Disposable underpants with antibacterial function and preparation method thereof

Abstract

This invention belongs to the field of disposable hygiene products technology, specifically disclosing a disposable underwear with antibacterial function and its preparation method. The invention involves constructing a three-layer structure: a moisture-wicking layer, a moisture-wicking-absorbent layer, and an antibacterial-moisture-wicking layer. Different properties are imparted to different structures. The moisture-wicking layer and the moisture-wicking-absorbent layer constitute the inner lining layer, mainly achieved by modifying cotton fibers and coating one side of the modified cotton fibers to enhance moisture wicking performance and create a dry microenvironment, thus preventing bacterial growth at the source and achieving an antibacterial effect. The antibacterial-moisture-wicking layer constitutes the pant body layer. By introducing sodium alginate (SA) and ε-polylysine, sodium alginate (SA) not only acts as a "binder" but also cross-links with ε-polylysine to form a stable three-dimensional network structure, "fixing" the antibacterial factors within its structure to achieve the antibacterial purpose. This invention effectively solves the problems of poor antibacterial effect and insufficient moisture wicking in traditional disposable underwear.

Description

Technical Field

[0001] This invention belongs to the field of disposable products technology, and relates to a disposable underwear with antibacterial function and its preparation method. Background Technology

[0002] Disposable underwear is widely used in daily life due to its convenience. The choice of disposable underwear is often based solely on its softness and skin-friendliness, with most opting for pure cotton. However, the single-function nature of pure cotton underwear no longer meets market demands. Consumers are focusing on its antibacterial properties, and the market is placing higher demands on its antibacterial, comfort, and durability. Existing products are mostly made of pure cotton, which, while skin-friendly and breathable, suffers from poor moisture wicking, weak quick-drying, and insufficient antibacterial effect. Some technologies use antimicrobial peptides for antibacterial purposes, but the high cost of raw materials makes them unsuitable for disposable products. Chemical antibacterial agents, while having good antibacterial effects, are highly irritating and unsuitable for sensitive skin. Natural antibacterial fabrics containing flavonoids offer excellent antibacterial and moisture-wicking properties, but their texture is stiff, they contain a large amount of linen, and their skin-friendliness is poor. Furthermore, ordinary non-woven antibacterial products suffer from problems such as stiff material, easy shedding of antibacterial agents, and poor sweat and abrasion resistance.

[0003] Existing one-way moisture-wicking technologies mostly employ a structure where a hydrophobic film is coated on the outside and the inside remains hydrophilic. While this achieves directional moisture wicking, excessive hydrophobicity on the outside reduces overall moisture absorption capacity, and a thick film layer affects softness and breathability. Furthermore, the lack of an amphiphilic gradient structure results in poor synergy between moisture wicking and antibacterial properties. CN109629264A discloses a one-way moisture-wicking cotton fabric that achieves unidirectional moisture wicking by coating the outer side of the cotton fabric with nano-SiO2 and a fluorinated water-repellent agent to form a hydrophobic film, while retaining the natural hydrophilic structure on the inner side. However, this still suffers from drawbacks such as decreased moisture absorption, insufficient softness, and inadequate breathability. Therefore, developing a disposable underwear with antibacterial function and its preparation method has become an urgent technical problem to be solved in the field of disposable products.

[0004] To address the aforementioned problems, this invention proposes a disposable underwear with antibacterial function and its preparation method. The dual-layer system, primarily using physical antibacterial agents and secondarily using chemical antibacterial agents, achieves long-lasting antibacterial effects, high moisture absorption, rapid moisture wicking, softness, durability, and low sensitivity due to its weak acidity. Summary of the Invention

[0005] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to provide a disposable underwear with antibacterial function and its preparation method, so as to solve the problems of poor antibacterial effect, insufficient moisture wicking and easy shedding of antibacterial factors in traditional disposable underwear.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A disposable pair of underwear with antibacterial function includes an inner crotch layer and a body layer. The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the body layer is an antibacterial-absorbent layer. By weight, The moisture-wicking layer comprises 100 parts modified cotton fiber and 2-6 parts natural plant wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 1-3 parts natural plant wax and 0.5-1 parts sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 1-3 parts sodium alginate (SA), 0.1-0.5 parts ε-polylysine, 3-5 parts plant antibacterial agent and 2-5 parts natural organic acid; The modified cotton fiber includes cotton fiber and chitosan microspheres; the nano-chitosan microspheres include chitosan and sodium tripolyphosphate, and the mass ratio of chitosan to sodium tripolyphosphate is (1~5):(0.5~2).

[0007] Preferably, the natural plant wax is one of candelilla wax, hemp wax, and rice bran wax, or a mixture of several in any proportion.

[0008] Preferably, the plant antibacterial agent is any one of licorice extract, sophora flavescens extract, chamomile extract, scutellaria baicalensis extract, grapefruit seed extract, and artemisia argyi extract, or a mixture of multiple extracts in any proportion.

[0009] Preferably, the natural organic acid is lactic acid or citric acid.

[0010] A method for preparing disposable underwear with antibacterial function as described in any of the preceding claims, characterized by comprising the following steps: S1. Cotton fiber pretreatment: Place cotton fibers in a 40~50℃ water bath and stir for 10~20 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the cotton fiber after gas explosion is soaked in chitosan microsphere solution. After impregnation and drying, modified cotton fiber is obtained. S3. Preparation of the moisture-wicking layer: Disperse natural plant wax and Tween 80 in an ethanol solution at a mass ratio of 1:(0.1~0.3), stir at 50~70℃ until completely dissolved to obtain a natural plant wax ethanol solution, spray the natural plant wax ethanol solution onto one side of the cotton fiber loaded with modified chitosan, and then dry it to obtain the moisture-wicking layer. S4. Moisture-wicking and absorbent layer: Repeat step S3, the amount of natural plant wax added is 25-50% of the amount of natural plant wax in step S3, immerse the obtained moisture-wicking layer in sodium alginate (SA) solution, and obtain the moisture-wicking and absorbent layer by padding and drying; the padding rate of the moisture-wicking and absorbent layer is 60-80%; S5. Preparation of antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to sodium alginate (SA), after padding and drying, and then sprayed with plant antibacterial agent to obtain antibacterial-absorbent layer; S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. After sterilization, disposable antibacterial underwear is obtained.

[0011] Preferably, the specific preparation method of the modified cotton fiber in step S2 is as follows: S201. Dissolve chitosan in a 25-50% acetic acid solution and stir at 40-50°C for 10-20 minutes to obtain a chitosan solution with a mass fraction of 1-5%. S202. Add 0.5-2% sodium tripolyphosphate by mass to the above chitosan solution to obtain a chitosan microsphere solution; S203. Place pure cotton fibers in high-pressure saturated steam at 180~200℃, 1.0~1.5MPa, for 1~2 minutes. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained.

[0012] Preferably, the specific preparation method of the antibacterial-absorbent layer in step S5 is as follows: S501. The spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, subjected to a first impregnation and dried to obtain pretreated nonwoven fabric A; the pick-up rate of the pretreated nonwoven fabric A is 70~90%; S502. The pretreated nonwoven fabric A is immersed in an ε-polylysine solution and then subjected to a second padding and drying to obtain pretreated nonwoven fabric B; the padding rate of the pretreated nonwoven fabric B is 60~80%; S503. Disperse flavonoid-containing plant extracts evenly in pure water, and then adjust the pH of the solution to 5-6 with natural organic acids to obtain plant antibacterial agents; S504. The above-mentioned plant antibacterial agent is ultrasonically impregnated onto the pretreated nonwoven fabric B, and then dried with hot air at 60~80℃ to obtain an antibacterial-absorbent layer, wherein the mass fraction of the plant antibacterial agent is 3~5%.

[0013] Preferably, the first impregnation and drying in step S501 specifically involves: first impregnating at a temperature of 30~45℃ for 20~30 minutes with a pressure of 0.2~0.3MPa, and then semi-drying at 60~80℃ to obtain a pretreated nonwoven fabric A with a moisture content of 15~25%. The second impregnation and drying in step S502 specifically involves immersing the pretreated nonwoven fabric A in an ε-polylysine aqueous solution at room temperature for 10-20 minutes under a pressure of 0.15-0.2 MPa, followed by complete drying at 90-105°C.

[0014] Preferably, the sodium alginate (SA) solution in step S501 has a mass fraction of 1-3%, and the ε-polylysine in step S502 has a mass fraction of 0.1-0.5%.

[0015] Preferably, the sterilization method in step S6 is either EO sterilization or electron beam sterilization.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention achieves efficient and long-lasting antibacterial protection for the entire area of ​​disposable underwear by constructing a dual protection system that combines the structural physical antibacterial properties of the inner crotch layer with the bioactive antibacterial properties of the pant body layer. The inner crotch layer (including a moisture-wicking layer and a moisture-wicking-absorbent layer) enhances moisture wicking to create a dry microenvironment for the private parts, depriving pathogenic microorganisms of the moisture conditions required for reproduction from the source, thus exerting physical antibacterial efficacy; the pant body layer (antibacterial-absorbent layer) actively sterilizes with natural active factors. The three-layer structure is progressive and interlocking, comprehensively constructing a safe and non-irritating private health barrier.

[0017] (2) In a dry state, the antibacterial active factors (plant antibacterial agents and ε-polylysine) are "adsorbed" in the gel network constructed by sodium alginate (SA) through electrostatic interaction. When in contact with liquids such as sweat and menstrual blood, due to the increase in water permeation and salt concentration in the system, the electrostatic shielding effect induces the expansion of network pore size and ion exchange, which promotes the slow release of ε-polylysine and plant antibacterial agents, thus achieving broad-spectrum antibacterial activity.

[0018] (3) This invention achieves a breakthrough in raw materials that are all-natural and have zero chemical additives. It uses 100% biodegradable materials such as cotton fiber, naturally derived chitosan and sodium alginate (SA), natural plant wax and ε-polylysine, completely eliminating chemical cross-linking agents and synthetic antibacterial agents in traditional processes. This invention has no chemical residues, is gentle on the skin, safe and non-irritating, providing the purest care for sensitive skin, and achieving an organic unity of green ecology and safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic flowchart illustrating a method for preparing disposable underwear with antibacterial function, as provided in an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0022] To achieve the above-mentioned objectives of the present invention, the technical solution of the present invention will be further described in detail below, but the scope of protection of the present invention is not limited to the following description.

[0023] A disposable pair of underwear with antibacterial function includes an inner crotch layer and a body layer. The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the body layer is an antibacterial-absorbent layer. By weight, The moisture-wicking layer comprises 100 parts modified cotton fiber and 2-6 parts natural plant wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 1-3 parts natural plant wax, and 0.5-1 parts sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 1-3 parts sodium alginate (SA), 0.1-0.5 parts ε-polylysine, 3-5 parts plant antibacterial agent, and 2-5 parts natural organic acid; The addition of natural plant wax to the moisture-wicking layer is due to its high safety profile, derived from natural plants or animals. It forms a soft, thin film that can create a hydrophobic, moisture-wicking layer on the fiber surface, achieving dryness and breathability while reducing bacterial adhesion. When sweat or menstrual blood comes into contact with the skin, the liquid cannot remain on the wax surface and is instantly absorbed by the moisture-wicking-absorbent layer in the middle layer along the fiber gaps. In some embodiments, the natural plant wax is candelilla wax, while in others it is hemp wax or rice bran wax. Sodium alginate (SA) is added to the moisture-wicking and absorbent layer because it has the function of absorbing moisture and transforming it into a gel. It can also be combined with natural plant wax to create a dual-function structure that wicks away moisture and absorbs water. It also acts as a pure natural bio-glue, firmly anchoring the loose cotton fibers and microspheres together, enhancing the structural strength of the absorbent layer in a wet state, and preventing the underwear from breaking, clumping, or shedding lint after absorbing water.

[0024] The addition of ε-polylysine to the antibacterial-moisture-wicking layer is due to its positive charge (amino group) and the large amount of negative charge (carboxyl group) of sodium alginate. In a dry state, the two form a polyelectrolyte complex network through electrostatic interaction, firmly fixing the plant antibacterial agent within it. When in contact with sweat or menstrual blood, the sodium alginate (SA) network absorbs water and swells, increasing its pore size and slowly and evenly releasing the antibacterial factor.

[0025] The modified cotton fiber comprises cotton fiber and chitosan microspheres; the nano-chitosan microspheres comprise chitosan and sodium tripolyphosphate, wherein the mass ratio of chitosan to sodium tripolyphosphate is (1~5):(0.5~2). The selection criteria for cotton fiber are as follows: good moisture absorption and easy modification; and / or possessing a tight structure that makes it difficult for bacteria to adhere, thus providing physical antibacterial effects; and / or long fibers that do not easily shed lint; and / or rapid absorption of secretions; for example, in some embodiments, it is fine-staple cotton; in other embodiments, it is long-staple cotton; or it may be one of 40s~60s combed cotton, degreased cotton, and spunlace cotton, or a mixture of multiple types in any proportion.

[0026] The plant antibacterial agent is any one of licorice extract, sophora flavescens extract, chamomile extract, scutellaria baicalensis extract, grapefruit seed extract, and artemisia argyi extract, or a mixture of multiple extracts in any proportion; preferably, it is light yellow or light green in color. For example, in some embodiments, the plant antibacterial agent is licorice extract, and in other embodiments, it is licorice extract or chamomile extract.

[0027] The natural organic acid is citric acid or lactic acid.

[0028] A method for preparing disposable underwear with antibacterial function includes the following steps: S1. Cotton fiber pretreatment: Place cotton fibers in a 40~50℃ water bath and stir for 10~20 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the cotton fiber after gas explosion is soaked in chitosan microsphere solution. After padding and drying, modified cotton fiber is obtained. S201. Dissolve chitosan in a 25-50% acetic acid solution and stir at 40-50°C for 10-20 minutes to obtain a chitosan solution with a mass fraction of 1-5%. S202. Add 0.5-2% sodium tripolyphosphate by mass to the above chitosan solution to obtain a chitosan microsphere solution; S203. Place pure cotton fibers in high-pressure saturated steam at 180~200℃, 1.0~1.5MPa, for 1~2min. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained. S3. Preparation of the moisture-wicking layer: Disperse natural plant wax and Tween 80 in an ethanol solution at a mass ratio of 1: (0.1~0.3), stir at 50~70℃ until completely dissolved to obtain a natural plant wax ethanol solution, spray the natural plant wax ethanol solution onto one side of the modified cotton fiber, and then dry it to obtain the moisture-wicking layer. S4. Moisture-wicking and absorbent layer: Repeat step S3, with the amount of natural plant wax added being 25-50% of that in step S3. Immerse the obtained moisture-wicking layer in sodium alginate (SA) solution, and then roll and dry to obtain the moisture-wicking and absorbent layer; the roll-off rate of the moisture-wicking and absorbent layer is 60-80%. S5. Preparation of antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to sodium alginate (SA), after padding and drying, and then sprayed with plant antibacterial agent to obtain antibacterial-absorbent layer; S501. Under conditions of 30~45℃, the spunlace cotton nonwoven fabric is first immersed in a 1~3% sodium alginate (SA) solution for 20~30 min at a pressure of 0.2~0.3 MPa, and then semi-dried at 60~80℃ to obtain a pretreated nonwoven fabric A with a moisture content of 15~25%; the pick-up rate of the pretreated nonwoven fabric A is 70~90%. S502. At room temperature, the pretreated nonwoven fabric A is first immersed in a 0.1~0.5% ε-polylysine aqueous solution for 10~20 minutes under a pressure of 0.15~0.2 MPa, and then completely dried at 90~105℃ to obtain pretreated nonwoven fabric B; the pretreated nonwoven fabric B has a roll-off rate of 60~80%. S503. Plant extracts are evenly dispersed in pure water, and then the pH of the solution is adjusted to 5-6 with natural organic acids to obtain plant antibacterial agents; S504. The above-mentioned plant antibacterial agent is ultrasonically impregnated onto pretreated nonwoven fabric B, and then dried with hot air at 60~80℃ to obtain an antibacterial-absorbent layer, wherein the mass fraction of the plant antibacterial agent is 3~5%; S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. Then, it is sterilized by EO or ion beam to obtain the finished disposable antibacterial underwear.

[0029] Example 1 A disposable pair of underwear with antibacterial function includes an inner crotch layer and a body layer. The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the body layer is an antibacterial-absorbent layer. By weight, The moisture-wicking layer comprises 100 parts modified cotton fiber and 4 parts candelilla wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 2 parts candelilla wax and 0.5 parts sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 1 part candelilla wax, 3 parts sodium alginate (SA), 0.3 parts ε-polylysine, 4 parts licorice extract and 3 parts citric acid; the modified cotton fiber comprises long-staple cotton fiber and chitosan microspheres; the nano-chitosan microspheres comprise chitosan and sodium tripolyphosphate, wherein the mass ratio of chitosan to sodium tripolyphosphate is 3:1.

[0030] A method for preparing disposable underwear with antibacterial function includes the following steps: S1. Cotton fiber pretreatment: Place long-staple cotton fibers in a 45℃ water bath and stir for 15 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the exploded cotton fiber is then immersed in a chitosan microsphere solution. After padding and drying, modified cotton fiber is obtained; specifically: S201. Dissolve chitosan in 50% acetic acid solution and stir at 45°C for 15 min to obtain a chitosan solution with a mass fraction of 3%. S202. Add 1% sodium tripolyphosphate to the above chitosan solution to obtain a chitosan microsphere solution. S203. Place pure cotton fibers in high-pressure saturated steam at 180°C, 1.0 MPa, and 1.5 min. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained. S3. Preparation of the moisture-wicking layer: Candelilla wax and Tween 80 are dispersed in an ethanol solution at a mass ratio of 1:0.2 and stirred at 60°C until completely dissolved to obtain a natural plant wax ethanol solution. The natural plant wax ethanol solution is sprayed onto one side of the modified cotton fiber and then dried to obtain the moisture-wicking layer. S4. Moisture-wicking and absorbent layer: Repeat step S3, the amount of candelilla wax added is 50% of the amount of candelilla wax in step S3, immerse the obtained moisture-wicking layer in a 1% sodium alginate (SA) solution, and obtain the moisture-wicking and absorbent layer by padding and drying; the roll-off rate of the moisture-wicking and absorbent layer is 70%; S5. Preparation of the antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to the sodium alginate (SA). After padding and drying, it is sprayed with a plant antibacterial agent to obtain the antibacterial-absorbent layer. The specific operation method is as follows: S501. At 40℃, the spunlace cotton nonwoven fabric is first immersed in a 2% sodium alginate (SA) solution for 25 minutes under a pressure of 0.25 MPa, and then semi-dried at 70℃ to obtain a pretreated nonwoven fabric A with a moisture content of 20%; the residual rate of the pretreated nonwoven fabric A is 70%. S502. At room temperature, the pretreated nonwoven fabric A is first immersed in a 0.3% ε-polylysine aqueous solution for 15 minutes at a pressure of 0.18 MPa, and then completely dried at 100°C to obtain a pretreated nonwoven fabric B with a roll residue of 70%. S503. Licorice extract is evenly dispersed in pure water, and the pH of the solution is adjusted to 5.5 with citric acid to obtain a 4% plant antibacterial agent by mass fraction. S504. The above-mentioned plant antibacterial agent is impregnated onto the pretreated nonwoven fabric B by ultrasonic wave, and then dried by hot air at 70°C to obtain an antibacterial-absorbent layer. S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. Then, it is sterilized by EO to obtain the finished disposable antibacterial underwear.

[0031] Example 2 Compared with Example 1, only the sterilization method in step S6 is changed from EO sterilization to ion beam sterilization, and the rest of the operation and parameters are completely the same as in Example 1.

[0032] Example 3 A disposable pair of underwear with antibacterial function includes an inner crotch layer and a body layer. The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the body layer is an antibacterial-absorbent layer. By weight, The moisture-wicking layer comprises 100 parts modified cotton fiber and 6 parts hemp wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 1.5 parts hemp wax, and 1 part sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 2 parts sodium alginate (SA), 0.5 parts ε-polylysine, 3 parts chamomile extract, and 2 parts lactic acid; the modified cotton fiber comprises long-staple cotton fiber and chitosan microspheres; the nano-chitosan microspheres comprise chitosan and sodium tripolyphosphate, wherein the mass ratio of chitosan to sodium tripolyphosphate is 5:1.

[0033] A method for preparing disposable underwear with antibacterial function includes the following steps: S1. Cotton fiber pretreatment: Place long-staple cotton fibers in a 40℃ water bath and stir for 20 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the exploded cotton fiber is then immersed in a chitosan microsphere solution. After padding and drying, modified cotton fiber is obtained; specifically: S201. Dissolve chitosan in 50% acetic acid solution and stir at 40°C for 20 min to obtain a 5% chitosan solution by mass. S202. Add 1% sodium tripolyphosphate to the above chitosan solution to obtain a chitosan microsphere solution. S203. Place pure cotton fibers in high-pressure saturated steam at 190°C, 1.5MPa, and 1min. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained. S3. Preparation of the moisture-wicking layer: Disperse hemp wax and Tween 80 in an ethanol solution at a mass ratio of 1:0.1, stir at 50°C until completely dissolved to obtain a natural plant wax ethanol solution, spray the natural plant wax ethanol solution onto one side of the modified cotton fiber, and then dry it to obtain the moisture-wicking layer. S4, Moisture-wicking and absorbent layer: Repeat step S3, the amount of hemp wax added is 25% of the hemp wax in step S3, immerse the obtained moisture-wicking layer in a 1% sodium alginate (SA) solution, and obtain the moisture-wicking and absorbent layer by padding and drying; the roll-off rate of the moisture-wicking and absorbent layer is 60%; S5. Preparation of the antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to the sodium alginate (SA). After padding and drying, it is sprayed with a plant antibacterial agent to obtain the antibacterial-absorbent layer. The specific operation method is as follows: S501. At 45℃, the spunlace cotton nonwoven fabric is first immersed in a 3% sodium alginate (SA) solution for 30 minutes under a pressure of 0.3 MPa, and then semi-dried at 80℃ to obtain a pretreated nonwoven fabric A with a moisture content of 15%; the residual rate of the pretreated nonwoven fabric A is 70%. S502. At room temperature, the pretreated nonwoven fabric A is first immersed in a 0.1% ε-polylysine aqueous solution for 20 minutes at a pressure of 0.2 MPa, and then completely dried at 90°C to obtain pretreated nonwoven fabric B; the pretreated nonwoven fabric B has a pick-up rate of 70%. S503. Chamomile extract is evenly dispersed in pure water, and then the pH of the solution is adjusted to 5 with lactic acid to obtain a 3% plant antibacterial agent by mass fraction. S504. The above-mentioned plant antibacterial agent is impregnated onto the pretreated nonwoven fabric B by ultrasonic wave, and then dried by hot air at 60°C to obtain an antibacterial-absorbent layer. S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. Then, it is sterilized by EO to obtain the finished disposable antibacterial underwear.

[0034] Example 4 A disposable pair of underwear with antibacterial function includes an inner crotch layer and a body layer. The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the body layer is an antibacterial-absorbent layer. By weight, The moisture-wicking layer comprises 100 parts modified cotton fiber and 2 parts rice bran wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 1 part rice bran wax and 0.8 parts sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 1 part sodium alginate (SA), 0.1 parts ε-polylysine, 5 parts grapefruit seed extract and 5 parts lactic acid; the modified cotton fiber comprises combed cotton fiber and chitosan microspheres; the nano-chitosan microspheres comprise chitosan and sodium tripolyphosphate, wherein the mass ratio of chitosan to sodium tripolyphosphate is 4:1.

[0035] A method for preparing disposable underwear with antibacterial function includes the following steps: S1. Cotton fiber pretreatment: Place long-staple cotton fibers in a 50℃ water bath and stir for 10 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the exploded cotton fiber is then immersed in a chitosan microsphere solution. After padding and drying, modified cotton fiber is obtained; specifically: S201. Dissolve chitosan in 37.5% acetic acid solution and stir at 50°C for 10 min to obtain a chitosan solution with a mass fraction of 4%. S202. Add 1% sodium tripolyphosphate to the above chitosan solution to obtain a chitosan microsphere solution. S203. Place pure cotton fibers in high-pressure saturated steam at 200°C, 1.2 MPa, for 2 minutes. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained. S3. Preparation of the moisture-wicking layer: Disperse rice bran wax and Tween 80 in an ethanol solution at a mass ratio of 1:0.3, stir at 70°C until completely dissolved to obtain a natural plant wax ethanol solution, spray the natural plant wax ethanol solution onto one side of the modified cotton fiber, and then dry it to obtain the moisture-wicking layer. S4, Moisture-wicking and absorbent layer: Repeat step S3, the amount of rice bran wax added is 50% of the amount of rice bran wax in step S3, immerse the obtained moisture-wicking layer in a 0.8% sodium alginate (SA) solution, and obtain the moisture-wicking and absorbent layer by padding and drying; the roll-off rate of the moisture-wicking and absorbent layer is 80%; S5. Preparation of the antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to the sodium alginate (SA). After padding and drying, it is sprayed with a plant antibacterial agent to obtain the antibacterial-absorbent layer. The specific operation method is as follows: S501. At 35℃, the spunlace cotton nonwoven fabric is first immersed in a 1% sodium alginate (SA) solution for 20 minutes under a pressure of 0.25 MPa, and then semi-dried at 60℃ to obtain a pretreated nonwoven fabric A with a moisture content of 25%; the residual rate of the pretreated nonwoven fabric A is 90%. S502. At room temperature, the pretreated nonwoven fabric A is first immersed in a 0.5% ε-polylysine aqueous solution for 10 minutes at a pressure of 0.15 MPa, and then completely dried at 105℃ to obtain a pretreated nonwoven fabric B with a roll residue of 70%. S503. Grapefruit seed extract is evenly dispersed in pure water, and then the pH of the solution is adjusted to 6 with lactic acid to obtain a 5% plant antibacterial agent by mass fraction. S504. The above-mentioned plant antibacterial agent is impregnated onto the pretreated nonwoven fabric B by ultrasonic wave, and then dried by hot air at 80°C to obtain an antibacterial-absorbent layer. S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. Then, it is sterilized by EO to obtain the finished disposable antibacterial underwear.

[0036] Comparative Example 1 Compared with Example 1, cotton fibers are not involved in the modification, and the remaining operations and parameters are completely consistent with Example 1.

[0037] Comparative Example 2 Compared with Example 1, the key steps of sodium alginate (SA) are not added, and the remaining operations and parameters are completely consistent with Example 1.

[0038] Comparative Example 3 Compared with Example 1, ε-polylysine was not added, and the rest of the operations and parameters were completely consistent with Example 1.

[0039] Comparative Example 4 Compared with Example 1, no natural plant wax was added, and the rest of the operations and parameters were completely the same as in Example 1.

[0040] Comparative Example 5 Compared with Example 1, no natural organic acids were added, and the rest of the operations and parameters were completely consistent with Example 1.

[0041] The disposable underwear with antibacterial properties prepared according to the present invention was tested. The disposable underwear prepared in Examples 1-4 and Comparative Examples 1-5, or the inner crotch layer and pant body layer before and after modification, were tested. A total of 9 groups were tested, and each group was tested three times. The average value was taken.

[0042] 1. Antibacterial properties: The test index is the antibacterial effect before and after washing and before and after wear resistance, mainly targeting three types of bacteria: Staphylococcus aureus, Escherichia coli and Candida albicans. (1) Antibacterial performance test before and after washing: After the fabric to be tested (including the inner crotch layer and the pant body layer) was washed for 50 minutes, the antibacterial effect before and after washing was tested respectively. (2) Antibacterial retention rate test before and after abrasion resistance: The test fabrics (including the inner crotch layer and the pant body layer) were recorded separately, using the following formula: Note: A higher retention rate indicates a stronger bond between the modified chitosan, natural plant wax, and flavonoid antibacterial agent.

[0043] 2. Physical properties: The tests mainly focus on the cotton fibers and nonwoven fabrics before and after modification, with the test indicators being moisture absorption and moisture wicking. (1) Moisture absorption performance is mainly characterized by moisture absorption rate. The testing standards are: moisture absorption rate of the inner crotch layer is greater than 100%, and moisture absorption rate of the body layer is greater than 80%. The following formula is used for calculation: (Note: This indicates the weight after soaking in deionized water for 30 minutes. (Indicates weight before soaking) (2) The moisture-wicking performance is mainly characterized by the moisture wicking rate. The moisture wicking rate is tested by adjusting the fabric under standard temperature and humidity conditions to achieve moisture equilibrium, and then using the water droplet method to determine the time for the water droplet to completely penetrate, which characterizes the instantaneous moisture wicking capacity. The test standard is: penetration time ≤ 10s.

[0044] 3. Safety Testing: The safety of the disposable underwear prepared according to this invention will be tested after sterilization, and will be described from the following aspects: (1) Microbiological safety: mainly the detection of total bacterial count, with the detection standard being ≤20 CFU / g; (2) Pathogenic bacteria screening: mainly targeting the following bacteria, namely Staphylococcus aureus, coliform bacteria, Pseudomonas aeruginosa, Candida albicans and hemolytic streptococci, with the standard being that they should not be detected; (3) Screening for carcinogens: formaldehyde, carcinogenic aromatic amines and fluorescent agents, the detection standard is that they must not be detected. (4) pH value: Based on the characteristic that the human private parts are weakly acidic, the pH value of the disposable underwear fabric (including the crotch and the body) of the present invention is controlled at 5.0~6.5.

[0045] Note: "-" indicates not detected; "√" indicates qualified, which means the total bacterial count is ≤20 CFU / g in the safety performance test; "×" indicates unqualified.

[0046] The disposable antibacterial underwear prepared according to this invention was subjected to performance tests in three aspects: antibacterial performance, physical performance, and safety performance. (1) The antibacterial performance test mainly involved three bacteria: Staphylococcus aureus, Escherichia coli, and Candida albicans. By comparing their antibacterial performance before and after washing, Table 1 shows that the antibacterial rates of the disposable underwear prepared in Examples 1-4 against the three major pathogens before washing were S. aureus > 99%, E. coli > 96%, and C. albicans > 92%, respectively; after 50 washes, S. aureus > 93%, E. coli > 90%, and C. albicans > 85%. The average antibacterial rate of the three bacteria before and after the experiment was calculated, and the antibacterial retention rate of the disposable underwear of the present invention was ≥ 93.4%, which meets the requirements of long-lasting antibacterial effect. In Comparative Examples 1 and 4, the cotton fibers were not involved in the modification process, or the key step of removing natural plant waxes during the preparation of the moisture-wicking layer resulted in a decrease in moisture-wicking properties, leading to a reduction in antibacterial properties. In Comparative Examples 2 and 3, sodium alginate (SA) or ε-polylysine did not participate in the reaction. The data showed that the antibacterial retention rate decreased significantly, proving that without sodium alginate (SA) as a "binder" or lacking ε-polylysine for cross-linking, the antibacterial factors were easily detached, resulting in a decrease in antibacterial properties. (2) In terms of physical properties, including moisture absorption and moisture wicking, the inner crotch layer and the pant body layer were tested respectively; 1) Regarding moisture absorption, the moisture absorption rate of the inner crotch layer in Examples 1-4 reached 139-148.5%, and the moisture absorption rate of the trouser body layer reached 90-95.3%. In contrast, in Comparative Example 2, sodium alginate (SA) did not participate in the reaction, and its moisture absorption effect was significantly weakened, proving that sodium alginate (SA) not only acts as an "adhesive" but also has excellent moisture absorption properties. 2) Regarding moisture wicking, the water droplet penetration time of the inner lining layer in Examples 1-4 was 4.2-5.6s, all ≤10s standard, and the trouser body layer was 4.4-5.1s, indicating that the moisture wicking of the chitosan-modified cotton fiber combined with the single-sided coating of natural plant wax was significantly accelerated. In Comparative Examples 1 and 4, the moisture wicking effect decreased because the cotton fiber was not modified or the natural plant wax coating was removed, proving that both chitosan-modified cotton fiber and coating on the surface of cotton fiber can improve moisture wicking performance.

[0047] (3) Regarding safety performance, this includes pH value, total bacterial count, pathogenic bacteria, and carcinogenic aromatic hydrocarbons. As shown in Table 1 above, the disposable underwear sterilized by EO or ion beam sterilization is free of pathogenic bacteria, formaldehyde, fluorescent agents, and carcinogenic aromatic amines, and the total bacterial count is ≤20 CFU / g. The pH value range of Examples 1 to 4 is between 5.6 and 6.1, which is weakly acidic and can achieve the purpose of mildness and low sensitivity. As shown in Comparative Example 5, this is because organic acids play a role in adjusting the pH during the preparation of disposable underwear. Since the human private parts are weakly acidic, the pH value of the disposable underwear prepared by this invention meets the requirements. Too acidic or too alkaline pH will lead to a decrease in antibacterial performance or an increase in irritation.

[0048] Conclusion: The three-layer composite structure of the disposable underwear with antibacterial function prepared in this invention consists of an inner crotch layer (moisture-wicking layer and moisture-wicking-absorbent layer) with physical antibacterial and fast moisture-wicking properties, and a pant body layer (antibacterial-absorbent layer) with antibacterial and high breathability. Through the synergistic effect of physical antibacterial and bio-based antibacterial properties, it achieves long-lasting antibacterial effect throughout the entire area. Unmodified cotton fibers lacking modified chitosan or natural plant waxes will result in a sharp drop in antibacterial properties, slower moisture wicking, and a pH deviation from weak acidity, which cannot meet the needs of long-term wear.

[0049] Finally, it should be noted that although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A disposable pair of underwear with antibacterial function, comprising an inner crotch layer and a body layer, characterized in that, The inner crotch layer includes a moisture-wicking layer and a moisture-wicking-absorbent layer, and the pant body layer is an antibacterial-absorbent layer; by weight... The moisture-wicking layer comprises 100 parts modified cotton fiber and 2-6 parts natural plant wax; the moisture-wicking-absorbent layer comprises 100 parts modified cotton fiber, 1-3 parts natural plant wax and 0.5-1 parts sodium alginate (SA); the antibacterial-absorbent layer comprises 100 parts spunlace cotton nonwoven fabric, 1-3 parts sodium alginate (SA), 0.1-0.5 parts ε-polylysine, 3-5 parts plant antibacterial agent and 2-5 parts natural organic acid; The modified cotton fiber includes cotton fiber and chitosan microspheres; the nano-chitosan microspheres include chitosan and sodium tripolyphosphate, and the mass ratio of chitosan to sodium tripolyphosphate is (1~5):(0.5~2).

2. The disposable underwear with antibacterial function according to claim 1, characterized in that, The natural plant wax is one of candelilla wax, hemp wax, and rice bran wax, or a mixture of several in any proportion.

3. The disposable underwear with antibacterial function according to claim 2, characterized in that, The plant antibacterial agent is any one of licorice extract, sophora flavescens extract, chamomile extract, scutellaria baicalensis extract, grapefruit seed extract, and artemisia argyi extract, or a mixture of multiple extracts in any proportion.

4. The disposable underwear with antibacterial function according to claim 3, characterized in that, The natural organic acid is lactic acid or citric acid.

5. A method for preparing disposable underwear with antibacterial function as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Cotton fiber pretreatment: Place cotton fibers in a 40~50℃ water bath and stir for 10~20 minutes to remove impurities. Then centrifuge and dry to obtain pure cotton fibers for later use. S2. Preparation of modified cotton fiber: Pure cotton fiber is placed in high-pressure saturated steam, and the cotton fiber after gas explosion is soaked in chitosan microsphere solution. After impregnation and drying, modified cotton fiber is obtained. S3. Preparation of the moisture-wicking layer: Disperse natural plant wax and Tween 80 in an ethanol solution at a mass ratio of 1:(0.1~0.3), stir at 50~70℃ until completely dissolved to obtain a natural plant wax ethanol solution, spray the natural plant wax ethanol solution onto one side of the cotton fiber loaded with modified chitosan, and then dry it to obtain the moisture-wicking layer. S4. Moisture-wicking and absorbent layer: Repeat step S3, the amount of natural plant wax added is 25-50% of the amount of natural plant wax in step S3, immerse the obtained moisture-wicking layer in sodium alginate (SA) solution, and obtain the moisture-wicking and absorbent layer by padding and drying; the padding rate of the moisture-wicking and absorbent layer is 60-80%; S5. Preparation of antibacterial-absorbent layer: Spunlace cotton nonwoven fabric is soaked in sodium alginate (SA) solution, then ε-polylysine is added to sodium alginate (SA), after padding and drying, and then sprayed with plant antibacterial agent to obtain antibacterial-absorbent layer; S6. The composite layer of the moisture-wicking layer and the moisture-wicking-absorbent layer from steps S4 to S5 is used as the inner crotch layer, and the antibacterial-absorbent layer from step S5 is used as the pant body layer to obtain disposable underwear. After sterilization, disposable antibacterial underwear is obtained.

6. The method for preparing disposable underwear with antibacterial function according to claim 5, characterized in that, The specific preparation method of the modified cotton fiber in step S2 is as follows: S201. Dissolve chitosan in a 25-50% acetic acid solution and stir at 40-50°C for 10-20 minutes to obtain a chitosan solution with a mass fraction of 1-5%. S202. Add 0.5-2% sodium tripolyphosphate by mass to the above chitosan solution to obtain a chitosan microsphere solution; S203. Place pure cotton fibers in high-pressure saturated steam at 180~200℃, 1.0~1.5MPa, for 1~2 minutes. Immerse the gas-exploded cotton fibers in a chitosan microsphere solution. After impregnation and drying, modified cotton fibers are obtained.

7. The method for preparing disposable underwear with antibacterial function according to claim 5, characterized in that, The specific preparation method of the antibacterial-absorbent layer in step S5 is as follows: S501. Soak the spunlace cotton nonwoven fabric in sodium alginate (SA) solution, perform the first impregnation and dry it to obtain pretreated nonwoven fabric A. The pretreated nonwoven fabric A has a roll-off rate of 70-90%; S502. The pretreated nonwoven fabric A is immersed in ε-polylysine solution and then subjected to a second impregnation and drying to obtain the pretreated nonwoven fabric B. The pretreated nonwoven fabric B has a roll-off rate of 60-80%; S503. Disperse flavonoid-containing plant extracts evenly in pure water, and then adjust the pH of the solution to 5-6 with natural organic acids to obtain plant antibacterial agents; S504. The above-mentioned plant antibacterial agent is ultrasonically impregnated onto the pretreated nonwoven fabric B, and then dried with hot air at 60~80℃ to obtain an antibacterial-absorbent layer, wherein the mass fraction of the plant antibacterial agent is 3~5%.

8. The method for preparing disposable underwear with antibacterial function according to claim 7, characterized in that, The first impregnation and drying in step S501 specifically involves: first impregnating at a temperature of 30~45℃ for 20~30 minutes with a pressure of 0.2~0.3 MPa, and then semi-drying at 60~80℃ to obtain a pretreated nonwoven fabric A with a moisture content of 15~25%. The second impregnation and drying in step S502 specifically involves immersing the pretreated nonwoven fabric A in an ε-polylysine aqueous solution at room temperature for 10-20 minutes under a pressure of 0.15-0.2 MPa, followed by complete drying at 90-105°C to obtain the pretreated nonwoven fabric B.

9. The method for preparing disposable underwear with antibacterial function according to claim 7, characterized in that, The sodium alginate (SA) solution in step S501 has a mass fraction of 1-3%, and the ε-polylysine in step S502 has a mass fraction of 0.1-0.5%.

10. The method for preparing disposable underwear with antibacterial function according to any one of claims 6 to 9, characterized in that, The sterilization method described in step S6 is either EO sterilization or electron beam sterilization.

Images