A pressed sanitary wet wipe and a method for preparing the same

Abstract

The present disclosure relates to a kind of pressing sanitary wipes and its preparation method, comprising: S1, plant active component is mixed with wall material solution, is coated by crosslinking, and plant active coated particle is obtained;S2, plant active coated particle is set in the middle non-woven fabric layer in multi-layer non-woven fabric, plant active coated particle is made into the connecting structure with the fiber of middle non-woven fabric layer by bonding fluid, then middle non-woven fabric layer is laminated with other non-woven fabric layer, and composite wet wipe base material is obtained;S3, cationic active agent, humectant and auxiliary are mixed in water, and composite sanitary liquid is obtained;S4, the composite wet wipe base material is soaked in the composite sanitary liquid, adjusts sanitary liquid load and is sealed package, and pressing sanitary wipes are obtained, by separating plant active material granulation from free cationic active agent in space, non-woven fabric is changed into carrier with storage and trigger function, realizes the stability of pressing wet wipe component and immediate release function when pressing is used.

Description

Technical Field

[0001] This disclosure relates to the field of hygiene products technology, and more specifically, to a press-type sanitary wipe and its preparation method. Background Technology

[0002] Pump-type wet wipes are widely used for cleaning skin and object surfaces in medical institutions, public places, and homes due to their convenience and controllable dispensing volume. Currently, multi-functional wet wipes that combine hygiene and skin care have become the mainstream in the market.

[0003] However, existing composite sanitary wipes have the following technical problems: 1. When plant extracts that play a role in skin care and quaternary ammonium salt active agents coexist in the aqueous phase for a long time, the polyphenols, flavonoids, and organic acid active ingredients in the plant extracts are prone to complexation reactions or electrostatic binding with cationic quaternary ammonium salts, resulting in a decrease in the effective concentration of quaternary ammonium salts. At the same time, the active ingredients of the plants also undergo structural changes and lose their care efficacy; 2. When plant extracts are in a dissolved or dispersed state in the aqueous environment for a long time, the polysaccharides, flavonoids and other components are prone to hydrolysis, oxidation, browning and other deterioration reactions. The active ingredients continue to decay during the shelf life of the wipes, resulting in the inability to release them immediately when pressed.

[0004] The prior art discloses a sustained-release wet wipe based on essential oil microcapsules, but the encapsulation object of this solution is hydrophobic essential oil, which solves the problem of essential oil volatilization. Its microcapsule wall material is a hydrophilic natural polymer, which is more difficult to maintain stability in a wet wipe system with high water content.

[0005] Therefore, there is an urgent need in this field for a method for preparing press-type sanitary wipes that can solve the above problems, both protecting the plant active ingredients from degradation in the aqueous environment and the effects of compatibility reactions with quaternary ammonium salts, and enabling the immediate release of plant active ingredients during use. Summary of the Invention

[0006] The purpose of this disclosure is to provide a press-type sanitary wipe and its preparation method, which solves the problem that the coexistence of active agents and plant active substances in existing press-type sanitary wipes leads to a decrease in activity and the inability to release them immediately when pressed.

[0007] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0008] According to one aspect of this disclosure, a method for preparing a press-type sanitary wipe is provided, comprising: S1, plant active components are mixed with wall material solution and cross-linked to obtain plant active coated particles; S2, plant active coating particles are placed in the middle non-woven fabric layer in a multi-layer non-woven fabric, and the plant active coating particles and the fibers of the middle non-woven fabric layer are connected by an adhesive liquid. Then the middle non-woven fabric layer is stacked with other non-woven fabric layers to obtain a composite wet wipe substrate. S3, add cationic surfactant, moisturizer and auxiliary agent to water and mix to obtain compound sanitary solution; S4, the composite wet wipe substrate is immersed in the compound sanitary solution, the sanitary solution load is adjusted and the package is sealed to obtain press-type sanitary wet wipes.

[0009] On the other hand, a press-type sanitary wipe is also provided, which is prepared by the press-type sanitary wipe preparation method, comprising: a multilayer nonwoven fabric substrate, plant active coating particles disposed inside the multilayer nonwoven fabric substrate, the plant active coating particles being connected to the fibers of the nonwoven fabric substrate by a connection structure formed by curing with an adhesive liquid, and a compound sanitary liquid loaded on the nonwoven fabric substrate.

[0010] As can be seen from the above technical solutions, the exemplary embodiments disclosed herein possess at least the following advantages and positive effects: On the one hand, by using cross-linked and dense wall materials to encapsulate plant active components to form plant active coated particles, a protective barrier is formed on the outside of the coated particles, which reduces the degree of contact between plant active components and the external aqueous environment during storage, reducing the possibility of degradation reactions such as hydrolysis and oxidation of plant active components. At the same time, it reduces the probability of polar molecules such as polyphenols and flavonoids in plant active substances undergoing complexation or electrostatic binding reactions with cationic surfactants, thereby improving the compatibility and stability of plant active components and cationic surfactants under storage conditions. On the other hand, by having the cationic surfactant exist in a free state in the compound sanitary solution and independently setting the coated particles in the middle fiber layer of the nonwoven fabric, the sanitary solution does not come into contact with the plant active components inside the coated particles during the loading process. This simplifies the sanitary solution formulation and avoids unstable factors such as color, precipitation, and pH fluctuations caused by plant active components. At the same time, by utilizing the characteristic that the coated particles remain intact when not pressed and rupture when pressed, the plant active components are released and mixed with the sanitary solution only at the moment of pressing and removing the wipe. This achieves the simultaneous synergy of instant cleaning by cationic surfactant and instant care by plant active ingredients, solving the problem of premature degradation of plant active components in existing press-type sanitary wipes, which prevents them from being released in time.

[0011] In summary, this technical solution transforms nonwoven fabric from a single carrier of sanitary liquid into a carrier with both storage and triggering functions by spatially separating the granulation of plant active ingredients from the free cationic surfactant. This achieves component stability of the compounded press-type wet wipes during the shelf life and instant release during press-type use.

[0012] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the preparation method of the press-type sanitary wipes according to the embodiments of this disclosure; Figure 2 This is a schematic diagram of the preparation method of the plant active microcapsules described in step S1 of the present disclosure. Figure 3 This is a schematic diagram of the composite wet wipe substrate structure described in step S2 of the present invention. Figure 4 This is a schematic diagram showing the relationship between the microcapsules and the second nonwoven fabric layer in step S2 of the present invention. Figure 5 This is a schematic diagram of the preparation method of the press-type sanitary wipes described in step S4 of the present invention. Detailed Implementation

[0014] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0015] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, steps, etc., can be employed. In other instances, well-known methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0016] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0017] This disclosure provides a method for preparing press-type sanitary wipes. The method involves pre-preparing plant-active components into plant-active coated particles and independently placing the plant-active coated particles in the middle non-woven layer of a multi-layer non-woven fabric. This keeps the plant-active components and the cationic surfactants in the sanitary solution spatially isolated during storage, thereby preventing the plant-active components and surfactants from degrading due to long-term immersion in the aqueous phase. At the same time, during use, the mechanical action of picking up and wiping promotes the release of plant-active components, achieving a synergistic effect of immediate cleaning and plant-active care.

[0018] In one implementation, such as Figure 1 As shown, a method for preparing a press-type sanitary wipe includes the following steps: S1, plant active components are mixed with wall material solution and cross-linked to obtain plant active coated particles; S2, plant active coating particles are placed in the middle non-woven fabric layer in a multi-layer non-woven fabric, and the plant active coating particles and the fibers of the middle non-woven fabric layer are connected by an adhesive liquid. Then the middle non-woven fabric layer is stacked with other non-woven fabric layers to obtain a composite wet wipe substrate. S3, add cationic surfactant, moisturizer and auxiliary agent to water and mix to obtain compound sanitary solution; S4, the composite wet wipe substrate is immersed in the compound sanitary solution, the sanitary solution load is adjusted and the package is sealed to obtain press-type sanitary wet wipes.

[0019] This disclosure, through the aforementioned steps, changes the direct coexistence of plant-based active ingredients and cationic surfactants in traditional wet wipe systems to a spatially separated manner. Specifically, the coated particles are not directly dispersed in the compounded sanitary solution, but are pre-fixed within the intermediate fiber layer of the nonwoven fabric. This ensures that the compounded sanitary solution is only loaded within the nonwoven fabric fiber network and does not directly contact the plant-based active ingredients inside the coated particles. This structure avoids the interaction between plant-based active ingredients and cationic surfactants during long-term storage, improving the storage stability of the wet wipe products.

[0020] In one embodiment, the plant active component-coated particles are plant active microcapsules.

[0021] In one implementation, such as Figure 2 As shown, step S1 includes: S1.1, Add the plant active components to deionized water, pre-disperse them to obtain a plant active dispersion, then add it to the wall material solution and stir and mix at 20-50℃ to obtain a coating precursor solution; S1.2, add the coating precursor liquid to the crosslinking agent to cause the wall material to undergo a crosslinking reaction in the plant active dispersion, separate the solid and liquid, wash to remove unreacted wall material and crosslinking agent, and dry to obtain plant active microcapsules.

[0022] In one embodiment, the plant-active component includes at least one of aloe vera leaf extract, chamomile extract, and honeysuckle extract.

[0023] The wall material is a calcium alginate gel wall material formed by cross-linking sodium alginate, and the cross-linking agent includes calcium chloride or calcium lactate.

[0024] Specifically, the plant active components are first pre-dispersed in deionized water to ensure uniform distribution of the active ingredients in the plant extract, thus preventing uneven coating thickness due to excessively high local concentrations during the subsequent coating process. Then, the plant active dispersion is added to a sodium alginate solution, where the interaction between the sodium alginate molecular chains and the plant active components forms a uniformly dispersed system.

[0025] When calcium chloride or calcium lactate is added, calcium ions undergo ionic cross-linking with the carboxyl groups in the sodium alginate molecular chain, forming a three-dimensional cross-linked network structure between the sodium alginate molecular chains. This results in a continuous gel wall layer outside the plant active components, yielding plant active microcapsules.

[0026] In this embodiment, the formed calcium alginate gel wall material does not block the external environment through hydrophobic interactions. Instead, it utilizes a dense three-dimensional network structure formed by cross-linking to reduce the migration rate of water molecules and external solutes into the microcapsules, creating a slow exchange interface between the plant active components and the external aqueous environment. Therefore, during long-term storage of the wipes, the possibility of hydrolysis, oxidation, and other degradation reactions of the plant active components can be reduced.

[0027] Furthermore, since polyphenols and flavonoids in plant active components have a certain polarity, if they coexist directly with cationic surfactants such as benzalkonium chloride and cetylpyridinium chloride in the same liquid system, they are prone to complexation, adsorption, or electrostatic binding, thereby reducing the effective concentration of the cationic surfactants. This embodiment uses microencapsulation to maintain physical isolation between the plant active components and the cationic surfactants during storage, reducing the probability of interaction between the two.

[0028] In one embodiment, the plant-active microcapsules have a particle size of 50–500 μm and a wall thickness of 5–50 μm.

[0029] When the particle size of plant-active microcapsules is too small, the wall thickness decreases, making the plant-active components more susceptible to external environmental influences. When the particle size is too large, it hinders the microcapsules from entering the gaps between the nonwoven fabric fibers and distributing evenly. This disclosure improves storage stability by controlling the particle size range of plant-active microcapsules, enabling them to enter the fiber network of the intermediate nonwoven fabric layer while ensuring sufficient wall thickness.

[0030] In one embodiment, step S2 includes: S2.1, a first nonwoven fabric layer, a second nonwoven fabric layer and a third nonwoven fabric layer are provided, the second nonwoven fabric layer is located between the first nonwoven fabric layer and the third nonwoven fabric layer, plant active microcapsules are dispersed in an adhesive liquid to obtain a mixture, the mixture is applied to the surface of the second nonwoven fabric layer, so that the plant active microcapsules enter the interior of the second nonwoven fabric layer with the adhesive liquid; like Figure 3 As shown, in this embodiment, the first nonwoven fabric layer, the second nonwoven fabric layer and the third nonwoven fabric layer are stacked in sequence, the second nonwoven fabric layer serves as the inner support layer, and the plant active microcapsules are distributed in the fiber gaps of the second nonwoven fabric layer.

[0031] S2.2, the first nonwoven fabric layer, the second nonwoven fabric layer and the third nonwoven fabric layer are stacked together, and the edges of the stacked area are sealed by hot pressing or adhesive bonding, so that the fiber gaps of the second nonwoven fabric layer serve as storage areas for accommodating plant active microcapsules. like Figure 4 As can be seen, the plant-active microcapsules are located in the interfiber gap region inside the second nonwoven fabric layer, which constitutes a storage area for accommodating the plant-active microcapsules.

[0032] S2.3, the sealed nonwoven fabric is then rolled with a rolling pressure of 0.1 to 1 MPa to ensure that the plant active microcapsules are in full contact with the fibers of the second nonwoven fabric layer, and the bonding structure is formed by curing with adhesive liquid, so that the plant active microcapsules are kept inside the second nonwoven fabric layer, thus obtaining the composite wet wipe substrate.

[0033] In this embodiment, the plant-active microcapsules are placed inside the middle nonwoven layer of the multi-layer nonwoven fabric structure, rather than on the surface of the wet wipe or directly mixed into the sanitary solution.

[0034] Specifically, after dispersing the plant-active microcapsules in the binder, the fluidity of the binder allows the microcapsules to enter the fiber gaps of the second nonwoven fabric layer. After lamination and rolling, the binder solidifies, forming a connection structure between the outer wall of the plant-active microcapsules and the nonwoven fabric fibers, thus confining the plant-active microcapsules inside the second nonwoven fabric layer.

[0035] Through the above configuration, on the one hand, the first and third nonwoven fabric layers provide protection for the middle area, reducing mechanical damage to the microcapsules during the processing, packaging, and transportation of the wet wipes; on the other hand, the fiber gaps inside the second nonwoven fabric layer provide storage space for the microcapsules, enabling them to exist stably inside the wet wipes.

[0036] Compared with the existing technology of directly adding plant extracts into sanitary solutions, this disclosure does not improve stability by adjusting the liquid phase formulation, but changes the existence form and spatial position of the plant active components, so that the plant active components and cationic surfactants are in different spatial regions under storage conditions.

[0037] Furthermore, during use, as the wipes are removed from the press-pack packaging, the middle non-woven fabric layer is compressed, and the plant-active microcapsules are subjected to mechanical force. This causes local damage to the cross-linked gel wall layer or the formation of release channels, allowing the internal plant-active components to be released and come into contact with the compound sanitary solution soaked in the non-woven fabric. This achieves a synergistic effect of immediate cleaning with active agents and immediate care with plant-active ingredients.

[0038] In one embodiment, in step S2, the first nonwoven layer, the second nonwoven layer, and the third nonwoven layer may be made of the same or different nonwoven materials.

[0039] The nonwoven fabric includes, but is not limited to, one or more of spunlace nonwoven fabric, hot-air nonwoven fabric, needle-punched nonwoven fabric, and spunbond nonwoven fabric. Preferably, the first and third nonwoven fabric layers are made of spunlace nonwoven fabric with high wet strength and abrasion resistance, and the second nonwoven fabric layer is made of spunlace nonwoven fabric with high fiber porosity to facilitate the entry of plant-active microcapsules into the fiber network.

[0040] The basis weight of the second nonwoven layer is 30-100 g / m². 2 The average fiber diameter is 5–30 μm, and the porosity is 50–90%.

[0041] When the porosity of the second nonwoven layer is too low, plant-active microcapsules have difficulty entering the fiber interior and tend to aggregate on the surface, leading to reduced microcapsule fixation stability. When the porosity is too high, although it facilitates microcapsule entry, it reduces the structural strength of the intermediate layer. Therefore, by controlling the fiber structure of the second nonwoven layer, it is possible to provide storage space for microcapsules while maintaining the overall structural stability of the wet wipe.

[0042] In one embodiment, the adhesive is selected from at least one of sodium alginate solution, sodium carboxymethyl cellulose solution, and polyvinyl alcohol solution, and has a mass concentration of 0.5-2%.

[0043] The adhesive is used to carry the plant-active microcapsules into the interior of the second nonwoven fabric layer, and to form a solidified connection structure during the subsequent rolling process, so that the plant-active microcapsules and the nonwoven fabric fibers form a stable bond.

[0044] It should be noted that the role of the adhesive in this disclosure is not simply to adhere the plant-active microcapsules to the surface of the nonwoven fabric, but to embed the plant-active microcapsules into the interior of the second nonwoven fabric layer, and to stably maintain the plant-active microcapsules in the intermediate fiber layer through fiber entanglement, curing of the adhesive, and bonding between the microcapsule wall layers.

[0045] If plant-based active microcapsules are simply added directly to the wet wipe liquid, the microcapsules will remain in continuous contact with the sanitary solution during long-term storage, failing to resolve the compatibility issue between the plant-based active ingredients and the cationic surfactants. If the microcapsules are merely attached to the surface of the nonwoven fabric, they are prone to detachment during folding, packaging, and transportation of the wet wipes. Therefore, this disclosure utilizes a structural design that stores the plant-based active microcapsules within an intermediate nonwoven fabric layer, providing a stable storage space and spatial separation from the compounded sanitary solution.

[0046] In one embodiment, step S3 includes: S3.1, Add the cationic surfactant to water and stir at 100-800 rpm for 10-60 minutes at 20-40℃ to fully dissolve the cationic surfactant and obtain a cationic surfactant solution; S3.2, add a humectant to the cationic active solution and continue stirring and mixing for 10 to 60 minutes, then add an auxiliary agent, stir, and obtain a mixture. Let it stand to remove bubbles, and then filter it through a 0.22 to 1 μm filter membrane to remove undissolved particles, thus obtaining a compound sanitary solution.

[0047] In one embodiment, the cationic surfactant is at least one of benzalkonium chloride and cetylpyridinium chloride.

[0048] The moisturizer is at least one of glycerin and propylene glycol.

[0049] The adjuvant includes at least one of chlorphenesin and vitamin E.

[0050] In a preferred embodiment, the additives also include citric acid.

[0051] Specifically, the compounded sanitary solution in this disclosure is only used to load the nonwoven fabric fiber structure, and its main function is to provide an immediate cleaning environment, without undertaking the storage function of plant active components. Therefore, this disclosure does not require the direct addition of plant extracts to the sanitary solution system, nor does it require the improvement of the stability of plant active components by significantly increasing stabilizers, antioxidants, or buffers.

[0052] Unlike existing technologies that mix plant extracts, cationic surfactants, humectants, etc., to form a single sanitary liquid system, this disclosure separates the plant active components from the liquid phase system, allowing the cationic surfactants to exist in a relatively stable free state in the sanitary liquid.

[0053] Since the cleaning effect of cationic surfactants mainly relies on the adsorption and disruption of microbial cell membranes by their positively charged quaternary ammonium salt structure, a high effective ion concentration needs to be maintained. When polar compounds such as polyphenols and flavonoids from plant active components are directly present in the sanitation solution, the effectiveness of the cationic surfactants may be reduced through hydrogen bonding, electrostatic interactions, or complexation. This disclosure reduces the above-mentioned interactions through a spatially isolated structure, thus maintaining good cleaning activity of the cationic surfactants.

[0054] In one embodiment, step S4 includes: S4.1, The composite wet wipe substrate is immersed in the compound sanitary solution, so that the compound sanitary solution penetrates along the gaps between the nonwoven fabric fibers and is loaded inside the nonwoven fabric; S4.2, the impregnated non-woven fabric is squeezed to distribute the sanitary liquid evenly, and the sanitary liquid load is adjusted by the degree of squeezing. The adjusted non-woven fabric is then sealed and packaged to obtain press-type sanitary wipes.

[0055] In one embodiment, in step S4.2, the extrusion processing pressure is 0.01 to 0.5 MPa, and the time is 1 to 30 seconds.

[0056] Specifically, after the composite wet wipe substrate is immersed in the compounded sanitary solution, the sanitary solution first enters the fiber network of the first and third nonwoven layers and gradually diffuses towards the outer area of ​​the second nonwoven layer. Since the plant-active microcapsules are located inside the second nonwoven layer and are fixed between the fibers by an adhesive structure, the compounded sanitary solution does not rapidly enter the microcapsules under normal immersion conditions.

[0057] By controlling the squeezing pressure and time, the content of sanitary liquid in the non-woven fabric can be adjusted to ensure even distribution of the sanitary liquid, while avoiding excessive liquid load that could cause liquid to separate during the storage of the wipes.

[0058] During packaging and storage, the plant-active microcapsules maintain their intact structure, and the internal plant-active components remain protected. When the user presses to remove the wipe according to the instructions and pulls it out, the wipe is squeezed and bent during removal, and the microcapsule wall is subjected to mechanical stress, which promotes the release of plant-active components into the surrounding sanitary environment.

[0059] Thus, a complex system containing cationic surfactants and plant-based active ingredients is formed instantly upon use. The cationic surfactants provide rapid cleansing, while the plant-based active ingredients offer soothing, moisturizing, and auxiliary care benefits, achieving simultaneous cleansing and conditioning.

[0060] In one embodiment, this disclosure also provides a press-type sanitary wipe, prepared by the method for preparing press-type sanitary wipes described in any of the above embodiments, comprising: A multilayer nonwoven fabric substrate, plant-active microcapsules disposed inside the multilayer nonwoven fabric substrate, the plant-active microcapsules being connected to the fibers of the multilayer nonwoven fabric substrate through a connecting structure formed by curing with an adhesive liquid, and a compound sanitary solution loaded on the multilayer nonwoven fabric substrate.

[0061] The multilayer nonwoven fabric substrate includes a first nonwoven fabric layer, a second nonwoven fabric layer, and a third nonwoven fabric layer, with the second nonwoven fabric layer located between the first and third nonwoven fabric layers.

[0062] The plant-active microcapsules are mainly distributed in the fiber gaps inside the second nonwoven fabric layer, and are connected to the fibers of the second nonwoven fabric layer through a connection structure formed by curing with an adhesive liquid.

[0063] Example 1: Spunlace nonwoven fabric is provided as the first, second, and third nonwoven layers, respectively, wherein the basis weight of the first and third nonwoven layers is 40 g / m². 2 The basis weight of the second nonwoven layer is 60 g / m². 2 .

[0064] Aloe vera leaf extract was pre-dispersed in deionized water to obtain a plant-active dispersion. Sodium alginate was dissolved in deionized water to obtain a 2% (w / w) wall material solution. The plant-active dispersion was added to the wall material solution, and the mixture was stirred at 35°C for 30 minutes to obtain a coating precursor solution.

[0065] Calcium chloride solution was added to the coating precursor solution to induce an ionic cross-linking reaction of sodium alginate, forming a dense cross-linked calcium alginate gel wall layer on the outside of the plant active component. After the reaction was completed, solid-liquid separation was performed, and the mixture was washed three times with deionized water to remove unreacted sodium alginate and calcium chloride. The mixture was then vacuum dried at 50°C to obtain plant active microcapsules.

[0066] The plant-based active microcapsules were found to have an average particle size of 180 μm and a wall thickness of approximately 20 μm.

[0067] The above-mentioned plant-active microcapsules were added to a 1% sodium alginate solution and stirred until homogeneous to obtain a microcapsule-binder mixture. This mixture was then applied to the surface of a second nonwoven fabric layer, allowing the plant-active microcapsules to enter the interfiber spaces of the second nonwoven fabric layer along with the binder. The amount of plant-active microcapsules added was 10% of the total mass of the nonwoven fabric.

[0068] The first, second, and third nonwoven fabric layers are sequentially stacked, and the edges of the stacked area are heat-sealed to ensure that the second nonwoven fabric layer is located inside the composite wet wipe substrate. Subsequently, the composite nonwoven fabric is treated by roller pressing at a pressure of 0.3 MPa for 10 seconds to cure the adhesive, forming a connection structure between the plant-active microcapsules and the fibers of the second nonwoven fabric layer. This ensures that the plant-active microcapsules are stably maintained inside the second nonwoven fabric layer, resulting in the composite wet wipe substrate.

[0069] A compound sanitary solution was prepared, comprising 0.13 wt% benzalkonium chloride, 0.06 wt% cetylpyridinium chloride, 0.50 wt% glycerin, and 0.20 wt% propylene glycol, with the balance being deionized water. Benzalkonium chloride and cetylpyridinium chloride were added to the water and stirred at 500 rpm for 30 minutes at 30°C to ensure complete dissolution of the cationic surfactants. Glycerin and propylene glycol were then added and stirring continued for 20 minutes. The mixture was allowed to stand to remove bubbles and then filtered through a 0.45 μm filter membrane to obtain the compound sanitary solution.

[0070] The composite wet wipe substrate was immersed in a compound sanitary solution, allowing the solution to penetrate and load the nonwoven fabric through the gaps between the fibers. Subsequently, it was subjected to a compression treatment at 0.1 MPa for 10 seconds to adjust the sanitary solution load, and then sealed and packaged to obtain the press-type sanitary wipes.

[0071] The prepared press-type sanitary wipes are placed into a press-type wipe packaging container. When using, the packaging container is laid flat, and the pressing part of the packaging container is pressed to the preset position, so that the wipes inside are gradually ejected under the action of the ejection mechanism. The wipes can then be taken out for use.

[0072] Example 2: The difference between this embodiment and Embodiment 1 is that the wall material system of the plant active microcapsules is different.

[0073] Specifically, the leaf extract of Aloe vera was added to deionized water for pre-dispersion treatment to obtain a plant active dispersion.

[0074] Sodium alginate and chitosan were dissolved separately in deionized water to prepare a composite wall material solution, wherein the mass ratio of sodium alginate to chitosan was 3:1. A plant-based active dispersion was added to the composite wall material solution and stirred at 40°C for 30 minutes to form a coating precursor solution.

[0075] Calcium chloride was added to the coating precursor solution to induce ionic cross-linking of sodium alginate, while simultaneously forming a composite cross-linked wall layer through the interaction between chitosan and the calcium alginate gel network. After solid-liquid separation, washing, and drying at 50°C, plant-active microcapsules were obtained. The average particle size of the obtained plant-active microcapsules was measured to be 220 μm, and the wall layer thickness was approximately 25 μm.

[0076] The preparation of the composite wet wipe substrate, the composition and impregnation of the compound sanitary solution, and the packaging process were all the same as in Example 1, resulting in press-type sanitary wet wipes.

[0077] Example 3: The difference between this embodiment and Embodiment 1 is that the plant active components are different.

[0078] Specifically, chamomile extract was used instead of aloe vera leaf extract in Example 1.

[0079] Chamomile extract was pre-dispersed in deionized water, then mixed with a 2% sodium alginate wall material solution. The mixture was stirred at 35°C for 30 minutes, followed by the addition of calcium chloride to initiate a cross-linking reaction, yielding plant-active microcapsules. The resulting plant-active microcapsules had an average particle size of 160 μm and a wall thickness of approximately 18 μm.

[0080] Subsequently, following the steps in Example 1, plant-active microcapsules were deposited inside the second nonwoven fabric layer using sodium alginate binder, and then laminated with the first and third nonwoven fabric layers to form a composite wet wipe substrate. The substrate was then impregnated with a compound sanitary solution of the same composition as in Example 1, and the sanitary solution load was adjusted by compression and sealed to obtain a press-type sanitary wipe.

[0081] Comparative Example 1: The difference between this comparative example and Example 1 is that the press-type sanitary wipes are prepared by directly coexisting plant active ingredients and cationic surfactants.

[0082] Specifically, the freeze-dried powder of Aloe vera leaf extract was added directly to the sanitary solution according to the amount of plant active components added in Example 1, along with benzalkonium chloride, cetylpyridinium chloride, glycerin, propylene glycol, citric acid, chlorphenesin, and vitamin E. The amount of each component added was consistent with the actual amount of the corresponding component added in Example 1.

[0083] In this embodiment, the sanitary solution does not contain plant-active microcapsule structures; the plant-active components are dispersed in a free state within the aqueous system. Ordinary three-layer nonwoven fabric is used as the wet wipe substrate. The aforementioned sanitary solution containing plant-active components is directly impregnated into the nonwoven fabric. After being squeezed to the same liquid load as in Example 1, it is sealed and packaged to obtain press-type sanitary wipes.

[0084] Comparative Example 2: The difference between this comparative example and Example 1 is that, instead of preparing plant-active microcapsules, the plant-active components are directly placed inside the second nonwoven fabric layer.

[0085] Specifically, aloe vera leaf extract was directly added to a 1% sodium alginate binder solution, mixed thoroughly, and then applied to the surface of the second nonwoven fabric layer, allowing the plant-active components to penetrate the interfibers of the second nonwoven fabric layer. Subsequently, following the same procedure as in Example 1, the first, second, and third nonwoven fabric layers were stacked and impregnated in the compound sanitary solution described in Example 1. After compression and sealing, a press-type sanitary wipe was obtained.

[0086] Comparative Example 3: The difference between this comparative example and Example 1 is that the plant-based active microcapsules were directly added to the compound sanitary solution.

[0087] Specifically, plant-active microcapsules were prepared according to the method of Example 1. The obtained plant-active microcapsules were directly added to the compound sanitary solution described in Example 1, so that the microcapsules were dispersed in the sanitary solution system. Subsequently, ordinary three-layer non-woven fabric was impregnated with the above-mentioned sanitary solution containing microcapsules, and the load was adjusted by squeezing and then sealed and packaged to obtain press-type sanitary wipes.

[0088] Test method: Stability test of plant active ingredients: Press-type sanitary wipes were stored in a constant temperature and humidity environment of 40℃ and 75% for 6 months. Before and after storage, the content of the main active ingredients of aloe vera extract in the wipes was detected by high performance liquid chromatography. The retention rate of plant active ingredients was calculated by the ratio of the active ingredient content after 6 months of storage to the initial content.

[0089] Stability test of cationic surfactant content: The contents of benzalkonium chloride and cetylpyridinium chloride in the compound sanitary solution before and after storage of wet wipes were detected by high performance liquid chromatography. The retention rate of effective ingredients was calculated by the ratio of the cationic surfactant content after 6 months of storage to the initial content.

[0090] Cleaning performance test: The test was conducted according to the method specified in the appendix of GB 15979-2002 "Hygienic Standard for Disposable Sanitary Products". Staphylococcus aureus, Escherichia coli and Candida albicans were used as test bacteria. The cleaning effect was calculated after the wet wipe was applied to the bacterial solution for 2 minutes.

[0091] Press-to-use release performance test: The prepared press-to-use sanitary wipes were subjected to storage state test: without mechanical treatment, the release amount of plant active ingredients in the sanitary liquid was detected; Press-to-use release test: simulating the process of pressing the wipes to remove them, a pressure of 0.2 MPa was applied to the wipes for 5 seconds, and the content of plant active ingredients in the sanitary liquid was detected. The microcapsule trigger release performance was evaluated by the change in the release amount of plant active components before and after pressing.

[0092] Table 1: Storage stability test results.

[0093] As shown in Table 1, after 6 months of storage at high temperature and humidity, the plant active components of the press-type sanitary wipes prepared in Examples 1-3 all retained more than 95%, while the retention rates of benzalkonium chloride and cetylpyridinium chloride all reached more than 97%.

[0094] In Example 1, the plant-based active ingredients were not directly added to the compound sanitary solution. Instead, they were placed inside the second non-woven fabric layer in the form of plant-based active microcapsules. Since the second non-woven fabric layer is located between the first and third non-woven fabric layers, the external sanitary solution is mainly loaded into the fiber gaps of the multi-layered non-woven fabric structure, forming a spatial isolation structure between the plant-based active microcapsules and the compound sanitary solution. Simultaneously, the plant-based active microcapsules are fixed inside the second non-woven fabric layer by a connecting structure formed by curing with an adhesive liquid, which avoids uneven distribution caused by microcapsule migration with the liquid during use.

[0095] Example 2 uses a calcium alginate gel network to form a composite cross-linked wall layer with chitosan, which improves the structural stability of the microcapsule wall layer, keeps the plant active ingredients inside the microcapsule during storage, and maintains the release capacity of the plant active ingredients during pressing.

[0096] In contrast, in Comparative Example 1, the plant active extract was directly added to the sanitary solution. Since the plant active ingredients coexisted with the cationic surfactant in the aqueous environment for a long time, they were prone to oxidation, hydrolysis and complexation reactions, resulting in a decrease in the retention rate of plant active components and a significant decrease in the effective content of cationic surfactant.

[0097] Although Comparative Example 2 uses a microcapsule structure, since the microcapsules are directly dispersed in the sanitary solution and are immersed in an aqueous environment containing cationic surfactants for a long time, ion exchange and solute diffusion still occur, so its stability is lower than that of the Example.

[0098] In Comparative Example 3, although the plant-active microcapsules did not directly contact the sanitary liquid, they were significantly affected by external mechanical forces during storage and transportation because they were placed on the surface non-woven fabric area. Some microcapsules ruptured prematurely, resulting in decreased stability.

[0099] Table 2: Cleaning performance test results.

[0100] As can be seen from Table 2, all embodiments and comparative examples exhibit high cleaning performance in the initial state.

[0101] Comparative Example 1, using a conventional method of directly combining plant extracts and cationic surfactants, still achieved a high cleaning effect in the initial state, indicating that this disclosure does not improve initial cleaning ability by altering the cationic surfactant itself. However, as shown in Table 1, the stability of the active ingredients in Comparative Example 1 decreased during long-term storage due to the coexistence of plant active ingredients and cationic surfactants. Examples 1-3, by independently placing the plant active components inside microcapsules and fixing them to the non-woven fabric interlayer, kept the cationic surfactants in a free state, thus improving long-term storage stability while maintaining the same cleaning effect.

[0102] Table 3: Test results of press-triggered release performance.

[0103] As shown in Table 3, in Examples 1-3, the release of plant active components was low under storage conditions without mechanical action, indicating that the plant active microcapsules can maintain their complete structure under storage conditions. After simulated application of a wet wipe, the release of plant active components increased significantly, with a release rate of over 90%, indicating that the plant active microcapsules can respond to external mechanical action to trigger release.

[0104] Comparative Example 1: Since the plant active components are directly present in the sanitary solution, they have already been completely released during storage and do not have a delayed release effect.

[0105] In Comparative Example 2, because the microcapsules were soaked in sanitary solution for a long time, some microcapsules were released prematurely, so the difference in release before and after pressing was small.

[0106] In Comparative Example 3, since the microcapsules are located in the surface area, although they have a certain release effect, they are easily affected by external factors, leading to premature release during storage.

[0107] In summary, this disclosure provides a press-type sanitary wipe and its preparation method. By using a calcium alginate cross-linked gel wall material to encapsulate the plant active components, the plant active components are transformed from a free state to a protected state, reducing the contact degree between the plant active components and the aqueous environment and cationic surfactants, thus improving the storage stability of the plant active substances. Then, by fixing the plant active microcapsules inside the middle nonwoven layer of a multilayer nonwoven fabric, instead of adding them directly to the compound sanitary solution, the plant active components and cationic surfactants form a spatially separated structure, avoiding the problem of effective ingredient loss caused by the long-term coexistence of plant extracts and quaternary ammonium salt surfactants in traditional wipes. By controlling the microcapsule particle size, wall thickness, and bonding method, the plant active microcapsules remain stable during storage, but break under mechanical action during wiping, achieving immediate release of the plant active substances.

[0108] The press-type sanitary wipes disclosed herein can solve the problem of decreased stability caused by the long-term coexistence of plant-based active ingredients and cationic surfactants in the prior art, and achieve a synergistic improvement in cleaning performance and plant care function.

[0109] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0110] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for preparing a press-type sanitary wipe, characterized in that, include: S1, plant active components are mixed with wall material solution and cross-linked to obtain plant active coated particles; S2, plant active coating particles are placed in the middle non-woven fabric layer in a multi-layer non-woven fabric, and the plant active coating particles and the fibers of the middle non-woven fabric layer are connected by an adhesive liquid. Then the middle non-woven fabric layer is stacked with other non-woven fabric layers to obtain a composite wet wipe substrate. S3, add cationic surfactant, moisturizer and auxiliary agent to water and mix to obtain compound sanitary solution; S4, the composite wet wipe substrate is immersed in the compound sanitary solution, the sanitary solution load is adjusted and the package is sealed to obtain press-type sanitary wipes.

2. The method for preparing press-type sanitary wipes according to claim 1, characterized in that, Step S1 includes: S1.1, Add the plant active components to deionized water, pre-disperse them to obtain a plant active dispersion, then add it to the wall material solution and stir and mix at 20-50℃ to obtain a coating precursor solution; S1.2, add the coating precursor liquid to the crosslinking agent to cause the wall material to undergo a crosslinking reaction in the plant active dispersion, separate the solid and liquid, wash to remove unreacted wall material and crosslinking agent, and dry to obtain plant active coated particles.

3. The method for preparing press-type sanitary wipes according to claim 2, characterized in that, The plant-active components include at least one of aloe vera leaf extract, chamomile extract, and honeysuckle extract. The wall material is calcium alginate gel wall material formed by cross-linking sodium alginate. The cross-linking agent includes calcium chloride or calcium lactate. The plant-active components are coated particles that are plant-active microcapsules with a particle size of 50-500 μm and a wall thickness of 5-50 μm.

4. The method for preparing press-type sanitary wipes according to claim 3, characterized in that, Step S2 includes: S2.1, a first nonwoven fabric layer, a second nonwoven fabric layer and a third nonwoven fabric layer are provided, the second nonwoven fabric layer is located between the first nonwoven fabric layer and the third nonwoven fabric layer, plant active microcapsules are dispersed in an adhesive liquid to obtain a mixture, the mixture is applied to the surface of the second nonwoven fabric layer, so that the plant active microcapsules enter the interior of the second nonwoven fabric layer with the adhesive liquid; S2.2, the first nonwoven fabric layer, the second nonwoven fabric layer and the third nonwoven fabric layer are stacked together, and the edges of the stacked area are sealed by hot pressing or adhesive bonding, so that the fiber gaps of the second nonwoven fabric layer serve as storage areas for accommodating plant active microcapsules. S2.3, the sealed nonwoven fabric is then rolled with a rolling pressure of 0.1 to 1 MPa to ensure that the plant active microcapsules are in full contact with the fibers of the second nonwoven fabric layer, and then cured with an adhesive liquid to form a connecting structure, thus obtaining a composite wet wipe substrate.

5. The method for preparing press-type sanitary wipes according to claim 4, characterized in that, The amount of plant-active microcapsules added is 4-20% of the mass of the nonwoven fabric, and the adhesive liquid is at least one of sodium alginate solution, sodium carboxymethyl cellulose solution, and polyvinyl alcohol solution, with a mass concentration of 0.5-2%.

6. The method for preparing press-type sanitary wipes according to claim 1, characterized in that, Step S3 includes: S3.1, Add the cationic surfactant to water and stir at 100-800 rpm for 10-60 minutes at 20-40℃ to fully dissolve the cationic surfactant and obtain a cationic surfactant solution; S3.2, add a humectant to the cationic active solution and continue stirring and mixing for 10-60 minutes, then add an auxiliary agent, stir, and obtain a mixture. Let it stand to remove bubbles, and then filter it through a 0.22-1μm filter membrane to remove undissolved particles, thus obtaining a compound sanitary solution.

7. The method for preparing press-type sanitary wipes according to claim 6, characterized in that, The cationic surfactant is at least one of benzalkonium chloride and cetylpyridinium chloride, the humectant is at least one of glycerin and propylene glycol, and the adjuvant includes at least one of chlorphenesin and vitamin E.

8. The method for preparing press-type sanitary wipes according to claim 1, characterized in that, Step S4 includes: S4.1, The composite wet wipe substrate is immersed in the compound sanitary solution, so that the compound sanitary solution penetrates along the gaps between the nonwoven fabric fibers and is loaded inside the nonwoven fabric; S4.2, the impregnated non-woven fabric is squeezed to distribute the sanitary liquid evenly, and the sanitary liquid load is adjusted by the degree of squeezing. The adjusted non-woven fabric is then sealed and packaged to obtain press-type sanitary wipes.

9. The method for preparing press-type sanitary wipes according to claim 8, characterized in that, In step S4.2, the extrusion treatment pressure is 0.01-0.5 MPa and the time is 1-30 s.

10. A type of press-type sanitary wipe, characterized in that, The press-type sanitary wipes are prepared by the method according to any one of claims 1-9, comprising: a multilayer nonwoven fabric substrate, plant active coating particles disposed inside the multilayer nonwoven fabric substrate, the plant active coating particles being connected to the fibers of the nonwoven fabric substrate by a connection structure formed by curing with an adhesive liquid, and a compound sanitary liquid loaded on the nonwoven fabric substrate.

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