time is 20min, the ultrasonic frequency is 25kHz, and the power is 450W.

[0046] S3. Modified tourmaline nanoparticles coated with polylactic acid are placed in an organic solvent, and a dispersant is added. After stirring and dispersing, a thermal radiation slurry is obtained. The thermal radiation slurry is mixed evenly with polyester fiber chips, dried, and then melt-granulated to obtain a thermal radiation masterbatch. The thermal radiation masterbatch is melt-spun, and then thermally stretched, relaxed, and heat-set to obtain thermal radiation fibers. Finally, the thermal radiation fibers are spun to obtain a far-infrared layer. The mass ratio of the modified tourmaline nanoparticles coated with polylactic acid, the organic solvent, and the dispersant is 1:3:0.1, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:8, and the organic solvent is isopropanol, and the dispersant is phenyl benzoate.

[0047] S4. Silk yarn is used as warp and weft, and interlaced vertically to obtain an interlaced layer. The interlaced layer is then hot-pressed by two parallel, oppositely moving hot press plates. This reduces the overlap thickness of the yarns at the interlacing points and creates a collapsed surface parallel to the plane of the interlaced layer on both the inner and outer surfaces of the interlaced layer, resulting in a skin-friendly layer. The diameter of the silk yarn is 16μm, the warp density is 400 threads / 10cm, and the weft density is 330 threads / 10cm. The hot-pressing time is 12 minutes, and the temperature of the two hot press plates is uniformly increased from 60℃ to 100℃, and the pressure is uniformly increased from 1MPa to 3MPa.

[0048] Referring to the same detection method described above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.12 times the yarn thickness at the non-interlacing point, and the total area of ​​the collapsed surface on the same side of the interlacing layer accounts for 76.2% of the planar projected area of ​​the interlacing layer.

[0049] S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0050] Comparative Example 1

[0051] S1. Take tourmaline nanoparticles with a particle size of 150±10nm and place them in an organic solvent. Add a dispersant and disperse the mixture by stirring to obtain a thermal radiation slurry. Mix the thermal radiation slurry with polyester fiber chips evenly, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then heat-stretch, relax, and heat-set it to obtain thermal radiation fibers. Finally, take the thermal radiation fibers and spin them to obtain a far-infrared layer. The mass ratio of the tourmaline nanoparticles, organic solvent, and dispersant is 1:2.5:0.08, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol and the dispersant is polyethylene glycol ester.

[0052] S2. Silk yarn is used as warp and weft, and interlaced vertically to obtain an interlaced layer. The interlaced layer is then hot-pressed by two parallel, oppositely moving hot press plates. This reduces the overlap thickness of the yarns at the interlacing points and creates a collapsed surface parallel to the plane of the interlaced layer on both the inner and outer surfaces of the interlaced layer, resulting in a skin-friendly layer. The diameter of the silk yarn is 14μm, the warp density is 420 threads / 10cm, and the weft density is 350 threads / 10cm. The hot-pressing time is 10 minutes, and the temperature of the two hot press plates is uniformly increased from 60℃ to 100℃, and the pressure is uniformly increased from 1MPa to 3MPa.

[0053] Referring to the same detection method described above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.23 times the yarn thickness at the non-interlacing point, and the total area of ​​the collapsed surface on the same side of the interlacing layer accounts for 57.8% of the planar projected area of ​​the interlacing layer.

[0054] S3. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0055] Comparative Example 2

[0056] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0057] S1. Polylactic acid is dissolved in acetone to obtain a polylactic acid solution. Nano-tourmaline particles with a particle size of 150±10nm are added to the polylactic acid solution and ultrasonically treated. Then, the nano-tourmaline particles are separated and dried by natural evaporation to obtain nano-tourmaline particles with a polylactic acid coating on the surface. The molecular weight of the polylactic acid is 3000, the amount of acetone used is 10 times the mass of the polylactic acid, the ultrasonic treatment temperature is 55℃, the time is 22min, the ultrasonic frequency is 22kHz, and the power is 380W.

[0058] S2. Take tourmaline nanoparticles coated with polylactic acid and place them in an organic solvent. Add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Mix the thermal radiation slurry with polyester fiber chips evenly, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then heat-stretch, relax and heat-set it to obtain thermal radiation fibers. Finally, take the thermal radiation fibers and weave them to obtain a far-infrared layer. The mass ratio of the tourmaline nanoparticles coated with polylactic acid, the organic solvent and the dispersant is 1:2.5:0.08, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol and the dispersant is polyethylene glycol ester.

[0059] S3. Silk yarn is used as warp and weft, and interlaced vertically to obtain an interlaced layer. The interlaced layer is then hot-pressed by two parallel, oppositely moving hot press plates to reduce the overlap thickness of the yarns at the interlacing points and to create a collapsed surface parallel to the plane of the interlaced layer on both the inner and outer surfaces of the interlaced layer, thus obtaining a skin-friendly layer. The diameter of the silk yarn is 14μm, the warp density is 420 threads / 10cm, the weft density is 350 threads / 10cm, the hot-pressing time is 10min, and the temperature of the two hot press plates is uniformly increased from 60℃ to 100℃ and the pressure is uniformly increased from 1MPa to 3MPa.

[0060] Referring to the same detection method described above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.25 times the yarn thickness at the non-interlacing point, and the total area of ​​the collapsed surface on the same side of the interlacing layer accounts for 56.1% of the planar projected area of ​​the interlacing layer.

[0061] S4. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0062] Comparative Example 3

[0063] A method for preparing a far-infrared photothermal nanofiber fabric, comprising the following steps:

[0064] S1. Take tourmaline nanoparticles with a particle size of 150±10nm, place them in hydrogen peroxide, stir and react, then filter and dry the residue to obtain modified tourmaline nanoparticles; wherein, the amount of hydrogen peroxide used is 8 times the weight of the tourmaline nanoparticles, the mass concentration of hydrogen peroxide is 4%, and the stirring reaction time is 1.5h.

[0065] S2. Polylactic acid is dissolved in acetone to obtain a polylactic acid solution. The modified tourmaline nanoparticles are added to the polylactic acid solution and ultrasonically treated. The modified tourmaline nanoparticles are then separated and dried by natural evaporation to obtain modified tourmaline nanoparticles with a polylactic acid coating on the surface. The molecular weight of the polylactic acid is 3000, the amount of acetone used is 10 times the mass of the polylactic acid, the ultrasonic treatment temperature is 55℃, the time is 22min, the ultrasonic frequency is 22kHz, and the power is 380W.

[0066] S3. Modified tourmaline nanoparticles coated with polylactic acid are placed in an organic solvent, and a dispersant is added. After stirring and dispersing, a thermal radiation slurry is obtained. The thermal radiation slurry is mixed evenly with polyester fiber chips, dried, and then melt-granulated to obtain a thermal radiation masterbatch. The thermal radiation masterbatch is melt-spun, and then thermally stretched, relaxed, and heat-set to obtain thermal radiation fibers. Finally, the thermal radiation fibers are spun to obtain a far-infrared layer. The mass ratio of the modified tourmaline nanoparticles coated with polylactic acid, the organic solvent, and the dispersant is 1:2.5:0.08, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol, and the dispersant is polyethylene glycol ester.

[0067] S4. Take silk yarn as warp and weft, and interweave it vertically to obtain an interlaced layer, which is used as a skin-friendly layer; wherein, the diameter of the silk yarn is 14μm, the warp density is 420 threads / 10cm, and the weft density is 350 threads / 10cm.

[0068] Referring to the same detection method described above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.95 times the yarn thickness at the non-interlacing point, and no collapsed surface is formed on the two sides of the interlacing layer.

[0069] S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

[0070] The far-infrared photothermal nanofiber fabrics prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests:

[0071] (1) Cut the fabric into 10cm×10cm samples and test the far-infrared emissivity and far-infrared irradiation temperature rise of each sample according to the national standard GB-T 30127-2013 "Test and Evaluation of Far-Infrared Properties of Textiles". For general samples, if the far-infrared emissivity of the sample is not less than 0.88 and the far-infrared irradiation temperature rise is not less than 1.4℃, the sample has far-infrared properties.

[0072] (2) The tensile strength of the samples was determined by stress-strain testing using a Q800 Dynamic Mechanical Analyzer (DMA, TA Instruments, Inc., USA). The samples were cut into strips measuring 30 × 10 mm and placed in a tensile fixture, with one end fixed and the other end movable. The temperature was maintained at 20°C, the frequency was set to 1 Hz, and the applied stress was gradually increased from 0 at a rate of 5 MPa / s. The strain change was recorded until the sample fractured, and the stress at the fracture point was taken as the tensile strength of the sample.

[0073] Next, take the far-infrared photothermal nanofiber fabric samples prepared in Examples 1-3 and Comparative Examples 1-3, wash them 30 times in the same manner, and then perform the above tests (1) and (2) again.

[0074] The above test results are summarized in Table 1 below:

[0075] Table 1: Test Results of Far-Infrared Photothermal Nanofabric

[0076]

[0077] As can be seen from Table 1 above, the far-infrared performance of the fabrics prepared in Examples 1-3 of this invention is outstanding, and the performance decline after washing is not significant. The far-infrared emissivity is significantly higher than the 0.88 standard, and the far-infrared irradiation temperature is also significantly higher than the 1.4℃ standard. However, the tourmaline particles used in Comparative Example 1 did not undergo polylactic acid coating, resulting in a significant decrease in the far-infrared performance of the fabric after washing. Comparative Example 2 did not undergo hydrogen peroxide modification before polylactic acid coating, leading to a certain degree of decrease in the far-infrared performance of the fabric after washing. Comparative Example 3 did not undergo hot pressing treatment, which significantly affected the penetration of far-infrared light due to the overlapping yarns at the interlacing points in the skin-friendly layer and the near-circular cross-section of the yarn itself, resulting in a significant decrease in far-infrared performance that does not meet industry standards. This is also the fundamental reason why far-infrared fiber fabrics must be used in direct contact with the skin. In addition, the tensile strength of Examples 1-3 of the present invention also showed good performance. Compared with Comparative Example 1, Example 2 shows that the coating process has a certain promoting effect on the tensile strength of the fabric, which may be due to the improvement of the compatibility inside the fiber. Compared with Comparative Example 3, Example 2 showed no significant difference in tensile strength, which shows that reasonable hot pressing treatment will not have a significant impact on the tensile strength of the fabric.

[0078] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A far-infrared photothermal nanofiber fabric, characterized in that, The fabric includes a far-infrared layer and a skin-friendly layer. The textile raw material used for the far-infrared layer is polyester fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles are modified nano-tourmaline particles with a polylactic acid layer on the surface. The textile raw material for the skin-friendly layer is light-transmitting yarn. The preparation steps of the far-infrared photothermal nanofiber fabric include: S1. Place nano-tourmaline particles in hydrogen peroxide, stir to react, filter, collect the residue and dry to obtain modified nano-tourmaline particles. S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add the modified tourmaline nanoparticles to the polylactic acid solution, sonicate, then separate and take the modified tourmaline nanoparticles. After natural evaporation and drying, obtain modified tourmaline nanoparticles with a polylactic acid layer on the surface. The molecular weight of the polylactic acid is 1000-5000, the amount of acetone used is 8-12 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 50-60℃, the time is 20-25min, the ultrasonic frequency used is 20-25kHz, and the power is 300-450W. S3. Take modified tourmaline nanoparticles coated with polylactic acid layer and place them in an organic solvent. Add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Mix the thermal radiation slurry with polyester fiber chips evenly, dry it and melt granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then heat stretch, relax and heat set to obtain thermal radiation fiber. Finally, take the thermal radiation fiber to spin to obtain a far-infrared layer. The mass ratio of the modified tourmaline nanoparticles coated with polylactic acid, the organic solvent, and the dispersant is 1:2-3:0.05-0.1, the mass ratio of the thermal radiation slurry to the polyester fiber chips is 1:3-8, and the organic solvent is one of ethanol, ethylene glycol, or isopropanol, and the dispersant is one of polyvinylpyrrolidone, sebacic acid, trimethylolethane, polyethylene glycol ester, or phenyl benzoate. S4. Take translucent yarn and weave it to obtain a skin-friendly layer; S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

2. The far-infrared photothermal nanofiber fabric according to claim 1, characterized in that, The modified tourmaline nanoparticles have a particle size of 50-500 nm.

3. The far-infrared photothermal nanofiber fabric according to claim 1, characterized in that, The light-transmitting yarn is silk yarn, and the skin-friendly layer is a vertically interwoven layer of silk yarn. The overlap thickness of the yarn at the interlacing point in the interlacing layer is 1.12-1.36 times that of the yarn at the non-interlacing point. Furthermore, both the inner and outer surfaces of the interlacing layer have collapsed surfaces on the yarn that are parallel to the plane of the interlacing layer.

4. The far-infrared photothermal nanofiber fabric according to claim 3, characterized in that, The total area of ​​the collapsed surfaces on the same side surface of the interlacing layer accounts for 47.9%-76.2% of the projected area of ​​the interlacing layer.

5. A method for preparing far-infrared photothermal nanofiber fabric as described in any one of claims 1-4, characterized in that, step include: S1. Place nano-tourmaline particles in hydrogen peroxide, stir to react, filter, collect the residue and dry to obtain modified nano-tourmaline particles. S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add the modified tourmaline nanoparticles to the polylactic acid solution, sonicate, then separate and take the modified tourmaline nanoparticles. After natural evaporation and drying, obtain modified tourmaline nanoparticles with a polylactic acid layer on the surface. S3. Take modified tourmaline nanoparticles coated with polylactic acid layer and place them in an organic solvent. Add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Mix the thermal radiation slurry with polyester fiber chips evenly, dry it and melt granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then heat stretch, relax and heat set to obtain thermal radiation fiber. Finally, take the thermal radiation fiber to spin to obtain a far-infrared layer. S4. Take translucent yarn and weave it to obtain a skin-friendly layer; S5. Take the far-infrared layer and the skin-friendly layer, and bond them together to obtain the far-infrared photothermal nanofiber fabric.

6. The method for preparing far-infrared photothermal nanofiber fabric according to claim 5, characterized in that, In step S1, the amount of hydrogen peroxide used is 5-10 times the weight of the nano-tourmaline particles, and the mass concentration of hydrogen peroxide is 3-5%, with a stirring reaction time of 1-2 hours.

7. The method for preparing far-infrared photothermal nanofiber fabric according to claim 5, characterized in that, The specific process of step S4 is as follows: take silk yarn as warp and weft, and interweave it vertically to obtain an interwoven layer. Then, use two parallel and oppositely moving hot press plates to heat press the interwoven layer, so that the thickness of the yarn overlap at the interlacing point in the interwoven layer is reduced, and both the inner and outer surfaces of the interwoven layer form a collapsed surface on the yarn parallel to the plane of the interwoven layer, thus obtaining a skin-friendly layer.

8. The method for preparing far-infrared photothermal nanofiber fabric according to claim 7, characterized in that, The diameter of the silk yarn is 12-16μm, the warp density is 400-450 threads / 10cm, and the weft density is 330-370 threads / 10cm. The hot pressing treatment time is 8-12 minutes, and the temperature of the two hot pressing plates is increased from 60℃ to 100℃ at a uniform rate, and the pressure is increased from 1MPa to 3MPa at a uniform rate.

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