Bacteriostatic mixed solution and paper diaper core body prepared from same

Abstract

The invention belongs to the technical field of disposable hygienic products, and particularly relates to an antibacterial mixed solution and a paper diaper core prepared from the antibacterial mixed solution. The bacteriostatic mixed solution is a mixed aqueous extract of purslane, rosemary and Japanese banana flower; a preparation method of the mixed aqueous extract comprises the following steps: mixing purslane, rosemary, Japanese banana flower and water, and extracting at 75-85 DEG C; the mass ratio of the purslane to the rosemary to the Japanese banana flower is 1: (2-6): (2-4). The paper diaper core body prepared from the obtained bacteriostatic mixed solution has good antibacterial performance and has a good bacteriostatic effect on escherichia coli, staphylococcus aureus and candida albicans which are common in urine, the bacteriostatic rate is 98% or above, and the effect is obviously better than the effect of pairwise cooperative use. Meanwhile, due to the fact that the bacteriostatic mixed solution has special fragrance, the prepared paper diaper core body further has a good peculiar smell removing effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of disposable sanitary products, and more specifically, relates to an antibacterial mixed liquid and a diaper core prepared therefrom. Background Art

[0002] Plant extracts are a type of substance that is naturally derived, has few side effects, and is relatively mild and non-irritating. The active ingredients in them are closer to nature and gentler on the skin. Compared with synthetic chemicals, the ingredients in plant ingredients are more easily absorbed by the skin and are non-irritating to the skin. They are especially suitable for the delicate skin of infants and young children. Therefore, more and more studies are applying them in infant and young children's daily chemical products. However, the efficacy of extracts from a single plant is relatively limited, and some extracts from a single plant may be sensitive to environmental conditions (such as light, temperature, pH, etc.), resulting in poor stability when they are used in products, and they cannot play their role well.

[0003] Plant compound extracts are made by compounding different varieties of plants and then extracting them. However, there is uncertainty in the effects produced after compounding and extraction. The functions of different plants may conflict with each other, resulting in adverse reactions. It is also possible that after compounding, there is no significant change in the efficacy. It is also possible that after compounding, multiple active ingredients from different plants are integrated to have multiple activities, achieving a multi-effect care effect. At the same time, various components in different plants may play a synergistic role and enhance each other's efficacy, making their effects more significant than those of a single extract.

[0004] Chinese patent application CN118304225A discloses a composite plant essential oil obtained from a mixture of perilla, Acanthopanax senticosus seeds, Citron, Herba Amaranthus, Chamomile, Blumea Balsamifera and grapefruit peel as raw materials, which is subjected to pretreatment, extraction treatment and extraction treatment. After compounding, the composite plant essential oil has obvious inhibitory effect on Propionibacterium acnes, and can also achieve functional diversification through multiple aspects and multiple targets, so that it has antioxidant, skin repair promoting and significant acne removal effects.

[0005] Chinese patent application CN118121664A discloses an antibacterial and anti-mite composition, its preparation method and eye patch, which limits the ratio between Artemisia annua, Murraya osmanthus, Vetiver, Golden pine, Moringa oleifera leaves and Herba Lycopodii to a reasonable range, so that the components can exert a better synergistic effect, making the antibacterial and anti-mite composition have better antibacterial and anti-mite function.

[0006] In summary, compounding specific raw materials in a certain proportion can effectively increase the efficacy and activity. This plant compound extract with good efficacy and high safety is a good additive in the production process of infant products, which is very beneficial to improving the efficacy of the product and increasing the product's market value and market competitiveness.

[0007] As an indispensable sanitary product in modern life, diapers are widely used, from infants to adults who need special care. In the infant stage, diapers have become an indispensable part of daily care, and their importance is self-evident. However, with the continuous upgrading of market demand and the increasing diversification of consumer demand, the diaper industry is also facing severe challenges and opportunities. Technological innovation has become the key to industrial upgrading and competing for the high-end market. In terms of technological innovation, performance, safety, comfort and sustainability have become the main development directions.

[0008] Existing technologies mainly carry out technical innovation and optimization of diapers from the following aspects: optimizing the material of diapers, researching fiber materials with high water absorption, high air permeability and quick drying performance, such as nanofibers, biodegradable fibers, etc., to improve the overall performance of diapers; improving the structural design of diapers, adjusting the size, shape, fit, and increasing air holes and ventilation channels to enhance comfort, freedom of movement and air permeability inside diapers, and reduce the creation of hot and humid environments; researching materials with high water absorption performance, such as polymer absorbent resins, modified starch, etc., to improve the water absorption capacity of diapers and reduce the penetration of urine and feces into the skin; by adding materials with good drying performance, such as graphene, etc., to improve the dryness of the diaper surface after water absorption and reduce the risk of diaper rash; in addition to the basic moisture absorption function, adding plant extracts with multiple functions such as antibacterial, anti-inflammatory, and antioxidant, such as honeysuckle, wormwood, chamomile, motherwort, etc., to improve the safety and user experience of the product.

[0009] Therefore, developing new plant compound extracts and applying them to diaper production processes to improve product competitiveness and meet market demand are the main directions of our subsequent research and development. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the defects and shortcomings of the prior art and provide an antibacterial mixed solution.

[0011] The object of the present invention is to provide a diaper core.

[0012] Another object of the present invention is to provide a method for preparing the diaper core.

[0013] Another object of the present invention is to provide the use of the antibacterial diaper core in the preparation of antibacterial disposable absorbent products.

[0014] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0015] The invention provides an antibacterial mixed liquid, which is a mixed water extract of purslane, rosemary and banana flower. The preparation method of the mixed water extract is: mixing purslane, rosemary, banana flower and water, and extracting at 75-85°C; wherein the mass ratio of purslane, rosemary and banana flower is 1:2-6:2-4.

[0016] Purslane is the dried aerial part of the plant Portulaca oleracea L. of the Portulacaceae family. It has the effects of clearing away heat and detoxifying, cooling blood and stopping bleeding, and is commonly used to treat heat-toxic bloody dysentery, carbuncle, furuncle, eczema, erysipelas, snake and insect bites, blood in stool, hemorrhoids and metrorrhagia. Purslane is a plant that can be used as both medicine and food. It is also a plant that can be processed into a raw material for cosmetics. Its water extract contains a variety of natural active ingredients such as flavonoids, alkaloids, polysaccharides, etc. It is a common natural plant raw material in infant cosmetics, with moisturizing, antioxidant, anti-allergic, and antibacterial effects.

[0017] Rosemary is a perennial shrub of the Lamiaceae family, native to the Mediterranean coast, and mainly distributed in Europe, North Africa, and West Asia. The main active ingredients contained in rosemary water extract are rosmarinic acid, chlorogenic acid, caffeic acid, ferulic acid, L-ascorbic acid, hesperidin, isohesperidin, etc., which have antioxidant, anti-tumor, antibacterial, anti-inflammatory, and liver protection effects. At the same time, it has a special aroma and can reduce odor. Due to these efficacy characteristics, rosemary water extract has a wide range of applications in the fields of food and cosmetics.

[0018] Banana flower is the bud or flower of the banana plant (Musa basjoo Sieb.et Zucc) of the Musaceae family, and is an important byproduct of the banana production process. Modern research shows that banana flower tastes sweet, slightly spicy, and cool in nature. It has the effects of resolving phlegm and softening hard masses, calming the liver, harmonizing blood stasis, and promoting menstruation. It contains active substances such as protein, amino acids, sugars, organic acids, and saponins.

[0019] The invention obtains an antibacterial mixed solution by appropriately mixing scutellaria baicalensis, rosemary and banana flower, and extracting them with water. The obtained antibacterial mixed solution has excellent antibacterial effect, and its effect is significantly better than that of using two of the ingredients. At the same time, because the preparation raw materials contain rosemary, the prepared antibacterial mixed solution has a special aroma.

[0020] Preferably, the mass volume ratio of the mixture of purslane, rosemary and banana flowers to water is 1:4-10 g / mL.

[0021] Preferably, the extraction time is 1.5 to 3 hours.

[0022] Preferably, the mass ratio of purslane, rosemary and banana flower is 1:2-4:2-4.

[0023] A diaper core body, comprising a surface layer, an absorbent layer, and a leakproof bottom layer which are compositely formed in sequence;

[0024] The surface layer comprises a hydrophobic nonwoven fabric layer and an antibacterial layer which are compounded in sequence;

[0025] The antibacterial layer is a hydrophilic nonwoven fabric containing the antibacterial mixed solution of the present invention.

[0026] The diaper core prepared by the present invention comprises an antibacterial layer containing a mixed water extract of purslane, rosemary and banana flower. The present invention has found through experiments that the three substances are used in combination to have a synergistic effect, so that the prepared diaper core can play a better antibacterial and anti-inflammatory effect, and has a good inhibitory effect on Escherichia coli, Staphylococcus aureus and Candida albicans, with an antibacterial rate of more than 98%, and the effect is significantly better than the effect of using the three substances in combination.

[0027] At the same time, the antibacterial mixed liquid of the present invention has a special aroma, and the prepared diaper core also has a good deodorizing effect.

[0028] The surface layer of the present invention is compounded with a hydrophobic non-woven fabric layer and a hydrophilic antibacterial layer in sequence. Due to the difference in hydrophilicity and hydrophobicity on both sides, a unidirectional moisture conduction is formed. When liquid contacts the hydrophobic non-woven fabric, it can quickly infiltrate due to the hydrophilic effect of the lower layer and is not easy to reversely infiltrate, thereby maintaining the dryness of the surface of the surface layer.

[0029] Preferably, the hydrophobic nonwoven fabric is a polylactic acid nonwoven fabric. The polylactic acid nonwoven fabric is a highly crystalline material, and because it has no polar groups on its surface, it exhibits hydrophobicity; it is in direct contact with the skin and has excellent properties such as skin-friendly, breathable, and dry.

[0030] Preferably, a guide layer can be provided between the surface layer and the absorption layer to accelerate the absorption rate of urine.

[0031] Preferably, the antibacterial layer is prepared by soaking the hydrophilic non-woven fabric in the antibacterial mixed solution of the present invention.

[0032] More preferably, the soaking time is 25 to 35 minutes.

[0033] Preferably, the absorbent layer comprises an upper absorbent core and a lower absorbent core which are compounded in sequence; wherein the upper absorbent core is a non-woven fabric modified by cross-linking gel of quaternized chitosan and oxidized hydroxyethyl cellulose.

[0034] The absorbent layer of the present invention is a double-layer structure. The upper absorbent core is a non-woven fabric modified with a water-absorbent gel, which can quickly absorb the seeping liquid and transfer the excess liquid to the lower absorbent core, thereby making up for the defect of the lower absorbent core absorbing slowly in the early stage, so that the liquid can be quickly absorbed when it contacts the diaper, thereby improving the liquid absorption capacity of the diaper. At the same time, the water-absorbent gel of the present invention has certain antibacterial properties, which can further improve the antibacterial activity of the diaper.

[0035] The quaternary ammonium modified chitosan of the present invention can be synthesized by conventional methods known in the art or purchased commercially.

[0036] For reference, the present invention provides a method for preparing quaternary ammonium modified chitosan:

[0037] (1) dissolving chitosan (CS) in glacial acetic acid solution to obtain a CS solution;

[0038] (2) weighing 2,3-epoxypropyltrimethylammonium chloride (GTA) according to the molar ratio of 2,3-epoxypropyltrimethylammonium chloride (GTA) to CS structural unit of 2 to 4:1, and dissolving GTA in water to obtain a GTA solution;

[0039] (3) The CS solution and the GTA solution are mixed, reacted at 50-60° C., and post-treated to obtain quaternary ammonium modified chitosan.

[0040] Furthermore, in step (3), the reaction time is 12 to 24 hours.

[0041] Furthermore, in step (3), the post-treatment is: centrifugation, pouring the supernatant into an acetone solution to obtain a precipitate, dissolving the precipitate in water, then dialyzing with running water for 3 to 6 days, and freeze-drying.

[0042] The oxidized hydroxyethyl cellulose of the present invention can be synthesized by conventional methods known in the art or purchased commercially.

[0043] 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 at 25-30° C. in the dark, and post-treated to obtain oxidized hydroxyethyl cellulose.

[0044] Furthermore, the light-proof reaction time is 12 to 24 hours.

[0045] Preferably, the post-treatment is: adding ethylene glycol, stirring, removing unreacted sodium periodate, then centrifuging, taking the supernatant and dialyzing it with running water for 3 to 6 days, and freeze-drying.

[0046] Furthermore, the lower absorbent core is a non-woven fabric with fluff pulp and high molecular water-absorbing resin wrapped inside.

[0047] Preferably, the upper absorbent core is prepared by the following method: soaking a non-woven fabric in a mixed aqueous solution containing quaternary ammonium modified chitosan and oxidized hydroxyethyl cellulose, and freeze-drying the mixture.

[0048] Preferably, in the process of preparing the upper absorbent core of the present invention, the mass concentration of the quaternary ammonium modified chitosan in the mixed aqueous solution is 3-8%, and the mass concentration of the oxidized hydroxyethyl cellulose is 3-5%.

[0049] Preferably, in the process of preparing the upper absorbent core of the present invention, the soaking time is 1 to 2 hours.

[0050] At the same time, the present invention also protects the preparation method of the antibacterial diaper core, which is obtained by sequentially bonding the hydrophobic non-woven fabric layer, the antibacterial layer, the absorbent layer and the leakproof bottom layer by hot melt adhesive.

[0051] The present invention protects the use of the diaper core in the preparation of antibacterial disposable absorbent products.

[0052] The present invention has the following beneficial effects:

[0053] The present invention provides an antibacterial mixed liquid, which is obtained by extracting three raw materials, namely, purslane, rosemary and banana flower, in an appropriate ratio through water, and the antibacterial mixed liquid has a good antibacterial effect. The antibacterial mixed liquid of the present invention is applied to prepare the core of diapers. It is found that the three substances are used in combination to have a synergistic effect, and can exert a better antibacterial and anti-inflammatory effect. They have a good inhibitory effect on Escherichia coli, Staphylococcus aureus and Candida albicans, with an inhibition rate of more than 98%, and the effect is significantly better than the effect of using them in combination. At the same time, the diaper core prepared by the present invention has a faster absorption speed and excellent anti-reseepage ability. The antibacterial mixed liquid of the present invention has a special fragrance, and can effectively reduce the odor of diapers during the wearing process of diapers. DETAILED DESCRIPTION

[0054] The present invention is further described below with reference to specific examples, but the examples do not limit the present invention in any form. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0055] Quaternary ammonium modified chitosan (QCS): Weigh 6g chitosan (CS) in 180mL glacial acetic acid (HAc, 0.5%, v / v) solution, mechanically stir for 30min to fully dissolve chitosan in the HAc solution. According to the 2,3-epoxypropyltrimethylammonium chloride (GTA): CS structural unit = 3:1 (molar ratio), weigh 15.884g GTA, dissolve in 30mL deionized water, add dropwise to the CS solution, react at 55℃ for 18h, transfer the mixed solution to a centrifuge tube, centrifuge at 5000rpm for 30min, take the supernatant and slowly pour it into the acetone solution to obtain a white precipitate. The obtained white precipitate is dissolved in water, dialyzed in running water for 3 days in an 8kDa dialysis bag, and freeze-dried to obtain quaternary ammonium modified chitosan.

[0056] Preparation of oxidized hydroxyethyl cellulose (OHEC): 3 g of hydroxyethyl cellulose (HEC) was added to 300 mL of water and stirred to dissolve, then 0.9 g of sodium periodate powder was added, and the mixture was reacted at 30°C in the dark for 12 h. After the reaction, an appropriate amount of ethylene glycol was added and stirred to remove the unreacted sodium periodate. The solution was then transferred to a centrifuge tube and centrifuged at 5000 rpm for 30 min. The supernatant was transferred to a dialysis bag with a molecular weight cutoff of 3500 Da, dialyzed in running water for 3 days, and freeze-dried to obtain oxidized hydroxyethyl cellulose.

[0057] Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0058] Example 1 Preparation of a Diaper Core

[0059] The diaper core provided in this embodiment includes a hydrophobic polylactic acid non-woven fabric layer, an antibacterial layer, an upper absorbent core, a lower absorbent core, and a leakproof bottom layer that are composite-formed in sequence. The preparation method of the diaper core is as follows:

[0060] S1. Preparation of antibacterial layer: soak the hydrophilic nonwoven fabric in the antibacterial mixture for 30 min and vacuum dry to obtain the antibacterial layer;

[0061] S2. Composite molding: The hydrophobic polylactic acid non-woven fabric layer, the antibacterial layer, the upper absorbent core, the lower absorbent core and the leakproof bottom layer are sequentially bonded by hot melt adhesive to obtain the composite molding.

[0062] The preparation method of the antibacterial mixed liquid is as follows: purslane, rosemary and banana flower are mixed and crushed in a mass ratio of 1:3:3 to obtain a mixture; the mixture and water are extracted at a mass volume ratio of 1g:8mL at 80°C for 1.5h, and filtered to obtain the antibacterial mixed liquid.

[0063] The upper absorbent core is prepared according to the following method: QCS and OHEC are dissolved in water to obtain a mixed aqueous solution, a spunlace nonwoven fabric is immersed in the mixed aqueous solution, allowed to react for 2 hours, and then freeze-dried to obtain the upper absorbent core; wherein the mass concentration of QCS in the mixed aqueous solution is 5%, and the mass concentration of OHEC is 3%.

[0064] In this embodiment, a mixture of fluff pulp and high molecular water-absorbent resin (SAP) is wrapped inside the non-woven fabric.

[0065] In this embodiment, the leakproof bottom layer is a composite layer of a PE composite bottom film and a PP breathable micro film.

[0066] Example 2 Preparation of a Diaper Core

[0067] Compared with Example 1, the difference is that purslane, rosemary and banana flower are mixed in a mass ratio of 1:6:2, the extraction temperature of the antibacterial mixture is 75°C, and the other experimental steps and parameters are consistent with Example 1.

[0068] Example 3 Preparation of a Diaper Core

[0069] Compared with Example 1, the difference is that purslane, rosemary and banana flower are mixed in a mass ratio of 1:6:4, and the other experimental steps and parameters are consistent with Example 1.

[0070] Example 4 Preparation of a Diaper Core

[0071] Compared with Example 1, the difference is that purslane, rosemary and banana flower are mixed in a mass ratio of 1:2:4, the extraction temperature of the antibacterial mixture is 85°C, and the other experimental steps and parameters are consistent with Example 1.

[0072] Example 5 Preparation of a Diaper Core

[0073] Compared with Example 1, the difference is that purslane, rosemary and banana flower are mixed in a mass ratio of 1:2:2, and the other experimental steps and parameters are consistent with Example 1.

[0074] Comparative Example 1

[0075] Compared with Example 1, the difference is that the mixture is purslane and rosemary lotus mixed in a mass ratio of 1:3, and the other experimental steps and parameters are consistent with Example 1.

[0076] Comparative Example 2

[0077] Compared with Example 1, the difference is that the mixture is purslane and banana flower mixed in a mass ratio of 1:3, and the other experimental steps and parameters are consistent with Example 1.

[0078] Comparative Example 3

[0079] Compared with Example 1, the difference is that the mixture is a mixture of rosemary and banana flowers in a mass ratio of 1:1, and the other experimental steps and parameters are consistent with Example 1.

[0080] Comparative Example 4

[0081] Compared with Example 1, the difference is that the extraction temperature of the antibacterial mixed solution is 100° C., and the other experimental steps and parameters are consistent with Example 1.

[0082] Comparative Example 5

[0083] Compared with Example 1, the difference is that the preparation method of the antibacterial mixed solution is different, and the other experimental steps and parameters are consistent with Example 1. The specific extraction method of the antibacterial mixed solution of this comparative example is as follows:

[0084] According to the mass ratio of purslane, rosemary and banana flower of 1:3:3, weigh the corresponding weight of purslane, rosemary and banana flower;

[0085] Preparation of Purslane water extract: grind Purslane, extract with water at a mass volume ratio of 1g:8mL at 80℃ for 1.5h, filter and obtain Purslane water extract;

[0086] Preparation of rosemary water extract: grind rosemary, extract with water at a mass volume ratio of 1g:8mL at 80℃ for 1.5h, filter and obtain rosemary water extract;

[0087] Preparation of banana flower water extract: crush banana flowers, extract with water at a mass volume ratio of 1g:8mL at 80℃ for 1.5h, filter and obtain banana flower water extract;

[0088] The purslane water extract, rosemary water extract and banana flower water extract are mixed to obtain an antibacterial mixed solution; wherein the mass concentrations of purslane, rosemary and banana flower in the antibacterial mixed solution are consistent with those in Example 1.

[0089] Taking Purslane as an example, mass concentration (g / mL) = mass of Purslane added (g) / volume of antibacterial mixed solution (mL).

[0090] Comparative Example 6

[0091] Compared with Example 1, the difference is that the upper absorbent core is a spunlace non-woven fabric that has not been gel-modified, and the other experimental steps and parameters are consistent with Example 1.

[0092] Comparative Example 7

[0093] Compared with Example 1, the difference is that the hydrophilic non-woven fabric of the antibacterial layer is not immersed in the antibacterial mixed liquid, and the other experimental steps and parameters are consistent with those of Example 1.

[0094] Comparative Example 8

[0095] Compared with Example 1, the difference is that the hydrophilic nonwoven fabric of the antibacterial layer is not soaked in the antibacterial mixed liquid, the upper absorbent core is a spunlace nonwoven fabric that has not been gel-modified, and the other experimental steps and parameters are consistent with Example 1.

[0096] Effect Example 1

[0097] Antimicrobial testing

[0098] Experimental method: The diaper cores prepared in Examples 1 to 5 and Comparative Examples 1 to 8 were cut into 20*30 mm square pieces respectively, and the diaper core prepared in Comparative Example 8 was used as a control sample. The antibacterial rates of Escherichia coli, Staphylococcus aureus, and Candida albicans were detected according to Part E6.3 of GB15979-2024 "Hygiene Requirements for Disposable Sanitary Products". The experimental results are shown in Table 1.

[0099] Table 1 Antibacterial effect of each group.

[0100]

[0101]

[0102] It can be seen from Table 1 that the antibacterial diaper core prepared in the embodiment of the present invention has good inhibitory effect on Escherichia coli, Staphylococcus aureus and Candida albicans, with an inhibition rate of more than 98%. The present invention uses a mixture of purslane, rosemary and banana flowers, and extracts the mixed antibacterial liquid obtained within a certain temperature range as the antibacterial layer, and utilizes the synergistic effect of the three to exert a better antibacterial effect.

[0103] The antibacterial rates of Comparative Example 1 (the antibacterial mixture does not contain banana flowers), Comparative Example 2 (the antibacterial mixture does not contain rosemary) and Comparative Example 3 (the antibacterial mixture does not contain purslane) against Escherichia coli, Staphylococcus aureus and Candida albicans, which are common in urine, are significantly reduced. Compared with Example 1, the antibacterial rates of Comparative Example 1, Comparative Example 2 and Comparative Example 3 against Escherichia coli decreased by 29.39%, 23.58% and 19.19% respectively; the antibacterial rates of Comparative Example 1, Comparative Example 2 and Comparative Example 3 against Staphylococcus aureus decreased by 27.99%, 22.13% and 20.57% respectively; the antibacterial rates of Comparative Example 1, Comparative Example 2 and Comparative Example 3 against Candida albicans decreased by 27.80%, 23.38% and 19.33% respectively. It can be seen that when a raw material drug is missing in the antibacterial mixture, the antibacterial performance of the prepared diapers is significantly reduced.

[0104] In Comparative Example 4, when the antibacterial mixed liquid was prepared, the extraction temperature was 100°C, and then the prepared antibacterial mixed liquid was used to prepare the diaper core, and the antibacterial performance was significantly reduced, with the antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans being only 60.55%, 61.87%, and 61.52%, respectively. This may be because the high extraction temperature inactivated the active substances in the raw materials, thereby causing the antibacterial performance to decline.

[0105] In Comparative Example 5, the preparation method of the antibacterial mixed liquid was changed, and the antibacterial performance of the prepared diaper core was significantly reduced compared with that in the embodiment, and the antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans were 60.11%, 60.52%, and 59.88%, respectively. The results showed that only the diaper core prepared with the antibacterial mixed liquid prepared by the preparation method of the antibacterial mixed liquid of the present invention had better antibacterial performance.

[0106] In Comparative Example 6, the upper absorbent core was not modified with the gel having antibacterial properties, and the antibacterial rate of the prepared diaper decreased to a certain extent compared with that in Example 1.

[0107] In Comparative Example 7, the diaper core was not immersed in the antibacterial mixed liquid. The experimental results showed that the antibacterial rates against Escherichia coli, Staphylococcus aureus and Candida albicans were significantly reduced.

[0108] Effect Example 2

[0109] Experimental method: Use a funnel to add liquid to the metal ring. Take two portions of 80 mL of 0.9% saline and add liquid at 0 min and 8 min respectively. Start timing when adding liquid and record the absorption time until the liquid level disappears in the absorption zone. The time it takes to complete each absorption is the absorption rate in seconds. 5 minutes after adding liquid, use absorbent paper of known mass to apply pressure of 3.5 kg for 3 minutes, take out the absorbent paper and weigh it. According to the weight difference before and after the absorbent paper, the back seepage amount in grams is obtained.

[0110] Experimental results:

[0111] Table 2 Absorption performance of diaper core of Examples 1 to 5 and Comparative Examples 1 to 8

[0112] Group First absorption speed / s Second absorption rate / s Re-seepage amount / g Example 1 12 11 0.8 Example 2 11 9 0.9 Example 3 13 10 0.9 Example 4 12 11 1.0 Example 5 12 10 1.0 Comparative Example 1 13 11 1.1 Comparative Example 2 14 12 1.0 Comparative Example 3 11 9 0.9 Comparative Example 4 15 13 1.2 Comparative Example 5 13 12 1.1 Comparative Example 6 22 23 8.5 Comparative Example 7 14 11 1.0 Comparative Example 8 22 24 9.2

[0113] The experimental results are shown in Table 2. It can be seen from the table that the diaper cores of Examples 1 to 5 of the present invention all have a faster absorption speed and less re-seepage. The main reason is that the surface layer of the present invention adopts a combination of hydrophobic non-woven fabric and hydrophilic non-woven fabric. Due to the difference in hydrophilicity and hydrophobicity at both ends, a unidirectional moisture conduction is formed, which increases the absorption speed and is not easy to re-seep. At the same time, the absorption layer adopts a double-layer absorption core, in which the upper absorption core is a non-woven fabric modified with a water-absorbent gel, which can further enhance the absorption speed of the liquid. Comparative Examples 1 to 5 and Comparative Example 7 are mainly changes to the antibacterial layer, and do not involve the unidirectional moisture conduction and absorption layer of the surface layer. Therefore, they also have better absorption speed and anti-reverse osmosis ability.

[0114] In Comparative Examples 6 and 8, the upper absorbent core is not modified with gel, resulting in a sharp decrease in its absorption rate and absorption amount, and it is more susceptible to re-seepage under the same conditions.

[0115] Effect Example 3

[0116] The diaper cores of Examples 1 to 5 and Comparative Examples 1 to 8 were processed into diapers by Guangdong Yusheng Personal Care Products Co., Ltd. with specification L. The diapers produced all comply with all the provisions of Part 1 of GB / T28004.1-2021 standard "Infant Diapers".

[0117] 65 infants and young children who are prone to diaper rash (most brands of diapers purchased on the market will cause diaper rash) were recruited and randomly divided into 13 groups, with 5 children in each group, for a one-month trial. Before the trial, all caregivers of infants and young children were trained uniformly: change diapers every 3 hours during the day (7 am to 10 pm) and twice at night; change diapers immediately when there is a bowel movement; clean the buttocks first when changing diapers. When diaper rash occurs, record it, stop using it in time, and use 0.1% hydrocortisone butyrate cream.

[0118] The feedback results are shown in Table 3 below:

[0119] Table 3 Feedback from infants and young children after continuous testing of diapers for one month

[0120]

[0121]

[0122] It can be seen from Table 3 that the diapers prepared by Examples 1 to 5 of the present invention rarely cause diaper rash after being worn by infants and young children. This is probably because the diapers can quickly absorb urine during wearing, keep the surface layer dry, and have excellent anti-reseepage effect, so that the buttocks of infants and young children are continuously in a dry environment. At the same time, the antibacterial layer of the surface layer plays an antibacterial role, greatly reducing the incidence of diaper rash.

[0123] Since the antibacterial effects of Comparative Examples 1 to 5 and Comparative Example 7 are weakened, infants and young children may develop diaper rash due to bacterial growth during wearing, so the incidence of diaper rash is slightly higher than that of Examples 1 to 5.

[0124] The diaper core prepared in Comparative Example 6 shows decreased moisture absorption and anti-reseepage properties. When it is prepared into diapers, infants and young children may be in a hot and humid environment due to untimely absorption and reseepage during wearing, which leads to an increase in the number of diapers with red buttocks. The diapers prepared in Comparative Example 8 do not contain any antibacterial ingredients, and the upper absorbent core has not been gel-modified, so the antibacterial performance, moisture absorption and anti-reseepage properties are all reduced. When infants and young children are wearing, their buttocks may be in a hot and humid environment due to untimely absorption, which leads to the occurrence of red buttocks. At the same time, since it does not have excellent antibacterial properties, bacteria are easily bred in a hot and humid closed environment, further aggravating the red buttocks phenomenon.

[0125] 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 equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An antibacterial mixed solution, characterized in that: The antibacterial mixed liquid is a mixed water extract of purslane, rosemary and banana flowers; the preparation method of the mixed water extract is: mixing purslane, rosemary, banana flowers and water, and extracting at 75-85°C; wherein the mass ratio of purslane, rosemary and banana flowers is 1:2-6:2-4.

2. The antibacterial mixed solution according to claim 1, characterized in that: The mass volume ratio of the mixture of purslane, rosemary and banana flower to water is 1:4-10 g / mL.

3. The antibacterial mixed solution according to claim 1, characterized in that: The extraction time is 1.5 to 3 hours.

4. The antibacterial mixed solution according to claim 1, characterized in that: The mass ratio of purslane, rosemary and banana flower is 1:2~4:2~4.

5. A diaper core, 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 nonwoven fabric containing the antibacterial mixed solution according to any one of claims 1 to 4.

6. The diaper core according to claim 5, characterized in that: The method for preparing the antibacterial layer is: immersing the hydrophilic non-woven fabric in the antibacterial mixed solution described in any one of claims 1 to 4.

7. The diaper core according to claim 5, 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.

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

9. The method for preparing a diaper core according to any one of claims 5 to 8, characterized in that: The hydrophobic nonwoven fabric layer, the antibacterial layer, the absorbent layer and the leakproof bottom layer are sequentially bonded by hot melt adhesive to obtain the product.

10. Use of the diaper core according to any one of claims 5 to 8 in the preparation of disposable absorbent products.

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