A highly breathable and super absorbent diaper pad and preparation method thereof

Abstract

The present invention discloses a highly breathable super absorbent diaper pad and a preparation method thereof, which belongs to the technical field of diaper pads, and comprises a protective layer, an absorption layer and an anti-reverse osmosis layer from top to bottom, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber. The present invention adopts a three-layer non-woven fabric structure with gradual changes in pore size, hydrophilicity and disorder, which can accelerate urine absorption and prevent reverse osmosis; the present invention treats soybean protein to improve hydrophilicity, antibacterial property and air permeability, and the amphiphilicity can make urine diffuse and be absorbed faster and adjust water absorption balance; the present invention utilizes mannitol, hexafluorobutyl methacrylate and other ingredients to make the fiber have excellent water absorption, reduce surface energy, and form a network structure with block copolymer and sodium polyacrylate to improve water absorption and air permeability.

Description

Technical Field

[0001] The present invention belongs to the technical field of diaper pads, and in particular relates to a highly breathable and super absorbent diaper pad and a preparation method thereof. Background Art

[0002] As a common sanitary product, diapers are designed to provide users with convenience, comfort and effective excrement treatment. In terms of the materials of diaper pads, there are many common fiber materials. Among them, viscose fiber is made of natural fiber as raw material, and its chemical structure is the same as that of natural cellulose fiber. The fabric made of it has certain moisture absorption and heat dissipation, softness and biodegradability. However, ordinary viscose fiber has the problem of insufficient antibacterial property when it comes into contact with urine. Bacteria in urine are easy to breed and multiply on the fiber surface, which not only produces odor, but also may threaten the user's skin health. In addition, the water-absorbing material of diapers does not absorb water fast enough or has limited water absorption capacity. When the amount of urine produced is large, it may not be absorbed in time and effectively, causing urine leakage, which brings inconvenience to the user. Moreover, during the water absorption process, if the material has poor spreading performance for urine, urine is easy to gather on the surface of the pad to form droplets instead of being quickly absorbed into the inside, which also affects the use effect of diapers. In terms of breathability, traditional materials and structures may limit the circulation of air in diapers. If the air cannot circulate effectively, the humidity inside the diaper will increase, the stuffiness will intensify, and it will also make the user feel uncomfortable. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention achieves the functions of high air permeability, super water absorption and antibacterial of the diaper pad by modifying the three-layer structure of the diaper pad.

[0004] In order to achieve the above-mentioned purpose, the following technical scheme is adopted: The present invention provides a highly breathable super absorbent diaper pad, comprising a protective layer, an absorption layer and an anti-reverse osmosis layer from top to bottom, the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber.

[0005] Furthermore, the hydrophilic modified viscose fiber is prepared by the following steps:

[0006] (1) Adding soybean protein to deionized water, then adding 2-mercaptoethanol and sodium dodecylbenzene sulfonate in a water bath, reacting at 30-60°C for 1-3 hours to obtain thiol-grafted modified soybean protein, then adding 12-bromo-1-dodecene and diethylenetriamine penta(methylenephosphonic acid), reacting for 1-1.5 hours to obtain hydrophilic modified soybean protein;

[0007] (2) Add polyvinyl alcohol to deionized water, then add hydrophilic modified soybean protein and an initiator, stir evenly, and then perform electrostatic spinning. After washing, dehydrating, and drying, the antibacterial modified soybean protein viscose fiber is obtained.

[0008] Furthermore, the super absorbent fiber is prepared by the following steps:

[0009] S1. Add sodium hydride to tetrahydrofuran under nitrogen atmosphere, slowly drop imidazo[1,2-A]pyridine-3-ylmethanol in a -5°C ice bath, return to room temperature after the dropwise addition is complete, react for 12-16 hours, then add dibromomannitol, continue to react for 3-5 hours, filter, concentrate the filtrate and add it to a mixed solution of excess petroleum ether and ethyl acetate, filter through diatomaceous earth, remove the solvent under reduced pressure, and obtain a block copolymer hydrophilic monomer;

[0010] S2, adding benzylbis(triphenylphosphine)palladium chloride to toluene, adding block copolymer hydrophilic monomer after dissolving, maintaining 60-80°C for reaction for 12-24h, then adding hexafluorobutyl methacrylate, continuing the reaction for 12-24h, pouring the reaction solution into a large amount of methanol, filtering out the produced precipitate, and then drying in a vacuum drying oven at 60°C for 12-16h to obtain a block copolymer;

[0011] S3, adding the block copolymer obtained in step 1 into tetrahydrofuran, adding 6-10% by mass of sodium polyacrylate aqueous solution, and then adding 2,5-bis(aminomethyl)tetrahydrofuran, reacting for 5-8 hours to obtain a spinning solution, and obtaining the super absorbent fiber by electrospinning.

[0012] Furthermore, in the step (1), the mass ratio of soybean protein, deionized water, 2-mercaptoethanol, sodium dodecylbenzene sulfonate, 12-bromo-1-dodecene and diethylenetriaminepenta(methylenephosphonic acid) is 8-15:80-120:1.5-3:1.5-4:4.5-7:1.5-4.

[0013] Furthermore, in the step (2), the mass ratio of polyvinyl alcohol, deionized water, hydrophilic modified soy protein and initiator is 15-25:80-150:6-10:0.8-1.5.

[0014] Furthermore, in step (2), the injection flow rate of the electrospinning is 0.1-0.5 mL / h, the voltage is 12-15 kV, and the distance from the nozzle to the collecting plate is 12-15 cm.

[0015] Furthermore, in step S1, the mass ratio of sodium cyanide, imidazo[1,2-A]pyridine-3-ylmethanol, and dibromomannitol is 1-2.5:6-10:4-7.

[0016] Furthermore, in the step S2, the mass ratio of benzylbis(triphenylphosphine)palladium chloride, toluene, block copolymer hydrophilic monomer, and hexafluorobutyl methacrylate is 0.05-0.2:100-150:10-20:4-8.

[0017] Furthermore, in step S3, the mass ratio of the block copolymer, tetrahydrofuran, 2,5-bis(aminomethyl)tetrahydrofuran, and sodium polyacrylate aqueous solution is 10-15:50-80:2.5-4:15-30.

[0018] Furthermore, in step S3, the extrusion speed of the electrospinning is 2-4 mL / h, the distance from the needle to the receiving plate is 10-40 cm, and the rotation speed of the receiving plate is 500-800 r / min.

[0019] The content of antibacterial modified soybean protein viscose fiber in the protective layer is 50-70%, the content of polyester fiber is 10-30%, and the content of ES fiber is 10-30%; the content of super absorbent fiber in the absorption layer is 60-80%, and the content of antibacterial modified soybean protein viscose fiber is 20-30%; the content of super absorbent fiber in the anti-reverse osmosis layer is 50-70%, and the content of antibacterial modified soybean protein viscose fiber is 30-40%.

[0020] The present invention also provides a method for preparing a highly breathable and super absorbent diaper pad, comprising the following steps:

[0021] (a) placing the protective layer, the absorption layer and the anti-reverse osmosis layer into a mold from top to bottom, and then placing the mold into a hot press, setting the hot pressing temperature to 130° C., the pressure to 6 MPa, and the hot pressing time to 15 s, so that the three layers of materials are bonded to each other to form a tight structure, thereby obtaining a primary product;

[0022] (b) taking the primary product out of the mold, cutting it into a designed size using a cutting device, and then sealing the edge of the gasket to obtain the diaper gasket.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention adopts a three-layer nonwoven fabric structure. From the protective layer to the absorption layer and then to the anti-reverse osmosis layer, the pore size gradually decreases, the hydrophilicity gradually increases, and the disorder gradually increases. The appropriate disorder in the protective layer helps to form a complex network structure between the fibers, increasing the contact opportunity and contact area between urine and fibers, thereby accelerating the absorption rate of urine. The absorption layer can provide more gaps to accommodate liquid and ensure that the liquid is evenly distributed in the entire absorption layer. The high disorder of the anti-reverse osmosis layer further enhances the ability to lock the liquid, effectively preventing the occurrence of reverse osmosis, keeping the skin dry, and greatly improving the comfort of using the diaper pad;

[0025] (2) The present invention first grafts thiol groups on soybean protein, and then uses the thiol-ene click reaction of 12-bromo-1-dodecene to react with diethylenetriamine penta (methylene phosphonic acid) to introduce abundant phosphate groups, thereby improving the hydrophilicity of soybean protein. The phosphate groups destroy the cell membrane structure of bacteria or interfere with their metabolic process, thereby effectively inhibiting the growth and reproduction of bacteria and improving the antibacterial property. The hydrophobic long chain of 12-bromo-1-dodecene makes soybean protein amphiphilic. The hydrophobic part can prevent liquid from blocking the gaps between fibers and prevent water vapor from excessively gathering on the fiber surface to form water droplets, allowing air to flow in the channels between fibers, thereby enhancing air permeability. In addition, the surface tension of the liquid is reduced. Therefore, when urine contacts the protective layer, the urine is more likely to spread on the fiber surface due to the reduction in surface tension, so that the urine can diffuse faster in the gaps between fibers and then be absorbed by the super absorbent fibers in the absorption layer. In addition, the amphiphilicity can adjust the water absorption balance of the fibers under different humidity environments.

[0026] (3) The mannitol structure rich in hydroxyl groups makes the fiber have excellent water absorption capacity, while the fluorine atom of hexafluorobutyl methacrylate can reduce the surface energy. Through the reaction of 2,5-bis(aminomethyl)tetrahydrofuran with the unreacted bromine atom at one end of dibromomannitol, the hydrophilic side chains are connected, so that the block copolymer and sodium polyacrylate are interspersed to form a network structure. The structure contains a large number of gaps, which significantly improves the water absorption of the gasket absorption layer. The gaps are interconnected to form channels that are conducive to air circulation, thereby enhancing the air permeability of the gasket. As the processing temperature increases, the components in the super absorbent fiber will form micelles. In the micelle structure, the hydrophobic segments gather together to form a hydrophobic core, and the hydrophilic segments extend outside the micelles. The extension of the hydrophilic segments on the micelle surface can expose more hydrophilic adsorption sites and more effectively capture water molecules in urine, thereby further improving the hydrophilic water absorption. Secondly, the formation of micelles also helps to stabilize the performance of the fiber in a liquid environment, preventing the fiber from structural damage or performance degradation due to excessive water absorption, and ensuring that the diaper pad can continue to perform good water absorption and breathability functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The absorbency test results of the embodiments of the present invention and the comparative examples are shown in FIG.

[0028] Figure 2 The air permeability test results of the embodiments of the present invention and the comparative examples are shown in FIG.

[0029] Figure 3 The anti-permeability test results of the embodiments of the present invention and the comparative examples are shown in FIG.

[0030] Figure 4 The antibacterial test results of the embodiments of the present invention and the comparative examples are shown in FIG.

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0034] The experimental methods in the following examples are conventional methods unless otherwise specified, and the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified. Example 1

[0035] A highly breathable super absorbent diaper pad comprises, from top to bottom, a protective layer, an absorption layer and an anti-reverse osmosis layer, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber.

[0036] The hydrophilic modified viscose fiber is prepared by the following steps:

[0037] (1) Add soybean protein to deionized water, then add 2-mercaptoethanol and sodium dodecylbenzene sulfonate in a water bath, react at 30°C for 1 h to obtain thiol-grafted modified soybean protein, then add 12-bromo-1-dodecene and diethylenetriamine penta(methylenephosphonic acid), and react for 1 h to obtain hydrophilic modified soybean protein;

[0038] (2) Add polyvinyl alcohol to deionized water, then add hydrophilic modified soybean protein and an initiator, stir evenly, and then perform electrostatic spinning. After washing, dehydrating, and drying, the antibacterial modified soybean protein viscose fiber is obtained.

[0039] The super absorbent fiber is prepared by the following steps:

[0040] S1. Add sodium hydride to tetrahydrofuran under nitrogen atmosphere, slowly drop imidazo[1,2-A]pyridine-3-ylmethanol in a -5°C ice bath, return to room temperature after the dropwise addition is complete, react for 12 hours, then add dibromomannitol, continue to react for 3 hours, filter, concentrate the filtrate and add it to a mixed solution of excess petroleum ether and ethyl acetate, filter through diatomaceous earth, remove the solvent under reduced pressure, and obtain a block copolymer hydrophilic monomer;

[0041] S2, adding benzylbis(triphenylphosphine)palladium chloride to toluene, adding block copolymer hydrophilic monomer after dissolving, maintaining 60°C for reaction for 12h, then adding hexafluorobutyl methacrylate, continuing the reaction for 12h, pouring the reaction solution into a large amount of methanol, filtering out the produced precipitate, and then drying in a vacuum drying oven at 60°C for 12h to obtain a block copolymer;

[0042] S3. Add the block copolymer obtained in step 1 into tetrahydrofuran, add a 6% by mass sodium polyacrylate aqueous solution, and then add 2,5-bis(aminomethyl)tetrahydrofuran. After reacting for 5 hours, a spinning solution is obtained, and the super absorbent fiber is obtained by electrospinning.

[0043] In the step (1), the mass ratio of soybean protein, deionized water, 2-mercaptoethanol, sodium dodecylbenzene sulfonate, 12-bromo-1-dodecene and diethylenetriamine penta (methylene phosphonic acid) is 8:80:1.5:1.5:4.5:1.5; in the step (2), the mass ratio of polyvinyl alcohol, deionized water, hydrophilic modified soybean protein and initiator is 15:80:6:0.8; in the step (2), the injection flow rate of electrospinning is 0.1 mL / h, the voltage is 12 kV, and the distance from the nozzle to the collecting plate is 12 cm.

[0044] In the step S1, the mass ratio of sodium cyanide, imidazo[1,2-A]pyridine-3-ylmethanol and dibromomannitol is 1:6:4; in the step S2, the mass ratio of benzylbis(triphenylphosphine)palladium chloride, toluene, block copolymer hydrophilic monomer and hexafluorobutyl methacrylate is 0.05:100:10:4; in the step S3, the mass ratio of block copolymer, tetrahydrofuran, 2,5-bis(aminomethyl)tetrahydrofuran and sodium polyacrylate aqueous solution is 10:50:2.5:15; in the step S3, the extrusion speed of electrospinning is 2 mL / h, the distance from the needle to the receiving plate is 10 cm, and the rotation speed of the receiving plate is 500 r / min.

[0045] The content of antibacterial modified soybean protein viscose fiber in the protective layer is 50%, the content of polyester fiber is 300%, and the content of ES fiber is 20%; the content of super absorbent fiber in the absorption layer is 70%, and the content of antibacterial modified soybean protein viscose fiber is 30%; the content of super absorbent fiber in the anti-reverse osmosis layer is 60%, and the content of antibacterial modified soybean protein viscose fiber is 40%. Example 2

[0046] A highly breathable super absorbent diaper pad comprises, from top to bottom, a protective layer, an absorption layer and an anti-reverse osmosis layer, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber.

[0047] The hydrophilic modified viscose fiber is prepared by the following steps:

[0048] (1) Soy protein was added to deionized water, and then 2-mercaptoethanol and sodium dodecylbenzene sulfonate were added in a water bath, and the mixture was reacted at 60°C for 3 h to obtain thiol-grafted modified soy protein, and then 12-bromo-1-dodecene and diethylenetriamine penta(methylenephosphonic acid) were added and the mixture was reacted for 1.5 h to obtain hydrophilic modified soy protein;

[0049] (2) Add polyvinyl alcohol to deionized water, then add hydrophilic modified soybean protein and an initiator, stir evenly, and then perform electrostatic spinning. After washing, dehydrating, and drying, the antibacterial modified soybean protein viscose fiber is obtained.

[0050] The super absorbent fiber is prepared by the following steps:

[0051] S1. Add sodium hydride to tetrahydrofuran under nitrogen atmosphere, slowly drop imidazo[1,2-A]pyridine-3-ylmethanol in a -5°C ice bath, return to room temperature after the dropwise addition is completed, react for 16 hours, then add dibromomannitol, continue to react for 5 hours, filter, concentrate the filtrate and add it to a mixed solution of excess petroleum ether and ethyl acetate, filter through diatomaceous earth, remove the solvent under reduced pressure, and obtain a block copolymer hydrophilic monomer;

[0052] S2, adding benzylbis(triphenylphosphine)palladium chloride to toluene, adding block copolymer hydrophilic monomer after dissolving, maintaining the reaction at 80°C for 24 hours, then adding hexafluorobutyl methacrylate, continuing the reaction for 24 hours, pouring the reaction solution into a large amount of methanol, filtering out the produced precipitate, and then drying in a vacuum drying oven at 60°C for 16 hours to obtain a block copolymer;

[0053] S3, adding the block copolymer obtained in step 1 into tetrahydrofuran, adding 10% by mass sodium polyacrylate aqueous solution, and then adding 2,5-bis(aminomethyl)tetrahydrofuran, reacting for 5-8 hours to obtain a spinning solution, and obtaining the super absorbent fiber by electrospinning.

[0054] In the step (1), the mass ratio of soybean protein, deionized water, 2-mercaptoethanol, sodium dodecylbenzene sulfonate, 12-bromo-1-dodecene and diethylenetriamine penta (methylene phosphonic acid) is 15:120:3:4:7:4; in the step (2), the mass ratio of polyvinyl alcohol, deionized water, hydrophilic modified soybean protein and initiator is 25:150:10:1.5; in the step (2), the injection flow rate of electrospinning is 0.5 mL / h, the voltage is 15 kV, and the distance from the nozzle to the collecting plate is 15 cm.

[0055] In the step S1, the mass ratio of sodium cyanide, imidazo[1,2-A]pyridine-3-ylmethanol and dibromomannitol is 2.5:10:7; in the step S2, the mass ratio of benzylbis(triphenylphosphine)palladium chloride, toluene, block copolymer hydrophilic monomer and hexafluorobutyl methacrylate is 0.2:150:20:8; in the step S3, the mass ratio of block copolymer, tetrahydrofuran, 2,5-bis(aminomethyl)tetrahydrofuran and sodium polyacrylate aqueous solution is 15:80:4:30; in the step S3, the extrusion speed of electrospinning is 4 mL / h, the distance from the needle to the receiving plate is 40 cm, and the rotation speed of the receiving plate is 800 r / min.

[0056] The content of antibacterial modified soybean protein viscose fiber in the protective layer is 70%, the content of polyester fiber is 20%, and the content of ES fiber is 10%; the content of super absorbent fiber in the absorption layer is 80%, and the content of antibacterial modified soybean protein viscose fiber is 20%; the content of super absorbent fiber in the anti-reverse osmosis layer is 70%, and the content of antibacterial modified soybean protein viscose fiber is 30%. Example 3

[0057] A highly breathable super absorbent diaper pad comprises, from top to bottom, a protective layer, an absorption layer and an anti-reverse osmosis layer, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber.

[0058] The hydrophilic modified viscose fiber is prepared by the following steps:

[0059] (1) Soy protein was added to deionized water, and then 2-mercaptoethanol and sodium dodecylbenzene sulfonate were added in a water bath, and the mixture was reacted at 50°C for 2 h to obtain a thiol-grafted modified soybean protein, and then 12-bromo-1-dodecene and diethylenetriamine penta(methylenephosphonic acid) were added and the mixture was reacted for 1.2 h to obtain a hydrophilic modified soybean protein;

[0060] (2) Add polyvinyl alcohol to deionized water, then add hydrophilic modified soybean protein and an initiator, stir evenly, and then perform electrostatic spinning. After washing, dehydrating, and drying, the antibacterial modified soybean protein viscose fiber is obtained.

[0061] The super absorbent fiber is prepared by the following steps:

[0062] S1. Add sodium hydride to tetrahydrofuran under a nitrogen atmosphere, slowly drop imidazo[1,2-A]pyridine-3-ylmethanol in a -5°C ice bath, return to room temperature after the dropwise addition is complete, react for 15 hours, then add dibromomannitol, continue to react for 4 hours, filter, concentrate the filtrate and add it to a mixed solution of excess petroleum ether and ethyl acetate, filter through diatomaceous earth, remove the solvent under reduced pressure, and obtain a block copolymer hydrophilic monomer;

[0063] S2, adding benzylbis(triphenylphosphine)palladium chloride to toluene, adding block copolymer hydrophilic monomer after dissolving, maintaining the reaction at 70°C for 16 hours, then adding hexafluorobutyl methacrylate, continuing the reaction for 16 hours, pouring the reaction solution into a large amount of methanol, filtering out the produced precipitate, and then drying in a vacuum drying oven at 60°C for 15 hours to obtain a block copolymer;

[0064] S3, adding the block copolymer obtained in step 1 into tetrahydrofuran, adding 8% by mass of sodium polyacrylate aqueous solution, and then adding 2,5-bis(aminomethyl)tetrahydrofuran, reacting for 6 hours to obtain a spinning solution, and obtaining the super absorbent fiber by electrospinning.

[0065] In the step (1), the mass ratio of soybean protein, deionized water, 2-mercaptoethanol, sodium dodecylbenzene sulfonate, 12-bromo-1-dodecene and diethylenetriamine penta (methylene phosphonic acid) is 12:100:2:2.5:5:3; in the step (2), the mass ratio of polyvinyl alcohol, deionized water, hydrophilic modified soybean protein and initiator is 20:100:8:1.2; in the step (2), the injection flow rate of electrospinning is 0.2 mL / h, the voltage is 13 kV, and the distance from the nozzle to the collecting plate is 12.5 cm.

[0066] In the step S1, the mass ratio of sodium cyanide, imidazo[1,2-A]pyridine-3-ylmethanol and dibromomannitol is 2:8:5; in the step S2, the mass ratio of benzylbis(triphenylphosphine)palladium chloride, toluene, block copolymer hydrophilic monomer and hexafluorobutyl methacrylate is 0.12:120:15:6; in the step S3, the mass ratio of block copolymer, tetrahydrofuran, 2,5-bis(aminomethyl)tetrahydrofuran and sodium polyacrylate aqueous solution is 12:60:3:20; in the step S3, the extrusion speed of electrospinning is 3 mL / h, the distance from the needle to the receiving plate is 30 cm, and the rotation speed of the receiving plate is 600 r / min.

[0067] The content of antibacterial modified soybean protein viscose fiber in the protective layer is 60%, the content of polyester fiber is 20%, and the content of ES fiber is 20%; the content of super absorbent fiber in the absorption layer is 75%, and the content of antibacterial modified soybean protein viscose fiber is 25%; the content of super absorbent fiber in the anti-reverse osmosis layer is 65%, and the content of antibacterial modified soybean protein viscose fiber is 35%. Example 4

[0068] A method for preparing a highly breathable and super absorbent diaper pad comprises the following steps:

[0069] (a) placing the protective layer, the absorption layer and the anti-reverse osmosis layer into a mold from top to bottom, and then placing the mold into a hot press, setting the hot pressing temperature to 130° C., the pressure to 6 MPa, and the hot pressing time to 15 s, so that the three layers of materials are bonded to each other to form a tight structure, thereby obtaining a primary product;

[0070] (b) taking the primary product out of the mold, cutting it into a designed size using a cutting device, and then sealing the edge of the gasket to obtain the diaper gasket.

[0071] Comparative Example 1

[0072] The difference between this comparative example and Example 3 is that the highly breathable super absorbent diaper liner in the highly breathable super absorbent diaper liner is ordinary viscose fiber, and the rest is the same as Example 3.

[0073] Comparative Example 2

[0074] The difference between this comparative example and Example 3 is that the super absorbent fiber in the highly breathable super absorbent diaper pad is sodium polyacrylate fiber, and the rest is the same as Example 3.

[0075] Comparative Example 3

[0076] The difference between this comparative example and Example 3 is that 2,5-bis(aminomethyl)tetrahydrofuran is not added in step S3, and the rest is the same as Example 3.

[0077] Results Analysis

[0078] Examples 1-3 and Comparative Examples 1-3 were made into diaper pads according to the method of Example 4, and various performance tests were performed according to the following test examples.

[0079] Test Example 1

[0080] Absorption test

[0081] Immerse the diaper pad together with the clip in a constant temperature water bath filled with 10 cm deep artificial urine; when the diaper is completely immersed in artificial urine for 60 seconds, lift the clip and hang the diaper vertically for 90 seconds, then weigh its wet weight and calculate the liquid absorption rate of the diaper pad. Figure 1 .

[0082] Depend on Figure 1 The results show that Examples 1-3 exhibit excellent liquid absorption performance. From a structural perspective, in the three-layer nonwoven fabric structure, the specific disorder of the protective layer prompts the fibers to form a complex network structure, increasing the contact probability and area between urine and fibers, thereby accelerating the urine absorption rate. The absorption layer has sufficient gaps to accommodate liquid and ensure its uniform distribution. From the perspective of material modification, soybean protein is subjected to thiol grafting, thiol-ene click reaction with 12-bromo-1-dodecene, and subsequent reactions. The introduction of phosphate groups obtains amphiphilicity, which reduces the surface tension of urine and facilitates the spreading of urine on the fiber surface, and then quickly diffuses to the absorption layer. At the same time, the fiber containing the mannitol structure has good water absorption, and 2,5-bis(aminomethyl)tetrahydrofuran connects the hydrophilic side chain with sodium polyacrylate to form a network structure to improve water absorption. In addition, the increase in processing temperature causes the super absorbent fiber to form micelles, and the hydrophilic segment exposes more adsorption sites to enhance the liquid absorption capacity. These factors work together to make the liquid absorption rate of the embodiment better than that of the comparative example in the absorbency test.

[0083] Test Example 2

[0084] Air permeability test

[0085] According to the ASTM D737-2004 (2012) test method for air permeability of textiles, the air permeability of diaper pads was tested. The results are shown in Figure 2 .

[0086] Depend on Figure 2From the results, it can be seen that Examples 1-3 have good air permeability in the air permeability test. This is because the hydrophobic part of the amphiphilic soy protein after modification can prevent the liquid from blocking the gaps between fibers and ensure air circulation. In the absorption layer, the fibers containing the mannitol structure and hexafluorobutyl methacrylate work together to reduce the surface energy, and 2,5-bis(aminomethyl)tetrahydrofuran connects the hydrophilic side chains to form a network structure, and the gaps thereof are interconnected to form air circulation channels. The micelle structure formed by the superabsorbent fibers stabilizes the performance of the fibers in the liquid environment and maintains the stability of the air circulation channels, so that the examples perform well in terms of air permeability, meet the air permeability requirements of diaper pads, and avoid skin problems caused by poor air permeability.

[0087] Test Example 3

[0088] Impermeability test

[0089] The rewet and permeation of diaper pads were tested according to the test method of GB / T 28004.1-2021. The results are shown in Figure 3 .

[0090] In the anti-permeability test, Examples 1-3 showed excellent anti-permeability performance, which is due to the synergistic effect of the multi-layer structure and material modification. The high disorder of the anti-reverse osmosis layer makes the fibers arranged disorderly, increases the resistance to liquid passage, makes the liquid flow path tortuous, consumes its kinetic energy, and prevents reverse osmosis. The micellar structure of the superabsorbent fiber can stabilize the performance of the fiber in the liquid environment and avoid structural damage and fiber displacement caused by excessive water absorption. The two work together to control the back osmosis and permeation amounts within an ideal range, keep the skin dry, improve comfort, and effectively avoid problems caused by urine leakage.

[0091] Test Example 4

[0092] Antibacterial test

[0093] The antibacterial properties of diaper pads were tested according to the test method of GB 15979-2002. The results are shown in Figure 4 .

[0094] Examples 1-3 performed well in the antibacterial test and successfully introduced abundant phosphate groups into the soybean protein molecules, indicating that the phosphate groups introduced by modification can destroy the bacterial cell membrane structure or interfere with its metabolic process, effectively inhibiting the growth and reproduction of Staphylococcus aureus and Escherichia coli. This antibacterial function can reduce bacterial growth during the use of diaper pads, creating a healthy and hygienic use environment for users and reducing the risk of skin infection.

[0095] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0096] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A highly breathable and super absorbent diaper pad, characterized in that: The invention comprises a protective layer, an absorption layer and an anti-reverse osmosis layer from top to bottom, wherein the protective layer is composed of antibacterial modified soybean protein viscose fiber, polyester fiber and ES fiber, the absorption layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber, and the anti-reverse osmosis layer is composed of super absorbent fiber and antibacterial modified soybean protein viscose fiber; the antibacterial modified soybean protein viscose fiber is prepared by the following steps: (1) Adding soybean protein to deionized water, then adding 2-mercaptoethanol and sodium dodecylbenzene sulfonate in a water bath, reacting at 30-60°C for 1-3 hours to obtain thiol-grafted modified soybean protein, then adding 12-bromo-1-dodecene and diethylenetriamine penta(methylenephosphonic acid), reacting for 1-1.5 hours to obtain hydrophilic modified soybean protein; (2) adding polyvinyl alcohol to deionized water, then adding hydrophilic modified soybean protein and an initiator, stirring evenly, and then performing electrostatic spinning, and obtaining the antibacterial modified soybean protein viscose fiber after washing, dehydrating, and drying; The super absorbent fiber is prepared by the following steps: S1. Add sodium hydride to tetrahydrofuran under nitrogen atmosphere, slowly drop imidazo[1,2-A]pyridine-3-ylmethanol in a -5°C ice bath, return to room temperature after the dropwise addition is complete, react for 12-16 hours, then add dibromomannitol, continue to react for 3-5 hours, filter, concentrate the filtrate and add it to a mixed solution of excess petroleum ether and ethyl acetate, filter through diatomaceous earth, remove the solvent under reduced pressure, and obtain a block copolymer hydrophilic monomer; S2, adding benzylbis(triphenylphosphine)palladium chloride to toluene, adding block copolymer hydrophilic monomer after dissolving, maintaining 60-80°C for reaction for 12-24h, then adding hexafluorobutyl methacrylate, continuing the reaction for 12-24h, pouring the reaction solution into a large amount of methanol, filtering out the produced precipitate, and then drying in a vacuum drying oven at 60°C for 12-16h to obtain a block copolymer; S3, adding the block copolymer obtained in step 1 into tetrahydrofuran, adding 6-10% by mass of sodium polyacrylate aqueous solution, and then adding 2,5-bis(aminomethyl)tetrahydrofuran, reacting for 5-8 hours to obtain a spinning solution, and obtaining the super absorbent fiber by electrospinning.

2. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step (1), the mass ratio of soybean protein, deionized water, 2-mercaptoethanol, sodium dodecylbenzene sulfonate, 12-bromo-1-dodecene and diethylenetriaminepenta(methylenephosphonic acid) is 8-15:80-120:1.5-3:1.5-4:4.5-7:1.5-4.

3. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step (2), the mass ratio of polyvinyl alcohol, deionized water, hydrophilic modified soybean protein and initiator is 15-25:80-150:6-10:0.8-1.

5.

4. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step (2), the injection flow rate of the electrospinning is 0.1-0.5 mL / h, the voltage is 12-15 kV, and the distance from the nozzle to the collecting plate is 12-15 cm.

5. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step S1, the mass ratio of sodium cyanide, imidazo[1,2-A]pyridine-3-ylmethanol and dibromomannitol is 1-2.5:6-10:4-7.

6. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step S2, the mass ratio of benzylbis(triphenylphosphine)palladium chloride, toluene, block copolymer hydrophilic monomer, and hexafluorobutyl methacrylate is 0.05-0.2:100-150:10-20:4-8.

7. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In the step S3, the mass ratio of the block copolymer, tetrahydrofuran, 2,5-bis(aminomethyl)tetrahydrofuran, and sodium polyacrylate aqueous solution is 10-15:50-80:2.5-4:15-30.

8. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: In step S3, the extrusion speed of electrospinning is 2-4 mL / h, the distance from the needle to the receiving plate is 10-40 cm, and the rotation speed of the receiving plate is 500-800 r / min.

9. The highly breathable and super absorbent diaper pad according to claim 1, characterized in that: The content of antibacterial modified soybean protein viscose fiber in the protective layer is 50-70%, the content of polyester fiber is 10-30%, and the content of ES fiber is 10-30%; the content of super absorbent fiber in the absorption layer is 75%, and the content of antibacterial modified soybean protein viscose fiber is 25%; the content of super absorbent fiber in the anti-reverse osmosis layer is 65%, and the content of antibacterial modified soybean protein viscose fiber is 35%.

10. A method for preparing the highly breathable and super absorbent diaper pad according to any one of claims 1 to 9, characterized in that: The following steps are involved: (a) placing the protective layer, the absorption layer and the anti-reverse osmosis layer into a mold from top to bottom, and then placing the mold into a hot press, setting the hot pressing temperature to 130° C., the pressure to 6 MPa, and the hot pressing time to 15 s, so that the three layers of materials are bonded to each other to form a tight structure, thereby obtaining a primary product; (b) taking the primary product out of the mold, cutting it into a designed size using a cutting device, and then sealing the edge of the gasket to obtain the diaper gasket.

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