Intelligent temperature control type warm-keeping composite fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and particularly discloses an intelligent temperature control type warm-keeping composite fabric and a preparation method thereof. The intelligent temperature control type warm-keeping composite fabric comprises a skin-friendly layer, an intelligent temperature control layer, an infrared shielding layer and a wear-resistant protective layer which are connected in sequence, the intelligent temperature control layer comprises a modified silicon dioxide aerogel layer and a modified nanocellulose aerogel layer which are connected in sequence, the modified silicon dioxide aerogel layer is in contact with the infrared shielding layer, and the modified nanocellulose aerogel layer is in contact with the wear-resistant protective layer. The modified nano cellulose aerogel layer is in contact with the skin-friendly layer; in addition, the preparation method provided by the invention has the advantage that the fabric can intelligently regulate and control the thermal insulation effect.

Description

Technical Field

[0001] This application relates to the field of fabric technology, and more specifically, to an intelligent temperature-controlled thermal insulation composite fabric and its preparation method. Background Technology

[0002] In the field of textile fabric technology, the development of thermal insulation fabrics has always attracted much attention. With the improvement of people's living standards and the increasing demands for wearing comfort, thermal insulation fabrics are being used more and more widely in winter clothing, outdoor equipment, and other fields. High-quality thermal insulation fabrics not only provide people with the necessary warmth in cold environments, but also improve people's ease of movement and comfort to a certain extent, thus having a positive impact on people's daily lives and outdoor activities.

[0003] In cold winters or low-temperature outdoor environments, traditional thermal fabrics rely primarily on increasing fabric thickness and filling with down, cotton, and other insulating materials to achieve warmth. Some thermal fabrics also incorporate functional materials to enhance specific properties. However, these methods have significant limitations. On the one hand, in cold environments, if the insulating material's heat retention is insufficient, heat is easily lost, failing to provide continuous and stable warmth to the body. On the other hand, when the ambient temperature rises or the body generates more heat due to activity, traditional thermal fabrics have poor heat dissipation properties, making it difficult for heat to escape, leading to discomfort such as stuffiness and sweating. Furthermore, some existing thermal fabrics have limited functionality and fail to automatically adjust heat transfer based on changes in ambient and body temperature. Additionally, during the manufacturing process, the bonding between materials in some fabrics is not tight enough, leading to delamination and shedding, affecting the fabric's lifespan and performance. Summary of the Invention

[0004] In order to achieve intelligent temperature control of the insulation effect of the fabric, this application provides an intelligent temperature-controlled thermal insulation composite fabric and its preparation method.

[0005] In the first aspect, this application provides an intelligent temperature-controlled thermal insulation composite fabric, which adopts the following technical solution: A smart temperature-controlled thermal insulation composite fabric includes a skin-friendly layer, a smart temperature-controlled layer, an infrared shielding layer, and a wear-resistant protective layer connected in sequence. The smart temperature-controlled layer includes a modified silica aerogel layer and a modified nanocellulose aerogel layer connected in sequence. The modified silica aerogel layer is in contact with the infrared shielding layer, and the modified nanocellulose aerogel layer is in contact with the skin-friendly layer.

[0006] By adopting the above technical solution, the skin-friendly layer directly contacts the skin and is made of a blend of pure cotton and bamboo fibers, which not only ensures a comfortable wearing experience, but also forms an efficient moisture management system through the synergistic effect of the two fibers. The intelligent temperature control layer is the core functional layer. The nanocellulose aerogel layer close to the skin has rapid thermal response characteristics and can absorb or release heat in time. The outer silica aerogel layer provides a stable heat insulation barrier. The two work together to achieve dynamic temperature regulation. The infrared shielding layer can effectively reflect the far-infrared rays emitted by the human body and minimize heat radiation loss. The wear-resistant protective layer adopts a high-strength microfiber weaving structure, which significantly improves the durability of the fabric while ensuring softness.

[0007] Preferably, the skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of (2.5-3):(0.8-1.2).

[0008] By adopting the above technical solutions, pure cotton fibers have good hydrophilicity and porous structure, enabling rapid moisture absorption and diffusion; bamboo fibers have a unique cross-sectional structure and natural antibacterial components, which not only enhance the ability to guide and expel moisture, but also create a microenvironment unfavorable to bacterial growth. The organic combination of the two allows the skin-friendly layer to maintain the comfort of cotton while possessing better moisture-wicking function and a lasting fresh experience.

[0009] Preferably, the modified nanocellulose aerogel layer comprises a plurality of modified nanocellulose aerogel sheets, and the preparation method of the modified nanocellulose aerogel sheets includes the following steps: dispersing nanocellulose in water to obtain a nanocellulose solution, then adding graphene oxide and phase change microcapsules, ultrasonically dispersing for 30 min to obtain a composite solution, injecting the composite solution into a sheet mold, vertically placing the sheet mold on a copper block submerged in liquid nitrogen and rapidly freezing for 20 min, and then freeze-drying for 48 h to obtain the modified nanocellulose aerogel sheets.

[0010] By employing the aforementioned technical solution and controlling the growth direction of ice crystals, an ordered layered pore structure is formed within the material. These microscopic channels not only effectively block lateral heat conduction but also provide a dedicated pathway for the rapid passage of water vapor. The addition of graphene oxide constructs a highly efficient heat conduction pathway within the cellulose network, enabling rapid heat transfer to the dispersed phase change microcapsules. This allows the modified nanocellulose aerogel layer to respond quickly to changes in body temperature, thereby helping to maintain the internal temperature of the fabric.

[0011] Preferably, the mass ratio of the nanocellulose, phase change microcapsules, and graphene oxide is (0.98-1.11):(0.45-0.51):(0.32-0.35).

[0012] By adopting the above technical solution, the three-dimensional network structure formed by nanocellulose has good mechanical strength and porosity, which can provide a stable support environment for phase change microcapsules. The distribution density of phase change microcapsules not only ensures sufficient heat storage capacity, but also avoids affecting the structural uniformity of the material due to excessive aggregation. Controlling the amount of graphene oxide can enable the modified nanocellulose aerogel layer to respond quickly to changes in body temperature, without affecting the thermal insulation performance of the modified nanocellulose aerogel layer.

[0013] Preferably, the method for preparing the modified silica aerogel layer includes the following steps: mixing tetraethyl orthosilicate, methyltriethoxysilane and ethanol solution, adding hydrochloric acid to adjust the pH, stirring evenly and letting stand for 1 hour, adding phase change microcapsules and ammonia water, adjusting the pH to 7-8, continuing to stir for 60 minutes, ultrasonically forming a wet gel, and after aging, displacement and supercritical drying, obtaining the modified silica aerogel layer.

[0014] By adopting the above technical solution, phase change microcapsules are uniformly fixed in the three-dimensional network structure during the formation of silica gel, which can effectively reduce the leakage of phase change materials and ensure uniform heat absorption and release.

[0015] Preferably, the amount of phase change microcapsules added is 4.12-5.32 wt% of tetraethyl orthosilicate.

[0016] By adopting the above technical solution, the phase change material is ensured to have the best distribution state in the aerogel, which can form a continuous thermal regulation network without blocking the nanopores of the aerogel and affecting its thermal insulation performance. This allows the fabric to provide a stable thermal buffer effect when the temperature fluctuates, avoiding insufficient temperature regulation due to insufficient phase change material or material embrittlement due to excessive addition.

[0017] Preferably, the preparation method of the intelligent temperature control layer includes the following steps: mixing tetraethyl orthosilicate with an ethanol solution, adding ammonia to adjust the pH to 8, continuing to stir to obtain a silica sol, coating the silica sol onto one side of a silica aerogel layer, splicing modified nanocellulose aerogel sheets onto the silica sol layer, and freeze-drying to obtain the intelligent temperature control layer.

[0018] By adopting the above technical solution, the silica sol forms a strong chemical bond with the two layers of aerogel during the curing process, which not only tightly binds the two layers of aerogel, but also reduces the impact of the adhesive structure on the thermal insulation performance of the intelligent temperature control layer.

[0019] Secondly, this application provides a method for preparing an intelligent temperature-controlled thermal insulation composite fabric, employing the following technical solution: A method for preparing an intelligent temperature-controlled thermal insulation composite fabric includes the following steps: sequentially stacking a skin-friendly layer, an intelligent temperature-controlled layer, an infrared shielding layer, and a wear-resistant protective layer and then hot-pressing them together.

[0020] By adopting the above technical solutions, the fabric achieves excellent softness and drape while maintaining its superior functionality, ensuring a comfortable wearing experience. After multiple washes, the functional layers of the fabric treated with this process can still maintain a stable bond, demonstrating excellent durability.

[0021] In summary, this application has the following beneficial effects: 1. Since the skin-friendly layer of this application comes into direct contact with the skin, it is made of a blend of pure cotton fiber and bamboo fiber, which not only ensures a comfortable wearing experience, but also forms an efficient moisture management system through the synergistic effect of the two fibers. The intelligent temperature control layer is the core functional layer. The nanocellulose aerogel layer close to the skin has rapid thermal response characteristics and can absorb or release heat in time. The outer silica aerogel layer provides a stable heat insulation barrier. The two work together to achieve dynamic temperature regulation. The infrared shielding layer can effectively reflect the far-infrared rays emitted by the human body and minimize heat radiation loss. The wear-resistant protective layer adopts a high-strength microfiber weaving structure, which significantly improves the durability of the fabric while ensuring softness.

[0022] 2. In this application, by controlling the growth direction of ice crystals, an ordered layered pore structure is formed inside the material. These micro-channels not only effectively block the lateral conduction of heat but also provide a dedicated path for the rapid passage of water vapor. The addition of graphene oxide constructs a highly efficient heat conduction pathway in the cellulose network, enabling heat to be rapidly transferred to the phase change microcapsules dispersed throughout, allowing the modified nanocellulose aerogel layer to respond quickly to changes in body temperature, thereby helping to maintain the internal temperature of the fabric.

[0023] 3. The method of this application forms a three-dimensional network structure of nanocellulose with good mechanical strength and porosity, which can provide a stable support environment for phase change microcapsules. The distribution density of phase change microcapsules ensures sufficient heat storage capacity and avoids affecting the structural uniformity of the material due to excessive aggregation. Controlling the amount of graphene oxide can enable the modified nanocellulose aerogel layer to respond rapidly to changes in body temperature without affecting the thermal insulation performance of the modified nanocellulose aerogel layer. Detailed Implementation

[0024] The present application will be further described in detail below with reference to the embodiments. Preparation example of phase change microcapsules

[0025] Preparation Example 1 0.3 g Span 80, 0.6 g Tween 80, and 20 g paraffin were added to 100 mL of water and emulsified for 30 min to obtain an oil phase. 100 mL of calcium chloride solution was added dropwise to the oil phase and emulsified for 3 h. Then, 100 mL of sodium carbonate aqueous solution was added dropwise and reacted for 6 h. After filtration, washing, and drying, phase change microcapsules were obtained. The core material of the phase change microcapsules was paraffin, and the wall material was calcium carbonate with a core-to-wall mass ratio of 1:1. The sodium carbonate aqueous solution and the calcium chloride solution had the same concentration. Preparation Examples of Modified Nanocellulose Aerogel Sheets 2-5

[0026] Preparation Example 2 The preparation method of modified nanocellulose aerogel sheets includes the following steps: 0.5g of nanocellulose is dispersed in 50mL of water to obtain a nanocellulose solution, then graphene oxide and phase change microcapsules are added, and after ultrasonic dispersion for 30min, a composite solution is obtained. The composite solution is injected into a sheet mold, and the sheet mold is vertically placed on a copper block submerged in liquid nitrogen and rapidly frozen for 20min. After freeze-drying for 48h, a modified nanocellulose aerogel sheet is obtained. The mass ratio of nanocellulose, phase change microcapsules and graphene oxide is 0.98:0.45:0.32. The phase change microcapsules are selected from those prepared in Preparation Example 1.

[0027] Preparation Example 3 The method for preparing modified nanocellulose aerogel sheets includes the following steps: dispersing 0.5g of nanocellulose in 50mL of water to obtain a nanocellulose solution, then adding graphene oxide and phase change microcapsules, ultrasonically dispersing for 30min to obtain a composite solution, injecting the composite solution into a sheet mold, vertically placing the sheet mold on a copper block submerged in liquid nitrogen and rapidly freezing for 20min, then freeze-drying for 48h to obtain modified nanocellulose aerogel sheets. The mass ratio of nanocellulose, phase change microcapsules and graphene oxide is 1.11:0.51:0.35, and the phase change microcapsules are selected from those prepared in Preparation Example 1.

[0028] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 2 is that in Preparation Example 4, the mass ratio of nanocellulose, phase change microcapsules and graphene oxide is 0.98:0.35:0.42.

[0029] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 2 is that in Preparation Example 5, the mass ratio of nanocellulose, phase change microcapsules and graphene oxide is 0.98:0.59:0.22. Preparation Examples of Modified Silica Aerogel Layers 6-9

[0030] Preparation Example 6 The method for preparing a modified silica aerogel layer includes the following steps: 1g of tetraethyl orthosilicate, 0.2g of methyltriethoxysilane and 22mL of 90% ethanol solution are mixed, 0.3mL of 1mol / L hydrochloric acid is added to adjust the pH, the mixture is stirred evenly and allowed to stand for 1h, phase change microcapsules and 1mL of 15t% ammonia are added, the pH is adjusted to 7-8, the mixture is stirred for 60min, and then ultrasonically formed into a wet gel. After aging, displacement and supercritical drying, a modified silica aerogel layer is obtained. The amount of phase change microcapsules added is 4.12wt% of tetraethyl orthosilicate, and the phase change microcapsules are selected from those prepared in Preparation Example 1.

[0031] Preparation Example 7 The method for preparing a modified silica aerogel layer includes the following steps: 1g of tetraethyl orthosilicate, 0.2g of methyltriethoxysilane and 22mL of 90% ethanol solution are mixed, 0.3mL of 1mol / L hydrochloric acid is added to adjust the pH, the mixture is stirred evenly and allowed to stand for 1h, phase change microcapsules and 1mL of 15t% ammonia are added, the pH is adjusted to 7-8, the mixture is stirred for 60min, and then ultrasonically formed into a wet gel. After aging, displacement and supercritical drying, a modified silica aerogel layer is obtained. The amount of phase change microcapsules added is 5.32wt% of tetraethyl orthosilicate, and the phase change microcapsules are selected from those prepared in Preparation Example 1.

[0032] Preparation Example 8 The difference between Preparation Example 8 and Preparation Example 6 is that in Preparation Example 8, the amount of phase change microcapsules added is 2.23 wt% of tetraethyl orthosilicate.

[0033] Preparation Example 9 The difference between Preparation Example 9 and Preparation Example 6 is that in Preparation Example 9, the amount of phase change microcapsules added is 7.51 wt% of tetraethyl orthosilicate. Example

[0034] Example 1 A smart temperature-controlled thermal insulation composite fabric includes a skin-friendly layer, a smart temperature-controlled layer, an infrared shielding layer, and a wear-resistant protective layer connected in sequence. The skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of 2.5:0.8. The infrared shielding layer is composed of a polyester base fabric coated with nano-tin antimony oxide powder. The wear-resistant protective layer is made of nylon fiber in a plain weave. The smart temperature-controlled layer includes a modified silica aerogel layer and a modified nanocellulose aerogel layer connected in sequence. The modified silica aerogel layer is in contact with the infrared shielding layer, and the modified nanocellulose aerogel layer is in contact with the skin-friendly layer. The modified nanocellulose aerogel layer includes a plurality of modified nanocellulose aerogel sheets. The modified silica aerogel layer is selected from the modified silica aerogel layer prepared in Preparation Example 6, and the modified nanocellulose aerogel sheets are selected from the modified nanocellulose aerogel sheets prepared in Preparation Example 2.

[0035] The preparation method of the intelligent temperature control layer includes the following steps: 15g of tetraethyl orthosilicate is mixed with 100mL of 90% ethanol solution, ammonia is added to adjust the pH to 8, and stirring is continued to obtain silica sol. The silica sol is coated on one side of a silica aerogel layer, and modified nanocellulose aerogel sheets are spliced ​​and covered on the silica sol layer. The mixture is then freeze-dried to obtain the intelligent temperature control layer.

[0036] The preparation method of the above-mentioned intelligent temperature-controlled thermal insulation composite fabric includes the following steps: sequentially stacking the skin-friendly layer, intelligent temperature-controlled layer, infrared shielding layer and wear-resistant protective layer and then hot-pressing them together.

[0037] Example 2

[0038] A smart temperature-controlled thermal insulation composite fabric includes a skin-friendly layer, a smart temperature-controlled layer, an infrared shielding layer, and a wear-resistant protective layer connected in sequence. The skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of 3:1.2. The infrared shielding layer is composed of a polyester base fabric coated with nano-tin antimony oxide powder. The wear-resistant protective layer is made of nylon fiber in a plain weave. The smart temperature-controlled layer includes a modified silica aerogel layer and a modified nanocellulose aerogel layer connected in sequence. The modified silica aerogel layer is in contact with the infrared shielding layer, and the modified nanocellulose aerogel layer is in contact with the skin-friendly layer. The modified nanocellulose aerogel layer includes a plurality of modified nanocellulose aerogel sheets. The modified silica aerogel layer is selected from the modified silica aerogel layer prepared in Preparation Example 7, and the modified nanocellulose aerogel sheets are selected from the modified nanocellulose aerogel sheets prepared in Preparation Example 3.

[0039] The preparation method of the intelligent temperature control layer includes the following steps: 15g of tetraethyl orthosilicate is mixed with 100mL of 90% ethanol solution, ammonia is added to adjust the pH to 8, and stirring is continued to obtain silica sol. The silica sol is coated on one side of a silica aerogel layer, and modified nanocellulose aerogel sheets are spliced ​​and covered on the silica sol layer. The mixture is then freeze-dried to obtain the intelligent temperature control layer.

[0040] The preparation method of the above-mentioned intelligent temperature-controlled thermal insulation composite fabric includes the following steps: sequentially stacking the skin-friendly layer, intelligent temperature-controlled layer, infrared shielding layer and wear-resistant protective layer and then hot-pressing them together.

[0041] Example 3

[0042] The difference between Example 3 and Example 1 is that in Example 3, the modified silica aerogel layer is the modified silica aerogel layer prepared in Preparation Example 8.

[0043] Example 4

[0044] The difference between Example 4 and Example 1 is that in Example 4, the modified silica aerogel layer is the modified silica aerogel layer prepared in Preparation Example 9.

[0045] Example 5

[0046] The difference between Example 5 and Example 1 is that in Example 5, the modified nanocellulose aerogel sheet is the modified nanocellulose aerogel prepared in Preparation Example 4.

[0047] Example 6

[0048] The difference between Example 6 and Example 1 is that in Example 6, the modified nanocellulose aerogel sheet is the modified nanocellulose aerogel obtained in Preparation Example 5.

[0049] Example 7

[0050] The difference between Example 7 and Example 1 is that in Example 7, the skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of 2.5:0.3.

[0051] Example 8

[0052] The difference between Example 8 and Example 1 is that in Example 8, the skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of 2.5:1.8. Comparative Example

[0053] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain a smart temperature control layer.

[0054] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, an equal amount of silica aerogel layer is used instead of the smart temperature control layer.

[0055] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that in Comparative Example 3, an equal amount of modified nanocellulose aerogel layer is used instead of the smart temperature control layer. Performance testing

[0056] Intelligent temperature-controlled thermal insulation composite fabrics were prepared according to Examples 1-8 and Comparative Examples 1-3. The thermal resistance value at 20℃ and 65%RH, the duration of temperature regulation during the temperature change process from 25℃ to 35℃, and the interlayer peel strength after 20 washes were tested and the results are recorded in Table 1.

[0057] Table 1 Performance Tests of Intelligent Temperature-Controlled Thermal Insulation Composite Fabrics project Thermal resistance / clo Duration / min Peel strength (N / cm) Example 1 0.42 158 8.5 Example 2 0.45 165 8.8 Example 3 0.38 142 8.2 Example 4 0.35 135 7.9 Example 5 0.39 145 8.1 Example 6 0.37 138 8.0 Example 7 0.41 152 8.3 Example 8 0.43 156 8.4 Comparative Example 1 0.28 - 6.8 Comparative Example 2 0.32 - 7.2 Comparative Example 3 0.35 125 7.5 As can be seen from Table 1, Examples 1-2, and Comparative Examples 1-3, the fabrics prepared in Examples 1-2 have better thermal insulation and heat insulation properties, as well as good durability. The skin-friendly layer is a blend of pure cotton fiber and bamboo fiber, which is soft to the touch and has good skin-friendliness. The intelligent temperature control layer has a two-layer structure. The side closest to the skin-friendly layer is a modified nanocellulose aerogel layer. The modified nanocellulose aerogel layer contains graphene oxide with good thermal conductivity, which can quickly respond to changes in body temperature. Thus, the phase change microcapsules in the modified nanocellulose aerogel layer absorb or release heat in a timely manner according to changes in body temperature, thereby effectively maintaining the temperature stability of the inner side of the fabric. The silica aerogel layer on the outer side can provide a stable heat insulation barrier, thereby reducing the influence of the external environment on the internal temperature of the fabric. The infrared shielding layer can reduce heat radiation loss and further improve the thermal insulation performance of the fabric. The wear-resistant layer can effectively improve the durability of the fabric.

[0058] Compared with Examples 1-2, Comparative Examples 1-3 lacked an intelligent temperature control layer, Comparative Example 2 used only a silica aerogel layer, and Comparative Example 3 used only a modified nanocellulose aerogel layer. This demonstrates that the intelligent temperature-regulating layer plays a crucial role in the fabric's thermal insulation and temperature regulation performance. Furthermore, the combined use of the modified nanocellulose aerogel layer and the silica aerogel layer has a synergistic effect, effectively improving the temperature control performance of the intelligent temperature-regulating layer. Compared with Examples 1-2, Examples 3-4 showed a decrease in both heat insulation effect and temperature control performance. Examples 3-4 changed the amount of phase change microcapsules added, indicating that the amount of phase change microcapsules added affects the temperature control performance of the fabric. If the amount of phase change microcapsules added is too small, the overall heat absorption and release capacity will decrease, and temperature control will not be effective. If the amount of phase change microcapsules added is too large, it will easily destroy the porous structure of the silica aerogel layer, making its structure uneven, thereby reducing the heat insulation performance.

[0059] Compared with Examples 1-2, Examples 5-6 showed a decrease in both heat insulation effect and temperature control performance. Examples 5-6 changed the mass ratio of nanocellulose, phase change microcapsules, and graphene oxide. Example 5 used a low ratio of phase change microcapsules and high graphene oxide, which easily led to a decrease in heat storage capacity due to insufficient phase change microcapsules. At the same time, the excessive graphene oxide formed an overly dense heat-conducting network, accelerating heat loss. Example 6 used a high ratio of phase change microcapsules and low graphene oxide. The insufficient graphene oxide prevented heat from being quickly transferred to the phase change microcapsules, reducing temperature control efficiency. At the same time, the excessive phase change microcapsules affected the porous structure of the aerogel.

[0060] Compared with Examples 1-2, Examples 7-8 showed a decrease in both heat insulation and temperature control performance, but the impact was relatively small. This indicates that the mass ratio of pure cotton fiber to bamboo fiber has a small impact on the temperature control performance of the fabric. However, the fabrics obtained in Examples 7-8 had a decrease in softness and skin-friendly properties, resulting in poor wearing comfort.

[0061] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A smart temperature-controlled thermal insulation composite fabric, characterized in that: It includes a skin-friendly layer, an intelligent temperature control layer, an infrared shielding layer, and a wear-resistant protective layer connected in sequence. The intelligent temperature control layer includes a modified silica aerogel layer and a modified nanocellulose aerogel layer connected in sequence. The modified silica aerogel layer is in contact with the infrared shielding layer, and the modified nanocellulose aerogel layer is in contact with the skin-friendly layer.

2. The intelligent temperature-controlled thermal insulation composite fabric according to claim 1, characterized in that: The skin-friendly layer is made of a blend of pure cotton fiber and bamboo fiber in a mass ratio of (2.5-3):(0.8-1.2).

3. The intelligent temperature-controlled thermal insulation composite fabric according to claim 1, characterized in that: The modified nanocellulose aerogel layer comprises several modified nanocellulose aerogel sheets. The preparation method of the modified nanocellulose aerogel sheets includes the following steps: dispersing nanocellulose in water to obtain a nanocellulose solution, then adding graphene oxide and phase change microcapsules, ultrasonically dispersing for 30 min to obtain a composite solution, injecting the composite solution into a sheet mold, vertically placing the sheet mold on a copper block submerged in liquid nitrogen and rapidly freezing for 20 min, and then freeze-drying for 48 h to obtain the modified nanocellulose aerogel sheets.

4. The intelligent temperature-controlled thermal insulation composite fabric according to claim 3, characterized in that: The mass ratio of the nanocellulose, phase change microcapsules, and graphene oxide is (0.98-1.11):(0.45-0.51):(0.32-0.35).

5. The intelligent temperature-controlled thermal insulation composite fabric according to claim 1, characterized in that: The method for preparing the modified silica aerogel layer includes the following steps: mixing tetraethyl orthosilicate, methyltriethoxysilane and ethanol solution, adding hydrochloric acid to adjust the pH, stirring evenly and letting stand for 1 hour, adding phase change microcapsules and ammonia water, adjusting the pH to 7-8, continuing to stir for 60 minutes, ultrasonically forming a wet gel, and after aging, replacement and supercritical drying, obtaining the modified silica aerogel layer.

6. The intelligent temperature-controlled thermal insulation composite fabric according to claim 5, characterized in that: The amount of phase change microcapsules added is 4.12-5.32 wt% of tetraethyl orthosilicate.

7. The intelligent temperature-controlled thermal insulation composite fabric according to claim 1, characterized in that: The preparation method of the intelligent temperature control layer includes the following steps: mixing tetraethyl orthosilicate with an ethanol solution, adding ammonia to adjust the pH to 8, continuing to stir to obtain a silica sol, coating the silica sol onto one side of a silica aerogel layer, splicing modified nanocellulose aerogel sheets onto the silica sol layer, and freeze-drying to obtain the intelligent temperature control layer.

8. A method for preparing an intelligent temperature-controlled thermal insulation composite fabric according to any one of claims 1-7, characterized in that: Includes the following steps: The skin-friendly layer, intelligent temperature control layer, infrared shielding layer, and wear-resistant protective layer are sequentially stacked and then hot-pressed together.