Bio-based cool fabric and preparation method thereof

Abstract

The invention discloses a bio-based cool fabric and a preparation method thereof, and relates to the technical field of functional textile materials. When the bio-based cool fabric is prepared, firstly, furandicarboxylic acid, octafluoro-1, 6-hexanediol and itaconic acid are subjected to copolycondensation and then react with gamma-mercaptopropyltrimethoxysilane modified boron nitride, melt spinning is conducted, and heat conduction type hydrophobic fibers are prepared; secondly, extruding the sodium alginate spinning solution containing silver nitrate into a calcium chloride composite solution containing ascorbic acid, and performing in-situ reduction to obtain nano-silver particle loaded alginate fibers; and finally, performing rib-type composite weaving on the heat-conducting hydrophobic fibers and the nano-silver particle loaded alginate fibers according to a specific mass ratio to obtain the bio-based cool fabric. The bio-based cool fabric prepared by the invention has excellent heat-conducting property, moisture-conducting property and antibacterial property.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional textile materials, in particular to a bio-based cool fabric and a preparation method thereof. BACKGROUND

[0002] With the increasing demand for comfort and functionality of clothing, cool fabrics are increasingly widely used in summer clothing, sports equipment and other fields. The cool fabrics on the market are mostly based on petroleum-based synthetic fibers such as polyester and nylon, and achieve preliminary cooling effect by adding cool finishing agents or using hollow structure design. They occupy a certain market share due to their good mechanical properties and processability. However, such traditional cool fabrics have obvious limitations. First, the cooling function relies on the attachment of cool additives through post-finishing process, which is prone to functional degradation due to washing and has poor durability. Second, the use of petroleum-based raw materials is contrary to the current concept of green and sustainable development. Finally, most cool fabrics lack antibacterial properties and are prone to bacterial growth in hot environments, affecting hygiene and comfort.

[0003] In recent years, with the increasing environmental awareness and upgrading of functional requirements, fabrics with long-lasting cooling, antibacterial properties and bio-based characteristics have become a research hotspot. The shortcomings of traditional fabrics in terms of heat conduction efficiency, functional durability and environmental friendliness have become increasingly prominent, making it difficult to meet the comprehensive needs of consumers for "natural cooling, safe antibacterial, green and environmentally friendly". Therefore, developing composite fabrics based on bio-based raw materials and achieving efficient heat conduction cooling and long-lasting antibacterial function through intrinsic modification has become an important direction to solve the bottlenecks of existing technologies. SUMMARY

[0004] The purpose of the present application is to provide a bio-based cool fabric and a preparation method and application thereof to solve the problems in the prior art.

[0005] To solve the above technical problems, the present application provides the following technical solutions: A bio-based cool fabric is prepared by rib-type composite weaving of heat-conducting hydrophobic fibers and nano-silver particle-loaded seaweed fibers in a specific mass ratio.

[0006] As an optimization, the heat-conducting hydrophobic fibers are prepared by co-polymerization of furan dicarboxylic acid, octafluoro-1,6-hexanediol and itaconic acid, then reacted with modified boron nitride and melt-spun.

[0007] As an optimization, the modified boron nitride is prepared by reacting gamma-mercaptopropyltrimethoxysilane with hexagonal boron nitride powder.

[0008] As an optimization, the nano-silver particle-loaded seaweed fiber is prepared by in-situ reduction of sodium alginate spinning solution containing silver nitrate into calcium chloride composite solution containing ascorbic acid.

[0009] A method for preparing a bio-based cool fabric, comprising the following preparation steps: (1) In a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate are uniformly mixed in a molar ratio of 1:(1.2-1.6):(0.3-0.7):(0.02-0.06), stirred at 160-200°C and 200-400 r / min for 2-4 h, uniformly reduced to 50 Pa in 0.5-1.5 h, heated to 210-250°C, and continuously stirred for 1-5 h. After cooling, it is crushed, passed through a 30-60 mesh sieve, and dried under vacuum conditions at 20-40 Pa, 100-120°C for 20-40 min, heated to 130-150°C for 20-40 min, and heated to 180-220°C for 8-12 h to prepare a bio-based hydrophobically modified polyester; hexagonal boron nitride powder, γ-mercaptopropyltrimethoxysilane, anhydrous ethanol and deionized water are mixed in a mass ratio of 1:(0.01-0.03):(60-80):(5-10), stirred at 50-70°C and 200-400 r / min for 20-28 h, washed with deionized water by centrifugation, and dried at 70-90°C for 6-10 h to prepare modified boron nitride; the bio-based hydrophobically modified polyester and the modified boron nitride are uniformly mixed in a mass ratio of 1:(0.05-0.09), added to a screw extruder, extruded, pelletized, dried, and then melt-extruded through a single screw, melt-spun, and drawn and set to prepare a heat-conductive hydrophobic fiber; (2) Sodium alginate and deionized water are uniformly mixed in a mass ratio of 1:20-50, stirred at 25-30°C and 200-400 r / min for 4-6 h, and left to stand for 12-24 h to prepare a sodium alginate spinning solution; silver nitrate powder with a mass fraction of 0.5%-3% of the dry weight of sodium alginate is added to the sodium alginate spinning solution, stirred in the dark at 25-30°C and 200-400 r / min for 1-2 h to prepare a silver nitrate-sodium alginate mixture; anhydrous calcium chloride, ascorbic acid and deionized water are mixed in a mass ratio of 1:(0.1-0.3):(50-70), stirred at 25-30°C and 200-400 r / min for 1-3 h to prepare a calcium chloride composite solution; the silver nitrate-sodium alginate mixture is extruded into the calcium chloride composite solution through a 100-300 μm pore size syringe pump; the resulting fiber is removed, washed with deionized water 3-5 times, and dried to prepare a nanosilver particle-loaded seaweed fiber; (3) The heat-conductive hydrophobic fiber with a yarn linear density of 400-500 dtex and the nanosilver particle-loaded seaweed fiber with a yarn linear density of 80-100 dtex are compounded by rib weaving in a mass ratio of 1:0.1-0.5 to prepare a bio-based cool fabric.

[0010] As optimization, the reaction process of the bio-based hydrophobic modified resin in step (1) is:

[0011] As optimization, the hexagonal boron nitride powder in step (1) has a purity of ≥99.9%, a particle size of 1-2 μm, and a manufacturer of Shanghai Aladdin Biochem Technology Co., Ltd.

[0012] As optimization, the melt spinning method in step (1) is as follows: spinning is performed through single-screw melt extrusion under the conditions of a screw temperature of 200-230 ℃, a spinning box temperature of 200-220 ℃, a metering pump rotating speed of 10-20 r / min, and a winding speed of 350-450 m / min, followed by drawing and setting to obtain the heat-conductive hydrophobic fiber.

[0013] As optimization, the sodium alginate, silver nitrate, anhydrous calcium chloride, and ascorbic acid in step (2) are all analytically pure, and the manufacturer is Shanghai Aladdin Biochem Technology Co., Ltd.

[0014] Compared with the prior art, the present application has the following beneficial effects: In the preparation of the bio-based cool fabric, furandicarboxylic acid, octafluoro-1,6-hexanediol, and itaconic acid are co-polycondensed, and then reacted with γ-mercaptopropyltrimethoxysilane modified boron nitride to form a heat-conductive hydrophobic fiber through melt spinning; sodium alginate containing silver nitrate is extruded into a calcium chloride composite solution containing ascorbic acid to in-situ reduce and obtain a sodium alginate fiber loaded with nano silver particles; and the heat-conductive hydrophobic fiber and the sodium alginate fiber loaded with nano silver particles are combined in a rib type to obtain the bio-based cool fabric.

[0015] First, furandicarboxylic acid, octafluoro-1,6-hexanediol, and itaconic acid containing double bonds are co-polycondensed to prepare a hydrophobic polyester, which is then modified with γ-mercaptopropyltrimethoxysilane to make the surface mercapto group of the boron nitride react with the double bonds of the itaconic acid units in the polyester through high-efficiency mercapto-ene click chemistry during melt spinning, thereby forming a covalently bonded heat-conductive network and significantly improving the thermal conductivity of the fiber. Meanwhile, the octafluoro-1,6-hexanediol endows the fiber with superhydrophobicity. The ladder-type solid-state polycondensation after melt polycondensation improves the molecular weight and mechanical properties, and realizes the synergy of high thermal conductivity and high mechanical strength.

[0016] Secondly, the sodium alginate spinning solution containing silver nitrate is extruded into a calcium chloride and ascorbic acid composite coagulation bath, calcium ions are cross-linked to form a three-dimensional network skeleton, and silver ions are anchored in the calcium alginate grid through ion exchange; ascorbic acid reduces silver ions in situ to nano-silver particles in the cross-linked network, and the obtained nano-silver particles form an interpenetrating network with calcium alginate, which significantly improves the antibacterial effect of the fiber on escherichia coli and staphylococcus aureus; the heat-conducting hydrophobic fiber and the alginate fiber loaded with nano-silver particles are woven into a biomimetic one-way moisture transfer system through ribbing composite, the hydrophobic fiber repels sweat in the inner layer and pushes it outward; the hydrophilic fiber in the outer layer quickly absorbs and diffuses sweat, realizing one-way transmission of sweat from the skin surface to the outside, promoting evaporation cooling, significantly improving the cool comfort, while maintaining high air permeability and durability of the fabric. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] In order to more clearly illustrate the method provided by the present application, the following examples are used for detailed description. Example 1

[0019] A preparation method of a bio-based cool fabric, comprising the following preparation steps: (1) In a nitrogen atmosphere, furan dicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate are uniformly mixed in a molar ratio of 1:1.2:0.5:0.04, stirred at 160°C and 200r / min for 2h, uniformly reduced to 50Pa in 0.5h, and then continuously stirred at 230°C for 3h. After cooling, it is crushed and passed through a 30-mesh sieve to obtain pre-polymer particles. The pre-polymer particles are dried under vacuum conditions at 20Pa, 100°C for 20min, then at 130°C for 20min, and finally at 180°C for 8h to obtain bio-based hydrophobically modified polyester. Hexagonal boron nitride powder, γ-mercaptopropyl trimethoxysilane, anhydrous ethanol and deionized water are mixed in a mass ratio of 1:0.01:60:5, stirred at 50°C and 200r / min for 20h, centrifuged with deionized water, and then dried at 70°C for 6h to obtain modified boron nitride. The bio-based hydrophobically modified polyester and the modified boron nitride are uniformly mixed in a mass ratio of 1:0.07, added to a screw extruder for extrusion, pelletization and drying, and then melt-extruded through a single screw, to obtain heat-conducting hydrophobic fibers under the following conditions: screw temperature 200°C, spinning box temperature 200°C, metering pump speed 10r / min, and winding speed 350m / min. (2) Sodium alginate and deionized water were mixed evenly at a mass ratio of 1:20, stirred at 200 r / min for 4 h at 25 °C, and allowed to stand for 12 h to remove bubbles to obtain sodium alginate spinning solution; silver nitrate powder with a mass fraction of 0.5% of the dry weight of sodium alginate was added to the sodium alginate spinning solution, and stirred at 200 r / min for 1 h at 25 °C in the dark to obtain silver nitrate sodium alginate mixture; anhydrous calcium chloride, ascorbic acid and deionized water were mixed at a mass ratio of 1:0.1:50, and stirred at 200 r / min for 1 h at 25 °C to obtain calcium chloride composite solution; the silver nitrate sodium alginate mixture was squeezed into the calcium chloride composite solution through a 100 μm injection pump; the obtained fiber was taken out, washed 3 times with deionized water, and dried to obtain seaweed fiber loaded with nano-silver particles; (3) A bio-based cooling fabric is made by weaving thermally conductive hydrophobic fiber with a yarn linear density of 400dtex and seaweed fiber loaded with nano-silver particles with a yarn linear density of 80dtex in a rib-type composite weave at a mass ratio of 1:0.3 using a horizontal loom. Example 2:

[0020] A method for preparing a bio-based cooling fabric includes the following preparation steps: (1) In a nitrogen atmosphere, furanyl dicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed evenly in a molar ratio of 1:1.4:0.5:0.04. The mixture was stirred at 180°C and 300 r / min for 4 h. The pressure was uniformly reduced to 50 Pa within 1 h, the temperature was raised to 230°C, and the stirring was continued for 3 h. After cooling, the mixture was pulverized and passed through a 40-mesh sieve to obtain prepolymer particles. Under vacuum conditions, the prepolymer particles were dried at 30 Pa and 110°C for 30 min, then heated to 140°C for 30 min, and then heated to 200°C for 10 h to obtain a bio-based hydrophobic modified polyester. Hexagonal boron nitride powder and γ -Mercaptopropyltrimethoxysilane, anhydrous ethanol, and deionized water were mixed in a mass ratio of 1:0.02:70:7 and stirred at 60℃ and 300 r / min for 24 h. After centrifugation and washing with deionized water, the mixture was dried at 80℃ for 8 h to obtain modified boron nitride. Bio-based hydrophobic modified polyester and modified boron nitride were mixed evenly in a mass ratio of 1:0.07 and added to a screw extruder for extrusion, pelletizing, and drying. The mixture was then melt-extruded through a single screw and spun under the conditions of screw temperature 215℃, spinning box temperature 210℃, metering pump speed 15 r / min, and winding speed 400 m / min. After stretching and shaping, thermally conductive hydrophobic fibers were obtained. (2) uniformly mix sodium alginate and deionized water in a mass ratio of 1:35, stir at 27°C and 300 r / min for 5 h, and stand for 18 h to remove bubbles to prepare a sodium alginate spinning solution; add silver nitrate powder with a mass fraction of 2% of the dry weight of sodium alginate to the sodium alginate spinning solution, stir at 27°C and 300 r / min for 1.5 h in the dark to prepare a silver nitrate-sodium alginate mixture; mix anhydrous calcium chloride, ascorbic acid and deionized water in a mass ratio of 1:0.2:60, stir at 27°C and 300 r / min for 2 h to prepare a calcium chloride composite solution; extrude the silver nitrate-sodium alginate mixture through a 200-μm pore size syringe pump into the calcium chloride composite solution; take out the obtained fiber, wash it with deionized water 4 times, dry it, and prepare a silver nanoparticle-loaded seaweed fiber; (3) use a weft knitting machine to perform rib-type composite weaving of a heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and a silver nanoparticle-loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.3 to prepare a bio-based cool fabric. Example 3:

[0021] A preparation method of a bio-based cool fabric, comprising the following preparation steps: (1) uniformly mix furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate in a molar ratio of 1:1.6:0.5:0.04, stir at 200°C and 400 r / min for 4 h, uniformly reduce the pressure to 50 Pa within 1.5 h, continue to stir at 230°C for 3 h, cool, crush, and pass through a 60-mesh sieve to obtain pre-polymer particles; under vacuum conditions, dry the pre-polymer particles at 40 Pa, 120°C for 40 min, increase the temperature to 150°C for 40 min, and increase the temperature to 220°C for 12 h to prepare a bio-based hydrophobically modified polyester; mix hexagonal boron nitride powder, γ-mercaptopropyltrimethoxysilane, anhydrous ethanol and deionized water in a mass ratio of 1:0.03:80:10, stir at 70°C and 400 r / min for 28 h, centrifugally wash with deionized water, and dry at 90°C for 10 h to prepare modified boron nitride; uniformly mix the bio-based hydrophobically modified polyester and the modified boron nitride in a mass ratio of 1:0.07, add them to a screw extruder for extrusion, pelletization and drying, and then perform melt extrusion through a single-screw extruder under the conditions of a screw temperature of 230°C, a spinning box temperature of 220°C, a metering pump speed of 20 r / min and a winding speed of 450 m / min, spin, stretch and set to prepare a heat-conductive hydrophobic fiber; (2) The sodium alginate and deionized water were mixed uniformly at a mass ratio of 1:50, stirred at 30°C and 400 r / min for 6h, and then left to stand for 24h to remove bubbles to prepare a sodium alginate spinning solution; silver nitrate powder was added to the sodium alginate spinning solution at a mass fraction of 3% of the dry weight of sodium alginate, and the mixture was stirred at 30°C and 400 r / min for 2h in the dark to prepare a silver nitrate-sodium alginate mixture; anhydrous calcium chloride, ascorbic acid and deionized water were mixed at a mass ratio of 1:0.3:70, stirred at 30°C and 400 r / min for 3h to prepare a calcium chloride composite solution; the silver nitrate-sodium alginate mixture was extruded into the calcium chloride composite solution through a 300-μm pore size syringe pump; the obtained fiber was taken out, washed with deionized water for 5 times, and dried to prepare a silver nanoparticle-loaded seaweed fiber; (3) The heat-conductive hydrophobic fiber with a yarn linear density of 500 dtex and the silver nanoparticle-loaded seaweed fiber with a yarn linear density of 100 dtex were compounded by rib weaving at a mass ratio of 1:0.3 to prepare a bio-based cool fabric.

[0022] Comparative Example 1 The difference from Example 2 is only in step (1), that is, “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04 in a nitrogen atmosphere” was adjusted to “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.3:0.04 in a nitrogen atmosphere”.

[0023] Comparative Example 2 The difference from Example 2 is only in step (1), that is, “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04 in a nitrogen atmosphere” was adjusted to “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.4:0.04 in a nitrogen atmosphere”.

[0024] Comparative Example 3 The difference from Example 2 is only in step (1), that is, “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04 in a nitrogen atmosphere” was adjusted to “the furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.6:0.04 in a nitrogen atmosphere”.

[0025] Comparative Example 4 The only difference from Example 2 is the difference in step (1), changing "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04" to "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.02".

[0026] Comparative Example 5: The only difference from Example 2 is the difference in step (1), changing "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04" to "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.02".

[0027] Comparative Example 6: The only difference from Example 2 is the difference in step (1), changing "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04" to "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.3:0.03".

[0028] Comparative Example 7: The only difference from Example 2 is the difference in step (1), changing "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04" to "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.3:0.05".

[0029] Comparative Example 8: The only difference from Example 2 is the difference in step (1), changing "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.5:0.04" to "in a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were mixed uniformly at a molar ratio of 1:1.4:0.3:0.06".

[0030] Comparative Example 9: The difference from Example 2 is only in step (1), in which "under nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate are mixed uniformly in a molar ratio of 1:1.4:0.5:0.04, stirred at 180°C, 300 r / min for 4h, uniformly reduced to 50Pa in 1h, heated to 230°C, and stirred for another 3h, then crushed and sieved through a 40-mesh sieve after cooling to obtain pre-polymer particles" is adjusted to "heated to 210°C".

[0031] Comparative Example 10: The difference from Example 2 is only in step (1), in which "heated to 230°C" is adjusted to "heated to 220°C".

[0032] Comparative Example 11: The difference from Example 2 is only in step (1), in which "heated to 230°C" is adjusted to "heated to 240°C".

[0033] Comparative Example 12: The difference from Example 2 is only in step (1), in which "heated to 230°C" is adjusted to "heated to 250°C".

[0034] Comparative Example 13: The difference from Example 2 is only in step (1), in which "under nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate are mixed uniformly in a molar ratio of 1:1.4:0.5:0.04, stirred at 180°C, 300 r / min for 4h, uniformly reduced to 50Pa in 1h, heated to 230°C, and stirred for another 3h, then crushed and sieved through a 40-mesh sieve after cooling to obtain pre-polymer particles" is adjusted to "stirred for another 1h".

[0035] Comparative Example 14: The difference from Example 2 is only in step (1), in which "stirred for another 3h" is adjusted to "stirred for another 2h".

[0036] Comparative Example 15: The difference from Example 2 is only in step (1), in which "stirred for another 3h" is adjusted to "stirred for another 4h".

[0037] Comparative Example 16: The difference from Example 2 is only in step (1), in which "stirred for another 3h" is adjusted to "stirred for another 5h".

[0038] Comparative Example 17: The difference from Example 2 is only in the difference of step (1), and "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.07" is adjusted to "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.05".

[0039] Comparative Example 18: The difference from Example 2 is only in the difference of step (1), and "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.07" is adjusted to "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.06".

[0040] Comparative Example 19: The difference from Example 2 is only in the difference of step (1), and "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.07" is adjusted to "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.08".

[0041] Comparative Example 20: The difference from Example 2 is only in the difference of step (1), and "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.07" is adjusted to "mixing the bio-based hydrophobically modified polyester and the modified boron nitride uniformly at a mass ratio of 1:0.09".

[0042] Comparative Example 21: The difference from Example 2 is only in the difference of step (3), and "using a flat knitting machine to perform rib-type composite weaving of the heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle-loaded seaweed fiber with a yarn linear density of 90 dtex at a mass ratio of 1:0.3" is adjusted to "using a flat knitting machine to perform rib-type composite weaving of the heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle-loaded seaweed fiber with a yarn linear density of 90 dtex at a mass ratio of 1:0.1".

[0043] Comparative Example 22: The difference from Example 2 is only in the difference of step (3), and "using a flat knitting machine to perform rib-type composite weaving of the heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle-loaded seaweed fiber with a yarn linear density of 90 dtex at a mass ratio of 1:0.3" is adjusted to "using a flat knitting machine to perform rib-type composite weaving of the heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle-loaded seaweed fiber with a yarn linear density of 90 dtex at a mass ratio of 1:0.2".

[0044] Comparative Example 23: The difference from Example 2 is only in step (3), and the "rib type composite weaving of the heat-conducting hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.3 by using a flat knitting machine" is adjusted to "rib type composite weaving of the heat-conducting hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.4 by using a flat knitting machine".

[0045] Comparative Example 24: The difference from Example 2 is only in step (3), and the "rib type composite weaving of the heat-conducting hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.3 by using a flat knitting machine" is adjusted to "rib type composite weaving of the heat-conducting hydrophobic fiber with a yarn linear density of 450 dtex and the nanosilver particle loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.5 by using a flat knitting machine".

[0046] Comparative Example 25: A preparation method of a bio-based cool fabric, comprising the following preparation steps: (1) In a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1, 6-hexanediol, itaconic acid and antimony acetate are uniformly mixed in a molar ratio of 1:1.4:0.5:0.04, stirred at 180°C and 300r / min for 4h, uniformly reduced to 50Pa within 1h, heated to 230°C, and continuously stirred for 3h. After cooling, it is crushed and sieved through a 40 mesh sieve to obtain pre-polymer particles. The pre-polymer particles are dried under vacuum conditions at 30Pa, 110°C for 30min, heated to 140°C for 30min, and heated to 200°C for 10h to prepare a bio-based hydrophobic modified polyester. The bio-based hydrophobic modified polyester and hexagonal boron nitride are uniformly mixed in a mass ratio of 1:0.07, added to a screw extruder for extrusion, pelletization and drying, and then spun by single screw melting extrusion under the conditions of screw temperature 215°C, spinning box temperature 210°C, metering pump speed 15r / min and winding speed 400m / min, stretched and set to prepare a heat-conducting hydrophobic fiber; (2) Sodium alginate and deionized water were mixed evenly at a mass ratio of 1:35, stirred at 300 r / min for 5 h at 27 °C, and allowed to stand for degassing for 18 h to obtain sodium alginate spinning solution; silver nitrate powder with a mass fraction of 2% of the dry weight of sodium alginate was added to the sodium alginate spinning solution, and stirred at 300 r / min for 1.5 h at 27 °C in the dark to obtain silver nitrate sodium alginate mixture; anhydrous calcium chloride, ascorbic acid and deionized water were mixed at a mass ratio of 1:0.2:60, and stirred at 300 r / min for 2 h at 27 °C to obtain calcium chloride composite solution; the silver nitrate sodium alginate mixture was squeezed into the calcium chloride composite solution through a 200 μm injection pump; the obtained fiber was taken out, washed with deionized water 4 times, and dried to obtain seaweed fiber loaded with nano-silver particles; (3) A bio-based cooling fabric is made by weaving thermally conductive hydrophobic fiber with a yarn linear density of 450 dtex and seaweed fiber loaded with nano-silver particles with a yarn linear density of 90 dtex in a rib-type composite weave at a mass ratio of 1:0.3 using a horizontal loom.

[0047] Comparative Example 26: A method for preparing a bio-based cooling fabric includes the following preparation steps: (1) In a nitrogen atmosphere, furan dicarboxylic acid, octafluoro-1,6-hexanediol and antimony acetate were mixed evenly in a molar ratio of 1:1.4:0.04. The mixture was stirred at 180°C and 300 r / min for 4 h. The pressure was uniformly reduced to 50 Pa within 1 h, the temperature was raised to 230°C, and the stirring was continued for 3 h. After cooling, the mixture was pulverized and passed through a 40-mesh sieve to obtain prepolymer particles. Under vacuum conditions, the prepolymer particles were dried at 30 Pa and 110°C for 30 min, then heated to 140°C for 30 min, and then heated to 200°C for 10 h to obtain a bio-based hydrophobic modified polyester. Hexagonal boron nitride powder and γ-mercaptopropyl Trimethoxysilane, anhydrous ethanol, and deionized water were mixed in a mass ratio of 1:0.02:70:7 and stirred at 60℃ and 300 r / min for 24 h. After centrifugation and washing with deionized water, the mixture was dried at 80℃ for 8 h to obtain modified boron nitride. Bio-based hydrophobic modified polyester and modified boron nitride were mixed evenly in a mass ratio of 1:0.07 and added to a screw extruder for extrusion, pelletizing, and drying. The mixture was then melt-extruded through a single screw and spun under the conditions of screw temperature 215℃, spinning box temperature 210℃, metering pump speed 15 r / min, and winding speed 400 m / min. After stretching and shaping, thermally conductive hydrophobic fibers were obtained. (2) uniformly mix sodium alginate and deionized water in a mass ratio of 1:35, stir at 27°C and 300 r / min for 5 h, and stand for 18 h to remove bubbles to prepare a sodium alginate spinning solution; add silver nitrate powder with a mass fraction of 2% of the dry weight of sodium alginate to the sodium alginate spinning solution, stir at 27°C and 300 r / min for 1.5 h in the dark to prepare a silver nitrate-sodium alginate mixture; mix anhydrous calcium chloride, ascorbic acid, and deionized water in a mass ratio of 1:0.2:60, stir at 27°C and 300 r / min for 2 h to prepare a calcium chloride composite solution; extrude the silver nitrate-sodium alginate mixture through a 200-μm pore size syringe pump into the calcium chloride composite solution; take out the obtained fiber, wash it with deionized water 4 times, dry it, and prepare a silver nanoparticle-loaded seaweed fiber; (3) use a weft knitting machine to perform rib-type composite weaving of a heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and a silver nanoparticle-loaded seaweed fiber with a yarn linear density of 90 dtex in a mass ratio of 1:0.3 to prepare a bio-based cool fabric.

[0048] Comparative Example 27: A preparation method of a bio-based cool fabric includes the following preparation steps: (1) uniformly mix furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid, and antimony acetate in a molar ratio of 1:1.4:0.5:0.04, stir at 180°C and 300 r / min for 4 h, uniformly reduce the pressure to 50 Pa within 1 h, continue to stir at 230°C for 3 h, cool, crush, and pass through a 40-mesh sieve to obtain pre-polymer particles; under vacuum conditions, dry the pre-polymer particles at 30 Pa, 110°C for 30 min, increase the temperature to 140°C and dry for 30 min, and increase the temperature to 200°C and dry for 10 h to prepare a bio-based hydrophobically modified polyester; mix hexagonal boron nitride powder, γ-mercaptopropyltrimethoxysilane, anhydrous ethanol, and deionized water in a mass ratio of 1:0.02:70:7, stir at 60°C and 300 r / min for 24 h, centrifugally wash with deionized water, and dry at 80°C for 8 h to prepare modified boron nitride; uniformly mix the bio-based hydrophobically modified polyester and the modified boron nitride in a mass ratio of 1:0.07, add them to a screw extruder for extrusion, pelletization, and drying, and then perform melt extrusion through a single-screw extruder under the following conditions: screw temperature 215°C, spinning box temperature 210°C, metering pump speed 15 r / min, and winding speed 400 m / min, spin, stretch, and set to prepare a heat-conductive hydrophobic fiber; (2) The sodium alginate and deionized water were mixed uniformly at a mass ratio of 1:35, stirred at 27°C and 300 r / min for 5 h, and then left to stand for 18 h to remove bubbles to prepare a sodium alginate spinning solution; the anhydrous calcium chloride, deionized water and deionized water were mixed at a mass ratio of 1:0.2:60, stirred at 27°C and 300 r / min for 2 h to prepare a calcium chloride composite solution; the sodium alginate spinning solution was extruded into the calcium chloride composite solution through a 200-μm pore size syringe pump; the obtained fiber was taken out, washed with deionized water for 4 times, and dried to prepare a seaweed fiber; (3) The heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex and the seaweed fiber with a yarn linear density of 90 dtex were compounded by rib weaving at a mass ratio of 1:0.3 by using a horizontal weaving machine to prepare a bio-based cool fabric.

[0049] Comparative Example 28: A preparation method of a bio-based cool fabric, comprising the following preparation steps: (1) In a nitrogen atmosphere, furandicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate were uniformly mixed at a molar ratio of 1:1.4:0.5:0.04, stirred at 180°C and 300 r / min for 4 h, uniformly reduced to 50 Pa in 1 h, and then heated to 230°C for continuous stirring for 3 h. After cooling, the mixture was crushed and sieved through a 40-mesh sieve to obtain pre-polymer particles. The pre-polymer particles were dried under vacuum conditions at 30 Pa, 110°C for 30 min, heated to 140°C for 30 min, and then heated to 200°C for 10 h to prepare a bio-based hydrophobic modified polyester. Hexagonal boron nitride powder, γ-mercaptopropyltrimethoxysilane, anhydrous ethanol and deionized water were mixed at a mass ratio of 1:0.02:70:7, stirred at 60°C and 300 r / min for 24 h, washed with deionized water by centrifugation, and dried at 80°C for 8 h to prepare modified boron nitride. The bio-based hydrophobic modified polyester and the modified boron nitride were uniformly mixed at a mass ratio of 1:0.07, added to a screw extruder for extrusion, pelletization and drying, and then spun by single-screw melt extrusion under the conditions of a screw temperature of 215°C, a spinning box temperature of 210°C, a metering pump speed of 15 r / min and a winding speed of 400 m / min, stretched and set to prepare a heat-conductive hydrophobic fiber; (2) The heat-conductive hydrophobic fiber with a yarn linear density of 450 dtex was woven by using a horizontal weaving machine to prepare a bio-based cool fabric.

[0050] Test Example 1: Determination of optimal conditions of bio-based hydrophobic modified polyester (amount of itaconic acid added, amount of antimony acetate added, reaction temperature and reaction time) Test method: Analyzed by double bond content, according to the standard GB / T601-00 and GB1676-81 using iodine value titration method. Accurately weigh 0.5g bio-based hydrophobically modified polyester dissolved in 20mL dimethylacetamide, add 30mL Weishen reagent; the mixed solution is placed in 25℃ environment for 24 hours; then add 20mL 10% potassium iodide solution, fully oscillate and mix, then stand for 5min; wash the inner wall of the reaction bottle with 100mL distilled water; titrate with 0.1mol / L sodium thiosulfate standard solution until the solution changes from red-brown to light yellow, add 2mL starch indicator, the solution turns blue, continue to titrate until the blue color disappears, record the volume of sodium thiosulfate consumed V1. Parallel blank experiment, record the volume of sodium thiosulfate consumed V0. The results are shown in Table 1.

[0051] Iodine value (g / 100g) = [(V1-V0) x C x M x 100] / m; Double bond density (mmol / g) = iodine value / 12.69 C represents the concentration of sodium thiosulfate (mol / L); M represents the molecular weight of iodine (126.9g / mol); m represents the mass of the sample.

[0052] Table 1

[0053] It can be found by comparing Example 2 and Comparative Examples 1-4 that when the molar ratio of itaconic acid to furandicarboxylic acid is 0.5, the double bond density is the highest. Itaconic acid is the only source of double bonds in bio-based hydrophobically modified polyester. When the amount of itaconic acid is too low, the source of double bonds is insufficient, and the double bond density decreases. When the amount of itaconic acid is too high, the excess itaconic acid causes end group imbalance, the molecular weight decreases, and side reactions are initiated, resulting in a decrease in double bond density. Therefore, the optimal amount of itaconic acid is 0.5 times the molar amount of furandicarboxylic acid.

[0054] It can be found by comparing Example 2 and Comparative Examples 5-8 that when the molar ratio of antimony acetate to furandicarboxylic acid is 0.04, the double bond retention rate is optimal. Too low catalyst addition results in incomplete polycondensation, and double bonds are not fully incorporated into the chain segment. When the amount of antimony acetate is too high, excess antimony ions catalyze double bond isomerization and oxidative degradation, destroying double bond stability and reducing double bond density. Therefore, the optimal amount of antimony acetate is 0.04 times the molar amount of furandicarboxylic acid.

[0055] It can be found by comparing Example 2 and Comparative Examples 9-12 that when the reaction temperature during melt polycondensation is 230℃, the double bond density is the highest. When the temperature is lower than 230℃, the polycondensation rate is insufficient, the molecular weight does not meet the standard, and the double bond density is low. When the temperature is too high, thermal degradation leads to double bond loss and increased oxidation. Therefore, the optimal reaction temperature is 230℃.

[0056] It can be found by comparing Example 2 and Comparative Examples 13-16 that the double bond density reaches the equilibrium value when the melt polycondensation time is 3h. The polycondensation is not complete when the reaction time is too short, and the double bond density is low; increasing the reaction time accelerates the thermal isomerization of double bonds due to the prolonged exposure to high temperature. Therefore, the optimal reaction time is controlled to be 3h.

[0057] Therefore, the optimal addition amount of itaconic acid is 0.5 times the molar amount of furandicarboxylic acid, the optimal addition amount of antimony acetate is 0.04 times the molar amount of furandicarboxylic acid, the reaction temperature is 230℃, and the reaction time is 3h, which are the optimal selection, i.e., the reaction conditions of Example 2.

[0058] Test Example 2 Determination of the optimal addition amount of modified boron nitride Test method: The thermal resistance, CLO value, heat retention rate, and heat transfer coefficient of the bio-based cool fabric were tested according to GB / T11048-2008 "Textiles-Physiological Comfort-Heat Resistance and Moisture Resistance-Test Method Under Steady State Conditions", and the bio-based cool fabric was cut into a 35cm×35cm sample and tested in turn. The results are shown in Table 2.

[0059]

[0060] It can be found by comparing Example 2 and Comparative Examples 17-20 that when the addition amount of modified boron nitride is 0.07 times the mass of the bio-based hydrophobic modified polyester, the bio-based cool fabric has the best thermal conductivity. The smaller the thermal resistance, CLO value, and heat retention rate, and the larger the heat transfer coefficient, the better the thermal conductivity of the fabric sample. When the addition amount is too low, the filler is uniformly dispersed, but the isolated boron nitride particles do not form a continuous thermal conduction network, and the thermal conductivity is poor; when the addition amount is too high, the excess modified boron nitride agglomerates in the screw extrusion, destroying the thermal conduction path. Therefore, the optimal addition amount of modified boron nitride is controlled to be 0.07 times the mass of the bio-based hydrophobic modified polyester.

[0061] Test Example 3 Determination of the optimal ratio of the thermal conductivity hydrophobic fiber and the nanosilver particle loaded seaweed fiber Test method: The moisture absorption and moisture transfer performance were determined, and the upper and lower wetting times, upper and lower water absorption rates, and one-way transfer index of the bio-based cool fabric were tested according to GB / T21655.2-2009 "Textiles-Evaluation of the Moisture Management Properties-Part 2: Dynamic Moisture Transfer Method". The bio-based cool fabric was cut into a 10cm×10cm sample. A NaCl solution with a mass concentration of 9g / L was prepared to simulate human sweat. The results are shown in Table 3.

[0062] Table 3

[0063] It can be found by comparing Example 2 and Comparative Examples 21-24 that the optimal ratio of the heat-conductive hydrophobic fiber to the seaweed fiber loaded with nano-silver particles is 1:0.3 in mass ratio. When the ratio of the seaweed fiber loaded with nano-silver particles is too low, the content of the seaweed fiber is insufficient, and the capillary network penetrating the fabric cannot be formed, the sweat is blocked by the hydrophobic fiber on the skin side, and cannot be transmitted to the hydrophilic surface, and the one-way moisture transfer efficiency is low; when the ratio of the seaweed fiber loaded with nano-silver particles is too high, the hydrophilic component is overloaded, and the hydrophobic barrier function is destroyed, and after the external environmental moisture is absorbed by the hydrophilic fiber, it is reversely penetrated to the skin along the same channel. Therefore, the optimal ratio of the heat-conductive hydrophobic fiber to the seaweed fiber loaded with nano-silver particles is controlled to be 1:0.3 in mass ratio.

[0064] Test Example 4: Thermal conductivity, moisture conductivity and antibacterial performance test Thermal conductivity test method: the bio-based cool fabric obtained in each example and the materials of Comparative Examples 25-28 are tested for heat transfer coefficient according to GB / T11048-2008 “Textiles-Physiological Comfort-Resistance to Heat and Moisture-Test under Steady-state Conditions”.

[0065] Moisture conductivity test method: the bio-based cool fabric obtained in each example and the materials of Comparative Examples 25-28 are tested for one-way moisture transfer index according to GB / T21655.2-2009 “Textiles-Evaluation of the Moisture Management Properties-Part 2: Dynamic Moisture Transfer Method”.

[0066] Antibacterial performance test method: the bio-based cool fabric obtained in each example and the materials of Comparative Examples 25-28 are tested for antibacterial performance according to GB / T20944.3—2008 “Textiles-Evaluation of Antibacterial Properties-Part 3: Oscillation Method”, and the test bacteria are Staphylococcus aureus and Escherichia coli, respectively.

[0067] Bacteriostatic rate=(W t -Q t ) / W t ; W t is the viable bacteria of the control sample (CFU / mL); Q t is the viable bacteria of the sample (CFU / mL).

[0068] The results are shown in Table 4.

[0069] Table 4

[0070] It can be found from the experimental data comparison of Examples 1-3 and Comparative Examples 25-28 in Table 4 that the bio-based cool fabric prepared by the present application has good thermal conductivity, moisture conductivity and antibacterial performance.

[0071] It can be found by comparing Examples 1-3 and Comparative Example 25 that the modification of hexagonal boron nitride with γ-mercaptopropyltrimethoxysilane changes the surface properties of boron nitride through chemical modification, making it easier and more stable to disperse in a hydrophobic polyester matrix, and the introduced mercapto group reacts with the double bond in the bio-based hydrophobic modified polyester, significantly enhancing the interfacial bonding force between the hexagonal boron nitride filler and the polyester matrix, greatly improving the thermal conductivity efficiency.

[0072] It can be found by comparing Examples 1-3 and Comparative Example 26 that the addition of itaconic acid during the preparation of bio-based hydrophobic modified polyester causes thiol-ene click chemistry between the unsaturated double bond of itaconic acid and the mercapto group on the surface of modified boron nitride, forming a polyester-boron nitride covalent cross-linked network, greatly improving the interfacial bonding force between the hexagonal boron nitride filler and the polyester matrix, and significantly enhancing the thermal conductivity efficiency.

[0073] It can be found by comparing Examples 1-3 and Comparative Example 27 that the addition of silver nitrate during the preparation of seaweed fiber provides efficient and durable antibacterial performance for bio-based coolness. Silver nitrate as a silver source is reduced in situ in the subsequent ascorbic acid-containing coagulation bath to generate high-antibacterial nano-silver particles inside and on the surface of seaweed fiber. Nano-silver kills a variety of microorganisms through multiple pathways such as contact destruction, production of active oxygen, and metabolic interference.

[0074] It can be found by comparing Examples 1-3 and Comparative Example 28 that when preparing bio-based cool fabric, the thermal type hydrophobic fiber and the seaweed fiber loaded with nano-silver particles are woven through ribbing to produce a one-way moisture absorption and moisture transfer effect. The skin contact surface (hydrophobic layer) of the fabric quickly absorbs sweat on the surface of human skin while taking away part of the heat, and then the sweat evaporates and the heat dissipates through the water guide layer one-way to the non-skin contact surface (hydrophilic layer) of the fabric, thereby achieving coolness.

Claims

1. A bio-based cooling fabric, characterized in that, The bio-based cooling fabric is made by rib-type composite weaving of thermally conductive hydrophobic fibers and seaweed fibers loaded with nano-silver particles in a specific mass ratio.

2. The bio-based cooling fabric according to claim 1, characterized in that, The thermally conductive hydrophobic fiber is prepared by copolymerization of furanyl dicarboxylic acid, octafluoro-1,6-hexanediol, and itaconic acid, followed by reaction with modified boron nitride and melt spinning.

3. The bio-based cooling fabric according to claim 2, characterized in that, The modified boron nitride was prepared by reacting γ-mercaptopropyltrimethoxysilane with hexagonal boron nitride powder.

4. The bio-based cooling fabric according to claim 1, characterized in that, The loaded silver nanoparticle seaweed fiber is prepared by in-situ reduction of sodium alginate spinning solution containing silver nitrate into a calcium chloride composite solution containing ascorbic acid.

5. A method for preparing a bio-based cooling fabric, characterized in that, The preparation steps include the following: (1) In a nitrogen atmosphere, furanyl dicarboxylic acid, octafluoro-1,6-hexanediol, itaconic acid and antimony acetate are mixed evenly in a molar ratio of 1:(1.2~1.6):(0.3~0.7):(0.02~0.06). The mixture is stirred at 160~200℃ and 200~400r / min for 2~4h. The pressure is uniformly reduced to 50Pa within 0.5~1.5h, the temperature is raised to 210~250℃, and stirring is continued for 1~5h. After cooling, the mixture is pulverized and passed through a 30~60 mesh sieve to obtain prepolymer particles. Under vacuum conditions, the prepolymer particles are dried at 20~40Pa and 100~120°C for 20~40min, then heated to 130~150°C for 20~40min, and then heated to 180~180°C for 180~120°C. Bio-based hydrophobic modified polyester was prepared by drying at 0~220°C for 8~12h; hexagonal boron nitride powder, γ-mercaptopropyltrimethoxysilane, anhydrous ethanol, and deionized water were mixed at a mass ratio of 1:(0.01~0.03):(60~80):(5~10), stirred at 50~70°C and 200~400r / min for 20~28h, washed by centrifugation with deionized water, and dried at 70~90°C for 6~10h to obtain modified boron nitride; bio-based hydrophobic modified polyester and modified boron nitride were mixed evenly at a mass ratio of 1:(0.05~0.09), added to a screw extruder for extrusion, pelletizing, drying, and then melt-extruded by a single screw, melt-spun, stretched and shaped to obtain thermally conductive hydrophobic fiber; (2) Sodium alginate and deionized water are mixed evenly at a mass ratio of 1:20~50, stirred at 25~30℃ and 200~400 r / min for 4~6 h, and allowed to stand for degassing for 12~24 h to obtain sodium alginate spinning solution; silver nitrate powder with a mass fraction of 0.5%~3% of the dry weight of sodium alginate is added to the sodium alginate spinning solution, and stirred at 25~30℃ and 200~400 r / min for 1~2 h in the dark to obtain silver nitrate sodium alginate mixture; anhydrous calcium chloride, ascorbic acid, and deionized water are mixed at a mass ratio of 1:(0.1~0.3):(50~70), and stirred at 25~30℃ and 200~400 r / min for 1~2 h to obtain a silver nitrate sodium alginate mixture; anhydrous calcium chloride, ascorbic acid, and deionized water are mixed at a mass ratio of 1:(0.1~0.3):(50~70), and stirred at 25~30℃ and 200~400 r / min for 1~2 h to obtain a silver nitrate sodium alginate mixture. A calcium chloride composite solution was prepared by stirring at r / min for 1-3 h; a mixture containing silver nitrate and sodium alginate was injected into the calcium chloride composite solution through an injection pump with a pore size of 100-300 μm; the resulting fibers were taken out, washed with deionized water 3-5 times, and dried to obtain seaweed fibers loaded with silver nanoparticles. (3) A thermally conductive hydrophobic fiber with a yarn linear density of 400~500dtex and an algae fiber loaded with nano-silver particles with a yarn linear density of 80~100dtex are woven in a rib pattern at a mass ratio of 1:0.1~0.5 to obtain a bio-based cooling fabric.

6. The method for preparing a bio-based cooling fabric according to claim 5, characterized in that, The reaction process of the bio-based hydrophobic modified resin in step (1) is as follows:

7. The method for preparing a bio-based cooling fabric according to claim 5, characterized in that, The hexagonal boron nitride powder in step (1) has a purity of ≥99.9% and a particle size of 1~2μm.

8. The method for preparing a bio-based cooling fabric according to claim 5, characterized in that, The melt spinning method in step (1) is as follows: melt extrusion by a single screw, spinning under the conditions of screw temperature 200~230℃, spinning box temperature 200~220℃, metering pump speed 10~20r / min, and winding speed 350~450m / min, stretching and shaping to obtain thermally conductive hydrophobic fiber.

9. The method for preparing a bio-based cooling fabric according to claim 5, characterized in that, In step (2), sodium alginate, silver nitrate, anhydrous calcium chloride, and ascorbic acid are all of analytical grade.

Images