Cool fabric and preparation method thereof

Abstract

The invention relates to a cool fabric and a preparation method thereof. The cool fabric is formed by weaving cool composite yarns; the cool-feeling composite yarn is prepared by compounding submicron fibers containing nano inorganic particles and xylitol microcapsules with basic fibers. The preparation process is simple and convenient, the original production process and performance of the yarn fabric are not affected, the utilization rate of the functional additive is high, and the prepared cool fabric is good in hand feeling and excellent and lasting in cool effect.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, and specifically relates to a cooling fabric and its preparation method. Background Technology

[0002] With the improvement of living standards and the continuous development of textile technology, people not only have new requirements for the style and design of apparel textiles, but also pay more attention to the diversity of their functions. In the hot summer, especially when facing sweating and stuffiness during outdoor activities, there is an urgent need to develop cool and comfortable summer apparel fabrics, and some products with cooling and temperature-regulating functions have appeared on the market. The cooling function of summer clothing should not only provide an instant cooling sensation upon initial contact with the garment, but also a continuous cooling effect during wear. Existing cooling finishing methods, such as fabric finishing processes, often face the problem of maintaining the cooling function. Patent CN 111101373 A adds xylitol cooling finishing agent during finishing, utilizing the endothermic reaction principle of xylitol with water to obtain xylitol-cooled fabric. However, xylitol is easily soluble in water, and the cooling function of fabrics treated in this way will be somewhat lost after multiple washes. Patent CN 119020988 A uses a nano-scale cooling microcapsule formula in the finishing agent to reduce the particle size of the cooling microcapsules and increase the adsorption amount of cooling microcapsules per unit area, resulting in a more lasting cooling effect. However, the large amount of finishing agent used in the finishing process often has a certain impact on the fabric's own performance properties, such as hand feel and luster. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a cooling fabric and its preparation method, so as to overcome the defects of poor durability of cooling function and large amount of finishing agent in the prior art.

[0004] The present invention provides a cooling fabric woven from a cooling composite yarn; the cooling composite yarn is made by combining submicron fibers containing nano-inorganic particles and xylitol microcapsules with basic fibers.

[0005] Preferably, the diameter of the submicron fiber is in the range of 100 to 1000 nm, and the diameter of the base fiber is in the range of 10 to 50 μm.

[0006] Preferably, the xylitol microcapsules are prepared by emulsification and cross-linking, using sodium alginate as the wall material and xylitol as the core material.

[0007] Preferably, the sodium alginate can be compounded with either gelatin or gum arabic to serve as a wall material, further improving the structural density of the capsule wall.

[0008] Preferably, the nano-inorganic particles are inorganic particles with high thermal conductivity, including but not limited to at least one of boron nitride, zinc oxide, and titanium dioxide.

[0009] Preferably, the base fiber includes, but is not limited to, one or a mixture of several of cotton, short wool, viscose, polyester fiber or nylon fiber.

[0010] This invention provides a method for preparing the above-mentioned cooling fabric, comprising the following steps:

[0011] (1) Preparation of xylitol microcapsules;

[0012] (2) The nano-inorganic particles, xylitol microcapsules and polymer were sequentially dispersed in an organic solvent to obtain an electrospinning solution;

[0013] (3) The loosened basic fibers are fed into the carding machine to form a fiber web, and the electrospinning solution in step (2) is added to the needleless electrospinning generator for spinning. The spinning process parameters are set, and the submicron fibers containing nano-inorganic particles and xylitol microcapsules are sprayed onto and deposited on the fiber web to form a web and a strip. The cool-feeling composite yarn is obtained through the steps of drawing, roving and spinning.

[0014] (4) The cooling composite yarn obtained in step (3) is woven on a machine to produce a cooling fabric.

[0015] Preferably, the method for preparing the xylitol microcapsules in step (1) includes the following steps:

[0016] Step 1. Dissolve sodium alginate in deionized water to prepare a wall material solution; dissolve xylitol in deionized water to prepare a core material solution;

[0017] Step 2. Slowly add the core material solution to the oil phase containing the oily emulsifier to emulsify and form an emulsion; then disperse the emulsion a second time in the wall material solution containing the amphiphilic emulsifier and emulsify again;

[0018] Step 3. Add the emulsion obtained in Step 2 dropwise to the CaCl2 solution, controlling the temperature at 20–25°C and the pH at 6–7, and stir magnetically for 30–60 minutes to allow the sodium alginate to react with the CaCl2 solution. 2+ Cross-linking forms a gel shell, resulting in a xylitol microcapsule suspension; subsequently, uncross-linked Ca2+ is removed by washing with deionized water. 2+ Xylitol microcapsules were prepared by freeze-drying the surface oil phase.

[0019] Preferably, the mass concentration of the wall material solution in step 1 is 1% to 3%; and the mass concentration of the core material solution is 30% to 70%.

[0020] Preferably, the concentration of the oily emulsifier in step 2 is 1% to 5%, including but not limited to any one of sorbitan monooleate (Span 80) or glyceryl monostearate.

[0021] Preferably, the oil phase in step 2 includes, but is not limited to, any one of liquid paraffin, soybean oil, or corn oil.

[0022] Preferably, the concentration of the amphiphilic emulsifier in step 2 is 1% to 3%, including but not limited to any one of polysorbate 80 (Tween 80) or lecithin.

[0023] Preferably, the mass concentration of the CaCl2 solution in step 3 is 1% to 5%.

[0024] Preferably, the polymer in step (2) includes, but is not limited to, one or more of polyacrylonitrile, polystyrene, and polyurethane, and the organic solvent includes, but is not limited to, one of N,N-dimethylformamide (DMF) or a DMF / acetone mixture.

[0025] Preferably, the dispersion and stirring temperature in step (2) is 20 to 50°C.

[0026] Preferably, in step (2), the mass fraction of the polymer in the electrospinning solution is 8-15%, the mass fraction of the nano-inorganic particles is 10-20%, the mass fraction of the xylitol microcapsules is 8-15%, and the remainder is an organic solvent.

[0027] The electrospinning solution contains nano-inorganic particles and xylitol microcapsules. Its high thermal conductivity enhances the overall thermal conductivity of the yarn, allowing heat to dissipate quickly and efficiently to the outside, achieving a cooling effect upon contact. Substances such as xylitol and peppermint oil have natural cooling effects; xylitol has a high heat of solution and its reaction with water is significantly endothermic.

[0028] Preferably, the cooling composite yarn described in step (3) is spun by an inlaid spinning device, specifically including: a carding machine carding the basic fibers and outputting them as a web, the fiber web being conveyed by a conveyor roller and adsorbed onto the screen by a negative pressure suction device, the high-voltage generator below the fiber web being turned on, and a needleless electrospinning device spraying submicron fibers onto the fiber web, the resulting composite fiber web being obtained by passing through a gathering trumpet mouth to obtain a composite fiber strip, and then obtaining the inlaid structure cooling composite yarn through drawing, roving, and spinning processes.

[0029] Preferably, the spinning process parameters in step (3) are: fiber web conveying speed of 5-50 m / min, spinning distance of 15-20 cm, spinning voltage of 30-50 kV, ambient humidity of 20-50%, and ambient temperature of 20-25 °C.

[0030] Preferably, the weaving process in step (4) includes either machine weaving or knitting.

[0031] The present invention also provides an application of the above-mentioned cooling fabric in the preparation of summer cooling clothing.

[0032] Beneficial effects

[0033] (1) The cooling functional material of the present invention comprises nano-inorganic particles and xylitol microcapsules. Xylitol has a high heat of solution and its reaction with water is significantly endothermic, providing a continuous cooling effect after the human body sweats. By preparing xylitol into microcapsules, the problem of xylitol being easily soluble in water and the resulting poor cooling, washability, and durability of the finished fabrics is solved in existing finishing technologies.

[0034] (2) The present invention uses an inlaid spinning device to combine submicron fibers with basic fibers to prepare cool-feeling composite yarn. The preparation process is simple and does not affect the original production process and performance of the yarn fabric. The functional additives have a high utilization rate. The prepared cool-feeling yarn fabric has a good hand feel, excellent and long-lasting cool-feeling effect, and is safe and environmentally friendly. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the preparation process of xylitol microcapsules of the present invention.

[0036] Figure 2 This is a schematic diagram of the inlay spinning process of the present invention.

[0037] Figure 3 This is a scanning electron microscope image of the cooling composite yarn prepared in Example 1.

[0038] Reference numerals: 1-fiber web, 2-transfer roller, 3-negative pressure suction device, 4-net curtain, 5-high pressure generator, 6-needleless electrospinning generator, 7-submicron fiber, 8-gathering trumpet mouth. Detailed Implementation

[0039] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0040] Example 1

[0041] The method for preparing the cooling fabric in this embodiment includes the following steps:

[0042] (1) Preparation of xylitol microcapsules: Sodium alginate was dissolved in deionized water and magnetically stirred until completely dissolved to prepare a wall material solution with a mass concentration of 2%; xylitol was dissolved in deionized water to prepare a core material solution with a mass concentration of 40%; the xylitol aqueous phase was slowly added to liquid paraffin containing 3% Span 80 and subjected to high-speed shearing to form an emulsion; the above emulsion was further dispersed in a sodium alginate solution containing 2% Tween 80 and subjected to high-speed shearing to form an emulsion; the emulsion was added dropwise to a 3% CaCl2 solution and magnetically stirred for 60 min, with the temperature controlled at 25℃ and pH 6-7, to form a xylitol microcapsule suspension; uncrosslinked Ca was removed by washing with deionized water. 2+ The surface oil phase was freeze-dried to obtain xylitol microcapsules;

[0043] (2) Preparation of electrospinning solution: Nano-hexagonal boron nitride, the above-mentioned xylitol microcapsules and polyacrylonitrile are dispersed in DMF in sequence and stirred overnight at a constant temperature of 20°C to obtain electrospinning solution. The mass fraction of polyacrylonitrile in the electrospinning solution is 8%, the mass fraction of nano-hexagonal boron nitride is 15%, the mass fraction of xylitol microcapsules is 10%, and the remainder is organic solvent DMF.

[0044] (3)Use Figure 2 The inlaid spinning device shown prepares a cool-feeling composite yarn. The specific process includes: feeding the opened cotton fibers into the carding machine, the cotton fiber web 1 output by the carding machine is conveyed by the conveying roller 2 at a conveying speed of 10m / min, and the fiber web 1 is adsorbed onto the screen 4 by the negative pressure suction device 3; the electrospinning solution in step (2) is added to the needleless electrospinning generator 6 for spinning, the spinning distance is 15cm, the spinning voltage is 40kV, the ambient humidity is 25%, and the ambient temperature is 20℃; the high voltage generator 5 below the fiber web 1 is turned on, and the needleless electrospinning generator 6 sprays submicron fibers 7 containing nano-inorganic particles and xylitol microcapsules onto the fiber web 1, the two fibers are combined into a web and a strip, and the cool-feeling composite yarn is obtained through the steps of drawing, roving, and spinning.

[0045] (4) The cool-feeling composite yarn obtained in step (3) is woven on a machine and a typical knitted fabric is prepared using a circular knitting machine to obtain a cool-feeling fabric.

[0046] Figure 3 The image shows a scanning electron microscope (SEM) image of a cooling composite yarn, revealing a cross-scale mosaic composite of submicron fibers and cotton fibers.

[0047] Comparative Example 1

[0048] Comparative Example 1 served as a blank control group. Ordinary yarn of the same specifications as in Example 1 was used for weaving. Typical knitted fabrics were prepared using a circular knitting machine to obtain ordinary fabrics.

[0049] The Q-Max values ​​of the cooling sensation upon contact were measured according to the standard GB / T 35263-2017, "Test Standard for Instantaneous Cooling Sensitivity of Textiles," to quantitatively evaluate their cooling performance. The results are shown in Table 1. The cooling sensation of the fabric prepared in Example 1 according to the method of this invention is significantly better than that of the ordinary fabric woven with ordinary yarn in Comparative Example 1, and it still has good cooling performance after washing (Q-max ≥ 0.15 J / (cm²)). 2 ·s)).

[0050] Table 1. Cooling properties of the fabrics prepared in Example 1 and Comparative Example 1

[0051] Testing items Example 1 (Before washing) Example 1 (after washing with water) Comparative Example 1 Q-max 0.17 0.16 0.12

Claims

1. A cooling fabric, characterized in that, The cooling fabric is woven from cooling composite yarn; the cooling composite yarn is made by combining submicron fibers containing nano-inorganic particles and xylitol microcapsules with basic fibers.

2. The cooling fabric according to claim 1, characterized in that, The diameter of the submicron fiber ranges from 100 to 1000 nm, and the diameter of the base fiber ranges from 10 to 50 μm.

3. The cooling fabric according to claim 1, characterized in that, The xylitol microcapsules are prepared by emulsification and cross-linking using sodium alginate as the wall material and xylitol as the core material; the nano-inorganic particles are inorganic particles with high thermal conductivity, including at least one of boron nitride, zinc oxide, and titanium dioxide; the base fiber includes one or a mixture of several of cotton, short wool, viscose, polyester fiber, or nylon fiber.

4. A method for preparing the cooling fabric as described in claim 1, comprising the following steps: (1) Preparation of xylitol microcapsules; (2) The nano-inorganic particles, xylitol microcapsules and polymer were sequentially dispersed in an organic solvent to obtain an electrospinning solution; (3) The loosened basic fibers are fed into the carding machine to form a fiber web, and the electrospinning solution in step (2) is added to the needleless electrospinning generator for spinning. The spinning process parameters are set, and the submicron fibers containing nano-inorganic particles and xylitol microcapsules are sprayed onto and deposited on the fiber web to form a web and a strip. The cool-feeling composite yarn is obtained through the steps of drawing, roving and spinning. (4) The cooling composite yarn obtained in step (3) is woven on a machine to produce a cooling fabric.

5. The method for preparing the cooling fabric according to claim 4, characterized in that, The preparation method of xylitol microcapsules in step (1) includes the following steps: Step 1. Dissolve sodium alginate in deionized water to prepare a wall material solution; dissolve xylitol in deionized water to prepare a core material solution; Step 2. Slowly add the core material solution to the oil phase containing the oily emulsifier to emulsify and form an emulsion; then disperse the emulsion a second time in the wall material solution containing the amphiphilic emulsifier and emulsify again; Step 3. Add the emulsion obtained in Step 2 dropwise to CaCl2 solution, control the temperature at 20-25℃ and pH at 6-7, and stir magnetically for 30-60 minutes to form a xylitol microcapsule suspension; then wash with deionized water and freeze-dry to obtain xylitol microcapsules.

6. The method for preparing the cooling fabric according to claim 5, characterized in that, The wall material solution in step 1 has a mass concentration of 1% to 3%; the core material solution has a mass concentration of 30% to 70%; the oily emulsifier in step 2 has a concentration of 1% to 5%, including any one of sorbitan monooleate or glyceryl monostearate; the oil phase includes any one of liquid paraffin, soybean oil, or corn oil; the amphiphilic emulsifier has a concentration of 1% to 3%, including any one of polysorbate 80 or lecithin; and the CaCl2 solution in step 3 has a mass concentration of 1% to 5%.

7. The method for preparing the cooling fabric according to claim 4, characterized in that, The polymer mentioned in step (2) includes one or more of polyacrylonitrile, polystyrene, and polyurethane; the organic solvent includes one of N,N-dimethylformamide or N,N-dimethylformamide / acetone mixture.

8. The method for preparing the cooling fabric according to claim 4, characterized in that, The dispersion and stirring temperature in step (2) is 20-50℃; the mass fraction of the polymer in the electrospinning solution is 8-15%, the mass fraction of the nano-inorganic particles is 10-20%, the mass fraction of the xylitol microcapsules is 8-15%, and the remainder is organic solvent.

9. The method for preparing the cooling fabric according to claim 4, characterized in that, The cooling composite yarn described in step (3) is spun by an inlaid spinning device, specifically including: a carding machine carding the basic fibers and outputting them as a web, the fiber web being conveyed by a conveyor roller and adsorbed onto the screen by a negative pressure suction device, the high-voltage generator below the fiber web being turned on, and a needleless electrospinning device spraying submicron fibers onto the fiber web, the resulting composite fiber web being obtained by passing through a gathering trumpet mouth to obtain a composite fiber strip, and then obtaining the inlaid structure cooling composite yarn through drawing, roving, and spinning processes.

10. The method for preparing the cooling fabric according to claim 4, characterized in that, The spinning process parameters in step (3) are: fiber web conveying speed 5-50 m / min, spinning distance 15-20 cm, spinning voltage 30-50 kV, ambient humidity 20-50%, and ambient temperature 20-25 °C.

Images