A zero-energy dual-module thermal management fabric and a preparation method thereof

Abstract

The application relates to the technical field of heat management, and discloses a zero-energy-consumption double-module heat management fabric and a preparation method thereof, which comprises the following steps: uniformly mixing polydimethylsiloxane, thermochromic powder and ultraviolet absorber powder to configure a spinning solution; adopting coaxial wet spinning, taking the spinning solution as a skin material and taking silicone oil as a core material, so that nascent fibers pass through a silicone oil condensing bath to obtain hollow core fibers; filling a PNIPAM pre-gel solution into the hollow core fibers under an oxygen-free atmosphere, and polymerizing at-5-0 DEG C to obtain functionalized fibers; and weaving the functionalized fibers into a fabric, which is the zero-energy-consumption double-module heat management fabric. The coaxial wet spinning makes the phase change hydrogel capable of being applied in the fabric field without contacting the outside world, prevents water loss of the hydrogel, and enhances the circulation. Also, the fabric has the ability to resist sudden changes of external environment temperature, which provides more possibilities for the wide application of the zero-energy-consumption double-module heat management fabric in multiple fields.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal management, in particular to a zero-energy dual-module thermal management fabric and a preparation method thereof. BACKGROUND

[0002] In the past decade, the demand for cooling and heating in human society has grown rapidly. About 37% of the energy consumption is used for cooling and heating of buildings throughout the year.

[0003] Therefore, it is crucial to explore advanced thermal energy management technologies for sustainable development. Among them, radiation thermal energy management stands out as a technology that can regulate heat exchange processes through infrared (IR) radiation without additional energy consumption. The sub-environmental cooling capacity of radiation cooling materials comes from their ability to emit heat through the atmospheric transparent window to the cold outer space with a temperature of only ~3K, while reflecting a large amount of solar radiation heat (i.e. with high solar emissivity). In recent years, various high-performance radiation cooling materials based on thermal emitters have been developed, mainly for building energy saving and personal thermal management. According to the spectral response characteristics of such materials in the mid-infrared band, radiation cooling materials can be mainly divided into two categories: non-selective thermal emitters and selective thermal emitters. Non-selective thermal emitters refer to radiation cooling materials that exhibit high emissivity in the entire mid-infrared band. The present application is a non-selective emitter. However, traditional radiation thermal energy management materials (RTMM) usually only have a single passive temperature management capability, and zero-energy RTMM materials also only have a single solar light selection capability, which limits their application range. Therefore, it is urgent to develop zero-energy dual-module thermal management radiation materials with a wider application range.

[0004] In recent years, the research on zero-energy dual-module thermal management that takes into account both radiation cooling and solar light modulation has mainly focused on two directions: using the thermochromic properties of certain materials to achieve effective solar light modulation, combined with radiation cooling materials or structural design to achieve better zero-energy dual-module thermal management. Another direction is to use the photochromic properties of certain materials to achieve effective solar light modulation, combined with radiation cooling materials or structural design to achieve better zero-energy dual-module thermal management. However, due to the complexity of zero-energy dual-module thermal management research, it has not been widely studied and applied, and remains a research focus. SUMMARY

[0005] In order to solve the above technical problems, the present application proposes a simple high-temperature wet spinning and multi-material combination strategy to manufacture a zero-energy-consumption double-mode thermal management fabric. Through double-axis high-temperature wet spinning, the air-core thermochromic fiber is spun, solving the problem that flexible fiber is difficult to combine with thermochromic powder, and phase-change hydrogel is filled in the fiber core, realizing the refrigeration and heat preservation double management capability comparable to ordinary cotton fabric, while also having the ability to resist external environmental temperature changes.

[0006] To achieve the above purpose, in one aspect, the present application provides a preparation method of a zero-energy-consumption double-mode thermal management fabric, comprising the following steps:

[0007] S1, uniformly mix polydimethylsiloxane (PDMS), thermochromic powder and ultraviolet absorber powder, and add a curing agent matched with the PDMS to configure a spinning solution;

[0008] Among them, the thermochromic powder has a color change temperature of 31℃, is white above the temperature and black below the temperature, a particle size of 3-9μm, a highest tolerance temperature not lower than 210℃, and is insoluble in water; the ultraviolet absorber powder has a model of UV-329, low toxicity, small powder particles, easy to spin later, and high ultraviolet absorbance; the mass ratio of polydimethylsiloxane, thermochromic powder and ultraviolet absorber powder is 100:(10-20):(0.5-1.5), which is configured to enable the continuous spinnability of the fiber, spin high-quality fibers, and also enable the fabric to have good sunlight modulation capability and a longer outdoor service life;

[0009] S2, using a coaxial wet spinning method, using the spinning solution configured in step S1 as the skin material, using vacuumized silicone oil as the core material, extruding the primary fiber with a skin-core structure through a concentric shaft needle, and then passing through a 190-210℃ silicone oil coagulation bath to obtain an air-core fiber;

[0010] S3, washing the air-core fiber obtained in step S2 to remove the silicone oil on the inner and outer surfaces, and then filling a poly N-isopropyl acrylamide (PNIPAM) pre-gel solution mixed with N,N,N,N-tetramethyl ethylenediamine (TEMED) into the air-core fiber in an oxygen-free atmosphere, sealing the two ends of the fiber after filling, and standing under low-temperature conditions of-5-0℃, until the PNIPAM pre-gel solution is polymerized into a hydrogel to obtain a double-mode functionalized fiber;

[0011] Among them, the phase change temperature of the hydrogel polymerized from the PNIPAM pre-gel solution is consistent with the color change temperature of the thermochromic powder, which is also 31℃, above the temperature, the cross-linked network of the hydrogel separates from water and absorbs heat, and below the temperature, the cross-linked network of the hydrogel combines with water and releases heat;

[0012] S4, the functionalized fibers obtained in step S3 are woven into a fabric, i.e. a zero-energy double-mode thermal management fabric.

[0013] As a further preferred technical solution of the present application, the thermal color-changing powder with model Chameleon TP-Black 31 is selected, which has a color-changing temperature of 31 DEG C, is white above the temperature and black below the temperature, has a particle size of 3-9 mu m, can be well dispersed in PDMS, and is resistant to high temperature and can reach 220 DEG C, so as to not affect high-temperature wet spinning.

[0014] Further, in order to spin high-quality fibers while also enabling good solar light modulation capacity and long outdoor service life of the fabric, in step S1, the mass ratio of polydimethylsiloxane, thermal color-changing powder and ultraviolet absorber powder is 100:20:1. The thermal color-changing powder and the ultraviolet absorber have little effect on the formation of the spun hollow core fiber after the optimal ratio is selected, and under the premise of ensuring continuous spinnability of the fiber, the obtained fiber has a uniform and smooth pipe wall without sand eyes, and facilitates subsequent infusion of the PNIPAM pre-gel solution.

[0015] In the technical solution of the present application, the difficulty of subsequent cleaning of the core silicone oil of the hollow core fiber, the bearing capacity of the fiber pipe wall under the high pressure generated when the protective atmosphere gas (such as Ar) is introduced into the fiber, the difficulty of pre-gel solution infusion, and the outer diameter of the fiber are as small as possible to achieve the density of the subsequent fabric and the thinnest wall to achieve a greater hydrogel filling amount, so that the effect of preventing sudden temperature change is more obvious. Therefore, through a large number of experiments, in step S2, the size of the concentric needle is preferably 19G+12G.

[0016] As a further preferred technical solution of the present application, in step S2, the spinning solution is infused into a No. 1 syringe, and the vacuumized silicone oil is infused into a No. 2 syringe. In the spinning process, the solution propeller parameters of the high-temperature wet spinning are optimized, the liquid amount of the No. 1 syringe is 300 mu L / m, and the liquid amount of the No. 2 syringe is 280 mu L / m, so that the wall thickness of the spun hollow core fiber is uniform while ensuring continuous spinnability of the fiber. In theory, if a larger capacity syringe is selected to carry more spinning solution, mass production can be carried out.

[0017] As a further preferred technical solution of the present application, by optimizing the temperature of the coagulation bath, according to the coagulation degree and quality of the spinning, in step S2, the silicone oil temperature of the coagulation bath is selected as 200 DEG C, and 500 cs is the best viscosity of the coagulation bath silicone oil.

[0018] As a further preferred technical solution of the present application, the optimal content of NIPAM monomer of the PNIPAM hydrogel in step S3 is explored, and the filling amount of the fabric core at high temperature and the bending difficulty of the fabric at high temperature are comprehensively considered. It is concluded that when the PNIPAM medicine ratio is fixed as 6 g of water, 20 mg of ammonium persulfate (APS), and 20 mg of N,N-methylene bisacrylamide (BIS), 0.6 g of N-isopropyl acrylamide (NIPAM) monomer is the optimal monomer content. Further, the amount of N,N,N,N-tetramethyl ethylenediamine (TEMED) added in the PNIPAM pre-gel solution is 13 μL.

[0019] As a further preferred technical solution of the present application, the oxygen-free atmosphere in step S3 uses an inert gas, and the inert gas needs to be filled into the hollow core fiber before the hollow core fiber is filled with the PNIPAM pre-gel solution to exclude oxygen. Further preferably, the inert gas is argon.

[0020] According to another aspect of the present application, the present application also provides a zero-energy consumption double-mode thermal management fabric prepared by the above method. The thermal management fabric can be applied to the thermal management of summer and winter or fire scenes as human clothes, tents or fire-fighting clothes.

[0021] Compared with the prior art, the present application can achieve the following beneficial effects:

[0022] 1) The preparation method of the present application is simple, and the fabric is easy to prepare in a large area and industrialized production.

[0023] 2) The combination of PDMS and thermochromic powder under high-temperature wet spinning of the present application enables the fabric to have zero-energy consumption high-temperature and low-temperature double-mode thermal management capability. Specifically, at high temperature in summer, the fabric has high solar reflectivity (0.3-2.5 μm), and in the medium and far infrared wave band, due to the spectral characteristics of PDMS, the fabric has high emission capability in the full wave band of 2.5-16 μm, which further reduces the temperature through radiation cooling, so that its cooling capacity is comparable to that of white cotton fabric on the market. At low temperature in winter, the fabric has high solar absorption capacity (0.3-2.5 μm), and since the outdoor temperature is not high, the effect of radiation cooling is not obvious, so that its heat preservation capacity is comparable to that of black cotton fabric on the market.

[0024] 3) The present application enables the phase change hydrogel to be applied in the field of fabric without contacting the outside world through coaxial wet spinning, preventing water loss of the hydrogel and enhancing the circulation. It also enables the fabric to resist sudden changes in external environmental temperature, providing more possibilities for the wide application of zero-energy consumption double-mode thermal management fabric in many fields.

[0025] 4) The present application solves the problem of UV sensitivity and easy discoloration failure of organic thermochromic powder by mixing a certain proportion of UV-329 ultraviolet absorber in the spinning solution, greatly extending the service life of the fabric outdoors. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 The experimental device schematic diagram for outdoor experiment of the heat management fabric sample of Example 1, Figure 1 a and Figure 1 b are the experimental device schematic diagrams in Tianjin summer and winter respectively, the dotted line in the figure is the position of sealing the upper part of the foam box with LDPE film, the heating sheet is constant at 37℃, simulating human body temperature, the copper foil makes the transverse temperature diffusion uniform, and the medical silicone is used to simulate the skin;

[0028] Figure 2 The experimental data and experimental conditions under sealed conditions in the outdoor experiment on September 17, 2024, wherein (a) the real-time temperature curves of the heat management fabric of the zero-energy-consumption double module (red line) and the PDMS water-containing gel fabric (orange line) used as a control experiment, black cotton fabric (blue line) and white cotton fabric (green line) when sealed with polyethylene PE film; (b) the corresponding environmental conditions, including solar radiation, humidity and wind speed;

[0029] Figure 3 The experimental data and experimental conditions under sealed conditions in the outdoor experiment on December 3, 2024, wherein (a) the real-time temperature curves of the heat management fabric of the zero-energy-consumption double module (red line) and the black cotton fabric (blue line) and white cotton fabric (green line) used as a control experiment when sealed with polyethylene PE film; (b) the corresponding environmental conditions, including solar radiation, humidity and wind speed;

[0030] Figure 4 The spectrum of the heat management fabric sample of Example 1.

[0031] The purpose of the present application, functional characteristics and advantages will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0033] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. The test reagents used in the following examples are all conventional biochemical reagents unless otherwise specified; the experimental methods used are all conventional methods unless otherwise specified.

[0034] Example 1

[0035] 1) Mix Dow Corning SYLGARD 184 silicone rubber polydimethylsiloxane (PDMS), Chameleon TP-Black 31 (thermochromic powder, manufacturer: Shenzhen Huancai Color Changing Technology) and UV-329 (ultraviolet absorber powder) at a mass ratio of 100:20:1, high-power probe ultrasonic for 20 min, add Dow Corning SYLGARD 184 silicone rubber curing agent at a mass ratio of 1:5 with PDMS, mix uniformly, high-power oscillation for 20 min, then repeatedly vacuumize the mixture for three times, each time not less than 5 min, to obtain a spinning solution.

[0036] 2) Fill the spinning solution into a 12 ml syringe 1 and silicone oil into a 12 ml syringe 2; adjust the liquid volume of syringe 1 pusher to 300 μL / m and that of syringe 2 pusher to 280 μL / m, and perform high-temperature coaxial wet spinning, wherein the spinning solution is used as the skin material and the silicone oil is used as the core material; the spinning needle (concentric shaft needle) is designed as an integrated, inner and outer flush, side needle seat, with parameters of 19+12G, and the two syringes are connected to the spinning needle through a commercial high-temperature resistant silicone tube (inner diameter 2 mm, outer diameter 3 mm) to form double-tube injection; the solidification bath for receiving the nascent fiber below the needle is silicone oil with a temperature of 200 ℃ and a viscosity of 500 cs, and the fiber passing through the solidification bath is collected by an automatic rotating shaft at the end; the hollow core fiber obtained has a length of 12-16 m, an outer diameter of about 1.3 mm and an inner diameter of about 1 mm.

[0037] 3) Dip the obtained hollow core fiber into isopropyl alcohol, seal, and store in a 60 ℃ oven for 8 h to make the fiber solidify stably, and then repeatedly clean the silicone oil on the core and the outer surface of the hollow core fiber until complete cleaning, and dry for standby use.

[0038] 4) Prepare a PNIPAM pre-gel solution: take 6 g of H2O and 0.6 g of NIPAM monomer, stir at 60 ℃ for half an hour until the monomer is completely dissolved, add 20 mg of APS and 20 mg of BIS, dissolve uniformly, vacuumize to remove bubbles, and prepare a PNIPAM pre-gel solution.

[0039] 5) After drying, the hollow fiber is placed in an Ar environment, and Ar is passed through the core for 20 min; 13 μΐ of TEMED is added to the PNIPAM pre-hydrogel and mixed evenly, and Ar is injected into the solution to ensure that no oxygen is present in the solution. Then, the mixture is injected into the core of the hollow fiber using a syringe. After filling, the fiber is sealed at both ends, and the fiber is stored at 0 °C for 1 day under Ar to successfully crosslink the hydrogel in the core of the fiber, thereby obtaining a functionalized fiber.

[0040] 6) The functionalized fiber is woven into a fabric for subsequent testing.

[0041] The fabric sample of Example 1 above was subjected to the following performance tests:

[0042] As shown in Figure 1 , an outdoor test was carried out to verify the cooling and heating performance of the zero-energy dual-mode thermal management fabric. In the experiment, a sample with a size of 4 cm x 4 cm was used, and the thermal management ability of the sample was tested under two conditions of high temperature in summer and low temperature in winter. The LDPE film used in the experimental device serves to reduce the interference of heat radiation and air convection of the surrounding building on the test results of the sample. During the test, the sample was placed in a foam box (porous foam material) with aluminum foil on the inner wall to maximize the insulation against thermal convection and thermal radiation from the surrounding complex environment. In order to simulate the real test conditions of the fabric when it is used as clothing, we placed a thin heating sheet at the bottom, and adjusted the low-pressure source parameters to keep the temperature at 37°C, which is close to the human body temperature in the room. The top of the heating sheet is tightly attached to the copper foil, and the top of the copper foil is attached to the simulated skin with a small air slot. The thermocouple is inserted into the small air slot and filled with thermal conductive silicone grease to ensure good thermal conductivity and a real skin surface temperature under the fabric cover. The copper foil, as an excellent conductor, has rapid and uniform temperature diffusion, which can reflect the overall temperature of the sample and make the temperature tested by the thermocouple more accurate. At the same time, the comprehensive weather station recorded the weather data including humidity, solar radiation intensity and wind speed Figure 2 b and Figure 3 b).

[0043] As shown in Figure 2 a, under high solar radiation intensity and without thermal convection, the cooling capacity of the zero-energy dual-mode thermal management fabric is comparable to that of a commercial white cotton fabric, and is about 5 K lower than that of a commercial black cotton fabric. At the beginning of the test, the temperature changes slowly due to the presence of the phase change hydrogel, which has the ability to resist sudden changes in the temperature outside the fabric, and the greater the temperature difference between the inside and outside, the more obvious the function. Figure 2As shown in Fig. a, the PDMS hydrogel fabric without UV-329 began to fail at about 165 min of outdoor testing, the refrigeration capacity decreased, the temperature increased compared with the thermal management fabric of the zero-energy dual-mode module, and it can be seen that UV-329 has obvious effect of prolonging the service life of the fabric in outdoor use.

[0044] As shown in Fig. a, the PDMS hydrogel fabric without UV-329 began to fail at about 165 min of outdoor testing, the refrigeration capacity decreased, the temperature increased compared with the thermal management fabric of the zero-energy dual-mode module, and it can be seen that UV-329 has obvious effect of prolonging the service life of the fabric in outdoor use. Figure 3 As shown in Fig. a, the PDMS hydrogel fabric without UV-329 began to fail at about 165 min of outdoor testing, the refrigeration capacity decreased, the temperature increased compared with the thermal management fabric of the zero-energy dual-mode module, and it can be seen that UV-329 has obvious effect of prolonging the service life of the fabric in outdoor use. Figure 4 As shown in Fig. a, the PDMS hydrogel fabric without UV-329 began to fail at about 165 min of outdoor testing, the refrigeration capacity decreased, the temperature increased compared with the thermal management fabric of the zero-energy dual-mode module, and it can be seen that UV-329 has obvious effect of prolonging the service life of the fabric in outdoor use.

[0045] The above test results effectively prove that the zero-energy dual-mode thermal management fabric provides a zero-energy thermal management strategy. Therefore, the zero-energy dual-mode thermal management fabric of the present application can automatically switch the refrigeration / heat preservation mode according to the environment, has great energy-saving potential, can be used as a normal wearable fabric or tent, automatically adapts to the environmental temperature to make the internal temperature comfortable, or as a fire-fighting clothing used in a fire scene. The fabric automatically switches the refrigeration and heating modes according to the change of the external temperature, and the refrigeration capacity is equivalent to that of the commercial white cotton fabric, and the heating capacity is equivalent to that of the commercial black cotton fabric. The zero-energy dual-mode multifunctional thermal management fabric can prevent the adverse effects of sudden changes in external temperature on the human body, and has wide application prospects.

[0046] In order to further prove the beneficial technical effects of the present application, the following experiments were conducted.

[0047] 1. Based on the scheme of Example 1, only changing "PDMS: Chameleon TP-Black 31 mass ratio, without using UV-329" as a control experiment, Table 1 is the influence of PDMS: Chameleon TP-Black 31 mass ratio on the modulation of visible light reflectivity at high and low temperatures, and the data results are measured by ultraviolet visible near infrared spectrophotometer.

[0048] Based on the above control experiment, it is concluded that the visible light modulation ability is best when the mass ratio of PDMS:Chameleon TP-Black 31 is 5:1; and when the ratio is greater than 5:1, the spinning solution is too viscous and cannot be spun continuously.

[0049] Table 1 Effect of mass ratio of PDMS:Chameleon TP-Black 31 on visible light reflectivity modulation at high and low temperatures

[0050] PDMS: Chameleon TP-Black 31 mass ratio Modulation of visible light reflectance at high and low temperature 5:1 47.6％ 10:1 44.8％ 20:1 42.4％

[0051] 2. Based on the scheme of Example 1, only the type of "ultraviolet absorber / reflectant" is changed to make a control experiment, and Table 2 shows the effect of different ultraviolet absorbers / reflectants on the feasibility of wet spinning and the anti-failure ability of Chameleon TP-Black 31, i.e., ultraviolet absorption / reflection ability test.

[0052] Based on the above control experiment, it is concluded that the spinning solution system of the application using UV-329 is suitable for continuous spinning and has strong ultraviolet absorption ability.

[0053] Table 2 Selection of ultraviolet absorber / reflectant

[0054] UV absorber / reflectant Whether it can continue to spin Xenon lamp irradiation fabric (1500W / m2 2h) Blank control √ Fading Benzophenone X (more than 48.5 ℃ dissolved in PDMS, low temperature precipitation) / Tartrazine √ Fading UV-1 X (evaporated in the solidification range of 200 ℃) / UV-234 √ Fading UV-329 √ No fading

[0055] In Table 2, "√" means yes, and "×" means no.

[0056] 3. Based on the scheme of Example 1, only the content of "UV-329" is changed to make a control experiment, and Table 3 shows the effect of the content of UV-329 on spinning and fabric.

[0057] Based on the above control experiment, it is concluded that the mass ratio of PDMS:UV-329 100:1 is the best spinning ratio, which can meet the ultraviolet absorption ability of the fabric and will not affect the continuous spinning.

[0058] Table 3 Effect of content of UV-329 on spinning and fabric

[0059]

[0060] 4. Based on the scheme of Example 1, only the "coagulation temperature range" is changed to make a control experiment, and Table 4 shows the effect of the coagulation temperature range on the spinning process.

[0061] Based on the above control experiment, the temperature should be as low as possible under the premise of ensuring good fiber formation to save operation time and cost, and it is concluded that 200°C is the best coagulation temperature range for this spinning process.

[0062] Table 4 Effect of coagulation temperature range on spinning

[0063] Solidification range temperature (silicone oil) 160℃ 180℃ 200℃ Spinning effect Dispersed in the solidification range, difficult to solidify Slow solidification leads to uneven fiber morphology Fiber solidification molding is good

[0064] 5. Based on the scheme of Example 1, a control experiment was conducted by changing only the "wet spinning needle type". Table 5 shows the effect of different wet spinning needle types on the size of the spun fibers.

[0065] Based on the above comparative experiments, fiber selection should consider the ease of cleaning the silicone oil in the core, the fiber wall's ability to withstand the high pressure generated when Ar is passed through the fiber, the ease of injecting the pre-gelling solution, and the fiber's outer diameter should be as small as possible to achieve the density of the subsequent fabric, and the fiber wall should be as thin as possible to achieve a larger hydrogel filling volume, making the effect of preventing sudden temperature changes more obvious. Taking all factors into account, a 19G+12G wet spinning needle can meet the optimal process requirements.

[0066] Table 5. Effect of different wet spinning needle types on the size of spun fibers.

[0067] Needle type 19G+14G 19G+12G 19G+10G 16G+12G 14G+10G 12G+8G Spun fiber inner diameter (mm) ～0.8 ～1.0 ～1.1 ～1.2 ～1.4 ～1.5 Spun fiber outer diameter (mm) ～1.0 ～1.3 ～1.5 ～1.5 ～1.6 ～1.8

[0068] 6. Based on the scheme of Example 1, a control experiment was conducted by only changing the "NIPAM monomer content of PNIPAM". Table 6 shows the effect of different NIPAM contents on PNIPAM.

[0069] Based on the above comparative experiments, since the cross-linked network formed by PNIPAM polymerization at high temperatures will separate from water molecules, excessively high NIPAM content will lead to an overly stiff cross-linked network, making the woven fabric difficult to bend. Furthermore, at high temperatures, the volume of PNIPAM will shrink; this shrinkage should be minimized to ensure sufficient filling in the fabric core. After comprehensive comparison, based on the gel material system of Example 1, it was concluded that PNIPAM polymerized with 0.6g of NIPAM monomer better meets the process requirements.

[0070] Table 6. Effect of NIPAM monomer content on polymerized NIPAM

[0071]

[0072] In Table 6, "√" indicates that the requirements are met, and "×" indicates that the requirements are not met.

[0073] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.

Claims

1. A method for preparing a zero-energy dual-module thermal management fabric, characterized in that, Includes the following steps: S1. Mix polydimethylsiloxane, thermochromic powder and ultraviolet absorber powder evenly, add curing agent compatible with PDMS, prepare a spinning solution and vacuum process it. The thermochromic powder has a color-changing temperature of 31℃, turning white above this temperature and black below it. Its particle size is 3-9μm, and its maximum tolerance temperature is not lower than 210℃. It is also insoluble in water. The type of ultraviolet absorber powder is UV-329. The mass ratio of polydimethylsiloxane, thermochromic powder, and ultraviolet absorber powder is 100:(10-20):(0.5-1.5). S2. Using the coaxial wet spinning method, the spinning solution prepared in step S1 is used as the sheath material, and the vacuum-sealed silicone oil is used as the core material. The nascent fibers with a sheath-core structure are extruded through a coaxial needle and then passed through a silicone oil coagulation bath at 190-210℃ to obtain hollow fibers. S3. The hollow fiber obtained in step S2 is washed to remove the silicone oil on the inner and outer surfaces. Then, under an oxygen-free atmosphere, a poly(N-isopropylacrylamide) pregel solution mixed with N,N,N,N-tetramethylethylenediamine is injected into the hollow fiber. After filling, the two ends of the fiber are sealed and left to stand at -5 to 0°C until the poly(N-isopropylacrylamide) pregel solution polymerizes into a hydrogel to obtain a dual-module functional fiber. S4. The functional fibers obtained in step S3 are woven into a fabric, which is the thermal management fabric of the zero-energy dual-module.

2. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, In step S1, the mass ratio of polydimethylsiloxane, thermochromic powder, and ultraviolet absorber powder is 100:20:

1.

3. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, In step S2, the type of the concentric needle is 19G+12G.

4. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, In step S2, the spinning solution is poured into syringe No. 1, and the vacuum-sealed silicone oil is poured into syringe No.

2. During the spinning process, the liquid volume of syringe No. 1 is 300 μL / m, and the liquid volume of syringe No. 2 is 280 μL / m.

5. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, In step S2, the silicone oil in the coagulation bath has a temperature of 200°C and a viscosity of 500 cs.

6. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, In step S3, the poly(N-isopropylacrylamide) pregel solution is prepared by mixing the following components in the following proportions: 6g water, 20mg ammonium persulfate, 20mg N,N-methylenebisacrylamide, and 0.6g N-isopropylacrylamide monomer.

7. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 6, characterized in that, In step S3, the amount of N,N,N,N-tetramethylethylenediamine added to the poly(N-isopropylacrylamide) pregel solution is 13 μL.

8. The method for preparing the thermal management fabric of the zero-energy dual-module according to claim 1, characterized in that, The oxygen-free atmosphere in step S3 uses an inert gas, and the hollow fiber needs to be filled with this inert gas before the poly-N-isopropylacrylamide pregel solution is injected into it.

9. A zero-energy dual-module thermal management fabric, characterized in that, It is prepared by the method described in any one of claims 1-8.

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