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

Abstract

The invention belongs to the technical field of textiles, and relates to a high-speed moisture-conducting profiled fiber and a preparation method and application thereof. The invention relates to a monofilament of a high-speed moisture-conducting profiled fiber, which is provided with a convex rough surface, and one bulge is arranged every 0.5-2 mu m. The preparation method comprises the following steps: extruding a spinning melt containing 8-15wt% of coating modified functional particles from a special-shaped spinneret plate to obtain pre-oriented yarns, cooling and storing the pre-oriented yarns, and sequentially performing oiling, drafting, false twisting deformation, heat setting and winding to obtain the high-speed moisture-conducting special-shaped fibers, the monofilament of the high-speed moisture-conducting profiled fiber is provided with a convex rough surface, and one bulge is formed every 0.5-2 mu m. According to the application, the high-speed moisture-conducting profiled fibers are spun into high-speed moisture-conducting yarns, and the high-speed moisture-conducting yarns have an excellent moisture-conducting effect and are easy to produce and apply on a large scale.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and relates to a high-speed moisture-conducting special-shaped fiber and a preparation method and application thereof. Background Art

[0002] With the development of today's society, people's requirements for the comfort, functionality and health of textiles are increasing, and fibers and their products are also further developing in the direction of functionalization and differentiation. Among the various properties of fibers, moisture absorption and perspiration performance plays a vital role in textiles, which is directly related to the comfort of wearing and the functionality of products. As a natural fiber, cotton fiber is naturally skin-friendly, comfortable to wear, environmentally friendly and degradable, so it is favored by consumers. However, after a large amount of sweating, due to the good hygroscopicity of cotton fiber, close-fitting cotton clothing will stick to the skin after absorbing sweat, and cannot dry quickly, causing discomfort to the human body. Although chemical fibers such as polyester have excellent wrinkle resistance and shape retention, they are hydrophobic because there is no hydrophilic group in the main chain of the molecule, so the clothing of this material has poor moisture permeability when worn and feels stuffy. Therefore, people are eager to develop a yarn that is soft and comfortable to wear and has excellent moisture absorption and quick-drying properties and a textile made therefrom.

[0003] Existing methods for improving moisture absorption and quick-drying performance include adopting a multi-layer structure, fiber blending or special-shaped fibers, etc.

[0004] The fabric of the multi-layer structure is hydrophilic on the inside and hydrophobic on the outside, so that it has a unidirectional moisture conduction function and achieves moisture absorption and quick drying. For example, patent application CN116080208A discloses a moisture-absorbing and quick-drying fabric and a preparation method thereof, patent application CN117621572A discloses a new type of super-absorbent ice-comfortable polyester fabric and weaving process, patent CN212194491U discloses a fiber fabric that is convenient for moisture absorption and perspiration, and patent application CN109972275A discloses a knitted fabric with unidirectional moisture conduction, double-sided special-shaped, moisture absorption and quick drying functions and a preparation method; however, the fabric of the multi-layer structure is relatively thick, which affects air permeability and moisture conduction, and the weaving process of the multi-layer structure is complicated, which increases the weaving difficulty and cost, and is not conducive to large-scale production and application.

[0005] Fiber blending makes the fabric as a whole have multiple fiber composite functions, such as a composite moisture-absorbing layer, which improves the overall moisture absorption function and achieves moisture absorption and quick drying. For example, patent application CN117364315A discloses a cotton blended staple yarn and a textile made therefrom, and patent CN220409859U discloses a moisture-absorbing composite polyester-cotton yarn; however, fiber blending requires the use of special processing technology, which increases the difficulty and cost of production and is not conducive to large-scale production and application.

[0006] The shaped fiber adopts a multi-groove cross-section design, so that the fiber surface is covered with tiny grooves, which increases the specific surface area, provides more capillary channels, enhances the capillary effect, and achieves moisture absorption and quick drying. For example, patent application CN118407153A discloses a method for preparing multi-groove shaped fibers and fabrics thereof, patent CN219032479U discloses a shaped fiber monofilament and shaped yarn, sun-proof fabrics and sun-proof clothing, and patent application CN104532377A discloses a method for preparing a cool, colored, shaped ultrafine denier polyester filament.

[0007] Although shaped fibers have obvious advantages in achieving moisture absorption and quick-drying functions, their moisture conduction is mainly carried out along the axial direction of the fiber, and the fiber often needs to be treated with hydrophilic and hydrophobic modification. In addition, the grooves and edges between the individual shaped fibers in the shaped fiber multifilament will be interlocked, that is, the edges will be embedded in the grooves. Especially for tows with more network points, the individual shaped fibers are tightly held together, which affects the moisture absorption and quick-drying effect of the shaped fibers.

[0008] The prior art uses fibers of different cross-sections to obtain composite yarns to solve the problem of the mutual interlocking of edges and grooves in shaped fibers. However, the disadvantage of this composite yarn is that the strengths of fibers of different cross-sections are different, which increases the difficulty of composite processing and is not conducive to large-scale production and application.

[0009] In summary, the prior art still has shortcomings in the moisture conduction performance of shaped fibers. Therefore, it is necessary to develop a new high-speed moisture conduction shaped fiber. Summary of the invention

[0010] The purpose of the present invention is to solve the problems existing in the prior art and to provide a high-speed moisture-conducting special-shaped fiber and a preparation method and application thereof.

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

[0012] A high-speed moisture-conducting shaped fiber, the monofilament has a convex rough surface, with one convexity every 0.5~2μm;

[0013] In the shaped fiber multifilament, the grooves and edges between the single shaped fibers are usually embedded in the grooves, forming a phenomenon in which the edges and grooves are interlocked with each other. In particular, after the tow is networked, the higher the network degree, the more obvious the phenomenon of interlocking is. A large number of protrusions are distributed on the surface of the shaped fiber of the present invention, forming a rough fiber surface. When the edges and grooves are interlocked, the rough fiber surface produces a small degree of accumulation. These protrusions can support the grooves and edges between the single shaped fibers and form a large number of microchannels (such as Figure 1 As shown in the figure), the capillary action of the shaped fiber multifilament is enhanced, thereby achieving the effect of high-speed moisture conduction.

[0014] As the preferred technical solution:

[0015] In the high-speed moisture-conducting shaped fiber as described above, each monofilament has the same cross-sectional shape and size.

[0016] As described above, the cross-sectional shape of each monofilament of the high-speed moisture-conducting shaped fiber is a cross, a triangle, a Y, a four-leaf, or a double cross.

[0017] The high-speed moisture-conducting shaped fiber as described above has a network density of 10 to 90 per meter.

[0018] The high-speed moisture-conducting shaped fiber as described above has a specification of 20~150D / 8~96F.

[0019] The present invention also provides a method for preparing a high-speed moisture-conducting shaped fiber as described in any one of the above items, firstly extruding a spinning melt containing 8-15wt% of coated modified functional particles from a shaped spinneret to obtain a pre-oriented yarn, then cooling and storing the pre-oriented yarn, and then sequentially performing oiling, drawing, false twisting, heat setting, and winding to obtain a high-speed moisture-conducting shaped 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 the surface of the functional particles through covalent bonds, and the oligomers and the matrix of the spinning melt are different only in average polymerization degree, and the average polymerization degree of the oligomers is 40-60;

[0022] The drafting multiple is 5.5~6.5 times;

[0023] By controlling the particle size of the coated modified functional particles, the content of the coated modified functional particles in the spinning melt, and the drafting multiple, a large number of protrusions can be formed on the fiber surface.

[0024] As the preferred technical solution:

[0025] In the method 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 storage at a temperature of 20-30°C and a relative humidity of 60-70% for 24 hours;

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

[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] False twist texturing uses a texturing machine with a speed ratio (D / Y) of 1.5~1.7, the first hot box temperature is 150~180℃, and the second hot box temperature is 120~130℃;

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

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

[0032] According to the method described above, the steps for preparing the coated modified functional particles are as follows:

[0033] (a) using a coupling agent to organically modify the functional particles to obtain coupling agent-modified functional particles;

[0034] The coupling agent is one or more of γ-aminopropyl triethoxysilane, γ-(2,3-epoxypropoxy)propyl trimethoxysilane, γ-methacryloxypropyl trimethoxysilane, N-(β-aminoethyl)-γ-aminopropyl trimethoxy(ethyl)silane, n-octyl triethoxysilane, vinyl triethoxysilane, isopropyl triisostearate titanate, isopropoxy tris(dioctyl pyrophosphate acyloxy) titanate, tridecafluorooctyl trimethoxysilane, and perfluorodecyl trimethoxysilane;

[0035] The functional particles are silicon dioxide, titanium dioxide, zinc oxide, cuprous oxide or aluminum oxide, and the 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 is completed in a high-speed blender at a speed of 2500-3000 r / min, a temperature of 80-100°C, and a time of 2-3 h;

[0038] (b) adding the dibasic acid and diol into a reaction kettle, stirring and heating to 200-230°C, controlling the pressure of the reaction system to be 0.2-0.3MPa, adding a catalyst after reacting for 3-5h, controlling the temperature of the reaction system to gradually rise to 260-270°C, evacuating to a vacuum degree of less than 80Pa, reacting for 2-3h, cooling to 230°C, and obtaining an oligomer;

[0039] The dibasic 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 the dibasic acid to the diol is 1:0.9-0.95; the mass of the catalyst is 0.01-0.1% of the mass of the dibasic acid;

[0041] (c) adding the coupling agent modified functional particles to the reaction system of step (b), stirring at high speed to fully mix, keeping the temperature for reaction for 0.5 to 1 hour, continuously evacuating, discharging, cooling, pre-crushing, and airflow crushing 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] According to the method described above, the preparation process of the spinning melt is: first, resin A and the coated modified functional particles are melt-blended to obtain a masterbatch with a concentration of 50~65wt%, and then the masterbatch is melt-blended with resin B to obtain a spinning melt, wherein resin A and resin B are the same substance.

[0044] The present invention also provides a high-speed moisture-conducting yarn, which is spun from a high-speed moisture-conducting shaped fiber as described in any of the above items; the dynamic moisture transfer method is used to evaluate the moisture conductivity of the yarn (reference standard GB / T 21655.2-2019 Evaluation of moisture absorption and quick-drying properties of textiles Part 2: Dynamic moisture transfer method), the wetting time of the high-speed moisture-conducting yarn is 1~2s, the water absorption rate is>100% / s, the maximum wetting radius is 25~30mm, the liquid water diffusion rate is>4mm / s, and the unidirectional transfer index is>300.

[0045] Beneficial effects:

[0046] (1) The high-speed moisture-conducting shaped fiber of the present invention has a rough surface by forming a large number of protrusions on the surface of the shaped fiber. These protrusions are distributed on both sides of the edges of the shaped fiber. When the individual shaped fibers of the tow are entangled, the protrusions on the fiber surface can play a supporting role to prevent the edges and grooves of the shaped fibers from interlocking with each other. At the same time, a large number of microchannels are formed between the individual shaped fibers, thereby enhancing the capillary action of the shaped fibers and improving their moisture-conducting effect.

[0047] (2) The preparation method of the present invention is simple, and the fiber forming process and yarn spinning process are suitable for existing industrial production equipment, and are easy to mass produce and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is the protruding structure and microchannel on the surface of the special-shaped fiber. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

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

[0051] Network degree: refer to FZT 50001 "Test method for network degree of synthetic fiber" process test.

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

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

[0054] Example 1

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

[0056] (1) Preparation of raw materials;

[0057] Coupling agent: γ-aminopropyltriethoxysilane;

[0058] Functional particles: silicon dioxide;

[0059] Dibasic 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 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 are organically modified with a coupling agent for 2.5 hours to obtain coupling agent-modified functional particles; wherein the mass of the coupling agent is 5% of the mass of the functional particles;

[0065] (2.2) Add the dibasic acid and diol into a reaction kettle, stir and heat to 200°C, control the pressure of the reaction system to be 0.2MPa, add the catalyst after reacting for 3.5h, control the temperature of the reaction system to gradually rise to 265°C, evacuate to 63Pa, react for 2.5h and cool to 230°C to obtain a polyester oligomer with an average degree of polymerization of 48; wherein the molar ratio of the dibasic acid to the diol is 1:0.9, and the mass of the catalyst is 0.04% of the mass of the dibasic acid;

[0066] (2.3) Adding coupling agent modified functional particles to the reaction system of step (2.2), stirring to fully mix, keeping the temperature for reaction for 0.8h, continuously evacuating, discharging, cooling, pre-crushing, and air flow crushing to obtain coated modified functional particles with a D50 particle size of 250nm; wherein the mass ratio of coupling agent modified functional particles to polyester oligomer is 6:1;

[0067] (3) preparing a spinning melt;

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

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

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

[0071] Among them, during the oiling process, the speed of the oil tanker is 5 rpm; during the drafting process, the temperature of the first pair of drafting rollers is 100°C, the temperature of the second pair of drafting rollers is 130°C, the temperature of the third pair of drafting rollers is 180°C, and the temperature of the fourth pair of drafting rollers is 200°C; the spinning speed of the first pair of drafting rollers is 400m / min, the spinning speed of the second pair of drafting rollers is 1200m / min, the spinning speed of the third pair of drafting rollers is 2400m / min, and the spinning speed of the fourth pair of drafting rollers is 2600m / min; during the false twist deformation process, the speed ratio is 1.5, the temperature of the first hot box is 160°C, and the temperature of the second hot box is 130°C; the temperature of heat setting is 135°C; the winding speed is 4500m / min;

[0072] The specification of the obtained high-speed moisture-conducting shaped fiber is 20D / 8F, and the network degree is 50 per meter; the monofilament of the high-speed moisture-conducting shaped fiber has a convex rough surface, with one convexity every 0.5-2 μm, and the average distance between two adjacent convexities is 1.6 μm, the size of each monofilament is the same, and the cross-sectional shape of each monofilament is a triangle;

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

[0074] The high-speed moisture-conducting shaped fiber is spun to obtain the high-speed moisture-conducting yarn.

[0075] The high-speed moisture-conductive yarn finally obtained 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 that of Example 1, except that the content of the coated modified functional particles in the spinning melt obtained in step (3) is 6 wt %.

[0078] The final yarn has 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 conductivity of the yarn is significantly reduced in Comparative Example 1. This is because when preparing the spinning melt in Comparative Example 1, the amount of coated modified functional particles added is too low, and a protrusion structure cannot be formed on the surface of the shaped fibers. When the grooves and edges between single shaped fibers are interlocked, the fitting parts cannot be supported, and the capillary action is greatly weakened, which ultimately leads to a significant decrease in the moisture conductivity of the yarn.

[0080] Comparative Example 2

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

[0082] The final yarn has 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 conductivity of the yarn in Comparative Example 2 is significantly reduced. This is because when the particle size of the coated modified functional particles is too small, a protrusion structure cannot be formed on the surface of the shaped fibers. When the grooves and edges between single shaped fibers are interlocked, the fitting parts cannot be supported, and the capillary action is greatly weakened, which ultimately leads to a significant decrease in the moisture conductivity of the yarn.

[0084] Comparative Example 3

[0085] A method for preparing yarn is basically the same as that of 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 has 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, Comparative Example 3 has a significantly reduced moisture conductivity of the yarn. This is because Comparative Example 3 is under-drafted, and the mutual extrusion between the coated modified functional particles during the drafting process is not sufficient to squeeze the coated modified functional particles out of the fiber surface, and cannot form a protrusion structure on the surface of the shaped fiber. When the grooves and edges between single shaped fibers are embedded, the fitting parts cannot be supported, and the capillary action is greatly weakened, which ultimately leads to a significant decrease in the moisture conductivity of the yarn.

[0088] Example 2

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

[0090] (1) Preparation of raw materials;

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

[0092] Functional particles: titanium dioxide;

[0093] Dibasic 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 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 are organically modified with a coupling agent for 2.8 h to obtain coupling agent-modified functional particles; wherein the mass of the coupling agent is 3% of the mass of the functional particles;

[0099] (2.2) Add the dibasic acid and diol into a reaction kettle, stir and heat to 210°C, control the pressure of the reaction system to be 0.23MPa, add the catalyst after reacting for 3h, control the temperature of the reaction system to gradually rise to 268°C, evacuate to 68Pa, react for 2h and cool to 230°C to obtain a polyester oligomer with an average degree of polymerization of 40; wherein the molar ratio of the dibasic acid to the diol is 1:0.9, and the mass of the catalyst is 0.01% of the mass of the dibasic acid;

[0100] (2.3) Adding coupling agent modified functional particles to the reaction system of step (2.2), stirring to fully mix, keeping the temperature for reaction for 1 hour, continuously evacuating, discharging, cooling, pre-crushing, and air flow crushing to obtain coated modified functional particles with a D50 particle size of 300 nm; wherein the mass ratio of coupling agent modified functional particles to polyester oligomer is 8:1;

[0101] (3) preparing a spinning melt;

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

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

[0104] The spinning melt is first extruded from a special-shaped spinneret to obtain pre-oriented yarns, and then the pre-oriented yarns are stored at a temperature of 23°C and a relative humidity of 65% for 24 hours, and then oiled (using an oil agent with a concentration of 12wt%), drawn (using four pairs of drawing rollers), false twisted (using a texturing machine), heat-set, and wound to obtain high-speed moisture-conducting special-shaped fibers;

[0105] Among them, during the oiling process, the speed of the oil tanker is 4 rpm; during the drafting process, the temperature of the first pair of drafting rollers is 120°C, the temperature of the second pair of drafting rollers is 150°C, the temperature of the third pair of drafting rollers is 200°C, and the temperature of the fourth pair of drafting rollers is 240°C; the spinning speed of the first pair of drafting rollers is 430m / min, the spinning speed of the second pair of drafting rollers is 1300m / min, the spinning speed of the third pair of drafting rollers is 2500m / min, and the spinning speed of the fourth pair of drafting rollers is 2800m / min; during the false twist deformation process, the speed ratio is 1.5, the temperature of the first hot box is 175°C, and the temperature of the second hot box is 130°C; the temperature of heat setting is 135°C; the winding speed is 4500m / min;

[0106] The specification of the obtained high-speed moisture-conducting shaped fiber is 20D / 24F, and the network degree is 10 per meter; the monofilament of the high-speed moisture-conducting shaped fiber has a convex rough surface, with one convexity every 0.5-2 μm, and the average distance between two adjacent convexities is 0.6 μm, the size of each monofilament is the same, and the cross-sectional shape of each monofilament is a cross;

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

[0108] The high-speed moisture-conducting shaped fiber is spun to obtain the high-speed moisture-conducting yarn.

[0109] The high-speed moisture-conductive yarn finally obtained 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 a high-speed moisture-conducting yarn, the specific steps are as follows:

[0112] (1) Preparation of raw materials;

[0113] Coupling agent: N-(β-aminoethyl)-γ-aminopropyltrimethyl(ethyl)oxysilane;

[0114] Functional particles: zinc oxide;

[0115] Dibasic 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 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 are organically modified with a coupling agent for 2 h to obtain coupling agent-modified functional particles; wherein the mass of the coupling agent is 3.5% of the mass of the functional particles;

[0121] (2.2) Add the dibasic acid and diol into a reaction kettle, stir and heat to 230°C, control the pressure of the reaction system to be 0.3MPa, add the catalyst after reacting for 5h, control the temperature of the reaction system to gradually rise to 270°C, evacuate to 60Pa, react for 3h and cool to 230°C to obtain a polyester oligomer with an average degree of polymerization of 53; wherein the molar ratio of the dibasic acid to the diol is 1:0.92, and the mass of the catalyst is 0.1% of the mass of the dibasic acid;

[0122] (2.3) Adding coupling agent modified functional particles to the reaction system of step (2.2), stirring to fully mix, keeping the temperature for reaction for 1 hour, continuously evacuating, discharging, cooling, pre-crushing, and air flow crushing to obtain coated modified functional particles with a D50 particle size of 200 nm; wherein the mass ratio of coupling agent modified functional particles to polyester oligomer is 7:1;

[0123] (3) preparing a spinning melt;

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

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

[0126] The spinning melt is first extruded from a special-shaped spinneret to obtain pre-oriented yarns, and then the pre-oriented yarns are stored at a temperature of 30°C and a relative humidity of 70% for 24 hours, and then oiled (using an oil agent with a concentration of 10wt%), drawn (using four pairs of drawing rollers), false-twisted (using a texturing machine), heat-set, and wound to obtain high-speed moisture-conducting special-shaped fibers;

[0127] Among them, during the oiling process, the speed of the oil tanker is 4 rpm; during the drafting process, the temperature of the first pair of drafting rollers is 105°C, the temperature of the second pair of drafting rollers is 135°C, the temperature of the third pair of drafting rollers is 190°C, and the temperature of the fourth pair of drafting rollers is 220°C; the spinning speed of the first pair of drafting rollers is 450m / min, the spinning speed of the second pair of drafting rollers is 1200m / min, the spinning speed of the third pair of drafting rollers is 2400m / min, and the spinning speed of the fourth pair of drafting rollers is 2650m / min; during the false twist deformation process, the speed ratio is 1.6, the temperature of the first hot box is 150°C, and the temperature of the second hot box is 120°C; the temperature of heat setting is 145°C; the winding speed is 4800m / min;

[0128] The specification of the obtained high-speed moisture-conducting shaped fiber is 75D / 72F, and the network degree is 90 per meter; the monofilament of the high-speed moisture-conducting shaped fiber has a convex rough surface, with one convexity every 0.5-2 μm, and the average distance between two adjacent convexities is 1 μm, the size of each monofilament is the same, and the cross-sectional shape of each monofilament is Y-shaped;

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

[0130] The high-speed moisture-conducting shaped fiber is spun to obtain the high-speed moisture-conducting yarn.

[0131] The high-speed moisture-conducting yarn finally obtained has 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 a high-speed moisture-conducting yarn, the specific steps are as follows:

[0134] (1) Preparation of raw materials;

[0135] Coupling agent: isopropyl triisostearate titanate;

[0136] Functional particles: cuprous oxide;

[0137] Dibasic 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 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 are organically modified with a coupling agent for 3 hours to obtain coupling agent-modified functional particles; wherein the mass of the coupling agent is 4.5% of the mass of the functional particles;

[0143] (2.2) Add the dibasic acid and diol into a reaction kettle, stir and heat to 200°C, control the pressure of the reaction system to be 0.28MPa, add the catalyst after reacting for 4h, control the temperature of the reaction system to gradually rise to 260°C, evacuate to 72Pa, react for 2.5h and cool to 230°C to obtain a polyester oligomer with an average degree of polymerization of 60; wherein the molar ratio of the dibasic acid to the diol is 1:0.95, and the mass of the catalyst is 0.08% of the mass of the dibasic acid;

[0144] (2.3) Adding coupling agent modified functional particles to the reaction system of step (2.2), stirring to fully mix, keeping the temperature for reaction for 0.5h, continuously evacuating, discharging, cooling, pre-crushing, and air flow crushing to obtain coated modified functional particles with a D50 particle size of 50nm; wherein the mass ratio of coupling agent modified functional particles to polyester oligomer is 5:1;

[0145] (3) preparing a spinning melt;

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

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

[0148] The spinning melt is first extruded from a special-shaped spinneret to obtain pre-oriented yarns, and then the pre-oriented yarns are stored at a temperature of 30°C and a relative humidity of 65% for 24 hours, and then oiled (using an oil agent with a concentration of 18wt%), drawn (using four pairs of drawing rollers), false-twisted (using a texturing machine), heat-set, and wound to obtain high-speed moisture-conducting special-shaped fibers;

[0149] Among them, during the oiling process, the speed of the oil tanker is 6 rpm; during the drafting process, the temperature of the first pair of drafting rollers is 110°C, the temperature of the second pair of drafting rollers is 145°C, the temperature of the third pair of drafting rollers is 195°C, and the temperature of the fourth pair of drafting rollers is 235°C; the spinning speed of the first pair of drafting rollers is 500m / min, the spinning speed of the second pair of drafting rollers is 1500m / min, the spinning speed of the third pair of drafting rollers is 2600m / min, and the spinning speed of the fourth pair of drafting rollers is 2800m / min; during the false twist texturing process, the speed ratio is 1.7, the temperature of the first hot box is 180°C, and the temperature of the second hot box is 128°C; the temperature of heat setting is 140°C; the winding speed is 4800m / min;

[0150] The specification of the obtained high-speed moisture-conducting shaped fiber is 100D / 48F, and the network degree is 30 per meter; the monofilament of the high-speed moisture-conducting shaped fiber has a convex rough surface, with one convexity every 0.5-2 μm, and the average distance between two adjacent convexities is 1.8 μm, the size of each monofilament is the same, and the cross-sectional shape of each monofilament is a double cross;

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

[0152] The high-speed moisture-conducting shaped fiber is spun to obtain the high-speed moisture-conducting yarn.

[0153] The high-speed moisture-conductive yarn finally obtained has 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 a high-speed moisture-conducting yarn, the specific steps are as follows:

[0156] (1) Preparation of raw materials;

[0157] Coupling agent: isopropoxy tris(dioctyl pyrophosphate) titanate;

[0158] Functional particles: alumina;

[0159] Dibasic 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 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 are organically modified with a coupling agent for 2.8 hours to obtain coupling agent-modified functional particles; wherein the mass of the coupling agent is 4% of the mass of the functional particles;

[0165] (2.2) Add the dibasic acid and diol into a reaction kettle, stir and heat to 220°C, control the pressure of the reaction system to be 0.25MPa, add the catalyst after reacting for 3.5h, control the temperature of the reaction system to gradually rise to 265°C, evacuate to 75Pa, react for 2.5h and cool to 230°C to obtain a polyester oligomer with an average degree of polymerization of 55; wherein the molar ratio of the dibasic acid to the diol is 1:0.92, and the mass of the catalyst is 0.06% of the mass of the dibasic acid;

[0166] (2.3) Adding coupling agent modified functional particles to the reaction system of step (2.2), stirring to fully mix, keeping the temperature for reaction for 0.6h, continuously evacuating, discharging, cooling, pre-crushing, and air flow crushing to obtain coated modified functional particles with a D50 particle size of 150nm; wherein the mass ratio of coupling agent modified functional particles to polyester oligomer is 6.5:1;

[0167] (3) preparing a spinning melt;

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

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

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

[0171] Among them, during the oiling process, the speed of the oil tanker is 5 rpm; during the drafting process, the temperature of the first pair of drafting rollers is 115°C, the temperature of the second pair of drafting rollers is 145°C, the temperature of the third pair of drafting rollers is 200°C, and the temperature of the fourth pair of drafting rollers is 240°C; the spinning speed of the first pair of drafting rollers is 450m / min, the spinning speed of the second pair of drafting rollers is 1250m / min, the spinning speed of the third pair of drafting rollers is 2400m / min, and the spinning speed of the fourth pair of drafting rollers is 2650m / min; during the false twist deformation process, the speed ratio is 1.6, the temperature of the first hot box is 165°C, and the temperature of the second hot box is 120°C; the temperature of heat setting is 145°C; the winding speed is 5000m / min;

[0172] The specification of the obtained high-speed moisture-conducting shaped fiber is 150D / 96F, and the network degree is 60 per meter; the monofilament of the high-speed moisture-conducting shaped fiber has a convex rough surface, with one convexity every 0.5-2 μm, and the average distance between two adjacent convexities is 1.3 μm, the size of each monofilament is the same, and the cross-sectional shape of each monofilament is a four-leaf shape;

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

[0174] The high-speed moisture-conducting shaped fiber is spun to obtain the high-speed moisture-conducting yarn.

[0175] The high-speed moisture-conductive yarn finally obtained has 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 high-speed moisture-conducting shaped fiber, characterized in that: The monofilament has a rough surface with protrusions, with one protrusion every 0.5~2μm.

2. A high-speed moisture-conducting shaped fiber according to claim 1, characterized in that: Each monofilament has the same cross-sectional shape and dimensions.

3. A high-speed moisture-conducting shaped fiber according to claim 2, characterized in that: The cross-sectional shape of each monofilament is a cross, a triangle, a Y-shape, a four-leaf shape, or a double cross shape.

4. The high-speed moisture-conducting shaped fiber according to claim 1, characterized in that: The network density of high-speed moisture-conducting special-shaped fibers is 10 to 90 per meter.

5. The high-speed moisture-conducting shaped fiber according to claim 1, characterized in that: The specifications of high-speed moisture-conducting special-shaped fibers are 20~150D / 8~96F.

6. A method for preparing a high-speed moisture-conducting shaped fiber as claimed in any one of claims 1 to 5, characterized in that: First, a spinning melt containing 8-15 wt% of coated modified functional particles is extruded from a shaped spinneret to obtain pre-oriented yarns, and then the pre-oriented yarns are cooled and stored, and then oiled, drawn, false-twisted, heat-set, and wound in sequence to obtain high-speed moisture-conducting shaped fibers; 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 the surface of the functional particles through covalent bonds, and the oligomers and the matrix of the spinning melt are different only in average polymerization degree, and the average polymerization degree of the oligomers is 40-60; The drafting multiple is 5.5~6.5 times.

7. The method according to claim 6, characterized in that The oligomer is a polyester oligomer, and the matrix of the spinning melt is polyester.

8. The method according to claim 7, characterized in that Cooling storage means storage at a temperature of 20-30°C and a relative humidity of 60-70% for 24 hours; The concentration of the oil used for oiling is 10~18wt%, and the speed of the oil tanker is 4~6 rpm; 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; False twist texturing uses a texturing machine with a speed ratio of 1.5~1.7, the first hot box temperature is 150~180℃, and the second hot box temperature is 120~130℃; The temperature of heat setting is 135~145℃; The winding speed is 4500~5000m / min.

9. The method according to claim 7, characterized in that: The preparation steps of coated modified functional particles are as follows: (a) using a coupling agent to organically modify the functional particles to obtain coupling agent-modified functional particles; (b) adding the dibasic acid and diol into a reaction kettle, stirring and heating to 200-230°C, controlling the pressure of the reaction system to be 0.2-0.3MPa, adding a catalyst after reacting for 3-5h, controlling the temperature of the reaction system to gradually rise to 260-270°C, evacuating to a vacuum degree of less than 80Pa, reacting for 2-3h, cooling to 230°C, and obtaining an oligomer; The dibasic acid is terephthalic acid; the diol is one or more of ethylene glycol, propylene glycol and butanediol; (c) Add the coupling agent modified functional particles to the reaction system of step (b), stir to fully mix, keep the temperature for reaction for 0.5 to 1 hour, continue to evacuate, discharge, cool, pre-crush, and air flow crush to obtain coated modified functional particles.

10. A high-speed moisture-conducting yarn, characterized in that: It is spun from a high-speed moisture-conducting shaped fiber as described in any one of claims 1 to 5; the high-speed moisture-conducting 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.

Images