Multifunctional cool fiber, preparation method thereof and fabric

Abstract

The invention provides a multifunctional cool fiber, a preparation method thereof and a fabric, and the method comprises the following steps: nylon slices are melted and extruded into a fiber core layer melt in a high-temperature melting and low-temperature extrusion mode; a functional skin layer material is melted and extruded into a fiber skin layer melt in a high-temperature melting and low-temperature extrusion mode, and the functional skin layer material comprises alkali-soluble polyester, nano titanium dioxide and nylon components; the fiber core layer melt and the fiber skin layer melt are subjected to composite forming through a skin-core structure composite spinning assembly and are subjected to alkali washing, and the multifunctional cool fiber is obtained. The cool feeling performance of nylon is utilized, certain functional components such as sunscreen components and quick-drying components are compounded on the surface of the nylon core layer, and the texture morphology of the fiber surface is highlighted, so that the formed fabric has excellent multiple wearability of moisture absorption, quick drying, UV resistance and cool feeling.

Description

Technical Field

[0001] The invention belongs to the field of textile material preparation, and relates to a multifunctional cooling fiber, a preparation method thereof and a fabric. Background Art

[0002] Nylon fiber (commonly known as nylon) can quickly conduct heat, making nylon fabrics feel cool to the touch. They are often used as fabrics for summer short-sleeved shirts and sun-protective clothing, and are deeply loved by consumers in the market. However, when worn in summer, the wearing experience of nylon fabrics has the following problems: in the case of long-term outdoor exercise and heavy sweating, due to the high moisture regain of nylon fiber, about 4.5%, it is relatively hydrophilic, and its fabric easily absorbs and locks sweat, causing sweat to dry slowly, resulting in clothing sticking to the body, creating a stuffy feeling, uncomfortable to wear, and easy to cause people to catch a cold when the temperature changes; and the sun-protective clothing category needs to be light, comfortable, and cool to the touch, and have good sun protection and ultraviolet (UV) resistance. Therefore, the industry needs to research and develop how to give nylon fabrics good moisture absorption, quick drying, and sun protection functions according to scene requirements.

[0003] For the problems of poor moisture absorption and quick-drying performance of nylon fabrics, stickiness and stuffiness, the main solution for a long time has been to add moisture absorption and perspiration additives during the fabric finishing stage; and for the functional requirements of UV resistance, it is often achieved by adding ultraviolet absorption additives for finishing. However, this solution of adding additives has limited improvement in the quick-drying and UV resistance of nylon fabrics, and the finishing additives will be separated from the fabric after several washes, resulting in a significant decrease in performance. In recent years, with the development of technologies such as core-skin composite fibers, core-layer nylon, skin-layer polyester, or core-layer polyester, skin-layer nylon composite fibers have emerged, which combine certain functions of the skin and core layers. However, the surface layer of these fibers is usually only conventional nylon or polyester, and the performance is relatively simple, making it difficult to meet multiple functional requirements such as good moisture absorption and perspiration resistance and UV resistance. Summary of the invention

[0004] In view of this, the present invention provides a multifunctional cooling fiber, a preparation method thereof and a fabric. The cooling fiber prepared by the present invention is used for weaving fabrics. While taking into account the cooling feeling, it has good moisture absorption, quick drying and sun protection properties, and can effectively solve the problems of sweat-inducing fabrics and single function.

[0005] The present invention provides a method for preparing a multifunctional cooling fiber, comprising the following steps:

[0006] The nylon slices are melted and extruded at a high temperature to form a fiber core layer melt; the functional skin layer material is melted and extruded at a low temperature to form a fiber skin layer melt, wherein the functional skin layer material comprises an alkali-soluble polyester, nano titanium dioxide and a nylon component;

[0007] The fiber core layer melt and the fiber skin layer melt are compositely formed through a core-skin structure composite spinning assembly, and then washed with alkaline water to obtain a multifunctional cool fiber.

[0008] In a specific embodiment of the present invention, the functional skin material includes 2-20wt% alkali-soluble polyester, 1-20wt% nano titanium dioxide and 60-95% nylon component; the nylon component and nylon slices are at least one of PA6, PA66, PA56 and PA510 respectively.

[0009] In a specific embodiment of the present invention, the functional skin layer material further comprises 0.1-2% of a coupling agent; the coupling agent is a silane coupling agent and / or an ester coupling agent.

[0010] In a specific embodiment of the present invention, the preparation of the functional skin material includes: drying and mixing nylon chips, alkali-soluble polyester and nano-titanium dioxide, extruding them by screw at a screw extrusion temperature of 270-330°C, and pelletizing to obtain the functional skin material.

[0011] In a specific embodiment of the present invention, the temperature of melt extrusion of the nylon slice is 220-250°C; the temperature of melt extrusion of the functional skin layer material is 250-280°C.

[0012] In a specific embodiment of the present invention, the mass ratio of the fiber skin layer melt to the fiber core layer melt is 4:1 to 1:4.

[0013] In a specific embodiment of the present invention, the composite forming includes stretching and / or deformation processing.

[0014] In a specific embodiment of the present invention, before the water washing, the process also includes: weaving the composite formed fibers; and washing the woven grey cloth with alkaline to form a multifunctional cool fiber fabric.

[0015] The invention provides a fabric, which is made by weaving the cool fiber obtained by the preparation method described above and then washing with alkaline.

[0016] In a specific embodiment of the present invention, the fabric is a colored knitted fabric with a gram weight of 150-190 g / m 2 .

[0017] Compared with the prior art, the present invention provides a preparation process and fabric of a cool feeling fiber with functional components such as anti-UV on the surface. The process method comprises: using a material containing components such as alkali-soluble polyester and nano titanium dioxide as a functional skin layer material, and nylon core layer material through melt composite spinning, and then washing with alkaline water (referred to as alkaline washing) to obtain a cool feeling nylon skin core fiber with multifunctional functions such as anti-UV, moisture absorption and quick drying. The present application utilizes the cool feeling property of nylon, composites certain functional components such as sunscreen, moisture absorption and quick drying on the surface of the nylon core layer, and highlights the texture morphology of the fiber surface, so that the formed fabric has excellent moisture absorption and quick drying, UV resistance, and cool feeling multiple wearing properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Schematic diagram of the cross section of the cooling fiber prepared in the embodiment of the present application;

[0020] Figure 2 This is a morphology diagram of the cooling fiber prepared in Example 1 of the present application;

[0021] Figure 3 This is a 10 micron scale morphology image of the cooling fiber prepared in Example 1 of the present application;

[0022] Figure 4 This is a morphology diagram of the cool fiber prepared in Example 2 of the present application. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the technical scheme of the present invention is now described in detail below in conjunction with specific embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0024] The present invention provides a method for preparing a multifunctional cooling fiber, comprising the following steps:

[0025] The nylon slices are melted and extruded at a high temperature to form a fiber core layer melt; the functional skin layer material is melted and extruded at a low temperature to form a fiber skin layer melt, wherein the functional skin layer material comprises an alkali-soluble polyester, nano titanium dioxide and a nylon component;

[0026] The fiber core layer melt and the fiber skin layer melt are compositely formed through a core-skin structure composite spinning assembly, and then washed with alkaline water to obtain a multifunctional cool fiber.

[0027] The invention provides a multifunctional cooling fiber for weaving fabrics, which has good moisture absorption, quick drying and sun protection performances while taking into account the cooling feeling, and is conducive to application in clothing fabrics.

[0028] Some embodiments of the present invention first prepare functional skin materials, including: drying nylon chips, alkali-soluble polyester and nano-titanium dioxide, and then adding them together with a coupling agent to a high-speed mixer for mixing; extruding the mixed skin raw materials using a screw, the screw extrusion temperature is 270-330°C, and the melt is stretched, cooled, blown and cut into particles to obtain a functional skin material.

[0029] Wherein, alkali-soluble polyester (CO-PET) is selected as a quick-drying functional component, TiO2 nanoparticles are selected as an anti-UV functional component, nylon slices, CO-PET masterbatch, and TiO2 nanoparticles are vacuum dried for 12 hours, and after being dried as raw materials (dried to a moisture content of less than 50ppm), they are mixed with a coupling agent according to a formula. The alkali-soluble polyester is a thermoplastic polyester made by polycondensation reaction of dimethyl terephthalate (DMT) and a low-boiling point straight-chain diol, with a viscosity in the range of 0.5 to 0.8dl / g and a melting point between 180°C and 220°C. Commercially available products can be used (Toray, Mitsubishi Chemical, Teijin, SK Chemicals and other companies produce and sell such special polyester materials); nylon slices are commercially available common fiber-grade nylon slices (Jinjiang Technology Co., Ltd., Hengshen Group, etc. have such fiber-grade nylon slices), such as polyamide 6 (PA6), polyamide 66 (PA66), etc. The coupling agent includes one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent and zirconate coupling agent, and further includes vinyl triethoxysilane coupling agent or bis(dioctyl phosphate) glycol titanate; the average particle size of nano titanium dioxide can be 500nm.

[0030] In some embodiments, the functional skin material comprises, by mass percentage, 2-20% CO-PET, 1-20% nano-TiO2, 0.1-2% coupling agent, and 60%-94% nylon (one of PA6, PA66, PA56, and PA510). Meanwhile, the core material of the embodiment of the present invention comprises 100% by mass of one of PA6, PA66, PA56, or PA510.

[0031] The embodiment of the present invention can use a twin-screw spinning device to melt-extrude the nylon slices in a high-temperature melting and low-temperature extrusion manner. The temperatures of the first to fifth sections of the spinning screw are preferably set to 250-240°C, 245-235°C, 240-230°C, 235-225°C, and 230-220°C, respectively, and the first melt is melt-extruded as the fiber core layer melt. The temperature of the above-mentioned spinning assembly screw is gradually reduced because the slices need to be melted into liquid at a higher temperature to improve fluidity, and then the temperature is slightly reduced before extrusion, the fluidity of the liquid is reduced, and the formability is improved. Finally, when the filaments are ejected, they can be instantly cooled and formed to obtain a tow.

[0032] Moreover, in the embodiment of the present invention, the functional skin material is melted at high temperature and extruded at low temperature, and the temperatures of the first to fifth sections of the spinning screw are preferably set to 280-270°C, 275-265°C, 270-260°C, 265-255°C, and 260-250°C respectively: the melt-extruded material is formed into a second melt as the fiber functional skin melt.

[0033] In the embodiment of the present invention, the functional sheath melt and the core layer melt of the fiber are passed through a conventional sheath-core structure composite spinning assembly, and are ejected from a spinneret to form, and then subjected to a drawing and / or deformation treatment, and then alkaline water washing, to obtain a multifunctional nylon cooling fiber with a sheath-core structure.

[0034] In single melt spinning, the spinning polymer is usually melted in a screw extruder, then fed into the spinning area, quantitatively fed into the spinning assembly by a spinning pump, filtered and extruded from the capillaries of the spinneret; the extruded liquid filaments gradually solidify when passing through the cooling medium, and then are stretched into filaments at high speed by the winding device below. The filaments are primary fibers, which are processed into textile fibers after stretching, deformation, etc., such as pre-oriented yarns (POY), fully drawn yarns (FDY), low elastic yarns (DTY), etc.

[0035] Among them, the mass ratio of the functional skin material and the nylon slice core material described in the embodiment of the present invention (referred to as the skin-core ratio, or the mass ratio of the corresponding skin melt and the core melt) can be any ratio between 4:1 and 1:4, for example, the skin-core ratio is 1:1, 2:1, 3:1, 4:1. The spinneret generally has circular spinneret holes, and the number of holes F is not particularly limited, such as 36 to 48F. In some embodiments, after stretching and deformation, the stretching ratio is 3 to 4, the spinning speed is 2200 to 2800 m / min, the stretching temperature is 160 to 180°C, and the cold air temperature of air cooling is generally 20°C.

[0036] The embodiment of the present invention can remove a small part of the CO-PET component on the fiber surface through an alkali washing process of the fiber or grey cloth, that is, an alkaline washing method, so that a certain concave-convex texture morphology appears on the fiber surface, combined with the titanium dioxide component on the fiber surface and the remaining CO-PET component, thereby giving the fiber fabric excellent moisture absorption, quick drying, cool feeling and UV resistance. Alkali washing can generally be performed in the dyeing vat. Before dyeing, an alkali washing is performed first, and then the dyeing vat is cleaned, and then the dyeing solution is added for dyeing and finishing. Specifically, the alkali washing process includes: using 10g / L sodium carbonate NaCO3 solution as the alkali washing working solution, the bath ratio can be 1:20, the temperature is 50-60°C, and the alkaline washing time is 3-5 minutes.

[0037] Some embodiments of the present invention provide multifunctional cooling fibers prepared by the above method, which are composite fibers with a core-skin structure; Figure 1 As shown, the composite fiber includes a cortex 1 and a core layer 2, and the cortex 1 is the functional layer on the surface, with some functional components evenly distributed. Specifically, the specification of the cool fiber can be 70D / 48F or 50D / 36F, specifically FDY or DTY. Denier (D) - also known as "denier" or (denier: denier), refers to the weight of 9000 meters of yarn or fiber at the official regain. It is a fixed-length unit. The larger the gram weight, the thicker the yarn or fiber. It is often used to represent chemical filaments, silk, etc. The embodiment of the present invention provides the functionally optimized core-skin structure nylon fiber, which has less change on the original properties of the nylon fiber, and its usage scenarios and product versatility are relatively high; and its preparation is simple, which is conducive to actual mass production.

[0038] In other embodiments, the fibers are first woven after forming, and then the woven grey cloth is subjected to alkaline washing to form a multifunctional cool fiber fabric. The embodiment of the present invention preferably performs alkali washing on the fabric grey cloth to facilitate processing, etc. Specifically, the obtained composite fiber can be woven by a circular knitting machine to obtain the knitted grey cloth, and then the fabric can be surface treated by an alkali washing process to activate the function of the fiber and form a certain concave-convex morphology on the fiber surface; the conventional dyeing and finishing process of nylon fabric can also be carried out to obtain a multifunctional nylon knitted fabric (stable dyeing performance), and its gram weight can be 150-190g / m 2 .

[0039] The embodiment of the present invention provides a fabric, which is woven by the cool fiber obtained by the preparation method described above and then washed with alkaline. In some embodiments, the fabric is a colored knitted fabric, which can be warp knitted or weft knitted, and there is no special restriction on its fabric structure. The weight is preferably 150-190 g / m 2In addition, it can also be a woven fabric. Based on the prepared multifunctional cool fiber, the fabric has good moisture absorption and quick drying, sun protection and cool feeling functions (the contact cool feeling coefficient Qmax value is above 0.25), and the wearing performance is excellent.

[0040] In order to better illustrate the present invention, the following examples are further illustrated. In the examples, all raw reagents and materials are commercially available, and the experimental methods without specific experimental conditions are conventional methods and conditions well known in the art.

[0041] Example 1

[0042] This embodiment discloses the preparation and fabric of a cool feeling fiber having moisture absorption, quick drying and UV resistance functional components on the surface, as follows:

[0043] Fiber-grade PA6 chips (Jinjiang Technology Co., Ltd.), alkali-soluble polyester (CO-PET, Toray) masterbatch and nano-TiO2 with an average particle size of 500 nm were vacuum drum dried at 95°C until the moisture content was less than 50 ppm.

[0044] The dried PA6 slices, alkali-soluble polyester (CO-PET) masterbatch and nano-TiO2 are added into a high-speed mixer for mixing according to the mass ratio of PA6 (78%), CO-PET (10%), nano-TiO2 (10%) and vinyl triethoxysilane coupling agent (2%). The mixed raw materials are extruded by a screw with a screw temperature of 300°C. After being drawn into strips, the melt is cooled and blown dry at 20 degrees and cut into particles to obtain a functional skin material.

[0045] A twin-screw spinning device is used to melt-extrude fiber-grade nylon slices in a high-temperature melting and low-temperature extrusion manner, and the temperatures of the first to fifth sections of the spinning screw are set to 250-240°C, 245-235°C, 240-230°C, 235-225°C, and 230-220°C, respectively, to form a first melt as the fiber core layer melt; the functional skin material is melted in a high-temperature melting and low-temperature extrusion manner, and the temperatures of the first to fifth sections of the spinning screw are set to 280-270°C, 2 75-265℃, 270-260℃, 265-255℃, 260-250℃: melt extrusion into a second melt, as the fiber functional skin melt; the fiber functional skin melt and the core melt are passed through a skin-core structure composite spinning assembly, extruded from a spinneret, the skin-core mass ratio is 1:1, and after drawing, the drawing ratio is 3.5, the spinning speed is 2500m / min, the stretching temperature is 160℃, and the cold air temperature is 20℃, to obtain a nylon cool fiber with a quick-drying sunscreen functional component in the skin. The obtained fiber specifications are 70D / 48F, FDY, and the morphology is shown in Figure 2 .

[0046] The obtained fiber was woven and pre-shaped by a knitting circular machine to obtain a grey cloth. Before the formal dyeing process, the grey cloth was alkali-washed in a dye vat with a 10g / L NaCO3 solution, a bath ratio of 1:20, a temperature of 60°C, and an alkaline washing time of 5 minutes. Subsequently, the conventional dyeing and finishing process of nylon fabrics was carried out to obtain a uniformly dyed and brightly colored nylon knitted fabric with a gram weight of 150g / m 2 .

[0047] The performance of the obtained fabric was compared with that of conventional nylon PA6 fabric of the same weight and nylon PA6 fabric treated with functional additives before washing and after 10 times of 4N standard washing. The performance was evaluated as follows: moisture absorption and quick-drying performance test was carried out in accordance with the national standard GB / T21566.1-2023, ultraviolet protection factor UPF value test was carried out in accordance with GB / T18830-2009, and contact coolness coefficient Qmax value test was carried out in accordance with GB / T 35263.

[0048] The results are as follows; it can be seen that the multifunctional fiber fabric of Example 1 has a higher drying rate, excellent sun protection, and good cooling properties.

[0049] Table 1 Performance indexes of the fabric obtained in Example 1

[0050]

[0051]

[0052] Example 2

[0053] This embodiment discloses the preparation and fabric of a cool feeling fiber having moisture absorption, quick drying and UV resistance functional components on the surface, as follows:

[0054] Fiber-grade PA66 chips (Hengshen Group), alkali-soluble polyester (CO-PET, Toray) masterbatch and nano-TiO2 with an average particle size of 500 nm were vacuum drum dried at 95°C until the moisture content was less than 50 ppm.

[0055] The dried PA66 slices, alkali-soluble polyester (CO-PET) masterbatch and nano-TiO2 are added into a high-speed mixer for mixing according to the mass ratio of PA66 (70%), CO-PET (18%), nano-TiO2 (10%) and bis(dioctyl phosphate) glycol titanate (2%). The mixed raw materials are extruded by a screw with a screw temperature of 300°C. After being drawn into strips, the melt is cooled and blown dry at 20 degrees and cut into particles to obtain a functional skin material.

[0056] A twin-screw spinning device is used to melt-extrude fiber-grade nylon slices in a high-temperature melting and low-temperature extrusion manner, and the temperatures of the first to fifth sections of the spinning screw are set to 260-250°C, 255-245°C, 250-240°C, 245-235°C, and 240-230°C, respectively, to form a first melt as the fiber core layer melt; the functional skin layer material is melted in a high-temperature melting and low-temperature extrusion manner, and the temperatures of the first to fifth sections of the spinning screw are set to 280-270°C, 270-280°C, 280-290°C, 29 ... 5-265℃, 270-260℃, 265-255℃, 260-250℃: melt extrusion into a second melt, as the fiber functional skin melt, through the fiber functional skin melt and the core melt through the skin-core structure composite spinning assembly, extrusion molding from the spinneret, the skin-core ratio is 2:1, after drawing deformation, drawing ratio 3.5, spinning speed 2500m / min, stretching temperature 180℃, cold air temperature 20℃, to obtain a nylon cool fiber with quick-drying sunscreen functional components in the skin. The obtained fiber specifications are 50D / 36F, DTY, morphology see Figure 4 .

[0057] The obtained fiber was woven by a warp knitting machine to obtain a grey cloth. Before the formal dyeing process, the grey cloth was alkali-washed in a dye vat with a 10g / L NaCO3 solution, a bath ratio of 1:20, a temperature of 60°C, and an alkaline washing time of 5 minutes. Subsequently, the conventional dyeing and finishing process of nylon fabrics was carried out to obtain a uniformly dyed and brightly colored nylon knitted fabric with a gram weight of 190g / m 2 .

[0058] The performance of the obtained fabric was compared with that of conventional nylon PA66 warp knitted fabric of the same weight and nylon PA66 warp knitted fabric treated with UV absorption and sunscreen functional additives before washing and after 10 times of 4N standard washing. The performance was evaluated as follows: moisture absorption and quick-drying performance test was carried out in accordance with the national standard GB / T 21566.1-2023, ultraviolet protection factor UPF value test was carried out in accordance with GB / T 18830-2009, and contact coolness coefficient Qmax value test was carried out in accordance with GB / T35263.

[0059] The results are as follows; it can be seen that the multifunctional fiber fabric of Example 2 has a higher drying rate, excellent sun protection, and good cooling properties.

[0060] Table 2 Performance indicators of the fabric obtained in Example 2

[0061]

[0062] Functional additives include sunscreen additives and moisture-absorbing and quick-drying additives. Sunscreen additives are mainly some UV absorbers, and moisture-absorbing and quick-drying additives are mainly some polyether compounds, which can enhance water absorption and diffusion and improve quick-drying performance.

[0063] As can be seen from the above embodiments, in the process method of the embodiment of the present invention, a material containing ingredients such as alkali-soluble polyester and nano-titanium dioxide is used as a functional skin layer material, and is melt-spun with a nylon core layer material, and then washed with alkali to obtain a multifunctional cool nylon skin-core fiber with anti-UV, moisture absorption and quick drying. This application utilizes the cool feeling of nylon, composites certain functional components such as sunscreen and moisture absorption on the surface of the nylon core layer, and highlights the texture morphology of the fiber surface, so that the formed fabric has excellent moisture absorption and quick drying, UV resistance, and cool feeling multiple wearing properties, which is conducive to application.

[0064] The above examples are only used to illustrate the technical features and implementation process of the present invention, rather than to limit the technical solution of the present invention. It should be pointed out that for ordinary technicians in this field, the present invention can still be modified or replaced by equivalents, and modifications or replacements that do not deviate from the principles of the present invention are all covered by the protection of the present invention.

Claims

1. A method for preparing a multifunctional cooling fiber, characterized in that: The following steps are involved: The nylon slices are melted and extruded at a high temperature to form a fiber core layer melt; the functional skin layer material is melted and extruded at a low temperature to form a fiber skin layer melt, wherein the functional skin layer material comprises an alkali-soluble polyester, nano titanium dioxide and a nylon component; The fiber core layer melt and the fiber skin layer melt are compositely formed through a core-skin structure composite spinning assembly, and then washed with alkaline water to obtain a multifunctional cool fiber.

2. The preparation method according to claim 1, characterized in that: The functional skin layer material comprises 2-20wt% of alkali-soluble polyester, 1-20wt% of nano titanium dioxide and 60-95% of nylon components; the nylon components and nylon slices are at least one of PA6, PA66, PA56 and PA510 respectively.

3. The preparation method according to claim 2, characterized in that: The functional skin layer material also includes 0.1-2% of a coupling agent; the coupling agent is a silane coupling agent and / or an ester coupling agent.

4. The preparation method according to any one of claims 1 to 3, characterized in that The preparation of the functional skin material comprises: drying and mixing nylon slices, alkali-soluble polyester and nano titanium dioxide, extruding by a screw at a screw extrusion temperature of 270-330° C., and pelletizing to obtain the functional skin material.

5. The preparation method according to any one of claims 1 to 3, characterized in that: The temperature of the melt extrusion of the nylon slice is 220-250°C; the temperature of the melt extrusion of the functional skin layer material is 250-280°C.

6. The preparation method according to any one of claims 1 to 3, characterized in that: The mass ratio of the fiber skin layer melt to the fiber core layer melt is 4:1 to 1:

4.

7. The preparation method according to any one of claims 1 to 3, characterized in that: The composite forming includes stretching and / or deformation processing.

8. The preparation method according to claim 7, characterized in that: Before the water washing, the method also includes: weaving the composite formed fibers; and washing the woven grey cloth with alkaline to form a multifunctional cool fiber fabric.

9. A fabric, characterized in that: The cool feeling fiber obtained by the preparation method according to any one of claims 1 to 6 is woven and then washed with alkaline to prepare the product.

10. The fabric according to claim 9, characterized in that: The fabric is a colored knitted fabric with a gram weight of 150-190 g / m 2 .

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