Wool composite fabric and preparation method thereof

Abstract

The present invention proposes a wool composite fabric and a preparation method thereof, wherein the wool composite fabric includes a surface sheet and a filler arranged in the internal space of the surface sheet, the filler includes a modified wool flocculent, and the surface sheet includes a non-woven fabric layer and a metal nanolayer deposited on the surface of the non-woven fabric layer. By combining the modified wool flocculent, the non-woven fabric layer and the metal nanolayer, the wool composite fabric realizes multiple temperature control mechanisms, including heat conduction inhibition, heat radiation reflection, moisture absorption and heat release, and convection blocking. The wool composite fabric provides excellent thermal insulation performance and is particularly suitable for the field of fabrics that require constant temperature and cold protection. Moreover, the wool composite fabric significantly reduces the impact on the environment. From the entire life cycle of raw material acquisition, production and manufacturing, use to final disposal, it embodies the concept of environmental protection, has important ecological benefits and social value, and has made a positive contribution to the development of green textiles.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite fabrics, and in particular relates to a wool composite fabric and a preparation method thereof. Background Art

[0002] Modern thermal insulation fabrics are widely used in industrial and medical applications, utilizing a variety of materials. In industry, many pipelines and equipment, such as chemical processing equipment, liquid pipelines, and storage tanks, must maintain specific temperatures in low-temperature environments. Thermal insulation fabrics act as insulation layers for these equipment, ensuring stable temperatures, reducing energy loss, and improving operational efficiency. In medical applications, thermal insulation fabrics are used on hospital beds and operating tables to help maintain patient body temperature, especially during surgery or treatment when body temperature fluctuates.

[0003] Thermal insulation fabrics used in related technologies are primarily made of synthetic fibers. On the one hand, the thermal insulation performance of synthetic fibers decreases significantly in cold and humid environments. This is because synthetic fibers generally have high thermal conductivity and transfer heat more easily, which causes heat to be transferred to the outside more quickly through the fabric, making it difficult to maintain warmth.

[0004] On the other hand, many current thermal fabrics also present significant environmental challenges. Synthetic fibers such as polyester and acrylic are difficult to degrade naturally and can remain in the environment for extended periods after being discarded, contributing to white pollution. The production process of synthetic materials not only consumes significant amounts of energy but also generates significant amounts of wastewater and harmful gases, increasing the risk of environmental pollution. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a wool composite fabric and a preparation method thereof, aiming to solve the problems of poor thermal insulation performance of the fabric and environmental pollution.

[0006] In order to solve the above technical problems, the present invention is implemented as follows: the present invention proposes a wool composite fabric, comprising: a surface sheet and a filler arranged in the internal space of the surface sheet, the filler comprises modified wool flocculent, the surface sheet comprises a non-woven fabric layer and a metal nanolayer deposited on the surface of the non-woven fabric layer.

[0007] In some embodiments of the present invention, the modified wool flocculent includes a polymer and wool fibers, the polymer includes at least one of poly (L-lactic acid), polyvinyl alcohol, polycaprolactone, polyurethane, polylactic acid-caprolactone copolymer, and polybutylene succinate, the diameter of the wool fibers is 18 to 22 μm, and the diameter to length ratio of the wool fibers is 1:100 to 300.

[0008] In some embodiments of the present invention, the metal nanolayer includes at least one of aluminum, magnesium, titanium, and copper, and the metal particle size of the metal nanolayer is 5 to 80 nm.

[0009] The present invention provides a preparation method for preparing the wool composite fabric as described above, and the preparation method comprises the following steps:

[0010] S1. Modifying wool;

[0011] S2, flocculating the modified wool to obtain a modified wool flocculent;

[0012] S3, placing the nonwoven fabric in a deposition device and performing metal deposition treatment to obtain a surface sheet;

[0013] S4. Assembling the modified wool flocculent and the surface sheet to obtain the wool composite fabric.

[0014] In some embodiments of the present invention, step S1 includes:

[0015] S1.1. Add the wool raw material to a weak alkaline solution for washing;

[0016] S1.2. The cleaned wool raw material is subjected to a beating machine to be broken up to obtain wool fibers, wherein the rotation speed of the beating machine is 800-1500 RPM;

[0017] S1.3, pretreating the polymer to obtain a dispersed polymer;

[0018] S1.4. Uniformly mixing the wool fiber and the dispersed polymer to obtain modified wool, wherein the weight ratio of the dispersed polymer to the wool fiber is 2-3:25.

[0019] In some embodiments of the present invention, step S3 includes:

[0020] S3.1. Clean the surface of the non-woven fabric;

[0021] S3.2. Select a metal material and perform high-temperature vaporization to obtain metal vapor;

[0022] S3.3. Place the cleaned nonwoven fabric in a reactor, introduce inert gas and the metal vapor to perform deposition, and obtain the surface sheet after cooling.

[0023] In some embodiments of the present invention, step S3.3 includes:

[0024] The cleaned nonwoven fabric is placed in a reaction kettle, and the reaction kettle is evacuated and an inert gas is introduced;

[0025] First, the metal vapor is introduced to form a metal nano-deposition layer, and then polyvinyl alcohol or sodium chloride solution is added, and after drying, a removable layer covering the metal nano-deposition layer is formed;

[0026] Alternately depositing the metal nano-deposition layer and the removable layer, and stopping after a preset number of alternating deposition times is reached;

[0027] The non-woven fabric after deposition is immersed in deionized water, and is heated, stirred, washed, dried, and cooled in sequence to obtain the surface sheet, wherein the heating temperature is 40-60°C.

[0028] In some embodiments of the present invention, the metal material comprises 80-90% aluminum and 10-20% magnesium, calculated by weight.

[0029] Compared with the prior art, the wool composite fabric and its preparation method in the present invention have the following beneficial effects:

[0030] By combining a modified wool flocculent, a nonwoven fabric layer, and a metal nanolayer, this wool composite fabric achieves multiple temperature control mechanisms, including heat conduction suppression, heat radiation reflection, moisture absorption and heat release, and convection blocking. The wool composite fabric offers excellent thermal insulation, making it particularly suitable for applications requiring constant temperature and cold protection. Furthermore, the wool composite fabric significantly reduces its environmental impact. From raw material acquisition, manufacturing, use, to final disposal, it embodies environmental protection throughout its entire life cycle, delivering significant ecological benefits and social value, and contributing positively to the development of green textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic flow chart of a method for preparing a wool composite fabric in one embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The present invention provides a wool composite fabric, comprising: a surface sheet and a filler arranged in the inner space of the surface sheet, the filler comprising modified wool flocculent, and the surface sheet comprising a non-woven fabric layer and a metal nanolayer deposited on the surface of the non-woven fabric layer.

[0034] Wool itself has excellent thermal insulation properties, as its curled fiber structure traps large amounts of air, forming an insulating layer. Modified wool flocs may further optimize the interfiber spacing, enhancing air retention and improving thermal insulation. Wool fibers absorb moisture without appearing damp. During this process, they release heat (hygroscopic exothermicity), raising the fabric's temperature and helping to maintain warmth in cold environments. The filling forms multiple layers of air within the surface sheet. Air has low thermal conductivity, effectively blocking heat conduction. Modified wool flocs use biodegradable polymers such as poly (L-lactic acid) (PLA) and polycaprolactone (PCL). These materials are decomposed by microorganisms in the natural environment, ultimately converting into carbon dioxide and water, leaving no environmental impact.

[0035] The metal nanolayer deposited on the surface of the nonwoven fabric has a high reflectivity, especially for infrared radiation (thermal radiation). This means that external thermal radiation is difficult to penetrate into the fabric, while internal heat is not easily dissipated. Furthermore, the nanometer-sized metal nanoparticles resonate with infrared wavelengths, enhancing their reflection and scattering capabilities. This creates a thermal barrier that slows the exchange of heat between the inside and outside, thereby maintaining temperature.

[0036] By combining modified wool flocculents, a nonwoven fabric layer, and a metal nanolayer, this wool composite fabric achieves multiple temperature control mechanisms, including heat conduction suppression, heat radiation reflection, moisture absorption and heat release, and convection blocking. Furthermore, the wool composite fabric significantly reduces its environmental impact. From raw material acquisition, manufacturing, use, to final disposal, it embodies environmental protection throughout its entire life cycle, delivering significant ecological and social benefits, and making a positive contribution to the development of green textiles.

[0037] Furthermore, the modified wool flocculent includes a polymer and wool fibers, the polymer includes at least one of poly (L-lactic acid), polyvinyl alcohol, polycaprolactone, polyurethane, polylactic acid-caprolactone copolymer, and polybutylene succinate, the diameter of the wool fibers is 18 to 22 μm, and the diameter to length ratio of the wool fibers is 1:100 to 300.

[0038] Wool fibers have a diameter of 18 to 22 μm, for example, 19 μm or 20 μm, and exhibit excellent strength and flexibility. The diameter-to-length ratio is 1:100 to 300, for example, 1:100, 1:200, or 1:300. This high aspect ratio allows the fibers to form a three-dimensional network within the material, increasing the air content within the material, further enhancing its thermal insulation properties, and significantly improving its tensile strength and tear resistance.

[0039] Wool fibers serve as the reinforcing phase, and the polymer serves as the matrix, working synergistically to form a composite material. The three-dimensional fiber network and the bonding effect of the polymer jointly enhance the mechanical properties of the material. The high aspect ratio of wool fibers allows for easy and uniform dispersion within the polymer matrix, forming a stable fiber network structure that improves the uniformity and quality stability of the material. Polymers such as poly(L-lactic acid), polyvinyl alcohol, polycaprolactone, and polyurethane form a good interfacial bond with the wool fibers, enhancing interfiber adhesion and improving the overall mechanical properties of the composite material.

[0040] The metal nanolayer includes at least one of aluminum, magnesium, titanium, and copper, and the metal particle size of the metal nanolayer is 5 to 80 nm, for example, 40 nm or 50 nm.

[0041] The metal nanolayer has a high reflectivity for infrared radiation, effectively reflecting thermal radiation and reducing heat ingress, maintaining a stable internal temperature. This is crucial for thermal insulation materials, especially in cold environments. The metal nanolayer improves the material's stability in high-temperature environments, preventing deformation or loss of performance due to high temperatures, making it suitable for applications in extreme temperature conditions. The nano-sized metal layer forms a protective film on the surface, significantly improving the material's oxidation resistance and corrosion resistance, extending its service life. This is particularly important for fabrics used in humid or corrosive environments.

[0042] Please refer to Figure 1 The present invention proposes a preparation method for preparing a wool composite fabric, the preparation method comprising the following steps:

[0043] S1. Modifying wool. Modifying wool can significantly improve the properties of wool fibers, thereby enhancing the overall performance of wool composite fabrics.

[0044] The specific steps are as follows:

[0045] S1.1. Add the wool raw material into a weak alkaline solution for washing.

[0046] Wool often contains impurities such as lanolin, sweat, and dust. Weakly alkaline solutions (such as diluted sodium hydroxide or sodium carbonate solutions) can effectively dissolve and remove these impurities, leaving the wool fibers cleaner.

[0047] The cleaning process reduces the hydrophobic substances on the fiber surface and increases the hydrophilicity of the fiber, which is beneficial for the subsequent combination with water-soluble polymers or other additives.

[0048] The cleaned fiber surface is more active, exposing more active groups, providing better reaction conditions for subsequent modification. Timely cleaning can prevent the degradation of natural proteins in wool and maintain the integrity and performance of the fiber.

[0049] S1.2. The cleaned wool raw material is broken up by a breaker to obtain wool fibers, wherein the speed of the breaker is 800-1500 RPM, for example, 800 RPM, 900 RPM, or 1200 RPM.

[0050] The scrambler mechanically separates the wool at an appropriate speed, removing entanglements and adhesions between fibers to produce a loose, fibrous material. This scrambler fully unfolds the fibers, increasing their surface area and exposing more active sites, facilitating subsequent uniform mixing with the polymer.

[0051] Selecting the appropriate rotation speed can avoid excessive mechanical stress, prevent fiber breakage or damage, and maintain fiber length and integrity. The loose fiber state helps to fully contact with the dispersed polymer, ensuring uniform distribution of fibers and polymer during the modification process.

[0052] S1.3. Pre-treating the polymer to obtain a dispersed polymer.

[0053] Pretreatment (such as dissolution, emulsification or ultrasonic dispersion) transforms the polymer from agglomerated state into fine dispersed particles or solution, increasing its contact area with the fiber. The dispersed polymer is more likely to penetrate between wool fibers, promoting physical or chemical bonding between the polymer and the fiber surface.

[0054] Well-dispersed polymers help form a uniform polymer network between fibers, improving the mechanical and functional properties of composite materials. Dispersed polymers also offer improved fluidity and stability, facilitating uniform mixing with fibers and reducing processing complexity.

[0055] S1.4. Evenly mix the wool fibers and the dispersed polymer to obtain modified wool, wherein the weight ratio of the dispersed polymer to the wool fibers is 2 to 3:25, for example, 2:25 or 3:25.

[0056] Mixing the polymer by weight ensures the right amount of bonding and coating between the fibers, ensuring the fibers remain soft while enhancing the material's performance. The polymer acts as a binder, filling the gaps between the fibers and strengthening the bond between them, ultimately increasing the overall strength and stability of the composite.

[0057] The introduction of polymers can impart new functional properties to modified wool, such as increased elasticity, enhanced abrasion resistance, and improved flame retardancy. Modified wool fibers exhibit enhanced thermoplastic or thermosetting properties, facilitating subsequent processing such as spinning, weaving, or thermoforming. By adjusting the polymer-to-fiber ratio, material properties such as hardness, elasticity, and hygroscopicity can be precisely controlled to meet specific application requirements.

[0058] S2. flocculating the modified wool to obtain modified wool flocculent.

[0059] Use an opener or carding machine to further disperse and comb the modified wool fibers to form a uniform floc. The opener further opens the fiber bundles through mechanical action, removing the entanglements between the fibers and forming a loose fiber state.

[0060] Adjust the speed and opening force of the opener. Generally, the speed of the opener can be set at 1000~1500 RPM to ensure that the fibers are not cracked or damaged.

[0061] The opened fibers are further combed through a carding machine to make them straighter and more evenly distributed, facilitating subsequent flocculation.

[0062] Air jet or mechanical shaking can be used to make the fibers settle randomly in the air, forming fluffy flocs. Adjusting parameters such as wind speed and vibration frequency can control the density and thickness of the flocs and ensure the uniformity of the flocs.

[0063] Modified wool flocculents produced through flocculation possess numerous tiny air gaps. The low thermal conductivity of air provides the material with excellent thermal insulation properties. The flocculent structure adds volume and thickness to the material, further enhancing its thermal insulation. The flocculated fibers are loose and soft to the touch, enhancing the material's comfort and making it suitable for next-to-skin wear. The fluffy flocculent structure exhibits excellent elasticity and quickly returns to its original shape after compression, increasing the material's durability.

[0064] The flocculated material can be directly laminated and hot-pressed with non-woven fabrics, films, and other materials to produce composite fabrics. The flocculated modified wool fiber has good processability and is suitable for a variety of processing techniques such as needling, hot pressing, and sewing.

[0065] S3. Place the nonwoven fabric in a deposition device for metal deposition to obtain a surface sheet. Depositing a metal nanolayer on the surface of the nonwoven fabric significantly increases the material's reflectivity to infrared light. This high reflectivity effectively blocks the transfer of thermal radiation, reducing heat loss or absorption, thereby improving the material's thermal insulation or heat-insulating properties. The presence of the metal nanolayer gives the material the ability to selectively reflect and emit thermal radiation, optimizing the material's thermal management properties and making it suitable for applications requiring heat shielding or insulation.

[0066] The specific steps for S3 are as follows:

[0067] S3.1. Clean the surface of the non-woven fabric.

[0068] A clean nonwoven surface facilitates better adhesion of metal vapor during deposition, forming a strong, uniform metal nanolayer. A clean surface prevents bubbles, voids, or uneven layers during deposition, ensuring the continuity and integrity of the metal nanolayer. Nonwoven materials can be made from natural fibers, such as cotton and bamboo fiber, or bio-based materials, such as polylactic acid, polyhydroxyalkanoates, and chitosan.

[0069] S3.2. Select a metal material and perform high-temperature vaporization to obtain metal vapor. In one embodiment, the metal material comprises 80-90% aluminum and 10-20% magnesium, calculated by weight. For example, the metal material may be 90% aluminum and 10% magnesium.

[0070] Selecting the appropriate metal material and vaporization conditions helps control the particle size of the metal nanoparticles, affecting the physical and chemical properties of the final deposited layer. The high-temperature vaporization process is carried out in a controlled environment, reducing the content of impurities and oxides in the metal vapor, ensuring the purity and performance of the deposited layer.

[0071] Stable vaporization conditions ensure uniformity of the metal vapor, which is conducive to the formation of a consistent deposition layer. Appropriate vaporization temperature and metal selection can increase the concentration of metal vapor, increase the deposition rate, and improve production efficiency.

[0072] S3.3. Place the cleaned nonwoven fabric in a reactor, introduce inert gas and metal vapor for deposition, and cool to obtain a surface sheet. Deposition under controlled conditions allows the metal nanoparticles to penetrate deeply into the nonwoven fabric's fiber structure, forming a mechanical bond that enhances adhesion and prevents flaking of the metal layer.

[0073] The steps in S3.3 are as follows:

[0074] The cleaned nonwoven fabric is placed in a reaction kettle, and then the reaction kettle is vacuumed and inert gas is introduced.

[0075] The air in the reactor is evacuated to reduce the oxygen and moisture content, preventing oxidation of the metal vapor during deposition and ensuring the purity and performance of the metal layer. An inert gas (such as nitrogen or argon) is introduced to create an oxygen-free and water-free inert environment, further preventing the metal vapor from reacting with oxygen or moisture.

[0076] Inert gas provides a stable, clean deposition environment, helping metal nanoparticles deposit evenly on the nonwoven surface. The oxygen-free environment reduces the formation of metal oxides, allowing the metal nanoparticles to better bond with the nonwoven fibers, forming a strong metal layer. Vacuuming and introducing inert gas removes impurities and contaminants from the air, preventing them from entering the material during the deposition process and affecting product quality.

[0077] First, metal vapor is introduced to form a metal nano-deposition layer, and then polyvinyl alcohol or sodium chloride solution is added. After drying, a removable layer covering the metal nano-deposition layer is formed.

[0078] The introduction of metal vapor forms a layer of metal nanoparticles on the surface of the non-woven fabric. The metal nanolayer provides high reflectivity, electrical conductivity, antibacterial properties and other functions, improving the overall performance of the material.

[0079] Polyvinyl alcohol or sodium chloride solution is added and dried to form a removable layer, which covers the deposited metal nanolayer. The removable layer acts as a barrier, preventing subsequent deposited metal layers from coming into direct contact with the existing metal layer, ensuring the independence and integrity of each metal nanolayer. By alternating the deposition of metal and removable layers, the thickness and spacing of each layer can be precisely controlled, thereby adjusting the porosity and pore size of the overall material.

[0080] The metal nano-deposition layer and the removable layer are deposited alternately, and the process stops after a preset number of deposition alternations is reached.

[0081] When metal nanoparticles are deposited on the surface of nonwoven fabrics, they partially fill the fabric's tiny pores without completely blocking larger pores, thereby maintaining a certain degree of air permeability. The deposition of the metal nanolayer may form a discontinuous coating on the fiber surface, preserving nanoscale pore channels and helping to adjust the material's moisture and air permeability.

[0082] Properly maintaining porosity can reduce stress concentration, prevent crack formation and expansion, and increase material durability. Optimizing the pore structure helps improve the material's toughness and elasticity, preventing excessive brittleness. It also enhances the material's barrier to dust, bacteria, and liquids, improving its waterproof, dustproof, and antibacterial properties. By controlling porosity, the material's thermal insulation, breathability, and protective properties are enhanced, making it suitable for applications such as high-end thermal insulation fabrics, functional textiles, and medical protective materials, with broad market prospects.

[0083] The non-woven fabric after deposition is immersed in deionized water, and is heated, stirred, washed, dried, and cooled in sequence to obtain a surface sheet, wherein the heating temperature is 40-60°C.

[0084] Polyvinyl alcohol and sodium chloride are highly soluble in water. The material is immersed in deionized water, where heating and stirring dissolve and remove the removable layer. After removing the isolation layer, the multilayer metal nanodeposition layer remains, forming a continuous nanometal structure that imparts the desired functional properties to the material.

[0085] The removable layer forms a uniform covering on the metal nanolayer, with its thickness and uniformity precisely controlled by the solution concentration and coating process. This layer, when subsequently removed, leaves pores or gaps in its place, thereby regulating the material's porosity and pore size.

[0086] The thickness of the removable layer is typically in the nanometer to micrometer range. After removal, nanoscale pores are formed between the metal nanolayers. The size and distribution of these pores can be precisely adjusted by controlling the thickness of the removable layer and the number of coatings.

[0087] After removing the removable layer, the total porosity of the material increases, and air and water vapor can be freely transmitted through these nano-scale pores, improving the air permeability and moisture permeability of the material and enhancing wearing comfort.

[0088] Without a removable layer, multiple metal depositions could make the material too dense, reducing its softness and elasticity. The introduction of a removable layer creates pores between the metal layers, preventing the material from overhardening and maintaining its softness and mechanical flexibility.

[0089] The heating temperature is 40-60°C, for example, 40°C, 50°C, or 60°C. This temperature range effectively dissolves the removable layer while preserving the integrity and stable performance of the material. Mild heating conditions avoid thermal stress and performance degradation caused by high temperatures. Appropriate drying and cooling steps restore the nonwoven fabric's softness and feel, ensuring the material's comfort and workability.

[0090] In other embodiments, the non-woven fabric after deposition is placed in an oven or furnace and heated to 200-400° C. for 30 minutes to 1 hour to decompose or volatilize the removable layer, leaving the metal nanolayers.

[0091] In this embodiment, a rotating plate can be installed inside the reactor, and the non-woven fabric can be placed on the rotating plate. The rotating plate is used to adjust the non-woven fabric's horizontal rotation and tilt. By adjusting the tilt angle of the non-woven fabric with respect to the horizontal plane, the tilted deposition angle of the metal nanolayer is adjusted, thereby controlling the porosity of each metal nanolayer. The porosity calculation formula of the metal nanolayer on the non-woven fabric is obtained as follows:

[0092] ;

[0093] in, , , is the total porosity of the entire metal nanolayer, is the structural porosity between multiple metal nanolayers, is the thickness of the removable layer, 20~200nm, is the thickness of a single metal nanolayer, 10~100nm, is the monolayer porosity of a single metal nanolayer, is the tilted deposition angle of the metal nanolayer, is 45~80°, if When the angle is 0°, the deposition direction remains perpendicular to the plane extension direction of the nonwoven fabric.

[0094] For applications requiring thermal insulation, appropriately increasing porosity can improve thermal insulation performance because the presence of air in the material reduces heat conduction. Furthermore, porosity directly affects the material's air and liquid permeability. A higher porosity allows air and liquid to pass more easily through the wool composite fabric, which is desirable in certain applications, such as medical materials (such as dressings), where breathability enhances comfort and allows for moisture vapor removal.

[0095] S4, assembling the modified wool flocculent and the surface sheet to obtain a wool composite fabric.

[0096] By filling the interior spaces of the surface sheet with modified wool flocculent, the fabric achieves excellent thermal insulation. The natural curl and bulk of wool fibers create a large layer of still air, reducing heat conduction and loss. The highly reflective metal nanolayer (such as aluminum and magnesium) on the surface sheet effectively reflects infrared heat radiation from the human body and the outside world, further reducing heat loss and enhancing the fabric's thermal performance.

[0097] Modified wool flocculent is firmly bonded to the surface sheet to form a multi-layer composite structure. This structure improves the fabric's tensile and tear resistance, enhancing its overall durability. The assembled fabric is structurally stable, maintaining its shape and thickness over long-term use, preventing filler shifting or aggregation and ensuring consistent fabric performance.

[0098] The use of biodegradable polymers (such as poly-L-lactic acid) in modified wool flocs reduces the environmental impact of the fabric at the end of its life, meeting the requirements of environmental protection and sustainable development. Wool is a renewable resource, and the combination of this environmentally friendly polymer embodies the efficient use of materials and green manufacturing concepts.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wool composite fabric, characterized in that: include: A surface sheet and a filler disposed in an interior space of the surface sheet, wherein the filler comprises modified wool flocculent, and the surface sheet comprises a non-woven fabric layer and a metal nano-deposition layer deposited on a surface of the non-woven fabric layer; The preparation steps of the surface sheet include: The cleaned nonwoven fabric is placed in a reaction kettle, and the reaction kettle is evacuated and an inert gas is introduced; First, metal vapor is introduced to form a metal nano-deposition layer, and then polyvinyl alcohol or sodium chloride solution is added, and after drying, a removable layer covering the metal nano-deposition layer is formed; Alternately depositing the metal nano-deposition layer and the removable layer, and stopping after a preset number of alternating deposition times is reached; The non-woven fabric after deposition is immersed in deionized water, and is heated, stirred, washed, dried, and cooled in sequence to obtain the surface sheet, wherein the heating temperature is 40-60°C.

2. The wool composite fabric according to claim 1, characterized in that: The modified wool flocculent includes a polymer and wool fibers, wherein the polymer includes at least one of poly (L-lactic acid), polyvinyl alcohol, polycaprolactone, polyurethane, polylactic acid-caprolactone copolymer, and polybutylene succinate, the diameter of the wool fibers is 18 to 22 μm, and the diameter-to-length ratio of the wool fibers is 1:100 to 300.

3. The wool composite fabric according to claim 1 or 2, characterized in that: The metal nano-deposition layer includes at least one of aluminum, magnesium, titanium, and copper, and the metal particle size of the metal nano-deposition layer is 5-80 nm.

4. A preparation method, characterized in that: For preparing the wool composite fabric according to any one of claims 1 to 3, the preparation method comprises the following steps: S1. Modifying wool; S2, flocculating the modified wool to obtain a modified wool flocculent; S3, placing the nonwoven fabric in a deposition device and performing metal deposition treatment to obtain a surface sheet; S4. Assembling the modified wool flocculent and the surface sheet to obtain the wool composite fabric.

5. The preparation method according to claim 4, characterized in that Step S1 includes: S1.

1. Add the wool raw material to a weak alkaline solution for washing; S1.

2. The cleaned wool raw material is subjected to a beating machine to be broken up to obtain wool fibers, wherein the rotation speed of the beating machine is 800-1500 RPM; S1.3, pretreating the polymer to obtain a dispersed polymer; S1.

4. Uniformly mixing the wool fiber and the dispersed polymer to obtain modified wool, wherein the weight ratio of the dispersed polymer to the wool fiber is 2-3:

25.

6. The preparation method according to claim 4, characterized in that Step S3 includes: S3.

1. Clean the surface of the non-woven fabric; S3.

2. Select a metal material and perform high-temperature vaporization to obtain metal vapor; S3.

3. Place the cleaned nonwoven fabric in a reactor, introduce inert gas and the metal vapor to perform deposition, and obtain the surface sheet after cooling.

7. The preparation method according to claim 6, characterized in that Step S3.3 includes: The cleaned nonwoven fabric is placed in a reaction kettle, and the reaction kettle is evacuated and an inert gas is introduced; First, the metal vapor is introduced to form a metal nano-deposition layer, and then polyvinyl alcohol or sodium chloride solution is added, and after drying, a removable layer covering the metal nano-deposition layer is formed; Alternately depositing the metal nano-deposition layer and the removable layer, and stopping after a preset number of alternating deposition times is reached; The non-woven fabric after deposition is immersed in deionized water, and is heated, stirred, washed, dried, and cooled in sequence to obtain the surface sheet, wherein the heating temperature is 40-60°C.

8. The preparation method according to claim 6, characterized in that Calculated by weight percentage, the metal material includes 80-90% aluminum and 10-20% magnesium.

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