Composite core body and absorption product

Abstract

The invention discloses a composite core body and an absorption product, and relates to the technical field of sanitary napkins, and the absorption product comprises a surface layer, a flow guide layer, an absorption core body and a bottom film which are sequentially arranged from top to bottom; the absorption core body comprises a composite core body, the composite core body is formed by compositing three fiber materials including a supporting material, an upper layer material and a lower layer material, the supporting material is PET crude fibers, the upper layer material is ES fibers, and the lower layer material is modified acrylic fibers; the absorption product integrates the functions of bacteriostasis, skin care, rapid flow guide and efficient water locking, a stable three-dimensional leakage-proof system is constructed through the synergistic effect of the modified composite core body and all the assemblies, and the liquid absorption speed and the reverse osmosis resistance are remarkably improved; meanwhile, excellent breathability and antibacterial effect are achieved, the risk of red buttocks is effectively reduced, and dry, safe and comfortable extreme wearing experience is achieved.

Description

Technical Field

[0001] This invention relates to the field of sanitary napkin technology, specifically to a composite core and absorbent material. Background Technology

[0002] Absorbent products such as diapers, sanitary napkins, and adult incontinence products have become indispensable hygiene care products in modern life. Typical absorbent products usually include a multi-layered structure consisting of a top layer, a distribution layer, an absorbent core, a SAP absorbent layer, and a bottom film. Among these, the absorbent core, as the core component for fluid management, plays a decisive role in the overall performance of the product.

[0003] Traditional absorbent cores often use wood pulp, cotton fiber, or ordinary chemical fiber as the main absorbent material. However, these traditional materials face many technical challenges in practical applications: (1) slow absorption speed, which easily leads to liquid accumulation on the surface and affects the user experience; (2) poor anti-backflow performance, which makes it easy for liquid to be squeezed out of the core under pressure, resulting in backflow and side leakage; (3) unreasonable pore structure between fibers, uneven liquid distribution, which affects subsequent absorption after local saturation; (4) lack of effective antibacterial function, which makes it easy for bacteria to grow in humid environments.

[0004] To address these issues, the industry has explored various improvement solutions. One approach involves optimizing the core's pore distribution by adjusting the fiber's physical structure, such as changing its diameter, length, and crimp. However, this method offers limited improvement in liquid absorption performance. Another approach involves surface chemical modification of the fibers, introducing hydrophilic groups to enhance absorption speed. However, existing modification methods have significant limitations: simple hydrophilic modification, while increasing absorption speed, often worsens backflow resistance, leading to a "fast in, fast out" problem; while simple hydrophobic modification hinders initial liquid penetration. Furthermore, existing technologies often employ physical coating or simple impregnation for surface treatment, resulting in a lack of strong chemical bonds between the modifier and the fiber matrix. Under long-term use or pressure conditions, desorption or loss can easily occur, leading to a decline in the modification effect.

[0005] In recent years, some studies have attempted to construct core structures using multi-fiber composites to improve liquid absorption performance through the synergistic effect of different functional fibers. However, existing composite schemes mostly remain at the level of simple physical mixing, lacking in-depth research on the gradient distribution and synergistic mechanisms between fibers, making it difficult to achieve precise control of liquid flow within the core.

[0006] Therefore, developing a novel absorbent core that possesses both rapid liquid absorption capability and effective backflow prevention, along with a stable structure and long-lasting performance, is a crucial issue that urgently needs to be addressed in the field of absorbent products technology. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a composite core and absorbent product. The absorbent product of the present invention integrates antibacterial and skin-care functions, rapid drainage and efficient water-locking functions. Through the synergistic effect of the modified composite core and various components, a stable three-dimensional leak-proof system is constructed, which significantly improves the liquid absorption speed and anti-backflow performance. At the same time, it also has excellent breathability and antibacterial effect, effectively reducing the risk of diaper rash and achieving the ultimate wearing experience of dryness, safety and comfort.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A composite core, the composite core being composed of three fiber materials, the three fiber materials comprising:

[0010] The supporting material has a fiber diameter of 0.1~0.5mm, a water absorption ratio of 6~15 times, and accounts for 20~30% of the weight of the composite core;

[0011] The upper layer material has a fiber diameter of 4~8μm, a water absorption ratio of 10~20 times, and accounts for 20~40% of the weight of the composite core;

[0012] The lower layer material has a fiber diameter of 0.6~3μm and accounts for 50~60% of the weight of the composite core;

[0013] The supporting material is PET coarse fiber, the upper material is ES fiber, and the lower material is modified acrylic fiber.

[0014] The supporting material forms a supporting framework within the composite core; the upper material facilitates rapid liquid infiltration; and the lower material facilitates rapid liquid absorption and diffusion.

[0015] Preferably, the modified acrylic fiber is prepared by the following method steps:

[0016] (1) After washing and drying, the acrylic fiber is immersed in deionized water, then polyethyleneimine and zinc chloride are added, and the reaction is carried out under nitrogen atmosphere. The product is filtered, washed and dried to obtain aminated acrylic fiber.

[0017] Nucleophilic addition grafting: zinc chloride on Lewis acid catalyst Under the coordination effect, the cyano groups on the surface of acrylic fibers Increased polarity and enhanced activity. Polyethyleneimine (PEI) molecules are rich in primary amine groups. As a strong nucleophile, it attacks the activated cyano carbon atom to undergo a nucleophilic addition reaction, generating a stable amidine group. Structure. This process covalently bonds the long chains of PEI to the fiber surface, thereby introducing a high density of active amino reaction sites onto the originally chemically inert acrylic fiber surface.

[0018] Preferably, in step (1), the ratio of acrylic fiber, deionized water, polyethyleneimine, and zinc chloride is 5g: 100~150mL: 1~2.5g: 0.02~0.05g.

[0019] Preferably, in step (1), the washing is performed with acetone; the reflux reaction conditions are reflux reaction at 94~100℃ for 8~16h; the product is ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI.

[0020] (2) Disperse the aminated fiber in ethanol, add triethylamine, heat up, slowly add 1,1,2,2-tetrafluoroethyl glycidyl ether, continue the reflux reaction under nitrogen protection, filter, wash and dry the product to obtain modified acrylic fiber.

[0021] Epoxy ring-opening addition: The amino groups on the surface of the aminated fiber act as nucleophilic sites, attacking the epoxy groups in 1,1,2,2-tetrafluoroethyl glycidyl ether with the assistance of the basic catalyst triethylamine. The epoxy ring undergoes an SN2 nucleophilic ring-opening reaction, generating a new secondary amine bond. and side hydroxyl groups Through this reaction, fluorinated hydrophobic segments are firmly chemically grafted onto the fiber surface, thereby endowing the modified fiber with hydrophobic and oleophobic properties.

[0022] Preferably, in step (2), the ratio of amino-modified cellulose, ethanol, triethylamine, and 1,1,2,2-tetrafluoroethyl glycidyl ether is 5g: 80~150mL: 0.05~0.1mL: 0.5~1.2g.

[0023] Preferably, in step (2), the temperature is raised to 70~85℃ and the reflux reaction time is 4~8h.

[0024] Preferably, the overall water absorption ratio of the composite core is 5 to 15 times, and the weight ranges from 60 to 300 gsm.

[0025] The present invention also claims protection for an absorbent article comprising, from top to bottom, a surface layer 1, a flow guiding layer 3, an absorbent core 4, and a bottom membrane 6; the absorbent core comprising the composite core described above.

[0026] Preferably, the surface layer 1 is made of skin-friendly non-woven fabric, and antibacterial ingredients are added to the surface layer 1. The antibacterial ingredients are selected from at least one of tea polyphenols, apigenin, chitosan and aloe vera.

[0027] Preferably, the flow guiding layer 3 is made of hot air nonwoven fabric with a basis weight of 30 gsm or more and a thickness of 0.5 mm or more.

[0028] Preferably, the bottom film 6 is a PE breathable bottom film.

[0029] Preferably, an SAP absorption layer 5 is further provided between the absorbent core 4 and the bottom film 6, and the SAP absorption layer 5 is distributed in the middle section of the absorbent product.

[0030] Preferably, the absorbent article further includes three-piece edge protection material 2 disposed on both sides of the surface layer.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The absorbent product provided by the present invention has excellent liquid absorption performance, dryness and comfort. First, the surface layer uses a skin-friendly non-woven fabric with added antibacterial ingredients (such as tea polyphenols and apigenin), which is not only soft to the touch but also effectively inhibits bacterial growth, reduces odor and the risk of diaper rash, and protects skin health. Second, a high-grammage (over 30gsm) and relatively thick hot-air non-woven fabric diversion layer creates a buffer space between the surface layer and the core, which can quickly receive and temporarily store large amounts of liquid, preventing backflow. Next, the absorbent core in the middle uses a unique gradient fiber structure to create an efficient liquid transmission channel, which has excellent pressure resistance, resilience, and diversion and diffusion capabilities. As the hub of liquid management, it can quickly transfer liquid downwards and spread it evenly, avoiding local liquid accumulation. Furthermore, the SAP absorbent layer below the absorbent core focuses on the final sealing of liquid. In conjunction with the PE breathable bottom membrane, it maintains breathability while ensuring no leakage, avoiding stuffiness. Finally, the three-piece edge protection material further enhances the side leakage prevention capability, creating a comprehensive three-dimensional protection system.

[0033] 2. The composite core provided by this invention achieves efficient liquid management through a gradient blending of fibers with different fineness and functions. Specifically, 0.1~0.5mm coarse PET fibers serve as a supporting material, constructing a rigid framework with high porosity, giving the core excellent compressive resilience and preventing channel blockage under pressure; 4~8μm ES fibers are located in the upper layer, utilizing their thermal adhesion to stabilize the structure and guide the liquid to rapidly infiltrate; while the modified acrylic fibers in the lower layer are key to achieving rapid liquid absorption and diffusion and preventing backflow. This modified fiber introduces specific functional groups through a two-step reaction: First, polyethyleneimine (PEI) introduces a large number of hydrophilic groups onto the fiber surface. These hydrophilic groups form associated hydrogen bonds with water molecules, allowing water molecules to remain on the fiber. Under the influence of chemical bonds, it exhibits excellent water absorption and salt water absorption rates. Second, hydrophobic modification is achieved through fluoride, thereby improving its hydrophobic properties and preventing liquid backflow under pressure, thus enhancing its anti-backflow performance. Ultimately, the composite core prepared in this application possesses both good air permeability and excellent anti-backflow performance. It is particularly important to emphasize that the amount of fluoride used in this invention is strictly limited within the specified range. If the amount of fluoride is excessive, it will over-shield the hydrophilic active sites introduced by PEI, resulting in an overly hydrophobic fiber surface (similar to the lotus leaf effect), which will hinder the entry of liquid into the fiber interior or diffusion between fibers, severely reducing the water absorption performance of the modified acrylic fiber. Only within the limited dosage range can the optimal balance of "microscopic hydrophilic capture and macroscopic hydrophobic anti-permeability" be achieved. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some schematic diagrams of certain embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the absorbent product prepared according to an embodiment of the present invention.

[0036] In the diagram, 1 is the top layer; 2 is the three-piece edge protection material; 3 is the flow guiding layer; 4 is the absorbent core; 5 is the SAP absorbent layer; and 6 is the bottom film. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0038] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

[0039] A method for preparing modified acrylic fiber includes the following steps:

[0040] (1) Wash 5g of acrylic fiber with acetone, dry it, immerse it in 100~150mL of deionized water, then add 1~2.5g of polyethyleneimine and 0.02~0.05g of zinc chloride, reflux reaction at 94~100℃ in nitrogen atmosphere for 8~16h, filter the product, and wash the product with a large amount of deionized water multiple times by ultrasonic washing to completely remove the physically adsorbed free PEI, dry it to obtain aminated acrylic fiber;

[0041] (2) Disperse 5g of aminated fiber into 80-150mL of ethanol, add 0.05-0.1mL of triethylamine, heat to 70-85℃, slowly add 0.5-1.2g of 1,1,2,2-tetrafluoroethyl glycidyl ether, and continue to reflux for 4-8h under nitrogen protection. Filter, wash and dry the product to obtain modified acrylic fiber.

[0042] An absorbent product includes, from top to bottom, a surface layer 1, a flow guiding layer 3, an absorbent core 4, a SAP absorbent layer 5, and a bottom film 6, wherein the absorbent core 4 comprises the composite core; and the surface layer 1 of the absorbent product is further provided with three-piece edge protection materials 2 on both sides.

[0043] Surface layer 1: Made of skin-friendly non-woven fabric, and containing antibacterial ingredients, wherein the antibacterial ingredients are selected from at least one of tea polyphenols, apigenin, chitosan and aloe vera.

[0044] Flow guiding layer 3: Made of hot air nonwoven fabric with a basis weight of 30 gsm or more and a thickness of 0.5 mm or more.

[0045] Absorbent Core 4: Contains a composite core, which is made of a mixture of the following three types of fibers air-laid: a supporting material with a fiber diameter of 0.1mm~0.5mm, a water absorption ratio of 6~15 times, and a weight percentage of 20~30% in the composite core; an upper material with a fiber diameter of 4~8μm, a water absorption ratio of 10~20 times, and a weight percentage of 20~40% in the composite core; and a lower material with a fiber diameter of 0.6~3μm, and a weight percentage of 50~60% in the composite core. The supporting material is PET coarse fiber, the upper material is ES fiber, and the lower material is modified acrylic fiber. The overall water absorption ratio of the composite core is 5~15 times, and the basis weight ranges from 60~300gsm.

[0046] SAP Absorption Layer 5: Located between Absorption Core 4 and Bottom Film 6, distributed in the middle section region.

[0047] Bottom membrane 6: PE breathable microporous bottom membrane is used.

[0048] The present invention will be further described below through specific embodiments.

[0049] Preparation Example 1

[0050] A method for preparing modified acrylic fiber includes the following steps:

[0051] (1) 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 2.5g of polyethyleneimine and 0.05g of zinc chloride were added and refluxed at 100℃ under nitrogen atmosphere for 8h. The product was filtered and ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI. After drying, aminoated acrylic fiber was obtained.

[0052] (2) Disperse 5g of aminated fiber into 120mL of ethanol, add 0.1mL of triethylamine, heat to 85℃, slowly add 1.2g of 1,1,2,2-tetrafluoroethyl glycidyl ether, and continue to reflux for 4h under nitrogen protection. Filter, wash and dry the product to obtain modified acrylic fiber.

[0053] Preparation Example 2

[0054] A method for preparing modified acrylic fiber includes the following steps:

[0055] (1) 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 2.0g of polyethyleneimine and 0.04g of zinc chloride were added and refluxed at 98°C under nitrogen atmosphere for 10h. The product was filtered and ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI. After drying, aminoated acrylic fiber was obtained.

[0056] (2) Disperse 5g of aminated fiber into 120mL of ethanol, add 0.08mL of triethylamine, heat to 80℃, slowly add 1.0g of 1,1,2,2-tetrafluoroethyl glycidyl ether, and continue to reflux for 5h under nitrogen protection. Filter, wash and dry the product to obtain modified acrylic fiber.

[0057] Preparation Example 3

[0058] A method for preparing modified acrylic fiber includes the following steps:

[0059] (1) 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 1.5g of polyethyleneimine and 0.03g of zinc chloride were added and refluxed at 96°C under nitrogen atmosphere for 14h. The product was filtered and ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI. After drying, aminoated acrylic fiber was obtained.

[0060] (2) Disperse 5g of aminated fiber into 120mL of ethanol, add 0.06mL of triethylamine, heat to 75℃, slowly add 0.8g of 1,1,2,2-tetrafluoroethyl glycidyl ether, and continue to reflux for 7h under nitrogen protection. Filter, wash and dry the product to obtain modified acrylic fiber.

[0061] Preparation Example 4

[0062] A method for preparing modified acrylic fiber includes the following steps:

[0063] (1) 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 1g of polyethyleneimine and 0.02g of zinc chloride were added and refluxed at 94°C under nitrogen atmosphere for 16h. The product was filtered and ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI. After drying, aminoated acrylic fiber was obtained.

[0064] (2) Disperse 5g of aminated fiber into 120mL of ethanol, add 0.05mL of triethylamine, heat to 70℃, slowly add 0.5g of 1,1,2,2-tetrafluoroethyl glycidyl ether, and continue to reflux for 8h under nitrogen protection. Filter, wash and dry the product to obtain modified acrylic fiber.

[0065] Comparative Example 1

[0066] A method for preparing modified acrylic fiber includes the following steps:

[0067] (1) 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 2.5g of polyethyleneimine and 0.05g of zinc chloride were added and refluxed at 100℃ under nitrogen atmosphere for 8h. The product was filtered and ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI. After drying, aminoated acrylic fiber was obtained.

[0068] (2) Disperse 5g of aminated fiber into 120mL of ethanol, slowly add 1.2g of 1,1,2,2-tetrafluoroethyl glycidyl ether, impregnate at room temperature for 1h, filter and dry the product to obtain modified acrylic fiber.

[0069] Comparative Example 2

[0070] A method for preparing modified acrylic fiber includes the following steps:

[0071] 5g of acrylic fiber was washed with acetone, dried, and then immersed in 150mL of deionized water. Then 2.5g of polyethyleneimine was added and the mixture was soaked at room temperature for 1 hour. The product was then filtered and dried to obtain modified acrylic fiber.

[0072] Example

[0073] An absorbent product includes, from top to bottom, a surface layer 1, a flow guiding layer 3, an absorbent core 4, a SAP absorbent layer 5, and a bottom film 6, wherein the absorbent core 4 comprises the composite core; and the surface layer 1 of the absorbent product is further provided with three-piece edge protection materials 2 on both sides.

[0074] Surface layer 1: Made of skin-friendly non-woven fabric, and containing antibacterial ingredients, wherein the antibacterial ingredients are selected from at least one of tea polyphenols, apigenin, chitosan and aloe vera.

[0075] Flow guiding layer 3: Made of hot air nonwoven fabric with a basis weight of 40 gsm and a thickness of 0.8 mm.

[0076] Absorbent core 4: Contains a composite core, which is made of a mixture of the following three types of fibers air-laid: the supporting material is PET coarse fiber with a fiber diameter of 0.3 mm, accounting for 25% of the weight of the composite core; the upper material is ES fiber with a fiber diameter of 6 μm, accounting for 20% of the weight of the composite core; and the lower material is modified acrylic fiber with a fiber diameter of 1.5 μm, accounting for 55% of the weight of the composite core.

[0077] SAP Absorbent Layer 5: Located between Absorbent Core 4 and Bottom Film 6, with an SAP coating amount of 40 gsm, distributed in the middle section area.

[0078] Bottom membrane 6: PE breathable microporous bottom membrane is used.

[0079] Composite cores were prepared using the modified acrylic fibers obtained in Preparation Examples 1-4 and Comparative Examples 1-2 as raw materials, and the performance of the composite cores was tested.

[0080] Mechanical strength test: The dry breaking strength, wet breaking strength and elongation at break of modified acrylic fiber were determined according to GB / T 14337-2022 "Test method for tensile properties of chemical fiber short fiber". The higher the dry breaking strength, wet breaking strength and elongation at break, the better. Among them, dry breaking strength and wet breaking strength represent mechanical strength, and elongation at break represents flexibility. The data results are shown in Table 1.

[0081] Water absorption ratio test: Using the tea bag method, 1g of composite core was weighed and placed in a tea bag, then immersed in deionized water and 0.9% physiological saline. After sufficient liquid absorption and reaching equilibrium, the bag was suspended and allowed to stand for 30 minutes to remove any unabsorbed water and saline solution. The mass of the composite core was then weighed. The water absorption ratio is calculated as follows: The formula was used for calculation, where m1 is the mass of the composite core after liquid absorption, and m2 is the initial mass of the composite core. The arithmetic mean of five measurements was taken as the measurement result, and the data results are shown in Table 1.

[0082] Absorption rate test: Take 50 mL of deionized water into a beaker, place a magnetic rotor in the beaker, place it on a magnetic stirrer, adjust the speed to 600 r / min, add 2 g of composite core into the vortex, and the vortex begins to disappear while absorbing the deionized water. The time required for the liquid surface to become still is the absorption rate. The data results are shown in Table 1.

[0083] Reverse osmosis test: After absorbing deionized water for 1 hour, the composite core is placed at 25℃ and 70% (relative humidity). A filter paper is placed on its surface, and its mass is recorded as m1. A 250g weight is used to press it down for 6 hours. After 6 hours, the weight of the filter paper is recorded as m2. The reverse osmosis rate is calculated as follows: The data results are shown in Table 1.

[0084] Table 1. Performance test results of modified acrylic fiber and composite core

[0085] Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Comparative Example 1 Comparative Example 2 Fiber dry breaking strength (cN / dtex) 2.55 2.62 2.68 2.74 2.56 2.78 Fiber wet breaking strength (cN / dtex) 2.25 2.30 2.35 2.38 2.10 2.36 Fiber breaking elongation (%) 31.5 32.2 33.0 34.1 31.8 32.7 Water absorption ratio (g / g) 227.8 221.2 218.5 212.8 173.0 131.5 Saline solution uptake ratio (g / g) 32.5 31.9 31.2 30.6 28.7 17.4 Absorption rate (s) 14 16 18 21 29 43 Backflow rate (g) 0.12 0.18 0.25 0.32 1.45 2.51

[0086] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A composite core, characterized in that, The composite core is composed of three fiber materials, including: The supporting material has a fiber diameter of 0.1~0.5mm, a water absorption ratio of 6~15 times, and accounts for 20~30% of the weight of the composite core; The upper layer material has a fiber diameter of 4~8μm, a water absorption ratio of 10~20 times, and accounts for 20~40% of the weight of the composite core; The lower layer material has a fiber diameter of 0.6~3μm and accounts for 50~60% of the weight of the composite core; The supporting material is PET coarse fiber, the upper material is ES fiber, and the lower material is modified acrylic fiber.

2. The composite core according to claim 1, characterized in that, The modified acrylic fiber was prepared by the following method steps: (1) After washing and drying, the acrylic fiber is immersed in deionized water, then polyethyleneimine and zinc chloride are added, and the reaction is carried out under nitrogen atmosphere. The product is filtered, washed and dried to obtain aminated acrylic fiber. (2) Disperse the aminated fiber in ethanol, add triethylamine, heat up, slowly add 1,1,2,2-tetrafluoroethyl glycidyl ether, continue the reflux reaction under nitrogen protection, filter, wash and dry the product to obtain modified acrylic fiber.

3. The composite core according to claim 2, characterized in that, In step (1), the ratio of acrylic fiber, deionized water, polyethyleneimine and zinc chloride is 5g: 100~150mL: 1~2.5g: 0.02~0.05g.

4. The composite core according to claim 2, characterized in that, In step (1), the washing is performed with acetone; the reflux reaction conditions are reflux reaction at 94~100℃ for 8~16h; the product is ultrasonically washed multiple times with a large amount of deionized water to completely remove the physically adsorbed free PEI.

5. The composite core according to claim 2, characterized in that, In step (2), the ratio of amino-modified cellulose, ethanol, triethylamine, and 1,1,2,2-tetrafluoroethyl glycidyl ether is 5g: 80~150mL: 0.05~0.1mL: 0.5~1.2g.

6. The composite core according to claim 2, characterized in that, In step (2), the temperature is raised to 70~85℃ and the reflux reaction time is 4~8h.

7. The composite core according to claim 1, characterized in that, The overall water absorption ratio of the composite core is 5 to 15 times, and the weight ranges from 60 to 300 gsm.

8. An absorbent article, characterized in that, It includes a top layer, a flow guiding layer, an absorbent core, and a bottom membrane arranged sequentially from top to bottom; the absorbent core comprises a composite core as described in any one of claims 1 to 7.

9. The absorbent article according to claim 8, characterized in that, An SAP absorption layer is further disposed between the absorbent core layer and the bottom film, and the SAP absorption layer is distributed in the middle section of the absorbent product.

10. The absorbent article according to claim 8, characterized in that, The absorbent material also includes three-piece edge protection material disposed on both sides of the surface layer.

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