Antibacterial sanitary towel containing traditional Chinese medicinal materials and preparation method thereof

Abstract

The invention relates to an antibacterial sanitary towel containing traditional Chinese medicinal materials. The antibacterial sanitary towel containing the traditional Chinese medicinal materials structurally and sequentially comprises a soft cotton layer, a modified bamboo fiber layer, a traditional Chinese medicine extract layer, an absorption layer and a bottom layer. Wherein the modified bamboo fiber is obtained by reacting a reaction product of oxidized bamboo fiber and chitosan with polydopamine. Firstly, sodium periodate is utilized to oxidize bamboo fibers to introduce aldehyde groups, then chitosan is grafted, and finally the chitosan reacts with polydopamine to form a three-dimensional network structure, so that the antibacterial property of the sanitary napkin is remarkably improved. Meanwhile, the traditional Chinese medicine extract is loaded on the PP non-woven fabric. The instant antibacterial effect of the modified bamboo fiber and the slow-release antibacterial effect of the traditional Chinese medicine extract are combined, and the synergistic antibacterial effect is achieved; due to the unique structural design, the sanitary towel has the advantages of rapid flow guide, lasting bacteriostasis and skin safety, and the use performance and comfort of the sanitary towel are comprehensively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily necessities, in particular to an antibacterial sanitary napkin containing traditional Chinese medicinal materials and a preparation method thereof. BACKGROUND

[0002] At present, sanitary napkins, as a basic product for female menstrual care, are usually composed of three parts: a surface layer, an absorbent core layer, and a bottom layer. The surface layer is usually made of non-woven fabric or soft cotton material to provide a skin-friendly touch. The absorbent layer is mainly composed of fluff pulp and high-molecular water-absorbing resin, which is used to quickly absorb and lock liquids. The bottom layer is a leakage-proof film to prevent leakage. In order to improve the comfort and hygiene performance of the product, antibacterial sanitary napkins have gradually appeared on the market. They mainly add antibacterial ingredients to the absorbent layer or the surface layer to inhibit bacterial reproduction, reduce odor, and reduce the risk of infection.

[0003] In the prior art, the antibacterial means used in antibacterial sanitary napkins mainly include three types: 1) chemical synthetic antibacterial agents, such as triclosan, p-chloro-m-cresol, or silver-based antibacterial agents, which are applied to fiber materials through blending or impregnation; 2) natural mineral or plant extracts, such as silver-loaded zeolite and bamboo charcoal powder, which exist in the absorbent core layer in the form of physical blending; and 3) biological polymer materials, such as chitosan and its derivatives, which are fixed on the surface of fibers through coating or grafting.

[0004] However, the above-mentioned existing antibacterial technology still has several significant problems. First, although chemical synthetic antibacterial agents have strong antibacterial effects, they have poor biocompatibility, and long-term contact with the skin may cause irritation, allergy, or microecological disorder, and even potential health risks. Second, the binding force of natural mineral or plant extract components (such as bamboo charcoal and ordinary chitosan) with the fiber matrix is weak, and they can easily dissolve or fall off under liquid flushing, resulting in insufficient antibacterial durability and difficulty in maintaining stable and effective antibacterial effects throughout the entire use cycle. In addition, although traditional Chinese medicine extracts (such as Huangbai and Ailu) have good antibacterial, anti-inflammatory, and soothing properties, they are easily migrated, lost, or unevenly distributed when directly added due to their strong water solubility and unstable molecular structure, which not only leads to low antibacterial efficiency but also makes it difficult to achieve local sustained action, limiting their practical application effect in sanitary products.

[0005] Therefore, the problem of how to stably, efficiently, and durably fix natural antibacterial components, especially traditional Chinese medicine extracts, in the fiber structure of sanitary napkins has not been solved in the prior art, and there is also a lack of an application scheme for functional materials that can ensure use safety and achieve long-acting and broad-spectrum antibacterial functions. SUMMARY

[0006] This invention provides an antibacterial sanitary napkin containing traditional Chinese medicine ingredients. First, aldehyde groups are introduced into bamboo fiber using sodium periodate oxidation, followed by chitosan grafting, and finally, a reaction with polydopamine to form a three-dimensional network structure, thereby significantly enhancing the antibacterial properties of the sanitary napkin. Simultaneously, traditional Chinese medicine extracts are loaded onto PP nonwoven fabric to form a layer of extracts. This invention achieves a synergistic antibacterial effect by combining the immediate antibacterial properties of modified bamboo fiber with the sustained-release antibacterial effect of traditional Chinese medicine extracts. The unique structural design combines the advantages of rapid absorption, long-lasting antibacterial properties, and skin safety, comprehensively improving the performance and comfort of the sanitary napkin.

[0007] Based on this, it is necessary to provide an antibacterial sanitary napkin containing Chinese medicinal herbs, wherein the structure of the antibacterial sanitary napkin containing Chinese medicinal herbs includes, in sequence, a soft layer, a modified bamboo fiber layer, a Chinese medicinal extract layer, an absorbent layer, and a bottom layer; The modified bamboo fiber is obtained by reacting the reaction product of oxidized bamboo fiber and chitosan with polydopamine.

[0008] Specifically, the modified bamboo fiber layer and the traditional Chinese medicine extract layer are independently placed below the soft layer and above the absorbent layer. This structural design allows the antibacterial layer to come into contact with and inhibit microorganisms before liquid seeps in, resulting in a more direct and efficient antibacterial effect. At the same time, the modified bamboo fiber does not affect the overall absorbency and breathability of the sanitary napkin.

[0009] Furthermore, the material of the soft layer is pure cotton nonwoven fabric.

[0010] Furthermore, the material of the absorbent layer is selected from one or more of sodium polyacrylate and acrylic-acrylamide copolymer.

[0011] Furthermore, the underlying material is a PE (polyethylene) film.

[0012] Furthermore, the herbal extract is selected from one or more of Artemisia argyi extract, Phellodendron chinense extract, Centella asiatica extract, and Galla chinensis extract.

[0013] Specifically, after the Chinese herbal extracts are loaded with PP (polypropylene) non-woven fabric, the concentration of active ingredients in direct contact with the skin can be reduced, which can reduce the skin discomfort that high concentrations of extracts may cause. This synergistically ensures that the product can take into account both antibacterial effect and skin safety during long-term close contact use, and is suitable for the needs of sensitive skin during menstruation.

[0014] Furthermore, the viscosity of the chitosan is 100-200 mPa·s.

[0015] The present invention also provides a method for preparing the antibacterial sanitary napkin containing traditional Chinese medicinal materials, comprising the following steps: S1. Chitosan and oxidized bamboo fiber are mixed and reacted. Then polydopamine and glutaraldehyde are added and reacted to obtain modified bamboo fiber. S2. The modified bamboo fiber is prepared into a bamboo fiber mesh, and then hydroentangled to obtain a modified bamboo fiber layer. S3. Soak the non-woven fabric in the Chinese herbal extract to obtain the Chinese herbal extract layer; S4. The soft layer, modified bamboo fiber layer, traditional Chinese medicine extract layer, absorbent layer, and bottom layer are combined into one piece to obtain an antibacterial sanitary napkin containing traditional Chinese medicine.

[0016] The bamboo fiber, chitosan, polydopamine, and traditional Chinese medicine extracts used in this invention are all biocompatible natural substances. This system achieves antibacterial effects through physical adsorption and biochemical processes, avoiding the skin irritation, allergic reactions, and ecotoxicity risks that small-molecule chemical antibacterial agents may cause. It is especially suitable for sensitive skin, providing a gentler and safer antibacterial solution.

[0017] Specifically, the bamboo fiber used in this invention possesses excellent air permeability and antibacterial properties; chitosan, as a natural antibacterial agent, can disrupt bacterial cell membranes through positive charge adsorption; the polydopamine layer further enhances the material's antibacterial adhesion properties; finally, the traditional Chinese medicine extract layer can release antibacterial active ingredients, interfering with and inhibiting microbial growth through multiple pathways. This multi-mechanism synergistic effect overcomes the limitations of single antibacterial components, significantly improving the broad-spectrum and efficiency of antibacterial action.

[0018] Further, in step S1, the mass ratio of chitosan to oxidized bamboo fiber is 0.5-1:4-6.

[0019] Furthermore, in step S1, the reaction temperature is 20-30°C.

[0020] The present invention has the following beneficial effects: This invention uses modified bamboo fiber and traditional Chinese medicine extracts as antibacterial materials for sanitary napkins. First, bamboo fiber is oxidized with sodium periodate to obtain bamboo fiber containing aldehyde groups. Then, some of the aldehyde groups on its surface react with chitosan to introduce chitosan into the modified bamboo fiber. Next, polydopamine is added to react the remaining aldehyde groups on its surface with polydopamine to form a stable three-dimensional network structure. This structure significantly enhances the mechanical properties and antibacterial ability of the modified bamboo fiber layer. This invention utilizes a specific ratio of oxidized bamboo fiber and chitosan to react, and further introduces uniformly distributed polydopamine onto the surface of the modified bamboo fiber. This avoids the aggregation of bamboo fiber and chitosan, as well as the uneven distribution of polydopamine, thereby improving the overall antibacterial strength of the modified bamboo fiber layer. Moreover, the introduction of polydopamine can fill the gaps in the modified bamboo fiber, improving the overall density of the modified bamboo fiber layer. This not only prevents the modified bamboo fiber from falling off during use, but also prevents backflow of menstrual blood, thus improving user comfort. Secondly, due to the high hydrophilicity of polydopamine and chitosan, menstrual blood can quickly penetrate downwards, preventing it from lingering on the surface and creating a moist environment. This keeps the skin contact surface dry and fundamentally destroys the moist environment required for microbial reproduction, thereby significantly improving the breathability and antibacterial properties of sanitary napkins. In addition, modified bamboo fiber can form hydrogen bonds with the Chinese herbal extract layer, enhancing the interfacial bonding between the two layers and helping to ensure the integrity of the product structure. At the same time, when the liquid soaks in or the ambient humidity changes, the active ingredients of the extract can be slowly released from the pores of the non-woven fabric, working together with the modified bamboo fiber to continuously exert antibacterial effects. Detailed Implementation

[0021] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0022] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0023] It should be understood that, except in any operational instance or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term "about". Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximations varying with the desired performance to be obtained according to the invention.

[0024] Bamboo fiber, bamboo virgin fiber, purchased from Suzhou Lifeng Textile Co., Ltd., with an average linear density of 7.33 dtex.

[0025] Polydopamine, Q-0174208, purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0026] The herbal extract solution is a mixture of Artemisia argyi extract, Phellodendron chinense extract, Centella asiatica extract and ethanol in a mass ratio of 2:1:0.5:20. Artemisia argyi extract was purchased from Shaanxi Longbeiyuan Bioengineering Co., Ltd. Phellodendron bark extract was purchased from Xi'an Yuankui Biotechnology Co., Ltd. Centella asiatica extract, purchased from Shanxi Lisheng Biotechnology Co., Ltd.

[0027] Chitosan, C105799, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0028] PP nonwoven fabric, with a basis weight of 60g / m² 2 Purchased from Shaanxi Wanlong Nonwoven Fabric Co., Ltd.

[0029] The soft layer is made of pure cotton nonwoven fabric, 2585121, purchased from Zhejiang Furuisen Spunlace Nonwoven Fabric Co., Ltd., with a basis weight of 130g / m². 2 .

[0030] The absorbent layer is made of Suyu brand superabsorbent polymer (SAP), CAS: 9003-04-7, purchased from Beijing Jinqiao Chemical Co., Ltd.

[0031] The bottom layer material is PE film, purchased from Suzhou Wobed Cleanroom Materials Co., Ltd., with a basis weight of 40g / m³. 2 .

[0032] The parameters of the hydroentanglement are: 3 hydroentanglements, with the first hydroentanglement pressure at 3 MPa and the last hydroentanglement pressure at 5 MPa.

[0033] The hot pressing parameters are 100℃, 1MPa pressure, and 2s time.

[0034] Example 1 An antibacterial sanitary napkin containing traditional Chinese medicine, wherein the structure of the antibacterial sanitary napkin containing traditional Chinese medicine comprises, in sequence, a soft layer, a modified bamboo fiber layer, a traditional Chinese medicine extract layer, an absorbent layer, and a bottom layer; The preparation method of the above-mentioned antibacterial sanitary napkin containing traditional Chinese medicine includes the following steps: S1.1. The pH of deionized water was adjusted to 2.5 using a 50wt% sulfuric acid solution, then mixed with bamboo fiber, ultrasonically treated for 5 min, then NaIO4 was added, heated to 40℃ and reacted in the dark for 4 h, the solvent was removed, and after washing and drying, oxidized bamboo fiber was obtained. The mass ratio of the deionized water, bamboo fiber, and NaIO4 is 65:1:3. S1.2. Chitosan was added to an 18.2% (V / V) glacial acetic acid solution, and then oxidized bamboo fiber was added and mixed. The mixture was reacted at 20°C for 6 hours. Then polydopamine and glutaraldehyde were added and the mixture was reacted at 25°C for 10 hours. The solvent was removed, the mixture was washed, and dried to obtain modified bamboo fiber. The mass ratio of chitosan, oxidized bamboo fiber, glacial acetic acid solution, polydopamine, and glutaraldehyde is 0.8:4:60:2:0.1. S2. Take modified bamboo fiber, open, comb, and lay it into a web to form a bamboo fiber web with an areal density of 30 g / m². 2 Hydroentangling reinforcement and drying yield a modified bamboo fiber layer; S3. Soak the PP non-woven fabric in the Chinese herbal extract solution for 1 hour, then remove and dry it to obtain the Chinese herbal extract layer. S4. Stack the layers in the following order from top to bottom: soft layer, modified bamboo fiber layer, traditional Chinese medicine extract layer, absorbent layer, and bottom layer. Press them together with hot press to form a base layer. Cover the back of the bottom layer with release paper, cut and package to obtain an antibacterial sanitary napkin containing traditional Chinese medicine.

[0035] Example 2 An antibacterial sanitary napkin containing traditional Chinese medicine, wherein the structure of the antibacterial sanitary napkin containing traditional Chinese medicine comprises, in sequence, a soft layer, a modified bamboo fiber layer, a traditional Chinese medicine extract layer, an absorbent layer, and a bottom layer; The preparation method of the above-mentioned antibacterial sanitary napkin containing traditional Chinese medicine includes the following steps: S1.1. The pH of deionized water was adjusted to 2.5 using a 50wt% sulfuric acid solution, then mixed with bamboo fiber, ultrasonically treated for 5 min, then NaIO4 was added, heated to 40℃ and reacted in the dark for 4 h, the solvent was removed, and after washing and drying, oxidized bamboo fiber was obtained. The mass ratio of the deionized water, bamboo fiber, and NaIO4 is 65:1:3. S1.2. Chitosan was added to an 18.2% (V / V) glacial acetic acid solution, and then oxidized bamboo fiber was added and mixed. The mixture was reacted at 25°C for 6 hours. Then polydopamine and glutaraldehyde were added and the mixture was reacted at 30°C for 8 hours. The solvent was removed, the mixture was washed, and dried to obtain modified bamboo fiber. The mass ratio of chitosan, oxidized bamboo fiber, glacial acetic acid solution, polydopamine, and glutaraldehyde is 0.8:5:60:2:0.1. S2. Take modified bamboo fiber, open, comb, and lay it into a web to form a bamboo fiber web with an areal density of 30 g / m². 2 Hydroentangling reinforcement and drying yield a modified bamboo fiber layer; S3. Soak the PP non-woven fabric in the Chinese herbal extract solution for 1.5 hours, take it out and dry it to obtain the Chinese herbal extract layer; S4. Stack the layers in the following order from top to bottom: soft layer, modified bamboo fiber layer, traditional Chinese medicine extract layer, absorbent layer, and bottom layer. Press them together with hot press to form a base layer. Cover the back of the bottom layer with release paper, cut and package to obtain an antibacterial sanitary napkin containing traditional Chinese medicine.

[0036] Example 3 An antibacterial sanitary napkin containing traditional Chinese medicine, wherein the structure of the antibacterial sanitary napkin containing traditional Chinese medicine comprises, in sequence, a soft layer, a modified bamboo fiber layer, a traditional Chinese medicine extract layer, an absorbent layer, and a bottom layer; The preparation method of the above-mentioned antibacterial sanitary napkin containing traditional Chinese medicine includes the following steps: S1.1. The pH of deionized water was adjusted to 2.5 using a 50wt% sulfuric acid solution, then mixed with bamboo fiber, ultrasonically treated for 5 min, then NaIO4 was added, heated to 40℃ and reacted in the dark for 4 h, the solvent was removed, and after washing and drying, oxidized bamboo fiber was obtained. The mass ratio of the deionized water, bamboo fiber, and NaIO4 is 65:1:3. S1.2. Chitosan was added to an 18.2% (V / V) glacial acetic acid solution, and then oxidized bamboo fiber was added and mixed. The mixture was reacted at 25°C for 6 hours. Then polydopamine and glutaraldehyde were added and reacted at 25°C for 10 hours. The solvent was removed, the mixture was washed, and dried to obtain modified bamboo fiber. The mass ratio of chitosan, oxidized bamboo fiber, glacial acetic acid solution, polydopamine, and glutaraldehyde is 1:6:60:2:0.1. S2. Take modified bamboo fiber, open, comb, and lay it into a web to form a bamboo fiber web with an areal density of 30 g / m². 2 Hydroentangling reinforcement and drying yield a modified bamboo fiber layer; S3. Soak the PP non-woven fabric in the Chinese herbal extract solution for 2 hours, then remove and dry it to obtain the Chinese herbal extract layer. S4. Stack the layers in the following order from top to bottom: soft layer, modified bamboo fiber layer, traditional Chinese medicine extract layer, absorbent layer, and bottom layer. Press them together with hot press to form a base layer. Cover the back of the bottom layer with release paper, cut and package to obtain an antibacterial sanitary napkin containing traditional Chinese medicine.

[0037] Comparative Example 1 An antibacterial sanitary napkin containing traditional Chinese medicine ingredients. The difference between this comparative example and Example 1 is that in step S1.2, polydopamine is replaced with an equal mass of chitosan; the other components and preparation methods are the same.

[0038] Comparative Example 2 An antibacterial sanitary napkin containing traditional Chinese medicine ingredients. The difference between this comparative example and Example 1 is that in step S1.2, chitosan is replaced with an equal mass of polydopamine; the other components and preparation methods are the same.

[0039] Test Example 1 The performance of antibacterial sanitary napkins containing traditional Chinese medicine prepared in Examples 1-3 and Comparative Examples 1-2 was tested.

[0040] Absorption performance: Refer to standard GB / T 30133-2013 to test the reabsorption amount of the examples and comparative examples. Replace the test solution used in the experiment with anticoagulated pig blood. Cut the examples and comparative examples into samples with a size of 100mm×100mm. Test each sample 5 times and take the average value.

[0041] Antibacterial properties: The antibacterial properties against Escherichia coli were tested according to GB / T 20944.3-2008.

[0042] Air permeability: The air permeability was tested in accordance with GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics".

[0043] The test results are shown in Table 1.

[0044] Table 1. Performance test results of antibacterial sanitary napkins containing traditional Chinese medicine prepared in Examples 1-3 and Comparative Examples 1-2. Table 1 shows that the antibacterial sanitary napkins prepared in Examples 1-3 all exhibit excellent overall performance. They have excellent dryness-keeping ability and a high antibacterial rate, effectively killing Escherichia coli; in addition, the products have excellent breathability, with an average breathability exceeding 5350 mm / s, ensuring comfortable use.

[0045] In contrast, both comparative studies modified the modified bamboo fiber layer, and all properties showed varying degrees of decline.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An antibacterial sanitary napkin containing traditional Chinese medicinal herbs, characterized in that, The structure of the antibacterial sanitary napkin containing traditional Chinese medicine includes, in sequence, a soft layer, a modified bamboo fiber layer, a traditional Chinese medicine extract layer, an absorbent layer, and a bottom layer; The modified bamboo fiber is obtained by reacting the reaction product of oxidized bamboo fiber and chitosan with polydopamine.

2. The antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 1, characterized in that, The material of the soft layer is pure cotton nonwoven fabric.

3. The antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 1, characterized in that, The material of the absorbent layer is selected from one or more of sodium polyacrylate and acrylic-acrylamide copolymer.

4. The antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 1, characterized in that, The underlying material is a PE film.

5. The antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 1, characterized in that, The herbal extracts are selected from one or more of Artemisia argyi extract, Phellodendron chinense extract, Centella asiatica extract, and Galla chinensis extract.

6. The antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 1, characterized in that, The viscosity of the chitosan is 100-200 mPa·s.

7. The method for preparing an antibacterial sanitary napkin containing traditional Chinese medicinal materials according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Chitosan and oxidized bamboo fiber are mixed and reacted. Then polydopamine and glutaraldehyde are added and reacted to obtain modified bamboo fiber. S2. The modified bamboo fiber is prepared into a bamboo fiber mesh, and then hydroentangled to obtain a modified bamboo fiber layer. S3. Soak the non-woven fabric in the Chinese herbal extract to obtain the Chinese herbal extract layer; S4. The soft layer, modified bamboo fiber layer, traditional Chinese medicine extract layer, absorbent layer, and bottom layer are combined into one piece to obtain an antibacterial sanitary napkin containing traditional Chinese medicine.

8. The method for preparing the antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 7, characterized in that, In step S1, the mass ratio of chitosan to oxidized bamboo fiber is 0.5-1:4-6.

9. The method for preparing the antibacterial sanitary napkin containing traditional Chinese medicinal materials according to claim 7, characterized in that, In step S1, the reaction temperature is 20-30℃.

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