Antibacterial and antistatic cashmere knitwear and processing technology thereof

Abstract

The application relates to the field of clothes manufacturing, in particular to an antibacterial and antistatic cashmere knitted shirt and a processing technology thereof, which comprises a knitted yarn taking cashmere and wool as an outer net and taking an antibacterial and antistatic fiber as a core thread. The outer net fiber is modified and treated by a functional finishing liquid comprising sodium acrylate-acrylamide copolymer, tea tree essential oil, citric acid and lysine residues to realize deodorization and hydrophilicity, so that the prepared cashmere knitted shirt is not prone to having an odor when sweating and the hydrophilicity is improved, so that the wearing experience is improved.

Description

Technical Field

[0001] This application relates to the field of clothing manufacturing, and in particular to an antibacterial and antistatic cashmere knitwear and its processing technology. Background Technology

[0002] Cashmere is a high-end material that is soft and skin-friendly, warm and lightweight, moisture-wicking and breathable, and has a natural texture, making it suitable for making high-safety-standard intimate apparel. However, as a biological fiber, cashmere is prone to bacterial growth and has insufficient antibacterial properties. In addition, cashmere's antistatic ability is also average in dry environments. Therefore, it is necessary to blend cashmere with antistatic materials to make cashmere knitwear, so that the garment can take into account both the comfort of the skin and the multiple effects of excellent antibacterial properties.

[0003] For example, CN118345550A discloses an ultra-thin, soft, and fluffy cashmere knitted fabric and its preparation method. The first knitting thread is made of cashmere, bamboo fiber with antibacterial effect, and chitosan fiber, which are then modified with antibacterial properties by titanium tetrachloride or magnesium nitrate solution. The first knitting thread or the second knitting thread is treated with antistatic agent XFZ-03. The first knitting thread and the second knitting thread are then manufactured and post-treated to obtain the final antibacterial and antistatic knitted sweater.

[0004] The above-mentioned knitwear has good antibacterial effect, but it is difficult to effectively deal with the odor produced by the decomposition of sweat, such as ammonia and isovaleric acid, which makes it easy for a relatively persistent odor to appear after sweating. On the other hand, the above-mentioned knitwear is mainly made of acrylic fiber, which has weak hydrophilicity and is difficult to absorb sweat in time when sweating, which can easily lead to stuffy and uncomfortable conditions, resulting in a poor wearing experience. Summary of the Invention

[0005] In order to reduce odor when sweating and improve hydrophilicity to enhance the wearing experience, this application provides an antibacterial and antistatic cashmere knitwear and its processing technology.

[0006] Firstly, the antibacterial and antistatic cashmere knitwear provided in this application adopts the following technical solution.

[0007] An antibacterial and antistatic cashmere knitted sweater includes a knitted yarn with cashmere and wool as the outer web and antibacterial and antistatic fibers as the core. The outer web fibers are modified by a functional finishing liquid including sodium acrylate-acrylamide copolymer, tea tree oil, citric acid and lysine residues to achieve deodorization and hydrophilicity.

[0008] Secondly, the antibacterial and antistatic cashmere knitwear processing technology provided in this application adopts the following technical solution.

[0009] A processing technology for manufacturing an antibacterial and antistatic cashmere knitwear sweater includes the following steps.

[0010] S1. Wool and cashmere are mixed, immersed in a functional finishing solution and padded, and then cured and crosslinked to obtain an outer web fiber;

[0011] S2. Perform wool and fiber protection treatment on the outer mesh fibers;

[0012] S3. Conductive modification and antibacterial treatment of polyester filaments to obtain antibacterial and antistatic fibers.

[0013] S4. The outer mesh fiber and antibacterial and antistatic fiber are spun into a core-threaded yarn to obtain knitted yarn;

[0014] S5. Antistatic strengthening treatment of knitted yarn;

[0015] S6. Knit the knitting yarn treated in S5 to obtain the greige fabric.

[0016] S7. Wash, shrink, finish, dry and heat-set the greige fabric to obtain the finished knitwear.

[0017] By adopting the above technical solution, the outer mesh fiber achieves both deodorization and hydrophilicity, while the antibacterial and antistatic fiber, as the core wire, provides antibacterial and antistatic effects, and the outer mesh fiber protects the core wire.

[0018] Optionally, the functional finishing liquid in S1, by mass percentage, specifically includes the following components: 4-6% β-cyclodextrin derivative, 0.5-1% tea tree oil, 1.5-2% ε-polylysine, 1-2% citric acid, 8-10% sodium acrylate-acrylamide copolymer, 3% sodium hypophosphite, and the remainder is a mixed solution of formic acid and deionized water with pH adjusted to 4.5-5.

[0019] By adopting the above technical solutions, tea tree oil can neutralize isovaleric acid, β-cyclodextrin derivatives encapsulate tea tree oil for slow release, and β-cyclodextrin derivatives can also serve as cross-linking anchors, achieving multiple uses with one agent to reduce costs; citric acid neutralizes ammonia; ε-polylysine can decompose bacterial metabolites, playing a role in deodorization at the source; sodium acrylate-acrylamide copolymer is grafted onto the fiber surface to form a permanent hydration layer to maintain long-lasting hydrophilicity; sodium hypophosphite can catalyze the covalent bonding of functional groups with wool fibers, retaining a good deodorizing effect after multiple washes and improving durability.

[0020] Optionally, in S1, the curing crosslinking is first pre-baked at 78-82°C for 10 minutes, and then baked at 160-170°C for 3-4 minutes.

[0021] By adopting the above technical solution, low-temperature pre-drying is used to remove excess moisture from the functional finishing liquid, which can also reduce the possibility of uneven penetration and adhesion of functional agents inside the fiber due to rapid migration of functional agents at high temperatures.

[0022] Optionally, in step S3, the conductive modification first involves etching the polyester filament with NaOH solution, and then using a mixture of EDOT monomer, PSS and FeCl3 oxidant to perform conductive modification on the polyester filament.

[0023] By adopting the above technical solution, NaOH etching is first used to form micro-pits on the surface of polyester filaments and introduce carboxyl groups to enhance the physical anchor points and chemical bonding sites for the subsequent conductive layer, so that the antistatic ability does not decrease too much after multiple washings. EDOT is a conductive monomer, PSS is a dispersant and stabilizer, and FeCl3 is an oxidant, so that EDOT forms a uniform and continuous PEDOT:PSS conductive layer on the surface of polyester filaments, effectively reducing surface resistance and improving antistatic ability.

[0024] Optionally, in the antibacterial treatment process of S3, the conductive modified polyester filament is immersed in a chitosan quaternary ammonium salt solution.

[0025] By adopting the above technical solution, it is ensured that the core yarn can still play a certain antibacterial role after the outer mesh fiber is worn. Chitosan quaternary ammonium salt can electrostatically combine with the anionic PEDOT:PSS conductive layer under neutral conditions without the need for acidic solvents, thus reducing damage to polyester filaments. Furthermore, chitosan quaternary ammonium salt can form ion pairs with the PEDOT:PSS conductive layer, which helps to improve the conductivity stability of the fiber surface, making the resistance of the knitted fiber more uniform.

[0026] Optionally, S5 specifically includes the following steps:

[0027] S51. Plasma activation of knitted yarns to introduce hydroxyl and carboxyl groups;

[0028] S52. A coating liquid comprising PEDOT:PSS, waterborne polyurethane adhesive, aziridine crosslinking agent and leveling agent is prepared.

[0029] S53. Spray the coating liquid onto the rotating knitted yarn, then dry and cure it.

[0030] By adopting the above technical solution, the hydroxyl groups introduced by plasma treatment enable the PEDOT:PSS conductive layer to form a bridging structure in the tiny gaps within the fiber, improving the overall conductivity uniformity of the yarn; polyurethane bonding, aziridine crosslinking and crosslinking curing form a three-dimensional network, which firmly locks the PEDOT:PSS conductive layer and makes it more resistant to washing.

[0031] Optionally, in the finishing process of S7, the fabric is first immersed in a finishing solution including cationic polyurethane and a softener, soaked for 5 minutes, and then dehydrated.

[0032] By adopting the above technical solution, the amino groups in cationic polyurethane can form ionic bonds with the carboxyl groups, sodium acrylate-acrylamide copolymers, and PEDOT:PSS carboxyl / sulfonic acid groups on the fiber surface, thereby locking the antibacterial, antistatic, and hydrophilic functional layers onto the fiber surface and reducing loss during the washing process.

[0033] In summary, this application includes at least the following beneficial effects:

[0034] The outer mesh fiber serves both deodorizing and hydrophilic purposes, while the antibacterial and antistatic fiber, as the core thread, provides antibacterial and antistatic effects, effectively addressing sweat odor and enhancing the wearing experience. Attached Figure Description

[0035] Figure 1 This is a flowchart of a processing technology for antibacterial and antistatic cashmere knitwear. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] This application discloses an antibacterial and antistatic cashmere knitted sweater, comprising a knitted yarn with cashmere and wool as the outer web and antibacterial and antistatic fibers as the core, wherein cashmere accounts for 5-8% of the outer web fibers. The outer web fibers are modified by a functional finishing liquid including sodium acrylate-acrylamide copolymer, tea tree oil, citric acid and lysine residues to achieve deodorization and hydrophilicity.

[0038] This application also discloses a processing technology for antibacterial and antistatic cashmere knitwear, referring to... Figure 1 Specifically, it includes the following steps.

[0039] S1. Wool and cashmere are mixed, immersed in a functional finishing solution and padded, and then cured and crosslinked to obtain an outer web fiber.

[0040] The functional finishing solution, by mass percentage, comprises: 4-6% β-cyclodextrin derivative, 0.5-1% tea tree oil, 1.5-2% ε-polylysine, 1-2% citric acid, 8-10% sodium acrylate-acrylamide copolymer, 3% sodium hypophosphite, and the remainder is a mixture of formic acid and deionized water with pH adjusted to 4.5-5. The functional finishing solution is prepared by stirring at a constant temperature of 50°C.

[0041] After immersing the mixed wool and cashmere in the functional finishing solution, gently stir for 20 minutes to ensure sufficient penetration. Then, use a two-dip and two-nip process, with the nip rate controlled at 70-80%, to ensure that the functional finishing solution is evenly distributed within the fiber.

[0042] The curing and crosslinking process begins with a pre-baking at 78-82℃ for 10 minutes to prevent migration of the functional finishing solution. Then, a baking process is performed at 160-170℃ for 3-4 minutes. This allows the β-cyclodextrin derivatives, ε-polylysine, and sodium acrylate-acrylamide copolymer in the functional finishing solution to form covalent bonds with the amino and carboxyl groups on the surface of wool fibers under the catalysis of sodium hypophosphite, thereby improving the retention rate of functional agents after multiple washes.

[0043] S2. Perform wool and fiber protection treatment on the outer mesh fibers.

[0044] The functionalized outer web fibers are treated with low-intensity opening equipment to reduce the risk of surface functional layer detachment due to severe impact. Then, a blending oil is prepared by mixing nonionic blending oil, alkyl phosphate antistatic agent, and water in a ratio of 0.5:0.2:10, and sprayed evenly onto the outer web fibers. The treated fibers are then sealed and left to stand for 12 hours to allow the oil-water system to penetrate evenly, controlling the fiber moisture regain to 18-20%, ensuring the integrity of the functional layer on the outer web fiber surface and achieving the required spinnability.

[0045] S3. Conductive modification and antibacterial treatment of polyester filaments to obtain antibacterial and antistatic fibers.

[0046] For conductivity modification, polyester filaments were first etched at 60°C for 15 min using a 5% NaOH solution. Then, a mixture of 0.3 mol / L EDOT monomer, 0.45 mol / L PSS, and 0.9 mol / L FeCl3 oxidant was prepared. Using the mixture, a 50-80 nm PEDOT:PSS conductive layer was formed on the surface of the polyester filaments by immersion-pulling at a speed of 5 mm / s for 30 s. The polyester filaments were then rinsed three times with deionized water and finally vacuum dried at 60°C for 2 h to complete the conductivity modification of the polyester filaments.

[0047] During the antibacterial treatment, the conductive-modified polyester filaments are immersed in a 1% chitosan quaternary ammonium salt solution for 10 minutes and then dried to complete the antibacterial treatment. Furthermore, the chitosan quaternary ammonium salt targets Gram-negative bacteria, while tea polyphenols target Gram-positive bacteria, thus forming a broad-spectrum antibacterial complement with the outer mesh fibers.

[0048] Before the antibacterial and antistatic fibers are wound into a tube, a special conductive fiber oil containing hydrophilic components is applied at 1% of the fiber weight to enhance antistatic properties, improve hydrophilicity, and provide lubrication and protection for the fiber surface.

[0049] S4. The outer mesh fiber and antibacterial and antistatic fiber are spun into a core-threaded yarn to obtain a knitted yarn.

[0050] S5. Perform antistatic strengthening treatment on the knitted yarn. This includes the following steps.

[0051] S51. Plasma activation of knitted yarns is performed at a power of 200W, a gas flow rate of 20L / min, and a processing speed of 5m / min to introduce hydroxyl and carboxyl groups.

[0052] S52. Prepare a coating solution by mixing PEDOT:PSS, waterborne polyurethane adhesive, aziridine crosslinking agent and leveling agent in a ratio of 80:15:3:2.

[0053] S53. Spray the coating liquid onto the rotating knitting yarn, control the liquid content to 25-30%, then dry at 80℃ for 10 minutes, and then perform UV crosslinking curing.

[0054] S6. Knit the yarn treated in S5 to obtain greige fabric.

[0055] S7. Wash, shrink, finish, dry and heat-set the greige fabric to obtain the finished knitwear.

[0056] The washing and shrinking process uses a neutral detergent with a pH of 6.5-7, a liquor ratio of 1:15, and is treated at 38-42℃ for 6-8 minutes with a drum speed of 20 r / min to remove spinning oil and slightly shrink the yarn.

[0057] The finishing process begins by immersing the washed and shrunk fabric in a finishing solution containing 2% cationic polyurethane and 0.5% trace softener for 5 minutes, and then dehydrating it to a moisture content of 40%.

[0058] During drying, control the maximum temperature at 60℃ in the rotary dryer and dry for 25-30 minutes.

[0059] For dimensional stability, 100℃ saturated steam can be used for low-temperature shaping for 30 seconds to reduce the damage of dry heat to the conductive layer.

[0060] The following examples and comparative models are presented with the main conditions changing.

[0061] Example 1:

[0062] A processing technology for antibacterial and antistatic cashmere knitwear includes the following steps.

[0063] S1. Wool and cashmere are mixed, immersed in a functional finishing solution and padded, and then cured and crosslinked to obtain an outer web fiber.

[0064] The functional finishing solution, by mass percentage, comprises: 4% β-cyclodextrin derivative, 0.5% tea tree oil, 1.5% ε-polylysine, 1% citric acid, 8% sodium acrylate-acrylamide copolymer, 3% sodium hypophosphite, and the remainder is a mixture of formic acid and deionized water with pH adjusted to 4.5-5. The functional finishing solution is prepared under constant temperature stirring at 50℃.

[0065] The curing and crosslinking process involves pre-baking at 78°C for 10 minutes, followed by baking at 160°C for 3 minutes.

[0066] S2. Perform wool and fiber protection treatment on the outer mesh fibers.

[0067] S3. Conductive modification and antibacterial treatment of polyester filaments to obtain antibacterial and antistatic fibers.

[0068] For conductivity modification, polyester filaments were first etched at 60°C for 15 min using a 5% NaOH solution. Then, a mixture of 0.3 mol / L EDOT monomer, 0.45 mol / L PSS, and 0.9 mol / L FeCl3 oxidant was prepared. Using the mixture, a 50 nm PEDOT:PSS conductive layer was formed on the surface of the polyester filaments by immersion-pulling at a speed of 5 mm / s for 30 s. The polyester filaments were then rinsed three times with deionized water and finally vacuum dried at 60°C for 2 h to complete the conductivity modification of the polyester filaments.

[0069] During the antibacterial treatment, the conductive modified polyester filaments are immersed in a 1% concentration of chitosan quaternary ammonium salt solution, soaked for 10 minutes, and then dried to complete the antibacterial treatment.

[0070] S4. The outer mesh fiber and antibacterial and antistatic fiber are spun into a core-threaded yarn to obtain a knitted yarn.

[0071] S5. Perform antistatic strengthening treatment on the knitted yarn. This includes the following steps.

[0072] S51. Plasma activation of knitted yarns is performed at a power of 200W, a gas flow rate of 20L / min, and a processing speed of 5m / min to introduce hydroxyl and carboxyl groups.

[0073] S52. Prepare a coating solution by mixing PEDOT:PSS, waterborne polyurethane adhesive, aziridine crosslinking agent and leveling agent in a ratio of 80:15:3:2.

[0074] S53. Spray the coating liquid onto the rotating knitting yarn, control the liquid content to 30%, then dry at 80°C for 10 minutes, and then perform UV crosslinking curing.

[0075] S6. Knit the yarn treated in S5 to obtain greige fabric.

[0076] S7. Wash, shrink, finish, dry and heat-set the greige fabric to obtain the finished knitwear.

[0077] Example 2:

[0078] The difference from Example 1 is that:

[0079] The functional finishing solution, by mass percentage, comprises: 6% β-cyclodextrin derivative, 1% tea tree oil, 2% ε-polylysine, 2% citric acid, 10% sodium acrylate-acrylamide copolymer, 3% sodium hypophosphite, and the remainder is a mixture of formic acid and deionized water with pH adjusted to 4.5-5. The functional finishing solution is prepared under constant temperature stirring at 50℃.

[0080] The curing and crosslinking process involves pre-baking at 82°C for 10 minutes, followed by baking at 170°C for 4 minutes.

[0081] Comparative Example 1:

[0082] The difference from Example 1 is that the outer mesh fibers were not modified using a functional finishing liquid.

[0083] Comparative Example 2:

[0084] The difference from Example 1 is that the curing crosslinking in S1 was not pre-baked.

[0085] Comparative Example 3:

[0086] The difference from Example 1 is that the conductive modification in S3 did not use NaOH solution etching.

[0087] Comparative Example 4:

[0088] The difference from Example 1 is that S5 does not involve plasma activation of the knitted yarn.

[0089] The following parameters were tested on the two embodiments and four comparative examples.

[0090] For deodorization performance, the ammonia removal rate was determined according to standard GB / T 33610.1-2017 "Determination of deodorization performance of textiles - Part 1: Ammonia". For isovaleric acid removal rate, the method of standard GB / T 33610.3-2017 was used to simulate the organic acids of sweat odor.

[0091] Hydrophilic properties were determined by referring to standard GB / T 9994-2013 "Standard Moisture Regain of Textile Materials" for moisture regain and by referring to standard ISO 19403-6:2017 for contact angle determination using the static drop method.

[0092] Antibacterial properties were determined by referring to the standard JIS L 1902:2015 "Test Method for Antibacterial Properties of Textiles" to determine the antibacterial rate against Staphylococcus aureus and Escherichia coli.

[0093] For antistatic properties, the surface resistance was determined in accordance with standard GB / T 12703.1-2021 "Evaluation of electrostatic properties of textiles - Part 1: Static voltage half-life and surface resistivity", and the electrostatic voltage half-life was determined in accordance with standard GB / T 14446-2014 "Electrostatic properties of textiles - Part 2: Surface charge density".

[0094] Furthermore, all four performance indicators were tested and compared before and after the knitwear was washed. For each example and comparative example, samples of the same size were cut from three different parts of the knitwear: the front piece, the back piece, and the sleeves. The knitwear was washed according to Method 5A in standard GB / T 8629-2017 "Testing Procedures for Home Washing and Drying of Textiles", simulating actual wearing and washing.

[0095] The deodorization performance test results are shown in Table 1 below, the hydrophilicity performance test results are shown in Table 2 below, the antibacterial performance test results are shown in Table 3 below, and the antistatic performance test results are shown in Table 4 below.

[0096] Table 1:

[0097]

[0098] Table 2:

[0099]

[0100] Table 3:

[0101]

[0102] Table 4:

[0103]

[0104] As can be seen from the four tables above, the knitwear of both Example 1 and Example 2 exhibits excellent deodorizing, hydrophilic, antibacterial, and antistatic properties before and after washing. Among them, Example 2 has a higher concentration of functional finishing liquid and better curing process parameters, so its various properties are slightly better than those of Example 1. Moreover, the functional retention rate after washing is relatively high, which meets the needs of long-term wear.

[0105] Comparative Example 1 shows that all functions are inherent properties of the outer mesh fiber itself, with poor deodorization, hydrophilicity, antibacterial and antistatic effects.

[0106] Comparative Example 2 did not undergo pre-baking during S1 curing and crosslinking. The functional agent migration led to uneven distribution, and a large amount of it fell off after washing, resulting in a significant decrease in the functional retention rate. This verifies the key role of the pre-baking step in functional stability.

[0107] In Comparative Example 3, the surface of the polyester filament was smooth after etching with NaOH without the conductive modification in S3. The PEDOT:PSS conductive layer had poor adhesion and peeled off after washing, resulting in a sharp drop in antistatic properties.

[0108] Comparative Example 4, which was not activated by plasma in S5, lacked active groups on the yarn surface, had weak adhesion to the coating liquid, and experienced the removal of the conductive layer after washing, resulting in a significant decrease in antistatic properties. This demonstrates the importance of plasma activation for functional enhancement.

[0109] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An antibacterial and antistatic cashmere knitwear, characterized in that: This includes knitted yarns with cashmere and wool as the outer mesh and antibacterial and antistatic fibers as the core. The outer mesh fibers are modified by a functional finishing liquid containing sodium acrylate-acrylamide copolymer, tea tree oil, citric acid and lysine residues to achieve deodorization and hydrophilicity.

2. A processing method for an antibacterial and antistatic cashmere knitwear, used to manufacture the antibacterial and antistatic cashmere knitwear as described in claim 1, characterized in that: Specifically, the steps include the following: S1. Wool and cashmere are mixed, immersed in a functional finishing solution and padded, and then cured and crosslinked to obtain an outer web fiber; S2. Perform wool and fiber protection treatment on the outer mesh fibers; S3. Conductive modification and antibacterial treatment of polyester filaments to obtain antibacterial and antistatic fibers. S4. The outer mesh fiber and antibacterial and antistatic fiber are spun into a core-threaded yarn to obtain knitted yarn; S5. Antistatic strengthening treatment of knitted yarn; S6. Knit the knitting yarn treated in S5 to obtain the greige fabric. S7. Wash, shrink, finish, dry and heat-set the greige fabric to obtain the finished knitwear.

3. The antibacterial and antistatic cashmere knitwear processing technology according to claim 2, characterized in that: The functional finishing liquid in S1, by mass percentage, specifically includes the following components: 4-6% β-cyclodextrin derivative, 0.5-1% tea tree oil, 1.5-2% ε-polylysine, 1-2% citric acid, 8-10% sodium acrylate-acrylamide copolymer, 3% sodium hypophosphite, and the remainder is a mixed solution of formic acid and deionized water with pH adjusted to 4.5-5.

4. The antibacterial and antistatic cashmere knitwear processing technology according to claim 2, characterized in that: In S1, the curing and crosslinking process is first pre-baked at 78-82℃ for 10 minutes, and then baked at 160-170℃ for 3-4 minutes.

5. The processing technology for an antibacterial and antistatic cashmere knitwear according to claim 2, characterized in that: In the S3 process, the conductive modification is first performed by etching the polyester filament with NaOH solution, and then by using a mixture of EDOT monomer, PSS and FeCl3 oxidant to modify the conductivity of the polyester filament.

6. The processing technology for an antibacterial and antistatic cashmere knitwear according to claim 2, characterized in that: In the antibacterial treatment process described in S3, the conductive modified polyester filaments are immersed in a chitosan quaternary ammonium salt solution.

7. The processing technology for an antibacterial and antistatic cashmere knitwear according to claim 2, characterized in that: S5 specifically includes the following steps: S51. Plasma activation of knitted yarns to introduce hydroxyl and carboxyl groups; S52. A coating liquid comprising PEDOT:PSS, waterborne polyurethane adhesive, aziridine crosslinking agent and leveling agent is prepared. S53. Spray the coating liquid onto the rotating knitted yarn, then dry and cure it.

8. The processing technology for an antibacterial and antistatic cashmere knitwear according to claim 2, characterized in that: In the finishing process described in S7, the fabric is first immersed in a finishing solution containing cationic polyurethane and a softener, soaked for 5 minutes, and then dehydrated.

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