Diaper composite absorbent core and its application

Abstract

The application provides a composite absorbent core suitable for diapers, the composite absorbent 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 composite water-absorbing material added with antibacterial substances. The composite absorbent core of the application has the characteristics of strong water and urine absorption capacity and fast speed.

Description

Field of the Invention

[0001] The present application belongs to the field of sanitary products and polymer materials. Specifically, the application provides a composite absorbent core of a diaper and its application. 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] In order to improve the absorption performance of super absorbent resin, the technical route of adding certain natural polysaccharides to it has been tried. However, these materials have many defects in absorption speed, antibacterial properties, etc. It is necessary to study the appropriate method of adding natural polysaccharides to give full play to their absorption-promoting effect and natural and safe characteristics. Summary of the invention

[0004] In order to improve the above-mentioned defects of the existing absorbent core, on the one hand, the present application provides a composite absorbent core containing natural polysaccharides, wherein the composite absorbent 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 a sodium acrylate composite water-absorbent material to which antibacterial substances are added.

[0005] Furthermore, the polymer layer 1 of the composite absorbent core is made of a sodium acrylate composite water-absorbing material added with antibacterial substances.

[0006] 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.

[0007] Furthermore, the antibacterial substance is chitosan quaternary ammonium salt and / or polyquaternary ammonium salt.

[0008] Furthermore, the sodium acrylate composite water-absorbing material added with antibacterial substances contains one or two components selected from agar, guar gum, and locust bean gum.

[0009] Furthermore, the natural polysaccharides are agar and guar gum in a mass ratio of 3:1.

[0010] Furthermore, the sodium acrylate composite water-absorbing material added with the antibacterial substance is prepared by polymerizing sodium acrylate, and agar, guar gum and the antibacterial substance are added during the polymerization process.

[0011] Furthermore, the sodium acrylate composite water-absorbing material added with antibacterial substances is prepared by the following method:

[0012] 0.3 g of agar and 0.1 g of guar gum are weighed and heated to dissolve in 25 mL of distilled water to obtain a polysaccharide solution; 6 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; 0.3 g of chitosan quaternary ammonium salt and 0.008 g of N,N'-methylenebisacrylamide are added to the partially neutralized acrylic acid solution, and the polysaccharide solution is added after mixing evenly; 0.02 g of potassium persulfate and 0.02 g of ethylenediamine are added dropwise, and the mixture is placed in a constant temperature water bath at 35 degrees Celsius for reaction for 4 hours; the product is dried and crushed to obtain a composite water-absorbing material.

[0013] On the other hand, the present application provides the use of the above-mentioned composite absorbent core in the preparation of personal hygiene products.

[0014] Furthermore, the personal hygiene product is a diaper.

[0015] 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.

[0016] 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 the technical solution of scaling up or down the reaction scale according to the gram ratio is also within the scope of protection of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The water absorption rate of agar-sodium acrylate-acrylamide composite water absorbent material and sodium acrylate-acrylamide composite water absorbent material is compared.

[0018] Figure 2 The water absorption rate of the improved agar-guar gum-sodium acrylate and agar-sodium acrylate-acrylamide is compared.

[0019] Figure 3 This paper compares the artificial urine absorption speed of the improved agar-guar gum-sodium acrylate and agar-sodium acrylate-acrylamide.

[0020] Figure 4 This is a structural diagram of the composite absorbent core of a diaper. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments are for demonstration purposes only, and the protection scope of the present invention is defined by the claims and is not limited to the following embodiments.

[0022] Test Method

[0023] Liquid absorption performance test

[0024] When testing the liquid aspiration speed:

[0025] 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.

[0026] When testing the total liquid absorption performance:

[0027] 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.

[0028] The liquids used in the absorbency test include:

[0029] Purified water: Wahaha brand;

[0030] Normal saline: 0.9% w / v sodium chloride in purified water;

[0031] 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.

[0032] Antibacterial performance test:

[0033] Design method based on the requirements of ISO 22196:

[0034] 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.

[0035] Main Materials

[0036] Agar powder: food grade, Shaanxi Chenming Biotechnology Co., Ltd.

[0037] Sodium acrylate, acrylamide: Jinan Yuanyang Chemical Co., Ltd.

[0038] Chitosan quaternary ammonium salt: Shaanxi Tangyao Biotechnology Co., Ltd.

[0039] Several natural high molecular weight polysaccharides: Guangzhou Hengtian Biotechnology Co., Ltd.

[0040] Other reagents were all conventional domestically produced.

[0041] Example 1 Preparation of natural polymer polysaccharide-sodium acrylate composite water-absorbing material

[0042] Agar-sodium acrylate-acrylamide composite water-absorbing material was prepared according to the method in the application on the same day:

[0043] 0.3 g of agar was weighed, heated and dissolved in 25 mL of distilled water to obtain an agar solution; 8 g of sodium hydroxide was weighed and dissolved in 50 mL of distilled water to obtain a sodium hydroxide solution; 20 g of acrylic acid was slowly added to the sodium hydroxide solution in an ice bath; 7 g of acrylamide, 0.2 g of chitosan quaternary ammonium salt, and 0.005 g of N,N'-methylenebisacrylamide were added, and the mixture was uniformly mixed and then added to the agar solution; 0.03 g of potassium persulfate and 0.02 g of sodium bisulfite were added dropwise, and the mixture was placed in a constant temperature water bath to react for 3 hours; the product was dried and crushed to obtain a composite water-absorbing material.

[0044] The material has good absorption capacity (water absorption performance reaches 975g / g, physiological saline absorption performance reaches 141g / g, and artificial urine absorption performance reaches 43 g / g), but compared with similar materials without agar (the amount of initiator and cross-linking agent is slightly adjusted), the absorption speed is obviously insufficient (see Figure 1 ).

[0045] To solve this problem, the applicant tried to use sodium polypropylene to replace sodium acrylate-acrylic acid, and to replace a combination of various natural polysaccharides. The preparation method is as follows:

[0046] Weigh an appropriate amount of polysaccharide, heat and dissolve it in or mix it in 25 mL of distilled water to obtain a polysaccharide solution; weigh 6 g of sodium hydroxide and dissolve it in 50 mL of distilled water to obtain a sodium hydroxide solution; slowly add 20 g of acrylic acid to the sodium hydroxide solution in an ice bath to obtain a partially neutralized acrylic acid solution; add 0.3 g of chitosan quaternary ammonium salt and 0.008 g of N,N'-methylenebisacrylamide to the partially neutralized acrylic acid solution, mix well and then add the polysaccharide solution; dropwise add 0.02 g of potassium persulfate and 0.02 g of ethylenediamine, and place in a constant temperature water bath at 35 degrees Celsius to react for 4 hours; dry and crush the product to obtain a composite water-absorbing material.

[0047] The basic performance of the product is shown in Table 1 below:

[0048] Table 1 Effects of products with different polysaccharides added

[0049] Material Water absorption Saline absorption rate Artificial urine intake rate Staphylococcus aureus inhibition zone Escherichia coli inhibition zone 5-minute water absorption Agar 0.2g Carrageenan 0.2g 958g / g 137 g / g 49g / g 3.0cm 1.3cm 98 g / g Agar 0.2g Xanthan gum 0.2g 937g / g 125 g / g 44 g / g 3.2 cm 1.2 cm 107 g / g Agar 0.2g Gelatin 0.2g 962g / g 140 g / g 47 g / g 2.7 cm Not Observable 125 g / g Agar 0.2g Locust bean gum 0.2g 990g / g 136 g / g 68 g / g 3.3 cm 1.6 cm 114 g / g Agar 0.2g Pectin 0.2g 877g / g 119 g / g 39 g / g 2.9 cm Not Observable 136 g / g Agar 0.2g Guar gum 0.2g 942g / g 130 g / g 66 g / g 3.1 cm 1.4 cm 151 g / g

[0050] Example 2 Improvement of polysaccharide ratio

[0051] Considering the absorption speed, urine absorption performance and cost, guar gum was selected for further study. Within the appropriate polysaccharide dosage range (preliminary experiments showed that it should not be greater than 0.4g), different proportions of guar gum were used for further screening. The results are shown in Table 2 below:

[0052] Table 2 Product effects of different agar-guar gum ratios

[0053] Material Water absorption Saline absorption rate Artificial urine intake rate Staphylococcus aureus inhibition zone Escherichia coli inhibition zone 5-minute water absorption Agar 0.05g Guar gum 0.35g 947g / g 132 g / g 57 g / g 2.9 cm 1.1 cm 128 g / g Agar 0.1g Guar gum 0.3g 929g / g 129 g / g 59 g / g 3.3 cm 1.3 cm 142 g / g Agar 0.35g Guar gum 0.05g 935g / g 135 g / g 64 g / g 3.2 cm 1.2 cm 160 g / g Agar 0.3g Guar gum 0.1g 939g / g 131 g / g 67 g / g 3.2 cm 1.3 cm 175 g / g Agar 0.2g Guar gum 0.2g 942g / g 130 g / g 66 g / g 3.1 cm 1.4 cm 151 g / g

[0054] The absorption rate (water and urine absorption) of the best technical solution of agar 0.3g + guar gum 0.1g was investigated and compared in detail. The results are as follows: Figure 2 , 3 As shown (agar-sodium acrylate-acrylamide is the formula shown in Example 1). Under the condition of similar total water absorption and urine absorption capacity, the short-term absorption performance within 10 minutes is examined. Agar 0.3g + guar gum 0.1g is significantly better, almost twice that of agar-sodium acrylate-acrylamide, which is particularly beneficial for products such as diapers that require absorption speed.

[0055] Example 3 Preparation of diapers using agar-guar gum-sodium acrylate material

[0056] The absorbent core structure of the applicant's diaper product is as follows: Figure 1 As shown, it is composed of a sequentially stacked infiltration layer (skin-friendly), polymer layer 1, diversion layer, polymer layer 2 and diffusion layer. The agar-guar gum-sodium acrylate material prepared in Example 3 is used as the polymer layer 1 of the diaper to exert its rapid 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 absorbent core for diapers, characterized in that: The composite absorbent core of the diaper 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 composite water-absorbing material added with antibacterial substances; The sodium acrylate composite water-absorbing material with antibacterial substances added thereto is prepared by polymerizing sodium acrylate, and agar and guar gum in a mass ratio of 3:1 and the antibacterial substances are added during the polymerization process; The antibacterial substance is chitosan quaternary ammonium salt; The sodium acrylate composite water-absorbing material added with antibacterial substances is prepared by the following method: 0.3 g of agar and 0.1 g of guar gum are weighed, heated and dissolved in 25 mL of distilled water to obtain a polysaccharide solution; 6 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; 0.3 g of chitosan quaternary ammonium salt and 0.008 g of N,N'-methylenebisacrylamide are added to the partially neutralized acrylic acid solution, and the polysaccharide solution is added after mixing evenly; 0.02 g of potassium persulfate and 0.02 g of ethylenediamine are added dropwise, and the mixture is placed in a constant temperature water bath at 35 degrees Celsius to react for 4 hours; the product is dried and crushed to obtain a sodium acrylate composite water-absorbing material with antibacterial substances added thereto.

2. The composite absorbent core of a 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.

3. Use of the composite absorbent core for diapers according to claim 1 or 2 in the preparation of diapers.

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