Preparation method of outdoor windproof wool blended fabric

Abstract

This invention discloses a method for preparing an outdoor windproof wool blended fabric in the field of fabric technology. (1) Wool blended yarn is used as warp and weft threads to obtain a wool blended fabric through weaving; (2) Using the wool blended fabric as the outer and inner layers, multiple heat-insulating yarns are sewn through the outer and inner layers in a matrix pattern, knotted at the through-holes, and coated with a hot melt adhesive mixed with silane coupling agent-modified far-infrared ceramic powder at the knotted points; (3) Using the outer layer as the receiving substrate, PVDF spinning solution is electrospun onto the surface of the outer layer to form a PVDF micro / nano fiber membrane, and using the inner layer as the receiving substrate, PAN spinning solution is electrospun onto the surface of the inner layer to form a PAN hydrophilic fiber membrane; (4) The obtained fabric is then subjected to hot pressing treatment. This invention achieves a synergistic improvement in windproof, moisture-permeable, heat-storing, and mechanical properties, meeting the comprehensive usage requirements of outdoor windproof fabrics.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a method for preparing an outdoor windproof wool blend fabric. Background Technology

[0002] Outdoor environments are complex and changeable, requiring fabrics to simultaneously meet multiple performance requirements, including windproof, breathable, and warm properties, to cope with the drop in perceived temperature caused by wind chill and the discomfort caused by sweat buildup during exercise. Wool fibers possess natural warmth, moisture absorption, and comfort, making them an ideal material for outdoor clothing. However, traditional wool blend fabrics have the following problems: insufficient windproof performance, requiring post-treatment with coatings or composite films, sacrificing the natural breathability of wool; limited warmth retention, relying solely on the static air layer of the fiber itself for insulation, lacking an active heat storage mechanism; and a single or double-layer composite fabric structure, failing to create a functional gradient of windproof, heat storage, and moisture wicking, thus unable to meet the dynamic thermal and moisture management needs of high-intensity outdoor activities. The main technical routes to achieve the windproof and breathable functions of fabrics include the following categories: (1) By increasing the yarn count and fabric tightness to reduce breathability and achieve windproof effect, but there is an essential contradiction between windproof and breathable. The tighter the fabric, the lower the breathability, but the breathability also decreases, and it is easy to feel stuffy when wearing it; (2) Coating the fabric surface with polyurethane (PU), polytetrafluoroethylene (PTFE) microporous membrane or thermoplastic polyurethane (TPU) film to achieve windproof and breathable through microporous structure or hydrophilic groups. Coated products generally have the disadvantages of hard hand feel, not breathable, and stuffy when worn, and the thickness of the composite membrane limits the fit with thin fabrics; (3) Achieving waterproof and breathable balance through electrospinning nanofiber membrane technology, but existing technologies focus more on the performance optimization of the membrane itself and lack the collaborative design with the overall structure of the fabric (such as the thermal insulation layer and heat storage layer), resulting in a single function.

[0003] In summary, existing outdoor windproof fabrics still have significant shortcomings in terms of balancing windproofness and moisture permeability, the durability of far-infrared heat storage, and the stability of interlayer structure. There is an urgent need to develop a new type of outdoor windproof wool blend fabric that combines excellent windproofness, high-efficiency moisture permeability, long-lasting far-infrared heat storage, and structural stability. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing an outdoor windproof wool blend fabric in order to solve the problems of the prior art.

[0005] The present invention achieves the above objectives through the following technical solutions: As a first aspect of the present invention, a method for preparing an outdoor windproof wool blend fabric is provided, comprising the following steps: (1) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft; (2) Using the wool blended fabric prepared in step (1) as the outer and inner fabrics, multiple heat-insulating yarns are sewn through the outer and inner fabrics in a matrix, and the through-holes are knotted and fixed. Hot melt adhesive mixed with silane coupling agent modified far-infrared ceramic powder is applied to the knotted area. (3) Using the outer fabric as the receiving substrate, the PVDF spinning solution is loaded into a syringe with a needle for electrospinning to form a PVDF micro / nano fiber membrane on the surface of the outer fabric. Using the inner fabric as the receiving substrate, the PAN spinning solution is loaded into a syringe with a needle for electrospinning to form a PAN hydrophilic fiber membrane on the surface of the inner fabric. (4) After the obtained fabric is subjected to hot pressing treatment, the outdoor windproof wool blend fabric can be obtained.

[0006] As a further technical solution of the present invention, in step (1), the wool blended yarn is a polyester / wool composite yarn, and the polyester / wool composite yarn is woven by mixing one 100-150D polyester yarn and one 16-20S wool yarn in a 1:1 ratio.

[0007] As a further technical solution of the present invention, in step (2), the warm-keeping yarn is made by first melt extrusion granulation of 70-90 parts by weight of polyester masterbatch, 10-20 parts by weight of far-infrared masterbatch and 1-5 parts by weight of antibacterial particles, and then melt spinning. The far-infrared masterbatch is made by using high-temperature activated far-infrared ceramic powder as raw material, adding propylene glycol, water glass and surfactant, dispersing evenly to obtain a slurry, mixing the slurry with polyester chips at a mass ratio of 40:100, and then granulating the mixture through a granulator to obtain the far-infrared masterbatch.

[0008] As a further technical solution of the present invention, in step (2), the amount of silane coupling agent modified far-infrared ceramic powder added is 2-4% of the mass of hot melt adhesive.

[0009] As a further technical solution of the present invention, in step (3), the preparation method of the PVDF micro / nanofiber membrane is as follows: the polymer PVDF is ultrasonically dissolved in the solvent DMF to obtain a PVDF spinning solution with a mass fraction of 10-15%. The PVDF spinning solution is loaded into a syringe with a needle for electrospinning. The injection speed is controlled at 1-3 mL / h, the voltage is 25-30 kV, the temperature is 23-25℃, the relative humidity is 40-45%, the receiving distance is 22-24 cm, and the spinning time is 2-3 h to obtain the PVDF micro / nanofiber membrane.

[0010] As a further technical solution of the present invention, in step (3), the preparation method of the PAN spinning solution is as follows: PAN, silane coupling agent modified SiO2 and tannic acid are ultrasonically dispersed in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic layer spinning solution, wherein the mass fraction of PAN is 12-15%, the mass fraction of silane coupling agent modified SiO2 is 1.5-2%, and the mass fraction of tannic acid is 1-2%.

[0011] As a further technical solution of the present invention, the preparation method of the PAN hydrophilic fiber membrane is as follows: The PAN spinning solution is loaded into a syringe with a needle for electrospinning, the temperature is controlled at 28-30℃, the relative humidity is controlled at 85-95%, the infusion rate is controlled at 1-3mL / h, the voltage is controlled at 25-30kV, the receiving distance is controlled at 22-24cm, and the electrospinning time is controlled at 2-4h, so as to form a PAN hydrophilic fiber membrane on the surface of the PVDF micro / nanofiber membrane that has been pretreated by plasma.

[0012] As a further technical solution of the present invention, the process parameters of the hot pressing treatment are: temperature 100-110℃, pressure 2-3 kg / cm². 2 The hot pressing time is 15-30 seconds.

[0013] As a second aspect of the present invention, an outdoor windproof wool blend fabric prepared by the preparation method described in any one of the above claims is provided. The beneficial effects of this invention are as follows: The outer fabric of this invention is prepared by electrospinning to form a PVDF micro / nanofiber membrane, which has hydrophobic properties. The inner fabric is formed by forming a PAN hydrophilic fiber membrane, which also has hydrophobic properties. Therefore, an asymmetric gradient structure of outer hydrophobic and inner hydrophilic is constructed, which gives the fabric excellent windproofness and high moisture permeability. The fabric has one-way moisture-wicking properties, with the outer layer being windproof and water-resistant and the inner layer being hydrophilic and moisture-wicking, forming a wearing microenvironment of inner moisture and outer dryness, which significantly improves outdoor comfort.

[0014] This invention uses a matrix-like arrangement of thermal insulation yarns that runs through the inner and outer layers of fabric. At the knots, hot melt adhesive is incorporated into far-infrared ceramic powder modified with silane coupling agent to form a three-dimensional heat storage network combining lines and points. This significantly improves the far-infrared emission performance of the fabric. In addition, the thermal insulation yarns are stitched together in a matrix pattern between the inner and outer layers of fabric to form microcavities, which retains heat storage space and maintains moisture channels, achieving a synergistic improvement in moisture permeability and heat storage performance.

[0015] This invention involves sewing and knotting thermal insulation yarns in a 1cm x 1cm matrix between the inner and outer fabric layers. Simultaneously, hot melt adhesive is used to reinforce the bond at the knots, followed by heat pressing to form a sandwich composite structure. This strengthens the fabric structure, improves its tensile properties, enhances the mechanical properties of outdoor fabrics, and maintains excellent wearability. Detailed Implementation

[0016] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above content.

[0017] In the following embodiments, The wool blended yarn is a polyester / wool composite yarn. The polyester / wool composite yarn can be woven by mixing one 100-150D polyester yarn and one 16-20S wool yarn in a 1:1 ratio. More preferably, the polyester / wool composite yarn can be woven by mixing one 150D polyester yarn and one 20S wool yarn in a 1:1 ratio.

[0018] The wool blend fabric has a warp and weft density of 200T and is a plain weave fabric.

[0019] The antibacterial particles are nano-zinc oxide.

[0020] The process parameters for melt spinning are as follows: the spinneret for melt spinning has 32 round holes with a diameter of 0.4 mm; the winding speed is 800 m / min and the melt index is 35 g / 10 min.

[0021] The high-temperature activation method for far-infrared ceramic powder is as follows: far-infrared ceramic powder and potassium nitrate are mixed at a mass ratio of 10:1 and then activated at 250℃ for 3 hours. The far-infrared ceramic powder (particle size of about 0.2μm) was purchased from Xu'ang Mining.

[0022] The preparation method of silane coupling agent (KH-550) modified far-infrared ceramic powder is as follows: add silane coupling agent KH-550 to ethanol / deionized water (1:9, v / v), the amount of which is 5% of the mass of far-infrared ceramic powder. Adjust the pH to 4 with hydrochloric acid or acetic acid. After ultrasonic dispersion at room temperature for 10 min, place it in a water bath at 55±5℃ and stir for 30 min to hydrolyze. Add far-infrared ceramic powder and continue ultrasonic dispersion for 30 min. Then place it in a water bath at 80℃ and stir for 3 h. After the reaction is completed, filter and wash twice with anhydrous ethanol or deionized water to remove unreacted free coupling agent. Vacuum dry or oven dry at 100℃ for 3 h to obtain silane coupling agent (KH-550) modified far-infrared ceramic powder.

[0023] Similarly, the modification method of SiO2 by alkyl coupling agent is the same as the preparation method of far-infrared ceramic powder modified by silane coupling agent (KH-550).

[0024] Far-infrared masterbatch is made by using high-temperature activated far-infrared ceramic powder as raw material, adding propylene glycol, water glass and surfactant, dispersing evenly to obtain a slurry, mixing the slurry with polyester chips at a mass ratio of 40:100, and then granulating the mixture through concentration, melting and granulation to obtain far-infrared masterbatch; the surfactant is sodium dodecyl sulfate, and the mass ratio between propylene glycol, water glass and sodium dodecyl sulfate is 2:2:4.

[0025] All materials and reagents not specified in this invention are commercially available, and all methods not specified can be performed using conventional methods.

[0026] Example 1

[0027] This embodiment provides a method for preparing an outdoor windproof wool blend fabric, including the following steps: (1) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft; (2) Using the wool blended fabric prepared in step (1) as the outer and inner layers, multiple heat-insulating yarns are sewn through the outer and inner layers in a matrix (1cm×1cm), knotted at the through-holes, and coated with hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder at the knots. The amount of silane coupling agent modified far-infrared ceramic powder added is 4% of the mass of the hot melt adhesive. The heat-retaining yarn is made from 70 parts by weight of polyester masterbatch, 10 parts by weight of far-infrared masterbatch and 5 parts by weight of nano zinc oxide. It is first melt-extruded and granulated, and then melt-spun to obtain far-infrared heat-retaining fiber.

[0028] (3) Using the outer fabric as the receiving substrate, PVDF is ultrasonically dissolved in the solvent DMF to obtain a PVDF spinning solution with a mass fraction of 10%. The PVDF spinning solution is loaded into a syringe with a needle for electrospinning. The injection speed is controlled at 1 mL / h, the voltage is 25 kV, the temperature is 25 °C, the relative humidity is 45%, the receiving distance is 24 cm, and the spinning time is 2 h to obtain a PVDF micro / nanofiber membrane. Using the inner fabric as the receiving substrate, PAN, silane coupling agent modified SiO2, and tannic acid were ultrasonically dispersed in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic spinning solution. The mass fraction of PAN was 15%, the mass fraction of silane coupling agent modified SiO2 was 1.5%, and the mass fraction of tannic acid was 2%. The PAN spinning solution was loaded into a syringe with a needle for electrospinning. The temperature was controlled at 28℃, the relative humidity at 95%, the infusion rate at 1mL / h, the voltage at 25kV, the receiving distance at 24cm, and the electrospinning time at 4h, forming a PAN hydrophilic fiber membrane on the inner fabric. (4) After hot pressing the obtained fabric, the outdoor windproof wool blend fabric can be obtained at a temperature of 110℃ and a pressure of 3kg / cm. 2 The hot pressing time is 15 seconds.

[0029] Example 2

[0030] This embodiment provides a method for preparing an outdoor windproof wool blend fabric, including the following steps: (1) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft; (2) Using the wool blended fabric prepared in step (1) as the outer and inner layers, multiple heat-insulating yarns are sewn through the outer and inner layers in a matrix (1cm×1cm), knotted at the through-holes, and coated with hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder at the knots. The amount of silane coupling agent modified far-infrared ceramic powder added is 2% of the mass of the hot melt adhesive. The heat-retaining yarn is made from 90 parts by weight of polyester masterbatch, 20 parts by weight of far-infrared masterbatch and 5 parts by weight of nano zinc oxide. It is first melt-extruded and granulated, and then melt-spun to obtain far-infrared heat-retaining fiber.

[0031] (3) Using the outer fabric as the receiving substrate, PVDF is ultrasonically dissolved in the solvent DMF to obtain a PVDF spinning solution with a mass fraction of 15%. The PVDF spinning solution is loaded into a syringe with a needle for electrospinning. The injection speed is controlled at 3 mL / h, the voltage is 30 kV, the temperature is 23℃, the relative humidity is 40%, the receiving distance is 22 cm, and the spinning time is 2 h to obtain a PVDF micro / nanofiber membrane. Using the inner fabric as the receiving substrate, PAN, silane coupling agent modified SiO2, and tannic acid were ultrasonically dispersed in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic spinning solution. The mass fraction of PAN was 12%, the mass fraction of silane coupling agent modified SiO2 was 2%, and the mass fraction of tannic acid was 1%. The PAN spinning solution was loaded into a syringe with a needle for electrospinning. The temperature was controlled at 30℃, the relative humidity at 90%, the infusion rate at 3mL / h, the voltage at 30kV, the receiving distance at 22cm, and the electrospinning time at 4h, forming a PAN hydrophilic fiber membrane on the inner fabric. (4) After hot pressing the obtained fabric, the outdoor windproof wool blend fabric can be obtained at a temperature of 100℃ and a pressure of 2kg / cm. 2 The hot pressing time is 30 seconds.

[0032] Example 3

[0033] This embodiment provides a method for preparing an outdoor windproof wool blend fabric, including the following steps: (1) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft; (2) Using the wool blended fabric prepared in step (1) as the outer and inner layers, multiple heat-insulating yarns are sewn through the outer and inner layers in a matrix (1cm×1cm), knotted at the through-holes, and coated with hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder at the knots. The amount of silane coupling agent modified far-infrared ceramic powder added is 3% of the mass of the hot melt adhesive. The heat-retaining yarn is made of 80 parts by weight of polyester masterbatch, 15 parts by weight of far-infrared masterbatch and 5 parts by weight of nano zinc oxide. It is first melt-extruded and granulated, and then melt-spun to obtain far-infrared heat-storing fiber. The spinneret for melt spinning has 32 round holes with a diameter of 0.4 mm. The winding speed is 800 m / min and the melt index is 35 g / 10 min.

[0034] (3) Using the outer fabric as the receiving substrate, PVDF is ultrasonically dissolved in the solvent DMF to obtain a PVDF spinning solution with a mass fraction of 12%. The PVDF spinning solution is loaded into a syringe with a needle for electrospinning. The injection speed is controlled at 2 mL / h, the voltage is 30 kV, the temperature is 23℃, the relative humidity is 40%, the receiving distance is 22 cm, and the spinning time is 3 h to obtain a PVDF micro / nanofiber membrane. Using the inner fabric as the receiving substrate, PAN, silane coupling agent modified SiO2, and tannic acid were ultrasonically dispersed in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic spinning solution. The mass fraction of PAN was 14%, the mass fraction of silane coupling agent modified SiO2 was 1.5%, and the mass fraction of tannic acid was 2%. The PAN spinning solution was loaded into a syringe with a needle for electrospinning. The temperature was controlled at 30℃, the relative humidity at 95%, the infusion rate at 3mL / h, the voltage at 30kV, the receiving distance at 22cm, and the electrospinning time at 3h, forming a PAN hydrophilic fiber membrane on the inner fabric. (4) After hot pressing the obtained fabric, the outdoor windproof wool blend fabric can be obtained at a temperature of 110℃ and a pressure of 3kg / cm. 2 The hot pressing time is 20 seconds.

[0035] Fabrics prepared in Examples 1-3 are known as fabrics Y-1, Y-2 and Y-3. First, the air permeability and moisture permeability of fabrics Y-1, Y-2 and Y-3 are tested.

[0036] (1) Air permeability test The air permeability test used the outer layers of fabrics Y-1, Y-2, and Y-3 as the test surfaces. Referring to the national standard (GB / T5433), the air permeability was tested using a YG461G fully automatic fabric air permeability meter. The specific experimental parameters were set as follows: ambient temperature 25℃, relative humidity 60%, pressure difference 100Pa, and air permeability area 20cm². 2 The nozzle diameter is 0.8 mm. Ten tests were performed on different parts of the fabric sample, and the average value was taken as the final air permeability data. Control fabric D-1 was set as follows: based on the preparation method of fabric Y-1, but without the preparation of PVDF micro / nanofiber membranes.

[0037] (2) Moisture permeability test The air permeability test used the inner layers of fabrics Y-1, Y-2, and Y-3 as the test surfaces. According to national standard GB / T12704.1-2009(a), an FX3180 moisture permeability measuring instrument was used to test the samples' moisture permeability. During the test, the temperature was 38℃, the humidity was 90.0%, the airflow velocity was 0.5m / s, and the test area was 28.3cm². Before testing, the test chamber needed to be pre-conditioned. After automatic conditioneding, the instrument started the moisture permeability test, automatically recording the data every hour for a total of two times. After the experiment, the moisture permeability data of the samples were manually recorded, and the average of the five sets of experimental data for each sample was used as the final data. The control fabric D-2 was set as follows: based on the preparation method of fabric Y-1, but without the preparation of the PAN hydrophilic fiber membrane.

[0038] The results are summarized in Table 1.

[0039] Secondly, the warmth retention properties of fabrics Y-1, Y-2, and Y-3 were measured: The far-infrared properties of knitted fabric samples were tested according to GB / T30127-2013 "Testing and Evaluation of Far-Infrared Properties of Textiles". The far-infrared wavelength range was 8-15 μm, the distance was 500 mm, and the far-infrared radiation temperature rise (°C) after 20 seconds of radiation was measured. The light absorption and heat storage properties of knitted fabric samples were tested according to the test method specified in GTTTM044-2014 (20-minute temperature difference = temperature of knitted fabric sample at 20 minutes - temperature of ordinary knitted fabric at 20 minutes). The average of 5 sets of experimental data for each sample was used as the final data. The results are shown in Table 1.

[0040] Finally, the tensile strengths of fabrics Y-1, Y-2, and Y-3 were determined: A Q800 dynamic mechanical analyzer (DMA, TA Instruments, USA) was used to perform stress-strain tests on the samples to determine their strength and elastic modulus. Samples were cut into strips of 30×10mm and placed in a tensile fixture, with one end fixed and the other end movable with the fixture. The temperature was maintained at 20℃, the frequency was set to 1Hz, and the applied stress was gradually increased from 0 at a rate of 5MPa / s. The strain changes were recorded until the sample fractured. The stress at the fracture point was taken as the tensile strength of the sample. The average of five sets of experimental data for each sample was used as the final data. The results are summarized in Table 1.

[0041] Table 1. Results Statistics Table

[0042] The results are shown in Table 1. The outer fabric of fabrics Y-1, Y-2, and Y-3 has a low breathability value, which results in excellent windproof performance on the outer side of the fabric. At the same time, the inner fabric of fabrics Y-1, Y-2, and Y-3 has excellent moisture permeability due to the PAN hydrophilic fiber membrane. The excellent one-way moisture wicking performance further enhances the wearing comfort as an outdoor fabric. In addition, the matrix setting of the heat-insulating yarn and the hot melt adhesive mixed with silane coupling agent modified far-infrared ceramic powder gives the fabric excellent far-infrared heating performance.

[0043] To further verify the impact of fabric preparation methods on fabric performance, the following comparative example was set up based on the preparation method of fabric Y-1: Comparative Example 1 This comparative example provides a method for preparing an outdoor windproof wool blended fabric. The difference between this method and the method for preparing fabric Y-1 is in step (2): using wool blended yarn for preparing the wool blended fabric, namely polyester / wool composite yarn (the weaving method can be one 150D polyester yarn and one 20S wool yarn in a 1:1 ratio to form a net), to replace the warm yarn.

[0044] Comparative Example 2 This comparative example provides a method for preparing an outdoor windproof wool blend fabric. The difference between this method and the method for preparing fabric Y-1 is in step (2): using the wool blend fabric prepared in step (1) as the outer and inner layers, multiple heat-insulating yarns are sewn through the outer and inner layers in a matrix (1cm×1cm). The through-holes are knotted and fixed, and no hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder is applied to the knotted area.

[0045] Comparative Example 3 This comparative example provides a method for preparing an outdoor windproof wool blend fabric. The difference between this method and the method for preparing fabric Y-1 is in step (2): no warm-insulating yarn is used. A hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder (the amount of silane coupling agent modified far-infrared ceramic powder is 4% of the mass of the hot melt adhesive) is applied to the side of the inner fabric facing the outer fabric, with a coating amount of 5g / m. 3 After the outer and inner fabrics are bonded together using a hot-pressing composite process (110℃, pressure 2kg / cm²), 2 (Hot pressing time is 15s), and then proceed with subsequent processing.

[0046] Comparative Example 4 This comparative example provides a method for preparing an outdoor windproof wool blend fabric. The difference between this method and the method for preparing fabric Y-1 is that the preparation method of the PAN hydrophilic fiber membrane in step (3) is different. In this comparative example, the inner fabric was used as the receiving substrate. PAN and silane coupling agent modified SiO2 were ultrasonically dispersed in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic spinning solution. The mass fraction of PAN was 15% and the mass fraction of silane coupling agent modified SiO2 was 1.5%. The PAN spinning solution was loaded into a syringe with a needle for electrospinning. The temperature was controlled at 28°C, the relative humidity at 95%, the infusion rate at 1 mL / h, the voltage at 25 kV, the receiving distance at 24 cm, and the electrospinning time at 4 h, forming a PAN hydrophilic fiber membrane on the inner fabric.

[0047] Comparative Example 5 This comparative example provides a method for preparing an outdoor windproof wool blend fabric, including the following steps: (1) Preparation of unidirectional moisture-wicking fiber membrane PVDF was ultrasonically dissolved in DMF to obtain a PVDF spinning solution with a mass fraction of 10%. The PVDF spinning solution was loaded into a syringe with a needle for electrospinning. The injection rate was controlled at 1 mL / h, the voltage at 25 kV, the temperature at 25℃, the relative humidity at 45%, the receiving distance at 24 cm, and the spinning time at 2 h to obtain a PVDF micro / nanofiber membrane. (2) Using PVDF micro / nanofiber membrane as substrate, PAN, silane coupling agent modified SiO2 and tannic acid are ultrasonically dispersed in DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic layer spinning solution, wherein the mass fraction of PAN is 15%, the mass fraction of silane coupling agent modified SiO2 is 1.5%, and the mass fraction of tannic acid is 2%. The PAN spinning solution is loaded into a syringe with a needle for electrospinning. The temperature is controlled at 28℃, the relative humidity is 95%, the infusion rate is controlled at 1mL / h, the voltage is 25kV, the receiving distance is 24cm, and the electrospinning time is 4h. A PAN hydrophilic fiber membrane is formed on the PVDF micro / nanofiber membrane to obtain a unidirectional moisture-wicking fiber membrane. (3) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft. (4) Apply a hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder (the amount of silane coupling agent modified far-infrared ceramic powder is 4% of the mass of the hot melt adhesive) to one side of the wool blend fabric. The coating amount is 5g / m. 3 The PVDF micro / nanofiber membrane was composited with a unidirectional moisture-wicking fiber membrane using a hot-pressing composite process (110℃, pressure 2 kg / cm²). 2 (The hot pressing time is 15 seconds).

[0048] Comparative Example 6 This comparative example provides a method for preparing an outdoor windproof wool blend fabric, including the following steps: (1) The wool blended fabric is obtained by warping the warp yarn of fabric Y-1 warming yarn and the weft yarn of wool blended yarn, and the wool blended fabric is used as the inner and outer fabrics. (2) Apply hot melt adhesive containing silane coupling agent modified far-infrared ceramic powder (the amount of silane coupling agent modified far-infrared ceramic powder is 4% of the mass of hot melt adhesive) to the side of the inner layer fabric facing the outer layer fabric, with a coating amount of 5g / m. 3 After the outer and inner fabrics are bonded together using a hot-pressing composite process (110℃, pressure 2kg / cm²), 2 (Hot pressing time is 15s), and then follow up with the same fabric Y-1.

[0049] Fabric samples were prepared using Comparative Examples 1 and 6, and their air permeability, moisture permeability, far-infrared performance, and tensile properties were tested. The wool blend fabric prepared in step (1) of Example 1 was used as a blank control group. The mean of the five sets of experimental data for each sample was used as the final data. The results are shown in Table 2.

[0050] Table 2. Results Statistics Table

[0051] The results are shown in Table 2. Comparative Example 1, which used ordinary wool blend yarn instead of the insulating yarn, showed a decrease in both far-infrared performance and tensile properties compared to Example 1. The insulating yarn had a positive effect on improving the far-infrared performance of the fabric. Furthermore, since the mechanical properties of the insulating yarn were superior to those of the wool blend yarn, the tensile strength of Example 1 was better than that of Comparative Example 1. Comparative Example 2, which did not apply hot melt adhesive at the knots, showed a decrease in both far-infrared performance and tensile properties compared to Example 1, indicating that the silane coupling agent-modified far-infrared ceramic powder in the hot melt adhesive had a significant reinforcing effect on heat storage. Comparative Example 3, which involved direct adhesive bonding without insulating yarn, exhibited excellent breathability on the outer fabric side, but a significant decrease in moisture permeability on the inner fabric side. Despite the presence of far-infrared ceramic powder in the hot melt adhesive, the overall far-infrared performance of the fabric was inferior to that of Example 1.

[0052] Comparative Example 4, containing no tannins in its PAN hydrophilic fiber membrane, exhibited decreased moisture permeability compared to Example 1, demonstrating the significant effect of tannins in enhancing hydrophilic wicking. Comparative Example 5 changed the fabric from a double-layer to a single-layer structure, and simultaneously prepared a unidirectional moisture-wicking fiber membrane by combining a PVDF micro / nanofiber membrane with a PAN hydrophilic fiber membrane. This unidirectional moisture-wicking fiber membrane was then bonded to a wool blend fabric using hot melt adhesive. It can be seen that the outer air permeability was not significantly different from Example 1, but the inner moisture permeability was significantly lower than in Example 1. Furthermore, its far-infrared performance and tensile properties were also lower than in Example 1. Comparative Example 6 used a thermal insulation yarn as warp yarn, blended with wool yarn to create a fabric, which was then subjected to the same subsequent treatment as fabric Y-1. Lacking the hollow layer constructed by the thermal insulation yarn in the middle, the fabric's moisture permeability was relatively lower, the 20-minute temperature difference decreased, and the fabric's heat retention was slightly reduced.

[0053] The above-described embodiments are merely examples of several implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for preparing an outdoor windproof wool blend fabric, characterized in that, Includes the following steps: (1) Wool blended fabric is obtained by weaving using wool blended yarn as warp and weft; (2) Using the wool blended fabric prepared in step (1) as the outer and inner fabrics, multiple heat-insulating yarns are sewn through the outer and inner fabrics in a matrix, and the through-holes are knotted and fixed. Hot melt adhesive mixed with silane coupling agent modified far-infrared ceramic powder is applied to the knotted area. (3) Using the outer fabric as the receiving substrate, the PVDF spinning solution is loaded into a syringe with a needle for electrospinning to form a PVDF micro / nano fiber membrane on the surface of the outer fabric. Using the inner fabric as the receiving substrate, the PAN spinning solution is loaded into a syringe with a needle for electrospinning to form a PAN hydrophilic fiber membrane on the surface of the inner fabric. (4) After the obtained fabric is subjected to hot pressing treatment, the outdoor windproof wool blend fabric can be obtained.

2. The method for preparing an outdoor windproof wool blend fabric according to claim 1, characterized in that, In step (1), the wool blended yarn is a polyester / wool composite yarn, and the polyester / wool composite yarn is woven by mixing one 100-150D polyester yarn and one 16-20S wool yarn in a 1:1 ratio.

3. The method for preparing an outdoor windproof wool blended fabric according to claim 1, characterized in that, in step (2), the warming yarn is prepared by first melt extrusion granulation and then melt spinning of 70-90 parts by weight of polyester masterbatch, 10-20 parts by weight of far-infrared masterbatch and 1-5 parts by weight of antibacterial particles; The far-infrared masterbatch is made by using high-temperature activated far-infrared ceramic powder as raw material, adding propylene glycol, water glass and surfactant, dispersing evenly to obtain a slurry, mixing the slurry with polyester chips at a mass ratio of 40:100, and then granulating the mixture through a granulator to obtain the far-infrared masterbatch.

4. The method for preparing an outdoor windproof wool blended fabric according to claim 1, characterized in that, in step (2), the amount of silane coupling agent modified far-infrared ceramic powder added is 2-4% of the mass of the hot melt adhesive.

5. The method for preparing an outdoor windproof wool blend fabric according to claim 1, characterized in that, In step (3), the preparation method of the PVDF micro / nanofiber membrane is as follows: the polymer PVDF is ultrasonically dissolved in the solvent DMF to obtain a PVDF spinning solution with a mass fraction of 10-15%. The PVDF spinning solution is loaded into a syringe with a needle for electrospinning. The injection speed is controlled at 1-3 mL / h, the voltage is 25-30 kV, the temperature is 23-25℃, the relative humidity is 40-45%, the receiving distance is 22-24 cm, and the spinning time is 2-3 h to obtain the PVDF micro / nanofiber membrane.

6. The method for preparing an outdoor windproof wool blend fabric according to claim 1, characterized in that, In step (3), the PAN spinning solution is prepared by ultrasonically dispersing PAN, silane coupling agent modified SiO2 and tannic acid in a DMF / DMSO solvent with a volume ratio of 9:1 to obtain a hydrophilic spinning solution, wherein the mass fraction of PAN is 12-15%, the mass fraction of silane coupling agent modified SiO2 is 1.5-2%, and the mass fraction of tannic acid is 1-2%.

7. A method for preparing an outdoor windproof wool blend fabric according to claim 1 or 6, characterized in that, The preparation method of the PAN hydrophilic fiber membrane is as follows: The PAN spinning solution is loaded into a syringe with a needle for electrospinning. The temperature is controlled at 28-30℃, the relative humidity is controlled at 85-95%, the infusion rate is controlled at 1-3mL / h, the voltage is controlled at 25-30kV, the receiving distance is controlled at 22-24cm, and the electrospinning time is controlled at 2-4h, so as to form a PAN hydrophilic fiber membrane on the surface of the inner fabric.

8. The method for preparing an outdoor windproof wool blend fabric according to claim 1, characterized in that, The hot pressing process parameters are: temperature 100-110℃, pressure 2-3 kg / cm². 2 The hot pressing time is 15-30 seconds.

9. An outdoor windproof wool blend fabric prepared by the preparation method according to any one of claims 1-8.

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