Antibacterial paper diaper core as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of disposable hygienic products, and particularly relates to an antibacterial paper diaper core and a preparation method and application thereof. According to the antibacterial paper diaper core body, antibacterial substances are loaded in a surface layer of the core body, or an antibacterial layer loaded with the antibacterial substances is additionally arranged in the surface layer of the core body; the antibacterial substance is a mixed aqueous extract of dandelion, sculellaria barbata and white willow bark. The specific structure of the antibacterial paper diaper core body comprises a surface layer, an absorption layer and a leakage-proof bottom layer which are sequentially formed in a composite mode. The surface layer comprises a hydrophobic non-woven fabric layer and an antibacterial layer which are compounded in sequence; the antibacterial layer is a hydrophilic non-woven fabric loaded with a mixed aqueous extract of dandelion, sculellaria barbata and white willow bark. The antibacterial paper diaper core has excellent antibacterial performance, has a good bacteriostatic effect on escherichia coli, staphylococcus aureus and candida albicans, can effectively inhibit breeding of bacteria in urine, protect the buttocks and fundamentally prevent the red buttocks problem, and is natural in component and high in safety.

Description

Technical Field

[0001] This invention belongs to the technical field of disposable hygiene products. More specifically, it relates to an antibacterial diaper core, its preparation method, and its application. Background Art

[0002] Disposable diapers are suitable for infants, young children, people with severe urinary incontinence, bedridden individuals, postpartum women, and other groups, especially infants, and are one of the most commonly used disposable hygiene products. China is not only the world's largest consumer of baby diapers but also the world's largest producer, and Chinese diapers hold an important position in the global market, with products exported to nearly 100 countries and regions worldwide. Technological innovation in diapers is crucial for industrial upgrading and competing in the high-end market. Performance, safety, comfort, and sustainability are all directions for technological innovation in diapers.

[0003] Diaper rash, commonly known as "red bottom," is the most common skin problem in infants and toddlers caused by using disposable diapers. When infants wear diapers, a relatively enclosed environment is created. Frequent urination and defecation in this environment lead to the accumulation of urine and feces, soaking the skin on the buttocks and causing diaper rash. Alternatively, the diaper may swell after absorbing water, reducing its breathability and creating a hot and humid environment, which can also lead to diaper rash. Furthermore, bacteria that thrive in the enclosed environment of a diaper can also cause diaper rash. Baby feces contain many bacteria, such as E. coli, Staphylococcus aureus, and Candida albicans. Many of these bacteria can produce urease, which breaks down urea in urine to produce ammonia. Ammonia is a well-known toxic and harmful substance that is irritating and corrosive to human skin, making it a significant culprit in causing diaper rash in babies. Babies' skin is already delicate, and it becomes even more sensitive and fragile after being contaminated by urine and feces. It is easily reddened and inflamed by the stimulation and corrosion of ammonia-like substances. At the same time, the natural protective film and stratum corneum of the baby's skin are also damaged, and it is easy to break down due to the friction of diapers. Pathogenic bacteria then have an opportunity to invade. Since babies have low immunity, they have difficulty resisting the invasion of bacteria, which can easily lead to a large area of ​​infection and redness on the buttocks, the common diaper rash.

[0004] To address diaper rash, the most common research and development focuses are on the material, breathability, absorbency, and dryness of the diaper surface after absorption. Currently, high-quality diaper brands are already doing very well. For example, Guangdong Yusheng Personal Care Products Co., Ltd. is an enterprise that researches, develops, produces, and sells mid-to-high-end baby and adult hygiene products. The market feedback is excellent, and it is also an OEM manufacturer for several high-end diaper brands.

[0005] Regarding antibacterial properties, current technologies generally involve adding antibacterial agents during the diaper manufacturing process to improve the diaper's antibacterial performance. Commonly used antibacterial agents in disposable hygiene products include chitosan, tea tree oil, or silver ion antibacterial agents. However, chitosan is poorly soluble in water, does not chemically react with body fluids, and its antibacterial effect is greatly affected by pH, limiting its effectiveness. Tea tree oil is a small molecule with low viscosity and is highly volatile, resulting in limited antibacterial effects. Silver ion antibacterial agents can damage mucous membranes of human organs during sterilization, and the accumulation of silver ions after absorption can lead to lesions, making them unsuitable for infant products. Plant-based antibacterial ingredients are the most commonly used in maternal and infant products due to their natural, gentle, and relatively safe properties, such as extracts from honeysuckle, mugwort, chamomile, and motherwort.

[0006] Therefore, developing plant-derived antibacterial ingredients to further address the diaper rash problem is our main research and development focus. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the prior art and provide an antibacterial diaper core loaded with antibacterial substances that can better solve the problem of diaper rash.

[0008] The purpose of this invention is to provide a method for preparing an antibacterial diaper core.

[0009] Another object of the present invention is to provide the use of the antibacterial diaper core in the preparation of antibacterial disposable absorbent products.

[0010] The above-mentioned objective of this invention is achieved through the following technical solution:

[0011] This invention provides an antibacterial diaper core, wherein an antibacterial substance is loaded in the surface layer of the core, or an antibacterial layer loaded with an antibacterial substance is added to the surface layer of the core; the antibacterial substance is a mixed water extract of dandelion, Scutellaria barbata and white willow bark;

[0012] The mixed water extract of dandelion, Scutellaria barbata and white willow bark is prepared by the following method: dandelion, Scutellaria barbata and white willow bark are mixed in a mass ratio of 1:1 to 3:1 to 3, pulverized to obtain a mixture, and the mixture is extracted with water and then processed to obtain the final product; the extraction temperature is 95 to 100℃.

[0013] The antibacterial diaper core prepared by this invention includes an antibacterial layer containing a mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark. Dandelion has the effects of clearing heat and detoxifying, and antibacterial and anti-inflammatory properties; Scutellaria barbata is also a good antibacterial substance, with good antibacterial effects against Escherichia coli, Staphylococcus aureus, and Candida albicans, effectively inhibiting the growth of bacteria in urine. Furthermore, Scutellaria barbata has high antibacterial activity over a wide pH range, effectively addressing the deficiency of decreased antibacterial ability due to changes in urine pH; white willow bark extract is a commonly used ingredient in cosmetics, with skin-moisturizing effects, and studies have also found it to have anti-inflammatory, antipyretic, analgesic, and antirheumatic effects. Experiments show that the combined use of these three substances has a synergistic effect, enabling the prepared antibacterial diaper core to exert a better antibacterial effect, exhibiting good inhibitory effects against Escherichia coli, Staphylococcus aureus, and Candida albicans, with an inhibition rate of over 97%, and its effect is significantly better than the effect of using each substance individually.

[0014] The inventors discovered through experiments that only the mixed aqueous extract obtained by mixing dandelion, Scutellaria barbata, and white willow bark in a specific mass ratio exhibited good antibacterial activity. Conversely, the mixed aqueous extract obtained by extracting dandelion, Scutellaria barbata, and white willow bark separately and then mixing them together showed significantly reduced antibacterial activity. Furthermore, the mixed aqueous extract prepared at an extraction temperature range of 95–100℃ exhibited good antibacterial activity; at excessively low extraction temperatures, the antibacterial activity decreased significantly.

[0015] Preferably, the extraction time is 30 to 50 minutes.

[0016] As a preferred embodiment, the present invention provides an antibacterial diaper core, comprising a top layer, an absorbent layer, and a leak-proof bottom layer formed in sequence; the top layer comprises a hydrophobic nonwoven fabric layer and an antibacterial layer formed in sequence; the antibacterial layer is a hydrophilic nonwoven fabric loaded with a mixed water extract of dandelion, Scutellaria barbata, and white willow bark.

[0017] The surface layer of this invention is sequentially composited with a hydrophobic nonwoven fabric layer and a hydrophilic antibacterial layer. Due to the difference in hydrophilicity and hydrophobicity on both sides, a one-way moisture-wicking effect is formed. When liquid comes into contact with the hydrophobic nonwoven fabric, it can quickly seep down due to the hydrophilic effect of the lower layer and is not easy to seep back, thus keeping the surface of the surface layer dry.

[0018] Preferably, the hydrophobic nonwoven fabric is polylactic acid (PLA) nonwoven fabric. PLA nonwoven fabric is a highly crystalline material. Due to the absence of polar groups on its surface, it exhibits hydrophobicity. It comes into direct contact with the skin and possesses excellent properties such as skin-friendliness, breathability, and dryness, making it one of the superior surface layer materials.

[0019] As a preferred option, a diversion layer can be set between the surface layer and the absorbent layer to accelerate the urine absorption rate.

[0020] Preferably, the absorbent layer comprises an upper absorbent core and a lower absorbent core that are sequentially laminated; wherein the upper absorbent core is a nonwoven fabric modified by crosslinking gel of quaternized chitosan and oxidized hydroxyethyl cellulose.

[0021] The absorbent layer of this invention has a double-layer structure. The upper absorbent core is a non-woven fabric modified with absorbent gel, which can quickly absorb seepage liquid and simultaneously transfer excess liquid to the lower absorbent core, compensating for the slower initial absorption of the lower absorbent core. This allows liquid to be quickly absorbed upon contact with the diaper, improving the diaper's absorbency. Furthermore, the absorbent gel of this invention has certain antibacterial properties, further enhancing the diaper's antibacterial activity.

[0022] The quaternized modified chitosan described in this invention can be synthesized using existing known conventional methods or purchased commercially available chitosan.

[0023] For reference, the present invention provides a method for preparing quaternized modified chitosan:

[0024] (1) Dissolve chitosan (CS) in glacial acetic acid solution to obtain CS solution;

[0025] (2) Weigh GTA according to the molar ratio of 2,3-epoxypropyltrimethylammonium chloride (GTA):CS structural unit of 2 to 4:1, and dissolve it in water to obtain GTA solution;

[0026] (3) Mix the CS solution and GTA solution, react at 50-60℃, and then perform post-treatment to obtain quaternized modified chitosan.

[0027] Furthermore, in step (3), the reaction time is 12 to 24 hours.

[0028] Further, in step (3), the post-processing is as follows: centrifugation, taking the supernatant and pouring it into acetone solution to obtain a precipitate, taking the precipitate and dissolving it in water, then dialyzing with running water for 3 to 6 days, and freeze-drying.

[0029] The oxidized hydroxyethyl cellulose described in this invention can be synthesized using existing known conventional methods or purchased commercially available.

[0030] For reference, the present invention provides a method for preparing oxidized hydroxyethyl cellulose: hydroxyethyl cellulose (HEC) and sodium periodate are mixed in water at a mass ratio of 1:0.2-0.5, reacted in the dark at 25-30°C, and then post-treated to obtain oxidized hydroxyethyl cellulose.

[0031] Furthermore, the light-protected reaction takes 12 to 24 hours.

[0032] Preferably, the post-treatment is as follows: add ethylene glycol, stir, remove unreacted sodium periodate, then centrifuge, take the supernatant and dialyze with running water for 3-6 days, and freeze-dry.

[0033] Furthermore, the lower absorbent core is a nonwoven fabric internally wrapped with fluff pulp and superabsorbent polymer.

[0034] Preferably, the upper absorbent core is prepared by immersing nonwoven fabric in a mixed aqueous solution containing quaternized modified chitosan and oxidized hydroxyethyl cellulose, and then freeze-drying it.

[0035] Preferably, in the preparation process of the upper absorbent core of the present invention, the mass concentration of quaternized modified chitosan in the mixed aqueous solution is 3-8%, and the mass concentration of oxidized hydroxyethyl cellulose is 3-5%.

[0036] Preferably, in the preparation process of the upper absorbent core of the present invention, the soaking time is 1 to 2 hours.

[0037] Meanwhile, the present invention also protects the method for preparing the antibacterial diaper core, including the following steps:

[0038] S1. Preparation of antibacterial layer: Soak hydrophilic nonwoven fabric in a mixed aqueous extract of dandelion, Scutellaria barbata and white willow bark, and dry to obtain antibacterial layer;

[0039] S2. Composite molding: The hydrophobic nonwoven fabric layer, antibacterial layer, absorbent layer and leak-proof bottom layer are bonded together in sequence with hot melt adhesive to obtain the final product.

[0040] Preferably, in step S1, the soaking time is 25 to 35 minutes.

[0041] This invention protects the use of the antibacterial diaper core in the preparation of antibacterial disposable absorbent products.

[0042] The present invention has the following beneficial effects:

[0043] This invention provides an antibacterial diaper core. The antibacterial diaper core comprises a top layer, an absorbent layer, and a leak-proof bottom layer, sequentially laminated together. The top layer contains an antibacterial substance, namely an aqueous extract of dandelion, Scutellaria barbata, and white willow bark. Experiments have shown that the combined use of these three substances has a synergistic effect, resulting in better antibacterial activity. It exhibits good inhibitory effects against Escherichia coli, Staphylococcus aureus, and Candida albicans, with inhibition rates exceeding 97%, and its effect is significantly better than that of using either substance individually. Simultaneously, the diaper core of this invention has a fast absorption rate and excellent backflow prevention capability. Detailed Implementation

[0044] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field.

[0045] Quaternized modified chitosan (QCS): 6 g of chitosan (CS) was weighed into 180 mL of glacial acetic acid (HAc, 0.5%, v / v) solution and mechanically stirred for 30 min to ensure complete dissolution of the chitosan in the HAc solution. Based on the molar ratio of 2,3-epoxypropyltrimethylammonium chloride (GTA):CS structural units = 3:1, 15.884 g of GTA was weighed and dissolved in 30 mL of deionized water. This GTA was added dropwise to the CS solution, and the mixture was reacted at 55 °C for 18 h. The resulting solution was then transferred to a centrifuge tube and centrifuged at 5000 rpm for 30 min. The supernatant was slowly poured into acetone solution to obtain a white precipitate. The obtained white precipitate was dissolved in water and dialyzed against running water for 3 days in an 8 kDa dialysis bag. The precipitate was then freeze-dried to obtain quaternized modified chitosan.

[0046] Preparation of oxidized hydroxyethyl cellulose (OHEC): 3g of hydroxyethyl cellulose (HEC) was added to 300mL of water and stirred to dissolve. Then, 0.9g of sodium periodate powder was added and reacted at 30℃ in the dark for 12h. After the reaction was completed, an appropriate amount of ethylene glycol was added and stirred to remove unreacted sodium periodate. The solution was then transferred to a centrifuge tube and centrifuged at 5000rpm for 30min. The supernatant was transferred to a dialysis bag with a molecular weight cutoff of 3500Da and dialyzed with running water for 3 days. After freeze-drying, oxidized hydroxyethyl cellulose was obtained.

[0047] Unless otherwise specified, the reagents and materials used in the following examples were commercially available.

[0048] Example 1: Preparation of an antibacterial diaper core

[0049] The antibacterial diaper core provided in this embodiment includes a hydrophobic polylactic acid nonwoven fabric layer, an antibacterial layer, an upper absorbent core, a lower absorbent core, and a leak-proof bottom layer, which are sequentially laminated.

[0050] The preparation method of antibacterial diaper core is as follows:

[0051] S1. Preparation of antibacterial layer: Soak hydrophilic nonwoven fabric in a mixed aqueous extract of dandelion, Scutellaria barbata and white willow bark for 30 min, and then vacuum dry to obtain antibacterial layer;

[0052] S2. Composite molding: The hydrophobic polylactic acid nonwoven fabric layer, antibacterial layer, upper absorbent core, lower absorbent core and leak-proof bottom layer are bonded together in sequence with hot melt adhesive to obtain the final product.

[0053] The mixed aqueous extract of dandelion, Scutellaria barbata and white willow bark was prepared by the following method: Dandelion, Scutellaria barbata and white willow bark were mixed and pulverized in a mass ratio of 1:2:1 to obtain a mixture; the mixture was decocted with water in a mass-volume ratio of 1g:10mL at 100℃ for 40min, filtered, and the mixed aqueous extract of dandelion, Scutellaria barbata and white willow bark was obtained.

[0054] The upper absorbent core is prepared by the following method: QCS and OHEC are dissolved in water to obtain a mixed aqueous solution, spunlace nonwoven fabric is soaked in the mixed aqueous solution, allowed to stand for 2 hours, and then freeze-dried to obtain the product; wherein, the mass concentration of QCS in the mixed aqueous solution is 5% and the mass concentration of OHEC is 3%.

[0055] In this embodiment, the lower absorbent core is a nonwoven fabric encapsulated with fluff pulp and superabsorbent polymer (SAP).

[0056] In this embodiment, the leak-proof bottom layer is a composite layer of PE composite bottom film and PP breathable microfilm.

[0057] Example 2: Preparation of an antibacterial diaper core

[0058] Compared with Example 1, the difference is that dandelion, Scutellaria barbata and white willow bark are mixed in a mass ratio of 1:2:2, while the rest of the experimental steps and parameters are the same as in Example 1.

[0059] Example 3: Preparation of an antibacterial diaper core

[0060] Compared with Example 1, the difference is that dandelion, Scutellaria barbata and white willow bark are mixed in a mass ratio of 1:1:2, and the extraction time of the mixed water extract of dandelion, Scutellaria barbata and white willow bark is 50 minutes. The remaining experimental steps and parameters are the same as in Example 1.

[0061] Example 4: Preparation of an antibacterial diaper core

[0062] Compared with Example 1, the difference is that the extraction temperature of the mixed water extract of dandelion, Scutellaria barbata and white willow bark is 95℃, while the remaining experimental steps and parameters are the same as in Example 1.

[0063] Comparative Example 1

[0064] Compared with Example 1, the difference is that the mixture is dandelion and Scutellaria barbata mixed in a mass ratio of 1:2, while the rest of the experimental steps and parameters are the same as in Example 1.

[0065] Comparative Example 2

[0066] Compared with Example 1, the difference is that the mixture is a mixture of Scutellaria barbata and white willow bark in a mass ratio of 2:1, while the rest of the experimental steps and parameters are the same as in Example 1.

[0067] Comparative Example 3

[0068] Compared with Example 1, the difference is that the mixture is white willow bark and dandelion mixed in a mass ratio of 1:1, while the rest of the experimental steps and parameters are the same as in Example 1.

[0069] Comparative Example 4

[0070] Compared with Example 1, the difference lies in the preparation method of the mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark; the remaining experimental steps and parameters are the same as in Example 1. In this comparative example, dandelion, Scutellaria barbata, or white willow bark are first extracted with water individually, and then the three aqueous extracts are mixed to obtain the mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark. The specific extraction method is as follows:

[0071] Weigh out the corresponding weights of dandelion, scutellaria barbata, and white willow bark according to the mass ratio of 1:2:1.

[0072] Preparation of dandelion water extract: Take dandelion powder, decoct it with water at 100℃ for 40 minutes at a mass-volume ratio of 1g:10mL, filter it, and obtain dandelion water extract;

[0073] Preparation of Scutellaria barbata water extract: Scutellaria barbata was crushed and boiled with water at 100℃ for 40 minutes at a mass-volume ratio of 1g:10mL. After filtration, Scutellaria barbata water extract was obtained.

[0074] Preparation of water extract of white willow bark: Take white willow bark, crush it, and boil it with water at 100℃ for 40 minutes at a mass-volume ratio of 1g:10mL. Filter to obtain water extract of white willow bark.

[0075] The aqueous extracts of dandelion, Scutellaria barbata, and white willow bark are mixed to obtain a mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark. The mass concentrations of dandelion, Scutellaria barbata, and white willow bark in the mixed aqueous extract are the same as in Example 1.

[0076] Taking dandelion as an example, the mass concentration (g / mL) = the mass of dandelion added (g) / the volume of the mixed water extract (mL).

[0077] Comparative Example 5

[0078] Compared with Example 1, the difference is that the extraction temperature of the mixed water extract of dandelion, Scutellaria barbata and white willow bark is 75℃, while the remaining experimental steps and parameters are the same as in Example 1.

[0079] Comparative Example 6

[0080] Compared with Example 1, the difference is that the upper absorbent core is a spunlace nonwoven fabric that has not been gel-modified, while the other experimental steps and parameters are the same as in Example 1.

[0081] Comparative Example 7

[0082] Compared with Example 1, the difference is that the hydrophilic nonwoven fabric of the antibacterial layer is not soaked in the mixed water extract of dandelion, Scutellaria barbata and white willow bark, while the rest of the experimental steps and parameters are the same as in Example 1.

[0083] Comparative Example 8

[0084] Compared with Example 1, the difference is that the hydrophilic nonwoven fabric of the antibacterial layer is not soaked in the mixed water extract of dandelion, Scutellaria barbata and white willow bark, and the upper absorbent core is spunlace nonwoven fabric without gel modification. The remaining experimental steps and parameters are the same as in Example 1.

[0085] Example of effect 1

[0086] Antibacterial test

[0087] Experimental Methods: The diaper cores prepared in Examples 1-4 and Comparative Examples 1-8 were cut into 20*30mm square pieces. A 20*30mm square piece of diaper core prepared in Comparative Example 8, made of the same material and without antibacterial components, was used as a control sample. The test samples were 20*30mm square pieces of diaper cores prepared in Examples 1-4 and Comparative Examples 1-7. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans were tested according to section E6.3 of GB15979-2024 "Hygienic Requirements for Disposable Sanitary Products". The antibacterial rate was calculated using the following formula:

[0088]

[0089] In the formula N C N represents the average colony count of the control sample, expressed in colony forming units per tablet (CFU / tablet); S The average number of colonies in the test sample is expressed in units of colony forming units (CFU / piece); Y represents the inhibition rate.

[0090] Table 1 Antibacterial effects of each group

[0091]

[0092] As shown in Table 1, the antibacterial diaper core prepared in the embodiments of the present invention has a good inhibitory effect on Escherichia coli, Staphylococcus aureus, and Candida albicans, with an inhibition rate of over 97%. The present invention uses a mixed extract of dandelion, Scutellaria barbata, and white willow bark as the antibacterial layer, utilizing the synergistic effect of the three to achieve a better antibacterial effect.

[0093] Compared with Comparative Example 7, Examples 1-4 used a mixed extract of dandelion, Scutellaria barbata and white willow bark as an antibacterial layer, which significantly improved the antibacterial rate. Specifically, the inhibition rate against Escherichia coli was increased by at least 114.88%, the inhibition rate against Staphylococcus aureus was increased by at least 124.67%, and the inhibition rate against Candida albicans was increased by at least 131.69%.

[0094] Comparative Examples 1 (inhibition layer consisting only of extracts from dandelion and Scutellaria barbata), 2 (inhibition layer consisting only of extracts from Scutellaria barbata and white willow bark), and 3 (inhibition layer consisting only of extracts from white willow bark and dandelion) all showed significantly reduced inhibition rates against common urinary Escherichia coli, Staphylococcus aureus, and Candida albicans. Compared to Example 1, the inhibition rates against Escherichia coli in Comparative Examples 1, 2, and 3 decreased by 29.27%, 27.46%, and 19.27%, respectively; the inhibition rates against Staphylococcus aureus in Comparative Examples 1, 2, and 3 decreased by 30.57%, 24.67%, and 23.71%, respectively; and the inhibition rates against Candida albicans in Comparative Examples 1, 2, and 3 decreased by 30.44%, 32.13%, and 28.17%, respectively. This demonstrates that the three components in the mixed extract of dandelion, Scutellaria barbata, and white willow bark exert a synergistic antibacterial effect.

[0095] In Comparative Example 4, the preparation method of the mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark was changed. First, dandelion, Scutellaria barbata, or white willow bark were extracted separately, and then the three extracts were mixed to obtain the mixed aqueous extract of dandelion, Scutellaria barbata, and white willow bark. Its antibacterial rates against common bacteria in urine, such as Escherichia coli, Staphylococcus aureus, and Candida albicans, were 59.31%, 58.19%, and 58.27%, respectively, all significantly lower than those in Example 1. This indicates that only the mixed aqueous extract prepared by mixing dandelion, Scutellaria barbata, and white willow bark and then extracting them exhibits good antibacterial properties when used to prepare antibacterial diaper cores.

[0096] In Comparative Example 5, the extraction temperature during the preparation of the mixed water extract of dandelion, Scutellaria barbata and white willow bark was reduced. The antibacterial properties of the final diaper core were also significantly lower than those in Example 1, indicating that only when extracted within the temperature range described in this invention can the prepared diaper core have good antibacterial properties.

[0097] In Comparative Example 6, the upper absorbent core was not modified with gel that has antibacterial properties, and the antibacterial rate of the prepared diaper decreased to some extent compared with that of Example 1.

[0098] Example 2

[0099] Experimental method: Liquid was added to the metal ring using a funnel. Two 80 mL portions of 0.9% saline were added at 0 min and 8 min respectively. The timing started at the beginning of the liquid addition and continued until the liquid surface in the absorption zone disappeared. The absorption time was recorded as the absorption rate, measured in seconds. Five minutes after adding the liquid, 3.5 kg of absorbent paper of known mass was applied for 3 min. The absorbent paper was then removed and weighed. The amount of reabsorption was calculated based on the weight difference of the absorbent paper before and after the reabsorption, measured in grams.

[0100] Experimental results:

[0101] Table 2 Absorbency performance of diaper cores in Examples 1-4 and Comparative Examples 1-8

[0102] Group First absorption rate / s Second absorption rate / s Reabsorption rate / g Example 1 14 12 1.0 Example 2 12 9 0.8 Example 3 13 10 0.9 Example 4 11 10 0.8 Comparative Example 1 14 11 1.1 Comparative Example 2 15 10 1.2 Comparative Example 3 13 9 0.9 Comparative Example 4 14 13 1.1 Comparative Example 5 15 13 1.1 Comparative Example 6 20 22 8.9 Comparative Example 7 13 11 1.0 Comparative Example 8 22 24 9.5

[0103] The experimental results are shown in Table 2. The table shows that the diaper cores of Examples 1-4 of this invention all exhibit fast absorption speeds and low rewetting. This is mainly because the surface layer of this invention combines hydrophobic and hydrophilic nonwoven fabrics. Due to the difference in hydrophobicity and hydrophilicity at both ends, a one-way moisture-wicking effect is achieved, increasing the absorption speed and reducing rewetting. Simultaneously, the absorbent layer uses a double-layer absorbent core, where the upper absorbent core is a nonwoven fabric modified with absorbent gel, further enhancing the liquid absorption speed. Comparative Examples 1-5 and Comparative Example 7 mainly involve changes to the antibacterial layer and do not involve the one-way moisture-wicking surface layer or the absorbent layer; therefore, they also exhibit good absorption speeds and anti-rewetting capabilities.

[0104] In Comparative Examples 6 and 8, the upper absorbent core was not modified with gel, which led to a sharp decrease in its absorption rate and absorption capacity, making it more prone to reabsorption under the same conditions.

[0105] Example 3

[0106] The diaper cores from Examples 1-4 and Comparative Examples 1-8 were used to manufacture diapers, which were produced by Guangdong Yusheng Personal Care Products Co., Ltd., in size L. All the diapers produced met all the requirements of Part 1 of GB / T28004.1-2021, "Infant Diapers".

[0107] Sixty infants prone to diaper rash (most commercially available brands of diapers cause diaper rash) were recruited and randomly divided into 12 groups of 5 infants each for a one-month trial. Before the trial, all caregivers received standardized training: change diapers every 3 hours during the day (7:00 AM to 10:00 PM) and twice at night; change diapers immediately after bowel movements; and clean the diaper area thoroughly before changing diapers. When diaper rash occurred, it was recorded, and the diaper was discontinued immediately, followed by treatment with 0.1% hydrocortisone butyrate cream.

[0108] The results are shown in Table 3 below:

[0109] Table 3: Feedback from infants and toddlers on diaper testing over one month.

[0110]

[0111]

[0112] As shown in Table 3, the diapers prepared using Examples 1-4 of this invention have good breathability, and fewer cases of diaper rash occur in infants after wearing them. This is likely because the diapers can quickly absorb urine during wear, keeping the surface layer dry and ensuring the infant's buttocks remain in a dry environment. Furthermore, the antibacterial layer on the surface layer exerts its antibacterial effect, greatly reducing the incidence of diaper rash. Comparative Examples 4, 5, and 7 show a significantly reduced antibacterial effect, and infants may experience diaper rash due to bacterial growth during wear; therefore, their incidence of diaper rash is slightly higher than that of Examples 1-4. The diaper prepared using Comparative Example 6 shows decreased absorbency and anti-leakage performance. During wear, infants may experience diaper rash due to delayed absorption, resulting in a warm and humid environment on the buttocks. The diapers prepared in Comparative Example 8 do not contain any antibacterial ingredients, and the upper absorbent core is not modified with gel. The antibacterial performance, moisture absorption performance and anti-backflow performance are all reduced. When infants wear them, the buttocks may be in a warm and humid environment due to untimely absorption, which makes it easier for bacteria to grow, thus increasing the probability of diaper rash.

[0113] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An antibacterial diaper core, characterized in that: The surface layer of the core body is loaded with antibacterial substances, or an antibacterial layer loaded with antibacterial substances is added to the surface layer of the core body; the antibacterial substances are mixed water extracts of dandelion, Scutellaria barbata and white willow bark; The mixed water extract of dandelion, Scutellaria barbata and white willow bark is prepared according to the following method: dandelion, Scutellaria barbata and white willow bark are mixed in a mass ratio of 1:1 to 3:1 to 3, crushed to obtain a mixture, the mixture is extracted with water, and post-treated to obtain the mixture; the extraction temperature is 95 to 100°C.

2. The antibacterial diaper core according to claim 1, characterized in that: The mass volume ratio of the mixture to water is 1 g:5-10 mL.

3. The antibacterial diaper core according to claim 1, characterized in that: The extraction time is 30 to 50 minutes.

4. The antibacterial diaper core according to any one of claims 1 to 3, characterized in that: It includes a surface layer, an absorption layer, and a leakproof bottom layer which are compositely formed in sequence; The surface layer comprises a hydrophobic nonwoven fabric layer and an antibacterial layer which are compounded in sequence; The antibacterial layer is a hydrophilic non-woven fabric loaded with a mixed water extract of dandelion, Scutellaria barbata and white willow bark.

5. The antibacterial diaper core according to claim 4, characterized in that: The absorption layer comprises an upper absorption core and a lower absorption core which are compounded in sequence; wherein the upper absorption core is a non-woven fabric modified by cross-linking gel of quaternized chitosan and oxidized hydroxyethyl cellulose.

6. The antibacterial diaper core according to claim 5, characterized in that: The upper absorbent core is prepared according to the following method: a non-woven fabric is soaked in a mixed aqueous solution containing quaternary ammonium modified chitosan and oxidized hydroxyethyl cellulose, and freeze-dried to obtain the upper absorbent core.

7. The antibacterial diaper core according to claim 5, characterized in that: The lower absorbent core is a non-woven fabric with fluff pulp and high molecular water-absorbing resin wrapped inside.

8. The method for preparing the antibacterial diaper core according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Preparation of the antibacterial layer: soaking a hydrophilic nonwoven fabric in a mixed aqueous extract of dandelion, Scutellaria barbata and white willow bark, and drying to obtain an antibacterial layer; S2. Composite molding: The hydrophobic non-woven fabric layer, the antibacterial layer, the absorbent layer and the leakproof bottom layer are sequentially bonded by hot melt adhesive to obtain a composite material.

9. The preparation method according to claim 8, characterized in that: In step S1, the soaking time is 25 to 35 minutes.

10. Use of the antibacterial diaper core according to any one of claims 1 to 7 in the preparation of antibacterial disposable absorbent products.

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