Macroporous super-breathable, dry and comfortable hygienic product and preparation process thereof

Abstract

The invention relates to the field of hygienic products, and discloses a macroporous super-breathable, dry and comfortable hygienic product and a preparation process thereof, and the macroporous super-breathable, dry and comfortable hygienic product comprises a macroporous non-gel composite non-woven fabric, a nano platinum antibacterial layer, intelligent super absorbent resin and a softened surface layer. A macroporous structure is introduced into the surface of the non-woven fabric, so that the absorption speed of liquid and the air circulation are obviously improved; the nano platinum antibacterial layer endows the product with efficient antibacterial performance, effectively inhibits the growth of bacteria, and improves the hygienic guarantee of a user; the intelligent SAP automatically adjusts the water absorption capacity according to the environment humidity, rapidly expands under the high-humidity condition, improves the water absorption efficiency, locks the liquid and prevents the liquid from permeating back; the surface layer subjected to softening treatment further improves the comfort and the skin-friendly property of the product, and skin friction is reduced. The product is suitable for baby diapers, female sanitary napkins and adult incontinence nursing products, excellent air permeability, dry and comfortable performance and antibacterial performance are provided, and the comfortable experience of a user is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, in particular to a macroporous, super-breathable, dry and refreshing sanitary product and a preparation process thereof. Background Art

[0002] In the current field of sanitary products, such as diapers, sanitary napkins and adult incontinence care products, the water absorption and dryness of the products directly affect the comfort and health of the users. However, the non-woven fabrics used in most existing sanitary products have a dense surface structure. Although they have a certain water absorption capacity, due to the low surface porosity, the liquid penetration rate is slow, and the liquid stays on the surface for a long time, causing the user to easily feel wet and uncomfortable after excreting the liquid. Especially in the case of large excretion volume or long-term wear, the dense structure of the non-woven fabric is difficult to quickly drain the liquid, resulting in the product surface being wet, increasing the risk of skin friction and irritation. Especially for loose stools and menstrual blood, such excrement cannot penetrate the dense structure of the non-woven fabric surface. Even if the existing technology punches holes in the non-woven fabric, due to the small pore size and porosity, loose stools and menstrual blood cannot penetrate the holes, resulting in the product surface being wet, and surface stains contacting the skin, causing discomfort such as skin rashes.

[0003] Furthermore, the existing non-porous nonwoven fabric design results in poor breathability, making it difficult for water vapor to escape quickly. This stuffy environment not only affects comfort but also increases the likelihood of bacterial growth, posing a health hazard. While some products have improved their absorbency through surface treatments, they have not yet found a good balance between rapid liquid transfer and breathability. Optimizing surface structure design to improve liquid absorption speed, breathability, and dryness remains a major technical challenge. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a macroporous, super-breathable, dry sanitary product and its preparation process, which solves the problems of slow liquid penetration, poor air permeability and insufficient dryness in existing sanitary products due to the dense surface structure.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A macroporous, ultra-breathable, dry and sanitary product, comprising:

[0006] Macroporous glue-free composite non-woven fabric, the non-woven fabric is made of polypropylene or polyester fibers with a diameter of 5-20 μm, or bicomponent fibers, and is formed by hot pressing or mechanical punching to form a macroporous structure with a pore size greater than or equal to 2 mm and a porosity of 30%-70%;

[0007] A nanofiber reinforcement layer covering the macroporous non-woven fabric, wherein the fiber diameter of the nanofiber layer is 50-100nm, and the fiber surface is treated with an antibacterial layer using nano-platinum technology, which effectively inhibits the growth of bacteria. The concentration of this treatment is 0.1-5%;

[0008] The absorbent core includes an intelligent super absorbent resin and a conventional super absorbent resin, which are mixed in a ratio of 20-30:70-80. The intelligent super absorbent resin can expand under conditions of 60%-90% humidity to increase its absorption capacity by 50%-100%, and shrink when the humidity decreases.

[0009] Preferably, the macroporous glue-free composite non-woven fabric is prepared by hot air laying molding or spunbond meltblown process, and glue-free lamination is achieved by physical compounding.

[0010] Preferably, the antibacterial layer treated with nano-platinum is attached to the surface of the nanofiber non-woven fabric by deposition or impregnation, and the temperature is controlled at 50-120° C. for 0.2-5 seconds.

[0011] Preferably, the absorbent core layer has a thickness of 1-3 mm and is composited with the macroporous non-woven fabric by a hot pressing process, with a hot pressing temperature of 80-120° C., a pressure of 1-2 MPa, and a pressing time of 5-8 seconds.

[0012] Preferably, the surface of the macroporous adhesive-free composite non-woven fabric is softened and coated with silicone oil with a silicone oil concentration of 0.1%-0.5%, a coating temperature of 60-100° C., and a coating time of 0.2-5 seconds.

[0013] The present invention also provides a preparation process for macroporous, ultra-breathable, dry and sanitary products, comprising the following steps:

[0014] Polypropylene or polyester fiber or bicomponent fiber with a fiber diameter of 5-20 μm is used to form a non-woven fabric structure through hot air laying or spunbond meltblown process, and then hot pressing or mechanical punching is used to form macropores with a pore size of greater than or equal to 2 mm and a porosity of 30%-70%;

[0015] Through the fiber refinement process, a nanofiber layer is formed on the surface of the non-woven fabric, and an antibacterial layer treated with nano-platinum is attached to the fiber surface by an impregnation method or a deposition method, with the concentration of the antibacterial layer being 0.1%-5%;

[0016] The intelligent super absorbent resin and the conventional super absorbent resin are mixed in a ratio of 20-30:70-80 to form an absorbent core layer with a thickness of 2-3 mm;

[0017] The macroporous non-woven fabric, nanofiber layer and absorbent core layer are compounded by hot pressing or gluing process, the hot pressing temperature is 80-120℃, the pressure is 1-2MPa, and the pressing or gluing time is 0.2-5 seconds;

[0018] The surface of the macroporous non-woven fabric is softened and coated with silicone oil at a coating temperature of 60-100° C. for a coating time of 0.2-5 seconds.

[0019] Preferably, the fiber thinning process is an electrospinning process, the spinning voltage is 10-20 kV, the fiber diameter is controlled at 50-100 nm, the electrospinning jet distance is 10-15 cm, and the spinning speed is 0.5-1 m / min.

[0020] Preferably, the temperature of the hot pressing molding is 100-150° C., and the hot pressing time is 0.2-5 seconds to ensure the stability of the macroporous structure.

[0021] Preferably, the silicone oil concentration of the silicone oil softening treatment is 0.1%-0.5%, and the coating time is 0.2-5 seconds, ensuring that the surface of the non-woven fabric is soft and skin-friendly.

[0022] The present invention also provides the use of the macroporous, super-breathable, dry and clean sanitary products in baby diapers, female sanitary napkins or adult incontinence care products.

[0023] The present invention provides a macroporous, ultra-breathable, dry and sanitary product and its preparation process.

[0024] Beneficial effects:

[0025] 1. This invention significantly accelerates liquid conduction by designing a macroporous structure within the adhesive-free composite nonwoven fabric, allowing liquid to quickly penetrate through the surface layer into the absorbent core. This design significantly increases the absorption rate of sanitary products, prevents liquid from stagnating on the surface, and improves product dryness, especially under high excretion conditions.

[0026] 2. The introduction of the macroporous structure in this invention not only accelerates liquid penetration but also improves air circulation, ensuring that the product maintains good surface permeability while absorbing liquid. Compared with traditional non-porous nonwoven fabrics, the water vapor transmission rate is significantly improved, reducing the feeling of stuffiness during use and enhancing user comfort, making it particularly suitable for long-term wear scenarios.

[0027] 3. The present invention imparts potent antimicrobial properties through the application of a nano-platinum-treated antimicrobial layer, effectively inhibiting the growth of common pathogens such as Staphylococcus aureus and Escherichia coli. This antimicrobial function not only extends the lifespan of the sanitary product but also significantly reduces the risk of skin infections, making it particularly suitable for infants, women, and incontinent adults.

[0028] 4. The introduction of the intelligent superabsorbent resin in this invention enables the product to automatically adjust its water absorption capacity according to ambient humidity. In high humidity environments, the intelligent SAP rapidly expands, increasing water absorption efficiency. When humidity decreases, the material automatically contracts to prevent excessive water absorption. This dynamic adjustment capability significantly improves the product's water absorption performance and provides a long-lasting dry feeling, making it particularly suitable for nighttime or prolonged use.

[0029] 5. This invention uses a glue-free lamination process for macroporous materials, avoiding the chemical residues that may exist in traditional adhesives, ensuring the environmental friendliness and safety of the product. The glue-free composite nonwoven fabric not only reduces the use of chemical ingredients, but also improves the physical strength of the material, ensuring the product has a long service life while maintaining efficient absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural hierarchy diagram of the sanitary product of the present invention;

[0031] Figure 2 It is a schematic diagram of the preparation process of the present invention.

[0032] Among them, 1. Macroporous glue-free composite non-woven fabric; 2. Nanofiber reinforcement layer; 3. Absorbent core layer; 4. Bottom waterproof and breathable layer. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Please see the attached Figure 1 -Attached Figure 2 The present invention relates to a macroporous, ultra-breathable, dry hygiene product, particularly suitable for baby diapers, sanitary napkins, and adult incontinence care products. This product utilizes a combination of a macroporous, adhesive-free composite nonwoven fabric, a nanofiber reinforcement layer, and an intelligent, highly absorbent material to deliver ultra-fast absorption, excellent dryness, and good breathability.

[0035] Hygiene product structural design

[0036] like Figure 1 As shown, the sanitary product of the present invention includes the following structural levels:

[0037] (1) Macroporous glue-free composite non-woven fabric

[0038] This nonwoven fabric is made from polypropylene (PP), polyester (PET), or bicomponent fibers with a fiber diameter of 5-20 μm. The nonwoven fabric substrate is formed through hot air laying or spunbond meltblown processes. The adhesive-free lamination process ensures a physical bond between the nonwoven layer and other materials, eliminating the use of chemical adhesives and improving environmental friendliness and skin safety.

[0039] The surface layer of the nonwoven fabric is formed through hot pressing or mechanical perforation to create a macroporous structure with a pore size of 2mm or greater, and a porosity of 30%-70%. This design ensures that liquids can quickly penetrate the surface layer and enter the absorbent layer. The specific hot pressing process is set at a temperature of 100-150°C, a pressure of 1-2 MPa, and a pressing time of 0.2-5 seconds.

[0040] (2) Nanofiber reinforcement layer

[0041] A nanofiber reinforcement layer with a diameter of 50-100 nm is deposited on the surface of the macroporous nonwoven fabric through a fiber refinement process. This layer provides faster liquid absorption capacity through high porosity and large surface area, while also improving the overall strength and water absorption speed of the sanitary product.

[0042] To further enhance antimicrobial properties, an antimicrobial layer treated with nano-platinum is introduced into the nanofiber layer through a deposition or impregnation method. The particle size of the antimicrobial layer is controlled at 20-50nm, and the concentration is 0.1%-5%. The antimicrobial layer, through the use of citric acid molecules and other agents, has a strong antibacterial effect in the environment, inhibiting the growth of common pathogens such as Escherichia coli and Staphylococcus aureus, while maintaining a clean surface.

[0043] (3) Absorbent core layer

[0044] The absorbent core layer comprises both Smart Superabsorbent Polymer (Smart SAP) and conventional Superabsorbent Polymer (SAP). Smart SAP adjusts its absorption properties based on changes in ambient humidity. Within a humidity range of 60%-90%, Smart SAP expands by 50%-100%, rapidly absorbing liquids in high-humidity conditions. It then contracts as humidity decreases, reducing surface wetness. Conventional SAP maintains basic absorbency.

[0045] Smart SAP and conventional SAP are mixed in a ratio of 20-30:70-80. The thickness of the absorbent core layer is controlled at 1-3mm. It is compounded with the macroporous non-woven fabric and nanofiber layer through a hot pressing process. The hot pressing temperature during the compounding process is 80-120℃, the pressure is 1-2MPa, and the pressing time is controlled at 0.2-5 seconds to ensure a firm bond between the absorbent core layer and other materials.

[0046] (4) Surface softening treatment

[0047] To enhance surface comfort and softness, the surface of the macroporous, glue-free composite non-woven fabric is softened. Silicone oil (concentration 0.1%-0.5%) is applied, with the coating temperature controlled at 60-100°C and the coating time at 0.2-5 seconds. The silicone oil forms a smooth coating on the surface of the non-woven fabric fibers, reducing friction between the material and the skin. This makes it particularly suitable for prolonged use and significantly improves user comfort.

[0048] (5) Bottom waterproof and breathable layer

[0049] The bottom layer of sanitary products is a waterproof and breathable membrane, usually made of polyethylene (PE) or polypropylene (PP), which ensures that liquids will not leak out while maintaining good breathability to avoid stuffiness. The thickness of the bottom layer material is generally 20-30μm, and the air permeability is controlled at 500-1500g / m 2 / 24h water vapor transmission rate range.

[0050] like Figure 2 As shown, the sanitary product preparation process includes the following steps:

[0051] (1) Preparation of macroporous glue-free composite nonwoven fabric

[0052] Select polypropylene or polyester fibers with a diameter of 5-10 μm and use air laying or melt blowing technology to form non-woven fabrics. The density of the fabric is adjusted to 10-30 g / m 2 to ensure lightness and sufficient strength.

[0053] The glue-free lamination process combines the nonwoven fabric layer with other functional layers through physical lamination, eliminating the use of chemical glue. Subsequently, macropores with a diameter of 1-3 mm are formed in the nonwoven fabric through hot pressing or mechanical perforation. The hot pressing process is performed at a temperature of 100-150°C, a pressure of 1-2 MPa, and a pressing time of 5-10 seconds, with a porosity controlled at 30%-50%.

[0054] (2) Preparation of nanofiber reinforced layer

[0055] A nanofiber layer is formed on the surface of the macroporous nonwoven fabric through a fiber thinning process. This fiber thinning process preferably employs an electrospinning process, with a spinning solution concentration of 5%-10%, an electrospinning voltage of 10-20 kV, a fiber diameter controlled at 50-100 nm, a spinning jet distance of 10-15 cm, and a spinning speed of 0.5-1 m / min. In addition to electrospinning, this fiber thinning process can also be applied to different nanofiber preparation methods (e.g., meltblowing, air-jet spinning, etc.).

[0056] The nano-platinum treated antibacterial layer particles are attached to the fiber surface by deposition or impregnation. The concentration of the antibacterial layer particles is 0.01%-0.05%, the impregnation temperature is 50-70°C, and the impregnation time is 10-15 minutes to ensure the antibacterial effect.

[0057] (3) Preparation of absorbent core layer

[0058] Smart superabsorbent polymer (Smart SAP) is mixed with conventional SAP in a suitable ratio. Smart SAP dynamically adjusts its absorption capacity based on changes in ambient humidity. The ratio of Smart SAP to conventional SAP is 20-30:70-80, ensuring rapid expansion and effective absorption of liquids in high humidity conditions.

[0059] The thickness of the absorption core layer is 2-3mm. The absorption core layer is compounded with the macroporous non-woven fabric and the nanofiber layer through a hot pressing process. The hot pressing temperature is 80-120℃, the pressure is 1-2MPa, and the pressing time is 5-8 seconds to ensure close bonding between the layers.

[0060] (4) Surface softening treatment

[0061] The macroporous non-woven fabric is softened with silicone oil at a concentration of 0.1%-0.5%. The silicone oil is evenly applied to the surface of the non-woven fabric through an impregnation process at a temperature of 60-80°C for 10-20 seconds to improve surface softness and reduce friction on the skin.

[0062] (5) Preparation of waterproof and breathable layer

[0063] The bottom waterproof breathable membrane is made by co-extrusion blown film process. The material is polyethylene (PE) or polypropylene (PP). The thickness of the membrane is 20-30μm, ensuring sufficient air permeability without liquid penetration. The air permeability is controlled at 500-1500g / m 2 / 24h, ensuring that air circulation is maintained during long-term use to avoid stuffiness.

[0064] The sanitary products of this invention achieve rapid liquid conduction through a macroporous nonwoven fabric design, and the nanofiber reinforcement layer enhances liquid diffusion and absorption. The intelligent superabsorbent material dynamically adjusts its absorption capacity based on ambient humidity, ensuring a consistently dry surface. The silicone oil softening treatment enhances the material's comfort and skin-friendliness, making the product more effective in applications such as baby diapers, feminine sanitary napkins, and adult incontinence care products, providing a better user experience and improved health.

[0065] In order to better understand the present invention, the above method is described in detail below with reference to specific examples.

[0066] Example 1: Large-pore, ultra-breathable, dry and sanitary products for baby diapers

[0067] This embodiment is specially designed for baby diapers, and achieves quick drying and long-term breathable care effects for baby skin by using large-pore glue-free composite non-woven fabric, nanofiber reinforcement layer and intelligent water-absorbing core layer.

[0068] Surface material: Macroporous non-adhesive composite non-woven fabric, made of polypropylene fiber with a diameter of 7μm, a pore size of 2mm, and a porosity of 40%. The large pores are formed through heat pressing technology to enhance the rapid penetration of urine.

[0069] Nanofiber layer: A nanofiber layer with a diameter of 80nm is deposited on the surface of the macroporous non-woven fabric, and the concentration of antibacterial particles in the layer is 0.5%. The antibacterial function ensures that the diaper remains clean during long-term wear, reducing the risk of skin infection.

[0070] Absorbent core layer: Smart SAP and conventional SAP are mixed in a ratio of 25:75. The core layer thickness is 2mm. Smart SAP can expand when the humidity is 70%, and the absorption increases by 70%, effectively preventing urine back-seepage and keeping the surface dry.

[0071] Softening treatment: The surface is softened with silicone oil with a concentration of 0.2%, ensuring the softness and comfort of the diaper when in contact with baby's skin.

[0072] Example 2: Macroporous, ultra-breathable, dry sanitary product for women's sanitary napkins

[0073] This embodiment is applied to female sanitary napkins, and by combining the macroporous non-woven fabric with the intelligent water-absorbing core layer, the requirements of dryness, breathability and prevention of back-seepage during menstrual care are met.

[0074] Surface material: Macroporous glue-free composite non-woven fabric, using two-component ES fiber with a diameter of 16μm, a pore size of 3.5mm, and a porosity of 50%. The surface hole design allows menstrual blood to quickly penetrate into the absorption layer.

[0075] Nanofiber layer: The diameter of the nanofiber is 90nm, and the antibacterial layer particle concentration is 2%, ensuring that the sanitary napkin maintains its antibacterial effect and reduces odor during multiple uses.

[0076] Absorbent core layer: Smart SAP and conventional SAP are mixed in a ratio of 20:80. The core layer thickness is 1mm. Smart SAP expands when the humidity is 80%, improving the absorption capacity and preventing surface moisture.

[0077] Softening treatment: The surface of the sanitary napkin is softened with silicone oil at a concentration of 0.3%, ensuring more comfortable contact with the skin and reducing friction discomfort during menstruation.

[0078] Example 3: Macroporous, ultra-breathable, dry and comfortable sanitary products for adult incontinence care products

[0079] This embodiment is mainly used in adult incontinence care products. By combining a high-efficiency water-absorbing material with a breathable and waterproof layer, it provides dryness, breathability, and leak-proof functions during long-term use.

[0080] Surface material: Macroporous glue-free composite non-woven fabric, made of polypropylene fiber with a diameter of 9μm, a pore size of 5mm, a porosity of 45%, and a macroporous design that can quickly absorb urine.

[0081] Nanofiber layer: The diameter of the nanofiber is 60nm and the concentration of antibacterial particles is 4%, which enhances the antibacterial effect and is particularly suitable for incontinence care needs during long-term use.

[0082] Absorbent core layer: Smart SAP and regular SAP are mixed in a ratio of 30:70, with a core layer thickness of 3mm. Smart SAP expands when the humidity is 90%, and the absorption capacity increases by 100%, making it suitable for nighttime use or high incontinence users, keeping the surface dry for a long time.

[0083] Softening treatment: The surface of the care product has been softened with silicone oil with a concentration of 0.5% to ensure comfort when wearing and prevent skin discomfort caused by long-term friction.

[0084] Example 4: Macroporous ultra-breathable, dry sanitary products for lightweight feminine pads

[0085] This embodiment is directed to lightweight feminine pads, focusing on breathability, lightness, and comfort, providing high-quality absorption and dryness experience for daily use.

[0086] Surface material: macroporous glue-free composite non-woven fabric, using two-component ES fiber with a diameter of 12μm, a pore size of 3mm, and a porosity of 30%, ensuring that the pad can quickly absorb light excretion and keep the surface dry.

[0087] Nanofiber layer: The diameter of the nanofiber is 70nm, and the antibacterial layer concentration is 1%. The low-concentration antibacterial layer ensures cleanliness during daily use and prevents bacterial growth.

[0088] Absorbent core layer: Smart SAP and conventional SAP are mixed in a ratio of 20:80. The thickness of the absorbent core layer is 1.2mm, ensuring that light excrement is quickly absorbed. Smart SAP expands when the humidity is 60%, keeping the pad dry.

[0089] Softening treatment: The surface is softened with silicone oil with a concentration of 0.1%, ensuring comfort and lightness in daily use.

[0090] Example 5: Macroporous, ultra-breathable, dry and sanitary products for medical nursing pads

[0091] This embodiment is suitable for medical nursing pads that require higher absorption speed and antibacterial properties, and is particularly suitable for providing continuous dryness and breathability during surgery or long-term bed rest care.

[0092] Surface material: macroporous glue-free composite non-woven fabric, made of polypropylene fiber with a diameter of 8μm, a pore size of 3mm, and a porosity of 50%. The macroporous design ensures that the liquid can be quickly absorbed and avoids backflow.

[0093] Nanofiber layer: The diameter of the nanofiber is 100nm, and the particle concentration of the antibacterial layer is 5%. The high concentration of the antibacterial layer ensures that the nursing pad avoids bacterial cross infection during use and is suitable for postoperative care or long-term bedridden care patients.

[0094] Absorbent core layer: Smart SAP and regular SAP are mixed in a ratio of 30:70. The absorbent core layer is 3mm thick, ensuring rapid absorption when a large amount of body fluid is lost and providing 100% absorption capacity in high humidity environments.

[0095] Softening treatment: The surface has been softened with silicone oil with a concentration of 0.4%. The nursing pad is soft and skin-friendly, suitable for long-term bedridden patients to avoid pressure sores caused by skin friction.

[0096] Comparative Example 1: Using traditional non-porous non-woven fabric

[0097] Compared with Example 1, the difference is that a conventional non-porous non-woven fabric is used instead of a macroporous non-adhesive composite non-woven fabric. The non-woven fabric is made of polypropylene (PP) fibers with a diameter of 7 μm, but the macropores are not formed by hot pressing or punching, and the surface has a dense structure.

[0098] Comparative Example 2: No antibacterial layer

[0099] Compared with Example 1, the difference is that the nanofiber reinforcement layer is removed or does not contain antibacterial particles. The fiber diameter of the nanofiber layer is still 80nm, but no antibacterial particles are added.

[0100] Comparative Example 3: Using only conventional super absorbent resin (SAP)

[0101] The difference compared with Example 1 is that only conventional SAP is used, and intelligent SAP is not used.

[0102] Comparative Example 4: No softening treatment

[0103] Compared with Example 1, the difference is that the macroporous adhesive-free composite non-woven fabric is not subjected to silicone oil softening treatment.

[0104] Comparative experiment 1: water absorption speed comparison experiment

[0105] By comparing the water absorption speed of the present invention with that of comparative examples 1-4, the improvement effect of the macroporous glue-free composite non-woven fabric, the nano-platinum treated antibacterial layer, the intelligent super absorbent resin (SAP) and the softening treatment on the liquid absorption speed of the present invention was verified.

[0106] In each experiment, 10 mL of simulated urine (normal saline) was dripped onto the sample surface at the same rate, and a stopwatch was used to record the time it took for the liquid to be completely absorbed by the sample. Each experiment was repeated three times, and the average value was used for comparison.

[0107] Example 1: Macroporous glue-free composite non-woven fabric + antibacterial layer treated with nano-platinum + intelligent SAP + softening treatment.

[0108] Comparative Example 1: Traditional non-porous non-woven fabric.

[0109] Comparative Example 2: Antibacterial layer without nano-platinum treatment.

[0110] Comparative Example 3: Only conventional super absorbent resin (SAP) was used.

[0111] Comparative Example 4: No softening treatment was performed.

[0112] The experimental results are shown in the following table:

[0113]

[0114]

[0115] From the data in the above table, we can get:

[0116] Example 1 has the fastest water absorption speed, with an average absorption time of 5.63 seconds, showing the synergistic effect of the macroporous non-woven fabric, the antibacterial layer treated with nano-platinum, the smart SAP and the softening treatment.

[0117] Comparative Example 1 uses a traditional non-porous non-woven fabric, which has a longer absorption time, averaging 12.27 seconds. Due to the limitation of the non-porous structure of the surface, it is difficult for the liquid to quickly penetrate into the absorbent core layer, showing the disadvantage of slow water absorption.

[0118] Comparative Example 2 (without the nano-platinum antibacterial layer) absorbed water slightly longer, about 6.33 seconds, than Example 1. Although the absorption rate was still relatively fast, the absence of the nano-platinum antibacterial layer reduced the permeability of the fiber structure.

[0119] Comparative Example 3 uses only conventional SAP, and the water absorption time is 8.93 seconds. Conventional SAP's water absorption capacity is not as good as that of smart SAP in a high-humidity environment, with a slower absorption speed and poor liquid penetration and water retention performance.

[0120] The absorption time of Comparative Example 4 (without softening treatment) is 6.10 seconds. Although the macroporous structure accelerates water absorption, the lack of surface softening treatment may result in a water absorption effect that is inferior to that of Example 1.

[0121] The macroporous, adhesive-free composite nonwoven fabric has the following advantages: The macroporous design in Example 1 significantly increases the liquid conduction rate, allowing liquid to quickly pass through the nonwoven fabric and enter the absorbent core layer. However, the non-porous nonwoven fabric in Comparative Example 1 has a dense surface that is difficult for liquid to penetrate, resulting in a slow water absorption rate.

[0122] The role of the nano-platinum-treated antibacterial layer: The antibacterial layer, formed by electrospinning nanofibers, not only has antibacterial properties but also provides higher porosity, helping to accelerate liquid conduction. In Comparative Example 2, removing the antibacterial layer slightly decreased the water absorption rate, indicating that the presence of the nanofiber layer significantly accelerated liquid penetration.

[0123] Function of Smart SAP: Smart SAP can automatically expand and improve water absorption capacity in high humidity environments, which makes the water absorption speed of Example 1 better than that of Comparative Example 3. Conventional SAP has limited water absorption performance in high humidity, resulting in low water absorption efficiency.

[0124] The effect of softening treatment: Softening treatment not only improves skin contact comfort but also optimizes liquid absorption distribution, making the water absorption process more efficient. Although Comparative Example 4 maintains a relatively fast water absorption rate, due to the relatively rough surface, liquid may stay in certain areas for a longer time, reducing the overall water absorption efficiency.

[0125] Experimental data clearly demonstrates the significant advantages of this invention over traditional designs in terms of water absorption speed. Each innovative component contributes to the invention's superior performance over the comparative product in terms of liquid absorption, dryness retention, breathability, and comfort. In particular, the combination of the macroporous structure and intelligent SAP significantly shortens liquid penetration time, resulting in outstanding performance in terms of water absorption speed and user experience.

[0126] Comparative experiment 2: air permeability comparison experiment

[0127] By comparing the air permeability of the present invention with that of Comparative Examples 1-4, we demonstrate the effectiveness of the present invention's macroporous, adhesive-free composite nonwoven fabric, nano-platinum-treated antibacterial layer, intelligent superabsorbent resin (SAP), and softening treatment in improving air permeability. Air permeability is particularly important in sanitary products, directly impacting product comfort and the user's skin health.

[0128] The water vapor transmission rate tester is used to test the air permeability of the sample. Each sample is placed in the tester to measure the amount of water vapor passing through the material. The water vapor transmission rate in the experiment represents the amount of water vapor that passes through per square meter of material in 24 hours, expressed in g / m 2Each group of samples was tested 3 times and the average value was taken for comparison.

[0129] The experimental results are shown in the following table:

[0130]

[0131] From the data in the above table, we can get:

[0132] The average water vapor transmission rate of Example 1 is 1497.0 g / m 2 / 24h, with the highest air permeability among all samples, indicating that the synergistic effect of macroporous glue-free composite non-woven fabric, antibacterial layer and smart SAP is significant in improving air permeability.

[0133] The air permeability of Comparative Example 1 (traditional non-porous non-woven fabric) is the lowest, with an average of 860.0 g / m 2 / 24h. The dense non-porous structure hinders the conduction of water vapor, resulting in poor breathability and easily causing stuffiness.

[0134] Comparative Example 2 removed the antibacterial layer, and the air permeability was slightly lower than that of Example 1, with an average of 1376.7 g / m 2 / 24h, indicating that the antibacterial layer not only has antibacterial effect, but also improves the air permeability of the fiber layer.

[0135] The water vapor transmission rate of comparative example 3 (using only conventional SAP) is 1276.7 g / m 2 / 24h, which is lower than that in Example 1. This shows that the smart SAP not only improves the water absorption performance, but also improves the water vapor dissipation efficiency through adaptive expansion according to humidity changes.

[0136] The water vapor permeability of comparative example 4 (without softening treatment) is 1396.7 g / m 2 / 24h, which is slightly lower than that in Example 1, indicating that the softening treatment also has a certain positive effect on the air permeability, and the soft surface increases the space for air circulation.

[0137] The macroporous non-adhesive composite nonwoven fabric has the following advantages: The macroporous structure significantly increases the passage of air and water vapor through the material, improving breathability. The non-porous nonwoven fabric in Comparative Example 1 hinders the flow of water vapor, resulting in a strong feeling of stuffiness.

[0138] The role of the nano-platinum-treated antimicrobial layer: The high porosity of the nanofiber layer not only accelerates liquid conduction but also improves the overall breathability of the material. The nanofiber structure allows water vapor to pass more freely through the fiber layer, while the nano-platinum-treated antimicrobial layer particles ensure both breathability and antimicrobial protection. The test results of Comparative Example 2 demonstrate the importance of the nano-platinum-treated antimicrobial layer in improving breathability.

[0139] Smart SAP not only exhibits excellent performance in liquid absorption, but its humidity-responsive expansion properties also enhance its ability to dissipate water vapor in high-humidity environments. This capability is unattainable with conventional SAP. The test results in Comparative Example 3 demonstrate the unique advantages of Smart SAP.

[0140] The effect of softening treatment: Silicone oil softening treatment not only increases comfort, but also optimizes the water vapor transmission path, making the surface fibers smoother and more breathable. The results of Comparative Example 4 show that the breathability of the material is reduced when no softening treatment is performed.

[0141] The results of the breathability test show that the present invention outperforms the comparative example in all aspects, especially in the design of the macroporous non-woven fabric, the application of the nano-platinum-treated antibacterial layer, and the selection of the intelligent SAP. The combination of the macroporous structure and the intelligent SAP significantly improves the permeability of water vapor, ensuring that users can remain comfortable and dry during long-term use. The nano-platinum-treated antibacterial layer not only provides antibacterial function, but also enhances the overall breathability by increasing the porosity. The softening effect further improves the breathability and comfort of the material, making the present invention provide a comprehensive comfort experience during use.

[0142] Comparative experiment 3: Comparative experiment of water absorption rate and re-infiltration performance

[0143] Comparing the water absorption and rewet performance of the present invention with those of Comparative Examples 1-4 demonstrates the advantages of the present invention's macroporous, adhesive-free composite nonwoven fabric, nano-platinum-treated antibacterial layer, intelligent superabsorbent resin (SAP), and softening treatment in improving water absorption and reducing liquid rewet. Water absorption reflects a material's ability to absorb liquid, while the rewet performance test simulates whether liquid will flow back to the surface under pressurized conditions after absorption.

[0144] 1. Water absorption test:

[0145] Each sample was cut into squares of equal area (10 cm x 10 cm).

[0146] A certain amount of simulated urine (10 mL of normal saline) was dripped onto the surface of the sample. After waiting for 1 minute, the weight change of the sample was measured.

[0147] The water absorption rate is calculated by the weight change after absorption. The water absorption rate formula is:

[0148] Water absorption rate = (weight after absorption - weight before absorption) / weight before absorption

[0149] Each group of samples was repeated 3 times and the average value was taken.

[0150] 2. Re-infiltration performance test:

[0151] After absorbing water, samples of the same area are placed under a pressure device and a pressure of 5 kPa is applied to simulate the pressure of the user's weight on the absorbent material.

[0152] After maintaining the pressure for 30 seconds, remove the pressure device and observe whether there is any liquid backseepage on the surface. Contact the surface with absorbent paper for 1 minute and measure the increase in the weight of the absorbent paper to indicate the amount of backseepage.

[0153] Each group of samples was repeated 3 times and the average value was taken. The experimental results are shown in the following table:

[0154]

[0155] From the data in the above table, we can get:

[0156] 1. Water absorption comparison:

[0157] The average water absorption rate of Example 1 was 9.97 g / g, demonstrating excellent water absorption performance. The combination of the macroporous structure and the smart SAP allows liquid to quickly enter the absorbent core layer, and the smart SAP automatically expands at high humidity, increasing its absorption capacity.

[0158] Comparative Example 1 (conventional non-porous non-woven fabric) has the lowest water absorption rate of 6.10 g / g. This is because the non-porous non-woven fabric cannot effectively guide liquid to penetrate into the absorbent layer, resulting in low absorption efficiency.

[0159] The water absorption rate of Comparative Example 2 (antibacterial layer not treated with nano-platinum) is 8.50 g / g, which is slightly lower than that of Example 1, indicating that the nanofiber reinforcement layer also plays a certain role in improving the water absorption rate and water absorption amount.

[0160] The water absorption rate of Comparative Example 3 (using only conventional SAP) is 7.50 g / g, which is 2.47 g / g lower than that of Example 1. The dynamic water absorption capacity of smart SAP is significantly better than that of conventional SAP, especially in high humidity environments.

[0161] The water absorption rate of comparative example 4 (without softening treatment) is 8.20 g / g. Although the macroporous structure maintains good water absorption capacity, the lack of softening treatment may affect the uniformity of liquid distribution on the surface, slightly reducing the water absorption efficiency.

[0162] 2. Comparison of back infiltration volume:

[0163] Example 1 had the lowest backflow, averaging 0.23 mL. This demonstrates that the present invention not only effectively absorbs liquid but also locks it in, preventing backflow. The intelligent SAP expands after absorption, locking in the liquid, and the structural design of the macroporous, adhesive-free composite nonwoven fabric helps prevent backflow.

[0164] The back-seepage amount of Comparative Example 1 was the highest, reaching 1.20 mL. After absorbing liquid, non-porous non-woven fabrics tend to accumulate liquid on the surface, and the back-seepage phenomenon is serious when pressure is applied.

[0165] The back-seepage amount of Comparative Example 2 was 0.53 mL, and the back-seepage amount was slightly higher due to the lack of the nanofiber layer, indicating that the nanofiber layer not only improved the water absorption capacity but also played a role in preventing liquid backflow.

[0166] The back-seepage amount of Comparative Example 3 was 1.00 mL, which was relatively large. Conventional SAP has limited water retention capacity after absorption, and liquid easily flows back under pressurized conditions.

[0167] The back-seepage amount of Comparative Example 4 was 0.63 mL. Although the macroporous structure accelerated the liquid absorption, the lack of softening treatment on the surface may cause the liquid to be unevenly distributed on the surface, and the back-seepage phenomenon still exists.

[0168] The function of macroporous adhesive-free composite nonwoven fabric: The macroporous structure accelerates liquid penetration into the absorbent core layer, preventing liquid from stagnating on the surface, thereby improving water absorption. Comparative Example 1 has a non-porous surface, resulting in slow liquid absorption and low water absorption. Liquid accumulates on the surface, leading to severe back-seepage.

[0169] The role of the nano-platinum-treated antibacterial layer: The nanofiber layer provides a highly porous structure, which not only improves water absorption efficiency but also reduces surface liquid backflow. In Comparative Example 2, the absence of this layer resulted in decreased water absorption and water retention.

[0170] Smart SAP's function: Smart SAP automatically expands in high humidity, significantly increasing its water absorption capacity. After absorbing liquid, it expands and locks in the liquid, preventing back-seepage. Conventional SAP in Comparative Example 3 exhibited poor water absorption under high humidity conditions, with significant back-seepage.

[0171] The effect of softening treatment: Softening treatment not only improves comfort but also optimizes the uniform distribution of liquid on the nonwoven surface, helping to absorb liquid and prevent back-wetting. The results of Comparative Example 4 show that the sample without softening treatment has a decline in absorption and water retention performance.

[0172] The superiority of the present invention over the comparative example is clearly shown by the water absorption rate and re-seepage performance tests:

[0173] Water absorption performance: The combination of macroporous non-adhesive composite nonwoven fabric and smart SAP makes this invention significantly superior to traditional designs in water absorption efficiency, with a higher water absorption rate. The humidity-responsive expansion property of smart SAP enhances water absorption capacity in high humidity conditions.

[0174] Rewetting performance: Intelligent SAP and macroporous design effectively lock in liquid, reducing rewetting and providing excellent dryness. The nano-platinum antibacterial layer and softening treatment further reduce liquid rewetting and enhance the user's comfort experience.

[0175] The innovative design of the present invention can provide more efficient liquid absorption and a longer-lasting dry feeling in actual use, which is significantly better than traditional designs, especially in preventing backwetting.

[0176] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A macroporous, super breathable, dry and sanitary product, characterized in that: include: A macroporous non-adhesive composite non-woven fabric, wherein the non-woven fabric is made of polypropylene or polyester fibers with a diameter of 5-20 μm, or bicomponent fibers, and is formed by hot pressing or mechanical punching to form a macroporous structure with a pore size greater than or equal to 2 mm and a porosity of 30%-70%; The macroporous non-woven fabric is covered with a nanofiber reinforcement layer, the fiber diameter of the nanofiber layer is 50-100nm, and the fiber surface is treated with an antibacterial layer of nano-platinum technology, which effectively inhibits the growth of bacteria. The concentration of the nano-platinum technology treatment is 0.1-5%; The absorbent core comprises an intelligent super absorbent resin and a conventional super absorbent resin, which are mixed in a ratio of 20-30:70-80. The intelligent super absorbent resin can expand under a humidity of 60%-90% to increase the absorption capacity by 50%-100%, and shrink when the humidity decreases.

2. The macroporous, super breathable, dry and sanitary product according to claim 1, characterized in that: The macroporous non-glue composite non-woven fabric is prepared by hot air web laying or spunbond meltblown process, and is laminated without glue by physical compounding.

3. The macroporous, super breathable, dry and sanitary product according to claim 1, characterized in that: The antibacterial layer treated with nano-platinum is attached to the surface of the nano-fiber non-woven fabric by a deposition or impregnation method, the temperature is controlled at 50-120° C., and the time is 0.2-5 seconds.

4. The macroporous super breathable, dry and clean sanitary product according to claim 1, characterized in that: The absorbent core layer has a thickness of 2-3 mm and is compounded with the macroporous non-woven fabric by a hot pressing or gluing process, the hot pressing temperature is 80-120° C., the pressure is 1-2 MPa, and the pressing or gluing time is 0.2-5 seconds.

5. The macroporous super breathable, dry and sanitary product according to claim 1, characterized in that: The surface of the macroporous non-adhesive composite non-woven fabric is softened and coated with silicone oil, the silicone oil concentration is 0.1%-0.5%, the coating temperature is 60-100° C., and the coating time is 0.2-5 seconds.

6. A process for preparing a macroporous super breathable, dry and clean sanitary product, applied to a macroporous super breathable, dry and clean sanitary product and its preparation process as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Polypropylene or polyester fibers with a fiber diameter of 5-20 μm are used to form a non-woven fabric structure through hot air laying or spunbond meltblown process, and a macroporous structure with a porosity of 30%-70% and a pore size greater than or equal to 2 mm is formed by hot pressing or mechanical punching; Through the fiber refinement process, a nanofiber layer is formed on the surface of the non-woven fabric, and the antibacterial agent treated with nano-platinum is attached to the fiber surface by an impregnation method or a deposition method, and the concentration of the antibacterial liquid is 0.1%-5%; The intelligent super absorbent resin and the conventional super absorbent resin are mixed in a ratio of 20-30:70-80 to form an absorbent core layer with a thickness of 1-3 mm; The macroporous nonwoven fabric, the nanofiber layer and the absorbent core layer are compounded by hot pressing or gluing, the hot pressing temperature is 80-120°C, the pressure is 1-2MPa, and the pressing or gluing time is 0.2-5 seconds; The surface of the macroporous non-woven fabric is softened and coated with silicone oil at a coating temperature of 60-80° C. for a coating time of 0.2-5 seconds.

7. The process for preparing the macroporous super breathable, dry and clean sanitary product according to claim 6, characterized in that: The fiber thinning process is an electrostatic spinning process, the spinning voltage is 10-20 kV, the fiber diameter is controlled at 50-100 nm, the electrostatic spinning jet distance is 10-15 cm, and the spinning speed is 0.5-1 m / min.

8. The process for preparing the macroporous super breathable, dry and sanitary product according to claim 6, characterized in that: The temperature of the hot pressing or gluing molding is 80-120° C., and the hot pressing time is 0.2-5 seconds, so as to ensure the stability of the macroporous structure.

9. The process for preparing the macroporous super breathable, dry and sanitary product according to claim 6, characterized in that: The silicone oil concentration of the silicone oil softening treatment is 0.1%-0.5%, and the coating time is 0.2-5 seconds, ensuring that the surface of the non-woven fabric is soft and skin-friendly.

10. An application of the macroporous super breathable, dry and sanitary product according to any one of claims 1 to 5, characterized in that: The sanitary product is applied to baby diapers, female sanitary napkins or adult incontinence care products.

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