Moisture-absorbing, dry, breathable, sweat-conducting hollow fiber and preparation method thereof

Abstract

The present application discloses a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber and a preparation method thereof, wherein a high-viscosity polyester with an intrinsic viscosity of 0.76 to 0.86 is selected as a main melt, and 5% to 25% of a polymerization degree P is mixed into the polyester melt. n The alkali-soluble polyester with a viscosity of 138 to 150 is used to spin a moisture-absorbing, dry, breathable and sweat-conducting hollow fiber through a spinneret; wherein the spinneret is provided with one or more spinneret units; each spinneret unit includes a plurality of melt flow channels spaced apart along the circumference; the melt flow channel has at least one first bend and at least two second bends, and the first bend is closer to the center of the spinneret unit than the second bend; after the polyester melt passes through the melt flow channel of the spinneret unit, the fibers flowing out of adjacent melt flow channels are connected together. The moisture-absorbing, dry, breathable and sweat-conducting hollow fiber and its preparation method provided in this specification comprehensively utilize the groove capillary effect, hollowness, and micropores through the fiber wall, so that the fiber has the advantages of light weight, warmth retention, moisture absorption and moisture permeability, dryness, breathability, and softness.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester spinning, and in particular to a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber and a preparation method thereof. Background Art

[0002] The description in this section merely provides background information related to the disclosure of this specification and does not constitute prior art.

[0003] Compared with natural fibers and semi-synthetic fibers, polyester fibers have high strength, good elasticity, and are easy to wash, dry, stiff, and easy to care for. They are widely used in clothing, home textiles, and other fields. However, due to the hydrophobic macromolecular structure, polyester fibers have the disadvantages of poor hygroscopicity, airtightness, non-sweat absorption, and easy generation of static electricity. Therefore, improving the moisture absorption, air permeability, and sweat conductivity of polyester fiber fabrics through physical and chemical modification methods is an important direction for the differentiation of polyester fibers.

[0004] At present, there are many kinds of moisture-absorbing and sweat-releasing polyester fibers at home and abroad. Among them, grooves can be obtained by using special-shaped cross-sections such as Y-shaped, cross-shaped, and M-shaped, so that the fiber has a capillary effect and has the function of sweat-releasing liquid, but the fiber still does not have air permeability and sweat permeability. Although hollow fibers with a hollowness greater than 20% have certain air permeability and sweat permeability, due to the lack of capillary grooves, the moisture absorption and dryness are not ideal.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of this specification and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of this specification. Summary of the invention

[0006] In view of the deficiencies in the prior art, one purpose of this specification is to provide a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber and a preparation method thereof, which comprehensively utilizes the groove capillary effect, hollowness, and micropores through the fiber wall to make the fiber have the advantages of being lightweight, warm, moisture-absorbing and permeable, dry, breathable, and soft.

[0007] To achieve the above purpose, the present specification provides a method for preparing a moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber, comprising:

[0008] A high viscosity polyester with an intrinsic viscosity of 0.76 to 0.86 is selected as the main melt, and 5% to 25% of polymerization degree P is mixed into the polyester melt. nThe alkali-soluble polyester with a viscosity of 138 to 150 is used to spin moisture-absorbing, dry, breathable and sweat-conducting hollow fibers through a spinneret; wherein the spinneret is provided with one or more spinneret units; each of the spinneret units comprises a plurality of melt flow channels spaced apart along the circumferential direction; the melt flow channel has at least one first bend and at least two second bends, and the first bend is closer to the center of the spinneret unit than the second bend; after the polyester melt passes through the melt flow channel of the spinneret unit, the melts flowing out of adjacent melt flow channels are bonded together to form the moisture-absorbing, dry, breathable and sweat-conducting hollow fibers with a structure of multiple inner and outer grooves.

[0009] As a preferred embodiment, 0.1% to 1.0% of nanometer alkaline earth metal salt or its oxide and alkali-soluble amphoteric metal oxide are mixed into the polyester melt; wherein the nanometer alkaline earth metal salt is one of magnesium carbonate, calcium carbonate, strontium carbonate, barium carbonate and barium sulfate, and the nanometer alkaline earth metal salt oxide and alkali-soluble amphoteric metal oxide are one of calcium oxide, magnesium oxide, zinc oxide and aluminum oxide.

[0010] As a preferred embodiment, nano zinc oxide-doped titanium dioxide is mixed into the polyester melt, the addition amount of the nano zinc oxide-doped titanium dioxide is 0.25% to 0.5% of the polyester melt, and the content of the nano zinc oxide is 15% to 30% of the titanium dioxide content.

[0011] As a preferred embodiment, the polyester melt is a high-viscosity polyester with an intrinsic viscosity of 0.78 to 0.82; and 8% to 15% of the alkali-soluble polyester is mixed into the polyester melt.

[0012] As a preferred embodiment, the number of the melt flow channels is at least four, and the melt flow channels have a first bend and two second bends; the first bend forms an outer capillary, and the second bend forms an inner capillary, the number of the outer capillary grooves is greater than or equal to four, and the number of the inner capillary grooves is greater than or equal to eight.

[0013] As a preferred embodiment, the distance between two adjacent melt flow channels in the spinneret unit is 0.08-0.20 mm.

[0014] As a preferred embodiment, the equivalent diameter of the spinneret unit is 0.08 mm to 0.25 mm. Wherein, n is the number of the melt flow channels in the spinneret unit, S is the area of ​​a single melt flow channel in the spinneret unit, and L is the circumference of a single melt flow channel in the spinneret unit.

[0015] As a preferred embodiment, the theoretical hollowness of the spinneret unit is greater than or equal to 65%, and the theoretical hollowness = the area enclosed by the inner walls of the plurality of melt flow channels / the area enclosed by the outer walls of the plurality of melt flow channels × 100%.

[0016] The embodiments of the present specification also provide a moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber, which is made by the method for preparing the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber as described in any of the above embodiments.

[0017] As a preferred embodiment, the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber comprises FDY, HOY, and POY blended polyester filaments and staple fibers; the spinning speed of the staple fibers is 1000 to 1600 m / min, the spinning speed of the POY is 2500 to 3300 m / min, the initial spinning speed of the FDY is 1300 to 1800 m / min, the stretching spinning speed of the FDY is 4000 to 4600 m / min, and the spinning speed of the HOY is 4800 to 5800 m / min.

[0018] As a preferred embodiment, when spinning filaments, the total line density is 55-167 dtex, the line density of filaments and short fibers is 1.5-8 dtex, and the actual hollowness of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers is 20%-30%.

[0019] Beneficial effects:

[0020] The preparation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber provided in the present embodiment selects high-viscosity polyester with a characteristic viscosity of 0.76 to 0.86 as the main melt. Since the apparent viscosity of the polyester melt is high, the bonding strength of the melt in the gap between the openings of the spinneret holes (i.e., the gap between two adjacent melt channels of each spinneret unit) is increased due to the melt extrusion expansion effect. The melt channel having at least one first bend and at least two second bends has strong support strength, and the formed hollow structure is more stable, so that the spun polyester fiber has better spinnability and can maintain stable hollowness.

[0021] By providing a spinning unit including a plurality of melt flow channels spaced apart along the circumferential direction, the spun polyester fiber has a relatively high hollowness and a hollow cross-section with internal and external grooves. The internal and external grooves formed at the first bend and the second bend of the plurality of melt flow channels increase the number of capillary grooves, thereby having a better capillary effect and improving moisture absorption and perspiration discharge; the relatively high hollowness increases the specific surface area of ​​the fiber, which can give the fiber good air permeability.

[0022] By mixing 5% to 25% of the degree of polymerization P into the polyester melt nThe alkali-soluble polyester with a viscosity of 138 to 150 is used to ensure the spinnability of the blended yarn with high-viscosity polyester. The fiber wall is endowed with the characteristic of potential through micropores after alkali reduction. The excellent alkali solubility of the alkali-soluble polyester is utilized. When the fiber spinning fabric is treated with alkali reduction, the alkali-soluble polyester evenly distributed in the hollow fiber wall is dissolved, so that through micropores are formed in the fiber wall. These micropores enhance the moisture absorption, moisture permeability, breathability and perspiration removal effect of the hollow filaments in the inner and outer grooves. In addition, after the polyester melt is doped with titanium dioxide containing nano zinc oxide, it has a matting effect on the polyester fiber. At the same time, the nano zinc oxide particles can also be dissolved after the fiber spinning fabric is treated with alkali reduction, enhancing the micropore effect on the hollow fiber wall and improving the breathability and moisture absorption of the fiber.

[0023] In summary, the preparation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers provided in this embodiment comprehensively utilizes the groove capillary effect, hollowness, and micropores through the fiber wall, and combines the moisture-absorbing and drying effect of the groove capillary pores, the high-middle hollow air-permeable and soft effect, and the enhanced water absorption and water retention effect through the fiber wall micropores, so that the fiber has differentiated functions such as light weight, warmth retention, moisture absorption and permeability, dryness, breathability, and softness.

[0024] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0025] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 is a schematic structural diagram of a spinneret unit provided in this embodiment;

[0029] Figure 2 is a schematic structural diagram of another spinneret unit provided in this embodiment;

[0030] Figure 3 is a structural schematic diagram of another spinneret unit provided in this embodiment;

[0031] Figure 4 It is a schematic structural diagram of a spinneret provided in this embodiment.

[0032] Description of reference numerals:

[0033] 1. Melt flow channel; 2. First bend; 3. Second bend; 4. Outer capillary; 5. Inner capillary; 6. Spinneret unit; 7. Spinneret plate. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] See also Figures 1 to 4 The present application provides a method for preparing a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber, comprising: selecting a high-viscosity polyester with an intrinsic viscosity of 0.76 to 0.86 as a main melt, mixing 5% to 25% of a polymerization degree P n The alkali-soluble polyester (i.e. COPET) with a carbon content of 138 to 150 is spun through a spinneret 7 to form a moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber.

[0038] The spinneret 7 is provided with one or more spinneret units 6. Each spinneret unit 6 includes a plurality of melt flow channels 1 arranged at intervals along the circumferential direction. Figures 1 to 3 As shown, the melt flow channel 1 has at least one first bend 2 and at least two second bends 3. The first bend 2 is closer to the center of the spinneret unit 6 than the second bend 3, that is, relatively speaking, the first bend 2 is located on the inside and the second bend 3 is located on the outside. After the polyester melt passes through the melt flow channel 1 of the spinneret unit 6, the melts flowing out of adjacent melt flow channels 1 are bonded together to form a moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber with multiple inner and outer groove structures.

[0039] The preparation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers provided in the present embodiment selects high-viscosity polyester with a characteristic viscosity of 0.76 to 0.86 as the main melt. Since the apparent viscosity of the polyester melt is high, the bonding strength of the melt in the gap between the openings of the spinneret 7 holes (i.e., the gap between two adjacent melt channels 1 of each spinneret unit 6) is increased due to the melt extrusion expansion effect. The melt channel 1 having at least one first bend 2 and at least two second bends 3 has a strong supporting force, and the hollow structure formed is more stable, so that the spun polyester fiber has better spinnability and can maintain a stable hollowness.

[0040] By providing a spinning unit 6 including a plurality of melt channels 1 spaced apart along the circumferential direction, the spun polyester fiber has a relatively high hollowness and a hollow cross section with internal and external grooves. The internal and external grooves formed by the first bend 2 and the second bend 3 of the plurality of melt channels 1 increase the number of capillary grooves, thereby having a better capillary effect and improving moisture absorption and perspiration discharge; the relatively high hollowness increases the specific surface area of ​​the fiber, which can give the fiber good air permeability.

[0041] By mixing 5% to 25% of the degree of polymerization P into the polyester melt n The alkali-soluble polyester with an alkali content of 138 to 150 is endowed with the characteristic of potential through micropores in the fiber wall after alkali reduction, while ensuring the spinnability of the blended yarn with high-viscosity polyester. The excellent alkali solubility of the alkali-soluble polyester is utilized. When the fiber-spun fabric is subjected to alkali reduction treatment, the alkali-soluble polyester evenly distributed in the hollow fiber wall is dissolved, so that through micropores are formed in the fiber wall. These micropores enhance the moisture absorption, breathability and perspiration removal effects of the hollow filaments in the inner and outer grooves.

[0042] In summary, the preparation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers provided in this embodiment comprehensively utilizes the groove capillary effect, hollowness, and micropores through the fiber wall, and combines the moisture-absorbing and drying effect of the groove capillary pores, the high-middle hollow air-permeable and soft effect, and the enhanced water absorption and water retention effect through the fiber wall micropores, so that the fiber has differentiated functions such as light weight, warmth retention, moisture absorption and permeability, dryness, breathability, and softness.

[0043] In this embodiment, a high-viscosity polyester with an intrinsic viscosity of 0.76 to 0.86 is selected as the main melt to increase spinnability and maintain the stability of hollowness, avoid hollow collapse when spinning multi-gap high-hollowness hollow fibers, and form an effective hollow cross-section. Compared with conventional polyester with an intrinsic viscosity of 0.62 to 0.68, conventional polyester can produce conventional POY, FDY, HOY and short fibers, but when spinning hollow fibers with higher hollowness, due to the low apparent viscosity of the melt, the 7-hole type of the hollow spinneret is usually a 2C or 3C arc structure, and the skeleton support effect is small, it is easy to collapse hollow, which limits the normal production of high-hollowness polyester fibers. Therefore, the embodiment of this application uses a high-viscosity polyester with an intrinsic viscosity of 0.76 to 0.86 as the main melt.

[0044] More preferably, a content of 8% to 15% of the polymerization degree P is mixed into the polyester melt. n The alkali-soluble polyester COPET of 138 to 150 (i.e., the alkali-soluble polyester accounts for 8% to 15% of the total weight of the polyester melt), and the polyester melt is a high-viscosity polyester with a characteristic viscosity of 0.78 to 0.82. Under the premise of ensuring the spinnability of the blended yarn with the high-viscosity polyester, the fiber wall is given the characteristic of potential through micropores produced by alkali reduction, thereby enhancing the moisture absorption, moisture permeability, breathability and perspiration removal effects of the hollow filaments in the inner and outer grooves, and the controllable micropores that can be dissolved by hot alkaline water can be distributed on the hollow wall of the fiber with a relatively small COPET content.

[0045] In this embodiment, a nanometer alkaline earth metal salt or its oxide and alkali-soluble amphoteric metal oxide with a content of 0.1% to 1.0% can be mixed into the polyester melt. Among them, the nanometer alkaline earth metal salt is one of magnesium carbonate, calcium carbonate, strontium carbonate, barium carbonate, and barium sulfate. The nanometer alkaline earth metal salt oxide and alkali-soluble amphoteric metal oxide are one of calcium oxide, magnesium oxide, zinc oxide, and aluminum oxide. The application of nanometer alkaline earth metal salt, nanometer alkaline earth metal salt oxide and alkali-soluble amphoteric metal oxide allows the nanometer alkaline earth metal salt to contain a small amount of nanometer inorganic particles in the hollow fiber wall, and these particles can be dissolved by a hot sodium hydroxide solution, so that the hollow fiber wall will generate micropores when the alkali is reduced, thereby improving the fiber's moisture absorption, air permeability, and water retention.

[0046] In this embodiment, a trace amount of inorganic nano zinc oxide is also mixed into the polyester melt, and titanium dioxide doped with nano zinc oxide is mixed into the polyester melt, the addition amount of titanium dioxide doped with nano zinc oxide is 0.25% to 0.5% of the polyester melt, and the content of nano zinc oxide is 15% to 30% of the content of titanium dioxide. The titanium dioxide doped with zinc oxide is prepared by utilizing the doping characteristics of nano titanium dioxide and trace zinc oxide. Under the premise of ensuring the spinnability of polyester, the nano zinc oxide can be evenly distributed into the inner wall of the blended polyester fiber, and cooperates with COPET to form potential alkali-soluble micro-holes. When the fiber fabric is treated with alkali reduction, it is dissolved together with COPET to form through micro-pores, thereby enhancing the air permeability, hygroscopicity and water retention of the fiber, and improving the wearing comfort of the polyester fabric.

[0047] In one embodiment, the melt channel 1 has a first bend 2 and two second bends 3, so that the melt channel 1 is W-shaped. In order to make the spun polyester fiber have a high hollowness and a hollow cross-section with inner and outer grooves, the W-shaped melt channel 1 is set asymmetrically.

[0048] like Figure 1 As shown, in one embodiment, the included angles of the two second bends 3 are different; Figure 2 and Figure 3 As shown, in another embodiment, the angles of the two second bends 3 can be equal. Preferably, the angle of the first bend 2 and / or the second bend 3 is less than 30°. In an optimal embodiment, the angle of the first bend 2 and the second bend 3 are both less than 30°.

[0049] Preferably, the W-shaped melt channel 1 has two sub-channels located on both sides and two sub-channels located in the middle, and the four sub-channels are connected in sequence through the second bend 3, the first bend 2 and the second bend 3. The first bend 2 and / or the second bend 3 are preferably a curved structure with a predetermined curvature, and the four sub-channels are straight channels. Preferably, the lengths of the two sub-channels located in the middle are equal, and the lengths of the two sub-channels located on both sides are not equal. Among them, the length of the longer sub-channel of the two sub-channels located on both sides can be equal to the length of the two sub-channels located in the middle. In two adjacent melt channels 1, the shorter sub-channel of the two sub-channels located on both sides of one melt channel 1 is adjacent to the longer sub-channel of the two sub-channels located on both sides of the other melt channel 1.

[0050] like Figures 1 to 3As shown, the melt flow channel 1 in the embodiment of the present application is a through hole on the spinneret 7. The first bend 2 forms an outer capillary 4, and the second bend 3 forms an inner capillary 5. The outer capillary 4 is located on the outer side of the melt flow channel 1, and the inner capillary 5 is located on the inner side of the melt flow channel 1. It should be noted that the "inside" and "outside" in this embodiment are based on the distance from the center of the spinneret unit 6, the closer to the center is the inner side, and the farther from the center is the outer side.

[0051] Preferably, the number of melt flow channels 1 is at least four, so that the number of grooves of the outer capillary 4 is greater than or equal to four, and the number of grooves of the inner capillary 5 is greater than or equal to eight. Figure 1 As shown, the number of melt flow channels 1 is four; Figure 2 As shown, the number of melt flow channels 1 is five; Figure 3 As shown, the number of melt channels 1 is six. Preferably, the multiple melt channels 1 of the spinneret unit 6 are evenly spaced and arranged along the circumferential direction. When the number of melt channels 1 is an even number, such as Figure 1 and Figure 3 As shown, the spinning unit 6 is centrally symmetrical as a whole.

[0052] like Figures 1 to 4 As shown, the spinneret 7 provided in the embodiment of the present application has a plurality of internal and external grooves (i.e., capillary grooves). The capillary grooves can quickly absorb moisture and can contain the moisture in the grooves to ensure that the protruding parts of the fibers in contact with the skin are dry.

[0053] In this embodiment, the distance between two adjacent melt channels 1 in the spinneret unit 6 is 0.08-0.20 mm, more preferably 0.08-0.15 mm. Due to the melt expansion effect and contraction effect of the melt during melt spinning through the spinneret 7, the fiber opening ends flowing out of each melt channel merge together to form a hollow fiber with multiple internal and external groove structures.

[0054] Preferably, the equivalent diameter of each spinning unit 6 is 0.08 mm to 0.25 mm, more preferably 0.12 mm to 0.18 mm. n is the number of melt channels in the spinneret unit 6 (eg, 4, 5, 6, etc.), S is the area of ​​a single melt channel in the spinneret unit 6, and L is the circumference of a single melt channel in the spinneret unit 6.

[0055] In this embodiment, the theoretical hollowness of each spinneret unit 6 is greater than or equal to 65%, and more preferably, the theoretical hollowness is greater than 65%. Theoretical hollowness = area surrounded by the inner walls of multiple melt flow channels / area surrounded by the outer walls of multiple melt flow channels × 100%. The area surrounded by the inner walls of multiple melt flow channels is the designed hollow area of ​​the micropores, and the area surrounded by the outer walls of multiple melt flow channels is the designed outer area of ​​the micropores.

[0056] like Figure 4 As shown, the spinneret 7 provided in this embodiment may be provided with a plurality of identical or different spinneret units 6. The present application does not impose a sole limitation on the position and number of the spinneret units 6 on the spinneret 7. Figure 4 This is just a schematic diagram of one of the arrangements.

[0057] Based on the same concept, the present invention also provides a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber, as described in the following embodiments. It should be noted that the moisture-absorbing, dry, breathable, sweat-conducting hollow fiber provided in this embodiment is made by the preparation method of the moisture-absorbing, dry, breathable, sweat-conducting hollow fiber described in any of the above embodiments.

[0058] Example 1

[0059] Melt-spun FDY filament, product specification 167dtex / 24f, single filament linear density 6.95dtex, FDY initial speed 1450m / min, drafting speed 4100m / min, spinneret micropores surrounded by 5 melt flow channels 2, theoretical hollowness 72%, equivalent diameter 0.19mm, opening gap (i.e., the distance between two adjacent melt flow channels 1 in the spinneret unit 6) 0.1mm, polyester melt intrinsic viscosity 0.78, degree of polymerization P n =140 COPET content is 12%, the titanium dioxide content doped with nano zinc oxide is 0.4% of the polyester melt, wherein the nano zinc oxide content is 20% of the titanium dioxide content. According to the above conditions, FDY filaments with 5 outer capillary grooves and 10 inner capillary grooves and a hollowness of 27% can be obtained.

[0060] Example 2

[0061] Melt-spun staple fibers, single-filament linear density Dpf4.8dtex, spinning speed 1200m / min, spinneret micropores surrounded by 6 melt flow channels 2, theoretical hollowness 80%, equivalent diameter 0.15mm, opening gap 0.12mm, polyester melt intrinsic viscosity 0.80, degree of polymerization P n =145 COPET content is 15%, the titanium dioxide content doped with nano zinc oxide is 0.45% of the polyester melt, of which the nano zinc oxide content is 17% of the titanium dioxide content. According to the above conditions, short fibers with 6 outer capillary grooves, 12 inner capillary grooves and a hollowness of 30% can be obtained.

[0062] Example 3

[0063] Melt-spun POY filament, POY specification 181dtex / 36f, single filament linear density 5.02dtex, spinning speed 3000m / min, spinneret micropores surrounded by 4 melt flow channels 2, theoretical hollowness 66%, equivalent diameter 0.12mm, opening gap 0.09mm, polyester melt intrinsic viscosity 0.76, degree of polymerization P n =138 COPET content is 9%, the titanium dioxide content doped with nano zinc oxide is 0.38% of the polyester melt, of which the nano zinc oxide content is 30% of the titanium dioxide content. According to the above conditions, POY filaments with 4 outer capillary grooves and 8 inner capillary grooves and a hollowness of 26% can be obtained.

[0064] Example 4

[0065] Melt-spun HOY filament, HOY specification 110dtex / 24f, single filament linear density 4.58dtex, spinning speed 5200m / min, using spinneret micropores surrounded by 4 melt flow channels 2, theoretical hollowness 65%, equivalent diameter 0.10mm, opening gap 0.09mm, polyester melt intrinsic viscosity 0.78, degree of polymerization P n =138 COPET content is 10%, the titanium dioxide content doped with nano zinc oxide is 0.32% of the polyester melt, wherein the nano zinc oxide content is 25% of the titanium dioxide content. According to the above conditions, HOY filaments with 4 outer capillary grooves and 8 inner capillary grooves and a hollowness of 23% can be obtained.

[0066] Table 1 Moisture-absorbing, dry, breathable, sweat-conducting hollow fiber spinning and characteristic indicators

[0067]

[0068] In this embodiment, the implementation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber corresponds to the implementation method of its preparation method. It can solve the technical problems solved by the implementation method of the preparation method and correspondingly achieve the technical effects of the implementation method of the preparation method. The specific details of this application will not be repeated here.

[0069] Specifically, the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers include FDY, HOY, and POY blended polyester filaments and staple fibers. The spinning speed of the staple fibers is 1000 to 1600 m / min, the spinning speed of POY is 2500 to 3300 m / min, the initial spinning speed of FDY is 1300 to 1800 m / min, the draft spinning speed of FDY is 4000 to 4600 m / min, and the spinning speed of HOY is 4800 to 5800 m / min.

[0070] When spinning filaments, the total line density of this fiber is 55-167dtex, and the single-filament line density can be 1-8dtex. The single-filament line density of filaments and staple fibers is 1.5-8dtex, and the actual hollowness of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers is 20%-30%. Furthermore, the actual hollowness of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers is 25%-30%. There are multiple capillary grooves inside and outside the fiber cross section, which can quickly guide sweat and sweat moisture away from the skin surface, allowing sweat and sweat moisture to evaporate faster, keeping the skin dry and comfortable, and lastingly comfortable and breathable. The textiles woven with this fiber have micropores through the hollow wall of the fiber after alkali reduction treatment, which further enhances the fiber's water absorption, breathability, sweat absorption, and thermal insulation properties, and improves the comfort of human body wearing.

[0071] The moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers provided in the embodiments of the present application are dedicated to the internal circulation in the moisture conduction process of textile fabrics, improving the hot and humid environment of the human body and the inside of clothing, and can help the wearer maintain a comfortable body feeling regardless of moderate or high-intensity exercise. The fibers can be applied to various textile products such as dry and breathable fabrics for sports, fashion, underwear, and home furnishings.

[0072] It should be noted that, in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise specified, the meaning of "plurality" is two or more.

[0073] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in the specification in a similar manner.

[0074] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0075] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0076] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0077] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A method for preparing a moisture-absorbing, dry, breathable, sweat-conducting hollow fiber, characterized in that: include: A high viscosity polyester with an intrinsic viscosity of 0.78-0.82 is selected as the main melt, and 8%-15% polymerization degree P is mixed into the polyester melt. n The alkali-soluble polyester with a content of 138 to 150 is used to spin a moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber through a spinneret; wherein the spinneret is provided with one or more spinnerets; each of the spinnerets comprises a plurality of melt flow channels spaced apart along the circumferential direction; The melt flow channel has at least one first bend and at least two second bends, the first bend is closer to the center of the spinneret unit than the second bend; after the polyester melt passes through the melt flow channel of the spinneret unit, the melts flowing out of adjacent melt flow channels are bonded together to form the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers with multiple inner and outer groove structures; the melt flow channel is W-shaped, the W-shaped melt flow channel is asymmetrical, and the angles between the first bend and the second bend are both less than 30°; the W-shaped melt flow channel has two sub-flow channels located on both sides and two sub-flow channels located in the middle, and the four sub-flow channels are arranged in a circle. The melt flow channels are connected through the second bend, the first bend and the second bend; the first bend and / or the second bend are curved structures with a predetermined curvature, and the four sub-flow channels are straight flow channels; the two sub-flow channels in the middle are of equal length, and the two sub-flow channels on both sides are of unequal length; the length of the longer sub-flow channel on both sides is equal to the length of the two sub-flow channels in the middle; of the two adjacent melt flow channels, the shorter sub-flow channel on both sides of one melt flow channel is adjacent to the longer sub-flow channel on both sides of the other melt flow channel.

2. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: Mixing 0.1% to 1.0% of nanometer alkaline earth metal salts or their oxides and alkali-soluble amphoteric metal oxides into the polyester melt; The nano alkaline earth metal salt is one of magnesium carbonate, calcium carbonate, strontium carbonate, barium carbonate and barium sulfate; the nano alkaline earth metal salt oxide and alkali-soluble amphoteric metal oxide are one of calcium oxide, magnesium oxide, zinc oxide and aluminum oxide.

3. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: Titanium dioxide doped with nano zinc oxide is mixed into the polyester melt, the addition amount of the titanium dioxide doped with nano zinc oxide is 0.25% to 0.5% of the polyester melt, and the content of the nano zinc oxide is 15% to 30% of the content of the titanium dioxide.

4. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: The number of the melt flow channels is at least four, and the melt flow channels have a first bend and two second bends; the first bend forms an outer capillary, the second bend forms an inner capillary, the number of the outer capillary grooves is greater than or equal to four, and the number of the inner capillary grooves is greater than or equal to eight.

5. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: The distance between two adjacent melt flow channels in the spinneret unit is 0.08-0.20 mm.

6. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: The equivalent diameter of the spinning unit is 0.08 mm to 0.25 mm, and the equivalent diameter D=4× ; wherein n is the number of the melt flow channels in the spinneret unit, s is the area of ​​a single melt flow channel in the spinneret unit, is the circumference of a single melt flow channel in the spinning unit.

7. The method for preparing the moisture-absorbing, dry, breathable and sweat-conducting hollow fiber according to claim 1, characterized in that: The theoretical hollowness of the spinneret unit is greater than or equal to 65%, and the theoretical hollowness=the area enclosed by the inner walls of the plurality of melt flow channels / the area enclosed by the outer walls of the plurality of melt flow channels×100%.

8. A moisture-absorbing, dry, breathable, sweat-conducting hollow fiber, characterized in that: The moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber is made by the preparation method of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber as described in any one of claims 1 to 7, and the moisture-absorbing, dry, breathable, and sweat-conducting hollow fiber comprises FDY, HOY, and POY blended polyester filaments and short fibers; the spinning speed of the short fibers is 1000~1600m / min, the spinning speed of the POY is 2500~3300m / min, the initial spinning speed of the FDY is 1300~1800m / min, the stretching spinning speed of the FDY is 4000~4600m / min, and the spinning speed of the HOY is 4800~5800m / min.

9. The moisture-absorbing, dry, breathable, sweat-conducting hollow fiber according to claim 8, characterized in that: When spinning filaments, the total line density is 55-167 dtex, the line density of filaments and staple fibers is 1.5-8 dtex, and the actual hollowness of the moisture-absorbing, dry, breathable, and sweat-conducting hollow fibers is 20%-30%.

Images