Composite-structure suede fabric with temperature control and aurora resistance functions and preparation method of composite-structure suede fabric

Abstract

The invention discloses a composite structure suede fabric with temperature control and aurora resistance functions and a preparation method. The preparation method comprises the following steps: preparing an inorganic mesoporous silica skeleton; a phase change material is loaded through vacuum impregnation, and then a wrapping layer is formed through surface modification; blending and granulating the modified composite phase change material and polyethylene glycol terephthalate to obtain island component master batch containing the composite phase change material; a sea-island composite spinning process is adopted, the master batch is used as an island, alkali-soluble copolyester is used as a sea, spinning is performed through a spinneret plate provided with a plurality of functional units, and each functional unit comprises at least two types of special-shaped section spinneret orifices arranged according to a preset sequence; the sea-island fibers are woven into gray fabric, and the chamois suede fabric is obtained through aftertreatment processing. The phase-change material is resistant to spinning and dyeing and finishing processing through inorganic framework loading and surface modification, the phase-change material cooperates with the multi-special-shaped-section fiber, the temperature control and aurora-resistant functions of the suede fabric are integrated, and the fabric is good in washability.

Description

Technical Field

[0001] This invention relates to the field of textile manufacturing technology, and in particular to a composite suede fabric with temperature control and aurora protection functions, and its preparation method. Background Technology

[0002] Traditional suede fabric is widely used in clothing, home furnishings and automotive interiors due to its soft feel and elegant velvet texture. However, traditional suede fabric has the following technical problems in use: (1) Suede fabric faces the problem of "aurora" caused by local friction when the pile flattens. Existing technologies mostly use the addition of matting agents such as titanium dioxide and irregular cross-section fibers to scatter light. For example, patent CN107604464B discloses a method for preparing a double irregular cross-section moisture-wicking fiber, and patent CN113737292B discloses a polyester fully matte ultra-fine denier POY fiber and its production method. However, these methods are single in function, and it is difficult to completely avoid the aurora problem after local friction by simply relying on matting agents or fiber cross-section design. Moreover, the excessive addition of matting agents will lead to dull fabric color and deteriorated feel. (2) Suede is mostly used in autumn and winter clothing, but suede used for pleating process needs to be relatively thin, which contradicts the need for warmth in autumn and winter. Phase change microcapsule (PCM) technology has been attempted to be applied to textiles to achieve temperature regulation. However, existing technologies typically use PCM microcapsules as a single-function finishing agent, applying them to the fabric surface through padding or coating. This finishing method not only suffers from drawbacks such as easy microcapsule detachment and poor durability, but also the addition of a large number of microcapsules can clog the fiber gaps, affecting the original breathability and hand feel of the fabric, making it difficult to balance temperature control and the natural texture of suede.

[0003] Therefore, existing technologies lack a systematic solution that integrates thermal management functions with structural anti-collapse and matting functions from the fiber design stage. Simple functional superposition often leads to reduced optical efficiency, deteriorated feel, or insufficient functional durability, failing to achieve synergistic effects of multiple functions such as temperature control, aurora resistance, and anti-collapse. Summary of the Invention

[0004] This application provides a composite structure suede with temperature control and aurora protection functions and a preparation method, which solves the technical problems of existing suede having a single function, difficulty in achieving both temperature control and aurora protection functions, and insufficient functional durability. It realizes the integration of intelligent temperature control with structural anti-collapse and matting functions from the fiber design source, while maintaining the soft feel of suede and giving the fabric lasting and stable temperature control performance and aurora protection effect.

[0005] This application provides a method for preparing a composite suede fabric with temperature control and aurora protection functions, comprising the following steps:

[0006] Step 1: Preparation of an inorganic mesoporous silica framework;

[0007] Step 2 involves loading the phase change material into the channels of the skeleton described in Step 1 using a vacuum impregnation method to obtain the composite phase change material.

[0008] Step 3 involves surface modification of the composite phase change material obtained in Step 2 to form an encapsulation layer, thereby obtaining a surface-modified composite phase change material.

[0009] Step four involves blending and granulating the surface-modified composite phase change material from step three with polyethylene terephthalate to obtain an "island" component masterbatch containing the composite phase change material.

[0010] Step 5 employs an island-sea composite spinning process, using the "island" component masterbatch containing composite phase change material described in Step 4 as the island component and the alkali-soluble copolyester as the "sea" component. Spinning is performed through a spinneret, which has multiple functional units. Each functional unit contains at least two different types of spinneret holes with irregular cross-sections, arranged in a predetermined order.

[0011] Step six involves weaving the island fibers into a greige fabric, followed by finishing processes to obtain a composite suede fabric. The finishing processes include at least alkali reduction fiber opening, napping, dyeing, and setting processes. The order and specific parameters of each process are adjusted according to conventional processes.

[0012] Preferably, the inorganic mesoporous silica framework in step one is prepared by hydrothermal synthesis, using hexadecyltrimethylammonium bromide as a template, and after calcination to remove the template, a mesoporous framework with a pore size of 6-8 nm is obtained.

[0013] Preferably, the hexadecyltrimethylammonium bromide template agent can be replaced with at least one of the shea butter-derived cationic surfactant SBATC or Gemini quaternary ammonium salt surfactants.

[0014] Preferably, the surface modification treatment in step three specifically involves: in the presence of a catalyst, cross-linking and coating the composite phase change material with a hydrophobic material to form a hydrophobic layer, wherein the catalyst is selected from at least one of a bismuth-zirconium bimetallic catalyst, a zinc-zirconium composite catalyst, an organotitanium catalyst, or an organocerium catalyst; and the hydrophobic material is selected from at least one of polymethylhydrosiloxane, vinyl-terminated polydimethylsiloxane, capsaicin-modified polymethylhydrosiloxane, or hydroxyl-containing organosilicon oil.

[0015] Preferably, the surface modification treatment in step three specifically involves: first forming a polyurea shell on the surface of the composite phase change material using interfacial polymerization, and then hydrophobizing the surface of the polyurea shell with polymethylhydrosiloxane.

[0016] Preferably, the spinneret cross-sectional shape in step five includes at least two of the following: a first type of cross-section, a second type of cross-section, and a third type of cross-section; wherein the first type of cross-section is multi-leaf-shaped or irregular, the second type of cross-section is flat, cross-shaped, or H-shaped, and the third type of cross-section is sharp-edged.

[0017] Preferably, the multi-leaf shape in step five is a four-leaf or three-leaf shape, and the sharp-angled shape is a Y-shape or a triangle.

[0018] Preferably, the content of the composite phase change material in the "island" component masterbatch in step three is 9-13%.

[0019] Preferably, the phase change material in step one is an alkane, a fatty acid, or a mixture of both, with a phase change temperature range of 18-32°C.

[0020] This application also provides a composite structure suede made by any of the above preparation methods, wherein the suede, after being subjected to a Martindale abrasion resistance test, exhibits a gloss change rate of less than 9%.

[0021] The multiple technical solutions provided in the embodiments of this application have at least the following technical effects:

[0022] 1. This application uses an inorganic mesoporous silica framework to load phase change materials and then performs surface modification treatment on them, replacing the traditional single phase change microcapsules and matting agents. The modified composite phase change material not only endows the fabric with intelligent temperature control capabilities through the phase change core material, but its inorganic framework and surface modification layer also have certain light scattering functions. This works synergistically with the structural anti-collapse and matting effects provided by the irregular cross-section fibers, achieving a fundamental unity of optical, thermal, and mechanical properties.

[0023] 2. This application utilizes the physical adsorption of the inorganic mesoporous framework and the dual chemical / physical protection of the surface modification layer to enable the phase change material to withstand the harsh conditions of high temperature (230℃) during spinning and dyeing and finishing (98℃ alkaline solution), fundamentally solving the industry problem of easy rupture and leakage and rapid functional decay of traditional phase change microcapsules in textile processing. Testing has verified that the initial thermal decomposition temperature of the composite phase change material can reach 318℃ (Example 1) or even 325℃ (Example 2, triple protection), and there is no leakage after heating at 230℃ for 10 minutes; after 12 household washes, the phase change enthalpy retention rate is ≥91.2%, significantly better than traditional finishing processes.

[0024] 3. In the suede fabric prepared in this application, the phase change material is uniformly distributed inside or near the surface of the suede fibers. It can actively absorb or release heat through solid-liquid phase change according to changes in ambient or body surface temperature, effectively buffering temperature fluctuations and providing intelligent "warm in winter and cool in summer" comfort. At the same time, since the phase change material is effectively protected by the inorganic skeleton and surface modification layer, its temperature control function remains stable throughout the entire service life of the fabric, expanding the application value of suede in all-season clothing, automotive interiors and other scenarios.

[0025] 4. This application utilizes the fine light scattering effect of the inorganic mesoporous skeleton and surface-modified layer, combined with the complex reflection of irregularly shaped cross-section fibers, to create a soft, deep, and layered matte appearance. Simultaneously, the composite phase change material is embedded within the fiber through spinning, without damaging the fiber surface structure, allowing the fabric to retain the unique soft feel and plush texture of suede.

[0026] 5. This application provides two optional surface modification paths. The PMHS catalytic crosslinking path of Example 1 forms a thin and dense hydrophobic layer, which has little impact on the fiber feel and excellent heat resistance, making it suitable for high-end clothing, automotive interiors, and high-end home textiles where a good feel is required. The polyurea shell path of Example 2 has good wash resistance and is suitable for sportswear, outdoor products, mid-to-low-end home textiles, and fast fashion products that are frequently washed. The optional triple protection scheme of Example 2 has better performance and is suitable for industrial and special protection applications where high performance is required. It can be selected according to the cost and performance requirements of the target application scenario.

[0027] 6. When the fabric prepared in this application is used in clothing, home furnishings or automotive interiors, it can reduce the dependence on additional heating or cooling through microclimate regulation, which is in line with the trend of green energy conservation and sustainable development. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the two-dimensional functional unit design of the spinneret in Embodiment 1 of this application. Detailed Implementation

[0029] The overall concept of this application's embodiments is as follows:

[0030] Starting from the source of fiber design, a three-in-one system design of "inorganic skeleton loaded with phase change material - surface modification protection - irregular cross-section island spinning" is used to achieve the structural integration of temperature control function and aurora resistance function.

[0031] Specifically, this application first constructs an inorganic mesoporous silica framework, utilizing its high specific surface area and nanopores to fix the phase change material via capillary adsorption, solving the problem of easy rupture and leakage of traditional phase change microcapsules under high temperature, alkaline solution, and other dyeing and finishing conditions. Secondly, the composite particles loaded with the phase change material undergo surface modification treatment to form a protective layer with water and alkali resistance, enabling it to withstand the harsh conditions of subsequent spinning and dyeing and finishing processes. Thirdly, the surface-modified composite phase change material is blended and granulated with polyester as the "island" component, and an alkali-soluble copolyester is used as the "sea" component. The components are spun into island-shaped composite fibers through a specially designed spinneret. The spinneret has multiple functional units, and each unit has at least two different types of spinneret holes arranged in a predetermined order, so that the final fiber has a multi-shaped cross-section distribution. Finally, after the "sea" component is removed by alkali reduction fiber opening, the "island" component containing composite phase change material forms ultrafine fiber. The composite phase change material is distributed inside the ultrafine fiber, which can effectively sense changes in ambient temperature. At the same time, the multi-shaped cross-section fiber provides structural anti-collapse and light scattering functions. The two work together to achieve the integration of temperature control and anti-polarity functions.

[0032] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0033] Example 1

[0034] (1) Preparation of inorganic mesoporous silica framework

[0035] Weigh 0.8 g of hexamethylenetetramine (HMTA) and dissolve it in 40 mL of deionized water. Add 2.2 g of cetyltrimethylammonium bromide (CTAB) and stir magnetically at 28 °C for 20 min until completely dissolved to obtain solution A. Dissolve 3.2 mL of tetraethyl orthosilicate (TEOS) and 2.0 mL of n-pentanol in 50 mL of cyclohexane and stir to obtain solution B.

[0036] Solution A and solution B were mixed and pre-emulsified for 5 min at 10000 r / min using a high-shear emulsifier. Immediately after pre-emulsification, the mixture was transferred to an ultrasonic cell disruptor and ultrasonically emulsified for 15 min at 200 W to obtain a submicron-sized fine emulsion template (the system temperature was controlled to not exceed 30℃ during the emulsification process). The mixture was then transferred to a hydrothermal reactor, heated to 120℃ at a rate of 2℃ / min and held for 4 hours. The temperature was then slowly increased to 150℃ at a rate of 0.5℃ / min and held for 12 hours. After the reaction, the mixture was allowed to cool naturally to room temperature and stand for 6 hours. The product was washed four times alternately with ethanol and water, dried at 85℃ for 12 hours, and then ground into powder. The powder was then placed in a muffle furnace and heated to 550℃ at a rate of 2℃ / min. The temperature was maintained for 6 h, and after natural cooling, the CTAB template was removed to obtain a mesoporous silica framework. The specific surface area of ​​the mesoporous silica framework was tested to be ≥650 m² / g, the average pore diameter was 6.8 nm, and the pore volume was 1.2 cm³ / g.

[0037] The hexadecyltrimethylammonium bromide template agent can be replaced with at least one of the shea butter-derived cationic surfactant SBATC or Gemini quaternary ammonium salt surfactants.

[0038] (2) Loading of phase change materials

[0039] 10g of the mesoporous silica framework prepared in step (1) was placed in a three-necked flask, and the vacuum was evacuated to -0.098 MPa and maintained for 45 min to remove air from the pores of the framework. Under vacuum, 9.0g of molten n-octadecane at 45℃ was slowly added dropwise through a constant-pressure dropping funnel at a rate of 1.0 mL / min. After the addition was complete, the vacuum was maintained for 1.5 h to allow the phase change material to fully enter the pores. The pressure was restored to normal, and the temperature was raised to 50℃ and stirred at a constant temperature for 3 h to allow the phase change material to be further adsorbed by capillary action. The resulting product was rapidly washed three times with anhydrous ethanol at 45℃, centrifuged to remove the physically attached phase change material, and dried under vacuum at 45℃ for 12 h to obtain composite phase change material powder.

[0040] (3) Surface hydrophobication treatment

[0041] ① Catalyst preparation: Mix 0.08 g acetylacetone with 0.11 g zirconium isopropoxide (70% isopropanol solution) and stir for 10 min. Add 0.19 g bismuth neodecanoate (20% Bi), stir at 40℃ for 15 min, and dilute with 1.5 g isopropanol to obtain Bi-Zr catalyst solution.

[0042] ② Preparation of microemulsion: 3.0 g of polymethylhydrosiloxane (PMHS) and 10 g of n-hexane were mixed to form the oil phase, and 1.2 g of sodium dodecyl sulfate (SDS), 1.88 g of the catalyst solution from step ①, and 80 mL of deionized water were mixed to form the aqueous phase. The oil phase was added to the aqueous phase under a shear rate of 10000 r / min, and emulsified for 10 min to obtain the microemulsion.

[0043] ③ Hydrophobic treatment: Add 10 g of the composite phase change material powder obtained in step (2) to the microemulsion obtained in step ②, stir at 65℃ for 3 h, centrifuge after the reaction is completed, wash with anhydrous ethanol, and vacuum dry at 50℃ for 4 h.

[0044] ④ Micro-negative pressure curing and post-crosslinking: The product from step ③ is placed in a vacuum oven, first at 80℃ for 2 h with a vacuum of -0.08 MPa, to allow the catalyst to diffuse fully and PMHS to be initially adsorbed; then the temperature is increased to 100℃ for 3 h at a rate of 2℃ / min (maintaining micro-negative pressure). The micro-negative pressure environment can effectively remove the reaction byproduct hydrogen gas and avoid the loss of trace amounts of PMHS due to volatilization under high vacuum, ensuring full crosslinking within 5 hours. After centrifugation, the powder is quickly rinsed once with anhydrous ethanol. The rinsed wet powder is spread evenly on a polytetrafluoroethylene tray (thickness <1 cm) and placed in a vacuum drying oven: the temperature is increased from room temperature to 120℃ within 40 min, then kept at that temperature for 2 h, and naturally cooled to below 40℃ to obtain a hydrophobic composite phase change material powder.

[0045] The bismuth-zirconium bimetallic catalyst can also be replaced by at least one of zinc-zirconium composite catalyst, organotitanium catalyst, or organocerium catalyst.

[0046] Polymethylhydrosiloxane can also be replaced by at least one of vinyl-terminated polydimethylsiloxane, capsaicin-modified polymethylhydrosiloxane, or hydroxyl-containing silicone oil.

[0047] (4) Blending and granulation

[0048] The hydrophobic composite phase change material powder from step (3) was mixed with polyethylene terephthalate (PET) chips (intrinsic viscosity 0.68 dL / g) at a mass ratio of 1:8 in a high-speed mixer for 8 min. The mixture was then fed into a twin-screw extruder for melt blending and granulation. The temperatures were set as follows: zone 1 260℃, zone 2 265℃, zone 3 270℃, zone 4 270℃, and die head 265℃. The screw speed was 200 r / min. The extruded strip was water-cooled and pelletized to obtain PET masterbatch containing microcapsules (microcapsule content approximately 11%).

[0049] (5) Spinneret design and island-sea composite spinning

[0050] The spinneret has 128 spinning positions, each corresponding to a "functional unit." Each functional unit uses a 2x6 two-dimensional matrix to arrange irregularly shaped spinnerets, such as... Figure 1 As shown:

[0051] Row 1 (from inside to outside): Quadrifoglio (S) - Flat (F) - Quadrifoglio (S) - Triangle (T) - Flat (F) - Quadrifoglio (S);

[0052] Row 2: Quadrifoglio (S) - Triangle (T) - Flat (F) - Quadrifoglio (S) - Quadrifoglio (S) - Flat (F).

[0053] In this embodiment, the four-leaf shape belongs to the first type of cross-section (multi-leaf shape), the flat shape belongs to the second type of cross-section (flat shape), and the triangle shape belongs to the third type of cross-section (sharp-edged shape). The three types of cross-sections are arranged and combined in a predetermined order to achieve a synergistic anti-aurora effect of multi-shaped cross-section fibers.

[0054] In another embodiment, the first type of cross-section can be a trilobal shape instead of a tetralobal shape, and the third type of cross-section can be a Y-shaped shape instead of a triangular shape, which can also achieve the anti-aurora synergistic effect of multi-shaped cross-section fibers.

[0055] Each spinneret has a characteristic dimension of 0.06 mm and a spacing of 0.55 mm.

[0056] Spinning raw materials: "Island" component: the above-mentioned PET masterbatch containing microcapsules is mixed with pure PET chips in a 1:4 ratio; "Sea" component: alkali-soluble copolyester (COPET, SIPM content 12 mol%).

[0057] (6) Composite spinning: The island composite spinning machine is used. The spinning temperature is set as follows: island component 278℃, sea component 268℃, spinning speed 1150 m / min. The fabric is woven on a 32E double-sided circular weft machine with a 1+1 rib structure.

[0058] Finishing: Pre-setting the greige fabric at 195℃; Alkali reduction fiber opening: NaOH 12 g / L, 98℃ for 45 min, hot water washing and neutralization; Brushing; High temperature and high pressure dyeing (disperse dye, 125℃×45 min); Reduction cleaning; Setting at 165℃, finally obtaining the finished suede fabric-1.

[0059] (4) Performance testing

[0060] The test methods and test results are shown in Table 1.

[0061] Table 1 Performance Test Results

[0062]

[0063] The results in Table 1 show that the fabric has a phase change enthalpy of 100.8 J / g, which can provide a stable thermal buffering effect in the human comfort zone (18-32℃), giving the fabric an intelligent "warm in winter and cool in summer" feel; there is no leakage after heating at 230℃ for 10 min; the contact angle is 152° after alkali treatment; the gloss change rate after Martindale abrasion resistance is <8%; and the phase change enthalpy retention rate is 91.2% after 12 washes, indicating good temperature control and anti-aurora effects.

[0064] The phase change material described in this invention is not limited to n-octadecane used in Example 1, but can also be a fatty acid eutectic mixture, such as a decanoic acid-lauric acid eutectic mixture, a decanoic acid-myristic acid eutectic mixture, etc. By adjusting the eutectic ratio, any phase change temperature within the range of 18-32℃ can be achieved. Because the mesoporous silica framework of this invention fixes the phase change material through physical adsorption, and the PMHS hydrophobic layer forms a physical barrier, it exhibits good compatibility and protective effects on alkane and fatty acid phase change materials of different polarities.

[0065] In another embodiment, the weft-knitted fabric undergoes a mid-setting process after reduction cleaning and before combing.

[0066] Example 2

[0067] The difference between this embodiment 2 and embodiment 1 lies in the surface modification treatment method in steps (3) and (4), while the remaining steps are the same as in embodiment 1.

[0068] (3) Surface organic shell coating-interfacial polymerization method

[0069] ① Surface pretreatment of composite particles: 10g of the composite phase change material powder prepared in step (2) of Example 1 was weighed and dispersed in 40 mL of toluene. 3.2g of hexamethylene diisocyanate biuret (HDB-LV) was added, and the mixture was stirred at 25°C for 60 min to allow HDB-LV to be fully adsorbed onto the surface and shallow pores of the composite particles. Subsequently, toluene was removed by rotary evaporation at 40°C to obtain composite particles with HDB-LV loaded on the surface.

[0070] ② Preparation of aqueous phase: Weigh 1.8 g of ethylenediamine (EDA) and dissolve it in 150 mL of deionized water. Add 1.5 g of polyvinyl alcohol (PVA-1788) and 0.3 g of sodium dodecyl sulfate (SDS) as composite dispersion stabilizers. Stir at 25°C until the solution is homogeneous to obtain an aqueous phase mixture.

[0071] ③ Interfacial polymerization reaction: The composite particles obtained in step ① are slowly added to the aqueous phase mixture prepared in step ②, and the aqueous phase temperature is controlled at 20℃ (ice-water bath). EDA solution (the remaining 0.5 g of EDA dissolved in 30 mL of water) is slowly added dropwise at a rate of 0.5 mL / min using a peristaltic pump over 1.5 h, maintaining a constant temperature of 20℃ during this period. After the addition is complete, the temperature is slowly increased to 60℃ at a rate of 0.5℃ / min, and the reaction is continued with stirring for 3 h to form a dense polyurea shell.

[0072] ④ Post-processing: After the reaction was completed, the mixture was centrifuged (4000 r / min, 5 min). The precipitate was washed three times each with 50℃ warm water and anhydrous ethanol, and then vacuum dried at 50℃ for 12 h to obtain dual-protected microcapsules with a polyurea shell coating on the surface.

[0073] Optionally, to further improve water resistance and alkali resistance, PMHS hydrophobic treatment can be performed on the surface of the polyurea shell. The treatment method is the same as step (3) in Example 1, to construct a triple protection structure of "inorganic skeleton-polyurea shell-PMHS hydrophobic layer".

[0074] (4) Blending and granulation

[0075] The dual-protection microcapsules obtained in step (3) were melt-blended and granulated using the same low-temperature blending process as step (4) in Example 1 to obtain the "island" component masterbatch containing composite phase change material.

[0076] Following the same steps (5)-(6) as in Example 1, the final product suede fabric-2 is obtained.

[0077] Tests showed that Suede Fabric-2 exhibited the following properties: heat resistance: decomposition begins at 310℃, mass loss <1.5% at 230℃; aurora resistance: gloss change rate <9% after Martindale abrasion test; washability: phase change enthalpy retention rate greater than 93.5% after 12 household washes. Suede Fabric-2 demonstrates higher washability than Suede Fabric-1 in Example 1, making it more suitable for applications in the textile industry, including sportswear, outdoor gear, and mid-to-low-end home textiles or fast fashion, where frequent washing is required.

[0078] The triple protection of the optional scheme in Example 2 was prepared into finished suede fabric-3 using the same preparation method. Performance tests were conducted using the same method. Results: Heat resistance test of suede fabric-3: decomposition begins at 325℃, mass loss at 230℃ <1.0%; Aurora resistance: gloss change rate after Martindale abrasion test <7.5%; Washability: phase change enthalpy retention rate is greater than 94.8% after 12 household washes. The cost is higher than that of suede fabric-1 in Example 1. Suede fabric-3 has better performance and is more suitable for industrial use, special protection and other scenarios with high performance requirements.

[0079] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0080] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for preparing a composite suede fabric with temperature control and aurora protection functions, characterized in that, Includes the following steps: Step 1: Preparation of an inorganic mesoporous silica framework; Step 2 involves loading the phase change material into the channels of the skeleton described in Step 1 using a vacuum impregnation method to obtain the composite phase change material. Step 3 involves surface modification of the composite phase change material obtained in Step 2 to form an encapsulation layer, thereby obtaining a surface-modified composite phase change material. Step four involves blending and granulating the surface-modified composite phase change material from step three with polyethylene terephthalate to obtain an "island" component masterbatch containing the composite phase change material. Step 5 employs an island-sea composite spinning process, using the "island" component masterbatch containing composite phase change material described in Step 4 as the island component and the alkali-soluble copolyester as the "sea" component. Spinning is performed through a spinneret, which has multiple functional units. Each functional unit contains at least two different types of spinneret holes with irregular cross-sections, arranged in a predetermined order. Step six involves weaving the island fibers into a greige fabric, followed by finishing processes to obtain a composite suede fabric. The finishing processes include at least alkali reduction fiber opening, napping, dyeing, and setting processes. The order and specific parameters of each process are adjusted according to conventional processes.

2. The method for preparing the composite structure suede as described in claim 1, characterized in that, The inorganic mesoporous silica framework in step one is prepared by hydrothermal synthesis. Using hexadecyltrimethylammonium bromide as a template, the template is removed by calcination to obtain a mesoporous framework with a pore size of 6-8 nm.

3. The method for preparing the composite structure suede as described in claim 2, characterized in that, in, The hexadecyltrimethylammonium bromide template agent can be replaced with at least one of the shea butter-derived cationic surfactant SBATC or Gemini quaternary ammonium salt surfactants.

4. The method for preparing the composite structure suede as described in claim 1, characterized in that, The surface modification treatment in step three specifically involves: in the presence of a catalyst, cross-linking and coating the composite phase change material with a hydrophobic material to form a hydrophobic layer. The catalyst is selected from at least one of bismuth-zirconium bimetallic catalysts, zinc-zirconium composite catalysts, organotitanium catalysts, or organocerium catalysts; the hydrophobic material is selected from at least one of polymethylhydrosiloxane, vinyl-terminated polydimethylsiloxane, capsaicin-modified polymethylhydrosiloxane, or hydroxyl-containing organosilicon oil.

5. The method for preparing the composite structure suede as described in claim 1, characterized in that, The surface modification treatment described in step three is as follows: first, a polyurea shell is formed on the surface of the composite phase change material by interfacial polymerization, and then the surface of the polyurea shell is hydrophobically treated with polymethylhydrosiloxane.

6. The method for preparing the composite structure suede as described in claim 1, characterized in that, The spinneret cross-sectional shape in step five includes at least two of the following: a first type of cross-section, a second type of cross-section, and a third type of cross-section; wherein, the first type of cross-section is multi-leaf-shaped or irregular, the second type of cross-section is flat, cross-shaped, or H-shaped, and the third type of cross-section is sharp-edged.

7. The method for preparing the composite structure suede as described in claim 6, characterized in that, The multi-leaf shape mentioned in step five is a four-leaf or three-leaf shape, and the sharp-angled shape is a Y-shape or a triangle.

8. The method for preparing the composite structure suede as described in claim 1, characterized in that, The content of the composite phase change material in the "island" component masterbatch in step three is 9-13%.

9. The method for preparing the composite structure suede as described in claim 1, characterized in that, The phase change material mentioned in step one is an alkane, a fatty acid, or a mixture of both, with a phase change temperature range of 18-32℃.

10. A composite suede fabric, made by the preparation method of any one of claims 1 to 9, characterized in that, The suede, after undergoing a Martindale abrasion test, showed a gloss change rate of less than 9%.

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