Composite core diapers with improved antibacterial and water absorption properties

Abstract

The application provides a composite core diaper with improved antibacterial and water absorption performance, the diaper comprising a highly absorbent antibacterial composite core, characterized in that the highly absorbent antibacterial composite core is composed of a sequentially stacked infiltration layer, a polymer layer 1, a guide layer, a polymer layer 2, and a diffusion layer; the polymer layer 1 and / or the polymer layer 2 is made of a sodium acrylate-acrylamide composite water-absorbing material to which chitosan quaternary ammonium salt is added. The highly absorbent antibacterial composite core of the present application has a strong water absorption capacity, especially a strong urine absorption capacity, and can fully release the chitosan quaternary ammonium salt to achieve a good antibacterial effect.

Description

Field of the Invention

[0001] The present application belongs to the field of sanitary products and polymer materials, and specifically, to a composite core diaper with improved antibacterial and water absorption properties. Background Art

[0002] Diapers, urine pads and other products are among the most popular personal hygiene care products on the market. Currently, these products mostly use multi-layer composite cores, and the most critical component of the core is super absorbent resin, which is mainly required in terms of liquid absorption and antibacterial properties.

[0003] The super absorbent resin materials currently used in the market absorb a large amount of water, which can reach hundreds of times their own weight, but their ability to absorb urine is generally less than one-tenth of their water absorption capacity. Although the absorption requirements can be met by increasing the filling amount, on the one hand, this approach will inevitably make the product thick; on the other hand, products that are too thick often have defects in absorption speed.

[0004] Therefore, there is still a need to improve the liquid absorption capacity of composite cores, especially the urine absorption capacity, while maintaining antibacterial properties. Summary of the invention

[0005] In order to improve the above-mentioned defects of the existing absorbent core, on the one hand, the present application provides a composite core diaper with improved antibacterial and water absorption properties, wherein the diaper comprises a highly absorbent antibacterial composite core, wherein the highly absorbent antibacterial composite core is composed of a permeation layer, a polymer layer 1, a guide layer, a polymer layer 2 and a diffusion layer stacked in sequence; the polymer layer 1 and / or the polymer layer 2 are made of agar-sodium acrylate-acrylamide composite absorbent material to which chitosan quaternary ammonium salt is added.

[0006] Furthermore, the polymer layer 2 of the highly water-absorbent antibacterial composite core is made of agar-sodium acrylate-acrylamide composite water-absorbent material added with chitosan quaternary ammonium salt.

[0007] Furthermore, the material of the infiltration layer can be selected from one or more of dust-free paper, hot air cloth, spunbond cloth, spunlace cloth, and toilet paper; the material of the guide layer is fluffy non-woven fabric; the material of the diffusion layer can be selected from one or more of dust-free paper, hot air cloth, spunbond cloth, spunlace cloth, and toilet paper.

[0008] Furthermore, the agar-sodium acrylate-acrylamide composite water-absorbing material added with chitosan quaternary ammonium salt is prepared by polymerizing sodium acrylate-acrylamide, and agar and chitosan quaternary ammonium salt are added during the polymerization process.

[0009] Furthermore, the agar-sodium acrylate-acrylamide composite water-absorbing material added with chitosan quaternary ammonium salt is prepared by the following method:

[0010] 0.3 g of agar is weighed, heated and dissolved in 25 mL of distilled water to obtain an agar solution; 8 g of sodium hydroxide is weighed and dissolved in 50 mL of distilled water to obtain a sodium hydroxide solution; 20 g of acrylic acid is slowly added to the sodium hydroxide solution in an ice bath to obtain a partially neutralized acrylic acid solution; 7 g of acrylamide, 0.2 g of chitosan quaternary ammonium salt and 0.005 g of N,N'-methylenebisacrylamide are added to the partially neutralized acrylic acid solution, mixed evenly and then added to the agar solution; 0.03 g of potassium persulfate and 0.02 g of sodium bisulfite are added dropwise, and the mixture is placed in a constant temperature water bath at 35 degrees Celsius for reaction for 3 hours; the product is dried and crushed to obtain an agar-sodium acrylate-acrylamide composite water-absorbing material with chitosan quaternary ammonium salt added thereto.

[0011] Furthermore, the agar is hydroxyethylated modified agar, and the hydroxyethylated modified agar is obtained by hydroxyethylating agar with ethylene oxide.

[0012] Further, the hydroxyethylated modified agar is prepared by the following method:

[0013] Mix 10 grams of agar powder, 20 grams of anhydrous sodium sulfate and 60 mL of water in a reaction container; add 2 mL of 0.2 mol / L sodium borohydride and react for 20 minutes; add 20 mL of 5% w / v sodium hydroxide solution, flush nitrogen into the reaction container, add 8 mL of ethylene oxide, and react at 70 degrees Celsius for 10 minutes; add 200 mL of distilled water, adjust the pH to about 7.0 with glacial acetic acid, filter the solid, wash with distilled water, dry and crush to obtain hydroxyethyl agar.

[0014] On the other hand, the present application provides the use of the above-mentioned highly water-absorbent antibacterial composite core in the preparation of personal hygiene products.

[0015] Furthermore, the personal hygiene product is a diaper.

[0016] In addition, the highly water-absorbent antibacterial composite core of the present application can also be used for urine-isolating pads, sanitary napkins, surgical absorbent pads, etc. after appropriate improvements.

[0017] Since the amounts of various ingredients vary greatly, using parts to indicate the amount of various reagents is confusing. The claims of this application use the specific weight grams in actual experiments to define the amounts of various reagents. Those skilled in the art will understand that technical solutions that scale up or down the reaction scale according to the gram ratio are also within the scope of protection of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the composite absorbent core. DETAILED DESCRIPTION

[0019] The following implementation modes are only used to demonstrate the feasibility and effect of the technical solution of the present application, and are not intended to limit the protection scope of the present application. The protection scope of the present application is only limited by the claims.

[0020] Test Method

[0021] Liquid absorption performance test

[0022] When testing the liquid aspiration speed:

[0023] Weigh a certain weight of dry resin and place it in a nylon bag. Immerse the nylon bag in sufficient liquid, take it out and weigh it every 5 or 10 minutes, calculate the liquid absorption rate (g / g), and take the average value of 3 parallel experiments.

[0024] When testing total liquid absorption performance:

[0025] Weigh a certain weight of dry resin, place it in a beaker, add sufficient liquid, wait for one hour for the resin to fully absorb water and swell, filter out the liquid and weigh it, calculate the liquid absorption rate g / g, and test 3 times and take the average value.

[0026] The liquids used in the absorbency test include:

[0027] Purified water: Wahaha brand;

[0028] Normal saline: 0.9% w / v sodium chloride in purified water;

[0029] Artificial urine: A pure aqueous solution containing 2% w / v urea, 1% w / v sodium chloride, 0.05% w / v calcium chloride, and 0.1% w / v magnesium sulfate.

[0030] Antibacterial performance test:

[0031] Design method based on the requirements of ISO 22196:

[0032] The bacterial species were Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922), which were spread and inoculated on LB medium plates; about 0.1 g of resin sample was crushed and pressed into a nearly circular piece with a diameter of about 1 cm, which was sterilized by ultraviolet light for 3 minutes and then placed in the center of the plate; the plate was cultured at 37 degrees Celsius for 24 hours, the diameter of the inhibition zone was measured, and the average of 3 parallel experiments was taken.

[0033] Main Materials

[0034] Agar powder: food grade, Shaanxi Chenming Biotechnology Co., Ltd.

[0035] Sodium acrylate, acrylamide: Jinan Yuanyang Chemical Co., Ltd.

[0036] Chitosan quaternary ammonium salt: Shaanxi Tangyao Biotechnology Co., Ltd.

[0037] Other reagents were all conventional domestically produced.

[0038] Embodiment 1 Preparation of agar-sodium acrylate-acrylamide composite water-absorbing material

[0039] Referring to the previous research of partners, the applicant manufactured agar-sodium acrylate-acrylamide composite water-absorbing material with antibacterial properties. The preparation method after optimizing various factors is as follows:

[0040] Weigh 0.3g agar and heat it to dissolve in 25mL distilled water to obtain an agar solution; weigh 8g sodium hydroxide and dissolve it in 50mL distilled water to obtain a sodium hydroxide solution; slowly add 20g acrylic acid to the sodium hydroxide solution in an ice bath; add 7g acrylamide, 0.2g chitosan quaternary ammonium salt, 0.005g N,N'-methylenebisacrylamide, mix well and then add the agar solution; dropwise add 0.03g potassium persulfate and 0.02g sodium bisulfite, place in a constant temperature water bath to react for 3 hours; dry and crush the product to obtain a composite water-absorbing material. The properties are shown in Table 1.

[0041] Table 1 Performance comparison of agar-sodium acrylate-acrylamide composite water-absorbing material and similar materials without agar

[0042] Material Water absorption Saline absorption rate Artificial urine intake rate Staphylococcus aureus inhibition zone Escherichia coli inhibition zone Agar-sodium acrylate-acrylamide composite water-absorbing material 975g / g 141 g / g 43g / g 2.1cm No obvious inhibition zone was observed Sodium acrylate-acrylamide composite water-absorbent material 731 g / g 125 g / g 51 g / g 3.7cm 1.8cm

[0043] The agar-sodium acrylate-acrylamide composite absorbent material has a water absorption performance of 975 g / g, a physiological saline absorption performance of 141 g / g, and an artificial urine absorption performance of 43 g / g; compared with the similar material without agar (the amount of initiator and cross-linking agent is slightly adjusted), the water absorption performance of about 730 g / g has been significantly improved, but the artificial urine absorption performance has obvious defects, even slightly lower than the level of about 50 g / g of similar materials without agar. In addition, the addition of agar significantly reduces the antibacterial performance of the product, and even no antibacterial zone can be detected on Escherichia coli (according to the existing reports of similar materials, although it is known that the performance of Escherichia coli is not as good as that of Staphylococcus aureus, obvious antibacterial zones can generally be observed).

[0044] Example 2 Modification of agar

[0045] Regarding the problem that the water absorption performance of the material in Example 1 is improved, but the artificial urine absorption performance is poor; the applicant considers that the reason may be that the large amount of urea and salt in artificial urine brings about changes in local osmotic pressure and cross-linking density; and the local coagulation of agar causes the poor release of chitosan quaternary ammonium salt.

[0046] Since the properties and preparation process of sodium acrylate-acrylamide materials are relatively mature, the applicant considered improving the above problems by modifying agar materials. The applicant tried physical modification, carboxymethylation, hydroxyethylation, and hydroxypropylation of agar, and found that hydroxyethylation-modified agar can solve the above problems to a large extent, while other modification methods have no obvious improvement on the absorption of artificial urine. Except for hydroxypropylation modification, other modification methods have no obvious improvement on the antibacterial effect.

[0047] Preparation method of hydroxyethyl agar

[0048] Mix 10 grams of agar powder, 20 grams of anhydrous sodium sulfate and 60 mL of water in a reaction container; add 2 mL of 0.2 mol / L sodium borohydride and react for 20 minutes; add 20 mL of 5% w / v sodium hydroxide solution, flush nitrogen into the reaction container, add 8 mL of ethylene oxide, and react at 70 degrees Celsius for 10 minutes; add 200 mL of distilled water, adjust the pH to about 7.0 with glacial acetic acid, filter the solid, wash with distilled water, dry and crush to obtain hydroxyethyl agar.

[0049] Referring to the method in Example 1, the above hydroxyethyl agar was used to prepare agar-sodium acrylate-acrylamide composite water-absorbing material:

[0050] Weigh 0.3g of hydroxyethyl agar and heat it to dissolve it in 25mL of distilled water to obtain an agar solution; weigh 8g of sodium hydroxide and dissolve it in 50mL of distilled water to obtain a sodium hydroxide solution; slowly add 20g of acrylic acid to the above sodium hydroxide solution in an ice bath; add 7g of acrylamide, 0.2g of chitosan quaternary ammonium salt, and 0.008g of N,N'-methylenebisacrylamide, mix well and then add the agar solution; dropwise add 0.05g of potassium persulfate and 0.02g of sodium bisulfite, place in a constant temperature water bath to react for 3.5 hours; dry and crush the product to obtain a composite water-absorbing material. The properties are shown in Table 2.

[0051] Table 2 Performance comparison of agar-sodium acrylate-acrylamide composite water-absorbing material and hydroxyethyl agar-sodium acrylate-acrylamide composite water-absorbing material.

[0052] Material Water absorption Saline absorption rate Artificial urine intake rate Staphylococcus aureus inhibition zone Escherichia coli inhibition zone Agar-sodium acrylate-acrylamide composite water-absorbing material 975g / g 141 g / g 43g / g 2.1cm No obvious inhibition zone was observed Hydroxyethyl agar-sodium acrylate-acrylamide 935g / g 167 g / g 79 g / g 3.2cm 1.5cm

[0053] Example 3 Preparation of diapers using hydroxyethyl agar-sodium acrylate-acrylamide material

[0054] The absorbent core structure of the applicant's diaper product is as follows: Figure 1As shown, it is composed of a sequentially stacked infiltration layer (skin-friendly), polymer layer 1, diversion layer, polymer layer 2 and diffusion layer. The hydroxyethyl agar-sodium acrylate-acrylamide material prepared in Example 2 is used as the polymer layer 2 of the diaper to exert its high urine absorption and antibacterial capabilities. The infiltration layer and diffusion layer materials can use known materials such as dust-free paper, hot air cloth, spunbond cloth, spunlace cloth, toilet paper, etc., and the polymer layer 1 can use commercially available acrylic resin materials with a high water absorption rate.

Claims

1. A composite core diaper with improved antibacterial and water absorption properties, the diaper comprising a highly absorbent antibacterial composite core, characterized in that: The highly water-absorbent antibacterial composite core is composed of a sequentially stacked infiltration layer, a polymer layer 1, a guide layer, a polymer layer 2, and a diffusion layer; the polymer layer 1 and / or the polymer layer 2 is made of a hydroxyethylated modified agar-sodium acrylate-acrylamide composite water-absorbent material added with chitosan quaternary ammonium salt; The hydroxyethylated modified agar-sodium acrylate-acrylamide composite water-absorbing material added with chitosan quaternary ammonium salt is prepared by the following method: Weigh 0.3g of hydroxyethylated modified agar, heat and dissolve it in 25mL of distilled water to obtain an agar solution; weigh 8g of sodium hydroxide and dissolve it in 50mL of distilled water to obtain a sodium hydroxide solution; slowly add 20g of acrylic acid to the sodium hydroxide solution in an ice bath to obtain a partially neutralized acrylic acid solution; add 7g of acrylamide, 0.2g of chitosan quaternary ammonium salt, and 0.005g of N,N'-methylenebisacrylamide to the partially neutralized acrylic acid solution, mix well, and then add the agar solution; dropwise add 0.03g of potassium persulfate and 0.02g of sodium bisulfite, and place in a constant temperature water bath at 35 degrees Celsius to react for 3 hours; dry and crush the product to obtain a composite water-absorbing material; Hydroxyethylated modified agar is prepared by the following method: Mix 10 grams of agar powder, 20 grams of anhydrous sodium sulfate and 60 mL of water in a reaction container; add 2 mL of 0.2 mol / L sodium borohydride and react for 20 minutes; add 20 mL of 5% w / v sodium hydroxide solution, flush nitrogen into the reaction container, add 8 mL of ethylene oxide, and react at 70 degrees Celsius for 10 minutes; add 200 mL of distilled water, adjust the pH to about 7.0 with glacial acetic acid, filter the solid, wash with distilled water, dry and crush to obtain hydroxyethyl agar.

2. The diaper according to claim 1, wherein the material of the infiltration layer can be selected from one or more of dust-free paper, hot air cloth, spunbond cloth, spunlace cloth, and toilet paper; the material of the guide layer is fluffy non-woven fabric; the material of the diffusion layer can be selected from one or more of dust-free paper, hot air cloth, spunbond cloth, spunlace cloth, and toilet paper.

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