Tianxue cotton mini-jacquard home textile fabric and preparation method thereof

Abstract

The invention discloses a Tianxue cotton mini-jacquard home textile fabric and a preparation method thereof. The preparation method comprises the following steps of preparation of chitin microcapsules, pretreatment of long stapled cotton fibers, electrostatic adsorption of chitin and spinning of the home textile fabric. According to the Tianxue cotton mini-jacquard home textile fabric and the preparation method thereof, the antibacterial effect of the home textile fabric can be improved, and meanwhile the influence on the physical performance and the warm keeping effect of the home textile fabric after antibacterial fibers are added is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of home textile fabrics, in particular to a Tianxue cotton small jacquard home textile fabric and a preparation method thereof. Background Art

[0002] Tianxue cotton dobby home textile fabric is a high-end home textile fabric made of Tianxue cotton as the main raw material and woven using dobby technology. It is often used in bedding, curtains, sofa covers, etc. Dobby weave is mostly used for thin fabrics, with a tight and delicate appearance and a not very prominent pattern. Dobby weave is a weave with various small patterns on the surface of the fabric using a dobby loom through the changes of two or more fabric structures. The loom weaves small patterns on the fabric. The pattern is delicate but not complicated, which enhances the beauty and texture of the fabric. The small geometric or floral patterns formed by the dobby process have a strong sense of hierarchy and an elegant visual effect.

[0003] Tianxue cotton is a high-quality cotton fiber, known for its softness, fineness, breathability and moisture absorption, and is often used in high-end textiles. Among them, Tianxue cotton mainly uses long-staple cotton (such as Egyptian cotton, Pima cotton, and Xinjiang long-staple cotton), which has better fiber length and strength than ordinary cotton. The fiber length of long-staple cotton is usually above 33 mm, making Tianxue cotton fabric softer and smoother. The fiber has high fineness and the fabric feels delicate, making it suitable for close-fitting use.

[0004] As cotton fiber, Tianxue cotton itself has poor antibacterial properties and is prone to breeding bacteria and mold. Therefore, many processes now add chitin fiber to blend it to improve the antibacterial properties of the fabric. Chitin fiber is a natural polysaccharide substance. There are a large number of fine grooves along the longitudinal surface of chitin fiber, and the core layer has many fine gaps, which can promote the capillary effect, so that the absorbed sweat can be quickly dissipated, effectively preventing the generation of bacteria, thereby enhancing the antibacterial effect. However, since the strength of chitin fiber is usually lower than that of long-staple cotton fiber, mixing may reduce the strength and durability of the overall material. In addition, the addition of chitin fiber will affect the proportion of long-staple cotton fiber in the fabric, thereby reducing its warmth retention effect. Summary of the invention

[0005] The present application provides a Tianxue cotton jacquard home textile fabric and a preparation method thereof, which are used to improve the antibacterial effect of the home textile fabric and reduce the impact of the antibacterial fiber on the physical properties and warmth retention effect of the home textile fabric after addition.

[0006] The present application provides a method for preparing a Tianxue cotton jacquard home textile fabric, which comprises the following steps: S1, preparation of a chitosan solution: dissolving chitosan powder in an acetic acid solution, filtering the solution to remove impurities, and forming a chitosan solution; S2, preparation of a PCM emulsion: heating and melting the PCM material, then adding an emulsifier, and stirring evenly; slowly adding the chitosan solution to the melted PCM material, and stirring at a high speed or ultrasonically treating to form an oil-in-water emulsion; S3, complex coagulation of chitosan, adding a sodium hydroxide solution, and adjusting the solution The pH value is adjusted to deprotonate the amino group of chitin; gelatin is dissolved in deionized water to form a transparent solution, and the gelatin solution is slowly added to the PCM emulsion to make chitin and gelatin undergo complex coagulation to obtain a mixed solution of chitosan microcapsules; S4, post-treatment of chitosan microcapsules: a cross-linking agent is added to the mixed solution of chitosan microcapsules, and the mixture is stirred at room temperature to solidify the chitosan shell; the microcapsules are washed with deionized water for multiple times to remove the residual cross-linking agent and emulsifier; the washed microcapsules are dried at room temperature to obtain chitosan microcapsules.

[0007] By adopting the above technical solution, after the long-staple cotton fiber is loaded with PCM microcapsules, it can absorb, store and release heat, thereby regulating the temperature of the environment around the fiber. At high temperatures, it absorbs heat to reduce the perceived temperature; at low temperatures, it releases heat to provide a warming effect. When the ambient temperature rises, the PCM changes from a solid state to a liquid state, absorbing heat; when the ambient temperature drops, the PCM changes from a liquid state to a solid state, releasing heat. The chitosan and gelatin microcapsules wrap the PCM inside to prevent it from leaking, while allowing heat to be transferred through the outer shell. In addition, chitosan itself has natural antibacterial properties that can inhibit the growth of bacteria and fungi. The long-staple cotton fiber loaded with chitosan microcapsules has a lasting antibacterial effect.

[0008] In addition, long-staple cotton fiber itself is soft, breathable and has good moisture absorption. Chitosan has good moisture retention and biocompatibility, which can improve the skin care performance of long-staple cotton fiber. Therefore, it is suitable for use in underwear to reduce skin dryness and irritation. When loaded with PCM microcapsules, its comfort can be further improved. In an environment with large temperature changes, it can keep the human skin temperature relatively stable and reduce heat stress.

[0009] In addition, unlike the co-spinning of chitin fiber and long-staple cotton fiber, the chitin shell is solidified by a cross-linking agent, which has high mechanical strength and chemical stability. The microcapsules are combined with the fiber through electrostatic adsorption to ensure its firm attachment to the fiber surface.

[0010] Preferably, the pretreatment of the long-staple cotton fiber includes the following steps: soaking the long-staple cotton fiber in deionized water to remove impurities and grease on the surface; washing the fiber with a detergent (neutral soap solution), and then rinsing it with deionized water; adding an anionic modifier to treat the fiber, and reacting it at 50-70°C for 1-2 hours; after the reaction is completed, rinsing the long-staple cotton fiber with deionized water to remove unreacted modifiers, and adjusting the pH>8.

[0011] Preferably, the electrostatic adsorption of chitosan comprises the following steps: dispersing the chitosan microcapsules in a buffer solution, and using ultrasonic treatment to uniformly disperse the microcapsules, and using a dilute hydrochloric acid solution to adjust the pH value of the suspension so that the microcapsules are positively charged, and adding a surfactant and a dispersant, and continuing to stir or ultrasonically treat to ensure that the suspension is uniform and stable, so as to obtain a chitosan microcapsule suspension; immersing the pretreated long-staple cotton fiber in the chitosan microcapsule suspension, and using ultrasonic treatment to promote the contact between the microcapsule and the fiber for a controlled time of 1-5 hours, taking the long-staple cotton fiber out of the suspension, and gently washing it with deionized water to remove the unadsorbed microcapsules; drying the long-staple cotton fiber at 40-70° C.; and obtaining modified long-staple cotton fiber.

[0012] By adopting the above technical scheme, the present application disperses chitosan microcapsules in a deionized buffer solution, uses ultrasonic treatment to evenly disperse the microcapsules to avoid agglomeration, and under acidic conditions (pH <6), the amino groups of chitosan will be protonated (-NH3⁺), so that the surface of the microcapsules is positively charged, and then a small amount of surfactant or dispersant is added to prevent the microcapsules from agglomerating. During the pretreatment of long-staple cotton fibers, the fibers are treated with an anionic modifier and the pH is adjusted to be greater than 8. Since the fiber surface and the microcapsules are oppositely charged, the microcapsules will be adsorbed on the fiber surface by electrostatic action. The adsorption time is controlled (usually 30 minutes to 2 hours) to ensure that the microcapsules are evenly distributed. The microcapsules obtained by the above method are evenly distributed and firmly bound. In addition, the process is environmentally friendly and does not require the use of a large amount of chemical reagents. Not only can the chitosan microcapsules be effectively loaded on the long-staple cotton fibers, giving them antibacterial and heat-insulating functions, but also the original properties of the fibers are maintained.

[0013] Preferably, the weaving of the home textile fabric includes the following operating steps: the modified long-staple cotton fiber is subjected to a roving process, a spun yarn process, a bobbin winding process, a twisting process, and a reeling process to obtain the yarn of the modified long-staple cotton fiber; the yarn of the modified long-staple cotton fiber is subjected to warping, sizing, drawing in, and weaving to finally complete the weaving, and the weaving adopts a dobby-arm control of a small jacquard loom with 16 or 20 heald frames to achieve the weaving of the home textile fabric.

[0014] Preferably, in the preparation process of the PCM emulsion, the PCM material includes one or more of n-octadecane, n-eicosane, n-docosane, lauric acid, palmitic acid, stearic acid, polyurethane, and polyvinyl alcohol.

[0015] By adopting the above technical scheme, the phase change materials used in this application mainly include paraffin PCM materials, fatty acid PCM materials and solid-solid PCM materials. Among them, n-octadecane, n-eicosane and n-docosane are paraffin PCM materials with a phase change temperature range of 18-40°C, which is suitable for the comfortable temperature range of the human body, and has high latent heat and good thermal stability. Lauric acid, palmitic acid and stearic acid belong to fatty acid PCM materials with a phase change temperature range of 20-70°C. Polyurethane and polyvinyl alcohol solid-solid PCM materials avoid leakage problems because no liquid phase occurs during the phase change process. Although they have good thermal stability, they have low latent heat.

[0016] Preferably, in the preparation process of the PCM emulsion, the emulsifier includes one or more of Tween 20, Tween 80, Span 20, Span 80, sodium lauryl sulfate, polyethylene glycol, lecithin, and polyvinyl alcohol.

[0017] Preferably, in the post-treatment of the chitosan microcapsules, the cross-linking agent includes one or more of glutaraldehyde, epichlorohydrin, sodium tripolyphosphate, carbodiimide, and dialdehyde starch.

[0018] By adopting the above technical scheme, the present application adopts glutaraldehyde as a cross-linking agent, which can react with the amino group in chitosan to form a stable cross-linked structure. Epichlorohydrin can be used for the chemical cross-linking of chitosan, which can improve the stability of the material. Sodium tripolyphosphate enhances the structural stability of chitosan through ionic cross-linking. Carbodiimide can activate the reaction between carboxyl and amino groups as a cross-linking of biomaterials, thereby improving the stability with chitosan. Dialdehyde starch is a cross-linking agent of natural origin, which is environmentally friendly and has good biocompatibility, and can improve the stability with chitosan.

[0019] Preferably, the detergent includes one or more of sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether.

[0020] By adopting the above technical solution, the present application adopts a neutral surfactant for washing, and avoids using detergents containing strong acid, strong alkali or bleaching ingredients to avoid damaging the softness and strength of long-staple cotton fibers.

[0021] Preferably, the anion modifier includes one or more of citric acid, maleic acid, and acrylic acid.

[0022] By adopting the above technical scheme, the present application can graft carboxyl groups onto the surface of long-staple cotton fibers through the impregnation method of citric acid, maleic acid and acrylic acid.

[0023] On the other hand, the present application provides a Tianxue cotton dobby home textile fabric, which is made by the above-mentioned Tianxue cotton dobby home textile fabric preparation method.

[0024] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. This application uses PCM microcapsules loaded on long-staple cotton fibers, which can absorb, store and release heat, thereby regulating the temperature of the environment around the fibers. At high temperatures, it absorbs heat to reduce the perceived temperature; at low temperatures, it releases heat to provide a warming effect. When the ambient temperature rises, the PCM changes from solid to liquid and absorbs heat; when the ambient temperature drops, the PCM changes from liquid to solid and releases heat. The chitin and gelatin microcapsules wrap the PCM inside to prevent it from leaking, while allowing heat to be transferred through the outer shell.

[0025] 2. This application uses chitosan microcapsules, which have good moisture retention and biocompatibility, can improve the skin care performance of long-staple cotton fibers, and are suitable for use in underwear to reduce skin dryness and irritation. When loaded with PCM microcapsules, its comfort can be further improved. In an environment with large temperature changes, the temperature of the human skin is kept relatively stable, reducing heat stress.

[0026] 3. The shell of the chitosan capsule used in the present application is formed by chitosan, which has natural antibacterial properties and can inhibit the growth of bacteria and fungi. The long-staple cotton fiber loaded with chitosan microcapsules has a lasting antibacterial effect.

[0027] 4. The method used in this application is different from the co-spinning of chitin fiber and long-staple cotton fiber. The chitin shell is solidified by a cross-linking agent and has high mechanical strength and chemical stability. The microcapsule is combined with the fiber through electrostatic adsorption to ensure its firm attachment to the fiber surface.

[0028] 5. The present application adopts the method of protonating the amino group of chitosan microcapsules under acidic conditions to make the surface of the microcapsules positively charged, and then adding a small amount of surfactant or dispersant to prevent the microcapsules from agglomerating. In the pretreatment process of long-staple cotton fibers, an anionic modifier is used to treat the fibers. As a result, the fiber surface and the microcapsules are oppositely charged, and the microcapsules are adsorbed on the fiber surface through electrostatic action. The microcapsules obtained by the above method are evenly distributed and firmly bound. In addition, the process is environmentally friendly and does not require the use of a large amount of chemical reagents. Not only can the chitosan microcapsules be effectively loaded on the long-staple cotton fibers, giving them antibacterial and heat-insulating functions, but also the original properties of the fibers are maintained. DETAILED DESCRIPTION

[0029] The present application provides a Tianxue cotton jacquard home textile fabric and a preparation method thereof, which are used to improve the antibacterial effect of the home textile fabric and reduce the influence of the antibacterial fiber on the physical properties and warmth retention effect of the home textile fabric after being added.

[0030] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products, or devices.

[0032] raw material Long-staple cotton: Long-staple cotton mainly includes Egyptian cotton produced in Egypt, Pima cotton produced in the southwestern United States, Sea Island cotton produced in the southeastern coast of the United States, and Xinjiang long-staple cotton produced in Xinjiang, China. The long-staple cotton used in the following examples of this application is Xinjiang long-staple cotton from China.

[0033] PCM materials: The PCM phase change materials used in the following embodiments of the present application are n-octadecane, n-eicosane, n-docosane, lauric acid, palmitic acid, stearic acid, polyurethane, and polyvinyl alcohol, all of which are currently commercially available.

[0034] Emulsifier: The emulsifiers used in the following examples of the present application are Tween 20, Tween 80, Span 20, Span 80, sodium lauryl sulfate, polyethylene glycol, lecithin, and polyvinyl alcohol, all of which are currently commercially available.

[0035] Cross-linking agent: The cross-linking agents used in the following examples of the present application are glutaraldehyde, epichlorohydrin, sodium tripolyphosphate, carbodiimide, and dialdehyde starch, all of which are currently commercially available.

[0036] Detergent: The detergents used in the following examples of this application are sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether, both of which are currently commercially available.

[0037] Anion modifier: The anion modifiers used in the following examples of the present application are citric acid, maleic acid, and acrylic acid, all of which are currently commercially available.

[0038] Example

[0039] Example 1

[0040] Preparation of chitosan microcapsules S1. Preparation of chitosan solution: 500 g of chitosan powder was added to 2% acetic acid solution and stirred until completely dissolved to form a transparent chitosan solution; and the solution was filtered to remove undissolved impurities; S2. Preparation of PCM emulsion: heat 320 g of n-octadecane to 28°C-35°C to melt, add 80 g of Tween 20 to the melted n-octadecane, and stir evenly; slowly add the prepared chitosan solution to the melted n-octadecane, and perform ultrasonic treatment for 1 hour to form an oil-in-water (O / W) emulsion until the emulsion is uniform and stable; S3, complex coagulation of chitosan, adding 48g of sodium hydroxide (NaOH) solution, and measuring the pH of the emulsion, adjusting the pH value to 8, so that the amino group of chitosan is deprotonated; dissolving 160g of gelatin in 500mL of deionized water to form a transparent solution, and slowly adding the gelatin solution to the PCM emulsion with adjusted pH value, while stirring at a low speed, adjusting the pH value of the mixed solution to 4-5, so that chitosan and gelatin undergo complex coagulation to form a microcapsule shell; and continuing to stir to ensure that the complex coagulation reaction is fully carried out to obtain a mixed solution of chitosan microcapsules; S4. Post-treatment of chitosan microcapsules: adding glutaraldehyde to the mixed solution of chitosan microcapsules, stirring at room temperature for 2 hours to solidify the chitosan shell, and separating the microcapsules by centrifugation to remove unreacted substances; washing the microcapsules with deionized water for 3 times to remove residual cross-linking agent and emulsifier; drying the washed microcapsules at room temperature for 2 hours to obtain chitosan microcapsules.

[0041] Pretreatment of long-staple cotton fibers 800 g of the treated long-staple cotton fiber was soaked in 2 L of deionized water to remove surface impurities and grease; the long-staple cotton fiber was cleaned with sodium dodecylbenzene sulfonate and then rinsed with deionized water; citric acid was added to treat the long-staple cotton fiber and reacted at 70°C for 2 hours; after the reaction, the long-staple cotton fiber was rinsed with deionized water to remove the unreacted modifier, and the pH was adjusted to 9.

[0042] Electrostatic adsorption of chitin 100 g of the chitosan microcapsules coated with phase change materials prepared above were dispersed in deionized water, and ultrasonic treatment was performed to uniformly disperse the microcapsules. The pH of the suspension was adjusted to 6 with a dilute hydrochloric acid solution to make the microcapsules positively charged. Polyethylene glycol was added and ultrasonic treatment was continued to ensure that the suspension was uniform and stable, thereby obtaining a chitosan microcapsule suspension. 480 g of pretreated long-staple cotton fiber was immersed in a chitosan microcapsule suspension, and ultrasonic treatment was performed to promote the contact between the microcapsules and the fiber for a controlled time of 5 hours. The long-staple cotton fiber was taken out from the suspension, and gently washed with deionized water to remove the unabsorbed microcapsules; the long-staple cotton fiber was dried at 50°C to obtain modified long-staple cotton fiber.

[0043] Weaving of home textile fabrics The modified long-staple cotton fiber is obtained into the yarn of the modified long-staple cotton fiber through the roving process, the spun yarn process, the winding process, the twisting process and the reeling process, which specifically include uniformly stretching the modified long-staple cotton fiber sliver, stretching and thinning, appropriately twisting the stretched sliver to make the yarn have a certain strength, and finally forming; then winding the tube into a bobbin with large capacity, good forming and a certain density, removing some defects and impurities on the yarn, improving the quality of the yarn, and continuing to twist, using two or more single yarns, after merging and twisting, to form a high-strength and well-structured strand, winding the twisted strand on the bobbin to make a tube of a certain size and shape, and then reeling the yarn of the wound bobbin into a hank according to a specified length.

[0044] The yarn of modified long-staple cotton fiber is warped, sizing, threaded, and put on the machine to finally weave the cloth, which specifically includes three types of warping: original yarn warping, colored yarn warping, and partial warping. The warp yarn after warping or dyeing is then hung on the creel of the sizing machine, and passed through three auxiliary accessories such as dropper pieces, healds, and reeds to facilitate the weaving of dropper pieces. In this application, the weaving adopts the multi-arm of a small jacquard loom to control 16 or 20 heald frames to achieve the weaving of home textile fabrics, and then the movement law of the warp is determined by the lifting and lowering of the heald frame by the blade in the multi-arm. Finally, the plain weave is used as the ground structure to obtain a Tianxue cotton small jacquard home textile fabric with a finer and more delicate pattern than the large jacquard fabric.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that, in the preparation process of chitosan microcapsules, the selection of PCM material, the selection of emulsifier and the selection of cross-linking agent are different, and the following table is compiled according to different selections.

[0047] Table 1. Raw material composition of chitosan microcapsules

[0048]

[0049] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that chitosan fiber and long-staple cotton fiber are blended and woven to obtain the Tianxue cotton jacquard home textile fabric.

[0050] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the Tianxue cotton jacquard home textile fabric is obtained by directly weaving long-staple cotton fibers without adding other modification methods.

[0051] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that, in the preparation process of chitosan microcapsules, no PCM emulsion is added, and chitosan microcapsules are obtained by directly coagulating chitosan and gelatin.

[0052] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that, in the preparation process of chitin microcapsules, the PCM emulsion is coated with gelatin without adding chitin fibers to obtain PCM emulsion microcapsules.

[0053] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that in the pretreatment step of the long-staple cotton fiber, the long-staple cotton fiber was not treated with anionic modifiers; in the electrostatic adsorption step of chitin, the pH value of the suspension was not adjusted with dilute hydrochloric acid solution to make the microcapsules positively charged.

[0054] Performance testing In order to further study the performance parameters of Tianxue cotton jacquard home textile fabrics, the present application further carries out the following examples for verification.

[0055] 1. Fabric wear resistance The experiment uses the flat friction method to determine the friction mass loss of Tianxue cotton jacquard home textile fabric. The greater the mass loss rate, the better the wear resistance of the fabric. Take the above home textile fabric sample and install it on the flat tester fixture for reciprocating plane friction. The sample fixture can rotate freely around its axis perpendicular to the horizontal plane to determine the wear resistance of the fabric. The inner diameter of the fixture is 95 mm±1mm, and it can firmly clamp a circular sample with an area of ​​100cm. Reciprocating test bench, reciprocating speed 125 times / min±5 times / min, stroke 25mm±2mm. The rotating platform is installed on the reciprocating test bench to fix the flat grinding fixture. For every 100 reciprocating movements of the test bench, the flat fixture just rotates around its central axis. The wear resistance of the home textile fabric is tested for 100, 300, and 800 turns in turn, and the mass loss percentage is calculated and sorted into the following table.

[0056] 2. Fabric mechanical properties Fabric tensile strength refers to the phenomenon that the fabric will break when it is subjected to a certain tensile load. It is tested using a fabric strength testing machine under standard atmospheric conditions (temperature is (20±2)℃, relative humidity is (65±2)%. For each sample, 5 50×200mm fabrics are cut in the longitudinal and transverse directions. The fabric clamping distance is set to 15mm and the stretching speed is 100mm / min. Record the experimental results, take the average value, and organize them into the following table.

[0057] 3. Fabric bursting performance Bursting refers to the phenomenon that a part of a fabric is damaged by an external force perpendicular to the plane of the fabric. The higher the bursting strength, the better the bursting performance of the fabric. Take a piece of the home textile fabric prepared above, cut 5 specimens, mark the front and back sides, clamp the specimen with the back side facing up on the clamp to ensure that the specimen is flat, tension-free, and wrinkle-free, and select a steel ball with a diameter of 25mm. Install the push rod and the clamp on the tester, push the push rod downward at 300mm / min to break the specimen, and test five groups, record the force value and take the average value, and organize it into the following table.

[0058] 4. Antibacterial performance test: According to the standard test method, the antibacterial test was conducted on Tianxue cotton jacquard home textile fabrics. The inoculated bacteria were Staphylococcus aureus and Escherichia coli. The sterilization rate was calculated by counting the number of surviving bacteria. The concentration of Staphylococcus aureus in this test was 1.50×106 CFU, and the concentration of Escherichia coli in this test was 3.76×106 CFU; the average sterilization rate was integrated into the following table.

[0059] 5. Thermal insulation performance test: The test shall be carried out in accordance with the "Test Method for Thermal Insulation Performance of Textiles". The flat-plate constant temperature difference heat dissipation method shall be adopted to calculate the percentage of the difference between the heat dissipation when there is no sample and the heat dissipation when there is a sample and the ratio of the heat dissipation when there is no sample.

[0060] 6. Heat transfer performance test: "Textile Heat Transfer Performance Test Method Flat Plate Method" is used for testing to obtain the heat transfer coefficient.

[0061] Table 2. Performance test table of Examples 1-11 and Comparative Examples 1-5

[0062]

[0063] According to Examples 1-11, Example 10 is the best example, wherein n-eicosane is selected as the PCM material, sodium dodecyl sulfate is selected as the emulsifier, and glutaraldehyde is selected as the cross-linking agent. It can be obtained that the fabric has better wear resistance, more excellent mechanical properties, and strong bursting performance. At the same time, its antibacterial performance and thermal insulation performance have better performance.

[0064] In addition, in the analysis between Example 10 and Comparative Example 1, in Comparative Example 1, chitosan fiber and long-staple cotton fiber are blended and spun to obtain Tianxue cotton jacquard home textile fabric. Therefore, the physical properties of the comparative example are worse than those of Example 10. Although it has a similar antibacterial effect, its warmth retention effect is worse.

[0065] And in comparative example 2, the long-staple cotton fiber is directly woven to obtain the Tianxue cotton jacquard home textile fabric, without adding other modification methods. Its mechanical properties are improved compared with comparative example 1, but the antibacterial effect is not good, but the thermal insulation effect is improved compared with comparative example 1. And its thermal insulation effect is different from that of the embodiment, which is because the phase change material is added in the embodiment. And it can be obtained from the comparative analysis with comparative example 3.

[0066] In Comparative Example 3, during the preparation of chitosan microcapsules, no PCM emulsion was added, and chitosan microcapsules were obtained by directly coagulating chitosan and gelatin.

[0067] Similarly, in the preparation process of chitosan microcapsules in Comparative Example 4, PCM emulsion was coated with gelatin without adding chitosan fibers to obtain PCM emulsion microcapsules, which could not have a stronger antibacterial effect.

[0068] This is mainly because after the PCM microcapsules are loaded on the long-staple cotton fibers, they can absorb, store and release heat, thereby regulating the temperature of the environment around the fibers. The chitin and gelatin microcapsules wrap the PCM inside to prevent leakage while allowing heat to be transferred through the shell. The chitin microcapsules have good moisture retention and biocompatibility, which can improve the skin care properties of long-staple cotton fibers, keep the temperature of human skin relatively stable in an environment with large temperature changes, and reduce heat stress. In addition, the shell of the chitosan capsule is formed by chitosan, which itself has natural antibacterial properties and can inhibit the growth of bacteria and fungi. Long-staple cotton fibers loaded with chitosan microcapsules have a long-lasting antibacterial effect.

[0069] Finally, compared with Comparative Example 5, in the pretreatment step of the long-staple cotton fiber, the long-staple cotton fiber was not treated with an anionic modifier; in the electrostatic adsorption step of chitin, the pH value of the suspension was not adjusted with a dilute hydrochloric acid solution to make the microcapsules positively charged. It is impossible to fix the chitin microcapsules on the long-staple cotton fiber, and it is difficult to give it antibacterial and heat-insulating functions while maintaining the original properties of the fiber.

[0070] In addition, in the pretreatment process of long-staple cotton fibers, the neutral detergents used in the present application include sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether. A neutral surfactant is used for washing, and detergents containing strong acid, strong alkali or bleaching ingredients are avoided to avoid damaging the softness and strength of the long-staple cotton fibers. The use of sodium dodecylbenzene sulfonate has better experimental results.

[0071] In addition, the anionic modifier includes one or more of citric acid, maleic acid, and acrylic acid. Citric acid, maleic acid, and acrylic acid can all be used to graft carboxyl groups onto the surface of long-staple cotton fibers through an impregnation method. Among them, citric acid has better physical properties and better environmental protection.

[0072] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments. And the above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0074] This specification is merely an exemplary description of the present application and is deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application is intended to include these modifications and variations.

Claims

1. A method for preparing a Tianxue cotton jacquard home textile fabric, characterized in that: The following steps are involved: Preparation of chitosan microcapsules, pretreatment of long-staple cotton fibers, electrostatic adsorption of chitosan, and weaving of home textile fabrics; The preparation process of the chitosan microcapsules includes the following steps: S1. Preparation of chitosan solution: dissolving chitosan powder in acetic acid solution, and filtering the solution to remove impurities to form a chitosan solution; S2. Preparation of PCM emulsion: heating and melting the PCM material, then adding an emulsifier and stirring evenly; slowly adding the chitosan solution into the melted PCM material, stirring at high speed or ultrasonic treatment to form an oil-in-water emulsion; S3, complex coagulation of chitosan, adding sodium hydroxide solution, and adjusting the pH value of the solution to deprotonate the amino group of chitosan; dissolving gelatin in deionized water to form a transparent solution, and slowly adding the gelatin solution to the PCM emulsion to cause complex coagulation of chitosan and gelatin to obtain a mixed solution of chitosan microcapsules; S4, post-treatment of chitosan microcapsules: adding a cross-linking agent to the mixed solution of chitosan microcapsules, and stirring at room temperature to solidify the chitosan shell; The microcapsules are washed with deionized water for multiple times to remove the residual crosslinking agent and emulsifier; the washed microcapsules are dried at room temperature to obtain chitosan microcapsules.

2. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 1, characterized in that: The pretreatment of the long-staple cotton fiber comprises the following steps: The long-staple cotton fiber is soaked in deionized water to remove impurities and grease on the surface; the fiber is cleaned with detergent and then rinsed with deionized water; an anionic modifier is added to treat the fiber and reacted at 50-70°C for 1-2 hours; after the reaction is completed, the long-staple cotton fiber is rinsed with deionized water to remove unreacted modifier and the pH is adjusted to 8.

3. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 2, characterized in that: The electrostatic adsorption of chitin comprises the following operating steps: The chitosan microcapsules are dispersed in a buffer solution, and ultrasonic treatment is performed to uniformly disperse the microcapsules, and a dilute hydrochloric acid solution is used to adjust the pH value of the suspension so that the microcapsules are positively charged, and a surfactant and a dispersant are added, and stirring or ultrasonic treatment is continued to ensure that the suspension is uniform and stable, thereby obtaining a chitosan microcapsule suspension; The pretreated long-staple cotton fiber is immersed in the chitosan microcapsule suspension, and ultrasonic treatment is performed to promote the contact between the microcapsule and the fiber for a controlled time of 1-5 hours. The long-staple cotton fiber is taken out from the suspension, and gently washed with deionized water to remove the unabsorbed microcapsules; the long-staple cotton fiber is dried at 40-70° C. to obtain the modified long-staple cotton fiber.

4. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 3, characterized in that: The weaving of the home textile fabric comprises the following steps: The modified long-staple cotton fiber is subjected to a roving process, a spun yarn process, a bobbin winding process, a twisting process, and a reeling process to obtain the modified long-staple cotton fiber yarn; the modified long-staple cotton fiber yarn is subjected to warping, sizing, drawing in, and weaving to finally complete the weaving, and the weaving adopts a dobby-arm control of a small jacquard loom with 16 or 20 heald frames to achieve the weaving of home textile fabrics.

5. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 1, characterized in that: In the preparation process of the PCM emulsion, the PCM material includes one or more of n-octadecane, n-eicosane, n-docosane, lauric acid, palmitic acid, stearic acid, polyurethane, and polyvinyl alcohol.

6. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 2, characterized in that: In the preparation process of the PCM emulsion, the emulsifier includes one or more of Tween 20, Tween 80, Span 20, Span 80, sodium lauryl sulfate, polyethylene glycol, lecithin, and polyvinyl alcohol.

7. The method for preparing the Tianxue cotton dobby home textile fabric according to claim 1, characterized in that: In the post-treatment of the chitosan microcapsules, the cross-linking agent includes one or more of glutaraldehyde, epichlorohydrin, sodium tripolyphosphate, carbodiimide, and dialdehyde starch.

8. The method for preparing the Tianxue cotton dobby home textile fabric according to claim 2, characterized in that: The detergent comprises one or more of sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether.

9. The method for preparing the Tianxue cotton jacquard home textile fabric according to claim 2, characterized in that: The anion modifier includes one or more of citric acid, maleic acid, and acrylic acid.

10. A Tianxue cotton jacquard home textile fabric, characterized in that: The fabric is made by the preparation method of the Tianxue cotton jacquard home textile fabric as described in claims 1-9.

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