Spectrum self-adaptive radiation refrigeration fiber and preparation method and application thereof

Abstract

The invention relates to the technical field of fiber preparation, in particular to a spectrum self-adaptive radiation refrigeration fiber and a preparation method and application thereof.The spectrum self-adaptive radiation refrigeration fiber is prepared from, by weight, 20-50 parts of radiation refrigeration master batch and 50-80 parts of fiber forming polymer master batch. The radiation refrigeration master batch is prepared from the following raw materials in parts by weight: 5 to 20 parts of radiation refrigeration composite powder, 5 to 10 parts of near-infrared regulation particles and 75 to 80 parts of fiber-forming polymer, the radiation refrigeration composite powder is prepared from the following raw materials: an aluminate rare earth compound, inorganic powder and a fatty acid modifier. According to the near-infrared regulation and control particle, modified tungsten-doped vanadium dioxide serves as a core layer, and a PMMA polymer containing methacryloyloxypropyl polyhedral oligomeric silsesquioxane serves as a shell layer. By introducing the self-prepared radiation refrigeration master batch, the problems that the temperature of existing radiation refrigeration fibers cannot be adjusted and a melt spinning process cannot be met are effectively solved, and the actual application requirements are better met.

Description

Technical Field

[0001] This invention relates to the field of fiber preparation technology, specifically to a spectrally adaptive radiation cooling fiber, its preparation method, and its application. Background Technology

[0002] Radiation-cooling fiber is a new type of environmentally friendly material with high solar reflectivity. It can reflect solar heat and also emit its own heat into space through atmospheric window wavelengths, thus achieving a zero-energy radiation cooling effect. It can effectively address the problem of outdoor fabric temperatures rising significantly due to strong solar radiation and the heat island effect in summer, which affects wearing comfort.

[0003] Currently, functional components with radiative cooling capabilities are often added to fibers to prepare radiative cooling fiber products. Chinese patent application (publication number CN118910762A) discloses a radiative cooling fiber with heterogeneous structure and cross-section prepared by wet spinning, its preparation method, and the fabric. The prepared fiber exhibits good mid-infrared emissivity and wicking effect. Compared to wet spinning, melt spinning is simpler and allows for rapid production of large quantities of fibers. Chinese patent application (publication number CN110685031A) utilizes melt spinning to prepare a fiber with excellent radiative cooling effect. Further weaving yields a radiative cooling fabric with 60% reflectivity in the solar radiation band and greater than 80% emissivity in the human body thermal radiation band, suitable for preparing radiative cooling textiles. However, considering the temperature differences between morning, noon, and evening in summer, shortcomings are apparent. Once formed, the radiative cooling performance of current radiative cooling fibers is fixed and cannot actively adjust the radiative cooling performance of textiles according to ambient temperature conditions. Wearing fabrics woven from radiative cooling fibers can cause "cold stress" in the low morning temperatures of summer due to the continuous cooling effect. Chinese patent application (publication number CN118932697 A) describes a temperature-adaptive radiation cooling self-cleaning fabric prepared using a pad-drying process. The fabric surface is coated with polydimethylsiloxane and tungsten-doped vanadium dioxide to achieve intelligent temperature regulation. However, when W-VO2 is directly applied to the melt spinning of fiber-forming polymers, its chemical stability is poor. It is easily oxidized to vanadium pentoxide at high melting temperatures, leading to the deterioration and loss of phase transformation properties, and its compatibility with the fiber-forming polymers is also poor. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a spectrum-adaptive radiation cooling fiber. By introducing a self-prepared radiation cooling masterbatch, it effectively solves the problems of unadjustable cooling performance of existing radiation cooling fibers and easy oxidation and functional degradation of tungsten-doped vanadium dioxide when applied to melt spinning processes, thus better meeting practical application needs.

[0005] The present invention provides a spectrum-adaptive radiation cooling fiber, the raw materials for which, by weight, are: 20-50 parts of radiation cooling masterbatch and 50-80 parts of fiber-forming polymer masterbatch.

[0006] The raw materials for preparing the radiation cooling masterbatch, by weight, include 5-20 parts of radiation cooling composite powder, 5-10 parts of near-infrared modulation particles, and 75-80 parts of fiber-forming polymer. The raw materials for preparing the radiation-cooled composite powder include: rare earth aluminate compounds, inorganic powders, and fatty acid modifiers.

[0007] The near-infrared modulated particles use modified tungsten-doped vanadium dioxide as the core layer and PMMA polymer containing methacryloyloxypropyl cage-type polysilsesquioxane as the shell layer.

[0008] Existing radiation-cooling fibers suffer from problems such as unadjustable cooling performance and the inability to meet the requirements of melt spinning processes when functional fillers are directly introduced. This invention addresses these issues by introducing radiation-cooling composite powder (prepared from rare earth aluminate compounds, inorganic powders, and fatty acid modifiers) and near-infrared regulating particles (with a core-shell structure, using modified tungsten-doped vanadium dioxide as the core layer and a PMMA polymer containing methacryloyloxypropyl cage-type polysilsesquioxane as the shell) into polymer fibers. This imbues the fibers with excellent daytime radiation-cooling performance and near-infrared band modulation effects, enabling dynamic control of radiation-cooling performance. At low temperatures, the near-infrared transmittance in the solar spectrum is enhanced, increasing solar heat input and preventing "overcooling." At high temperatures, the higher near-infrared reflectivity reduces heat input, while maintaining good spinnability. The possible reasons are as follows: the combination of rare earth aluminate compounds, inorganic powders and fatty acid modifiers enables the provided radiation cooling composite powder to fully exert its radiation cooling function. The core-shell structure coating ensures the chemical stability of tungsten-doped vanadium dioxide during the production process, ensuring the subsequent near-infrared modulation function. This solves the problem that the existing radiation cooling fibers have unadjustable cooling performance and the direct introduction of functional fillers cannot meet the requirements of melt spinning process.

[0009] In one embodiment, the mass ratio of the rare earth aluminate compound, the inorganic powder, and the fatty acid modifier is 50:10-12.5:6-6.25.

[0010] In one embodiment, the raw materials for preparing the rare earth aluminate compound include aluminum salts, lanthanum salts, and rare earth compounds.

[0011] In one embodiment, the rare earth compound is a rare earth compound containing any one of the rare earth elements selected from yttrium, ytterbium, samarium, neodymium, gadolinium, europium, erbium, or cerium.

[0012] In one embodiment, the aluminum salt is aluminum nitrate nonahydrate, and the lanthanum salt is lanthanum nitrate hexahydrate.

[0013] In one embodiment, the particle size of the inorganic powder is 0.3~1.8μm.

[0014] In one embodiment, the inorganic powder is selected from at least one of rare earth phosphates, rare earth oxides, aluminum phosphate, aluminum oxide, zinc oxide, or magnesium oxide. In one embodiment, the rare earth phosphate is selected from at least one of lanthanum phosphate, yttrium phosphate, or gadolinium phosphate.

[0015] In one embodiment, the rare earth oxide is selected from at least one of lanthanum oxide, yttrium oxide, gadolinium oxide, lutetium oxide, scandium oxide, neodymium oxide, samarium oxide, ytterbium oxide, or argon oxide.

[0016] In one embodiment, the fatty acid modifier is selected from one or a mixture of several of saturated fatty acids, unsaturated fatty acids and their derivatives having 12-22 carbon atoms.

[0017] In one embodiment, the fatty acid modifier is selected from at least one of stearic acid, oleic acid, aluminum stearate, sodium oleate, sodium stearate, or potassium oleate.

[0018] In one embodiment, the method for preparing the rare earth aluminate compound includes the following steps: A mixed salt solution is obtained by dissolving aluminum salt, lanthanum salt and rare earth compound in water, adding citric acid aqueous solution dropwise, and reacting at a constant temperature of 80-90℃ to form a gel. The gel is then dried, ground, sieved and calcined to obtain rare earth aluminate compound.

[0019] In one embodiment, the mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 170-190:160-180:30-50.

[0020] In one embodiment, the mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 185-187.5:173.2-175:38.3-45.1.

[0021] In one embodiment, the concentration of the citric acid aqueous solution is 1.5-3 mol / L.

[0022] In one embodiment, the concentration of the citric acid aqueous solution is 2.41-2.5 mol / L.

[0023] In one embodiment, the total mass concentration of aluminum salt, lanthanum salt and rare earth compounds in the mixed salt solution is 360-420 g / L.

[0024] In one embodiment, the total mass concentration of aluminum salt, lanthanum salt and rare earth compounds in the mixed salt solution is 399-405.8 g / L.

[0025] In one embodiment, the ratio of the added aluminum salt to the citric acid aqueous solution is 170-190g:0.05-0.3L.

[0026] In one embodiment, the ratio of the added aluminum salt to the citric acid aqueous solution is 185-187.5g: 0.1-0.2L.

[0027] In one embodiment, the drying temperature is 80-90°C and the time is 5-6 hours.

[0028] In one embodiment, the fineness of the grinding and sieving is 200-400 mesh.

[0029] In one embodiment, the calcination temperature is 1200-1300℃ and the time is 2-3 hours.

[0030] In one embodiment, the method for preparing the radiation-cooled composite powder includes the following steps: Rare earth aluminate compounds are dispersed with alcohol compounds and then ground to obtain a slurry. Fatty acid modifiers are added and stirred to dissolve the slurry. Inorganic powders are added and ultrasonically dispersed. After heating and stirring, the slurry is post-treated to obtain radiation-cooled composite powder.

[0031] In one embodiment, the ratio of the rare earth aluminate compound to the alcohol compound is 50g:117-142mL.

[0032] In one embodiment, the grinding conditions include: using a ball mill, rotating at 200-300 r / min, for 4-8 h, and sieving to a fineness of 400-500 mesh.

[0033] In one embodiment, the ultrasonic dispersion time is 10-15 min.

[0034] In one embodiment, the heating and stirring temperature is 60-65°C, and the time is 20-24 hours.

[0035] In one embodiment, the post-processing includes the following steps: filtering the heated and stirred product, washing it, drying it at 50-60℃ for 5-10 hours, and grinding it to obtain a radiation-cooled composite powder with a fineness of 0.2~2.0μm.

[0036] In one embodiment, the raw materials for preparing the modified tungsten-doped vanadium dioxide include: tungsten-doped vanadium dioxide (W-VO2) and silane coupling agent KH-570.

[0037] In one embodiment, the amount of the silane coupling agent KH-570 is 8-14% of the mass of tungsten-doped vanadium dioxide.

[0038] This invention reduces the absorption rate of lanthanum aluminate-based radiative cooling materials in the near-infrared band by introducing rare earth elements, while exhibiting extremely high emissivity in the atmospheric window band. Combined with inorganic powders of a wide particle size range, this enhances the radiative cooling effect. The reason for this is likely that the inorganic powders, acting as scatterers, enhance the reflectivity of the fiber material in the solar spectrum through the Mie scattering effect; and as emitters, they further enhance the emissivity of the fiber material in the atmospheric window band, thereby improving the radiative cooling effect.

[0039] In one embodiment, the tungsten doping ratio in the tungsten-doped vanadium dioxide is 1.0 at.% to 1.5 at.%.

[0040] In one embodiment, the tungsten-doped vanadium dioxide has a particle size of 40 nm ± 10 nm.

[0041] In one embodiment, the method for preparing the modified tungsten-doped vanadium dioxide includes the following steps: dispersing tungsten-doped vanadium dioxide in an 80-85 wt% aqueous ethanol solution with a pH of 3-4, adding silane coupling agent KH-570, heating to 60-65℃ and stirring for 4-5 hours, cooling to 20-30℃ and continuing to stir for 2-3 hours, and obtaining modified tungsten-doped vanadium dioxide by washing and vacuum drying at 20-30℃.

[0042] In one embodiment, the mass ratio of tungsten-doped vanadium dioxide to aqueous ethanol solution is 5-8:100; In one embodiment, the raw materials for preparing the PMMA polymer shell containing methacryloxypropyl cage-type polysilsesquioxane include: methyl methacrylate, pentaerythritol tetraacrylate, and methacryloxypropyl cage-type polysilsesquioxane.

[0043] In one embodiment, the mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 1.5~3:2~4:0.3~0.9.

[0044] In one embodiment, the mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 0.5~1.0:0.2:100.

[0045] In one embodiment, the method for preparing the near-infrared modulated particles includes the following steps: Modified tungsten-doped vanadium dioxide, a compound emulsifier, and a polyvinyl alcohol aqueous solution were mixed evenly to form the aqueous phase.

[0046] Methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane were mixed evenly to form the oil phase.

[0047] The oil phase is added to the aqueous phase and stirred at 4000-4500 r / min to form a stable emulsion. Under nitrogen protection, ammonium persulfate is added dropwise, the temperature is raised to 80-85℃, the stirring speed is maintained at 400-500 r / min, and the polymerization reaction is carried out for 4-5 hours. After washing and vacuum drying, near-infrared regulated particles are obtained.

[0048] In one embodiment, the compound emulsifier is Tween 80 and Span 80 in a mass ratio of 4:1 to 1.3.

[0049] In one embodiment, the mass concentration of the polyvinyl alcohol aqueous solution is 0.8%.

[0050] In one embodiment, the volume ratio of the aqueous phase to the oil phase is 4~5:1.

[0051] In one embodiment, the amount of ammonium persulfate added is 1.3-2.0% of the mass of methyl methacrylate.

[0052] In one embodiment, the near-infrared modulated particles have a particle size of 50-85 nm.

[0053] This invention uses W-VO2, whose phase transition temperature is within the human comfort range, as the core for near-infrared regulation. When the ambient temperature is below its phase transition point, W-VO2 is in a monoclinic phase, and its near-infrared transmittance increases rapidly, enhancing its heat absorption capacity. When the temperature is above the phase transition point, W-VO2 transforms into the rutile phase, which has high near-infrared reflectivity and blocks heat. This near-infrared spectral regulation enables adaptive adjustment of the cooling effect, avoiding overcooling. However, W-VO2 is easily oxidized when directly introduced into the fiber system, and it has poor compatibility with fiber-forming polymers, failing to meet the requirements of subsequent melt spinning.

[0054] This invention effectively enhances the antioxidant properties of W-VO2 and improves its compatibility with fiber-forming polymers by using a PMMA polymer containing methacryloyloxypropyl cage-type polysilsesquioxane as the shell material to coat W-VO2, thus meeting the application requirements of melt spinning.

[0055] In one embodiment, the fiber-forming polymer is selected from at least one of carbon chain fibers or heterochain fibers.

[0056] In one embodiment, the fiber-forming polymer is selected from at least one of polyester, polyamide, polyurethane, polypropylene, polyacrylonitrile, polyethylene, or polyvinyl chloride.

[0057] In one embodiment, the polyester comprises at least one of polyethylene terephthalate, polybutylene terephthalate, or polypropylene terephthalate.

[0058] In one embodiment, the method for preparing the radiation cooling masterbatch includes the following steps: A premix is ​​obtained by mixing radiation-cooled composite powder, near-infrared modulated particles and fiber-forming polymer and then drying it. The premix is ​​then melt-extruded and pelletized.

[0059] In one embodiment, the drying temperature is 90~140°C and the time is 48 hours.

[0060] In one embodiment, the conditions for melt extrusion include: zone temperatures of 240~270℃ for zone 1, 250~270℃ for zone 2, 255~280℃ for zone 3, 255~275℃ for zone 4, and 260~275℃ for zone 5; screw speed of 200~600 r / min; and melt mixing time of 3~5 min.

[0061] In one embodiment, the fiber-forming polymer masterbatch is selected from at least one of polyester masterbatch, polyamide masterbatch, polyurethane masterbatch, polypropylene masterbatch, polyacrylonitrile masterbatch, polyethylene masterbatch, or polyvinyl chloride masterbatch.

[0062] Another aspect of the present invention provides a method for preparing a spectrally adaptive radiation cooling fiber, comprising the following steps: mixing radiation cooling masterbatch and fiber-forming polymer masterbatch, drying to obtain a mixture, and performing melt spinning on the mixture.

[0063] In one embodiment, the melt spinning conditions include: spinning zone 1 245-270℃, spinning zone 2 258-281℃, spinning zone 3 260-280℃, spinning metering pump temperature 261-280℃, spinning tube temperature 265-283℃, spinning box temperature 265-285℃, spinning cooling air temperature 20-22℃, spinning draw ratio 2.5-3 times, and spinning winding speed 2550-2700m / min.

[0064] This invention first prepares radiation-cooling composite powder and near-infrared modulation particles, then combines them with a fiber-forming polymer to form a masterbatch, and finally combines the masterbatch with the fiber-forming polymer to produce fibers through melt spinning. The raw materials have good compatibility, the product has good chemical stability, and it is fully compatible with existing chemical fiber industrial equipment, which greatly reduces the threshold and cost of large-scale production.

[0065] A third aspect of the present invention provides an application of a spectrally adaptive radiation-cooling fiber in fabric preparation.

[0066] Beneficial effects 1. In order to solve the above problems, the present invention provides a spectrum-adaptive radiation cooling fiber. By introducing a self-prepared radiation cooling masterbatch, the invention effectively solves the problems that the cooling effect of existing radiation cooling fibers is not adjustable and that tungsten-doped vanadium dioxide cannot meet the requirements of melt spinning process, thus better meeting the needs of practical applications.

[0067] 2. This invention introduces radiation-cooling composite powder and near-infrared regulating particles with radiation-cooling function into polymer fibers, enabling the fibers to possess excellent daytime radiation-cooling performance and near-infrared band regulation effect, thereby achieving dynamic control of radiation-cooling effect. At low temperatures, the near-infrared transmission performance in the solar spectrum is rapidly enhanced, increasing the heat input to the skin-fabric microenvironment and raising the temperature, thus avoiding "overcooling". At high temperatures, the high near-infrared reflectivity, together with the radiation-cooling composite powder, enhances the radiation-cooling effect, while maintaining good spinnability.

[0068] 3. The radiation-cooling composite powder prepared by the present invention, on the one hand, introduces different rare earth elements to make the rare earth aluminate compound have a high atmospheric window emissivity; on the other hand, by compounding with inorganic powder to prepare composite powder, the diversity of functional particle size is increased, effectively improving the scattering ability of solar band.

[0069] 4. This invention effectively enhances the antioxidant properties of W-VO2 and improves the compatibility between W-VO2 and fiber-forming polymers by coating W-VO2 with a PMMA polymer containing methacryloyloxypropyl cage-type polysilsesquioxane as the shell material. Attached Figure Description

[0070] Figure 1 The XRD patterns of rare earth aluminate compounds with different rare earth elements introduced in Examples 1-4 are shown.

[0071] Figure 2 The images are transmission electron microscope (TEM) images of tungsten-doped vanadium dioxide (left) and near-infrared modulated particles (right) in Example 1.

[0072] Figure 3 The figures show the XRD patterns of W-VO2 coated with high-temperature oxidation and the coated W-VO2. In the figures, 1 represents W-VO2 coated with high-temperature oxidation, and 2 represents W-VO2 after coating. Detailed Implementation

[0073] Example 1 In one aspect, Embodiment 1 of the present invention provides a spectrum-adaptive radiation cooling fiber, the raw materials for which, by weight, are: 40 parts of radiation cooling masterbatch and 60 parts of fiber-forming polymer masterbatch.

[0074] The raw materials for preparing the radiation cooling masterbatch, by weight, include 15 parts of radiation cooling composite powder, 5 parts of near-infrared modulation particles, and 80 parts of fiber-forming polymer. The raw materials for preparing the radiation-cooling composite powder include: rare earth aluminate compound, inorganic powder, and fatty acid modifier, wherein the mass ratio of the rare earth aluminate compound, inorganic powder, and fatty acid modifier is 50:12.5:6.25. The inorganic powder is aluminum phosphate. The fatty acid modifier is sodium fatty acid.

[0075] The near-infrared modulated particles use modified tungsten-doped vanadium dioxide as the core layer and a PMMA polymer containing methacryloyloxypropyl cage-type polysilsesquioxane as the shell layer.

[0076] The raw materials for preparing the rare earth aluminate compounds include aluminum salts, lanthanum salts, and rare earth compounds.

[0077] The rare earth compound is yttrium nitrate hexahydrate, the aluminum salt is aluminum nitrate nonahydrate, and the lanthanum salt is lanthanum nitrate hexahydrate.

[0078] The method for preparing the rare earth aluminate compound includes the following steps: A mixed salt solution was obtained by dissolving aluminum salt, lanthanum salt and rare earth compound in water, adding citric acid aqueous solution dropwise, and reacting at a constant temperature of 90°C to form a gel. The gel was then dried, ground, sieved and calcined to obtain rare earth aluminate compound.

[0079] The mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 187.5:173.2:38.3. The concentration of the citric acid aqueous solution is 2.41 mol / L.

[0080] The total mass concentration of aluminum salt, lanthanum salt and rare earth compounds in the mixed salt solution is 399 g / L.

[0081] The ratio of the added aluminum salt to the citric acid aqueous solution is 187.5g:0.1L.

[0082] The drying temperature is 80°C and the time is 6 hours.

[0083] The fineness of the grinding and sieving process is 200 mesh.

[0084] The calcination temperature was 1200℃ and the time was 3 hours.

[0085] The preparation method of the radiation-cooled composite powder includes the following steps: Rare earth aluminate compounds are dispersed with alcohol compounds and then ground to obtain a slurry. Fatty acid modifiers are added and stirred to dissolve the slurry. Inorganic powders are added and ultrasonically dispersed. After heating and stirring, the slurry is post-treated to obtain radiation-cooled composite powder.

[0086] The ratio of the rare earth aluminate compound to the alcohol compound is 50g:117mL.

[0087] The grinding conditions include: a ball mill, a rotation speed of 200 r / min, a grinding time of 6 h, and a sieve fineness of 400 mesh.

[0088] The ultrasonic dispersion time is 15 minutes.

[0089] The heating and stirring temperature is 60℃, and the time is 24h.

[0090] The post-processing includes the following steps: filtering the heated and stirred product, washing it, drying it at 60°C for 5 hours, and grinding it to obtain a radiation-cooled composite powder with a fineness of D100=2.0±0.2μm.

[0091] The raw materials for preparing the modified tungsten-doped vanadium dioxide include tungsten-doped vanadium dioxide (W-VO2) and KH-570, wherein the mass ratio of KH-570 to tungsten-doped vanadium dioxide is 0.5:5.

[0092] The tungsten-doped vanadium dioxide has a tungsten doping ratio of 1.5 at.%, a particle size of 40 nm ± 10 nm, and is model SS-VW50, sourced from Hangzhou Jikang New Materials Co., Ltd.

[0093] The method for preparing the modified tungsten-doped vanadium dioxide includes the following steps: dispersing tungsten-doped vanadium dioxide in an 85wt% aqueous ethanol solution with a pH of 3.5, adding silane coupling agent KH-570, heating to 60℃ and stirring for 5h, cooling to 25℃ and stirring for another 2h, and then washing and vacuum drying at 25℃ to obtain the modified tungsten-doped vanadium dioxide.

[0094] The mass ratio of tungsten-doped vanadium dioxide to ethanol aqueous solution is 5:100.

[0095] The raw materials for preparing the PMMA polymer shell containing methacryloxypropyl cage-type polysilsesquioxane include: methyl methacrylate, pentaerythritol tetraacrylate, and methacryloxypropyl cage-type polysilsesquioxane.

[0096] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 1.5:2:0.4.

[0097] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 0.5:0.2:100.

[0098] The preparation method of the near-infrared modulated particles includes the following steps: Modified tungsten doped vanadium dioxide, combined with an emulsifier and polyvinyl alcohol aqueous solution, were mixed evenly to form the aqueous phase.

[0099] Methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane were mixed evenly to form the oil phase.

[0100] The oil phase was added to the aqueous phase and stirred at 4000 r / min to form a stable emulsion. Under nitrogen protection, ammonium persulfate (2.0% of the mass of methyl methacrylate) was added dropwise, the temperature was raised to 80℃, and the stirring speed was maintained at 400 r / min for 5 h. After washing and vacuum drying at 25℃, near-infrared regulated particles were obtained.

[0101] The compound emulsifiers are Tween 80 and Span 80 in a mass ratio of 4:1.

[0102] The mass concentration of the polyvinyl alcohol aqueous solution is 0.8%.

[0103] The volume ratio of the aqueous phase to the oil phase is 4:1.

[0104] The near-infrared modulated particles have a particle size of 50-85 nm.

[0105] The fiber-forming polymer is PA6 (polyamide 6) masterbatch, commercially known as Nylon 6 bright chips, sourced from Jiangsu Haiyang Nylon New Material Co., Ltd.

[0106] The method for preparing the radiation refrigeration masterbatch includes the following steps: A premix is ​​obtained by mixing radiation-cooled composite powder, near-infrared modulated particles and fiber-forming polymer and then drying it. The premix is ​​then melt-extruded and pelletized using a single-screw extruder.

[0107] The drying temperature is 100℃ and the time is 48 hours.

[0108] The conditions for melt extrusion include: zone temperatures of 245°C in zone 1, 250°C in zone 2, 255°C in zone 3, 255°C in zone 4, and 260°C in zone 5; screw speed of 500 r / min; and melt mixing time of 3 min.

[0109] The fiber-forming polymer masterbatch is PA6 masterbatch, commercially known as Nylon 6 Bright Chips, and is sourced from Jiangsu Haiyang Nylon New Material Co., Ltd.

[0110] In another aspect, Embodiment 1 of the present invention provides a method for preparing a spectrally adaptive radiation cooling fiber, comprising the following steps: mixing radiation cooling masterbatch and fiber-forming polymer masterbatch, drying (drying at 100°C for 48 hours) to obtain a mixture, and then performing melt spinning on the mixture.

[0111] The conditions for melt spinning include: spinning zone 1 245℃, spinning zone 2 260℃, spinning zone 3 265℃, spinning metering pump temperature 263℃, spinning tube temperature 266℃, spinning box temperature 266℃, spinning cooling air temperature 22℃, spinning draw ratio 2.8 times, and spinning winding speed 2550m / min.

[0112] Example 2 Example 2 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 30 parts by weight of radiation cooling masterbatch and 70 parts by weight of fiber-forming polymer masterbatch.

[0113] The rare earth compound is gadolinium nitrate hexahydrate, and the mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 187.5:173.2:45.1; the total mass concentration of the aluminum salt, lanthanum salt, and rare earth compound in the mixed salt solution is 405.8 g / L. The inorganic powder is lanthanum phosphate and yttrium oxide in a mass ratio of 3:2.

[0114] The conditions for melt spinning include: spinning zone 1 247℃, spinning zone 2 258℃, spinning zone 3 262℃, spinning metering pump temperature 261℃, spinning tube temperature 265℃, spinning box temperature 265℃, spinning cooling air temperature 22℃, spinning draw ratio 2.8 times, and spinning winding speed 2550m / min.

[0115] Example 3 Example 3 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 30 parts by weight of radiation cooling masterbatch and 70 parts by weight of fiber-forming polymer masterbatch.

[0116] The rare earth compound is samarium nitrate hexahydrate, and the mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 187.5:173.2:44.45; the total mass concentration of the aluminum salt, lanthanum salt, and rare earth compound in the mixed salt solution is 405.15 g / L. The inorganic powder is gadolinium phosphate and yttrium oxide in a mass ratio of 3:3.

[0117] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.0:2.5:0.4.

[0118] The conditions for melt spinning include: spinning zone 1 245℃, spinning zone 2 258℃, spinning zone 3 260℃, spinning metering pump temperature 261℃, spinning tube temperature 265℃, spinning box temperature 265℃, spinning cooling air temperature 22℃, spinning draw ratio 3.0 times, and spinning winding speed 2600m / min.

[0119] Example 4 Example 4 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 50 parts by weight of radiation cooling masterbatch and 50 parts by weight of fiber-forming polymer masterbatch.

[0120] The rare earth compound is neodymium nitrate hexahydrate, and the mass ratio of the aluminum salt, lanthanum salt, and rare earth compound is 187.5:173.2:43.8; the total mass concentration of the aluminum salt, lanthanum salt, and rare earth compound in the mixed salt solution is 404.5 g / L. The inorganic powder is aluminum phosphate and gadolinium oxide in a mass ratio of 3:2.

[0121] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.0:2.5:0.6.

[0122] The conditions for melt spinning include: spinning zone 1 248℃, spinning zone 2 261℃, spinning zone 3 264℃, spinning metering pump temperature 264℃, spinning tube temperature 265℃, spinning box temperature 265℃, spinning cooling air temperature 22℃, spinning draw ratio 3.0 times, and spinning winding speed 2550m / min.

[0123] Example 5 Example 5 of the present invention provides a spectrally adaptive radiation-cooling fiber and its preparation method, the specific implementation of which is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation-cooling fiber include 20 parts by weight of radiation-cooling masterbatch and 80 parts by weight of fiber-forming polymer masterbatch. By weight, the raw materials for preparing the radiation-cooling masterbatch include 15 parts of radiation-cooling composite powder, 10 parts of near-infrared modulation particles, and 75 parts of fiber-forming polymer.

[0124] The inorganic powder is lanthanum phosphate and lutetium oxide in a mass ratio of 3:2.

[0125] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared regulated particles is 0.7:0.2:100.

[0126] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.5:3:0.6.

[0127] The conditions for melt spinning include: 250°C in spinning zone 1, 260°C in spinning zone 2, 264°C in spinning zone 3, 264°C in spinning metering pump, 266°C in spinning tube bending, 266°C in spinning box, 22°C in spinning cooling air, 3.0 times spinning draw ratio, and 2550 m / min spinning winding speed.

[0128] Example 6 Example 6 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 3, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 20 parts by weight of radiation cooling masterbatch and 80 parts by weight of fiber-forming polymer masterbatch.

[0129] The mass ratio of the rare earth aluminate compound, inorganic powder, and fatty acid modifier is 50:10:6. The inorganic powder is lanthanum phosphate and aluminum oxide in a mass ratio of 6:4.

[0130] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 0.8:0.2:100.

[0131] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.8:3.5:0.6.

[0132] The conditions for melt spinning include: spinning zone 1 270℃, spinning zone 2 281℃, spinning zone 3 280℃, spinning metering pump temperature 280℃, spinning tube temperature 283℃, spinning box temperature 285℃, spinning cooling air temperature 22℃, spinning draw ratio 2.9 times, and spinning winding speed 2700m / min.

[0133] Example 7 Example 7 of the present invention provides a spectrally adaptive radiation-cooling fiber and its preparation method, the specific implementation of which is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation-cooling fiber include 20 parts by weight of radiation-cooling masterbatch and 80 parts by weight of fiber-forming polymer masterbatch. By weight, the raw materials for preparing the radiation-cooling masterbatch include 15 parts of radiation-cooling composite powder, 10 parts of near-infrared modulation particles, and 75 parts of fiber-forming polymer.

[0134] The mass ratio of the rare earth aluminate compound, inorganic powder, and fatty acid modifier is 50:10:6. The inorganic powder is lanthanum phosphate, yttrium oxide, and aluminum oxide in a mass ratio of 4:3:3.

[0135] The ratio of the rare earth aluminate compound to the alcohol compound is 50g:142mL.

[0136] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 1.0:0.2:100.

[0137] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 3.0:3.5:0.9.

[0138] The conditions for melt extrusion include: zone temperatures of 250°C in zone 1, 262°C in zone 2, 270°C in zone 3, 276°C in zone 4, and 282°C in zone 5; screw speed of 300 r / min; and melt mixing time of 5 min.

[0139] The conditions for melt spinning include: spinning zone 1 270℃, spinning zone 2 281℃, spinning zone 3 280℃, spinning metering pump temperature 280℃, spinning tube temperature 283℃, spinning box temperature 285℃, spinning cooling air temperature 22℃, spinning draw ratio 2.9 times, and spinning winding speed 2700m / min.

[0140] Example 8 Example 8 of the present invention provides a spectrally adaptive radiation-cooling fiber and its preparation method, the specific implementation of which is the same as that of Example 2, except that the raw materials for preparing the temperature-responsive radiation-cooling fiber include 50 parts by weight of radiation-cooling masterbatch and 50 parts by weight of fiber-forming polymer masterbatch. By weight, the raw materials for preparing the radiation-cooling masterbatch include 15 parts of radiation-cooling composite powder, 10 parts of near-infrared modulation particles, and 75 parts of fiber-forming polymer.

[0141] The mass ratio of the rare earth aluminate compound, inorganic powder, and fatty acid modifier is 50:10:6. The inorganic powder is lanthanum phosphate, yttrium oxide, and magnesium oxide in a mass ratio of 4:3:3.

[0142] The ratio of the rare earth aluminate compound to the alcohol compound is 50g:142mL.

[0143] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 0.8:0.2:100.

[0144] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.8:4:0.6.

[0145] The conditions for melt extrusion include: zone temperatures of 240℃ in zone 1, 248℃ in zone 2, 252℃ in zone 3, 255℃ in zone 4, and 260℃ in zone 5; screw speed of 300 r / min; and melt mixing time of 4 min.

[0146] The conditions for melt spinning include: 250°C in spinning zone 1, 260°C in spinning zone 2, 264°C in spinning zone 3, 264°C in spinning metering pump, 266°C in spinning tube bending, 266°C in spinning box, 22°C in spinning cooling air, 3.0 times spinning draw ratio, and 2600 m / min spinning winding speed.

[0147] Example 9 Example 9 of the present invention provides a spectrally adaptive radiation-cooling fiber and its preparation method, the specific implementation of which is the same as that of Example 2, except that the raw materials for preparing the temperature-responsive radiation-cooling fiber include 20 parts by weight of radiation-cooling masterbatch and 80 parts by weight of fiber-forming polymer masterbatch. By weight, the raw materials for preparing the radiation-cooling masterbatch include 15 parts of radiation-cooling composite powder, 10 parts of near-infrared modulation particles, and 75 parts of fiber-forming polymer.

[0148] The mass ratio of the rare earth aluminate compound, inorganic powder, and fatty acid modifier is 50:10:6. The inorganic powder is yttrium phosphate, gadolinium oxide, and magnesium oxide in a mass ratio of 4:3:3.

[0149] The ratio of the rare earth aluminate compound to the alcohol compound is 50g:142mL.

[0150] The mass ratio of modified tungsten-doped vanadium dioxide, compound emulsifier, and polyvinyl alcohol aqueous solution in the near-infrared controlled particles is 0.6:0.2:100.

[0151] The mass ratio of methyl methacrylate, pentaerythritol tetraacrylate, and methacryloyloxypropyl cage-type polysilsesquioxane is 2.0:2.5:0.5.

[0152] The conditions for melt extrusion include: zone temperatures of 247°C in zone 1, 255°C in zone 2, 255°C in zone 3, 260°C in zone 4, and 265°C in zone 5; screw speed of 400 r / min; and melt mixing time of 4 min.

[0153] The conditions for melt spinning include: 250°C in spinning zone 1, 260°C in spinning zone 2, 264°C in spinning zone 3, 264°C in spinning metering pump, 266°C in spinning tube bending, 266°C in spinning box, 22°C in spinning cooling air, 2.8 times spinning draw ratio, and 2550 m / min spinning winding speed.

[0154] Example 10 Example 10 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 20 parts by weight of radiation cooling masterbatch (15 parts by weight of radiation cooling masterbatch in Example 9 and 5 parts by weight of radiation cooling masterbatch in Example 5) and 80 parts by weight of fiber-forming polymer masterbatch. The fiber-forming polymer masterbatch is PET masterbatch (polyester masterbatch), commercially known as Dayouguang fiber-grade PET chips, which are sourced from Jiangsu Silk Group Co., Ltd.

[0155] The conditions for melt spinning include: spinning zone 1 260℃, spinning zone 2 275℃, spinning zone 3 283℃, spinning metering pump temperature 283℃, spinning tube temperature 285℃, spinning box temperature 285℃, spinning cooling air temperature 22℃, spinning draw ratio 2.8 times, and spinning winding speed 2700m / min.

[0156] Example 11 Example 11 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 30 parts by weight of radiation cooling masterbatch (20 parts by weight of radiation cooling masterbatch in Example 7 and 10 parts by weight of radiation cooling masterbatch in Example 8) and 70 parts by weight of fiber-forming polymer masterbatch. The fiber-forming polymer masterbatch is PET masterbatch (polyester masterbatch), commercially known as Dayouguang fiber-grade PET chips, which are sourced from Jiangsu Silk Group Co., Ltd.

[0157] The conditions for melt spinning include: spinning zone 1 260℃, spinning zone 2 275℃, spinning zone 3 283℃, spinning metering pump temperature 283℃, spinning tube temperature 285℃, spinning box temperature 285℃, spinning cooling air temperature 22℃, spinning draw ratio 2.8 times, and spinning winding speed 2700m / min.

[0158] Example 12 Example 12 of the present invention provides a spectrally adaptive radiation cooling fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation cooling fiber include 30 parts by weight of radiation cooling masterbatch (25 parts by weight of radiation cooling masterbatch in Example 6 and 5 parts by weight of radiation cooling masterbatch in Example 9) and 70 parts by weight of fiber-forming polymer masterbatch.

[0159] The conditions for melt spinning include: 250°C in spinning zone 1, 260°C in spinning zone 2, 264°C in spinning zone 3, 264°C in spinning metering pump, 266°C in spinning tube bending, 266°C in spinning box, 22°C in spinning cooling air, 2.8 times spinning draw ratio, and 2550 m / min spinning winding speed.

[0160] Comparative Example 1 Comparative Example 1 of the present invention provides a spectrally adaptive radiation-cooling fiber and its preparation method, the specific implementation of which is the same as that of Example 1, except that the raw materials for preparing the temperature-responsive radiation-cooling fiber include 20 parts by weight of radiation-cooling masterbatch and 80 parts by weight of fiber-forming polymer masterbatch. By weight, the raw materials for preparing the radiation-cooling masterbatch include 20 parts by weight of radiation-cooling composite powder and 80 parts by weight of fiber-forming polymer.

[0161] The raw materials for preparing the radiation-cooled composite powder include: rare earth aluminate compounds and fatty acid modifiers, wherein the mass ratio of rare earth aluminate compounds to fatty acid modifiers is 50:5.

[0162] The raw materials for preparing the rare earth aluminate compound include aluminum salt and lanthanum salt (without rare earth compound), and the mass ratio of aluminum salt, lanthanum salt and rare earth compound is 187.5:173.2. The total mass concentration of aluminum salt, lanthanum salt and rare earth compound in the mixed salt solution is 360.7 g / L.

[0163] Comparative Example 2 Comparative Example 2 of the present invention provides a spectrally adaptive radiation-cooling fiber, the specific implementation of which is the same as that of Example 1, except that, by weight, the raw materials for preparing the radiation-cooling masterbatch include 20 parts of radiation-cooling composite powder and 80 parts of fiber-forming polymer. The raw materials for preparing the radiation-cooling composite powder include: rare earth aluminate compound and fatty acid modifier, wherein the mass ratio of the rare earth aluminate compound and the fatty acid modifier is 50:5.

[0164] Comparative Example 3 Comparative Example 3 of the present invention provides a polyester fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that, by weight, the raw materials for preparing the radiation cooling masterbatch include 20 parts of radiation cooling composite powder and 80 parts of fiber-forming polymer; the inorganic powder is lanthanum phosphate and lutetium oxide in a mass ratio of 3:2.

[0165] Comparative Example 4 Comparative Example 4 of the present invention provides a polyester fiber and its preparation method. The specific implementation method is the same as that of Example 1, except that, by weight, the raw materials for preparing the radiation cooling masterbatch include 15 parts of radiation cooling composite powder, 5 parts of tungsten-doped vanadium dioxide (W-VO2) and 85 parts of fiber-forming polymer; the inorganic powder is lanthanum phosphate and lutetium oxide in a mass ratio of 3:2.

[0166] Performance testing 1. Fiber pretreatment: The fibers prepared in the examples and comparative examples were selected and twill fabrics S1-S12 and D1-D4 were woven on a loom with a warp and weft density of 98*72 threads / cm. The following tests were carried out and the results are shown in Table 1 and Table 2.

[0167] (1) Tensile strength test: Refer to standard GB / T14344-2008 "Test method for tensile properties of chemical fiber filaments". The test results are shown in Table 1.

[0168] (2) Reflectance test: The reflectance of the fabric in the visible-near infrared band was measured using an ultraviolet-visible-near infrared spectrophotometer with an integrating sphere. The model was Lambda75s. The test results are shown in Table 1.

[0169] Near-infrared modulation rate = 780~2500nm reflectance （35℃） -780~2500nm reflectivity （27℃） (3) Emissivity test: The absorbance of the fabric in the atmospheric window band was measured using a Fourier transform infrared spectrometer with an integrating sphere. According to Kirchhoff's law, when an object is in thermal equilibrium, the emissivity equals the absorptivity. The model was Thermo Fisher Scientific-NEXUS-670. The test results are shown in Table 1.

[0170] (4) Radiative cooling performance test: The thermocouple was placed close to the bottom of the fabric, and the temperature of the bottom of the fabric was recorded. At the same time, the ambient temperature was also recorded. The greater the temperature difference between the bottom of the fabric and the ambient temperature, the better the cooling effect. The test results are shown in Table 1.

[0171] —Equation (1) (5) Radiative cooling temperature regulation performance test: Select a sunny summer day from 6:00 to 6:30 am with a wind speed of 1 to 2 and an average temperature of 28±1℃. From 1:00 to 1:30 pm with a wind speed of 1 to 2 and an average temperature of 38±1℃, under direct sunlight, cover the tester’s skin surface with the tester’s body temperature of 36.6±0.5℃. Thermocouple patches are attached to the skin surface and the bottom of the fabric. The temperature of the human skin surface and the temperature of the bottom of the fabric are measured by thermocouples. The difference between the human skin surface temperature and the bottom of the fabric is used to characterize the radiative cooling temperature regulation effect. The test results are shown in Table 2.

[0172] —Equation (2) Table 1 Results of Performance Tests 1-4

[0173] Note: " / " in Table 1 indicates that no test was performed because no near-infrared modulation particles were added, and therefore the device does not have temperature response performance.

[0174] Table 1 shows the test data of fabrics D1-D3 prepared from fibers in Examples 1-3. It can be seen that the solar reflectance and 8-13 micrometer emissivity of the fabrics prepared by using yttrium-doped lanthanum aluminate and compounding it with inorganic powder as functional powders were gradually improved. Furthermore, the fabrics S1-S12 prepared from fibers in Examples 1-12 show that rare earth element doping, inorganic powder compounding, and the introduction of near-infrared modulating particles not only give the fabrics high solar reflectance and 8-13 micrometer emissivity, but also allow the near-infrared reflectance regulation rate to be controlled between 22.6% and 36.2% by temperature as a switch. The trend of the temperature difference between the fabric and the environment at high and low temperatures is also consistent with the regulation trend. The fabric D4 prepared from the fiber of Comparative Example 4 has slightly higher solar reflectance and emissivity of 8-13 micrometers than the fabric S5 prepared from the fiber of Example 5. This is consistent with the spectral performance change after vanadium dioxide is oxidized to vanadium pentoxide. However, D4 does not have the adjustment function (the adjustment rate of 0.5% may be due to a very small amount of unoxidized vanadium dioxide).

[0175] Table 2. Test results of radiant cooling temperature control performance.

[0176] Note: " / " in Table 2 indicates that no test was performed because no near-infrared modulation particles were added, and therefore the device does not have temperature response performance.

[0177] Table 2 clearly shows that the temperature difference between the fabric and the human skin surface is smaller at 6-7 am (lower temperatures) than at 1-2 pm (higher temperatures). Furthermore, at higher temperatures, the fabric exhibits a significant cooling effect due to its efficient radiative cooling mechanism, demonstrating its ability to regulate the microclimate temperature of the human body. It is speculated that this function arises from the fabric's ability to reduce radiative cooling at lower temperatures by allowing near-infrared heat input, preventing overcooling. At higher temperatures, it isolates near-infrared heat input, enhancing the radiative cooling effect and resulting in a more pronounced cooling sensation for the human body.

[0178] 2. Infrared-modulated particle antioxidant test The dark black W-VO2 and the dark black coated W-VO2 (infrared-controlled particles prepared in Example 1) were placed in a muffle furnace under an air atmosphere. The muffle furnace was set with the following parameters: temperature 290℃, heating time 20 min, and holding time 10 min. The antioxidant test results of the infrared-controlled particles are shown in Table 3.

[0179] Table 3

[0180] After high-temperature oxidation, the color of W-VO2 changed from black to light orange, clearly indicating it was no longer W-VO2 and requiring no further confirmation. The color of W-VO2 did not change significantly after high-temperature oxidation and coating. XRD analysis was performed on both W-VO2 and coated W-VO2 to further confirm the phase composition after high-temperature oxidation. Figure 3 It can be seen that the W-VO2 peaks after high-temperature oxidation coating are consistent and show obvious characteristic peaks of M-phase VO2, indicating that the shell has an antioxidant protective effect.

Claims

1. A spectrally adaptive radiative cooling fiber, characterized in that, The preparation raw materials of the radiation refrigeration master batch include, by weight parts, 20-50 parts of the radiation refrigeration master batch and 50-80 parts of the fiber-forming polymer master batch; The preparation raw materials of the radiation refrigeration master batch include, by weight parts, 5-20 parts of the radiation refrigeration composite powder, 5-10 parts of the near-infrared regulating particle and 75-80 parts of the fiber-forming polymer. The preparation raw materials of the radiation refrigeration composite powder include a rare earth aluminates compound, an inorganic powder and a fatty acid modifier. The near-infrared regulating particle is of a core-shell structure, the modified tungsten-doped vanadium dioxide is used as the core layer, and the PMMA polymer containing the methylacryloxypropyl cage polysilsesquioxane is used as the shell layer.

2. The fiber according to claim 1, characterized in that, The mass ratio of the rare earth aluminates compound, the inorganic powder and the fatty acid modifier is 50:10-12.5:6-6.

25.

3. The fiber according to claim 1, wherein The preparation raw materials of the rare earth aluminates compound include an aluminum salt, a lanthanum salt and a rare earth compound, and the mass ratio of the aluminum salt, the lanthanum salt and the rare earth compound is 170-190:160-180:30-50.

4. The fiber according to claim 3, characterized in that, The rare earth compound is a rare earth compound containing any one of yttrium, ytterbium, samarium, neodymium, gadolinium, europium, erbium or cerium.

5. The fiber according to claim 1, wherein The particle size of the inorganic powder is 0.3-1.8 μm.

6. The fiber according to claim 1, wherein The inorganic powder is selected from at least one of phosphate, rare earth oxide, aluminum phosphate, aluminum oxide, zinc oxide or magnesium oxide.

7. The fiber according to claim 1, wherein The preparation raw materials of the modified tungsten-doped vanadium dioxide include tungsten-doped vanadium dioxide and KH-570, and the amount of the KH-570 is 8-14% of the mass of the tungsten-doped vanadium dioxide.

8. The fiber according to claim 1, wherein The preparation raw materials of the PMMA polymer shell layer containing the methylacryloxypropyl cage polysilsesquioxane include methyl methacrylate, pentaerythritol tetraacrylate and methylacryloxypropyl cage polysilsesquioxane, and the mass ratio of the methyl methacrylate, the pentaerythritol tetraacrylate and the methylacryloxypropyl cage polysilsesquioxane is 8:2:1.4-2.

0.

9. A process for the preparation of the fibre according to any one of claims 1 to 8, characterised in that, The method includes the following steps: mixing the radiation refrigeration master batch and the fiber-forming polymer master batch, drying to obtain a mixture, and melt spinning the mixture.

10. Use of the fibre according to any one of claims 1-8, characterized in that, The method is applied to fabric preparation.

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