Antibacterial warm-keeping pineapple fiber blended fabric and preparation method thereof

Abstract

This application relates to the field of textile technology, and in particular to an antibacterial and warm pineapple fiber blended fabric and its preparation method. The fabric uses pineapple fiber, viscose fiber, polyester fiber, acrylic fiber, and spandex filament as raw materials, blended in a specific weight ratio, and then processed through opening and carding and three-stage drawing processes to form uniform blended fiber slivers. Antibacterial agents, warming agents, and crosslinking agents are then uniformly penetrated into the fibers through a uniform penetration finishing process, followed by heat setting treatment. The fabric's antibacterial properties meet the requirements of GB / T20944.3-2007 standard, its warming properties meet the requirements of GB / T11048-2008 standard, and its hand softness reaches level 4 or higher. The fabric prepared by this invention possesses excellent antibacterial properties, long-lasting warmth retention, and good wearing performance.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to an antibacterial and warm pineapple fiber blended fabric and its preparation method. Background Technology

[0002] As a crucial interface material between the human body and the environment, the functionalization and high performance of textile fabrics have always been important development directions for the textile industry. Pineapple fiber is a natural cellulose fiber extracted from pineapple leaves, possessing excellent breathability, moisture absorption, and biodegradability. Its naturally porous surface structure also gives it potential advantages in warmth retention. However, when used alone, pineapple fiber suffers from low mechanical properties, high fiber stiffness, and a rough fabric feel, making it difficult to meet the requirements of softness and comfort in apparel fabrics. Current technologies often employ blending pineapple fiber with conventional textile fibers to improve the overall performance of the fabric.

[0003] However, conventional blended fabrics have significant shortcomings in terms of functionality. Natural fibers are inherently prone to bacterial growth, and microorganisms multiply rapidly in humid environments, leading to unpleasant odors and impacting human health. Existing antibacterial treatments mostly rely on finishing agent coatings or metal ion loading such as silver ions. These methods suffer from poor antibacterial durability, a significant decrease in antibacterial effectiveness after multiple washes, and some antibacterial agents pose safety risks. Furthermore, conventional thermal fabrics primarily achieve their insulation effect by increasing fiber density or thickness, resulting in reduced breathability, stuffiness, and discomfort when worn, making it difficult to simultaneously achieve both warmth and breathability.

[0004] In the preparation of pineapple fiber blended fabrics, existing spinning and weaving processes are not well adapted to the characteristics of pineapple fiber. Pineapple fiber has a large length dispersion and low fiber strength, making it prone to breakage and fly waste during traditional spinning processes, affecting yarn quality and production efficiency. Furthermore, the significant differences in physical properties between pineapple fiber and synthetic fibers can easily lead to uneven yarn texture and significant strength fluctuations during blending, impacting subsequent weaving and finished product quality. Conventional fabric finishing processes cannot fully unleash the potential of the natural porous structure of pineapple fiber, resulting in limited improvement in warmth retention and negatively impacting other fabric properties. Therefore, developing a pineapple fiber blended fabric with excellent antibacterial and warmth retention properties, as well as comfortable wear, and its preparation method, has significant practical application value. Summary of the Invention

[0005] The purpose of this invention is to provide an antibacterial and warm pineapple fiber blended fabric and its preparation method, so as to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing an antibacterial and warm pineapple fiber blended fabric, comprising the following steps: (1) Weigh out the following high-purity raw materials by weight: 25-35 parts of pineapple fiber, 30-40 parts of combed cotton fiber, 20-30 parts of Modal fiber, 5-10 parts of Derong heat-generating fiber and 3-5 parts of silver ion antibacterial viscose fiber. Then, pass the weighed fiber raw materials through an automatic cotton grabber and a cotton blender to open and mix them in sequence to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to a carding machine for fine carding to remove impurities and short fibers, and a carded fiber web is obtained. The fiber web is then laid in multiple layers by a web laying machine, with 6 to 8 layers to form a uniform fiber layer. The fiber layer is then fed into a pre-wetting device for pre-wetting treatment. The pre-wetting liquid is a polyacrylate color-fixing agent solution with a mass concentration of 0.5 to 1.5%. The pre-wetting temperature is controlled at 25 to 35°C. The fiber layer is then pressed by rollers, with the roll residue controlled at 65 to 75%, to obtain a pre-wetted fiber layer. (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 8~12MPa, the hydroentanglement density is 15~20 slits / cm², and the hydroentanglement angle is 75°~85°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 160~180℃, the setting time is 25~35s, and the setting tension is 8~12N / m, to obtain the heat-set base fabric. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 2-4 parts by weight of chitosan derivative antibacterial agent, 3-5 parts by weight of phase change energy storage microcapsules, 1-2 parts by weight of softener and 0.5-1 parts by weight of crosslinking agent. The pH value of the padding liquid is 5.5-6.5, the padding pressure is 0.15-0.25 MPa, and the padding residue is 70-80%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 80-100℃ for 15-25s. Then, it is baked in a baking zone at a temperature of 140-160℃ for 45-65s to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 120~140℃, the blanket pressure is 0.3~0.5MPa, and the machine speed is 8~12m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric.

[0007] Furthermore, the pineapple fiber mentioned in step (1) is: pineapple fiber after degumming treatment, with a fiber length of 35~55mm and a fineness of 1.8~2.5dtex.

[0008] Furthermore, the combed cotton fiber mentioned in step (1) is a combed cotton fiber with a length of 32~36mm and a fineness of 1.2~1.4dtex.

[0009] Furthermore, the Modal fiber mentioned in step (1) is a Modal fiber with a length of 38~42mm and a fineness of 1.3~1.6dtex.

[0010] Furthermore, the Derong heating fiber mentioned in step (1) is: Derong heating fiber with an irregular cross-section, the fiber cross-section is cross-shaped, the fiber length is 38~45mm, and the fineness is 1.0~1.3dtex.

[0011] Furthermore, the silver ion antibacterial viscose fiber mentioned in step (1) is: silver ion antibacterial viscose fiber with a silver ion content of 0.3~0.5%, a fiber length of 38~42mm, and a fineness of 1.4~1.7dtex.

[0012] Furthermore, the polyacrylate fixing agent mentioned in step (2) is an anionic polyacrylate fixing agent with a solid content of 30-35%.

[0013] Furthermore, the hydroentangling pressure in step (3) is 10 MPa, the hydroentangling density is 18 punctures / cm², and the hydroentangling angle is 80°.

[0014] Furthermore, the heat setting temperature in step (3) is 170℃, the setting time is 30s, and the setting tension is 10N / m.

[0015] Furthermore, the chitosan derivative antibacterial agent in step (4) is hydroxypropyl chitosan with a molecular weight of 80,000 to 120,000.

[0016] Furthermore, the phase change energy storage microcapsules mentioned in step (4) are: paraffin-based phase change microcapsules with a phase change temperature of 25~28℃ and a particle size of 5~15μm.

[0017] Furthermore, the crosslinking agent in step (4) is: hexamethylol melamine resin.

[0018] Furthermore, an antibacterial and warm pineapple fiber blended fabric is applied to the field of apparel fabrics. The fabric has been tested by authoritative institutions and found to have an antibacterial rate of over 99.2%, a warmth retention rate of 45-52%, an air permeability of 850-950 mm / s, and a softness of 3.5-4.2 cN, meeting all the performance requirements of apparel fabrics.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention uses pineapple fiber as the main raw material, and blends it with combed cotton fiber, Modal fiber, Derong heat-generating fiber and silver ion antibacterial viscose fiber, and combines hydroentanglement reinforcement process and functional finishing process to produce pineapple fiber blended fabric with both antibacterial and warm properties.

[0020] This invention utilizes a blend of pineapple fiber, combed cotton fiber, and Modal fiber to effectively improve the rough hand feel and low mechanical properties of pure pineapple fiber fabrics. The irregular cross-sectional structure of the Derong heat-generating fiber creates a static air layer, reducing heat loss and significantly improving the fabric's warmth retention. The introduction of silver ion antibacterial viscose fiber endows the fabric with long-lasting antibacterial properties. Silver ions bind to proteins on bacterial cell membranes, disrupting cell membrane integrity and achieving highly efficient broad-spectrum antibacterial effects. Chitosan derivative antibacterial agents further enhance the fabric's antibacterial effect; the amino ions on their molecular chains electrostatically adsorb the negative charges on bacterial surfaces, synergistically improving antibacterial durability. The addition of phase change energy storage microcapsules gives the fabric temperature regulation capabilities, maintaining surface comfort through phase change heat absorption and release when ambient temperature changes. The spunlace reinforcement process creates a three-dimensional entangled structure in the fibers, giving the fabric good structural stability and breathability. After multiple washes, the functionally finished fabric maintains an antibacterial rate of over 98.5%, with a warmth retention rate decrease of no more than 5%, achieving long-lasting stability of antibacterial and warmth retention properties. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process flow for preparing the antibacterial and warm pineapple fiber blended fabric of the present invention. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The test methods for various indicators of the antibacterial and warm pineapple fiber blended fabric prepared in the following embodiments are as follows: Antibacterial rate test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-5 were tested according to the Chinese National Standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method". A circular sample of 5cm×5cm was placed in a shaking incubator and shaken at 37℃ for 24h. The antibacterial rate was calculated.

[0024] Warmth retention test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-5 were tested according to the Chinese national standard GB / T11048-2018 "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions for physiological comfort". A YG606 thermal insulation instrument was used. The test temperature was 20℃, the relative humidity was 65%, and the wind speed was 0.1m / s. The warmth retention rate was calculated.

[0025] Air permeability test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-5 were tested according to the Chinese national standard GB / T5453-1997 "Determination of air permeability of textile fabrics". The air permeability was measured using a GX-1000 air permeability meter under a pressure difference of 100Pa.

[0026] Softness test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-5 were tested according to the Chinese National Standard GB / T18318-2009 "Determination of Bending Properties of Textiles". The softness value of the fabrics was measured using a YG22 fully automatic softness tester. Example 1:

[0027] (1) Weigh out the following high-purity raw materials by weight: 25 parts by weight of pineapple fiber, 40 parts by weight of combed cotton fiber, 20 parts by weight of Modal fiber, 10 parts by weight of Derong heat-generating fiber and 5 parts by weight of silver ion antibacterial viscose fiber. The pineapple fiber is pineapple fiber after degumming treatment, with a fiber length of 35 mm and a fineness of 2.5 dtex; the combed cotton fiber has a length of 32 mm and a fineness of 1.4 dtex; the Modal fiber has a length of 38 mm and a fineness of 1.6 dtex; the Derong heat-generating fiber is a cross-shaped cross-section fiber with an irregular cross-section structure, a length of 38 mm and a fineness of 1.3 dtex; the silver ion antibacterial viscose fiber has a silver ion content of 0.3%, a fiber length of 38 mm and a fineness of 1.7 dtex; the weighed fiber raw materials are then opened and mixed by an automatic cotton grabber and a cotton blender to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to the carding machine for fine carding to remove impurities and short fibers, and the carded fiber web is obtained; the fiber web is laid in multiple layers by the web laying machine, with 6 layers to form a uniform fiber layer; the fiber layer is sent to the pre-wetting device for pre-wetting treatment, the pre-wetting liquid is a polyacrylate fixing agent solution with a mass concentration of 0.5% (anionic polyacrylate fixing agent with a solid content of 30%), the pre-wetting temperature is controlled at 25℃, and then it is pressed by the rollers, with the roll residue controlled at 75%, to obtain the pre-wetted fiber layer; (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 8MPa, the hydroentanglement density is 15 slits / cm², and the hydroentanglement angle is 75°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 160℃, the setting time is 25s, and the setting tension is 8N / m, to obtain the heat-set base fabric. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 2 parts by weight of hydroxypropyl chitosan antibacterial agent (molecular weight of 80,000), 3 parts by weight of paraffin phase change microcapsules (particle size of 5 μm) with a phase change temperature of 25℃, 1 part by weight of softener and 0.5 parts by weight of hexamethylol melamine resin crosslinking agent. The pH value of the padding liquid is 5.5, the padding pressure is 0.15 MPa, and the padding residue is 80%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 80℃ for 15s, and then baked in a baking zone at a temperature of 140℃ for 45s to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 120℃, the blanket pressure is 0.3MPa, and the machine speed is 8m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric. Example 2:

[0028] (1) Weigh out the following high-purity raw materials by weight: 28 parts by weight of pineapple fiber, 38 parts by weight of combed cotton fiber, 22 parts by weight of Modal fiber, 8 parts by weight of Derong heat-generating fiber and 4 parts by weight of silver ion antibacterial viscose fiber. The pineapple fiber is pineapple fiber after degumming treatment, with a fiber length of 40 mm and a fineness of 2.2 dtex; the combed cotton fiber has a length of 33 mm and a fineness of 1.3 dtex; the Modal fiber has a length of 39 mm and a fineness of 1.5 dtex; the Derong heat-generating fiber is a cross-shaped cross-section fiber with an irregular cross-section structure, a length of 40 mm and a fineness of 1.2 dtex; the silver ion antibacterial viscose fiber has a silver ion content of 0.35%, a fiber length of 39 mm and a fineness of 1.6 dtex; the weighed fiber raw materials are then opened and mixed by an automatic cotton grabber and a cotton blender to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to the carding machine for fine carding to remove impurities and short fibers, and the carded fiber web is obtained; the fiber web is laid in multiple layers by the web laying machine, with a web laying layer of 7 layers to form a uniform fiber layer; the fiber layer is sent to the pre-wetting device for pre-wetting treatment, the pre-wetting liquid is a polyacrylate fixing agent solution with a mass concentration of 0.8% (anionic polyacrylate fixing agent with a solid content of 32%), the pre-wetting temperature is controlled at 28℃, and then it is pressed by the rollers, with the roll residue controlled at 72%, to obtain the pre-wetted fiber layer; (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 9MPa, the hydroentanglement density is 16 slits / cm², and the hydroentanglement angle is 78°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 165℃, the setting time is 28s, and the setting tension is 9N / m, to obtain the heat-set base fabric. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 2.5 parts by weight of hydroxypropyl chitosan antibacterial agent (molecular weight of 90,000), 3.5 parts by weight of paraffin phase change microcapsules (particle size of 8 μm) with a phase change temperature of 26℃, 1.2 parts by weight of softener and 0.6 parts by weight of hexamethylol melamine resin crosslinking agent. The pH value of the padding liquid is 5.8, the padding pressure is 0.18 MPa, and the padding residue is 76%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 85℃ for 18s, and then baked in a baking zone at a temperature of 145℃ for 50s to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 125℃, the blanket pressure is 0.35MPa, and the machine speed is 9m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric. Example 3:

[0029] (1) Weigh out the following high-purity raw materials by weight: 30 parts by weight of pineapple fiber, 35 parts by weight of combed cotton fiber, 25 parts by weight of Modal fiber, 6 parts by weight of Derong heat-generating fiber and 4 parts by weight of silver ion antibacterial viscose fiber. The pineapple fiber is pineapple fiber after degumming treatment, with a fiber length of 45 mm and a fineness of 2.0 dtex; the combed cotton fiber has a length of 34 mm and a fineness of 1.3 dtex; the Modal fiber has a length of 40 mm and a fineness of 1.4 dtex; the Derong heat-generating fiber is a cross-shaped cross-section fiber with an irregular cross-section structure, a length of 42 mm and a fineness of 1.1 dtex; the silver ion antibacterial viscose fiber has a silver ion content of 0.4%, a fiber length of 40 mm and a fineness of 1.5 dtex; the weighed fiber raw materials are then opened and mixed by an automatic cotton grabber and a cotton blender to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to the carding machine for fine carding to remove impurities and short fibers, and the carded fiber web is obtained. The fiber web is laid in multiple layers by the web laying machine, with a web laying layer of 7 layers to form a uniform fiber layer. The fiber layer is sent to the pre-wetting device for pre-wetting treatment. The pre-wetting liquid is a polyacrylate fixing agent solution with a mass concentration of 1.0% (anionic polyacrylate fixing agent with a solid content of 33%). The pre-wetting temperature is controlled at 30℃. Then, it is pressed by the rollers, and the roll residue is controlled at 70% to obtain the pre-wetted fiber layer. (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 10MPa, the hydroentanglement density is 18 slits / cm², and the hydroentanglement angle is 80°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 170℃, the setting time is 30s, and the setting tension is 10N / m to obtain the heat-set base. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 3 parts by weight of hydroxypropyl chitosan antibacterial agent (molecular weight of 100,000), 4 parts by weight of paraffin phase change microcapsules (particle size of 10 μm) with a phase change temperature of 27°C, 1.5 parts by weight of softener and 0.7 parts by weight of hexamethylol melamine resin crosslinking agent. The pH value of the padding liquid is 6.0, the padding pressure is 0.20 MPa, and the padding residue is 75%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 90°C for 20 seconds, and then baked in a baking zone at a temperature of 150°C for 55 seconds to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 130℃, the blanket pressure is 0.40MPa, and the machine speed is 10m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric. Example 4:

[0030] (1) Weigh out the following high-purity raw materials by weight: 32 parts by weight of pineapple fiber, 33 parts by weight of combed cotton fiber, 28 parts by weight of Modal fiber, 6 parts by weight of Derong heat-generating fiber and 4 parts by weight of silver ion antibacterial viscose fiber. The pineapple fiber is pineapple fiber after degumming treatment, with a fiber length of 50 mm and a fineness of 1.9 dtex; the combed cotton fiber has a length of 35 mm and a fineness of 1.2 dtex; the Modal fiber has a length of 41 mm and a fineness of 1.4 dtex; the Derong heat-generating fiber is a cross-shaped cross-section fiber with an irregular cross-section structure, a length of 44 mm and a fineness of 1.1 dtex; the silver ion antibacterial viscose fiber has a silver ion content of 0.45%, a fiber length of 41 mm and a fineness of 1.5 dtex; the weighed fiber raw materials are then opened and mixed by an automatic cotton grabber and a cotton blender to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to the carding machine for fine carding to remove impurities and short fibers, and the carded fiber web is obtained. The fiber web is laid in multiple layers by the web laying machine, with a web laying layer of 8 layers to form a uniform fiber layer. The fiber layer is sent to the pre-wetting device for pre-wetting treatment. The pre-wetting liquid is a polyacrylate fixing agent solution with a mass concentration of 1.2% (anionic polyacrylate fixing agent with a solid content of 34%). The pre-wetting temperature is controlled at 32℃. Then, it is pressed by the rollers, and the roll residue is controlled at 68% to obtain the pre-wetted fiber layer. (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 11MPa, the hydroentanglement density is 19 slits / cm², and the hydroentanglement angle is 82°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 175℃, the setting time is 32s, and the setting tension is 11N / m, thus obtaining the heat-set base fabric. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 3.5 parts by weight of hydroxypropyl chitosan antibacterial agent (molecular weight of 110,000), 4.5 parts by weight of paraffin phase change microcapsules (particle size of 12 μm) with a phase change temperature of 27°C, 1.8 parts by weight of softener and 0.85 parts by weight of hexamethylol melamine resin crosslinking agent. The pH value of the padding liquid is 6.3, the padding pressure is 0.22 MPa, and the padding residue is 73%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 95°C for 22 seconds, and then baked in a baking zone at a temperature of 155°C for 60 seconds to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 135℃, the blanket pressure is 0.45MPa, and the machine speed is 11m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric. Example 5:

[0031] (1) Weigh out the following high-purity raw materials by weight: 35 parts by weight of pineapple fiber, 30 parts by weight of combed cotton fiber, 30 parts by weight of Modal fiber, 5 parts by weight of Derong heat-generating fiber and 3 parts by weight of silver ion antibacterial viscose fiber. The pineapple fiber is pineapple fiber after degumming treatment, with a fiber length of 55 mm and a fineness of 1.8 dtex; the combed cotton fiber has a length of 36 mm and a fineness of 1.2 dtex; the Modal fiber has a length of 42 mm and a fineness of 1.3 dtex; the Derong heat-generating fiber is a cross-shaped cross-section fiber with an irregular cross-section structure, a length of 45 mm and a fineness of 1.0 dtex; the silver ion antibacterial viscose fiber has a silver ion content of 0.5%, a fiber length of 42 mm and a fineness of 1.4 dtex; the weighed fiber raw materials are then opened and mixed by an automatic cotton grabber and a cotton blender to obtain mixed fiber raw materials. (2) The mixed fiber raw materials are fed to the carding machine for fine carding to remove impurities and short fibers, and the carded fiber web is obtained. The fiber web is laid in multiple layers by the web laying machine, with a web laying layer of 8 layers to form a uniform fiber layer. The fiber layer is sent to the pre-wetting device for pre-wetting treatment. The pre-wetting liquid is a polyacrylate fixing agent solution with a mass concentration of 1.5% (anionic polyacrylate fixing agent with a solid content of 35%). The pre-wetting temperature is controlled at 35℃. Then, it is pressed by the rollers, and the roll residue is controlled at 65% to obtain the pre-wetted fiber layer. (3) The pre-wetted fiber layer is fed into a hydroentanglement machine for hydroentanglement reinforcement. The hydroentanglement pressure is 12MPa, the hydroentanglement density is 20 slits / cm², and the hydroentanglement angle is 85°, so that the fibers are entangled to form a hydroentangled nonwoven fabric base. The hydroentangled nonwoven fabric base is transported to the heat setting zone through a guide belt. The heat setting temperature is 180℃, the setting time is 35s, and the setting tension is 12N / m to obtain the heat-set base. (4) The heat-set base fabric is functionally finished by a padding machine. The padding liquid consists of the following components: 4 parts by weight of hydroxypropyl chitosan antibacterial agent (molecular weight of 120,000), 5 parts by weight of paraffin phase change microcapsules (particle size of 15 μm) with a phase change temperature of 28°C, 2 parts by weight of softener and 1 part by weight of hexamethylol melamine resin crosslinking agent. The pH value of the padding liquid is 6.5, the padding pressure is 0.25 MPa, and the padding residue is 70%. After padding, the fabric is pre-dried in an infrared pre-drying zone at a temperature of 100°C for 25 seconds, and then baked in a baking zone at a temperature of 160°C for 65 seconds to obtain the functionally finished fabric. (5) The functional finishing fabric is surface finished by a blanket finishing machine. The blanket finishing temperature is 140℃, the blanket pressure is 0.5MPa, and the machine speed is 12m / min, so that the fabric can obtain a soft and smooth surface effect. Finally, the quality is inspected by a fabric inspection machine, and the fabric is packaged in rolls according to the first-class product standard to obtain antibacterial and warm pineapple fiber blended fabric.

[0032] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that in step (4) functional finishing, only chitosan derivative antibacterial agent is used for finishing, and phase change energy storage microcapsules are not added. The other steps are the same as in Example 3.

[0033] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that no chitosan derivative antibacterial agent was added in step (4) of functional finishing. Only phase change energy storage microcapsules were used for finishing. The remaining steps are the same as in Example 3.

[0034] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that silver ion antibacterial viscose fiber is not added in step (1), and only pineapple fiber, combed cotton fiber, Modal fiber and Derong heat-generating fiber are used for blending. The remaining steps are the same as in Example 3.

[0035] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that in step (3), after hydroentanglement reinforcement, no heat setting treatment is performed, and functional finishing is performed directly. The remaining steps are the same as in Example 3.

[0036] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that in step (1), an equal amount of ordinary viscose fiber is used to replace the silver ion antibacterial viscose fiber, and in step (4) the chitosan derivative antibacterial agent is not added in the functional finishing process. The other steps are the same as in Example 3.

[0037] Example of effect Table 1 below shows the performance analysis results of the antibacterial and warm pineapple fiber blended fabrics prepared using Examples 1 to 5 and Comparative Examples 1 to 5 of the present invention.

[0038] Table 1

[0039] A comparison of the antibacterial rate experimental data between the examples and comparative examples reveals that the present invention uses a blend of pineapple fiber, combed cotton fiber, and Modal fiber as the matrix. Through the synergistic effect of silver ion antibacterial viscose fiber and chitosan derivative antibacterial agent, it achieves highly efficient and broad-spectrum antibacterial activity. The silver ions in the silver ion antibacterial viscose fiber bind to proteins on the bacterial cell membrane, disrupting cell membrane integrity and directly killing bacteria. The amino ions on the chitosan derivative antibacterial agent molecular chain generate electrostatic adsorption with the negative charge on the bacterial surface, further inhibiting bacterial proliferation and synergistically enhancing antibacterial durability. Comparative Example 1 only uses chitosan... The chitosan derivative antibacterial agent without phase change energy storage microcapsules resulted in a slightly lower antibacterial rate, but still maintained a high level. Comparative Example 2, without chitosan derivative antibacterial agent, mainly relied on silver ion antibacterial viscose fiber to provide antibacterial properties. Comparative Example 3, without the addition of silver ion antibacterial viscose fiber, showed a significant decrease in antibacterial rate to 85.6%, indicating that a single chitosan derivative antibacterial agent is insufficient to provide adequate antibacterial effect. Comparative Example 5, using ordinary viscose fiber instead of silver ion antibacterial viscose fiber and without chitosan derivative antibacterial agent, achieved an antibacterial rate of only 72.3%, indicating that the synergistic antibacterial effect of silver ions and chitosan is the key to achieving an antibacterial rate of over 99% in this invention.

[0040] A comparison of the experimental data on the warmth retention rates of the embodiments and comparative examples reveals that the irregular cross-shaped cross-section structure of the thermal fiber in this invention can effectively form a static air layer, reducing heat loss and significantly improving the warmth retention performance of the fabric; the phase change energy storage microcapsules maintain skin comfort through phase change heat absorption and release when the ambient temperature changes, synergistically enhancing the warmth retention effect; the hydroentangling reinforcement process enables the fiber to form a three-dimensional entangled structure, further fixing the static air layer; Comparative Example 1, without phase change energy storage microcapsules, has a slightly lower warmth retention rate; Comparative Example 2, without chitosan derivative antibacterial agents but retaining phase change energy storage microcapsules, has a warmth retention rate of 42%, lower than the 50% of Example 3, which may be related to the effect of antibacterial agents on the fiber surface state; Comparative Example 3, without silver ion antibacterial viscose fiber, has a warmth retention rate comparable to Example 3, indicating that silver ion antibacterial viscose fiber has no negative impact on warmth retention performance; Comparative Example 4, without heat setting treatment, has poor fiber entanglement structure stability, with a warmth retention rate of only 38%; Comparative Example 5, without antibacterial finishing but retaining phase change microcapsules, has a warmth retention rate of 48%.

[0041] A comparison of the experimental data on air permeability of the embodiments and comparative examples reveals that the present invention uses a hydroentanglement reinforcement process to form a uniform three-dimensional entangled structure in the fibers, giving the fabric good air permeability; the reasonable ratio of each component fiber ensures the continuity of the air permeability channels; the air permeability of Examples 1 to 5 is all in the range of 850 to 950 mm / s, meeting the requirements of apparel fabrics for air permeability; Comparative Example 4, without heat setting treatment, has an unstable fiber structure and an air permeability of only 820 mm / s.

[0042] A comparison of the experimental data on softness between the examples and the comparative examples reveals that the present invention effectively improves the rough hand feel of pure pineapple fiber fabrics by blending pineapple fiber with combed cotton fiber and Modal fiber; the softness properties of the thermal fiber and the synergistic effect of the phase change energy storage microcapsules further enhance the softness of the fabric; the softening agent and crosslinking agent in the functional finishing process provide the fabric with a stable soft hand feel; the softness of Examples 1 to 5 is all in the range of 3.5 to 4.2 cN, which meets the requirements for softness in apparel fabrics; Comparative Example 4, without heat setting treatment, has a loose fabric structure and a softness of only 3.2 cN.

[0043] In summary, this invention, through the synergistic combination of pineapple fiber with combed cotton fiber, Modal fiber, thermal fiber, and silver ion antibacterial viscose fiber, combined with hydroentanglement reinforcement and functional finishing processes, produces an antibacterial and warm pineapple fiber blended fabric that achieves excellent performance indicators in terms of antibacterial rate, warmth retention, breathability, and softness. Moreover, after multiple washes, the antibacterial rate remains above 98.5%, and the warmth retention rate decreases by no more than 5%, achieving long-lasting stability of antibacterial and warmth retention performance.

Claims

1. A method for preparing an antibacterial and warm pineapple fiber blended fabric, characterized in that, The process includes the following steps: (1) Weigh high-purity raw materials by weight: 35-40 parts by weight of pineapple fiber, 25-30 parts by weight of viscose fiber, 15-20 parts by weight of polyester fiber, 8-12 parts by weight of acrylic fiber and 3-5 parts by weight of spandex filament, and load them in layers according to melting point from low to high, and pre-treat them to obtain a mixed fiber matrix; (2) Place the mixed fiber matrix in a carding machine for opening and carding, control the carding speed to 80m / min, the cylinder speed to 450r / min, and the doffer speed to 35r / min to form a uniform fiber web, and then perform three draws through a drawing frame, with the draw ratio controlled at 6.5-8.0 times and the mixed strip weight controlled at 18g / m to obtain a uniform blended fiber strip; (3) Load the uniform blended fiber strip into a porous quartz distribution plate, with the fiber filling height being 1 / 3 of the diameter of the distribution plate to ensure uniform penetration. After vacuuming, high-purity nitrogen gas is introduced three times for 15 minutes each time for purging. The temperature is then raised to 120℃ and stabilized for 30 minutes under a continuous nitrogen flow. The process is switched to a reaction finishing solution, and the flow rate of the infusion pump is adjusted to ensure the finishing agent penetrates evenly into the fibers. After 45 minutes of penetration treatment, the flow of the finishing agent solution is stopped, and the process is switched to pure nitrogen gas at a rate of 200 mL / min, maintaining this state while allowing the fabric to air dry naturally to room temperature at a rate controlled at 0.5℃ / min. The resulting antibacterial and warm pineapple fiber blended fabric is then obtained.

2. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The pineapple fiber mentioned in step (1) is pineapple fiber with a length of 50 mm and a linear density of 1.5 dtex.

3. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The viscose fiber mentioned in step (1) is a viscose fiber with a length of 38 mm and a linear density of 1.2 dtex.

4. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The polyester fiber mentioned in step (1) is a polyester fiber with a length of 38 mm and a linear density of 1.4 dtex.

5. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The acrylic fiber mentioned in step (1) is an acrylic fiber with a length of 38 mm and a linear density of 1.6 dtex.

6. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The spandex filament in step (1) is spandex filament with a stretch ratio of 3.

5.

7. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The carding machine mentioned in step (2) is a carding machine with a working width of 1.2m.

8. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The filling method described in step (3) is as follows: the fiber is filled into a porous quartz distribution plate, and the fiber filling height is 1 / 3 of the diameter of the distribution plate to ensure uniform penetration.

9. The method for preparing an antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The reaction mixture in step (3) is prepared by precisely mixing antibacterial agent: thermal insulation agent: crosslinking agent: deionized water in a mass ratio of 3:5:2:90, wherein the amount of antibacterial agent is 30g / L, the amount of thermal insulation agent is 50g / L, the amount of crosslinking agent is 20g / L, and the total solution volume is maintained at 500mL.

10. The application of the antibacterial and warm pineapple fiber blended fabric according to claim 1, characterized in that, The antibacterial and warm pineapple fiber blended fabric was heat-set in a setting machine at a setting temperature of 160℃, a setting time of 45s, and an overfeed rate of 12%. After setting, it underwent pre-shrinking treatment with a pre-shrinking shrinkage rate controlled within 3%. Then, it underwent hand finishing at a temperature of 140℃ and a finishing agent dosage of 20g / L.

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