A novel thermal insulation fabric and its preparation method

Abstract

This invention provides a novel thermal insulation fabric and its preparation method. The preparation method uses polyester material as the polymer matrix, Cs x Wo3NPs, as a photothermal conversion material, is melt-blended and extruded to obtain a composite masterbatch, which is then melt-spun into composite polyester fibers. These fibers are subsequently knitted with a certain proportion of spandex filaments to create a novel thermal insulation fabric. This fabric not only possesses excellent light absorption and heat generation properties, but also addresses the technical issues of easy coating peeling and short service life in finished textiles by encapsulating inorganic nanoparticles with organic polymers. This ensures the stability and safety of the photothermal conversion nanoparticle material. Furthermore, the fabric has a silky smooth feel, good elasticity, and excellent dyeing properties.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation fabric preparation technology, and in particular to a novel thermal insulation fabric and its preparation method. Background Technology

[0002] The industrialization of fibers has developed rapidly with the intensification of international competition and the improvement of people's living standards. People's attention to fibers has gradually shifted from ordinary fibers to new fibers with comfort, high added value, and intelligent functions. Among these, warmth is the primary functional choice for winter clothing, so the demand for fiber materials with excellent warmth retention is particularly urgent in the functional clothing market.

[0003] Textile insulation generally falls into two categories: passive insulation and active insulation. Passive insulation involves increasing fabric thickness or filling textiles with fibers of different structures to increase the air layer within the fabric, thus achieving insulation. Active insulation, on the other hand, uses fibers with heating or intelligent temperature regulation functions to convert other forms of energy into heat to warm the body. Passive insulation significantly increases the weight of textiles, reducing comfort. Intelligent responsive fibers, due to technological limitations, require additional functional components, similarly sacrificing comfort and lifespan. Therefore, developing fibers with heating functions is currently the best solution to balance the insulation and comfort of textiles.

[0004] Currently, heating fibers mainly include moisture-absorbing heating fibers and light-absorbing heating fibers. Moisture-absorbing heating fibers mainly utilize the high hygroscopicity of fiber materials to absorb gaseous water molecules in the environment and convert them into liquid water to release heat, thereby achieving the purpose of heating. However, this heating method has extremely high requirements for the moisture absorption performance of the fiber and has poor heating effect. Excessive moisture absorption can cause discomfort to the human body. The photothermal conversion materials used in current heating fibers are mostly graphene, Mxene, ZrC, etc. These materials are dark in color, so the heating fibers produced are mostly black or gray, which causes great trouble for the dyeing of textiles. Even if a specific color is dyed through complex methods, it will reduce its original heat retention performance. Therefore, this has become a great challenge for the application of heating textiles in the market today.

[0005] In view of this, it is necessary to design a new type of thermal insulation fabric with both dyeing and active heat retention functions, as well as its preparation method, to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a novel thermal insulation fabric and its preparation method.

[0007] To achieve the above-mentioned objective, this invention provides a method for preparing a novel thermal insulation fabric, comprising the following steps:

[0008] S1, Preparation of composite fibers: Polymer chips are mixed evenly with cesium tungsten bronze nanoparticles to obtain a mixture, which is then melt-blended and granulated to obtain a composite masterbatch; After that, the composite masterbatch is dried and mixed with conventional polymer chips, and then subjected to pressure melt spinning to prepare composite fibers;

[0009] S2, Preparation of composite fabric: The composite fiber is mixed with spandex filament and warped, and then woven into a composite fabric by knitting process;

[0010] S3, Preparation of novel thermal insulation fabric: The composite fabric is immersed in dye for dyeing treatment, then washed and dried to obtain a novel thermal insulation fabric with a predetermined color and active thermal insulation function.

[0011] As a further improvement of the present invention, in step S1, the mass ratio of the polymer slices and cesium tungsten bronze nanoparticles is (8-9):(1-2).

[0012] As a further improvement of the present invention, in step S1, the mixing mass ratio of the composite masterbatch and the conventional polymer chips is (1-2):(18-19).

[0013] As a further improvement of the present invention, in the pressurized melt spinning process described in step S1, the pressure is set to 2.0 to 3.0 MPa.

[0014] As a further improvement of the present invention, in step S1, the process of pressurized melt spinning is as follows: the pressure inside the spinning machine is adjusted by increasing the pump frequency, the temperature of the spinning machine is set, and after the spinning conditions are met, the composite masterbatch and polymer chips are mixed in proportion and added to the feed port for spinning.

[0015] As a further improvement of the present invention, in step S1, the polymer slice is a PET slice.

[0016] As a further improvement of the present invention, in step S2, the mixing ratio of composite fiber and spandex filament is (90-98):(2-10).

[0017] As a further improvement of the present invention, in step S3, the dye includes a dyeing agent and a fixing agent; the dyeing agent is one or more combinations of direct dyes and water-soluble anionic dyes; the fixing agent is a formaldehyde-free fixing agent.

[0018] As a further improvement of the present invention, in step S1, the cesium tungsten bronze nanoparticles are subjected to a dual modification pretreatment of silane coupling agent and maleic anhydride grafting.

[0019] To achieve the above-mentioned objectives, the present invention also provides a novel thermal insulation fabric prepared by the above-mentioned preparation method.

[0020] The beneficial effects of this invention are:

[0021] 1. The novel thermal insulation fabric provided by this invention not only possesses excellent light absorption and heat generation properties, but also solves the technical problems of easy peeling and short service life of post-finished textile coatings by encapsulating inorganic nanoparticles with organic polymers. This ensures the stability and safety of the photothermal conversion nanoparticle materials. Furthermore, the fabric has a silky smooth feel, good elasticity, and excellent dyeing effect. Moreover, this novel thermal insulation fabric exhibits a very rapid thermal response under xenon lamp irradiation (simulating sunlight), with a maximum temperature rise to 121°C or higher, demonstrating excellent photothermal conversion performance. In indoor simulation experiments, its thermal insulation effect is far superior to other thermal insulation fabrics.

[0022] 2. The method for preparing the novel thermal insulation fabric provided by this invention utilizes nanoparticles with photothermal conversion properties through melt spinning and knitting processes. This allows the textile to absorb light energy from the environment and convert it into heat energy, thereby achieving active heating and warmth retention. This ensures the stability and safety of the novel thermal insulation fabric, preventing discomfort such as poor warmth retention or significant reduction in humidity. The pressure melt spinning process makes the fibers more compact, significantly improving the toughness and abrasion resistance of the fiber filaments. It also ensures thorough and uniform mixing between the composite masterbatch and polymer chips, allowing the nanoparticles to be more stably and firmly loaded within the polymer. This significantly improves the mechanical and thermal insulation properties of the fabric.

[0023] 3. The novel thermal insulation fabric provided by this invention uses photothermal conversion nanoparticles as an inorganic filler, melt-blended with organic polymers. These inorganic nanoparticles can increase the crystallinity of the polymer fibers, effectively enhancing the mechanical properties of the fibers. Therefore, its tensile breaking performance is superior to other thermal insulation fabrics, making it more wear-resistant, with a longer service life, and suitable for customers of all body types. Furthermore, based on the conductive properties of the nanoparticles, this fabric exhibits excellent antistatic properties, far exceeding other thermal insulation fabrics, significantly reducing the probability of static electricity generation when putting on or taking off the thermal insulation fabric.

[0024] 4. The novel thermal insulation fabric provided by this invention has excellent dyeing and coloring effects. It can be dyed and colored in specific colors according to application requirements, and can further improve the photothermal conversion performance of the fabric without affecting its photothermal conversion performance. Attached Figure Description

[0025] Figure 1 The images shown are SEM and TEM images of the composite polyester fiber provided in Example 1 of this invention.

[0026] Figure 2 The images show actual photos of the thermal insulation fabrics provided in specific colors according to Embodiments 1-2 of the present invention.

[0027] Figure 3 The graph shows the photothermal conversion performance of the thermal insulation fabric provided in Embodiment 3 of the present invention.

[0028] Figure 4 The graphs show the photothermal conversion performance of the thermal insulation fabrics provided in Embodiments 1-3 of this invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0031] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] This invention provides a method for preparing a novel thermal insulation fabric, which includes the following steps:

[0033] S1, Preparation of composite fibers: Polymer chips are mixed evenly with cesium tungsten bronze nanoparticles to obtain a mixture, which is then melt-blended and granulated to obtain a composite masterbatch; After that, the composite masterbatch is dried and mixed with conventional polymer chips, and then subjected to pressure melt spinning to prepare composite fibers;

[0034] S2, Preparation of composite fabric: The composite fiber is mixed with spandex filament and warped, and then woven into a composite fabric by knitting process;

[0035] S3, Preparation of novel thermal insulation fabric: The composite fabric is immersed in dye for dyeing treatment, then washed and dried to obtain a novel thermal insulation fabric with a specific color and active thermal insulation function.

[0036] Preferably, in step S1, the mass ratio of the polymer slices and cesium tungsten bronze nanoparticles is (8-9):(1-2).

[0037] Preferably, in step S1, the mixing mass ratio of the composite masterbatch and conventional polymer chips is (1-2):(18-19).

[0038] Preferably, in the pressurized melt spinning process described in step S1, the pressure is set to 2.0 to 3.0 MPa.

[0039] Preferably, in step S1, the process of pressurized melt spinning is as follows: the pressure inside the spinning machine is adjusted by increasing the pump frequency, the temperature of the spinning machine is set, and after the spinning conditions are met, the composite masterbatch and polymer chips are mixed in proportion and added to the feed port for spinning.

[0040] Preferably, in step S1, the polymer slice is a PET slice.

[0041] Preferably, in step S2, the mixing ratio of composite fiber to spandex filament is (90-98):(2-10).

[0042] Preferably, in step S3, the dye includes a dyeing agent and a fixing agent; the dyeing agent is one or more combinations of direct dyes and water-soluble anionic dyes; and the fixing agent is a formaldehyde-free fixing agent.

[0043] Preferably, in step S1, the cesium tungsten bronze nanoparticles undergo a dual modification pretreatment involving silane coupling agent and maleic anhydride grafting.

[0044] Example 1

[0045] Embodiment 1 of the present invention provides a novel thermal insulation fabric, the preparation method of which includes the following steps:

[0046] S1, Screening of Photothermal Nanopowders and Thermoplastic Polymers: Through comprehensive analysis of the properties of commercially available photothermal nanopowders and thermoplastic polymers, Cs was selected. X WO3 NPs (cesium tungsten bronze nanoparticles) are photothermal nanoparticles, using PET (polyester), the most widely used thermoplastic polymer in the chemical fiber industry, as the base material.

[0047] Cs X Preparation of WO3 / PET composite polyester fibers: First, PET chips are combined with Cs... X WO3 nanoparticles were added to a vertical high-speed mixer at a mass ratio of 9:1 and stirred at high speed to ensure uniform mixing of the two raw materials. Subsequently, the blended materials were fed into a twin-screw extruder for melt blending extrusion and pelletizing to obtain Cs. X WO3 / PET masterbatch, followed by the preparation of Cs X After thoroughly drying WO3 / PET masterbatch and conventional PET chips, they are mixed evenly at a mass ratio of 1:19 and fed into the feed hopper of a melt spinning machine for pressurized melt spinning to prepare Cs. X WO3 / PET composite fibers, such as Figure 1 As shown.

[0048] The parameters for the pressurized melt spinning process are shown in the table. By increasing the pump frequency, the pressure inside the spinning machine is adjusted (pressure is set to 2.0 MPa). The temperature is 290℃, which allows the melting process to be more complete and removes impurities.

[0049]

[0050] S2, Cs X WO3 / PET composite fiber and spandex filament are mixed and warped in a certain ratio (95:5), and then woven into composite fabric through knitting process;

[0051] S3, the composite fabric is immersed in dye for dyeing treatment: A dye is prepared by mixing 2.5g of dyeing agent (turquoise direct dye), 2.5g of formaldehyde-free fixing agent, and 245g of deionized water. The thermal insulation fabric is then immersed in the dye for dyeing at a liquor ratio of 1:10. The mixture is kept at a constant temperature of 80℃ in a forced-air drying oven for 24 hours. Finally, the fabric is removed, washed, and dried to obtain a new type of thermal insulation fabric with a turquoise blue color and active heat retention function. Figure 2 As shown.

[0052] Example 2

[0053] This embodiment 2 provides a novel thermal insulation fabric, the preparation method of which includes the following steps:

[0054] S1, Screening of Photothermal Nanopowders and Thermoplastic Polymers: Through comprehensive analysis of the properties of commercially available photothermal nanopowders and thermoplastic polymers, Cs was selected. X WO3 NPs (cesium tungsten bronze nanoparticles) are photothermal nanoparticles, using PET (polyester), the most widely used thermoplastic polymer in the chemical fiber industry, as the base material.

[0055] Cs X Preparation of WO3 / PET composite polyester fibers: First, PET chips are combined with Cs... X WO3 nanoparticles were added to a vertical high-speed mixer at a mass ratio of 9:1 and stirred at high speed to ensure uniform mixing of the two raw materials. Subsequently, the blended materials were fed into a twin-screw extruder for melt blending extrusion and pelletizing to obtain Cs. X WO3 / PET masterbatch, followed by the preparation of Cs X After thoroughly drying, WO3 / PET masterbatch and conventional PET chips are mixed evenly at a mass ratio of 1:19 and fed into the feed hopper of a melt spinning machine for melt spinning to prepare Cs. X WO3 / PET composite fiber.

[0056] The settings for the melt spinning machine are shown in the table below:

[0057]

[0058] S2, Cs X WO3 / PET composite fiber and spandex filament are mixed and warped in a certain ratio (95:5), and then woven into composite fabric through knitting process;

[0059] S3, the composite fabric is immersed in dye for dyeing treatment: A dye is prepared by mixing 2.5g of dyeing agent (deep pink direct dye), 2.5g of formaldehyde-free fixing agent, and 245g of deionized water. The thermal insulation fabric is then immersed in the dye for dyeing at a liquor ratio of 1:10. The mixture is kept at a constant temperature of 80℃ in a forced-air drying oven for 24 hours. Finally, the fabric is removed, washed, and dried to obtain a new type of deep pink thermal insulation fabric with active warmth retention function. Figure 2 As shown.

[0060] Example 3

[0061] The difference from Example 1 is that no dyeing treatment is performed to prepare the composite fabric.

[0062] Comparative Examples 1-5

[0063] Commercially available thermal insulation fabrics from different brands were used as comparative examples 1 to 5.

[0064] Comparative Example 6

[0065] The difference from Example 1 is that step S1 is omitted; instead, polyester fibers and spandex filaments are directly mixed and warped in a certain proportion, and then knitted to obtain a composite fabric. (Blank comparative example)

[0066] Comparative Example 7

[0067] The difference from Example 1 is that no pressurization process is performed.

[0068] Examples 4-5

[0069] The difference from Example 1 is that the PET slices and Cs X The mass ratio of WO3 nanoparticles varies.

[0070] Example <![CDATA[Cs X WO3 nanoparticle ratio Example 1 10％ Example 4 15％ Example 5 20％

[0071] Example 6

[0072] The difference from Example 1 is that in step S1, Cs X The WO3 nanoparticles underwent pretreatment as follows:

[0073] Cs X WO3 inorganic nanoparticles were dispersed in an alcohol medium, and then coated with a silane coupling agent KH570 to obtain modified Cs. XWO3-NH2 nanoparticles were then subjected to an amidation reaction between the amino groups on a silane coupling agent and maleic anhydride, thereby obtaining modified Cs based on the silane coupling agent and maleic anhydride grafting pretreatment of cesium tungsten bronze nanoparticles. X WO3 nanoparticles.

[0074] The fabrics provided in the above embodiments and comparative examples were subjected to performance tests.

[0075] Please see Figure 1 As shown in the SEM image, Cs X The addition of WO3 nanoparticles did not affect the morphology of the PET fibers; the fibers remained irregularly cylindrical with uniform thickness and a flat cross-section. Combined with TEM images, it can be seen that Cs... X WO3 nanoparticles have been successfully doped into the fiber and are well dispersed.

[0076] Please see Figure 3-4 The comparison of insulation effects shown demonstrates that the fabric surface temperature rises rapidly under xenon lamp illumination (a simulated sunlight).

[0077] By comparing the photothermal conversion performance of the thermal insulation fabrics before and after dyeing in Examples 1-3, it can be found that the temperature of the dyed thermal insulation fabrics (Examples 1-2) is significantly increased by about 6°C compared with Example 3. This indicates that dyeing does not affect the photothermal conversion performance of the thermal insulation fabrics, and the color is darker after dyeing, which has a higher light absorption capacity than white fabrics. Therefore, the photothermal conversion capacity of the fabrics is improved to a certain extent.

[0078] Comparison of warmth retention: In a constant indoor temperature (approximately 22°C), after the participants wore the warming fabric for 30 minutes, the performance of various warming fabrics was tested by comparing the warmth retention effects of different brands of warming fabrics.

[0079]

[0080] As shown in the table above, after 30 minutes, the temperature of the upper body trunk of the traditional thermal insulation fabrics in Comparative Examples 1-5 fluctuated between 27-29℃, while the temperature range of the blank control fabric in Comparative Example 6 was 22.5-24.1℃. However, the novel thermal insulation fabric prepared in Example 3 can maintain the temperature of the upper body trunk at around 33℃, significantly exceeding the thermal insulation effect of other thermal insulation fabrics. Furthermore, the temperature of the dyed thermal insulation fabric prepared in Example 1 can reach 33.8℃, higher than the thermal insulation performance of Example 3.

[0081] Tensile breaking performance comparison: Different types of thermal insulation fabrics were cut into 2×5cm samples, and then both ends were fixed to the INSTRON fixture. The breaking strength of the samples was tested at a tensile speed of 0.1m / min.

[0082] Example Types of thermal fabrics Tensile breaking strength / MPa Comparative Example 1 Thermal fabric 1 44 Comparative Example 2 Warm fabric 2 45 Comparative Example 3 Warm fabric 3 48 Comparative Example 4 Thermal fabric 4 46 Comparative Example 5 Thermal fabric 5 47 Comparative Example 6 Blank contrast fabric 45 Example 3 New type of thermal insulation fabric 53

[0083] The tensile breaking test shows that the tensile breaking strength of the novel thermal insulation fabric in Example 3 is higher than that of other traditional thermal insulation fabrics. This is because Cs x Wo3 NPs act as nucleating agents during melt spinning, increasing the Cs content. x The increased crystallinity of Wo3 / PET composite polyester fibers effectively enhances the mechanical properties of the fibers.

[0084] Antistatic performance comparison: Prepare paper scraps of the same size, wrap a plastic ruler around a thermal fabric and rub it back and forth 30 times, bring it close to the paper scraps, count the paper scraps attracted, repeat three times and take the average value.

[0085] Example Types of thermal fabrics Number of paper scraps picked up / sheet Comparative Example 1 Thermal fabric 1 22.26 Comparative Example 2 Warm fabric 2 17.65 Comparative Example 3 Warm fabric 3 14.23 Comparative Example 4 Thermal fabric 4 9.25 Comparative Example 5 Thermal fabric 5 13.45 Comparative Example 6 Blank contrast fabric 16.42 Example 3 New type of thermal insulation fabric 2.45

[0086] As shown in the table, the antistatic properties of the novel thermal insulation fabric in Example 3 are superior to those of other thermal insulation fabrics, based on Cs x The conductive properties of Wo3 can effectively improve the conductivity of new thermal insulation fabrics, thereby greatly reducing the probability of static electricity generated when the thermal insulation fabric is put on or taken off.

[0087] By comparing Example 1 with Comparative Example 7, the tensile breaking strength and thermal insulation performance of the fabric in Example 1 are higher than those in Comparative Example 7. This is mainly because the pressure melt spinning process makes the fibers more compact, which significantly improves the toughness and abrasion resistance of the fiber filaments. Furthermore, the pressure process allows the composite masterbatch and polymer chips to be fully and uniformly mixed, making the nanoparticles more stably and firmly loaded inside the polymer. Thus, the mechanical properties and thermal insulation performance of the fabric can be significantly improved.

[0088] By comparing Examples 1 and 4-5, Cs X The mass percentage of WO3 nanoparticles affects the photothermal conversion performance, mechanical properties, and antistatic properties of fibers, which in turn affects the performance of various aspects of thermal insulation fabrics.

[0089] Comparing Examples 1 and 6, Example 6 shows that its photothermal conversion performance, tensile fracture performance, and thermal insulation performance are all higher than those of Example 1. This is mainly due to: the improvement of Cs... X WO3 nanoparticles undergo dual modification treatment, based on the presence of amino and silane groups in the silane coupling agent molecule, which makes Cs... X WO3 nanoparticles exhibit good dispersibility in polymer chip mixtures, and maleic anhydride can be further grafted onto them with amino groups to obtain maleic anhydride-grafted Cs. XWO3 nanoparticles. Maleic anhydride grafts, under high temperature and screw shearing during the melting process, allow the anhydride groups to undergo dehydration reactions with polar groups and form chemical bonds, chemically coupling incompatible polar and nonpolar substances. They possess both polar aldehyde groups and nonpolar olefin segments, enabling them to interact with organic polymers and inorganic Cs... X The chemical bonds between WO3 nanoparticle fillers significantly improve the compatibility of the two components in the hybrid system, resulting in a further significant increase in the strength and toughness of the composite fiber, and overcoming the limitations of inorganic Cs in the hybrid system. X The incompatibility between WO3 nanoparticles and organic polyester chips leads to inorganic Cs X The technical problem is that WO3 nanoparticles agglomerate and cannot be uniformly and firmly loaded onto the surface and interior of polyester fibers.

[0090] Furthermore, the dual modification treatment with silane coupling agent and maleic anhydride enables the composite polyester fiber to possess certain hydrophilic properties, forming moisture-wicking channels between it and the spandex filament. Based on the dual modification of inorganic Cs... X The various active groups on WO3 nanoparticles can combine and react with the active groups on the dye during the dyeing process, giving it stable and long-lasting color fastness.

[0091] In summary, this invention provides a novel thermal insulation fabric and its preparation method. The method uses polyester as the polymer matrix and CsxWo3 NPs as the photothermal conversion material. A composite masterbatch is obtained through melt blending and extrusion, followed by melt spinning to prepare composite polyester fibers. These fibers are then knitted with a certain proportion of spandex filaments to form a novel thermal insulation fabric. This fabric not only possesses excellent light absorption and heat generation properties, but also addresses the technical problems of easy coating peeling and short service life in finished textiles by encapsulating inorganic nanoparticles with organic polymers. This ensures the stability and safety of the photothermal conversion nanoparticle material. Furthermore, the fabric has a silky smooth feel, good elasticity, and excellent dyeing properties.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a novel thermal insulation fabric, characterized in that: Includes the following steps: S1, Preparation of composite fibers: After the polymer chips are mixed evenly with cesium tungsten bronze nanoparticles, a mixture is obtained, which is then melt-blended and granulated to obtain a composite masterbatch; after the composite masterbatch and polymer chips are dried and mixed, they are then melt-spun under pressure to obtain composite fibers. S2, Preparation of composite fabric: The composite fiber is mixed with spandex filament and warped, and then woven into a composite fabric by knitting process; S3, Preparation of novel thermal insulation fabric: The composite fabric is immersed in dye for dyeing treatment, then washed and dried to obtain a novel thermal insulation fabric with a predetermined color and stable color fastness and thermal insulation function. In step S1, the pressure of the pressurized melt spinning is set to 2.0~3.0 MPa; The polymer chips are PET chips; In step S1, the cesium tungsten bronze nanoparticles are modified cesium tungsten bronze nanoparticles that have undergone a double modification pretreatment with silane coupling agent and maleic anhydride grafting. The method for pretreatment with silane coupling agent and maleic anhydride grafting is as follows: Cesium tungsten bronze nanoparticles were dispersed in an alcohol medium, and then coated with a silane coupling agent to obtain modified Cs. X WO3-NH2 nanoparticles were then subjected to an amidation reaction between the amino groups on a silane coupling agent and maleic anhydride to obtain the modified cesium tungsten bronze nanoparticles.

2. The method for preparing the novel thermal insulation fabric according to claim 1, characterized in that: In step S1, the mass ratio of polymer slices to cesium tungsten bronze nanoparticles is (8~9):(1~2).

3. The method for preparing the novel thermal insulation fabric according to claim 1, characterized in that: In step S1, the mass ratio of the composite masterbatch and polymer chips is (1~2):(18~19).

4. The method for preparing the novel thermal insulation fabric according to claim 1, characterized in that: In step S1, the process of pressurized melt spinning is as follows: the pressure inside the spinning machine is adjusted by increasing the pump frequency, the temperature of the spinning machine is set, and after the spinning conditions are met, the composite masterbatch and polymer chips are mixed in proportion and added to the feed port for spinning.

5. The method for preparing the novel thermal insulation fabric according to claim 1, characterized in that: In step S2, the mixing ratio of composite fiber and spandex filament is (90~98):(2~10).

6. The method for preparing the novel thermal insulation fabric according to claim 1, characterized in that: In step S3, the dye includes a dyeing agent and a fixing agent; the dyeing agent is a water-soluble anionic dye; and the fixing agent is a formaldehyde-free fixing agent.

7. A novel thermal insulation fabric, characterized in that: It is prepared by the method of preparing the novel thermal insulation fabric according to any one of claims 1 to 6.

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