Heat-storage cold-proof fabric and preparation method thereof

Abstract

The present invention discloses a heat-storage cold-proof fabric and a preparation method thereof. An inner layer fabric is obtained by weaving hollow wool fibers and Y-type nylon fibers, an outer layer fabric is obtained by mixing and spinning graphene nanosheets and polyester chips, and the outer layer fabric, a PU film and the inner layer fabric are hot-pressed and composited to obtain the heat-storage cold-proof fabric. A three-dimensional moisture-conducting network is constructed by hollow wool fibers and Y-type nylon fibers. The hollow structure forms internal microporous channels to accelerate water vapor transmission, and the branched morphology of the Y-type fibers greatly increases the contact area between the fibers and the air. The synergistic effect of the two enables sweat to diffuse quickly from the inner layer to the outer layer, effectively avoiding condensation accumulation. The improvement of moisture permeability is achieved by constructing physical moisture-conducting channels, and the softness of the fabric is maintained based on the movable arrangement of the wool fibers and the Y-type nylon, thereby solving the defects of the heat-storage cold-proof fabric in the prior art, such as poor moisture permeability and softness at low temperatures.

Description

Technical Field

[0001] The invention relates to the technical field of layered products, in particular to a layered product composed of polyester, and in particular to a heat-storage cold-proof fabric and a preparation method thereof. Background Art

[0002] Thermal insulation fabrics are textiles designed with specialized materials or structural designs to achieve efficient insulation and active heat storage. Their core function is to reduce heat loss from the human body and actively store or release heat. In skiing, mountaineering, hiking, and other equipment, thermal insulation fabrics quickly absorb heat generated by exercise and release it slowly, preventing sudden drops in body temperature.

[0003] In the prior art, membrane composite fabrics are usually used to make heat-storage and cold-proof fabrics. In the membrane composite fabrics, the PU film is located in the middle layer, the outer layer is usually made of polyester material, and the inner layer is usually made of nylon material, which has certain warmth retention.

[0004] However, at low temperatures, the amount of sweat the human body excretes decreases, but the evaporation rate of sweat is slower. The nylon-PU membrane-polyester composite fabric has low moisture permeability, and sweat condenses at the interface of the inner nylon-PU membrane to form an "ice crystal adsorption layer", which causes the body's perceived temperature to drop, affecting the heat storage and cold resistance. In addition, the nylon material's bending strength increases at low temperatures, which makes the clothes stiff and affects the wearing experience.

[0005] Therefore, it is necessary to improve the preparation method of the heat-storage cold-proof fabric in the prior art to solve the above problems. Summary of the Invention

[0006] The present invention overcomes the deficiencies of the prior art and provides a heat-storage cold-proof fabric and a preparation method thereof, aiming to solve the defects of the prior art heat-storage cold-proof fabric in poor moisture permeability and softness at low temperatures.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a method for preparing a heat-storage cold-proof fabric, comprising the following steps:

[0008] S1: dissolving wool fibers to obtain a preliminary wool protein solution, adding a wool coupling agent to the preliminary wool protein solution to obtain a modified wool protein solution; preparing silica particles and a silica coupling agent into a silica sol solution, placing polyethylene glycol fibers in the silica sol solution for 20-30 minutes, taking them out and soaking them in the modified wool protein solution for 30-60 minutes to obtain preliminary modified fibers, and soaking the preliminary modified fibers in water at 90-95° C. for 20-40 minutes to obtain hollow wool fibers;

[0009] S2: preparing Y-shaped nylon fibers through a Y-shaped spinneret, and weaving the Y-shaped nylon fibers and the hollow wool fibers as warp fibers to obtain an inner layer fabric;

[0010] S3: mixing graphene nanosheets and polyester chips at a mass ratio of 0.5-2:100 and spinning the mixture to obtain graphene-modified polyester filaments, and weaving the graphene-modified polyester filaments as warp yarns to obtain an outer fabric;

[0011] S4: The inner fabric and PU film in S2 and the outer fabric in S3 are hot-pressed and laminated in order from inside to outside to obtain a heat-storage and cold-proof fabric.

[0012] In a preferred embodiment of the present invention, the wool fiber is dissolved in S1 to obtain a preliminary wool protein solution by placing the wool fiber in a sodium sulfide solution with a volume fraction of 2-5% at 70-90° C. and stirring for 3-4 hours. The wool fiber has a diameter of 18-22 microns and a length of 2-5 mm.

[0013] In a preferred embodiment of the present invention, the mass fraction of the wool fiber in the preliminary wool protein solution is 15-20%, the mass fraction of the wool coupling agent in the modified wool protein solution is 1-1.2%, and the wool coupling agent is KH-550.

[0014] In a preferred embodiment of the present invention, the mass fractions of the silica particles and the silica coupling agent in the silica sol solution are 16-18% and 0.8-1.2%, respectively. The particle size of the silica particles is 20-50 nm, and the silica coupling agent is KH-570.

[0015] In a preferred embodiment of the present invention, the fineness of the polyethylene glycol fiber is 1.5D.

[0016] In a preferred embodiment of the present invention, the Y-shaped spinneret has an arm length of 50 μm, an arm width of 20 μm, and an included angle of 120°.

[0017] In a preferred embodiment of the present invention, the Y-shaped nylon fibers and the hollow wool fibers are arranged in a ratio of 1:1-3 when used as warp yarns, and the angles of the Y-shaped nylon fibers are consistent and face the PU film.

[0018] In a preferred embodiment of the present invention, the spinning process of the graphene-modified polyester filament in S3 is: the graphene nanosheets and polyester polyester chips are melt-blended at 260-280°C through a twin-screw extruder, and the blended melt is extruded into a ternary coagulation bath containing sodium sulfate / ethanol / water through a spinneret hole. The pore size of the spinneret hole is 0.15-0.3 mm, and the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 15-20% and 10-15% respectively, and the rest is water.

[0019] In a preferred embodiment of the present invention, the temperature of the hot pressing bonding in S4 is 160-200°C, the pressure is 1.5-2.5 MPa, the line speed is 2 m / min, the cooling temperature is 10°C, and the mass ratio between the inner layer fabric, the PU film and the outer layer fabric is 5-6:2-3:5.5-6.5.

[0020] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a heat-storage cold-proof fabric, which is prepared based on a preparation method of a heat-storage cold-proof fabric.

[0021] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0022] The present invention provides a preparation method of heat-storage cold-proof fabric, wherein an inner layer fabric is obtained by weaving hollow wool fibers and Y-type nylon fibers, an outer layer fabric is obtained by mixing and spinning graphene nanosheets and polyester chips, and the inner layer fabric, PU film and outer layer fabric are hot-pressed and composited to obtain the heat-storage cold-proof fabric, and a three-dimensional moisture-conducting network is constructed by hollow wool fibers and Y-type nylon fibers. The hollow structure forms internal microporous channels to accelerate water vapor transmission, and the branching morphology of the Y-type fibers greatly increases the contact area between the fibers and the air. The synergistic effect of the two enables sweat to diffuse quickly from the inner layer to the outer layer, effectively avoiding condensation accumulation. Compared with the heat-storage cold-proof fabrics in the prior art, the improvement of moisture permeability is achieved by constructing physical moisture-conducting channels. When worn continuously, the humidity of the inner layer can be maintained in a comfortable range for a long time, completely solving the problem of damp and cold feeling in low temperature environment, and the softness of the fabric is maintained due to the movable arrangement of the wool fibers and Y-type nylon, solving the defects of the heat-storage cold-proof fabrics in the prior art, such as poor moisture permeability and softness at low temperatures.

[0023] In the present invention, the smaller particle size allows the silica particles to form more contact points and interaction sites with the fiber molecules. Compared with the existing technology, the nano-silica particles can serve as support points to build fine channels or pore structures inside the fiber, further promoting the transmission and diffusion of water vapor and enhancing moisture permeability.

[0024] In the present invention, the reasonable combination of the arm length, arm width and angle of the Y-shaped nylon fiber enables the fibers to fit more tightly together during weaving, forming a more uniform interwoven structure. Compared with the existing technology, this tight and uniform interweaving method helps to disperse the stress generated by the fabric when it is subjected to force, avoiding local stress concentration that causes fiber deformation or breakage, so that the fabric can more evenly disperse the force when subjected to external forces such as stretching and bending, maintain good flexibility and softness in low-temperature environments, and improve wearing comfort.

[0025] In the present invention, there are a large number of tiny pores and channels inside the hollow wool fibers. These structures can significantly increase the specific surface area of ​​the fibers. Compared with the existing technology, the fibers' ability to adsorb and diffuse water vapor is greatly enhanced, thereby improving the moisture permeability of the fabric. In a low-temperature environment, the sweat produced by the human body can be absorbed by the hollow wool fibers and conducted to the outside more quickly, avoiding the damp and cold feeling caused by the accumulation of sweat on the body surface.

[0026] In the present invention, the two-dimensional sheet structure of graphene forms micro-nano moisture-conducting channels on the fiber surface. At the same time, its high thermal conductivity accelerates heat conduction, constructing a "moisture conduction-heat preservation-moisture removal" dynamic balance system. Compared with the existing technology, by changing the dual mechanism of water vapor flow path and heat conduction efficiency, the fabric can quickly discharge sweat in a low-temperature environment and maintain the body surface microenvironment temperature, so that the wearer always feels dry and warm. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments described in the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0028] Figure 1 It is a method step diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0031] The PU film in this application has a thickness of 20 μm, a porosity of 30%, and a pore size of 0.5 μm.

[0032] like Figure 1 As shown, a method for preparing a heat-storage cold-proof fabric comprises the following steps:

[0033] S1: dissolving wool fibers to obtain a preliminary wool protein solution, adding a wool coupling agent to the preliminary wool protein solution to obtain a modified wool protein solution; preparing silica particles and a silica coupling agent into a silica sol solution, placing polyethylene glycol fibers in the silica sol solution for 20-30 minutes, taking them out and soaking them in the modified wool protein solution for 30-60 minutes to obtain preliminary modified fibers, and soaking the preliminary modified fibers in water at 90-95°C for 20-40 minutes to obtain hollow wool fibers;

[0034] Hollow wool fibers are created by first placing polyethylene glycol fibers in a silica sol solution, then soaking them in a modified wool protein solution, and finally subjecting them to a high-temperature water treatment. Polyethylene glycol fibers are inherently water-soluble, and the hot water treatment creates a hollow structure. This increases the channels and pores within the fibers, facilitating the transmission and diffusion of water vapor, thereby improving the fabric's moisture permeability. This allows sweat to be quickly transferred from the inner layer to the outer layer and dissipated in low-temperature environments, avoiding the dampness and chill caused by sweat accumulation.

[0035] S2: Y-shaped nylon fibers are produced using Y-shaped spinnerets. These fibers and hollow wool fibers are then woven together as warp yarns to create the inner fabric. The Y-shaped structure of the Y-shaped nylon fibers produced using the Y-shaped spinnerets increases the contact area between the fibers and the surrounding environment, facilitating the adsorption and conduction of water vapor. The inner fabric is then woven with the Y-shaped nylon fibers and hollow wool fibers as warp yarns. The two fibers work together, with the internal channels of the hollow wool fibers and the unique shape of the Y-shaped nylon fibers creating efficient moisture-conducting pathways. This allows for smoother transfer of moisture from the inner layer to the outer layer, enhancing the inner fabric's moisture permeability and ensuring the proper dissipation of human sweat even in low-temperature conditions.

[0036] During the weaving process, the arrangement of Y-shaped nylon fibers and hollow wool fibers, along with their inherent properties, impart a certain softness to the fabric. The softness and elasticity of the Y-shaped nylon fibers, combined with the retained softness of the hollow wool fibers after modification, create a softer feel for the inner layer. This avoids the stiffness that can occur when the fibers are too rigid at low temperatures, thereby enhancing wearing comfort.

[0037] S3: mixing graphene nanosheets and polyester chips at a mass ratio of 0.5-2:100 and spinning the mixture to obtain graphene-modified polyester filaments, which are then used as warp yarns to weave an outer fabric.

[0038] Graphene has good thermal conductivity and water repellency, and increases the roughness of the fiber surface. This roughness can change the flow path of water vapor and promote the diffusion and transmission of water vapor. At the same time, the addition of graphene will also affect the crystallinity and orientation of polyester fibers, causing the microporous structure inside the fibers to change, thereby improving the moisture permeability of the fabric, which is conducive to the timely conduction of heat and moisture emitted by the human body, keeping dry and comfortable.

[0039] S4: The inner fabric and PU film in S2 and the outer fabric in S3 are hot-pressed and laminated in order from inside to outside to obtain a heat-storage and cold-proof fabric.

[0040] The inner fabric is obtained by weaving hollow wool fibers and Y-type nylon fibers, and the outer fabric is obtained by mixing and spinning graphene nanosheets and polyester chips and then weaving them. The inner fabric, PU film and outer fabric are hot-pressed and composited to obtain heat-storage cold-proof fabric. Hollow wool fibers and Y-type nylon fibers are used to construct a three-dimensional moisture-conducting network. The hollow structure forms internal microporous channels to accelerate water vapor transmission, and the branched morphology of the Y-type fibers greatly increases the contact area between the fiber and the air. The synergistic effect of the two enables sweat to diffuse quickly from the inner layer to the outer layer, effectively avoiding condensation accumulation. The improvement of moisture permeability is achieved by constructing physical moisture-conducting channels. When worn continuously, the humidity of the inner layer can be maintained in a comfortable range for a long time, completely solving the problem of damp and cold feeling in low temperature environment. The flexible arrangement of wool fibers and Y-type nylon maintains the softness of the fabric, solving the defects of poor moisture permeability and softness of heat-storage cold-proof fabrics in the prior art at low temperatures.

[0041] In S1, the wool fibers are dissolved to obtain a preliminary wool protein solution by placing the wool fibers in a 2-5% sodium sulfide solution at 70-90°C and stirring for 3-4 hours. The wool fibers have a diameter of 18-22 microns and a length of 2-5 mm. This solution effectively dissolves the wool fibers, releasing wool protein and helping to break down some of the chemical bonds within the wool fibers, freeing the protein molecules to form a preliminary wool protein solution, which provides a good foundation for subsequent modification.

[0042] Hollow wool fibers contain numerous tiny pores and channels, which significantly increase the fiber's specific surface area, greatly enhancing the fiber's ability to absorb and diffuse water vapor, thereby improving the fabric's moisture permeability. In low-temperature environments, sweat produced by the human body is more quickly absorbed by the hollow wool fibers and conducted to the outside, avoiding the clammy feeling caused by sweat accumulation on the body surface.

[0043] The dissolution process removes some of the rough, hard keratinized proteins from the wool fibers, leaving the remaining protein molecules relatively uniform and fine. This imparts greater flexibility and plasticity to the initial wool protein solution, facilitating subsequent compounding with other materials to form soft, modified fibers. When these protein molecules combine with other substances, the resulting fibers retain a certain strength while also possessing enhanced flexibility, ensuring the overall softness of the fabric.

[0044] During the subsequent weaving process, the treated wool fibers, thanks to the flexibility and plasticity of their protein molecules, can be more tightly and evenly interwoven with other fibers, forming a fluffy, soft fabric structure. This structure not only improves the warmth retention of the fabric, but also imparts excellent elasticity and a soft feel, making it more comfortable to wear, and preventing the fabric from becoming stiff and affecting the wearing experience in low-temperature environments.

[0045] Finer fibers also have a larger contact area with the sodium sulfide solution, which helps the dissolution reaction proceed more fully and allows the protein molecules to be released more evenly. After the hollow structure is subsequently formed, the micropores and channels within it are also relatively finer and more uniform, which facilitates the microcirculation and transmission of water vapor and further improves moisture permeability.

[0046] When wool fibers of moderate length are dissolved, they can ensure a certain stability in the solution. They will not quickly settle or aggregate due to being too short, nor will they be difficult to fully dissolve and disperse due to being too long.

[0047] The initial wool protein solution contains 15-20% wool fiber by mass, while the modified wool protein solution contains 1-1.2% wool coupling agent, KH-550. This ensures sufficient wool protein molecules for subsequent modification to form a protein film or structure with sufficient strength and integrity, while also preventing excessive solution viscosity from affecting subsequent composite and processing with other materials due to excessive wool protein concentration. The appropriate amount of wool protein molecules facilitates the formation of a uniform, continuous structure, providing a stable channel for water vapor transmission.

[0048] As an aminosilane coupling agent, KH-550 can form a chemical bond between wool protein and polyethylene glycol fiber, improving the compatibility and affinity between the two. When the composite fiber is subsequently formed, the different materials are tightly bonded to form a stable interface, which is conducive to the rapid transmission of water vapor between the interfaces of different materials, avoiding the accumulation and blockage of water vapor at the interface, thereby improving the moisture permeability of the entire composite structure.

[0049] A wool fiber mass fraction of 15-20% ensures excellent fluidity and processability in the initial wool protein solution. When subsequently composited with other materials to form fibers, the solution is evenly distributed and coated on the surface of the other materials, forming a soft protein coating. This coating not only provides a certain degree of flexibility but also harmonizes with the softness of the other materials, giving the resulting initial modified fibers excellent softness and laying the foundation for the subsequent preparation of soft hollow wool fibers.

[0050] An appropriate amount of KH-550 coupling agent acts as a lubricant and bridge between wool protein molecules and between wool protein and other materials, reducing friction and entanglement between molecules. During subsequent processing, this effect allows the fiber to deform more smoothly during stretching, bending, and other deformations, enhancing its softness and elasticity. Furthermore, composite fibers formed by KH-550-modified wool protein and materials such as polyethylene glycol fibers possess a more flexible and break-resistant internal structure, further enhancing the fiber's softness. This ensures that the resulting fabric maintains excellent softness and comfort even in low-temperature environments.

[0051] The mass fractions of silica particles and silica coupling agent in the silica sol solution are 16-18% and 0.8-1.2%, respectively. The silica particles have a particle size of 20-50 nm, and the silica coupling agent is KH-570. An appropriate amount of silica particles can be evenly dispersed in the silica sol solution, forming a stable colloidal structure. When polyethylene glycol fibers are placed within this solution, the silica particles adhere well to the fiber surface, increasing the fiber's specific surface area and roughness. This facilitates the adsorption and diffusion of water vapor on the fiber surface, making it easier for water vapor to transfer from the fiber surface, thereby improving moisture permeability. If the mass fraction of silica particles is too high, particles will agglomerate, forming an uneven coating and impairing moisture permeability. However, if the mass fraction is too low, the desired enhanced moisture permeability will not be achieved.

[0052] Nano-sized silica particles possess a large specific surface area and high activity. Their small size creates more contact points and interaction sites between the silica particles and fiber molecules. When subsequently combined with other materials to form hollow wool fibers, these nano-silica particles serve as support points, creating microscopic channels or pores within the fibers, further facilitating the transport and diffusion of water vapor and enhancing moisture permeability.

[0053] KH-570, a silane coupling agent, forms a stable chemical bond between silica particles and polyethylene glycol fibers through chemical bridging, enhancing their compatibility and affinity. This favorable combination allows the silica particles to stably adhere to the fibers during subsequent processing. Furthermore, after forming hollow wool fibers, it ensures the stability and connectivity of the fiber's internal channels and pore structure, facilitating the continuous and stable transmission of water vapor and improving moisture permeability.

[0054] At this mass fraction, the silica particles form a relatively uniform coating that isn't excessively thick. This uniform coating allows the polyethylene glycol fiber to maintain good flexibility during subsequent processing, preventing the fiber from becoming brittle or losing its elasticity due to excessively thick coatings. The appropriate amount of silica particles forms a protective film on the fiber surface, which both strengthens and modifies the fiber without significantly negatively affecting its softness. This allows the initially modified fiber to maintain a good softness after subsequent processing, laying the foundation for the softness of the final fabric.

[0055] The polyethylene glycol fiber has a fineness of 1.5D. Once dissolved, it forms hollow channels within the wool fibers, significantly increasing the fiber's internal surface area. This allows for smoother diffusion paths for water vapor within the fibers, accelerating vapor transport and improving the fabric's moisture permeability. The hollow structure interweaves with other fibers to form a multi-dimensional moisture-conducting network. In low-temperature environments, sweat can quickly diffuse outward through these hollow channels and interfiber pores, preventing sweat from accumulating on the surface and keeping the skin dry and cool.

[0056] The hollow wool fibers formed by dissolving the polyethylene glycol fibers are lighter and less rigid, making them softer and easier to interweave with other fibers, thereby improving the overall softness of the fabric. The hollow structure makes the fibers lighter and more flexible when interwoven, reducing friction and resistance between fibers. This allows the fabric to bend and stretch more naturally when subjected to stress, enhancing wearing comfort.

[0057] The Y-shaped spinneret has an arm length of 50μm, a width of 20μm, and an included angle of 120°. This gives the ejected Y-shaped nylon fibers a larger surface area, allowing more surface area to come into contact with the air. This allows them to more effectively absorb and adsorb moisture from the outside, transferring it to the outer fabric for dissipation, thereby improving the overall moisture permeability of the fabric. In low-temperature environments, this helps to promptly channel sweat as water vapor, keeping the wearer dry and comfortable.

[0058] When woven into the inner fabric, the Y-shaped fibers' unique shape creates specialized moisture-transmitting pathways. When multiple Y-shaped nylon fibers are interwoven, their spatial arrangement and interaction guide water vapor along specific pathways, creating an efficient vapor transport network within the fabric. This allows water vapor to diffuse more smoothly from the inner to the outer layers, reducing vapor accumulation within the fabric and further enhancing moisture permeability.

[0059] When woven with other fibers, Y-shaped nylon fibers impart a more natural, softer feel to the fabric. Compared to conventionally shaped nylon fibers, Y-shaped nylon fibers are more easily bent and deformed during the weaving process, better adapting to the various forces acting during the weaving process. This reduces fiber breakage and damage, and enhances the fabric's softness and elasticity.

[0060] The optimal combination of arm length, arm width, and angle of the Y-shaped nylon fibers allows for a tighter interlocking of the fibers during weaving, resulting in a more uniform interweaving structure. This tight and uniform interweaving helps disperse stress generated when the fabric is subjected to loads, preventing localized stress concentration that can cause fiber deformation or breakage. This allows the fabric to more evenly distribute forces such as stretching and bending, maintaining excellent flexibility and softness in low-temperature environments, thereby enhancing wearing comfort.

[0061] The Y-shaped nylon fibers and hollow wool fibers are arranged as warp yarns in a ratio of 1:1-3. The Y-shaped nylon fibers are aligned at angles and face the PU membrane. This proportional arrangement of the Y-shaped nylon fibers and the hollow wool fibers, combined with the Y-shaped nylon fibers' aligned angles and facing the PU membrane, creates an organized moisture-conducting pathway. The unique shape and orientation of the Y-shaped nylon fibers help guide moisture vapor in a specific direction, allowing it to more efficiently transfer moisture from the inner layer to the outer layer, where it is then dissipated through the PU membrane. This improves the overall moisture permeability of the fabric and prevents moisture accumulation in the inner layer.

[0062] Hollow wool fibers inherently possess excellent air permeability and moisture absorption, while Y-shaped nylon fibers offer superior moisture conduction. By properly controlling the ratio of these two fibers, the respective advantages of hollow wool fibers and Y-shaped nylon fibers can be fully utilized while maintaining a certain level of warmth retention. This creates a synergistic effect of moisture absorption, conduction, and permeability, further enhancing the fabric's moisture permeability.

[0063] The Y-nylon fibers and hollow wool fibers are arranged in a specific ratio, ensuring that stress is more evenly distributed across the different fiber types when the fabric is subjected to stress. The Y-nylon fibers possess a certain degree of softness and elasticity, while the hollow wool fibers are also relatively soft. When the two are interwoven, interfiber interaction and friction are relatively minimal. A ratio between 1:1 and 3 ensures that the Y-nylon fibers provide sufficient moisture-wicking properties within the fabric without causing the fabric to become stiff due to an excessive Y-nylon fiber content, thus maintaining the fabric's overall softness.

[0064] The Y-shaped nylon fibers have the same angle direction and face the PU membrane, which cooperates with the hollow wool fibers. This allows the fibers to slide and deform more flexibly against each other when the fabric is bent and stretched, similar to the natural bending and stretching characteristics of natural fibers. This gives the fabric better flexibility and softness, improving wearing comfort.

[0065] The spinning process of graphene-modified polyester filament in S3 is as follows: graphene nanosheets and polyester polyester chips are melt-blended at 260-280°C through a twin-screw extruder, and the blended melt is extruded into a ternary coagulation bath containing sodium sulfate / ethanol / water through a spinneret hole with an aperture of 0.15-0.3mm. The volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 15-20% and 10-15% respectively, and the rest is water.

[0066] Graphene's two-dimensional sheet structure forms micro-nano moisture-conducting channels on the fiber surface. At the same time, its high thermal conductivity accelerates heat conduction, building a dynamic balance system of "moisture conduction-heat preservation-moisture removal". By changing the dual mechanism of water vapor flow path and heat conduction efficiency, the fabric can quickly expel sweat in low-temperature environments and maintain the body surface microenvironment temperature, so that the wearer always feels dry and warm.

[0067] Sodium sulfate can improve the conductivity of the solution, promote rapid coagulation of the fibers, and make the fiber structure denser. Ethanol can reduce the surface tension of water, allowing the fibers to form more evenly during the coagulation process, further improving the surface properties and internal structure of the fibers and increasing their air and moisture permeability.

[0068] The synergistic effect of sodium sulfate and ethanol not only ensures uniform fiber formation during the coagulation process, but also prevents excessive stress concentration points within the fibers, giving them excellent flexibility and elasticity. The resulting outer fabric stretches and flexes naturally with human movement, without the impact of fiber stiffness that would otherwise affect wearing comfort.

[0069] The weft yarns in the inner fabric and the outer fabric are both 50S cotton fibers, and the warp and weft densities are 100-120×80-100 yarns / cm and 90-110×70-80 yarns / cm respectively.

[0070] The S4 hot-press bonding process operates at a temperature of 160-200°C, a pressure of 1.5-2.5 MPa, a line speed of 2 m / min, and a cooling temperature of 10°C. The mass ratios of the inner fabric, PU film, and outer fabric are 5-6:2-3:5.5-6.5. The outer fabric provides excellent windproofing and moderate moisture permeability, the inner fabric offers excellent moisture absorption and warmth retention, and the PU film plays a key role in waterproofing and moisture permeability. By rationally adjusting the mass ratios of these three components, the overall fabric maintains high moisture permeability while avoiding the degradation of overall performance caused by excessive use of any one layer. For example, excessive outer fabric can make the fabric thicker and stiffer, while excessive inner fabric can increase warmth but reduce moisture permeability. This optimized mass ratio ensures that the layers work synergistically after lamination, forming a thermal insulation fabric system that is both warm and breathable, yet soft and comfortable.

[0071] A heat-storage cold-proof fabric is prepared based on a preparation method of the heat-storage cold-proof fabric.

[0072] Embodiment 1: This embodiment provides a method for preparing a heat-storage cold-proof fabric, comprising the following steps:

[0073] S1: Wool fibers were placed in a 3% sodium sulfide solution at 80°C and stirred for 4 hours. The wool fibers had a diameter of 20 μm and a length of 4 mm to obtain a preliminary wool protein solution. The wool fiber mass fraction in the preliminary wool protein solution was 20%. A wool coupling agent was added to the preliminary wool protein solution to obtain a modified wool protein solution. The wool coupling agent in the modified wool protein solution was 1.2% by mass. The wool coupling agent was KH-550.

[0074] Silica particles and a silica coupling agent were prepared into a silica sol solution, wherein the mass fractions of the silica particles and the silica coupling agent in the silica sol solution were 15% and 1.0%, respectively. The particle size of the silica particles was 30 nm, and the silica coupling agent was KH-570. Polyethylene glycol fibers with a fineness of 1.5D were placed in the silica sol solution for 30 minutes, taken out, and then soaked in a modified wool protein solution for 60 minutes to obtain preliminary modified fibers. The preliminary modified fibers were then soaked in 90°C water for 30 minutes to obtain hollow wool fibers.

[0075] S2: Y-shaped nylon fibers were prepared through a Y-shaped spinneret with an arm length of 50 μm, an arm width of 20 μm, and an included angle of 120°. The Y-shaped nylon fibers and hollow wool fibers were used as warp fibers for weaving. The Y-shaped nylon fibers and hollow wool fibers were arranged in a 1:1 ratio as warp fibers to obtain an inner layer fabric.

[0076] S3: Graphene nanosheets and polyester polyester chips are mixed in a mass ratio of 1:100 and then spun. Specifically, the graphene nanosheets and polyester polyester chips are melt-blended at 270°C through a twin-screw extruder, and the blended melt is extruded into a ternary coagulation bath containing sodium sulfate / ethanol / water through a spinneret. The spinneret aperture is 0.2 mm, and the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 15% and 10%, respectively, and the rest is water, to obtain graphene-modified polyester filaments. The graphene-modified polyester filaments are used as warp yarns to weave the outer fabric; the weft yarns in the inner and outer fabrics are both 50S cotton fibers, and the warp and weft densities are 120×100 strands / cm and 90×70 strands / cm, respectively.

[0077] S4: The outer fabric and PU film in S2 and the inner fabric in S3 are hot-pressed in order from outside to inside. The hot-pressing temperature is 180°C, the pressure is 2.0 MPa, the line speed is 2 m / min, the cooling temperature is 10°C, the mass ratio between the inner fabric, PU film and outer fabric is 5:3:6, and the angle direction of the Y-shaped nylon fiber is consistent and toward the PU film, thereby obtaining a heat-storage and cold-proof fabric.

[0078] Example 2: This example differs from Example 1 in that the mass fraction of silicon dioxide particles in the silica sol solution is 16%, and the rest are the same.

[0079] Example 3: This example differs from Example 1 in that the mass fraction of silicon dioxide particles in the silica sol solution is 17%, and the rest are the same.

[0080] Example 4: This example differs from Example 1 in that the mass fraction of silicon dioxide particles in the silica sol solution is 18%, and the rest are the same.

[0081] Example 5: This example differs from Example 1 in that the mass fraction of silicon dioxide particles in the silica sol solution is 19%, and the rest are the same.

[0082] Example 6: The difference between this example and Example 3 is that the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 12.5% ​​and 10% respectively, and the rest is water.

[0083] Example 7: The difference between this example and Example 3 is that the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 17.5% and 10% respectively, and the rest is water.

[0084] Example 8: The difference between this example and Example 3 is that the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 20% and 10% respectively, and the rest is water.

[0085] Example 9: The difference between this example and Example 3 is that the volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 22.5% and 10% respectively, and the rest is water.

[0086] Comparative Example 1: This comparative example prepares a heat-storage cold-proof fabric, and the preparation process is as follows:

[0087] S1: Weaving polyester fibers with a diameter of 0.2 mm as warp fibers to obtain an outer fabric;

[0088] S2: Nylon fibers with a fineness of 1.5D are used as warp fibers to weave the inner fabric. The weft yarns in the inner and outer fabrics are both 50S cotton fibers with warp and weft densities of 120 × 100 strands / cm and 90 × 70 strands / cm, respectively.

[0089] S3: The outer fabric and PU film in S1 and the inner fabric in S2 are hot-pressed and laminated in order from outside to inside. The hot-pressing temperature is 180°C, the pressure is 2.0 MPa, the line speed is 2 m / min, the cooling temperature is 10°C, and the mass ratio between the inner fabric, PU film and outer fabric is 5:3:6, to obtain a high water pressure and moisture permeable heat storage and cold-proof fabric.

[0090] Samples of equal area were taken from Examples 1 to 9 and Comparative Example 1, and the samples were tested for moisture permeability according to GB / T 12704.1-2009 and for softness according to GB / T 18318. The test data are shown in Table 1.

[0091] Table 1 Test data of moisture permeability and softness of Examples 1 to 9 and Comparative Example 1

[0092] As can be seen from Table 1, the moisture permeability of Examples 1 to 9 is greater than that of Comparative Example 1, and the bending stiffness of Examples 1 to 9 is less than that of Comparative Example 1. The moisture permeability is positively correlated with the moisture permeability, and the bending stiffness is negatively correlated with the softness. The present application has superiority.

[0093] In Examples 1 to 5, as the mass fraction of silica particles in the silica sol solution gradually increases, the moisture permeability and softness first increase and then decrease. This is because the silica particles themselves have a large specific surface area and good adsorption properties. Increasing their mass fraction in the silica sol solution appropriately can allow the inner wall of the hollow wool fiber to adsorb more silica particles, forming a more uniform and dense coating, which can effectively improve the surface adsorption properties of the fiber, making water vapor more easily adsorbed and conducted, thereby enhancing moisture permeability. However, when the mass fraction of the silica particles is too high, agglomeration is likely to occur between the particles, causing the coating formed on the inner wall of the hollow wool fiber to become uneven and discontinuous, and even accumulation and blockage of particles may occur, hindering the normal diffusion and transmission of water vapor on the fiber surface, thereby reducing moisture permeability. An appropriate amount of silica particles forms a relatively uniform coating on the inner wall of the hollow structure, which can fill some tiny irregularities on the inner wall of the hollow structure, making the inner wall of the hollow structure smoother. This helps reduce friction within the fiber, allowing the fiber to bend and stretch more smoothly, thereby improving the softness of the fabric. However, when the silica particle content is too high, the coating formed on the inner wall of the hollow structure will be too thick, which will make the fiber as a whole stiff and reduce its flexibility. An excessively thick coating will increase the rigidity of the fiber, causing it to experience greater resistance when bending and stretching, thereby reducing the softness of the fabric. The preferred embodiment is Example 3.

[0094] In Example 3 and Examples 6 to 9, as the volume fraction of sodium sulfate in the ternary coagulation bath gradually increases, the moisture permeability and softness first increase and then decrease. This is because an appropriate increase in the volume fraction of sodium sulfate can improve the conductivity and ionic strength of the coagulation bath, allowing the blended melt to solidify faster after being sprayed in. This helps to form fibers with a more uniform and dense structure, optimizes the internal pore distribution and connectivity, thereby improving moisture permeability, improving the roughness of the fiber surface, and increasing the capillary effect on the fiber surface, which is beneficial to water vapor adsorption and transmission. However, when the volume fraction of sodium sulfate is too high, the melt solidification rate will be too fast, resulting in internal stress concentration and microcracks and other defects, which hinder water vapor transmission. Too high a concentration of sodium sulfate will cause the fiber surface to be too dense or form a hard shell that is difficult to penetrate, which in turn reduces moisture permeability. An appropriate amount of sodium sulfate can promote uniform fiber solidification, reduce internal defects and stress concentration points, and make the fiber have better flexibility and elasticity. However, too high a concentration will cause too fast solidification, stress concentration and defects in the fiber, making the fiber brittle, and causing a hard shell to form on the fiber surface, reducing the flexibility and softness of the fiber. The preferred embodiment is embodiment seven.

[0095] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A method for preparing a heat-storage cold-proof fabric, characterized in that: The following steps are involved: S1: dissolving wool fibers to obtain a preliminary wool protein solution, adding a wool coupling agent to the preliminary wool protein solution to obtain a modified wool protein solution; preparing silica particles and a silica coupling agent into a silica sol solution, placing polyethylene glycol fibers in the silica sol solution for 20-30 minutes, taking them out and soaking them in the modified wool protein solution for 30-60 minutes to obtain preliminary modified fibers, and soaking the preliminary modified fibers in water at 90-95° C. for 20-40 minutes to obtain hollow wool fibers; S2: preparing Y-shaped nylon fibers through a Y-shaped spinneret, weaving the Y-shaped nylon fibers and the hollow wool fibers as warp fibers, wherein the Y-shaped nylon fibers and the hollow wool fibers are arranged in a ratio of 1:1-3 as warp fibers, to obtain an inner layer fabric; S3: mixing graphene nanosheets and polyester polyester chips in a mass ratio of 0.5-2:100 and spinning the mixed fibers. The specific process is to melt-blend the graphene nanosheets and polyester polyester chips at 260-280° C. through a twin-screw extruder, and extruding the blended melt into a ternary coagulation bath containing sodium sulfate / ethanol / water through a spinneret orifice with an aperture of 0.15-0.3 mm. The volume fractions of sodium sulfate and ethanol in the ternary coagulation bath are 15-20% and 10-15%, respectively, and the remainder is water, to obtain graphene-modified polyester filaments, and the graphene-modified polyester filaments are used as warp yarns to weave the outer fabric. S4: The inner fabric and PU film in S2 and the outer fabric in S3 are hot-pressed and laminated in order from inside to outside, and the angles of the Y-shaped nylon fibers in the inner fabric are consistent and face the PU film, thereby obtaining a heat-storage and cold-proof fabric.

2. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The wool fiber is dissolved to obtain the preliminary wool protein solution in S1 as follows: the wool fiber is placed in a sodium sulfide solution with a volume fraction of 2-5% at 70-90° C. and stirred for 3-4 hours. The wool fiber has a diameter of 18-22 μm and a length of 2-5 mm.

3. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The mass fraction of the wool fiber in the preliminary wool protein solution is 15-20%, the mass fraction of the wool coupling agent in the modified wool protein solution is 1-1.2%, and the wool coupling agent is KH-550.

4. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The mass fractions of the silica particles and the silica coupling agent in the silica sol solution are 16-18% and 0.8-1.2% respectively. The particle size of the silica particles is 20-50 nm. The silica coupling agent is KH-570.

5. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The fineness of the polyethylene glycol fiber is 1.5D.

6. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The Y-shaped spinneret has an arm length of 50 μm, an arm width of 20 μm, and an included angle of 120°.

7. The method for preparing a heat-storage cold-proof fabric according to claim 1, characterized in that: The temperature of hot pressing bonding in S4 is 160-200°C, the pressure is 1.5-2.5 MPa, the line speed is 2 m / min, the cooling temperature is 10°C, and the mass ratio between the inner fabric, the PU film and the outer fabric is 5-6:2-3:5.5-6.

5.

8. A heat-storage cold-proof fabric, characterized in that: It is prepared based on the preparation method of a heat-storage cold-proof fabric according to any one of claims 1-7.

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