Breathable and refreshing school uniform fabric and school uniform

Abstract

The invention discloses a breathable and refreshing type school uniform fabric and a school uniform, and particularly relates to the technical field of garment fabrics, the breathable and refreshing type school uniform fabric comprises a substrate layer and a surface layer, the substrate layer is composed of functional fibers formed by compounding matrix fibers and shell-core microspheres, the shell-core microspheres take hydrogel as cores and hierarchical porous cellulose acetate microspheres as shells, and the surface layer is formed by compounding the matrix fibers and the shell-core microspheres. The particle size of the hierarchical porous cellulose acetate microspheres is 5-30 [mu] m, the hierarchical porous cellulose acetate microspheres have at least three levels of pores, the precursor solution of the hydrogel and the hierarchical porous cellulose acetate microspheres are stirred and mixed, then an intermediate is prepared through a circulating temperature change method, then a cross-linking agent is added, and the hydrogel-hierarchical porous cellulose acetate shell-core microspheres are prepared; the functional fiber is prepared through low-temperature spinning or low-temperature tie-dyeing to achieve compounding of shell-core microspheres, the substrate layer has the functions of water absorption, water loss and sunlight scattering and improves the wearing body feeling in the summer high-temperature period, and the hierarchical porous cellulose acetate microspheres provide stress constraint and mechanical protection and guarantee the functional life of the hydrogel.

Description

Technical Field

[0001] The invention relates to the technical field of clothing fabrics, and in particular to a breathable and refreshing school uniform fabric and a school uniform. Background Art

[0002] In the field of education, school uniforms, as an important part of campus culture, not only carry the history and tradition of the school, but also affect students' daily wearing experience and self-identity. In recent years, with the development of the times and the changes in social aesthetic concepts, school uniform design has gradually changed from a single standardization to a dual combination of functionality and aesthetics, becoming a new carrier for educational innovation and student personality expression. However, school uniform design often focuses on uniformity and standardization, while ignoring the actual needs of students in different seasons and different activities, especially the functional needs of summer school uniforms for breathability and refreshing. In reality, the production method of functional textile fabrics is still relatively primitive, or the production cost is very high, or the production conditions are required to be high, resulting in limited production and application of functional fabrics. Existing fabrics are generally made of chemical fiber fabrics, which are easy to volatilize moisture, heavy in weight, not refreshing, sweat-absorbent and breathable, and easily cause allergies to sensitive physiques. Static electricity is also easily generated in a dry environment, which is not conducive to physical health. Therefore, there is a need for clothes made of refreshing and breathable textile fabrics on the market to meet people's life needs. Summary of the invention

[0003] The main purpose of the present invention is to provide a breathable and refreshing school uniform fabric and school uniform, which provides excellent air permeability and moisture permeability, is not stuffy, and is antibacterial, quick-drying, skin-friendly, durable, refreshing and comfortable, and can effectively improve the comfort and experience of wearing school uniforms.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A breathable and refreshing school uniform fabric comprises a substrate layer and a surface layer. The substrate layer is prepared from matrix fiber low-temperature composite core-shell microspheres. The core-shell microspheres have hydrogels as cores and multi-level porous cellulose acetate microspheres as shells.

[0005] Preferably, the multi-level porous cellulose acetate microspheres have a particle size of 5 to 30 μm and a pore size of at least 3 levels.

[0006] More preferably, the pore sizes of the three levels of pores are respectively 15-30%, 4-8%, and 1-2% of the particle size of the multi-level porous cellulose acetate microspheres.

[0007] Preferably, the precursor solution of the hydrogel and the multi-level porous cellulose acetate microspheres are fully stirred and mixed, and then an intermediate is prepared by a cyclic temperature change method. The intermediate is fused with a cross-linking agent to form a hydrogel@multi-level porous cellulose acetate microspheres.

[0008] More preferably, the cyclic temperature change method is a cyclic freezing method or a cyclic heating method.

[0009] More preferably, the high and low point temperatures of the cyclic freezing method are 25°C and -25°C, the high temperature point is naturally thawed, the low temperature point is frozen for 1 to 2 hours, and the number of cycles is 3 to 5 times.

[0010] More preferably, the high and low temperature points of the cyclic heating method are 60°C and 20°C, the high and low temperature points are kept for 30 minutes, and the number of cycles is 3 to 5 times.

[0011] Preferably, the multi-level porous cellulose acetate microspheres are prepared by an emulsion drying method using cellulose acetate, a solvent, and an emulsifier in a mass ratio of 1 to 1.5:45 to 55:0.8 to 1.2.

[0012] More preferably, the degree of substitution of the cellulose acetate is between 2.3 and 2.8, the dissolving agent is one or more of dichloromethane and acetone, and the emulsifier is one or more of polyvinyl alcohol, SPAN80, and sodium dodecyl sulfate.

[0013] Preferably, the matrix fiber low-temperature composite core-shell microspheres are prepared by low-temperature spinning and embedding.

[0014] More preferably, the preparation method of low-temperature spinning embedding comprises the following steps: F1: Weigh 2-4 parts of core-shell microspheres and disperse them in 45-55 parts of a composite spinning solvent of dichloromethane and acetone, with the mass ratio of acetone to dichloromethane being 1:5; F2: Then 10 to 15 parts of cellulose acetate are added to the solution in three portions, and stirred at room temperature until the cellulose acetate is completely dissolved to prepare a spinning solution; F3: The spinning solution is spun at a spinning pressure of 3 to 4 Bar, and the spun yarn is obtained after cooling, and then the spun yarn is stretched at a stretching speed of 80 to 100 r / min and 20° C., and the acetate fiber is obtained after the solvent evaporates. The acetate fiber is woven alone or with other fibers in warp and weft to prepare the substrate fabric.

[0015] More preferably, in the low-temperature spinning embedding preparation method, the diameter of the core-shell microspheres is smaller than the diameter of the matrix fibers.

[0016] More preferably, the other fibers are one or more of polyester fibers, nylon fibers, acrylic fibers, chloroprene fibers, vinylon fibers, spandex fibers, and polyolefin fibers.

[0017] Preferably, the matrix fiber low-temperature composite core-shell microspheres are prepared by low-temperature tie-dyeing adhesion.

[0018] More preferably, the preparation method of the low-temperature tie-dye adhesion comprises the following steps: Z1: add 6-8%wt core-shell microspheres, 0.5-0.8%wt surfactant, and 1.5-2%wt cross-linking agent in 1L water, and soak the natural fiber grey cloth under the bath ratio of 1:14-18 to form a primary tie-dyed cloth; Z2: Add 3.5-4.5%wt core-shell microspheres, 0.5-0.8%wt surfactant, and 1-1.5%wt cross-linking agent into 1L water, and soak the tie-dyed cloth in step Z1 under a bath ratio of 1:20-25 to form a secondary tie-dyed cloth, dehydrate and dry to prepare a functional substrate fabric.

[0019] More preferably, the natural fiber grey cloth is composed of one or more of cotton fiber, hemp fiber, wood fiber, bamboo fiber, chitin fiber, chitosan fiber, and cellulose acetate fiber.

[0020] Preferably, the hydrogel is prepared using natural polymer raw materials.

[0021] Preferably, the natural polymer raw material is one or more of collagen, gelatin, hyaluronic acid, chitosan, hyaluronic acid, fibrin, alginate, cellulose, agarose, dextran, guar gum, and protein.

[0022] More preferably, the natural polymer raw material is one of sodium alginate, chitosan and cellulose.

[0023] Preferably, the multi-level porous cellulose acetate microspheres are doped with conductive materials.

[0024] More preferably, the conductive material is composed of one or more of carbon nanotubes, graphene, and nanosilver particles.

[0025] More preferably, the amount of the conductive material is 15-25%wt of the multi-level porous cellulose acetate microspheres.

[0026] The present invention also provides a school uniform, which is made of the breathable and refreshing school uniform fabric.

[0027] Compared with the prior art, the present invention has the following beneficial effects: 1. By introducing the shell-core microspheres of hydrogel@multi-level porous cellulose acetate microspheres as functional water absorption and water loss additives, the hydrogel accelerates the absorption of sweat in high temperatures in summer, and the multi-level porous cellulose acetate microspheres have mechanical protection and siphon water absorption functions. The composite structure is conducive to reducing the warp and weft textile density of the substrate layer and improving air permeability while ensuring freshness.

[0028] 2. Multi-level porous hydrogel @ The shell-core microspheres of multi-level porous cellulose acetate microspheres also have a photothermal conversion effect. The multi-level porous cellulose acetate absorbs ultraviolet and infrared light, and the multi-level porous hydrogel scatters and reflects light, which reduces the radiant heat penetration rate of sunlight. At the same time, it is beneficial to the temperature rise of the hydrogel core, improves the evaporation of water, and is beneficial to the refreshing sensory enhancement of outdoor activities.

[0029] 3. Antistatic materials are easily attached to multi-level porous cellulose acetate microspheres, thereby avoiding excessive production of static electricity, reducing problems such as increased blood pH, decreased calcium content in the blood, increased calcium content in urine, increased blood sugar, and decreased vitamin C content caused by static electricity. Static electricity also causes dust adsorption and accumulation, seriously affecting the appearance and sales of fabric products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the electron microscope structure of the multi-level porous cellulose acetate microspheres of the present invention; Figure 2 It is a schematic cross-sectional electron microscope diagram of the multi-level porous cellulose acetate microsphere of the present invention; Figure 3 This is a schematic electron microscope diagram of the hydrogel@multi-level porous cellulose acetate microspheres prepared in Example 1 of the present invention; Figure 4 This is a schematic electron microscope diagram of the hydrogel@multi-level porous cellulose acetate microspheres of Example 2 of the present invention; Figure 5 Schematic diagram of dyeing adsorption efficiency of core-shell microspheres prepared according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] In the embodiment of the present invention, multi-level porous cellulose acetate microspheres are prepared by emulsion drying method to obtain a concentrated particle size distribution (5-30 μm) and a specific surface area of ​​more than 100 m 2 / g, the pore volume of the product exceeds 4mL / g, the specific preparation steps are: Q1: 1.5 parts of cellulose acetate was added to 50 parts of dichloromethane solution and stirred at 5°C for 2 hours to form solution A; Q2: Add 0.75 parts of Span80 to solution A and continue stirring for 15 minutes to form solution B; Q3: Solution B was dropped into 100 parts of deionized water solution containing 0.2 parts of sodium dodecylbenzene sulfonate, stirred continuously at 450 rpm for 4 hours in a 40°C water bath, and then washed and dried to obtain multi-level porous cellulose acetate microspheres.

[0033] In the pre-preparation, the particle size of the prepared multi-level porous cellulose acetate microspheres can also be changed by controlling the amount of cellulose acetate added. When the amount added is 1.2 to 1.8 parts, the particle size distribution is 5 to 30 um. Figure 1 Schematic diagram of electron microscope of multi-level porous cellulose acetate microspheres of the present invention, from which the pore size distribution can be seen. Figure 2 This is the cut surface of the multi-level porous cellulose acetate microsphere of the present invention. It can be seen that the multi-level pores are also distributed in the sphere. The results of the specific surface area and pore size analyzer show that the specific surface area and pore volume of the 10μm microsphere are 105.3m 2 / g and 4.5cm 3 / g, the properties of high voids and pore volume are used to meet the skeleton performance standards of the hydrogel core.

[0034] In this embodiment, the multi-level porous cellulose acetate microspheres prepared in advance can also be doped with antistatic materials. The specific preparation steps are as follows: J1: 0.2 parts of cellulose acetate was added to 50 parts of dichloromethane to form solution C; J2: 0.05 parts of carbon nanotubes and 1.5 parts of sodium lignin sulfonate were dissolved in 20 parts of N,N-dimethylformamide to form solution D; J3: Solution C and solution D were mixed in a volume ratio of 9:1, stirred for 15 min, and then 0.75 parts of Span80 were added and stirred for another 15 min to form solution E; J4: Solution E was slowly dripped into 200 parts of deionized water solution containing 0.35 parts of sodium dodecylbenzene sulfonate, stirred continuously at 450 rpm for 4 hours in a 40°C water bath, and then washed and dried to obtain antistatic multi-level porous cellulose acetate microspheres FPM.

[0035] In the pre-preparation of this embodiment, the carbon nanotubes can also be replaced by one or more of graphene, nanosilver particles, carbon black, and graphite. The resulting antistatic ability and other changes and improvements brought about by extension all fall within the scope of the invention claimed for protection.

[0036] In a specific embodiment, the diameter of the textile yarn of the substrate fabric is the same as the warp density, the warp density is 128 yarns / inch, and the weft density is 60 yarns / inch. The yarn specifications selected are close to 150dtex / 20F.

[0037] Since the technical solution of the present invention is to functionalize the substrate fabric, for the conventional school uniform fabric design in which the middle layer is made of viscose fiber and the surface layer is made of polyester filament, this conventional usage does not affect the use of other fabrics in the middle layer and surface layer of the school uniform product of the present invention.

[0038] Example 1: The first method for preparing school uniforms of core-shell structure low-temperature spinning fabrics Preparation of hydrogel core by cyclic heating method: S1-1: 0.1 parts of multi-level porous cellulose acetate microspheres were mixed with 5 parts of deionized water, and ultrasonically dispersed to obtain a microsphere dispersion; S1-2: 0.1 parts of sodium alginate was mixed with 35 parts of deionized water, and stirred at 18° C. for 24 hours to obtain a sodium alginate solution; S1-3: Mix 5 parts of microsphere dispersion, 0.08 parts of KH550, and the sodium alginate solution prepared in step S2, heat in a cycle three times, centrifuge at 7000r / min, add 7 parts of cyclohexane and ultrasonicate, add 0.1 parts of calcium chloride at the same time, centrifuge, and obtain the core-shell microsphere PM1 of hydrogel@multi-level porous cellulose acetate microspheres.

[0039] Heating conditions: incubate in a 60°C water bath for 30 min, then incubate in a 20°C water bath for 30 min.

[0040] Figure 3 This is a schematic electron microscope diagram of the core-shell microsphere PM1 of the hydrogel@multi-level porous cellulose acetate microsphere prepared in this embodiment. It can be seen that the core-shell microsphere prepared by the cyclic heating method has a denser filling of the multi-level pores, indicating that this technical method is suitable for the placement of the hydrogel core.

[0041] Preparation of acetate fiber by low temperature spinning: F1-1: 2.8 parts of core-shell microspheres PM1 were dispersed in 53 parts of a composite spinning solvent of dichloromethane and acetone, with the mass ratio of acetone to dichloromethane being 1:5, to prepare a solution; F1-2: 12 parts of cellulose acetate were added to the solution in step F1-1 in three portions, and dissolved by stirring at room temperature to prepare a spinning solution; F1-3: The spinning solution is spun at a spinning pressure of 3 Bar to obtain spun yarn after cooling, and then the spun yarn is stretched at a stretching speed of 100 r / min and 20° C. to obtain acetate fiber after the solvent evaporates.

[0042] Acetate fibers are woven in warp and weft to prepare a base fabric. The base fabric, the middle layer and the surface layer are then bonded together to prepare a school uniform. The warp and weft holes of the middle layer are smaller than those of the base layer, and the warp and weft holes of the surface layer are the smallest.

[0043] Example 2: The second method for preparing school uniforms of core-shell structure low-temperature spinning fabrics Preparation of hydrogel cores by cyclic freezing method: S2-1: 0.2 parts of porous cellulose acetate microspheres were mixed with 8 parts of deionized water, and ultrasonically dispersed to obtain a microsphere dispersion; S2-2: 0.1 parts of sodium alginate was mixed with 40 parts of deionized water, and stirred at 15° C. for 24 hours to obtain a sodium alginate solution; S3-3: Mix 5 parts of microsphere dispersion, 0.08 parts of KH550, and the sodium alginate solution prepared in step S2-2, freeze three times in a cycle, centrifuge at 7000 r / min, add 8 parts of cyclohexane and ultrasonicate, add 0.15 parts of calcium chloride at the same time, centrifuge, and obtain the core-shell microsphere PM2 of the multi-level porous hydrogel@porous cellulose acetate microsphere.

[0044] Freezing conditions: Freeze at -25℃ for 1h, then thaw naturally to 25℃.

[0045] Figure 4 This is an electron microscope schematic diagram of the core-shell microsphere PM2 of the multi-level porous hydrogel@porous cellulose acetate microsphere. It can be seen that the water molecules in the hydrogel are crystallized through the cyclic freezing method, thereby squeezing the gel molecules onto the skeleton structure of the porous cellulose acetate microsphere, forming a conformal multi-level porous structure, thereby ensuring that the hydrogel has a larger water absorption space and mechanical structural strength when working. The multi-level porous structure also provides a sufficient cavity environment for reflecting and scattering sunlight.

[0046] Preparation of acetate fiber by low temperature spinning: F2-1: Weigh 3 parts of core-shell microspheres PM2 and disperse them in 55 parts of a composite spinning solvent of dichloromethane and acetone, with the mass ratio of acetone to dichloromethane being 1:5; F2-2: Then 15 parts of cellulose acetate were added to the solution in three portions and dissolved by stirring at room temperature to prepare a spinning solution; F2-3: The spinning solution is spun at a spinning pressure of 4 Bar to obtain spun yarn after cooling, and then the spun yarn is stretched at a stretching speed of 80 r / min and 20° C. to obtain acetate yarn after the solvent evaporates.

[0047] Acetate fibers are woven in warp and weft to prepare a base fabric. The base fabric, the middle layer and the surface layer are then bonded together to prepare a school uniform. The warp and weft holes of the middle layer are smaller than those of the base layer, and the warp and weft holes of the surface layer are the smallest.

[0048] Example 3: Preparation of functional fabric school uniforms by tie-dyeing antistatic fabrics Preparation of hydrogel core: S3-1: 0.15 parts of the antistatic porous cellulose acetate microspheres FPM are mixed with 7 parts of deionized water, and ultrasonically dispersed to obtain a microsphere dispersion; S3-2: 0.1 parts of sodium alginate was mixed with 40 parts of deionized water, and stirred at 15° C. for 24 hours to obtain a sodium alginate solution; S3-3: 5 parts of microsphere dispersion, 0.1 parts of KH550, and the sodium alginate solution prepared in step S2 were mixed, cyclically heated three times, centrifuged at 6000 r / min, added with 8 parts of cyclohexane and ultrasonicated, and 0.1 parts of calcium chloride were added at the same time, and centrifuged to obtain hydrogel@porous cellulose acetate microsphere shell core microsphere FPM3; Heating conditions: incubate in a 60°C water bath for 30 min, then incubate in a 20°C water bath for 30 min.

[0049] Low temperature tie-dyeing preparation of antistatic fabrics: Z3-1: 7%wt core-shell microspheres, 0.6%wt sodium dodecylbenzene sulfonate, and 1.75%wt dimethylol dihydroxyethylene urea were added to 1L water, and the grey cloth was soaked under the condition of 1:16 bath ratio to form a tie-dyed cloth with 85% liquid squeeze rate; Z3-2: Add 4%wt core-shell microspheres, 0.7%wtsodium dodecylbenzenesulfonate, and 1.25%wtdihydroxymethyldihydroxyethylene urea into 1L water, and soak the tie-dyed cloth in step Z3-1 at a bath ratio of 1:22 to form a secondary tie-dyed cloth with a liquid extraction rate of 65%, and dehydrate and dry to prepare a functional substrate fabric.

[0050] The functional substrate fabric, the middle layer and the surface layer are bonded together to prepare school uniforms. The warp and weft holes of the middle layer are smaller than those of the substrate layer, and the warp and weft holes of the surface layer are the smallest. The resistivity of the fiber fabric of the present invention is 700-800Ω.cm, which is about 30-40% lower than the average value of 1200Ω.cm of natural fiber fabrics, significantly facilitating high-intensity friction activities and reducing the friction static electricity level between the substrate fabric and the skin.

[0051] Comparative Example 1, Preparation of Hydrogel@Hollow Cellulose Acetate Microspheres Preparation of cellulose acetate microspheres DC1-1: 2 parts of cellulose acetate are dissolved in 20 parts of N,N-dimethylformamide, then added to 105 parts of dichloromethane solution and stirred evenly to form solution DC1-1; DC1-2: Add 3 parts of Span80 to solution DC1-1 and continue stirring for 15 minutes to form solution DC1-2; DC1-3: Add 15 parts of solution DC1-2 dropwise into 100 parts of deionized water solution containing 0.25 parts of sodium dodecylbenzene sulfonate, stir continuously at 600 rpm for 10 min, then heat in a water bath at 80°C for 1 min, add 1 part of dicyclohexylmethane diisocyanate, stir for 30 s, then wash with water and dry to obtain hollow open-cell cellulose acetate microspheres HPM.

[0052] Preparation of hydrogel core: DS1-1: 0.15 parts of porous cellulose acetate microspheres were mixed with 7 parts of deionized water and ultrasonically dispersed to obtain a microsphere dispersion; DS1-2: Mix 0.1 parts of sodium alginate with 40 parts of deionized water and stir at 15°C for 24 hours to obtain a sodium alginate solution; DS1-3: 5 parts of microsphere dispersion, 0.1 parts of KH550 and sodium alginate solution were mixed, and the mixture was frozen at -25°C by cyclic freezing method, and then thawed naturally to 25°C. After three cycles, 8 parts of cyclohexane were added and ultrasonicated, and 0.1 parts of calcium chloride were added at the same time, and centrifuged to obtain core-shell microspheres of hydrogel@porous cellulose acetate microspheres; The freezing times were 1 h, 10 h and 24 h respectively, and three freezing method samples DS1, DS10 and DS24 were prepared.

[0053] The water absorption capacity of the core-shell microspheres prepared under different conditions was investigated by the adsorption capacity of industrial disperse red FB fuel. Disperse red FB aqueous solution was prepared at a concentration of 20 mg / L. 1 g of core-shell microsphere samples of each embodiment and comparative example were placed in 6 beakers of disperse red FB aqueous solution, and the beakers were placed on a constant temperature oscillator for 12 hours. Samples were taken for testing and the dye removal rate was calculated. The test results are shown in Figure 5 .

[0054] It can be seen that the shell core microspheres prepared in Example 2 have the strongest adsorption capacity, which can exceed 90% in 4 hours. The comparative example DS24 is prepared based on three cycles of freezing with a freezing time of 24 hours. Although it does not have multi-level porous cellulose acetate microspheres as a skeleton, it eventually generates a qualified multi-level porous hydrogel core, and its pore volume is close to that of Example 2, so the dye adsorption capacity also reaches 90% at 12 hours. However, since Examples 1 and 3 use the cyclic heating method to insert the hydrogel core, the filling of hydrogel molecules is relatively large, and the pore volume is significantly lower than the multi-level pores, so the adsorption capacity is second. For the samples of DS10 and DS1, due to the insufficient cyclic freezing time, an effective porous state cannot be formed, and thus it obviously does not have a strong removal ability.

[0055] It can be seen from the adsorption capacity that the multi-level porous core and the skeleton are equally important for the adsorption speed of sweat, and the multi-level porous skeleton is more conducive to the cyclic freezing method to shorten the preparation time of the multi-level porous core. The technical solution of the present invention can significantly improve the preparation efficiency of the multi-level porous hydrogel core@multi-level porous cellulose acetate microspheres.

[0056] The present invention also tests the parameters of air permeability, moisture permeability, evaporation rate, fracture, bursting, etc. for the substrate fabric prepared in the embodiment and common school uniform materials. See Table 1 for details.

[0057] Table 1 As can be seen from Table 1, Example 2 of the present invention has excellent air permeability, moisture permeability and evaporation rate. Since it adopts cellulose acetate spinning, it is weaker than traditional pique cloth and polyester cover cotton in terms of bursting ability, but this shortcoming can be added to the warp during warp and weft spinning. Mixed weaving of high-strength fibers. Since Example 3 is prepared from cotton fiber grey cloth, its various properties mainly depend on the matrix fiber, but the shell-core microspheres still play a certain role, which helps to provide an effective adhesion technology method to improve the air permeability and moisture permeability when spinning cannot be used. But relatively speaking, the adhesion contact of heterogeneous fibers inhibits various properties, which is why the low-temperature spinning of the present invention uses cellulose acetate to coat the shell-core microspheres.

[0058] Under the condition of direct sunlight in summer (ambient temperature 43°C), the substrate fabric was soaked with water and covered with wet sandy ground, and the ground temperature was measured after 1 hour. Based on the polyester cover cotton, the ground temperature covered by Example 2 is lower, has better sunlight avoidance ability, and provides better evaporative cooling effect.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A breathable and refreshing school uniform fabric, characterized in that: The invention comprises a substrate layer and a surface layer, wherein the substrate layer is prepared from low-temperature composite core-shell microspheres of matrix fibers, the core-shell microspheres have hydrogels as cores and multi-level porous cellulose acetate microspheres as shells, the multi-level porous cellulose acetate microspheres have a particle size of 5 to 30 μm and at least three levels of pores, the precursor solution of the hydrogel is stirred and mixed with the multi-level porous cellulose acetate microspheres, and then an intermediate is prepared by a cyclic temperature change method, and the intermediate is fused with a cross-linking agent to form hydrogel@multi-level porous cellulose acetate microspheres, wherein the pore sizes of the three levels of pores are respectively 15 to 30%, 4 to 8%, and 1 to 2% of the particle size of the multi-level porous cellulose acetate microspheres.

2. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The cyclic temperature change method is a cyclic freezing method or a cyclic heating method. The high and low point temperatures of the cyclic freezing method are 25°C and -25°C, the high temperature point is naturally thawed, the low temperature point is frozen for 1 to 2 hours, and the number of cycles is 3 to 5 times. The high and low point temperatures of the cyclic heating method are 60°C and 20°C, the high and low temperature points are kept for 30 minutes, and the number of cycles is 3 to 5 times.

3. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The multi-level porous cellulose acetate microspheres are prepared by an emulsion drying method from cellulose acetate, a solvent, and an emulsifier in a mass ratio of 1 to 1.5:45 to 55:0.8 to 1.2, wherein the degree of substitution of the cellulose acetate is between 2.3 and 2.8, the solvent is one or more of dichloromethane and acetone, and the emulsifier is one or more of polyvinyl alcohol, SPAN80, and sodium dodecyl sulfate.

4. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The surface of the multi-level porous cellulose acetate microspheres is doped with a conductive material, wherein the conductive material is one or more of carbon nanotubes, graphene, and nanosilver particles, and the amount of the conductive material is 15-25%wt of the multi-level porous cellulose acetate microspheres.

5. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The preparation method of the matrix fiber low-temperature composite core-shell microspheres is low-temperature spinning and embedding; The preparation method of the low-temperature spinning embedding comprises the following steps: F1: 2-4 parts of core-shell microspheres are added to a composite spinning solvent containing 45-55 parts of dichloromethane and acetone as a dispersant to prepare a mixed solution, wherein the mass ratio of the acetone to the dichloromethane is 1:5; F2: 10-15 parts of cellulose acetate are added to the mixed solution in three portions, stirred and dissolved at room temperature to prepare a spinning solution; F3: The spinning solution is spun at a spinning pressure of 3 to 4 Bar to obtain spun yarn after cooling. The spun yarn is stretched at a stretching speed of 80 to 100 r / min and 20°C. Acetate fiber is obtained after the solvent evaporates. The acetate fiber is woven alone or with other material fibers for warp and weft to prepare functional substrate fabrics.

6. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The preparation method of the matrix fiber low-temperature composite core-shell microspheres is low-temperature tie-dye adhesion; The preparation method of the low-temperature tie-dye adhesion comprises the following steps: Z1: add 6-8%wt core-shell microspheres, 0.5-0.8%wt surfactant, and 1.5-2%wt cross-linking agent in 1L water, and soak the natural fiber grey cloth under the bath ratio of 1:14-18 to form a primary tie-dyed cloth; Z2: Add 3.5-4.5%wt core-shell microspheres, 0.5-0.8%wt surfactant, and 1-1.5%wt cross-linking agent into 1L water, and soak the tie-dyed cloth in step Z1 under a bath ratio of 1:20-25 to form a secondary tie-dyed cloth, dehydrate and dry to prepare a functional substrate fabric.

7. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The hydrogel is prepared from natural polymer raw materials, and the natural polymer raw materials are one or more of collagen, gelatin, hyaluronic acid, chitosan, hyaluronic acid, fibrin, alginate, cellulose, agarose, dextran, guar gum, and protein.

8. The breathable and refreshing school uniform fabric according to claim 5, characterized in that: In the low-temperature spinning embedding preparation method, the diameter of the core-shell microsphere is smaller than the diameter of the matrix fiber.

9. The breathable and refreshing school uniform fabric according to claim 6, characterized in that: The natural fiber grey cloth is composed of one or more of cotton fiber, hemp fiber, wood fiber, bamboo fiber, chitin fiber, chitosan fiber and cellulose acetate fiber.

10. A school uniform made from the breathable and refreshing school uniform fabric according to any one of claims 1 to 9.

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