Deodorizing paper diaper with warning function and preparation method thereof

Abstract

The invention discloses a deodorization paper diaper with a warning function, and belongs to the technical field of adult paper diapers. The technical problem that in the prior art, an adult paper diaper cannot have the dual functions of deodorization and warning at the same time is solved. The invention discloses a deodorization paper diaper with a warning function. The deodorization paper diaper with the warning function structurally comprises a surface layer, a flow guide layer, an absorption core layer and a bottom film in sequence from top to bottom, the surface layer fabric is obtained by adding a composite indicator into an EVA hot melt adhesive, then coating the EVA hot melt adhesive to the surface of a cotton fabric, and cooling and curing; the composite indicator is trivalent cobalt / chitosan ligand / glycine o-cresol red. The absorption core layer is obtained by paving a deodorant on fluff pulp, and the deodorant is spherical weakly alkaline resin grafted with a monomer. The deodorizing paper diaper prepared by the invention has the advantages of warning amide and absorbing sulfide.

Description

Technical Field

[0001] This invention belongs to the field of adult diaper technology, specifically a deodorizing diaper with warning function and its preparation method. Background Technology

[0002] With the increasing aging of my country's population, the odor of excrement from elderly people requiring long-term care is receiving growing attention. The human olfactory organs can detect over four thousand odorous substances, among which compounds containing sulfur, nitrogen, and oxygen, such as hydrogen sulfide, thioether alcohols, trimethylamine, and indole, pose significant health risks. These substances can negatively impact the digestive, respiratory, circulatory, endocrine, and nervous systems to varying degrees. Odor-eliminating adult diapers not only effectively absorb excrement but also effectively control the odor directly from excrement and inhibit further odor formation during microbial growth, making them ideal care products.

[0003] Patent application CN113289047A discloses a diaper that can effectively fight bacteria and deodorize, with an absorbent core layer comprising bamboo charcoal fiber, antibacterial de-bonding agents, etc. The diaper disclosed in the aforementioned patent uses bamboo charcoal fiber to eliminate odor. However, its effectiveness in physically absorbing irritating gases such as hydrogen sulfide is limited.

[0004] Furthermore, when the body's health system is imbalanced, urine often contains excessive levels of urea and uric acid. Urea decomposes into ammonia through the action of intestinal bacteria; some of this ammonia is absorbed into the bloodstream and ultimately excreted into the urine through the kidneys. Ammonia has a strong, pungent odor and can serve as an indicator of health imbalances. Therefore, developing a diaper that can detect ammonia concentrations at a threshold level suitable for human health is of significant importance.

[0005] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a deodorizing diaper with a warning function, which solves the technical problem that existing adult diapers cannot have both deodorizing and warning functions.

[0007] The objective of this invention can be achieved through the following technical solutions: A deodorizing diaper with a warning function, wherein the deodorizing diaper with a warning function has a structure from top to bottom consisting of a top layer, a diversion layer, an absorbent core layer, and a bottom film; The surface fabric is obtained by adding a composite indicator to EVA hot melt adhesive, then coating it onto the surface of cotton fabric, and then cooling and curing it; the composite indicator is trivalent cobalt / chitosan ligand / glycine o-cresol red; The absorbent core layer is obtained by laying a deodorizing agent on a fluff pulp, and the deodorizing agent is a spherical weakly basic resin grafted with melamine and tetraethylenepentamine.

[0008] Furthermore, the method for preparing the surface fabric includes the following steps: A1. Chitosan is dissolved in acetic acid solution by stirring to obtain a chitosan solution; cobalt chloride is dissolved in deionized water by stirring to obtain a cobalt chloride aqueous solution; 3-5 wt% hydrogen peroxide solution is added dropwise to the cobalt chloride aqueous solution, and the solution is heated to 45-55℃ for 20-30 min to obtain an oxidized cobalt chloride solution; the oxidized cobalt chloride solution is added dropwise to the chitosan solution to obtain a mixture; the pH of the mixture is adjusted to 5-6, and the mixture is stirred at 45-55℃ for 4-6 h to obtain the reactant; When divalent cobalt chloride is oxidized to trivalent cobalt chloride by hydrogen peroxide, it is rapidly transferred into the chitosan solution to form trivalent cobalt chloride / chitosan ligands.

[0009] A2. The reactants are rotary evaporated, and then glycine o-cresol red is added to the reactants and mixed well to obtain a mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red; the mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red is centrifuged and all precipitates are collected; the precipitates are filtered through a 0.4-0.5 μm microporous membrane to obtain the product; the product is washed with water and dried to constant weight, which is the prepared composite indicator trivalent cobalt / chitosan ligand / glycine o-cresol red.

[0010] Trivalent cobalt / chitosan ligand and glycine o-cresol red form a composite indicator through electrostatic adsorption.

[0011] Further, in step A1, the concentration of the acetic acid solution is 1-1.5 wt%, the ratio of chitosan to acetic acid solution is 1-2 g: 30-50 mL; the ratio of cobalt chloride to deionized water is 0.3-0.6 g: 20-30 mL; the mass ratio of cobalt chloride aqueous solution to hydrogen peroxide aqueous solution is 25-35:1; and the ratio of oxidized cobalt chloride solution to chitosan solution is 20-30 mL: 30-50 mL.

[0012] Further, in step A2, the rotary evaporation pressure is -0.06~-0.08 MPa, the rotary evaporation temperature is 60-65℃, the mass ratio of reactant to glycine o-cresol red is 1-2:10, the centrifugation speed is 8000-10000 r / min, and the centrifugation time is 15-25 min.

[0013] Furthermore, the method for preparing the deodorant includes the following steps: B1. Add m-phenylenediamine to 35-38 wt% concentrated hydrochloric acid and stir until dissolved. Add formaldehyde at -9 to -5℃ and mix well to obtain the reaction system. React the reaction system for 10-15 min, then add melamine and tetraethylenepentamine and mix well to obtain a monomer mixture. B2. Mix the monomer mixture, dispersant and suspending agent, and perform suspension polymerization; the suspension polymerization temperature is 65-80℃ and the suspension polymerization time is 15-20min; then add sulfonated carbon, mix well, let stand, filter, and collect the solid; wash the solid with water and dry it to constant weight to obtain the prepared deodorant.

[0014] m-Phenylenediamine and formaldehyde undergo condensation polymerization, followed by the addition of melamine and tetraethylenepentamine for further condensation polymerization. This is then suspended in hydrochloric acid solution to produce a spherical, weakly basic resin. This spherical, weakly basic resin contains multiple amino active functional groups, readily absorbing odorous substances such as hydrogen sulfide. It also possesses strong adsorption capabilities, resulting in a physical deodorization effect.

[0015] The reaction formula for the condensation polymerization of m-phenylenediamine and formaldehyde is as follows:

[0016] The reaction between spherical weakly basic resin and melamine and tetraethylenepentamine is shown in the following reaction formula:

[0017] Furthermore, in step B1, the ratio of m-phenylenediamine, concentrated hydrochloric acid, formaldehyde, melamine, and tetraethylenepentamine is 5.4-10.8g:100mL:3-6g:3-6g:3-5g.

[0018] Further, in step B2, the weight ratio of the monomer mixture, dispersant, suspending agent and sulfonated carbon is 10:3-4:0.05:10-20; the standing time is 2-4 hours.

[0019] Furthermore, when preparing the surface layer, the mass ratio of the composite indicator, EVA hot melt adhesive, and cotton fabric is X:4:20; where 1≤X≤4, and X is an integer; the drying and curing temperature is 80-85℃, and the drying and curing time is 5-10 minutes. The mass ratio of the fluff pulp and deodorant is 10-20:1.

[0020] Furthermore, the bottom membrane is made of PE, and the flow guiding layer is made of nonwoven fabric made of polypropylene.

[0021] The present invention has the following beneficial effects: 1. The diaper prepared by this invention is a composite structure made of multiple layers of materials, including a top layer, a distribution layer, an absorbent core layer, and a bottom film, all of which are bonded together with EVA hot melt adhesive. PE is used as the bottom film, providing good waterproof and weather-resistant performance. The top layer is made of soft and comfortable cotton fabric, and a composite indicator is added to warn of excessive ammonia. This invention uses chitosan as a ligand for trivalent cobalt ions to improve the stability of trivalent cobalt. Glycine o-cresol red can also undergo a coordination reaction with metallic cobalt to form a deep red complex. Therefore, the trivalent cobalt / chitosan ligand / glycine o-cresol red mixture serves as an indicator, with an initial color of red. When excessive ammonia gas is released into the top layer material, the high concentration of ammonia, the -NH bonds in urea, and the amino groups can cause trivalent cobalt to detach from its original ligand through electrostatic attraction, forming a complex that ultimately turns orange, with a stability far exceeding that of its original ligand and complex. Therefore, when the color of the top layer indicator changes from red to orange, it indicates that excessive ammonia gas has been generated in the environment. This invention can alert to different concentrations of ammonia by adjusting the mass ratio of composite indicator, EVA hot melt adhesive and cotton fabric.

[0022] 2. This invention incorporates a deodorant in the absorbent core material of the diaper to eliminate irritating gases such as sulfides. Formaldehyde and m-phenylenediamine first undergo a condensation reaction, followed by grafting of melamine and tetraethylenepentamine monomers. The addition of the melamine graft further enhances the absorbency of the deodorant, while tetraethylenepentamine provides multiple coordination sites with sulfides in the resulting spherical structures. Sulfonated carbon adsorbs the aforementioned spherical, weakly basic resin, thus forming the deodorant. Sulfonated carbon itself can physically absorb various irritating gases. The diaper prepared by this invention can provide advance warning of excessive ammonia production and then eliminate odorous substances such as sulfides through a dual physical / chemical adsorption process, inhibiting the proliferation of microorganisms and bacteria and preventing excessive harm to the human body. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] The chitosan used in Examples 1-3 of this invention was purchased from Qingdao Hehai Biotechnology Co., Ltd., specifically refined chitosan with a particle size of 100 mesh and a viscosity of 100 cps; the cobalt chloride used in Examples 1-3 of this invention was purchased from Baoding Fusai Cobalt Nickel New Materials Co., Ltd.; the activated carbon used in Example 4 of this invention was purchased from Jinmansen Environmental Protection Technology Co., Ltd., specifically granular activated carbon with a particle size of 50 mesh and a bulk density of 0.45 g / cm³. 3The starch used in Examples 5-7 of this invention was purchased from Langfang Qianyao Technology Co., Ltd.; the EVA hot melt adhesive used in Examples 8-10 of this invention was purchased from Dongguan Junji Plastics Co., Ltd., and its grade is 220. Example 1

[0025] This embodiment provides a method for preparing the surface fabric of a deodorizing diaper with a warning function, including the following steps: A1. Weigh 1g of chitosan and add it to 30mL of 1wt% acetic acid solution. Stir and dissolve at 20℃ to obtain a chitosan solution. Add 0.3g of cobalt chloride to 20mL of deionized water and stir to dissolve to obtain a cobalt chloride aqueous solution. Add 3wt% hydrogen peroxide solution dropwise to the cobalt chloride aqueous solution at a mass ratio of 25:1, and then heat to 45℃ for 20min to oxidize, obtaining an oxidized cobalt chloride solution. Add 20mL of the oxidized cobalt chloride solution dropwise to 30mL of chitosan solution to obtain a mixture. Adjust the pH of the mixture to 5 using 1mol / L NaOH solution, and stir the reaction at 45℃ for 4h to obtain the reactants.

[0026] A2. The reactants were rotary evaporated at -0.06 MPa and 60 °C to 30% of their original volume. Glycine o-cresol red was added to the reactants at a mass ratio of 1:10 and mixed thoroughly to obtain a mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red. The above-mentioned cobalt / glycine o-cresol red mixture was centrifuged at 8000 r / min for 15 min, and all precipitates were collected. The precipitates were filtered through a 0.5 μm microporous membrane to obtain the product. The product was washed with water and dried at 80 °C to constant weight, which is the prepared composite indicator trivalent cobalt / chitosan ligand / glycine o-cresol red.

[0027] A3. The composite indicator is added to the EVA hot melt adhesive and mixed evenly, and then applied to the surface of the cotton fabric. The mass ratio of the composite indicator, EVA hot melt adhesive and cotton fabric is 1:4:20. After cooling and curing, it becomes the prepared surface material. Example 2

[0028] This embodiment provides a method for preparing the surface fabric of a deodorizing diaper with a warning function, including the following steps: A1. Weigh 1.5g of chitosan and add it to 45mL of 1.2wt% acetic acid solution. Stir and dissolve at 25℃ to obtain a chitosan solution. Add 0.5g of cobalt chloride to 25mL of deionized water and stir to dissolve to obtain a cobalt chloride aqueous solution. Add 4wt% hydrogen peroxide solution dropwise to the cobalt chloride aqueous solution at a mass ratio of 30:1, and then heat to 50℃ for 25min to oxidize, obtaining an oxidized cobalt chloride solution. Add 25mL of the oxidized cobalt chloride solution dropwise to 40mL of chitosan solution to obtain a mixture. Adjust the pH of the mixture to 5.5 using 1.5mol / L NaOH solution, and stir the reaction at 50℃ for 5h to obtain the reactants.

[0029] A2. The reactants were rotary evaporated to 35% of their original volume at -0.07 MPa and 63 °C. Glycine o-cresol red was added to the reactants at a mass ratio of 1:10 and mixed thoroughly to obtain a mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red. The above-mentioned cobalt / glycine o-cresol red mixture was centrifuged at 9000 r / min for 20 min, and all precipitates were collected. The precipitates were filtered through a 0.45 μm microporous membrane to obtain the product. The product was washed with water and dried at 80 °C to constant weight, which is the prepared composite indicator trivalent cobalt / chitosan ligand / glycine o-cresol red.

[0030] A3. Mix the composite indicator with EVA hot melt adhesive, then apply it to the surface of the cotton fabric; the mass ratio of composite indicator, EVA hot melt adhesive and cotton fabric is 2:4:20. Dry and cure at 82℃ for 6 minutes to obtain the prepared surface material. Example 3

[0031] This embodiment provides a method for preparing the surface fabric of a deodorizing diaper with a warning function, including the following steps: A1. Weigh 2g of chitosan and add it to 50mL of 1.5wt% acetic acid solution. Stir and dissolve at 30℃ to obtain a chitosan solution. Add 0.6g of cobalt chloride to 30mL of deionized water and stir to dissolve to obtain a cobalt chloride aqueous solution. Add 5wt% hydrogen peroxide solution dropwise to the cobalt chloride aqueous solution at a mass ratio of 35:1, and then heat to 55℃ for 30min to oxidize, obtaining an oxidized cobalt chloride solution. Add 30mL of the oxidized cobalt chloride solution dropwise to 50mL of chitosan solution to obtain a mixture. Adjust the pH of the mixture to 6 using 2mol / L NaOH solution, and stir the reaction at 55℃ for 6h to obtain the reactants.

[0032] A2. The reactants were rotary evaporated to 40% of their original volume at -0.08 MPa and 65 °C. Glycine o-cresol red was added to the reactants at a mass ratio of 2:10 and mixed thoroughly to obtain a mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red. The above-mentioned cobalt / glycine o-cresol red mixture was centrifuged at 10000 r / min for 25 min, and all precipitates were collected. The precipitates were filtered through a 0.4 μm microporous membrane to obtain the product. The product was washed with water and dried at 80 °C to constant weight, which is the prepared composite indicator trivalent cobalt / chitosan ligand / glycine o-cresol red.

[0033] A3. Mix the composite indicator with EVA hot melt adhesive, then apply it to the surface of the cotton fabric; the mass ratio of composite indicator, EVA hot melt adhesive, and cotton fabric is 4:4:20. Dry and cure at 85℃ for 10 minutes to obtain the prepared surface material. Example 4

[0034] Add 5g of activated carbon to 30mL of 5mol / L sulfuric acid and soak at 50℃ for 24h. After filtration, wash the solid with distilled water until the pH value is 7, and dry it in an oven at 80℃ to constant weight to obtain the prepared sulfonated carbon. Example 5

[0035] This embodiment provides a method for preparing a deodorant for deodorizing diapers with a warning function, including the following steps: B1. Select a 150mL three-necked flask equipped with a stirrer, a serpentine condenser, and a thermometer. Add 5.4g of m-phenylenediamine and 100mL of 35wt% concentrated hydrochloric acid to the flask, and stir until the m-phenylenediamine dissolves. Place the flask in an ice bath at -5℃, and then add 3g of formaldehyde. Mix well to obtain the reaction system. React the reaction system with stirring for 10 minutes to obtain spherical weakly basic resin. Then add 3g of melamine and 3g of tetraethylenepentamine to the three-necked flask, mix well, and obtain a monomer mixture.

[0036] B2. By weight, 10 parts of the monomer mixture and 3 parts of turbine oil were mixed and added to a beaker, followed by 0.05 parts of starch for suspension polymerization. The suspension polymerization time was 15 minutes, and the temperature was 65°C. At this time, the formation of uniform spheres could be observed. Then, 10 parts of the sulfonated carbon prepared in Example 4 were added to the beaker, mixed well, and allowed to stand for 2 hours. After filtration, the solid was collected. The solid was washed with water and dried at 80°C to constant weight to obtain the prepared deodorant. Example 6

[0037] This embodiment provides a method for preparing a deodorant for deodorizing diapers with a warning function, including the following steps: B1. Select a 150mL three-necked flask equipped with a stirrer, a serpentine condenser, and a thermometer. Add 8.1g of m-phenylenediamine and 100mL of 37wt% concentrated hydrochloric acid to the flask, and stir until the m-phenylenediamine dissolves. Place the flask in an ice bath at -6℃, and then add 5g of formaldehyde. Mix well to obtain the reaction system. React the reaction system with stirring for 12 minutes to obtain spherical weakly basic resin. Then add 5g of melamine and 4g of tetraethylenepentamine to the three-necked flask and mix well to obtain a monomer mixture.

[0038] B2. By weight, 10 parts of the monomer mixture and 4 parts of turbine oil were mixed and added to a beaker, followed by 0.05 parts of starch for suspension polymerization. The suspension polymerization time was 18 minutes, and the temperature was 75°C. At this point, the formation of uniform spheres could be observed. Then, 15 parts of the sulfonated carbon prepared in Example 4 were added to the beaker, mixed well, and allowed to stand for 3 hours. After filtration, the solid was collected. The solid was washed with water and dried at 82°C to constant weight to obtain the prepared deodorant. Example 7

[0039] This embodiment provides a method for preparing a deodorant for deodorizing diapers with a warning function, including the following steps: B1. Select a 150mL three-necked flask equipped with a stirrer, a serpentine condenser, and a thermometer. Add 10.8g of m-phenylenediamine and 100mL of 38wt% concentrated hydrochloric acid to the flask, and stir until the m-phenylenediamine dissolves. Place the flask in an ice bath at -9℃, and then add 6g of formaldehyde. Mix well to obtain the reaction system. React the reaction system with stirring for 15 minutes to obtain spherical weakly basic resin. Then add 6g of melamine and 5g of tetraethylenepentamine to the three-necked flask, mix well, and obtain a monomer mixture.

[0040] B2. By weight, 10 parts of the monomer mixture and 4 parts of turbine oil were mixed and added to a beaker, followed by 0.05 parts of starch for suspension polymerization. The suspension polymerization time was 20 minutes, and the temperature was 80°C. At this time, the formation of uniform spheres could be observed. Then, 20 parts of the sulfonated carbon prepared in Example 5 were added to the beaker, mixed well, and allowed to stand for 4 hours. After filtration, the solid was collected. The solid was washed with water and dried at 85°C to constant weight, which is the prepared deodorant. Example 8

[0041] This embodiment provides a method for preparing deodorizing diapers with warning function, including the following steps: S1. The absorbent core layer is made of fluff pulp, and the deodorant prepared in Example 6 is laid on the surface of the fluff pulp. The mass ratio of fluff pulp to deodorant is 10:1.

[0042] S2. The top layer, flow guiding layer, absorbent core layer, and bottom film prepared in Example 2 are arranged sequentially from top to bottom, and the layers are bonded together with EVA hot melt adhesive. Among them, the bottom film is made of PE; the flow guiding layer is a non-woven fabric made of polypropylene. Example 9

[0043] This embodiment provides a method for preparing deodorizing diapers with warning function, including the following steps: S1. The absorbent core layer is made of fluff pulp, and the deodorant prepared in Example 7 is laid on the surface of the fluff pulp. The mass ratio of fluff pulp to deodorant is 15:1.

[0044] S2. The top layer, flow guiding layer, absorbent core layer, and bottom film prepared in Example 3 are arranged sequentially from top to bottom, and the layers are bonded together with EVA hot melt adhesive. Among them, the bottom film is made of PE; the flow guiding layer is a non-woven fabric made of polypropylene. Example 10

[0045] This embodiment provides a method for preparing deodorizing diapers with warning function, including the following steps: S1. The absorbent core layer is made of fluff pulp, and the deodorant prepared in Example 7 is laid on the surface of the fluff pulp. The mass ratio of fluff pulp to deodorant is 20:1.

[0046] S2. The top layer, flow guiding layer, absorbent core layer, and bottom film prepared in Example 3 are arranged sequentially from top to bottom, and the layers are bonded together with EVA hot melt adhesive. Among them, the bottom film is made of PE; the flow guiding layer is a non-woven fabric made of polypropylene.

[0047] Comparative Example 1 The difference between this comparative example and Example 10 is that, in step A1 of preparing the surface fabric, hydrogen peroxide solution was not added to the cobalt chloride aqueous solution. An equal mass of cobalt chloride aqueous solution was used instead of the oxidized cobalt chloride solution.

[0048] Comparative Example 2 The difference between this comparative example and Example 10 is that step A2 is omitted when preparing the surface fabric.

[0049] Comparative Example 3 The difference between this comparative example and Example 10 is that, in step B1 of preparing the deodorant, 9g of... Melamine replaces 5g of melamine and 4g of tetraethylenepentamine.

[0050] Comparative Example 4 The difference between this comparative example and Example 10 is that, in step B1 of preparing the deodorant, 9g of tetraethylenepentamine is used instead of 5g of melamine and 4g of tetraethylenepentamine.

[0051] Performance testing: 1. Clean the 6L PVC sampling bag containing the sample three times with nitrogen gas, then evacuate using a vacuum pump. Add 0.6L of hydrogen sulfide gas and 5.4L of nitrogen gas to the sampling bag for hydrogen sulfide testing; 0.3L of methanethiol gas and 5.7L of nitrogen gas for methanethiol testing; and 0.1L of trimethylamine gas and 5.9L of nitrogen gas for trimethylamine testing. Add 20g of the deodorizing diaper sample with warning function prepared in Examples 8-10 to the sampling bag sequentially. Seal the sampling bag and place it in an oven at 37°C for 1 hour to obtain the gas to be tested. Detect the gas using mass spectrometry, record the sample results, and calculate the elimination rate; simultaneously, perform blank sample tests without the sample.

[0052] Elimination rate (%) = (Known concentration - Current concentration) / Known concentration × 100% 2. Ammonia and nitrogen cylinders were connected to a mixing tank via pipelines to form an ammonia-nitrogen mixture, with a mass ratio of ammonia to nitrogen of 20:80. A 50mL trough-shaped chamber was selected as the simulation device. 10mg of the deodorizing diapers with warning functions prepared in Examples 8-10 and Comparative Examples 1-4 were added sequentially to the simulation device. The mixing tank injected gas into the simulation device at a rate of 2mL / min. When the color of the deodorizing diaper changed from dark red to orange, it was considered that the warning had begun, and the time from the start of gas release to the start of the warning was recorded (referred to as the warning duration). A water tank was connected to the experimental simulation device as a protective device for ammonia recovery. Specific test results are shown in Table 1.

[0053] Table 1. Sample Performance Test Data

[0054] Data Analysis: The deodorizing diapers with warning function prepared in Examples 8-10 of this invention exhibit excellent absorption efficiency for sulfides such as hydrogen sulfide, methanethiol, and trimethylamine, as well as irritating gases. In Comparative Example 3, melamine was used instead of tetraethylenepentamine as a grafting agent; tetraethylenepentamine can undergo coordination reactions with sulfides, which helps the deodorant better absorb irritating gases such as hydrogen sulfide; therefore, the absorption effect of Comparative Example 3 on various irritating gases is worse, and the elimination rate is reduced. In Comparative Example 4, tetraethylenepentamine was used instead of melamine as a grafting agent; melamine can further improve the adsorption performance of formaldehyde and m-phenylenediamine condensate, resulting in better physical adsorption of gases. Therefore, the deodorant prepared in Comparative Example 4 has a worse absorption effect on various irritating gases.

[0055] In Comparative Example 1, divalent cobalt was not oxidized to trivalent cobalt. Divalent cobalt can undergo coordination reactions with both amino groups and ammonia, but its coordination ability is weak. Discoloration occurs when insufficient ammonia gas is generated in the environment to trigger a warning. In Comparative Example 2, a chitosan / cobalt chloride complex was used instead of the trivalent cobalt / chitosan ligand / glycine o-cresol red mixture during the preparation of the surface fabric. Glycine o-cresol red itself can also coordinate with trivalent cobalt; therefore, the warning time for ammonia gas in Comparative Example 3 was significantly shortened.

[0056] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0057] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A deodorizing diaper with a warning function, characterized in that: The deodorizing diaper with warning function has a structure from top to bottom consisting of a top layer, a diversion layer, an absorbent core layer, and a bottom film. The surface fabric is obtained by adding a composite indicator to EVA hot melt adhesive, then coating it onto the surface of cotton fabric and cooling and curing it; the composite indicator is trivalent cobalt / chitosan ligand / glycine o-cresol red; The absorbent core layer is obtained by laying a deodorizing agent on a fluff pulp, and the deodorizing agent is a spherical weakly basic resin grafted with melamine and tetraethylenepentamine.

2. The deodorizing diaper with warning function according to claim 1, characterized in that, The method for preparing the surface fabric includes the following steps: A1. Chitosan is added to acetic acid solution and stirred to dissolve, obtaining a chitosan solution; cobalt chloride is added to deionized water and stirred to dissolve, obtaining a cobalt chloride aqueous solution; the cobalt chloride aqueous solution is oxidized to obtain an oxidized cobalt chloride solution; the oxidized cobalt chloride solution is added dropwise to the chitosan solution to obtain a mixture; the pH of the mixture is adjusted to 5-6, and the mixture is stirred at 45-55℃ for 4-6 hours to obtain the reactants; A2. The reactants are rotary evaporated, and then glycine o-cresol red is added to the reactants and mixed well to obtain a mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red; the mixture of trivalent cobalt / chitosan ligand / glycine o-cresol red is centrifuged and all precipitates are collected; all precipitates are filtered through a 0.4-0.5 μm microporous membrane to obtain the product; the product is washed with water and dried to constant weight, which is the prepared composite indicator.

3. The deodorizing diaper with warning function according to claim 2, characterized in that, In step A1, the concentration of the acetic acid solution is 1-1.5 wt%, the ratio of chitosan to acetic acid solution is 1-2 g: 30-50 mL, the ratio of cobalt chloride to deionized water is 0.3-0.6 g: 20-30 mL, the mass ratio of cobalt chloride aqueous solution to hydrogen peroxide aqueous solution is 25-35:1, and the ratio of oxidized cobalt chloride solution to chitosan solution is 20-30 mL: 30-50 mL.

4. A deodorizing diaper with an alert function according to claim 2, characterized in that, In step A2, the rotary evaporation pressure is -0.06 to -0.08 MPa, the rotary evaporation temperature is 60-65℃, the mass ratio of reactant to glycine o-cresol red is 1-2:10, the centrifugation speed is 8000-10000 r / min, and the centrifugation time is 15-25 min.

5. A deodorizing diaper with an alert function according to claim 1, characterized in that, The method for preparing the deodorant includes the following steps: B1. Add m-phenylenediamine to 35-38 wt% concentrated hydrochloric acid and stir until dissolved. Add formaldehyde at -9 to -5℃ and mix well to obtain the reaction system. React the reaction system for 10-15 min, then add melamine and tetraethylenepentamine and mix well to obtain a monomer mixture. B2. Mix the monomer mixture, dispersant and suspending agent, and perform suspension polymerization; the suspension polymerization temperature is 65-80℃ and the suspension polymerization time is 15-20min; then add sulfonated carbon, mix well, let stand, filter, and collect the solid; wash the solid with water and dry it to constant weight to obtain the prepared deodorant.

6. A deodorizing diaper with an alert function according to claim 5, characterized in that, In step B1, the ratio of m-phenylenediamine, concentrated hydrochloric acid, formaldehyde, melamine and tetraethylenepentamine is 5.4-10.8g:100mL:3-6g:3-6g:3-5g.

7. A deodorizing diaper with an alert function according to claim 5, characterized in that, In step B2, the weight ratio of the monomer mixture, dispersant, suspending agent and sulfonated carbon is 10:3-4:0.05:10-20; the standing time is 2-4 hours.

8. A deodorizing diaper with an alert function according to claim 1, characterized in that, When preparing the surface layer, the mass ratio of the composite indicator, EVA hot melt adhesive, and cotton fabric is X:4:20; where 1≤X≤4, and X is an integer; the cooling and curing temperature is 25-30℃, and the cooling and curing time is 3-5min; the mass ratio of the fluff pulp and deodorant is 10-20:

1.

9. A deodorizing diaper with an alert function according to claim 1, characterized in that, The bottom membrane is made of PE, and the flow guiding layer is made of nonwoven fabric made of polypropylene.

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