Light-absorbing heat-generating polar bear-like polyester fiber and preparation method thereof

Abstract

The present application relates to a kind of light-absorbing heat-emitting polar bear-like polyester fibers and its preparation method, belong to polyester fiber technical field.The present application is with ferroferric oxide nanocrystal as core, through cation exchange deposition copper sulfide shell, then through vinyltriethoxysilane modification and introduce double bond to form self-made modified light-absorbing heat-emitting nanoparticles, with unsaturated polyester fiber, octadecyl methacrylate is mixed, in the magnetic field auxiliary is fused spinning through the concentric shaft centrifugal disc spray hole and is made into hollow fiber, after freeze drying, obtain porous fiber.Ferroferric oxide and copper sulfide form synergistic photothermal effect, widen light-absorbing wave band;Hydrophobic long-chain alkyl modification gives fiber superhydrophobic property, can underwater capture air and improve warmth retention;Under the assistance of magnetic field, nanoparticles and crosslinking network cooperate, enhance the mechanical properties of fiber.The effect of the present application prepared has light-absorbing heat-emitting, good warmth retention and excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of polyester fiber synthesis technology, specifically to a light-absorbing and heat-generating polar bear-inspired polyester fiber and its preparation method. Background Technology

[0002] As a core material for outdoor insulation, special protection, and extreme environment operation equipment, light-absorbing and heat-generating polyester fiber has become a research hotspot in the industry due to its comprehensive performance improvement. However, existing technologies still have many key defects that need to be solved, which seriously restrict its practical application scope and use effect.

[0003] In existing technologies, light-absorbing and heat-generating polyester fibers mostly employ single-component nanomaterials, which have narrow light absorption bands, limited photothermal conversion efficiency, and difficulty in simultaneously achieving underwater thermal insulation and mechanical properties. Traditional fibers lack sufficient hydrophobicity, resulting in a significant decrease in thermal insulation performance upon contact with water; simultaneously, nanoparticles tend to aggregate in the matrix, affecting fiber formation and strength. Furthermore, how to achieve broad-spectrum absorption, continuous heat generation, and effective thermal insulation in harsh environments through structural biomimicry and multi-mechanism synergy remains a pressing challenge in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a light-absorbing and heat-generating polar bear-inspired polyester fiber 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 light-absorbing and heat-generating polyester fiber that mimics a polar bear, comprising the following steps: (1) Mix iron oxide nanocrystals, sodium sulfide and deionized water at a mass ratio of 1~2:0.2~0.5:50 and stir at room temperature for 15 min to obtain solution A; then mix copper chloride (0.3~0.5 times the mass of iron oxide nanocrystals) with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with buffer A, and stir at room temperature for 15 min to obtain solution B; under a nitrogen atmosphere, slowly add solution B to solution A, heat to 40~50℃ and stir for 2~4 h, centrifuge for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and vacuum dry at 60℃ for 6 h to obtain self-made nanoparticles; (2) Mix the self-made nanoparticles, vinyltriethoxysilane, buffer B and deionized water in a mass ratio of 1~2:0.2~0.3:0.1:20, heat to 60~70℃ and stir under reflux for 5~7h, centrifuge for 15min, collect the precipitate, wash it 3 times with deionized water and 1 time with anhydrous ethanol, and vacuum dry at 60℃ for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles. (3) Unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, initiator and dispersant are mixed in a mass ratio of 60~70:10~15:20~30:1:5 and stirred at 60℃ and 800rpm for 30min to obtain spinning solution. Under magnetic field assistance, the solution is melted and sprayed out through the nozzle of a concentric centrifugal disc for spinning. The temperature is lowered to -30℃ at 5℃ / min and the vacuum is drawn to -0.09MPa for 30h. After drying, nitrogen is introduced and the temperature and pressure are restored to normal. The solution is then cut to obtain light-absorbing and heat-generating polar bear-like polyester fiber.

[0006] Furthermore, the iron oxide nanocrystals mentioned in step (1) have a particle size of 20 nm.

[0007] Furthermore, the buffer solution A in step (1) is a 0.1M aqueous solution of hydrochloric acid.

[0008] Furthermore, the slow dripping rate in step (1) is 2 mL / min.

[0009] Furthermore, the buffer solution B in step (2) is a 0.1M aqueous solution of nitric acid.

[0010] Furthermore, the unsaturated polyester resin in step (3) is: phthalic unsaturated polyester resin.

[0011] Furthermore, the initiator in step (3) is tert-butyl peroxide.

[0012] Furthermore, the dispersant in step (3) is polyethylene glycol.

[0013] Furthermore, the magnetic field strength in step (3) is 0.5T.

[0014] Furthermore, the diameter of the light-absorbing and heat-generating polar bear-like polyester fiber in step (3) is 1~5μm.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention mixes self-made modified light-absorbing and heat-generating nanoparticles with unsaturated resin and other components to achieve the effects of light-absorbing and heat-generating, good heat retention and excellent mechanical properties.

[0016] This invention uses iron oxide nanocrystals as the core, deposits a copper sulfide shell on the surface via cation exchange, and then modifies the surface with vinyltriethoxysilane to introduce double bonds, resulting in self-made modified light-absorbing and heat-generating nanoparticles. These are then mixed with unsaturated polyester fibers, octadecyl methacrylate, and other components, and spun under magnetic field assistance. The spun fibers are then melt-blown through the nozzles of a centrifugal disc with a concentric spindle to obtain hollow fibers. Freeze-drying further develops a porous structure within the fibers, resulting in light-absorbing and heat-generating polar bear-inspired polyester fibers. Iron oxide exhibits near-infrared I radiation. In the near-infrared II region, copper sulfide exhibits strong absorption and magnetothermal-assisted heating. This synergistic photothermal effect with iron oxide avoids the narrow wavelength limitation of single-core absorption, thus endowing the material with excellent light absorption and heating properties. After the surface of the unsaturated polyester fiber is modified with hydrophobic long-chain alkyl groups, its hydrophobicity is greatly enhanced, similar to the superhydrophobic polar bear fur, which can trap a layer of still air underwater, thereby improving its heat retention performance. Under the assistance of a magnetic field, the uniformly distributed nanoparticles and cross-linked networks work together to endow the fiber with excellent mechanical properties. Detailed Implementation

[0017] 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.

[0018] 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 the light-absorbing and heat-generating polar bear-inspired polyester fiber prepared in the following embodiments are as follows: Thermal insulation performance test: The thermal insulation performance of the light-absorbing and heat-generating polyester fibers prepared in Examples 1-5 and Comparative Examples 1-4 were tested according to standard GB / T35762-2017.

[0019] Light absorption and heat generation test: The test was conducted in an environment with a temperature of 25℃ and a humidity of 50%, using 150W infrared light as the light source. After irradiation for 1 minute, the fibers prepared in Examples 1-5 and Comparative Examples 1-4 were naturally cooled in this environment, and the temperature rise of each upper surface of the sample was measured using a thermocouple temperature tester.

[0020] Mechanical property testing: The fibers prepared in Examples 1-5 and Comparative Examples 1-4 were tested according to the standard ASTM C1557-20 using a universal tensile testing machine at a tensile speed of 50 mm / min. Each sample was tested 5 times and the average value was taken. Example 1

[0021] (1) Mix 20 nm Fe3O4 nanocrystals, sodium sulfide and deionized water at a mass ratio of 1:0.2:50 and stir at 300 rpm for 15 min at room temperature to obtain solution A; then mix 0.3 times the mass of Fe3O4 nanocrystals of copper chloride with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with 0.1 M hydrochloric acid aqueous solution, and stir at room temperature for 15 min to obtain solution B; under nitrogen atmosphere, add solution B dropwise to solution A at a rate of 2 mL / min, heat to 40 °C and stir at 200 rpm for 2 h, centrifuge at 8000 rpm for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and dry at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain self-made nanoparticles; (2) The self-made nanoparticles, vinyltriethoxysilane, 0.1M nitric acid aqueous solution and deionized water were mixed in a mass ratio of 1:0.2:0.1:20, heated to 60℃, stirred and refluxed at 300rpm for 5h, centrifuged at 8000rpm for 15min, the precipitate was collected, washed 3 times with deionized water and 1 time with anhydrous ethanol, and dried at 60℃ and vacuum degree -0.1MPa for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles; (3) Phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol were mixed in a mass ratio of 60:10:20:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution was melted and sprayed out through the nozzle of a concentric centrifugal disc under magnetic field assistance. The spinning parameters were: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, magnetic field strength of 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa for 30 h, nitrogen gas was introduced after drying, and the temperature and pressure were restored to normal. The solution was then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 1 μm. Example 2

[0022] (1) Mix 20 nm Fe3O4 nanocrystals, sodium sulfide and deionized water at a mass ratio of 1.2:0.25:50 and stir at 300 rpm for 15 min at room temperature to obtain solution A; then mix 0.35 times the mass of Fe3O4 nanocrystals of copper chloride with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with 0.1 M hydrochloric acid aqueous solution, and stir at room temperature for 15 min to obtain solution B; under a nitrogen atmosphere, add solution B dropwise to solution A at a rate of 2 mL / min, heat to 42 °C and stir at 200 rpm for 2.5 h, centrifuge at 8000 rpm for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and dry at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain self-made nanoparticles; (2) The self-made nanoparticles, vinyltriethoxysilane, 0.1M nitric acid aqueous solution and deionized water were mixed in a mass ratio of 1.2:0.22:0.1:20, heated to 62℃, stirred and refluxed at 300rpm for 5.5h, centrifuged at 8000rpm for 15min, the precipitate was collected, washed 3 times with deionized water and 1 time with anhydrous ethanol, and dried at 60℃ and vacuum degree -0.1MPa for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles; (3) Phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol were mixed in a mass ratio of 62:11:22:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution was melted and sprayed out through the nozzle of a concentric centrifugal disc under magnetic field assistance. The spinning parameters were: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, magnetic field strength of 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa and continuing for 30 h. After drying, nitrogen was introduced and the temperature and pressure were restored to normal. The solution was then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 2 μm. Example 3

[0023] (1) Mix 20 nm Fe3O4 nanocrystals, sodium sulfide and deionized water at a mass ratio of 1.5:0.3:50 and stir at 300 rpm for 15 min at room temperature to obtain solution A; then mix 0.4 times the mass of Fe3O4 nanocrystals of copper chloride with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with 0.1 M hydrochloric acid aqueous solution, and stir at room temperature for 15 min to obtain solution B; under a nitrogen atmosphere, add solution B dropwise to solution A at a rate of 2 mL / min, heat to 45 °C and stir at 200 rpm for 3 h, centrifuge at 8000 rpm for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and dry at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain self-made nanoparticles; (2) The self-made nanoparticles, vinyltriethoxysilane, 0.1M nitric acid aqueous solution and deionized water were mixed in a mass ratio of 1.5:0.25:0.1:20, heated to 65℃, stirred and refluxed at 300rpm for 6h, centrifuged at 8000rpm for 15min, the precipitate was collected, washed 3 times with deionized water and 1 time with anhydrous ethanol, and dried at 60℃ and vacuum degree -0.1MPa for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles; (3) Phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol were mixed in a mass ratio of 65:13:25:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution was melted and sprayed out through the nozzle of a concentric centrifugal disc under magnetic field assistance. The spinning parameters were: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, magnetic field strength of 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa for 30 h, nitrogen gas was introduced after drying, and the temperature and pressure were restored to normal. The solution was then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 3 μm. Example 4

[0024] (1) Mix 20 nm Fe3O4 nanocrystals, sodium sulfide and deionized water at a mass ratio of 1.8:0.4:50 and stir at 300 rpm for 15 min at room temperature to obtain solution A; then mix 0.45 times the mass of Fe3O4 nanocrystals of copper chloride with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with 0.1 M hydrochloric acid aqueous solution, and stir at room temperature for 15 min to obtain solution B; under a nitrogen atmosphere, add solution B dropwise to solution A at a rate of 2 mL / min, heat to 48 °C and stir at 200 rpm for 3.5 h, centrifuge at 8000 rpm for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and dry at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain self-made nanoparticles; (2) The self-made nanoparticles, vinyltriethoxysilane, 0.1M nitric acid aqueous solution and deionized water were mixed in a mass ratio of 1.8:0.28:0.1:20, heated to 68℃, stirred and refluxed at 300rpm for 6.5h, centrifuged at 8000rpm for 15min, the precipitate was collected, washed 3 times with deionized water and 1 time with anhydrous ethanol, and dried at 60℃ and vacuum degree -0.1MPa for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles; (3) Phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol were mixed in a mass ratio of 68:14:28:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution was melted and sprayed out through the nozzle of a concentric centrifugal disc under magnetic field assistance. The spinning parameters were: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, magnetic field strength of 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa for 30 h, nitrogen gas was introduced after drying, and the temperature and pressure were restored to normal. The solution was then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 4 μm. Example 5

[0025] (1) Mix 20 nm Fe3O4 nanocrystals, sodium sulfide and deionized water at a mass ratio of 2:0.5:50 and stir at 300 rpm for 15 min at room temperature to obtain solution A; then mix 0.5 times the mass of Fe3O4 nanocrystals of copper chloride with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with 0.1 M hydrochloric acid aqueous solution, and stir at room temperature for 15 min to obtain solution B; under nitrogen atmosphere, add solution B dropwise to solution A at a rate of 2 mL / min, heat to 50 °C and stir at 200 rpm for 4 h, centrifuge at 8000 rpm for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and dry at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain self-made nanoparticles; (2) The self-made nanoparticles, vinyltriethoxysilane, 0.1M nitric acid aqueous solution and deionized water were mixed in a mass ratio of 2:0.3:0.1:20, heated to 70℃, stirred and refluxed at 300rpm for 7h, centrifuged at 8000rpm for 15min, the precipitate was collected, washed 3 times with deionized water and 1 time with anhydrous ethanol, and dried at 60℃ and vacuum degree -0.1MPa for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles; (3) Phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol were mixed in a mass ratio of 70:15:30:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution was melted and sprayed out through the nozzle of a concentric centrifugal disc under magnetic field assistance. The spinning parameters were: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, magnetic field strength of 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa and continuing for 30 h. After drying, nitrogen was introduced and the temperature and pressure were restored to normal. The solution was then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 5 μm.

[0026] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that step (1) is omitted, and step (2) is changed to: mixing 20 nm iron oxide nanocrystals, vinyltriethoxysilane, 0.1 M nitric acid aqueous solution and deionized water in a mass ratio of 1.5:0.25:0.1:20, heating to 65 °C, stirring and refluxing at 300 rpm for 6 h, centrifuging at 8000 rpm for 15 min, collecting the precipitate, washing it 3 times with deionized water and once with anhydrous ethanol, and drying it at 60 °C and vacuum degree -0.1 MPa for 6 h to obtain the self-made modified light-absorbing and heat-generating nanoparticles. The remaining steps are the same as in Example 3.

[0027] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that step (2) is omitted, and step (3) is changed to: phthalic unsaturated polyester resin, self-made nanoparticles, octadecyl methacrylate, tert-butyl peroxide and polyethylene glycol are mixed in a mass ratio of 65:13:25:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain spinning solution. Under magnetic field assistance, the solution is melted and sprayed out through the nozzle of a concentric centrifugal disc for spinning. The spinning parameters are: spinning screw temperature is 170°C, centrifugal disc speed is 2000 rpm, magnetic field strength is 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa, and continuing for 30 h. After drying, nitrogen is introduced and the temperature and pressure are restored to normal. The solution is then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 3 μm. The remaining steps are the same as in Example 3.

[0028] Comparative Example 3 The difference between Comparative Example 3 and Example 3 lies in step (3). Step (3) is changed to: phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, tert-butyl peroxide and polyethylene glycol are mixed in a mass ratio of 65:13:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain spinning solution. Under magnetic field assistance, the solution is melted and sprayed out through the nozzle of a concentric centrifugal disc for spinning. The spinning parameters are: spinning screw temperature is 170°C, centrifugal disc speed is 2000 rpm, magnetic field strength is 0.5T, cooling to -30°C at 5°C / min, vacuuming to -0.09MPa, and continuing for 30 h. After drying, nitrogen is introduced and the temperature and pressure are restored to normal. The solution is then cut to obtain light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 3 μm. The remaining steps are the same as in Example 3.

[0029] Comparative Example 4 The difference between Comparative Example 4 and Example 3 lies in step (3). Step (3) is changed to: phthalic unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, tert-butyl peroxide, and polyethylene glycol are mixed in a mass ratio of 65:13:25:1:5 and stirred at 60°C and 800 rpm for 30 min to obtain a spinning solution. The solution is melt-sprayed through the nozzle of a concentric centrifugal disc and spun. The spinning parameters are: spinning screw temperature of 170°C, centrifugal disc speed of 2000 rpm, cooling to -30°C at 5°C / min, vacuuming to -0.09 MPa for 30 h, and after drying, nitrogen gas is introduced to restore to room temperature and pressure. The solution is then cut to obtain a light-absorbing and heat-generating polar bear-like polyester fiber with a diameter of 3 μm. The remaining steps are the same as in Example 3.

[0030] Example of effect Table 1 below presents the performance analysis results of the light-absorbing and heat-generating polar bear-inspired polyester fibers of Examples 1 to 5 and Comparative Examples 1 to 4 of the present invention.

[0031] Table 1

[0032] A comparison of the experimental data on the heat retention rate of the examples and comparative examples reveals that the present invention uses iron oxide nanocrystals as the core, deposits a copper sulfide shell through cation exchange deposition, and then introduces double bonds through vinyltriethoxysilane modification to form self-made modified light-absorbing and heat-generating nanoparticles. These nanoparticles are mixed with unsaturated polyester fibers and octadecyl methacrylate, and melt-spun into hollow fibers through a concentric centrifugal disc under magnetic field assistance. After freeze-drying, porous fibers are obtained. The surface of the unsaturated polyester fibers is modified with hydrophobic long-chain alkyl groups, which greatly enhances the surface hydrophobicity, similar to the superhydrophobic polar bear fur. The invention can capture a layer of still air underwater, thereby improving underwater heat retention performance. A comparison of the temperature rise data after 1 minute of irradiation in the examples and comparative examples reveals that in this invention, iron oxide absorbs in the near-infrared I region, with magnetocaloric assisted heating, while copper sulfide strongly absorbs in the near-infrared II region, forming a synergistic photothermal effect with iron oxide. This avoids the narrow light absorption band defect of a single nucleus, endowing the material with excellent light absorption and heat generation properties. A comparison of the tensile strength data in the examples and comparative examples reveals that, under the assistance of a magnetic field, the uniformly distributed nanoparticles and cross-linked network synergistically endow the fiber with excellent mechanical properties.

[0033] 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 light-absorbing and heat-generating polyester fiber that mimics a polar bear, characterized in that, Includes the following steps: (1) Mix iron oxide nanocrystals, sodium sulfide and deionized water at a mass ratio of 1~2:0.2~0.5:50 and stir at room temperature for 15 min to obtain solution A; then mix copper chloride (0.3~0.5 times the mass of iron oxide nanocrystals) with deionized water at a mass ratio of 1:20, adjust the pH to 5.5 with buffer A, and stir at room temperature for 15 min to obtain solution B; under a nitrogen atmosphere, slowly add solution B to solution A, heat to 40~50℃ and stir for 2~4 h, centrifuge for 15 min, collect the precipitate, wash 3 times with deionized water and 1 time with anhydrous ethanol, and vacuum dry at 60℃ for 6 h to obtain self-made nanoparticles; (2) Mix the self-made nanoparticles, vinyltriethoxysilane, buffer B and deionized water in a mass ratio of 1~2:0.2~0.3:0.1:20, heat to 60~70℃ and stir under reflux for 5~7h, centrifuge for 15min, collect the precipitate, wash it 3 times with deionized water and 1 time with anhydrous ethanol, and vacuum dry at 60℃ for 6h to obtain the self-made modified light-absorbing and heat-generating nanoparticles. (3) Unsaturated polyester resin, self-made modified light-absorbing and heat-generating nanoparticles, octadecyl methacrylate, initiator and dispersant are mixed in a mass ratio of 60~70:10~15:20~30:1:5 and stirred at 60℃ and 800rpm for 30min to obtain spinning solution. Under magnetic field assistance, the solution is melted and sprayed out through the nozzle of a concentric centrifugal disc for spinning. The temperature is lowered to -30℃ at 5℃ / min and the vacuum is drawn to -0.09MPa for 30h. After drying, nitrogen is introduced and the temperature and pressure are restored to normal. The solution is then cut to obtain light-absorbing and heat-generating polar bear-like polyester fiber.

2. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The iron oxide nanocrystals mentioned in step (1) have a particle size of 20 nm.

3. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The buffer solution A in step (1) is a 0.1M aqueous solution of hydrochloric acid.

4. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The slow dripping rate in step (1) is 2 mL / min.

5. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The buffer solution B in step (2) is a 0.1M aqueous solution of nitric acid.

6. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The unsaturated polyester resin mentioned in step (3) is: phthalic unsaturated polyester resin.

7. The light-absorbing and heat-generating polar bear-inspired polyester fiber according to claim 1, characterized in that, The initiator in step (3) is tert-butyl peroxide.

8. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The dispersant in step (3) is polyethylene glycol.

9. The light-absorbing and heat-generating polyester fiber mimicking a polar bear according to claim 1, characterized in that, The magnetic field strength in step (3) is 0.5T.

10. The light-absorbing and heat-generating polar bear-inspired polyester fiber according to claim 1, characterized in that, The diameter of the light-absorbing and heat-generating polar bear-like polyester fiber in step (3) is 1~5μm.

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