Wool antibacterial quilt core material and preparation method thereof

Abstract

This invention discloses a wool antibacterial comforter core material and its preparation method. The material involves removing the tips of wool scales through microwave treatment and then wrapping the wool with polylactic acid (PLA) fibers during spinning. It employs a three-layer composite antibacterial design using zinc oxide, nano-silver, and quaternary ammonium salts. Through photocatalysis, silver ion release, and positive charge adsorption, it achieves broad-spectrum and highly efficient antibacterial properties, solving the problem of single antibacterial agents easily becoming ineffective. The material maintains its antibacterial performance even after long-term use, preserving the comfortable feel and breathability of natural fibers while avoiding the stiffness and stuffiness of synthetic fibers. It simultaneously enhances antibacterial properties and moisture-wicking advantages, comprehensively addressing the core issues of insufficient softness and antibacterial properties in wool comforters. The natural crimp of wool fibers combined with the straightness of PLA fibers allows the composite yarn to maintain its crispness while providing a softer feel, making the comforter core material more comfortable against the skin. Reduced inter-fiber friction and improved overall softness after web laying and shaping achieve a balance between the warmth of wool and the softness of PLA.

Description

Technical Field

[0001] This invention relates to a method for preparing a comforter core material, and more particularly to a wool antibacterial comforter core material and its preparation method. Background Technology

[0002] The use of wool comforter fillings stems from the unique advantages of its natural fibers and the evolution of market demand. Wool, as a traditional insulating material, possesses excellent warmth and breathability thanks to the air layer formed by its naturally crimped structure. Its renewable and biodegradable properties align with environmental trends, allowing it to long dominate the bedding market. However, traditional wool comforters have gradually revealed three major pain points in actual use: First, the scaly structure of wool fibers results in greater rigidity, which can easily cause itching upon friction, making it less comfortable against the skin than synthetic fibers; second, wool has strong moisture absorption but weak moisture wicking, making it prone to bacterial growth in damp environments, leading to odors or skin allergies.

[0003] As consumers demand higher sleep quality, the market urgently needs wool comforters that combine the advantages of natural fibers with functional improvements. Therefore, it is necessary to improve existing methods for preparing wool comforter materials. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a wool antibacterial quilt core material and its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a method for preparing a wool antibacterial quilt core material, comprising the following steps:

[0006] S1: Barium titanate powder, coupling agent and nano silica are ball-milled and mixed to obtain mixed particles. The mixed particles are placed in water and stirred to obtain a nano barium titanate suspension. Wool fibers are soaked in the nano barium titanate suspension for 1-2 hours, taken out and microwave-treated. After microwave treatment, they are washed and dried to obtain modified wool fibers.

[0007] S2: Prepare a zinc oxide solution by mixing zinc oxide and a crosslinking agent. Soak polylactic acid fiber in the zinc oxide solution for 30-60 minutes to obtain modified polylactic acid fiber. Use the modified wool fiber from S1 as the wrapping yarn and the modified polylactic acid fiber as the core yarn for wrapping spinning to obtain modified wool polylactic acid yarn.

[0008] S3: Lyocell fiber and nano-silver fiber are spun side by side to obtain modified Lyocell yarn; Modal fiber is soaked in quaternary ammonium salt solution for 30-45 minutes, taken out and dried to obtain modified Modal fiber;

[0009] S4: The modified wool polylactic acid yarn in S2, the modified lyocell yarn in S3, and the modified modal fiber are respectively carded and laid into a web, and then shaped to obtain a wool antibacterial quilt core material.

[0010] In a preferred embodiment of the present invention, the mass ratio of the barium titanate powder, the coupling agent, and the nano-silica is 20-30:0.5-2:10-20, the particle sizes of the barium titanate powder and the nano-silica are 50-100 nm and 100-200 nm, respectively, and the molar concentration of the barium titanate powder in the nano-barium titanate suspension is 0.04-0.12 mol / L.

[0011] In a preferred embodiment of the present invention, the microwave processing parameters in S1 are 40-70°C, microwave power is 1000-1200W, and processing time is 4-30min.

[0012] In a preferred embodiment of the present invention, the wool fiber in S1 includes fine hairs and coarse hairs, the diameter of the fine hairs is 18-24 μm, the diameter of the coarse hairs is 45-55 μm, the length of the wool fiber is 40-120 mm, the particle size of the mixed particles is 300-500 nm, and the mass ratio of the fine hairs to the coarse hairs in the wool fiber is 2:8-4:6.

[0013] In a preferred embodiment of the present invention, the zinc oxide particle size in the zinc oxide solution in step S2 is 20-50 nm, and the mass concentrations of the zinc oxide and the crosslinking agent are 5-10% and 0.5-1%, respectively.

[0014] In a preferred embodiment of the present invention, the polylactic acid fiber in step S2 has a fineness of 5-10D, and the mass ratio between the polylactic acid fiber and the modified wool fiber is 1:2-4.

[0015] In a preferred embodiment of the present invention, the fineness of the lyocell fiber and the nanosilver fiber in step S3 is 4-8D and 1-3D, respectively, the fineness of the modal fiber is 6-12D, and the mass concentration of the quaternary ammonium salt solution is 2-4%.

[0016] In a preferred embodiment of the present invention, the mass ratio of the modified wool polylactic acid yarn, the modified lyocell yarn and the modified modal fiber in step S4 is 50-85:5-40:5-40.

[0017] In a preferred embodiment of the present invention, the S4 web laying method involves mixing the modified wool polylactic acid yarn, the modified lyocell yarn, and the modified modal fiber, and then mixing, carding, and laying the web using a carding machine. The carding speed is 10-30 m / min, the setting temperature is 100-120℃, and the setting time is 10-15 min.

[0018] To achieve the above objectives, the second technical solution adopted by the present invention is: a wool antibacterial quilt core material, which is prepared based on a method for preparing a wool antibacterial quilt core material.

[0019] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0020] (1) This invention provides a method for preparing wool antibacterial quilt core material. By using microwave treatment to remove the tips of wool scales and wrapping them with polylactic acid fibers, a three-layer composite antibacterial design of zinc oxide, nano silver and quaternary ammonium salt is adopted. Through photocatalysis, silver ion release and positive charge adsorption, a broad-spectrum and efficient antibacterial effect is achieved. Compared with the existing wool quilt core material preparation methods, this method solves the problem of easy failure of single antibacterial agents. It maintains antibacterial performance even after long-term use, retains the comfortable touch and breathability of natural fibers, avoids the stiffness and stuffiness of synthetic fibers, and simultaneously improves the antibacterial and moisture-wicking advantages. It comprehensively solves the core problems of insufficient softness and antibacterial properties of wool quilt cores.

[0021] (2) In this invention, the natural crimp of wool fibers and the straightness of polylactic acid fibers are combined to make the composite yarn more soft to the touch while maintaining its stiffness. The quilt filling material is more comfortable when used against the skin. The frictional resistance between fibers is reduced and the overall softness is significantly improved after the web is laid and shaped. Compared with the prior art, the balance between the warmth of wool and the softness of polylactic acid is achieved through precise control of fineness and ratio. This avoids the stiffness of pure wool and solves the problem of pure polylactic acid fibers being prone to pilling.

[0022] (3) In this invention, the coarse fibers enhance the interfacial friction with the polylactic acid core yarn through mechanical interlocking, reducing the risk of slippage. Meanwhile, the fine fibers form chemical bonds with the ester groups of polylactic acid through high-density active groups. The rigid support of the coarse fibers and the soft covering of the fine fibers form a synergistic structure. The coarse fibers act as a skeleton to prevent the core yarn from breaking, and the fine fibers act as a covering layer to fill the gaps. Compared with the prior art, the improved wettability promotes the wetting of the fiber by the molten polylactic acid, forming a tighter transition layer, reducing stress concentration, and jointly enhancing the mechanical-chemical synergistic bonding force of the wrapping interface.

[0023] (4) In this invention, after the medullary hairs quickly absorb moisture, the local humidity increases, which activates the release of zinc oxide ions and photocatalytic reaction. The humid environment makes it easier for bacterial cell membranes to be penetrated by active oxygen. The tight structure of the medullary hairs reduces the direct contact of external bacteria with the core yarn. At the same time, the antibacterial components of zinc oxide diffuse to the fabric surface through the moisture transfer of the medullary hairs. Compared with the prior art, it can enhance the antibacterial effect, has a three-dimensional antibacterial effect, and improves the antibacterial rate. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating the method steps of a preferred embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0028] like Figure 1 As shown,

[0029] A method for preparing a wool antibacterial comforter core material includes the following steps:

[0030] S1: Barium titanate powder, coupling agent and nano silica are ball-milled and mixed to obtain mixed particles. The mixed particles are placed in water and stirred to obtain a nano barium titanate suspension. Wool fibers are soaked in the nano barium titanate suspension for 1-2 hours, taken out and microwave-treated. After microwave treatment, they are washed and dried to obtain modified wool fibers.

[0031] S2: Prepare a zinc oxide solution by mixing zinc oxide and a crosslinking agent. Soak polylactic acid (PLA) fiber in the zinc oxide solution for 30-60 minutes to obtain modified PLA fiber. Use the modified wool fiber from S1 as the wrapping yarn and the modified PLA fiber as the core yarn for wrapping and spinning to obtain modified wool PLA yarn.

[0032] S3: Lyocell fiber and nano-silver fiber are spun side by side to obtain modified Lyocell yarn; Modal fiber is soaked in quaternary ammonium salt solution for 30-45 minutes, taken out and dried to obtain modified Modal fiber;

[0033] S4: The modified wool polylactic acid yarn in S2, the modified lyocell yarn in S3, and the modified modal fiber are respectively carded and laid into a web, and then shaped to obtain a wool antibacterial quilt core material.

[0034] The specific steps are as follows:

[0035] In S1;

[0036] The mass ratio of barium titanate powder, coupling agent and nano silica is 20-30:0.5-2:10-20. The particle sizes of barium titanate powder and nano silica are 50-100 nm and 100-200 nm, respectively. The molar concentration of barium titanate powder in the nano barium titanate suspension is 0.04-0.12 mol / L.

[0037] The ball milling and mixing were carried out in a planetary ball mill with zirconium oxide as the ball milling medium, with a ball-to-material ratio of 10:1, a ball milling speed of 300 r / min, and a ball milling time of 2 h, to ensure that the nanoparticles were fully dispersed and mixed.

[0038] The microwave processing parameters are 40-70℃, microwave power is 1000-1200W, and processing time is 4-30min.

[0039] Wool fibers consist of fine and coarse fibers. The diameter of the fine fibers is 18-24 μm, and the diameter of the coarse fibers is 45-55 μm. The length of the wool fibers is 40-120 mm, and the particle size of the mixed particles is 300-500 nm. The mass ratio of fine to coarse fibers in the wool fibers is 2:8-4:6. This wool fiber is Tan sheep wool, collected from the Lingwu City Fine Tan Sheep Cooperative, and is from the second wool growing season.

[0040] After microwave treatment, the modified wool fibers are subjected to ultrasonic treatment at 600-800W for 1-2 hours to remove residual mixed particles.

[0041] The characteristics of wool fibers immersed in a nano-barium titanate suspension and subjected to microwave treatment were analyzed. Through the combination of nanoparticles and fiber surface and the effect of microwave energy, the optimization of wool fiber structure by the modification process was analyzed. The scale tips of wool fibers were blunted, reducing friction and improving softness. The rigidity was improved from the inside of the fiber through physical modification, which not only avoided the problem of chemical reagent residue, but also improved the softness of wool while maintaining its natural warmth, further enhancing the comfort against the skin.

[0042] By using a reasonable ratio of fine to coarse fibers, the rigidity of wool fibers is fundamentally improved, making the material more comfortable to use against the skin. This avoids the problem of tangling caused by too much fine fiber and solves the itching caused by too much coarse fiber, further enhancing the user experience.

[0043] After microwave treatment, the medullary cavity structure of the medullary hairs is further opened, forming porous channels that quickly absorb human sweat or environmental moisture. After the scales on the surface of the non-medullated hairs are passivated, the coefficient of friction is reduced, but the hydrophobicity is maintained. As an outer wrapping thread, its hydrophobic surface quickly guides the moisture absorbed by the medullary hairs to the outside of the fabric for evaporation, exhibiting a gradient effect. The microporous structure of polylactic acid fibers further transfers moisture, while the catalytic effect of zinc oxide accelerates the decomposition of moisture, reducing the dampness inside the fabric and improving the overall moisture removal efficiency, thus preventing the continuous retention of moisture.

[0044] Zinc oxide nanoparticles form a conductive network within a polylactic acid (PLA) matrix, imparting conductivity to the fibers, rapidly dissipating static electricity, and reducing scale lifting in wool fibers caused by static electricity. Microwave treatment increases the microporous structure on the surface of the medullated wool, increasing the contact area with the modified PLA fibers and forming denser conductive pathways. The keratin in wool contains amino and carboxyl groups, which form charge-transfer complexes with the oxygen vacancies in zinc oxide. After encapsulation and spinning, the surface resistance of the yarn decreases, the static dissipation time is shortened, and conductivity is further enhanced.

[0045] After the medullary fibers rapidly absorb moisture, the local humidity increases, activating the release of zinc oxide ions and photocatalytic reactions. The humid environment makes it easier for bacterial cell membranes to be penetrated by reactive oxygen species, enhancing the antibacterial effect. The dense structure of the non-medullated fibers reduces direct contact between external bacteria and the core yarn. Simultaneously, the antibacterial components of the modified polylactic acid fiber diffuse to the fabric surface through moisture transfer from the medullary fibers, resulting in a three-dimensional antibacterial effect and an increased antibacterial rate.

[0046] In S2:

[0047] The zinc oxide particles in the zinc oxide solution have a diameter of 20-50 nm, and the mass concentrations of zinc oxide and crosslinking agent are 5-10% and 0.5-1%, respectively.

[0048] The fineness of polylactic acid fiber is 5-10D, and the mass ratio between polylactic acid fiber and modified wool fiber is 1:2-4.

[0049] The wrapping structure maximizes the utilization of different fiber properties, making the yarn softer to the touch while maintaining its antibacterial function, and providing a more uniform and stable material basis for subsequent web laying and shaping.

[0050] Through the deep fixation and continuous action of nano zinc oxide, it can maintain highly effective antibacterial properties even after multiple washes, further reducing the risk of odor or skin allergies caused by bacterial growth.

[0051] By leveraging the characteristics of nano-zinc oxide-modified polylactic acid (PLA) fibers, and optimizing the conductivity of zinc oxide and the fiber surface structure, the mechanism for enhancing antistatic properties was analyzed. Zinc oxide particles of 20-50 nm form uniformly distributed conductive points on the fiber surface, reducing the surface resistivity and enabling rapid dissipation of static charges generated by friction. The crosslinking agent enhances the bond between zinc oxide and the fiber, preventing discontinuities in the conductive layer caused by particle detachment.

[0052] The accumulation of static electricity in the comforter material is significantly reduced during use or friction, which reduces dust adsorption and electric shock sensation, resulting in a cleaner surface. Through the modification of the fibers themselves, an inherent antistatic ability is achieved, allowing the wool comforter to maintain a low static state even in dry environments, further improving the hygiene and comfort of use.

[0053] The static electricity buildup in the comforter material is significantly reduced during use or friction, which reduces dust adsorption and electric shock sensation, resulting in a cleaner surface. Through the modification and proportion control of the fibers themselves, an inherent antistatic ability is achieved, allowing the wool comforter to maintain a low static electricity state even in a dry environment, further improving the hygiene and comfort of use.

[0054] In S3:

[0055] The fineness of lyocell fiber and nanosilver fiber is 4-8D and 1-3D respectively, the fineness of modal fiber is 6-12D, and the mass concentration of quaternary ammonium salt solution is 2-4%.

[0056] By combining lyocell fiber and nano-silver fiber in parallel spinning, and modal fiber treated with quaternary ammonium salt, the diversity of antibacterial mechanisms was analyzed through the combination of multi-component antibacterial fibers. The contact sterilization of nano-silver and the cationic adsorption sterilization of quaternary ammonium salt complement each other. The strength of lyocell fiber and the softness of modal fiber are combined to improve the antibacterial stability of the material while maintaining the natural properties of the fiber.

[0057] By synergistically combining two antibacterial components with different mechanisms of action, the risk of bacterial resistance is reduced. At the same time, the combination of parallel spinning and chemical modification makes the antibacterial function more evenly distributed in each layer of the material, further improving the durability and comprehensiveness of the antibacterial effect.

[0058] The quilt filling material significantly improves the inhibition rate of common bacteria such as Staphylococcus aureus and Escherichia coli, and the antibacterial effect is not affected by the number of washes. Through fineness control and optimization of spinning structure, the deep fixation and continuous effect of nano-silver are achieved. Even after multiple uses or washes, it can still maintain high-efficiency antibacterial performance, further reducing the risk of odor or skin allergies caused by bacterial growth.

[0059] The static electricity buildup in the comforter material is significantly reduced during use or friction, which reduces dust adsorption and electric shock sensation, resulting in a cleaner surface. The inherent antistatic ability is achieved through the moisture absorption and conductivity properties of the fibers themselves, allowing the wool comforter to maintain a low static electricity state even in dry environments, further improving hygiene and comfort.

[0060] The filling material significantly improves the inhibition rate of common bacteria such as Staphylococcus aureus and Escherichia coli, and the antibacterial effect is not affected by the number of washes. Through the deep fixation and continuous action of quaternary ammonium salt, it can maintain highly efficient antibacterial performance even after multiple uses or washes, further reducing the risk of odor or skin allergies caused by bacterial growth.

[0061] The accumulation of static electricity in the comforter material is significantly reduced during use or friction, which reduces dust adsorption and electric shock sensation, and the surface is cleaner. The inherent antistatic ability is achieved through the moisture absorption and conductivity properties of the fibers themselves, so that the wool comforter can maintain a low static state even in a dry environment.

[0062] In S4:

[0063] The mass ratio of modified wool polylactic acid yarn, modified lyocell yarn and modified modal fiber is 50-85:5-40:5-40.

[0064] The web-laying method involves mixing modified wool polylactic acid yarn, modified lyocell yarn, and modified modal fiber, and then mixing, carding, and laying the web using a carding machine. The carding speed is 10-30 m / min, the setting temperature is 100-120℃, and the setting time is 10-15 min.

[0065] By combining combing and shaping, the material retains the unique functions of each fiber while achieving a more consistent overall feel and more stable antibacterial properties. Even after multiple washes or uses, it can still maintain good softness and antibacterial effects, further enhancing the product's durability and practicality.

[0066] The comforter filling material achieves a balance in multiple dimensions such as warmth, softness, and antibacterial properties. It avoids the itching caused by an excessive wool content and solves the problem of insufficient support from a single soft fiber. Through precise design of the mass ratio, it achieves a dual improvement in structural stability and user comfort, making the material conform more closely to the curves of the human body when used against the skin, further enhancing the consistency of warmth and feel.

[0067] The zinc oxide in the modified wool polylactic acid yarn forms the first antibacterial barrier; the nano-silver in the modified lyocell yarn forms the second line of defense through contact sterilization; and the quaternary ammonium salt in the modified modal fiber forms the third line of protection by disrupting bacterial cell membranes through cation adsorption. The mass ratio design ensures that the distribution density of each antibacterial component in the material is moderate, avoiding both local irritation due to excessive amounts of any one component and antibacterial blind spots due to insufficient amounts.

[0068] The filling material exhibits comprehensive and stable inhibitory effects against a variety of pathogenic bacteria, such as Staphylococcus aureus and Escherichia coli. Moreover, its antibacterial performance is not affected by the number of washes or uses. Through the optimization of the mass ratio, a deep integration of multi-target antibacterial mechanisms is achieved. Even if the local antibacterial components are reduced due to wear, other components can still maintain antibacterial function.

[0069] Modified lyocell yarn and modified modal fiber, due to their natural hygroscopic properties, can quickly absorb moisture from the environment, reducing the accumulation of static charge on the fiber surface caused by friction. The zinc oxide particles in the modified wool polylactic acid yarn enhance the conductivity of the fiber surface, allowing static charge to dissipate rapidly through ion migration. The weight ratio is designed to balance the content of hygroscopic and conductive fibers, avoiding problems such as excessive moisture regain due to too much hygroscopic fiber or reduced warmth retention due to too much conductive fiber.

[0070] The accumulation of static electricity in the comforter material is significantly reduced during use or friction, which reduces dust adsorption and electric shock sensation, and the surface is cleaner. The inherent antistatic ability is achieved through the moisture absorption and conductivity properties of the fibers themselves, so that the wool comforter can maintain a low static state even in a dry environment.

[0071] A carding speed of 10-30 m / min ensures that the fibers are fully dispersed during the carding process, avoiding fiber clumping or missed carding due to excessive speed, while also avoiding the impact of excessively slow speed on production efficiency. The moderate speed allows fibers of different fineness and modified treatments to be evenly distributed in the web, reducing performance differences caused by uneven fiber distribution.

[0072] After being shaped, the comforter core material has a compact structure and a smooth surface, which not only maintains the unique properties of each functional fiber, but also improves the material's durability and resistance to deformation. Through parameter optimization, a balance between structural fixation and functional retention is achieved, so that the comforter core material can maintain good performance after long-term use or washing, further extending the product's service life.

[0073] A wool antibacterial quilt core material is prepared based on a method for preparing a wool antibacterial quilt core material.

[0074] Example 1: A method for preparing a wool antibacterial comforter core material, comprising the following steps:

[0075] S1: Barium titanate powder, coupling agent and nano silica are ball-milled to obtain mixed particles. The mixed particles are placed in water and stirred to obtain a nano barium titanate suspension. The mass ratio of barium titanate powder, coupling agent and nano silica is 25:1:15. The particle sizes of barium titanate powder and nano silica are 80nm and 150nm, respectively, and the particle size of the mixed particles is 400nm.

[0076] The ball milling and mixing were carried out in a planetary ball mill with zirconium oxide as the ball milling medium, with a ball-to-material ratio of 10:1, a ball milling speed of 300 r / min, and a ball milling time of 2 h, to ensure that the nanoparticles were fully dispersed and mixed.

[0077] Wool fibers consist of fine and coarse fibers. The diameter of the fine fibers is 20 μm, and the diameter of the coarse fibers is 50 μm. The length of the wool fibers is 80 mm, and the mass ratio of fine to coarse fibers in the wool fibers is 1:9. The wool fibers are immersed in a nano-barium titanate suspension with a molar concentration of 0.08 mol / L of barium titanate powder for 1 hour. After being removed, they are subjected to microwave treatment with the following parameters: 40℃, microwave power of 1200W, and treatment time of 15 min, to obtain modified wool fibers.

[0078] S2: Zinc oxide and crosslinking agent are used to prepare a zinc oxide solution. The zinc oxide particle size in the zinc oxide solution is 30 nm. The mass concentrations of zinc oxide and crosslinking agent are 10% and 0.5%, respectively. Polylactic acid fiber is soaked in the zinc oxide solution for 45 min to obtain modified polylactic acid fiber. The modified wool fiber in S1 is used as the wrapping yarn, and the modified polylactic acid fiber is used as the core yarn for wrapping spinning. The fineness of polylactic acid fiber is 5D, and the mass ratio between polylactic acid fiber and modified wool fiber is 1:2 to obtain modified wool polylactic acid yarn.

[0079] S3: Lyocell fiber and nano-silver fiber are spun side by side to obtain modified Lyocell yarn. The fineness of Lyocell fiber and nano-silver fiber are 6D and 2D, respectively. Modal fiber is soaked in quaternary ammonium salt solution for 30 minutes. The fineness of Modal fiber is 6D and the mass concentration of quaternary ammonium salt solution is 3%. The fiber is then removed and dried to obtain modified Modal fiber.

[0080] S4: The modified wool polylactic acid yarn in S2, the modified lyocell yarn in S3, and the modified modal fiber are respectively carded and laid into a web. The mass ratio between the modified wool polylactic acid yarn, the modified lyocell yarn, and the modified modal fiber is 70:15:15. The web laying method is to mix the modified wool polylactic acid yarn, the modified lyocell yarn, and the modified modal fiber, and then mix, card, and lay the web through a carding machine. The carding speed is 20m / min, the setting temperature is 100℃, and the setting time is 10min. After setting, a wool antibacterial quilt core material is obtained.

[0081] Example 2: The difference between this example and Example 1 is that the mass ratio of fine hair to coarse hair in the wool fiber is 2:8, while the rest are the same.

[0082] Example 3: The difference between this example and Example 1 is that the mass ratio of fine hair to coarse hair in the wool fiber is 3:7, while the rest are the same.

[0083] Example 4: The difference between this example and Example 1 is that the mass ratio of fine hair to coarse hair in the wool fiber is 4:6, while the rest are the same.

[0084] Example 5: The difference between this example and Example 1 is that the mass ratio of fine hair to coarse hair in the wool fiber is 5:5, while the rest are the same.

[0085] Example 6: The difference between this example and Example 3 is that the mass ratio between polylactic acid fiber and modified wool fiber is 1:1, while the rest are the same.

[0086] Example 7: The difference between this example and Example 3 is that the mass ratio between polylactic acid fiber and modified wool fiber is 1:3, and the rest are the same.

[0087] Example 8: The difference between this example and Example 3 is that the mass ratio between polylactic acid fiber and modified wool fiber is 1:4, while the rest are the same.

[0088] Example 9: The difference between this example and Example 3 is that the mass ratio between polylactic acid fiber and modified wool fiber is 1:5, and the rest are the same.

[0089] Example 10: This example describes the preparation of a modified wool fiber, with the following specific steps:

[0090] Barium titanate powder, coupling agent, and nano silica were ball-milled to obtain mixed particles. The mixed particles were then placed in water and stirred to obtain a nano barium titanate suspension. The mass ratio of barium titanate powder, coupling agent, and nano silica was 25:1:15. The particle sizes of barium titanate powder and nano silica were 80 nm and 150 nm, respectively, and the particle size of the mixed particles was 400 nm.

[0091] The ball milling and mixing were carried out in a planetary ball mill with zirconium oxide as the ball milling medium, with a ball-to-material ratio of 10:1, a ball milling speed of 300 r / min, and a ball milling time of 2 h, to ensure that the nanoparticles were fully dispersed and mixed.

[0092] Wool fibers consist of fine and coarse fibers. The diameter of the fine fibers is 20 μm, and the diameter of the coarse fibers is 50 μm. The length of the wool fibers is 80 mm, and the mass ratio of fine to coarse fibers in the wool fibers is 3:7. The wool fibers are immersed in a nano-barium titanate suspension with a molar concentration of 0.08 mol / L for 1 h. After being removed, they are subjected to microwave treatment with the following parameters: 40 °C, microwave power of 1200 W, and treatment time of 15 min, to obtain modified wool fibers.

[0093] Comparative Example 1: This comparative example provides a wool comforter core material, the preparation process of which is shown below:

[0094] Wool, polylactic acid fiber, modal fiber and lyocell fiber were carded and laid out separately at a carding speed of 20m / min, a setting temperature of 100℃ and a setting time of 10min, and then set.

[0095] Comparative Example 2: This comparative example provides a modified wool fiber, the specific steps of which are as follows:

[0096] Wool fibers consist of fine and coarse fibers. The fine fibers have a diameter of 20 μm, and the coarse fibers have a diameter of 50 μm. The length of the wool fibers is 80 mm, and the mass ratio of fine to coarse fibers is 3:7. The wool fibers were immersed in a nano-barium titanate suspension with a molar concentration of 0.08 mol / L and a particle size of 80 nm. After immersion, the fibers were subjected to microwave treatment at 40 °C, with a microwave power of 1200 W and a treatment time of 15 min to obtain modified wool fibers.

[0097] Examples 1-9 and Comparative Example 1 were subjected to antistatic and antibacterial tests, respectively. The testing standard for antistatic testing was the national standard GB / T 12703.4-2021, and the testing standard for antibacterial testing was the national standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method". The test data are shown in Table 1.

[0098] Table 1. Antistatic and antibacterial test data for Examples 1-9 and Comparative Example 1.

[0099] Data source Conductivity (%) Antibacterial rate (%) Example 1 36.7 84.6 Example 2 39.5 85.1 Example 3 46.9 86.3 Example 4 43.7 85.4 Example 5 41.8 84.6 Example 6 42.9 85.2 Example 7 53.1 88.4 Example 8 48.0 87.9 Example 9 41.7 86.3 Comparative Example 1 13.2 53.2

[0100] As shown in Table 1, the conductivity and antibacterial rate of Examples 1-9 are all greater than those of Comparative Example 1, demonstrating the superiority of this application.

[0101] In Examples 1-5, as the proportion of fine hairs in the wool fibers gradually increases, both antistatic and antibacterial properties initially increase and then decrease. This is because fine hairs, due to their small diameter and large specific surface area, initially increase the contact area between fibers, allowing static charges generated by friction to be quickly conducted through a denser fiber network. Simultaneously, fine hairs are more likely to carry conductive components such as zinc oxide, forming a uniform conductive layer and reducing surface resistivity. However, when the proportion of fine hairs exceeds a certain threshold, the overall rigidity of the fiber bundle decreases, the structure becomes too loose, the distribution density of conductive components decreases, and the static charges generated by friction between fine hairs are difficult to dissipate effectively due to the loose fiber arrangement, leading to a decrease in antistatic properties. Fine hairs, with their large surface area, can initially carry more antibacterial components such as zinc oxide and quaternary ammonium salts, and the fine hairs have more sufficient contact with the skin, allowing the released zinc ions or quaternary ammonium salt cations to directly act on bacterial cell membranes. However, when the proportion of fine hairs is too high, the porosity of the fiber bundle decreases, hindering the penetration and diffusion of antibacterial components within the material, resulting in uneven distribution of antibacterial agents in certain areas. Simultaneously, the scale layer structure of coarse hairs, which originally aids in the adsorption of bacteria and enhances the effect of antibacterial components, weakens this auxiliary mechanism when the proportion of coarse hairs decreases, leading to a slowdown or even a decrease in the improvement of antibacterial activity. The preferred embodiment is Example 3.

[0102] In Examples 3 and 6-9, as the proportion of modified wool in the mass ratio of polylactic acid (PLA) fiber to modified wool fiber gradually increased, both antistatic and antibacterial properties initially increased and then decreased. This is because PLA fiber, due to its conductive components, can initially form a uniform conductive network, reducing the fiber surface resistivity; while modified wool fiber, due to its enhanced hygroscopicity, can reduce static charge accumulation by absorbing environmental moisture. When the proportion of modified wool increases, its hygroscopicity complements the conductivity of PLA fiber, resulting in a significant improvement in antistatic properties initially. However, when the proportion of modified wool exceeds a certain threshold, the overall hygroscopicity of the fiber bundle becomes too strong. In a dry environment, rapid evaporation of moisture causes the conductive network to break. At the same time, the scale layer structure of wool fiber increases inter-fiber friction, and the generated static charge is difficult to dissipate due to insufficient conductive components, leading to a decrease in antistatic properties. Zinc oxide loaded with polylactic acid fibers can continuously release zinc ions to inhibit bacterial growth. Modified wool fibers, after treatment, exhibit enhanced surface activity, which can assist in adsorbing and disrupting bacterial cell membranes, thus strengthening antibacterial properties. However, when the proportion of modified wool is too high, the fiber bundle porosity decreases, hindering the diffusion of antibacterial components such as zinc oxide within the material. This results in uneven distribution of antibacterial agents in certain areas. Furthermore, the moisture absorbed by the wool creates a humid microenvironment, which in turn provides conditions for bacterial growth, leading to a slowdown or even a decrease in the improvement of antibacterial properties. Example 7 is a preferred embodiment.

[0103] The modified wool fibers prepared in Example 10 and Comparative Example 2 were tested for the ratio of coarse to fine hair mass. The test standard for the ratio of coarse to fine hair mass of wool fibers is GB / T 21030-2023. The test data are shown in Table 2.

[0104] Table 2. Test data on the ratio of coarse to fine wool fiber mass in Example 10 and Comparative Example 2.

[0105] Data source The ratio of fine hair to coarse hair quality Example 10 3:7 Comparative Example 2 1:9

[0106] As shown in Table 2, the mass ratio of fine hairs in the modified wool fiber of Example 10 is greater than that in the modified wool fiber of Comparative Example 2. This is because barium titanate, as a core with a high dielectric constant, is responsible for strongly absorbing microwave energy, while nano-silica plays a role in improving particle dispersion and regulating interfacial heat conduction, so that microwave energy can be applied more concentratedly and evenly to the scale tip area of ​​all fibers. Since the cortical layer of fine hairs has a small volume and low heat capacity, it is more sensitive to overall overheating. Precise tip heating ensures that the energy is only enough to break the scales but not enough to cause thermal damage to the main structure of the fine hairs, thus preserving the integrity of the fine hairs while effectively treating them.

[0107] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing a wool antibacterial comforter core material, characterized in that, Includes the following steps: S1: Barium titanate powder, coupling agent and nano silica are ball-milled and mixed to obtain mixed particles. The mixed particles are placed in water and stirred to obtain a nano barium titanate suspension. Wool fibers are soaked in the nano barium titanate suspension for 1-2 hours, taken out and microwave-treated. After microwave treatment, they are washed and dried to obtain modified wool fibers. S2: Prepare a zinc oxide solution by mixing zinc oxide and a crosslinking agent. Soak polylactic acid fiber in the zinc oxide solution for 30-60 minutes to obtain modified polylactic acid fiber. Use the modified wool fiber from S1 as the wrapping yarn and the modified polylactic acid fiber as the core yarn for wrapping spinning to obtain modified wool polylactic acid yarn. S3: Lyocell fiber and nano-silver fiber are spun side by side to obtain modified Lyocell yarn; Modal fiber is soaked in quaternary ammonium salt solution for 30-45 minutes, taken out and dried to obtain modified Modal fiber; S4: The modified wool polylactic acid yarn in S2, the modified lyocell yarn in S3, and the modified modal fiber are respectively carded and laid into a web, and then shaped to obtain a wool antibacterial quilt core material.

2. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The mass ratio of the barium titanate powder, the coupling agent, and the nano-silica is 20-30:0.5-2:10-20. The particle sizes of the barium titanate powder and the nano-silica are 50-100 nm and 100-200 nm, respectively. The molar concentration of the barium titanate powder in the nano-barium titanate suspension is 0.04-0.12 mol / L.

3. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The microwave processing parameters in S1 are 40-70℃, microwave power 1000-1200W, and processing time 4-30min.

4. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The wool fibers in S1 include fine and coarse fibers. The diameter of the fine fibers is 18-24 μm, the diameter of the coarse fibers is 45-55 μm, the length of the wool fibers is 40-120 mm, the particle size of the mixed particles is 300-500 nm, and the mass ratio of the fine fibers to the coarse fibers in the wool fibers is 2:8-4:

6.

5. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The zinc oxide particles in the zinc oxide solution in S2 have a particle size of 20-50 nm, and the mass concentrations of the zinc oxide and the crosslinking agent are 5-10% and 0.5-1%, respectively.

6. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The polylactic acid fiber in S2 has a fineness of 5-10D, and the mass ratio between the polylactic acid fiber and the modified wool fiber is 1:2-4.

7. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: In S3, the fineness of the lyocell fiber and the nanosilver fiber are 4-8D and 1-3D respectively, the fineness of the modal fiber is 6-12D, and the mass concentration of the quaternary ammonium salt solution is 2-4%.

8. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The mass ratio of the modified wool polylactic acid yarn, the modified lyocell yarn, and the modified modal fiber in S4 is 50-85:5-40:5-40.

9. The method for preparing a wool antibacterial quilt core material according to claim 1, characterized in that: The S4 web-laying method involves mixing the modified wool polylactic acid yarn, the modified lyocell yarn, and the modified modal fiber, and then mixing, carding, and laying the web using a carding machine. The carding speed is 10-30 m / min, the setting temperature is 100-120℃, and the setting time is 10-15 min.

10. A wool antibacterial comforter filling material, characterized in that, It is prepared based on the preparation method of the wool antibacterial quilt core material according to any one of claims 1-9.

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