Preparation method of sweat stain-free fabric

Abstract

The invention belongs to the technical field of fabric preparation, and relates to a preparation method of a perspiration-free fabric, which is characterized in that sodium ion adsorption fibers and lipophilic cross-shaped fibers are creatively prepared, the sodium ion adsorption fibers are spun into outer layer yarns and connecting yarns, and the lipophilic cross-shaped fibers and cotton fibers are spun into inner layer yarns, so that the perspiration-free fabric is prepared. And weaving into cloth through a tatting process, and carrying out alkali etching treatment to finally obtain the sweat stain-free fabric. According to the invention, the defects of complex components, low processing efficiency, limited quick-drying property and insufficient air permeability of the inner-layer fabric in the existing technology for solving the problems of sweat permeation and sweat stain are overcome, and the prepared fabric has excellent moisture absorption and sweat releasing properties and also has good air permeability and quick-drying property.

Description

Technical Field

[0001] The present invention belongs to the technical field of fabric preparation and relates to a method for preparing a sweat-free stain fabric. Background Art

[0002] In hot summer or during high-intensity sports, the human body produces a large amount of sweat. Due to the popularity of lightweight clothing, sweat is difficult to evaporate quickly, resulting in the clothing being easily soaked by sweat, thus forming obvious water marks on the clothing surface, and even making the clothing become transparent. This not only affects the wearing comfort but also brings great embarrassment to people, especially for women. In addition, after sweat evaporates, it will leave sweat stains on the clothing surface. These sweat stains are composed of inorganic salts, lactic acid, urea, and oils brought out from the skin, etc. They form white crystal particles or sweat stain rings on the clothing surface, further reducing the wearing experience.

[0003] To solve these problems, a variety of fabrics with moisture absorption and sweat discharge functions have emerged on the market. The current mainstream technology is to achieve the function of moisture absorption and sweat discharge on the inner side (skin-friendly side) of the fabric and the function of waterproof on the outer side (non-skin-friendly side) of the fabric through printing technology or fabric composite technology, that is, the so-called "single-parent and single-prevention" finishing. This technology solves the problems of sweat penetration and sweat stains to a certain extent, but there are still some deficiencies.

[0004] For example, fabrics that commonly achieve "single-parent and single-prevention" finishing through printing technology on the market often have poor air permeability because the chemical treatment agents in the printing process will block the gaps between fabric fibers, resulting in poor air circulation.

[0005] Another example is that the patent application CN118542502A discloses an anti-sweat stain shirt and its preparation process. The shirt is composed of an inner fabric and an outer fabric. The inner fabric is hydrophilic and is obtained by electrospinning a mixture of cotton fiber, bamboo charcoal fiber, modified soy protein isolate, modified nano-expanded perlite, modified silk fiber, hemp fiber, and spinning aids, etc.; the outer fabric is hydrophobic and a water-repellent honeycomb stretch fabric is selected. Although this shirt achieves the anti-sweat stain effect to a certain extent, its inner fabric has complex components, low processing efficiency, and limited quick-drying property. In the case of a large amount of sweating, sweat cannot be quickly discharged, and it is easy to produce a sticky feeling between the clothing and the skin, affecting the wearing comfort.

[0006] In summary, while the existing technology solves the problems of sweat penetration and sweat stains, there are still defects such as insufficient air permeability, limited quick-drying property, and complex components of the inner fabric. Summary of the Invention

[0007] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for preparing a sweat-free stain fabric.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A preparation method of a sweat-free stain fabric, which respectively prepares sodium ion adsorption fibers and lipophilic cross-shaped fibers. The sodium ion adsorption fibers are spun into outer yarns and connecting yarns, and the lipophilic cross-shaped fibers and cotton fibers are spun into inner yarns together, and then woven into fabric by a weaving method, and the fabric is subjected to alkali etching treatment to obtain the sweat-free stain fabric;

[0010] The preparation process of the sodium ion adsorption fiber or the lipophilic cross-shaped fiber is as follows: first, polyester and modified functional particles with an average particle size of 80 - 350 nm are melt-blended to obtain masterbatch, then the masterbatch is subjected to solid-phase reaction, and then the masterbatch after solid-phase reaction is melt-blended with polyester to obtain a spinning melt containing 8 - 15 wt% of modified functional particles, and then the spinning melt is spun, and a draw ratio of 5.5 - 6.5 times is carried out during the spinning process;

[0011] The modified functional particles corresponding to the sodium ion adsorption fiber are high sodium ion adsorption type titanium dioxide functional powder. The preparation process is as follows: after pre-treating polyhexamethylene adipate neopentyl glycol ester, sulfonate polyester diol, and dimethylolpropionic acid, they are successively reacted with isophorone diisocyanate and KH550-modified titanium dioxide nano-powder. In this process, first, polyhexamethylene adipate neopentyl glycol ester, sulfonate polyester diol, and dimethylolpropionic acid undergo an esterification reaction to form a hydroxyl-terminated esterified product. Then, the hydroxyl group in the hydroxyl-terminated esterified product reacts with a part of the isocyanate groups in isophorone diisocyanate. Finally, the remaining isocyanate groups react with the amino groups on the surface of KH550-modified titanium dioxide nano-powder, thereby forming a coating layer on the powder surface. After post-treatment, the high sodium ion adsorption type titanium dioxide functional powder is obtained;

[0012] The modified functional particles corresponding to the lipophilic cross-shaped fiber are lipophilic modified titanium dioxide functional powder, that is, titanium dioxide functional powder with DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine) coated on the surface;

[0013] When preparing the lipophilic cross-shaped fiber, the spinneret holes on the spinneret plate are cross-shaped.

[0014] As a preferred technical solution:

[0015] For the preparation method of a sweat-free stain fabric as described above, the concentration of the masterbatch is 50 - 65 wt%, the solid-phase reaction is carried out in a nitrogen or inert gas atmosphere, the temperature is 190 - 210 °C, and the time is 20 - 30 h.

[0016] For the preparation method of a sweat-free stain fabric as described above, the spinning is directly carried out according to the FDY process.

[0017] A preparation method of a sweat-free stain fabric as described above, in which four pairs of drafting rollers are used for drafting; the temperature of the first pair of drafting rollers is 100 - 120 °C, the temperature of the second pair of drafting rollers is 130 - 150 °C, the temperature of the third pair of drafting rollers is 180 - 200 °C, and the temperature of the fourth pair of drafting rollers is 200 - 240 °C; the spinning speed of the first pair of drafting rollers is 400 - 500 m / min, the spinning speed of the second pair of drafting rollers is 1200 - 1500 m / min, the spinning speed of the third pair of drafting rollers is 2400 - 2600 m / min, and the spinning speed of the fourth pair of drafting rollers is 2600 - 2800 m / min.

[0018] A preparation method of a sweat-free stain fabric as described above, in the preparation process of the high-sodium-ion adsorption type titanium dioxide functional powder, the molar ratio of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate is 6 - 10:4 - 9:1 - 3:2 - 3; the molar amount of KH550-modified titanium dioxide nanoparticles is 2 - 3 times the total molar amount of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate.

[0019] A preparation method of a sweat-free stain fabric as described above, the preparation steps of the high-sodium-ion adsorption type titanium dioxide functional powder are as follows:

[0020] (a) Pre-treat poly(neopentyl glycol adipate), sulfonate polyester diol, and dimethylolpropionic acid at a temperature of 110 - 120 °C and a vacuum degree lower than 80 Pa for 1 - 2 h, then add them to a reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0021] (b) Add isophorone diisocyanate to the reaction kettle, heat up to 80 - 90 °C and keep the temperature for reaction for 4 - 6 h;

[0022] (c) Cool down to 50 °C, first add a solvent (acetone) to the reaction kettle until the product in the reaction kettle is completely dissolved, then add KH550-modified titanium dioxide nanoparticles to the reaction kettle, heat up to 50 - 60 °C and keep the temperature for reaction for 6 - 8 h;

[0023] (d) Remove the solvent in the reaction kettle (by means of vacuum distillation) and the unreacted raw materials (by heating at 130 - 150 °C), obtain a solid, and pulverize the solid (i.e., perform pre-pulverization and jet milling in sequence) to obtain the high-sodium-ion adsorption type titanium dioxide functional powder.

[0024] A preparation method of a sweat-free stain fabric as described above. The preparation process of KH550-modified titanium dioxide nanopowder is as follows: Add KH550 and titanium dioxide nanopowder into a high-speed blender with a rotation speed of 2500 - 3000 r / min, and react at 80 - 100 °C for 2 - 3 h to obtain KH550-modified titanium dioxide nanopowder. Among them, the mass of KH550 is 3 - 5% of the mass of titanium dioxide nanopowder.

[0025] A preparation method of a sweat-free stain fabric as described above. The preparation process of lipophilic-modified titanium dioxide functional powder is as follows: After dissolving DOPE and KH570 in a solvent (ethanol aqueous solution), heat it up to 60 - 80 °C, then add AIBN (azobisisobutyronitrile), keep it warm and stir for reaction for 6 - 10 h, then cool it down to room temperature and add titanium dioxide nanopowder. Adjust the pH value of the system to 7 - 8 with a 0.1 mol / L NaOH aqueous solution, and then stir and react at room temperature for 20 - 24 h. After post-treatment (filtration, vacuum drying at 60 °C), lipophilic-modified titanium dioxide functional powder is obtained.

[0026] A preparation method of a sweat-free stain fabric as described above. The specific process of alkali etching treatment is as follows: Place the fabric in an alkali solution (composed of NaOH, benzyl alcohol and water, the concentration of NaOH is 6 g / L, and the concentration of benzyl alcohol is 3 mL / L), heat it up to 130 °C at a heating rate of 2 °C / min in an infrared dyeing machine, keep it warm for 40 min, and then carry out post-treatment (washing, drying, drying at 105 °C for 2 h); among them, the ratio of fiber to alkali solution is 1 g:50 mL.

[0027] A preparation method of a sweat-free stain fabric as described above. In the preparation process of lipophilic-modified titanium dioxide functional powder, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.03 - 0.05% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder is 50 - 60% of the total mass of DOPE and KH570.

[0028] A preparation method of a sweat-free stain fabric as described above. The specification of sodium ion adsorption fiber is 75 - 100 D / 48 - 72 F, the specification of lipophilic cross-shaped fiber is 20 - 50 D / 36 - 72 F, the linear density of the outer yarn and the connecting yarn is 1.3 - 1.6 dtex, the mass ratio of lipophilic cross-shaped fiber to cotton fiber is 10:1 - 5, and the linear density of the inner yarn is 0.8 - 1.2 dtex.

[0029] A preparation method of a sweat-free stain fabric as described above. The water absorption rate of the sweat-free stain fabric is ≥158%, the wicking height is ≥121 mm, and the drying rate is ≥0.47 g / h, indicating that the fabric has good moisture absorption and sweat discharge properties and good quick-drying properties; the water droplet diffusion time is ≤1.6 s, indicating that sweat can easily spread on the fabric, which is conducive to moisture absorption, sweat discharge and quick drying; the glossiness is 96-99%, indicating that the fabric has good sweat-free stain effect.

[0030] Invention mechanism:

[0031] In the present invention, functional particles after special modification (lipophilic modified titanium dioxide functional powder and high sodium ion adsorption type titanium dioxide functional powder) are blended with a resin matrix, and by controlling the particle size of the modified functional particles, the content of the modified functional particles in the spinning melt, and the draw ratio, fibers with a specific structure (sodium ion adsorption fibers and lipophilic cross-shaped fibers) are prepared by melt spinning. A large number of convex dot matrix structures are present on the surface of these fibers, and this structure plays multiple roles in the fabric, jointly realizing the sweat-free stain effect;

[0032] Grooves are formed between the protrusions. The grooves can utilize capillary action to promote the rapid conduction and spreading of liquids (such as moisture and sweat) on the surface of a single fiber, thereby improving the moisture conduction performance of the fiber. When these fibers are woven into yarns, the convex surface structures of the single filaments support each other, forming a large number of capillary-like channels. These channels enable the fabric made of the yarn of the present invention to conduct liquids in a circular radial manner in the X, Y, and Z directions, further improving the conduction efficiency and spreading area, and having a good quick-drying effect on volatile liquids;

[0033] The raised component on the surface of the lipophilic cross-shaped fibers in the inner layer of yarns is a lipophilic modified titanium dioxide functional powder, that is, a titanium dioxide functional powder coated with DOPE on the surface. The long fatty chain structure of DOPE has strong lipophilicity and can effectively adsorb the grease in sweat, while the moisture can continue to diffuse outward quickly. In this way, the moisture is conducted away, and the grease is fixed on the inner surface of the fabric. The cotton fibers in the inner layer of yarns have strong water absorption, can make the moisture in sweat stay between the inner and outer fabrics, slow down the evaporation of moisture, and prevent the grease from being introduced into the outer fabric, so that the lipophilic cross-shaped fibers can fully adsorb the grease. The raised component on the surface of the outer layer of yarns and the connecting yarns is a high-sodium-ion adsorption type titanium dioxide functional powder. The functional groups on its surface can fully capture the sodium ions in the moisture, thus fixing the salt. In this way, both the grease and the salt are fixed on the inner side of the fabric, preventing them from forming sweat stains and remaining on the surface of the clothing. At the same time, relying on its strong quick-drying property, the outer fabric quickly conducts the moisture in sweat in the form of water vapor through the capillary effect of the fibers, achieving the effect of no sweat stains. In addition, since the fabric in the present invention is directly woven from fibers and has not undergone post-treatment, it can maintain extremely high air permeability. This design not only allows moisture to penetrate from the inner layer to the outer layer of the fabric, but also makes it easier for air to penetrate the fabric, thus effectively solving the problem of insufficient air permeability.

[0034] The high-sodium-ion adsorption type titanium dioxide functional powder on the surface of the sodium-ion adsorption fibers not only reduces the amount of light transmitted into the fabric as a matting agent, but also increases the contact area between the light and the fibers. This makes most of the light undergo diffuse reflection on the surface of the fabric and not penetrate into the interior of the fabric. This optical effect further improves the effect of the fabric having no sweat stains, making the traces formed by sweat on the surface of the fabric less obvious.

[0035] After the outer layer of yarns, the connecting yarns and the inner layer of yarns are woven into a fabric in the present invention, the fabric is also subjected to alkali etching treatment, which can reduce the coating of the resin matrix on the functional particles and enhance the effect of the modified functional particles. At the same time, in the process of preparing the sodium-ion adsorption fibers or the lipophilic cross-shaped fibers in the present invention, a solid-phase reaction is carried out on the masterbatch, which can make the ester groups in the modified functional particles be connected to the polyester molecules, thus effectively preventing the modified functional particles from falling off during the alkali etching treatment.

[0036] Beneficial effects:

[0037] The present invention overcomes the defects existing in the prior art for solving the problems of sweat penetration and sweat stains, such as complex composition of the inner fabric, low processing efficiency, limited quick-drying property, and insufficient air permeability, and prepares a fabric that not only has excellent moisture absorption and sweat discharge performance, but also has good air permeability and quick-drying property. Specific embodiments

[0038] 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 not 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 also fall within the scope defined by the appended claims of this application.

[0039] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0040] Linear density: Tested in accordance with standard GB / T 16256-2008.

[0041] Water absorption rate: Tested in accordance with the water absorption rate detection method in 8.1 of GB / T 21655.1-2023.

[0042] Water droplet diffusion time: Tested in accordance with 8.2 of GB / T 21655.1-2023 for water droplet diffusion time.

[0043] Wicking height: Tested in accordance with 8.4 of GB / T 21655.1-2023 for wicking height.

[0044] Drying rate: Tested in accordance with 8.3 of GB / T 21655.1-2023 for drying rate.

[0045] Glossiness: Tested in accordance with the standard of FZT 01097-2006 "Test Method for Fabric Glossiness".

[0046] Example 1

[0047] A preparation method of a sweat-free stain fabric, the specific steps are as follows:

[0048] (1) Preparation of raw materials;

[0049] KH550;

[0050] Titanium dioxide nanopowder: The average particle size is 150 nm;

[0051] Polyhexylene adipate neopentyl glycol ester: The CAS number is 25214-14-6;

[0052] Sulfonate polyester diol: The manufacturer is Beijing Boyuan Chemical Co., Ltd., and the product number is BY-3305;

[0053] Dimethylolpropionic acid;

[0054] Isophorone diisocyanate;

[0055] Acetone;

[0056] DOPE;

[0057] KH570;

[0058] Ethanol aqueous solution: composed of ethanol and water with a volume ratio of 1:4;

[0059] AIBN;

[0060] NaOH aqueous solution: with a concentration of 0.1 mol / L;

[0061] Polyester: manufactured by Sinopec Yizheng Chemical Fiber Co., Ltd., with the product number FG720;

[0062] Cotton fiber;

[0063] Alkali solution: composed of NaOH, benzyl alcohol and water, with the concentration of NaOH being 6 g / L and the concentration of benzyl alcohol being 3 mL / L;

[0064] (2) Prepare KH550-modified titanium dioxide nanopowder;

[0065] Add KH550 and titanium dioxide nanopowder into a high-speed blender with a rotation speed of 3000 r / min, react at 80 °C for 2.5 h to obtain KH550-modified titanium dioxide nanopowder; among them, the mass of KH550 is 5% of the mass of titanium dioxide nanopowder;

[0066] (3) Prepare high-sodium-ion adsorption type titanium dioxide functional powder and lipophilic modified titanium dioxide functional powder respectively;

[0067] The preparation steps of the high-sodium-ion adsorption type titanium dioxide functional powder are as follows:

[0068] (a) Pretreat poly(hexylene adipate-co-neopentyl glycol adipate), sulfonate polyester diol and dimethylolpropionic acid at 110 °C and a vacuum of 75 Pa for 1 h, then add them into a reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0069] (b) Add isophorone diisocyanate into the reaction kettle, heat up to 85 °C and keep the temperature for reaction for 4.8 h;

[0070] (c) Cool down to 50 °C, first add acetone into the reaction kettle until the product in the kettle is completely dissolved, then add KH550-modified titanium dioxide nanopowder into the reaction kettle, heat up to 55 °C and keep the temperature for reaction for 7.5 h;

[0071] (d) Remove the solvent and unreacted raw materials in the reaction kettle by heating at 140 °C to obtain a solid, pulverize the solid to obtain a high-sodium-ion adsorption type titanium dioxide functional powder with an average particle size of 180 nm;

[0072] In steps (a) to (d), the molar ratio of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate is 8:5:1.5:2; the molar amount of KH550-modified titanium dioxide nanopowder is 2 times the total molar amount of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate;

[0073] The preparation process of the lipophilic modified titanium dioxide functional powder is as follows: Dissolve DOPE and KH570 in an ethanol aqueous solution, then heat to 65 °C, add AIBN, keep stirring and reacting for 8 h, then cool to room temperature and add titanium dioxide nanopowder. Adjust the pH value of the system to 7 with an aqueous NaOH solution, and then stir and react at room temperature for 22 h. After post-treatment, a lipophilic modified titanium dioxide functional powder with an average particle size of 180 nm is obtained; among them, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.05% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder is 55% of the total mass of DOPE and KH570;

[0074] (4) Prepare sodium ion adsorption fibers and lipophilic cross-shaped fibers respectively;

[0075] The preparation process of the sodium ion adsorption fiber is as follows: First, melt-blend polyester with the lipophilic modified titanium dioxide functional powder to obtain masterbatch a with a concentration of 60 wt%, then carry out a solid-phase reaction on masterbatch a at 205 °C for 28 h under a nitrogen or inert gas atmosphere. Then, melt-blend the solid-phase reacted masterbatch a with polyester to obtain a spinning melt a containing 12 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin the spinning melt a according to the FDY process to obtain sodium ion adsorption fibers with a specification of 75D / 48F;

[0076] The preparation process of the lipophilic cross-shaped fiber is as follows: First, melt-blend polyester with the high sodium ion adsorption type titanium dioxide functional powder to obtain masterbatch b with a concentration of 62 wt%, then carry out a solid-phase reaction on masterbatch b at 210 °C for 28 h under a nitrogen or inert gas atmosphere. Then, melt-blend the solid-phase reacted masterbatch b with polyester to obtain a spinning melt b containing 12 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin the spinning melt b according to the FDY process to obtain lipophilic cross-shaped fibers with a specification of 20D / 36F;

[0077] During the spinning process of preparing sodium ion adsorbing fibers and lipophilic cross-shaped fibers, four pairs of drafting rollers are used for drafting. The temperature of the first pair of drafting rollers is 100 °C, the temperature of the second pair of drafting rollers is 135 °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 400 m / min, the spinning speed of the second pair of drafting rollers is 1250 m / min, the spinning speed of the third pair of drafting rollers is 2500 m / min, and the spinning speed of the fourth pair of drafting rollers is 2600 m / min; when preparing lipophilic cross-shaped fibers, the spinneret holes on the spinneret plate are cross-shaped;

[0078] (5)Prepare sweat-free fabric;

[0079] Spin the sodium ion adsorbing fibers into an outer layer yarn with a linear density of 1.6 dtex and a connecting yarn with a linear density of 1.6 dtex, spin the lipophilic cross-shaped fibers and cotton fibers with a mass ratio of 10:4 together into an inner layer yarn with a linear density of 0.8 dtex, weave them into fabric by weaving, and perform alkali etching treatment on the fabric (place the fabric in an alkali solution at a mass-to-volume ratio of 1 g:50 mL, heat it to 130 °C at a heating rate of 2 °C / min, keep it warm for 40 min, and then perform post-treatment), then the sweat-free fabric is obtained.

[0080] The finally obtained sweat-free fabric has a water absorption rate of 163%, a water droplet diffusion time of 1.2 s, a wicking height of 128 mm, a drying rate of 0.49 g / h, and a glossiness of 98%.

[0081] Example 2

[0082] A method for preparing a sweat-free fabric, the specific steps are as follows:

[0083] (1)Preparation of raw materials;

[0084] KH550;

[0085] Titanium dioxide nano powder: average particle size is 50 nm;

[0086] Polyhexamethylene adipate neopentyl glycol ester: CAS number is 25214-14-6;

[0087] Sulfonate polyester diol: manufacturer is Beijing Baiyuan Chemical Co., Ltd., brand is BY-3305;

[0088] Dimethylolpropionic acid;

[0089] Isophorone diisocyanate;

[0090] Acetone;

[0091] DOPE;

[0092] KH570;

[0093] Ethanol aqueous solution: composed of ethanol and water with a volume ratio of 1:5;

[0094] AIBN;

[0095] NaOH aqueous solution: concentration is 0.1 mol / L;

[0096] Polyester: manufactured by Sinopec Yizheng Chemical Fiber Co., Ltd., grade is FG720;

[0097] Cotton fiber;

[0098] Alkali solution: composed of NaOH, benzyl alcohol and water, the concentration of NaOH is 6 g / L, and the concentration of benzyl alcohol is 3 mL / L;

[0099] (2) Prepare KH550-modified titanium dioxide nanopowder;

[0100] Add KH550 and titanium dioxide nanopowder into a high-speed blender with a rotation speed of 2800 r / min, react at 100 °C for 2.8 h to obtain KH550-modified titanium dioxide nanopowder; among them, the mass of KH550 is 3% of the mass of titanium dioxide nanopowder;

[0101] (3) Prepare high-sodium-ion adsorption type titanium dioxide functional powder and lipophilic modified titanium dioxide functional powder respectively;

[0102] The preparation steps of the high-sodium-ion adsorption type titanium dioxide functional powder are as follows:

[0103] (a) Pretreat poly(neopentyl glycol adipate-co-hexanediol), sulfonate polyester diol, and dimethylolpropionic acid at a temperature of 115 °C and a vacuum of 78 Pa for 1.2 h, then add them to the reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0104] (b) Add isophorone diisocyanate to the reaction kettle, heat up to 88 °C and keep the temperature for reaction for 4.2 h;

[0105] (c) Cool down to 50 °C, first add acetone to the reaction kettle until the product in the reaction kettle is completely dissolved, then add KH550-modified titanium dioxide nanopowder to the reaction kettle, heat up to 50 °C and keep the temperature for reaction for 8 h;

[0106] (d) Remove the solvent and unreacted raw materials in the reaction kettle by heating at 150 °C to obtain a solid, and pulverize the solid to obtain a high-sodium-ion adsorption type titanium dioxide functional powder with an average particle size of 80 nm;

[0107] In steps (a) to (d), the molar ratio of poly(neopentyl glycol adipate-co-hexanediol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate is 6:4:1:2; the molar amount of KH550-modified titanium dioxide nanopowder is 2 times the total molar amount of poly(neopentyl glycol adipate-co-hexanediol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate;

[0108] The preparation process of the lipophilic modified titanium dioxide functional powder is as follows: Dissolve DOPE and KH570 in an ethanol aqueous solution, then heat to 70 °C, add AIBN, keep stirring and reacting for 9 h, then cool to room temperature, add titanium dioxide nanopowder, adjust the pH value of the system to 7 with an aqueous NaOH solution, and stir and react at room temperature for 24 h. After post-treatment, a lipophilic modified titanium dioxide functional powder with an average particle size of 80 nm is obtained; among them, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.04% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder is 50% of the total mass of DOPE and KH570;

[0109] (4) Prepare a sodium ion adsorption fiber and a lipophilic cross-shaped fiber respectively;

[0110] The preparation process of the sodium ion adsorption fiber is as follows: First, melt-blend polyester with the lipophilic modified titanium dioxide functional powder to obtain masterbatch a with a concentration of 55 wt%, then carry out a solid-phase reaction on masterbatch a at 200 °C for 25 h under a nitrogen or inert gas atmosphere, and then melt-blend the solid-phase reacted masterbatch a with polyester to obtain a spinning melt a containing 15 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin the spinning melt a according to the FDY process to obtain a sodium ion adsorption fiber with a specification of 100 D / 72 F;

[0111] The preparation process of the lipophilic cross-shaped fiber is as follows: First, melt-blend polyester with the high sodium ion adsorption type titanium dioxide functional powder to obtain masterbatch b with a concentration of 60 wt%, then carry out a solid-phase reaction on masterbatch b at 200 °C for 25 h under a nitrogen or inert gas atmosphere, and then melt-blend the solid-phase reacted masterbatch b with polyester to obtain a spinning melt b containing 10 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin the spinning melt b according to the FDY process to obtain a lipophilic cross-shaped fiber with a specification of 50 D / 72 F;

[0112] During the spinning process of preparing sodium ion adsorption fibers and lipophilic cross-shaped fibers, four pairs of drafting rollers are used for drafting. 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 210 °C; 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 1200 m / min, the spinning speed of the third pair of drafting rollers is 2400 m / min, and the spinning speed of the fourth pair of drafting rollers is 2600 m / min; when preparing lipophilic cross-shaped fibers, the spinneret holes on the spinneret plate are cross-shaped;

[0113] (5)Prepare sweat-free fabric;

[0114] Spin the sodium ion adsorption fibers into an outer layer yarn with a linear density of 1.4 dtex and a connecting yarn with a linear density of 1.4 dtex, spin the lipophilic cross-shaped fibers and cotton fibers with a mass ratio of 10:5 together into an inner layer yarn with a linear density of 1 dtex, weave them into a fabric by weaving, and perform alkali etching treatment on the fabric (place the fabric in an alkali solution at a mass-to-volume ratio of 1 g:50 mL, heat it to 130 °C at a heating rate of 2 °C / min, keep it warm for 40 min, and then perform post-treatment), then the sweat-free fabric is obtained.

[0115] The water absorption rate of the finally prepared sweat-free fabric is 165%, the water droplet diffusion time is 1.3 s, the wicking height is 133 mm, the drying rate is 0.5 g / h, and the glossiness is 98%.

[0116] Comparative Example 1

[0117] A method for preparing a fabric, which is only different from Example 2 in that: in step (d), when crushing the solid, the process parameters are adjusted so that the average particle size of the high sodium ion adsorption type titanium dioxide functional powder is 50 nm.

[0118] The water absorption rate of the finally prepared fabric is 136%, the water droplet diffusion time is 2.5 s, the wicking height is 99 mm, the drying rate is 0.28 g / h, and the glossiness is 87%.

[0119] Compared with Example 2, the moisture absorption and sweat discharge performance, quick-drying performance and sweat-free effect of the fabric in Comparative Example 1 are significantly worse. This is because the average particle size of the high sodium ion adsorption type titanium dioxide functional powder is too low, resulting in difficulty in forming a sufficient number of dense convex dot matrix structures on the fiber surface, thus causing the following problems:

[0120] ① It is difficult to promote the rapid conduction and spreading of liquid on the surface of a single fiber by capillary action, which in turn affects the moisture conduction performance of the fiber and results in poor moisture absorption and sweat discharge performance of the fabric;

[0121] ② It is difficult to form a large number of capillary-like channels between monofilaments, which is not conducive to the annular radial conduction of liquid along the X, Y, and Z directions of the fabric, resulting in a decrease in conduction efficiency and spreading area, and the quick-drying property also deteriorates.

[0122] ③ There is insufficient high-sodium-ion-adsorbing titanium dioxide functional powder on the surface of the outer yarn and the connecting yarn, making it difficult to fully play its role in capturing sodium ions in water and fixing salts. Moreover, its optical effect of reducing light transmission and enhancing the contact area between light and fibers as a matting agent also weakens, and most light cannot be diffusely reflected on the fabric surface, resulting in more obvious traces of sweat formed on the fabric surface. Therefore, the sweat-free stain effect of the fabric deteriorates.

[0123] Example 3

[0124] A preparation method of a sweat-free stain fabric is as follows:

[0125] (1) Preparation of raw materials;

[0126] KH550;

[0127] Titanium dioxide nanopowder: average particle size is 220nm;

[0128] Polyhexamethylene adipate neopentyl glycol ester: CAS number is 25214-14-6;

[0129] Sulfonate polyester diol: manufacturer is Beijing Baiyuan Chemical Co., Ltd., brand is BY-3305;

[0130] Dimethylolpropionic acid;

[0131] Isophorone diisocyanate;

[0132] Acetone;

[0133] DOPE;

[0134] KH570;

[0135] Ethanol aqueous solution: composed of ethanol and water with a volume ratio of 1:6;

[0136] AIBN;

[0137] NaOH aqueous solution: concentration is 0.1mol / L;

[0138] Polyester: manufacturer is Sinopec Yizheng Chemical Fiber Co., Ltd., brand is TFW100;

[0139] Cotton fiber;

[0140] Alkali solution: composed of NaOH, benzyl alcohol and water, the concentration of NaOH is 6g / L, and the concentration of benzyl alcohol is 3mL / L;

[0141] (2) Prepare KH550-modified titanium dioxide nanopowder;

[0142] Add KH550 and titanium dioxide nanopowder into a high-speed mixer with a rotation speed of 3000 r / min, react at 100 °C for 2 h to obtain KH550-modified titanium dioxide nanopowder; wherein, the mass of KH550 is 3.5% of the mass of titanium dioxide nanopowder.

[0143] (3) Prepare high-sodium-ion-adsorbing titanium dioxide functional powder and lipophilic-modified titanium dioxide functional powder respectively;

[0144] The preparation steps of the high-sodium-ion-adsorbing titanium dioxide functional powder are as follows:

[0145] (a) Pretreat poly(neopentyl glycol adipate-co-hexanediol adipate), sulfonate polyester diol, and dimethylolpropionic acid at 120 °C and a vacuum of 70 Pa for 1.5 h, then add them into a reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0146] (b) Add isophorone diisocyanate into the reaction kettle, heat up to 90 °C and keep the temperature for reaction for 4 h;

[0147] (c) Cool down to 50 °C, first add acetone into the reaction kettle until the product in the kettle is completely dissolved, then add KH550-modified titanium dioxide nanopowder into the reaction kettle, heat up to 60 °C and keep the temperature for reaction for 6 h;

[0148] (d) Remove the solvent and unreacted raw materials in the reaction kettle by heating at 150 °C to obtain a solid, pulverize the solid to obtain high-sodium-ion-adsorbing titanium dioxide functional powder with an average particle size of 250 nm;

[0149] In steps (a) to (d), the molar ratio of poly(neopentyl glycol adipate-co-hexanediol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate is 10:9:3:3; the molar amount of KH550-modified titanium dioxide nanopowder is 3 times the total molar amount of poly(neopentyl glycol adipate-co-hexanediol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate;

[0150] The preparation process of the lipophilic modified titanium dioxide functional powder is as follows: Dissolve DOPE and KH570 in an ethanol aqueous solution, heat up to 80 °C, then add AIBN, keep the temperature and stir for reaction for 6 h, cool down to room temperature, add titanium dioxide nanopowder, adjust the pH value of the system to 8 with an NaOH aqueous solution, and stir for reaction at room temperature for 23 h. After post-treatment, a lipophilic modified titanium dioxide functional powder with an average particle size of 250 nm is obtained; among them, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.04% of the total mass of DOPE and KH570, and the mass of the titanium dioxide nanopowder is 60% of the total mass of DOPE and KH570;

[0151] (4)Prepare sodium ion adsorption fibers and lipophilic cross-shaped fibers respectively;

[0152] The preparation process of the sodium ion adsorption fiber is as follows: First, melt-blend polyester with the lipophilic modified titanium dioxide functional powder to obtain masterbatch a with a concentration of 50 wt%, then carry out solid-phase reaction on masterbatch a at 190 °C for 20 h under a nitrogen or inert gas atmosphere, and then melt-blend the solid-phase reacted masterbatch a with polyester to obtain spinning melt a containing 8 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin spinning melt a according to the FDY process to obtain sodium ion adsorption fibers with a specification of 90D / 72F;

[0153] The preparation process of the lipophilic cross-shaped fiber is as follows: First, melt-blend polyester with the high sodium ion adsorption type titanium dioxide functional powder to obtain masterbatch b with a concentration of 50 wt%, then carry out solid-phase reaction on masterbatch b at 190 °C for 20 h under a nitrogen or inert gas atmosphere, and then melt-blend the solid-phase reacted masterbatch b with polyester to obtain spinning melt b containing 15 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, directly spin spinning melt b according to the FDY process to obtain lipophilic cross-shaped fibers with a specification of 50D / 48F;

[0154] During the spinning process of preparing the sodium ion adsorption fibers and the lipophilic cross-shaped fibers, four pairs of drafting rollers are used for drafting. 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 430 m / min, the spinning speed of the second pair of drafting rollers is 1300 m / min, the spinning speed of the third pair of drafting rollers is 2500 m / min, and the spinning speed of the fourth pair of drafting rollers is 2800 m / min; when preparing the lipophilic cross-shaped fibers, the spinneret holes on the spinneret plate are cross-shaped;

[0155] (5)Prepare sweat-free stain-free fabric;

[0156] The sodium ion adsorption fibers are spun into an outer yarn with a linear density of 1.3 dtex and a connecting yarn with a linear density of 1.3 dtex. The lipophilic cross-shaped fibers and cotton fibers with a mass ratio of 10:2 are spun together into an inner yarn with a linear density of 1.2 dtex, and then woven into a fabric by weaving. The fabric is subjected to alkali etching treatment (the fabric is placed in an alkali solution at a mass-volume ratio of 1 g:50 mL, heated to 130 °C at a heating rate of 2 °C / min, kept warm for 40 min, and then post-treated), and the sweat-free stain fabric is obtained.

[0157] The finally obtained sweat-free stain fabric has a water absorption rate of 169%, a water droplet diffusion time of 1 s, a wicking height of 139 mm, a drying rate of 0.52 g / h, and a glossiness of 99%.

[0158] Comparative Example 2

[0159] A method for preparing a fabric, which is only different from Example 3 in that: in step (4), during the preparation of the sodium ion adsorption fibers, after the solid-phase reaction of masterbatch a, the addition amount of polyester is adjusted so that the content of the high sodium ion adsorption type titanium dioxide functional powder in the spinning melt a is 6 wt%.

[0160] The finally obtained fabric has a water absorption rate of 111%, a water droplet diffusion time of 3.2 s, a wicking height of 81 mm, a drying rate of 0.22 g / h, and a glossiness of 65%.

[0161] Compared with Example 3, the moisture absorption and sweat release performance, quick-drying performance and sweat-free stain effect of the fabric in Comparative Example 2 are significantly worse. This is because the content of the high sodium ion adsorption type titanium dioxide functional powder in the spinning melt a is too low, resulting in a decrease in the number of convex dot matrix structures formed on the fiber surface and insufficient density of distribution, leading to deterioration of the moisture absorption and sweat release performance, quick-drying performance and sweat-free stain effect of the fabric.

[0162] Example 4

[0163] A method for preparing a sweat-free stain fabric, the specific steps are as follows:

[0164] (1) Preparation of raw materials;

[0165] KH550;

[0166] Titanium dioxide nanopowder: The average particle size is 280 nm;

[0167] Polyhexamethylene adipate neopentyl glycol ester: The CAS number is 25214-14-6;

[0168] Sulfonate polyester diol: The manufacturer is Beijing Baiyuan Chemical Co., Ltd., and the brand is BY-3305;

[0169] Dimethylolpropionic acid;

[0170] Isophorone diisocyanate;

[0171] Acetone;

[0172] DOPE;

[0173] KH570;

[0174] Ethanol aqueous solution: composed of ethanol and water with a volume ratio of 1:7;

[0175] AIBN;

[0176] NaOH aqueous solution: with a concentration of 0.1 mol / L;

[0177] Polyester: manufactured by Sinopec Yizheng Chemical Fiber Co., Ltd., with the grade of SD-A;

[0178] Cotton fiber;

[0179] Alkali solution: composed of NaOH, benzyl alcohol and water, with the concentration of NaOH being 6 g / L and the concentration of benzyl alcohol being 3 mL / L;

[0180] (2) Preparation of KH550-modified titanium dioxide nanopowder;

[0181] Add KH550 and titanium dioxide nanopowder into a high-speed blender with a rotation speed of 2500 r / min, react at 90 °C for 3 h to obtain KH550-modified titanium dioxide nanopowder; among them, the mass of KH550 is 4.5% of the mass of titanium dioxide nanopowder;

[0182] (3) Prepare high-sodium-ion adsorption type titanium dioxide functional powder and lipophilic modified titanium dioxide functional powder respectively;

[0183] The preparation steps of the high-sodium-ion adsorption type titanium dioxide functional powder are as follows:

[0184] (a) Pre-treat polyhexamethylene adipate neopentyl glycol ester, sulfonate polyester diol and dimethylolpropionic acid at a temperature of 118 °C and a vacuum degree of 72 Pa for 2 h, then add them into the reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0185] (b) Add isophorone diisocyanate into the reaction kettle, heat up to 80 °C and keep the temperature for reaction for 6 h;

[0186] (c) Cool down to 50 °C, first add acetone into the reaction kettle until the product in the kettle is completely dissolved, then add KH550-modified titanium dioxide nanopowder into the reaction kettle, heat up to 55 °C and keep the temperature for reaction for 7 h;

[0187] (d) The solvent and unreacted raw materials in the reaction kettle were removed by heating at 130 °C to obtain a solid, and the solid was pulverized to obtain a high sodium ion adsorption type titanium dioxide functional powder with an average particle size of 300 nm;

[0188] In steps (a) to (d), the molar ratio of poly (neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate was 6:9:3:2; the molar amount of KH550-modified titanium dioxide nanopowder was 3 times the total molar amount of poly (neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate;

[0189] The preparation process of the lipophilic modified titanium dioxide functional powder was as follows: DOPE and KH570 were dissolved in an ethanol aqueous solution, and then the temperature was raised to 60 °C. Then AIBN was added, and after holding and stirring for 10 h, the temperature was lowered to room temperature, and titanium dioxide nanopowder was added. The pH value of the system was adjusted to 8 with an aqueous NaOH solution, and then stirred at room temperature for 20 h. After post-treatment, a lipophilic modified titanium dioxide functional powder with an average particle size of 300 nm was obtained; among them, the molar ratio of DOPE to KH570 was 1:1, the mass of AIBN was 0.03% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder was 58% of the total mass of DOPE and KH570;

[0190] (4) Sodium ion adsorption fibers and lipophilic cross-shaped fibers were prepared respectively;

[0191] The preparation process of the sodium ion adsorption fiber was as follows: First, polyester and the lipophilic modified titanium dioxide functional powder were melt-blended to obtain masterbatch a with a concentration of 65 wt%. Then, under a nitrogen or inert gas atmosphere, masterbatch a was subjected to a solid-phase reaction at 210 °C for 22 h. Then, the solid-phase reaction product of masterbatch a and polyester were melt-blended to obtain a spinning melt a containing 10 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, the spinning melt a was directly spun according to the FDY process to obtain sodium ion adsorption fibers with a specification of 80D / 48F;

[0192] The preparation process of the lipophilic cross-shaped fiber was as follows: First, polyester and the high sodium ion adsorption type titanium dioxide functional powder were melt-blended to obtain masterbatch b with a concentration of 55 wt%. Then, under a nitrogen or inert gas atmosphere, masterbatch b was subjected to a solid-phase reaction at 205 °C for 22 h. Then, the solid-phase reaction product of masterbatch b and polyester were melt-blended to obtain a spinning melt b containing 8 wt% of the high sodium ion adsorption type titanium dioxide functional powder. Then, the spinning melt b was directly spun according to the FDY process to obtain lipophilic cross-shaped fibers with a specification of 30D / 36F;

[0193] During the spinning process of preparing sodium ion adsorption fibers and lipophilic cross-shaped fibers, four pairs of drafting rollers are used for drafting. 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 450 m / min, the spinning speed of the second pair of drafting rollers is 1200 m / min, the spinning speed of the third pair of drafting rollers is 2400 m / min, and the spinning speed of the fourth pair of drafting rollers is 2650 m / min; when preparing lipophilic cross-shaped fibers, the spinneret holes on the spinneret plate are cross-shaped;

[0194] (5)Prepare sweat-free fabric;

[0195] Spin the sodium ion adsorption fibers into an outer layer yarn with a linear density of 1.6 dtex and a connecting yarn with a linear density of 1.6 dtex, spin the lipophilic cross-shaped fibers and cotton fibers with a mass ratio of 10:2.5 together into an inner layer yarn with a linear density of 1 dtex, weave them into fabric by weaving, and perform alkali etching treatment on the fabric (place the fabric in an alkali solution at a mass-to-volume ratio of 1 g:50 mL, heat it to 130 °C at a heating rate of 2 °C / min, keep it warm for 40 min, and then perform post-treatment), then the sweat-free fabric is obtained.

[0196] The finally obtained sweat-free fabric has a water absorption rate of 158%, a water droplet diffusion time of 1.5 s, a wicking height of 119 mm, a drying rate of 0.47 g / h, and a glossiness of 96%.

[0197] Example 5

[0198] A preparation method of sweat-free fabric, the specific steps are as follows:

[0199] (1)Preparation of raw materials;

[0200] KH550;

[0201] Titanium dioxide nano powder: average particle size is 300 nm;

[0202] Polyhexamethylene adipate neopentyl glycol ester: CAS number is 25214-14-6;

[0203] Sulfonate polyester diol: manufacturer is Beijing Boyuan Chemical Co., Ltd., brand is BY-3305;

[0204] Dimethylolpropionic acid;

[0205] Isophorone diisocyanate;

[0206] Acetone;

[0207] DOPE;

[0208] KH570;

[0209] Ethanol aqueous solution: composed of ethanol and water with a volume ratio of 1:8;

[0210] AIBN;

[0211] NaOH aqueous solution: with a concentration of 0.1 mol / L;

[0212] Polyester: manufactured by Sinopec Yizheng Chemical Fiber Co., Ltd., with the brand number SD-A;

[0213] Cotton fiber;

[0214] Alkali solution: composed of NaOH, benzyl alcohol and water, with the concentration of NaOH being 6 g / L and the concentration of benzyl alcohol being 3 mL / L;

[0215] (2) Prepare KH550-modified titanium dioxide nanopowder;

[0216] Add KH550 and titanium dioxide nanopowder into a high-speed blender with a rotation speed of 2800 r / min, react at 85 °C for 2.5 h to obtain KH550-modified titanium dioxide nanopowder; among them, the mass of KH550 is 4% of the mass of titanium dioxide nanopowder;

[0217] (3) Prepare high-sodium-ion-adsorbing titanium dioxide functional powder and lipophilic-modified titanium dioxide functional powder respectively;

[0218] The preparation steps of the high-sodium-ion-adsorbing titanium dioxide functional powder are as follows:

[0219] (a) Pretreat poly(neopentyl glycol adipate-co-hexanediol), sulfonate polyester diol, and dimethylolpropionic acid at a temperature of 113 °C and a vacuum of 75 Pa for 1.5 h, then add them into a reaction kettle, fill with nitrogen or inert gas for protection, stir and heat up to 60 °C;

[0220] (b) Add isophorone diisocyanate into the reaction kettle, heat up to 82 °C and keep the temperature for reaction for 5.5 h;

[0221] (c) Cool down to 50 °C, first add acetone into the reaction kettle until the product in the reaction kettle is completely dissolved, then add KH550-modified titanium dioxide nanopowder into the reaction kettle, heat up to 60 °C and keep the temperature for reaction for 8 h;

[0222] (d) Remove the solvent and unreacted raw materials in the reaction kettle by heating at 140 °C to obtain a solid, pulverize the solid to obtain a high-sodium-ion-adsorbing titanium dioxide functional powder with an average particle size of 350 nm;

[0223] In steps (a) to (d), the molar ratio of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate is 10:8:2:2.5; the molar amount of KH550-modified titanium dioxide nanopowder is 2.5 times the total molar amount of poly(neopentyl glycol adipate), sulfonate polyether diol, dimethylolpropionic acid, and isophorone diisocyanate;

[0224] The preparation process of the lipophilic-modified titanium dioxide functional powder is as follows: Dissolve DOPE and KH570 in an ethanol aqueous solution, then raise the temperature to 75 °C, add AIBN, keep stirring and reacting for 7 h, then cool down to room temperature and add titanium dioxide nanopowder. After adjusting the pH value of the system to 7.5 with an aqueous NaOH solution, stir and react at room temperature for 20 h, and after post-treatment, a lipophilic-modified titanium dioxide functional powder with an average particle size of 350 nm is obtained; among them, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.05% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder is 52% of the total mass of DOPE and KH570;

[0225] (4) Prepare sodium ion adsorption fibers and lipophilic cross-shaped fibers respectively;

[0226] The preparation process of the sodium ion adsorption fiber is as follows: First, melt-blend polyester with the lipophilic-modified titanium dioxide functional powder to obtain masterbatch a with a concentration of 58 wt%, then under a nitrogen or inert gas atmosphere, carry out a solid-phase reaction on masterbatch a at 195 °C for 30 h, and then melt-blend the solid-phase reaction product of masterbatch a with polyester to obtain a spinning melt a containing 8 wt% of the high sodium ion adsorption type titanium dioxide functional powder, and then directly spin the spinning melt a according to the FDY process to obtain sodium ion adsorption fibers with a specification of 100D / 72F;

[0227] The preparation process of the lipophilic cross-shaped fiber is as follows: First, melt-blend polyester with the high sodium ion adsorption type titanium dioxide functional powder to obtain masterbatch b with a concentration of 65 wt%, then under a nitrogen or inert gas atmosphere, carry out a solid-phase reaction on masterbatch b at 195 °C for 30 h, and then melt-blend the solid-phase reaction product of masterbatch b with polyester to obtain a spinning melt b containing 10 wt% of the high sodium ion adsorption type titanium dioxide functional powder, and then directly spin the spinning melt b according to the FDY process to obtain lipophilic cross-shaped fibers with a specification of 50D / 48F;

[0228] During the spinning process of preparing sodium ion adsorption fibers and lipophilic cross-shaped fibers, four pairs of drafting rollers are used for drafting. 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 500 m / min, the spinning speed of the second pair of drafting rollers is 1500 m / min, the spinning speed of the third pair of drafting rollers is 2600 m / min, and the spinning speed of the fourth pair of drafting rollers is 2800 m / min; when preparing lipophilic cross-shaped fibers, the spinneret holes on the spinneret plate are cross-shaped;

[0229] (5)Prepare sweat-free fabric;

[0230] Spin the sodium ion adsorption fibers into an outer layer yarn with a linear density of 1.4 dtex and a connecting yarn with a linear density of 1.4 dtex, spin the lipophilic cross-shaped fibers and cotton fibers with a mass ratio of 10:1 together into an inner layer yarn with a linear density of 1.1 dtex, weave them into fabric by weaving, and perform alkali etching treatment on the fabric (place the fabric in an alkali solution at a mass-to-volume ratio of 1 g:50 mL, heat it to 130°C at a heating rate of 2°C / min, keep it warm for 40 min, and then perform post-treatment), then the sweat-free fabric is obtained.

[0231] The water absorption rate of the finally obtained sweat-free fabric is 160%, the water droplet diffusion time is 1.6 s, the wicking height is 121 mm, the drying rate is 0.47 g / h, and the glossiness is 98%.

[0232] Comparative Example 3

[0233] A method for preparing a fabric, which is only different from Example 5 in that: in step (4), during the spinning process of preparing sodium ion adsorption fibers, the spinning speed of the fourth pair of drafting rollers is 2600 m / min.

[0234] The water absorption rate of the finally obtained fabric is 113%, the water droplet diffusion time is 3.5 s, the wicking height is 78 mm, the drying rate is 0.2 g / h, and the glossiness is 62%.

[0235] Compared with Example 5, the moisture absorption and sweat discharge performance, quick-drying performance and sweat-free effect of the fabric in Comparative Example 3 are significantly worse. This is because during the spinning process of preparing sodium ion adsorption fibers, the drafting is insufficient, resulting in a decrease in the number of convex dot matrix structures formed on the fiber surface and less dense distribution, leading to a deterioration of the moisture absorption and sweat discharge performance, quick-drying performance and sweat-free effect of the fabric.

Claims

1. A method for preparing a sweat-free fabric, characterized in that: Sodium ion adsorbing fibers and lipophilic cross-shaped fibers are prepared respectively, the sodium ion adsorbing fibers are spun into outer yarns and connecting yarns, the lipophilic cross-shaped fibers and cotton fibers are spun together into inner yarns, the fabrics are woven into cloths by shuttle weaving, and the cloths are alkali-etched to obtain sweat-stain-free fabrics; The preparation process of the sodium ion adsorbing fiber or the lipophilic cross-shaped fiber is as follows: firstly, polyester and modified functional particles with an average particle size of 80-350 nm are melt-blended to obtain a masterbatch, then the masterbatch is solid-phase reacted, and then the masterbatch after the solid-phase reaction is melt-blended with polyester to obtain a spinning melt containing 8-15wt% of the modified functional particles, and then the spinning melt is spun, and a draft of 5.5-6.5 times is performed during the spinning process; The modified functional particles corresponding to the sodium ion adsorption fiber are high sodium ion adsorption type titanium dioxide functional powders, and the preparation process is as follows: after pre-treating poly(hexanediol adipate neopentyl glycol), sulfonate polyester diol, and dimethylol propionic acid, they are reacted with isophorone diisocyanate and KH550 modified titanium dioxide nanopowder in sequence, and after post-treatment, high sodium ion adsorption type titanium dioxide functional powders are obtained; The modified functional particles corresponding to the lipophilic cross-shaped fibers are lipophilic modified titanium dioxide functional powders, i.e. titanium dioxide functional powders with DOPE coated on the surface; When preparing lipophilic cross-shaped fibers, the spinneret holes on the spinneret are cross-shaped.

2. The method for preparing a sweat-free fabric according to claim 1, characterized in that: The concentration of the masterbatch is 50-65wt%, and the solid phase reaction is carried out under nitrogen or inert gas atmosphere at a temperature of 190-210°C for 20-30h.

3. The method for preparing a sweat-free fabric according to claim 1, characterized in that: Spinning is carried out directly according to the FDY process.

4. The method for preparing a sweat-free fabric according to claim 1, characterized in that: Four pairs of drafting rollers are used for stretching; the temperature of the first pair of drafting rollers is 100-120°C, the temperature of the second pair of drafting rollers is 130-150°C, the temperature of the third pair of drafting rollers is 180-200°C, and the temperature of the fourth pair of drafting rollers is 200-240°C; 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.

5. The method for preparing a sweat-free fabric according to claim 1, characterized in that: In the preparation process of high sodium ion adsorption type titanium dioxide functional powder, the molar ratio of poly(hexanediol adipate neopentyl glycol), sulfonate polyether diol, dimethylol propionic acid and isophorone diisocyanate is 6-10:4-9:1-3:2-3; the molar amount of KH550 modified titanium dioxide nanopowder is 2-3 times the total molar amount of poly(hexanediol adipate neopentyl glycol), sulfonate polyether diol, dimethylol propionic acid and isophorone diisocyanate.

6. The method for preparing a sweat-free fabric according to claim 5, characterized in that: The preparation steps of high sodium ion adsorption type titanium dioxide functional powder are as follows: (a) pre-treating poly(hexanediol adipate) neopentyl glycol, sulfonate polyester diol and dimethylol propionic acid at a temperature of 110-120°C and a vacuum degree of less than 80 Pa for 1-2 hours, adding them into a reaction kettle, filling with nitrogen or inert gas for protection, stirring and heating to 60°C; (b) adding isophorone diisocyanate into the reaction kettle, heating to 80-90°C and then keeping the temperature to react for 4-6 hours; (c) Cooling to 50°C, adding solvent to the reactor until the product in the reactor is completely dissolved, then adding KH550 modified titanium dioxide nanopowder to the reactor, heating to 50-60°C and then keeping the temperature for 6-8 hours; (d) removing the solvent and unreacted raw materials in the reaction kettle to obtain a solid, and crushing the solid to obtain a high sodium ion adsorption type titanium dioxide functional powder.

7. The method for preparing a sweat-free fabric according to claim 6, characterized in that: The preparation process of KH550 modified titanium dioxide nanopowder is as follows: KH550 and titanium dioxide nanopowder are added into a high-speed blender with a rotation speed of 2500-3000r / min, and reacted at 80-100°C for 2-3h to obtain KH550 modified titanium dioxide nanopowder, wherein the mass of KH550 is 3-5% of the mass of titanium dioxide nanopowder.

8. The method for preparing a sweat-free fabric according to claim 1, characterized in that: The preparation process of lipophilic modified titanium dioxide functional powder is as follows: after dissolving DOPE and KH570 in a solvent, heating to 60-80°C, adding AIBN, stirring and reacting for 6-10 hours at a heat preservation temperature, cooling to room temperature, adding titanium dioxide nanopowder, adjusting the pH value of the system to 7-8, stirring and reacting at room temperature for 20-24 hours, and obtaining lipophilic modified titanium dioxide functional powder after post-treatment.

9. The method for preparing a sweat-stain-free fabric according to claim 8, characterized in that: In the preparation process of lipophilic modified titanium dioxide functional powder, the molar ratio of DOPE to KH570 is 1:1, the mass of AIBN is 0.03-0.05% of the total mass of DOPE and KH570, and the mass of titanium dioxide nanopowder is 50-60% of the total mass of DOPE and KH570.

10. The method for preparing a sweat-stain-free fabric according to claim 1, characterized in that: The specifications of the sodium ion adsorbing fiber are 75-100D / 48-72F, the specifications of the lipophilic cross fiber are 20-50D / 36-72F, the linear density of the outer yarn and the connecting yarn is 1.3-1.6dtex, the mass ratio of the lipophilic cross fiber and the cotton fiber is 10:1~5, and the linear density of the inner yarn is 0.8-1.2dtex.