Super-hydrophobic self-cleaning dirt-repellent flannel fabric and preparation method thereof

Abstract

The invention discloses a super-hydrophobic self-cleaning dirt-repellent flannel fabric and a preparation method thereof, and relates to the technical field of flannel fabrics, and the preparation method comprises the following steps: preparing nano self-expanding fibers, first hydrophobic fibers and second hydrophobic fibers, taking the nano self-expanding fibers to coat the first hydrophobic fibers and the second hydrophobic fibers to obtain composite yarns, and preparing the super-hydrophobic self-cleaning dirt-repellent flannel fabric. Preparing nano self-expanding yarns, performing cross weaving on the yarns to obtain base cloth, and forming a fluff layer on the top of the base cloth. According to the flannel fabric, by arranging the yarn fibers with two super-hydrophobic degrees, the super-hydrophobic degree of the flannel fabric can be adjusted, when stains adhere to the surface of the flannel fabric, the second hydrophobic fibers leak out, the super-hydrophobicity of the flannel fabric at the stains is lower than the super-hydrophobicity of other positions, and when the surface of the fabric is flushed by water drops, the flannel fabric has the super-hydrophobic effect. The water drops tend to the position in the rolling process, so that more water drops easily pass through the stain position, the stain position can be effectively cleaned conveniently, and the self-cleaning capability of the fabric is realized.

Description

Technical Field

[0001] This invention relates to the field of flannel fabric technology, specifically to a superhydrophobic, self-cleaning, stain-repellent flannel fabric and its preparation method. Background Technology

[0002] Flannel is a soft, napped (cotton) wool fabric woven from coarse (cotton) wool yarn. It is produced by blending cotton or wool fibers into mixed-color yarn, weaving the fabric, and then performing a fulling and napping process to give it a napped surface and good insulation properties. However, existing flannel fabrics have poor water repellency and are prone to attracting and retaining stains, thus reducing the user experience.

[0003] The existing defects of flannel fabric are:

[0004] 1. Patent document CN110747567B mainly considers how to improve the elasticity and wrinkle resistance of flannel fabric, but does not consider how to improve the hydrophobicity and self-cleaning and stain-resistant properties of flannel fabric.

[0005] 2. Patent document CN104562715B mainly considers how to improve the heat insulation and softness of flannel fabric, but does not consider how to further improve the hydrophobic and waterproof properties of flannel fabric.

[0006] 3. Patent document CN110144730B mainly considers how to make flannel fabric have a fragrance effect, but does not consider how to improve the expansion effect and temperature sensitivity of nano self-expanding fibers. Summary of the Invention

[0007] The purpose of this invention is to provide a superhydrophobic, self-cleaning, stain-repellent flannel fabric and its preparation method, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric, comprising the following steps:

[0009] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0010] The composite yarn is obtained by coating the first and second hydrophobic fibers with nano-self-expanding fibers, followed by roving and spinning processes.

[0011] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0012] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric.

[0013] The top of the base fabric is treated with napping, shearing, and combing to form a pile layer on top of the base fabric.

[0014] Preferably, the mass ratio of the first hydrophobic fiber to the second hydrophobic fiber in the composite yarn is 1:1.

[0015] Preferably, when the nano-self-expanding fibers are used to coat the first hydrophobic fiber and the second hydrophobic fiber, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second hydrophobic fiber and the first hydrophobic fiber is (3-5):1.

[0016] Preferably, during the weaving process of the base fabric, the density ratio of the first warp and the second warp is (2-5):1.

[0017] Preferably, the preparation of the first hydrophobic fiber includes the following steps:

[0018] Cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is (3~8):(2~5):(2~4);

[0019] The composite fibers are cleaned with deionized water, and then removed and dried.

[0020] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance includes at least one of octadecyltrimethoxysilane, octadecyltriethoxysilane, and tridecafluorooctyltriethoxysilane. The solvent includes one of isoacetone and ethanol. The mass ratio of the first hydrophobic substance to the solution in the first modified solution is (1-3):100.

[0021] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked for 1 to 1.5 hours at 24 to 55°C.

[0022] After impregnation, the first modified fiber is obtained and then baked at 85-110℃ for 10-15 minutes.

[0023] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0024] Preferably, the preparation of the second hydrophobic fiber includes the following steps:

[0025] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing treatment. The second hydrophobic substance includes at least one of dodecyltrimethoxysilane and methyltriethoxysilane, and the solvent includes one of isoacetone and ethanol. The mass ratio of the second hydrophobic substance to the solution in the second modified solution is (1-3):100.

[0026] The other half of the cleaned and dried composite fiber is immersed in the second modification solution and impregnated at 24-40°C for 0.5-1 hour.

[0027] After impregnation, the second modified fiber is obtained and then baked at 65-85℃ for 10-15 minutes.

[0028] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0029] Preferably, the preparation of the self-expanding nanofibers includes the following steps:

[0030] Acrylonitrile and polyethylene terephthalate are mixed to obtain a mixed resin matrix;

[0031] The mixed resin matrix was hydrophobically modified using a silane coupling agent, and the modified mixed resin matrix was obtained after cleaning and drying.

[0032] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder includes at least one of expanded graphite or expanded carbon nanotubes;

[0033] The converted particles are added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles include at least one of strontium titanate, titanium dioxide, and titanium trioxide;

[0034] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano self-expanding fibers is 1:(1~4).

[0035] Preferably, the thermally expanding microspheres in the self-expanding nanofibers further include the following steps:

[0036] Isopentane was added to the thermally expandable powder and mixed evenly to obtain the core of the thermally expandable microspheres;

[0037] Low-temperature plasma surface activation treatment was performed on the surface of thermally expandable microspheres;

[0038] A micron-sized thermally conductive coating is applied to the surface of the thermal microspheres after surface activation treatment.

[0039] Preferably, the micron-sized thermally conductive coating comprises an alumina micron-sized coating or a copper oxide micron-sized coating.

[0040] A superhydrophobic, self-cleaning, stain-repellent flannel fabric is prepared using the aforementioned method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1. This invention modifies composite fibers using different substances to obtain two superhydrophobic fibers with different hydrophobic properties, and prepares nano-self-expanding fibers to coat the two superhydrophobic fibers into yarn for fabric preparation. This allows the yarn to simultaneously possess two different degrees of superhydrophobicity, thereby enabling the flannel fabric to adjust its superhydrophobicity. When the flannel fabric is clean, the nano-self-expanding fibers are in an expanded state, completely coating the outer wall of the second hydrophobic fiber and equidistantly coating the first hydrophobic fiber. When stains adhere to the surface of the flannel fabric, the stains block the underlying nano-self-expanding fibers, thus... Compared to other areas, the flannel fabric in this location receives less light. Under the influence of the transforming particles, the temperature of the nano-self-expanding fibers in the stained area is lower than that in other areas. This causes the nano-self-expanding fibers in the stained area to shrink, preventing them from completely covering the secondary hydrophobic fibers with weaker superhydrophobic properties. Consequently, the superhydrophobicity of the flannel fabric in the stained area is lower than that in other areas. When water droplets hit the fabric surface, the water droplets tend to roll towards this location, allowing more water droplets to pass through the stained area, facilitating effective cleaning of the stain and enabling the fabric to achieve self-cleaning capabilities.

[0043] 2. This invention, by adding nano-self-expanding fibers during the flannel fabric weaving process, can change the microstructure of the flannel fabric, creating a raised structure in the microstructure, thereby increasing the roughness of the flannel fabric and improving its superhydrophobic and waterproof properties.

[0044] 3. This invention prepares the core of thermally expandable microspheres by mixing expanded powder with isopentane, which helps to reduce the expansion temperature of the thermally expandable microspheres, facilitating the expansion of the nano-self-expanding fibers, thereby improving the roughness of the flannel fabric. Low-temperature plasma surface activation treatment of the thermally expandable microspheres enhances their temperature sensitivity, facilitating the location of stains on the fabric surface and enabling effective cleaning. Coating the surface of the thermally expandable microspheres with a micron-sized thermally conductive coating improves the thermal conductivity of the microsphere shell, further enhancing the temperature sensitivity of the nano-self-expanding fibers.

[0045] 4. The present invention uses a continuous coating method to coat the surfaces of the first and second hydrophobic fibers, so that the first and second hydrophobic fibers have nanopores, which is beneficial to improve the breathability of the fabric, and the hydrophobic effect of the flannel fabric is maintained under the coating of nano self-expanding fibers with superhydrophobic effect. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0048] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0049] The first and second hydrophobic fibers are coated with nano-self-expanding fibers, and then roving and spinning processes are carried out to obtain composite yarn.

[0050] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0051] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric.

[0052] The top of the base fabric is treated with napping, shearing, and combing to form a pile layer on top of the base fabric.

[0053] Example 1,

[0054] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0055] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0056] The preparation of the first hydrophobic fiber includes the following steps: cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2.

[0057] The composite fibers are cleaned with deionized water, and then removed and dried.

[0058] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance is a mixture of octadecyltrimethoxysilane and octadecyltriethoxysilane, and the mass ratio of octadecyltrimethoxysilane to octadecyltriethoxysilane is 1:1. The solvent is isoacetone, and the mass ratio of the first hydrophobic substance to the solution in the first modified solution is 1:100.

[0059] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked at 50°C for 1 hour.

[0060] After impregnation, the first modified fiber was obtained and then baked at 100°C for 10 minutes.

[0061] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0062] The preparation of the second hydrophobic fiber includes the following steps:

[0063] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing. The second hydrophobic substance is dodecyltrimethoxysilane, the solvent is isoacetone, and the mass ratio of the second hydrophobic substance to the solution in the second modified solution is 2:100.

[0064] The other half of the cleaned and dried composite fiber was immersed in the second modification solution and impregnated at 35°C for 0.6 hours.

[0065] After impregnation, the second modified fiber was obtained and then baked at 80°C for 10 minutes.

[0066] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0067] The preparation of the self-expanding nanofibers includes the following steps:

[0068] Acrylonitrile and polyethylene terephthalate were mixed to obtain a mixed resin matrix, and the mass ratio of acrylonitrile to polyethylene terephthalate in the mixed resin matrix was 5:3.

[0069] The mixed resin matrix was hydrophobically modified using a silane coupling agent. After washing and drying, the modified mixed resin matrix was obtained. The silane coupling agent used was 3-aminopropyltriethoxysilane, and the amount of silane coupling agent was 2% of the mass of the mixed resin matrix to be treated.

[0070] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder is expanded carbon nanotubes, and the preparation of the expanded microspheres includes the following steps:

[0071] Isopentane was added to the thermally expandable powder and mixed thoroughly to obtain the core of the thermally expandable microspheres, with isopentane accounting for 3% of the total weight of the core.

[0072] The thermally expandable microspheres are prepared by emulsion polymerization or spray drying. For example, the preparation process of thermally expandable microspheres by emulsion polymerization is as follows: water, dispersant, and stabilizer are mixed to prepare an aqueous solution. The dispersant is silica, and the stabilizer is polyvinylpyrrolidone. The amount of dispersant added is 5% of the total mass of the aqueous solution, and the amount of stabilizer added is 5% of the total mass of the aqueous solution.

[0073] A shell material, crosslinking agent, initiator, and thermally expandable microsphere core were mixed to prepare an oil-phase emulsion. The raw materials and their mass percentages in the shell material were as follows: styrene:butadiene:butyl acrylate:EVA:polyurethane = 40%:25%:15%:10%:10%. The crosslinking agent was p-divinylbenzene, and the initiator was benzoyl peroxide. The amount of crosslinking agent added to the oil-phase emulsion was 1.5% of the total mass of the oil-phase solution, the amount of initiator added was 2.5% of the total mass of the oil-phase solution, and the amount of thermally expandable microsphere core was 42% of the total mass of the oil-phase solution.

[0074] Aqueous and oil solutions were blended and polymerized at 75°C to obtain thermally expandable microspheres.

[0075] For thermal expansion microsphere primary bodies, low-temperature plasma surface activation treatment is beneficial to improving the outer shell surface structure of the thermal expansion microsphere primary bodies, which to a certain extent helps to improve the thermal conductivity of the shell layer.

[0076] For the primary thermally expandable microspheres after surface activation treatment, a micron-sized thermally conductive coating is coated on its surface. The micron-sized thermally conductive coating is an alumina coating. After drying, thermally expandable microspheres are formed. By setting the micron-sized thermally conductive coating, it is beneficial to improve the thermal conductivity and thermal conductivity efficiency of the thermally expandable microspheres.

[0077] The converted particles were added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles included strontium titanate and titanium dioxide, and the mass ratio of strontium titanate to titanium dioxide was 3:5.

[0078] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano-self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano-self-expanding fibers is 1:4.

[0079] The composite yarn is obtained by coating the first and second hydrophobic fibers with nano-self-expanding fibers, followed by roving and spinning processes.

[0080] When the nano-self-expanding fibers coat the first and second hydrophobic fibers, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second and first hydrophobic fibers is 3:1.

[0081] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0082] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric. During the interwoven process, the first warp and second warp are rotated 45° clockwise in the direction of the horizontal straight line, and the weft is rotated 45° counterclockwise in the direction of the horizontal straight line.

[0083] During the base fabric weaving process, the density ratio of the first warp and the second warp is 3:1.

[0084] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0085] Furthermore, by using composite fibers to prepare composite yarns, and then preparing the first warp and weft yarns, the flannel fabric is made to have skin-friendly and soft properties while also having good elasticity and abrasion resistance, thus improving the durability of the flannel fabric. By modifying the composite fibers, the first hydrophobic fiber and the second hydrophobic fiber are obtained, and then two hydrophobic yarns with different hydrophobic abilities are obtained as the first warp and the second warp, respectively. This allows the yarns used to weave the flannel fabric to have good hydrophobic properties and also have the function of automatically adjusting the hydrophobic ability, giving the flannel fabric a certain degree of intelligence. Moreover, during the preparation of the nano self-expanding fiber, conversion particles are added to the shell substrate, which can realize the conversion of light energy into heat energy, thereby keeping the thermal expansion microspheres in an expanded state, thus obtaining the expanded nano self-expanding fiber.

[0086] Example 2,

[0087] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0088] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0089] The preparation of the first hydrophobic fiber includes the following steps: cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2.

[0090] The composite fibers are cleaned with deionized water, and then removed and dried.

[0091] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance is a mixture of octadecyltrimethoxysilane and octadecyltriethoxysilane, and the mass ratio of octadecyltrimethoxysilane to octadecyltriethoxysilane is 1:1. The solvent is isoacetone, and the mass ratio of the first hydrophobic substance to the solution in the first modified solution is 2:100.

[0092] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked at 50°C for 1 hour.

[0093] After impregnation, the first modified fiber was obtained and then baked at 100°C for 10 minutes.

[0094] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0095] The preparation of the second hydrophobic fiber includes the following steps:

[0096] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing. The second hydrophobic substance is dodecyltrimethoxysilane, the solvent is isoacetone, and the mass ratio of the second hydrophobic substance to the solution in the second modified solution is 2:100.

[0097] The other half of the cleaned and dried composite fiber was immersed in the second modification solution and impregnated at 35°C for 0.6 hours.

[0098] After impregnation, the second modified fiber was obtained and then baked at 80°C for 10 minutes.

[0099] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0100] The preparation of the self-expanding nanofibers includes the following steps:

[0101] Acrylonitrile and polyethylene terephthalate were mixed to obtain a mixed resin matrix, and the mass ratio of acrylonitrile to polyethylene terephthalate in the mixed resin matrix was 5:3.

[0102] The mixed resin matrix was hydrophobically modified using a silane coupling agent. After washing and drying, the modified mixed resin matrix was obtained. The silane coupling agent used was 3-aminopropyltriethoxysilane, and the amount of silane coupling agent was 2% of the mass of the mixed resin matrix to be treated.

[0103] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder is expanded carbon nanotubes, and the preparation of the expanded microspheres includes the following steps:

[0104] Isopentane was added to the thermally expandable powder and mixed thoroughly to obtain the core of the thermally expandable microspheres, with isopentane accounting for 3% of the total weight of the core.

[0105] The primary thermally expandable microspheres were prepared by emulsion polymerization, and the preparation steps were the same as those in Example 1.

[0106] For thermal expansion microsphere primary bodies, low-temperature plasma surface activation treatment is beneficial to improving the outer shell surface structure of the thermal expansion microsphere primary bodies, which to a certain extent helps to improve the thermal conductivity of the shell layer.

[0107] For the primary thermally expandable microspheres after surface activation treatment, a micron-sized thermally conductive coating is coated on its surface. The micron-sized thermally conductive coating is an alumina coating. After drying, thermally expandable microspheres are formed. By setting the micron-sized thermally conductive coating, it is beneficial to improve the thermal conductivity and thermal conductivity efficiency of the thermally expandable microspheres.

[0108] The converted particles were added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles included strontium titanate and titanium dioxide, and the mass ratio of strontium titanate to titanium dioxide was 3:5.

[0109] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano-self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano-self-expanding fibers is 1:4.

[0110] The first and second hydrophobic fibers are coated with nano-self-expanding fibers, and then roving and spinning processes are carried out to obtain composite yarn.

[0111] When the nano-self-expanding fibers coat the first and second hydrophobic fibers, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second and first hydrophobic fibers is 3:1.

[0112] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0113] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric. The interwoven method of the first warp, second warp and weft is the same as that in Example 1.

[0114] During the base fabric weaving process, the density ratio of the first warp and the second warp is 3:1.

[0115] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0116] By setting the first warp, second warp, and weft threads of the base fabric to be inclined during the weaving process, the resulting base fabric has a diagonal weave. This reduces the resistance of the fabric weave to water droplets, allowing water droplets to roll off quickly and reducing the contact time between water droplets and the fabric surface. This lowers the risk of water seeping into the fabric and improves the hydrophobic effect of the flannel fabric to some extent.

[0117] Example 3,

[0118] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0119] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0120] The preparation of the first hydrophobic fiber includes the following steps: cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2.

[0121] The composite fibers are cleaned with deionized water, and then removed and dried.

[0122] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance is tridecafluorooctyltriethoxysilane, the solvent is ethanol, and the mass ratio of the first hydrophobic substance to the solution in the first modified solution is 1:100.

[0123] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked at 50°C for 1 hour.

[0124] After impregnation, the first modified fiber was obtained and then baked at 100°C for 10 minutes.

[0125] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0126] The preparation of the second hydrophobic fiber includes the following steps:

[0127] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing. The second hydrophobic substance is methyltriethoxysilane, the solvent is isoacetone, and the mass ratio of the second hydrophobic substance to the solution in the second modified solution is 2:100.

[0128] The other half of the cleaned and dried composite fiber was immersed in the second modification solution and impregnated at 35°C for 0.6 hours.

[0129] After impregnation, the second modified fiber was obtained and then baked at 80°C for 10 minutes.

[0130] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0131] The preparation of the self-expanding nanofibers includes the following steps:

[0132] Acrylonitrile and polyethylene terephthalate were mixed to obtain a mixed resin matrix, and the mass ratio of acrylonitrile to polyethylene terephthalate in the mixed resin matrix was 5:3.

[0133] The mixed resin matrix was hydrophobically modified using a silane coupling agent. After washing and drying, the modified mixed resin matrix was obtained. The silane coupling agent used was 3-aminopropyltriethoxysilane-methyltriethoxysilane, and the amount of silane coupling agent was 2% of the mass of the mixed resin matrix to be treated.

[0134] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder is expanded carbon nanotubes, and the preparation of the expanded microspheres includes the following steps:

[0135] Isopentane was added to the thermally expandable powder and mixed thoroughly to obtain the core of the thermally expandable microspheres, with isopentane accounting for 3% of the total weight of the core.

[0136] The primary thermally expandable microspheres were prepared by emulsion polymerization, and the preparation steps were the same as those in Example 1.

[0137] For thermal expansion microsphere primary bodies, low-temperature plasma surface activation treatment is beneficial to improving the outer shell surface structure of the thermal expansion microsphere primary bodies, which to a certain extent helps to improve the thermal conductivity of the shell layer.

[0138] For the primary thermally expandable microspheres after surface activation treatment, a micron-sized thermally conductive coating is coated on its surface. The micron-sized thermally conductive coating is an alumina coating. After drying, thermally expandable microspheres are formed. By setting the micron-sized thermally conductive coating, it is beneficial to improve the thermal conductivity and thermal conductivity efficiency of the thermally expandable microspheres.

[0139] The converted particles were added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles included strontium titanate and titanium dioxide, and the mass ratio of strontium titanate to titanium dioxide was 3:5.

[0140] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano-self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano-self-expanding fibers is 1:4.

[0141] The composite yarn is obtained by coating the first and second hydrophobic fibers with nano-self-expanding fibers, followed by roving and spinning processes.

[0142] When the nano-self-expanding fibers coat the first and second hydrophobic fibers, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second and first hydrophobic fibers is 3:1.

[0143] By arranging the first and second hydrophobic fibers side by side, and wrapping and winding the first and second hydrophobic fibers with nano-self-expanding fibers, a yarn with differential hydrophobic capabilities is formed. This allows the flannel fabric woven with this yarn to have adjustable hydrophobic capabilities, thereby enabling the flannel fabric to achieve self-cleaning capabilities.

[0144] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0145] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric.

[0146] During the base fabric weaving process, the density ratio of the first warp and the second warp is 3:1.

[0147] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0148] Example 4,

[0149] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0150] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0151] The preparation of the first hydrophobic fiber includes the following steps: cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2.

[0152] The composite fibers are cleaned with deionized water, and then removed and dried.

[0153] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance is a mixture of octadecyltrimethoxysilane and octadecyltriethoxysilane, and the mass ratio of octadecyltrimethoxysilane to octadecyltriethoxysilane is 1:1. The solvent is isoacetone, and the mass ratio of the first hydrophobic substance to the solution in the first modified solution is 1:100.

[0154] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked at 50°C for 1 hour.

[0155] After impregnation, the first modified fiber was obtained and then baked at 100°C for 10 minutes.

[0156] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0157] The preparation of the second hydrophobic fiber includes the following steps:

[0158] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing. The second hydrophobic substance is dodecyltrimethoxysilane, the solvent is isoacetone, and the mass ratio of the second hydrophobic substance to the solution in the second modified solution is 2:100.

[0159] The other half of the cleaned and dried composite fiber was immersed in the second modification solution and impregnated at 35°C for 0.6 hours.

[0160] After impregnation, the second modified fiber was obtained and then baked at 80°C for 10 minutes.

[0161] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0162] The preparation of the self-expanding nanofibers includes the following steps:

[0163] Acrylonitrile and polyethylene terephthalate were mixed to obtain a mixed resin matrix, and the mass ratio of acrylonitrile to polyethylene terephthalate in the mixed resin matrix was 5:3.

[0164] The mixed resin matrix was hydrophobically modified using a silane coupling agent. After washing and drying, the modified mixed resin matrix was obtained. The silane coupling agent used was 3-aminopropyltriethoxysilane, and the amount of silane coupling agent was 2% of the mass of the mixed resin matrix to be treated.

[0165] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder is expanded carbon nanotubes, and the preparation of the expanded microspheres includes the following steps:

[0166] Isopentane was added to the thermally expandable powder and mixed thoroughly to obtain the core of the thermally expandable microspheres, with isopentane accounting for 3% of the total weight of the core.

[0167] The primary thermally expandable microspheres were prepared by emulsion polymerization, and the preparation steps were the same as those in Example 1.

[0168] For thermal expansion microsphere primary bodies, low-temperature plasma surface activation treatment is beneficial to improving the outer shell surface structure of the thermal expansion microsphere primary bodies, which to a certain extent helps to improve the thermal conductivity of the shell layer.

[0169] For the primary thermally expandable microspheres after surface activation treatment, a micron-sized thermally conductive coating is coated on its surface. The micron-sized thermally conductive coating is an alumina coating. After drying, thermally expandable microspheres are formed. By setting the micron-sized thermally conductive coating, it is beneficial to improve the thermal conductivity and thermal conductivity efficiency of the thermally expandable microspheres.

[0170] The converted particles were added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles included strontium titanate and titanium dioxide, and the mass ratio of strontium titanate to titanium dioxide was 3:5.

[0171] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano-self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano-self-expanding fibers is 1:4.

[0172] The first and second hydrophobic fibers are coated with nano-self-expanding fibers, and then roving and spinning processes are carried out to obtain composite yarn.

[0173] When the nano-self-expanding fibers coat the first and second hydrophobic fibers, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second and first hydrophobic fibers is 5:1.

[0174] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0175] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric.

[0176] During the base fabric weaving process, the density ratio of the first warp and the second warp is 5:1.

[0177] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0178] Example 5,

[0179] A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric includes the following steps:

[0180] Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber;

[0181] The preparation of the first hydrophobic fiber includes the following steps: cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2.

[0182] The composite fibers are cleaned with deionized water, and then removed and dried.

[0183] A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance is a mixture of octadecyltrimethoxysilane and octadecyltriethoxysilane, and the mass ratio of octadecyltrimethoxysilane to octadecyltriethoxysilane is 1:1. The solvent is isoacetone, and the mass ratio of the first hydrophobic substance to the solution in the first modified solution is 1:100.

[0184] Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked at 50°C for 1 hour.

[0185] After impregnation, the first modified fiber was obtained and then baked at 100°C for 10 minutes.

[0186] The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

[0187] The preparation of the second hydrophobic fiber includes the following steps:

[0188] The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing. The second hydrophobic substance is dodecyltrimethoxysilane, the solvent is isoacetone, and the mass ratio of the second hydrophobic substance to the solution in the second modified solution is 2:100.

[0189] The other half of the cleaned and dried composite fiber was immersed in the second modification solution and impregnated at 35°C for 0.6 hours.

[0190] After impregnation, the second modified fiber was obtained and then baked at 80°C for 10 minutes.

[0191] The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

[0192] The preparation of the self-expanding nanofibers includes the following steps:

[0193] Acrylonitrile and polyethylene terephthalate were mixed to obtain a mixed resin matrix, and the mass ratio of acrylonitrile to polyethylene terephthalate in the mixed resin matrix was 5:3.

[0194] The mixed resin matrix was hydrophobically modified using a silane coupling agent. After washing and drying, the modified mixed resin matrix was obtained. The silane coupling agent used was 3-aminopropyltriethoxysilane, and the amount of silane coupling agent was 2% of the mass of the mixed resin matrix to be treated.

[0195] Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder is expanded carbon nanotubes, and the preparation of the expanded microspheres includes the following steps:

[0196] Isopentane was added to the thermally expandable powder and mixed thoroughly to obtain the core of the thermally expandable microspheres, with isopentane accounting for 3% of the total weight of the core.

[0197] The primary thermally expandable microspheres were prepared by emulsion polymerization, and the preparation steps were the same as those in Example 1.

[0198] For thermal expansion microsphere primary bodies, low-temperature plasma surface activation treatment is beneficial to improving the outer shell surface structure of the thermal expansion microsphere primary bodies, which to a certain extent helps to improve the thermal conductivity of the shell layer.

[0199] For the primary thermally expandable microspheres after surface activation treatment, a micron-sized thermally conductive coating is coated on its surface. The micron-sized thermally conductive coating is an alumina coating. After drying, thermally expandable microspheres are formed. By setting the micron-sized thermally conductive coating, it is beneficial to improve the thermal conductivity and thermal conductivity efficiency of the thermally expandable microspheres.

[0200] The converted particles were added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles included strontium titanate and titanium dioxide, and the mass ratio of strontium titanate to titanium dioxide was 3:5.

[0201] The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano-self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano-self-expanding fibers is 1:2.

[0202] The first and second hydrophobic fibers are coated with nano-self-expanding fibers, and then roving and spinning processes are carried out to obtain composite yarn.

[0203] When the nano-self-expanding fibers coat the first and second hydrophobic fibers, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second and first hydrophobic fibers is 5:1.

[0204] Nano self-expanding fibers are twisted to obtain nano self-expanding yarn;

[0205] Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric.

[0206] During the base fabric weaving process, the density ratio of the first warp and the second warp is 3:1.

[0207] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0208] Comparative Example 1,

[0209] A method for preparing flannel fabric includes the following steps:

[0210] Cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is 5:2:2;

[0211] The composite fibers are cleaned with deionized water, and then removed and dried.

[0212] A composite fiber modification solution was prepared by dissolving dodecyltrimethoxysilane in isoacetone. The mass ratio of dodecyltrimethoxysilane to the solution in the composite fiber modification solution was 2:100.

[0213] The modified composite fibers are used as warp and weft threads, and the base fabric is woven using a cross-weaving method.

[0214] The top of the base fabric is raised, sheared, and combed to form a pile layer on top of the base fabric. The pile length in the pile layer is 3mm. The pile layer is then heat-set, and the tips of the pile in the heat-set pile layer are tilted downwards to facilitate water droplets rolling off.

[0215] Flannel fabric samples were obtained from the flannel fabrics prepared in Example 1 to Comparative Example 1, and the size of the flannel fabric samples was 200mm*350mm.

[0216] The contact angle between water droplets and the fabric surface of flannel fabric specimens was determined in accordance with GB / T30693-2014 "Determination of Contact Angle of Textile Surface". Specifically, a static water contact angle tester was used to perform the static water contact angle test. The water volume was 5 μL each time. The reading was taken 30 seconds after the water droplet came into contact with the fabric. Five measurements were taken at different positions on the same sample, and the average value was taken.

[0217] The water droplet rolling angle test was conducted on the flannel fabric specimen. The specific method was to fix the flannel fabric specimen on an angle-adjustable platform, and add the same number of water droplets at the same position on the fabric specimen. The tilt angle was slowly adjusted, and the tilt angle of the platform when the water droplets started to roll was recorded.

[0218] To test the cleaning and stain removal capabilities of flannel fabric samples, an equal amount and area of ​​stain were evenly applied to the surface of the flannel sample. The weight of the flannel sample after staining was measured. The flannel sample was then rinsed with water at the same flow rate under the same conditions. After drying the fabric sample, it was weighed again. The difference between the two fabric sample weights was calculated. The stain removal rate was then calculated by dividing the difference between the two fabric sample weights by the total amount of stain applied and multiplying by 100%.

[0219] The test results are shown in the table below:

[0220] The test results show that the flannel fabric prepared using the method proposed in this application has a higher contact angle than the flannel fabric prepared in Comparative Example 1, thus giving the flannel fabric superhydrophobic properties. The test results of Examples 1 and 3 show that modifying the composite fibers with long-chain alkylsilanes increases the contact angle of the flannel fabric, thereby improving its hydrophobicity. The test results of Examples 1, 4, and 5 show that setting an appropriate nano-self-expanding fiber winding ratio on the outer side of the first and second hydrophobic yarns, and setting an appropriate fiber outer layer thickness and thermal expansion microsphere filling amount for the self-expanding fibers, is beneficial for improving the hydrophobic properties of the flannel fabric and greatly enhancing its self-cleaning and stain-repellent properties.

[0221] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric, characterized in that: Includes the following steps: Prepare nano-self-expanding fibers, a first hydrophobic fiber, and a second hydrophobic fiber; The composite yarn is obtained by coating the first and second hydrophobic fibers with nano-self-expanding fibers, followed by roving and spinning processes. Nano self-expanding fibers are twisted to obtain nano self-expanding yarn; Composite yarns are used as the first warp and weft, and nano self-expanding yarn is used as the second warp. The first warp, second warp and weft are interwoven to obtain the base fabric. The top of the base fabric is treated with napping, shearing, and combing to form a pile layer on top of the base fabric.

2. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 1, characterized in that: The mass ratio of the first hydrophobic fiber to the second hydrophobic fiber in the composite yarn is 1:

1.

3. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 2, characterized in that: When the nano-self-expanding fibers are used to coat the first hydrophobic fiber and the second hydrophobic fiber, the ratio of the number of turns of the nano-self-expanding fibers on the surface of the second hydrophobic fiber and the first hydrophobic fiber is (3~5):

1.

4. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 1, characterized in that: During the weaving process of the base fabric, the density ratio of the first warp and the second warp is (2-5):

1.

5. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 2, characterized in that: The preparation of the first hydrophobic fiber includes the following steps: Cotton fiber, polyester fiber and spandex fiber are blended to obtain composite fiber, and the mass ratio of cotton fiber, polyester fiber and spandex fiber in the composite fiber is (3~8):(2~5):(2~4); The composite fibers are cleaned with deionized water, and then removed and dried. A first modified solution is prepared by dissolving a first hydrophobic substance in a solvent and then ultrasonically mixing the first modified solution. The first hydrophobic substance includes at least one of octadecyltrimethoxysilane, octadecyltriethoxysilane, and tridecafluorooctyltriethoxysilane. The solvent includes one of isoacetone and ethanol. The mass ratio of the first hydrophobic substance to the solution in the first modified solution is (1-3):

100. Half of the cleaned and dried composite fiber was immersed in the first modification solution and soaked for 1 to 1.5 hours at 24 to 55°C. After impregnation, the first modified fiber is obtained and then baked at 85-110℃ for 10-15 minutes. The first modified fiber was washed with deionized water, and then dried to obtain the first hydrophobic fiber.

6. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 2, characterized in that: The preparation of the second hydrophobic fiber includes the following steps: The second hydrophobic substance is dissolved in a solvent to prepare a second modified solution, and the second modified solution is subjected to ultrasonic mixing treatment. The second hydrophobic substance includes at least one of dodecyltrimethoxysilane and methyltriethoxysilane, and the solvent includes one of isoacetone and ethanol. The mass ratio of the second hydrophobic substance to the solution in the second modified solution is (1-3):

100. The other half of the cleaned and dried composite fiber is immersed in the second modification solution and impregnated at 24-40°C for 0.5-1 hour. After impregnation, the second modified fiber is obtained and then baked at 65-85℃ for 10-15 minutes. The second modified fiber was washed with deionized water, and then dried to obtain the second hydrophobic fiber.

7. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 1, characterized in that: The preparation of the self-expanding nanofibers includes the following steps: Acrylonitrile and polyethylene terephthalate are mixed to obtain a mixed resin matrix; The mixed resin matrix was hydrophobically modified using a silane coupling agent, and the modified mixed resin matrix was obtained after cleaning and drying. Thermally expandable microspheres are prepared from expanded powder, wherein the expanded powder includes at least one of expanded graphite or expanded carbon nanotubes; The converted particles are added to the modified mixed resin matrix and mixed evenly to obtain the shell substrate, wherein the converted particles include at least one of strontium titanate, titanium dioxide, and titanium trioxide; The shell substrate and thermally expanded microspheres are added together into a coaxial spinning machine for melt spinning to obtain nano self-expanding fibers. The ratio of the thickness of the shell substrate to the diameter of the nano self-expanding fibers is 1:(1~4).

8. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 7, characterized in that: The thermally expanding microspheres in the self-expanding nanofibers further include the following steps: Isopentane was added to the thermally expandable powder and mixed evenly to obtain the core of the thermally expandable microspheres; Low-temperature plasma surface activation treatment was performed on the surface of thermally expandable microspheres; A micron-sized thermally conductive coating is applied to the surface of the thermal microspheres after surface activation treatment.

9. The method for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric according to claim 8, characterized in that: The micron-sized thermally conductive coating includes an aluminum oxide micron-sized coating or a copper oxide micron-sized coating.

10. A superhydrophobic, self-cleaning, stain-repellent flannel fabric, characterized in that: The fabric is prepared using the method described in claim 1 for preparing a superhydrophobic, self-cleaning, stain-repellent flannel fabric.

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