A warm and healthy composite fabric and a preparation method thereof

Abstract

This invention discloses a thermal and health-promoting composite fabric and its preparation method, belonging to the field of functional fabric technology. First, fumed silica and graphene oxide hydrogel are combined to prepare a mixed aerogel. The mixed aerogel is then combined with propylene trichlorosilane, and maleic anhydride is grafted onto the macromolecular chain of polypropylene, improving compatibility and reducing agglomeration. Next, tourmaline is calcined and then directly quenched and hydrated for modification. The Si-OH groups on the surface combine with the active groups in the polyester molecular chain, resulting in hollow fibers. The mixed aerogel can absorb the far-infrared emitted by the modified tourmaline, and the aerogel that absorbs far-infrared rays can generate a resonance effect and a warming effect, penetrating deep into the skin. The modified tourmaline has the ability to generate negative ions, and with the addition of seagull stone powder, it works together to achieve an antibacterial effect by disrupting the structure of bacteria, thus achieving health benefits. The composite fabric prepared by this invention has both thermal and health-promoting effects.

Description

Technical Field

[0001] This invention relates to the field of functional fabric technology, specifically to a thermal and health-care composite fabric and its preparation method. Background Technology

[0002] As people's material and cultural living standards improve, their demands for fabrics are also increasing. They not only require warmth and aesthetics but also place greater emphasis on comfort and functionality. Functional textiles are becoming one of the future development trends of the textile industry, and will form a major trend in the future of textiles alongside fine denier fiber textiles, non-woven fabrics, composite materials, and environmentally friendly materials. Researching and producing functional fabric products that are beneficial to human ecology and health has become a global trend.

[0003] Tourmaline powder is obtained by mechanically crushing raw tourmaline ore after removing impurities. In the textile industry, tourmaline powder can be used to make environmentally friendly carbon cloth. Ultrafine tourmaline powder can be made into microfibers, which can be used to produce anti-magnetic, moisture-proof, and warm quilts, mattresses, anti-electromagnetic radiation shirts, vests, insoles, etc. It can also be used in rock baths, saunas, light wave rooms, and other sauna facilities, as well as in environmentally friendly home decoration. Currently, the application of tourmaline powder in the research and development of warm polyester fabrics is a promising direction with significant development and application potential. Summary of the Invention

[0004] The purpose of this invention is to provide a thermal and health-preserving composite fabric and its preparation method, so as to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a thermal and health-care composite fabric, wherein the fabric is woven from modified polypropylene fiber and modified polyester hollow fiber.

[0006] Furthermore, the modified polypropylene fiber is prepared by mixing fumed silica and graphene to form a mixed aerogel, which is then combined with propylene trichlorosilane and spun into polypropylene by grafting maleic anhydride.

[0007] Furthermore, the modified polyester hollow fiber is obtained by blending and spinning modified tourmaline powder, seagull stone powder and polyester.

[0008] Furthermore, a method for preparing a thermal insulation and health-care composite fabric includes the following preparation steps:

[0009] (1) Add dried graphene oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL, then add fumed silica. The molar ratio of graphene oxide to fumed silica is 1-5:1. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min to prepare a mixed dispersion. Then flash freeze the mixed dispersion in liquid nitrogen, and then dry the frozen mixed dispersion in a vacuum for 24 h at a vacuum degree of -0.085 MPa to prepare a mixed aerogel.

[0010] (2) Add 8-9.6 parts of polypropylene, 0.5-1.5 parts of propylene-based trichlorosilane, 0.5-1.5 parts of maleic anhydride, 0.001-0.002 parts of catalyst, and 0.4-1.8 parts of mixed aerogel to a high-speed stirrer. First, stir at a low speed of 60-120 rpm for 5-15 minutes, then stir at a high speed of 400-800 rpm for 15-25 minutes, keeping the stirring temperature at 100℃ to ensure uniform mixing of all raw materials. Then, feed the mixture into a reactive twin-screw extruder and extrude the mixture. At a temperature of 200-230℃, after melting and mixing, the mixture is extruded, drawn into strands, and granulated to obtain blended granules. The blended granules are then fed into a spinning screw extruder, where the molten material is extruded into melt fibers through a spinneret with 24 orifices. The fibers are then cooled by a cooling air blower at a temperature of 30℃, stretched by hot rollers at a temperature of 50-90℃ with a stretch ratio of 1.5-3.0, and finally wound into shape on a winding machine at a winding speed of 1500-3000 m / min to obtain modified polypropylene fibers.

[0011] (3) Place tourmaline powder in a fluoropolymer furnace, heat it to 500-700℃, and continue to calcine for more than 4 hours; quickly place the calcined tourmaline powder in a magnesium hydroxide aqueous solution with a pH of 10-11, with a solid-liquid ratio of 1:5-20, soak for 1-3 hours, then filter to obtain the solid, wash repeatedly with water until the filtrate is acid-base neutral, filter and let stand for aging for 12-24 hours, and then place it in a 60℃ oven to dry until the moisture content is less than 10% to obtain modified tourmaline powder;

[0012] (4) Add 6-9 parts of conventional polyester chips, 0.5-1.5 parts of modified tourmaline powder, 0.5-1 parts of 20nm particle size seagull stone powder, and 0.2-0.7 parts of ethyl acetate to a high-speed stirrer and stir at 500rpm for 30min, keeping the stirring temperature at 220℃ to ensure uniform mixing of all raw materials. Then, feed the mixture into a reactive twin-screw extruder at a screw extrusion temperature of 250-270℃. After melt mixing, extrude, stretch, and pelletize to obtain polyester masterbatch. Blend conventional polyester chips and polyester masterbatch together and melt spin at a spinning temperature of 290℃ and a spinning speed of 2600m / min using a "C" type microporous spinneret to obtain modified polyester hollow fiber. Mix modified polypropylene fiber and modified polyester hollow fiber at a mass ratio of 1:0.5-2 to weave a composite fabric.

[0013] Furthermore, the quick-freezing temperature in step (1) is -40°C.

[0014] Furthermore, the catalyst in step (2) is benzoyl peroxide.

[0015] Furthermore, in step (2), the screw extrusion temperature is 190-250℃.

[0016] Furthermore, the heating rate in step (3) is 5-10℃ / min.

[0017] Furthermore, in step (4), the mass ratio of conventional polyester chips to polyester masterbatch is 1:1.

[0018] Furthermore, in step (4), the fabric weight is 150-200 g / m². 2 .

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] This invention uses a mixture of aerogel-modified polypropylene fibers, modified tourmaline and seagull stone powder-modified polyester hollow fibers, and composites them to weave into fabrics to achieve warmth and health benefits.

[0021] First, fumed silica has stronger surface activity than ordinary silica, is rich in silanol and siloxy groups, and already has a porous structure with a three-dimensional network. When combined with graphene oxide aerogel, the siloxy groups on the surface of fumed silica combine with the hydroxyl groups of graphene oxide hydrogel to prepare a hybrid aerogel, which greatly improves the warmth retention of the fabric. The hybrid aerogel is then combined with propylene trichlorosilane and grafted onto the macromolecular chain of polypropylene via maleic anhydride, which not only improves the compatibility between the aerogel and polypropylene but also solves the problem of aerogel aggregation.

[0022] Secondly, by calcining tourmaline followed by quenching and hydration modification, not only are the number of groups in the crystal capable of generating high-frequency infrared vibrations increased, but the lattice distortion caused by rapid cooling also enhances the radiation of high-frequency short-wave infrared rays. Furthermore, the Si-OH groups on the surface of tourmaline combine with the active groups in the polyester molecular chain, spinning them into hollow fibers. The graphene oxide and silicon dioxide in the aerogel absorb the far-infrared rays emitted by the modified tourmaline, improving utilization. The aerogel, by absorbing far-infrared rays, also generates resonance and warming effects, penetrating deep into the skin to promote blood circulation, enhance immune function, and achieve health benefits. Modified tourmaline has the ability to generate negative ions, and when combined with seagull stone powder, it achieves an antibacterial effect by disrupting the structure of bacteria. The human body, through the absorption of far-infrared rays, negative ions, and mineral elements released by tourmaline and negative ion powder, promotes the metabolism of harmful substances in the skin, improves skin elasticity, and promotes blood circulation and metabolism throughout the body, thus achieving health benefits. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of a thermal insulation and health-care composite fabric produced in the following embodiments are as follows:

[0025] Warmth retention: The warmth retention of the sample fabric was tested according to GB / T11048-2008-T "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions for physiological comfort".

[0026] Health benefits: Far-infrared performance tests were conducted on the sample fabric.

[0027] Example 1

[0028] (1) Add dried graphene oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL, then add fumed silica. The molar ratio of graphene oxide to fumed silica is 1:1. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min to prepare a mixed dispersion. Then flash freeze the mixed dispersion in liquid nitrogen at a temperature of -40℃. Then dry the frozen mixed dispersion in a vacuum for 24 h at a vacuum degree of -0.085 MPa to prepare a mixed aerogel.

[0029] (2) 8 parts polypropylene, 0.5 parts propylene trichlorosilane, 0.5 parts maleic anhydride, 0.001 parts benzoyl peroxide catalyst, and 0.4 parts mixed aerogel were put into a high-speed stirrer. The stirrer was first stirred at a low speed of 60 rpm for 5 min, and then stirred at a high speed of 400 rpm for 15 min. The stirring temperature was controlled at 100℃ to ensure that the raw materials were mixed evenly. The mixture was then put into a reactive twin-screw extruder with a screw extrusion temperature of 200℃. After melting and mixing, the mixture was extruded, stretched, and pelletized to obtain blended particles. The blended particles were then put into a spinning screw extruder with a screw extrusion temperature of 190℃. The molten material was extruded into melt fibers through a spinneret with 24 holes. The fibers were then cooled by a cooling air blower at 30℃, stretched by a hot roller at 50℃ with a stretching ratio of 1.5, and finally wound into shape on a winding machine at a winding speed of 1500 m / min to obtain modified polypropylene fibers.

[0030] (3) Place the tourmaline powder in a fluoropolymer furnace and heat it to 500°C at a rate of 5°C / min, and continue to calcine for more than 4 hours. Then, quickly place the calcined tourmaline powder in a magnesium hydroxide aqueous solution with a pH of 10, with a solid-liquid ratio of 1:5, soak for 1 hour, then filter to obtain the solid. After repeated washing with water until the filtrate is acid-base neutral, filter and let it stand for aging for 12 hours. Then, place it in a 60°C oven to dry until the moisture content is less than 10% to obtain modified tourmaline powder.

[0031] (4) Add 6 parts of conventional polyester chips, 0.5 parts of modified tourmaline powder, 0.5 parts of 20nm particle size seagull stone powder, and 0.2 parts of ethyl acetate to a high-speed mixer and stir at 500 rpm for 30 min, keeping the stirring temperature at 220℃ to ensure uniform mixing of all raw materials. Then, feed the mixture into a reactive twin-screw extruder at a screw extrusion temperature of 250℃. After melt mixing, extrude, draw, and pelletize to obtain polyester masterbatch. Blend conventional polyester chips and polyester masterbatch at a mass ratio of 1:1 and melt spin at a spinning temperature of 290℃ and a spinning speed of 2600 m / min using a "C" type microporous spinneret to obtain modified polyester hollow fiber. Mix modified polypropylene fiber and modified polyester hollow fiber at a mass ratio of 1:0.5 to produce a product with a basis weight of 150 g / m². 2 Composite fabric.

[0032] Example 2

[0033] (1) Add dried graphene oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL, then add fumed silica. The molar ratio of graphene oxide to fumed silica is 3:1. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min to form a mixed dispersion. Then flash freeze the mixed dispersion in liquid nitrogen at a temperature of -40℃. Then dry the frozen mixed dispersion in a vacuum for 24 h at a vacuum degree of -0.085 MPa to form a mixed aerogel.

[0034] (2) 8.8 parts of polypropylene, 1 part of propylene trichlorosilane, 1 part of maleic anhydride, 0.0015 parts of benzoyl peroxide catalyst and 1.1 parts of mixed aerogel were put into a high-speed stirrer. The stirrer was first stirred at a low speed of 90 rpm for 10 min, and then stirred at a high speed of 600 rpm for 20 min. The stirring temperature was controlled at 100℃ to ensure that the raw materials were mixed evenly. Then the mixture was put into a reactive twin-screw extruder with a screw extrusion temperature of 215℃. After melting and mixing, the mixture was extruded, drawn into strips and granulated to obtain blended particles. The blended particles were then put into a spinning screw extruder with a screw extrusion temperature of 220℃. The molten material was extruded into melt fibers through a spinneret with 24 holes. The fibers were then cooled by a cooling air blower at a temperature of 30℃ and stretched by a hot roller at a temperature of 70℃ with a stretch ratio of 2.25. Finally, the fibers were wound into shape on a winding machine with a winding speed of 2250 m / min to obtain modified polypropylene fibers.

[0035] (3) Place the tourmaline powder in a fluoropolymer furnace and heat it to 600°C at a rate of 7.5°C / min. Then continue to calcine for more than 4 hours. Place the calcined tourmaline powder in a magnesium hydroxide aqueous solution with a pH of 10 at a solid-liquid ratio of 1:12.5 and soak for 2 hours. Then filter to obtain the solid. Wash the solid repeatedly with water until the filtrate is acid-base neutral. After filtration, let it stand for aging for 18 hours. Then dry it in a 60°C oven until the moisture content is less than 10% to obtain modified tourmaline powder.

[0036] (4) Seven parts of conventional polyester chips, one part of modified tourmaline powder, 0.75 parts of 20nm particle size seagull stone powder, and 0.45 parts of ethyl acetate were added to a high-speed mixer and stirred at 500 rpm for 30 min, with the stirring temperature controlled at 220℃ to ensure uniform mixing of the various raw materials. Then, the mixture was fed into a reactive twin-screw extruder at a screw extrusion temperature of 260℃. After melt mixing, the mixture was extruded, stretched, and pelletized to obtain polyester masterbatch. Conventional polyester chips and polyester masterbatch were blended at a mass ratio of 1:1. Melt spinning was performed at a spinning temperature of 290℃ and a spinning speed of 2600 m / min using a "C" type microporous spinneret to obtain modified polyester hollow fiber. Modified polypropylene fiber and modified polyester hollow fiber were mixed at a mass ratio of 1:1.25 and woven to produce a weight of 175 g / m².2 Composite fabric.

[0037] Example 3

[0038] (1) Add dried graphene oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL, then add fumed silica. The molar ratio of graphene oxide to fumed silica is 5:1. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min to prepare a mixed dispersion. Then flash freeze the mixed dispersion in liquid nitrogen at a temperature of -40℃. Then dry the frozen mixed dispersion in a vacuum for 24 h at a vacuum degree of -0.085 MPa to prepare a mixed aerogel.

[0039] (2) 9.6 parts polypropylene, 1.5 parts propylene trichlorosilane, 1.5 parts maleic anhydride, 0.002 parts benzoyl peroxide catalyst and 1.8 parts mixed aerogel were put into a high-speed stirrer. The mixture was first stirred at a low speed of 120 rpm for 15 min, and then stirred at a high speed of 800 rpm for 25 min. The stirring temperature was controlled at 100℃ to ensure that the raw materials were mixed evenly. Then the mixture was put into a reactive twin-screw extruder with a screw extrusion temperature of 230℃. After melting and mixing, the mixture was extruded, drawn into strips and granulated to obtain blended particles. The blended particles were then put into a spinning screw extruder with a screw extrusion temperature of 1250℃. The molten material was extruded into melt fibers through a spinneret with 24 holes. The fibers were then cooled by a cooling air blower at a temperature of 30℃ and stretched by a hot roller at a temperature of 90℃ with a stretching ratio of 3.0. Finally, the fibers were wound into shape on a winding machine with a winding speed of 3000 m / min to obtain modified polypropylene fibers.

[0040] (3) Place the tourmaline powder in a fluoropolymer furnace and heat it to 700°C at a rate of 10°C / min. Then continue to calcine for more than 4 hours. Quickly place the calcined tourmaline powder in a magnesium hydroxide aqueous solution with a pH of 11 and a solid-liquid ratio of 1:20. Soak for 3 hours, then filter to obtain the solid. Wash the solid repeatedly with water until the filtrate is acid-base neutral. After filtration, let it stand for aging for 24 hours. Then dry it in a 60°C oven until the moisture content is less than 10% to obtain modified tourmaline powder.

[0041] (4) Add 9 parts of conventional polyester chips, 1.5 parts of modified tourmaline powder, 1 part of 20nm particle size seagull stone powder, and 0.7 parts of ethyl acetate to a high-speed mixer and stir at 500 rpm for 30 min, keeping the stirring temperature at 220℃ to ensure uniform mixing of all raw materials. Then, feed the mixture into a reactive twin-screw extruder at a screw extrusion temperature of 270℃. After melt mixing, extrude, draw, and pelletize to obtain polyester masterbatch. Blend conventional polyester chips and polyester masterbatch at a mass ratio of 1:1 and melt spin at a spinning temperature of 290℃ and a spinning speed of 2600 m / min using a "C" type microporous spinneret to obtain modified polyester hollow fiber. Mix modified polypropylene fiber and modified polyester hollow fiber at a mass ratio of 1:2 to produce a product with a basis weight of 200 g / m². 2 Composite fabric.

[0042] Comparative Example 1

[0043] The difference between Comparative Example 1 and Example 2 lies in the difference between steps (1) and (2). Steps (1) and (2) are changed to: (1) Add dried graphite oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min. Then flash freeze the dispersion in liquid nitrogen at a freezing temperature of -40°C. Then dry the frozen dispersion in a vacuum for 24 h at a vacuum degree of -0.085 MPa to make an aerogel.

[0044] (2) 8.8 parts of polypropylene, 1 part of propylene trichlorosilane, 1 part of maleic anhydride, 0.0015 parts of benzoyl peroxide catalyst, and 1.1 parts of aerogel were added to a high-speed stirrer. The mixture was first stirred at a low speed of 90 rpm for 10 min, and then stirred at a high speed of 600 rpm for 20 min. The stirring temperature was controlled at 100℃ to ensure that the various raw materials were mixed evenly. The mixture was then fed into a reactive twin-screw extruder with a screw extrusion temperature of 215℃. After melting and mixing, the mixture was extruded, drawn into strands, and granulated to obtain blended particles. The blended particles were then fed into a spinning screw extruder with a screw extrusion temperature of 220℃. The molten material was extruded into melt fibers through a spinneret with 24 holes. The fibers were then cooled by a cooling air blower at 30℃, stretched by a hot roller at 70℃ with a stretch ratio of 2.25, and finally wound into shape on a winding machine at a winding speed of 2250 m / min to obtain modified polypropylene fibers. The remaining steps were the same as in Example 2.

[0045] Comparative Example 2

[0046] The difference between Comparative Example 2 and Example 2 lies in step (2). Step (2) is changed to: adding 8.8 parts of polypropylene, 1 part of maleic anhydride, 0.0015 parts of benzoyl peroxide catalyst, and 1.1 parts of mixed aerogel into a high-speed stirrer, first stirring at low speed of 90 rpm for 10 min, then stirring at high speed of 600 rpm for 20 min, controlling the stirring temperature at 100℃ to ensure uniform mixing of all raw materials, and then feeding it into a reactive twin-screw extruder. The screw extrusion temperature is 215℃. After blending, the mixture is extruded, drawn into strands, and pelletized to obtain blended granules. The blended granules are then fed into a spinning screw extruder, with the screw extrusion temperature set to 220°C. The molten material is extruded into melt fibers through a spinneret with 24 orifices. The fibers are then cooled by a cooling air blower at 30°C, stretched by a hot roller at 70°C with a stretch ratio of 2.25, and finally wound into shape on a winding machine at a winding speed of 2250 m / min to obtain modified polypropylene fibers. The remaining steps are the same as in Example 2.

[0047] Comparative Example 3

[0048] The difference between Comparative Example 3 and Example 2 lies in step (2). Step (2) is changed as follows: 8.8 parts of polypropylene, 1 part of propylene-based trichlorosilane, 0.0015 parts of benzoyl peroxide catalyst, and 1.1 parts of mixed aerogel are added to a high-speed stirrer. The mixture is first stirred at a low speed of 90 rpm for 10 minutes, and then stirred at a high speed of 600 rpm for 20 minutes, while maintaining the stirring temperature at 100°C to ensure uniform mixing of the various raw materials. The mixture is then fed into a reactive twin-screw extruder, with the screw extrusion temperature set at 215°C. After melting and mixing, the mixture is extruded, drawn into strands, and pelletized to obtain blended particles. The blended particles are then fed into a spinning screw extruder, with the screw extrusion temperature set at 220°C. The molten material is extruded into melt fibers through a spinneret with 24 orifices. The fibers are then cooled by a cooling air blower at 30°C, stretched by a hot roller at 70°C with a stretch ratio of 2.25, and finally wound into shape on a winding machine at a winding speed of 2250 m / min to obtain modified polypropylene fibers. The remaining steps are the same as in Example 2.

[0049] Comparative Example 4

[0050] The difference between Comparative Example 4 and Example 2 is that step (1) is omitted, and step (2) is changed to: 8.8 parts of polypropylene, 1 part of propylene-based trichlorosilane, 1 part of maleic anhydride, 0.0015 parts of benzoyl peroxide catalyst, 0.55 parts of fumed silica, and 0.55 parts of graphene oxide are added to a high-speed stirrer, stirred at a low speed of 90 rpm for 10 minutes, and then stirred at a high speed of 600 rpm for 20 minutes, with the stirring temperature controlled at 100°C to ensure uniform mixing of the various raw materials. Then, the mixture is fed into a reactive twin-screw extruder, and the screws are extruded... The temperature is 215℃. After melting and mixing, the mixture is extruded, drawn into strands, and granulated to obtain blended particles. The blended particles are then fed into a spinning screw extruder with the screw extrusion temperature set at 220℃. The molten material is extruded into melt fibers through a spinneret with 24 orifices. The fibers are then cooled by a cooling air blower at 30℃, stretched by a hot roller at 70℃ with a stretch ratio of 2.25, and finally wound into shape on a winding machine at a winding speed of 2250m / min to obtain modified polypropylene fibers. The remaining steps are the same as in Example 2.

[0051] Comparative Example 5

[0052] The difference between Comparative Example 5 and Example 2 is that step (3) is omitted, and step (4) is changed to: 7 parts of conventional polyester chips, 1 part of tourmaline powder, 0.75 parts of 20nm particle size seagull stone powder, and 0.45 parts of ethyl acetate are added to a high-speed stirrer and stirred at 500 rpm for 30 min, with the stirring temperature controlled at 220℃ to ensure uniform mixing of the various raw materials. Then, the mixture is fed into a reactive twin-screw extruder with a screw extrusion temperature of 260℃. After melt mixing, the mixture is extruded, drawn into strands, and granulated to obtain polyester masterbatch. Conventional polyester chips and polyester masterbatch are blended at a mass ratio of 1:1. Melt spinning is performed at a spinning temperature of 290℃ and a spinning speed of 2600 m / min using a "C" type microporous spinneret to obtain modified polyester hollow fiber. Modified polypropylene fiber and modified polyester hollow fiber are mixed at a mass ratio of 1:1.25 to produce a weight of 175 g / m². 2 The composite fabric; the remaining steps are the same as in Example 2.

[0053] Example of effect

[0054] Table 1 below shows the performance analysis results of a thermal and health-care composite fabric using Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0055] Table 1

[0056] Clo value Far-infrared normal emissivity (%) Example 1 1.32 87.5 Example 2 1.34 87.6 Example 3 1.34 87.5 Comparative Example 1 1.23 84.5 Comparative Example 2 1.29 86.7 Comparative Example 3 1.28 86.4 Comparative Example 4 0.72 85.6 Comparative Example 5 1.30 72.1

[0057] A comparison of the experimental data on Clo values ​​from the examples and comparative examples reveals that the present invention combines fumed silica with graphene oxide aerogel, and the silica oxygen groups on the surface of fumed silica combine with the hydroxyl groups of graphene oxide hydrogel to prepare a mixed aerogel, which greatly improves the warmth retention of the fabric. The mixed aerogel is combined with propylene trichlorosilane and grafted onto the macromolecular chain of polypropylene via maleic anhydride, which not only improves the compatibility between the aerogel and polypropylene, but also solves the problem of aerogel aggregation. A comparison of the experimental data on far-infrared normal emissivity of the embodiments and comparative examples reveals that the present invention, by first calcining tourmaline and then directly subjecting it to quenching and hydration modification, not only increases the number of groups in the crystal capable of generating high-frequency infrared vibrations, but also enhances the radiation of high-frequency short-wave infrared rays due to lattice distortion after rapid cooling. Furthermore, the Si-OH groups on the surface of the tourmaline combine with the active groups in the polyester molecular chain, spinning them into hollow fibers. The graphene oxide and silicon dioxide in the aerogel can absorb the far-infrared rays emitted by the modified tourmaline, improving utilization. The aerogel that absorbs far-infrared rays can also generate resonance and warming effects, penetrating deep into the skin, promoting blood circulation, enhancing immune function, and achieving health benefits. The modified tourmaline has the ability to generate negative ions, and the addition of seagull stone powder further enhances its antibacterial effect by disrupting the structure of bacteria. The human body, through the absorption of far-infrared rays, negative ions, and mineral elements released by the tourmaline and negative ion powder, promotes the metabolism of harmful substances in the skin, improves skin elasticity, and promotes blood circulation and metabolism throughout the body, thereby achieving health benefits.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing a thermal insulation and health-care composite fabric, characterized in that, The preparation steps include the following: (1) Add dried graphene oxide to deionized water to form a dispersion with a concentration of 2.5 mg / mL, then add fumed silica. The molar ratio of graphene oxide to fumed silica is 1-5:

1. Stir at 120 rpm for 20 min, then sonicate at 60 kHz for 20 min to form a mixed dispersion. Then flash freeze the mixed dispersion in liquid nitrogen, and then dry the frozen mixed dispersion in vacuum for 24 h at a vacuum degree of -0.085 MPa to form a mixed aerogel. (2) Add 8-9.6 parts of polypropylene, 0.5-1.5 parts of propylene-based trichlorosilane, 0.5-1.5 parts of maleic anhydride, 0.001-0.002 parts of catalyst, and 0.4-1.8 parts of mixed aerogel to a high-speed stirrer. First, stir at a low speed of 60-120 rpm for 5-15 minutes, then stir at a high speed of 400-800 rpm for 15-25 minutes, keeping the stirring temperature at 100℃ to ensure uniform mixing of all raw materials. Then, feed the mixture into a reactive twin-screw extruder and extrude the mixture. At a temperature of 200-230℃, after melting and mixing, the mixture is extruded, drawn into strands, and granulated to obtain blended granules. The blended granules are then fed into a spinning screw extruder, where the molten material is extruded into melt fibers through a spinneret with 24 orifices. The fibers are then cooled by a cooling air blower at a temperature of 30℃, stretched by hot rollers at a temperature of 50-90℃ with a stretch ratio of 1.5-3.0, and finally wound into shape on a winding machine at a winding speed of 1500-3000 m / min to obtain modified polypropylene fibers. (3) Place the tourmaline powder in a fluoropolymer furnace, heat it to 500-700℃, and continue to calcine for more than 4 hours; quickly place the calcined tourmaline powder in a magnesium hydroxide aqueous solution with a pH of 10-11, with a solid-liquid ratio of 1:5-20, soak for 1-3 hours, then filter to obtain the solid, wash repeatedly with water until the filtrate is acid-base neutral, filter and let stand for aging for 12-24 hours, and then place it in a 60℃ oven to dry until the moisture content is less than 10% to obtain modified tourmaline powder; (4) Add 6-9 parts of conventional polyester chips, 0.5-1.5 parts of modified tourmaline powder, 0.5-1 parts of 20nm particle size seagull stone powder, and 0.2-0.7 parts of ethyl acetate to a high-speed stirrer and stir at 500rpm for 30min, keeping the stirring temperature at 220℃ to ensure uniform mixing of all raw materials. Then, put the mixture into a reactive twin-screw extruder with a screw extrusion temperature of 250-270℃. After melt mixing, extrude, stretch, and pelletize to obtain polyester masterbatch. Blend conventional polyester chips and polyester masterbatch together and melt spin at a spinning temperature of 290℃ and a spinning speed of 2600m / min. Use a "C" type microporous spinneret to produce modified polyester hollow fiber. Mix modified polypropylene fiber and modified polyester hollow fiber at a mass ratio of 1:0.5-2 to weave a composite fabric.

2. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, In step (1), the quick-freezing temperature is -40℃.

3. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, The catalyst in step (2) is benzoyl peroxide.

4. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, The screw extrusion temperature in step (2) is 190-250℃.

5. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, The heating rate in step (3) is 5-10℃ / min.

6. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, In step (4), the mass ratio of conventional polyester chips to polyester masterbatch is 1:

1.

7. The method for preparing a thermal insulation and health-care composite fabric according to claim 1, characterized in that, In step (4), the fabric weight is 150-200 g / m². 2 .