A dry absorbent article and a method of making the same

Abstract

This invention relates to a dry absorbent product and its preparation method. The dry absorbent product comprises, from top to bottom, a skin-friendly layer, an absorbent layer, and a leak-proof bottom layer. The skin-friendly layer includes a skin-friendly upper layer and a skin-friendly lower layer. The skin-friendly upper layer is made of ES fiber, and the skin-friendly lower layer is made of at least one fiber selected from core-sheath fiber, eccentric fiber, and hollow fiber. The surface of the skin-friendly layer is embossed. The absorbent layer includes a central raised absorbent layer and a non-raised absorbent layer located below the central raised absorbent layer. In this invention, liquid contacts the skin-friendly layer, and the liquid is rapidly transferred to the skin-friendly lower layer through the skin-friendly upper layer, and then to the absorbent layer through the skin-friendly lower layer. The raised design of the absorbent layer ensures the product's absorption capacity and speed. The design of the skin-friendly upper layer, skin-friendly lower layer, and absorbent layer in this invention solves the problems of slow liquid penetration and absorption speed, difficulty in ensuring surface dryness, and susceptibility to side and back leakage in existing absorbent products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sanitary absorbent products, and particularly relates to a dry and absorbent product and a preparation method thereof. BACKGROUND

[0002] There are generally two kinds of sanitary absorbent products on the market, such as sanitary napkins. One kind is pure cotton, and the surface material of the cotton-soft sanitary napkin is pure cotton material, which is relatively comfortable for the skin but is not fast enough in absorbing menstrual blood. The surface of the sanitary napkin is often relatively wet, which provides conditions for the proliferation of bacteria and easily causes local skin itching and burning pain. The other kind is a dry and absorbent sanitary napkin, which may be slightly better than the cotton-soft one in terms of absorption, and is relatively refreshing. However, the speed of penetration and diffusion of menstrual blood from the surface layer of the sanitary napkin to the lower layer and the speed of absorption are limited, and the dry and comfortable demand of consumers for the sanitary napkin product cannot be met.

[0003] In addition, the high dryness of the sanitary absorbent product is not only closely related to the surface material, but also puts forward requirements for the absorbent core and the like. The cotton core fiber core sanitary napkin with the advantages of soft and close-fitting in the prior art can effectively improve the comfort, and the absorption speed is also relatively fast. However, the absorption amount is generally, the absorption multiple is within 20 times, the thickness is relatively large, and the damp feeling is easily generated, causing odor, breeding bacteria, and being not conducive to the health of consumers. In addition, the cotton core as the absorption layer is relatively easy to break and deform, and side leakage occurs. In addition, many sanitary absorbent products in the prior art usually add a large amount of fluff pulp in the absorbent body, and the fluff pulp itself can only quickly absorb blood but cannot keep the blood, resulting in a product that is not dry and comfortable. In addition, the sanitary absorbent product in the prior art also has the problem of poor air permeability.

[0004] Therefore, in view of the above problems, it is necessary to provide a dry and absorbent product and a preparation method thereof. SUMMARY

[0005] In order to solve one or more technical problems in the prior art, the present application provides a dry and absorbent product and a preparation method thereof.

[0006] The present application provides a dry and absorbent product in a first aspect, which comprises a skin-friendly layer, an absorption layer and a leakage-proof bottom layer from top to bottom; the skin-friendly layer comprises a skin-friendly upper layer and a skin-friendly lower layer, the skin-friendly upper layer is made of ES fiber, and the skin-friendly lower layer is made of at least one of skin-core fiber, partial-core fiber and hollow fiber; the surface of the skin-friendly layer is subjected to embossing treatment; the absorption layer comprises an intermediate raised absorption layer and a non-raised absorption layer located below the intermediate raised absorption layer.

[0007] Preferably, the embossing treatment is a diamond embossing treatment, each diamond embossed line has a thickness of 0.1-5mm, each diamond embossed line comprises a plurality of convex diamonds, the diamond angle of the diamond is 20-160°; the length of the diamond connection along the length direction is 0.1-5mm, and the length of the diamond connection along the width direction is 0.1-3mm; the ratio of the embossing depth to the thickness of the skin-friendly layer is 1:(1-20).

[0008] Preferably, the skin-friendly lower layer is made of sheath-core fibers and core-sheath fibers, the mass ratio of the sheath-core fibers to the core-sheath fibers is (5-10):(0.05-3); the hydrophilicity of the skin-friendly upper layer is weaker than that of the skin-friendly lower layer; the grammage of the skin-friendly upper layer is 10-30g / m 2 ; the grammage of the skin-friendly lower layer is 15-30g / m 2 ; and / or the length of the fiber used in the skin-friendly lower layer is 20-80mm, and the fiber diameter is 0.3denier-10denier.

[0009] Preferably, the length of the middle convex absorption layer is 0.125-1 times the overall length of the dry and fresh absorption article; the width of the middle convex absorption layer is 0.25-1 times the overall width of the dry and fresh absorption article; preferably, the middle convex absorption layer and the non-convex absorption layer are made of wet-made superabsorbent paper; preferably, the grammage of the wet-made superabsorbent paper is 50-150g / m 2 ; the mass percentage of the superabsorbent resin in the wet-made superabsorbent paper is 15-80%; more preferably, the middle convex absorption layer comprises at least one layer of wet-made superabsorbent paper; further preferably, the ratio of the grammage of the wet-made superabsorbent paper used in the middle convex absorption layer to the grammage of the wet-made superabsorbent paper used in the non-convex absorption layer is (1-3):1; and more further preferably, the ratio of the mass percentage of the superabsorbent resin in the wet-made superabsorbent paper used in the middle convex absorption layer to the mass percentage of the superabsorbent resin in the wet-made superabsorbent paper used in the non-convex absorption layer is (0.5-2):1.

[0010] Preferably, the raised absorbent layer has multiple first guide slits, and the non-raised absorbent layer has multiple second guide slits. Preferably, the depth of the first guide slits is 0.1 to 1 times the thickness of the raised absorbent layer, and the depth of the second guide slits is 0.1 to 0.75 times the thickness of the non-raised absorbent layer. Preferably, the length of the first and / or second guide slits is 1 to 50 mm, the width of the first guide slit is 0.1 to 8 mm, and the width of the second guide slit is 0.1 to 5 mm. Preferably, the interval between two adjacent first guide slits is 0.1 to 15 mm, and the interval between two adjacent second guide slits is 1 to 25 mm. More preferably, the interval between two adjacent second guide slits is greater than the interval between two adjacent first guide slits. Preferably, the angle between the first and / or second guide slits and the length direction of the dry absorbent is 30 to 80°.

[0011] Preferably, the absorbent layer further includes a covering absorbent layer that covers the intermediate raised absorbent layer; preferably, the covering absorbent layer includes an upper covering absorbent layer located above the intermediate raised absorbent layer and a lower covering absorbent layer located below the intermediate raised absorbent layer, or the covering absorbent layer covers the lower surface of the intermediate raised absorbent layer, the covering absorbent layer extending upward from both sides to form a folded portion, the folded portion covering the upper surface of the intermediate raised absorbent layer, and an opening between the two ends of the folded portion; or the covering absorbent layer covers the upper surface of the intermediate raised absorbent layer, the covering absorbent layer extending downward from both sides to form a folded portion, the folded portion covering the lower surface of the intermediate raised absorbent layer, and an opening between the two ends of the folded portion; more preferably, the width of the opening is 0.1 to 0.9 times the width of the intermediate raised absorbent layer; preferably, the covering absorbent layer is made of one or more of wet-strength paper, dust-free paper, and wet-process superabsorbent resin absorbent paper; more preferably, the covering absorbent layer is made of wet-process superabsorbent resin absorbent paper.

[0012] Preferably, the dry absorbent product further includes a flow-guiding layer disposed between the skin-friendly layer and the absorbent layer; the flow-guiding layer is a non-woven fabric layer; and / or the leak-proof bottom layer is a PE film layer.

[0013] Preferably, the leak-proof bottom layer is a breathable PE membrane, and the preparation of the breathable PE membrane includes the following steps:

[0014] (a) Talc powder and water are mixed and stirred under high temperature and high pressure, and then filtered to obtain filter cake. The filter cake is ultrasonically treated with hydrochloric acid and maleic acid solution in sequence, and then filtered, washed, dried and calcined in sequence to obtain pretreated talc powder.

[0015] (b) Add silane coupling agent and pH adjuster to anhydrous ethanol and stir until homogeneous to obtain a coupling agent solution with pH 4 to 6.

[0016] (c) Disperse polyvinyl alcohol evenly with water to obtain a polyvinyl alcohol solution. Then add pretreated talc powder and cationic surfactant to the polyvinyl alcohol solution and mix evenly to obtain a mixture. Then add the coupling agent solution to the mixture and stir to react. After filtration, washing and drying, modified talc powder is obtained.

[0017] (d) The linear low-density polyethylene, modified talc, plasticizer, antioxidant and stabilizer are mixed and granulated to obtain masterbatch;

[0018] (e) After drying the masterbatch, it is sequentially cast into a film and stretched and stabilized to obtain a breathable PE film.

[0019] Preferably, in step (a), the talc powder and water are mixed at a mass ratio of 1:(1.5-2.5), and stirred under high temperature and high pressure at 160-200℃ and 1.5-1.8MPa for 50-60 min; the hydrochloric acid has a mass fraction of 10-12%; the maleic acid solution uses anhydrous ethanol as a solvent and has a mass fraction of 20-40%; the ultrasonic treatment time is 2-4 h; and / or the calcination is performed at 800-1000℃ for 1-3 h; in step (b), the mass ratio of anhydrous ethanol to the silane coupling agent is 100:(10-40); in step (c), polyethylene... The enol solution has a mass fraction of 8-12%, and the mass ratio of polyvinyl alcohol, pretreated talc, and cationic surfactant in the polyvinyl alcohol solution is (5-15):(80-120):(3-5), and / or the mass ratio of the mixture to the coupling agent solution is (1-2.5):1; in step (c), the temperature of the stirring reaction is 50-80°C, and the stirring reaction time is 1-4 h; and / or in step (d), the mass ratio of linear low-density polyethylene, modified talc, plasticizer, antioxidant, and stabilizer is (120-180):(30-50):(1-4):(1-4):(2-6).

[0020] The present invention provides a second aspect of a method for preparing the dry absorbent product described in the first aspect, the method comprising the following steps:

[0021] (1) A skin-friendly upper layer is made of ES fiber, and a skin-friendly lower layer is made of at least one of the following fibers: core-sheath fiber, eccentric fiber, and hollow fiber. The skin-friendly upper layer and the skin-friendly lower layer are combined together to obtain a skin-friendly layer, and the surface of the skin-friendly layer is embossed.

[0022] (2) The intermediate raised absorption layer is composited on top of the non-raised absorption layer to obtain an absorption layer; optionally, the intermediate raised absorption layer is coated with a coating absorption layer and then composited on top of the non-raised absorption layer; optionally, a first flow guide slit is formed in the intermediate raised absorption layer and a second flow guide slit is formed in the non-raised absorption layer.

[0023] (3) The skin-friendly layer, the absorbent layer and the leak-proof bottom layer are sequentially laminated to obtain a dry and absorbent product; optionally, a flow-guiding layer is laminated between the skin-friendly layer and the absorbent layer.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] (1) The skin-friendly layer of this invention is made of fibers with different structures in the upper and lower layers. The upper layer is made of ES fiber, which has low liquid residue and good dryness, allowing the liquid to be quickly conducted to the skin-friendly lower layer. The lower layer is made of at least one of the following fibers: core-sheath fiber, eccentric fiber, and hollow fiber, which has fast absorption speed and good dryness, and better conduction to the absorbent layer, making the skin-friendly layer a dry and comfortable non-woven fabric, which is beneficial to improving the dryness and comfort of dry absorbent products. The skin-friendly layer is embossed to promote absorption while ensuring liquid conduction on the surface, ensuring the dryness of the product. Preferably, the skin-friendly layer is designed with a diamond embossing pattern, with a spacing of 2-20mm between each two adjacent diamond embossing patterns, a line thickness of 0.1-5mm for each diamond embossing pattern, and each diamond embossing pattern includes multiple raised diamonds. The length of the diamond connection is 0.1-5mm along the length direction and 0.1-3mm along the width direction. This diamond embossing design forms a guide between adjacent diamonds. The flow channels facilitate liquid conduction, ensuring product dryness in multiple ways. In this invention, the diamond embossing process creates a raised diamond texture on the surface of the absorbent material. This texture not only enhances the product's feel and aesthetics, making it more attractive, but more importantly, it increases the surface texture area, promoting diffusion and improving the absorbent material's absorption capacity. This allows it to absorb liquid more quickly, providing better moisture absorption. Furthermore, the diamond embossing process creates multiple raised diamond areas on the surface, helping to distribute the liquid evenly and preventing large-area accumulation, thus improving the liquid dispersion of the absorbent material. In addition, the raised diamond texture increases surface friction, providing better anti-slip properties and improved fixation and stability. This invention demonstrates that the diamond embossing process significantly improves the performance and user experience of absorbent materials.

[0026] (2) The absorbent layer of this invention uses a wet-process high-absorbency resin absorbent paper to form a convex structure, making absorbent products such as sanitary napkins closer to the human body and improving their fit. This increases the absorption rate of menstrual blood, allowing for timely absorption during heavy flow and ensuring the surface of the sanitary napkin remains dry, preventing side or back leakage. Furthermore, the convex absorbent layer does not use fluff pulp, ensuring product dryness while avoiding clumping, breakage, and deformation common in existing technologies. The convex absorbent layer structure of this invention is stable. The convex design of the absorbent layer in this invention ensures the product's absorption capacity and absorption speed. This invention solves the problems of slow absorption of liquids such as menstrual blood in existing sanitary absorbent products, difficulty in ensuring the dryness of the product surface, and easy side and back leakage. Preferably, the raised absorbent layer and the non-raised absorbent layer use different weights of wet-process superabsorbent resin absorbent paper. The weight of the wet-process superabsorbent resin absorbent paper in the raised absorbent layer is greater than or equal to that in the non-raised absorbent layer, and the amount of superabsorbent resin added in the raised absorbent layer is greater than or equal to that in the non-raised absorbent layer. This ensures the product's absorbency while helping to maintain its dryness.

[0027] (3) In some preferred technical solutions of the present invention, the absorbent layer has a flow guide design, and the flow guides of the middle raised absorbent layer and the non-raised absorbent layer are set differently. The flow guides of the middle raised absorbent layer are more densely distributed, and the conduction is faster when the liquid volume is large. This allows the middle raised absorbent layer to quickly seep down and conduct laterally and longitudinally when there is a lot of liquid to be absorbed (such as menstrual blood), so as to conduct the liquid in a timely manner.

[0028] (4) The dry absorbent material in some preferred embodiments of the present invention has excellent breathability. The leak-proof bottom layer uses a specially made breathable PE membrane with excellent breathability. The modified talc in the breathable PE membrane effectively improves the breathability of the polyethylene membrane. Compared with ordinary talc, the interlayer structure of the modified talc is effectively broadened. The addition of the modified talc and the extensibility during the stretching and stabilization process can broaden and peel the layered structure of the modified talc, forming micropores and microporous structures. These micropores and microporous structures can provide multiple channels, thereby improving the breathability. The present invention modifies the talc before adding it to the polyethylene matrix to prepare the breathable PE membrane. The ultrasonic treatment process using maleic acid solution can improve the dispersibility, wettability and surface activity of the talc, which helps to enhance the compatibility and interaction between the modified talc and the polyethylene matrix, and improve their mutual adhesion, thereby increasing the connectivity and uniformity of the micropores. In the process of preparing the mixture, the pretreated talc and polyvinyl alcohol solution and cationic surfactant are used. The mixing of talc and silane coupling agents is also crucial for the formation of microporous structures and air permeability. It allows for better interaction and dispersion of pretreated talc, polyvinyl alcohol, and silane coupling agents, resulting in modified talc that promotes micropore formation and creates a more uniform microporous structure. This ensures the uniform distribution of the microporous structure throughout the polyethylene membrane, thereby improving the consistency of air permeability. These micropores and microporous structures provide effective channels and diffusion paths, achieving excellent air permeability. Furthermore, the addition of cationic surfactants helps improve the interfacial interaction between modified talc and the polyethylene matrix, reducing friction and adhesion between modified talc particles, increasing the interaction and interfacial strength between the filler and the polyethylene matrix, and promoting the formation of a uniform and stable microporous structure, ensuring stable membrane air permeability. This invention reveals that modifying talc with maleic acid, polyvinyl alcohol, cationic surfactants, and silane coupling agents plays a significant role in improving the effect of modified talc in polyethylene membranes, thereby enhancing the air permeability of the polyethylene membrane. Attached Figure Description

[0029] The accompanying drawings are provided for illustrative purposes only, and the proportions and sizes of the parts in the drawings may not necessarily match the actual product.

[0030] Figure 1 This is a cross-sectional structural diagram of a dry absorbent product according to some specific embodiments of the present invention;

[0031] Figure 2 This is a schematic diagram showing the distribution of rhomboid embossing in the skin-friendly layer in some specific embodiments of the present invention;

[0032] Figure 3This is a schematic diagram showing the distribution of the first flow guide slit in the intermediate raised absorption layer in some specific embodiments of the present invention.

[0033] In the diagram: 1: Skin-friendly layer; 11: Skin-friendly upper layer; 12: Skin-friendly lower layer; 2: Middle raised absorbent layer; 21: First drainage seam; 3: Non-raised absorbent layer; 4: Covering absorbent layer; 41: Folded part; 42: Opening; 5: Leak-proof bottom layer; 6: Rhombus; 7: Rhombus connection. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In a first aspect, the present invention provides a dry absorbent product. Figure 1 This is a cross-sectional structural diagram of a dry absorbent product according to some specific embodiments of the present invention; Figure 2 This is a schematic diagram showing the distribution of rhomboid embossing in the skin-friendly layer in some specific embodiments of the present invention; Figure 3 This is a schematic diagram showing the distribution of the first flow guide slit in the intermediate raised absorption layer in some specific embodiments of the present invention.

[0036] In this invention, the dry absorbent product, for example, Figure 1As shown, the dry absorbent product comprises, from top to bottom, a skin-friendly layer 1, an absorbent layer, and a leak-proof bottom layer 5 (also referred to as the bottom layer); the skin-friendly layer 1 includes a skin-friendly upper layer 11 and a skin-friendly lower layer 12, with the skin-friendly lower layer 12 closer to the absorbent layer; the skin-friendly upper layer 11 is made of ES fiber (ES core-sheath fiber), and the skin-friendly lower layer 12 is made of at least one fiber selected from core-sheath fiber, eccentric fiber, and hollow fiber; in this invention, the core-sheath fiber can be, for example, ES core-sheath fiber, the eccentric fiber can be, for example, ES eccentric fiber, and the hollow fiber can be, for example, ES hollow fiber; in this invention, ES core-sheath fiber refers to ES fiber with a core-sheath structure, ES eccentric fiber refers to ES fiber with an eccentric structure, and eccentric fiber typically has characteristics such as rapid penetration, low rewetting, and good resilience; ES hollow fiber refers to ES fiber with a hollow structure. This invention does not specifically limit the ES core-sheath fiber, ES eccentric fiber, ES hollow fiber, etc., and uses commercially available products or... Products prepared by existing methods are acceptable. The ES eccentric fiber can be, for example, a product purchased from companies such as Far East Composite Fiber Co., Ltd. or Huiweishi Chemical Fiber Co., Ltd. The surface of the skin-friendly layer 1 is embossed. The absorbent layer includes a centrally raised absorbent layer 2 and a non-raised absorbent layer 3 located below the centrally raised absorbent layer 2. The centrally raised absorbent layer 2 is located at the center above the non-raised absorbent layer 3 and is raised relative to the non-raised absorbent layer 3. In this invention, for example, the centrally raised absorbent layer 2 is formed by multiple layers of wet-process superabsorbent resin absorbent paper, or by folding wet-process superabsorbent resin absorbent paper into multiple layers. Preferably, in this invention, the absorbent layer further includes a covering absorbent layer 4 covering the centrally raised absorbent layer 2. The covering absorbent layer 4 can be made of absorbent paper or other absorbent materials. Preferably, the absorbent layer is slit to form a guide slit. This invention does not specifically limit the core-sheath fiber, eccentric fiber, or hollow fiber; these are known products in the prior art. In this invention, the dry absorbent product is preferably a dry sanitary napkin.

[0037] The skin-friendly layer of this invention is made of different fibers in the upper and lower layers. The upper layer is made of ES fiber, which has low liquid residue and good dryness, allowing liquid to be quickly conducted to the skin-friendly lower layer. The lower layer is made of at least one of the following fibers: core-sheath fiber, eccentric fiber, and hollow fiber, which has fast absorption speed and good dryness, and better conduction to the absorbent layer. This makes the skin-friendly layer a dry and comfortable non-woven fabric, which is beneficial to improving the dryness and comfort of dry absorbent products. The skin-friendly layer is embossed to promote absorption while ensuring liquid conduction on the surface, thus ensuring the dryness of the product. The absorbent layer of this invention preferably uses a wet-process superabsorbent resin paper to form a convex structure, making the absorbent product, such as a sanitary napkin, closer to the human body and more conforming to the body. This improves the absorption speed of menstrual blood, allowing for timely absorption during heavy flow and ensuring the surface of the sanitary napkin remains dry, preventing side or back leakage. Furthermore, the convex absorbent layer does not use fluff pulp, ensuring product dryness while avoiding clumping, breakage, and deformation common in existing technologies. The convex absorbent layer structure of this invention is stable. The convex design of the absorbent layer in this invention ensures the product's absorption capacity and speed, solving the problems of slow absorption of liquids such as menstrual blood in existing sanitary absorbent products, difficulty in ensuring the dryness of the surface, and susceptibility to side and back leakage.

[0038] According to some preferred embodiments, the embossing process is a diamond-shaped embossing process, for example, as... Figure 2As shown; the thickness of each diamond embossed line is 0.1–5 mm (e.g., 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, or 5 mm). Each diamond embossed line includes multiple raised diamonds 6, the angle of which is 20–160°. The distance between the centers of the raised diamonds of any two adjacent parallel diamond embossed lines is 2–20 mm (e.g., 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7). The lengths of the rhombuses are 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, or 20 mm. Specifically, for a rhombus, it is preferred that one angle of the rhombus is 20-80°, and the adjacent angles are supplementary to that angle; the length of the rhombus connection 7 along the longitudinal direction is 0.1-5 mm (e.g., 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, 2.2). The embossing depth to the thickness of the skin-friendly layer is 1:(1-20) (e.g., 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15). (1:16, 1:17, 1:18, 1:19 or 1:20); In this invention, raised rhombus refers to a raised rhombus; The rhombus embossing design of this invention increases the area between adjacent rhombuses, increasing product diffusion. At the same time, the rhombus design adds product flow guidance design. The depth design of the rhombus embossing makes the rhombuses protrude in the unpressed areas. After the product absorbs blood, it quickly diffuses and absorbs, achieving a dry effect, which can effectively avoid the problem of the product not drying for a long time after absorbing blood; In this invention, during the embossing process, the pressing area is concave inward towards the absorbent layer. The depth of the concavity is the embossing depth, and the concavity of the pressing area makes each rhombus convex outward, forming a raised rhombus.

[0039] In this invention, the skin-friendly layer is preferably treated with a diamond-shaped embossing. The interval between each pair of adjacent diamond embossings is 2-20 mm, the line thickness of each diamond embossing is 0.1-5 mm, and each diamond embossing includes multiple raised diamonds. The length of the diamond connection is 0.1-5 mm along the length direction and 0.1-3 mm along the width direction. This diamond-shaped embossing design forms a flow channel between adjacent diamonds, which is beneficial for liquid conduction and ensures the dryness of the product in multiple ways. In this invention, the diamond-shaped embossing treatment creates a raised diamond texture on the surface of the absorbent material. This texture not only increases the tactile feel and aesthetics of the product, making it more attractive. More importantly, the raised diamond embossing treatment increases the surface texture area, which is beneficial for increasing product diffusion. This helps improve the absorbency of absorbent products, enabling them to absorb liquids more quickly and providing better moisture absorption performance. Furthermore, the diamond embossing treatment creates multiple raised diamond-shaped areas on the surface, helping to distribute the liquid evenly and preventing large-area accumulation, thus improving the liquid dispersibility of the absorbent product. In addition, the raised diamond texture increases surface friction, providing better anti-slip properties and better fixation and stability. This invention has found that the diamond embossing treatment can significantly improve the performance and user experience of absorbent products.

[0040] According to some preferred embodiments, the skin-friendly lower layer is made of core-sheath fibers and eccentric fibers, with a mass ratio of core-sheath fibers to eccentric fibers of (5-10):(0.2-3). This invention uses core-sheath fibers combined with eccentric fibers to form the skin-friendly lower layer, resulting in a non-woven fabric with fast absorption, low backflow, and good resilience. However, eccentric fibers themselves are more expensive. A preferred mass ratio of core-sheath fibers to eccentric fibers is (5-10):(0.2-3). This is because, this invention has found that while increasing the proportion of eccentric fibers within a certain range can improve product performance, an excessively high proportion of eccentric fibers does not significantly improve product performance, but it does significantly increase costs. The skin-friendly upper layer is hydrophilic. The hydrophilic upper layer, with weaker hydrophilicity than the skin-friendly lower layer, primarily aims to achieve hydrophilic penetration, while the skin-friendly lower layer requires stronger hydrophilicity to achieve rapid hydrophilic diffusion. In this invention, the skin-friendly upper layer can be treated with an oil agent with relatively weak hydrophilicity, and the skin-friendly lower layer can be treated with an oil agent with strong hydrophilicity. This invention does not specifically limit the type of oil agent used, as it is conventional technology in the field. For example, oil agents commonly used in hygiene product materials can be used. For instance, the skin-friendly upper layer can use a hydrophilic oil agent of type 12667, and the skin-friendly lower layer can use a hydrophilic oil agent of type HA001 and / or 15689. The basis weight of the skin-friendly upper layer is 10–30 g / m³. 2The weight of the skin-friendly lower layer is 15-30 g / m³. 2 ; and / or the fiber length of the skin-friendly lower layer is 20-80 mm and the fiber diameter is 0.3 denier-10 denier.

[0041] In this invention, preferably, the skin-friendly upper layer is a hot-air nonwoven fabric made of ES fiber, and the skin-friendly lower layer is a hot-air nonwoven fabric made of core-sheath fiber and eccentric fiber. The hot-air nonwoven fabric is highly comfortable, fluffy, and provides a good wearing experience. This invention uses hot-air nonwoven fabric, for example, composed of double-carded or double-layered fabric, which can provide more product options and take into account both softness and dryness.

[0042] According to some preferred embodiments, the skin-friendly upper layer uses ES fibers with a diameter of 1.2 denier to 2.5 denier. These fibers have a soft feel, and the dryness of ES fibers with this denier is significantly improved, resulting in a layered effect when liquid seeps into the product and preventing a lot of liquid residue in the material. In some specific embodiments, the ES fibers are a mixture of 1.2 denier and 2.0 denier ES fibers.

[0043] According to some preferred embodiments, the length of the intermediate raised absorbent layer 2 is 0.125 to 1 times the overall length of the dry absorbent product, preferably 0.125 to 0.8 times; the width of the intermediate raised absorbent layer 2 is 0.25 to 1 times the overall width of the dry absorbent product, preferably 0.125 to 0.8 times; in this invention, the length and width of the non-raised absorbent layer 3 are, for example, consistent with the overall length and overall width of the dry absorbent product, respectively; preferably, the intermediate raised absorbent layer 2 and the non-raised absorbent layer 3 are made of wet-process superabsorbent resin absorbent paper. In this invention, the intermediate raised absorbent layer 2 can be, for example, N (N≥1) layers of wet-process superabsorbent resin absorbent paper laid flat, or formed by folding N layers (N≥1) of wet-process superabsorbent resin absorbent paper; preferably, the basis weight of the wet-process superabsorbent resin absorbent paper is 50 to 150 g / m². 2The superabsorbent polymer (SAP) content in the wet-process superabsorbent polymer paper is 15-80% by mass; more preferably, the intermediate raised absorbent layer 2 includes at least one layer of wet-process superabsorbent polymer paper; even more preferably, the basis weight of the wet-process superabsorbent polymer paper used in the intermediate raised absorbent layer 2 is (1-3):1 to the basis weight of the wet-process superabsorbent polymer paper used in the non-raised absorbent layer 3; even more preferably, the ratio of the SAP content in the wet-process superabsorbent polymer paper used in the intermediate raised absorbent layer 2 to the SAP content in the wet-process superabsorbent polymer paper used in the non-raised absorbent layer 3 is (0.5-2):1, preferably (1-2):1; more preferably, the absorbent layer further includes a covering absorbent layer 4 covering the intermediate raised absorbent layer 2; the covering absorbent layer 4 includes an upper covering absorbent layer and a lower covering absorbent layer, or... The absorbent coating 4 is either an absorbent coating with an opening facing downwards or an absorbent coating with an opening facing upwards. Preferably, the width of the opening is 0.1 to 0.9 times the width of the intermediate raised absorbent layer. In this invention, when the absorbent coating 4 includes an upper absorbent coating and a lower absorbent coating, the length and width of the upper and lower absorbent coatings can be the same as the length and width of the intermediate raised absorbent layer, or the same as the length and width of the non-raised absorbent layer. Preferably, the intermediate raised absorbent layer and the non-raised absorbent layer use different weights of wet-process superabsorbent resin absorbent paper. The weight of the wet-process superabsorbent resin absorbent paper in the intermediate raised absorbent layer is greater than or equal to the weight of the wet-process superabsorbent resin absorbent paper in the non-raised absorbent layer, and the amount of superabsorbent resin added in the intermediate raised absorbent layer is greater than or equal to the amount of superabsorbent resin added in the non-raised absorbent layer. This ensures the product's absorbency while maintaining its dryness.

[0044] According to some preferred embodiments, the intermediate raised absorption layer 2 is provided with multiple (two or more) first guide slits 21. Figure 1 (Not shown in the image), the non-protruding absorption layer 3 is provided with multiple second flow guide slits ( Figure 1(Not shown in the image), preferably, the depth of the first guide slit 21 is 0.1 to 1 times the thickness of the intermediate raised absorption layer 2, and the depth of the second guide slit is 0.1 to 0.75 times the thickness of the non-raised absorption layer 3; preferably, the length of the first guide slit 21 and / or the second guide slit is 1 to 50 mm (e.g., 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm), the width of the first guide slit 21 is 0.1 to 8 mm (e.g., 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, or 8 mm), and the width of the second guide slit is 0.1 to 5 mm (e.g., 0.1, 0.5, 1, 2, 3, 4, or 5 mm); preferably, the interval between two adjacent first guide slits 21 is 0.1 mm. ~15mm (e.g., 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15mm), the interval between two adjacent second guide slits is 1~25mm (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25mm), more preferably, the interval between two adjacent second guide slits is greater than the interval between two adjacent first guide slits 21; preferably, the angle between the first guide slit 21 and / or the second guide slit and the length direction of the dry absorbent is 30~80° (e.g., 30°, 40°, 50°, 60°, 70° or 80°), for example, as Figure 3 As shown. Preferably, the absorbent layer of the present invention has a flow guiding slit design, and the flow guiding slits of the raised absorbent layer and the non-raised absorbent layer are set differently. The flow guiding slits of the raised absorbent layer are more densely distributed, and the conduction is faster when the liquid volume is large. This allows the raised absorbent layer to quickly seep down and conduct laterally and longitudinally when there is a lot of liquid to be absorbed (such as menstrual blood), so as to conduct the liquid in a timely manner.

[0045] According to some preferred embodiments, the absorbent layer further includes a covering absorbent layer 4 covering the intermediate protruding absorbent layer 2; preferably, the covering absorbent layer 4 includes an upper covering absorbent layer above the intermediate protruding absorbent layer 2 and a lower covering absorbent layer below the intermediate protruding absorbent layer 2, or the covering absorbent layer 4 covers the lower surface of the intermediate protruding absorbent layer 2, the covering absorbent layer 4 extending upward from both sides to form folded portions 41, the folded portions 41 covering the upper surface of the intermediate protruding absorbent layer 2, and the folded portions 41 having an opening 42 between their two ends, or the covering absorbent layer 4 covers the intermediate protruding absorbent layer On the upper surface of layer 2, the covering absorbent layer 4 extends downward from both sides to form folded portions 41, which cover the lower surface of the intermediate raised absorbent layer 2. An opening 42 (spaced) is provided between the two ends of the folded portion 41. More preferably, the width of the opening 42 is 0.1 to 0.9 times the width of the intermediate raised absorbent layer 2. Preferably, the covering absorbent layer 4 is made of one or more of wet-strength paper, dust-free paper, and wet-laid superabsorbent resin paper. More preferably, the covering absorbent layer 4 is made of wet-laid superabsorbent resin paper with a basis weight of 10 to 100 g / m². 2 The superabsorbent resin in the wet-process superabsorbent resin paper has a mass percentage content of 15-60%; in this invention, the wrapping absorbent layer also serves as an absorbent layer, which can absorb liquid, conduct liquid, lock in liquid and prevent backflow.

[0046] According to some preferred embodiments, the coated absorbent layer includes an upper coated absorbent layer and a lower coated absorbent layer, both of which are formed from a single sheet of wet-laid superabsorbent resin paper; the length and width of the upper and lower coated absorbent layers are the same as the length and width of the non-protruding absorbent layer or the intermediate protruding absorbent layer, respectively; the basis weight of the wet-laid superabsorbent resin paper is 10–100 g / m². 2 The superabsorbent resin in the wet-process superabsorbent resin paper has a mass percentage content of 15-60%.

[0047] According to some preferred embodiments, the dry absorbent product further includes a flow-guiding layer disposed between the skin-friendly layer 1 and the absorbent layer; the flow-guiding layer is a non-woven fabric layer; in this invention, the flow-guiding layer can be one or more of hot-air non-woven fabric, spunbond non-woven fabric, and spunlace non-woven fabric; preferably, the flow-guiding layer is made of hot-air non-woven fabric, and the fiber diameter of the hot-air non-woven fabric is 1-3 denier; in this invention, the flow-guiding layer non-woven fabric is used to promote liquid penetration, and this invention has found that using hot-air non-woven fabric with a fiber diameter of 1-3 denier results in coarser fibers and better flow-guiding effect; and / or the leak-proof bottom layer 5 is a PE film layer.

[0048] It should be noted that, in this invention, the skin-friendly layer, the absorbent layer, and the leak-proof bottom layer can be connected by overlapping with adhesive spray, i.e., sequentially bonded together with hot melt adhesive. Other layers can also be sequentially bonded together with hot melt adhesive. Figure 1 The peeling state between layers shown is merely to clearly illustrate the structure of each layer; in this invention, the wet-process superabsorbent resin paper is prepared by existing wet papermaking processes. This invention does not impose specific limitations, and the paper is made of known materials in the prior art, such as those described in existing wet papermaking processes, such as those in CN201710966882.0 or CN201910661219.9.

[0049] However, existing absorbent products typically use traditional PE film as the leak-proof bottom layer. However, traditional PE film generally has poor breathability. When used as the leak-proof bottom layer (bottom layer) of absorbent products, the breathability of the absorbent products still needs to be further improved, and it is easy to cause a stuffy feeling.

[0050] According to some preferred embodiments, the leak-proof bottom layer is a breathable PE membrane, and the preparation of the breathable PE membrane includes the following steps:

[0051] (a) Talc powder and water are mixed and stirred under high temperature and high pressure, then filtered to obtain a filter cake. The filter cake is then ultrasonically treated with hydrochloric acid and maleic acid (also known as maleic acid) solutions, and then filtered, washed, dried and calcined to obtain pretreated talc powder. The present invention does not specify the amount of filter cake and hydrochloric acid and maleic acid solution used, as long as the filter cake is completely immersed in the hydrochloric acid and maleic acid solutions. The present invention does not specify the washing and drying, and those skilled in the art can choose conventionally, for example, deionized water and / or anhydrous ethanol can be used for washing, and drying can be carried out at 100-150°C to constant weight.

[0052] (b) Add silane coupling agent and pH adjuster to anhydrous ethanol and stir until homogeneous to obtain a coupling agent solution with pH 4 to 6; the present invention does not specifically limit the pH adjuster and its amount, as long as it can adjust to obtain a coupling agent solution with pH 4 to 6, and the pH adjuster can be, for example, acetic acid, formic acid and / or hydrochloric acid;

[0053] (c) Polyvinyl alcohol (CAS number: 9002-89-5) is uniformly dispersed in water to obtain a polyvinyl alcohol solution. Then, pretreated talc powder and cationic surfactant are added to the polyvinyl alcohol solution and mixed uniformly to obtain a mixture. Then, the coupling agent solution is added to the mixture and stirred for reaction. After filtration, washing and drying, modified talc powder is obtained. The cationic surfactant is, for example, a quaternary ammonium salt cationic surfactant, which is at least one of quaternary ammonium salt tert-butylammonium chloride, tetrabutylammonium chloride, butyltrimethylammonium chloride, octyltrimethylammonium chloride and dodecyltrimethylammonium chloride. In step (c), the temperature of the stirring reaction is, for example, 50-80°C, the stirring reaction time is, for example, 1-4 hours, and the stirring speed is, for example, 500-800 r / min.

[0054] (d) The linear low-density polyethylene, modified talc, plasticizer, antioxidant, and stabilizer are mixed and granulated to obtain a masterbatch. This invention does not specifically limit the linear low-density polyethylene; commercially available products or products synthesized using existing technology can be used. For example, the linear low-density polyethylene is linear low-density polyethylene with a melt flow rate of 3.2–4.0 g / 10 min. This invention does not specifically limit the types of plasticizer, antioxidant, and stabilizer; any conventional plasticizer, antioxidant, and stabilizer used in polyethylene film molding is acceptable.

[0055] (e) After drying the masterbatch, it is sequentially cast into a film and stretched and stabilized to obtain a breathable PE film; the present invention does not specifically limit the casting and stretching processes, which are conventional techniques in the field.

[0056] The leak-proof bottom layer of this invention preferably uses a breathable PE membrane with excellent breathability, specially prepared in steps (a) to (e) of this invention. This membrane allows for excellent breathability of the dry absorbent material, which can also be referred to as a dry and breathable absorbent material. In this invention, the use of modified talc in the preferred breathable PE membrane effectively improves the breathability of the polyethylene membrane. Compared with ordinary talc, the interlayer structure of the modified talc is effectively broadened. The addition of the modified talc and its extensibility during the tensile stabilization process allow for a more layered structure of the modified talc. To broaden and peel, micropores and microporous structures are formed, which can provide multiple channels, thereby improving air permeability. In this invention, talc powder is modified and then added to a polyethylene matrix to prepare a breathable PE membrane. The ultrasonic treatment process using maleic acid solution improves the dispersibility, wettability, and surface activity of the talc powder, helping to enhance the compatibility and interaction between the subsequently modified talc powder and the polyethylene matrix, improving their mutual adhesion, and thus increasing the connectivity and uniformity of the micropores. During the preparation of the mixture, pretreatment... The mixing of talc powder with polyvinyl alcohol solution, cationic surfactant, and silane coupling agent is also crucial for the formation of microporous structure and air permeability. It allows for better interaction and dispersion of pretreated talc powder, polyvinyl alcohol, and silane coupling agent, resulting in modified talc powder that promotes micropore formation and creates a more uniform microporous structure. This ensures the uniform distribution of the microporous structure throughout the polyethylene membrane, thereby improving the consistency of air permeability. These micropores and microporous structures provide effective channels and diffusion paths, achieving excellent air permeability. Furthermore, the addition of cationic surfactant helps improve the interfacial interaction between modified talc powder and the polyethylene matrix, reducing friction and adhesion between modified talc powder particles, increasing the interaction and interfacial strength between the filler and the polyethylene matrix, and facilitating the formation of a uniform and stable microporous structure, ensuring stable membrane air permeability. This invention reveals that modifying talc powder with maleic acid, polyvinyl alcohol, cationic surfactant, and silane coupling agent plays a significant role in improving the effect of modified talc powder in polyethylene membranes, thereby enhancing the air permeability of the polyethylene membrane.

[0057] According to some preferred embodiments, in step (a), the talc powder and water are mixed at a mass ratio of 1:(1.5–2.5) (e.g., 1:1.5, 1:2, or 1:2.5), and stirred under high temperature and high pressure (160–200°C, e.g., 160°C, 170°C, 180°C, 190°C, or 200°C) and 1.5–1.8 MPa (e.g., 1.5, 1.6, 1.7, or 1.8 MPa) for 50–60 min (e.g., 50, 55, or 60 min). The hydrochloric acid has a mass fraction of 10-12% (e.g., 10%, 11%, or 12%), meaning the hydrochloric acid contains 10-12% HCl by mass; the maleic acid solution uses anhydrous ethanol as a solvent, and the maleic acid solution has a mass fraction of 20-40% (e.g., 20%, 25%, 30%, 35%, or 40%), meaning the maleic acid solution contains 20-40% maleic acid by mass; the ultrasonic treatment time is 2-4 hours (e.g., 2, 2.5, 3, 3 hours).5 or 4 hours), and / or the calcination is carried out at 800-1000°C (e.g., 800°C, 850°C, 900°C, 950°C, or 1000°C) for 1-3 hours; in step (b), the mass ratio of the anhydrous ethanol to the silane coupling agent is 100:(10-40) (e.g., 100:10, 100:15, 100:20, 100:25, 100:30, 100:35, or 100:40); in step (c), the mass fraction of the polyvinyl alcohol solution is 8-12% (e.g., 8%, 9%, 10%, 11%, or 12%), that is, the polyvinyl alcohol solution contains a mass fraction of polyvinyl alcohol. The polyvinyl alcohol solution contains 8-12% polyvinyl alcohol, and the mass ratio of pretreated talc to cationic surfactant in the solution is (5-15):(80-120):(3-5) (e.g., 5:80:3, 5:90:3, 5:100:3, 5:110:3, 5:120:3, 10:80:3, 10:90:3, 10:100:3, 10:110:3, 10:120:3, 15:80:3, 15:90:3, 15:100:3, 15:110:3, 15:120:3, 5:80:4, 5:90:4, 5:100:4). 5:110:4, 5:120:4, 10:80:4, 10:90:4, 10:100:4, 10:110:4, 10:120:4, 15:80:4, 15:90:4, 15:100:4, 15:110:4, 15:120:4, 5:80:5, 5:90:5, 5:100:5, 5:110:5, 5:120:5, 10:80:5, 10:90:5, 10:100:5, 10:110:5, 10:120:5, 15:80:5, 15:90:5, 15:100:5, 15:110: The mass ratio of the mixture to the coupling agent solution is (1-2.5):1 (e.g., 1:1, 1.5:1, 2:1, or 2.5:1); in step (c), the temperature of the stirring reaction is 50-80°C (e.g., 50°C, 60°C, 70°C, or 80°C), and the time of the stirring reaction is 1-4 h (e.g., 1, 2, 3, or 4 h); and / or in step (d), the mass ratio of the linear low-density polyethylene, modified talc, plasticizer, antioxidant, and stabilizer is (120-180):(30-50):(1-4):(1-4):(2-6).

[0058] The present invention provides a second aspect of a method for preparing the dry absorbent product described in the first aspect, the method comprising the following steps:

[0059] (1) A skin-friendly upper layer is made of ES fiber, and a skin-friendly lower layer is made of at least one of the following fibers: core-sheath fiber, eccentric fiber, and hollow fiber. The skin-friendly upper layer and the skin-friendly lower layer are combined together to obtain a skin-friendly layer, and the surface of the skin-friendly layer is embossed.

[0060] (2) The intermediate raised absorption layer is composited on top of the non-raised absorption layer to obtain an absorption layer; optionally, the intermediate raised absorption layer is coated with a coating absorption layer and then composited on top of the non-raised absorption layer; optionally, a first flow guide slit is formed in the intermediate raised absorption layer and a second flow guide slit is formed in the non-raised absorption layer.

[0061] (3) The skin-friendly layer, the absorbent layer and the leak-proof bottom layer are sequentially laminated to obtain a dry and absorbent product; optionally, a flow-guiding layer is laminated between the skin-friendly layer and the absorbent layer.

[0062] According to some specific embodiments, the preparation method includes the following steps:

[0063] ① Preparation of the skin-friendly layer: The upper layer is entirely made of ES fiber, with a basis weight of 12g / m². 2 The upper layer is made up of skin-friendly fibers, and the lower layer is composed of core fibers and sheath fibers. The ratio of sheath fibers to core fibers in the lower layer is (9.8-5): (0.2-3), forming the skin-friendly lower layer. The skin-friendly layer is treated with diamond embossing.

[0064] ② Preparation of the absorbent layer: The raised absorbent layer and the non-raised absorbent layer are pressed together to form the first guide seam and the second guide seam respectively. Then, the raised absorbent layer is wrapped around the non-raised absorbent layer and then bonded to it with adhesive by spraying to form the absorbent layer.

[0065] ③ The skin-friendly layer, the diversion layer, and the absorbent layer are sequentially laminated, and then cut using sanitary napkin equipment to obtain a semi-finished product.

[0066] ④ Combine the semi-finished product obtained in step ③ with the leak-proof bottom layer to obtain a dry and absorbent product.

[0067] The present invention will be further described below with reference to the embodiments. These embodiments are merely illustrative examples of preferred implementations of the present invention, and the scope of protection of the present invention should not be construed as being limited to these embodiments.

[0068] Example 1

[0069] A dry and absorbent product, comprising, from top to bottom, a skin-friendly layer, an absorbent layer, and a leak-proof bottom layer; the skin-friendly layer includes a skin-friendly upper layer and a skin-friendly lower layer, with the skin-friendly lower layer closer to the absorbent layer; the skin-friendly upper layer is made of hot-air nonwoven fabric made of ES core-sheath fiber, and the basis weight of the skin-friendly upper layer is 10g / m². 2The skin-friendly lower layer is a hot-air nonwoven fabric made of a mixture of ES core-sheath fibers and ES eccentric fibers, with a mass ratio of ES core-sheath fibers to ES eccentric fibers of 9:1, and a basis weight of 15 g / m². 2 The skin-friendly layer is embossed with a diamond pattern. Each diamond embossed line is 1mm thick and includes multiple raised diamonds. One angle of the diamond is 60°, and the other adjacent angle is complementary to it to form 180°. The length of the diamond connection is 3mm along the length direction and 1mm along the width direction. The ratio of the embossing depth to the overall thickness of the skin-friendly layer is 1:1.05. The absorbent layer includes a central raised absorbent layer, a non-raised absorbent layer, and a covering absorbent layer enclosing the central raised absorbent layer. The length of the central raised absorbent layer is 1 / 3 of the overall length of the dry absorbent product, and the width of the central raised absorbent layer is 1 / 3 of the overall width of the dry absorbent product. The central raised absorbent layer is located in the middle above the non-raised absorbent layer. The central raised absorbent layer consists of three layers of wet-process superabsorbent resin paper, and the non-raised absorbent layer consists of one layer of wet-process superabsorbent resin paper. The basis weight of each layer of wet-process superabsorbent resin paper in the central raised absorbent layer is 120 g / m². 2 ): The basis weight of each wet-process superabsorbent resin paper layer with non-protruding absorbent layer (60g / m²) 2 The content of superabsorbent polymer (SAP) in each layer of wet-process superabsorbent paper with the raised absorbent layer in the middle is 25 wt%; the content of SAP in each layer of wet-process superabsorbent paper with the non-raised absorbent layer is 15 wt%. The covering absorbent layer covers the lower surface of the raised absorbent layer and extends upward from both sides to form folds. The folds cover the upper surface of the raised absorbent layer and have an opening between the two ends of the folds. The width of the opening is 0.4 times the width of the raised absorbent layer. The covering absorbent layer is made of wet-process superabsorbent paper with a basis weight of 80 g / m³. 2The superabsorbent polymer (SAP) in the wet-process superabsorbent polymer paper contains 25% SAP by mass. Multiple first guide slits are provided in the raised absorbent layer, and multiple second guide slits are provided in the non-raised absorbent layer. The length of the first guide slit is 20 mm, and the width of the first guide slit is 0.3 mm. The length of the second guide slit is 20 mm, and the width of the second guide slit is 0.1 mm. The distance between two adjacent first guide slits in the raised absorbent layer is 8 mm, and the distance between two adjacent second guide slits in the non-raised absorbent layer is 12 mm. The depth of the first guide slit is one time the thickness of the raised absorbent layer, and the depth of the second guide slit is 0.75 times the thickness of the non-raised absorbent layer. The angle between the first and second guide slits and the length direction of the dry absorbent is 60°. The leak-proof bottom layer is made of PE film, which is a polyethylene film produced by Tianjin Lihao Sanitary Materials Co., Ltd.

[0070] Example 2

[0071] Example 2 is basically the same as Example 1, except that:

[0072] The skin-friendly layer is not embossed with a diamond pattern and is not embossed.

[0073] Example 3

[0074] Example 3 is basically the same as Example 1, except that:

[0075] The leak-proof bottom layer is made of a breathable PE membrane, which is prepared as follows:

[0076] ① Talc powder and water were mixed at a mass ratio of 1:2 and stirred under high temperature and high pressure at 180℃ and 1.8MPa for 50 min at a stirring speed of 600 r / min. Then, the mixture was filtered to obtain a filter cake. The filter cake was first ultrasonically treated with 10% hydrochloric acid for 3 h, and then ultrasonically treated with 25% maleic acid solution for 3 h. The maleic acid solution used ethanol as a solvent and the ultrasonic treatment was carried out at 50℃ and 50 kHz. After filtration and washing, the mixture was dried at 110℃ to constant weight and then calcined at 900℃ for 2 h to obtain pretreated talc powder.

[0077] ② Add silane coupling agent KH-560 and acetic acid to anhydrous ethanol and stir until homogeneous to obtain a coupling agent solution with pH 4.5; the mass ratio of anhydrous ethanol to silane coupling agent is 100:15.

[0078] ③ Disperse polyvinyl alcohol evenly with water to obtain a 10% polyvinyl alcohol solution. Then, add pretreated talc powder and cationic surfactant (dodecyltrimethylammonium chloride) to the polyvinyl alcohol solution and mix evenly to obtain a mixture. The mass ratio of polyvinyl alcohol, pretreated talc powder and cationic surfactant in the polyvinyl alcohol solution is 10:100:4. Then, add the coupling agent solution to the mixture and stir for 4 hours at 50℃ and 600 r / min. After filtration, washing with deionized water and drying at 110℃ to constant weight, modified talc powder is obtained. The mass ratio of the mixture to the coupling agent solution is 2:1.

[0079] ④ Linear low-density polyethylene, modified talc, plasticizer (dioctyl terephthalate), antioxidant (antioxidant 1010) and stabilizer (calcium stearate) are mixed in a high-speed mixer at a mass ratio of 160:35:3:3:4 for 30 minutes, then transferred to a twin-screw extruder for extrusion granulation to obtain masterbatch.

[0080] ⑤ After drying the masterbatch at 80°C for 10 hours, add it to the hopper of the casting machine, control the casting nozzle temperature to 220°C and the casting roller temperature to 95°C. After casting into a film, perform stretching and stabilization, control the transverse stretch ratio to 1350‰ and the longitudinal stretch ratio to 1300‰, and then cut and rewind to obtain a breathable PE film.

[0081] Example 4

[0082] Example 4 is basically the same as Example 3, except that:

[0083] The leak-proof bottom layer is made of PE film, and the PE film is prepared as follows:

[0084] ① Talc powder and water were mixed at a mass ratio of 1:2 and stirred under high temperature and high pressure at 180℃ and 1.8MPa for 50 min at a stirring speed of 600 r / min. Then, the mixture was filtered to obtain a filter cake. The filter cake was ultrasonically treated with 10% hydrochloric acid for 3 h at 50℃ and 50 kHz. After filtration and washing, the mixture was dried at 110℃ to constant weight and then calcined at 900℃ for 2 h to obtain pretreated talc powder.

[0085] ② Add silane coupling agent KH-560 and acetic acid to anhydrous ethanol and stir until homogeneous to obtain a coupling agent solution with pH 4.5; the mass ratio of anhydrous ethanol to silane coupling agent is 100:15.

[0086] ③ Add pretreated talc powder to water and mix evenly to obtain a mixture, wherein the mass ratio of water to pretreated talc powder is 1:1; then add the coupling agent solution to the mixture and stir for 4 hours at a temperature of 50℃ and a rotation speed of 600r / min, then filter, wash with deionized water and dry at 110℃ to constant weight to obtain modified talc powder; wherein the mass ratio of the mixture to the coupling agent solution is 2:1.

[0087] ④ is the same as step ④ in Example 3.

[0088] ⑤ Same as step ⑤ in Example 3, to obtain a PE film.

[0089] Example 5

[0090] Example 5 is basically the same as Example 3, except that:

[0091] The leak-proof bottom layer is made of PE film, and the PE film is prepared as follows:

[0092] ① Linear low-density polyethylene, talc, plasticizer (dioctyl terephthalate), antioxidant (antioxidant 1010) and stabilizer (calcium stearate) are mixed in a high-speed mixer at a mass ratio of 160:35:3:3:4 for 30 minutes, then transferred to a twin-screw extruder for extrusion granulation to obtain masterbatch.

[0093] ② After drying the masterbatch at 80°C for 10 hours, add it to the hopper of the casting machine, control the casting nozzle temperature to 220°C and the casting roller temperature to 95°C. After casting into a film, perform stretching and stabilization, control the transverse stretching ratio to 1350‰ and the longitudinal stretching ratio to 1300‰, and then cut and rewind to obtain a PE film.

[0094] Comparative Example 1

[0095] Comparative Example 1 is basically the same as Example 1, except that:

[0096] The absorbent layer does not include the intermediate raised absorbent layer, the non-raised absorbent layer, and the coating absorbent layer. The absorbent layer is directly formed by mixing fluff pulp and superabsorbent resin in a mass ratio of 2:1. The basis weight of the absorbent layer is 180 g / m³. 2 .

[0097] The present invention conducted performance tests on the absorbent products in Examples 1 to 5 and Comparative Example 1, and the performance test results are shown in Table 1.

[0098] Test method: Take 5 mL of animal blood twice, with a 10-minute interval between the two times. Record the absorption time for each absorption as the absorption rate in seconds. For reverse osmosis, after the absorbent absorbs 5 mL of animal blood, place a 1.2 kg weight on 10 g of filter paper on top of the absorbent for 1 minute and weigh the increase in weight of the filter paper in grams.

[0099] Table 1: Performance test results of the absorbent products in Examples 1-5 and Comparative Example 1.

[0100]

[0101] As shown in Table 1, the backflow of Examples 1-5 is significantly lower than that of Comparative Example 1. This is related to the structure of the absorbent layer in Examples 1-5. The absorbent layers in Examples 1-5 are all made of wet-process superabsorbent resin absorbent paper, resulting in low backflow and high dryness. In particular, in some more preferred Examples 1 and Examples 3-5, due to the reasonable design of the absorbent layer and the diamond embossing treatment of the skin-friendly layer, it is even more possible to obtain the dry absorbent product with fast absorption speed and low backflow.

[0102] The present invention also tested the air permeability of the PE film used in Examples 1 and 3-5, and the measured moisture permeability and water pressure resistance results are shown in Table 2; wherein, the moisture permeability was tested in accordance with GB / T1037 standard and the water pressure resistance was tested in accordance with GB / T4744 standard.

[0103] Table 2: Performance test results of the PE films used in Examples 1, 3 to 5.

[0104]

[0105] In Table 2, the symbol " / " indicates that the performance index was not tested. As can be seen from the results in Table 2, the breathable PE film used in Examples 3 to 5 of the present invention has better moisture permeability, especially Example 3, which has the best moisture permeability. Using it as the leak-proof bottom layer of dry absorbent products can give the dry absorbent products very good breathability, which helps to reduce dampness and stuffiness. In addition, the water resistance of Example 3 is still very good, reaching more than 6000Pa, which is far higher than the water pressure resistance index requirement of PE film for sanitary products.

[0106] It should be noted that, in this invention, the terms "upper," "lower," "left," "right," "above," and "below" indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the components 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 the present invention. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0107] The parts of this invention not described in detail are techniques known to those skilled in the art, and those skilled in the art can design according to their needs.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry and absorbent product, characterized in that: The dry and absorbent product comprises, from top to bottom, a skin-friendly layer, an absorbent layer, and a leak-proof bottom layer; The skin-friendly layer comprises a skin-friendly upper layer and a skin-friendly lower layer. The skin-friendly upper layer is made of ES fiber, and the skin-friendly lower layer is made of core-sheath fiber and eccentric fiber, with a mass ratio of core-sheath fiber to eccentric fiber of (5~10):(0.05~3). The hydrophilicity of the skin-friendly upper layer is weaker than that of the skin-friendly lower layer. The surface of the skin-friendly layer is embossed. The embossing is a diamond embossing, with each diamond embossing line having a thickness of 0.1~5mm. Each diamond embossing includes multiple raised diamonds, with an angle of 20~160°. The length of the diamond connection along the longitudinal direction is 0.1~5mm, and the length along the width direction is 0.1~3mm. The ratio of embossing depth to the thickness of the skin-friendly layer is 1:(1~20). The absorbent layer includes a central raised absorbent layer and a non-raised absorbent layer located below the central raised absorbent layer; the central raised absorbent layer and the non-raised absorbent layer are made of wet-process superabsorbent resin absorbent paper; the basis weight of the wet-process superabsorbent resin absorbent paper is 50~150 g / m². 2 The superabsorbent polymer (SAP) content in the wet-process superabsorbent polymer paper is 15-80% by mass; the basis weight ratio of the wet-process superabsorbent polymer paper used in the intermediate raised absorbent layer to that used in the non-raised absorbent layer is (1-3):1; the ratio of the SAP content in the wet-process superabsorbent polymer paper used in the intermediate raised absorbent layer to that in the non-raised absorbent layer is (0.5-2):1; the intermediate raised absorbent layer has multiple first guide slits, and the non-raised absorbent layer has multiple second guide slits. The leak-proof bottom layer is a breathable PE membrane, and the preparation of the breathable PE membrane includes the following steps: (a) Talc powder and water are mixed and stirred under high temperature and high pressure, and then filtered to obtain filter cake. The filter cake is ultrasonically treated with hydrochloric acid and maleic acid solution in sequence, and then filtered, washed, dried and calcined in sequence to obtain pretreated talc powder. (b) Add silane coupling agent and pH adjuster to anhydrous ethanol and stir until homogeneous to obtain a coupling agent solution with pH 4-6; (c) Polyvinyl alcohol is dispersed evenly with water to obtain a polyvinyl alcohol solution. Then, pretreated talc and cationic surfactant are added to the polyvinyl alcohol solution and mixed evenly to obtain a mixture. Then, the coupling agent solution is added to the mixture and stirred to react. After filtration, washing and drying, modified talc is obtained. In step (c), the mass fraction of the polyvinyl alcohol solution is 8~12%, the mass ratio of polyvinyl alcohol, pretreated talc and cationic surfactant in the polyvinyl alcohol solution is (5~15):(80~120):(3~5), and the mass ratio of the mixture to the coupling agent solution is (1~2.5):

1. (d) The linear low-density polyethylene, modified talc, plasticizer, antioxidant and stabilizer are mixed and granulated to obtain masterbatch; in step (d), the mass ratio of the linear low-density polyethylene, modified talc, plasticizer, antioxidant and stabilizer is (120~180):(30~50):(1~4):(1~4):(2~6); (e) After drying the masterbatch, it is sequentially cast into a film and stretched and stabilized to obtain a breathable PE film.

2. The dry absorbent product according to claim 1, characterized in that: The weight of the skin-friendly top layer is 10~30g / m³. 2 ; The weight of the skin-friendly lower layer is 15~30g / m³. 2 ; and / or The skin-friendly lower layer uses fibers with a length of 20-80mm and a fiber diameter of 0.3 denier-10 denier.

3. The dry absorbent product according to claim 1, characterized in that: The length of the middle raised absorbent layer is 0.125 to 1 times the overall length of the dry absorbent product; The width of the raised absorbent layer in the middle is 0.25 to 1 times the overall width of the dry absorbent product.

4. The dry absorbent product according to claim 1, characterized in that: The intermediate raised absorbent layer includes at least one layer of wet-processed superabsorbent resin absorbent paper.

5. The dry absorbent product according to claim 1, characterized in that: The depth of the first guide slit is 0.1 to 1 times the thickness of the intermediate raised absorption layer, and the depth of the second guide slit is 0.1 to 0.75 times the thickness of the non-raised absorption layer.

6. The dry absorbent product according to claim 1, characterized in that: The length of the first guide slit and / or the second guide slit is 1 to 50 mm, the width of the first guide slit is 0.1 to 8 mm, and the width of the second guide slit is 0.1 to 5 mm.

7. The dry absorbent product according to claim 1, characterized in that: The interval between two adjacent first guide slits is 0.1~15mm, and the interval between two adjacent second guide slits is 1~25mm.

8. The dry absorbent product according to claim 7, characterized in that: The interval between two adjacent second guide slots is greater than the interval between two adjacent first guide slots.

9. The dry absorbent product according to claim 1, characterized in that: The angle between the first and / or the second diversion slit and the length direction of the dry absorbent is 30-80°.

10. The dry absorbent product according to claim 1, characterized in that: The absorption layer also includes a covering absorption layer that covers the intermediate protruding absorption layer.

11. The dry absorbent product according to claim 10, characterized in that: The covering absorbent layer includes an upper covering absorbent layer located above the intermediate raised absorbent layer and a lower covering absorbent layer located below the intermediate raised absorbent layer; or the covering absorbent layer covers the lower surface of the intermediate raised absorbent layer, and the covering absorbent layer extends upward from both sides to form folded portions, which cover the upper surface of the intermediate raised absorbent layer, with an opening between the two ends of the folded portions; or the covering absorbent layer covers the upper surface of the intermediate raised absorbent layer, and the covering absorbent layer extends downward from both sides to form folded portions, which cover the lower surface of the intermediate raised absorbent layer, with an opening between the two ends of the folded portions.

12. The dry absorbent product according to claim 11, characterized in that: The width of the opening is 0.1 to 0.9 times the width of the intermediate raised absorption layer.

13. The dry absorbent product according to claim 10, characterized in that: The coating absorbent layer is made of one or more of the following: wet-strength paper, dust-free paper, and wet-process superabsorbent resin paper.

14. The dry absorbent product according to any one of claims 1 to 13, characterized in that: The dry and absorbent product also includes a flow-guiding layer disposed between the skin-friendly layer and the absorbent layer; The flow guiding layer is a non-woven fabric layer.

15. The dry absorbent product according to claim 1, characterized in that: In step (a), the talc powder and water are mixed at a mass ratio of 1:(1.5~2.5), and stirred and reacted at a high temperature and high pressure of 160~200℃ and 1.5~1.8MPa for 50~60min. The mass fraction of the hydrochloric acid is 10~12%, the maleic acid solution is in anhydrous ethanol as solvent, the mass fraction of the maleic acid solution is 20~40%, the ultrasonic treatment time is 2~4h, and / or the calcination is carried out at 800~1000℃ for 1~3h. In step (b), the mass ratio of the anhydrous ethanol to the silane coupling agent is 100:(10~40). In step (c), the polyvinyl alcohol solution has a mass fraction of 8-12%, and the mass ratio of polyvinyl alcohol, pretreated talc powder and cationic surfactant contained in the polyvinyl alcohol solution is (5-15):(80-120):(3-5), and / or the mass ratio of the mixture to the coupling agent solution is (1-2.5):1; In step (c), the temperature of the stirring reaction is 50~80°C, and the stirring reaction time is 1~4 hours; and / or In step (d), the mass ratio of the linear low-density polyethylene, modified talc, plasticizer, antioxidant and stabilizer is (120~180):(30~50):(1~4):(1~4):(2~6).

16. The method for preparing the dry absorbent product according to any one of claims 1 to 15, characterized in that, The preparation method includes the following steps: (1) The upper skin layer is made of ES fiber, and the lower skin layer is made of at least one of the following fibers: core fiber, eccentric fiber, hollow fiber. The upper skin layer and the lower skin layer are combined together to obtain a skin-friendly layer, and the surface of the skin-friendly layer is embossed. (2) The intermediate raised absorption layer is laminated on top of the non-raised absorption layer to obtain the absorption layer; (3) The skin-friendly layer, the absorbent layer and the leak-proof bottom layer are sequentially combined to obtain a dry and absorbent product.

17. The preparation method according to claim 16, characterized in that: In step (2), after the middle protruding absorbent layer is covered with a coating absorbent layer, it is then composited on top of the non-protruding absorbent layer.

18. The preparation method according to claim 16, characterized in that: In step (2), a first guide slit is formed in the middle raised absorption layer and a second guide slit is formed in the non-raised absorption layer.

19. The preparation method according to claim 16, characterized in that: In step (3), a flow-guiding layer is also composited between the skin-friendly layer and the absorbent layer.

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