A new multifunctional composite knitted fabric and a production process method thereof

Abstract

This application provides a novel multifunctional composite knitted fabric and its production process, applicable to the field of knitted fabric technology. It comprises the following raw materials in parts by weight: 7-13 parts heat-generating fiber, 15-28 parts bio-based fiber, 5-13 parts hydrophobic coating, 12-21 parts spandex fiber, 10-13 parts chitosan, and 10-15 parts chitosan solvent. The spandex fiber, the heat-generating fiber, and the bio-based fiber are twisted together to form a composite yarn. This application involves twisting the heat-generating fiber, bio-based fiber, and spandex fiber to form a composite yarn. Chitosan is then dissolved in chitosan solvent to form a chitosan solution. The chitosan solution and hydrophobic coating are uniformly applied to the exterior of the composite yarn, increasing its water resistance and reducing water-induced swelling of the fibers. The elasticity of the spandex increases the overall extensibility of the composite yarn, reducing the possibility of shrinkage.

Description

Technical Field

[0001] This application relates to the field of knitted fabric technology, and in particular to a novel multifunctional composite knitted fabric and its production process. Background Technology

[0002] Knitted fabrics are woven fabrics created by bending yarns into loops and interlocking them using knitting needles. The difference between knitted and woven fabrics lies in the form of the yarns within the fabric. Knitting is divided into weft knitting and warp knitting. Knitted fabrics are widely used in clothing fabrics and linings, home textiles, and other products, and are loved by consumers.

[0003] While existing knitted fabrics offer advantages such as good stretchability and breathability, they also have the potential to shrink after fabric formation due to the inherent swelling properties of the knitted yarn fibers. Current methods for addressing this shrinkage often involve mercerizing to induce pre-swelling of the fibers, thus reducing the likelihood of swelling in the finished fabric. However, existing mercerizing techniques are complex, requiring treatment with caustic soda, which results in lower resistance to acidic substances and can affect some pigments, leading to poor fabric appearance. Therefore, this application provides a novel multifunctional composite knitted fabric and its manufacturing process to solve this problem. Summary of the Invention

[0004] The purpose of this application is to provide a novel multifunctional composite knitted fabric and its production process, aiming to solve the problem that existing methods for treating fabric shrinkage often involve mercerizing to induce fiber swelling in advance, thereby reducing the possibility of swelling in the finished fabric. However, existing mercerizing technology is relatively complex, requiring treatment of the fabric with caustic soda, which results in lower resistance of the fabric to acidic substances and affects some pigments, leading to poor fabric appearance.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] This application provides a novel multifunctional composite knitted fabric, comprising the following raw materials in parts by weight:

[0007] 7-13 parts of heating fiber, 15-28 parts of bio-based fiber, 5-13 parts of hydrophobic coating, 12-21 parts of spandex fiber, 10-13 parts of chitosan, and 10-15 parts of chitosan solvent.

[0008] The spandex fiber, the heating fiber, and the bio-based fiber are twisted together to form a composite yarn. The chitosan and the chitosan solvent are mixed to form a chitosan solution. The hydrophobic coating and the chitosan solution are applied to the composite yarn.

[0009] Furthermore, the hydrophobic coating is expanded polytetrafluoroethylene (ePTFE), which is used to create multiple spaces in the micro-nano structure inside the composite yarn.

[0010] Furthermore, the chitosan solvent is acetic acid, which is used to dissolve the chitosan, and the concentration of the acetic acid is 1%.

[0011] Furthermore, the heating fiber is made of polyester and ceramic powder, the ceramic powder being used to absorb infrared radiation.

[0012] Furthermore, the bio-based fiber is polylactic acid fiber, which has high crystallinity to block external heat.

[0013] Furthermore, the raw materials for preparing the novel multifunctional composite knitted fabric include, by weight, 12 parts of heat-generating fiber, 17 parts of spandex fiber, 23 parts of bio-based fiber, 11 parts of hydrophobic coating, 10 parts of chitosan, and 12 parts of chitosan solvent.

[0014] This application also provides a novel manufacturing process for multifunctional composite knitted fabrics, including the following steps:

[0015] S1. Spandex fiber, heat-generating fiber and polylactic acid fiber are spirally twisted according to the weight parts to obtain composite yarn;

[0016] S2. Chitosan and acetic acid are mixed to prepare a chitosan solution, and the chitosan solution is coated onto the composite spinning yarn and cooled.

[0017] S3. After melting expanded polytetrafluoroethylene, apply it to the outermost layer of the composite yarn and let it cool.

[0018] S4. Knit the composite yarn using a knitting machine to form a knitted fabric.

[0019] Furthermore, the expanded polytetrafluoroethylene method includes: using CFC-113 solvent, using organic peroxide as an initiator, or using an azo initiator or ion radiation initiation, and controlling the average molecular weight of the copolymer by adding a chain transfer agent such as methanol, so as to form expanded polytetrafluoroethylene.

[0020] Furthermore, the method of using the chitosan solution includes: placing 10 parts of chitosan in 12 parts of acetic acid to obtain a chitosan solution, applying the chitosan solution to the composite spinning thread, and then placing the composite spinning thread coated with the chitosan solution into an oven at 40 degrees Celsius.

[0021] Furthermore, the method for preparing polylactic acid fiber includes: fermenting corn starch to form lactic acid, and then producing it through polycondensation and melt spinning.

[0022] This application provides a novel multifunctional composite knitted fabric and its manufacturing process, which has the following beneficial effects:

[0023] 1. This application involves twisting heat-generating fibers, bio-based fibers, and spandex fibers to form a composite yarn. Chitosan is then dissolved in a chitosan solvent to form a chitosan solution. The chitosan solution and a hydrophobic coating are then uniformly applied to the outside of the composite yarn, which increases the waterproofness of the composite yarn and reduces the swelling of individual fibers caused by water. The elasticity of spandex increases the overall extensibility of the composite yarn and reduces the possibility of shrinkage.

[0024] 2. This application uses expanded polytetrafluoroethylene as a hydrophobic coating. It is a polymer material with stable chemical properties and does not easily react with strong acids and alkalis, which increases the stability of the composite fabric during use.

[0025] 3. This application uses acetic acid to dissolve chitosan. When using it, since chitosan is insoluble in water, it is dissolved by acetic acid, which facilitates dissolution. At the same time, the acidity of acetic acid is relatively weak, which reduces the impact of the chitosan solution on the composite fabric. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the steps of a novel multifunctional composite knitted fabric production process according to an embodiment of this application.

[0027] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] One embodiment of this application discloses a novel multifunctional composite knitted fabric comprising the following raw materials in parts by weight:

[0031] 7-13 parts of heating fiber, 15-28 parts of bio-based fiber, 5-13 parts of hydrophobic coating, 12-21 parts of spandex fiber, 10-13 parts of chitosan, and 10-15 parts of chitosan solvent.

[0032] Spandex fiber, heat-generating fiber and bio-based fiber are twisted together to form a composite yarn. Chitosan and chitosan solvent are mixed to form a chitosan solution. Hydrophobic coating and chitosan solution are applied to the composite yarn.

[0033] During manufacturing, spandex fibers, heating fibers, and bio-based fibers are spirally twisted together to form a composite yarn. The high elasticity of spandex increases the elasticity of the composite yarn, reducing the possibility of irreversible deformation when soaked in water. The heating fibers enhance the heat retention capacity of the composite yarn, providing insulation and increasing its functionality. The bio-based fibers, formed from fermented biological materials, are recyclable, aligning with green environmental policies. A hydrophobic material and chitosan solvent are coated on the outside of the composite yarn. The hydrophobic material reduces contact with water, thus minimizing shrinkage, while the chitosan solvent forms a chitosan film on the yarn, further increasing its hydrophobicity and reducing shrinkage.

[0034] Compared with existing technologies, this method reduces the possibility of the composite yarn coming into contact with water during use by increasing the hydrophobicity of the composite yarn, thereby reducing its shrinkage. Furthermore, the use of spandex increases its elasticity, reducing the possibility of irreversible deformation when deformation occurs. After production, it reduces the need for subsequent mercerizing treatment and simplifies the production process.

[0035] In some embodiments, the hydrophobic coating is expanded polytetrafluoroethylene (ePTFE). ePTFE is used to create multiple spaces in the micro-nano structure inside the composite yarn. ePTFE is a crystalline polymer compound, which makes it resistant to strong acids and alkalis even at high temperatures. In use, the ePTFE coating enables the composite yarn to have good water resistance and corrosion resistance, thus increasing the functionality of the composite yarn.

[0036] In some embodiments, the chitosan solvent is acetic acid, which is used to dissolve chitosan. The concentration of acetic acid is 1%. Chitosan is insoluble in water, and acetic acid is a weak acid that can protonate the amino groups of chitosan, making it soluble. The glycosidic bonds on the sugar chains of chitosan will break under the action of acetic acid. By dissolving it with acetic acid, the possibility of the chitosan solution corroding the composite yarn is reduced after the solution is formed, and the service life of the composite yarn is increased.

[0037] In some embodiments, the heating fiber is made of polyester and ceramic powder. The ceramic powder is used to absorb infrared rays. The ceramic powder is mainly formed by alumina and silicon dioxide and is used to absorb external infrared rays. The ceramic powder is evenly sprinkled on the polyester. When the ceramic powder absorbs external heat energy, it can release far-infrared rays with a wavelength of 4-14 micrometers, which are easily absorbed by the human body. When in use, it can keep warm by external infrared rays, thus improving the heat preservation of the composite yarn.

[0038] In some embodiments, the bio-based fiber is polylactic acid (PLA) fiber. PLA fiber has high crystallinity, which allows it to block external heat. PLA fiber is corn fiber, made from corn starch through fermentation and other steps. The raw materials are relatively environmentally friendly during production. PLA fiber has high crystallinity and high orientation, resulting in high heat resistance and high strength. It does not require special equipment or operating processes and can be spun using conventional processing techniques. Furthermore, PLA fiber is biocompatible, reducing the possibility of allergies to users when the composite yarn is used as clothing fabric.

[0039] In some embodiments, the raw materials for preparing the novel multifunctional composite knitted fabric include, by weight, 12 parts of heat-generating fiber, 17 parts of spandex fiber, 23 parts of bio-based fiber, 11 parts of hydrophobic coating, 10 parts of chitosan, and 12 parts of chitosan solvent. The strength of the composite yarn is increased by twisting the spandex fiber, heat-generating fiber, and bio-based fiber. A chitosan solution is formed by reacting acetic acid with chitosan and then coated onto the composite yarn to form a chitosan film, which protects the composite yarn body. The combination with expanded polytetrafluoroethylene increases the hydrophobicity of the composite yarn after molding and reduces the impact of water flow on the composite yarn.

[0040] like Figure 1 As shown, this application also provides a novel manufacturing process for multifunctional composite knitted fabrics, comprising the following steps:

[0041] S1. Spandex fiber, heat-generating fiber and polylactic acid fiber are spirally twisted according to the weight parts to obtain a composite yarn. Spandex fiber, heat-generating fiber and bio-based fiber are spirally twisted by a twisting machine. Multiple spandex fibers, heat-generating fibers and bio-based fibers are twisted together to form a composite yarn. The heat-generating fiber gives the composite yarn a heat-insulating function. The spandex fiber increases the elasticity of the composite yarn. The polylactic acid fiber makes the raw materials for making the composite yarn environmentally friendly.

[0042] S2. Chitosan and acetic acid are mixed to prepare a chitosan solution, which is then applied to the composite spinning thread and cooled. After the chitosan solution is prepared into a solution, it is then applied to the composite spinning thread. When the chitosan solution cools, a chitosan film is formed on the composite spinning thread, giving it a separation function. This makes the composite spinning thread have good water separation properties, reducing the possibility of the composite spinning thread coming into contact with water, thereby reducing the possibility of the fibers in the composite spinning thread swelling due to contact with water.

[0043] S3. After melting the expanded polytetrafluoroethylene, apply it to the outermost layer of the composite yarn and cool it. The expanded polytetrafluoroethylene has high hydrophobicity and is often used as a coating on the outside of rain jackets. This further reduces the contact between the composite yarn and water flow, thus reducing the possibility of shrinkage when the composite yarn is used.

[0044] S4. Knit the composite yarn using a knitting machine to form a knitted fabric. Then, use a crochet hook or a knitting machine to weave the composite yarn into a fabric for later sale or splicing to form clothing.

[0045] Compared with existing technologies, this method eliminates the need for mercerizing, simplifying the manufacturing process and accelerating the production of the composite yarn.

[0046] In some embodiments, the expanded polytetrafluoroethylene (ePTFE) method includes: using CFC-113 solvent, with an organic peroxide as an initiator, or with an azo initiator or ion radiation initiation, and controlling the average molecular weight of the copolymer by adding a chain transfer agent such as methanol, to form ePTFE. CFC-113 is trichlorotrifluoroethane. By adding large side groups in the organic peroxide, the crystallinity of the polymer is reduced, its crack resistance is reduced, its surface tension is reduced (its surface tension is 18.5 dyn / cm, while the surface tension of water is 72.75 dyn / cm), the possibility of the formed hydrophobic film detaching from the composite yarn is reduced, and the tightness between the hydrophobic film formed by the ePTFE and the composite yarn is increased.

[0047] In some embodiments, the method of using chitosan solution includes: placing 10 parts of chitosan in 12 parts of acetic acid to obtain chitosan solution; applying chitosan solution to composite spinning thread; and then placing the composite spinning thread coated with chitosan solution into an oven at 40 degrees Celsius. Because excessively high temperatures will cause the dried film to become pasty, and excessively low temperatures will increase the film formation time, the cooling temperature of the chitosan film is set at 40 degrees Celsius to facilitate easier forming of the chitosan film. After forming, the composite spinning thread connected to the chitosan film is immersed in sodium hydroxide solution, and then rinsed multiple times with clean water until the chitosan film is neutralized. Finally, it is air-dried naturally to allow the chitosan film to adhere to the composite spinning thread.

[0048] In some embodiments, the method for preparing polylactic acid fiber includes: fermenting corn starch to form lactic acid, then polycondensing and melt spinning it to form polylactic acid fiber. During the reaction of lactic acid, lactide is prepared from lactic acid, then cyclic lactide is prepared, and finally polylactic acid is prepared by ring opening of cyclic lactide. Polylactic acid is then formed by melt spinning technology to facilitate subsequent twisting.

[0049] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0050] The above description is only a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0051] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new multi-functional composite knitted fabric, characterized in that The raw materials include the following parts by weight: 7 to 13 parts of heating fiber, 15 to 28 parts of bio-based fiber, 5 to 13 parts of hydrophobic coating, 12 to 21 parts of spandex fiber, 10 to 13 parts of chitosan, and 10 to 15 parts of chitosan solvent. The spandex fiber, the heating fiber, and the bio-based fiber are twisted together to form a composite yarn. Chitosan and chitosan solvent are mixed to form a chitosan solution. The hydrophobic coating and the chitosan solution are applied to the composite yarn. The application sequence is as follows: first, the chitosan solution is applied to the composite yarn to form a chitosan film, and then the hydrophobic coating is applied to the outermost layer of the composite yarn. The hydrophobic coating is expanded polytetrafluoroethylene (ePTFE), which is used to create multiple spaces in the micro-nano structure inside the composite yarn. The chitosan solvent is acetic acid, which is used to dissolve the chitosan, and the concentration of the acetic acid is 1%. The bio-based fiber is polylactic acid (PLA) fiber, which has high crystallinity to block external heat.

2. A novel multi-functional composite knitted fabric as claimed in claim 1, wherein The heating fiber is made of polyester and ceramic powder, and the ceramic powder is used to absorb infrared rays.

3. A novel multi-functional composite knitted fabric as claimed in claim 1, wherein, The raw materials of the novel multifunctional composite knitted fabric include, by weight, 12 parts of heat-generating fiber, 17 parts of spandex fiber, 23 parts of bio-based fiber, 11 parts of hydrophobic coating, 10 parts of chitosan, and 12 parts of chitosan solvent.

4. A production process for a novel multifunctional composite knitted fabric according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Spandex fiber, heat-generating fiber and polylactic acid fiber are spirally twisted according to the weight parts to obtain composite yarn; S2. Chitosan and acetic acid are mixed to prepare a chitosan solution, and the chitosan solution is coated onto the composite spinning yarn and cooled. S3. After melting expanded polytetrafluoroethylene, apply it to the outermost layer of the composite yarn and let it cool. S4. Knit the composite yarn using a knitting machine to form a knitted fabric.

5. The production process of a novel multifunctional composite knitted fabric according to claim 4, characterized in that, The method for preparing expanded polytetrafluoroethylene includes: using CFC-113 solvent, using organic peroxide as an initiator, or using an azo initiator or ion radiation initiation, and controlling the average molecular weight of the copolymer by adding a chain transfer agent, so as to form expanded polytetrafluoroethylene.

6. The production process of a novel multifunctional composite knitted fabric according to claim 4, characterized in that, The method of using the chitosan solution includes: placing 10 parts of chitosan in 12 parts of acetic acid to obtain a chitosan solution, applying the chitosan solution to the composite spinning thread, and then placing the composite spinning thread coated with the chitosan solution into an oven at 40 degrees Celsius.

7. The production process of a novel multifunctional composite knitted fabric according to claim 4, characterized in that, The method for preparing polylactic acid fiber includes: fermenting corn starch to form lactic acid, and then producing it through polycondensation and melt spinning.

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