Antibacterial, deodorizing, and breathable bottom film for hygiene products and its preparation method, as well as disposable hygiene products

Abstract

This invention discloses an antibacterial, deodorizing, and breathable bottom membrane for hygiene products, its preparation method, and disposable hygiene products. The method includes the following steps: using an activated modified porous material as a filler; compounding the filler, antibacterial agent, polyolefin resin, and processing aids to prepare a modified composite material masterbatch; and preparing a breathable membrane using the modified composite material masterbatch. This invention uses porous materials instead of traditional calcium carbonate, which are lightweight and have multiple breathable channels, thus improving air permeability. The porous material is modified with deodorizing functional groups to eliminate various odors; surface activation treatment technology imparts good dispersibility and hydrophobicity to the porous particles; the addition of antibacterial agents inhibits bacterial growth during use, further improving the deodorizing effect. This invention is a polyethylene breathable membrane that integrates lightweight, high air permeability, and antibacterial and deodorizing functions.

Description

Technical Field

[0001] This invention relates to an antibacterial, deodorizing, and breathable bottom film for hygiene products, its preparation method, and disposable hygiene products. Background Technology

[0002] After urine is excreted from the human body, its nitrogen, phosphorus, and pH levels undergo significant changes. In fresh urine, nitrogen is primarily present as urea. During storage, urea undergoes hydrolysis, producing ammonia, a substance with a pungent odor, which escapes from the urine, resulting in nitrogen loss. Therefore, ammonia nitrogen remains the predominant form of nitrogen in urine. In addition, some small molecule compounds, such as mercapto (-SH), amino (-NH2), and aldehyde (-CHO) groups, are highly volatile at room temperature and produce unpleasant odors in the air.

[0003] Currently, most commercially available polyethylene breathable membranes use calcium carbonate as a filler. This involves adding approximately 50% calcium carbonate to a polyolefin resin carrier, blending it, extruding it into a film, and then stretching it at a certain ratio to form the breathable membrane. However, calcium carbonate powder has a high density, increasing the mass of the polyethylene breathable membrane and resulting in a higher specific gravity. Furthermore, breathable membranes using calcium carbonate powder as a filler have low air permeability and cannot provide antibacterial or deodorizing effects. In summary, polyethylene breathable membranes suffer from bottleneck problems such as high filler density, low air permeability, and lack of deodorizing function.

[0004] Porous materials are often used as adsorbents for treating organic waste gases due to their abundant pore structure, large specific surface area, and good chemical stability. However, they generally suffer from low adsorption efficiency and long adsorption time during the adsorption process, and may also absorb moisture during storage, transportation, and use. Summary of the Invention

[0005] To overcome the above-mentioned defects, the purpose of this invention is to provide a method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products.

[0006] To achieve the above objectives, the present invention provides a method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products, comprising the following steps:

[0007] Preparation of deodorizing porous materials and multi-antibacterial porous materials;

[0008] The deodorizing porous material and the antibacterial porous material were activated separately.

[0009] An antibacterial porous material and / or a deodorizing porous material of the first diameter are mixed into the first resin raw material as the first filler to form the first film layer raw material.

[0010] The second diameter deodorizing porous material and / or antibacterial porous material are mixed into the second resin raw material as the second filler to serve as the second film layer raw material.

[0011] The third filler of the third diameter is mixed into the third resin raw material as the raw material for the third film layer.

[0012] The first film layer material, the second film layer material, and the third film layer material are fed into a co-extrusion device to produce a three-layer co-extruded film comprising a first film layer, a second film layer, and a third film layer;

[0013] The above three co-extruded films are stretched to form an antibacterial, deodorizing, and breathable bottom film;

[0014] in,

[0015] First diameter > Second diameter > Third diameter;

[0016] In co-extruded films, the thickness of the first film layer > the thickness of the second film layer > the thickness of the third film layer;

[0017] The weight ratio of the first filler to the first resin raw material in the first film layer raw material is 1.5-2.5:1;

[0018] The weight ratio of the second filler to the second resin in the second film layer raw material is 1-2:1;

[0019] The weight ratio of the third filler to the third resin in the third film layer raw material is 0.8-1:1.

[0020] Furthermore, the porous material is zeolite, silica, molecular sieve, or activated carbon.

[0021] Furthermore, the deodorizing porous material includes: loading deodorizing metal ions onto the porous material.

[0022] Furthermore, in the co-extruded film, the thickness of the first film layer is 50%; the thickness of the second film layer is 30%; and the thickness of the third film layer is 20%.

[0023] Furthermore, in the co-extruded film, the diameter of the porous material in the first film layer is 3-10 μm; the diameter of the porous material in the second film layer is 1.5-5 μm; and the diameter of the porous material in the third film layer is 1-2.5 μm.

[0024] Furthermore, the first film layer, the second film layer, and the third film layer of the co-extruded film contain antibacterial agents.

[0025] To achieve the above objectives, the antibacterial, deodorizing, and breathable bottom film of the present invention is made by three-layer co-extrusion and stretching of a first film layer, a second film layer, and a third film layer;

[0026] The first thin film layer is provided with an antibacterial porous material and / or a deodorizing porous material of a first diameter;

[0027] The second film layer is provided with a deodorizing porous material and / or an antibacterial porous material of a second diameter;

[0028] The third film layer material contains a third filler with a third diameter;

[0029] in,

[0030] First diameter > Second diameter > Third diameter;

[0031] In co-extruded films, the thickness of the first film layer > the thickness of the second film layer > the thickness of the third film layer;

[0032] The weight ratio of the first filler to the first resin raw material in the first film layer raw material is 1.5-2.5:1;

[0033] The weight ratio of the second filler to the second resin in the second film layer raw material is 1-2:1;

[0034] The weight ratio of the third filler to the third resin in the third film layer raw material is 0.8-1:1.

[0035] This invention uses a porous material to replace traditional calcium carbonate, which is lightweight and has many breathable channels, thus improving air permeability. The porous material is modified with deodorizing functional groups to eliminate various odors; surface activation treatment gives the porous particles good dispersibility and hydrophobicity; the addition of antibacterial agents inhibits bacterial growth during use, further improving the deodorizing effect. In summary, this invention is a lightweight, highly breathable, antibacterial, and deodorizing breathable bottom membrane for hygiene products. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the preparation method of the antibacterial, deodorizing, and breathable membrane of the present invention.

[0037] Figure 2 This is a comparison diagram of monofilament + yarn versus monofilament and yarn as the support layer in this invention. Detailed Implementation

[0038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Adsorption has proven to be an effective method for removing pollutants from water, addressing the unpleasant odor produced by urine in the air. It offers advantages such as simple operation and low investment, making it the most widely used water purification method. Adsorption also demonstrates significant effectiveness in treating urine wastewater, and related research and applications are increasing. Due to the rich composition of substances in urine, the adsorption process involves a combination of physical and chemical adsorption, influenced by factors such as functional group interactions, ion exchange adsorption, and complexation precipitation. Porous materials such as zeolite, activated carbon, silica, and molecular sieves are often used as adsorbents for wastewater treatment due to their abundant pore structure, large specific surface area, and good chemical stability. However, zeolite and activated carbon are considered better choices due to cost considerations.

[0043] Example 1

[0044] The method for preparing the antibacterial, deodorizing, and breathable bottom film of the sanitary products of the present invention includes the following steps:

[0045] Preparation of deodorizing porous materials and antibacterial porous materials;

[0046] The deodorizing porous material and the antibacterial porous material were activated separately.

[0047] An antibacterial porous material and / or a deodorizing porous material of the first diameter are mixed into the first resin raw material as the first filler material to serve as the first film layer raw material; the diameter of the first filler porous material is 3-10 μm.

[0048] A second diameter deodorizing porous material and / or antibacterial porous material are mixed into the second resin raw material as a second filler to serve as the raw material for the second film layer; the diameter of the porous material is 1.5-5 μm.

[0049] A third filler with a third diameter is mixed into a third resin raw material to serve as the raw material for the third thin film layer; the diameter of the porous material is 1-2.5 μm.

[0050] The first film layer material, the second film layer material, and the third film layer material are fed into a co-extrusion device to produce a three-layer co-extruded film comprising a first film layer, a second film layer, and a third film layer;

[0051] The above three co-extruded films are stretched to form an antibacterial, deodorizing, and breathable bottom film;

[0052] in,

[0053] First diameter > Second diameter > Third diameter;

[0054] In co-extruded films, the thickness of the first film layer > the thickness of the second film layer > the thickness of the third film layer;

[0055] The weight ratio of the first filler to the first resin raw material in the first film layer raw material is 1.5-2.5:1;

[0056] The weight ratio of the second filler to the second resin in the second film layer raw material is 1-2:1;

[0057] The weight ratio of the third filler to the third resin in the third film layer raw material is 0.8-1:1.

[0058] As can be seen from the above, in the three thin films

[0059] Deodorization and adsorption capacity: ① > ② > ③

[0060] Particle size and dosage: ① > ② > ③

[0061] Layer thickness: ①-50% > ②-30% > ③-20%

[0062] Antibacterial agent dosage: ① > ② > ③

[0063] Leakage resistance: ① < ② < ③

[0064] In this way, after the film is stretched, the porous materials in ① and ②, due to their larger particle size, are easily exposed and come into contact with the odor source, thus easily achieving the purpose of deodorization and antibacterial.

[0065] This invention aims to use activated modified porous materials to replace traditional calcium carbonate in the preparation of breathable membranes, which are lightweight and have many breathable channels, thus improving air permeability.

[0066] Deodorization modification of porous materials (average particle size 1-5 μm) includes:

[0067] 1) Ionic liquid / acidification modification (containing acidic components such as amino acids, sulfonic acid, carboxylic acid, and sulfuric acid)

[0068] 2) Metal ion supported (Fe, Mn, Zn, Cu, Ag, Na, etc.)

[0069] For example, the impregnation method is used to load metal ions onto zeolite materials. The impregnation method involves immersing a solid powder or a pre-formed solid (carrier or catalyst containing the host) of a specific shape and size in a solution of a soluble compound containing active components (main and co-catalyst components). After contact for a certain period, the residual liquid is separated, and the active components adhere to the solid in the form of ions or compounds. This method is mainly used to prepare Fe, Mn, Cu, Ag, Ce, Al, La, Zn, and Na-loaded zeolites. The main steps are impregnation-drying-calcination. Among these, Fe, Mn, and Na-loaded zeolites show better adsorption effects for ammonia nitrogen, exhibiting ion exchange activity.

[0070] For example, the sol-gel method can be used to load metal ions onto zeolite materials. The sol-gel method uses compounds containing highly chemically active components as precursors. These raw materials are uniformly mixed in the liquid phase and undergo hydrolysis and condensation reactions to form a stable, transparent sol system in solution. The sol then ages and slowly polymerizes between the particles, forming a three-dimensional network structure called a gel. The spaces between the gel networks are filled with solvent that has lost its flowability, thus forming a gel. This method is mainly used to prepare Ti-loaded zeolites, using natural zeolites. For example, antibacterial porous materials can also be prepared by loading silver, zinc, or nano-silver into porous materials using the sol-gel method.

[0071] 3) Add 1-5 parts of deodorizing agent: such as acidic materials, zinc ricinoleate, plant extracts, etc.

[0072] Plant extracts contain many bioactive components, including flavonoids, phenolic acids, and alkaloids. The ortho- and meta-position active phenolic hydroxyl groups can undergo condensation and complexation reactions with the -SH and -NH2 groups of ammonia and hydrogen sulfide gases. Therefore, plant extracts containing flavonoids and phenolic hydroxyl groups have certain deodorizing properties against ammonia and hydrogen sulfide gases.

[0073] Lemon extract – active ingredients include: polyphenols, phenolic glycosides, alkaloids, etc.

[0074] Tea extracts – active ingredients include: polyphenols, catechins, etc.

[0075] Eucalyptus oil – active ingredients include polyphenols and catechins.

[0076] The activation treatment of porous materials in this invention can be carried out by various methods, including metal loading modification, metal oxide modification of compounds, surface modification, surfactant modification, acidification modification, adsorbent composite modification, ultrasonic / microwave modification, etc.

[0077] Examples of deodorization and activation using porous materials:

[0078] Step ① Powder Modification: Impregnate 100 parts of silica in 150 parts of a 10wt% dilute hydrochloric acid solution of 2-amino-3-p-hydroxyphenylpropionic acid, mix and stir for 30 minutes, then filter and wash with deionized water. Add 10 parts of Zn(NO3)·6H2O, stir for 10 minutes, and then filter. Add an appropriate amount of 10 parts of AgNO3, filter, and dry at 110℃ for 12 hours, controlling the moisture content to below 600ppm. Remove, grind, sieve, classify, and store in sealed bags for later use.

[0079] Step ② Antibacterial and Surface Activation: Add 100 parts of the powder from Step ① to a high-speed mixer with heating function, stir, and when the temperature reaches 85℃, add 1 part benzalkonium chloride and 1 part polyhexamethylene biguanide, and stir at high speed for 2 minutes. Then add 2% stearic acid for activation treatment, so that the activation degree is greater than 95%.

[0080] Another example of deodorization and activation of porous materials: Step ① Powder modification: 100 parts of zeolite were impregnated in 120 parts of 8wt% α-imino aqueous solution, mixed and stirred for 20 minutes and then filtered. 6 parts of Fe(SO4)·7H2O were added and stirred for 10 minutes and then filtered. 2 parts of diecryldimethyl chloride and 6 parts of MnSO4 were added and filtered. The mixture was then dried at 110℃ for 12 hours, with the moisture content controlled below 600ppm. The mixture was then ground, sieved and graded, and sealed in bags for later use.

[0081] Step ② Antibacterial and Surface Activation: Add 100 parts of the powder from Step ① to a high-speed mixer with heating function, stir, and when the temperature reaches 85℃, add 1 part benzalkonium chloride and 1 part polyhexamethylene biguanide, and stir at high speed for 2 minutes. Then add an appropriate amount of stearic acid for activation treatment, so that the activation degree is greater than 95%.

[0082] Example 2

[0083] Figure 1 This is a flowchart illustrating another embodiment of the preparation method of the antibacterial, deodorizing, and breathable membrane of the present invention. As shown in the figure, activated modified porous material is used as a filler; deodorizing filler, antibacterial filler, antibacterial agent, polyolefin resin, and processing aids are compounded to prepare a modified composite material masterbatch; then, the modified composite material masterbatch is used to prepare an antibacterial, deodorizing, and breathable bottom membrane.

[0084] The above-mentioned antibacterial agents can be selected as needed, including: inorganic antibacterial agents such as silver ions, copper ions, zinc ions, and metal oxides; organic antibacterial agents such as guanidines and quaternary ammonium salts; natural antibacterial agents and compound antibacterial agents, etc. (heat resistance, effectiveness, and safety need to be considered).

[0085] In summary, this invention uses porous materials to replace traditional calcium carbonate, which are lightweight and have multiple air channels, thus improving air permeability. The porous materials are modified with deodorizing functional groups to eliminate various odors; surface activation treatment gives the porous particles good dispersibility and hydrophobicity; and the addition of antibacterial agents inhibits bacterial growth during use, further improving the deodorizing effect. This results in a lightweight polyethylene breathable membrane that combines high air permeability with antibacterial and deodorizing functions.

[0086] Example 3

[0087] A disposable hygiene product includes a top layer, an absorbent core, and a breathable bottom membrane; the breathable bottom membrane is the same as the one described in the above embodiment.

[0088] Example 4

[0089] Based on the above embodiment 3, the absorption core is a multi-layer structure absorption core.

[0090] The multi-layer absorbent core includes an upper spacer fabric absorbent layer and a lower reservoir layer composed of highly absorbent resin and non-woven material.

[0091] The absorbent layer of the spacer fabric is composed of upper textile yarns, lower textile yarns, and support textile yarns.

[0092] The upper textile yarn is polyester yarn. In order to improve the liquid wetting effect, the polyester yarn is treated with sodium hydroxide to open some of the ester bonds in the polyester to achieve a hydrophilic effect. Its moisture regain is controlled at 0.4% to 2.0%.

[0093] The lower layer of textile yarn is polyester, viscose, cotton, or a combination thereof, and its moisture regain is controlled at ≥3%.

[0094] The support layer textile yarn is polyester yarn or a combination of polyester yarn and polyester monofilament. In order to improve the liquid wetting effect, it is hydrophilic after being modified with polyether, epoxy polyether or amino polyether, and its moisture regain is controlled at 0.8% to 4.0%.

[0095] The aforementioned textile yarns are yarns with a diameter of 35-500um; each yarn consists of 7-30 fibers, each fiber being approximately 5-35um.

[0096] Anticoagulant, hydrophilic additives and PET chips are mixed, melt co-extruded by twin-screw extruder, water cooled, pelletized and dried to obtain hydrophilic anticoagulant PET masterbatch, which is then spun to prepare polyester yarn.

[0097] The anticoagulant is sodium citrate or disodium EDTA, and the dosage is generally 1%-5% of the total weight.

[0098] Moisture regain: Upper layer textile yarn < Support layer textile yarn < Lower layer textile yarn;

[0099] The diameter of a single polyester fiber is: the diameter of the supporting layer textile fiber is less than that of the upper layer textile fiber; this ensures that the liquid seeps downwards while minimizing the diffusion of the liquid in the upper layer.

[0100] The supporting layer of polyester single fibers is an irregularly shaped fiber, such as cross-shaped, Y-shaped, T-shaped or W-shaped, with grooves on the fiber surface to prevent the capillary channels between fibers from being blocked by coagulated blood, thus losing the capillary effect and preventing blood from penetrating downwards. This results in repeated use, where the liquid spreads in the upper layer, affecting dryness.

[0101] The synergistic effect of anticoagulant masterbatch and grooved irregular fibers slows down capillary blockage caused by blood coagulation on the fiber surface.

[0102] Furthermore, the support layer can be a composition of polyester yarn and polyester monofilament, with the ratio of polyester monofilament fineness to polyester yarn fineness being 0.5 to 2:1, for example, 0.5:1, 1:1, 1.5:1, or 2:1. The polyester monofilaments and polyester yarn are arranged at regular intervals, with the polyester monofilaments providing a supportive elastic structure and the polyester yarn promoting liquid penetration.

[0103] The reservoir has a four-layer structure: the first layer is a non-woven material; the second layer is a highly absorbent resin prepared by a low-temperature synthesis method of prior polymerization and cross-linking, which has a rough surface and constructs multiple blood flow channels to prevent hemoglobin blockage; the third layer is a highly absorbent resin prepared by a high-temperature synthesis method of prior neutralization and cross-linking, which has high absorption capacity; and the fourth layer is a non-woven material.

[0104] According to GB / T 10807-2006 "Determination of Hardness of Flexible Foam Polymer Materials (Indentation Method)", the flat compression performance of the spacer fabric was tested to characterize its elasticity. The monofilament + yarn solution significantly increased stress compared to using only yarn, approaching the performance of using monofilament as a support layer, effectively improving the material's elasticity. See Figure 2 .

[0105] Test Method (1):

[0106] 1. Adjust the temperature of the pig's blood to 23±1℃;

[0107] 2. Lay the sanitary napkin flat on the table, measure the longitudinal center as the dispensing point, and mark it.

[0108] 3. Use a pipette to add 5ml of pig blood to the liquid addition point, and start timing the time required for the pig blood to be completely absorbed on the surface (i.e., absorption time in seconds);

[0109] 4. After 5 minutes, cover the liquid addition point with a known weight of filter paper (110 mm in diameter) and place a 2.5 kg block (110 mm in diameter) on top. After 2 minutes, weigh the filter paper W2 and calculate the increase in weight of the filter paper (i.e., the amount of backflow W).

[0110] 5. Repeat step 3 after 1 minute, repeating twice, for a total of 3 additions.

[0111]

[0112] Test Method (II)

[0113] 1. Adjust the temperature of the pig's blood to 23±1℃;

[0114] 2. Lay the sanitary napkin flat on the table, measure the longitudinal center as the dispensing point, and mark it.

[0115] 3. Use a pipette to add 5ml of pig blood to the liquid addition point, and start timing the time required for the pig blood to be completely absorbed on the surface (i.e., absorption time in seconds);

[0116] 4. After 5 minutes, cover the liquid addition point with a known weight of filter paper (110 mm in diameter) and place a 2.5 kg block (110 mm in diameter) on top. After 2 minutes, weigh the filter paper W2 and calculate the increase in weight of the filter paper (i.e., the amount of backflow W).

[0117] 5. After 30 minutes (to allow the blood to clot), repeat step 3 again, repeating twice, for a total of 3 additions.

[0118] Study the effects of different yarn treatment methods on absorption and rewetting.

[0119]

[0120] Study on the effects of different SAP combinations on absorption and re-osmosis

[0121]

[0122]

[0123] Example 5

[0124] Based on the above embodiments, the liquid storage layer has a five-layer structure: the first layer is a non-woven material, the second layer is a plant-based composite core, the third layer is a non-woven material, the fourth layer is a highly absorbent resin prepared by a low-temperature synthesis method after polymerization and cross-linking, which has a rough surface, constructs multiple blood flow channels, and prevents hemoglobin blockage, and the fifth layer is a non-woven material.

[0125] The plant-based absorbent core consists of three layers: the upper and lower layers are composite non-woven absorbent covering layers made of seaweed fiber and acidic wood ash; the middle absorbent layer is a liquid storage layer composed of acidic wood ash absorbent material and fluffy cotton. The preparation method of the plant-based composite core includes the following steps:

[0126] 1) Preparation of acidic wood ash; The method for preparing acidic wood ash includes: dissolving wood ash powder in hydrochloric acid solution, with a hydrochloric acid content of 1%-10% and a mass ratio of hydrochloric acid to wood ash of 10:1, to achieve an acid-base neutralization reaction and adjust the acidity or alkalinity of the wood ash; stirring the reaction with a stirrer for 1-2 hours; drying at a temperature controlled at 40-50℃; and sieving through a 120-mesh sieve to obtain acidic wood ash particles;

[0127] 2) Preparation of modified seaweed fiber; The preparation method of the modified seaweed fiber includes: using seaweed fiber as a substrate and deionized aqueous solution as a solvent; dispersing the seaweed fiber in a pulping machine, adding acidic wood ash, and stirring at high speed and low temperature with a content of 0.1-1% and a temperature of 30-40℃ for 3-6 minutes to fully mix the seaweed fiber and wood ash.

[0128] After the seaweed fiber was rapidly stirred and dispersed, it was mixed with acidic wood ash. Under acidic conditions, the eggshell structure of the seaweed fiber was destroyed, and the crystalline region was disrupted. At the same time, the calcium alginate in the seaweed fiber and the wood ash contained a variety of trace elements. Among them, potassium ions and sodium ions underwent an exchange reaction to form calcium alginate / potassium and calcium alginate / sodium hydrogel fibers, which promoted slight swelling of the fibers, reduced cross-linking points, weakened the interaction force, enhanced the water-accessible area, and improved hygroscopicity and tensile strength.

[0129] 3) Preparation of composite nonwoven fabric; The preparation method of composite nonwoven fabric includes the following steps: laying modified seaweed fiber into a web; spreading acidic wood ash between two layers of seaweed fiber web; combining the two fiber webs after spreading acidic wood ash, using gelled seaweed fiber to coat and bond the acidic wood ash, using needle punching process to slowly reinforce, pressing into sheets, dehydrating and drying, finishing and shaping to make composite nonwoven fabric;

[0130] The nonwoven fabric made of seaweed fiber and wood ash has increased absorption capacity. After absorbing moisture, water molecules and fiber molecules form a three-dimensional network structure through hydrogen bonding, thus transforming into a gel and enhancing the tensile strength of the nonwoven fabric in a wet state. The wood ash particles improve the clogging of the seaweed fiber moisture-absorbing paste gel. After the seaweed fiber absorbs blood quickly, it gels and becomes more skin-friendly and conforms better to the body. The wood ash absorbs blood and seeps downward, improving backflow and enhancing dryness.

[0131] 4) Preparation of plant-based liquid reservoir layer; The plant-based liquid reservoir layer is composed of acidic wood ash and fluffy cotton as a fixing layer; The fluffy cotton is divided into multiple layers; Acidic wood ash is spread on each layer of fluffy cotton;

[0132] Wood ash is the ash powder produced by burning various medicinal plants. It contains the most potassium, followed by phosphorus, and also trace elements such as calcium, magnesium, silicon, iron, and zinc. It has mild properties, dispels cold and reduces swelling, and has antibacterial and bacteriostatic effects, which can effectively promote women's health.

[0133] Using acidic wood ash as the absorbent substrate, absorbent materials are prepared by distributing acidic wood ash in different proportions on fluffy non-woven fabric to replace water-absorbing resin. While ensuring absorption performance, the dryness and humidity can be adjusted to reduce dampness, while also increasing natural antibacterial, cold-dispelling, swelling-reducing, and odor-removing effects.

[0134] The fixed layer of fluffy cotton is a three-dimensional mesh structure with many pores. Acidic wood ash is distributed and spread in different proportions and positions on the top layer of fluffy cotton in a candy-like spreading pattern with a ratio of 3:1. The middle layer of acidic wood ash is concentrated and spread from the center to both sides. At the same time, the fluffy cotton in the middle position is made into a cone-shaped opening pattern, and the wood ash layer is spread in the lower middle to prepare an absorbent layer.

[0135] 5) A layer of composite nonwoven fabric is placed on the top and bottom of the prepared liquid storage layer to cover the liquid storage layer.

[0136] During the core composite process, the upper and lower layers of seaweed composite nonwoven fabric are wrapped around the middle absorbent layer. At the same time, under the alkaline conditions of wood ash, the seaweed fibers and cotton fibers exhibit gelation properties. Wood ash is used as an adhesive to bond the wrapping layer and the absorbent layer, thus preparing the composite core.

[0137] A plant-based composite core is made using seaweed fiber and natural plant materials such as wood ash as the base material, ensuring that the materials are natural, safe, and biodegradable. The various trace elements in wood ash can gel with seaweed fiber to prepare the upper and lower base fabrics. At the same time, wood ash is used to regulate the dryness and moisture, improve the backflow of the base fabric, and enhance dryness. Fluffy cotton and wood ash are used as the absorbent layer. Wood ash, as a plant ash powder, can adjust the dryness and moisture while ensuring absorption performance, reducing dampness, and adding natural antibacterial, cold-dispelling, swelling-reducing, and odor-removing effects. The prepared composite core is not easy to break or delaminate, and it also adds antibacterial and odor-removing functions, reducing the occurrence of inflammation.

[0138] Example 6

[0139] Based on the above embodiment 3, the surface layer is a nonwoven fabric reinforced with a double-layer fiber web; wherein...

[0140] The upper fiber web is a bicomponent fiber with a core-sheath structure, consisting of a PBAT sheath and a PLA core, with a denier of 0.6D to 1.5D. The PBAT sheath provides a soft touch, while the PLA core provides good rigidity. Alternatively, the upper fiber web can be a bicomponent fiber with a PBS sheath and a PLA core, also with a denier of 0.6D to 1.5D. The PBS sheath provides a soft touch, while the PLA core provides good rigidity.

[0141] The lower fiber web is composed of a sheath-core structure of high and low melting point fibers, consisting of a sheath layer of low melting point PLA (melting point 127℃~133℃) and a core layer of high melting point PLA (160℃~180℃), with a fiber denier of 1.5D~6.0D.

[0142] The core-sheath structure of the upper fiber web consists of two types of bicomponent fibers: hydrophobic and hydrophilic fibers. These two types of fibers are uniformly mixed and combed, with a hydrophobic fiber:hydrophilic fiber ratio of 1:0.2–5; for example: 1:0.4; 1:0.5; 1:0.7; 1:0.9; 1:1.5; 1:2; 1:2.5; 1:3; 1:4; 1:5, etc. The hydrophilic and hydrophobic fibers surround and separate each other, blocking the diffusion of liquid in the upper fiber web while ensuring its wetting.

[0143] The core-sheath structure of the lower fiber web consists of high- and low-melting-point fibers composed of eccentric fibers and hollow fibers, which are uniformly mixed and combed. The eccentric fibers form a three-dimensional natural crimp, which helps provide the product's three-dimensional thickness and reduces moisture reabsorption. The hollow fibers are hygroscopic, lightweight, and soft, which is beneficial for liquid conduction. The ratio of eccentric fiber to hollow fiber is 1:0.5–2. For example: 1:0.4; 1:0.5; 1:0.7; 1:0.9; 1:1.5; 1:2; 1:2.5; 1:3; 1:4; 1:5, etc.

[0144] The contact angle θ1 between the droplet on the surface energy wettability of the upper fiber web and the solid surface, and the equivalent radius r1 of the voids between the fibers; the contact angle θ2 between the droplet on the surface energy wettability of the lower fiber web and the solid surface, and the equivalent radius r2 of the voids between the fibers, satisfy θ2 < θ

[0145] 1 < 90° and cosθ1 / r1 < cosθ2 / r2. During the production process, by controlling the hydrophilicity of the fiber finish, such as the EO number of polyethylene oxide ether in the finish, the regulation of the contact angle θ between the droplet and the solid surface is achieved; by adjusting the process and fiber fineness during fiber carding, the equivalent radius r of the voids between the fibers is controlled.

[0146] The fiber randomness of the upper fiber web > the fiber randomness of the lower fiber web, and hot air penetrates and reinforces the double-layer fiber web from the lower fiber web to the upper fiber web. The lower fiber web has low fiber randomness, which improves the longitudinal liquid diversion; the upper fiber web has high fiber randomness, which reduces the difference in longitudinal and transverse strength of the upper fiber web and improves the wear resistance of the upper layer (not easy to fluff, soft).

[0147] As a further improvement of the present invention, TiO2 is added to PBAT or PBS, and tributyl acetyl citrate, TiO2 and PBAT or PBS are extruded and pelletized by a screw extruder to prepare PBAT or PBS filled with TiO2. Due to the different refractive indices of TiO2 and the resin to light, it has the effect of whitening the fibers, and uses the principle of color overlay to achieve the fading of red or dark red menstrual blood.

[0148] The present invention utilizes the characteristics of softness, rigidity and melting point of PBAT (PBS), high and low melting point PLA fibers to prepare a unidirectional diversion biodegradable hot air non-woven fabric composed of an upper soft fine denier fiber web and a lower rigid coarse denier fiber web. The relationship between the surface energy and capillary performance of the upper and lower layer fibers is constructed to achieve rapid liquid infiltration, and combined with a three-dimensional fluffy structure composed of eccentric fibers and hollow fibers in the lower layer to prevent liquid rewetting. At the same time, the technologies of blocking liquid diffusion in the upper fiber web and fading the fiber color are adopted to make the prepared non-woven fabric have the characteristics of softness, small surface layer diffusion, menstrual blood shielding, rapid liquid infiltration and low rewetting.

[0149] According to "GB / T 24218.2-2009 Textiles - Test methods for non-woven fabrics - Part 2: Determination of thickness", "GB / T 24218.13-2010 Textiles - Test methods for non-woven fabrics - Part 13: Determination of liquid multiple penetration time", "GB / T 24218.14-2010 Textiles - Test methods for non-woven fabrics - Part 14: Determination of rewetting amount of covering materials", a 30 gsm non-woven fabric (both the upper and lower fiber webs are 15 gsm) is tested to characterize its bulkiness, liquid penetration time and rewetting amount.

[0150]

[0151] Using 30gsm nonwoven fabric (both upper and lower fiber webs are 15gsm) as the surface layer material of the sanitary napkin, the performance of the sanitary napkin was tested according to the following method:

[0152] 1. Adjust the temperature of the pig's blood to 23±1℃;

[0153] 2. Lay the sanitary napkin flat on the table, measure the longitudinal center as the dispensing point, and mark it.

[0154] 3. Use a pipette to add 5ml of pig blood to the liquid addition point, and start timing the time required for the pig blood to be completely absorbed on the surface (i.e., absorption time in seconds);

[0155] 4. After 5 minutes, cover the liquid addition point with a known weight of filter paper (110 mm in diameter) and place a 2.5 kg block (110 mm in diameter) on top. After 2 minutes, weigh the filter paper W2 and calculate the increase in weight of the filter paper (i.e., the amount of backflow W).

[0156] 5. Repeat step 3 after 1 minute, repeating twice, for a total of 3 additions;

[0157] 6. Test the diffusion length between the surface layer and the core, and observe the color of the surface layer.

[0158]

[0159] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0160] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0161] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products, characterized in that, The method includes the following steps: Preparation of deodorizing porous materials and antibacterial porous materials; The deodorizing porous material and the antibacterial porous material were activated separately. An antibacterial porous material and / or a deodorizing porous material of the first diameter are mixed into the first resin raw material as the first filler to form the first film layer raw material. The second diameter deodorizing porous material and / or antibacterial porous material are mixed into the second resin raw material as the second filler to serve as the second film layer raw material. The third filler of the third diameter is mixed into the third resin raw material as the raw material for the third film layer. The first film layer material, the second film layer material, and the third film layer material are fed into a co-extrusion device to produce a three-layer co-extruded film comprising a first film layer, a second film layer, and a third film layer; The above three co-extruded films are stretched to form an antibacterial, deodorizing, and breathable bottom film; in, First diameter > Second diameter > Third diameter; In co-extruded films, the thickness of the first film layer > the thickness of the second film layer > the thickness of the third film layer; The weight ratio of the first filler to the first resin raw material in the first film layer raw material is 1.5-2.5:1; The weight ratio of the second filler to the second resin in the second film layer raw material is 1-2:1; The weight ratio of the third filler to the third resin in the third film layer raw material is 0.8-1:

1.

2. The method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products as described in claim 1, characterized in that, The porous material is zeolite, silica, molecular sieve, or activated carbon.

3. The method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products as described in claim 1, characterized in that, The deodorizing porous material includes: loading deodorizing metal ions onto the porous material.

4. The method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products as described in claim 1, characterized in that, The co-extruded film has a first film layer with a thickness of 50%, a second film layer with a thickness of 30%, and a third film layer with a thickness of 20%.

5. The method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products as described in claim 1, characterized in that, The diameter of the porous material in the first film layer of the co-extruded film is 3-10 μm; the diameter of the porous material in the second film layer is 1.5-5 μm; and the diameter of the porous material in the third film layer is 1-2.5 μm.

6. The method for preparing an antibacterial, deodorizing, and breathable bottom film for hygiene products as described in claim 1, characterized in that, The co-extruded film contains antibacterial agents in the first film layer, the second film layer, and the third film layer.

7. A sanitary product with an antibacterial, deodorizing, and breathable bottom film, characterized in that, The antibacterial, deodorizing, and breathable bottom membrane is made by co-extrusion and stretching of a first film layer, a second film layer, and a third film layer. The first thin film layer is provided with an antibacterial porous material and / or a deodorizing porous material of a first diameter; The second film layer is provided with a deodorizing porous material and / or an antibacterial porous material of a second diameter; The third film layer material contains a third filler with a third diameter; in, An antibacterial porous material and / or a deodorizing porous material of the first diameter are mixed into the first resin raw material as the first filler to form the first film layer raw material. The second diameter deodorizing porous material and / or antibacterial porous material are mixed into the second resin raw material as the second filler to serve as the second film layer raw material. The third filler of the third diameter is mixed into the third resin raw material as the raw material for the third film layer. First diameter > Second diameter > Third diameter; In co-extruded films, the thickness of the first film layer > the thickness of the second film layer > the thickness of the third film layer; The weight ratio of the first filler to the first resin raw material in the first film layer raw material is 1.5-2.5:1; The weight ratio of the second filler to the second resin in the second film layer raw material is 1-2:1; The weight ratio of the third filler to the third resin in the third film layer raw material is 0.8-1:

1.

8. A disposable hygiene product, characterized in that, It includes a surface layer, an absorbent core, and a breathable bottom membrane; the breathable bottom membrane is the antibacterial and deodorizing breathable bottom membrane as described in claim 7.

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