Life care product with physical bacteriostatic effect

Abstract

The invention relates to the field of daily necessities, and discloses a life nursing article with a physical bacteriostatic effect, the life nursing article is a paper diaper or a sanitary napkin, the life nursing article is provided with a diversion layer, one side of the diversion layer facing the absorption side of the life nursing article is a hydrophobic surface, and the contact angle of the hydrophobic surface is 95-145 degrees. The diversion layer has a proper hydrophobic effect, can generate a physical adhesion effect on microorganisms, and can remove the microorganisms from skin, menstrual blood or excreta and lock the microorganisms on the surface of the material, so that the microorganisms cannot freely move or return to the surface of skin / mucosa, and after being locked in the life nursing material, the microorganisms can be prevented from falling off or falling off from the surface of the material. And when the daily nursing materials are replaced, the medical nursing material is safely discarded, so that the risks of infection, peculiar smell and stimulation caused by excessive propagation of microorganisms can be effectively reduced, and a very good bacteriostatic effect can be achieved.

Description

Technical Field

[0001] This invention relates to the field of daily necessities technology, and more specifically, to a personal care product with physical antibacterial properties. Background Technology

[0002] Currently available "antibacterial" or "bacteriostatic" personal care products (diapers and sanitary napkins), taking sanitary napkins as an example, mainly fall into two categories in terms of their technological approaches: Adding chemical antibacterial agents / medications: This is currently the most mainstream approach. Various chemical antibacterial agents (such as nano-silver, triclosan, chitosan, various plant extracts, etc.) or medicinal ingredients are added to the surface, core, or absorbent layer of the sanitary napkin to inhibit or kill microorganisms. These types of sanitary napkins have the following disadvantages: Safety risks: Long-term use may cause skin allergies, irritation, and even potential cytotoxicity. The long-term safety of some components (such as nano-silver) remains controversial in the academic community.

[0003] Antimicrobial resistance: The widespread use of antimicrobial agents may accelerate the development of antimicrobial resistance in environmental microorganisms.

[0004] Stability issues: The activity of antibacterial agents may decrease due to storage time, changes in ambient humidity and temperature, affecting the durability of their effects.

[0005] Ecological pollution: After disposal, chemical antibacterial agents may enter the environment and cause pollution.

[0006] Limited effectiveness: It mainly targets the inhibition of bacterial growth, and has limited effect on reducing existing odors and infection risks.

[0007] Physical structure optimization: Some products indirectly reduce the microbial growth environment by changing the physical structure of materials (such as increasing air permeability and using a denser surface to reduce backflow), but they do not have the ability to actively intervene in microorganisms.

[0008] The core pain points of existing technologies are: reliance on "killing" mechanisms, accompanied by safety and ecological risks from chemical additives; and a lack of a safe, additive-free, and physical means of microbial intervention.

[0009] In view of this, the present invention is proposed. Summary of the Invention

[0010] The purpose of this invention is to provide a personal care product with physical antibacterial properties, aiming to improve the problems existing in the prior art.

[0011] This invention is implemented as follows: In a first aspect, the present invention provides a personal care product with physical antibacterial effect. The personal care product includes diapers or sanitary napkins. The personal care product has a diversion layer, and the side of the diversion layer facing the absorbent side of the personal care product is a hydrophobic surface with a contact angle of 95~145°.

[0012] In an optional implementation, the flow-guiding layer is made of hydrophobic fibers; Alternatively, the flow-guiding layer can be obtained by surface hydrophobic treatment of the substrate; Alternatively, the material of the flow-guiding layer is a natural biodegradable hydrophobic material; optionally, the natural biodegradable hydrophobic material is at least one of coconut shell fiber and pine fiber.

[0013] In an optional embodiment, the substrate material is a biodegradable material.

[0014] In an optional embodiment, the biodegradable material is cellulose acetate.

[0015] In optional embodiments, the surface hydrophobic treatment methods include: The substrate is immersed in a modified solution containing a hydrophobic agent, then removed and heated to cure to obtain the flow-guiding layer. Alternatively, a modified solution containing a hydrophobic agent can be sprayed onto the surface of the substrate and then heated to cure to obtain the flow-guiding layer. The hydrophobic agent is selected from at least one of hexadecyltrimethoxysilane and polydimethylsiloxane.

[0016] In an optional embodiment, when the hydrophobic agent dissolved in the modified solution includes hexadecyltrimethoxysilane, hydrogen chloride is also dissolved in the modified solution. The solvent in the modified solution is anhydrous ethanol, the mass ratio of hexadecyltrimethoxysilane to anhydrous ethanol is 2.5~3.5:100, and the mass ratio of hydrogen chloride to anhydrous ethanol is 0.5~1:100. Optionally, the heating curing conditions are 80~120℃ for 5~15 min.

[0017] In an optional embodiment, when the hydrophobic agent dissolved in the modified solution includes polydimethylsiloxane, the modified solution also contains a curing agent. The solvent of the modified solution is n-hexane, the ratio of polydimethylsiloxane to n-hexane is 8-12 g:90 mL, and the ratio of curing agent to n-hexane is 0.8-1.2 g:90 mL. Optionally, the heating curing conditions are 80-120°C for 5-30 min. Optionally, the curing agent is Sylgard 184. Optionally, before heat curing, the substrate may be extruded to remove excess modified solution.

[0018] In an optional embodiment, the hydrophobic fiber is at least one of PMP fiber and fluorinated polypropylene fiber.

[0019] In an optional embodiment, the flow guide layer has macroscopic through holes with a diameter of 1-8 mm and a porosity of 5-30%.

[0020] In an optional embodiment, the flow-guiding layer has microfiber channels with an equivalent pore size of 5-50 µm and a porosity of 20-70%.

[0021] In an optional implementation, the contact angle of the hydrophobic surface is 100~135°.

[0022] In an optional embodiment, the personal care product includes a leak-proof bottom layer, an absorbent core, a diversion layer, and a top layer arranged in sequence, wherein the side of the diversion layer facing the top layer is hydrophobic.

[0023] The present invention has the following beneficial effects: This invention provides a diversion layer for personal care products that can physically adhere to microorganisms. This effectively "removes" microorganisms from the skin, menstrual blood, or excrement and "locks" them onto the material surface, preventing them from moving freely or returning to the skin / mucous membrane surface. Once locked within the personal care product, it can be safely discarded when the product is replaced. This effectively reduces the risk of infection, odor, and irritation caused by excessive microbial growth, providing a good antibacterial effect. Therefore, this invention selects a material with a surface contact angle of 95°-145° as the diversion layer to achieve a good antibacterial effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram of the sanitary napkin provided in Example 1. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0028] The present invention provides a personal care product with antibacterial function, which includes diapers or sanitary napkins. The personal care product has a diversion layer, and the side of the diversion layer facing the absorbent side (the side in contact with the human body) of the personal care product is a hydrophobic surface with a contact angle of 95~145°.

[0029] According to the Young's equation γL cos θ=γS -γSL, there is a correlation between surface free energy and contact angle. Contact angle is the most intuitive way to characterize hydrophilicity / hydrophobicity. When the contact angle of a material is small, it exhibits hydrophilicity; when the contact angle is large, it exhibits hydrophobicity. A contact angle less than 90° is hydrophilic, greater than 90° is hydrophobic, and greater than 150° is superhydrophobic.

[0030] Because the phospholipid bilayer structure of microbial (bacteria and fungi) cell membranes (containing lipids, hydrophobic proteins, etc.) has the hydrophilic head facing inward and the hydrophobic tail facing outward, the surfaces of bacteria and fungi are generally weakly hydrophobic. Research has found that when the material's contact angle is between 95° and 145°, the surface free energy of the material is close to that of bacteria and fungi. Therefore, this hydrophobic material can physically adhere to microorganisms, effectively "removing" and "locking" them from the skin, menstrual blood, or excrement onto the material's surface. This prevents microorganisms from moving freely or returning to the skin / mucous membrane surface. Once locked in personal care products, they can be safely discarded when the products are replaced, effectively reducing the risk of infection, odor, and irritation caused by excessive microbial growth, thus providing excellent antibacterial effects. Excessively hydrophilic surfaces (contact angle < 90°) form a dense hydration layer, hindering direct contact between bacteria and the material. Excessively hydrophobic surfaces (contact angle > 145°) trap air, creating an air cushion that reduces bacterial contact. Both excessively hydrophilic and hydrophobic surfaces gradually increase the surface energy difference between the material and bacteria, reducing bacterial adhesion efficiency. Therefore, this invention selects a material with a surface contact angle of 95°~145° as the guiding layer, achieving excellent antibacterial effects.

[0031] Optionally, the contact angle of the hydrophobic surface is 95°, 100°, 110°, 120°, 130°, 140°, or 145°, or any value between any two of the above. Preferably, to achieve a better antibacterial effect, the contact angle is 100~135°, more preferably 100~130° or 105~135°.

[0032] Specifically, the personal care products provided in this embodiment of the invention include a leak-proof bottom layer, an absorbent core, a diversion layer and a top layer arranged in sequence, wherein the side of the diversion layer facing the top layer is a hydrophobic surface.

[0033] Specifically, (1) the diversion layer is made of hydrophobic fibers that have hydrophobic properties. In this case, the diversion layer as a whole has the same hydrophobicity, and its two opposite sides are hydrophobic surfaces. When manufacturing sanitary napkins, either side can face the absorbent side; Alternatively, (2) the guide layer is obtained by surface hydrophobic treatment of the substrate. If both sides of the substrate are hydrophobically treated, then both sides are hydrophobic surfaces, and either side can face the absorbent side when manufacturing sanitary napkins; if only one side of the substrate is hydrophobically treated, then the hydrophobically treated side is the hydrophobic surface, and the hydrophobic surface should face the absorbent side when manufacturing sanitary napkins. Alternatively, (3) the material of the diversion layer is a natural biodegradable hydrophobic material. In this case, the entire diversion layer has the same hydrophobicity, and both of its opposite sides are hydrophobic surfaces. When manufacturing sanitary napkins, either side can face the absorbent side.

[0034] Optionally, when the flow-guiding layer is made of hydrophobic fibers with hydrophobic properties, the hydrophobic fibers are at least one of PMP (poly-4-methyl-1-pentene) fibers and fluorinated polypropylene fibers.

[0035] Alternatively, the flow guide layer may be obtained by surface hydrophobic treatment of the substrate.

[0036] Surface hydrophobic treatment methods include: The substrate is immersed in a modified solution containing a hydrophobic agent, then removed and heated to cure to obtain the flow-guiding layer. Alternatively, a modified solution containing a hydrophobic agent can be sprayed onto the surface of the substrate and then heated to cure to obtain the flow-guiding layer. The hydrophobic agent is selected from at least one of hexadecyltrimethoxysilane (HDTMS) and polydimethylsiloxane (PDMS).

[0037] The substrate can be any conventional material that is harmless to the human body and has a certain mechanical strength, preferably a biodegradable material, and further, the biodegradable material is cellulose acetate.

[0038] Optionally, when the hydrophobic agent dissolved in the modified solution includes hexadecyltrimethoxysilane, hydrogen chloride is also dissolved in the modified solution. The solvent in the modified solution is anhydrous ethanol, and the mass ratio of hexadecyltrimethoxysilane to anhydrous ethanol is 2.5~3.5:100 (e.g., 2.5:100, 3:100 or 3.5:100), and the mass ratio of hydrogen chloride to anhydrous ethanol is 0.5~1:100 (e.g., 0.5:100, 0.8:100 or 1:100).

[0039] Furthermore, the heat curing conditions are 80~120℃ (e.g., 80℃, 100℃ or 120℃) for 5~15 min (e.g., 5 min, 10 min or 15 min).

[0040] Optionally, when the hydrophobic agent dissolved in the modification solution includes polydimethylsiloxane, the modification solution also contains a curing agent. The solvent of the modification solution is n-hexane, and the ratio of polydimethylsiloxane to n-hexane is 8-12 g:90 mL (e.g., 8 g:90 mL, 10 g:90 mL, or 12 g:90 mL), and the ratio of curing agent to n-hexane is 0.8-1.2 g:90 mL (e.g., 0.8 g:90 mL, 1 g:90 mL, or 1.2 g:90 mL).

[0041] Further, the heat curing conditions are 80~120℃ (e.g., 80℃, 100℃ or 120℃) for 5~15 min (e.g., 5 min, 10 min or 15 min); optionally, the curing agent is Sylgard184.

[0042] When the modification method involves spraying a modified solution containing a hydrophobic agent onto the surface of a substrate and then heating and curing it to obtain a flow-guiding layer, if a large amount of the modified solution is sprayed and both sides of the substrate are impregnated, the two opposite sides of the flow-guiding layer obtained after the modification treatment will be hydrophobic. If a small amount of solution is sprayed and only enough is sprayed to modify one side, the flow-guiding layer obtained will only have one side that is hydrophobic.

[0043] Preferably, to avoid unnecessary waste of raw materials and to ensure better comfort when the resulting flow-through layer is applied to sanitary napkins or diapers, the substrate is extruded before heat curing to remove excess modified solution. Optionally, when the flow-through layer is a natural biodegradable hydrophobic material, the natural biodegradable hydrophobic material may be at least one of coconut shell fiber and pine fiber.

[0044] Optionally, the flow guide layer has macroscopic through holes with a diameter of 1 to 10 mm (e.g., 1 mm, 2 mm, 5 mm, 8 mm or 10 mm) and a porosity of 5 to 30% (e.g., 5%, 10%, 15%, 20%, 25% or 30%).

[0045] Optionally, the flow-guiding layer has microfiber channels with an equivalent pore size of 5~50µm and a porosity of 20~80%.

[0046] Utilizing a synergistic "hydrophobic-porous" mechanism, menstrual blood or excrement can be vertically guided within 1 second. The hydrophobic surface adheres to microorganisms in menstrual blood or excrement through hydrophobic interactions. When the main component of the absorbent core is SAP gel, it can also inhibit SAP gel back-crawling, thereby achieving a quadruple balance of "rapid penetration - adhesion of microorganisms - no back-flow - high air permeability".

[0047] Taking sanitary napkins as an example, the differences between the sanitary napkins provided by this invention and those using existing antibacterial technologies are shown in Table 1: Table 1 Comparison of Existing Antibacterial Sanitary Napkins with the Sanitary Napkins in This Case

[0048] The present invention will now be described in conjunction with several embodiments and comparative examples.

[0049] Example 1 like Figure 1 As shown, a sanitary napkin is provided, the structure of which includes a leak-proof bottom layer, an absorbent core, a diversion layer and a top layer arranged sequentially.

[0050] The flow guide layer is made of PMP fiber layer, with a contact angle of 120° on the side facing the surface layer. It has macroscopic through holes with a diameter of 5mm and a porosity of 20%, as well as microscopic fiber channels with a diameter between 5 and 50µm and a porosity of 50%.

[0051] The absorbent core is filled with SAP gel.

[0052] Example 2 This embodiment is basically the same as Embodiment 1, except that: the guide layer is obtained by surface hydrophobic treatment of the substrate, and the material of the substrate is cellulose acetate. The hydrophobic treatment is performed by immersing the substrate in a modified solution containing hexadecyltrimethoxysilane, removing it, rolling to squeeze out excess liquid, and then curing it at 120°C for 5 minutes. The modified solution contains anhydrous ethanol as a solvent and hydrogen chloride as a catalyst, wherein the mass ratio of hexadecyltrimethoxysilane to anhydrous ethanol is 3:100, and the mass ratio of hydrogen chloride to anhydrous ethanol is 0.8:100.

[0053] The flow guide layer has a contact angle of 115° and features macroscopic through-holes with a diameter of 1 mm and a porosity of 5%. It also has microscopic fiber channels with a diameter between 5 and 50 µm and a porosity of 80%.

[0054] Example 3 This embodiment is basically the same as Embodiment 1, except that: the material of the flow guide layer is a coconut shell fiber layer, the contact angle of the side facing the surface layer is 105°, it has macroscopic straight holes with a diameter of 10mm and a porosity of 30%, and also has microscopic fiber channels with a diameter between 5 and 50µm and a porosity of 20%.

[0055] Example 4 This embodiment is basically the same as Embodiment 1, except that the material of the flow guiding layer is fluorinated polypropylene nonwoven fabric, and the contact angle of the side facing the surface layer is 135°.

[0056] Example 5 This embodiment is basically the same as embodiment 3, except that the material of the flow guide layer is pine fiber, and the contact angle of the side facing the surface layer is 95°.

[0057] Example 6 This embodiment is basically the same as Example 2, except that the modified solution is a solution containing polydimethylsiloxane (molecular weight of 7000~10000 Da); The method for hydrophobic treatment is as follows: The substrate was immersed in a modified solution containing hexadecyltrimethoxysilane, removed, and then rolled to expel excess liquid. It was then cured at 120°C for 5 minutes. The modified solution also contained the curing agent Sylgard 184 and the solvent n-hexane; the ratio of polydimethylsiloxane to n-hexane was 10 g:90 mL, and the ratio of curing agent to n-hexane was 1 g:90 mL.

[0058] The contact angle of the surface layer of the flow guide layer after treatment is 145°.

[0059] Comparative Example 1 This comparative example is basically the same as Example 1, except that the material of the flow guide layer is polypropylene fiber, and the contact angle of the side facing the surface layer is 85°.

[0060] Comparative Example 2 This comparative example is basically the same as Example 1, except that the material of the flow guide layer is PTFE material, and the contact angle of the side facing the surface layer is 150°.

[0061] Experiment 1 Microbial challenge test of blood-simulated fluid (refer to ISO 18593:2018 "Microbiology of food and animal feed - Surface sampling techniques"): 1. Materials and Preparation of Bacterial Suspension Menstrual blood simulation solution: 10 mL of fresh anticoagulated pig blood (heparin sodium anticoagulation, final concentration 10 IU / mL), pH 7.2±0.2; Pathogen suspension: Staphylococcus aureus (ATCC 6538): 1 mL of bacterial suspension, concentration 1×10⁻⁶ 6 ~5×10 6 CFU / mL (prepared with physiological saline, McFarland turbidity 0.5±0.05); Candida albicans (ATCC 10231): 1 mL bacterial suspension, concentration 1×10 6 ~5×10 6 CFU / mL (prepared with physiological saline, verified by hemocytometer); Mixed challenge solution: Add the above bacterial suspension to pig blood, vortex to mix, final volume 12 mL (bacterial count 8.3 × 10⁻⁶). 4 ~4.2×10 5 (CFU / mL).

[0062] 2. Sample processing and inoculation Sanitary napkin samples: Cut a 5 cm × 5 cm standard sample (including the top layer, absorbent core, and bottom layer), and sterilize with ultraviolet light for 30 min (15 min on each side); Inoculation amount: Add 1.0 mL ± 0.1 mL of mixed challenge solution to each sample surface and spread evenly (using a sterile L-shaped glass rod); Control group: Positive control: Inoculate 1 mL of the mixed challenge solution onto a sterile stainless steel sheet (same size), and verify the recovery rate ≥70%; Negative control: Uninoculated sterile sanitary napkins were used to detect background bacteria.

[0063] 3. Cultivation and Sampling Time Points Cultivation conditions: 37°C±1°C, relative humidity 90%±5%, protected from light.

[0064] Sampling time: Surface microorganisms were recovered 2 h±5 min and 12 h±10 min after inoculation.

[0065] 4. Surface microbial recovery (ISO 18593 method) Sampling tool: Sterile cotton swab (polyester fiber tip, moistened with 0.1% peptone water).

[0066] Sampling steps: The cotton swab was used to wipe the entire sample surface at a 30° angle using a cross-scribing method (pressure approximately 0.3 N / cm², speed 2 cm / s). Cut the cotton swab tip into a 9 mL test tube containing peptone water, vortex for 30 s, and sonicate for 1 min (40 kHz).

[0067] 10x series dilution to 10 -3 Take 100 μL and spread it on: Baird-Parker agar (Staphylococcus aureus, cultured at 37°C for 24-48 h); Sabouraud dextrose agar (SDA) (Candida albicans, cultured at 25°C for 48-72 h); Counting: Select plates with 30–300 colonies and calculate CFU / sample (recovery rate must be ≥50%, otherwise repeat the test).

[0068] 5. Data Recording and Reporting The results indicate that: Viable bacterial count (CFU / mL) = (average colony count × dilution factor × 10) / recovery volume correction factor (0.9, due to loss due to swab adsorption).

[0069] .

[0070] Experiment 2 Antibacterial test of the flow layer Based on JIS L 1902:2015 "Test Methods for Antibacterial Properties of Textiles", the "bacterial liquid absorption method" was used to quantitatively evaluate the antibacterial properties of the flow-guiding layer nonwoven fabric.

[0071] The test bacteria were a 1:1 mixed bacterial suspension of Candida albicans (ATCC 10231) and Staphylococcus aureus (ATCC 6538) to simulate the mixed microecological pollution commonly seen during women's menstrual period.

[0072] 1. Test bacteria and preparation of bacterial suspension 1.1 Test bacteria Candida albicans (ATCC 10231) Staphylococcus aureus (ATCC 6538) Activation and Cultivation The preserved strain was inoculated onto Sabouraud dextrose agar (SDA) slant and incubated at 30 °C for 48 h to obtain the second generation; Transfer to nutrient agar (NA) slant (bacteria) or SDA slant (yeast), incubate at 35 °C for 24 h to obtain 18-24 h fresh third-generation cultures.

[0073] 1.3 Preparation of bacterial suspension 1.3.1 Wash the bacterial colony with 0.03 mol / L PBS (pH 7.2) and vortex to mix. 1.3.2 Adjusted to 1×10 7 After CFU / mL, mix at a 1:1 (v / v) ratio to obtain a mixed working suspension (final concentration 5×10⁻⁶). 6 –1×10 7 (CFU / mL). The bacterial suspension should be used within 1 hour.

[0074] 2. Sample and Control 2.1 Sample 2.1.1 Cut 0.40 g ± 0.05 g (approximately 1.8 cm × 1.8 cm) of the flow guide layer, with a thickness ≤ 2 mm; sterilize by high-pressure steam at 121 °C for 15 min, then dry at 60 °C and cool in a desiccator for later use.

[0075] 2.1.2 Control fabric: Fabric of the same material and specifications as the sample but without any antibacterial treatment, used as standard control sample (C).

[0076] 3. Experimental Procedure (Bacterial Fluid Absorption Method) 3.1 Vaccination Add 0.20 mL of mixed bacterial suspension evenly to the surface of the sample (T) and control cloth (C) to ensure complete absorption of the bacterial solution; immediately transfer to a sterile petri dish, slightly open the lid, and incubate at 30°C and 90%RH for 2 h ± 10 min to allow the bacteria to fully contact the fibers.

[0077] 3.2 Cultivation Add 20 mL of 1 / 20 nutrient broth (preheated to 30 °C) to each petri dish to completely submerge the sample; seal and incubate at 30 °C for 2 h and 12 h respectively to simulate the actual temperature and humidity conditions.

[0078] 3.3 Elution and Counting 3.3.1 Immediately after the culture is complete, add 20 mL of neutralizing agent (0.1% lecithin + 3% Tween 80PBS) to the dish, for a total volume of 40 mL; 3.3.2 Use sterile forceps to repeatedly squeeze the sample for 30 seconds to fully elute it; 3.3.3 Take 1 mL of eluent and prepare 10... -1 ~10 -3 Serial dilution, poured separately: Nutrient agar (bacteria): 35 °C 48 h; Sabouraud agar (yeast): 25 °C 72 h; 3.3.4 Count and convert to CFU / dip; take the average value for each dilution (2 dishes).

[0079] 4. Calculation 4.1 Microbial adhesion amount (A): ; in: C — Colony count (CFU / mL) after incubation on control cloth; T — Colony count (CFU / mL) after sample incubation.

[0080] Record the test results in Table 1.

[0081] Table 1. Test results for each embodiment and comparative example.

[0082] As shown in Table 1, the absorbent layer of the sanitary napkins provided in the various embodiments of the present invention exhibits significantly better antibacterial properties. When pig blood containing a mixture of Staphylococcus aureus and Candida albicans is added to the surface, the microorganisms penetrate into the absorbent layer along with the pig blood and undergo physical adhesion. In Examples 1-6, the adhesion amount was 58%-95% after 2-12 hours. In Comparative Examples 1-2, the adhesion amount was 32%-48% after 2-12 hours, which was lower than that in Examples 1-6.

[0083] Directly comparing the antibacterial effect of the flow-guiding layer, the antibacterial rate of Examples 1-6 was 81%-99% after 2-12 hours, while the antibacterial rate of Comparative Examples 1-2 was 40-58% after 2-12 hours, which was lower than that of Examples 1-6.

[0084] Comparing Comparative Example 1 with Example 1, Comparative Example 1 has a significantly worse antibacterial effect due to its poor hydrophobicity. Comparing Comparative Example 2 with each of the examples, Comparative Example 2 has a poorer antibacterial effect. This shows that although a hydrophobic material is used as the diversion layer, excessive hydrophobicity can trap air and form an air cushion, reducing bacterial contact and thus reducing the antibacterial effect of the sanitary napkin.

[0085] In summary, the personal care products provided by the embodiments of the present invention have the following characteristics: (1) Revolutionary safety improvement: The zero-additive feature fundamentally eliminates consumers' concerns about skin irritation, allergies, and long-term toxicity that chemical additives may cause. It is especially suitable for sensitive skin, pregnant women, and users who have concerns about chemical additives.

[0086] (2) There is no risk of drug resistance, which is in line with the global public health initiative to “reduce the use of antimicrobial agents”.

[0087] (3) Superior microbial management strategy: "Removal" is better than "In-situ killing": Physically "removing" microorganisms from the fragile private area is gentler and more thorough than chemically killing them in their original location. This avoids problems such as the release of endotoxins that may occur during the killing process.

[0088] (4) Broad spectrum: It is not targeted at any specific species and may be effective against Gram-positive bacteria, Gram-negative bacteria and fungi, providing more comprehensive protection.

[0089] (5) Significant environmental benefits: Sanitary napkins are a major source of environmental pollution after disposal. This technology does not contain any biocides, eliminating secondary pollution of soil and water by chemical substances. It is a green and environmentally friendly solution that can enhance the brand's social responsibility image.

[0090] (6) Stable and reliable efficacy: Since the function originates from the physical properties of the material itself rather than chemical activity, its microbial adhesion ability remains stable throughout the product’s shelf life and expiration period and will not be diminished by storage conditions, providing predictable and verifiable efficacy.

[0091] (7) Differentiated competitive advantages in the market: In the context of the general reliance on chemical additives in the "antibacterial" sanitary napkin market, this technology provides a new, safe and scientific physical solution, which can form a strong technical barrier and a unique market selling point, and meet the upgrading needs of high-end, healthy and environmentally friendly consumer groups.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A life care product having a physical antibacterial effect, the life care product including a paper diaper or a sanitary napkin, characterized by, The life care product has a flow guide layer, one side of the flow guide layer facing the absorption side of the life care product is a hydrophobic surface, and the contact angle of the hydrophobic surface is 95-145°.

2. The life care product according to claim 1, characterized in that The flow guide layer is made of hydrophobic fibers. Alternatively, the flow guide layer is obtained by surface hydrophobic treatment of a substrate. Alternatively, the material of the flow guide layer is a natural degradable hydrophobic material; optionally, the natural degradable hydrophobic material is at least one of coconut shell fiber and pine wood fiber.

3. The life care product according to claim 2, characterized in that The material of the substrate is a degradable material. Optionally, the degradable material is acetate fiber.

4. The life care product according to claim 2, characterized in that The surface hydrophobic treatment method comprises: immersing the substrate in a modified solution containing a hydrophobic agent, taking out the substrate, and heating and curing to obtain the flow guide layer; or spraying a modified solution containing a hydrophobic agent onto the surface of the substrate, and heating and curing to obtain the flow guide layer. The hydrophobic agent is selected from at least one of hexadecyl trimethoxysilane and polydimethylsiloxane.

5. The hygiene article according to claim 4, characterized in that When the hydrophobic agent dissolved in the modified solution comprises hexadecyl trimethoxysilane, hydrogen chloride is also dissolved in the modified solution, the solvent in the modified solution is anhydrous ethanol, the mass ratio of hexadecyl trimethoxysilane to anhydrous ethanol is 2.5-3.5:100, and the mass ratio of hydrogen chloride to the anhydrous ethanol is 0.5-1:100; optionally, the heating and curing conditions are 80-120°C for 5-15 min; When the hydrophobic agent dissolved in the modified solution comprises polydimethylsiloxane, a curing agent is also dissolved in the modified solution, the solvent in the modified solution is n-hexane, the use amount ratio of polydimethylsiloxane to n-hexane is 8-12 g:90 mL, and the use amount ratio of the curing agent to the n-hexane is 0.8-1.2 g:90 mL; optionally, the heating and curing conditions are 80-120°C for 5-30 min; optionally, the curing agent is Sylgard 184; Optionally, before heating and curing, the substrate is also subjected to extrusion to squeeze out excess modified solution.

6. The personal care product of claim 2, wherein, The hydrophobic fibers are at least one of PMP fibers and fluorinated polypropylene fibers.

7. The personal care product of claim 1, wherein, The flow guide layer has macroscopic straight-through holes with a pore size of 1-8 mm and a porosity of 5-30%.

8. The personal care product of claim 1, wherein, The flow guide layer has microscopic fiber channels with an equivalent pore size of 5-50 µm and a porosity of 20-70%.

9. The personal care product of claim 1, wherein, The contact angle of the hydrophobic surface is 100-135°.

10. The hygiene article according to any of claims 1 to 9, characterized in that The life care product comprises, in sequence, a leakage-proof bottom layer, an absorption core, the flow guide layer, and a surface layer, and one side of the flow guide layer facing the surface layer is a hydrophobic surface.

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