A temperature self-regulating hollow network yarn and its preparation method and application

Abstract

The present invention discloses a temperature-self-regulating hollow network yarn, a preparation method and an application thereof. The preparation method uses a coaxial electrospinning method to prepare two hollow fibers mixed with microcapsules. During the preparation, a silver nitrate solution is used as a core layer spinning solution, and carbon aerogel is injected into the hollow fibers respectively. The fibers are then compounded through a network nozzle. The prepared hollow network yarn retains and improves the durability of the synthetic fiber while ensuring its fluffiness and softness, overcomes the disadvantage of insufficient hygroscopicity of the synthetic fiber, and also has the advantages of temperature-sensitive adaptive adjustment function, good portability and the like.

Description

Technical Field

[0001] The present invention relates to the field of network yarn preparation, and in particular to a temperature-self-regulating hollow network yarn and a preparation method and application thereof. Background Art

[0002] Interwoven yarn refers to the filaments that are entangled with each other in the network nozzle under the action of the jet air flow to form a periodic network point. It is also called interwoven yarn or air-jet interwoven yarn.

[0003] The types of interwoven yarns are:

[0004] (1) Interwoven textured yarn (interwoven low-elastic yarn) is made by interweaving stretched textured yarn and textured yarn, with an interweaving degree of 80-90 yarns / m. It is the most widely used interwoven yarn. It can be directly used for weaving without the need for doubling, twisting, and sizing. The fabric has a certain fuzzy feel, is linty and pilling-free, and has a soft luster.

[0005] (2) POY (pre-oriented yarn) interlaced yarn is made by interlacing POY, with an interlacing degree of 4-8 per meter. It has better cohesion and unwinding properties than POY, and is less likely to produce broken yarns, lint, and loose yarns during stretching and twisting.

[0006] (3) FDY (fully drawn yarn) interlaced yarn is made by interlacing FDY with an interlacing degree of 15-70 pieces / m. It can be directly used for weaving processing without twisting and sizing.

[0007] (4) Blended interwoven yarn is made by twisting and intertwining different synthetic fiber filaments. It can improve the gloss, dyeability and other wearing properties of synthetic fiber filaments.

[0008] With the gradual improvement of the diversity of application materials and the wide range of performance, the development direction of network yarns needs to be developed in the direction of high-performance modification. In the existing research on the modification of network yarns, there are many studies on improving the feel, fluffiness and durability of network yarns, but there are few studies on properties such as temperature regulation and hygroscopicity. Most methods of regulating temperature still stay in applying temperature-sensitive particles or impregnating phase change energy storage materials on the fiber surface. This method not only has the disadvantage of short service life, but may also cause the feel of the material itself to decrease, affecting the overall quality of the material; for example, someone proposed using honeycomb dioxide to improve the feel of the fiber. Silicon is used as a carrier, and phase-change paraffin is filled and encapsulated inside to achieve the function of regulating temperature. However, the process has the disadvantage of complicated steps, and polluting inorganic substances such as paraffin are limited in their application fields. In addition, the feel of the fiber material with added silica-paraffin particles will be reduced; most studies on improving hygroscopicity have sacrificed wearing performance or increased costs, such as thickening and densifying the tissue or performing high-hygroscopicity finishing; and for the lightness and other properties of the network silk product itself, most choose to use materials with lower molecular weight or polymerization degree to control the quality of the product, but this method often also reduces the durability and feel of the product. Summary of the Invention

[0009] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a new method for preparing temperature-self-regulating hollow network fibers. The network fibers prepared by this method retain and improve the durability of synthetic fibers while ensuring fluffiness and softness, and overcome the disadvantage of insufficient hygroscopicity of synthetic fibers. At the same time, they also have the function of temperature-sensitive adaptive adjustment and good portability.

[0010] The present invention also provides a temperature self-regulating hollow network filament prepared by the above method.

[0011] The present invention also provides an application of the temperature self-regulating hollow network yarn prepared by the above method in the preparation of thermal insulation clothing.

[0012] In order to achieve the above object, a technical solution adopted by the present invention is:

[0013] A method for preparing a temperature-self-regulating hollow network yarn, the method comprising:

[0014] (1) dispersing polyacrylonitrile in a first organic solvent, adding microcapsules, and mixing to prepare a first spinning solution, using the first spinning solution as a sheath spinning solution and a silver nitrate solution as a core spinning solution, and preparing a modified polyacrylonitrile hollow fiber by a coaxial electrospinning method;

[0015] Dispersing polylactic acid in a second organic solvent, adding microcapsules, and mixing to prepare a second spinning solution, using the second spinning solution as a sheath spinning solution and a silver nitrate solution as a core spinning solution to prepare a modified polylactic acid hollow fiber by a coaxial electrospinning method;

[0016] (2) injecting carbon aerogel into the modified polyacrylonitrile hollow fiber and the modified polylactic acid hollow fiber respectively, sealing them after injection, and then compounding the two into a network filament through a network nozzle, and irradiating them with ultraviolet light;

[0017] The preparation method of the microcapsules comprises: emulsifying n-octadecane and methyl methacrylate in the presence of an anionic surfactant, and then polymerizing them under heating conditions in a protective atmosphere.

[0018] According to some preferred aspects of the present invention, during the preparation of modified polyacrylonitrile hollow fibers, the amount of microcapsules added to the first spinning solution is 5%-10%, and the amount of polyacrylonitrile added to the first spinning solution is 40%-50%, calculated by mass percentage.

[0019] According to some preferred aspects of the present invention, during the preparation of the modified polylactic acid hollow fiber, the amount of microcapsules added to the second spinning solution is 5%-10%, and the amount of polylactic acid added to the second spinning solution is 40%-50%, calculated by mass percentage.

[0020] According to some preferred aspects of the present invention, during the preparation of modified polyacrylonitrile hollow fibers or modified polylactic acid hollow fibers, the microcapsules are added in the form of an emulsion.

[0021] Furthermore, the emulsion form of the microcapsules is obtained by emulsifying n-octadecane and methyl methacrylate in water in the presence of an anionic surfactant, and then polymerizing them at 70-80° C. in a protective atmosphere to obtain a microcapsule emulsion in the form of an emulsion after the polymerization is completed.

[0022] In some embodiments of the present invention, the protective atmosphere is formed by introducing nitrogen gas.

[0023] According to some preferred aspects of the present invention, the molar ratio of n-octadecane, methyl methacrylate and anionic surfactant is 1:3-5:0.8-1.2.

[0024] According to some preferred aspects of the present invention, the anionic surfactant is sodium α-olefin sulfonate.

[0025] According to some preferred aspects of the present invention, in the process of preparing modified polyacrylonitrile hollow fibers or modified polylactic acid hollow fibers, the silver nitrate solution is an aqueous solution of silver nitrate with a concentration of 0.1 wt% to 1.0 wt%.

[0026] According to some preferred aspects of the present invention, the first organic solvent is N,N-dimethylformamide, and the second organic solvent is dimethylacetamide.

[0027] According to some preferred aspects of the present invention, the amount of carbon aerogel added to the modified polyacrylonitrile hollow fiber is 0.1%-0.5% by mass of the modified polyacrylonitrile hollow fiber;

[0028] In the modified polylactic acid hollow fiber, the added amount of carbon aerogel accounts for 0.1%-0.5% by mass of the modified polylactic acid hollow fiber.

[0029] According to some preferred aspects of the present invention, the carbon aerogel is injected into the modified polyacrylonitrile hollow fiber or the modified polylactic acid hollow fiber by means of hot air blowing.

[0030] Furthermore, the temperature of the hot air flow blowing the carbon aerogel is 150-180° C., which can partially melt the hollow fibers and generate some entanglement points, thereby reducing the escape of the carbon aerogel.

[0031] According to some preferred aspects of the present invention, in the process of preparing modified polyacrylonitrile hollow fibers, the spinning process parameters are: output voltage of 0-50 kV, output current of 0.5-1.5 mA, micro-step advancement distance of the syringe pump of 0.1-0.2 μm, and spinneret diameter of 1-6 mm;

[0032] In the process of preparing modified polylactic acid hollow fibers, the spinning process parameters are: output voltage of 0-50 kV, output current of 0.5-1.5 mA, micro-step advancement distance of the injection pump of 0.1-0.2 μm, and spinneret diameter of 1-6 mm.

[0033] According to some preferred aspects of the present invention, the gas pressure at the network nozzle is 0.1-0.5 MPa, the gas temperature is 150-180°C, and the use of the blowing effect of the hot air flow and the cross-linking and entanglement of the two components of the hollow fibers can enable the carbon aerogel to be stored in sections inside the hollow fibers and play a good sealing role, and can keep the escape rate of the carbon aerogel within 5% of the injected mass.

[0034] Another technical solution provided by the present invention is a temperature-self-regulating hollow network fiber made by the above-mentioned preparation method.

[0035] Another technical solution provided by the present invention is an application of the temperature self-regulating hollow network yarn described above in thermal clothing.

[0036] In the present invention, the carbon aerogel can be prepared according to conventional methods in the art.

[0037] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0038] Based on the deficiencies of fibers, especially network fibers, in the prior art in terms of hygroscopicity, temperature self-regulation, and durability, the inventors of the present invention innovatively proposed using two specific materials and a coaxial electrospinning method to prepare hollow fibers. In particular, specific microcapsules are added to the sheath spinning solution, and a silver nitrate solution is used as the core spinning solution. This not only allows the prepared hollow fibers to contain microcapsule particles, but also allows the silver ions contained in the silver nitrate solution to adhere to the inner wall surface of the hollow fibers after the solvent evaporates, and can gradually be in situ reduced to nanosilver particles with a face-centered cubic structure under natural conditions. The internal cavity can increase the thermal energy storage capacity and the thermal conductivity of the product, while exhibiting strong chemical, thermal, and morphological stability. In addition, the participation of the silver nitrate solution in coaxial electrospinning also reduces the use of organic solvents.

[0039] At the same time, carbon aerogel is further injected into the prepared hollow fiber, which is then compounded into a network filament and accelerated to form silver nanoparticles under ultraviolet light irradiation. The carbon aerogel is filled inside, which not only makes the network filament have good softness and feel, but also keeps the breaking strength of the product at a high level while ensuring light weight. The pressurized hot air flow used to fill the aerogel can locally melt the hollow fiber, generate some entanglement points, reduce the escape of carbon aerogel, and increase the service life of the fiber material; during the network nozzle processing process, the blowing effect of the hot air flow and the cross-linking and entanglement of the two components of the hollow fiber can make the carbon aerogel stored in sections inside the hollow fiber and play a good sealing role, which can keep the escape rate of the carbon aerogel within 5% of the injected mass.

[0040] The present invention achieves excellent temperature self-regulation through the synergistic effects of multiple methods, such as the formation of the hollow fibers, the inclusion of microcapsule particles, the injection of carbon aerogel, and the surface attachment of nanosilver particles with a face-centered cubic structure. Furthermore, the network yarn of the present invention overcomes the inherent shortcomings of polyacrylonitrile fibers, such as insufficient strength and air permeability, improves the disadvantage of insufficient hygroscopicity of synthetic fibers themselves, enhances the durability of the fibers, and provides a good hand feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0042] Figure 1 Schematic diagram of the process of injecting carbon aerogel by blowing in an embodiment of the present invention;

[0043] 1. Hollow fiber; 2. Carbon aerogel travel path; 3. Hot air flow; 4. Load-bearing pressurized chamber; 5. Compressed carbon aerogel. DETAILED DESCRIPTION

[0044] The above scheme is further described below in conjunction with specific examples; it should be understood that these examples are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following examples; the implementation conditions adopted in the examples can be further adjusted according to specific requirements, and the implementation conditions not specified are generally the conditions in routine experiments.

[0045] Unless otherwise specified in the following examples, all raw materials were purchased from commercial sources or prepared by conventional methods in the art.

[0046] In the following, the microcapsule emulsion is obtained by mixing n-octadecane (2.5 g) and methyl methacrylate (10.4 mL) in a heated environment at 40° C., then adding 100 mL of an aqueous solution of sodium α-olefin sulfonate (0.01 mol of sodium α-olefin sulfonate), stirring, shearing and emulsifying for 40 minutes, and then polymerizing at 75° C. in a nitrogen atmosphere for 12 hours to obtain a microcapsule emulsion in the form of an emulsion after completion of the polymerization.

[0047] In the following, carbon aerogel is obtained by: 20 mL of a 1.5 wt% aqueous solution of resorcinol (1,3-dihydroxybenzene) and 10 mL of a 0.9 wt% aqueous solution of formaldehyde (HCOH) are subjected to sol-gel polymerization in 150 mL of a 0.01 wt% caustic soda solution, followed by supercritical drying (the medium for supercritical drying is CO2 gas) and carbonization in an N2 atmosphere at a temperature of 700°C to obtain carbon aerogel.

[0048] Example 1

[0049] This example provides a temperature-self-regulating hollow network yarn and a preparation method thereof. The preparation method of the temperature-self-regulating hollow network yarn includes:

[0050] (1) Polyacrylonitrile (purchased from Aladdin Reagent, brand MFCD00084395) was dispersed in N,N-dimethylformamide, and microcapsule emulsion was added and mixed to prepare a first spinning solution. The first spinning solution was used as the skin spinning solution, and a silver nitrate solution with a mass percentage of 0.5wt% was used as the core spinning solution. Modified polyacrylonitrile hollow fibers were prepared by a coaxial electrospinning method. In terms of mass percentage, the amount of microcapsules added accounted for 10% of the first spinning solution, and the amount of polyacrylonitrile added accounted for 50% of the first spinning solution. The spinning process parameters were: input voltage 220V, output voltage 0-50kV, output current 1mA; the injection pump had a microstep advance distance of 0.165μm per microstep, and the spinneret diameter was 2mm.

[0051] Polylactic acid (purchased from MacLean Reagent, brand MFCD00131929) was dispersed in dimethylacetamide, and a microcapsule emulsion was added and mixed to form a second spinning solution. The second spinning solution was used as the sheath spinning solution, and a silver nitrate solution was used as the core spinning solution. Modified polylactic acid hollow fibers were prepared by a coaxial electrospinning method. The microcapsules accounted for 10% of the second spinning solution and the polylactic acid accounted for 50% of the second spinning solution in terms of weight percentage. The spinning process parameters were: input voltage 220V, output voltage 0-50kV, output current 1mA; the syringe pump had a microstep advance distance of 0.165μm per microstep, and the spinneret diameter was 2mm.

[0052] (2) Injecting carbon aerogel into the modified polyacrylonitrile hollow fiber and the modified polylactic acid hollow fiber respectively, wherein the amount of carbon aerogel added to the modified polyacrylonitrile hollow fiber is 0.5% by weight of the hollow fiber.

[0053] In the modified polylactic acid hollow fiber, the amount of carbon aerogel added is 0.5% by mass of the hollow fiber;

[0054] The method of injecting carbon aerogel is to use hot air blowing, and the hot air temperature is 170℃. The process is as follows: Figure 1 As shown, the carbon aerogel is compressed in the load-bearing pressurized chamber 4, and the compressed carbon aerogel 5 is densely distributed on one side of the outlet of the load-bearing pressurized chamber 4. Then, under the pressure of the hot air flow 3, the compressed carbon aerogel 5 is rapidly ejected outward from the outlet and enters the middle space of the hollow fiber 1. The carbon aerogel travel path 2 extends along the middle space until the preset addition amount is injected;

[0055] After injection, the carbon aerogel-infused modified polyacrylonitrile hollow fibers and modified polylactic acid hollow fibers were passed through a network nozzle (gas pressure of 0.15 MPa and gas temperature of 170°C) to form a composite network yarn. The yarn was then exposed to ultraviolet light (wavelength approximately 254 nm) for three hours to produce a temperature-self-regulating hollow network yarn. During the network nozzle treatment, the high temperature and stress caused the hollow fibers to entangle with each other, sealing the carbon aerogel within the hollow fibers and preventing it from escaping. The material was cooled and set before testing.

[0056] Example 2

[0057] The method is basically the same as Example 1, except that, in terms of mass percentage, the amount of microcapsules added to the first spinning solution is 5%, and the amount of polyacrylonitrile added to the first spinning solution is 40%.

[0058] Calculated by mass percentage, the added amount of microcapsules accounts for 5% of the second spinning solution, and the added amount of polylactic acid accounts for 40% of the second spinning solution.

[0059] Everything else remains unchanged.

[0060] Example 3

[0061] The method is basically the same as Example 1, except that: the amount of carbon aerogel added to the modified polyacrylonitrile hollow fiber is 0.1% by mass of the hollow fiber;

[0062] In the modified polylactic acid hollow fiber, the amount of carbon aerogel added is 0.1% by mass of the hollow fiber.

[0063] Everything else remains unchanged.

[0064] Comparative Example 1

[0065] The process is basically the same as Example 1, except that no microcapsule emulsion is added in the preparation of modified polyacrylonitrile hollow fibers and modified polylactic acid hollow fibers.

[0066] Everything else remains unchanged.

[0067] Comparative Example 2

[0068] The method is basically the same as Example 1, except that the silver nitrate solution is replaced with N,N-dimethylformamide in the preparation of the modified polyacrylonitrile hollow fiber.

[0069] In the preparation of modified polylactic acid hollow fibers, the silver nitrate solution was replaced by dimethylacetamide.

[0070] Everything else remains unchanged.

[0071] Comparative Example 3

[0072] The method is basically the same as Example 1, with the only difference being that the step of injecting carbon aerogel is omitted.

[0073] Everything else remains unchanged.

[0074] Performance Testing

[0075] The network yarns prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests, respectively. The specific results are shown in Table 1.

[0076] Table 1

[0077]

[0078]

[0079] 1: The average breaking strength (cN) and average breaking elongation (%) of the products tested in this invention are based on the standard "GB9997-1988 Determination of breaking strength and elongation of chemical fibers". The average breaking strength is the average of the forces used when several samples of equal size are stretched to break, expressed as: The average elongation at break of a sample is the ratio of the sum of the elongations at break of the specimens to the product of the number of tests and the nominal gauge, expressed as: Wherein, the nominal gauge distance L is set according to the average length of the fiber specimen. When the length of the specimen exceeds 35 mm, L is 20 mm. When the length of the specimen is less than 35 mm, L is 10 mm.

[0080] 2: The inclined plane method used in this invention tests the bending length (l) of the sample to characterize the softness of the sample. Referring to the standard "GB / T18318.1-2009 Determination of the flexural properties of textiles", the length of the sample when it is bent to 7.1° under the action of its own weight is measured with one end of the sample clamped and the other end suspended. It is used to characterize the flexibility of the sample.

[0081] 3: The yarn weight (M) measured in the present invention is defined as the weight of one kilometer of yarn, calculated in grams.

[0082] 4: The thermal conductivity coefficient θ measured in this experiment is based on the standard "GB-T 3139-2005 Test method for thermal conductivity of fiber-reinforced plastics". The test method is the guarded hot plate method, which means that under stable conditions, a unidirectional heat flow flows vertically through a plate-shaped specimen. By measuring the one-dimensional constant heat flow in a specified heat transfer area and the temperature difference between the hot and cold surfaces of the specimen, the thermal conductivity of the specimen can be calculated. The calculation is: Where, The power of the main heating plate when it is stable, the unit is w, d is the thickness of the sample, the unit is m, A is the area of the main heating plate, the unit is m 2 , t1 and t2 are the high temperature and low temperature of the sample respectively, in °C.

[0083] 5: The test method for the thermal storage performance of fabrics used in this experiment is based on the standard "GB / T 18319-2019 Test method for the thermal storage performance of textiles". The specific method is to use a certain light source as the irradiation light source, place the sample under a certain irradiation intensity, and the sample will produce a temperature change due to the absorption of light energy. The temperature of the sample is tested with a temperature sensor, and the temperature change of the sample after 10 minutes of irradiation and 10 minutes of irradiation is recorded. The temperature rise value ΔT of the sample at that time point is calculated. i =T i -T 0i Among them, T i and T 0iRespectively represent the temperature of the sample and the temperature of the environment at time i. By measuring multiple temperature rise values within 20 minutes, the average temperature rise value is calculated. Where n is the number of recordings. According to standard calculations, when this value is ≥4.4K, the material is said to have heat storage properties.

[0084] 6: The abrasion resistance test method used in this experiment is based on the standard "GB / T 21196.1-2007 Textiles - Determination of the Abrasion Resistance of Fabrics by the Martindale Method." Specifically, the material to be tested is made into a 60 x 180 mm long specimen. This specimen is then placed on a Martindale abrader and abraded at a constant speed and intervals. The number of frictions is recorded when the specimen is completely worn away. A higher number of frictions indicates better abrasion resistance.

[0085] 7: The hygroscopicity characterization method used in this experiment is based on the standard "GB / T 21655.1 Evaluation of Moisture Absorption and Quick-Drying Properties of Textiles - Part 1: Unidirectional Combined Test Method." Specifically, the ratio of the sample mass to the sample mass is measured after the sample is completely soaked for 5 minutes, after which the sample is removed and allowed to drip naturally. A value ≥ 100% indicates good hygroscopicity, while a value ≥ 200% indicates high hygroscopicity.

[0086] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

[0087] The endpoints of the ranges and any values disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

Claims

1. A method for preparing a temperature self-regulating hollow network fiber, characterized in that: The preparation method comprises: (1) dispersing polyacrylonitrile in a first organic solvent, adding microcapsules, and mixing to prepare a first spinning solution, using the first spinning solution as a sheath spinning solution and a silver nitrate solution as a core spinning solution, and preparing a modified polyacrylonitrile hollow fiber by a coaxial electrospinning method; Dispersing polylactic acid in a second organic solvent, adding microcapsules, and mixing to prepare a second spinning solution, using the second spinning solution as a sheath spinning solution and a silver nitrate solution as a core spinning solution to prepare a modified polylactic acid hollow fiber by a coaxial electrospinning method; (2) injecting carbon aerogel into the modified polyacrylonitrile hollow fiber and the modified polylactic acid hollow fiber respectively, sealing them after injection, and then compounding the two into a network fiber through a network nozzle, and irradiating them with ultraviolet light; The preparation method of the microcapsules comprises: emulsifying n-octadecane and methyl methacrylate in the presence of an anionic surfactant, and then polymerizing them under heating conditions in a protective atmosphere; Injecting the carbon aerogel into the modified polyacrylonitrile hollow fiber or the modified polylactic acid hollow fiber by blowing hot air, wherein the temperature of the hot air is 150-180° C.; The gas pressure at the network nozzle is 0.1-0.5 MPa, and the gas temperature is 150-180°C.

2. The method for preparing the temperature self-regulating hollow network yarn according to claim 1, characterized in that: In the process of preparing the modified polyacrylonitrile hollow fiber, the amount of microcapsules added to the first spinning solution is 5%-10%, and the amount of polyacrylonitrile added to the first spinning solution is 40%-50% by weight. In the process of preparing the modified polylactic acid hollow fiber, the added amount of the microcapsules accounts for 5%-10% of the second spinning solution, and the added amount of the polylactic acid accounts for 40%-50% of the second spinning solution, calculated by weight percentage.

3. The method for preparing the temperature self-regulating hollow network yarn according to claim 1, characterized in that: In the process of preparing modified polyacrylonitrile hollow fibers or modified polylactic acid hollow fibers, the microcapsules are added in the form of an emulsion; The emulsion form of the microcapsules is obtained by emulsifying n-octadecane and methyl methacrylate in water in the presence of an anionic surfactant, and then polymerizing them at 70-80° C. in a protective atmosphere to obtain a microcapsule emulsion in the form of an emulsion after the polymerization is completed.

4. The method for preparing the temperature self-regulating hollow network yarn according to claim 1 or 3, characterized in that: The molar ratio of the n-octadecane, the methyl methacrylate and the anionic surfactant is 1:3-5:0.8-1.2, and the anionic surfactant is sodium α-olefin sulfonate.

5. The method for preparing the temperature self-regulating hollow network yarn according to claim 1, characterized in that: In the process of preparing modified polyacrylonitrile hollow fibers or modified polylactic acid hollow fibers, the silver nitrate solution is an aqueous solution of silver nitrate with a concentration of 0.1wt%-1.0wt%; and / or, the first organic solvent is N,N-dimethylformamide, and the second organic solvent is dimethylacetamide.

6. The method for preparing the temperature self-regulating hollow network yarn according to claim 1, characterized in that: In the modified polyacrylonitrile hollow fiber, the added amount of carbon aerogel accounts for 0.1%-0.5% by mass of the modified polyacrylonitrile hollow fiber; In the modified polylactic acid hollow fiber, the added amount of carbon aerogel is 0.1%-0.5% by mass of the modified polylactic acid hollow fiber.

7. The method for preparing the temperature self-regulating hollow network yarn according to claim 1, characterized in that: In the process of preparing modified polyacrylonitrile hollow fibers, the spinning process parameters are: output voltage of 0-50 kV, output current of 0.5-1.5 mA; injection pump microstepping distance of 0.1-0.2 μm, and spinneret diameter of 1-6 mm; In the process of preparing modified polylactic acid hollow fibers, the spinning process parameters are: output voltage of 0-50kV, output current of 0.5-1.5mA; micro-step advancement distance of the injection pump of 0.1-0.2μm, and spinneret diameter of 1-6mm.

8. A temperature-self-regulating hollow network yarn produced by the preparation method according to any one of claims 1 to 7.

9. Use of the temperature self-regulating hollow network yarn according to claim 8 in thermal clothing.

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