A fabric and a method for making the same

Abstract

This invention discloses a fabric and its preparation method. The fabric preparation method includes the following steps: functional yarns are interwoven as warp and weft yarns respectively to obtain a fabric with a tightness greater than or equal to 70%; the functional yarns are wound into a cylindrical composite material roll by a composite material layer, and then the composite material roll is stretched along its axial direction; the composite material layer includes a first material layer and a second material layer, and the winding is performed by curling along one long side of the first material layer or the second material layer towards the other long side. The fabric and its preparation method of this invention, by winding and stretching the composite material layer to obtain the functional yarn, produce a fabric with good cooling and UV protection effects, and does not require compounding with other functional fibers, post-treatment, or coating, thus providing both good cooling and UV protection.

Description

[0001] This application is a divisional application of the invention patent application filed on November 24, 2023, with application number 202311581459.0 and invention title "A functional yarn and its preparation method and fabric". Technical Field

[0002] This invention relates to the field of textile technology, specifically to a fabric and a method for preparing the fabric. Background Technology

[0003] Existing research has shown that excessive ultraviolet radiation is harmful, leading to an increasing demand for clothing fabrics with UV protection and cooling properties. Currently, most yarns on the market offer only a single function, such as UV protection or cooling. Existing UV-protective fabrics are typically thick, unsuitable for summer use. In high-temperature environments, such clothing can feel stuffy and hot, causing excessive sweating and dehydration during prolonged wear, thus reducing the wearer's comfort. Furthermore, many existing lightweight sun-protective fabrics undergo finishing or coating processes during production, which significantly reduces their UV protection after washing. Summary of the Invention

[0004] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a fabric and its preparation method, in which the fabric woven from functional yarns has a cooling sensation directly without finishing or coating, and its UV protection function is not affected.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] One object of the present invention is to provide a method for preparing a functional yarn, comprising the following steps:

[0007] A composite material layer is obtained by stacking the first material layer and the second material layer along the thickness direction;

[0008] The composite material layers are wound to obtain a cylindrical composite material roll, wherein the composite material roll is filled with composite material layers from the inside to the outside along its radial direction;

[0009] The functional yarn is obtained by stretching the composite material roll along its axial direction;

[0010] The diameter of the cylindrical composite material roll is 1.68–2 cm, and the winding is performed along the width direction of the first or second material layer, from one side to the other. That is, the roll is made from one long side of the first or second material layer to the other long side.

[0011] According to some preferred embodiments of the present invention, the stretching method is to stretch the composite material roll at a temperature of 100-120°C, wherein the fineness of the functional yarn is 30-50D.

[0012] According to some preferred embodiments of the present invention, in the step of preparing the composite material layer, the first material layer is located above the second material layer, the bottom surface of the first material layer is attached to the top surface of the second material layer, one end of the first material layer is flush with one end of the second material layer, the orthographic projection of the first material layer onto the second material layer is within the range of the second material layer, and the area where the bottom surface of the first material layer is attached to the top surface of the second material layer accounts for 70% to 90% of the area of ​​the top surface of the second material layer. This arrangement results in a composite material roll with the structure of alternating first and second material layers along the radial direction of the composite material roll.

[0013] According to some preferred embodiments of the present invention, in the step of preparing the composite material layer, the first material layer is located above the second material layer, one side of the bottom surface of the first material layer is attached to one side of the top surface of the second material layer, and the area of ​​the bottom surface of the first material layer attached to the top surface of the second material layer accounts for 1% to 2% of the bottom area of ​​the first material layer. This arrangement results in a composite material roll with the following structure after winding: along the radial direction of the composite material roll, the outermost ring of the composite material roll is the second material layer.

[0014] According to some preferred embodiments of the present invention, the composite material layer is prepared by means of: stacking a first material layer and a second material layer along the thickness direction, and then hot rolling the first material layer and the second material layer together to obtain the composite material layer. Hot rolling can eliminate air between the first material layer and the second material layer, avoiding the difficulties that air bubbles between the first material layer and the second material layer could cause in winding, thus preventing them from affecting the performance of subsequent functional yarns and fabrics.

[0015] According to some preferred embodiments of the present invention, the components of the first material layer and the second material layer include polyamide and functional additives, wherein the functional additives include one or more of an anti-ultraviolet additive, a cooling additive, or an antibacterial additive, and the mass ratio of the polyamide to the functional additive is 20-30:1. Specifically, the anti-ultraviolet additive is one of titanium dioxide, zinc oxide, salicylate, acrylonitrile polymer, or benzotriazole; the cooling additive is one of jade particles, pearl powder particles, or mica powder particles; and the antibacterial additive is one of nano-zinc oxide, nano-alumina, nano-zirconia, or nano-bamboo quinone powder.

[0016] According to some preferred embodiments of the present invention, the first material layer comprises one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer, and the second material layer comprises one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer; when the first material layer and the second material layer are the same, the mass proportion of the functional additives in the first material layer is different from the mass proportion of the functional additives in the second material layer; the polyamide layer is prepared from polyamide; the anti-ultraviolet layer, the cooling layer, or the antibacterial layer are formed by adding an anti-ultraviolet additive, a cooling additive, or an antibacterial additive to polyamide, respectively. In some embodiments of the present invention, the first material layer is one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer, and the second material layer is one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer.

[0017] According to some preferred embodiments of the present invention, the method for preparing the UV-resistant layer includes the following steps: adding a UV-resistant additive to a solvent and dispersing it to obtain a UV-resistant additive dispersion; mixing the UV-resistant additive dispersion with polyamide and heating it to 260–270°C; reacting for 1–1.5 h until the relative viscosity reaches 2.5–2.7; then removing the mixture and feeding it into an extruder to prepare a UV-resistant film; cooling the UV-resistant film to room temperature and allowing it to stand at room temperature for 6–8 h to obtain the UV-resistant layer. Cooling the UV-resistant film to room temperature and allowing it to stand at room temperature for 6–8 h allows it to undergo natural expansion and contraction, facilitating further processing of the prepared UV-resistant layer.

[0018] According to some preferred embodiments of the present invention, the method for preparing the cooling layer includes the following steps: adding a cooling agent to a solvent and ultrasonically dispersing it to obtain a cooling agent dispersion; mixing the cooling agent dispersion with polyamide and heating it to 260-270°C, reacting for 1-1.5 hours until the relative viscosity reaches 2.5-2.7, then removing it and adding it to an extruder to prepare a cooling film; cooling the cooling film to room temperature and then allowing it to stand at room temperature for 6-8 hours to obtain the cooling layer. Cooling the cooling film to room temperature and then allowing it to stand at room temperature for 6-8 hours allows it to undergo natural expansion and contraction, facilitating further processing of the prepared cooling layer.

[0019] According to some preferred embodiments of the present invention, the method for preparing the antibacterial layer includes the following steps: adding an antibacterial adjuvant to a solvent and ultrasonically dispersing it to obtain an antibacterial adjuvant dispersion; mixing the antibacterial adjuvant dispersion with polyamide and heating it to 260–270°C, reacting for 1–1.5 h until the relative viscosity reaches 2.5–2.7, then removing it and adding it to an extruder to prepare an antibacterial film; cooling the antibacterial film to room temperature and allowing it to stand at room temperature for 6–8 h to obtain the antibacterial layer. Cooling the antibacterial film to room temperature and allowing it to stand at room temperature for 6–8 h allows it to undergo natural expansion and contraction, facilitating further processing of the prepared antibacterial layer.

[0020] According to some preferred embodiments of the present invention, the method for preparing the polyamide layer includes the following steps: melting and extruding polyamide chips to obtain a polyamide film with a thickness of 0.3–0.5 mm; cooling the polyamide film to room temperature and then allowing it to stand at room temperature for 6–8 hours to obtain the polyamide layer. Cooling the polyamide film to room temperature and then allowing it to stand at room temperature for 6–8 hours allows it to undergo natural expansion and contraction, facilitating further processing of the prepared polyamide layer.

[0021] According to some preferred embodiments of the present invention, in the method for preparing the UV-resistant layer, the mass ratio of the polyamide to the UV-resistant additive is 20-30:1; in the method for preparing the cooling layer, the mass ratio of the polyamide to the cooling additive is 20-30:1; and in the method for preparing the antibacterial layer, the mass ratio of the polyamide to the antibacterial additive is 20-30:1.

[0022] According to some preferred embodiments of the present invention, the thickness of the UV-resistant film is 0.3 to 0.5 mm, the thickness of the cooling film is 0.3 to 0.5 mm, and the thickness of the antibacterial film is 0.3 to 0.5 mm.

[0023] According to some preferred embodiments of the present invention, the first material layer is an anti-ultraviolet layer, and the second material layer is a cooling layer. For a structure where the first material layer is an anti-ultraviolet layer and the second material layer is a cooling layer, ensuring that the outermost layer of the composite material roll is the second material layer after winding is beneficial for improving the cooling coefficient of the finally woven fabric.

[0024] According to some preferred embodiments of the invention, the size of the first material layer is smaller than the size of the second material layer. The composite layer has a structure where the first material layer is an anti-UV layer and the second material layer is a cooling layer. In the step of preparing such a composite layer, the first material layer is positioned above the second material layer, with the bottom surface of the first material layer adhered to the top surface of the second material layer, one end of the first material layer flush with one end of the second material layer, the orthographic projection of the first material layer onto the second material layer falling within the area of ​​the second material layer, and the area where the bottom surface of the first material layer adheres to the top surface of the second material layer accounting for 70% to 90% of the area of ​​the top surface of the second material layer. The size difference between the first and second material layers is designed to prevent the second material layer from failing to fully cover the first material layer after winding, thereby reducing the cooling effect of the woven fabric.

[0025] Another object of the present invention is to provide a functional yarn prepared by the above-described preparation method.

[0026] Another object of the present invention is to provide a fabric prepared by interlacing the aforementioned functional yarns, wherein the fabric has a density greater than or equal to 70%. Such density can ensure the fabric's excellent UV resistance.

[0027] Due to the adoption of the above technical solutions, the advantages of the present invention compared with the prior art are as follows: The fabric and its preparation method of the present invention obtain a composite material layer by preparing a first material layer and a second material layer respectively, and then obtain a functional yarn by winding and stretching the composite material layer. The fabric woven using the functional yarn has good cooling and UV protection effects. In the preparation process, it does not need to be compounded with other functional fibers, and no post-treatment or coating is required, so that the woven fabric has good cooling and UV protection functions at the same time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the main structure of the composite material layer obtained in step 3 of Embodiment 1 of the present invention;

[0030] Figure 2 This is a side view of the composite material roll in step 3 of Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the main structure of the composite material layer obtained in step 3 of Embodiment 2 of the present invention;

[0032] Figure 4 This is a side view of the composite material roll in step 3 of embodiment 2 of the present invention;

[0033] The attached figures are labeled as: First material layer-1, Second material layer-2. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] The yarn preparation method of the present invention includes the following steps:

[0036] Step 1: Prepare the first material layer 1.

[0037] Step 2: Prepare the second material layer 2.

[0038] In this design, the first material layer 1 is one or more of a polyamide layer, an anti-UV layer, a cooling layer, or an antibacterial layer, and the second material layer 2 is one or more of the same. The first material layer 1 can be a single layer or multiple layers, and the second material layer 2 can be a single layer or multiple layers. When the first material layer 1 and the second material layer 2 are the same, the mass percentage of functional additives in the first material layer 1 differs from the mass percentage of functional additives in the second material layer 2.

[0039] Alternatively, in some other embodiments of the present invention, the first material layer 1 and / or the second material layer 2 are single layers, and the components of the single-layer first material layer 1 and / or the second material layer 2 include polyamide and functional additives. The functional additives are one or more of anti-ultraviolet additives, cooling additives, or antibacterial additives, and the mass ratio of polyamide to functional additives is 20 to 30:1.

[0040] Specifically, the preparation method of the polyamide layer includes the following steps: polyamide chips are melt-extruded and cast to obtain a polyamide film with a thickness of 0.3 to 0.5 mm, and the polyamide film is cooled to room temperature and left to stand at room temperature for 6 to 8 hours to obtain the polyamide layer.

[0041] The method for preparing the UV-resistant layer includes the following steps: adding a UV-resistant additive to a solvent and dispersing it to obtain a UV-resistant additive dispersion; mixing the UV-resistant additive dispersion with polyamide and heating it to 260–270°C; reacting for 1–1.5 h until the relative viscosity reaches 2.5–2.7; then removing it and feeding it into an extruder to prepare a UV-resistant film with a thickness of 0.3–0.5 mm; cooling the UV-resistant film to room temperature and allowing it to stand at room temperature for 6–8 h to obtain the UV-resistant layer. The mass ratio of polyamide to UV-resistant additive is 20–30:1; the UV-resistant additive is one of titanium dioxide, zinc oxide, salicylate, acrylonitrile polymer, or benzotriazole.

[0042] The preparation method of the cooling layer includes the following steps: adding a cooling agent to a solvent and ultrasonically dispersing it to obtain a cooling agent dispersion; mixing the cooling agent dispersion with polyamide and heating it to 260-270℃, reacting for 1-1.5 hours until the relative viscosity reaches 2.5-2.7; then removing it and feeding it into an extruder to prepare a cooling film with a thickness of 0.3-0.5 mm; cooling the cooling film to room temperature and allowing it to stand at room temperature for 6-8 hours to obtain the cooling layer. The mass ratio of polyamide to cooling agent is 20-30:1. The cooling agent is one of jade particles, pearl powder particles, or mica powder particles.

[0043] The method for preparing the antibacterial layer includes the following steps: adding an antibacterial adjuvant to a solvent and ultrasonically dispersing it to obtain an antibacterial adjuvant dispersion; mixing the antibacterial adjuvant dispersion with polyamide and heating it to 260–270°C, reacting for 1–1.5 h until the relative viscosity reaches 2.5–2.7; then removing it and feeding it into an extruder to prepare an antibacterial film with a thickness of 0.3–0.5 mm; cooling the antibacterial film to room temperature and allowing it to stand at room temperature for 6–8 h to obtain the antibacterial layer. The mass ratio of polyamide to antibacterial adjuvant is 20–30:1. The antibacterial adjuvant is one of nano-zinc oxide, nano-alumina, nano-zirconia, or nano-bamboo quinone powder.

[0044] Step 3: Stack the first material layer 1 and the second material layer 2 along their thickness directions and hot-roll them together to obtain a composite material layer. Then, roll the composite material layer along the width direction of the first material layer 1 or the second material layer 2 from one side to the other, i.e., roll it from one long side of the first material layer 1 or the second material layer 2 to the other long side to obtain a cylindrical composite material roll with a diameter of 1.68–2 cm. If the first material layer 1 or the second material layer 2 is a multi-layer structure, the layers in the first material layer 1 or the second material layer 2 must be stacked sequentially along their thickness direction and hot-rolled together to bond the multiple layers together.

[0045] The composite material roll is filled with composite material layers from the inside to the outside along its radial direction, meaning that the central part of the composite material roll is not hollow.

[0046] Specifically, the winding of the composite material layer is carried out using a film winding machine in the existing technology. First, the composite material layer is rolled into a large roll on the roller of the film winding machine, and then the large roll on the roller is cut and wound using a rewinding and slitting machine to obtain multiple composite material rolls.

[0047] Step 4: The composite material roll is stretched using a uniform stretching device at a temperature of 100-120℃ to obtain a functional yarn with a fineness of 30-50D.

[0048] Example 1

[0049] The preparation method of the UV-resistant cooling fabric in this embodiment specifically includes the following steps:

[0050] Step 1: Add 20 parts of titanium dioxide to the polyethanol solvent and ultrasonically disperse to obtain a titanium dioxide dispersion. Add the titanium dioxide dispersion and 500 parts of polyamide to the reaction vessel, mix, and heat to 260°C. React for 1 hour until the relative viscosity reaches 2.5. Then take it out and add it to the extruder to prepare a 0.3 mm thick UV-resistant film. Cool the UV-resistant film to room temperature and let it stand at room temperature for 6 hours to obtain the UV-resistant layer. In this embodiment, the UV-resistant layer is the first material layer 1.

[0051] Step 2: Add 20 parts of pearl powder to the polyethylene glycol solvent and ultrasonically disperse to obtain a pearl powder dispersion. Add the pearl powder dispersion and 500 parts of polyamide to the reaction vessel, mix, and heat to 260°C. React for 1 hour until the relative viscosity reaches 2.5. Take it out and add it to the extruder to prepare a 0.3 mm thick cooling film. Cool the cooling film to room temperature and let it stand at room temperature for 6 hours to obtain a cooling layer. In this embodiment, the cooling layer is the second material layer 2. The width of the second material layer 2 is greater than the width of the first material layer 1.

[0052] Step 3: As Figure 1 As shown, a composite material layer is obtained by stacking the first material layer 1 on top of the second material layer 2 along the thickness direction of the first material layer 1 and the second material layer 2, and then hot-rolling it. This ensures that the area of ​​the bottom surface of the first material layer 1 in contact with the top surface of the second material layer 2 accounts for 80% of the top surface area of ​​the second material layer 2, one end of the first material layer 1 is flush with one end of the second material layer 2, and the orthographic projection of the first material layer 1 onto the second material layer 2 is within the range of the second material layer 2. Figure 2 As shown, the composite material layer is wound upwards and outwards from one long side of the first material layer 1, and from the end where the first material layer 1 and the second material layer 2 are flush, towards the other long side to obtain a cylindrical composite material roll with a diameter of 2 cm. That is, the roll is wound with the second material layer 2 on the outside and the first material layer 1 on the inside, ensuring that the outermost layer of the rolled composite material roll is the second material layer 2. The composite material roll is arranged radially with the first material layer 1 and the second material layer 2 alternating.

[0053] Step 4: Stretch the composite material roll at a temperature of 110℃ to obtain a functional yarn with a fineness of 30D.

[0054] This embodiment also provides a functional yarn prepared by the above-described method. The functional yarn is further interwoven as warp and weft to obtain a UV-resistant cooling fabric with a density of 75%. This fabric has a UV transmittance of 2.8%, a UPF value of 135, and an instantaneous cooling coefficient of 0.25 J / (cm²). 2 ·s), with a surface density of 46.5 g / m³. 2 .

[0055] Example 2

[0056] The preparation method of the UV-resistant cooling fabric in this embodiment specifically includes the following steps:

[0057] Step 1: Add 20 parts of titanium dioxide to polyvinyl alcohol solvent and ultrasonically disperse to obtain titanium dioxide dispersion. Add the titanium dioxide dispersion and 500 parts of polyamide to a reaction vessel and mix. Heat to 270°C and react for 1 hour until the relative viscosity reaches 2.7. Take it out and add it to an extruder to prepare a 0.5 mm thick UV-resistant film. Cool the UV-resistant film to room temperature and let it stand at room temperature for 8 hours to obtain the UV-resistant layer. In this embodiment, the UV-resistant layer is the first material layer 1.

[0058] Step 2: Add 20 parts of pearl powder to polyvinyl alcohol solvent and ultrasonically disperse to obtain pearl powder dispersion. Add the pearl powder dispersion and 500 parts of polyamide to the reaction vessel and mix. Heat to 270°C and react for 1 hour until the relative viscosity reaches 2.7. Take it out and add it to the extruder to prepare a 0.5 mm thick cooling film. Cool the cooling film to room temperature and let it stand at room temperature for 8 hours to obtain the cooling layer. The cooling layer in this embodiment is the second material layer 2.

[0059] Step 3: As Figure 3 As shown, a composite material layer is obtained by bonding one side of the bottom surface of the first material layer 1 to one side of the top surface of the second material layer 2 and hot rolling them together, ensuring that the area of ​​the bottom surface of the first material layer 1 bonded to the top surface of the second material layer 2 accounts for 2% of the bottom area of ​​the first material layer 1. Then, the composite material layer is wound upwards from the long side of the first material layer 1 away from the second material layer 2 and upwards towards the long side of the second material layer 2 away from the first material layer 1, resulting in a cylindrical composite material roll with a diameter of 2 cm. Figure 4 As shown, the outermost layer of the composite material roll is the second material layer 2, and the rest is the first material layer 1.

[0060] Step 4: Stretch the composite material layer at a temperature of 120℃ to obtain a functional yarn with a fineness of 50D.

[0061] This embodiment also provides a functional yarn prepared by the above-described method. The functional yarn is further interwoven as warp and weft to obtain an anti-UV cooling fabric with a density of 81%. This fabric has an UV transmittance of 3.2%, a UPF value of 80, and an instantaneous contact cooling coefficient of 0.22 J / (cm²). 2 ·s), with a surface density of 69 g / m³ 2 .

[0062] Example 3

[0063] The preparation method of the UV-resistant, antibacterial, and cooling fabric in this embodiment specifically includes the following steps:

[0064] Step 1: Add 20 parts of titanium dioxide to polyvinyl alcohol solvent and ultrasonically disperse to obtain titanium dioxide dispersion. Add the titanium dioxide dispersion and 500 parts of polyamide to a reaction vessel, mix, and heat to 270°C. React for 1 hour until the relative viscosity reaches 2.7. Take it out and add it to an extruder to prepare a 0.5 mm thick UV-resistant film. Cool the UV-resistant film to room temperature and let it stand at room temperature for 8 hours to obtain the UV-resistant layer. In this embodiment, the UV-resistant layer is the first material layer 1.

[0065] Step 2: Add 15 parts of nano-zirconia and 10 parts of pearl powder to polyvinyl alcohol solvent and ultrasonically disperse to obtain a mixed dispersion of nano-zirconia and pearl powder. Add the mixed dispersion and 500 parts of polyamide to the reaction vessel and mix. Heat to 270°C and react for 1 hour until the relative viscosity reaches 2.7. Take it out and add it to the extruder to prepare a 0.5 mm thick antibacterial cooling film. Cool the antibacterial cooling film to room temperature and let it stand at room temperature for 8 hours to obtain the antibacterial cooling layer, which is the second material layer 2.

[0066] Step 3: Attach one side of the bottom surface of the first material layer 1 to one side of the top surface of the second material layer 2 and hot roll to obtain a composite material layer. Ensure that the area where the bottom surface of the first material layer 1 is attached to the top surface of the second material layer 2 accounts for 2% of the bottom area of ​​the first material layer 1. Then, roll the composite material layer upward from the long side of the first material layer 1 away from the second material layer 2 and upward towards the long side of the second material layer 2 away from the first material layer 1 to obtain a cylindrical composite material roll with a diameter of 2cm. The outermost layer of the composite material roll is the second material layer 2, and the rest is the first material layer 1.

[0067] Step 4: Stretch the composite material layer at a temperature of 120℃ to obtain a functional yarn with a fineness of 50D.

[0068] This embodiment also provides a functional yarn prepared by the above-described method. The functional yarn is further interwoven as warp and weft to obtain an anti-UV cooling fabric with a density of 88%. This fabric has an UV transmittance of 3.0%, a UPF value of 92, and an instantaneous contact cooling coefficient of 0.20 J / (cm²). 2 ·s), with an inhibition rate of greater than 85% against Staphylococcus aureus, greater than 75% against Escherichia coli, and greater than 70% against Candida albicans, and an areal density of 68 g / m³. 2 .

[0069] Example 4

[0070] The preparation method of the UV-resistant fabric in this embodiment specifically includes the following steps:

[0071] Step 1: Add 20 parts of titanium dioxide to the polyethanol solvent and ultrasonically disperse to obtain a titanium dioxide dispersion. Add the titanium dioxide dispersion and 500 parts of polyamide to the reaction vessel, mix, and heat to 260°C. React for 1 hour until the relative viscosity reaches 2.5. Then take it out and add it to the extruder to prepare a 0.3 mm thick UV-resistant film. Cool the UV-resistant film to room temperature and let it stand at room temperature for 6 hours to obtain the UV-resistant layer. In this embodiment, the UV-resistant layer is the first material layer 1.

[0072] Step 2: The polyamide slices are melt-extruded and cast to obtain a polyamide film with a thickness of 0.3 mm. After the polyamide film is cooled to room temperature, it is left to stand at room temperature for 6 hours to obtain a polyamide layer. In this embodiment, the polyamide layer is the second material layer 2.

[0073] Step 3: Attach one side of the bottom surface of the first material layer 1 to one side of the top surface of the second material layer 2 and hot roll to obtain a composite material layer. Ensure that the area where the bottom surface of the first material layer 1 is attached to the top surface of the second material layer 2 accounts for 1.5% of the bottom area of ​​the first material layer 1. Then, roll the composite material layer upward from the long side of the first material layer 1 away from the second material layer 2 and upward towards the long side of the second material layer 2 away from the first material layer 1 to obtain a cylindrical composite material roll with a diameter of 2cm. The outermost layer of the composite material roll is the second material layer 2, and the rest is the first material layer 1.

[0074] Step 4: Stretch the composite material roll at a temperature of 110℃ to obtain a functional yarn with a fineness of 30D.

[0075] This embodiment also provides a functional yarn prepared by the above-described method. The functional yarn is further interwoven as warp and weft to obtain an UV-resistant fabric with a density of 77%. This fabric has a UV transmittance of 2.9%, a UPF value of 115, and a surface density of 49.5 g / m². 2 .

[0076] As can be seen from Examples 1 to 4 above, the functional yarn prepared by the method of the present invention can be used to weave fabrics with corresponding functions without the need for finishing or coating operations. It can also make the fabric have good UV resistance, cooling or antibacterial properties, and these corresponding properties will not be affected. The preparation process is simplified while obtaining fabrics with good performance and corresponding functions.

[0077] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a fabric, characterized in that, Includes the following steps: The fabric with a density greater than or equal to 70% is prepared by interlacing functional yarns as warp and weft yarns respectively. The functional yarn is obtained by winding the composite material layer into a cylindrical composite material roll, and then stretching the composite material roll along its axial direction; the composite material roll is alternately arranged with a first material layer and a second material layer along its radial direction, the composite material layer includes a first material layer and a second material layer, and the winding is performed by curling along one long side of the first material layer or the second material layer towards the other long side. The bottom surface of the first material layer in the composite material layer is attached to the top surface of the second material layer, one end of the first material layer is flush with one end of the second material layer, and the orthographic projection of the first material layer on the second material layer is within the range of the second material layer; the size of the first material layer is smaller than the size of the second material layer. The area where the bottom surface of the first material layer and the top surface of the second material layer are in contact accounts for 70% to 90% of the area of ​​the top surface of the second material layer.

2. The preparation method according to claim 1, characterized in that, The diameter of the tubular composite material roll is 1.68–2 cm; the fineness of the functional yarn is 30–50 D.

3. The preparation method according to claim 1, characterized in that, The stretching is carried out at a temperature of 100–120°C.

4. The preparation method according to claim 1, characterized in that, Both the first and second material layers comprise polyamide, and at least one of the first and second material layers comprises a functional additive; the functional additive comprises one or more of an anti-ultraviolet additive, a cooling additive, or an antibacterial additive.

5. The preparation method according to claim 4, characterized in that, The first material layer includes one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer; the second material layer includes one or more of a polyamide layer, an anti-ultraviolet layer, a cooling layer, or an antibacterial layer; the polyamide layer is prepared from polyamide; the anti-ultraviolet layer, the cooling layer, or the antibacterial layer are formed by adding an anti-ultraviolet additive, a cooling additive, or an antibacterial additive to polyamide, respectively.

6. The preparation method according to claim 5, characterized in that, The fabric is an anti-ultraviolet and cooling fabric, the first material layer is the anti-ultraviolet layer, and the second material layer is the cooling layer.

7. The preparation method according to claim 5, characterized in that, The fabric is an anti-ultraviolet, antibacterial, and cooling fabric, with the first material layer being the anti-ultraviolet layer and the second material layer being the antibacterial and cooling layer.

8. The preparation method according to claim 5, characterized in that, The fabric is an anti-ultraviolet fabric, the first material layer is the anti-ultraviolet layer, and the second material layer is the polyamide layer.

9. A fabric, characterized in that, The fabric is prepared by the preparation method according to any one of claims 1 to 8.

Images