Bacteriostatic sanitary absorption article and preparation method thereof

Abstract

The invention provides a bacteriostatic sanitary absorption article and a preparation method thereof. The sanitary absorption article comprises a bacteriostatic liquid-permeable surface layer, a flow guide layer, an absorption layer and a breathable bottom layer which are sequentially arranged from top to bottom, wherein the antibacterial liquid-permeable surface layer is formed by mixing and lapping antibacterial fibers, super-absorbent fibers and synthetic fibers in different proportions, and the antibacterial fibers are prepared by dipping a synthetic fiber net into a nano-composite antibacterial agent solution; two concave parts and a convex part are arranged on the surface of the flow guide layer in parallel in the length direction, the convex part is located between the two concave parts, and the top end of the convex part is higher than the bottom surfaces of the concave parts. According to the sanitary absorption article, the antibacterial liquid-permeable surface layer, the flow guide layer and the absorption layer have a synergistic effect, and the performance of efficient liquid absorption, long-acting bacteriostasis, breathability, comfort and lasting dryness of the sanitary absorption article is jointly guaranteed.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, and in particular to an antibacterial absorbent hygiene product and its preparation method. Background Technology

[0002] With the development of the times, consumers' demands for hygiene absorbent products have evolved from simple basic absorption to a comprehensive pursuit of multiple performance characteristics such as instant absorption, instant drying, long-lasting antibacterial effect, breathability, and skin-friendliness. To address this trend, the industry has made many improvements to the traditional structure. However, the surface material in most existing products is still a traditional liquid-permeable layer with a single function. Its antibacterial function is mainly achieved through simple post-processing or internal mixing and addition. This approach results in the antibacterial ingredients being released too quickly, with low efficiency and poor durability. Moreover, it often contradicts the core requirement of rapid liquid permeability of the surface layer, ultimately affecting the dry experience during use.

[0003] Furthermore, existing technologies for guiding and absorbing layers typically rely on increasing material thickness or quantity to improve liquid absorption. This results in poor lateral diffusion of liquid within the absorbent, easily leading to localized saturation while the surrounding absorbent material remains underutilized. This not only severely limits the product's effective absorption capacity but also causes the locked-in liquid to be squeezed back to the surface under pressure, resulting in a damp, sticky, and uncomfortable feeling. Simultaneously, the heavy, layered structure sacrifices the product's overall breathability and softness.

[0004] Therefore, there is an urgent need to provide an antibacterial and hygienic absorbent product and its preparation method. Summary of the Invention

[0005] This invention provides an antibacterial absorbent product and its preparation method, which can solve the problem that existing absorbent products cannot simultaneously possess excellent antibacterial properties, absorbency, and dryness.

[0006] In a first aspect, the present invention provides an antibacterial and hygienic absorbent product, which includes, from top to bottom, an antibacterial and liquid-permeable surface layer, a diversion layer, an absorbent layer, and a breathable bottom layer; wherein, the antibacterial and liquid-permeable surface layer is formed by mixing and laying together antibacterial fibers, superabsorbent fibers and synthetic fibers in different proportions, and the antibacterial fibers are prepared by impregnating a synthetic fiber web with a nanocomposite antibacterial agent; The surface of the flow guide layer is provided with two recesses and one protrusion parallel to each other along the length direction. The protrusion is located between the two recesses, and the top of the protrusion is higher than the bottom surface of the recesses.

[0007] Preferably, the antibacterial fiber is prepared by the following method: (11) Add organic antibacterial agent, inorganic antibacterial agent, anti-inflammatory soothing agent, antioxidant, pH adjuster and barrier repair agent to water and mix by ultrasonication to obtain nanocomposite antibacterial agent solution; (12) The synthetic fiber is opened and broken to form a fiber web, and then the fiber web is sequentially immersed in the first nanocomposite antibacterial agent solution, the second nanocomposite antibacterial agent solution and the third nanocomposite antibacterial agent solution. After drying and curing, the antibacterial fiber is obtained.

[0008] Preferably, the concentration of the second nanocomposite antibacterial agent solution is greater than the concentration of the first nanocomposite antibacterial agent solution, and the third nanocomposite antibacterial agent solution further includes a silane coupling agent.

[0009] More preferably, the concentration of the second nanocomposite antibacterial agent solution is 2 to 5 times that of the first nanocomposite antibacterial agent solution, and the amount of silane coupling agent added is 0.1 to 0.5% of the nanocomposite antibacterial agent.

[0010] Preferably, in step (11), the organic antibacterial agent is quaternized chitosan, the inorganic antibacterial agent is nano-silver oxide, the anti-inflammatory and soothing agent is dipotassium glycyrrhizate, the antioxidant includes tea polyphenols and blackcurrant powder, the pH adjuster is lactic acid, and the barrier repair agent includes panthenol and collagen.

[0011] Preferably, by weight, the organic antibacterial agent is 0.1-0.5 parts, the inorganic antibacterial agent is 0.05-0.5 parts, the anti-inflammatory and soothing agent is 0.2-2 parts, the antioxidant is 0.55-10.2 parts, the pH adjuster is 0.5-1.0 parts, the barrier repair agent is 0.8-17 parts, and the water is 200-500 parts.

[0012] Preferably, the synthetic fiber is polypropylene fiber or polyethylene terephthalate fiber; the superabsorbent fiber is SAF superabsorbent fiber.

[0013] Preferably, the antibacterial and liquid-permeable surface layer is composed of three layers of fiber mesh laid sequentially from top to bottom; wherein, the first layer of fiber mesh is formed by laying a mixture of antibacterial fibers and synthetic fibers; the second layer of fiber mesh is formed by laying a mixture of antibacterial fibers, super absorbent fibers and synthetic fibers; and the third layer of fiber mesh is formed by laying a mixture of super absorbent fibers and synthetic fibers.

[0014] Preferably, by mass percentage, the first layer of fiber web comprises 50-60% antibacterial fiber and 40-50% synthetic fiber; the second layer of fiber web comprises 20-40% antibacterial fiber, 40-50% superabsorbent fiber, and 10-20% synthetic fiber; and the third layer of fiber web comprises 60-70% superabsorbent fiber and 30-40% synthetic fiber.

[0015] Preferably, the depth of the recessed portion is 0.5~3mm and the width is 5~15mm; the height of the protrusion is 2~4mm and the width is 10~30mm.

[0016] More preferably, the central region of the protrusion is provided with a hollow three-dimensional protrusion, which is used to guide the liquid to seep and diffuse downwards; The outer diameter of the three-dimensional boss gradually decreases from top to bottom along the vertical direction, and the bottom end of the three-dimensional boss is a closed end.

[0017] Preferably, the cross-sectional shape of the three-dimensional boss is an inverted trapezoid or an arc, with an inner diameter of 1~4mm at the top and 0.5~2mm at the bottom.

[0018] Preferably, the height of the three-dimensional boss is 2.2~4.5mm, and the thickness of the closed end is 0.5~0.8mm.

[0019] Preferably, the center of the closed end is provided with a flow guide hole, and the diameter of the flow guide hole is 0.5~1.5mm.

[0020] Preferably, the central region of the absorption layer is provided with a raised conical guide column and several concentric annular guide grooves distributed around the conical guide column.

[0021] More preferably, the outer diameter of the conical guide column gradually increases from top to bottom along the vertical direction.

[0022] More preferably, the height of the conical guide column is 1~3mm, the top diameter is 0.3~2mm, and the bottom diameter is 1~4mm.

[0023] More preferably, the depth of the annular guide groove is 0.2~2mm, the width is 0.5~3mm, and the distance between two adjacent guide grooves is 1~3mm.

[0024] Preferably, the flow guiding layer is made of polyurethane foam; the absorbent layer is composed of at least one layer of wet-processed superabsorbent resin composite paper; and the breathable bottom layer is composed of at least one layer of water-repellent non-woven fabric or PE breathable membrane.

[0025] Secondly, embodiments of the present invention also provide a method for preparing the antibacterial and hygienic absorbent product according to any one of the first aspects, the method comprising the following steps: (1) The prepared antibacterial fiber is mixed with synthetic fiber and super absorbent fiber in proportion, and then opened in sections by a partition opening machine and combed to form a three-layer fiber web; (2) The three-layer fiber mesh is heated and cooled to solidify to obtain the antibacterial and liquid-permeable surface layer; preferably, the heating temperature is 135~150℃ and the time is 1~3s; (3) The antibacterial and liquid-permeable surface layer, the diversion layer, the absorption layer and the breathable bottom layer are compounded in sequence to obtain the antibacterial and hygienic absorbent product.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects: In this invention, antibacterial fibers are first prepared by impregnating a synthetic fiber web with a self-made nanocomposite antibacterial agent. Then, the antibacterial fiber web is mixed with superabsorbent fibers and synthetic fibers in a specific ratio and laid into a web to form an antibacterial and liquid-permeable surface layer. This structure allows the antibacterial agent components to be firmly bound to the inside of the fibers, which is conducive to achieving a long-lasting and low-irritation antibacterial effect. In addition, the introduced superabsorbent fibers can instantly absorb liquid, giving the surface layer both rapid liquid permeability and a dry surface. At the same time, by adjusting the proportion and distribution of different functional fibers, the liquid is guided to quickly seep down, improving the overall absorption speed and anti-backflow effect. Meanwhile, the surface of the diversion layer features two recesses along its length and a raised portion between them, forming a three-dimensional concave-convex-concave structure. When liquid permeates from the surface layer into the diversion layer, the recesses on both sides quickly capture and guide the liquid longitudinally, achieving rapid diversion of the liquid to the absorbent layer and preventing local accumulation, thereby improving absorption speed and utilization. The raised portion in the middle better conforms to the curves of the human body for a closer fit, enhancing comfort while working in conjunction with the recesses to guide the liquid flow and prevent it from seeping to the edges. Ultimately, the antibacterial and permeable surface layer, the diversion layer, and the absorbent layer work together to ensure the high-efficiency liquid absorption, long-lasting antibacterial effect, breathability, comfort, and lasting dryness of the hygiene absorbent product. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an antibacterial and hygienic absorbent product provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of another antibacterial and hygienic absorbent product provided in an embodiment of the present invention; Figure 3 This is a top view schematic diagram of the absorbent layer in an antibacterial and hygienic absorbent product provided in an embodiment of the present invention; In the diagram, 100-antibacterial and permeable surface layer, 200-flow guiding layer, 300-absorbent layer, 400-breathable bottom layer, 201-protrusion, 202-recess, 2011-three-dimensional boss, 2022-flow guiding hole, 301-conical flow guiding column, 302-annular flow guiding groove. Detailed Implementation

[0029] 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 with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, this embodiment of the invention provides an antibacterial and hygienic absorbent product, which includes, from top to bottom, an antibacterial and liquid-permeable surface layer 100, a diversion layer 200, an absorbent layer 300, and a breathable bottom layer 400; wherein, the antibacterial and liquid-permeable surface layer 100 is formed by mixing and laying together antibacterial fibers, superabsorbent fibers, and synthetic fibers in different proportions, and the antibacterial fibers are prepared by impregnating a synthetic fiber web with a nanocomposite antibacterial agent; The surface of the flow guiding layer 200 is provided with two recessed portions 202 and one protruding portion 201 parallel to each other along the length direction. The protruding portion 201 is located between the two recessed portions 202, and the top of the protruding portion 201 is higher than the bottom surface of the recessed portion 202.

[0031] In this embodiment of the invention, antibacterial fibers are first prepared by impregnating a synthetic fiber web with a self-made nanocomposite antibacterial agent. Then, the antibacterial fiber web is mixed with superabsorbent fibers and synthetic fibers in a specific ratio and laid into a web to form an antibacterial and liquid-permeable surface layer 100. This structure allows the antibacterial agent components to be firmly bound to the inside of the fibers, which is conducive to achieving a long-lasting and low-irritation antibacterial effect. In addition, the introduced superabsorbent fibers can instantly absorb liquid, giving the surface layer both rapid liquid permeability and a dry surface. At the same time, by adjusting the proportion and distribution of different functional fibers, the liquid is guided to quickly seep down, improving the overall absorption speed and anti-backflow effect. Meanwhile, the surface of the diversion layer 200 is provided with two recesses 202 along its length and a protrusion 201 between them, forming a concave-convex-concave three-dimensional structure. When liquid permeates from the surface layer to the diversion layer, the recesses 202 on both sides can quickly capture and guide the liquid longitudinally, realizing rapid diversion of liquid to the absorbent layer, avoiding local accumulation, thereby improving absorption speed and utilization. The protrusion 201 in the middle can better conform to the curve of the human body to achieve a closer fit, enhancing comfort while working with the recesses 202 to guide the liquid flow and prevent it from seeping to the edges. Finally, the antibacterial and liquid-permeable surface layer 100, the diversion layer 300, and the absorbent layer 300 work together to ensure the high-efficiency liquid absorption, long-lasting antibacterial effect, breathability, comfort, and long-lasting dryness of the sanitary absorbent product.

[0032] In this invention Figure 1 and Figure 2 In this invention, the structural layers are peeled off from each other. This is to clearly show the positional relationship between the structural layers in this invention. However, it should be understood that the structural layers in this invention are actually tightly attached and / or partially attached.

[0033] According to some preferred embodiments, the antibacterial fiber is prepared by the following method: (11) Add organic antibacterial agent, inorganic antibacterial agent, anti-inflammatory soothing agent, antioxidant, pH adjuster and barrier repair agent to water and stir and mix with ultrasonically to obtain nanocomposite antibacterial agent solution; (12) The synthetic fiber is opened and dispersed to form a fiber web, and then the fiber web is sequentially immersed in the first nanocomposite antibacterial agent solution, the second nanocomposite antibacterial agent solution and the third nanocomposite antibacterial agent solution. After drying and curing, the antibacterial fiber is obtained. In this embodiment of the invention, when preparing the nanocomposite antibacterial agent, the inorganic antibacterial agent is first added to water and ultrasonically dispersed to ensure that the nanoparticles form a stable primary dispersion. Then, a pH adjuster is added to adjust the solution to a weakly acidic environment (e.g., pH 5.5-6.0), which not only facilitates the stable coexistence of multiple components and fully exerts the antibacterial effect, but also allows for the addition of water-soluble components such as organic antibacterial agents and antioxidants, ensuring their complete dissolution or dispersion in the system. Finally, a macromolecular barrier repair agent is added and mixed under mild conditions (e.g., stirring at 200-300 rpm) to protect its molecular structure and biological activity from damage. The resulting nanocomposite antibacterial agent is then placed in a vacuum environment with a vacuum degree of 0.08-0.09 MPa for 10-15 minutes to completely remove air bubbles from the liquid, preventing pore defects on the fiber surface due to residual air bubbles during subsequent impregnation processes, thereby ensuring a uniform loading of the nanocomposite antibacterial agent on the fiber.

[0034] According to some preferred embodiments, before opening the synthetic fiber, the process further includes a step of plasma modification treatment of the synthetic fiber.

[0035] In this embodiment of the invention, before impregnating the synthetic short fibers with the composite nano antibacterial agent solution, they are first subjected to plasma surface modification treatment. This facilitates the effective introduction of active groups such as hydroxyl and carboxyl groups onto the fiber surface, thereby significantly enhancing the physical adsorption capacity of the fiber surface for the subsequent nano composite antibacterial agent.

[0036] According to some preferred embodiments, before impregnating the fiber web with the nanocomposite antibacterial agent solution, a pretreatment step is further included; wherein the pretreatment solution is a lanolin alcohol solution with a mass concentration of 1~2% (for example, it can be 1%, 1.5% or 2%).

[0037] According to some preferred embodiments, the concentration of the second nanocomposite antibacterial agent solution is greater than the concentration of the first nanocomposite antibacterial agent solution, and the third nanocomposite antibacterial agent solution also includes a silane coupling agent. The concentration of the second nanocomposite antibacterial agent solution is 2 to 5 times that of the first nanocomposite antibacterial agent solution (for example, it can be 2 times, 3 times, 4 times or 5 times), and the amount of silane coupling agent added is 0.1 to 0.5% of the composite antibacterial agent (for example, it can be 0.1%, 0.2%, 0.3%, 0.4% or 0.5%).

[0038] In this embodiment of the invention, after the modified synthetic fiber is opened and dispersed to form a uniform fiber web, it is first immersed in lanolin alcohol solution for 2-3 minutes for skin-friendly pretreatment, so as to significantly improve the skin-friendliness and lubricity of the fiber surface and effectively reduce friction and irritation during use. Subsequently, a staged impregnation method was adopted to optimize the loading effect of the nanocomposite antibacterial agent. First, the fiber web was immersed in a low concentration of the first nanocomposite antibacterial agent for 5-10 minutes to fully wet the fibers and remove air from the gaps. Then, it was transferred to a high concentration of the second composite antibacterial agent for 15-20 minutes to ensure that sufficient antibacterial components effectively adhered and penetrated. Finally, it was impregnated again in a nanocomposite antibacterial agent containing a silane coupling agent for 5-10 minutes to strengthen the interfacial bonding through coupling. After impregnation, the fiber web was first dried with hot air at 60-70℃ for 20-30 seconds to achieve gentle shaping, and then cured at a constant temperature of 80-90℃ for 10-15 seconds. This ensures that the nanocomposite antibacterial agent is firmly bonded to the fiber, thereby improving the durability of antibacterial properties and user comfort.

[0039] According to some preferred embodiments, in step (11), the organic antibacterial agent is quaternized chitosan, the inorganic antibacterial agent is nano-silver oxide, the anti-inflammatory and soothing agent is dipotassium glycyrrhizate, the antioxidant includes tea polyphenols and blackcurrant powder, and the mass ratio of tea polyphenols to blackcurrant powder is preferably (0.05~0.2):(0.5~10); the pH adjuster is lactic acid, and the barrier repair agent includes panthenol and collagen, and the mass ratio of panthenol to collagen is preferably (0.5~10):(0.3~7).

[0040] According to some preferred embodiments, the organic antibacterial agent is 0.1 to 0.5 parts by weight (e.g., 0.1, 0.2, 0.3, 0.4, or 0.5 parts), the inorganic antibacterial agent is 0.05 to 0.5 parts by weight (e.g., 0.05, 0.1, 0.2, 0.3, 0.4, or 0.5 parts), and the anti-inflammatory soothing agent is 0.2 parts by weight. ~2 parts (e.g., 0.2, 0.5, 0.8, 1.0, 1.5 or 2 parts), antioxidant 0.55 to 10.2 parts (e.g., 0.55, 0.6, 1, 2, 3, 5, 8, 10 or 10.2 parts), pH adjuster 0.5 to 1.0 parts (e.g., 0.5, 0.6, 0.7, 0.8, 0.9 or 1 part), barrier repair agent 0.8 to 17 parts (e.g., 0.8, 1, 3, 5, 8, 10, 12, 15 or 17 parts), water 200 to 500 parts (e.g., 200, 300, 400 or 500 parts).

[0041] In this embodiment of the invention, by scientifically compounding the above-mentioned organic antibacterial agents, inorganic antibacterial agents, anti-inflammatory soothing agents, antioxidants, pH adjusters, and barrier repair agents, and through synergistic control of the proportions of each component, a synergistic nanocomposite antibacterial agent is formed. Specifically, the inorganic antibacterial agent can form a complementary mechanism with the organic antibacterial agent. The organic antibacterial agent first disrupts the bacterial cell membrane structure, making it easier for the inorganic antibacterial agent to enter the cell and interfere with its metabolism, achieving synergistic bactericidal efficiency. The pH adjuster can regulate the local microenvironment to a healthy, slightly acidic state, directly inhibiting the activity of harmful bacteria while promoting better action of other active ingredients on the skin. The cationic film formed by the organic antibacterial agent can effectively lock in barrier repair agents such as collagen and panthenol, as well as antioxidants such as tea polyphenols, significantly reducing the loss of active ingredients and prolonging the duration of action. Simultaneously, the anti-inflammatory soothing agent and the antioxidant synergistically construct an anti-irritant and stable microenvironment. In this way, the final nanocomposite antibacterial agent solution can synergistically achieve six major effects at low concentrations: broad-spectrum antibacterial, deep moisturizing, barrier repair, anti-oxidation, anti-inflammatory soothing, and weak acid stabilization. It is also gentle and non-irritating, with high ingredient utilization and long-lasting effects.

[0042] According to some preferred embodiments, the synthetic fiber is polypropylene fiber or polyethylene terephthalate fiber; the superabsorbent fiber is SAF superabsorbent fiber; the antibacterial and liquid-permeable surface layer is composed of three layers of fiber web laid sequentially from top to bottom; wherein, the first layer of fiber web is formed by laying a mixture of antibacterial fiber and synthetic fiber; the second layer of fiber web is formed by laying a mixture of antibacterial fiber, superabsorbent fiber and synthetic fiber; and the third layer of fiber web is formed by laying a mixture of superabsorbent fiber and synthetic fiber.

[0043] According to some preferred embodiments, by weight percentage, the antibacterial fiber is 50-60% (e.g., 50%, 52%, 55%, 58%, or 60%), and the synthetic fiber is 40-50% (e.g., 40%, 42%, 45%, 48%, or 50%); in the second fiber web, the antibacterial fiber is 20-40% (e.g., 20%, 25%, 30%, 35%, or 40%), the superabsorbent fiber is 40-50% (e.g., 40%, 42%, 45%, 48%, or 50%), and the synthetic fiber is 10-20% (e.g., 10%, 12%, 15%, 18%, or 20%); in the third fiber web, the superabsorbent fiber is 60-70% (e.g., 60%, 62%, 65%, 68%, or 70%), and the synthetic fiber is 30-40% (e.g., 30%, 32%, 35%, 38%, or 40%).

[0044] In this embodiment of the invention, a three-layer gradient composite antibacterial and permeable surface layer is constructed by precisely controlling the proportion and distribution of synthetic fibers, antibacterial fibers, and superabsorbent fibers. Specifically, the first layer is formed by mixing and laying a web of antibacterial fibers and synthetic fibers. The synthetic fibers are preferably fine denier (1.5~2.0 dtex) polypropylene short fibers, which helps to ensure a good liquid conduction rate and skin-friendly feel on the surface layer. The second layer is formed by mixing and laying a web of superabsorbent fibers, antibacterial fibers, and synthetic fibers in a certain proportion, which helps to significantly improve the overall absorption capacity and water-locking ability, effectively avoiding premature saturation of the bottom layer caused by excessive liquid seepage. The third layer, as a support and seepage-proof layer, is preferably made of a composite of high-strength polyethylene terephthalate fibers and superabsorbent fibers. Its rigid skeleton can resist the swelling stress of the fiber web after wetting, preventing the structure from loosening or deforming, thereby vertically locking the liquid in the middle layer and ensuring excellent anti-backflow performance. In this way, the functions of each layer are clearly defined and they work together, ultimately giving the antibacterial and permeable surface layer the properties of rapid liquid conduction, strong water retention, and stable anti-backflow performance.

[0045] According to some preferred embodiments, the depth of the recessed portion 202 is 0.5~3mm (for example, it can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm), and the width is 5~15mm (for example, it can be 5mm, 8mm, 10mm, 12mm or 15mm); the height of the protrusion 201 is 2~4mm (for example, it can be 2mm, 3mm or 4mm), and the width is 10~30mm (for example, it can be 10mm, 15mm, 20mm, 25mm or 30mm).

[0046] In this embodiment of the invention, by reasonably setting the depth and width of the recessed portion 202 in the flow guiding layer 200, it is beneficial to optimize the efficiency of longitudinal diversion and lateral blocking of the flow guiding layer 200. Furthermore, by reasonably setting the height and width of the protrusion 201, it can generate appropriate deformation under pressure, dynamically adapt to the curve of the human body, and achieve stable fit.

[0047] It should be noted that the specific shape of the cross-section of the protrusion 201 and the recess 202 is not specifically limited in this invention. For example, it can be rectangular or cylindrical. The height of the protrusion 201 is the distance from the top of the protrusion 201 to the reference surface of the guide layer 200.

[0048] According to some preferred embodiments, the central region of the protrusion 201 is provided with a hollow three-dimensional protrusion 2011, which is used to guide the downward diffusion of liquid; the outer diameter of the three-dimensional protrusion 2011 gradually decreases from top to bottom in the vertical direction, and the bottom end of the three-dimensional protrusion 2011 is a closed end; preferably, the cross-sectional shape of the three-dimensional protrusion 2011 is an inverted trapezoid or an arc, with an inner diameter of 1~4mm at the top (for example, 1mm, 2mm, 3mm or 4mm) and an inner diameter of 0.5~2mm at the bottom (for example, 0.5mm, 1mm, 1.5mm or 2mm).

[0049] In this embodiment of the invention, the central region of the protrusion 201 is provided with a hollow three-dimensional protrusion 2011, the outer diameter of which decreases in a gradient from top to bottom in the vertical direction, and its cross-sectional shape is an inverted trapezoid or arc. By controlling the inner diameter of the top end and the outer diameter of the bottom end of the three-dimensional protrusion 2011, its bottom is made into a closed structure, communicating with the outside only through the top opening of the internal hollow cavity. In this way, when liquid seeps down from the permeable surface layer to the flow guiding layer 200, it can first be collected in the hollow cavity of the three-dimensional protrusion 2011. Subsequently, under the guidance of the side wall of the three-dimensional protrusion 2011 and its own gravity, the liquid diffuses evenly and controllably along the outer surface of the three-dimensional protrusion 2011 to the surrounding protrusions 201 and the grooves on both sides. This not only avoids the disorderly flow of liquid on the surface of the flow guiding layer 200, but also makes the liquid distribution more extensive by slowing down the vertical seepage speed and strengthening the lateral guidance.

[0050] According to some preferred embodiments, the height of the three-dimensional boss 2011 is 2.2~4.5mm (for example, it can be 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.8mm, 4.0mm or 4.5mm), and the thickness of the closed end is 0.5~0.8mm (for example, it can be 0.5mm, 0.6mm, 0.7mm or 0.8mm); a guide hole 2022 is provided at the center of the closed end, and the diameter of the guide hole 2022 is 0.5~1.5mm (for example, it can be 0.5mm, 0.8mm, 1.0mm, 1.2mm or 1.5mm).

[0051] In this embodiment of the invention, the height of the three-dimensional boss 2011 is the height excluding the thickness of the closed end, and it is basically the same as the overall height of the protrusion 201. This not only helps maintain the overall flatness and structural continuity of the upper surface of the guide layer 200, but also enables efficient liquid guidance without increasing the thickness. Furthermore, to further optimize the liquid absorption performance, one or more guide holes 2022 are provided in the central area of ​​the bottom closed end. These guide holes 2022 penetrate the closed end and are connected to the hollow cavity of the three-dimensional boss 2011. This facilitates the controllable vertical infiltration of liquid in the hollow cavity. When the liquid in the hollow cavity accumulates to a certain amount, it can be quickly guided to the lower antibacterial and deodorizing layer or absorption layer 300 through the guide holes 2022. It can also form a three-dimensional diversion network with the diffusion effect of the sidewall of the three-dimensional boss 2011, preventing liquid from stagnating in the hollow cavity, thereby significantly improving the diversion efficiency and overall liquid absorption speed.

[0052] According to some preferred embodiments, the central region of the absorption layer 300 is provided with a raised conical guide column 301 and a plurality of concentric annular guide grooves 302 distributed around the conical guide column 301; the outer diameter of the conical guide column 301 gradually increases from top to bottom in the vertical direction; the height of the conical guide column 301 is 1~3mm (e.g., 1mm, 2mm or 3mm), the top diameter is 0.3~2mm (e.g., 0.3mm, 0.5mm, 1mm, 1.5mm or 2mm), and the bottom diameter is 1~4mm (e.g., ...). The depth of the annular flow guide groove 302 is 0.2~2mm (e.g., 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 1.8mm or 2mm), and the width is 0.5~3mm (e.g., 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm). The spacing between two adjacent flow guide grooves 302 is 1~3mm (e.g., 1mm, 1.5mm, 2mm, 2.5mm or 3mm).

[0053] In this embodiment of the invention, a conical guide column 301 is provided in the central region of the absorption layer 300, corresponding to the protrusion 201 of the guide layer 200. The outer diameter of the conical guide column 301 gradually increases from top to bottom in the vertical direction. When liquid seeps into the absorption layer 300, the conical guide column 301 can actively absorb and rapidly diffuse the liquid from the upper layer. Furthermore, by adapting the shape of the top of the conical guide column 301 to the inner wall contour of the bottom of the three-dimensional protrusion 2011, the flow can be guided effectively. The three-dimensional protrusion 2011 of layer 200 and the conical guide column 301 of absorbent layer 300 cooperate to form a liquid transfer interface. The liquid gathered in the cavity of the three-dimensional protrusion 2011 of guide layer 200 can be instantly captured by the conical guide column 301 in absorbent layer 300 through the bottom guide hole 2022 or directly through the micro gap. Then, it quickly diffuses downward and around along the side wall of conical guide column 301, thereby further improving the overall absorption speed, leak-proof reliability and core utilization of the sanitary absorbent product.

[0054] Furthermore, by setting several concentric annular guide grooves 302 around the conical guide column 301, when a large amount of liquid seeps into the absorbent layer 300, it is first received by the top of the conical guide column 301. Under capillary action, the liquid quickly flows downward and diffuses in all directions along the surface of the guide column. After reaching the bottom, it is immediately captured by the annular guide grooves 302 around the conical guide column 301 and guided to diffuse along its path by the annular guide grooves 302, thereby quickly distributing the liquid flow to other areas in the absorbent layer 300. In this way, excessive accumulation of liquid in the central area of ​​the absorbent layer 300 is effectively avoided, improving the overall utilization rate and uniformity of liquid distribution of the absorbent layer 300, and further enhancing the absorption speed and anti-backflow capability of the sanitary absorbent products.

[0055] According to some preferred embodiments, the flow guiding layer 200 is made of polyurethane foam; the absorbent layer 300 is composed of at least one layer of wet-processed superabsorbent resin composite paper; and the breathable bottom layer 400 is at least one layer of water-repellent nonwoven fabric or PE breathable membrane.

[0056] In this embodiment of the invention, the absorbent layer 300 is made of multi-layer wet-process superabsorbent resin absorbent paper. This material can absorb and retain liquid in the first instance, ensuring the dryness of the surface. The basis weight of each layer of superabsorbent resin absorbent paper is 30~300g / m². 2 Preferably 70~150g / m 2 The conical guide column 301 is formed by molding fluff pulp fiber and is bonded to the absorbent layer 300 by hot melt adhesive.

[0057] This invention also provides a method for preparing an antibacterial and absorbent product using any of the above-described methods, the method comprising the following steps: (1) The prepared antibacterial fiber is mixed with synthetic fiber and super absorbent fiber in proportion, and then opened in sections by a partition opening machine and combed to form a three-layer fiber web; (2) The three-layer fiber mesh is heated and cooled to solidify to obtain the antibacterial and liquid-permeable surface layer; preferably, the heating temperature is 135~150℃ (for example, it can be 135℃, 140℃, 145℃ or 150℃), and the time is 1~3s (for example, it can be 1s, 2s or 3s).

[0058] (3) The antibacterial and liquid-permeable surface layer, the diversion layer, the absorption layer and the breathable bottom layer are compounded in sequence to obtain the antibacterial and hygienic absorbent product.

[0059] In this embodiment of the invention, the prepared antibacterial fibers are mixed with synthetic fibers and superabsorbent fibers in a specific ratio, and a zoned opening machine is used to achieve precise mixing and layering of the fibers, forming a fiber web with a three-layer gradient structure. Subsequently, the fiber web is combed, preferably using an electrostatic field (20~30kV), to ensure uniform and dense fiber arrangement, resulting in a structurally stable three-layer fiber web. Finally, after the three-layer fiber web is heated and melted to bond, it is immediately cooled and shaped rapidly through a 25°C cold air circulation system, thereby significantly improving curing efficiency and dimensional stability, ultimately producing an antibacterial and liquid-permeable surface layer. This surface layer is then sequentially combined with a flow-guiding layer with a concave-convex-concave three-dimensional flow-guiding structure, an absorbent layer with conical flow-guiding columns, and a breathable bottom layer to obtain an antibacterial and hygienic absorbent product.

[0060] To more clearly illustrate the technical solution and advantages of the present invention, the following examples provide a detailed description of an antibacterial and hygienic absorbent product and its preparation method; in the following examples, the content of each component is expressed in parts by mass.

[0061] Example 1: (1) Preparation of antibacterial fibers: (11) Add 0.5 parts of inorganic antibacterial agent (nano silver oxide) to 300 parts of deionized water and ultrasonically disperse for 5 min. Then, under ultrasonic conditions, add 1 part of pH adjuster (lactic acid), 0.5 parts of organic antibacterial agent (quaternized chitosan), and 5.2 parts of antioxidant (0.2 parts of tea polyphenols and 5 parts of blackcurrant powder). After turning off the ultrasonic treatment, add 10 parts of barrier repair agent (5 parts of panthenol and 5 parts of collagen) and stir at 300 rpm to obtain the second nanocomposite antibacterial agent solution. Two more nanocomposite antibacterial solutions were prepared using the same method. One of the nanocomposite antibacterial solutions was diluted twice with deionized water to obtain the first nanocomposite antibacterial solution. 0.1% of a silane coupling agent (KH550) was added to the other nanocomposite antibacterial solution and stirred until homogeneous to obtain the third nanocomposite antibacterial solution. The obtained nanocomposite antibacterial solutions were then degassed under a vacuum of 0.08 MPa for 10 minutes and set aside for later use. (12) The synthetic short fibers (50~100mm polypropylene short fibers) are fed into the plasma treatment machine. The argon and oxygen mixed gas with a volume ratio of 3:1 is used to treat the fibers for 3 minutes at a plasma power of 80W. The synthetic fibers are then opened and broken into a fiber web. The fibers are first immersed in a 1% lanolin alcohol solution for 2 minutes for skin-friendly pretreatment. After drying at 60℃ for 3 minutes, the fiber web is immersed in the first nanocomposite antibacterial agent solution for 5 minutes, the second nanocomposite antibacterial agent solution for 20 minutes, and the third nanocomposite antibacterial agent solution for 5 minutes. After immersion, the fiber web is first dried in a 60℃ oven with hot air for 20 seconds, and then cured at 80℃ for 10 seconds to obtain antibacterial fibers. First, 70 wt% of superabsorbent fiber (SAF superabsorbent fiber) and 30 wt% of synthetic fiber (polyethylene terephthalate fiber) are mixed (third layer). Then, 30 wt% of antibacterial fiber, 20 wt% of synthetic fiber (polypropylene short fiber) and 50 wt% of superabsorbent fiber (SAF superabsorbent fiber) are mixed on top (second layer). Then, 60 wt% of antibacterial fiber and 40 wt% of synthetic fiber (1.5 dex, 50~100 mm polypropylene short fiber) are mixed on top (first layer). Each layer is mixed and laid out using a partitioned opening machine. Then, it is fed into a carding machine and an electrostatic field (20 kV) is applied to obtain a structurally stable three-layer fiber web. Finally, the three-layer fiber web is heated and melted at 135°C for 3 seconds, and then immediately cooled and shaped by a 25°C cold air circulation to obtain an antibacterial and liquid-permeable surface layer. (2) The structure of the flow-guiding layer is designed, and then the antibacterial and liquid-permeable surface layer (the third layer is attached to the flow-guiding layer), the flow-guiding layer (polyurethane foam material), the absorbent layer (four layers of super absorbent resin composite paper) and the breathable bottom layer (PE film) are composited in sequence to obtain antibacterial and hygienic absorbent products; wherein, the surface of the flow-guiding layer is provided with two recesses and one protrusion along the length direction, which extend parallel along the length direction, the protrusion is located between the two recesses, and the top of the protrusion is higher than the bottom of the recesses. The depth of the recesses is 1mm and the width is 5mm, the height of the protrusion is 4mm and the width is 20mm.

[0062] Example 2: Example 2 is basically the same as Example 1, except that in step (2), the central area of ​​the protrusion of the guide layer is provided with a hollow three-dimensional protrusion. The outer diameter of the three-dimensional protrusion gradually decreases from top to bottom in the vertical direction, and the bottom end of the three-dimensional protrusion is a closed end. The cross-sectional shape is an inverted trapezoid, the inner diameter of the top end is 3mm, the inner diameter of the bottom end is 1mm, the height of the three-dimensional protrusion is 3.2mm, the thickness of the closed end is 0.8mm, and the center of the closed end of the bottom end of the three-dimensional protrusion is provided with a guide hole with a diameter of 1mm.

[0063] Example 3 Example 3 is basically the same as Example 2, except that in step (2), the central region of the absorption layer is composite with a raised conical guide column (formed by molding with fluff pulp). The outer diameter of the conical guide column gradually increases from top to bottom in the vertical direction. The height of the conical guide column is 2mm, the top diameter is 1mm, and the bottom diameter is 3mm.

[0064] Example 4 Example 4 is basically the same as Example 3, except that in step (2), the absorption layer is provided with 3 concentric annular flow guide grooves. The annular flow guide grooves are distributed around the conical flow guide column. The depth of the annular flow guide groove is 2mm, the width is 1mm, and the distance between two adjacent flow guide grooves is 2mm.

[0065] Example 5 Example 5 is basically the same as Example 1, except that in step (1), the nanocomposite antibacterial agent solution does not contain inorganic antibacterial agents, that is, it is obtained by mixing 1 part pH adjuster (lactic acid), 1 part organic antibacterial agent (quaternized chitosan), 5.2 parts antioxidant (0.2 parts tea polyphenols and 5 parts blackcurrant powder), 10 parts barrier repair agent (5 parts panthenol and 5 parts collagen) and 300 parts deionized water.

[0066] Example 6 Example 6 is basically the same as Example 1, except that in step (1), the nanocomposite antibacterial agent solution does not contain a pH adjuster, that is, it is only obtained by mixing 0.5 parts of inorganic antibacterial agent (nano silver oxide), 300 parts and 0.5 parts of organic antibacterial agent (quaternized chitosan), 6.2 parts of antioxidant (0.2 parts of tea polyphenols and 6 parts of blackcurrant powder), and 10 parts of barrier repair agent (5 parts of panthenol and 5 parts of collagen).

[0067] Example 7 Example 7 is basically the same as Example 1, except that in step (1), during the preparation of antibacterial fibers, the synthetic fibers are impregnated three times with the second nanocomposite antibacterial agent solution.

[0068] Example 8 Example 8 is basically the same as Example 1, except that in step (1), the synthetic fiber was not pretreated with plasma during the preparation of antibacterial fiber.

[0069] Example 9 Example 9 is basically the same as Example 1, except that in step (1), during the preparation of the antibacterial and liquid-permeable surface layer, the three-layer structure is formed by mixing and laying 30wt% antibacterial fiber, 50wt% synthetic fiber (polypropylene short fiber) and 20wt% super absorbent fiber (SAF super absorbent fiber).

[0070] Example 10 Example 10 is basically the same as Example 1, except that in step (2), the first layer of the antibacterial permeable surface layer is attached to the flow guiding layer.

[0071] Comparative Example 1 Comparative Example 1 is basically the same as Example 1. In step (1), 0.5 parts of inorganic antibacterial agent (nano silver oxide) were added to 300 parts of deionized water and ultrasonically dispersed for 5 minutes. Then, under ultrasonic conditions, 1 part of pH adjuster (lactic acid), 0.5 parts of organic antibacterial agent (quaternized chitosan), and 5.2 parts of antioxidant (0.2 parts of tea polyphenols and 5 parts of blackcurrant powder) were added in sequence. After turning off the ultrasonic treatment, 10 parts of barrier repair agent (5 parts of panthenol and 5 parts of collagen) were added and stirred at 300 rpm to obtain a composite nano antibacterial agent solution with the same composition as Example 1. Subsequently, the antibacterial agent solution was loaded onto the surface of hot air nonwoven fabric by spraying and dried at 60°C to obtain an antibacterial and liquid-permeable surface layer.

[0072] Comparative Example 2 Comparative Example 2 is basically the same as Example 1, except that in step (2), no protrusions and depressions are provided on the guide layer.

[0073] The performance of the antibacterial hygiene absorbent samples (hereinafter referred to as samples) provided in the examples and comparative examples was tested, and the test results are shown in Table 1 below: 20-minute antibacterial rate test: (1) Preparation of test strains: Select the specified standard strains (Escherichia coli, Staphylococcus aureus and Candida albicans) and prepare them at a concentration of 1×10 5A bacterial suspension of ~1×100 CFU / mL was prepared. Samples were cut into 2.0cm×2.0cm pieces and placed in sterile Petri dishes. 0.1mL of the bacterial suspension was pipetted onto the sample surface and gently pressed to ensure full contact between the bacterial suspension and the sample. The Petri dishes were placed in a 37℃±1℃ incubator and allowed to stand for 20 minutes. After this time, 10mL of sterile elution buffer (such as physiological saline containing 0.05% Tween 80) was added to the Petri dishes, and the mixture was thoroughly shaken to elute. The elution buffer was serially diluted and inoculated using the plate spread method. Colony counts were recorded after incubation. A bacterial suspension without sample was used as a positive control. The inhibition rate was calculated as follows: Inhibition rate (%) = (average colony count in the control group - average colony count in the sample group) / average colony count in the control group × 100%. At least three parallel tests were performed for each sample group, and the average value was taken.

[0074] (2) Tests on absorption rate, reverse osmosis and diffusion width: Take 5mL of animal blood and add it to the solution. Record the absorption time as the absorption rate in seconds. At 4 minutes, measure the diffusion width in centimeters with a ruler. Reverse osmosis is achieved by placing a 1.2kg weight on 5g of filter paper on the absorbent material (sanitary napkin) for 1 minute after each addition of solution 5 minutes later. Weigh the increase in weight of the filter paper in grams.

[0075] Table 1 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. An antibacterial and absorbent hygiene product, characterized in that, The sanitary absorbent product comprises, from top to bottom, an antibacterial and liquid-permeable surface layer, a diversion layer, an absorbent layer, and a breathable bottom layer; wherein, the antibacterial and liquid-permeable surface layer is formed by mixing and laying together antibacterial fibers, superabsorbent fibers and synthetic fibers in different proportions, and the antibacterial fibers are prepared by impregnating a synthetic fiber web with a nanocomposite antibacterial agent solution; The surface of the flow guide layer is provided with two recesses and one protrusion parallel to each other along the length direction. The protrusion is located between the two recesses, and the top of the protrusion is higher than the bottom surface of the recesses.

2. The sanitary absorbent product according to claim 1, characterized in that, The antibacterial fiber is prepared by the following method: (11) Add organic antibacterial agent, inorganic antibacterial agent, anti-inflammatory soothing agent, antioxidant, pH adjuster and barrier repair agent to water and stir and mix with ultrasonically to obtain nanocomposite antibacterial agent solution; (12) The synthetic fiber is opened and dispersed to form a fiber web, and then the fiber web is sequentially immersed in the first nanocomposite antibacterial agent solution, the second nanocomposite antibacterial agent solution and the third nanocomposite antibacterial agent solution. After drying and curing, the antibacterial fiber is obtained. Preferably, the concentration of the second nanocomposite antibacterial agent solution is greater than the concentration of the first nanocomposite antibacterial agent, and the third nanocomposite antibacterial agent solution further includes a silane coupling agent; More preferably, the concentration of the second nanocomposite antibacterial agent solution is 2 to 5 times that of the first nanocomposite antibacterial agent solution, and the amount of silane coupling agent added is 0.1 to 0.5% of the nanocomposite antibacterial agent.

3. The sanitary absorbent product according to claim 2, characterized in that, In step (11), the organic antibacterial agent is quaternized chitosan, the inorganic antibacterial agent is nano silver oxide, the anti-inflammatory and soothing agent is dipotassium glycyrrhizate, the antioxidant includes tea polyphenols and blackcurrant powder, the pH adjuster is lactic acid, and the barrier repair agent includes panthenol and collagen. Preferably, by weight, the organic antibacterial agent is 0.1-0.5 parts, the inorganic antibacterial agent is 0.05-0.5 parts, the anti-inflammatory and soothing agent is 0.2-2 parts, the antioxidant is 0.55-10.2 parts, the pH adjuster is 0.5-1.0 parts, the barrier repair agent is 0.8-17 parts, and the water is 200-500 parts.

4. The sanitary absorbent product according to claim 1, characterized in that, The synthetic fiber is polypropylene fiber or polyethylene terephthalate fiber; the super absorbent fiber is SAF super absorbent fiber. The antibacterial and liquid-permeable surface layer is composed of three layers of fiber mesh laid from top to bottom; wherein, the first layer of fiber mesh is formed by laying a mixture of antibacterial fibers and synthetic fibers; the second layer of fiber mesh is formed by laying a mixture of antibacterial fibers, super absorbent fibers and synthetic fibers; and the third layer of fiber mesh is formed by laying a mixture of super absorbent fibers and synthetic fibers. Preferably, by mass percentage, the first layer of fiber web comprises 50-60% antibacterial fiber and 40-50% synthetic fiber; the second layer of fiber web comprises 20-40% antibacterial fiber, 40-50% superabsorbent fiber, and 10-20% synthetic fiber; and the third layer of fiber web comprises 60-70% superabsorbent fiber and 30-40% synthetic fiber.

5. The sanitary absorbent product according to claim 1, characterized in that, The depth of each recess is 0.5~3mm and the width is 5~15mm; the height of each protrusion is 2~4mm and the width is 10~30mm.

6. The sanitary absorbent product according to claim 1, characterized in that, The central region of the protrusion is provided with a hollow three-dimensional protrusion, which is used to guide the liquid to seep and diffuse downwards. The outer diameter of the three-dimensional boss gradually decreases from top to bottom in the vertical direction, and the bottom end of the three-dimensional boss is a closed end. Preferably, the cross-sectional shape of the three-dimensional boss is an inverted trapezoid or an arc, with an inner diameter of 1~4mm at the top and 0.5~2mm at the bottom.

7. The sanitary absorbent product according to claim 6, characterized in that, The height of the three-dimensional boss is 2.2~4.5mm, and the thickness of the closed end is 0.5~0.8mm; The center of the closed end is provided with a flow guide hole, the diameter of which is 0.5~1.5mm.

8. The sanitary absorbent product according to claim 6, characterized in that, The central region of the absorption layer is provided with a raised conical guide column and several concentric annular guide grooves distributed around the conical guide column. Preferably, the outer diameter of the conical guide column gradually increases from top to bottom along the vertical direction; More preferably, the height of the conical guide column is 1-3 mm, the top diameter is 0.3-2 mm, and the bottom diameter is 1-4 mm; and / or The depth of the annular guide groove is 0.2~2mm, the width is 0.5~3mm, and the distance between two adjacent guide grooves is 1~3mm.

9. The sanitary absorbent product according to claim 1, characterized in that, The flow guiding layer is made of polyurethane foam. The absorbent layer is composed of at least one layer of wet-process superabsorbent resin composite paper; and / or The breathable bottom layer is at least one layer of water-repellent non-woven fabric or PE breathable membrane.

10. A method for preparing an antibacterial sanitary absorbent product according to any one of claims 1 to 9, characterized in that, The preparation method includes the following steps: (1) The prepared antibacterial fiber is mixed with synthetic fiber and super absorbent fiber in proportion, and then opened in sections by a partition opening machine and combed to form a three-layer fiber web; (2) The three-layer fiber mesh is heated and cooled to solidify to obtain the antibacterial and liquid-permeable surface layer; preferably, the heating temperature is 135~150℃ and the time is 1~3s; (3) The antibacterial and liquid-permeable surface layer, the diversion layer, the absorption layer and the breathable bottom layer are compounded in sequence to obtain the antibacterial and hygienic absorbent product.

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