A multifunctional sanitary article and its use

Abstract

This invention discloses a multifunctional hygiene product and its application. The hygiene product includes a surface layer and an absorbent layer; the surface layer is made of modified non-woven fabric with a core-sheath bicomponent fiber as the base material, and achieves negative ion wet-state responsive release through organic-inorganic layered hybridization and ultrasonic activation synergistic treatment, with a release amount >10,000 ions / cm³; the absorbent layer has a three-layer encapsulation structure, with a dust-free paper outer layer covering the mixed core, and a microporous PE breathable membrane at the bottom; the mixed core includes highly absorbent resin and functional core-sheath bicomponent ultra-short fibers. This invention achieves negative ion antibacterial properties, one-way moisture wicking and quick-drying, breathability and anti-backflow through structural design, with second-level liquid absorption and zero backflow, and a quick-drying surface effect. The hygiene product provided by this invention can effectively prevent skin inflammation caused by dampness and bacterial growth, and is suitable for use in sanitary napkins, panty liners, diapers, incontinence pads, disposable sanitary pants and other hygiene products.

Description

Technical Field

[0001] This invention relates to the application of sanitary dressings or absorbent pads, specifically to a multifunctional sanitary product with antibacterial, moisture-absorbing, moisture-wicking, anti-slip, and negative ion release properties, which can be used in sanitary napkins, panty liners, diapers, incontinence pads, disposable sanitary pants, etc. Background Technology

[0002] With the improvement of people's living standards and increased awareness of hygiene and health, the development of functional hygiene products such as sanitary napkins, panty liners, and diapers has received widespread attention. However, currently, functional hygiene products often add functional substances at the end, posing a potential risk of chemical substances leaching and migrating to the skin, which may be detrimental to human health with long-term use. For example, Chinese invention patent application CN112618168A discloses a nano-silver antibacterial sanitary napkin and its production method. The antibacterial liquid contains nano-silver and O-carboxymethyl chitosan, giving it excellent antibacterial ability, reducing the risk of infection for women, and providing protection for their physiological hygiene and health. The antibacterial liquid containing nano-silver materials is applied to the surface layer by impregnation. Chinese utility model patent with publication number CN219127072U discloses a diaper-type nursing pad with antibacterial and deodorizing properties, including a nursing pad body. The nursing pad body is composed of a skin-friendly layer, a first wet-strength paper, an absorbent core, a second wet-strength paper, and a bottom film. The absorbent core contains bactericidal and deodorizing agents. Although this solution solves the problem of antibacterial and deodorizing to a certain extent, the bactericidal and deodorizing agents are distributed in the absorbent core and may still leach out, causing allergies, etc. Moreover, the surface layer in contact with the skin may also breed bacteria, leading to the risk of bedsores.

[0003] Some non-soluble antibacterial technologies are slow to take effect, requiring 18 to 24 hours to become effective, which cannot meet the actual needs of disposable hygiene products.

[0004] In terms of moisture absorption and wicking, most products use a simple process of wrapping absorbent resin with dust-free paper. After absorbing moisture, they cannot quickly wick it away, causing a wet and uncomfortable feeling on the skin, which greatly affects the user's comfort.

[0005] Existing negative ion hygiene products mostly use mineral powder (such as tourmaline) to be directly added to the surface or absorbent layer. Existing antibacterial sanitary napkins also use impregnation to add antibacterial agents. Both of these technologies have two major drawbacks: First, there is a risk of leaching, as negative ions and antibacterial materials may migrate into the human body with bodily fluids, posing a biosafety risk with long-term use. Second, the timeliness is poor, as the release of negative ions depends on physical friction, and the release efficiency drops sharply in humid environments. Summary of the Invention

[0006] To address the shortcomings of existing hygiene products, the purpose of this invention is to provide a hygiene product and its applications that utilize a composite structure and through material innovation and functional synergy, offering multiple functions such as negative ion wet-state responsive release, antibacterial properties, high-efficiency moisture absorption and anti-backflow, and breathability and leak prevention.

[0007] The technical solution to achieve the purpose of this invention is: to provide a multifunctional hygiene product, which includes a surface layer, an absorbent layer and a bottom layer in sequence. The surface layer is a non-woven fabric made of functional core-sheath bicomponent short fibers, which actively releases negative ions when exposed to water. The absorbent layer has a wrapping structure, with a dust-free paper as the outer layer and wrapped around the hybrid core. The hybrid core includes a super absorbent resin and a functional sheath-core bicomponent ultra-short fiber. The bottom layer is a microporous PE breathable membrane; The functional sheath-core bicomponent fiber is prepared by the following method: paraffin-based silica phase change microcapsules are doped into a hydrophobic polymer as the sheath substrate, and multi-hydroxyl-modified inorganic nano-metal oxides are added to a hydrophilic polymer as the core substrate. Coaxial spinning and three-stage drawing processes are used to obtain sheath-core bicomponent primary filaments; then, they are cut to the required size to obtain functional sheath-core bicomponent short fibers and functional sheath-core bicomponent ultrashort fibers, respectively. The process conditions for the three-stage drawing process are as follows: drawing speed is 100-110 mpm, first drawing temperature is 50-60℃, and drawing ratio is 1.2-1.5 times; second drawing temperature is 75-85℃, and drawing ratio is 2.0-2.5 times; third drawing temperature is 40-45℃, and drawing ratio is 1.0-1.2 times. The surface nonwoven fabric is obtained by the following preparation method: the functional core-sheath bicomponent short fibers are made into hot air nonwoven fabric using a hot air process, and then subjected to dot matrix activation treatment in an ultrasonic device to obtain a nonwoven fabric made of functional core-sheath bicomponent short fibers that actively release negative ions when exposed to water.

[0008] The above-mentioned functional core-sheath bicomponent fiber nonwoven fabric is prepared by using a hot air process to make a hot air nonwoven fabric from core-sheath bicomponent short fibers, and then performing a dot matrix activation treatment in an ultrasonic device to obtain a core-sheath bicomponent fiber nonwoven fabric that actively releases negative ions when exposed to water.

[0009] In the multifunctional hygiene product of the present invention, the hydrophobic polymer in the leather substrate is selected from polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polylactic acid (PLA), or polyurethane (PU); the doping amount of the paraffin-based silica phase change microcapsules is 0.1% to 1%.

[0010] In the core substrate, the hydrophilic polymer is selected from terephthalic acid ester, diacetate, triacetate or polyamide; the multi-hydroxyl-modified inorganic nano-metal oxide is selected from one or more of hydroxyl-modified zinc oxide, hydroxyl-modified titanium oxide, hydroxyl-modified molybdenum oxide and hydroxyl-modified cerium oxide, and the doping amount is 0.1% to 1%.

[0011] In the above technical solution, the mass ratio of the sheath to the core of the functional sheath-core bicomponent fiber is 1:1 to 1:1.2, and the fiber diameter is 1.2 to 2.0D; the cutting length of the functional sheath-core bicomponent short fiber in the surface layer is 30 to 45 mm; and the length of the functional sheath-core bicomponent ultrashort fiber in the absorbent layer is 3 to 5 mm.

[0012] The multifunctional hygiene product of this invention is prepared by the following method: paraffin wax, tetraethyl orthosilicate, silane coupling agent, hexadecyltrimethylammonium bromide, and water are mixed in a mass ratio of 1:1:0.1:0.1:15-20. Ethanol is added while stirring, with the ethanol content in the entire mixture being 40-50% by mass. After complete dissolution, the temperature is raised to 60-70°C, and ammonia water is slowly added dropwise, with the ammonia water content in the entire mixture being 2-3% by mass. The reaction is continued for 6-8 hours, and the mixture is filtered to obtain paraffin-based silica phase change microcapsules with a particle size of 200-500 nm.

[0013] In the above technical solution, 95% concentration industrial ethanol can be used.

[0014] The molding process conditions for producing hot air nonwoven fabric using hot air technology are as follows: temperature 130-200℃, time 2-3 minutes, and machine speed 30-100m / min.

[0015] The aforementioned technology, as described by Tang Wanru, involves a nonwoven fabric that actively releases negative ions upon contact with water, with a basis weight of 20–60 g / m². Its negative ion release is ≥10,000 ions / cm³, its antibacterial rate is ≥99%, and its water absorption rate is more than 40 times its own weight.

[0016] This invention provides a multifunctional hygiene product, comprising a nonwoven fabric that actively releases negative ions upon contact with water, with a basis weight of 20–60 g / m². Its negative ion release is ≥10,000 ions / cm³, its antibacterial rate is ≥99%, and its water absorption rate is more than 40 times its own weight.

[0017] The technical solution of the present invention also includes the application of the multifunctional sanitary products mentioned above, using them as the main material of disposable sanitary products, including sanitary napkins, panty liners, diapers, diaper pads, and disposable sanitary pants.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The sanitary products provided by this invention utilize nanomaterials with different charge structures in the outer and core layers. Through coaxial spinning and stretching processes, the potential within the outer and core interface is constructed. Then, by utilizing the different expansion rates of the fiber outer and core substrates when exposed to water, negative ions are generated through water discharge. The surface non-woven fabric is ultrasonically activated to form a microporous structure, further enhancing the diffusion efficiency of negative ions and the surface quick-drying properties. No chemical post-treatment or external energy is required, and the negative ion generation rate is greater than 10,000 ions / square centimeter.

[0019] 2. The present invention employs a three-stage stretching process in the stretching equipment to control each process parameter, ensuring good core-sheath composite without separation and preventing partial core-sheath peeling. The resulting nonwoven fabric has the effect of actively releasing negative ions after contact with water.

[0020] 3. The sanitary products provided by this invention have the characteristics of second-level liquid absorption and zero backflow. The absorbent layer is made of water-absorbing resin and the core is made of ultra-short core fiber composite material. Liquid is quickly guided from the upper layer to the middle layer, achieving second-level liquid absorption and zero backflow, keeping the skin dry.

[0021] 4. The sanitary products provided by this invention use structurally stable core-sheath fibers, which avoids secondary pollution caused by the leaching of chemical additives, making them safe and environmentally friendly. Attached Figure Description

[0022] Figure 1 This is an electron microscope image of the cross-section of the bicomponent core-sheath fiber provided in Embodiment 1 of the present invention; Figure 2 This is an electron microscope image of the cross-section of the bicomponent core-sheath fiber provided in Comparative Example 1 of the present invention; Figure 3 A cross-sectional schematic diagram of the multifunctional sanitary product provided in Embodiment 1 of the present invention; wherein: 1. a heterogeneous fiber nonwoven fabric with a core and sheath; 2. ultrasonically activated micropores; 3. dust-free paper; 4. a hybrid core; 5. a breathable PE membrane; Figure 4 The moisture-wicking effect curve of the multifunctional sanitary product provided in Embodiment 1 of the present invention. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0025] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels. Example 1

[0026] This embodiment provides a multifunctional sanitary napkin, including a main body and wings; the main body includes an upper surface layer and an absorbent layer, the upper surface layer is a core-sheath fiber nonwoven fabric that actively releases negative ions upon contact with water, and the absorbent layer adopts a three-layer covering structure, the specific preparation method of which is as follows: 1. Preparation of nonwoven fabric with upper surface layer that automatically releases negative ions upon contact with water: Skin substrate: Polylactic acid (PLA), with 0.1% paraffin-based silica phase change microcapsules (300 nm particle size) added by mass percentage. Preparation of paraffin-based silica phase change microcapsules: Paraffin, tetraethyl orthosilicate, silane coupling agent, hexadecyltrimethylammonium bromide, and water were mixed in a mass ratio of 1:1:0.1:0.1:15. While stirring, 50% ethanol was added until all substances were completely dissolved. The mixture was heated to 65°C, and 2% ammonia was slowly added dropwise. The reaction continued for 6 hours. After filtration, paraffin-based silica phase change microcapsules with a particle size of 300 nm were obtained.

[0027] Core substrate: triacetate (CTA) with nano zinc oxide (ZnO) modified with 0.1% by weight of polyvinylpyrrolidone (PVP).

[0028] Spinning process: The sheath to core mass ratio is 1:1, using twin-screw extrusion; the spinning temperature is 175℃ for the sheath and 190℃ for the core; the drawing speed is 100mpm; the first drawing temperature is 50℃ with a drawing ratio of 1.2; the second drawing temperature is 80℃ with a drawing ratio of 2.2; and the third drawing temperature is 41℃ with a drawing ratio of 1.1. After drawing, the fiber diameter is 1.8D, resulting in a bicomponent sheath-core heterojunction fiber. The cut fiber length is 38mm.

[0029] See appendix Figure 1 The image shown is a cross-sectional electron microscope image of the bicomponent core-sheath heterojunction fiber provided in this embodiment, which clearly shows that the core-sheath interface is intact and without separation.

[0030] Fabrication process: The fabric is processed using a hot air process to produce a hot air nonwoven fabric with a weight of 25g / m².

[0031] Ultrasonic treatment process: Using ultrasonic welding equipment with embossed texture, the surface of nonwoven fabric is activated for 30 seconds at 30kHz and 550W to enhance the surface roughness of the fibers and improve the negative ion release performance.

[0032] 2. Absorbent Layer Preparation: A three-layer encapsulation structure design is adopted. The inner layer of the absorbent layer is a hybrid core composed of superabsorbent polymer (SAP) and the bicomponent core-sheath heterojunction ultrashort fibers prepared in this embodiment (mass ratio 70:30, ultrashort fiber length 3-5 mm). The basis weight of the hybrid core is 100-200 g / m³. 2 The outer layer of the sanitary napkin is made of 60g / m² clean paper, which is wrapped around the surface of the mixed core. This forms a three-layer structure with clean paper on the top and bottom and the mixed core in the middle. The bottom layer is a microporous PE breathable membrane (35g / m²), which improves the absorbency of the sanitary napkin and prevents backflow.

[0033] Preparation of the comparative example: The raw materials are basically the same as those in this example, except that the spinning process conditions are as follows: the mass ratio of the sheath to the core is 1:1, twin-screw extrusion; the spinning temperature is 175℃ for the sheath and 190℃ for the core; the drawing speed is 130mpm; the drawing temperature is 80℃; the drawing ratio is 4.8 times; and the fiber diameter after drawing is 1.8D, resulting in a bicomponent sheath-core heterojunction fiber with a cut fiber length of 38mm.

[0034] See appendix Figure 2 The electron microscope image of the cross-section of the bicomponent core-sheath heterojunction fiber provided for this comparative example clearly shows that the core-sheath interface is significantly separated.

[0035] See appendix Figure 3 This is a cross-sectional schematic diagram of the main body of the multifunctional sanitary napkin provided in this embodiment; the main body of the sanitary napkin includes a surface layer and an absorbent layer; the surface layer is a nonwoven fabric 1 with a core-sheath heterojunction fiber having a negative ion wet-state responsive release function and ultrasonically activated micropores 2 with an ultrasonic texture structure on its surface; the absorbent layer is a covered structure, with a mixed core 4 composed of superabsorbent polymer (SAP) and core-sheath ultra-short fibers as the inner layer, a dust-free paper 3 as the outer layer covering the mixed core, and a microporous PE breathable membrane 5 as the bottom layer.

[0036] The outer edge of the sanitary napkin features heat-pressed textured nonwoven fabric as three-dimensional waterproof wings. The texture depth is 0.2mm, with a density of 4 strips / edge and 8 pieces / cm. These waterproof wings are made of hydrophobic antibacterial heat-pressed nonwoven fabric, effectively preventing liquid leakage to the edges of the sanitary napkin. Environmentally friendly hot-melt adhesive positioning patches are attached to the reverse side of the wings and the bottom film of the sanitary napkin for easy attachment to underwear.

[0037] See appendix Figure 4 The graph shows the moisture-wicking effect of the multifunctional sanitary product provided in this embodiment. The results show that... Figure 4 As can be seen, after absorbing the liquid, the amount of liquid on the surface gradually increases, and the surface becomes dry after 60 seconds.

[0038] The performance of the product provided in this embodiment, the product of the comparative example, and the comparative product purchased from the market were tested according to the method in Table 1. The test results are shown in Table 2.

[0039] Table 1 Antibacterial rate (%) Quantitative antibacterial test method (shaking method or film application method) to test the inhibition rate of the material against Escherichia coli, Staphylococcus aureus and Candida albicans. GB15979-1995 Negative ion release (10,000 ions / cm³) The concentration of negative ions released by the material is measured in a closed environment using a negative ion detector. JC / T 2110-2012 Absorption ratio Vertical water absorption method: Measure the weight of liquid that the material can ultimately absorb (before overflow). / Breathability (s / 100ml) An air permeability tester measures the rate at which air passes through a material. Gurley Method Table 2 Escherichia coli inhibition rate (%) 99.9 81.5 85.3 Staphylococcus aureus inhibition rate (%) 99.9 88.2 75.6 Candida albicans inhibition rate (%) 99.5 60.8 47.9 Negative ion release (ions / cm³) 18800 1058 355 Absorption ratio 52 26 15 Breathability (s / 100ml) 130 105 98 As shown in Table 2, the comparative sample released relatively weak negative ions. This confirms the influence of the skin-core interface binding on negative ion release. Example 2

[0040] This embodiment provides a multifunctional sanitary mattress pad, including an upper surface layer and an absorbent layer. The upper surface layer is a non-woven fabric that automatically releases negative ions when exposed to water. The absorbent layer adopts a three-layer encapsulation structure design. The preparation steps and parameters are as follows: 1. Preparation of nonwoven fabric that automatically releases negative ions upon contact with water: Skin substrate: High-density polyethylene (HDPE) with 0.1% by mass of paraffin-based silica phase change microcapsules (particle size 300nm).

[0041] Core substrate: atmospheric pressure dyeable ethylene terephthalate copolyester (EDPET) with nano-titanium oxide (TiO2) modified with 0.1% by mass of polyvinylpyrrolidone (PVP).

[0042] Spinning process: Twin-screw extrusion, temperature 180℃ for the sheath and 200℃ for the core, drawing process is the same as in Example 1, fiber diameter after drawing is 1.5D, cutting length is 38mm, and sheath to core mass ratio is 1:1. Weaving process: Processed by hot air to a weight of 26g / m².

[0043] Ultrasonic processing technology: according to the technical solution in Example 1.

[0044] 2. Preparation of absorbent layer: The inner layer is a core of superabsorbent polymer (SAP) mixed with the above-mentioned core and sheath ultra-short fiber (80:20), covered with 60g / m² dust-free paper, and the bottom layer is a porous PE breathable membrane (35g / m²), which is used to improve the liquid absorption capacity of sanitary products while preventing backflow. Example 3

[0045] This embodiment provides a multifunctional sanitary pad, including an upper surface layer and an absorbent layer. The upper surface layer is made of non-woven fabric that automatically releases negative ions upon contact with water. The absorbent layer adopts a three-layer encapsulation structure design. The preparation steps and parameters are as follows: 1. Preparation of nonwoven fabric with upper surface layer that automatically releases negative ions upon contact with water: Skin substrate: High-density polyethylene (HDPE) with 0.1% by mass of paraffin-based silica phase change microcapsules (particle size 300nm).

[0046] Core substrate: polyamide (PA), nano zinc oxide (ZnO) modified with 0.05% by mass of polyvinylpyrrolidone (PVP) and nano molybdenum oxide (MoO3) modified with 0.05% by mass of silane coupling agent.

[0047] Spinning process: twin-screw extrusion, temperature of sheath 180℃, core 195℃, drawing speed 110mpm, first drawing temperature 50℃, drawing ratio 1.2 times, second drawing temperature 85℃, drawing ratio 2.3 times, third drawing temperature 41℃, drawing ratio 1.1 times, fiber diameter after stretching 1.5D, cutting length 38mm, sheath to core mass ratio 1:1.

[0048] Fabric weaving process: The fabric is processed using a hot air process to achieve a weight of 35g / m².

[0049] Ultrasonic treatment process: The surface of the nonwoven fabric is activated for 30 seconds at 30 kHz and 550 W on an ultrasonic welding machine with embossed texture to enhance the surface roughness of the fibers and improve the negative ion release performance.

[0050] 2. Absorbent Layer Preparation: A three-layer coating design is adopted. The inner layer is a core mixed with superabsorbent polymer (SAP) and the above-mentioned core-sheath ultra-short fiber (40:60), the middle layer is 60g / m² dust-free paper, and the outer layer is a microporous PE breathable membrane (25g / m²), which improves the liquid absorption capacity of sanitary products while preventing backflow.

[0051] 3. Hot melt adhesive positioning: Environmentally friendly hot melt adhesive positioning patches are attached to the bottom film of the sanitary pad body for easy fixation to the underwear.

[0052] This invention resolves the contradiction between moisture wicking and breathability in traditional hygiene products through a layered structure and synergistic material composition (moisture wicking-moisture absorption-hydrophobicity). By employing a modified fiber core-sheath directional loading process (adding different nano-oxides through separate channels) and ultrasonic activation, it achieves non-leaching antibacterial properties and a responsive release of negative ions in a moist state.

Claims

1. A multifunctional hygiene product, comprising a top layer, an absorbent layer, and a bottom layer, characterized in that: The surface layer is a nonwoven fabric made of functional core-sheath bicomponent short fibers, which actively releases negative ions when exposed to water; The absorbent layer has a wrapping structure, with a dust-free paper as the outer layer and wrapped around the hybrid core. The hybrid core includes a super absorbent resin and a functional sheath-core bicomponent ultra-short fiber. The bottom layer is a microporous PE breathable membrane; The functional sheath-core bicomponent fiber is prepared by the following method: paraffin-based silica phase change microcapsules are doped into a hydrophobic polymer as the sheath substrate, and multi-hydroxyl-modified inorganic nano-metal oxides are added to a hydrophilic polymer as the core substrate. Coaxial spinning and three-stage drawing processes are used to obtain sheath-core bicomponent primary filaments; then, they are cut to the required size to obtain functional sheath-core bicomponent short fibers and functional sheath-core bicomponent ultrashort fibers, respectively. The process conditions for the three-stage drawing process are as follows: drawing speed is 100-110 mpm, first drawing temperature is 50-60℃, and drawing ratio is 1.2-1.5 times; second drawing temperature is 75-85℃, and drawing ratio is 2.0-2.5 times; third drawing temperature is 40-45℃, and drawing ratio is 1.0-1.2 times. The surface nonwoven fabric is obtained by the following preparation method: the functional core-sheath bicomponent short fibers are made into hot air nonwoven fabric using a hot air process, and then subjected to dot matrix activation treatment in an ultrasonic device to obtain a nonwoven fabric made of functional core-sheath bicomponent short fibers that actively release negative ions when exposed to water.

2. The multifunctional hygiene product according to claim 1, characterized in that: In the skin substrate, the hydrophobic polymer is selected from polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polylactic acid (PLA), or polyurethane (PU); the doping amount of the paraffin-based silica phase change microcapsules is 0.1% to 1%.

3. The multifunctional hygiene product according to claim 1, characterized in that: In the core substrate, the hydrophilic polymer is selected from terephthalic acid ester, diacetate, triacetate or polyamide; the multi-hydroxyl-modified inorganic nano-metal oxide is selected from one or more of hydroxyl-modified zinc oxide, hydroxyl-modified titanium oxide, hydroxyl-modified molybdenum oxide and hydroxyl-modified cerium oxide, and the doping amount is 0.1% to 1%.

4. A multifunctional hygiene product according to claim 1, characterized in that: The functional sheath-core bicomponent fiber has a sheath-to-core mass ratio of 1:1 to 1:1.2 and a fiber diameter of 1.2 to 2.0D; the functional sheath-core bicomponent short fiber in the surface layer has a cutting length of 30 to 45 mm; and the functional sheath-core bicomponent ultrashort fiber in the absorbent layer has a length of 3 to 5 mm.

5. A multifunctional hygiene product according to claim 1, characterized in that: Paraffin-based silica phase change microcapsules were prepared by the following method: Paraffin, tetraethyl orthosilicate, silane coupling agent, hexadecyltrimethylammonium bromide, and water were mixed in a mass ratio of 1:1:0.1:0.1:15-20. Ethanol was added while stirring, with the ethanol content in the entire mixture being 40-50% by mass. After complete dissolution, the mixture was heated to 60-70°C, and ammonia was slowly added dropwise, with the ammonia content in the entire mixture being 2-3% by mass. The reaction was continued for 6-8 hours, and the mixture was filtered to obtain paraffin-based silica phase change microcapsules with a particle size of 200-500 nm.

6. In the above technical solution, 95% concentration industrial ethanol can be used.

7. The multifunctional hygiene product according to claim 1, characterized in that: The molding process conditions for producing hot air nonwoven fabric using hot air technology are as follows: temperature 130-200℃, time 2-3 minutes, and machine speed 30-100m / min.

8. A multifunctional hygiene product according to claim 1, characterized in that: The nonwoven fabric that actively releases negative ions upon contact with water has a basis weight of 20–60 g / m².

9. A multifunctional hygiene product according to claim 1, characterized in that: The negative ion release is ≥10,000 ions / cm³, the antibacterial rate is ≥99%, and the water absorption ratio is more than 40 times the weight of the sanitary product itself.

10. The application of the multifunctional hygiene product according to any one of claims 1 to 8, characterized in that: It is used as the main material for disposable sanitary products, such as sanitary napkins, panty liners, diapers, waterproof pads, or disposable sanitary pants.

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