Sanitary napkin with synergistic bacteriostasis and long-acting deodorization functions and preparation method of sanitary napkin

Abstract

The invention belongs to the technical field of hygienic products, and discloses a sanitary napkin with synergistic bacteriostasis and long-acting deodorization functions and a preparation method of the sanitary napkin. The anti-bacterial and anti-bacterial insole sequentially comprises an anti-bacterial flow guide layer, a peculiar smell decomposition layer, a moisture-absorbing and anti-bacterial core body and a breathable and anti-seepage bottom layer from Wherein the bacteriostatic diversion layer is a non-woven fabric which is prepared by compounding polylactic acid fibers serving as a basic fiber material, nano zinc oxide and a plant extract; the peculiar smell decomposition layer is a composite material which takes chitosan as a matrix and contains a Fe < 3 + >-loaded metal organic framework; the moisture-absorbing antibacterial core body is a composite core body prepared from high-molecular water-absorbent resin and quaternary ammonium salt modified bamboo fibers through an air laying process; the breathable anti-seepage bottom layer is a composite layer composed of a TPU film and non-woven fabric. According to the sanitary towel, on one hand, growth and reproduction of microorganisms are inhibited, and peculiar smells are removed; on the other hand, breathability of the sanitary napkin is improved, and female vulva is kept dry. The preparation method is simple, low in cost and convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sanitary products, in particular to a sanitary napkin with synergistic antibacterial and long-acting deodorizing functions and a preparation method thereof. BACKGROUND

[0002] The sanitary napkin is a personal hygiene care product for women during menstruation. There are various types of sanitary napkins on the market. During menstruation, the resistance of the female reproductive organs decreases, and they are more vulnerable than usual and prone to infection. In addition, the menstrual blood contains rich nutrients, and bacteria can multiply and grow in a very short time, making the reproductive organs susceptible to infection. Unhygienic use can easily cause bacterial infection and lead to some gynecological diseases.

[0003] Traditional sanitary napkins rely on a single antibacterial agent (such as silver ions), which can easily lead to short antibacterial duration (<12 hours) due to poor material bonding. Odor control often uses fragrances to mask or simple activated carbon adsorption, which cannot decompose sulfur-containing odor source substances. Poor air permeability of the bottom layer leads to a local humid environment, accelerating the reproduction of anaerobic bacteria. Commercial antibacterial sanitary napkins generally use the following bacteriostatic agents: nano-silver: although it has broad-spectrum antibacterial properties, it has cytotoxicity (IC 50 value of about 15 μg / mL) caused by silver ion migration; triclosan: prone to bacterial resistance (experiments show that the MIC value of Staphylococcus aureus increases by 32 times after 10 generations of culture); quaternary ammonium salt: ineffective with anionic surfactants, and long-term use disrupts the balance of skin flora.

[0004] CN 107456321 A discloses a nano-silver antibacterial sanitary napkin and its production method, which uses a chitosan / silver ion composite coating. Although it has good antibacterial properties, it does not solve the problem of odor adsorption.

[0005] CN 220175393 U provides a sanitary napkin with bactericidal and bacteriostatic functions, which enables the sanitary napkin to have bactericidal and bacteriostatic functions, preventing bacterial infection caused by long use or poor hygiene by the user. However, the disclosure does not provide any other instructions.

[0006] CN 107670092 A discloses a sanitary napkin with health care functions, which impregnates antibacterial health care traditional Chinese medicine extract into the core layer of the sanitary napkin, enabling the sanitary napkin to have biological antibacterial, moisture absorption, and odor removal properties. However, it has poor water absorption and air permeability. SUMMARY

[0007] In view of the above problems existing in the prior art, the purpose of the present application is to provide a sanitary napkin with synergistic antibacterial and long-acting deodorizing functions and a preparation method thereof. The preparation method is simple, low in cost, and easy to operate.

[0008] To solve the above problems, the present application provides the following technical solutions: In a first aspect, the application provides a sanitary napkin with synergistic antibacterial and long-acting odor removal functions, which is composed of an antibacterial flow guide layer, an odor decomposition layer, a moisture-absorbing antibacterial core body, and a breathable and anti-seepage bottom layer from top to bottom.

[0009] In an embodiment of the application, the antibacterial flow guide layer is a non-woven fabric made of polylactic acid fibers as base fiber material, compounded with nano-zinc oxide and plant extracts.

[0010] In an embodiment of the application, the odor decomposition layer is a composite material containing Fe 3+ -loaded metal organic frameworks based on chitosan.

[0011] In an embodiment of the application, the moisture-absorbing antibacterial core body is a composite core body made of high molecular water-absorbing resin and quaternary ammonium salt modified bamboo fibers by air-laid process.

[0012] In an embodiment of the application, the breathable and anti-seepage bottom layer is a composite layer composed of TPU film and non-woven fabric.

[0013] In an embodiment of the application, the antibacterial flow guide layer is the skin contact layer, which provides broad-spectrum antibacterial properties by destroying bacterial cell membranes with nano-zinc oxide, reduces skin irritation by providing biodegradability with polylactic acid fibers, and provides additional soothing effects by synergistic antibacterial action with plant extracts, thereby providing a comfortable use experience.

[0014] In an embodiment of the application, the odor decomposition layer catalytically oxidizes and decomposes odor molecules such as hydrogen sulfide and ammonia gas with Fe 3+ , and chitosan adsorbs acidic volatile substances.

[0015] In an embodiment of the application, the high molecular water-absorbing resin (Super Absorbent Polymer, SAP) can quickly absorb liquid and lock water to prevent back seepage and keep dry.

[0016] In an embodiment of the application, the bamboo fibers modified with quaternary ammonium salt have contact-type sterilization ability to inhibit pathogens such as Escherichia coli and Candida albicans.

[0017] In an embodiment of the application, the plant extract is at least one selected from the group consisting of wormwood extract and tea tree essential oil.

[0018] In an embodiment of the application, the grammage of the antibacterial flow guide layer is 20-30 g / m².

[0019] In an embodiment of the application, the porosity of the odor decomposition layer is ≥90%.

[0020] In an embodiment of the present application, the porous structure facilitates the contact between odor molecules and active sites, thereby improving the efficiency of odor decomposition.

[0021] In an embodiment of the present application, the pore size of the TPU film is 5-20 μm.

[0022] In an embodiment of the present application, the air permeability of the air-permeable and impermeable bottom layer is ≥1000 mL / (cm²·h).

[0023] In a second aspect, the present application provides a method for preparing a sanitary napkin with synergistic antibacterial and long-lasting odor removal functions, comprising the following steps: S1, dipping polylactic acid fibers in a mixed solution of nano-zinc oxide dispersion, wormwood extract and tea tree oil, and then drying and forming after ultrasonic treatment to obtain an antibacterial and moisture-conducting layer; S2, blending MIL-101(Fe) powder with chitosan solution and freeze-drying to obtain an odor decomposition layer; S3, preparing a moisture-absorbing and antibacterial core by air-laying process of high molecular water-absorbing resin and quaternary ammonium salt modified bamboo fiber; S4, sequentially stacking the antibacterial and moisture-conducting layer, the odor decomposition layer, the moisture-absorbing and antibacterial core, and the air-permeable and impermeable bottom layer from top to bottom to obtain a sanitary napkin with synergistic antibacterial and long-lasting odor removal functions.

[0024] In an embodiment of the present application, in step S1, the mass fraction of nano-zinc oxide in the nano-zinc oxide dispersion is 2-5 wt.%.

[0025] In an embodiment of the present application, in step S1, the addition amount of wormwood extract is 0.5-1% of the mass of polylactic acid fibers.

[0026] In an embodiment of the present application, in step S1, the addition amount of tea tree oil is 0.5-1% of the mass of polylactic acid fibers.

[0027] In an embodiment of the present application, in step S1, the frequency of ultrasonic treatment is 20-60 kHz.

[0028] In an embodiment of the present application, in step S1, the frequency of ultrasonic treatment is 40 kHz.

[0029] In an embodiment of the present application, in step S1, the ultrasonic treatment time is 10-50 min.

[0030] In an embodiment of the present application, in step S1, the ultrasonic treatment time is 30 min.

[0031] In an embodiment of the present application, in step S2, the amount of MIL-101(Fe) powder added is 5-10% of the mass of chitosan.

[0032] In an embodiment of the present application, in step S2, the chitosan solution is prepared by dissolving chitosan in a 2% acetic acid solution.

[0033] In an embodiment of the present application, in step S2, the temperature for freeze-drying is -40 to -60°C.

[0034] In an embodiment of the present application, in step S2, the freeze-drying time is 24 h.

[0035] In an embodiment of the present application, in step S3, the mass ratio of the high-molecular water-absorbing resin to the quaternary ammonium salt modified bamboo fiber is 3:1.

[0036] In an embodiment of the present application, in step S3, the quaternary ammonium salt is at least one selected from 3-chloro-2-hydroxypropyl trimethylammonium chloride, hydroxypropyl trimethylammonium chloride, and octadecyl trimethylammonium chloride.

[0037] Compared with the prior art, the present application has the following beneficial effects: (1) The sanitary napkin provided by the present application has the functions of synergistic antibacterial and long-acting odor removal, is composed of an antibacterial and conductive layer, an odor decomposition layer, a moisture-absorbing and antibacterial core body, and a breathable and anti-seepage bottom layer, can inhibit the growth and reproduction of microorganisms and remove odors, and can improve the air permeability of the sanitary napkin and keep the female external genitalia dry.

[0038] (2) The sanitary napkin provided by the present application has the functions of synergistic antibacterial and long-acting odor removal, the antibacterial layer is obtained by using zinc oxide, wormwood extract, and tea tree essential oil, the inorganic antibacterial agent and the plant extract synergistically inhibit the breeding and reproduction of microorganisms, do not rely on a single antibacterial agent, have a long antibacterial time, have a protective effect on the skin mucosa, reduce irritation, and avoid skin itching. The Fe-MOF catalyzes the oxidation of sulfur-containing compounds, and the chitosan adsorbs acidic small molecules, so that the source of odor is removed.

[0039] (3) The preparation method of the sanitary napkin provided by the present application has the functions of synergistic antibacterial and long-acting odor removal, the preparation method of the present application is simple, has low cost, and is easy to operate. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] Unless otherwise specified, all materials and reagents used in the following examples are commercially available. Example 1

[0042] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0043] The antibacterial properties were quantitatively tested using the national standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Oscillation method". The antibacterial rate was 98% for Escherichia coli and 97% for Staphylococcus aureus.

[0044] According to the method disclosed in Appendix B of GB / T3013-2013, the reabsorption amount of the sample was tested; the sample size was 100×100mm, and the test was repeated 3-5 times, and the average value was recorded. The measured liquid reabsorption amount was 0.5 g.

[0045] According to GB / T24218.8-2010 "Textiles - Test Methods - Part 8: Determination of Liquid Penetration Time (Simulated Urine)", the measured liquid penetration time is 2 s.

[0046] According to BS ISO 17299-2:2014 "Determination of deodorizing properties of textiles - Part 2: Test tube method", the odor decomposition efficiency (H2S) was 85% and the odor decomposition efficiency (NH3) was 80%. Example 2

[0047] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0048] Compared with Example 1, the sanitary napkin prepared in Example 2 had an antibacterial rate of 99% against Escherichia coli and an antibacterial rate of 98% against Staphylococcus aureus, demonstrating excellent antibacterial performance. Example 3

[0049] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:2, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0050] Compared with Example 1, the liquid reabsorption amount measured in Example 3 was 0.6 g. It can be seen that changing the mass ratio of ammonium salt modified bamboo fiber to superabsorbent polymer particles slightly increases the liquid reabsorption amount. Example 4

[0051] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 5 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0052] Compared to Example 1, the liquid penetration time measured in Example 4 was 2.5 s. This shows that reducing the pore size of the TPU film affects the liquid penetration rate. Example 5

[0053] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm and 100 g of nonwoven fabric are hot-pressed together to obtain a composite layer with an air permeability of 1500 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0054] Compared with Example 1, the liquid penetration time measured in Example 5 was 1.8 s, and the high air permeability is conducive to the rapid liquid penetration. Example 6

[0055] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.5 g of MIL-101 (Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0056] The test results showed that the antibacterial rate of Escherichia coli in Example 6 was 97%, and the antibacterial rate of Staphylococcus aureus was 96%; the liquid re-permeation volume was 0.5 g; the liquid penetration time was 2 s; the odor decomposition efficiency (H2S) was 75%, and the odor decomposition efficiency (NH3) was 70%. Example 7

[0057] A method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 1.0 g of MIL-101 (Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0058] Testing showed that the antibacterial rate of Escherichia coli in Example 7 was 98%, and the antibacterial rate of Staphylococcus aureus was 97%; the liquid reabsorption amount was 0.5 g; the liquid penetration time was 2 s; the odor decomposition efficiency (H2S) was 90%, and the odor decomposition efficiency (NH3) was 85%. It is evident that a 10% addition of MIL-101(Fe) resulted in the best odor decomposition efficiency.

[0059] Comparative Example 1 A method for preparing a sanitary napkin includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60 ℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0060] Tests showed that, compared to Comparative Example 1, which did not contain nano zinc oxide, the antibacterial rate of the sanitary napkin was significantly reduced, with an antibacterial rate of 82% against Escherichia coli and 80% against Staphylococcus aureus; the liquid reabsorption rate was 0.5 g; the liquid penetration time was 2 s; and the odor decomposition efficiency (H2S) was 85% and the odor decomposition efficiency (NH3) was 80%.

[0061] Comparative Example 2 A method for preparing a sanitary napkin includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. Add 0.75 g of MIL-101(Fe) powder, sonicate at 40 kHz for 30 min, stir magnetically for 2 h, inject the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Mix ordinary bamboo fiber with super absorbent polymer particles at a mass ratio of 1:3, and then composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0062] Testing revealed that the sanitary napkins in Comparative Example 2, which did not contain quaternary ammonium salt modified bamboo fiber, had a significantly reduced antibacterial rate. The antibacterial rate against Escherichia coli was 87%, and against Staphylococcus aureus was 85%. The liquid reabsorption rate was 0.5 g, the liquid penetration time was 2 s, and the odor decomposition efficiency (H2S) was 85% and the odor decomposition efficiency (NH3) was 80%.

[0063] Comparative Example 3 A method for preparing a sanitary napkin includes the following steps: S1. 100 g of polylactic acid fiber was impregnated in a mixed solution of 500 mL of 3% nano zinc oxide dispersion, 3 g of Artemisia argyi extract and 3 g of tea tree essential oil. After ultrasonic treatment at 40 kHz for 30 min, it was dried in an oven at 60℃ to obtain a composite nonwoven fabric with a basis weight of 25 g / m² as an antibacterial and diffusing layer. S2. Dissolve 10 g of chitosan in 500 mL of 2% acetic acid solution to form a chitosan solution. After ultrasonic treatment at 40 kHz for 30 min, stir magnetically for 2 h. Pour the mixture into a mold, pre-freeze at -80℃ for 12 h, and then freeze-dry at -50℃ for 24 h. The resulting porous material is used as an odor decomposition layer. S3. Dissolve 15 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride in deionized water, add NaOH to adjust the pH to 10, and add isopropanol as a dispersant. Add 100 g of bamboo fiber to the above solution and react at 60℃ for 2 h. Then neutralize, wash with water, and dry to obtain quaternary ammonium salt modified bamboo fiber. Mix the quaternary ammonium salt modified bamboo fiber with superabsorbent polymer particles at a mass ratio of 1:3, and composite them through an airflow web forming process to obtain a moisture-absorbing and antibacterial core. S4. 100 g of microporous TPU membrane with a pore size of 10 μm is hot-pressed together with 100 g of non-woven fabric to obtain a composite layer with an air permeability of 1200 mL / (cm²·h) as the first breathable and seepage-proof layer. S5. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are stacked in sequence and hot-pressed to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

[0064] The tests showed an antibacterial rate of 92% against Escherichia coli and 91% against Staphylococcus aureus; the liquid reabsorption volume was 0.5 g; the liquid penetration time was 2 s; the odor decomposition efficiency (H2S) was 40% and the odor decomposition efficiency (NH3) was 35%. It is evident that Comparative Example 3, without the addition of MIL-101(Fe) powder, had the lowest odor decomposition efficiency, indicating that MIL-101(Fe) is the key component for odor decomposition.

[0065] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. A sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions, characterized in that, From top to bottom, it consists of an antibacterial drainage layer, an odor decomposition layer, a moisture-absorbing and antibacterial core, and a breathable and leak-proof bottom layer. The antibacterial drainage layer is a non-woven fabric made of polylactic acid fiber as the base fiber material, combined with nano zinc oxide and plant extracts. The odor decomposition layer is made of chitosan as the matrix and contains Fe-loaded... 3+ The composite material is a metal-organic framework; the moisture-absorbing and antibacterial core is a composite core made of superabsorbent polymer and quaternary ammonium salt modified bamboo fiber through an airflow web forming process; the breathable and seepage-proof bottom layer is a composite layer composed of TPU film and non-woven fabric.

2. The sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 1, characterized in that, The plant extract is selected from at least one of Artemisia argyi extract and tea tree oil.

3. The sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 1, characterized in that, The weight of the antibacterial and diffusing layer is 20-30 g / m².

4. The sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 1, characterized in that, The porosity of the odor decomposition layer is ≥90%.

5. The sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 1, characterized in that, The TPU membrane has a pore size of 5-20 μm; the breathable and seepage-proof bottom layer has an air permeability of ≥1000 mL / (cm²·h).

6. The method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Polylactic acid fiber is impregnated in a mixed solution of nano zinc oxide dispersion, artemisia extract and tea tree essential oil, and then dried and shaped to obtain an antibacterial and fluid-conducting layer after ultrasonic treatment. S2. An odor decomposition layer was prepared by mixing MIL-101(Fe) powder with chitosan solution and then freeze-drying it. S3. A moisture-absorbing and antibacterial core is prepared by combining superabsorbent polymer and quaternary ammonium salt modified bamboo fiber through an airflow web forming process. S4. From top to bottom, the antibacterial diversion layer, odor decomposition layer, moisture-absorbing antibacterial core, and breathable and leak-proof bottom layer are combined to form a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions.

7. The method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 6, characterized in that, The nano zinc oxide dispersion contains 2-5 wt.% nano zinc oxide; the amount of Artemisia argyi extract added is 0.5-1% of the mass of polylactic acid fiber; and the amount of tea tree oil added is 0.5-1% of the mass of polylactic acid fiber.

8. The method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 6, characterized in that, The amount of MIL-101(Fe) powder added is 5-10% of the mass of chitosan; the chitosan solution is prepared by dissolving chitosan in 2% acetic acid solution.

9. The method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 6, characterized in that, The mass ratio of the superabsorbent polymer to the quaternary ammonium salt modified bamboo fiber is 3:

1.

10. The method for preparing a sanitary napkin with synergistic antibacterial and long-lasting deodorizing functions according to claim 6, characterized in that, The quaternary ammonium salt is selected from at least one of 3-chloro-2-hydroxypropyltrimethylammonium chloride, hydroxypropyltrimethylammonium chloride, and octadecyltrimethylammonium chloride.