Preparation method of double-layer panty-hose with anti-mite and deodorizing composite functions and product thereof

Abstract

The present application relates to the technical field of textile materials, in particular to a preparation method of double-layer pantyhose with anti-mite and deodorization composite functions and a product thereof, mainly comprising: selecting nylon and spandex as raw materials, cooperating the front needle bed and the back needle bed on a double-needle bed warp knitting machine to form a double-layer integrated pantyhose blank with a surface layer and an inner layer, and then obtaining the double-layer pantyhose with anti-mite and deodorization composite functions through steam pre-setting, dyeing and functional finishing, rinsing and drying treatment, product setting and other post-processing technologies, wherein anti-mite and antibacterial microcapsules are synchronously added during dyeing. The present application solves the problems of poor hand feeling, decreased air permeability, short functional duration and the like of the existing functional pantyhose, and obtains pantyhose with both softness and excellent physical properties.

Description

Technical Field

[0001] This invention belongs to the field of weaving technology, specifically relating to a method for preparing double-layer pantyhose with anti-mite and deodorizing composite functions and the product thereof. Background Technology

[0002] Pantyhose are often referred to as "the second skin of the human body." With the continuous development of weaving technology and the constant upgrading of raw materials, while meeting current aesthetic requirements, the functional demands of close-fitting fabrics are also increasing. In the future, low-cost, high-efficiency, and functional new warp-knitted seamless products will become the mainstream demand in the textile market.

[0003] Modern pantyhose have made significant technological advancements. Warp-knitted seamless one-piece molding has replaced traditional stitching, eliminating side seams and greatly improving fit and comfort. At the same time, the fabrics are more diverse, evolving from basic core-spun yarn to functional products incorporating microcapsule technology to meet consumers' growing and more diverse health needs: antibacterial and deodorizing features solve hygiene concerns associated with prolonged wear, while fragrance or moisturizing functions provide a pleasant skincare experience, and protective features such as UV protection or mosquito repellency expand the product's usage scenarios.

[0004] However, the rapid development of pantyhose has also brought challenges. The primary issue is balancing functionality and feel. The microcapsules and adhesives added to achieve functions such as antibacterial, mosquito-repellent, and UV protection often result in a stiff fabric feel and reduced breathability, sacrificing core wearing comfort. Furthermore, insufficient durability is also a pain point; the effectiveness of functional ingredients diminishes significantly after multiple washes, making it difficult to maintain their effects. How to provide powerful functionality while maintaining the soft feel and durability that pantyhose should possess remains a core challenge that the industry needs to overcome.

[0005] Bacteria are the root cause of foul odors. The explanation for the smell is that sweat and urine are originally odorless. However, when they soak into fabrics, bacteria multiply and decompose the urine, protein, and secretions, producing large amounts of ammonia and other irritating gases. The more secretions, the more bacteria multiply, and the more unpleasant the odor. If textiles have the function of killing pathogens, it can prevent bacteria from continuously multiplying on the fabric and producing odors. Summary of the Invention

[0006] In view of the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a method for preparing double-layer pantyhose with anti-mite and deodorizing composite functions and the product thereof, which can solve the problems of poor hand feel, reduced breathability and short-lasting function of functional pantyhose.

[0007] To achieve the objective of this invention, the inventors provide the following technical solution: The present invention provides a method for preparing double-layer pantyhose with anti-mite and deodorizing composite functions, which mainly includes the following steps: (1) Weaving pantyhose blanks Nylon and spandex are selected, with nylon comprising 80-90% and spandex 10-20% by weight. On a double-needle bed warp knitting machine, the front and rear needle beds work together to knit, forming a double-layered, one-piece molded pantyhose blank with an outer and inner layer. The outer layer uses fine denier nylon for abrasion resistance, while the inner layer uses hydrophilic nylon (preferably with an irregular cross-section, such as cross-shaped or Y-shaped) to achieve rapid sweat wicking and moisture-wicking function using the "capillary effect." Proceed to the next step. (2) The finished pantyhose are obtained after finishing processes. The pantyhose blanks undergo further processing including steam pre-forming, dyeing and functional finishing, rinsing and drying, and final shaping to obtain the double-layered pantyhose with anti-mite and deodorizing composite functions; inspection and warehousing follow. in: The steam pre-forming process uses a temperature of 100-130℃ to initially stabilize the fabric with high temperature and steam, eliminate internal stress, prevent curling, and lay the foundation for subsequent processing. In the aforementioned staining and functional finishing (water bath treatment): The dyeing process employs immersion dyeing. The pantyhose are placed in a dyeing machine with a liquor ratio of 1:10-1:15, and the heating rate is controlled between 1.0-1.5℃ / min. 2-3% (owf) (owf = on weight of fabric, referring to the percentage of auxiliary agent dosage relative to fabric weight) of a weakly acidic dye (dye bath pH value 4.5-6.0) is added, and the dyeing treatment is carried out at a temperature of 70-95℃ for 20-35 minutes to impart the final color. This invention utilizes a special high-affinity weakly acidic dye, achieving sufficient diffusion of the dye into the fiber crystalline region within the medium temperature range of 70-95℃. This ensures a high dye uptake while avoiding the thermal damage to the elasticity of spandex caused by traditional 130℃ high-temperature, high-pressure methods. Functional finishing: During the same water bath treatment, add 0.5-1.0% (owf) of acidic leveling agent, 3-6% (owf) of anti-mite and antibacterial microcapsules, and 2-3% (owf) of water-based PU adhesive (crosslinking agent) and other functional additives to give the product anti-mite, antibacterial, and deodorizing functions. After dyeing and functional finishing, clean and rinse thoroughly to remove loose dye and residual chemicals (such as formaldehyde). In the finished product shaping (re-shaping) process, the moistened pantyhose is precisely placed onto a shaping mold that conforms to the shape of the human leg, and then dried and shaped using high temperature (100-130℃) and air pressure (0.10-0.25MPa). The "ironing board" is the most classic image of this step.

[0008] This invention imparts anti-mite and antibacterial functions to pantyhose by adding suitable anti-mite and antibacterial microcapsules during the dyeing process, thereby inhibiting bacterial growth and achieving deodorization. To ensure the longevity of these functions, a crosslinking agent—water-based PU adhesive—is added. Water-based PU adhesive is a heat-activated adhesive based on anionic water-based polyurethane dispersion. The addition of water-based PU adhesive forms a flexible polymer network coating on the fiber surface and around the microcapsules. Through physical anchoring and intermolecular forces, the dye and microcapsules are firmly locked onto the fiber, significantly improving wash resistance. Compared to traditional rigid crosslinking agents, it better balances hand feel, achieving both color fixation and long-lasting anti-mite, antibacterial, and deodorizing functions. Moreover, the appropriate addition of the crosslinking agent does not affect the product's hand feel while achieving these functions. Tests showed that after 50 standard washes, the product's antibacterial rate remained above 98%; its repellency rate against dust mites, leather mites, and demodex mites was above 99%, and after 50 washes, the repellency rate remained above 95%.

[0009] Preferably, in this invention, the nylon is selected from ultra-fine denier semi-dull nylon 66DTY, such as 20D / 34F, 20D / 48F, 30D / 68F, 40D / 34F, etc. (i.e., stretch textured yarn); the spandex is selected from 20D-40D spandex with a draw ratio of 2.5-3.5. The selection of nylon 66DTY filament ensures the strength and smooth feel of the pantyhose, while the spandex provides high elasticity and resilience. Preferably, the pantyhose contains 85-90% nylon and 10-15% spandex by weight percentage.

[0010] Preferably, in this invention, the ultrafine denier semi-dull nylon 66DTY has an irregular cross-section, which can be cross-shaped, Y-shaped, or star-shaped. The irregular cross-section increases the fiber surface area and utilizes the grooves to create a "capillary effect," achieving rapid sweat wicking. Experiments show that using irregularly shaped nylon significantly improves the moisture absorption, wicking, and breathability of fabrics.

[0011] Preferably, in this invention, the raw materials undergo a constant temperature and humidity equilibrium pretreatment: Store the yarn in a temperature- and humidity-controlled warehouse at a temperature of 20±5℃ and a relative humidity of 55%±5%. Spandex yarn should be kept loosely wound to avoid stretching and deformation; nylon yarn should be subjected to constant temperature and humidity balancing treatment 24 hours in advance to eliminate internal stress and prevent uneven tension during subsequent weaving.

[0012] This invention also provides a product obtained by the above preparation method. The product is a double-layer pantyhose with anti-mite and deodorizing composite functions. By weight percentage, the two fibers in the double-layer pantyhose are 80-90% nylon and 10-20% spandex. It is knitted on a double-needle bed warp knitting machine by the cooperation of the front and rear needle beds to form a double-layer integrated pantyhose blank with an outer layer and an inner layer. The outer layer uses fine denier nylon to give it abrasion resistance, and the inner layer uses hydrophilic nylon to give it skin-friendly properties. After dyeing and functional finishing, the double-layer pantyhose is endowed with anti-mite, antibacterial and deodorizing functions.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) The double-layer one-piece molded pantyhose of the present invention uses moisture-wicking and perspiration-wicking semi-dull nylon 66 DTY + high-elastic spandex, and combines microcapsule finishing technology to add anti-mite and antibacterial microcapsules, giving the pantyhose three functions of anti-mite, antibacterial and deodorizing, which can meet the requirements of pantyhose to take into account both softness and skin-friendlyness and excellent physical properties, and greatly improve the added value of the product.

[0014] (2) This invention incorporates water-based PU adhesive, which forms a flexible polymer mesh coating on the fiber surface and around the microcapsules. Through physical anchoring and intermolecular forces (covalent bonds), the microcapsules are firmly locked onto the fibers, thus achieving both a soft feel and washability. The dyes and anti-mite / antibacterial microcapsules of this invention establish strong covalent bonds with the fabric fiber molecules, giving the treated fabric excellent washability, achieving colorfastness, and ensuring the longevity of the anti-mite, antibacterial, and deodorizing functions. Verification shows that after 50 washes, the product does not turn gray or white, maintains a colorfastness of grade 4, and retains an antibacterial rate of over 98% and a repellency rate of over 95%.

[0015] (3) The stretch ratio of spandex in this invention is between 2.5 and 3.5, which provides overall elasticity and resilience, making the pantyhose more stretchable and less prone to wrinkles at the joints when the fabric slides. Detailed Implementation

[0016] The present invention will be described in more detail below with reference to the embodiments. It should be understood that the implementation of the present invention is not limited to the embodiments below, and any modifications and / or alterations made to the present invention will fall within the protection scope of the present invention.

[0017] In this invention, unless otherwise specified, all parts and percentages are by weight, and all equipment and raw materials are commercially available or commonly used in the industry. Unless otherwise specified, the methods used in the embodiments are general techniques in the art.

[0018] Description of main reagents in the examples: Anti-mite and antibacterial microcapsules: TR-MJ anti-mite and antibacterial microcapsules (natural plant essential oil type), Shanghai Hetai Chemical Co., Ltd. Weakly acidic dyes, Neonovon high-fastness MCA series, Zhejiang Longsheng Group Co., Ltd. Acidic leveling agent, model RH-NB-2160, Ningbo Runhe Chemical Industry Co., Ltd. Example 1 A method for preparing double-layer pantyhose with anti-mite and deodorizing composite functions mainly includes the following steps: (1) Weaving pantyhose blanks 20D / 34F semi-dull nylon 66DTY and 30D spandex with a draw ratio of 3.0 are selected and pretreated for 24 hours in advance. The fabricated pantyhose blanks, containing 85% nylon and 15% spandex by weight, are knitted in one piece on a double-needle bed warp knitting machine before proceeding to the next step. (2) The finished pantyhose are obtained after finishing processes. The pantyhose blanks undergo further processing including steam pre-setting (at 110℃), dyeing and functional finishing, rinsing and drying, and final shaping to obtain the double-layered pantyhose with anti-mite and deodorizing composite functions; inspection and warehousing follow. in: In the aforementioned staining and functional finishing (water bath treatment): The pantyhose were placed in a dyeing machine with a liquor ratio of 1:10 and a heating rate of 1.0℃ / min. 2% (owf) of a weakly acidic dye was added, and the pH of the dye bath was approximately 5.5. The dyeing process was carried out at 80℃ for 25 minutes to impart the final color. Functional finishing: During the same water bath treatment, add 0.5% (owf) acidic leveling agent, 4% (owf) anti-mite and antibacterial microcapsules, and 2.8% (owf) water-based PU adhesive. After dyeing and functional finishing, clean thoroughly to remove loose dye and residual chemicals (such as formaldehyde). During the final shaping process: the wet pantyhose is precisely placed onto a shaping mold that conforms to the shape of the human leg, and dried and shaped at a temperature of 120℃ and an air pressure of 0.15Mpa.

[0019] Testing revealed that the double-layered jumpsuit of this invention meets the requirements of GB / T 31713-2015 "Safety and Hygiene Requirements for Antibacterial Textiles," meaning that antibacterial textiles do not harm human health and have no irritating or sensitizing effects on human skin. Other product performance tests are shown in Tables 1-7.

[0020] Example 2 Prepare yarn with a fiber content of 90% nylon and 10% spandex. Other operations are the same as in Example 1, except that: 40D / 34F semi-dull nylon 66DTY and 20D spandex with a draw ratio of 2.5 were selected.

[0021] (2) The finished pantyhose are obtained after finishing processes. The pantyhose blanks undergo further processing including steam pre-setting (at 130℃), dyeing and functional finishing, rinsing and drying, and final shaping to obtain the double-layered pantyhose with anti-mite and deodorizing composite functions; inspection and warehousing follow. in: In the aforementioned staining and functional finishing (water bath treatment): The pantyhose were placed in a dyeing machine with a liquor ratio of 1:15 and a heating rate of 1.5℃ / min. 3% (owf) of a weakly acidic dye was added, and the pH of the dye bath was approximately 4.5. The dyeing process was carried out at 95℃ for 20 minutes to impart the final color. Functional finishing: During the same water bath treatment, add 1% (owf) acidic leveling agent, 6% (owf) anti-mite and antibacterial microcapsules, and 3% (owf) water-based PU adhesive. After dyeing and functional finishing, clean thoroughly to remove loose dye and residual chemicals (such as formaldehyde). During the final shaping process: the wet pantyhose is precisely placed onto a shaping mold that conforms to the shape of the human leg, and dried and shaped at a temperature of 110℃ and an air pressure of 0.2Mpa.

[0022] Testing showed that the double-layer pantyhose product of this embodiment meets the product standard of Embodiment 1, which will not be elaborated further here.

[0023] Example 3 Prepare yarn with a fiber content of 88% nylon and 12% spandex. Other operations are the same as in Example 1, except that: 20D / 48F semi-dull nylon 66DTY and 30D spandex with a draw ratio of 3.5 were selected.

[0024] (2) The finished pantyhose are obtained after finishing processes. The pantyhose blanks undergo further processing including steam pre-setting (at 100℃), dyeing and functional finishing, rinsing and drying, and final shaping to obtain the double-layered pantyhose with anti-mite and deodorizing composite functions; inspection and warehousing follow. in: In the aforementioned staining and functional finishing (water bath treatment): The pantyhose were placed in a dyeing machine with a liquor ratio of 1:10 and a heating rate of 1.5℃ / min. 2.5% (owf) of a weakly acidic dye was added, and the pH of the dye bath was approximately 5.0. The dyeing process was carried out at 70℃ for 35 minutes to impart the final color. Functional finishing: During the same water bath treatment, add 0.8% (owf) of acidic leveling agent, 3% (owf) of anti-mite and antibacterial microcapsules, and 2.5% (owf) of water-based PU adhesive. After dyeing and functional finishing, clean thoroughly to remove loose dye and residual chemicals (such as formaldehyde). During the final shaping process: the wet pantyhose is precisely placed onto a shaping mold that conforms to the shape of the human leg, and dried and shaped at a temperature of 100℃ and an air pressure of 0.25Mpa.

[0025] Testing showed that the double-layer pantyhose product obtained in this embodiment meets the product standard of Embodiment 1, which will not be elaborated further here.

[0026] Example 4 Prepare yarn with a fiber content of 80% nylon and 20% spandex. Other operations are the same as in Example 1, except that: 30D / 68F semi-dull nylon 66DTY and 40D spandex with a draw ratio of 2.6 were selected.

[0027] (2) The finished pantyhose are obtained after finishing processes. The pantyhose blanks undergo further processing including steam pre-setting (at 110℃), dyeing and functional finishing, rinsing and drying, and final shaping to obtain the double-layered pantyhose with anti-mite and deodorizing composite functions; inspection and warehousing follow. in: In the aforementioned staining and functional finishing (water bath treatment): The pantyhose were placed in a dyeing machine with a liquor ratio of 1:15 and a heating rate of 1.0℃ / min. 2.2% (owf) of a weakly acidic dye was added, and the pH of the dye bath was approximately 6.0. The dyeing process was carried out at 75℃ for 30 minutes to impart the final color. Functional finishing: During the same water bath treatment, add 1% (owf) acidic leveling agent, 5% (owf) anti-mite and antibacterial microcapsules, and 3% (owf) water-based PU adhesive. After dyeing and functional finishing, clean thoroughly to remove excess dye and residual chemicals (such as formaldehyde). During the final shaping process: the wet pantyhose is precisely placed onto a shaping mold that conforms to the shape of the human leg, and dried and shaped at a temperature of 110℃ and an air pressure of 0.2Mpa.

[0028] Testing showed that the double-layer pantyhose product obtained in this embodiment meets the product standard of Embodiment 1, which will not be elaborated further here.

[0029] Comparative Example 1 The rest is the same as in Example 1, except that no water-based PU adhesive is added.

[0030] Testing revealed that the finished product provided in this comparative example, after 30 washes, exhibited color fastness, antibacterial rate, and repellency rate all significantly lower than the standard requirements.

[0031] Comparative Example 2 The rest is the same as in Example 1, except that 4% (owf) of water-based PU adhesive is added.

[0032] Through orthogonal experimental optimization, it was found that adding 2.5-3.0% of water-based PU adhesive ensures both durability and hand feel, representing the optimal balance between functional durability and a soft feel. Adding less than this range (e.g., no addition) will lead to rapid loss of functionality; adding more than this range (e.g., 4% (owf)) will result in a stiff feel and whitening after washing.

[0033] The pantyhose obtained in this comparative example felt stiff to the touch and did not have the appropriate softness required for a close-fitting garment; they also turned white after washing.

[0034] Comparative Example 3 Everything else is the same as in Example 1, except that 7% (owf) of anti-mite and antibacterial microcapsules are added. The resulting pantyhose are prone to yellowing and allergic reactions.

[0035] Through orthogonal experimental optimization, it was found that adding 3-6% of anti-mite and antibacterial microcapsules ensures durability without negatively impacting the fabric. Microcapsule finishing can lead to a decrease in fabric hand feel and whiteness; therefore, controlling the dosage is crucial for balancing functionality and comfort. Excessive microcapsule addition prevents the microcapsules from fully forming a stable three-dimensional network structure with the pantyhose fibers. Under washing and friction conditions, the microcapsules cannot maintain a firm bond with the fibers, thus compromising their stability and durability.

[0036] Product performance testing According to relevant standards, the product of Example 1 of this invention was tested for air permeability, moisture permeability, weft tensile strength, bursting strength, color fastness, mite resistance and antibacterial properties. The results are shown in Tables 1-7.

[0037] 1. Breathability test The test was conducted according to GB / T 5453-1997 "Textiles - Determination of Air Permeability of Fabrics". Fabric air permeability refers to the ability of gas molecules to pass through a fabric, and is the most fundamental property of fabric permeability, directly affecting the wearing comfort. Furthermore, the human body has different requirements for fabric air permeability in different environments. This invention is for areas larger than 20 cm². 2 The air permeability of thick and mesh fabric samples was tested and compared with that of ordinary pantyhose (weft knitted) made of the same raw materials. The results are shown in Table 1.

[0038] Table 1. Results of air permeability test Table 1 shows that the average breathability of the thick fabric is 501.9 mm / s, and the average breathability of the mesh fabric is 1691.7 mm / s; the breathability of ordinary pantyhose is 1223.3 mm / s. Therefore, through fabric structure design, warp-knitted seamless pantyhose, commonly used in spring and autumn, can maintain a certain level of windproof and warmth while also possessing fashionable design and breathable comfort.

[0039] 2. Moisture permeability test According to GB / T 12704.1-2009 "Textiles - Test Methods for Moisture Permeability - Part 1: Moisture Absorption Method", the moisture permeability of a fabric refers to the mass of water vapor that passes through a unit area of ​​fabric per unit time under specific temperature and humidity conditions. It has a significant impact on the thermal and humid comfort of clothing. Moisture permeability reflects the fabric's ability to "breathe" moisture; a higher value indicates that the pantyhose can better wick away sweat from the skin, making the skin feel drier. This invention tested the moisture permeability of three 70mm diameter thick fabric samples, three 70mm diameter mesh fabric samples, and a control sample of ordinary pantyhose.

[0040] Table 2 Results of moisture permeability test As shown in Table 2, the average moisture permeability of the thick-structured fabric is 150.9 g / (m²). 2 •d), the average moisture permeability of the mesh structure is 166.3 g / (m²). 2 •d), the average moisture permeability of ordinary pantyhose is 132.4 g / (m 2 •d). A higher moisture permeability indicates better moisture permeability of the fabric, and vice versa. Therefore, warp-knitted seamless pantyhose have better moisture permeability than ordinary pantyhose.

[0041] 3. Weft tensile strength test According to the relevant provisions in FZ / T 73001-2016 "Socks", the tensile properties of fabrics are currently mainly tested using unidirectional (force-bearing) tensile testing, that is, testing the warp (longitudinal) strength, weft (transverse) strength, or the strength at a certain angle to the warp and weft directions of the test sample strip. This invention tests the weft tensile properties of fabrics. The test samples consist of three thick fabric samples, each 12 cm long and 5 cm wide, and three ordinary pantyhose samples, each 12 cm long and 5 cm wide. The test results are shown in Table 3.

[0042] Table 3. Test results of weft tensile properties As shown in Table 3, the breaking strength of the thick fabric (average 184N) is significantly higher than that of ordinary pantyhose (average 123N), by about 50%, indicating that the thick fabric has better latitudinal tensile strength.

[0043] Elongation at break and elongation rate: The average elongation at break of thicker tissue (approximately 218.7 mm) is also better than that of ordinary pantyhose (approximately 188.8 mm), indicating that it has better extensibility when stretched laterally.

[0044] Breaking energy: Thick tissue averages 7.03J, while ordinary pantyhose averages 5.43J. The former requires more energy to break, demonstrating its greater tensile strength.

[0045] Breaking time: The pantyhose of the present invention has a breaking time that is about 10% longer than that of ordinary pantyhose.

[0046] It is evident that, compared to ordinary pantyhose, warp-knitted seamless pantyhose have better tensile strength and elasticity, and are also more comfortable to wear; in addition, the breaking strength test results reflect that seamless warp-knitted pantyhose have higher durability and are more durable than ordinary pantyhose.

[0047] 4. Bursting Performance Test According to GB / T 19976-2005 "Determination of bursting strength of textiles - steel ball method", the test was conducted. During the wearing process, the knees, elbows and other parts of the garment will be subjected to concentrated pressure, and the fabric will bulge, expand or even be damaged. Therefore, this invention tested the bursting strength of the toe part of warp-knitted seamless pantyhose and the toe part of ordinary pantyhose. The experimental results are shown in Table 4.

[0048] Table 4. Results of the toe bursting test for socks Table 4 shows that warp-knitted seamless pantyhose have better bursting resistance and are more durable than ordinary pantyhose. The data indicates that the bursting strength of warp-knitted seamless pantyhose (261N) is higher than that of ordinary pantyhose (220N), by approximately 18.6%. This demonstrates that the weaving process (warp knitting vs. ordinary weft knitting) has a significant impact on the bursting resistance of the fabric; warp-knitted structures are generally more stable and have stronger tear resistance.

[0049] 5. Colorfastness test According to GB 18401-2010, the "National Basic Safety Technical Specifications for Textile Products," pantyhose are products that come into direct contact with the skin and should at least meet Class B requirements. In addition to meeting the mandatory requirements of GB 18401-2010, pantyhose are usually also judged according to their corresponding product standards, such as FZ / T 73001-2016 "Socks." These standards have more comprehensive and specific requirements for colorfastness, generally requiring a level ≥ 3.

[0050] Table 5. Colorfastness Test Results The color fastness test of this invention showed that all levels could be maintained after 50 washes, indicating that the dye, anti-mite and antibacterial microcapsules in this invention form stable covalent bonds with the fiber, resulting in excellent durability.

[0051] 6. Anti-mite efficacy test According to GB / T 24253-2009 "Evaluation of Anti-mite Performance of Textiles", the test method (repellency method) classifies the anti-mite effect by repellency rate: Table 6 Reference Standards for Evaluating Anti-mite Efficacy Testing revealed that the fabric treated with the anti-mite and antibacterial finish of this invention is non-toxic, causes no allergic reactions to the skin, and possesses broad-spectrum and highly effective antibacterial properties. The repellency rate against dust mites, grass mites, and demodex mites is greater than 99%, and the repellency rate remains greater than 95% after 50 washes. Therefore, the double-layer pantyhose of this invention has an extremely strong anti-mite effect.

[0052] 7. Antibacterial performance test Testing was conducted according to FZ / T 73023-2006 "Antibacterial Knitted Fabrics". This is an industry product standard designed to evaluate the quality of antibacterial knitted fabrics. Therefore, it not only specifies antibacterial performance indicators but also includes comprehensive requirements for wash resistance, safety and hygiene indicators (such as formaldehyde content, pH value, and skin irritation), and packaging labeling. FZ / T 73023 "Antibacterial Knitted Fabrics" adds "wash durability" as a test method (oscillation method). This is the most prominent feature of FZ / T 73023 as a product standard; it requires the antibacterial effect to be "durable" and classifies products into three levels: Table 7 Antibacterial Performance Standards The national textile industry standard FZ / T 73023-2006, "Antibacterial Knitted Fabrics," requires that the test standard strains used in the testing include three types: Gram-positive bacteria, Gram-negative bacteria, and fungi, including Staphylococcus aureus, Escherichia coli, and Candida albicans, all of which are common and widely distributed bacteria in daily life. The antibacterial rate is evaluated based on the number of washes the textiles withstand and the types of bacteria tested. Antibacterial textiles are divided into three antibacterial levels: Grade A, Grade AA, and Grade AAA. The higher the grade, the more guaranteed the quality.

[0053] Tests have shown that the double-layer pantyhose of this invention has an antibacterial rate of over 99%, and even after 50 washes, the antibacterial rate remains above 98%, meeting the AAA-level antibacterial performance requirements. It has a significant effect on preventing body odor, foot odor, and itchy skin.

Claims

1. A method for preparing double-layer pantyhose with anti-mite and deodorizing composite functions, characterized in that, The preparation method mainly includes the following steps: (1) Weaving pantyhose blanks Nylon and spandex are selected, with nylon comprising 80-90% and spandex 10-20% by weight. On a double-needle bed warp knitting machine, the front and rear needle beds work together to knit, forming a double-layered, one-piece molded pantyhose blank with an outer and inner layer. This then proceeds to the next step. (2) The finished pantyhose are obtained after finishing processes. The pantyhose blank is then subjected to steam pre-forming, dyeing and functional finishing, rinsing and drying, and final shaping and processing to obtain the double-layer pantyhose with anti-mite and deodorizing composite functions, wherein: The temperature in the steam preheating process is 100-130℃; In the aforementioned staining and functional finishing: Dyeing: Immersion dyeing is used. The pantyhose are placed in the dyeing machine with a liquor ratio of 1:10-1:

15. The heating rate is controlled between 1.0-1.5℃ / min. 2-3% (owf) of weakly acidic dye is added. The pH of the dye bath is 4.5-6.

0. The dyeing process is carried out at a temperature of 70-95℃ for 20-35 minutes. Functional finishing: During the dyeing process, add 0.5-1.0% (owf) of acidic leveling agent, 3-6% (owf) of anti-mite and antibacterial microcapsules and 2.5-3.0% (owf) of water-based PU adhesive. In the finished product setting process: the dyed and functionally finished pantyhose are dried and set on a setting mold at a temperature of 100-130℃ and an air pressure of 0.10-0.25Mpa.

2. The method for preparing a double-layer pantyhose with anti-mite and deodorizing composite functions according to claim 1, characterized in that, The nylon used is ultra-fine denier semi-dull nylon 66DTY; the spandex is 20D-40D spandex with a draw ratio of 2.5-3.

5.

3. The method for preparing a double-layer pantyhose with anti-mite and deodorizing composite functions according to claim 1, characterized in that, The ultra-fine denier nylon 66 DTY has an irregular cross-section, which can be cross-shaped, Y-shaped, or star-shaped.

4. The method for preparing a double-layer pantyhose with anti-mite and deodorizing composite functions according to claim 1, characterized in that, The raw materials nylon and spandex undergo constant temperature and humidity equilibrium pretreatment: the yarn is stored in a temperature and humidity controlled warehouse at a temperature of 20±5℃ and a relative humidity of 55%±5%.

5. The method for preparing a double-layer pantyhose with anti-mite and deodorizing composite functions according to claim 1, characterized in that, The two fibers mentioned above contain 85-90% nylon and 10-15% spandex.

6. A product obtained by the preparation method according to any one of claims 1-5, characterized in that, The product described is a double-layer pantyhose with anti-mite and deodorizing composite functions. By weight percentage, the two fibers in the double-layer pantyhose are 80-90% nylon and 10-20% spandex. It is knitted on a double-needle bed warp knitting machine through the cooperation of the front and rear needle beds to form a double-layer integrated pantyhose blank with an outer layer and an inner layer. The outer layer uses fine denier nylon to give it abrasion resistance, while the inner layer uses hydrophilic nylon to give it skin-friendly properties. After dyeing and functional finishing, the double-layer pantyhose are given anti-mite, antibacterial and deodorizing functions.

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