Far infrared photothermal nano fabric and preparation method thereof

Abstract

The invention discloses a far infrared thermal nano fabric and a preparation method thereof.The fabric comprises a far infrared layer and a skin-friendly layer, the far infrared layer is made of polyester fibers filled with nano thermal radiation particles, and the nano thermal radiation particles are modified nano tourmaline particles with the surfaces coated with polylactic acid layers; and the textile raw material of the skin-friendly layer is light-transmitting yarns. According to the invention, the surface of the tourmaline particle is coated with the polylactic acid layer, so that the biocompatibility of the particle is improved, and the adhesive force and stability of the particle on the fiber are remarkably improved in cooperation with a blended spinning technology, so that the far infrared performance of the particle can be maintained for a long time. Besides, the skin-friendly layer is arranged on the inner side of the far-infrared layer, so that the problems that an existing far-infrared fabric is not good in comfort and possibly causes anaphylactic reaction due to the fact that the existing far-infrared fabric is in direct contact with the skin for use are effectively solved; and meanwhile, the skin-friendly layer adopts the silk yarn interwoven layer in a specific form, so that the whole far infrared performance is basically not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric preparation, and particularly relates to a far-infrared light-heat nano fabric and a preparation method thereof. Background Art

[0002] Far-infrared fiber is a typical heat storage material for temperature rise. Due to the addition of far-infrared additives during the spinning process, it can absorb external heat and store and radiate it to the human body, while reflecting the far-infrared rays radiated by the human body outward, thereby playing a role in raising the temperature. At the same time, when the far-infrared radiation is absorbed by the human body, it can also play a certain role in promoting physical health. Therefore, the application of far-infrared fibers to process warm clothing fabrics with heat radiation functions has been widely studied and applied in recent years. Especially for down fabric products, it can reduce the down filling amount on the basis of maintaining the warm effect and achieve the lightweight of clothing.

[0003] The existing far-infrared light-heat nano fabrics have poor durability. After long-term use or multiple washes, due to fiber damage and the shedding of far-infrared additives, their far-infrared performance will decline, affecting the continuous use effect of the fabric.

[0004] In addition, in order to ensure the far-infrared heat radiation performance of the fabric, it is generally necessary to use the fabric in direct contact with the skin. The reason is that when the far-infrared fiber fabric is in direct contact with the skin, it can minimize the scattering and reflection of far-infrared rays and ensure that the far-infrared rays are fully absorbed by the skin, thereby exerting the best warming and health care effects. However, the far-infrared additives used in the existing heat radiation fabrics include nano powder particles such as tourmaline, medical stone, far-infrared ceramics, germanium stone, and potassium feldspar. The use of these additives will, on the one hand, reduce the softness of the fiber and the comfort of being close to the body, and on the other hand, for some consumers, long-term contact with the far-infrared fiber fabric may also cause allergic or discomfort reactions. Summary of the Invention

[0005] The purpose of the present invention is to provide a far-infrared light-heat nano fabric and a preparation method thereof, which solve the problems of poor durability of the existing far-infrared light-heat nano fabrics, as well as poor comfort and possible allergic reactions caused by direct contact with the skin.

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

[0007] A far-infrared light-heat nano fabric, characterized in that the fabric comprises 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 heat radiation particles, and the nano heat radiation particles are modified nano tourmaline particles with a polylactic acid layer coated on the surface. The textile raw material of the skin-friendly layer is a light-transmitting yarn.

[0008] A further improvement lies in that the particle size of the modified nano-tourmaline particles is 50 - 500 nm.

[0009] A further improvement lies in that the light-transmitting yarn is a silk yarn, and the skin-friendly layer adopts a vertical interweaving layer of silk yarns. The overlapping thickness of the yarns at the interweaving points in the interweaving layer is 1.12 - 1.36 times the thickness of the yarns at the non-interweaving points, and sunken surfaces parallel to the plane of the interweaving layer are formed on the yarns on both the inner and outer surfaces of the interweaving layer.

[0010] A further improvement lies in that the total area of the sunken surfaces on the same side surface of the interweaving layer accounts for 47.9% - 76.2% of the projected area of the interweaving layer plane.

[0011] A preparation method of a far-infrared light-heat nano fabric, the steps include:

[0012] S1. Take nano-tourmaline particles and place them in hydrogen peroxide, stir and react, then filter to obtain the filter residue and dry it to obtain modified nano-tourmaline particles;

[0013] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Take the modified nano-tourmaline particles and add them to the polylactic acid solution, perform ultrasonic treatment, then separate and take the modified nano-tourmaline particles, and dry them by natural volatilization to obtain modified nano-tourmaline particles with a polylactic acid layer coated on the surface;

[0014] S3. Take the modified nano-tourmaline particles with a polylactic acid layer coated on the surface and place them in an organic solvent, then add a dispersant, stir and disperse to obtain a heat radiation slurry. Take the heat radiation slurry and mix it evenly with polyester fiber chips, dry and then melt granulate to obtain a heat radiation masterbatch. Take the heat radiation masterbatch for melt spinning, then perform hot stretching and relaxation heat setting to obtain heat radiation fibers, and finally take the heat radiation fibers for weaving to obtain a far-infrared layer;

[0015] S4. Take light-transmitting yarns and obtain a skin-friendly layer through weaving;

[0016] S5. Take the far-infrared layer and the skin-friendly layer, and bond them to obtain the far-infrared light-heat nano fabric.

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

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

[0019] Further improvement lies in that in step S3, the mass ratio among the modified nano-tourmaline particles with a polylactic acid layer coated on the surface, 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 selected from one of polyvinylpyrrolidone, sebacic acid, trimethylolethane, polyethylene glycol ester or phenyl benzoate.

[0020] Further improvement lies in that the specific process of step S4 is as follows: Take silk yarn as the warp and weft, vertically interweave to obtain an interwoven layer, and perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and sunken surfaces parallel to the plane of the interwoven layer are formed on the inner and outer surfaces of the interwoven layer on the yarns, thereby obtaining the skin-friendly layer.

[0021] Further improvement lies in that the diameter of the silk yarn is 12 - 16 μm, the warp density of the interweaving is 400 - 450 threads / 10 cm, the weft density is 330 - 370 threads / 10 cm, the time of the hot pressing treatment is 8 - 12 min, and the temperature of the two hot pressing plates during hot pressing rises uniformly from 60 °C to 100 °C, and the pressure rises uniformly from 1 MPa to 3 MPa.

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

[0023] (1) By coating a polylactic acid layer on the surface of tourmaline particles, the present invention improves the biocompatibility of the particles, and in combination with the blend spinning technology, significantly enhances the adhesion and stability of the particles on the fiber, reduces the shedding of the particles after long-term use or washing of the fabric, and helps to maintain its far-infrared performance for a long time.

[0024] (2) A skin-friendly layer is provided inside the far-infrared layer of the present invention, effectively solving the problems of poor comfort and possible allergic reactions caused by the existing far-infrared fabrics when directly contacting the skin; at the same time, the skin-friendly layer adopts an interwoven layer of silk yarns with a specific shape, which has good light transmittance and can minimize the scattering and reflection of far-infrared rays to ensure that the far-infrared rays are fully absorbed by the skin, and basically has no impact on the overall far-infrared performance. Specific embodiments

[0025] The following further describes the present application in detail with specific embodiments. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0026] Example 1

[0027] A preparation method of a far-infrared light-heat nano fabric, the steps including:

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

[0029] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution, take the modified nano tourmaline particles and add them to the polylactic acid solution, perform ultrasonic treatment, then separate and take the modified nano tourmaline particles, and dry them by natural volatilization to obtain modified nano tourmaline particles with a polylactic acid layer coated on the surface; wherein, the molecular weight of the polylactic acid is 1000, the dosage of the acetone is 8 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 50°C, the time is 25min, the ultrasonic frequency used is 20kHz, and the power is 300W.

[0030] S3. Take the modified nano tourmaline particles with a polylactic acid layer coated on the surface and place them in an organic solvent, then add a dispersant, and obtain a heat radiation slurry through stirring and dispersion. Take the heat radiation slurry and mix it evenly with polyester fiber chips, dry and then melt granulate to obtain a heat radiation masterbatch. Take the heat radiation masterbatch for melt spinning, and then perform hot stretching and relaxation heat setting to obtain heat radiation fibers (the melt spinning temperature is 270°C, the speed is 1000m / min, the diameter of the spinneret hole is 0.3mm, the draw ratio during stretching is 3.3, the temperature during relaxation heat setting is 70°C, the same below), and finally take the heat radiation fibers for weaving (the warp density is 500 pieces / 10cm, the weft density is 370 pieces / 10cm, the same below) to obtain a far-infrared layer; wherein, the mass ratio of the modified nano tourmaline particles with a polylactic acid layer coated on the surface, the organic solvent and the dispersant is 1:2:0.05, the mass ratio of the heat radiation slurry to the polyester fiber chips is 1:3, and the organic solvent is ethanol, and the dispersant is selected as polyvinylpyrrolidone.

[0031] S4. Take silk yarns (purchased from Yingkou Meidian Home Textiles Co., Ltd., the same below) as the warp and weft, and obtain an interwoven layer through vertical interweaving. Perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and parallel to the plane of the interwoven layer, sunken surfaces are formed on both the inner and outer surfaces of the interwoven layer on the yarns to obtain a skin-friendly layer; wherein, the diameter of the silk yarns is 12μm, the warp density of the interweaving is 450 pieces / 10cm, the weft density is 370 pieces / 10cm, the time of the hot pressing treatment is 8min, and the temperature of the two hot pressing plates during hot pressing rises uniformly from 60°C to 100°C, and the pressure rises uniformly from 1MPa to 3MPa.

[0032] Take the obtained skin-friendly layer sample, cut it multiple times along the warp direction, observe the cut surface until it is exactly cut on a certain warp thread, or a cross-section with a large number of coexisting interlacing points and non-interlacing points can be observed. It is found that the thickness of the single-layer yarn at the interlacing point position becomes smaller, and under the action of the hot pressing plate pressure, collapse surfaces parallel to the plane of the interlacing layer are formed on both the inner and outer sides. Then, using the microscope observation method, place the cut surface under the microscope, adjust the magnification to clearly observe the cross-sectional shape of the cut surface, and use an eyepiece micrometer and an objective micrometer to measure the yarn thickness at the interlacing point and non-interlacing point positions in the cross-section. In addition, place the inner or outer surface of the sample under the microscope, measure the total area of the collapse surface, as well as the projected area of the interlacing layer plane, and calculate the ratio of the total area of the collapse surface to the projected area of the interlacing layer plane. After testing, the overlapping thickness of the yarn at the interlacing point position in the interlacing layer is 1.36 times the yarn thickness at the non-interlacing point position, and the total area of the collapse surface on the same side surface of the interlacing layer accounts 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 obtain the far-infrared light-heat nano fabric through bonding.

[0034] Example 2

[0035] A preparation method of a far-infrared light-heat nano fabric, the steps include:

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

[0037] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution, add the modified nano tourmaline particles to the polylactic acid solution, perform ultrasonic treatment, then separate to obtain the modified nano tourmaline particles, and dry them by natural volatilization to obtain modified nano tourmaline particles coated with a polylactic acid layer on the surface; wherein, the molecular weight of the polylactic acid is 3000, the dosage of the acetone is 10 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 55 °C, the time is 22 min, and the ultrasonic frequency used is 22 kHz and the power is 380 W.

[0038] S3. Place the modified nano-tourmaline particles with a polylactic acid layer on the surface in an organic solvent, add a dispersant, and obtain a thermal radiation slurry through stirring and dispersion. Mix the thermal radiation slurry evenly with polyester fiber chips, dry and then melt granulate to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then perform hot stretching and relaxation heat setting to obtain thermal radiation fibers. Finally, take the thermal radiation fibers for weaving to obtain a far-infrared layer; wherein, the mass ratio of the modified nano-tourmaline particles with a polylactic acid layer on the surface, 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 selected from polyethylene glycol esters.

[0039] S4. Take silk yarns as warp and weft, and obtain an interwoven layer through vertical interweaving. Perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and sunken surfaces parallel to the plane of the interwoven layer are formed on the yarns on both the inner and outer surfaces of the interwoven layer to obtain a skin-friendly layer; wherein, the diameter of the silk yarns is 14 μm, the warp density of the interweaving is 420 pieces / 10 cm, the weft density is 350 pieces / 10 cm, the time of the hot pressing treatment is 10 min, and the temperature of the two hot pressing plates during hot pressing is uniformly increased from 60 °C to 100 °C, and the pressure is uniformly increased from 1 MPa to 3 MPa.

[0040] Referring to the same detection method above, the overlapping thickness of the yarns at the interweaving points in the interwoven layer is 1.22 times the thickness of the yarns at the non-interweaving points, and the total area of the sunken surfaces on the same side surface of the interwoven layer accounts for 58.3% of the projected area of the plane of the interwoven layer.

[0041] S5. Take the far-infrared layer and the skin-friendly layer, and bond them to obtain a far-infrared light-heat nano fabric.

[0042] Example 3

[0043] A preparation method of a far-infrared light-heat nano fabric, the steps include:

[0044] S1. Place nano-tourmaline particles with a particle size of 500 ± 10 nm in hydrogen peroxide, stir and react, then filter to obtain the filter residue and dry it to obtain modified nano-tourmaline particles; wherein, the dosage of the hydrogen peroxide is 10 times the weight of the nano-tourmaline particles, and the mass concentration of the hydrogen peroxide is 5%, and the stirring reaction time is 1 h;

[0045] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Take the modified nano-tourmaline particles and add them to the polylactic acid solution, then perform ultrasonic treatment. After that, separate and take the modified nano-tourmaline particles, and dry them by natural volatilization to obtain modified nano-tourmaline particles with a polylactic acid layer coated on the surface. Among them, the molecular weight of the polylactic acid is 5000, the amount of acetone used is 12 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 60 °C, the time is 20 min, the ultrasonic frequency used is 25 kHz, and the power is 450 W.

[0046] S3. Take the modified nano-tourmaline particles with a polylactic acid layer coated on the surface and place them in an organic solvent, then add a dispersant, and obtain a heat radiation slurry through stirring and dispersion. Take the heat radiation slurry and mix it evenly with polyester fiber chips, dry and then melt granulate to obtain a heat radiation masterbatch. Take the heat radiation masterbatch for melt spinning, and then perform hot stretching and relaxation heat setting to obtain heat radiation fibers. Finally, take the heat radiation fibers for weaving to obtain a far-infrared layer. Among them, the mass ratio of the modified nano-tourmaline particles with a polylactic acid layer coated on the surface, the organic solvent and the dispersant is 1:3:0.1, the mass ratio of the heat radiation slurry to the polyester fiber chips is 1:8, and the organic solvent is isopropyl alcohol, and the dispersant selected is phenyl benzoate.

[0047] S4. Take silk yarns as warp and weft, and obtain an interwoven layer through vertical interweaving. Perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and sunken surfaces parallel to the plane of the interwoven layer are formed on the yarns on both the inner and outer surfaces of the interwoven layer to obtain a skin-friendly layer. Among them, the diameter of the silk yarn is 16 μm, the warp density of the interweaving is 400 pieces / 10 cm, the weft density is 330 pieces / 10 cm, the time of the hot pressing treatment is 12 min, and the temperature of the two hot pressing plates during hot pressing rises uniformly from 60 °C to 100 °C, and the pressure rises uniformly from 1 MPa to 3 MPa.

[0048] Referring to the same detection method above, the overlapping thickness of the yarns at the interweaving points in the interwoven layer is 1.12 times the thickness of the yarns at the non-interweaving points, and the total area of the sunken surfaces on the same side surface of the interwoven layer accounts for 76.2% of the projected area of the plane of the interwoven layer.

[0049] S5. Take the far-infrared layer and the skin-friendly layer, and bond them to obtain a far-infrared light and heat nano-fabric.

[0050] Comparative Example 1

[0051] S1. Take nano-tourmaline particles with a particle size of 150 ± 10 nm and place them in an organic solvent. Then add a dispersant and stir to disperse to obtain a thermal radiation slurry. Mix the thermal radiation slurry evenly with polyester fiber chips, dry and then melt granulate to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then conduct hot stretching and relaxation heat setting to obtain thermal radiation fibers. Finally, take the thermal radiation fibers for weaving to obtain a far-infrared layer; wherein, the mass ratio of the nano-tourmaline particles, 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 selected as polyethylene glycol ester.

[0052] S2. Take silk yarns as warp and weft, and vertically interweave to obtain an interwoven layer. Conduct hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and sunken surfaces parallel to the plane of the interwoven layer are formed on the yarns on both the inner and outer surfaces of the interwoven layer to obtain a skin-friendly layer; wherein, the diameter of the silk yarns is 14 μm, the warp density of the interweaving is 420 threads / 10 cm, the weft density is 350 threads / 10 cm, the time of the hot pressing treatment is 10 min, and the temperature of the two hot pressing plates during hot pressing is uniformly increased from 60 °C to 100 °C, and the pressure is uniformly increased from 1 MPa to 3 MPa.

[0053] Referring to the same detection method above, the overlapping thickness of the yarns at the interweaving points in the interwoven layer is 1.23 times the thickness of the yarns at the non-interweaving points, and the total area of the sunken surfaces on the same side surface of the interwoven layer accounts for 57.8% of the plane projection area of the interwoven layer.

[0054] S3. Take the far-infrared layer and the skin-friendly layer, and bond them to obtain a far-infrared light-heat nano fabric.

[0055] Comparative Example 2

[0056] A preparation method of a far-infrared light-heat nano fabric, the steps include:

[0057] S1. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add nano-tourmaline particles with a particle size of 150 ± 10 nm to the polylactic acid solution, conduct ultrasonic treatment, and then separate and take the nano-tourmaline particles, and dry by natural volatilization to obtain nano-tourmaline particles coated with a polylactic acid layer on the surface; wherein, the molecular weight of the polylactic acid is 3000, the amount of acetone used is 10 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 55 °C, the time is 22 min, the ultrasonic frequency used is 22 kHz, and the power is 380 W.

[0058] S2. Place the nano-tourmaline particles with a polylactic acid layer on the surface in an organic solvent, add a dispersant, and obtain a heat radiation slurry through stirring and dispersion. Mix the heat radiation slurry evenly with polyester fiber chips, dry and then melt granulate to obtain a heat radiation masterbatch. Take the heat radiation masterbatch for melt spinning, and then perform hot stretching and relaxation heat setting to obtain heat radiation fibers. Finally, take the heat radiation fibers for weaving to obtain a far-infrared layer. Among them, the mass ratio of the nano-tourmaline particles with a polylactic acid layer on the surface, the organic solvent and the dispersant is 1:2.5:0.08, the mass ratio of the heat radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol, and the dispersant is selected from polyethylene glycol esters.

[0059] S3. Take silk yarns as warp and weft, and obtain an interwoven layer through vertical interweaving. Perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so that the overlapping thickness of the yarns at the interweaving points in the interwoven layer is reduced, and sunken surfaces parallel to the plane of the interwoven layer are formed on the yarns on both the inner and outer surfaces of the interwoven layer to obtain a skin-friendly layer. Among them, the diameter of the silk yarn is 14 μm, the warp density of the interweaving is 420 per 10 cm, the weft density is 350 per 10 cm, the time of the hot pressing treatment is 10 min, and the temperature of the two hot pressing plates during hot pressing rises uniformly from 60 °C to 100 °C, and the pressure rises uniformly from 1 MPa to 3 MPa.

[0060] Referring to the same detection method above, the overlapping thickness of the yarns at the interweaving points in the interwoven layer is 1.25 times the thickness of the yarns at the non-interweaving points, and the total area of the sunken surfaces on the same side surface of the interwoven layer accounts for 56.1% of the projected area of the plane of the interwoven layer.

[0061] S4. Take the far-infrared layer and the skin-friendly layer, and obtain a far-infrared light-heat nano-fabric through bonding.

[0062] Comparative Example 3

[0063] A preparation method of a far-infrared light-heat nano-fabric, the steps include:

[0064] S1. Place nano-tourmaline particles with a particle size of 150 ± 10 nm in hydrogen peroxide, stir and react, then filter to obtain the filter residue and dry it to obtain modified nano-tourmaline particles. Among them, the dosage of the hydrogen peroxide is 8 times the weight of the nano-tourmaline particles, and the mass concentration of the hydrogen peroxide is 4%, and the stirring reaction time is 1.5 h;

[0065] S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Add the modified nano-tourmaline particles to the polylactic acid solution, perform ultrasonic treatment, then separate and take the modified nano-tourmaline particles, and dry them by natural volatilization to obtain modified nano-tourmaline particles with a polylactic acid layer coated on the surface. Among them, the molecular weight of the polylactic acid is 3000, the amount of acetone used is 10 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 55 °C, the time is 22 min, the ultrasonic frequency used is 22 kHz, and the power is 380 W.

[0066] S3. Place the modified nano-tourmaline particles with a polylactic acid layer coated on the surface in an organic solvent, and then add a dispersant. After stirring and dispersing, a heat radiation slurry is obtained. Mix the heat radiation slurry with polyester fiber chips evenly, dry them and then melt granulate to obtain a heat radiation masterbatch. Take the heat radiation masterbatch for melt spinning, and then perform hot stretching and relaxation heat setting to obtain heat radiation fibers. Finally, take the heat radiation fibers for weaving to obtain a far-infrared layer. Among them, the mass ratio of the modified nano-tourmaline particles with a polylactic acid layer coated on the surface, the organic solvent and the dispersant is 1:2.5:0.08, the mass ratio of the heat radiation slurry to the polyester fiber chips is 1:5, and the organic solvent is ethylene glycol, and the dispersant selected is polyethylene glycol ester.

[0067] S4. Take silk yarns as warp and weft, and obtain an interwoven layer by vertical interweaving, and use the interwoven layer as the skin-friendly layer. Among them, the diameter of the silk yarn is 14 μm, the warp density of the interweaving is 420 per 10 cm, and the weft density is 350 per 10 cm.

[0068] Referring to the same detection method as above, the overlapping thickness of the yarns at the interweaving points in the interwoven layer is 1.95 times the thickness of the yarns at the non-interweaving points, and no collapse surface is formed on the two side surfaces of the interwoven layer.

[0069] S5. Take the far-infrared layer and the skin-friendly layer, and bond them to obtain a far-infrared light-heat nano fabric.

[0070] Take the far-infrared light-heat nano fabrics prepared in Examples 1-3 and Comparative Examples 1-3, and perform the following performance tests on them:

[0071] (1) Cut the fabric to obtain samples of 10 cm × 10 cm. Refer to the national standard GB-T 30127-2013 "Detection and Evaluation of the Far-infrared Performance of Textiles" to detect the far-infrared emissivity and far-infrared irradiation temperature rise of each sample. For general samples, if the far-infrared emissivity of the sample is not less than 0.88 and the far-infrared radiation temperature rise is not less than 1.4 °C, the sample has far-infrared performance.

[0072] (2) The stress-strain test of the sample was carried out using a Q800 dynamic mechanical analyzer (DMA, TA Instruments, USA) to determine the tensile strength of the sample. The sample was cut into strips with a size of 30×10 mm and placed in a tensile fixture. One end was fixed and the other end could move with the fixture. The temperature was maintained at 20 °C, the frequency was set at 1 Hz, and the stress was gradually increased from 0 value at a rate of 5 MPa / s. The strain change of the sample was recorded until the sample broke, and the stress at the break point was taken as the tensile strength of the sample.

[0073] Then, the far-infrared light-heat nanometer fabric samples prepared in Examples 1-3 and Comparative Examples 1-3 were taken, washed 30 times in the same way, and then the above-mentioned tests (1) and (2) were carried out again.

[0074] The above test results were statistically obtained in Table 1 below:

[0075] Table 1: Test results of far-infrared light-heat nanometer fabric

[0076]

[0077] As can be seen from Table 1 above, the far-infrared properties of the fabrics prepared in Examples 1-3 of the present invention are all very prominent, and the performance degradation after washing is not obvious. 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 °C standard. For the tourmaline particles used in Comparative Example 1, since they were not coated with polylactic acid, the far-infrared properties of the fabric after washing decreased significantly; for Comparative Example 2, since the process of hydrogen peroxide modification was not carried out before polylactic acid coating, the far-infrared properties of the fabric after washing also decreased to a certain extent; for Comparative Example 3, since the hot pressing treatment was not carried out, the overlapping yarns at the intersection position in the skin-friendly layer and the nearly circular cross-section of the yarn itself had an obvious impact on the penetration of far-infrared light, resulting in a significant decrease in far-infrared properties and not meeting the industry standard. Of course, this is also the fundamental reason why the current far-infrared fiber fabric 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. Comparing Example 2 with Comparative Example 1, it shows that the coating process has a certain promoting effect on the tensile strength of the fabric, which may be caused by the improvement of the compatibility inside the fiber; comparing Example 2 with Comparative Example 3, there is no obvious difference in tensile strength, indicating that reasonable hot pressing treatment will not have an obvious impact on the tensile strength of the fabric.

[0078] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A far-infrared light-heat nanometer 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 coated on the surface. The textile raw material of the skin-friendly layer is light-transmitting yarn.

2. The far-infrared light-heat nano fabric according to claim 1, characterized in that The particle size of the modified nano-tourmaline particles is 50 - 500 nm.

3. The far-infrared light-heat nano fabric according to claim 1, characterized in that The light-transmitting yarn is silk yarn, and the skin-friendly layer adopts a vertical interweaving layer of silk yarn. The overlapping thickness of the yarn at the interweaving points in the interweaving layer is 1.12 - 1.36 times the thickness of the yarn at the non-interweaving points, and sunken surfaces parallel to the plane of the interweaving layer are formed on the yarns on both the inner and outer surfaces of the interweaving layer.

4. The far-infrared light-heat nano fabric according to claim 3, characterized in that, The total area of the sunken surfaces on the same side surface of the interweaving layer accounts for 47.9% - 76.2% of the projected area of the interweaving layer plane.

5. A method for preparing the far-infrared light-heat nano fabric according to any one of claims 1-4, characterized in that the steps Including: S1. Place nano-tourmaline particles in hydrogen peroxide, stir and react, then filter to obtain the filter residue and dry it to get modified nano-tourmaline particles; S2. Dissolve polylactic acid in acetone to obtain a polylactic acid solution. Take the modified nano-tourmaline particles and add them to the polylactic acid solution, perform ultrasonic treatment, then separate and take the modified nano-tourmaline particles, and dry them by natural volatilization to obtain modified nano-tourmaline particles with a polylactic acid layer coated on the surface; S3. Place the modified nano-tourmaline particles with a polylactic acid layer coated on the surface in an organic solvent, add a dispersant, stir and disperse to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polyester fiber chips, dry and then melt granulate to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, then perform hot stretching and relaxation heat setting to obtain thermal radiation fibers, and finally take the thermal radiation fibers for weaving to obtain the far-infrared layer; S4. Take the light-transmitting yarn and weave it to obtain the skin-friendly layer; S5. Take the far-infrared layer and the skin-friendly layer and bond them to obtain the far-infrared light-thermal nano fabric.

6. The preparation method of the far-infrared light-heat nano fabric according to claim 5, characterized in that, In step S1, the dosage of the hydrogen peroxide is 5 - 10 times the weight of the nano-tourmaline particles, the mass concentration of the hydrogen peroxide is 3 - 5%, and the stirring reaction time is 1 - 2 h.

7. The preparation method of the far-infrared light-heat nanometer fabric according to claim 5, characterized in that In step S2, the molecular weight of the polylactic acid is 1000 - 5000, the dosage of the acetone is 8 - 12 times the mass of the polylactic acid, the temperature of the ultrasonic treatment is 50 - 60 °C, the time is 20 - 25 min, the ultrasonic frequency used is 20 - 25 kHz, and the power is 300 - 450 W.

8. The preparation method of the far-infrared light-heat nano fabric according to claim 5, characterized in that, In step S3, the mass ratio of the modified nano-tourmaline particles with a polylactic acid layer coated on the surface, 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 isopropyl alcohol, and the dispersant is selected from one of polyvinylpyrrolidone, sebacic acid, trimethylolethane, polyethylene glycol ester or phenyl benzoate.

9. The preparation method of the far-infrared light-heat nano fabric according to claim 5, characterized in that, The specific process of step S4 is as follows: Take silk yarn as the warp and weft, vertically interweave to obtain an interwoven layer, and perform hot pressing treatment on the interwoven layer through two parallel and oppositely moving hot pressing plates, so as to reduce the overlapping thickness of the yarns at the intersection positions in the interwoven layer, and form a collapsed surface parallel to the plane of the interwoven layer on the yarns on both the inner and outer surfaces of the interwoven layer, thereby obtaining a skin-friendly layer.

10. The preparation method of the far-infrared light-heat nano fabric according to claim 9, characterized in that, The diameter of the silk yarn is 12 - 16 μm, the density of the interwoven warp is 400 - 450 threads per 10 cm, the density of the weft is 330 - 370 threads per 10 cm, the time of the hot pressing treatment is 8 - 12 min, and the temperature of the two hot pressing plates during hot pressing rises uniformly from 60 °C to 100 °C, and the pressure rises uniformly from 1 MPa to 3 MPa.

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