High-speed moisture-conducting profiled fiber, and preparation method and application thereof

Abstract

This invention belongs to the field of textile technology and relates to a high-speed moisture-wicking profiled fiber, its preparation method, and its application. The monofilament of the high-speed moisture-wicking profiled fiber has a raised, rough surface with one protrusion every 0.5-2 μm. The preparation method involves first extruding a spinning melt containing 8-15 wt% coated modified functional particles from a profiled spinneret to obtain pre-oriented yarn. After cooling and storing the pre-oriented yarn, it undergoes sequential oiling, drafting, false twisting, heat setting, and winding to obtain the high-speed moisture-wicking profiled fiber. The monofilament of the high-speed moisture-wicking profiled fiber has a raised, rough surface with one protrusion every 0.5-2 μm. The application involves spinning the high-speed moisture-wicking profiled fiber into high-speed moisture-wicking yarn. This high-speed moisture-wicking yarn has excellent moisture-wicking properties and is easy to mass-produce and apply.

Description

Technical Field

[0001] This invention belongs to the field of textile technology and relates to a high-speed moisture-wicking profiled fiber, its preparation method, and its application. Background Technology

[0002] With the development of modern society, people's demands for the comfort, functionality, and health of textiles are increasing, and fibers and their products are further developing towards functionalization and differentiation. Among the various properties of fibers, moisture-wicking performance plays a crucial role in textiles, directly affecting wearing comfort and product functionality. Cotton fiber, as a natural fiber, is naturally skin-friendly, comfortable to wear, environmentally friendly, and biodegradable, thus enjoying great popularity among consumers. However, after heavy sweating, due to the excellent moisture absorption of cotton fibers, cotton clothing worn close to the skin tends to stick to the skin and cannot dry quickly, causing discomfort. While chemical fibers such as polyester have excellent wrinkle resistance and shape retention, they are hydrophobic due to the lack of hydrophilic groups in their molecular backbone, resulting in poor moisture permeability and a stuffy feeling when wearing clothing made from this material. Therefore, there is an urgent need to develop a yarn and textiles made from it that are soft, comfortable to wear, and possess excellent moisture-wicking and quick-drying properties.

[0003] Existing methods to improve moisture absorption and quick-drying performance include using multi-layer structures, fiber blends, or profiled fibers.

[0004] Multi-layered fabrics feature a hydrophilic inner side and a hydrophobic outer side, enabling them to wick away moisture and achieve quick-drying. For example, patent application CN116080208A discloses a moisture-wicking and quick-drying fabric and its preparation method; patent application CN117621572A discloses a novel super-moisture-wicking, ice-relaxing polyester fabric and its weaving process; patent CN212194491U discloses a fiber fabric that facilitates moisture absorption and wicking; and patent application CN109972275A discloses a knitted fabric with unidirectional moisture wicking, double-sided irregular shape, and quick-drying properties, as well as its preparation method. However, multi-layered fabrics are relatively thick, which affects breathability and moisture wicking. Moreover, the weaving process of multi-layered fabrics is complex, increasing the difficulty and cost of weaving, which is not conducive to large-scale production and application.

[0005] Fiber blending gives the fabric the functions of multiple fiber composites, such as composite moisture-absorbing layers, which improves the overall moisture absorption function and achieves quick-drying. For example, patent application CN117364315A discloses a cotton-blended short fiber yarn and textiles made therefrom, and patent CN220409859U discloses a moisture-absorbing composite polyester-cotton yarn. However, fiber blending requires special processing technology, which increases the difficulty and cost of production and is not conducive to large-scale production and application.

[0006] The shaped fibers adopt a multi-groove cross-section design, which makes the fiber surface covered with tiny grooves, increasing the specific surface area, providing more capillary channels, enhancing the capillary effect, and achieving moisture absorption and quick drying. For example, patent application CN118407153A discloses a method for preparing multi-groove shaped fibers and their fabrics, patent CN219032479U discloses a shaped fiber monofilament and shaped yarn, sun protection fabric and sun protection clothing, and patent application CN104532377A discloses a method for preparing a cool-feeling colored shaped ultrafine denier polyester filament.

[0007] Although profiled fibers have obvious advantages in achieving moisture absorption and quick drying, their moisture wicking mainly occurs along the fiber axis, and often requires hydrophilic or hydrophobic modification of the fibers. Moreover, in profiled fiber multifilaments, the grooves and edges between individual profiled fibers will interlock, that is, the edges will embed into the grooves. Especially for filament bundles with many network points, the individual profiled fibers are tightly bound together, which affects the moisture absorption and quick drying effect of profiled fibers.

[0008] Existing technologies use fibers with different cross-sections to create composite yarns, which solves the problem of interlocking of ridges and grooves in irregularly shaped fibers. However, the disadvantage of this type of composite yarn is that fibers with different cross-sections have different strengths, which increases the difficulty of composite processing and is not conducive to large-scale production and application.

[0009] In summary, existing technologies still have shortcomings in the moisture-wicking properties of profiled fibers. Therefore, it is necessary to develop a new high-speed moisture-wicking profiled fiber. Summary of the Invention

[0010] The purpose of this invention is to solve the problems existing in the prior art and to provide a high-speed moisture-wicking profiled fiber, its preparation method and application.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] A high-speed moisture-wicking profiled fiber, wherein the monofilament has a raised, rough surface with one protrusion every 0.5 to 2 μm;

[0013] In profiled multifilaments, the grooves and edges of individual profiled fibers often interlock, resulting in an interlocking phenomenon. This is especially pronounced after the fiber bundle undergoes a network treatment; the higher the network density, the more obvious the interlocking. The profiled fiber surface of this invention has numerous raised structures, creating a rough fiber surface. When the edges and grooves interlock, the rough fiber surface results in less accumulation. These raised structures can support the areas where the grooves and edges of individual profiled fibers meet, forming numerous microchannels (such as...). Figure 1 As shown in the figure, it enhances the capillary effect of the profiled fiber multifilament, thereby achieving a high-speed moisture-wicking effect.

[0014] As a preferred technical solution:

[0015] As described above, a high-speed moisture-wicking profiled fiber has the same cross-sectional shape and size for each monofilament.

[0016] As described above, the cross-sectional shape of each monofilament of the high-speed moisture-wicking profiled fiber is cross-shaped, triangular, Y-shaped, clover-shaped, or double cross-shaped.

[0017] The high-speed moisture-wicking profiled fiber described above has a network density of 10 to 90 fibers per meter.

[0018] The high-speed moisture-wicking profiled fiber described above has specifications of 20~150D / 8~96F.

[0019] The present invention also provides a method for preparing a high-speed moisture-wicking profiled fiber as described in any of the preceding claims. First, a spinning melt containing 8-15 wt% coated modified functional particles is extruded from a profiled spinneret to obtain a pre-oriented yarn. Then, after the pre-oriented yarn is cooled and stored, it is sequentially oiled, drawn, false-twist deformed, heat-set, and wound to obtain a high-speed moisture-wicking profiled fiber.

[0020] The D50 particle size (i.e., median diameter or median particle size) of the coated modified functional particles is 50~300nm;

[0021] The coated modified functional particles include functional particles and oligomers coated on their surface by covalent bonds. The oligomers and the matrix of the spinning melt differ only in their average degree of polymerization. The average degree of polymerization of the oligomers is 40 to 60.

[0022] The draw ratio is 5.5 to 6.5 times;

[0023] Controlling the particle size of the coated modified functional particles, the content of the coated modified functional particles in the spinning melt, and the draw ratio can create a large number of protrusions on the fiber surface.

[0024] As a preferred technical solution:

[0025] As described above, the oligomer is a polyester oligomer, and the matrix of the spinning melt is polyester.

[0026] As described above, cooling storage refers to storing the product for 24 hours at a temperature of 20-30°C and a relative humidity of 60-70%.

[0027] The concentration of the oil used for oiling is 10~18wt%, and the oil tanker speed is 4~6 revolutions per minute;

[0028] Four pairs of drafting rollers are used for drafting; the temperature of the first pair of drafting rollers is 100~120℃, the temperature of the second pair of drafting rollers is 130~150℃, the temperature of the third pair of drafting rollers is 180~200℃, and the temperature of the fourth pair of drafting rollers is 200~240℃; the spinning speed of the first pair of drafting rollers is 400~500m / min, the spinning speed of the second pair of drafting rollers is 1200~1500m / min, the spinning speed of the third pair of drafting rollers is 2400~2600m / min, and the spinning speed of the fourth pair of drafting rollers is 2600~2800m / min.

[0029] The false twist texturing is performed using a texturing machine with a speed ratio (D / Y) of 1.5~1.7, a first hot box temperature of 150~180℃, and a second hot box temperature of 120~130℃.

[0030] The heat setting temperature is 135~145℃;

[0031] The winding speed is 4500~5000m / min.

[0032] The preparation steps of the coated modified functional particles are as follows: (As described above)

[0033] (a) The functional particles are organically modified by using a coupling agent to obtain coupling agent modified functional particles;

[0034] The coupling agent is one or more of the following: γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimeth(eth)oxysilane, n-octyltriethoxysilane, vinyltriethoxysilane, isopropyltriisostearate titanate, isopropoxytris(dioctylpyrophosphate)titanate, tridecafluorooctyltrimethoxysilane, and perfluorodecyltrimethoxysilane.

[0035] The functional particles are silicon dioxide, titanium dioxide, zinc oxide, cuprous oxide or aluminum oxide, and their morphology can be spherical or amorphous nanoparticles;

[0036] The mass of the coupling agent is 3-5% of the mass of the functional particles;

[0037] The organic modification was completed in a high-speed mixer at a speed of 2500~3000 r / min, a temperature of 80~100℃, and a time of 2~3 h.

[0038] (b) Add the diacid and diol to the reactor, stir and heat to 200~230℃, control the pressure of the reaction system to 0.2~0.3MPa, add the catalyst after 3~5h, control the temperature of the reaction system to gradually increase to 260~270℃, evacuate to a vacuum degree below 80Pa, react for 2~3h and then cool down to 230℃ to obtain the oligomer;

[0039] The dicarboxylic acid is terephthalic acid; the diol is one or more of ethylene glycol, propylene glycol, and butanediol; the catalyst is antimony ethylene glycol or tetrabutyl titanate.

[0040] The molar ratio of diacid to diol is 1:0.9~0.95; the mass of the catalyst is 0.01~0.1% of the mass of the diacid;

[0041] (c) Add coupling agent modified functional particles to the reaction system of step (b), stir at high speed to mix them thoroughly, keep the reaction at a constant temperature for 0.5~1h, continuously vacuum, discharge, cool, pre-crush, and air-jet pulverize to obtain coated modified functional particles.

[0042] The mass ratio of the coupling agent-modified functional particles to the oligomers is 5~8:1.

[0043] The method described above involves the following steps for preparing the spinning melt: first, resin A is melt-blended with coated modified functional particles to obtain a masterbatch with a concentration of 50-65 wt%; then, the masterbatch is melt-blended with resin B to obtain the spinning melt, wherein resin A and resin B are the same substance.

[0044] The present invention also provides a high-speed moisture-wicking yarn, spun from a high-speed moisture-wicking profiled fiber as described in any of the preceding claims; the moisture-wicking properties of the yarn are evaluated using the dynamic moisture transfer method (refer to standard GB / T 21655.2-2019 Evaluation of the Moisture Absorption and Quick-Drying Properties of Textiles Part 2: Dynamic Moisture Transfer Method). The high-speed moisture-wicking yarn has a wetting time of 1~2s, a water absorption rate >100% / s, a maximum wetting radius of 25~30mm, a liquid water diffusion rate >4mm / s, and a unidirectional transfer index >300.

[0045] Beneficial effects:

[0046] (1) The high-speed moisture-wicking profiled fiber of the present invention forms a large number of protrusions on the surface of the profiled fiber, giving the profiled fiber a rough surface. These protrusions are distributed on both sides of the ridges of the profiled fiber. When the single profiled fiber of the bundle is wrapped together, the protrusions on the fiber surface can play a supporting role, preventing the ridges and grooves of the profiled fiber from interlocking. At the same time, a large number of microchannels are formed between the single profiled fibers, enhancing the capillary effect of the profiled fiber and improving its moisture-wicking effect.

[0047] (2) The preparation method of the present invention is simple, and the fiber forming process and yarn spinning process are applicable to existing industrial production equipment, making it easy to produce and apply on a large scale. Attached Figure Description

[0048] Figure 1 It consists of protruding structures and microchannels on the surface of irregularly shaped fibers. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0050] The following are the test methods for the relevant performance indicators in each embodiment and comparative example:

[0051] Network density: Tested according to FZT 50001 "Test Method for Network Degree of Synthetic Fiber Networks".

[0052] Linear density: Tested in accordance with standard GB / T 16256-2008.

[0053] Average degree of polymerization: tested using gel permeation chromatography (GPC).

[0054] Example 1

[0055] A method for preparing high-speed moisture-wicking yarn, the specific steps of which are as follows:

[0056] (1) Preparation of raw materials;

[0057] Coupling agent: γ-aminopropyltriethoxysilane;

[0058] Functional particles: silicon dioxide;

[0059] Dicarboxylic acid: terephthalic acid;

[0060] Diol: Ethylene glycol;

[0061] Catalyst: Antimony glycol;

[0062] Resin A and Resin B: Both are PET with an average degree of polymerization of 600;

[0063] (2) Preparation of coated and modified functional particles;

[0064] (2.1) In a high-speed blender, at a speed of 3000 r / min and a temperature of 80 °C, the functional particles were organically modified with a coupling agent for 2.5 h to obtain coupling agent-modified functional particles; wherein, the mass of the coupling agent was 5% of the mass of the functional particles;

[0065] (2.2) The diacid and diol were added to the reactor, stirred and heated to 200°C, and the pressure of the reaction system was controlled at 0.2 MPa. After reacting for 3.5 h, the catalyst was added, and the temperature of the reaction system was gradually increased to 265°C. The system was then evacuated to 63 Pa and reacted for 2.5 h. The temperature was then decreased to 230°C to obtain a polyester oligomer with an average degree of polymerization of 48. The molar ratio of the diacid to the diol was 1:0.9, and the mass of the catalyst was 0.04% of the mass of the diacid.

[0066] (2.3) Add coupling agent modified functional particles to the reaction system of step (2.2), stir to mix thoroughly, keep warm for 0.8h, continuously vacuum, discharge, cool, pre-crush, air-jet pulverize, and obtain coated modified functional particles with D50 particle size of 250nm; wherein, the mass ratio of coupling agent modified functional particles to polyester oligomer is 6:1;

[0067] (3) Preparation of spinning melt;

[0068] First, resin A is melt-blended with coated and modified functional particles to obtain a masterbatch with a concentration of 65 wt%. Then, the masterbatch is melt-blended with resin B to obtain a spinning melt containing 8 wt% coated and modified functional particles.

[0069] (4) Preparation of high-speed moisture-wicking yarn;

[0070] First, the spinning melt is extruded from the shaped spinneret to obtain pre-oriented yarn. Then, the pre-oriented yarn is stored at a temperature of 20℃ and a relative humidity of 60% for 24 hours. Then, it is sequentially oiled (using an oil agent with a concentration of 15wt%), drawn (using four pairs of drawing rollers), false twisted texturing (using a texturing machine), heat set, and wound to obtain high-speed moisture-wicking profiled fiber.

[0071] During the oiling process, the oiler rotates at 5 revolutions per minute; during the drafting process, the temperatures of the first pair of drafting rollers are 100℃, the second pair of drafting rollers are 130℃, the third pair of drafting rollers are 180℃, and the fourth pair of drafting rollers are 200℃; the spinning speeds of the first pair of drafting rollers are 400 m / min, the second pair of drafting rollers are 1200 m / min, the third pair of drafting rollers are 2400 m / min, and the fourth pair of drafting rollers are 2600 m / min; during the false twist texturing process, the speed ratio is 1.5, the temperature of the first heating box is 160℃, and the temperature of the second heating box is 130℃; the heat setting temperature is 135℃; and the winding speed is 4500 m / min.

[0072] The obtained high-speed moisture-wicking profiled fiber has a specification of 20D / 8F and a network density of 50 filaments / meter. The monofilaments of the high-speed moisture-wicking profiled fiber have a raised rough surface, with one protrusion every 0.5~2μm. The average distance between two adjacent protrusions is 1.6μm. Each monofilament has the same size and the cross-sectional shape of each monofilament is triangular.

[0073] (5) Preparation of high-speed moisture-wicking yarn;

[0074] High-speed moisture-wicking profiled fibers are spun to obtain high-speed moisture-wicking yarn.

[0075] The final high-speed moisture-wicking yarn has a wetting time of 1.5s, a water absorption rate of 129% / s, a maximum wetting radius of 28mm, a liquid water diffusion rate of 6.2mm / s, and a unidirectional transfer index of 338.

[0076] Comparative Example 1

[0077] A method for preparing yarn is basically the same as in Example 1, except that the content of the modified functional particles in the spinning melt obtained in step (3) is 6 wt%.

[0078] The final yarn had a wetting time of 2.7s, a water absorption rate of 96% / s, a maximum wetting radius of 22mm, a liquid water diffusion rate of 3.5mm / s, and a unidirectional transfer index of 276.

[0079] Compared with Example 1, the moisture-wicking performance of the yarn was significantly reduced. This is because the amount of coating modified functional particles added during the preparation of the spinning melt in Comparative Example 1 was too low, and it could not form a raised structure on the surface of the shaped fiber. When the grooves and edges between individual shaped fibers were interlocked, the interlocked parts could not be supported, the capillary effect was greatly weakened, and the moisture-wicking performance of the yarn was significantly reduced.

[0080] Comparative Example 2

[0081] A method for preparing yarn is basically the same as in Example 1, except that the process parameters of pre-crushing and airflow crushing are adjusted in step (2.3) so that the D50 particle size of the coated modified functional particles is 40nm.

[0082] The final yarn had a wetting time of 2.1s, a water absorption rate of 98% / s, a maximum wetting radius of 23mm, a liquid water diffusion rate of 3.8mm / s, and a unidirectional transfer index of 295.

[0083] Compared with Example 1, the moisture-wicking performance of the yarn was significantly reduced. This is because when the particle size of the coated modified functional particles is too small, they cannot form a raised structure on the surface of the shaped fiber. When the grooves and edges between individual shaped fibers are interlocked, they cannot support the bonding part, and the capillary effect is greatly weakened, which ultimately leads to a significant decrease in the moisture-wicking performance of the yarn.

[0084] Comparative Example 3

[0085] A method for preparing yarn is basically the same as in Example 1, except that in step (4), the spinning speed of the first pair of drafting rollers is 400 m / min, the spinning speed of the second pair of drafting rollers is 800 m / min, the spinning speed of the third pair of drafting rollers is 1500 m / min, and the spinning speed of the fourth pair of drafting rollers is 1800 m / min.

[0086] The final yarn had a wetting time of 3.8s, a water absorption rate of 82% / s, a maximum wetting radius of 19mm, a liquid water diffusion rate of 2.4mm / s, and a unidirectional transfer index of 233.

[0087] Compared with Example 1, the moisture-wicking performance of the yarn in Comparative Example 3 was significantly reduced. This is because the stretching in Comparative Example 3 was insufficient. During the stretching process, the mutual compression between the coated modified functional particles was insufficient to squeeze the coated modified functional particles out of the fiber surface, and a raised structure could not be formed on the surface of the shaped fiber. When the grooves and edges between individual shaped fibers were interlocked, the bonding part could not be supported, the capillary effect was greatly weakened, and the moisture-wicking performance of the yarn was significantly reduced.

[0088] Example 2

[0089] A method for preparing high-speed moisture-wicking yarn, the specific steps of which are as follows:

[0090] (1) Preparation of raw materials;

[0091] Coupling agent: γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0092] Functional particles: Titanium dioxide;

[0093] Dicarboxylic acid: terephthalic acid;

[0094] Diol: Propylene glycol;

[0095] Catalyst: Antimony glycol;

[0096] Resin A and Resin B: Both are PET with an average degree of polymerization of 720;

[0097] (2) Preparation of coated and modified functional particles;

[0098] (2.1) In a high-speed blender, at a speed of 2800 r / min and a temperature of 100 °C, the functional particles were organically modified with a coupling agent for 2.8 h to obtain coupling agent-modified functional particles; wherein, the mass of the coupling agent was 3% of the mass of the functional particles;

[0099] (2.2) The diacid and diol were added to the reactor, stirred and heated to 210°C, and the pressure of the reaction system was controlled at 0.23 MPa. After reacting for 3 hours, the catalyst was added, and the temperature of the reaction system was gradually increased to 268°C. The system was then evacuated to 68 Pa and cooled to 230°C after reacting for 2 hours to obtain a polyester oligomer with an average degree of polymerization of 40. The molar ratio of the diacid to the diol was 1:0.9, and the mass of the catalyst was 0.01% of the mass of the diacid.

[0100] (2.3) Add coupling agent modified functional particles to the reaction system of step (2.2), stir to mix thoroughly, keep warm for 1 hour, continuously vacuum, discharge, cool, pre-crush, air-jet pulverize, and obtain coated modified functional particles with D50 particle size of 300 nm; wherein, the mass ratio of coupling agent modified functional particles to polyester oligomer is 8:1.

[0101] (3) Preparation of spinning melt;

[0102] First, resin A is melt-blended with coated and modified functional particles to obtain a masterbatch with a concentration of 50 wt%. Then, the masterbatch is melt-blended with resin B to obtain a spinning melt containing 15 wt% coated and modified functional particles.

[0103] (4) Preparation of high-speed moisture-wicking yarn;

[0104] First, the spinning melt is extruded from the shaped spinneret to obtain pre-oriented yarn. Then, the pre-oriented yarn is stored at a temperature of 23℃ and a relative humidity of 65% for 24 hours. Then, it is sequentially oiled (using an oil agent with a concentration of 12wt%), drawn (using four pairs of drawing rollers), false twisted texturing (using a texturing machine), heat set, and wound to obtain high-speed moisture-wicking profiled fiber.

[0105] During the oiling process, the oiler rotates at 4 revolutions per minute; during the drafting process, the temperatures of the first pair of drafting rollers are 120℃, the second pair of drafting rollers are 150℃, the third pair of drafting rollers are 200℃, and the fourth pair of drafting rollers are 240℃; the spinning speeds of the first pair of drafting rollers are 430 m / min, the second pair of drafting rollers are 1300 m / min, the third pair of drafting rollers are 2500 m / min, and the fourth pair of drafting rollers are 2800 m / min; during the false twist texturing process, the speed ratio is 1.5, the temperature of the first heating box is 175℃, and the temperature of the second heating box is 130℃; the heat setting temperature is 135℃; and the winding speed is 4500 m / min.

[0106] The obtained high-speed moisture-wicking profiled fiber has a specification of 20D / 24F and a network density of 10 filaments / meter. The monofilaments of the high-speed moisture-wicking profiled fiber have a raised rough surface, with one protrusion every 0.5~2μm. The average distance between two adjacent protrusions is 0.6μm. Each monofilament has the same size and the cross-sectional shape of each monofilament is cross-shaped.

[0107] (5) Preparation of high-speed moisture-wicking yarn;

[0108] High-speed moisture-wicking profiled fibers are spun to obtain high-speed moisture-wicking yarn.

[0109] The final high-speed moisture-wicking yarn has a wetting time of 1.2s, a water absorption rate of 106% / s, a maximum wetting radius of 30mm, a liquid water diffusion rate of 7.5mm / s, and a unidirectional transfer index of 355.

[0110] Example 3

[0111] A method for preparing high-speed moisture-wicking yarn, the specific steps of which are as follows:

[0112] (1) Preparation of raw materials;

[0113] Coupling agent: N-(β-aminoethyl)-γ-aminopropyltrimeth(ethoxysilane);

[0114] Functional particle: Zinc oxide;

[0115] Dicarboxylic acid: terephthalic acid;

[0116] Diol: A mixture of ethylene glycol and propylene glycol in a molar ratio of 1:1;

[0117] Catalyst: Tetrabutyl titanate;

[0118] Resin A and Resin B: Both are PET with an average degree of polymerization of 600;

[0119] (2) Preparation of coated and modified functional particles;

[0120] (2.1) In a high-speed blender, at a speed of 3000 r / min and a temperature of 100 °C, the functional particles were organically modified with a coupling agent for 2 h to obtain coupling agent-modified functional particles; wherein, the mass of the coupling agent was 3.5% of the mass of the functional particles;

[0121] (2.2) The diacid and diol were added to the reactor, stirred and heated to 230°C, and the pressure of the reaction system was controlled at 0.3 MPa. After reacting for 5 h, the catalyst was added, and the temperature of the reaction system was gradually increased to 270°C. The system was then evacuated to 60 Pa and cooled to 230°C after reacting for 3 h to obtain a polyester oligomer with an average degree of polymerization of 53. The molar ratio of the diacid to the diol was 1:0.92, and the mass of the catalyst was 0.1% of the mass of the diacid.

[0122] (2.3) Add coupling agent modified functional particles to the reaction system of step (2.2), stir to mix thoroughly, keep warm for 1 hour, continuously vacuum, discharge, cool, pre-crush, air-jet pulverize, and obtain coated modified functional particles with D50 particle size of 200 nm; wherein, the mass ratio of coupling agent modified functional particles to polyester oligomer is 7:1.

[0123] (3) Preparation of spinning melt;

[0124] First, resin A is melt-blended with coated and modified functional particles to obtain a masterbatch with a concentration of 60 wt%. Then, the masterbatch is melt-blended with resin B to obtain a spinning melt containing 10 wt% coated and modified functional particles.

[0125] (4) Preparation of high-speed moisture-wicking yarn;

[0126] First, the spinning melt is extruded from the shaped spinneret to obtain pre-oriented yarn. Then, the pre-oriented yarn is stored at a temperature of 30℃ and a relative humidity of 70% for 24 hours. Then, it is sequentially oiled (using an oil agent with a concentration of 10wt%), drawn (using four pairs of drawing rollers), false twisted texturing (using a texturing machine), heat set, and wound to obtain high-speed moisture-wicking profiled fiber.

[0127] During the oiling process, the oiler rotates at 4 revolutions per minute; during the drafting process, the temperatures of the first pair of drafting rollers are 105℃, the second pair of drafting rollers are 135℃, the third pair of drafting rollers are 190℃, and the fourth pair of drafting rollers are 220℃; the spinning speeds of the first pair of drafting rollers are 450 m / min, the second pair of drafting rollers are 1200 m / min, the third pair of drafting rollers are 2400 m / min, and the fourth pair of drafting rollers are 2650 m / min; during the false twist texturing process, the speed ratio is 1.6, the temperature of the first heating box is 150℃, and the temperature of the second heating box is 120℃; the heat setting temperature is 145℃; and the winding speed is 4800 m / min.

[0128] The high-speed moisture-wicking profiled fiber has a specification of 75D / 72F and a network density of 90 filaments / meter. The monofilaments of the high-speed moisture-wicking profiled fiber have a raised rough surface, with one protrusion every 0.5~2μm. The average distance between two adjacent protrusions is 1μm. Each monofilament has the same size and the cross-sectional shape of each monofilament is Y-shaped.

[0129] (5) Preparation of high-speed moisture-wicking yarn;

[0130] High-speed moisture-wicking profiled fibers are spun to obtain high-speed moisture-wicking yarn.

[0131] The final high-speed moisture-wicking yarn had a wetting time of 1.8s, a water absorption rate of 148% / s, a maximum wetting radius of 25mm, a liquid water diffusion rate of 4.8mm / s, and a unidirectional transfer index of 329.

[0132] Example 4

[0133] A method for preparing high-speed moisture-wicking yarn, the specific steps of which are as follows:

[0134] (1) Preparation of raw materials;

[0135] Coupling agent: Isopropyl triisostearate titanate;

[0136] Functional particle: Cuprous oxide;

[0137] Dicarboxylic acid: terephthalic acid;

[0138] Diol: Butanediol;

[0139] Catalyst: Tetrabutyl titanate;

[0140] Resin A and Resin B: Both are PET with an average degree of polymerization of 720;

[0141] (2) Preparation of coated and modified functional particles;

[0142] (2.1) In a high-speed blender, at a speed of 2500 r / min and a temperature of 90 °C, the functional particles were organically modified with a coupling agent for 3 h to obtain coupling agent-modified functional particles; wherein, the mass of the coupling agent was 4.5% of the mass of the functional particles;

[0143] (2.2) The diacid and diol were added to the reactor, stirred and heated to 200°C, and the pressure of the reaction system was controlled at 0.28 MPa. After reacting for 4 hours, the catalyst was added, and the temperature of the reaction system was gradually increased to 260°C. The system was then evacuated to 72 Pa and reacted for 2.5 hours before being cooled to 230°C to obtain a polyester oligomer with an average degree of polymerization of 60. The molar ratio of the diacid to the diol was 1:0.95, and the mass of the catalyst was 0.08% of the mass of the diacid.

[0144] (2.3) Add coupling agent modified functional particles to the reaction system of step (2.2), stir to mix thoroughly, keep warm for 0.5h, continuously vacuum, discharge, cool, pre-crush, air-jet pulverize, and obtain coated modified functional particles with D50 particle size of 50nm; wherein, the mass ratio of coupling agent modified functional particles to polyester oligomer is 5:1.

[0145] (3) Preparation of spinning melt;

[0146] First, resin A is melt-blended with coated and modified functional particles to obtain a masterbatch with a concentration of 65 wt%. Then, the masterbatch is melt-blended with resin B to obtain a spinning melt containing 8 wt% coated and modified functional particles.

[0147] (4) Preparation of high-speed moisture-wicking yarn;

[0148] First, the spinning melt is extruded from the shaped spinneret to obtain pre-oriented yarn. Then, the pre-oriented yarn is stored at a temperature of 30℃ and a relative humidity of 65% for 24 hours. Then, it is sequentially oiled (using an oil agent with a concentration of 18wt%), drawn (using four pairs of drawing rollers), false twisted texturing (using a texturing machine), heat set, and wound to obtain high-speed moisture-wicking profiled fiber.

[0149] During the oiling process, the oiler rotates at 6 revolutions per minute; during the drafting process, the temperatures of the first pair of drafting rollers are 110℃, the second pair of drafting rollers are 145℃, the third pair of drafting rollers are 195℃, and the fourth pair of drafting rollers are 235℃; the spinning speeds of the first pair of drafting rollers are 500 m / min, the second pair of drafting rollers are 1500 m / min, the third pair of drafting rollers are 2600 m / min, and the fourth pair of drafting rollers are 2800 m / min; during the false twist texturing process, the speed ratio is 1.7, the temperature of the first heating box is 180℃, and the temperature of the second heating box is 128℃; the heat setting temperature is 140℃; and the winding speed is 4800 m / min.

[0150] The obtained high-speed moisture-wicking profiled fiber has a specification of 100D / 48F and a network density of 30 fibers / meter. The monofilaments of the high-speed moisture-wicking profiled fiber have a raised rough surface, with one protrusion every 0.5~2μm. The average distance between two adjacent protrusions is 1.8μm. Each monofilament has the same size and the cross-sectional shape of each monofilament is a double cross shape.

[0151] (5) Preparation of high-speed moisture-wicking yarn;

[0152] High-speed moisture-wicking profiled fibers are spun to obtain high-speed moisture-wicking yarn.

[0153] The final high-speed moisture-wicking yarn had a wetting time of 1.3s, a water absorption rate of 117% / s, a maximum wetting radius of 28mm, a liquid water diffusion rate of 6.3mm / s, and a unidirectional transfer index of 346.

[0154] Example 5

[0155] A method for preparing high-speed moisture-wicking yarn, the specific steps of which are as follows:

[0156] (1) Preparation of raw materials;

[0157] Coupling agent: isopropoxytris(dioctylpyrophosphate)titanate;

[0158] Functional particles: Alumina;

[0159] Dicarboxylic acid: terephthalic acid;

[0160] Diol: Ethylene glycol;

[0161] Catalyst: Antimony glycol;

[0162] Resin A and Resin B: Both are PET with an average degree of polymerization of 720;

[0163] (2) Preparation of coated and modified functional particles;

[0164] (2.1) In a high-speed blender, at a speed of 2800 r / min and a temperature of 90 °C, the functional particles were organically modified with a coupling agent for 2.8 h to obtain coupling agent-modified functional particles; wherein, the mass of the coupling agent was 4% of the mass of the functional particles;

[0165] (2.2) The diacid and diol were added to the reactor, stirred and heated to 220°C, and the pressure of the reaction system was controlled at 0.25 MPa. After reacting for 3.5 h, the catalyst was added, and the temperature of the reaction system was gradually increased to 265°C. The system was then evacuated to 75 Pa and reacted for 2.5 h. After cooling to 230°C, a polyester oligomer with an average degree of polymerization of 55 was obtained. The molar ratio of the diacid to the diol was 1:0.92, and the mass of the catalyst was 0.06% of the mass of the diacid.

[0166] (2.3) Add coupling agent modified functional particles to the reaction system of step (2.2), stir to mix thoroughly, keep warm for 0.6 h, continuously vacuum, discharge, cool, pre-crush, air-jet pulverize, and obtain coated modified functional particles with D50 particle size of 150 nm; wherein, the mass ratio of coupling agent modified functional particles to polyester oligomer is 6.5:1;

[0167] (3) Preparation of spinning melt;

[0168] First, resin A is melt-blended with coated and modified functional particles to obtain a masterbatch with a concentration of 55 wt%. Then, the masterbatch is melt-blended with resin B to obtain a spinning melt containing 12 wt% coated and modified functional particles.

[0169] (4) Preparation of high-speed moisture-wicking yarn;

[0170] First, the spinning melt is extruded from the shaped spinneret to obtain pre-oriented yarn. Then, the pre-oriented yarn is stored at a temperature of 25℃ and a relative humidity of 60% for 24 hours. Then, it is sequentially oiled (using an oil agent with a concentration of 15wt%), drawn (using four pairs of drawing rollers), false twisted texturing (using a texturing machine), heat set, and wound to obtain high-speed moisture-wicking profiled fiber.

[0171] During the oiling process, the oiler rotates at 5 revolutions per minute; during the drafting process, the temperatures of the first pair of drafting rollers are 115℃, the second pair of drafting rollers are 145℃, the third pair of drafting rollers are 200℃, and the fourth pair of drafting rollers are 240℃; the spinning speeds of the first pair of drafting rollers are 450 m / min, the second pair of drafting rollers are 1250 m / min, the third pair of drafting rollers are 2400 m / min, and the fourth pair of drafting rollers are 2650 m / min; during the false twist texturing process, the speed ratio is 1.6, the temperature of the first heating box is 165℃, and the temperature of the second heating box is 120℃; the heat setting temperature is 145℃; and the winding speed is 5000 m / min.

[0172] The obtained high-speed moisture-wicking profiled fiber has a specification of 150D / 96F and a network density of 60 filaments / meter. The monofilaments of the high-speed moisture-wicking profiled fiber have a raised rough surface, with one protrusion every 0.5~2μm. The average distance between two adjacent protrusions is 1.3μm. Each monofilament has the same size and the cross-sectional shape of each monofilament is a four-lobed shape.

[0173] (5) Preparation of high-speed moisture-wicking yarn;

[0174] High-speed moisture-wicking profiled fibers are spun to obtain high-speed moisture-wicking yarn.

[0175] The final high-speed moisture-wicking yarn had a wetting time of 1.6s, a water absorption rate of 132% / s, a maximum wetting radius of 26mm, a liquid water diffusion rate of 5.4mm / s, and a unidirectional transfer index of 333.

Claims

1. A method for preparing a high-speed moisture-wicking profiled fiber, characterized in that, First, a spinning melt containing 8-15 wt% coated modified functional particles is extruded from a shaped spinneret to obtain pre-oriented yarn. Then, after the pre-oriented yarn is cooled and stored, it is sequentially oiled, drawn, false twisted, heat-set, and wound to obtain high-speed moisture-wicking shaped fiber. The D50 particle size of the coated modified functional particles is 50~300nm; The coated modified functional particles include functional particles and oligomers coated on their surface by covalent bonds. The oligomers and the matrix of the spinning melt differ only in their average degree of polymerization. The average degree of polymerization of the oligomers is 40 to 60. The preparation steps for coated and modified functional particles are as follows: (a) The functional particles are organically modified by using a coupling agent to obtain coupling agent modified functional particles; (b) Add the diacid and diol to the reactor, stir and heat to 200~230℃, control the pressure of the reaction system to 0.2~0.3MPa, add the catalyst after 3~5h, control the temperature of the reaction system to gradually increase to 260~270℃, evacuate to a vacuum degree below 80Pa, react for 2~3h and then cool down to 230℃ to obtain the oligomer; The dicarboxylic acid is terephthalic acid; the diol is one or more of ethylene glycol, propylene glycol, and butanediol. (c) Add coupling agent modified functional particles to the reaction system of step (b), stir to mix thoroughly, keep the reaction at a constant temperature for 0.5~1h, continuously vacuum, discharge, cool, pre-crush, and air-jet pulverize to obtain coated modified functional particles. The draw ratio is 5.5 to 6.5 times; The monofilaments of the high-speed moisture-wicking profiled fiber have a raised, rough surface, with one protrusion every 0.5 to 2 μm; The cross-sectional shape of each monofilament can be cross-shaped, triangular, Y-shaped, four-leaf shaped, or double cross-shaped.

2. The method according to claim 1, characterized in that, The oligomer is a polyester oligomer, and the matrix of the spinning melt is polyester.

3. The method according to claim 2, characterized in that, Cooling storage refers to storing the product for 24 hours at a temperature of 20~30℃ and a relative humidity of 60~70%. The concentration of the oil used for oiling is 10~18wt%, and the oil tanker speed is 4~6 revolutions per minute; Four pairs of drafting rollers are used for drafting; the temperature of the first pair of drafting rollers is 100~120℃, the temperature of the second pair of drafting rollers is 130~150℃, the temperature of the third pair of drafting rollers is 180~200℃, and the temperature of the fourth pair of drafting rollers is 200~240℃; the spinning speed of the first pair of drafting rollers is 400~500m / min, the spinning speed of the second pair of drafting rollers is 1200~1500m / min, the spinning speed of the third pair of drafting rollers is 2400~2600m / min, and the spinning speed of the fourth pair of drafting rollers is 2600~2800m / min. The false twist texturing is performed using a texturing machine with a speed ratio of 1.5 to 1.

7. The temperature of the first heating box is 150 to 180°C, and the temperature of the second heating box is 120 to 130°C. The heat setting temperature is 135~145℃; The winding speed is 4500~5000m / min.

4. The method according to claim 1, characterized in that, Each monofilament has the same cross-sectional shape and size.

5. The method according to claim 1, characterized in that, The network density of high-speed moisture-wicking profiled fibers is 10~90 fibers / meter.

6. The method according to claim 1, characterized in that, The specifications of high-speed moisture-wicking profiled fibers are 20~150D / 8~96F.

7. A high-speed moisture-wicking yarn, characterized in that, The yarn is spun from a high-speed moisture-wicking profiled fiber prepared by the method described in any one of claims 1 to 6; the high-speed moisture-wicking yarn has a wetting time of 1 to 2 seconds, a water absorption rate of >100% / s, a maximum wetting radius of 25 to 30 mm, a liquid water diffusion rate of >4 mm / s, and a unidirectional transfer index of >300.

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