Heat storage and preservation fabric and preparation method thereof

Abstract

The invention discloses a heat storage and preservation fabric and a preparation method thereof, and relates to the technical field of textile. The preparation method of the fabric comprises the following steps: blending modified polyester fibers, viscose fibers and Thermomolite fibers to form warps; the spandex fibers, the viscose fibers and the Thermomolite fibers are blended to form wefts; the warp and the weft are placed in a weaving machine to be woven, and the heat storage and heat preservation fabric is obtained, by means of functional modification inside the fibers and scientific blending of multiple components, the double heat preservation effects of active heat storage and passive heat insulation are achieved, the prepared fabric integrates the functions of lightness, thinness, heat preservation, moisture absorption, quick drying, antibiosis, deodorization and static electricity resistance, it is ensured that the function is durable and stable through chemical bonding, and warm and comfortable wearing experience is provided for a user.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to a heat-retaining and heat-insulating fabric and its preparation method. Background Technology

[0002] As consumers increasingly demand higher functionality from textiles, multifunctional integrated textile materials have become an important direction for industry development. Modern textiles not only need to possess basic heat insulation properties, but also require multiple functions such as antibacterial and deodorizing properties, moisture absorption and quick-drying properties, and antistatic properties to meet the needs of healthy and comfortable wear.

[0003] Polyester fiber, as one of the most widely used synthetic fibers, boasts advantages such as high strength, good abrasion resistance, and excellent dimensional stability, occupying an important position in the textile industry. However, traditional polyester fibers have significant functional defects: their thermal insulation performance is generally poor, relying mainly on passive insulation through air layers between fibers; their moisture absorption is poor, easily causing a stuffy feeling; they lack antibacterial properties, leading to odors after prolonged wear; and they are prone to static electricity, affecting wearing comfort. These defects limit the application of polyester fibers in high-end functional textiles.

[0004] Thermolite fiber is a hollow insulating fiber developed by DuPont. Its unique four-hole hollow structure effectively traps air, providing lightweight insulation and making it widely used in outdoor sportswear and thermal underwear. However, Thermolite fiber has relatively limited functionality, primarily focusing on thermal insulation, and lacks other functional properties such as antibacterial and moisture-wicking properties, making it difficult to meet the comprehensive needs of modern multifunctional textiles.

[0005] To endow textiles with multiple functional properties, researchers have attempted to add various functional nanomaterials to fibers. Nano-titanium dioxide has attracted attention due to its good chemical stability and photocatalytic antibacterial properties, but it faces key technical challenges in practical applications: nanoparticles tend to agglomerate in polymer matrices, resulting in poor dispersibility; they have limited functionality, lacking properties such as heat storage, moisture absorption, and electrical conductivity; and they have weak bonding with the matrix, leading to poor functional durability.

[0006] Furthermore, existing functional fiber preparation methods mostly employ simple physical mixing or single-function modification, making it difficult to achieve synergistic multi-functionality. In fabric design, a systematic solution is still lacking for how to achieve the organic unity of multiple functions such as heat insulation, comfort, and antibacterial properties through the scientific proportioning of multi-component fibers and optimization of fabric structure. In particular, how to endow fibers with multiple functional properties through chemical modification techniques while maintaining their original excellent physical and mechanical properties is a current technological bottleneck that urgently needs to be overcome.

[0007] Therefore, there is an urgent need to develop a systematic fiber functionalization technology that can solve the problems of dispersion and single function by precisely modifying functional additives through multiple steps, and combine it with scientific multi-component fiber blending design to prepare high-performance multifunctional textile materials that integrate heat preservation, antibacterial, moisture absorption and quick drying, and antistatic properties. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a heat-storing and heat-insulating fabric and its preparation method. The present invention achieves dual heat-storing effects of active heat storage and passive heat insulation through internal fiber functionalization modification and multi-component scientific blending. The resulting fabric integrates lightweight warmth, moisture absorption and quick drying, antibacterial and deodorizing properties, and antistatic properties. Through chemical bonding, it ensures long-lasting and stable functionality, providing users with a warm and comfortable wearing experience.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing a heat-retaining and heat-insulating fabric includes the following steps: blending modified polyester fiber, viscose fiber, and Thermolite fiber to form warp yarn; blending spandex fiber, viscose fiber, and Thermolite fiber to form weft yarn; placing the warp and weft yarns on a weaving machine for weaving to obtain the heat-retaining and heat-insulating fabric; the method for preparing the modified polyester fiber includes the following steps: mixing and melting modified porous nano-titanium dioxide and polyester chips to obtain modified polyester chips, then melt-spinning them to obtain modified polyester FDY yarn, and subsequently obtaining modified polyester fiber through a DTY process.

[0010] Preferably, the modified porous nano-titanium dioxide is prepared by the following method: (1) Disperse porous nano-titanium dioxide in ethanol / water solvent, then add acetic acid and KH550, reflux reaction under nitrogen atmosphere, filter, wash and dry the product to obtain pretreated titanium dioxide; Silane coupling: Under acidic conditions, KH550 first undergoes a hydrolysis reaction, where three ethoxy groups are progressively replaced by hydroxyl groups to form silanols (Si-OH). Subsequently, the silanols undergo a dehydration condensation reaction with the hydroxyl groups (Ti-OH) on the surface of titanium dioxide, forming stable Ti-O-Si covalent bonds, successfully grafting aminopropyl groups onto the TiO2 surface. Acetic acid catalysts promote the silane hydrolysis and condensation process, while a nitrogen atmosphere prevents side reactions.

[0011] Preferably, in step (1), the porous nano-titanium dioxide has a particle size ≤100nm, a porosity of 5~8%, and a pore size ≤10nm.

[0012] Preferably, in step (1), the ratio of porous nano-titanium dioxide, ethanol / water solvent, acetic acid, and KH550 is 10g: 150~300mL: 0.2~0.5mL: 1~4mL; and the volume ratio of ethanol and deionized water in the ethanol / water solvent is 100: 0.2~0.5.

[0013] Preferably, in step (1), the reflux reaction conditions are reflux reaction at 50~65℃ for 4~7h.

[0014] (2) Disperse the pretreated titanium dioxide in a DMF / ethanol mixed solvent, sonicate it, then add 4-aldehyde imidazole, stir the reaction, centrifuge, wash and dry the product to obtain functionalized titanium dioxide; Schiff base formation: The amino group (-NH2) on the pretreated titanium dioxide surface undergoes a nucleophilic addition reaction with the aldehyde group (-CHO) of 4-aldehyde imidazole, first forming an amino alcohol intermediate, which is then dehydrated to generate a Schiff base structure containing C=N double bonds, thus successfully introducing the imidazole ring into the TiO2 surface.

[0015] Preferably, in step (2), the ratio of pretreated titanium dioxide, DMF / ethanol mixed solvent, and 4-aldehyde imidazole is 10g: 200~300mL: 1~4g; the volume ratio of DMF to ethanol in the DMF / ethanol mixed solvent is 2~3:1.

[0016] Preferably, in step (2), the ultrasonic treatment is performed for 20-40 min; the stirring reaction is carried out at 40-70℃ for 8-14 h; and the product is washed with DMF and ethanol in sequence until the filtrate is colorless.

[0017] (3) Functionalized titanium dioxide was dispersed in DMF, ultrasonically treated, triethylamine was added, followed by 1,3-propanesulfonyl lactone. The reaction was carried out under nitrogen atmosphere and stirred in the dark. The product was centrifuged, washed and dried to obtain modified porous nano titanium dioxide.

[0018] Ring-opening alkylation of sulfonyl lactones: The nitrogen atom on the imidazole ring acts as a nucleophile, attacking the β-carbon atom of 1,3-propanesulfonyl lactone, leading to ring-opening of the five-membered sulfonyl lactone ring and forming an alkylated imidazole cation containing a sulfonic acid group. Triethylamine acts as an acid-binding agent to neutralize the protons generated in the reaction, preventing the imidazole from being protonated, while maintaining the basic environment of the reaction system, promoting the nucleophilic substitution reaction, and ultimately yielding a zwitterionic functional group containing both an imidazole cation and a sulfonic acid anion.

[0019] Preferably, in step (3), the ratio of functionalized titanium dioxide, DMF, triethylamine, and 1,3-propanesulfonyl lactone is 10g: 200~300mL: 1.5~3mL: 0.8~3.2g.

[0020] Preferably, in step (3), the ultrasonic treatment is performed for 20 to 40 minutes; the stirring reaction conditions are 35 to 50°C for 8 to 16 hours.

[0021] Preferably, the blending ratio of modified polyester fiber, viscose fiber, and Thermolite fiber is 45:30:25; the blending ratio of spandex fiber, viscose fiber, and Thermolite fiber is 45:30:25; and the mass ratio of modified porous nano-titanium dioxide and polyester chips is 3~9:100.

[0022] The present invention also claims a heat-retaining and heat-insulating fabric prepared using the aforementioned preparation method.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. The heat-retaining and insulating fabric of this invention achieves excellent heat-retention performance through the synergistic effect of multiple components: Modified polyester fiber, as the main warp, has modified porous nano-titanium dioxide inside that can effectively absorb, store, and slowly release body heat, providing a continuous heat-retaining and insulating effect. Simultaneously, its porous structure forms a microcapillary network that can quickly transfer moisture, achieving excellent moisture-wicking and quick-drying functions. Viscose fiber has good moisture-wicking properties and a soft feel, ensuring the fabric's comfort and breathability. Thermolite fiber, with its hollow structure design, can effectively block cold air and lock in body heat, forming a double heat-retaining barrier with the modified polyester fiber. Spandex fiber gives the fabric excellent elasticity and extensibility, improving wearing comfort and freedom of movement. Through the design of different fiber ratios in the warp and weft directions, the fabric maintains its lightweight characteristics while possessing excellent heat-retaining and insulating performance.

[0024] 2. This invention provides a modified porous nano-titanium dioxide, achieving multiple synergistic effects through a three-step functionalization modification: The first step introduces aminopropyl groups, which, through covalent bonding, effectively solve the aggregation problem caused by the high specific surface area of ​​nanoparticles, significantly improving their uniform dispersion and interfacial bonding strength in the polyester matrix, while also providing active reaction sites for subsequent functionalization. The second step grafts imidazole groups, which not only introduce a heterocyclic structure with good thermal stability for heat capture and storage, but also have their own antibacterial activity synergistically enhanced with the photocatalytic bactericidal effect of nano-titanium dioxide, significantly improving the fabric's antibacterial and deodorizing properties. The third step introduces sulfonic acid groups with strong hydrophilic properties, enabling rapid absorption and transfer of sweat to the fabric surface for rapid evaporation. This, combined with the capillary effect of the porous carrier, forms a highly efficient moisture-wicking and quick-drying system. Simultaneously, its ionization properties endow the fabric with excellent antistatic properties, effectively preventing static electricity accumulation and discomfort. The functional groups fixed through chemical bonding ensure excellent washability and durability, allowing the fabric to maintain stable heat retention, antibacterial and deodorizing, moisture-wicking and quick-drying, and antistatic properties over a long period. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0026] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

[0027] Polyester chips were purchased from Dongguan Plastic Raw Materials Co., Ltd., grade CR-8863 / YS-Y01; Thermolite fiber features a biomimetic hollow tubular structure with a hollowness of 85% and a dense microporous structure on its surface.

[0028] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) Disperse 10g of porous nano-titanium dioxide into 150~300mL of ethanol / water solvent (the volume ratio of ethanol to deionized water is 100:0.2~0.5), then add 0.2~0.5mL of acetic acid and 1~4mL of KH550, and reflux the reaction at 50~65℃ under a nitrogen atmosphere for 4~7h. Filter, wash and dry the product to obtain pretreated titanium dioxide; (2) Disperse 10g of pretreated titanium dioxide into 200~300mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2~3:1), sonicate for 20~40min, then add 1~4g of 4-aldehyde imidazole, stir and react at 40~70℃ for 8~14h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Disperse 10g of functionalized titanium dioxide into 200-300mL of DMF, sonicate for 20-40min, add 1.5-3mL of triethylamine, and then add 0.8-3.2g of 1,3-propanesulfonyl lactone. Stir and react at 35-50℃ in a nitrogen atmosphere in the dark for 8-16h. Centrifuge, wash and dry the product to obtain modified porous nano titanium dioxide. (4) Mix and melt 3-9 parts of modified porous nano titanium dioxide and 100 parts of polyester chips to obtain modified polyester chips, which are then melt-spun to obtain modified polyester FDY yarn, and then processed by DTY process to obtain modified polyester fiber. (5) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0029] The present invention will be further described below through specific embodiments.

[0030] Example 1

[0031] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.5mL of acetic acid and 4mL of KH550 were added. The mixture was refluxed at 65℃ under a nitrogen atmosphere for 4h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Disperse 10g of pretreated titanium dioxide into 250mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2:1), sonicate for 30min, then add 4g of 4-aldehyde imidazole, stir at 70℃ for 8h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Disperse 10g of functionalized titanium dioxide into 250mL of DMF, sonicate for 30min, add 3mL of triethylamine, then add 3.2g of 1,3-propanesulfonyl lactone, stir and react for 8h in a nitrogen atmosphere at 50℃ in the dark, centrifuge, wash and dry the product to obtain modified porous nano titanium dioxide. (4) After mixing and melting 900g of modified porous nano titanium dioxide and 10000g of polyester chips, the chips are obtained as modified polyester chips. Modified polyester FDY yarn is obtained by melt spinning, and then modified polyester fiber is obtained by DTY process. (5) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0032] Example 2

[0033] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.4mL of acetic acid and 3mL of KH550 were added. The mixture was refluxed at 60℃ under a nitrogen atmosphere for 5h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Disperse 10g of pretreated titanium dioxide into 250mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2:1), sonicate for 30min, then add 3g of 4-aldehyde imidazole, stir and react at 60℃ for 10h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Disperse 10g of functionalized titanium dioxide into 250mL of DMF, sonicate for 30min, add 2.5mL of triethylamine, then add 2.4g of 1,3-propanesulfonyl lactone, stir and react for 10h in a nitrogen atmosphere at 45℃ in the dark, centrifuge, wash and dry the product to obtain modified porous nano titanium dioxide. (4) 700g of modified porous nano titanium dioxide and 10000g of polyester chips are mixed and melted to obtain modified polyester chips. Modified polyester FDY yarn is obtained by melt spinning and then modified polyester fiber is obtained by DTY process. (5) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0034] Example 3

[0035] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.3mL of acetic acid and 2mL of KH550 were added. The mixture was refluxed at 55℃ under a nitrogen atmosphere for 6h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Disperse 10g of pretreated titanium dioxide into 250mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2:1), sonicate for 30min, then add 2g of 4-aldehyde imidazole, stir at 50℃ for 12h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Disperse 10g of functionalized titanium dioxide into 250mL of DMF, sonicate for 30min, add 2mL of triethylamine, then add 1.6g of 1,3-propanesulfonyl lactone, stir and react for 14h in a nitrogen atmosphere at 40℃ in the dark, centrifuge, wash and dry the product to obtain modified porous nano titanium dioxide. (4) Mix and melt 500g of modified porous nano titanium dioxide and 10000g of polyester chips to obtain modified polyester chips, which are then melt-spun to obtain modified polyester FDY yarn, and subsequently processed by DTY process to obtain modified polyester fiber. (5) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0036] Example 4

[0037] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.2mL of acetic acid and 1mL of KH550 were added. The mixture was refluxed at 50℃ under a nitrogen atmosphere for 7h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Disperse 10g of pretreated titanium dioxide into 250mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2:1), sonicate for 30min, then add 1g of 4-aldehyde imidazole, stir at 40℃ for 14h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Disperse 10g of functionalized titanium dioxide into 250mL of DMF, sonicate for 30min, add 1.5mL of triethylamine, then add 0.8g of 1,3-propanesulfonyl lactone, stir and react for 16h in a nitrogen atmosphere at 35℃ in the dark, centrifuge, wash and dry the product to obtain modified porous nano titanium dioxide. (4) Mix and melt 300g of modified porous nano titanium dioxide and 10000g of polyester chips to obtain modified polyester chips, which are then melt-spun to obtain modified polyester FDY yarn, and subsequently processed by DTY process to obtain modified polyester fiber. (5) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0038] Comparative Example 1

[0039] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.5mL of acetic acid and 4mL of KH550 were added. The mixture was refluxed at 65℃ under a nitrogen atmosphere for 4h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Disperse 10g of pretreated titanium dioxide into 250mL of DMF / ethanol mixed solvent (the volume ratio of DMF to ethanol is 2:1), sonicate for 30min, then add 4g of 4-aldehyde imidazole, stir at 70℃ for 8h, centrifuge the product, wash with DMF and ethanol in sequence until the filtrate is colorless, dry, and obtain functionalized titanium dioxide; (3) Mix and melt 800g of functionalized titanium dioxide, 100g of 1,3-propane sulfonyl lactone and 10000g of polyester chips, and obtain modified polyester chips. Then, obtain modified polyester FDY yarn through melt spinning, and then obtain modified polyester fiber through DTY process. (4) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0040] Comparative Example 2

[0041] A method for preparing a heat-storing and heat-insulating fabric includes the following steps: (1) 10g of porous nano-titanium dioxide was dispersed in 200mL of ethanol / water solvent (the volume ratio of ethanol to deionized water was 100:0.3), and then 0.5mL of acetic acid and 4mL of KH550 were added. The mixture was refluxed at 65℃ under a nitrogen atmosphere for 4h. The product was filtered, washed and dried to obtain pretreated titanium dioxide. (2) Mix and melt 800g of pretreated titanium dioxide, 100g of 4-aldehyde imidazole and 10000g of polyester chips, and obtain modified polyester chips. Then, obtain modified polyester FDY yarn through melt spinning, and then obtain modified polyester fiber through DTY process. (3) The modified polyester fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the warp; the spandex fiber, viscose fiber and Thermolite fiber are blended in a ratio of 45:30:25 to form the weft; the warp and weft are placed in a weaving machine to weave the heat-storing and heat-insulating fabric.

[0042] Referring to the simplified washing conditions and procedures of FZ / T73023-2006 "Antibacterial Knitted Fabrics", the standard detergent concentration used was 2g / L. The fabrics obtained in Example 1 and Comparative Examples 1-2 were washed in a constant temperature shaking water bath at 40℃ for 5 minutes. After washing, they were rinsed with distilled water. This process was considered as one wash. Following the above procedure, the heat-retaining and heat-insulating fabric was washed 100 times to test the antibacterial properties of the fabric before and after washing.

[0043] The antimicrobial properties of the fabric were tested according to the specifications in GB / T 20944.3-2008 "Evaluation of Antimicrobial Properties of Textiles - Part 3: Vibration Method". *Escherichia coli* ATCC 8099, *Candida albicans* ATCC 10231, and *Staphylococcus aureus* ATCC 6538 were used as test strains. Under aseptic conditions, appropriate amounts of the three strains were added to 20 mL of sterilized broth to prepare a solution of 3 × 10⁻⁶ micrograms per cubic meter. 5 For each fabric sample obtained in Example 1 and Comparative Examples 1-2, 4g of bacterial culture medium containing cfu / mL was weighed and cut into approximately 5×5mm pieces. The samples were then placed in the corresponding bacterial culture medium. A bacterial culture medium without the sample was used as a control group. The broth was placed in a constant temperature shaker at 37℃ and 150r / min for 24 hours. 100μL of the culture was spread onto an agar plate. After 4 hours of incubation, the bacterial count on the plate was recorded using the plate count method. Three tests were conducted for each sample, and the average value was taken. The test results are shown in Table 1. The antibacterial activity of the fabric can be calculated using the following formula: R = (BA) / B × 100%; where R represents the antibacterial rate, and A and B are the bacterial concentrations of the sample and control group, respectively. The test results are shown in Table 1.

[0044] Table 1. Test results of antibacterial properties of heat-storing and heat-insulating fabrics

[0045] The volume resistivity of the heat-retaining fabric was tested according to GB / T 12703.4-2010 "Evaluation of electrostatic properties of textiles - Part 4: Resistivity" to characterize its antistatic properties. The wicking height, moisture permeability, and drying rate of the heat-retaining fabrics obtained in Example 1 and Comparative Examples 1-2 were tested according to GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single-item combination test method". The washing process was conducted according to GB / T 8629-2017 "Home washing and drying procedures for textile testing", using a Type A standard washing machine and an Type A1 tumble dryer, with cotton-type linens and standard detergent 2,4N added. Each sample was tested four times to comprehensively evaluate the fabric's moisture absorption and wicking properties. The heat retention rate was tested according to GB / T 35762-2017 "Test methods for heat transfer properties of textiles - Plate method". The test results are shown in Table 2.

[0046] Table 2. Test results of antistatic and thermal insulation performance of heat-storing and heat-insulating fabrics

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a heat-storing and heat-insulating fabric, characterized in that, The process includes the following steps: blending modified polyester fiber, viscose fiber, and Thermolite fiber to form warp yarn; blending spandex fiber, viscose fiber, and Thermolite fiber to form weft yarn; placing the warp and weft yarns on a weaving machine to weave the heat-retaining and heat-insulating fabric; the preparation method of the modified polyester fiber includes the following steps: mixing and melting modified porous nano-titanium dioxide and polyester chips to obtain modified polyester chips, then melt-spinning them to obtain modified polyester FDY yarn, and finally obtaining modified polyester fiber through DTY process.

2. The preparation method according to claim 1, characterized in that, The modified porous nano-titanium dioxide was prepared by the following method: (1) Disperse porous nano-titanium dioxide in ethanol / water solvent, then add acetic acid and KH550, reflux reaction under nitrogen atmosphere, filter, wash and dry the product to obtain pretreated titanium dioxide; (2) Disperse the pretreated titanium dioxide in a DMF / ethanol mixed solvent, sonicate it, then add 4-aldehyde imidazole, stir the reaction, centrifuge, wash and dry the product to obtain functionalized titanium dioxide; (3) Functionalized titanium dioxide was dispersed in DMF, ultrasonically treated, triethylamine was added, followed by 1,3-propanesulfonyl lactone. The reaction was carried out under nitrogen atmosphere and stirred in the dark. The product was centrifuged, washed and dried to obtain modified porous nano titanium dioxide.

3. The preparation method according to claim 2, characterized in that, In step (1), the ratio of porous nano-titanium dioxide, ethanol / water solvent, acetic acid, and KH550 is 10g: 150~300mL: 0.2~0.5mL: 1~4mL; the volume ratio of ethanol and deionized water in the ethanol / water solvent is 100: 0.2~0.

5.

4. The preparation method according to claim 2, characterized in that, In step (1), the reflux reaction conditions are reflux reaction at 50~65℃ for 4~7h.

5. The preparation method according to claim 2, characterized in that, In step (2), the ratio of pretreated titanium dioxide, DMF / ethanol mixed solvent, and 4-aldehyde imidazole is 10g: 200~300mL: 1~4g; the volume ratio of DMF to ethanol in the DMF / ethanol mixed solvent is 2~3:

1.

6. The preparation method according to claim 2, characterized in that, In step (2), the ultrasonic treatment lasts for 20-40 minutes; the stirring reaction is carried out at 40-70°C for 8-14 hours; the product is washed with DMF and ethanol in sequence until the filtrate is colorless.

7. The preparation method according to claim 2, characterized in that, In step (3), the ratio of functionalized titanium dioxide, DMF, triethylamine and 1,3-propanesulfonyl lactone is 10g: 200~300mL: 1.5~3mL: 0.8~3.2g.

8. The preparation method according to claim 2, characterized in that, In step (3), the ultrasonic treatment lasts for 20 to 40 minutes; the stirring reaction conditions are 35 to 50°C for 8 to 16 hours.

9. The preparation method according to claim 1, characterized in that, The blending ratio of modified polyester fiber, viscose fiber, and Thermolite fiber is 45:30:25; the blending ratio of spandex fiber, viscose fiber, and Thermolite fiber is 45:30:25; and the mass ratio of modified porous nano-titanium dioxide and polyester chips is 3~9:

100.

10. A heat-retaining and heat-insulating fabric prepared by the preparation method according to any one of claims 1 to 9.

Images