Breathable and refreshing school uniform fabric and school uniform

Abstract

The present invention discloses a breathable and refreshing school uniform fabric and school uniform, specifically relating to the technical field of clothing fabrics. The fabric comprises a substrate layer and a surface layer. The substrate layer is composed of functional fibers composited from matrix fibers and core-shell microspheres. 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. A precursor solution of the hydrogel is stirred and mixed with the multi-level porous cellulose acetate microspheres to preform an intermediate by a cyclic temperature change method. A cross-linking agent is then added to prepare hydrogel@multi-level porous cellulose acetate core-shell microspheres. The functional fiber is prepared by low-temperature spinning or low-temperature tie-dyeing to achieve the composite of the core-shell microspheres. The substrate layer has the functions of absorbing water, losing water, and scattering sunlight, thereby improving the wear feel during high temperatures in summer. The multi-level porous cellulose acetate microspheres provide stress constraint and mechanical protection, thereby ensuring the functional life of the hydrogel.

Description

Technical Field

[0001] The present 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 traditions of the school but also influence students' daily wearing experience and sense of self-identity. In recent years, with the development of the times and the shift in social aesthetics, school uniform design has gradually shifted from a single standardization to a dual combination of functionality and aesthetics, becoming a new vehicle for educational innovation and student individual expression. However, school uniform design often focuses on uniformity and standardization, overlooking the actual needs of students in different seasons and activities, especially the functional need for breathable and refreshing summer uniforms. However, in reality, the production methods of functional textile fabrics are still relatively primitive, with either high production costs or demanding production conditions, which limits the production and application of functional fabrics. Existing fabrics are generally made of chemical fiber fabrics, which are easy to evaporate moisture, are heavy, lack the refreshing and breathable properties, and can easily cause allergies in sensitive individuals. They are also prone to static electricity in dry environments, which is detrimental to health. Therefore, there is a market demand for clothing made of refreshing and breathable textile fabrics to meet people's daily 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:

[0005] 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 hydrogel as the core and multi-level porous cellulose acetate microspheres as the shell.

[0006] Preferably, the multi-level porous cellulose acetate microspheres have a particle size of 5 to 30 μm and a pore size of at least three levels.

[0007] 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.

[0008] 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 the hydrogel@multi-level porous cellulose acetate microspheres.

[0009] More preferably, the cyclic temperature change method is a cyclic freezing method or a cyclic heating method.

[0010] More preferably, the high and low temperature points 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.

[0011] More preferably, the high and low temperature points of the cyclic heating method are 60° C. and 20° C., the holding time of the high and low temperature points is 30 minutes, and the number of cycles is 3 to 5 times.

[0012] 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 1-1.5:45-55:0.8-1.2.

[0013] 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 lauryl sulfate.

[0014] Preferably, the matrix fiber low-temperature composite core-shell microspheres are prepared by low-temperature spinning and embedding.

[0015] More preferably, the preparation method of the low-temperature spinning embedding comprises the following steps:

[0016] F1: Weigh 2-4 parts of core-shell microspheres and disperse them in 45-55 parts of a mixed spinning solvent of dichloromethane and acetone, with a mass ratio of acetone to dichloromethane of 1:5;

[0017] 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;

[0018] F3: The spinning solution is spun at a spinning pressure of 3-4 bar. After cooling, spun yarn is obtained. The spun yarn is then drawn at a speed of 80-100 r / min and a temperature of 20°C. After the solvent evaporates, acetate fiber is obtained. Acetate fiber is woven in warp and weft, either alone or with other fibers, to produce a base fabric.

[0019] 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 fiber.

[0020] 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.

[0021] Preferably, the matrix fiber low-temperature composite core-shell microspheres are prepared by low-temperature tie-dyeing and adhesion.

[0022] More preferably, the preparation method of the low-temperature tie-dye adhesion comprises the following steps:

[0023] Z1: Add 6-8%wt core-shell microspheres, 0.5-0.8%wt surfactant, and 1.5-2%wt cross-linking agent to 1L of water, and soak the natural fiber fabric at a bath ratio of 1:14-18 to form a primary tie-dyed fabric;

[0024] 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 of water, and soak the tie-dyed cloth in step Z1 at a bath ratio of 1:20-25 to form a secondary tie-dyed cloth, which is then dehydrated and dried to prepare a functional substrate fabric.

[0025] More preferably, the natural fiber fabric is composed of one or more of cotton fiber, hemp fiber, wood fiber, bamboo fiber, chitin fiber, chitosan fiber, and cellulose acetate fiber.

[0026] Preferably, the hydrogel is prepared using natural polymer raw materials.

[0027] 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.

[0028] More preferably, the natural polymer raw material is one of sodium alginate, chitosan and cellulose.

[0029] Preferably, the multi-level porous cellulose acetate microspheres are doped with a conductive material.

[0030] More preferably, the conductive material is composed of one or more of carbon nanotubes, graphene, and nanosilver particles.

[0031] More preferably, the amount of the conductive material is 15-25% by weight of the multi-level porous cellulose acetate microspheres.

[0032] The present invention also provides a school uniform, which is made of the breathable and refreshing school uniform fabric.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. By introducing the core-shell microspheres of hydrogel@multi-level porous cellulose acetate microspheres as functional water absorption and dehydration additives, the hydrogel accelerates the absorption of sweat in high temperatures in summer, and the multi-level porous cellulose acetate microspheres provide mechanical protection and siphon water absorption functions. The composite structure helps to reduce the warp and weft textile density of the substrate layer while ensuring freshness, thereby improving breathability.

[0035] 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, reducing the radiant heat penetration rate of sunlight. At the same time, it is beneficial to the temperature rise of the hydrogel core, increasing water evaporation, and promoting a refreshing feeling during outdoor activities.

[0036] 3. Antistatic materials are easily attached to the 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. In addition, static electricity also causes dust adsorption and accumulation, seriously affecting the appearance and sales of fabric products. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the electron microscope structure of the multi-level porous cellulose acetate microspheres of the present invention;

[0038] Figure 2 Schematic diagram of the cross section of the multi-level porous cellulose acetate microspheres of the present invention;

[0039] Figure 3 This is an electron microscope diagram of the hydrogel@multi-level porous cellulose acetate microspheres prepared in Example 1 of the present invention;

[0040] Figure 4 This is an electron microscope diagram of the hydrogel@multi-level porous cellulose acetate microspheres of Example 2 of the present invention;

[0041] Figure 5 Schematic diagram of the dye adsorption efficiency of core-shell microspheres prepared in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0043] The present invention pre-prepared multi-level porous cellulose acetate microspheres by the emulsion drying method, and obtained 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 as follows:

[0044] Q1: Add 1.5 parts of cellulose acetate to 50 parts of dichloromethane solution and stir at 5°C for 2 hours to form solution A;

[0045] Q2: Add 0.75 parts of Span80 to solution A and continue stirring for 15 minutes to form solution B;

[0046] Q3: Solution B was added dropwise to 100 parts of deionized water solution containing 0.2 parts of sodium dodecylbenzenesulfonate, stirred continuously at 450 rpm for 4 hours in a 40°C water bath, and then washed and dried to obtain hierarchical porous cellulose acetate microspheres.

[0047] In this 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 addition amount is 1.2 to 1.8 parts, the particle size distribution is 5 to 30 μm. Figure 1 Schematic diagram of the electron microscope of the multi-level porous cellulose acetate microspheres of the present invention, showing the pore size distribution. Figure 2 This is a cross-section of the multi-level porous cellulose acetate microspheres of the present invention. It can be seen that the multi-level pores are also distributed inside the spheres. The results of the specific surface area and pore size analyzer show that the specific surface area and pore volume of the 10μm microspheres are 105.3m 2 / g and 4.5cm 3 / g, and the properties of high voids and pore volume are used to ensure that the skeleton performance of the hydrogel core meets the standards.

[0048] 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:

[0049] J1: 0.2 parts of cellulose acetate was added to 50 parts of dichloromethane to form solution C;

[0050] J2: Dissolve 0.05 parts of carbon nanotubes and 1.5 parts of sodium lignin sulfonate in 20 parts of N,N-dimethylformamide to form solution D;

[0051] J3: Solution C and solution D were mixed in a volume ratio of 9:1, stirred for 15 minutes, and then 0.75 parts of Span80 were added and stirred for another 15 minutes to form solution E;

[0052] J4: Solution E was slowly dripped into 200 parts of deionized water solution containing 0.35 parts of sodium dodecylbenzenesulfonate, and stirred continuously at 450 rpm for 4 hours in a 40°C water bath. The solution was then washed with water and dried to obtain antistatic multi-level porous cellulose acetate microspheres FPM.

[0053] 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 fall within the scope of the invention claimed for protection.

[0054] In a specific embodiment, the base fabric has a textile yarn with the same diameter and warp and weft density, with a warp density of 128 yarns / inch and a weft density of 60 yarns / inch. The yarn specifications used are close to 150 dtex / 20F.

[0055] Since the technical solution of the present invention lies in the functionalization of the substrate fabric, for the conventional school uniform fabric design in which the middle layer is made of viscose fiber and the surface layer fabric 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.

[0056] Example 1: The first method for preparing school uniforms of core-shell structure low-temperature spinning fabrics

[0057] Preparation of hydrogel core by cyclic heating method:

[0058] S1-1: 0.1 parts of hierarchically porous cellulose acetate microspheres were mixed with 5 parts of deionized water and ultrasonically dispersed to obtain a microsphere dispersion;

[0059] 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;

[0060] S1-3: 5 parts of microsphere dispersion, 0.08 parts of KH550, and the sodium alginate solution prepared in step S2 were mixed, cyclically heated three times, centrifuged at 7000 r / min, added to 7 parts of cyclohexane and ultrasonicated, and 0.1 parts of calcium chloride were added at the same time, and centrifuged to obtain hydrogel@multi-level porous cellulose acetate microspheres shell core microspheres PM1.

[0061] Heating conditions: incubate in a 60°C water bath for 30 min, then incubate in a 20°C water bath for 30 min.

[0062] Figure 3 This is a schematic electron microscope diagram of the core-shell microsphere PM1 of the hydrogel@multi-level porous cellulose acetate microspheres prepared in this example. It can be seen that the core-shell microspheres prepared by the cyclic heating method are more densely filled with multi-level pores, indicating that this technical method is suitable for the placement of hydrogel cores.

[0063] Preparation of acetate fiber by low temperature spinning:

[0064] F1-1: 2.8 parts of core-shell microspheres PM1 were dispersed in 53 parts of a mixed spinning solvent of dichloromethane and acetone, with the mass ratio of acetone to dichloromethane being 1:5, to prepare a solution;

[0065] F1-2: 12 parts of cellulose acetate were added to the solution prepared in step F1-1 in three portions, and stirred at room temperature to dissolve to prepare a spinning solution;

[0066] 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 a temperature of 20° C. to obtain acetate fiber after the solvent evaporates.

[0067] Acetate yarn is woven warp and weft to produce a base fabric. The base fabric, the middle layer, and the surface layer are then bonded together to produce the school uniform. The warp and weft holes in the middle layer are smaller than those in the base layer, while the warp and weft holes in the surface layer are the smallest.

[0068] Example 2: Second method for preparing school uniforms of core-shell structure low-temperature spinning fabrics

[0069] Preparation of hydrogel cores by cyclic freezing method:

[0070] 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;

[0071] S2-2: 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;

[0072] S3-3: 5 parts of microsphere dispersion, 0.08 parts of KH550, and the sodium alginate solution prepared in step S2-2 were mixed, refrigerated three times, centrifuged at 7000 r / min, added to 8 parts of cyclohexane and ultrasonicated, and 0.15 parts of calcium chloride were added at the same time, and centrifuged to obtain the shell-core microspheres PM2 of the multi-level porous hydrogel@porous cellulose acetate microspheres.

[0073] Freezing conditions: Freeze at -25℃ for 1 hour, then thaw naturally to 25℃.

[0074] Figure 4 This is an electron microscope 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 similar conformal multi-level porous structure, thereby ensuring a larger water absorption space and mechanical structural strength for the hydrogel during operation. This multi-level porous structure also provides a sufficient cavity environment for reflecting and scattering sunlight.

[0075] Preparation of acetate fiber by low temperature spinning:

[0076] 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 a mass ratio of acetone to dichloromethane of 1:5;

[0077] F2-2: Then, 15 parts of cellulose acetate was added to the solution in three portions and dissolved by stirring at room temperature to prepare a spinning solution;

[0078] 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 fiber after the solvent evaporates.

[0079] Acetate yarn is woven warp and weft to produce a base fabric. The base fabric, the middle layer, and the surface layer are then bonded together to produce the school uniform. The warp and weft holes in the middle layer are smaller than those in the base layer, while the warp and weft holes in the surface layer are the smallest.

[0080] Example 3: Preparation of functional fabric school uniforms by tie-dyeing antistatic fabrics

[0081] Preparation of hydrogel core:

[0082] S3-1: 0.15 parts of the antistatic porous cellulose acetate microspheres FPM were mixed with 7 parts of deionized water, and ultrasonically dispersed to obtain a microsphere dispersion;

[0083] S3-2: 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;

[0084] S3-3: 5 parts of the 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 rpm, added to 8 parts of cyclohexane and sonicated, and 0.1 parts of calcium chloride were added at the same time, and centrifuged to obtain hydrogel@porous cellulose acetate microsphere shell core microspheres FPM3;

[0085] Heating conditions: incubate in a 60°C water bath for 30 min, then incubate in a 20°C water bath for 30 min.

[0086] Preparation of low-temperature tie-dyeing of anti-static fabrics:

[0087] Z3-1: Add 7%wt core-shell microspheres, 0.6%wt sodium dodecylbenzenesulfonate, and 1.75%wt dihydroxymethyl dihydroxyethylene urea to 1L of water at a bath ratio of 1:16, and soak the grey fabric to form a tie-dyed fabric with an 85% liquid-entrapment rate;

[0088] Z3-2: Add 4%wt core-shell microspheres, 0.7%wt sodium dodecylbenzenesulfonate, and 1.25%wt dihydroxymethyl dihydroxyethylene urea to 1L of water at a bath ratio of 1:22, and soak the tie-dyed cloth described in step Z3-1 to form a secondary tie-dyed cloth with a liquid extraction rate of 65%. Dehydrate and dry the cloth to prepare a functional substrate fabric.

[0089] The functional base fabric, middle layer, and surface layer are bonded together to produce a school uniform. The middle layer has smaller warp and weft holes than the base layer, while the surface layer has the smallest warp and weft holes. The fiber fabric of the present invention has a resistivity of 700-800 Ω.cm, approximately 30-40% lower than the average of 1200 Ω.cm for natural fiber fabrics. This significantly facilitates high-intensity friction activities and reduces the level of frictional static electricity between the base fabric and the skin.

[0090] Comparative Example 1, Preparation of Hydrogel@Hollow Cellulose Acetate Microspheres

[0091] Preparation of cellulose acetate microspheres

[0092] DC1-1: Dissolve 2 parts of cellulose acetate in 20 parts of N,N-dimethylformamide, then add 105 parts of dichloromethane solution and stir evenly to form solution DC1-1;

[0093] DC1-2: Add 3 parts of Span80 to solution DC1-1 and continue stirring for 15 minutes to form solution DC1-2;

[0094] DC1-3: 15 parts of solution DC1-2 were dropped into 100 parts of deionized water solution containing 0.25 parts of sodium dodecylbenzenesulfonate, stirred continuously at 600 rpm for 10 minutes, then heated in a water bath at 80°C for 1 minute, and 1 part of dicyclohexylmethane diisocyanate was added, stirred for 30 seconds, and then washed with water and dried to obtain hollow open-pore cellulose acetate microspheres HPM.

[0095] Preparation of hydrogel core:

[0096] 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;

[0097] 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;

[0098] DS1-3: 5 parts of microsphere dispersion, 0.1 parts of KH550, and sodium alginate solution were mixed and subjected to a cyclic freezing method. The mixture was frozen at -25°C and then thawed naturally to 25°C for three cycles. The mixture was then added to 8 parts of cyclohexane and ultrasonicated. 0.1 parts of calcium chloride was also added and the mixture was centrifuged to obtain core-shell microspheres of hydrogel@porous cellulose acetate microspheres.

[0099] The freezing times were 1 h, 10 h and 24 h respectively, and three freezing method samples DS1, DS10 and DS24 were prepared.

[0100] The water absorption capacity of 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 from each embodiment and comparative example were placed in 6 beakers of disperse red FB aqueous solution. 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 .

[0101] It can be seen that the core-shell microspheres prepared in Example 2 have the strongest adsorption capacity, exceeding 90% in 4 hours. Comparative Example DS24, prepared based on three cycles of freezing with a freezing time of 24 hours, although lacking multi-level porous cellulose acetate microspheres as a skeleton, ultimately produced a qualified multi-level porous hydrogel core with a pore volume close to that of Example 2, resulting in a dye adsorption capacity of 90% in 12 hours. However, Examples 1 and 3, due to the use of a cyclic heating method to insert the hydrogel core, were filled with more hydrogel molecules, resulting in a pore volume significantly lower than that of the multi-level pores, and therefore had inferior adsorption capacity. For samples DS10 and DS1, due to insufficient cyclic freezing time, an effective porous state could not be formed, and thus, a strong removal capacity was clearly lacking.

[0102] The adsorption capacity shows that the hierarchically porous core and skeleton are equally important for the speed of sweat adsorption, but the hierarchically porous skeleton is more conducive to the cyclic freezing method to shorten the preparation time of the hierarchically porous core. The technical solution of the present invention can significantly improve the preparation efficiency of hierarchically porous hydrogel core@hierarchically porous cellulose acetate microspheres.

[0103] The present invention also conducted tests on parameters such as air permeability, evaporation rate, fracture, and bursting for the substrate fabrics prepared in the examples and common school uniform materials. See Table 1 for details.

[0104] Table 1

[0105]

[0106] As can be seen from Table 1, Example 2 of the present invention has excellent air permeability, moisture permeability and evaporation rate. Since it uses cellulose acetate spinning, it is weaker than traditional piqué cloth and polyester cover cotton in terms of bursting ability, but this shortcoming can be overcome by adding high-strength fiber blending to the warp during warp and weft spinning. Since Example 3 is prepared from cotton fiber grey cloth, its various properties mainly depend on the matrix fiber, but the core-shell microspheres still play a certain role, which helps to provide an effective adhesion technology method to improve air and moisture permeability when spinning cannot be used. But relatively speaking, the adhesion contact of heterogeneous fibers inhibits various properties, which is why the present invention uses cellulose acetate coated core-shell microspheres for low-temperature spinning.

[0107] Under direct summer sunlight (ambient temperature 43°C), the substrate fabric was soaked in water and then covered with a damp sandy ground. The ground temperature was measured after one hour. Compared to the polyester cover cotton, Example 2 showed a lower ground temperature, exhibiting better sunlight shielding and providing a better evaporative cooling effect.

[0108] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended 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 matrix fiber low-temperature composite core-shell microspheres, wherein the core-shell microspheres have hydrogel as core and multi-level porous cellulose acetate microspheres as shell, wherein the multi-level porous cellulose acetate microspheres have a particle size of 5 to 30 μm and at least three levels of pores, wherein the precursor solution of the hydrogel and the multi-level porous cellulose acetate microspheres are stirred and mixed, 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 15 to 30%, 4 to 8%, and 1 to 2% of the particle size of the multi-level porous cellulose acetate microspheres, respectively.

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 temperature points of the cyclic freezing method are 25°C and -25°C, the high temperature point is naturally thawed, the low temperature point is frozen and maintained for 1 to 2 hours, and the number of cycles is 3 to 5 times. The high and low temperature points of the cyclic heating method are 60°C and 20°C, the high and low temperature points are maintained 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 dissolving agent, and an emulsifier in a mass ratio of 1-1.5:45-55:0.8-1.

2. 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. The emulsifier is one or more of polyvinyl alcohol, SPAN80, and sodium lauryl 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 composed of one or more of carbon nanotubes, graphene, and nanosilver particles, and the amount of the conductive material is 15 to 25% by weight of the multi-level porous cellulose acetate microspheres.

5. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The matrix fiber low-temperature composite core-shell microspheres are prepared by 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 dispersed in a composite spinning solvent of 45-55 parts of dichloromethane and acetone 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 were added to the mixture in three portions and stirred to dissolve 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. After the solvent evaporates, acetate fiber is obtained. The acetate fiber is woven alone or with other fibers to prepare a functional substrate fabric.

6. The breathable and refreshing school uniform fabric according to claim 1, characterized in that: The matrix fiber low-temperature composite core-shell microspheres are prepared by 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 to 1L of water, and soak the natural fiber fabric at a bath ratio of 1:14-18 to form a primary tie-dyed fabric; 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 of water, and soak the tie-dyed cloth in step Z1 at a bath ratio of 1:20-25 to form a secondary tie-dyed cloth, which is then dehydrated and dried 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, alginic acid, 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 microspheres 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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