A thermal insulation and waterproof fabric based on nano-thermal radiation and its preparation method

Abstract

This invention discloses a heat-insulating and waterproof fabric based on nano-thermal radiation and its preparation method. The fabric includes a skin-friendly layer, a heat-insulating layer, and a waterproof layer arranged from the inside out. The skin-friendly layer is a silk yarn interwoven layer, with the yarn overlap thickness at the interlacing points being 1.05-1.30 times the thickness at the non-interlacing points. Furthermore, both the inner and outer surfaces of the interwoven layer have collapsed surfaces parallel to the plane of the interwoven layer formed on the yarns. The heat-insulating layer uses a matrix fiber filled with nano-thermal radiation particles as the textile raw material. This invention effectively solves the problems of poor comfort, potential allergic reactions, and poor waterproofing of existing far-infrared thermal radiation fabrics due to direct skin contact. Simultaneously, the skin-friendly layer uses a specific morphology of silk yarn interwoven layer, which has good light transmittance and minimizes the scattering and reflection of far-infrared rays, ensuring that far-infrared rays are fully absorbed by the skin, thus having virtually no impact on the far-infrared performance of the heat-insulating layer.

Description

Technical Field

[0001] This invention relates to the field of fabric preparation technology, specifically to a heat-insulating and waterproof fabric based on nano-thermal radiation 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] To ensure the far-infrared thermal radiation performance of fabrics, they are generally intended for direct skin contact. This is because direct contact minimizes the scattering and reflection of far-infrared rays, ensuring maximum absorption and optimal warmth and health benefits. However, existing far-infrared additives in thermal radiation fabrics include nanoparticles of tourmaline, maifanite, far-infrared ceramics, germanium, and potassium feldspar. The use of these additives can reduce fiber softness and comfort against the skin. Furthermore, prolonged contact with far-infrared fiber fabrics may cause allergic reactions or discomfort for some consumers. Additionally, existing far-infrared fiber thermal radiation fabrics have poor waterproofing and a short lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a heat-insulating and waterproof fabric based on nano-thermal radiation and its preparation method, which solves the problems of poor comfort, possible allergic reactions, and poor waterproof effect of existing far-infrared thermal radiation fabrics due to direct contact with the skin.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A heat-insulating and waterproof fabric based on nano-thermal radiation includes a skin-friendly layer, a heat-insulating layer, and a waterproof layer arranged sequentially from the inside out. The skin-friendly layer is made of interwoven silk yarns, and the overlap thickness of the yarns at the interlacing points in the interlacing layer is 1.05-1.30 times the thickness of the yarns at the non-interlacing points. Both the inner and outer surfaces of the interlacing layer have collapsed surfaces on the yarns that are parallel to the plane of the interlacing layer. The heat-insulating layer uses a matrix fiber filled with nano-thermal radiation particles as the textile raw material.

[0007] A further improvement is that the total area of ​​the collapsed surfaces on the same side surface of the interlacing layer accounts for 52.1%-78.6% of the projected area of ​​the interlacing layer.

[0008] A further improvement is that the nano-thermal radiation particles are selected from one of the following: tourmaline particles, maifanite particles, far-infrared ceramic particles, germanium particles, and potassium feldspar particles.

[0009] A further improvement is that the matrix fiber is selected from one of polyester fiber, polyamide fiber, acrylic fiber, polypropylene fiber, or spandex fiber.

[0010] A further improvement is that the waterproof layer is made of polyurethane waterproof coating or polytetrafluoroethylene waterproof coating.

[0011] This invention also provides a method for preparing the aforementioned heat-insulating and waterproof fabric based on nano-thermal radiation, comprising the following steps:

[0012] S1. Take silk yarn as warp and weft, and interweave it to obtain an interwoven layer. Use two parallel and oppositely moving hot press plates to heat press the interwoven layer, so that the yarn overlap thickness at the interweaving point is reduced to 1.05-1.30 times the yarn thickness at the non-interweaving point. Also, both the inner and outer surfaces of the interwoven layer have a collapsed surface on the yarn parallel to the plane of the interwoven layer, thus obtaining a skin-friendly layer.

[0013] S2. Take nano-thermal radiation particles and matrix fiber slices, and make them into a thermal insulation layer through spinning and weaving processes;

[0014] S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a waterproof layer to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

[0015] A further improvement is that, in step S1, 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.

[0016] A further improvement is that, in step S1, the hot pressing time is 8-12 minutes, and the temperature of the two hot pressing plates is uniformly increased from 60°C to 100°C, and the pressure is uniformly increased from 1MPa to 3MPa.

[0017] A further improvement is made in the specific process of step S2: nano-thermal radiation particles are placed in an organic solvent, a dispersant is added, and the mixture is stirred and dispersed to obtain a thermal radiation slurry. The thermal radiation slurry is mixed evenly with matrix fiber slices, 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 heat insulation layer.

[0018] A further improvement is that the mass ratio of the nano-thermal radiation particles, organic solvent, and dispersant is 1:1.5-3:0.05-0.1, the mass ratio of the thermal radiation slurry to the matrix fiber slices 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.

[0019] The beneficial effects of this invention are as follows: This invention provides a skin-friendly layer on the inner side of the far-infrared thermal radiation insulation layer and a waterproof layer on the outer side, effectively solving the problems of poor comfort, potential allergic reactions, and poor waterproof effect caused by direct contact with the skin in existing far-infrared thermal radiation 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 has virtually no impact on the far-infrared performance of the insulation layer. Detailed Implementation

[0020] 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.

[0021] Example 1

[0022] A method for preparing a thermally insulating and waterproof fabric based on nano-thermal radiation, comprising the following steps:

[0023] S1. Take silk yarn (purchased from Yingkou Meidian Home Textiles Co., Ltd., the same below) as warp and weft, and interweave it to obtain an interwoven layer. The diameter of the silk yarn is 12μm, the warp density is 450 threads / 10cm, and the weft density is 370 threads / 10cm. Then, the interwoven layer is hot-pressed by two parallel and oppositely moving hot press plates for 8 minutes. The temperature of the two hot press plates is raised from 60℃ to 100℃ at a constant rate, and the pressure is raised from 1MPa to 3MPa at a constant rate. After the hot pressing is completed, the skin-friendly layer is obtained.

[0024] 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 results showed that the yarn overlap thickness at the interlacing point location was 1.30 times that 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 52.1% of the projected area of ​​the interlacing layer plane.

[0025] S2. Tourmaline particles are placed in ethanol, and polyvinylpyrrolidone is added. The mixture is stirred and dispersed to obtain a thermal radiation slurry. The mass ratio of tourmaline particles, ethanol and polyvinylpyrrolidone is 1:1.5:0.05. The thermal radiation slurry is then mixed with polyester fiber chips at a mass ratio of 1:3. After drying, the mixture is melt-granulated to obtain a thermal radiation masterbatch. The thermal radiation masterbatch is then melt-spun and subjected to conventional hot stretching and relaxation heat setting to obtain thermal radiation fibers (melt spinning temperature is 280℃, speed is 1200m / min, spinneret diameter is 0.3mm, stretching ratio is 3.3, relaxation heat setting temperature is 70℃, the same below). Finally, the thermal radiation fibers are spun (warp density is 520 threads / 10cm, weft density is 380 threads / 10cm, the same below) to obtain a thermal insulation layer.

[0026] S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a 0.05mm thick polyurethane waterproof coating to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

[0027] Example 2

[0028] A method for preparing a thermally insulating and waterproof fabric based on nano-thermal radiation, comprising the following steps:

[0029] S1. Take silk yarn as the warp and weft, and interweave it to obtain an interwoven layer. The diameter of the silk yarn is 14μm, the warp density is 420 threads / 10cm, and the weft density is 350 threads / 10cm. Then, the interwoven layer is hot-pressed by two parallel and oppositely moving hot press plates for 10 minutes. The temperature of the two hot press plates is increased from 60℃ to 100℃ at a constant rate, and the pressure is increased from 1MPa to 3MPa at a constant rate. After the hot pressing is completed, the skin-friendly layer is obtained.

[0030] The same method was used to test the yarn overlap thickness at the interlacing point in the interlacing layer, which was 1.14 times that at the non-interlacing point. The total area of ​​the collapsed surface on the same side of the interlacing layer accounted for 60.7% of the planar projected area of ​​the interlacing layer.

[0031] S2. Place far-infrared ceramic particles in ethylene glycol, then add polyvinylpyrrolidone, and disperse by stirring to obtain a thermal radiation slurry. The mass ratio of far-infrared ceramic particles, ethylene glycol, and polyvinylpyrrolidone is 1:2:0.08. Then, mix the thermal radiation slurry with polyamide fiber chips at a mass ratio of 1:6, dry, melt granulate, and obtain thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then obtain thermal radiation fiber through conventional hot stretching, relaxation, and heat setting. Finally, take the thermal radiation fiber and weave it to obtain a heat insulation layer.

[0032] S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a 0.05mm thick polytetrafluoroethylene waterproof coating to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

[0033] Example 3

[0034] A method for preparing a thermally insulating and waterproof fabric based on nano-thermal radiation, comprising the following steps:

[0035] S1. Take silk yarn as the warp and weft, and interweave it to obtain an interwoven layer. The diameter of the silk yarn is 16μm, the warp density is 400 threads / 10cm, and the weft density is 330 threads / 10cm. Then, the interwoven layer is hot-pressed by two parallel and oppositely moving hot press plates for 12 minutes. The temperature of the two hot press plates is raised from 60℃ to 100℃ at a constant rate, and the pressure is raised from 1MPa to 3MPa at a constant rate. After the hot pressing is completed, the skin-friendly layer is obtained.

[0036] The same method was used to test the yarn overlap thickness at the interlacing point in the interlacing layer, which was 1.05 times that at the non-interlacing point. The total area of ​​the collapsed surface on the same side of the interlacing layer accounted for 78.6% of the planar projected area of ​​the interlacing layer.

[0037] S2. Place maifanite particles in isopropanol, then add polyethylene glycol ester, and disperse by stirring to obtain a thermal radiation slurry. The mass ratio of maifanite particles, isopropanol and polyethylene glycol ester is 1:3:0.1. Then, mix the thermal radiation slurry with spandex fiber chips at a mass ratio of 1:8, dry and melt granulate to obtain thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then obtain thermal radiation fiber through conventional hot stretching, relaxation and heat setting. Finally, take the thermal radiation fiber and spin it to obtain the heat insulation layer.

[0038] S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a 0.05mm thick polytetrafluoroethylene waterproof coating to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

[0039] Comparative Example 1

[0040] A method for preparing a thermally insulating and waterproof fabric based on nano-thermal radiation, comprising the following steps:

[0041] S1. Take silk yarn as warp and weft, and interweave it to obtain an interwoven layer. The diameter of the silk yarn is 14μm, the interwoven warp density is 420 threads / 10cm, and the weft density is 350 threads / 10cm. Use the interwoven layer as the skin-friendly layer.

[0042] When tested in the same manner as above, the yarn overlap thickness at the interlacing point in the interlacing layer is 1.97 times that at the non-interlacing point, and no collapse surface is formed on the inner and outer sides of the interlacing layer.

[0043] S2. Place far-infrared ceramic particles in ethylene glycol, then add polyvinylpyrrolidone, and disperse by stirring to obtain a thermal radiation slurry. The mass ratio of far-infrared ceramic particles, ethylene glycol, and polyvinylpyrrolidone is 1:2:0.08. Then, mix the thermal radiation slurry with polyamide fiber chips at a mass ratio of 1:6, dry, melt granulate, and obtain thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning, and then obtain thermal radiation fiber through conventional hot stretching, relaxation, and heat setting. Finally, take the thermal radiation fiber and weave it to obtain a heat insulation layer.

[0044] S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a 0.05mm thick polytetrafluoroethylene waterproof coating to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

[0045] The thermal insulation and waterproof fabrics obtained in Examples 1-3 and Comparative Example 1 were subjected to the following performance tests:

[0046] (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.

[0047] (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.

[0048] The test results above are summarized in Table 1 below:

[0049] Table 1: Test Results of Thermal Insulation and Waterproof Fabric Samples

[0050]

[0051] 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, with far-infrared emissivity of 90.8%, 91.6%, and 92.1%, respectively, all significantly higher than 0.88. Furthermore, the far-infrared irradiation temperature rises are 2.8℃, 3.1℃, and 3.3℃, ​​respectively, also significantly higher than 1.4℃. In contrast, Comparative Example 1, lacking hot-pressing treatment, suffers from significant impacts on far-infrared light penetration due to the overlapping yarns at the interlacing points in the skin-friendly layer and the nearly circular cross-section of the yarns themselves. This results in a significant decrease in far-infrared performance, particularly in temperature rise values ​​that fail to meet industry standards. This is the fundamental reason why far-infrared fiber fabrics must currently be used in direct contact with the skin. Additionally, Examples 1-3 of this invention also exhibit good tensile strength. The differences in tensile strength between the examples are mainly due to the different matrix fibers. Example 2 shows no significant difference in tensile strength compared to Comparative Example 1, indicating that proper hot-pressing treatment does not significantly affect the tensile strength of the fabric.

[0052] 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 thermal insulation and waterproof fabric based on nano-thermal radiation, characterized in that, It includes a skin-friendly layer, a heat-insulating layer, and a waterproof layer arranged sequentially from the inside out. The skin-friendly layer is made of interwoven silk yarn. The thickness of the yarn overlap at the interlacing point is 1.05-1.30 times that at the non-interlacing point. 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. The heat-insulating layer uses textile raw materials that are matrix fibers filled with nano-thermal radiation particles. The total area of ​​the collapsed surfaces on the same side of the interwoven layer accounts for 52.1%-78.6% of the projected area of ​​the interwoven layer, and the nano-thermal radiation particles are far-infrared ceramic particles.

2. The thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 1, characterized in that, The matrix fiber is selected from one of polyester fiber, polyamide fiber, acrylic fiber, polypropylene fiber or spandex fiber.

3. The thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 1, characterized in that, The waterproof layer is made of polyurethane waterproof coating or polytetrafluoroethylene waterproof coating.

4. A method for preparing a thermally insulating and waterproof fabric based on nano-thermal radiation as described in any one of claims 1-3, characterized in that the steps... include: S1. Take silk yarn as warp and weft, and interweave it to obtain an interwoven layer. Use two parallel and oppositely moving hot press plates to heat press the interwoven layer, so that the yarn overlap thickness at the interweaving point is reduced to 1.05-1.30 times the yarn thickness at the non-interweaving point. Also, both the inner and outer surfaces of the interwoven layer have a collapsed surface on the yarn parallel to the plane of the interwoven layer, thus obtaining a skin-friendly layer. S2. Take nano-thermal radiation particles and matrix fiber slices, and make them into a thermal insulation layer through spinning and weaving processes; S3. Adhere the skin-friendly layer and the thermal insulation layer together, and then coat the surface of the thermal insulation layer with a waterproof layer to obtain a thermal insulation and waterproof fabric based on nano-thermal radiation.

5. The method for preparing the thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 4, characterized in that, In step S1, 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.

6. The method for preparing the thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 4, characterized in that, In step S1, the hot pressing process takes 8-12 minutes, and the temperature of the two hot pressing plates increases uniformly from 60°C to 100°C, and the pressure increases uniformly from 1MPa to 3MPa.

7. The method for preparing the thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 4, characterized in that, In the specific process of step S2: nano-thermal radiation particles 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 matrix fiber slices, dried, and then melt-granulated to obtain thermal radiation masterbatch. The thermal radiation masterbatch is melt-spun, and then thermally stretched, relaxed, and heat-set to obtain thermal radiation fiber. Finally, the thermal radiation fiber is spun to obtain a heat insulation layer.

8. The method for preparing the thermal insulation and waterproof fabric based on nano-thermal radiation according to claim 7, characterized in that, The mass ratio of the nano-thermal radiation particles, organic solvent, and dispersant is 1:1.5-3:0.05-0.1, the mass ratio of the thermal radiation slurry to the matrix fiber slices 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.

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