A composite fabric for heat preservation through nano-thermal radiation and its manufacturing method

Abstract

This invention discloses a composite fabric for heat insulation with nano-thermal radiation and its manufacturing method. The composite fabric includes a heat-radiating fiber layer as the inner layer and a heat-insulating fiber layer as the outer layer. The heat-radiating fiber layer is made of matrix fiber filled with nano-thermal radiation particles, and these nano-thermal radiation particles have a germanium-shell semi-coated tourmaline structure. The heat-insulating fiber layer is made of hollow polyester fiber filled with nano-insulating particles. This invention uses a germanium-shell semi-coated tourmaline structure as the nano-thermal radiation particles, allowing the far-infrared properties of germanium and tourmaline to be superimposed and complementary. It also improves the dispersion of particles within the fiber, preventing particle stratification or aggregation, ultimately resulting in a high overall far-infrared emissivity and good heating effect for the fabric. The composite fabric of this invention also includes a heat-insulating fiber layer made of hollow polyester fiber filled with nano-insulating particles, further enhancing the overall heat insulation effect of the fabric.

Description

Technical Field

[0001] This invention relates to the field of clothing fabric preparation technology, specifically to a composite fabric with nano-thermal radiation insulation and its manufacturing 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 processing into thermal insulation clothing fabrics with heat radiation capabilities has been widely researched and applied in recent years, especially for down-filled fabrics. This allows for the reduction of down filling while maintaining warmth, thus achieving lighter garments.

[0003] However, most far-infrared additives used in existing heat-radiating fabrics are single substances or direct mixtures of multiple substances, such as one or more of tourmaline, maifanite, far-infrared ceramic powder, germanium stone, and potassium feldspar. These far-infrared additives lack synergistic effects, resulting in low overall far-infrared emissivity and poor heating performance of the fabric. Furthermore, most existing heat-radiating fabrics use a single fiber layer, leading to poor heat retention. Summary of the Invention

[0004] The purpose of this invention is to provide a composite fabric for nano-thermal radiation insulation and its manufacturing method, which solves the problems of low far-infrared emissivity, poor heating and insulation effects of existing thermal radiation fabrics.

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

[0006] A composite fabric for heat insulation by nano-thermal radiation, the composite fabric comprising a heat-radiating fiber layer as an inner layer and a heat-insulating fiber layer as an outer layer, wherein the textile raw material of the heat-radiating fiber layer is a matrix fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles adopt a germanium shell semi-coated tourmaline structure, and the textile raw material of the heat-insulating fiber layer is a hollow polyester fiber filled with nano-insulating particles.

[0007] A further improvement is that the matrix fiber is selected from one of polyester fiber, polyamide fiber, acrylic fiber, polypropylene fiber, or spandex fiber.

[0008] A further improvement is that the nano-insulating particles are selected from nano-silica aerogel particles or nano-polyurethane aerogel particles.

[0009] This invention also provides a method for preparing a composite fabric with nano-thermal radiation insulation, the steps of which include:

[0010] S1. Nano thermal radiation particles with a germanium shell semi-coated tourmaline structure were prepared using nano germanium dioxide powder and nano tourmaline powder as raw materials.

[0011] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with matrix fiber slices, dry it and melt granulate it to obtain 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 weave to obtain a thermal radiation fiber layer.

[0012] S3. Take nano-insulating particles as an online additive component, use polyester melt as the main melt, and set the spinneret hole as a hollow structure to carry out online addition melt spinning, and then obtain hollow polyester fiber through hot stretching, relaxation heat setting, and finally take the hollow polyester fiber to weave to obtain the insulation fiber layer.

[0013] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0014] A further improvement is that the specific process of step S1 is as follows: dissolve nano-germanium dioxide powder in sodium hydroxide solution and adjust the pH of the solution to 6-8 to obtain solution A; disperse nano-tourmaline powder in polyvinylpyrrolidone solution and stir for 6-12 hours to obtain solution B; mix solution A and solution B evenly, add sodium borohydride solution to the mixture, heat to 80-100℃ and react for 10-14 hours; filter the obtained product to obtain filter residue; wash and dry the filter residue, and then sinter it at 750-850℃ for 6-8 hours to obtain nano-thermal radiation particles with a germanium shell fully coated with tourmaline structure; take the nano-thermal radiation particles and remove part of the germanium shell on the particle surface using dry etching technology to obtain nano-thermal radiation particles with a germanium shell partially coated with tourmaline structure.

[0015] A further improvement is that the concentration of the sodium hydroxide solution is 10-14 mol / L, and the ratio of nano-germanium dioxide powder to sodium hydroxide solution is 1g:50-100mL; the concentration of the polyvinylpyrrolidone solution is 0.02-0.05mg / mL, and the ratio of nano-tourmaline powder to polyvinylpyrrolidone solution is 1g:20-50mL; the mass ratio of solution A to solution B is 1:4-6; the concentration of the sodium borohydride solution is 0.1-0.3g / mL, and the mass ratio of sodium borohydride solution to the mixed solution is 1:3-4.

[0016] A further improvement is that the dry etching process uses chlorine and oxygen as etching gases, with a chlorine flow rate of 100-200 sccm, an oxygen flow rate of 5-50 sccm, an etching gas pressure of 50-200 mtorr, a source power of 600-700 W, a bias power of 120-150 W, and an etching time of 3-5 min.

[0017] A further improvement is that, in step S2, the mass ratio between the nano-thermal radiation particles, the organic solvent, and the 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.

[0018] A further improvement is that, in step S2, the melt spinning temperature is 250-280℃, the speed is 800-1500m / min, the spinneret diameter is 0.25-0.4mm, the stretching ratio during stretching is 3.2-3.5, and the temperature during relaxation heat setting is 65-80℃.

[0019] A further improvement is that, in step S3, the mass ratio of nano-insulating particles to polyester melt is 8-15%, the melt spinning temperature is 280-300℃, the speed is 1000-1400m / min, the spinneret cross-section is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm, the stretching ratio during stretching is 3.0-3.4, and the temperature during relaxation heat setting is 80-100℃.

[0020] The beneficial effects of the present invention are as follows: (1) The present invention uses a germanium shell semi-encapsulated tourmaline structure as nano thermal radiation particles, so that the far-infrared properties of germanium and tourmaline are superimposed and complement each other. At the same time, it can also improve the dispersion effect of particles in the fiber, avoid particle stratification or agglomeration, and ultimately make the fabric have a high overall far-infrared emissivity and good heating effect. (2) The composite fabric of the present invention also includes a heat-insulating fiber layer made of hollow polyester fiber filled with nano heat-insulating particles, so that the overall heat-insulating effect of the fabric is outstanding. Detailed Implementation

[0021] 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.

[0022] I. Main Materials

[0023] (1) Nano germanium dioxide powder: purchased from Qinghe County Yaoxie Metal Materials Co., Ltd., with a particle size of 20-50nm and a purity of more than 99.9%.

[0024] (2) Nano-tourmaline powder: purchased from Shijiazhuang Chenghe New Material Technology Co., Ltd., with a particle size of 400-500nm and a density of 3.15g / cm³. 3 .

[0025] (3) Nano silica aerogel particles: purchased from Shandong Jiquan Biotechnology Co., Ltd., with a particle size of 200-240nm.

[0026] (4) Nano-polyurethane aerogel particles: First, mix 100g of diphenylmethane diisocyanate acetone solution with 350g of propylene glycol polyether acetone solution evenly, then add 0.8g of dibutyltin dilaurate, let stand for 12h to obtain gel, then wash with acetone 3 times, and supercritical dry to obtain nano-polyurethane aerogel particles with a particle size of 200-280nm.

[0027] II. Conducting the Experiment

[0028] Example 1

[0029] A composite fabric for heat insulation with nano-thermal radiation, the composite fabric comprising a heat-radiating fiber layer as an inner layer and a heat-insulating fiber layer as an outer layer, wherein the textile raw material of the heat-radiating fiber layer is polyester fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles adopt a germanium shell semi-coated tourmaline structure; the textile raw material of the heat-insulating fiber layer is hollow polyester fiber filled with nano-insulating particles, and the nano-insulating particles adopt nano-silica aerogel particles.

[0030] The preparation steps of this composite fabric are as follows:

[0031] S1. Dissolve nano-germanium dioxide powder in a 10 mol / L sodium hydroxide solution at a ratio of 1 g:50 mL, and adjust the pH of the solution to 6 to obtain solution A; disperse nano-tourmaline powder in a 0.02 mg / mL polyvinylpyrrolidone solution at a ratio of 1 g:20 mL, and stir for 6 hours to obtain solution B; mix solution A and solution B evenly at a mass ratio of 1:4, and add a 0.1 g / mL sodium borohydride solution to the mixture, with a mass ratio of sodium borohydride solution to the mixture of 1:3. Heat to 80℃ to react. After 14 hours, the obtained product was filtered to obtain filter residue. The filter residue was first washed and dried, and then sintered at 750℃ for 8 hours to obtain nano-thermal radiation particles with a germanium shell fully coated with tourmaline structure. The nano-thermal radiation particles were then taken, and part of the germanium shell on the particle surface was removed by dry etching technology to obtain nano-thermal radiation particles with a germanium shell partially coated with tourmaline structure. The etching gas used in the dry etching was chlorine and oxygen, with a chlorine flow rate of 100 sccm, an oxygen flow rate of 5 sccm, an etching pressure of 50 mtorr, a source power of 600 W, a bias power of 120 W, and an etching time of 5 min.

[0032] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polyester fiber chips, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning at a temperature of 250°C, a speed of 800 m / min, and a spinneret diameter of 0.25 mm. Then, take the masterbatch for hot stretching and relaxation heat setting to obtain thermal radiation fibers. The stretching ratio is 3.2, and the relaxation heat setting temperature is 65°C. Finally, take the thermal radiation fibers and spin them to obtain a thermal radiation fiber layer. The mass ratio between nano-thermal radiation particles, organic solvent and dispersant is 1:1.5:0.05, the mass ratio of thermal radiation slurry to polyester fiber chips is 1:3, and the organic solvent is ethanol and the dispersant is polyvinylpyrrolidone.

[0033] S3. Take nano-insulating particles as an online additive component, with polyester melt as the main melt, and the mass ratio of nano-insulating particles to polyester melt is 8%. Set the spinneret orifice to be hollow and perform online melt spinning. The melt spinning temperature is 280℃, the speed is 1000m / min, the spinneret orifice cross-section is annular, with an outer diameter of 0.6mm and an inner diameter of 0.4mm. Then, after hot stretching and relaxation heat setting, hollow polyester fibers are obtained. The stretching ratio is 3.0, and the relaxation heat setting temperature is 80℃. Finally, the hollow polyester fibers are spun to obtain the insulation fiber layer.

[0034] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0035] Example 2

[0036] A composite fabric for heat insulation with nano-thermal radiation, the composite fabric comprising a heat-radiating fiber layer as an inner layer and a heat-insulating fiber layer as an outer layer, wherein the textile raw material of the heat-radiating fiber layer is polyamide fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles adopt a germanium shell semi-coated tourmaline structure; the textile raw material of the heat-insulating fiber layer is hollow polyester fiber filled with nano-insulating particles, and the nano-insulating particles adopt nano-silica aerogel particles.

[0037] The preparation steps of this composite fabric are as follows:

[0038] S1. Dissolve nano-germanium dioxide powder in a 12 mol / L sodium hydroxide solution at a ratio of 1 g:80 mL, and adjust the pH of the solution to 7 to obtain solution A; disperse nano-tourmaline powder in a 0.03 mg / mL polyvinylpyrrolidone solution at a ratio of 1 g:35 mL, and stir for 9 hours to obtain solution B; mix solution A and solution B evenly at a mass ratio of 1:5, and add sodium borohydride solution at a concentration of 0.2 g / mL to the mixture, with a mass ratio of sodium borohydride solution to the mixture of 1:3.5. Heat to 90℃ to react. After 12 hours, the obtained product was filtered to obtain filter residue. The filter residue was first washed and dried, and then sintered at 800℃ for 7 hours to obtain nano-thermal radiation particles with a germanium shell fully encapsulated in tourmaline structure. The nano-thermal radiation particles were then subjected to dry etching technology to remove part of the germanium shell on the particle surface, resulting in nano-thermal radiation particles with a germanium shell partially encapsulated in tourmaline structure. The etching gases used in the dry etching were chlorine and oxygen, with a chlorine flow rate of 150 sccm, an oxygen flow rate of 25 sccm, an etching pressure of 100 mtorr, a source power of 650 W, a bias power of 135 W, and an etching time of 4 min.

[0039] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polyamide fiber chips, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning at a temperature of 260℃, a speed of 1100m / min, and a spinneret diameter of 0.35mm. Then, take it for hot stretching and relaxation heat setting to obtain thermal radiation fibers. The stretching ratio is 3.3, and the relaxation heat setting temperature is 70℃. Finally, take the thermal radiation fibers and spin them to obtain a thermal radiation fiber layer. The mass ratio between nano-thermal radiation particles, organic solvent and dispersant is 1:2:0.08, the mass ratio of thermal radiation slurry to polyamide fiber chips is 1:5, and the organic solvent is ethylene glycol and the dispersant is sebacic acid.

[0040] S3. Take nano-insulating particles as an online additive component, with polyester melt as the main melt, and the mass ratio of nano-insulating particles to polyester melt is 12%. Set the spinneret orifice to be hollow and perform online melt spinning. The melt spinning temperature is 290℃ and the speed is 1200m / min. The cross-section of the spinneret orifice is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm. Then, after hot stretching and relaxation heat setting, hollow polyester fibers are obtained. The stretching ratio is 3.2 and the relaxation heat setting temperature is 90℃. Finally, the hollow polyester fibers are spun to obtain the insulation fiber layer.

[0041] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0042] Example 3

[0043] A composite fabric for heat insulation with nano-thermal radiation, the composite fabric comprising a heat-radiating fiber layer as an inner layer and a heat-insulating fiber layer as an outer layer, wherein the textile raw material of the heat-radiating fiber layer is polypropylene fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles adopt a germanium shell semi-coated tourmaline structure; the textile raw material of the heat-insulating fiber layer is hollow polyester fiber filled with nano-insulating particles, and the nano-insulating particles adopt nano-polyurethane aerogel particles.

[0044] The preparation steps of this composite fabric are as follows:

[0045] S1. Dissolve nano-germanium dioxide powder in a 14 mol / L sodium hydroxide solution at a dosage ratio of 1 g:100 mL, and adjust the pH of the solution to 8 to obtain solution A; disperse nano-tourmaline powder in a 0.05 mg / mL polyvinylpyrrolidone solution at a dosage ratio of 1 g:50 mL, and stir for 12 h to obtain solution B; mix solution A and solution B evenly at a mass ratio of 1:6, and add a 0.3 g / mL sodium borohydride solution to the mixture, with the mass ratio of sodium borohydride solution to the mixture being 1:4. Heat to 100℃ and then... After 10 hours, the obtained product was filtered to obtain filter residue. The filter residue was first washed and dried, and then sintered at 850℃ for 6 hours to obtain nano-thermal radiation particles with a germanium shell fully encapsulated in tourmaline structure. The nano-thermal radiation particles were then subjected to dry etching technology to remove part of the germanium shell on the particle surface, resulting in nano-thermal radiation particles with a germanium shell partially encapsulated in tourmaline structure. The etching gases used in the dry etching were chlorine and oxygen, with a chlorine flow rate of 200 sccm, an oxygen flow rate of 50 sccm, an etching pressure of 200 mtorr, a source power of 700 W, a bias power of 150 W, and an etching time of 3 min.

[0046] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polypropylene fiber chips, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning at a temperature of 280℃, a speed of 1500m / min, and a spinneret diameter of 0.4mm. Then, take it for hot stretching and relaxation heat setting to obtain thermal radiation fibers. The stretching ratio is 3.5, and the relaxation heat setting temperature is 80℃. Finally, take the thermal radiation fibers and spin them to obtain a thermal radiation fiber layer. The mass ratio between nano-thermal radiation particles, organic solvent and dispersant is 1:3:0.1, the mass ratio of thermal radiation slurry to polypropylene fiber chips is 1:8, and the organic solvent is isopropanol and the dispersant is polyethylene glycol ester.

[0047] S3. Nano-insulating particles are used as an online additive component, with polyester melt as the main melt. The mass ratio of nano-insulating particles to polyester melt is 15%. The spinneret is set to a hollow structure, and online melt spinning is performed. The melt spinning temperature is 300℃, the speed is 1400m / min, and the spinneret cross-section is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm. Hollow polyester fibers are then obtained through hot stretching and relaxation heat setting. The stretching ratio is 3.4, and the relaxation heat setting temperature is 00℃. Finally, the hollow polyester fibers are spun to obtain an insulating fiber layer.

[0048] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0049] Comparative Example 1

[0050] A composite fabric for heat insulation with nano-thermal radiation, the composite fabric comprising a heat-radiating fiber layer as an inner layer and a heat-insulating fiber layer as an outer layer, wherein the textile raw material of the heat-radiating fiber layer is polyamide fiber filled with nano-thermal radiation particles, and the nano-thermal radiation particles adopt a germanium-shell-fully-encapsulated tourmaline structure, and the textile raw material of the heat-insulating fiber layer is hollow polyester fiber filled with nano-insulating particles, and the nano-insulating particles adopt nano-silica aerogel particles.

[0051] The preparation steps of this composite fabric are as follows:

[0052] S1. Dissolve nano-germanium dioxide powder in a 12 mol / L sodium hydroxide solution at a dosage ratio of 1 g: 80 mL, and adjust the pH of the solution to 7 to obtain solution A; disperse nano-tourmaline powder in a 0.03 mg / mL polyvinylpyrrolidone solution at a dosage ratio of 1 g: 35 mL, and stir for 9 h to obtain solution B; mix solution A and solution B evenly at a mass ratio of 1:5, and add sodium borohydride solution at a concentration of 0.2 g / mL to the mixture, with the mass ratio of sodium borohydride solution to the mixture being 1:3.5. Heat to 90℃ and react for 12 h. Filter the obtained product to obtain filter residue, wash and dry the filter residue, and then sinter at 800℃ for 7 h to obtain nano-thermal radiation particles with a germanium shell fully coated with tourmaline structure.

[0053] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polyamide fiber chips, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning at a temperature of 260℃, a speed of 1100m / min, and a spinneret diameter of 0.35mm. Then, take it for hot stretching and relaxation heat setting to obtain thermal radiation fibers. The stretching ratio is 3.3, and the relaxation heat setting temperature is 70℃. Finally, take the thermal radiation fibers and spin them to obtain a thermal radiation fiber layer. The mass ratio between nano-thermal radiation particles, organic solvent and dispersant is 1:2:0.08, the mass ratio of thermal radiation slurry to polyamide fiber chips is 1:5, and the organic solvent is ethylene glycol and the dispersant is sebacic acid.

[0054] S3. Take nano-insulating particles as an online additive component, with polyester melt as the main melt, and the mass ratio of nano-insulating particles to polyester melt is 12%. Set the spinneret orifice to be hollow and perform online melt spinning. The melt spinning temperature is 290℃ and the speed is 1200m / min. The cross-section of the spinneret orifice is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm. Then, after hot stretching and relaxation heat setting, hollow polyester fibers are obtained. The stretching ratio is 3.2 and the relaxation heat setting temperature is 90℃. Finally, the hollow polyester fibers are spun to obtain the insulation fiber layer.

[0055] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0056] Comparative Example 2

[0057] A composite fabric for heat radiation insulation using nanotechnology, the composite fabric comprising a heat radiation fiber layer as an inner layer and a heat insulation fiber layer as an outer layer, wherein the textile raw material of the heat radiation fiber layer is polyamide fiber filled with nano heat radiation particles, and the nano heat radiation particles are obtained by mixing nano germanium powder and nano tourmaline powder; the textile raw material of the heat insulation fiber layer is hollow polyester fiber filled with nano heat insulation particles, and the nano heat insulation particles are nano silica aerogel particles.

[0058] The preparation steps of this composite fabric are as follows:

[0059] S1. Take nano-germanium powder and nano-tourmaline powder at a mass ratio of 1:9.3 (this mass ratio is the same as the mass ratio of germanium shell to tourmaline in the germanium shell semi-coated tourmaline nano-thermal radiation particles prepared in step S1 of Example 2; the density of the germanium shell semi-coated tourmaline nano-thermal radiation particles prepared in Example 2 is 3.281 g / cm³). 3 Germanium has a density of 5.35 g / cm³. 3 Tourmaline has a density of 3.15 g / cm³. 3 Therefore, according to the density measurement method, the mass ratio is calculated to be 1:9.3. Direct mixing yields nano-thermal radiation particles.

[0060] S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with polyamide fiber chips, dry it, and then melt-granulate it to obtain a thermal radiation masterbatch. Take the thermal radiation masterbatch for melt spinning at a temperature of 260℃, a speed of 1100m / min, and a spinneret diameter of 0.35mm. Then, take it for hot stretching and relaxation heat setting to obtain thermal radiation fibers. The stretching ratio is 3.3, and the relaxation heat setting temperature is 70℃. Finally, take the thermal radiation fibers and spin them to obtain a thermal radiation fiber layer. The mass ratio between nano-thermal radiation particles, organic solvent and dispersant is 1:2:0.08, the mass ratio of thermal radiation slurry to polyamide fiber chips is 1:5, and the organic solvent is ethylene glycol and the dispersant is sebacic acid.

[0061] S3. Take nano-insulating particles as an online additive component, with polyester melt as the main melt, and the mass ratio of nano-insulating particles to polyester melt is 12%. Set the spinneret orifice to be hollow and perform online melt spinning. The melt spinning temperature is 290℃ and the speed is 1200m / min. The cross-section of the spinneret orifice is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm. Then, after hot stretching and relaxation heat setting, hollow polyester fibers are obtained. The stretching ratio is 3.2 and the relaxation heat setting temperature is 90℃. Finally, the hollow polyester fibers are spun to obtain the insulation fiber layer.

[0062] S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

[0063] III. Performance Testing

[0064] The composite fabrics prepared in Examples 1-3 and Comparative Examples 1-2 were cut into 10cm × 10cm samples. The far-infrared emissivity and far-infrared irradiation temperature rise of each sample were tested according to the national standard GB-T 30127-2013 "Test and Evaluation of Far-Infrared Properties of Textiles". Additionally, the clo value of each sample was tested according to the plate-type constant temperature difference heat dissipation method in the national standard GB / T 11048-1989 "Test Method for Thermal Insulation Performance of Textiles". The test results are summarized in Table 1 below:

[0065] Table 1: Test Results of Far-Infrared Emissivity and Far-Infrared Irradiation Temperature Rise

[0066]

[0067]

[0068] As can be seen from Table 1 above, the composite fabrics prepared in Examples 1-3 of this invention exhibit outstanding far-infrared performance, especially Example 2, which achieved a far-infrared emissivity of 94.0% and a temperature rise of 4.9℃. In contrast, Comparative Example 1, lacking a dry etching step and using nano-thermal radiation particles with a germanium shell fully coated tourmaline structure, showed a far-infrared emissivity reduced to 89.9% and a temperature rise of only 2.8℃. Comparative Example 2, using nano-thermal radiation particles prepared by directly mixing nano-germanium powder and nano-tourmaline powder, achieved a far-infrared emissivity of only 88.6% and a temperature rise of only 2.2℃. This demonstrates that using a germanium shell partially coated tourmaline structure as the nano-thermal radiation particles results in overall far-infrared performance of the fabric that is superior to that of ordinary directly mixed nano-thermal radiation particles. Furthermore, the thermal insulation performance of Examples 1-3 is also superior to that of Comparative Examples 1 and 2.

[0069] 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 composite fabric for heat preservation through nano-thermal radiation, characterized in that, The composite fabric includes a heat-radiating fiber layer as the inner layer and a heat-insulating fiber layer as the outer layer. The textile raw material of the heat-radiating fiber layer is a matrix fiber filled with nano heat-radiating particles, and the nano heat-radiating particles adopt a germanium shell semi-coated tourmaline structure. The textile raw material of the heat-insulating fiber layer is a hollow polyester fiber filled with nano heat-insulating particles. Nanoscale thermal radiation particles with a germanium shell partially coated with tourmaline structure were prepared using nanoscale germanium dioxide powder and nanoscale tourmaline powder as raw materials. The specific process for preparing nanoscale thermal radiation particles with a germanium shell partially coated with tourmaline structure is as follows: Nanoscale germanium dioxide powder was dissolved in sodium hydroxide solution, and the pH of the solution was adjusted to 6-8 to obtain solution A. Nanoscale tourmaline powder was dispersed in polyvinylpyrrolidone solution and stirred for 6-12 hours to obtain solution B. Solution A and solution B were mixed evenly, and sodium borohydride solution was added to the mixture. The mixture was heated to 80-100℃ and reacted for 10-14 hours. The obtained product was filtered to obtain filter residue. The filter residue was first washed and dried, and then sintered at 750-850℃ for 6-8 hours to obtain nanoscale thermal radiation particles with a germanium shell fully coated with tourmaline structure. The nanoscale thermal radiation particles were then subjected to dry etching technology to remove part of the germanium shell on the particle surface to obtain nanoscale thermal radiation particles with a germanium shell partially coated with tourmaline structure.

2. The composite fabric for nano-thermal radiation insulation 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 composite fabric for nano-thermal radiation insulation according to claim 1, characterized in that, The nano-insulating particles are selected from nano-silica aerogel particles or nano-polyurethane aerogel particles.

4. A method for preparing a composite fabric with nano-thermal radiation insulation as described in any one of claims 1-3, characterized in that, step include: S1. Nano thermal radiation particles with a germanium shell semi-coated tourmaline structure were prepared using nano germanium dioxide powder and nano tourmaline powder as raw materials. S2. Take nano-thermal radiation particles and place them in an organic solvent, then add a dispersant and disperse them by stirring to obtain a thermal radiation slurry. Take the thermal radiation slurry and mix it evenly with matrix fiber slices, dry it and melt granulate it to obtain 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 weave to obtain a thermal radiation fiber layer. S3. Take nano-insulating particles as an online additive component, use polyester melt as the main melt, and set the spinneret hole as a hollow structure to carry out online addition melt spinning, and then obtain hollow polyester fiber through hot stretching, relaxation heat setting, and finally take the hollow polyester fiber to weave to obtain the insulation fiber layer. S4. The heat radiation fiber layer and the heat insulation fiber layer are bonded together to obtain a composite fabric with nano-heat radiation insulation.

5. The method for preparing the nano-thermal radiation insulating composite fabric according to claim 4, characterized in that, The concentration of the sodium hydroxide solution is 10-14 mol / L, and the ratio of nano-germanium dioxide powder to sodium hydroxide solution is 1g:50-100mL. The concentration of the polyvinylpyrrolidone solution is 0.02-0.05mg / mL, and the ratio of nano-tourmaline powder to polyvinylpyrrolidone solution is 1g:20-50mL. The mass ratio of solution A to solution B is 1:4-6. The concentration of the sodium borohydride solution is 0.1-0.3g / mL, and the mass ratio of sodium borohydride solution to the mixed solution is 1:3-4.

6. The method for preparing the nano-thermal radiation insulating composite fabric according to claim 4, characterized in that, The dry etching process uses chlorine and oxygen as etching gases, with a chlorine flow rate of 100-200 sccm, an oxygen flow rate of 5-50 sccm, an etching gas pressure of 50-200 mtorr, a source power of 600-700 W, a bias power of 120-150 W, and an etching time of 3-5 min.

7. The method for preparing the nano-thermal radiation insulating composite fabric according to claim 4, characterized in that, In step S2, 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.

8. The method for preparing the nano-thermal radiation insulating composite fabric according to claim 4, characterized in that, In step S2, the melt spinning temperature is 250-280℃, the speed is 800-1500m / min, the spinneret diameter is 0.25-0.4mm, the stretching ratio is 3.2-3.5, and the relaxation heat setting temperature is 65-80℃.

9. The method for preparing the nano-thermal radiation insulating composite fabric according to claim 4, characterized in that, In step S3, the mass ratio of nano-insulating particles to polyester melt is 8-15%, the melt spinning temperature is 280-300℃, the speed is 1000-1400m / min, the spinneret cross-section is annular with an outer diameter of 0.6mm and an inner diameter of 0.4mm, the stretching ratio during stretching is 3.0-3.4, and the temperature during relaxation heat setting is 80-100℃.

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