Preparation method of light and thin anti-permeable quick-dry fabric for swimwear

Abstract

The invention belongs to the technical field of textile, and relates to a preparation method of a light and thin anti-permeable quick-drying fabric for swimsuits, which comprises the following steps: respectively preparing a fiber A and a fiber B, spinning the fiber A into a yarn A, spinning the fiber B into a yarn B, and weaving the yarn A as an outer-layer yarn and the yarn B as an inner-layer yarn into a fabric in a tatting manner, the outer layer of the fabric is subjected to alkali etching treatment, and the light and thin anti-permeation quick-drying fabric for the swimsuit is obtained. The fiber A is formed by polyester fibers added with titanium dioxide as functional particles, the titanium dioxide is subjected to hydrophobic modification treatment, and the fiber B is formed by nylon 6 fibers added with silicon dioxide, titanium dioxide or zinc oxide as functional particles. The preparation method is simple, the fiber forming process and the weaving process are suitable for existing industrial equipment, large-scale industrial application is facilitated, and the prepared fabric has the anti-perspective, quick-dry and comfortable functions and can meet the application requirements of swimsuits.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles and relates to a preparation method of a lightweight anti-transparent and quick-drying fabric for swimsuits. Background Art

[0002] With the continuous improvement of living standards, people's requirements for clothing fabrics are also constantly increasing. Now when people swim, they usually need to wear swimsuits. Modern swimsuits are generally made of textiles that do not sag or bulge when wet.

[0003] For fabrics used in swimsuits, anti-transparency, quick-drying, and comfort are the most basic requirements, and among them, the most important is the anti-transparency ability. If the light transmittance of the swimsuit is too high, since the swimsuit fits the body, it is easy to cause embarrassment when the light transmittance is too high; if the function of moisture absorption and breathability is lacking in the actual application process and quick-drying cannot be achieved, it will also cause the sweat stains released by the swimmer during the warm-up process to not be processed in time, and then it is easy for the sweat stains to accumulate inside the swimsuit, causing discomfort to the swimmer and reducing the wearing experience and comfort of the fabric. Therefore, it is of great significance to study how to make the fabric for swimsuits meet the requirements of anti-transparency, quick-drying, and comfort.

[0004] The fabrics for swimsuits in the prior art usually adopt a multi-layer fabric structure of 3 to 5 layers, add a fabric with a darker color as the anti-transparent layer, or print various patterns and colors on the fabric surface through printing to achieve the purpose of anti-transparency; add a quick-drying layer to achieve the purpose of quick-drying, and the fabric of the quick-drying layer is mainly the existing special-shaped fibers; in addition, a waterproof layer will also be introduced into the swimsuit fabric; in order to meet the requirements, the same functional layer is often selected for multi-layer stacking and use.

[0005] For example, Patent CN217993708U discloses a fabric for a swimsuit with a low light transmittance, and Patent CN213261435U discloses a fabric for swimming with anti-transparency. Both of them add an anti-transparent layer (such as color adhesive tape, black polyester fabric, anti-transparent DTY fiber) in the middle of the fabric to reduce the light transmittance of the swimsuit and improve the anti-transparency performance.

[0006] Another example is that Patent CN217851441U discloses a moisture-conducting and breathable swimsuit, and Patent CN220777465U discloses a quick-drying swimsuit. Both of them add a quick-drying layer in the middle of the fabric to improve the quick-drying performance.

[0007] For another example, Patent CN217993708U discloses a fabric for low light transmittance swimsuits, which consists of a skin-friendly layer, an antibacterial layer, a sunscreen layer, a waterproof layer, etc.; Patent CN220777465U discloses a quick-drying swimsuit, which consists of a skin-friendly layer, an antibacterial layer, a waterproof layer, lime and a wear-resistant layer; Patent CN213261435U discloses a fabric for preventing see-through during swimming, which consists of a breathable cotton layer, a silica gel coating layer, a metal wire, a see-through prevention layer and a waterproof layer; all these three technical solutions add a skin-friendly layer or a breathable cotton layer to the fabric to improve the comfort performance.

[0008] However, the more layers there are in this multi-layer structure, the thicker the fabric will be. When swimming and after leaving the water, more water adheres to the swimsuit, resulting in an obvious sense of weight. This not only affects the comfort performance of the swimsuit but also makes it difficult to achieve the quick-drying effect.

[0009] Therefore, it is necessary to develop a new lightweight, see-through-proof and quick-drying fabric for swimsuits to meet the requirements of swimwear fabrics for anti-see-through, quick-drying and comfort. Summary of the Invention

[0010] The purpose of the present invention is to solve the problems existing in the prior art and provide a preparation method for a lightweight, see-through-proof and quick-drying fabric for swimsuits.

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

[0012] A preparation method for a lightweight, see-through-proof and quick-drying fabric for swimsuits, which respectively prepares fiber A and fiber B, spins fiber A into yarn A, spins fiber B into yarn B, takes yarn A as the outer layer yarn and at the same time takes yarn B as the inner layer yarn to weave into a fabric by the method of shuttle weaving, and performs alkali etching treatment on the outer layer of the fabric to obtain the lightweight, see-through-proof and quick-drying fabric for swimsuits;

[0013] The preparation processes of fiber A and fiber B are as follows: Spinning a spinning melt containing 8-15wt% of coated modified functional particles, and performing a draw ratio of 5.6-6.5 times during the spinning process; the D50 particle size (i.e., the median diameter or the median particle size) of the coated modified functional particles is 50-300nm; the coated modified functional particles include functional particles and oligomers coated on their surfaces by covalent bonds, and the oligomers and the matrix of the spinning melt only have different average degrees of polymerization, and the average degree of polymerization of the oligomers is 40-60; controlling the particle size of the coated modified functional particles, the content of the coated modified functional particles in the spinning melt, and the draw ratio can form a large number of protrusions on the surfaces of fiber A and fiber B;

[0014] The preparation method of the coated modified functional particles is as follows: First, perform organic modification on the functional particles with a coupling agent to obtain coupling agent-modified functional particles, and at the same time prepare oligomers, and then mix and react the oligomers with the coupling agent-modified functional particles;

[0015] The functional particles corresponding to Fiber A are titanium dioxide, the coupling agent is a mixture of a fluorine-free silane and a fluorinated silane, and the matrix of the spinning melt is polyester; the functional particles corresponding to Fiber B are silica, titanium dioxide or zinc oxide, and the matrix of the spinning melt is nylon 6;

[0016] The preparation process of the spinning melt corresponding to Fiber A is as follows: First, polyester and coated and modified functional particles are melt-blended to obtain masterbatch, then the masterbatch is subjected to solid-phase viscosity increase, and then the masterbatch after solid-phase viscosity increase is melt-blended with polyester to obtain the spinning melt. During the solid-phase viscosity increase process, the oligomer coated on the surface of titanium dioxide reacts with polyester, improving the binding fastness between titanium dioxide and the fiber body in the subsequently prepared Fiber A, and avoiding the shedding of titanium dioxide during the alkali etching treatment process;

[0017] The alkali etching treatment of the outer layer of the fabric means: After spraying alkali solution on the outer surface of the fabric by spraying, heat treatment is carried out on it; the alkali etching treatment of the outer layer of the fabric can cause the oligomers in the coated and modified functional particles on the outer surface of the fabric to fall off, and the fluorinated silane grafted on the functional particles is exposed, forming a hydrophobic layer on the outer layer of the fabric; if Fiber A is first subjected to alkali etching treatment and then the fabric is prepared, the obtained fabric has strong hydrophobic functions on both the inner and outer sides, which will increase the potential barrier for water to diffuse from the inner layer to the outer layer, and is not conducive to the diffusion of the moisture inside the swimsuit to the outer layer. At the same time, the formation of a hydrophobic layer on the outer layer will increase the potential barrier for external water to diffuse into the interior, reducing the infiltration of water into the swimsuit during swimming and improving the wearing comfort.

[0018] The principles for the swimsuit fabric of the present invention to generate the functions of being light, anti-transparent and quick-drying are as follows: The swimsuit fabric adopts a two-layer structure, consisting of an inner skin-friendly layer and an outer anti-perspective and quick-drying layer. The inner layer is composed of nylon 6 fibers added with functional particles of silica, titanium dioxide or zinc oxide, and the outer layer is composed of polyester fibers added with functional particles of titanium dioxide. The surfaces of the nylon 6 fibers and polyester fibers of the present invention have a large number of protrusions. This fiber surface structure has the following four advantages: (1) A large number of grooves are formed between the protrusions on the surface of the same fiber, which is conducive to the rapid spreading of water on the fiber surface. A large number of capillary-like channels are formed between the protrusions of different fibers, which is conducive to the rapid conduction of water, realizing the quick-drying function; (2) The fiber surface has functional particles, which have a scattering effect on light, and the anti-transparent function can be generated without multiple layers being stacked, which can reduce the number of layers and thickness of the swimsuit fabric, making the wearer more comfortable; (3) Due to the presence of functional particles, the swimsuit fabric has a strong scattering effect on ultraviolet rays and has a sunscreen effect; (4) The grooves between the protrusions on the surface of the same fiber are conducive to the attachment of dyeing particles, making the fabric have good dyeability and a variety of colors, better meeting the needs of consumers for the colors of swimsuits.

[0019] As a preferred technical solution:

[0020] A preparation method of a lightweight anti-permeability and quick-drying fabric for swimsuits as described above. Among the coupling agents corresponding to fiber A, the mass ratio of the non-fluorinated silane to the fluorinated silane is 1:1 to 5. The non-fluorinated silane is γ-aminopropyltriethoxysilane, and the fluorinated silane is tridecafluorooctyltrimethoxysilane or perfluorodecyltrimethoxysilane; the coupling agent corresponding to fiber B is one or more of γ-aminopropyltriethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimeth(eth)oxysilane, n-octyltriethoxysilane, vinyltriethoxysilane, isopropyltriisostearoyl titanate, isopropoxytris(dioctylpyrophosphato)titanate, tridecafluorooctyltrimethoxysilane, and perfluorodecyltrimethoxysilane.

[0021] A preparation method of a lightweight anti-permeability and quick-drying fabric for swimsuits as described above. The mass of the coupling agent is 3 to 5% of the mass of the functional particles; the organic modification is completed in a high-speed blender at a rotation speed of 2500 to 3000 r / min, a temperature of 80 to 100 °C, and a time of 2 to 3 h.

[0022] A preparation method of a lightweight anti-permeability and quick-drying fabric for swimsuits as described above. The preparation steps of the coated and modified functional particles corresponding to fiber A are as follows:

[0023] (a) Organic modification of the functional particles with a coupling agent to obtain coupling agent-modified functional particles;

[0024] (b) Add dibasic acid and diol to the reaction kettle, stir and heat up to 200 to 230 °C, control the pressure of the reaction system to be 0.2 to 0.3 MPa, react for 3 to 5 h, then add a catalyst, control the reaction system to gradually heat up to 260 to 270 °C, evacuate to a vacuum degree lower than 80 Pa, react for 2 to 3 h, and then cool down to 230 °C to obtain an oligomer;

[0025] The dibasic acid is terephthalic acid; the diol is one or more of ethylene glycol, propylene glycol, and butanediol; the catalyst is antimony glycolate or tetrabutyl titanate; the molar ratio of the dibasic acid to the diol is 1:0.9 to 0.95; the mass of the catalyst is 0.01 to 0.1% of the mass of the dibasic acid;

[0026] (c) Add the coupling agent-modified functional particles to the reaction system in step (b), stir at high speed to make them fully mixed, keep the reaction at a constant temperature for 0.5 to 1 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain the coated and modified functional particles;

[0027] The mass ratio of the coupling agent-modified functional particles to the oligomer is 5 to 8:1;

[0028] The preparation steps of the coated and modified functional particles corresponding to Fiber B are as follows:

[0029] (Ⅰ)Organically modify the functional particles with a coupling agent to obtain coupling agent-modified functional particles;

[0030] (Ⅱ)Add dibasic acid, diamine, and deionized water to the reaction kettle. After displacing the air in the reaction kettle with nitrogen or inert gas (i.e., introducing nitrogen or inert gas at 0.3 - 0.6 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), react at 250 °C and 1.3 - 1.8 MPa for 3 h, then reduce the pressure to 0.1 MPa, add a catalyst, raise the temperature to 260 °C, and turn on the vacuum pump to maintain the vacuum degree below 80 Pa. React for 2 - 3 h, then fill with nitrogen or inert gas to raise the pressure to 0.1 MPa, and cool down to 220 °C to obtain an oligomer;

[0031] The dibasic acid is one or more of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid; the diamine is one or more of pentanediamine and ethylenediamine; the catalyst is tetrabutyl titanate; the molar ratio of dibasic acid to diamine is 1:0.9 - 0.95; the molar ratio of deionized water to dibasic acid is 0.3 - 0.4:1; the mass of the catalyst is 0.01 - 0.1% of the mass of the dibasic acid;

[0032] (Ⅲ)Add the coupling agent-modified functional particles to the reaction system in step (Ⅱ), stir at high speed to make it fully mixed, keep the temperature for reaction for 0.5 - 1 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain the coated and modified functional particles;

[0033] The mass ratio of the coupling agent-modified functional particles to the oligomer is 5 - 8:1.

[0034] In the preparation process of the spinning melt corresponding to Fiber A in the preparation method of a lightweight anti-transparent and quick-drying fabric for swimsuits as described above, the concentration of the masterbatch is 50 - 65 wt%, solid-phase viscosity increase is carried out under a nitrogen or inert gas atmosphere, the temperature is 190 - 210 °C, and the time is 20 - 30 h;

[0035] The preparation process of the spinning melt corresponding to Fiber B is as follows: First, melt-blend nylon 6 with the coated and modified functional particles to obtain a masterbatch with a concentration of 50 - 65 wt%, and then melt-blend the masterbatch with nylon 6 to obtain the spinning melt;

[0036] The drafting uses four pairs of drafting rollers; 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;

[0037] The spinning is directly carried out according to the FDY process.

[0038] For the preparation method of a lightweight anti - transparent and quick - drying fabric for swimsuits as described above, the specification of fiber A is 75 - 100 D / 48 - 72 F, the specification of fiber B is 20 - 50 D / 36 - 72 F. Fiber B is a fine - denier fiber, which is beneficial to improving the comfort of the fabric. At the same time, because fiber B has a rough convex surface structure, the contact between fiber B and the skin is reduced, and the viscosity of the swimsuit to the skin can be reduced during swimming. Although fiber B has a rough surface structure, the functional particles forming these rough structures are all coated by a resin soft shell, which will not increase the abrasion of the swimsuit to the skin during swimming. The linear density of yarn A is 1.3 - 1.6 dtex, and the linear density of yarn B is 0.6 - 1.0 dtex.

[0039] For the preparation method of a lightweight anti - transparent and quick - drying fabric for swimsuits as described above, yarn A is woven by a high - density twill weaving method, the warp density is 310 - 380 ends / 10 cm, the weft density is 190 - 260 picks / 10 cm, the warp tightness is 65% - 75%, and the weft tightness is 45% - 50%; yarn B is woven by a rib knitting machine with a change triangle in a compound way of rib stitch and plain stitch. During weaving, the first system weaves a 1 + 1 rib row, the lower needles of the second system all participate in working and weave a row of right - hand plain stitch, and the upper needles of the third system all participate in working and weave a row of wrong - hand plain stitch. These two rows of single - face plain stitch form a complete coil row.

[0040] For the preparation method of a lightweight anti - transparent and quick - drying fabric for swimsuits as described above, the spraying amount of lye on the outer surface of the fabric is 20 - 30 mL / m 2 , the lye is composed of NaOH, ethanol and water, the concentration of NaOH is 6 g / L, and the concentration of ethanol is 3 mL / L; the heat treatment means: heating up to 130 °C at a heating rate of 2 °C / min in an infrared dyeing machine and then holding for 40 min; after heat treatment, post - treatment is carried out (washing, drying, and drying at 105 °C for 2 h).

[0041] The preparation method of a lightweight anti - transparent and quick - drying fabric for swimsuits as described in any of the above, the water absorption rate of the lightweight anti - transparent and quick - drying fabric for swimsuits is ≥150%, the water droplet diffusion time is ≤2 s, the wicking height is ≥110 mm, the drying rate is ≥0.4 g / h, and the anti - transparency index S > 97.

[0042] Beneficial effects:

[0043] (1) The swimsuit fabric prepared by the present invention adopts a two - layer structure, with fewer layers and a lightweight structure, which improves the comfort of the wearer. Functional particles such as titanium dioxide have a scattering effect on light, and the anti - transparency function can be generated without multiple layers being stacked. Moreover, the functional particles also have a strong scattering effect on ultraviolet rays, producing a sunscreen effect.

[0044] (2) The surfaces of the inner - layer fibers and outer - layer fibers of the swimsuit fabric prepared by the present invention both have a large number of protrusions. A large number of grooves and capillary - like channels are formed through the protrusions, which can timely absorb and conduct the sweat and heat emitted by the body during swimming warm - up. When the swimmer comes ashore after swimming, the water on the swimsuit can quickly evaporate, realizing the quick - drying function, reducing the stickiness brought by the water on the swimsuit to the swimmer, and improving comfort.

[0045] (3) The inner layer of the swimsuit fabric prepared by the present invention is made of nylon 6 fibers, which can reduce the adhesion to the skin, improve the skin - friendly effect of the swimsuit, and improve the comfort of the wearer.

[0046] (4) There are a large number of grooves between the protrusions on the surface of the same fiber of the swimsuit fabric prepared by the present invention. The grooves are beneficial to the attachment of dyeing particles, making the fabric have good dyeability and a variety of colors, better meeting the needs of consumers for the colors of swimsuits.

[0047] (5) In the preparation method of the present invention, functional particles are added to the matrix, and the swimsuit fabric can be obtained through the fiber - forming process and the weaving process. The fiber - forming process is applicable to existing melt - spinning equipment, and the weaving difficulty is also low. The method is simple and is conducive to large - scale industrial application. Specific embodiments

[0048] The following further elaborates the present invention in combination 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.

[0049] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0050] Average degree of polymerization: Tested by gel permeation chromatography (GPC).

[0051] Linear density: Tested in accordance with GB / T 16256-2008.

[0052] Water absorption rate: Tested in accordance with the water absorption rate detection method in 8.1 of GB / T 21655.1-2023.

[0053] Water droplet diffusion time: Tested in accordance with 8.2 water droplet diffusion time in GB / T 21655.1-2023.

[0054] Wicking height: Tested in accordance with 8.4 wicking height in GB / T 21655.1-2023.

[0055] Drying rate: Tested in accordance with 8.3 drying rate in GB / T 21655.1-2023.

[0056] Anti-transparency index S: Tested in accordance with GB / T 42698-2023.

[0057] Example 1

[0058] A preparation method of a lightweight anti-transparent and quick-drying fabric for swimsuits, the specific steps are as follows:

[0059] (1) Preparation of raw materials;

[0060] Coupling agent a: A mixture of γ-aminopropyltriethoxysilane and trifluorooctyltrimethoxysilane with a mass ratio of 1:1;

[0061] Functional particle a: Titanium dioxide;

[0062] Dicarboxylic acid a: Terephthalic acid;

[0063] Diol: Ethylene glycol;

[0064] Catalyst a: Antimony glycolate;

[0065] Coupling agent b: γ-aminopropyltriethoxysilane;

[0066] Functional particle b: Silicon dioxide;

[0067] Dicarboxylic acid b: Succinic acid;

[0068] Diamine: Pentamethylenediamine;

[0069] Deionized water;

[0070] Catalyst b: Tetrabutyl titanate;

[0071] Polyester: PET with an average degree of polymerization of 600;

[0072] Nylon 6: Average degree of polymerization of 200;

[0073] Alkali solution: Composed of NaOH, ethanol and water, with the concentration of NaOH being 6 g / L and the concentration of ethanol being 3 mL / L;

[0074] (2) Prepare coated and modified functional particle a and coated and modified functional particle b respectively;

[0075] The preparation process of the coated and modified functional particle a is as follows:

[0076] (a) In a high-speed mixer, under the conditions of a rotation speed of 3000 r / min and a temperature of 80 °C, use coupling agent a to organically modify functional particle a for 2.5 h to obtain coupling agent-modified functional particle a; among them, the mass of coupling agent a is 5% of the mass of functional particle a;

[0077] (b) Add dibasic acid a and diol to a reaction kettle, stir and heat up to 200 °C, control the pressure of the reaction system to be 0.2 MPa, after reacting for 4 h, add catalyst a, control the reaction system to gradually heat up to 270 °C, evacuate to 75 Pa, after reacting for 2.5 h, cool down to 230 °C to obtain a polyester oligomer with an average degree of polymerization of 40; among them, the molar ratio of dibasic acid a to diol is 1:0.95; the mass of catalyst a is 0.1% of the mass of dibasic acid a;

[0078] (c) Add the coupling agent-modified functional particle a to the reaction system in step (b), stir to make it fully mixed, keep the temperature for reaction for 0.5 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain the coated and modified functional particle a with a D50 particle size of 200 nm; among them, the mass ratio of the coupling agent-modified functional particle a to the polyester oligomer is 5:1;

[0079] The preparation process of the coated and modified functional particle b is as follows:

[0080] (Ⅰ) In a high-speed mixer, under the conditions of a rotation speed of 3000 r / min and a temperature of 80 °C, use coupling agent b to organically modify functional particle b for 2.5 h to obtain coupling agent-modified functional particle b; among them, the mass of coupling agent b is 5% of the mass of functional particle b;

[0081] (II) Add dibasic acid b, diamine, and deionized water into a reaction kettle. After displacing the air in the reaction kettle with nitrogen or an inert gas (i.e., introducing nitrogen or an inert gas at 0.3 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), react at 250 °C and 1.3 MPa for 3 h. Then reduce the pressure to 0.1 MPa, add catalyst b, raise the temperature to 260 °C, and turn on the vacuum pump to maintain a vacuum degree of 75 Pa and react for 2 h. Then raise the pressure to 0.1 MPa and lower the temperature to 220 °C to obtain a nylon 6 oligomer with an average degree of polymerization of 45; wherein, the molar ratio of dibasic acid b to diamine is 1:0.9, the molar ratio of deionized water to dibasic acid b is 0.3:1, and the mass of catalyst b is 0.06% of the mass of dibasic acid b;

[0082] (III) Add coupling agent-modified functional particle b to the reaction system in step (II), stir to mix it evenly, keep the temperature for reaction for 0.5 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain coated and modified functional particle b with a D50 particle size of 50 nm; wherein, the mass ratio of coupling agent-modified functional particle b to nylon 6 oligomer b is 6.5:1;

[0083] (3) Prepare spinning melt a and spinning melt b respectively;

[0084] The preparation process of spinning melt a is as follows: First, melt-blend polyester with coated and modified functional particle a to obtain masterbatch a with a concentration of 60 wt%. Then, perform solid-phase viscosity increase on masterbatch a at 190 °C in an atmosphere of nitrogen or an inert gas for 30 h. Then, melt-blend the solid-phase viscosity-increased masterbatch a with polyester to obtain spinning melt a containing 10 wt% of coated and modified functional particle a;

[0085] The preparation process of spinning melt b is as follows: First, melt-blend nylon 6 with coated and modified functional particle b to obtain masterbatch b with a concentration of 58 wt%. Then, melt-blend masterbatch b with nylon 6 to obtain spinning melt b containing 10 wt% of coated and modified functional particle b;

[0086] (4) Prepare yarn A and yarn B respectively;

[0087] The preparation process of yarn A is as follows: Directly spin spinning melt a according to the FDY process and perform drawing with four pairs of drawing rollers during the spinning process to obtain fiber A with a specification of 100 D / 72 F. Then, weave fiber A using a high-density twill weave to obtain yarn A with a linear density of 1.4 dtex, a warp density of 310 ends / 10 cm, a weft density of 190 picks / 10 cm, a warp tightness of 65%, and a weft tightness of 50%;

[0088] The preparation process of yarn B is as follows: directly spinning the spinning melt b according to the FDY process, and performing stretching with four pairs of stretching rollers during the spinning process to obtain fiber B with a specification of 20D / 36F. Then, using a rib knitting machine with a change triangle, weaving fiber B in a composite manner of rib stitch and plain stitch to obtain yarn B with a linear density of 0.6 dtex;

[0089] During the preparation processes of yarn A and yarn B, the temperature of the first pair of stretching rollers is 100 °C, the temperature of the second pair of stretching rollers is 135 °C, the temperature of the third pair of stretching rollers is 180 °C, and the temperature of the fourth pair of stretching rollers is 200 °C; the spinning speed of the first pair of stretching rollers is 400 m / min, the spinning speed of the second pair of stretching rollers is 1250 m / min, the spinning speed of the third pair of stretching rollers is 2500 m / min, and the spinning speed of the fourth pair of stretching rollers is 2600 m / min;

[0090] (5)Preparing a lightweight anti-transparent and quick-drying fabric for swimsuits;

[0091] Using yarn A as the outer layer yarn and yarn B as the inner layer yarn, weaving them into a fabric by the shuttle weaving method. After spraying lye on the outer surface of the fabric by spraying, placing it in an infrared dyeing machine and heating it to 130 °C at a heating rate of 2 °C / min and then holding for 40 min, the lightweight anti-transparent and quick-drying fabric for swimsuits is obtained; among them, the spraying amount of lye on the outer surface of the fabric is 20 mL / m 2 。

[0092] The water absorption rate of the finally obtained lightweight anti-transparent and quick-drying fabric for swimsuits is 158%, the water droplet diffusion time is 1.5 s, the wicking height is 116 mm, the drying rate is 0.47 g / h, and the anti-perspective index S is 97.5.

[0093] Comparative Example 1

[0094] A preparation method of a fabric is basically the same as that of Example 1, the difference is only that: in step (Ⅲ), the process parameters of pre-crushing and airflow crushing are adjusted, so that the D50 particle size of the coated and modified functional particles b is 40 nm.

[0095] The water absorption rate of the finally obtained fabric is 123%, the water droplet diffusion time is 5.7 s, the wicking height is 74 mm, and the drying rate is 0.2 g / h.

[0096] Compared with Comparative Example 1, the moisture absorption, moisture conduction and quick-drying properties of the fabric are greatly reduced. This is because the D50 particle size of functional particle b is too small, resulting in a decrease in the number of convex structures formed on the surface of fiber B and an insufficiently dense distribution. It is difficult to form enough and effective grooves on the surface of fiber B, and it is also difficult to form a large number of capillary-like channels conducive to rapid water conduction between different fiber Bs. As a result, the rapid spreading and conduction of water on the surface of fiber B are affected, the moisture absorption and moisture conduction properties of the fabric become poor, and the efficient quick-drying function cannot be achieved.

[0097] Example 2

[0098] A preparation method of a lightweight anti-transparent and quick-drying fabric for swimsuits is as follows:

[0099] (1)Preparation of raw materials;

[0100] Coupling agent a: A mixture of γ-aminopropyltriethoxysilane and perfluorodecyltrimethoxysilane with a mass ratio of 1:3;

[0101] Functional particle a: Titanium dioxide;

[0102] Dicarboxylic acid a: Terephthalic acid;

[0103] Diol: Ethylene glycol;

[0104] Catalyst a: Antimony glycolate;

[0105] Coupling agent b: γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0106] Functional particle b: Titanium dioxide;

[0107] Dicarboxylic acid b: Glutaric acid;

[0108] Diamine: Pentamethylenediamine;

[0109] Deionized water;

[0110] Catalyst b: Tetrabutyl titanate;

[0111] Polyester: PET with an average degree of polymerization of 600;

[0112] Nylon 6: Average degree of polymerization of 200;

[0113] Alkali solution: Composed of NaOH, ethanol and water, the concentration of NaOH is 6 g / L, and the concentration of ethanol is 3 mL / L;

[0114] (2)Prepare coated and modified functional particle a and coated and modified functional particle b respectively;

[0115] The preparation process of coated and modified functional particle a is as follows:

[0116] (a) In a high-speed blender, under the conditions of a rotational speed of 2800 r / min and a temperature of 100 °C, functional particle a was organically modified with coupling agent a for 2.8 h to obtain coupling agent-modified functional particle a; among them, the mass of coupling agent a was 3% of the mass of functional particle a;

[0117] (b) Dicarboxylic acid a and diol were added to a reaction kettle, stirred and heated to 200 °C, the pressure of the reaction system was controlled at 0.2 MPa, after reacting for 3.5 h, catalyst a was added, the reaction system was gradually heated to 265 °C, evacuated to 78 Pa, and after reacting for 2.5 h, it was cooled to 230 °C to obtain a polyester oligomer with an average degree of polymerization of 45; among them, the molar ratio of dicarboxylic acid a to diol was 1:0.92; the mass of catalyst a was 0.04% of the mass of dicarboxylic acid a;

[0118] (c) Coupling agent-modified functional particle a was added to the reaction system of step (b), stirred to mix it evenly, kept warm and reacted for 0.7 h, continuously evacuated, discharged, cooled, pre-crushed, and air-flow crushed to obtain coated and modified functional particle a with a D50 particle size of 300 nm; among them, the mass ratio of coupling agent-modified functional particle a to polyester oligomer was 8:1;

[0119] The preparation process of coated and modified functional particle b is as follows:

[0120] (Ⅰ) In a high-speed blender, under the conditions of a rotational speed of 2800 r / min and a temperature of 100 °C, functional particle b was organically modified with coupling agent b for 2.8 h to obtain coupling agent-modified functional particle b; among them, the mass of coupling agent b was 3% of the mass of functional particle b;

[0121] (Ⅱ) Dicarboxylic acid b, diamine, and deionized water were added to a reaction kettle. After replacing the air in the reaction kettle with nitrogen or an inert gas (that is, introducing nitrogen or an inert gas at 0.45 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), the reaction was carried out at 250 °C and 1.5 MPa for 3 h, then the pressure was reduced to 0.1 MPa, catalyst b was added, the temperature was raised to 260 °C, and the vacuum pump was turned on to keep the vacuum degree at 78 Pa. After reacting for 3 h, the pressure was raised to 0.1 MPa again, and the temperature was cooled to 220 °C to obtain a nylon 6 oligomer with an average degree of polymerization of 40; among them, the molar ratio of dicarboxylic acid b to diamine was 1:0.93, the molar ratio of deionized water to dicarboxylic acid b was 0.33:1, and the mass of catalyst b was 0.01% of the mass of dicarboxylic acid b;

[0122] (III) Add coupling agent-modified functional particle b to the reaction system of step (II), stir to mix it evenly, keep the temperature for reaction for 1 h, continuously evacuate, discharge, cool, pre-crush, and air-flow crush to obtain coated and modified functional particle b with a D50 particle size of 150 nm; wherein, the mass ratio of the coupling agent-modified functional particle b to nylon 6 oligomer b is 5:1;

[0123] (3) Prepare spinning melt a and spinning melt b respectively;

[0124] The preparation process of spinning melt a is as follows: First, melt-blend polyester with coated and modified functional particle a to obtain masterbatch a with a concentration of 55 wt%, then solid-phase viscosity increase masterbatch a for 28 h at a temperature of 195 °C in an atmosphere of nitrogen or inert gas, and then melt-blend the solid-phase viscosity-increased masterbatch a with polyester to obtain spinning melt a containing 12 wt% of coated and modified functional particle a;

[0125] The preparation process of spinning melt b is as follows: First, melt-blend nylon 6 with coated and modified functional particle b to obtain masterbatch b with a concentration of 65 wt%, and then melt-blend masterbatch b with nylon 6 to obtain spinning melt b containing 12 wt% of coated and modified functional particle b;

[0126] (4) Prepare yarn A and yarn B respectively;

[0127] The preparation process of yarn A is as follows: Directly spin spinning melt a according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain fiber A with a specification of 80 D / 48 F, and then weave fiber A by using a high-density twill weaving method to obtain yarn A with a linear density of 1.6 dtex, a warp density of 330 ends / 10 cm, a weft density of 260 picks / 10 cm, a warp tightness of 75%, and a weft tightness of 48%;

[0128] The preparation process of yarn B is as follows: Directly spin spinning melt b according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain fiber B with a specification of 50 D / 48 F, and then weave fiber B by using a rib knitting machine with a change triangle in a composite manner of rib stitch and plain stitch to obtain yarn B with a linear density of 1 dtex;

[0129] During the preparation processes of yarn A and yarn B, the temperature of the first pair of stretching rollers is 100 °C, the temperature of the second pair of stretching rollers is 130 °C, the temperature of the third pair of stretching rollers is 180 °C, and the temperature of the fourth pair of stretching rollers is 210 °C; the spinning speed of the first pair of stretching rollers is 400 m / min, the spinning speed of the second pair of stretching rollers is 1200 m / min, the spinning speed of the third pair of stretching rollers is 2400 m / min, and the spinning speed of the fourth pair of stretching rollers is 2600 m / min;

[0130] (5) Preparation of a lightweight anti - penetration and quick - drying fabric for swimsuits;

[0131] Use yarn A as the outer yarn and yarn B as the inner yarn, and weave them into a fabric by the shuttle - weaving method. After spraying lye on the outer surface of the fabric, place it in an infrared dyeing machine and heat it to 130 °C at a heating rate of 2 °C / min and then keep it warm for 40 min to obtain the lightweight anti - penetration and quick - drying fabric for swimsuits; among them, the spraying amount of lye on the outer surface of the fabric is 22 mL / m 2 .

[0132] The water absorption rate of the finally obtained lightweight anti - penetration and quick - drying fabric for swimsuits is 160%, the water droplet diffusion time is 1.3 s, the wicking height is 119 mm, the drying rate is 0.5 g / h, and the anti - transparency index S is 97.2.

[0133] Example 3

[0134] A preparation method of a lightweight anti - penetration and quick - drying fabric for swimsuits, the specific steps are as follows:

[0135] (1) Preparation of raw materials;

[0136] Coupling agent a: A mixture of γ - aminopropyltriethoxysilane and tridecafluorooctyltrimethoxysilane with a mass ratio of 1:5;

[0137] Functional particle a: Titanium dioxide;

[0138] Dicarboxylic acid a: Terephthalic acid;

[0139] Diol: Propylene glycol;

[0140] Catalyst a: Antimony glycolate;

[0141] Coupling agent b: N - (β - aminoethyl) - γ - aminopropyltrimethoxysilane;

[0142] Functional particle b: Zinc oxide;

[0143] Dicarboxylic acid b: Adipic acid;

[0144] Diamine: Ethylenediamine;

[0145] Deionized water;

[0146] Catalyst b: Tetrabutyl titanate;

[0147] Polyester: PET with an average degree of polymerization of 720;

[0148] Nylon 6: With an average degree of polymerization of 150;

[0149] Alkaline solution: Composed of NaOH, ethanol and water, with the concentration of NaOH being 6 g / L and the concentration of ethanol being 3 mL / L;

[0150] (2) Prepare coated modified functional particle a and coated modified functional particle b respectively;

[0151] The preparation process of the coated modified functional particle a is as follows:

[0152] (a) In a high-speed mixer, under the conditions of a rotation speed of 3000 r / min and a temperature of 100 °C, use coupling agent a to organically modify functional particle a for 2 h to obtain coupling agent-modified functional particle a; among them, the mass of coupling agent a is 3.5% of the mass of functional particle a;

[0153] (b) Add dibasic acid a and diol to a reaction kettle, stir and heat up to 210 °C, control the pressure of the reaction system to be 0.23 MPa, after reacting for 3 h, add catalyst a, control the reaction system to gradually heat up to 268 °C, evacuate to 70 Pa, after reacting for 2 h, cool down to 230 °C to obtain a polyester oligomer with an average degree of polymerization of 60; among them, the molar ratio of dibasic acid a to diol is 1:0.9; the mass of catalyst a is 0.01% of the mass of dibasic acid a;

[0154] (c) Add the coupling agent-modified functional particle a to the reaction system in step (b), stir to make it fully mixed, keep the temperature for reaction for 1 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain the coated modified functional particle a with a D50 particle size of 250 nm; among them, the mass ratio of the coupling agent-modified functional particle a to the polyester oligomer is 7:1;

[0155] The preparation process of the coated modified functional particle b is as follows:

[0156] (Ⅰ) In a high-speed mixer, under the conditions of a rotation speed of 3000 r / min and a temperature of 100 °C, use coupling agent b to organically modify functional particle b for 2 h to obtain coupling agent-modified functional particle b; among them, the mass of coupling agent b is 3.5% of the mass of functional particle b;

[0157] (II) Add dibasic acid b, diamine, and deionized water into the reaction kettle. After replacing the air in the reaction kettle with nitrogen or inert gas (i.e., introducing nitrogen or inert gas at 0.5 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), react at 250 °C and 1.65 MPa for 3 h. Then reduce the pressure to 0.1 MPa, add catalyst b, raise the temperature to 260 °C, and turn on the vacuum pump to maintain a vacuum degree of 66 Pa and react for 2.5 h. Then increase the pressure to 0.1 MPa and cool down to 220 °C to obtain a nylon 6 oligomer with an average degree of polymerization of 52; wherein, the molar ratio of dibasic acid b to diamine is 1:0.9, the molar ratio of deionized water to dibasic acid b is 0.4:1, and the mass of catalyst b is 0.03% of the mass of dibasic acid b.

[0158] (III) Add coupling agent-modified functional particle b to the reaction system in step (II), stir to mix it evenly, keep the temperature for reaction for 0.8 h, continuously evacuate, discharge, cool, pre-crush, and air-flow crush to obtain coated and modified functional particle b with a D50 particle size of 300 nm; wherein, the mass ratio of coupling agent-modified functional particle b to nylon 6 oligomer b is 6:1.

[0159] (3) Prepare spinning melt a and spinning melt b respectively.

[0160] The preparation process of spinning melt a is as follows: First, melt-blend polyester with coated and modified functional particle a to obtain masterbatch a with a concentration of 65 wt%. Then, subject masterbatch a to solid-phase viscosity increase at 200 °C in an atmosphere of nitrogen or inert gas for 26 h. Then, melt-blend the solid-phase viscosity-increased masterbatch a with polyester to obtain spinning melt a containing 8 wt% of coated and modified functional particle a.

[0161] The preparation process of spinning melt b is as follows: First, melt-blend nylon 6 with coated and modified functional particle b to obtain masterbatch b with a concentration of 60 wt%. Then, melt-blend masterbatch b with nylon 6 to obtain spinning melt b containing 8 wt% of coated and modified functional particle b.

[0162] (4) Prepare yarn A and yarn B respectively.

[0163] The preparation process of yarn A is as follows: Directly spin spinning melt a according to the FDY process and perform drawing with four pairs of drawing rollers during the spinning process to obtain fiber A with a specification of 75 D / 48 F. Then, weave fiber A using a high-density twill weave to obtain yarn A with a linear density of 1.6 dtex, a warp density of 380 ends / 10 cm, a weft density of 230 picks / 10 cm, a warp tightness of 75%, and a weft tightness of 45%.

[0164] The preparation process of yarn B is as follows: directly spin the spinning melt b according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain fiber B with a specification of 50D / 72F. Then, use a rib knitting machine with a change triangle to weave fiber B in a composite manner of rib stitch and plain stitch to obtain yarn B with a linear density of 0.7 dtex;

[0165] During the preparation processes of yarn A and yarn B, the temperature of the first pair of stretching rollers is 120°C, the temperature of the second pair of stretching rollers is 150°C, the temperature of the third pair of stretching rollers is 200°C, and the temperature of the fourth pair of stretching rollers is 240°C; the spinning speed of the first pair of stretching rollers is 430 m / min, the spinning speed of the second pair of stretching rollers is 1300 m / min, the spinning speed of the third pair of stretching rollers is 2500 m / min, and the spinning speed of the fourth pair of stretching rollers is 2800 m / min;

[0166] (5) Prepare a lightweight anti-permeable and quick-drying fabric for swimsuits;

[0167] Use yarn A as the outer layer yarn and yarn B as the inner layer yarn to weave into a fabric by weaving. After spraying lye on the outer surface of the fabric by spraying, place it in an infrared dyeing machine and heat it to 130°C at a heating rate of 2°C / min and keep it warm for 40 min to obtain the lightweight anti-permeable and quick-drying fabric for swimsuits; among them, the spraying amount of lye on the outer surface of the fabric is 30 mL / m 2 。

[0168] The water absorption rate of the finally obtained lightweight anti-permeable and quick-drying fabric for swimsuits is 154%, the water droplet diffusion time is 1.8 s, the wicking height is 115 mm, the drying rate is 0.44 g / h, and the anti-perspective index S is 98.2.

[0169] Comparative Example 2

[0170] A method for preparing a fabric is basically the same as that in Example 3, except that: in step (3), the content of the coated and modified functional particles a in the spinning melt a is 6 wt%.

[0171] The water absorption rate of the finally obtained fabric is 138%, the water droplet diffusion time is 3.3 s, the wicking height is 91 mm, the drying rate is 0.28 g / h, and the anti-perspective index S is 88.2.

[0172] Compared with Example 3, the moisture absorption and moisture conduction performance, quick-drying property and anti-transparency of the fabric in Comparative Example 2 decreased significantly. This is because the content of the coated and modified functional particles a in the spinning melt a was too low, resulting in a decrease in the number of convex structures formed on the surface of fiber A and an insufficiently dense distribution. It was difficult to form enough and effective grooves on the surface of fiber A, and it was also difficult to form a large number of capillary-like channels conducive to the rapid conduction of water between different fiber As. As a result, the rapid spreading and conduction of water on the surface of fiber A were affected, making the moisture absorption and moisture conduction performance of the fabric poor and unable to achieve an efficient quick-drying function. At the same time, the decrease in the number of convex structures and the insufficiently dense distribution also weakened the light scattering effect of the fabric, making it difficult to achieve a good anti-transparency effect by the light scattering of the functional particles a themselves. Moreover, since yarn A was used as the outer yarn of the fabric, the anti-transparency of the fabric also decreased significantly.

[0173] Comparative Example 3

[0174] A method for preparing a fabric is basically the same as that in Example 3, except that: in step (3), the content of the coated and modified functional particles b in the spinning melt b is 6 wt%.

[0175] The water absorption rate of the finally prepared fabric is 106%, the water droplet diffusion time is 4.9 s, the wicking height is 83 mm, and the drying rate is 2.1 g / h.

[0176] Compared with Example 3, the moisture absorption and moisture conduction performance and quick-drying property of the fabric in Comparative Example 3 decreased significantly. This is because the content of the coated and modified functional particles b in the spinning melt b was too low, resulting in a decrease in the number of convex structures formed on the surface of fiber B and an insufficiently dense distribution. It was difficult to form enough and effective grooves on the surface of fiber B, and it was also difficult to form a large number of capillary-like channels conducive to the rapid conduction of water between different fiber Bs. As a result, the rapid spreading and conduction of water on the surface of fiber B were affected, making the moisture absorption and moisture conduction performance of the fabric poor and unable to achieve an efficient quick-drying function.

[0177] Example 4

[0178] A method for preparing a lightweight anti-transparent and quick-drying fabric for swimwear is as follows:

[0179] (1) Preparation of raw materials;

[0180] Coupling agent a: A mixture of γ-aminopropyltriethoxysilane and trifluorooctyltrimethoxysilane with a mass ratio of 1:5;

[0181] Functional particle a: Titanium dioxide;

[0182] Dicarboxylic acid a: Terephthalic acid;

[0183] Diol: Butanediol;

[0184] Catalyst a: Tetrabutyl titanate;

[0185] Coupling agent b: Isopropyltriisostearoyl titanate;

[0186] Functional particle b: Silicon dioxide;

[0187] Dicarboxylic acid b: Suberic acid;

[0188] Diamine: Ethylenediamine;

[0189] Deionized water;

[0190] Catalyst b: Tetrabutyl titanate;

[0191] Polyester: PET with an average degree of polymerization of 720;

[0192] Nylon 6: With an average degree of polymerization of 150;

[0193] Alkali solution: Composed of NaOH, ethanol and water, with the concentration of NaOH being 6 g / L and the concentration of ethanol being 3 mL / L;

[0194] (2) Prepare coated and modified functional particle a and coated and modified functional particle b respectively;

[0195] The preparation process of coated and modified functional particle a is as follows:

[0196] (a) In a high-speed mixer, under the conditions of a rotation speed of 2500 r / min and a temperature of 90 °C, functional particle a is organically modified with coupling agent a for 3 h to obtain coupling agent-modified functional particle a; among them, the mass of coupling agent a is 4.5% of the mass of functional particle a;

[0197] (b) Add dicarboxylic acid a and diol into a reaction kettle, stir and heat up to 230 °C, control the pressure of the reaction system to be 0.3 MPa, after reacting for 5 h, add catalyst a, control the reaction system to gradually heat up to 270 °C, evacuate to 65 Pa, after reacting for 3 h, cool down to 230 °C to obtain a polyester oligomer with an average degree of polymerization of 55; among them, the molar ratio of dicarboxylic acid a to diol is 1:0.92; the mass of catalyst a is 0.1% of the mass of dicarboxylic acid a;

[0198] (c) Add coupling agent-modified functional particle a to the reaction system in step (b), stir to make it fully mixed, keep the temperature for reaction for 0.8 h, continuously evacuate, discharge, cool, pre-crush, and air-crush to obtain coated and modified functional particle a with a D50 particle size of 100 nm; among them, the mass ratio of coupling agent-modified functional particle a to the polyester oligomer is 6:1;

[0199] The preparation process of coated and modified functional particle b is as follows:

[0200] (I) In a high-speed mixer, under the conditions of a rotational speed of 2500 r / min and a temperature of 90 °C, functional particle b was organically modified with coupling agent b for 3 h to obtain coupling agent-modified functional particle b; among them, the mass of coupling agent b was 4.5% of the mass of functional particle b;

[0201] (II) Dibasic acid b, diamine, and deionized water were added to a reaction kettle. After replacing the air in the reaction kettle with nitrogen or an inert gas (that is, introducing nitrogen or an inert gas at 0.6 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), the reaction was carried out at 250 °C and 1.8 MPa for 3 h, then the pressure was reduced to 0.1 MPa, catalyst b was added, the temperature was raised to 260 °C, and a vacuum pump was turned on to maintain a vacuum degree of 72 Pa, and the reaction was carried out for 3 h. Then the pressure was raised to 0.1 MPa, and the temperature was lowered to 220 °C to obtain a nylon 6 oligomer with an average degree of polymerization of 60; among them, the molar ratio of dibasic acid b to diamine was 1:0.95, the molar ratio of deionized water to dibasic acid b was 0.35:1, and the mass of catalyst b was 0.1% of the mass of dibasic acid b;

[0202] (III) Coupling agent-modified functional particle b was added to the reaction system in step (II), stirred to make it fully mixed, the heat preservation reaction was carried out for 0.6 h, the vacuum was continuously pumped, the material was discharged, cooled, pre-crushed, and air-flow crushed to obtain coated and modified functional particle b with a D50 particle size of 220 nm; among them, the mass ratio of coupling agent-modified functional particle b to nylon 6 oligomer b was 7:1;

[0203] (3) Spinning melts a and b were respectively prepared;

[0204] The preparation process of spinning melt a was as follows: First, polyester and coated and modified functional particle a were melt-blended to obtain masterbatch a with a concentration of 50 wt%, then masterbatch a was solid-phase viscosity-increased at 205 °C under an atmosphere of nitrogen or an inert gas for 24 h, and then the solid-phase viscosity-increased masterbatch a was melt-blended with polyester to obtain spinning melt a containing 15 wt% of coated and modified functional particle a;

[0205] The preparation process of spinning melt b was as follows: First, nylon 6 and coated and modified functional particle b were melt-blended to obtain masterbatch b with a concentration of 50 wt%, and then masterbatch b was melt-blended with nylon 6 to obtain spinning melt b containing 15 wt% of coated and modified functional particle b;

[0206] (4) Yarns A and B were respectively prepared;

[0207] The preparation process of Yarn A is as follows: directly spin the spinning melt a according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain Fiber A with a specification of 90D / 72F. Then, weave Fiber A using a high-density twill weave to obtain Yarn A with a linear density of 1.3 dtex, a warp density of 380 ends / 10 cm, a weft density of 240 ends / 10 cm, a warp tightness of 70%, and a weft tightness of 50%.

[0208] The preparation process of Yarn B is as follows: directly spin the spinning melt b according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain Fiber B with a specification of 40D / 48F. Then, use a rib knitting machine with a change triangle to weave Fiber B in a composite manner of rib stitch and plain stitch to obtain Yarn B with a linear density of 0.8 dtex.

[0209] During the preparation processes of Yarn A and Yarn B, the temperature of the first pair of stretching rollers is 105 °C, the temperature of the second pair of stretching rollers is 135 °C, the temperature of the third pair of stretching rollers is 190 °C, and the temperature of the fourth pair of stretching rollers is 220 °C; the spinning speed of the first pair of stretching rollers is 450 m / min, the spinning speed of the second pair of stretching rollers is 1200 m / min, the spinning speed of the third pair of stretching rollers is 2400 m / min, and the spinning speed of the fourth pair of stretching rollers is 2650 m / min.

[0210] (5)Prepare a lightweight anti-transparent and quick-drying fabric for swimsuits;

[0211] Weave Yarn A as the outer yarn and Yarn B as the inner yarn into a fabric by weaving. After spraying lye on the outer surface of the fabric, place it in an infrared dyeing machine and heat it to 130 °C at a heating rate of 2 °C / min and keep it warm for 40 min to obtain the lightweight anti-transparent and quick-drying fabric for swimsuits; among them, the spraying amount of lye on the outer surface of the fabric is 25 mL / m 2 。

[0212] The finally obtained lightweight anti-transparent and quick-drying fabric for swimsuits has a water absorption rate of 167%, a water droplet diffusion time of 1.1 s, a wicking height of 125 mm, a drying rate of 0.53 g / h, and an anti-perspective index S of 98.3.

[0213] Example 5

[0214] A preparation method of a lightweight anti-transparent and quick-drying fabric for swimsuits, the specific steps are as follows:

[0215] (1)Preparation of raw materials;

[0216] Coupling agent a: a mixture of γ-aminopropyltriethoxysilane and perfluorodecyltrimethoxysilane with a mass ratio of 1:1;

[0217] Functional particle a: Titanium dioxide;

[0218] Dicarboxylic acid a: Terephthalic acid;

[0219] Diol: Butanediol;

[0220] Catalyst a: Tetrabutyl titanate;

[0221] Coupling agent b: Tridecafluorooctyltrimethoxysilane;

[0222] Functional particle b: Titanium dioxide;

[0223] Dicarboxylic acid b: Sebacic acid;

[0224] Diamine: Pentanediamine;

[0225] Deionized water;

[0226] Catalyst b: Tetrabutyl titanate;

[0227] Polyester: PET with an average degree of polymerization of 720;

[0228] Nylon 6: With an average degree of polymerization of 200;

[0229] Alkali solution: Composed of NaOH, ethanol and water, with the concentration of NaOH being 6 g / L and the concentration of ethanol being 3 mL / L;

[0230] (2) Prepare coated and modified functional particle a and coated and modified functional particle b respectively;

[0231] The preparation process of the coated and modified functional particle a is as follows:

[0232] (a) In a high-speed blender, under the conditions of a rotation speed of 2800 r / min and a temperature of 90 °C, the functional particle a is organically modified with coupling agent a for 2.5 h to obtain the coupling agent-modified functional particle a; among them, the mass of coupling agent a is 4% of the mass of functional particle a;

[0233] (b) Add dicarboxylic acid a and diol into a reaction kettle, stir and heat up to 200 °C, control the pressure of the reaction system to be 0.28 MPa, after reacting for 4 h, add catalyst a, control the reaction system to gradually heat up to 260 °C, evacuate to 75 Pa, and after reacting for 2.8 h, cool down to 230 °C to obtain a polyester oligomer with an average degree of polymerization of 60; among them, the molar ratio of dicarboxylic acid a to diol is 1:0.95; the mass of catalyst a is 0.08% of the mass of dicarboxylic acid a;

[0234] (c) Add coupling agent-modified functional particle a to the reaction system in step (b), stir to mix it evenly, keep the temperature for reaction for 0.5 h, continuously evacuate, discharge, cool, pre-crush, and air-flow crush to obtain coated and modified functional particle a with a D50 particle size of 50 nm; wherein, the mass ratio of the coupling agent-modified functional particle a to the polyester oligomer is 8:1;

[0235] The preparation process of the coated and modified functional particle b is as follows:

[0236] (Ⅰ) In a high-speed mixer, under the conditions of a rotation speed of 2800 r / min and a temperature of 90 °C, use coupling agent b to organically modify functional particle b for 2.5 h to obtain coupling agent-modified functional particle b; wherein, the mass of coupling agent b is 4% of the mass of functional particle b;

[0237] (Ⅱ) Add dibasic acid b, diamine, and deionized water to the reaction kettle. After replacing the air in the reaction kettle with nitrogen or inert gas (that is, introducing nitrogen or inert gas at 0.6 MPa into the reaction kettle, opening the exhaust valve to discharge, and repeating 3 times), react at 250 °C and 1.8 MPa for 3 h, then reduce the pressure to 0.1 MPa, add catalyst b, raise the temperature to 260 °C, and turn on the vacuum pump to keep the vacuum degree at 70 Pa, react for 3 h, then raise the pressure to 0.1 MPa, and cool down to 220 °C to obtain nylon 6 oligomer with an average degree of polymerization of 55; wherein, the molar ratio of dibasic acid b to diamine is 1:0.9, the molar ratio of deionized water to dibasic acid b is 0.3:1, and the mass of catalyst b is 0.08% of the mass of dibasic acid b;

[0238] (Ⅲ) Add coupling agent-modified functional particle b to the reaction system in step (Ⅱ), stir to mix it evenly, keep the temperature for reaction for 1 h, continuously evacuate, discharge, cool, pre-crush, and air-flow crush to obtain coated and modified functional particle b with a D50 particle size of 100 nm; wherein, the mass ratio of the coupling agent-modified functional particle b to nylon 6 oligomer b is 8:1;

[0239] (3) Prepare spinning melt a and spinning melt b respectively;

[0240] The preparation process of spinning melt a is as follows: First, melt-blend polyester with coated and modified functional particle a to obtain masterbatch a with a concentration of 58 wt%, then solid-phase viscosity increase masterbatch a at 210 °C under an atmosphere of nitrogen or inert gas for 20 h, and then melt-blend the solid-phase viscosity-increased masterbatch a with polyester to obtain spinning melt a containing 12 wt% of coated and modified functional particle a;

[0241] The preparation process of the spinning melt b is as follows: First, nylon 6 and the coated and modified functional particles b are melt-blended to obtain the masterbatch b with a concentration of 55 wt%. Then, the masterbatch b and nylon 6 are melt-blended to obtain the spinning melt b containing 12 wt% of the coated and modified functional particles b;

[0242] (4) Prepare yarn A and yarn B respectively;

[0243] The preparation process of yarn A is as follows: Directly spin the spinning melt a according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain the fiber A with a specification of 100D / 72F. Then, weave the fiber A by using the high-density twill weaving method to obtain the yarn A with a linear density of 1.3 dtex, a warp density of 350 ends / 10 cm, a weft density of 200 ends / 10 cm, a warp tightness of 65%, and a weft tightness of 45%;

[0244] The preparation process of yarn B is as follows: Directly spin the spinning melt b according to the FDY process, and perform stretching with four pairs of stretching rollers during the spinning process to obtain the fiber B with a specification of 20D / 36F. Then, use a rib knitting machine with a change triangle to weave the fiber B in a composite manner of rib stitch and plain stitch to obtain the yarn B with a linear density of 0.6 dtex;

[0245] During the preparation processes of yarn A and yarn B, the temperature of the first pair of stretching rollers is 110 °C, the temperature of the second pair of stretching rollers is 145 °C, the temperature of the third pair of stretching rollers is 195 °C, and the temperature of the fourth pair of stretching rollers is 235 °C; the spinning speed of the first pair of stretching rollers is 500 m / min, the spinning speed of the second pair of stretching rollers is 1500 m / min, the spinning speed of the third pair of stretching rollers is 2600 m / min, and the spinning speed of the fourth pair of stretching rollers is 2800 m / min;

[0246] (5) Prepare a lightweight anti-permeable and quick-drying fabric for swimsuits;

[0247] Use yarn A as the outer yarn and yarn B as the inner yarn to weave into a fabric by weaving. After spraying lye on the outer surface of the fabric, place it in an infrared dyeing machine and heat it to 130 °C at a heating rate of 2 °C / min and keep it warm for 40 min to obtain the lightweight anti-permeable and quick-drying fabric for swimsuits; among them, the spraying amount of lye on the outer surface of the fabric is 28 mL / m 2 。

[0248] The water absorption rate of the finally obtained lightweight anti-permeable and quick-drying fabric for swimsuits is 161%, the water droplet diffusion time is 1.3 s, the wicking height is 119 mm, the drying rate is 0.49 g / h, and the anti-perspective index S is 97.9.

[0249] Comparative Example 4

[0250] A preparation method of a fabric is basically the same as that of Example 5, except that: in step (c), the D50 particle size of the coated and modified functional particle a is 40 nm.

[0251] The water absorption rate of the finally obtained fabric is 139%, the water droplet diffusion time is 3.3 s, the wicking height is 94 mm, the drying rate is 0.34 g / h, and the anti-transparency index S is 84.2.

[0252] Compared with Example 5, the moisture absorption and moisture conduction performance, quick-drying property and anti-transparency property of the fabric in Comparative Example 4 are significantly decreased. This is because the D50 particle size of the coated and modified functional particle a is too small, resulting in a decrease in the number of convex structures formed on the surface of fiber A and less dense distribution. It is difficult to form enough and effective grooves on the surface of fiber A, and it is also difficult to form a large number of capillary-like channels conducive to rapid water conduction between different fiber As, thereby affecting the rapid spreading and conduction of water on the surface of fiber A, making the moisture absorption and moisture conduction performance of the fabric poor and unable to achieve an efficient quick-drying function. At the same time, the decrease in the number of convex structures and less dense distribution also weaken the light scattering effect of the fabric, making it difficult to achieve a good anti-transparency effect by the light scattering of functional particle a itself. Moreover, since yarn A is the outer yarn of the fabric, the anti-transparency property of the fabric is also significantly decreased.

[0253] Comparative Example 5

[0254] A preparation method of a fabric is basically the same as that of Example 5, except that: in step (4), the spinning speeds of the fourth pair of drafting rollers are all 2600 m / min.

[0255] The water absorption rate of the finally obtained fabric is 93%, the water droplet diffusion time is 6.2 s, the wicking height is 75 mm, the drying rate is 0.18 g / h, and the anti-transparency index S is 71.6.

[0256] Compared with Example 5, the moisture absorption and moisture conduction performance, quick-drying property and anti-transparency property of the fabric in Comparative Example 5 are significantly decreased. This is because there is insufficient drafting in Comparative Example 5, resulting in a decrease in the number of convex structures formed on the surface of the fibers (fiber A and fiber B) and less dense distribution. It is difficult to form enough and effective grooves on the fiber surface, and it is also difficult to form a large number of capillary-like channels conducive to rapid water conduction between different fibers, thereby affecting the rapid spreading and conduction of water on the fiber surface, making the moisture absorption and moisture conduction performance of the fabric poor and unable to achieve an efficient quick-drying function. At the same time, the decrease in the number of convex structures and less dense distribution also weaken the light scattering effect of the fabric, making it difficult to achieve a good anti-transparency effect by the light scattering of functional particle a or functional particle b itself. Therefore, the anti-transparency property of the fabric is also significantly decreased.

Claims

1. A method for preparing a thin and light anti-permeability quick-drying fabric for swimwear, characterized in that: Fiber A and fiber B are prepared respectively, fiber A is spun into yarn A, fiber B is spun into yarn B, yarn A is used as an outer yarn and yarn B is used as an inner yarn to weave into a fabric by shuttle weaving, and the outer layer of the fabric is alkali-etched to obtain a light and thin anti-permeability quick-drying fabric for swimwear; The preparation process of fiber A and fiber B is as follows: spinning a spinning melt containing 8-15wt% of coated modified functional particles, and performing a draft of 5.6-6.5 times during the spinning process; 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 thereof by 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 preparation method of the coated modified functional particles is: firstly, a coupling agent is used to organically modify the functional particles to obtain coupling agent modified functional particles, and oligomers are prepared at the same time, and then the oligomers and the coupling agent modified functional particles are mixed and reacted; The functional particles corresponding to fiber A are titanium dioxide, the coupling agent is a mixture of fluorine-free silane and fluorine-containing silane, and the matrix of the spinning melt is polyester; the functional particles corresponding to fiber B are silicon dioxide, titanium dioxide or zinc oxide, and the matrix of the spinning melt is nylon 6; The preparation process of the spinning melt corresponding to fiber A is as follows: firstly, polyester and coated modified functional particles are melt-blended to obtain a masterbatch, then the masterbatch is solid-phase thickened, and then the masterbatch after solid-phase thickening is melt-blended with polyester to obtain a spinning melt; The alkaline etching treatment of the outer layer of the fabric refers to: spraying an alkaline solution on the outer surface of the fabric by spraying, and then heat treating the fabric.

2. The method for preparing a thin and light anti-permeability quick-drying fabric for swimwear according to claim 1, characterized in that: In the coupling agent corresponding to fiber A, the mass ratio of fluorine-free silane to fluorine-containing silane is 1:1-5, the fluorine-free silane is γ-aminopropyltriethoxysilane, and the fluorine-containing silane is tridecafluorooctyltrimethoxysilane or perfluorodecyltrimethoxysilane.

3. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 2, characterized in that: The mass of the coupling agent is 3-5% of the mass of the functional particles; 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 hours.

4. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 3, characterized in that: The preparation steps of the coated modified functional particles corresponding to fiber A 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; (c) adding the coupling agent modified functional particles to the reaction system of step (b), stirring 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; The preparation steps of the coated modified functional particles corresponding to fiber B are as follows: (I) using a coupling agent to organically modify the functional particles to obtain coupling agent-modified functional particles; (II) Add dibasic acid, diamine and deionized water into a reactor, replace the air in the reactor with nitrogen or inert gas, react at 250°C and 1.3-1.8MPa for 3h, then reduce the pressure to 0.1MPa, add a catalyst, raise the temperature to 260°C, turn on the vacuum pump, keep the vacuum degree below 80Pa, react for 2-3h, then increase the pressure to 0.1MPa, and reduce the temperature to 220°C to obtain an oligomer; (III) Add the coupling agent modified functional particles to the reaction system of step (II), stir to fully mix, keep the temperature to react for 0.5 to 1 hour, continue to evacuate, discharge, cool, pre-crush, and air flow crush to obtain coated modified functional particles.

5. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 1, characterized in that: During the preparation of the spinning melt corresponding to fiber A, the concentration of the masterbatch was 50-65 wt%, and the solid phase viscosity enhancement was carried out under nitrogen or inert gas atmosphere at a temperature of 190-210 °C for 20-30 h; The preparation process of the spinning melt corresponding to fiber B is as follows: firstly, nylon 6 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 nylon 6 to obtain a spinning melt; 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; Spinning is carried out directly according to the FDY process.

6. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 1, characterized in that: The specification of fiber A is 75~100D / 48~72F, the specification of fiber B is 20~50D / 36~72F, the linear density of yarn A is 1.3~1.6dtex, and the linear density of yarn B is 0.6~1.0dtex.

7. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 1, characterized in that: Yarn A is woven using a high-density twill weave method, with a warp density of 310~380 strands / 10cm, a weft density of 190~260 strands / 10cm, a warp tightness of 65%~75%, and a weft tightness of 45%~50%; yarn B is woven using a rib knitting machine with a changing triangle, in a composite manner of rib weave and plain weave.

8. The method for preparing a light and thin anti-permeability quick-drying fabric for swimwear according to claim 1, characterized in that: The amount of alkali solution sprayed on the outer surface of the fabric is 20~30mL / m 2 The alkali solution is composed of NaOH, ethanol and water, the concentration of NaOH is 6g / L, and the concentration of ethanol is 3mL / L; the heat treatment refers to: heating to 130℃ at a heating rate of 2℃ / min in an infrared dyeing machine and then keeping warm for 40min.

9. A method for preparing a thin and light anti-permeability quick-drying fabric for swimwear according to any one of claims 1 to 8, characterized in that: The water absorption rate of the thin and light anti-transmission and quick-drying fabric for swimsuits shall be ≥150%, the water droplet diffusion time shall be ≤2s, the wicking height shall be ≥110mm, the drying rate shall be ≥0.4g / h, and the anti-transmission index S>97.