Wool composite fabric and preparation method thereof

Abstract

The invention provides a wool composite fabric and a preparation method thereof.The wool composite fabric comprises a surface sheet and filler arranged in the inner space of the surface sheet, the filler comprises modified wool flocculate, and the surface sheet comprises a non-woven fabric layer and a metal nano layer deposited on the surface of the non-woven fabric layer. By combining the modified wool flocculate, the non-woven fabric layer and the metal nano layer, 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 requiring constant temperature and cold protection. And the wool composite fabric obviously reduces the influence on the environment. In the whole life cycle from raw material acquisition, production, manufacturing and use to final waste, the environment-friendly concept is embodied, the method has important ecological benefits and social values, and positive contributions are made to development of green textiles.

Description

Technical Field

[0001] The 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 industries such as industry and medicine. Thermal insulation fabrics use a variety of different materials. In industry, many pipes and equipment need to maintain a specific temperature in a low-temperature environment, such as chemical equipment, liquid pipelines, storage tanks, etc. Thermal insulation fabrics are used as insulation layers for equipment to ensure temperature stability, reduce energy loss, and improve equipment efficiency. In the field of medical applications, thermal insulation fabrics are used in beds, operating tables, etc. to help patients maintain body temperature, especially when the body temperature is unstable after surgery or during treatment.

[0003] The thermal insulation fabrics in the related art are mainly made of synthetic fibers. On the one hand, the thermal insulation performance of synthetic fibers will be significantly reduced in a wet and cold environment. This is because synthetic fibers usually have higher thermal conductivity and are easier to transfer heat, which will cause the heat to be transferred to the outside through the fabric faster, making it difficult to keep warm.

[0004] On the other hand, many current thermal insulation fabrics also have major problems in terms of environmental protection. Synthetic fibers such as polyester and acrylic are difficult to degrade naturally and may remain in the environment for a long time after being discarded, causing white pollution. The production process of synthetic materials not only consumes a lot of energy, but also produces a lot 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 flocculant 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 18~22μm, and the diameter and length ratio of the wool fibers is 1:100~300.

[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 steps of the preparation method include: S1. Modifying the wool; S2, flocculating the modified wool to obtain a modified wool flocculate; S3, placing the nonwoven in a deposition device, performing a metal deposition process, and obtaining a surface sheet; S4, assembling the modified wool flocculent and the surface sheet to obtain the wool composite fabric.

[0010] In some embodiments of the present invention, step S1 comprises: S1.1, adding the wool raw material into a weak alkaline solution for washing; S1.2, the wool raw material after washing is broken up by a break-up machine to obtain wool fiber, wherein the rotation speed of the break-up machine is 800-1500RPM; S1.3, pretreating the polymer to obtain a dispersed polymer; S1.4. Evenly mix 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.

[0011] In some embodiments of the present invention, step S3 includes: S3.1. Clean the surface of the non-woven fabric; S3.2, selecting a metal material and performing high-temperature vaporization to obtain metal vapor; S3.3, placing the cleaned nonwoven fabric in a reaction kettle, introducing an inert gas and the metal vapor for deposition, and obtaining the surface sheet after cooling.

[0012] In some embodiments of the present invention, 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; Firstly, 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 reaching a preset number of alternating deposition times; 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.

[0013] In some embodiments of the present invention, the metal material includes 80-90% aluminum and 10-20% magnesium by weight.

[0014] Compared with the prior art, the wool composite fabric and the preparation method thereof in the present invention have the following beneficial effects: By combining modified wool flocculent, non-woven fabric layer and 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. In addition, the wool composite fabric significantly reduces the impact on the environment. From the acquisition of raw materials, production and manufacturing, use to final disposal, the entire life cycle reflects the concept of environmental protection, has important ecological benefits and social value, and has made positive contributions to the development of green textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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.

[0017] 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 nano-layer deposited on the surface of the non-woven fabric layer.

[0018] Wool itself has good thermal insulation properties because its fiber curling structure can capture a large amount of air and form an insulating layer. The fiber gaps of the modified wool flocs may be further optimized, which enhances the air retention capacity and improves the thermal insulation effect. Wool fibers can absorb moisture without appearing damp. During the moisture absorption process, wool releases heat (hygroscopic heat release), thereby increasing the temperature of the fabric and helping to keep warm in cold environments. The filler forms multiple air layers inside the surface sheet. The air has a low thermal conductivity and can effectively block heat conduction. Biodegradable polymers such as poly-L-lactic acid (PLA) and polycaprolactone (PCL) are used in modified wool flocs. These materials can be decomposed by microorganisms in the natural environment and eventually converted into carbon dioxide and water, without polluting the environment.

[0019] The metal nanolayer deposited on the surface of the non-woven fabric has a high reflectivity, especially for infrared (heat radiation). This means that external heat radiation is difficult to enter the fabric, and the internal heat is not easy to dissipate. At the same time, the size of the metal nanoparticles is at the nanometer level, which can resonate with the infrared wavelength, enhance the reflection and scattering ability of infrared rays, form a heat insulation barrier, slow down the exchange of internal and external heat, and thus maintain the temperature.

[0020] By combining modified wool flocculent, non-woven fabric layer and metal nanolayer, the wool composite fabric achieves multiple temperature control mechanisms, including heat conduction inhibition, heat radiation reflection, moisture absorption and heat release, and convection blocking. Moreover, the wool composite fabric significantly reduces the impact on the environment. From the acquisition of raw materials, production and manufacturing, use to final disposal, the entire life cycle reflects the concept of environmental protection, has important ecological benefits and social value, and has made positive contributions to the development of green textiles.

[0021] 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 18-22 μm, and the diameter-to-length ratio of the wool fibers is 1:100-300.

[0022] The wool fiber has a diameter of 18-22 μm, such as 19 μm or 20 μm, and has good strength and flexibility. The diameter-to-length ratio is 1:100-300, such as 1:100, 1:200, or 1:300. The high aspect ratio allows the fiber to form a three-dimensional network structure in the material, increasing the air content inside the material, further improving the thermal insulation performance, and significantly improving the tensile strength and tear resistance of the material.

[0023] Wool fibers serve as the reinforcing phase and polymers serve as the matrix, which work together to form a composite material. The three-dimensional network structure of the fibers and the bonding effect of the polymers jointly improve the mechanical properties of the material. Wool fibers with a high aspect ratio are easy to disperse evenly in the polymer matrix to form a stable fiber network structure, which improves the uniformity and quality stability of the material. Polymers such as poly-L-lactic acid, polyvinyl alcohol, polycaprolactone, and polyurethane form a good interface bond with wool fibers, which enhances the bonding force between fibers and improves the overall mechanical properties of the composite material.

[0024] The metal nanolayer includes at least one of aluminum, magnesium, titanium and copper, and the metal particle size of the metal nanolayer is 5-80nm, for example, 40nm or 50nm.

[0025] The metal nanolayer has a high reflectivity to infrared rays, can effectively reflect thermal radiation, reduce the entry of external heat, and maintain a stable temperature inside the fabric. This is crucial for thermal insulation materials, especially in cold environments. The metal nanolayer can improve the stability of the material in a high temperature environment, prevent the material from deforming or losing performance due to high temperature, and is suitable for applications under extreme temperature conditions. The nano-sized metal layer forms a protective film on the surface, which significantly improves the material's oxidation resistance and corrosion resistance, and extends its service life. This is especially important for the application of fabrics in humid or corrosive environments.

[0026] Please refer to Figure 1 The present invention proposes a preparation method for preparing a wool composite fabric, and the steps of the preparation method include: S1. Modify the wool. Modifying the wool can significantly improve the performance of wool fibers, thereby enhancing the overall performance of wool composite fabrics.

[0027] The specific steps are as follows: S1.1. Add the wool raw material into a weak alkaline solution for washing.

[0028] Wool raw materials usually contain impurities such as lanolin, sweat, dust, etc. Weak alkaline solutions (such as diluted sodium hydroxide or sodium carbonate solutions) can effectively dissolve and remove these impurities, making the wool fibers cleaner.

[0029] 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.

[0030] The fiber surface is more active after cleaning, 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.

[0031] S1.2, the wool raw material after washing is broken up by a break-up machine to obtain wool fibers, wherein the rotation speed of the break-up machine is 800-1500RPM, for example, 800RPM, 900RPM, 1200RPM.

[0032] The scrambler mechanically separates the wool at an appropriate speed, removes the entanglement and adhesion between the fibers, and obtains loose fibrous materials. The scrambler fully spreads the fibers, increases the specific surface area of ​​the fibers, exposes more active sites, and is conducive to subsequent uniform mixing with the polymer.

[0033] Selecting the right 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 polymers during the modification process.

[0034] S1.3. Pretreat the polymer to obtain a dispersed polymer.

[0035] Pretreatment (such as dissolution, emulsification or ultrasonic dispersion) transforms the polymer from agglomerated state into fine dispersed particles or solutions, increasing its contact area with the fiber. Dispersed polymers are more likely to penetrate between wool fibers, promoting the physical or chemical bonding of the polymer with the fiber surface.

[0036] Well-dispersed polymers help form a uniform polymer network between fibers, improving the mechanical properties and functional characteristics of composite materials. Dispersed polymers have better fluidity and stability, making them easier to mix evenly with fibers and reducing processing difficulties.

[0037] S1.4, uniformly mixing wool fibers and dispersed polymers to obtain modified wool, wherein the weight ratio of dispersed polymers to wool fibers is 2 to 3:25, for example, 2:25 or 3:25.

[0038] Mixing according to the weight ratio ensures that the polymer forms an appropriate amount of bonding and coating between the fibers, which does not affect the softness of the fibers and can enhance the material performance. The polymer acts as a binder, filling the gaps between the fibers, enhancing the bonding force between the fibers and improving the overall strength and stability of the composite material.

[0039] The introduction of polymers can give modified wool new functional properties, such as improved elasticity, enhanced wear resistance, improved flame retardancy, etc. The modified wool fiber has better thermoplasticity or thermosetting properties, which is convenient for subsequent molding processes, such as spinning, weaving or hot pressing. By adjusting the ratio of polymer to fiber, the properties of the material, such as hardness, elasticity, hygroscopicity, etc., can be precisely controlled to meet specific application requirements.

[0040] S2, flocculating the modified wool to obtain modified wool flocculation.

[0041] The modified wool fibers are further dispersed and combed using an opener or a carding machine to form a uniform flocculent. The opener further opens the fiber bundles through mechanical action, removes the entanglement between the fibers, and forms a loose fiber state.

[0042] 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.

[0043] The loosened fibers are further combed through a carding machine to make them straighter and more evenly distributed, which is convenient for subsequent flocculation.

[0044] The air jet or mechanical shaking method can be used to make the fibers settle randomly in the air to form fluffy flocs. The wind speed, vibration frequency and other parameters can be adjusted to control the density and thickness of the flocs and ensure the uniformity of the flocs.

[0045] The modified wool flocculent formed by flocculation has a large number of tiny air gaps, and the low thermal conductivity of air makes the material have excellent thermal insulation performance. The flocculent structure makes the material more fluffy, increases the thickness, and further improves the thermal insulation effect. The fiber structure after flocculation is loose, soft and comfortable to the touch, which improves the comfort of the material and is suitable for textiles worn next to the body. The fluffy flocculent structure has good elasticity and can quickly return to its original shape after being compressed, which increases the durability of the material.

[0046] The flocculated material can be directly used for lamination and hot pressing with non-woven fabric layers, films and other materials to prepare composite fabrics. The modified wool fiber after flocculation has good processability and is suitable for a variety of processing techniques such as needle punching, hot pressing, and sewing.

[0047] S3. Place the nonwoven fabric in a deposition device and perform metal deposition treatment to obtain a surface sheet. Depositing a metal nanolayer on the surface of the nonwoven fabric can significantly increase the reflectivity of the material to infrared rays. This high reflectivity can effectively prevent the transfer of thermal radiation, reduce heat loss or absorption, and thus improve the thermal insulation or heat insulating properties of the material. The presence of the metal nanolayer enables the material to selectively reflect and emit thermal radiation, optimizes the thermal management performance of the material, and is suitable for application scenarios that require heat shielding or heat preservation.

[0048] The specific steps of S3 are as follows: S3.1. Clean the surface of the non-woven fabric.

[0049] A clean non-woven surface helps the metal vapor adhere better during the deposition process, forming a strong and uniform metal nanolayer. Surface cleaning can prevent bubbles, voids or uneven layers from forming during the deposition process, ensuring the continuity and integrity of the metal nanolayer. The non-woven material can be natural fibers, such as cotton, bamboo fiber, etc., or bio-based materials, such as polylactic acid, polyhydroxyalkanoates, chitosan, etc.

[0050] S3.2, select a metal material and perform high-temperature vaporization to obtain metal vapor. In one embodiment, the metal material includes 80-90% aluminum and 10-20% magnesium by weight. For example, it can be 90% aluminum and 10% magnesium.

[0051] Selecting the right metal material and vaporization conditions helps control the particle size of metal nanoparticles and affects the physical and chemical properties of the final deposited layer. The high-temperature vaporization process is carried out in a controlled environment, which reduces the content of impurities and oxides in the metal vapor and ensures the purity and performance of the deposited layer.

[0052] Stable vaporization conditions ensure the uniformity of metal vapor and are 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.

[0053] S3.3, place the cleaned nonwoven in a reactor, introduce inert gas and metal vapor for deposition, and obtain a surface sheet after cooling. Deposition is carried out under a controlled environment, and the metal nanoparticles can penetrate deeply into the fiber structure of the nonwoven, forming a mechanical interlocking, enhancing adhesion, and preventing the metal layer from peeling off.

[0054] S3.3 The specific steps are as follows: The cleaned nonwoven fabric is placed in a reaction kettle, and then the reaction kettle is evacuated and an inert gas is introduced.

[0055] The air in the reactor is extracted to reduce the oxygen and moisture content, prevent the metal vapor from being oxidized during the deposition process, and ensure the purity and performance of the metal layer. Inert gas (such as nitrogen or argon) is introduced to establish an oxygen-free and water-free inert environment to further prevent the metal vapor from reacting with oxygen or moisture.

[0056] Inert gas provides a stable and clean deposition environment, which helps metal nanoparticles to deposit evenly on the surface of non-woven fabrics. The oxygen-free environment reduces the formation of metal oxides, and metal nanoparticles can better combine with non-woven fabric fibers to form a strong metal layer. Vacuuming and introducing inert gas can remove impurities and pollutants in the air, preventing them from entering the material during the deposition process and affecting product quality.

[0057] Firstly, 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.

[0058] Metal vapor is introduced to form a layer of metal nanoparticles on the surface of the non-woven fabric. The metal nanolayer provides functions such as high reflectivity, conductivity, and antibacterial properties, improving the overall performance of the material.

[0059] Add polyvinyl alcohol or sodium chloride solution and dry to form a removable layer, which covers the metal nano-deposition layer. The removable layer acts as an isolation layer to prevent the subsequent deposited metal layer from directly contacting the existing metal layer, ensuring the independence and integrity of each metal nano-layer. By alternately depositing metal layers 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.

[0060] The metal nano-deposition layer and the removable layer are deposited alternately, and the deposition stops after reaching a preset number of deposition alternations.

[0061] When metal nanoparticles are deposited on the surface of nonwoven fabrics, they partially fill the tiny pores of the nonwoven fabrics, but do not completely block the larger pores, thus maintaining a certain degree of air permeability. The deposition of metal nanolayers may form a discontinuous coverage on the fiber surface, retaining the nanoscale pore channels, which helps to regulate the moisture permeability and air permeability of the material.

[0062] Proper retention of porosity can reduce stress concentration, prevent the generation and expansion of cracks, and increase the durability of materials. Optimization of pore structure helps to improve the toughness and elasticity of materials and prevent them from becoming too brittle. At the same time, it also enhances the material's ability to block dust, bacteria and liquids, and improves its waterproof, dustproof and antibacterial properties. By controlling the porosity, the material's thermal insulation, breathability, and protection properties are improved, making it suitable for high-end thermal insulation fabrics, functional textiles, medical protective materials and other fields, and has broad market application prospects.

[0063] 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.

[0064] Polyvinyl alcohol and sodium chloride have good solubility in water. The material is immersed in deionized water and the removable layer is dissolved and removed by heating and stirring. After removing the isolation layer, multiple metal nano-deposition layers are retained to form a continuous nano-metal structure, giving the material the expected functional properties.

[0065] The removable layer forms a uniform covering on the metal nanolayer, and its thickness and uniformity can be precisely controlled by solution concentration and coating process. This layer, when subsequently removed, leaves pores or gaps in their original locations, thereby adjusting the porosity and pore size of the material.

[0066] The thickness of the removable layer is usually in the range of nanometers to micrometers, and 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.

[0067] After removing the removable layer, the total porosity of the material increases, and air and water vapor can be transmitted freely through these nanoscale pores, improving the air permeability and moisture permeability of the material and enhancing wearing comfort.

[0068] Without a removable layer, multiple metal depositions may make the material too dense, reducing softness and elasticity. The introduction of a removable layer forms pores between the metal layers, preventing the material from over-hardening and maintaining its softness and mechanical flexibility.

[0069] The heating temperature is 40-60°C, for example, 40°C, 50°C, 60°C. This temperature range can effectively dissolve the removable layer without damaging the non-woven fabric substrate and the metal nanolayer, maintaining the integrity and stable performance of the material. Mild heating conditions avoid thermal stress and performance degradation caused by high temperature to the material. Appropriate drying and cooling steps restore the softness and feel of the non-woven fabric, ensuring the comfort and processability of the material.

[0070] 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 spaced metal nanolayers.

[0071] In this embodiment, a rotating plate can be set 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 to rotate and tilt in the horizontal direction. The tilted deposition angle of the metal nanolayer is adjusted by adjusting the tilt angle of the non-woven fabric with the horizontal plane, thereby controlling the porosity of each metal nanolayer. The porosity calculation formula of the metal nanolayer on the non-woven fabric is obtained: ; 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.

[0072] For applications that require thermal insulation, properly increasing the porosity has better thermal insulation performance because the presence of air in the material can reduce heat conduction. And the porosity directly affects the air permeability and liquid permeability of the material. Larger porosity allows air and liquid to pass through the wool composite fabric more easily, which is required in some applications, such as medical materials (such as dressings), where breathability can enhance comfort and moisture discharge.

[0073] S4, assembling the modified wool flocculent and the surface sheet to obtain a wool composite fabric.

[0074] By filling the internal space of the surface sheet with modified wool flocculent, the fabric achieves excellent thermal insulation. The natural curl and fluffiness of wool fibers form a large amount of static air layer, reducing the conduction and loss of heat. The metal nanolayer (such as aluminum, magnesium, etc.) on the surface sheet has a high reflectivity and can effectively reflect infrared heat radiation from the human body and the outside world, further reducing heat loss and improving the thermal insulation performance of the fabric.

[0075] The modified wool flocculent is firmly combined with the surface sheet to form a multi-layer composite structure. This structure improves the tensile and tear resistance of the fabric and enhances the overall durability of the fabric. The assembled fabric structure is stable and can maintain its shape and thickness during long-term use, avoiding the displacement or aggregation of the filler and ensuring the consistency of the fabric performance.

[0076] Biodegradable polymers (such as poly-L-lactic acid) are used in modified wool flocs, which reduces the impact of the fabric on the environment after its service life, meeting the requirements of environmental protection and sustainable development. Wool is a renewable resource, and combined with environmentally friendly polymers, it embodies the efficient use of materials and the concept of green manufacturing.

[0077] 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 protection scope of the present invention.

Claims

1. A wool composite fabric, characterized in that: include: A surface sheet and a filler arranged in the inner 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-layer deposited on the surface of the non-woven fabric layer.

2. The wool composite fabric according to claim 1, characterized in that: The modified wool flocculent comprises a polymer and wool fibers, wherein the polymer comprises 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 18-22 μm, and the ratio of the diameter to the length of the wool fibers is 1:100-300.

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

4. A preparation method, characterized in that: Used to prepare 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 flocculate; S3, placing the nonwoven in a deposition device, performing a metal deposition process, and obtaining 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: The step S1 comprises: S1.1, adding the wool raw material into a weak alkaline solution for washing; S1.2, the wool raw material after washing is broken up by a break-up machine to obtain wool fiber, wherein the rotation speed of the break-up machine is 800-1500RPM; S1.3, pretreating the polymer to obtain a dispersed polymer; S1.

4. Evenly mix 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: The step S3 comprises: S3.

1. Clean the surface of the non-woven fabric; S3.2, selecting a metal material and performing high-temperature vaporization to obtain metal vapor; S3.3, placing the cleaned nonwoven fabric in a reaction kettle, introducing an inert gas and the metal vapor for deposition, and obtaining the surface sheet after cooling.

7. The preparation method according to claim 6, characterized in that: The step S3.3 comprises: The cleaned nonwoven fabric is placed in a reaction kettle, and the reaction kettle is evacuated and an inert gas is introduced; Firstly, 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 reaching a preset number of alternating deposition times; 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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