Conductive film composite material and preparation method thereof, and application of conductive film composite material in micro-current beauty equipment

Abstract

The invention relates to a conductive film composite material and a preparation method thereof, and application of the conductive film composite material in micro-current beauty equipment, and relates to the technical field of conductive films, the conductive film composite material comprises the following components by weight: 10-20wt% of polyvinyl alcohol; 5 to 15 wt% of a humectant; 1-5 wt% of a conductive component; 1-5 wt% of a functional component; and the balance of water. According to the conductive film composite material, the polyvinyl alcohol, the humectant, the conductive component and the functional component are reasonably proportioned, so that the conductivity, the biocompatibility, the comfort and the durability are improved; the conductive component ensures high-efficiency conduction of micro-current and meets the requirement of beauty equipment on current; polyvinyl alcohol provides structure and flexibility for the film and reduces skin irritation; the humectant makes the film more flexible, improves the comfort, increases the durability, and reduces cracks and aging; functional components such as moisturizing and antibiosis can enhance the skin care effect of the film and protect the skin health; the composite material provides comfortable, safe and lasting use experience, and meets the requirements of micro-current beauty equipment.

Description

Technical Field

[0001] This application relates to the field of conductive film technology, and in particular to a conductive film composite material, its preparation method, and its application in microcurrent beauty devices. Background Technology

[0002] With the increasing demand for beauty and anti-aging products, microcurrent technology in beauty devices has rapidly developed in the market. Microcurrent beauty instruments stimulate subcutaneous muscles with weak electrical currents, mimicking the bioelectrical activity of cells, enhancing facial muscle energy production (ATP), promoting collagen production, improving blood circulation, and thus increasing skin firmness to achieve anti-aging, wrinkle reduction, and lifting effects. This technology has become a common method for improving loose and sagging skin.

[0003] In microcurrent beauty devices, the conductive membrane, as a core component, plays a crucial role. It is responsible for transmitting microcurrents, ensuring stable current conduction, and adhering closely to the skin, directly impacting the device's effectiveness and user experience. The conductive membrane has a wide range of applications in microcurrent wearable beauty devices, covering areas such as facial lifting, eye care, and neck care. For example, facial tightening devices and beauty masks transmit microcurrents through the conductive membrane to stimulate facial muscles and skin, helping to lift facial contours and reduce wrinkles; microcurrent eye masks act on the skin around the eyes through the conductive membrane, helping to alleviate eye bags, dark circles, and fine lines; neck tightening devices transmit microcurrents through the conductive membrane to improve neck sagging and wrinkles. Simultaneously, some multifunctional beauty devices combine microcurrents with other beauty technologies, such as radio frequency and red light, achieving multiple functions through the conductive membrane.

[0004] However, despite the crucial role of conductive films in these devices, practical applications still face several technical challenges. Many existing conductive film materials suffer from poor conductivity, poor biocompatibility, and poor comfort. For example, some materials have insufficient conductivity, resulting in low microcurrent transmission efficiency and affecting their skin-care effects; some materials may trigger skin allergies or irritation, causing discomfort and even muscle stiffness; furthermore, existing materials are not very comfortable because excessive rigidity or weight affects the user experience, and insufficient material adhesion can lead to uneven current distribution, thus affecting the cosmetic effect; simultaneously, some materials can only be enhanced with the application of gels or other auxiliary materials, limiting the product's convenience and versatility.

[0005] Therefore, developing a conductive film material with high conductivity, biocompatibility, comfort, and durability has become an urgent problem for the industry. Summary of the Invention

[0006] In order to improve the conductivity, biocompatibility, comfort and durability of conductive films in microcurrent beauty devices, this application provides a conductive film composite material, its preparation method and its application in microcurrent beauty devices.

[0007] A conductive film composite material is composed of the following components in the indicated weight ratios: Polyvinyl alcohol: 10-20 wt% Moisturizer: 5-15 wt% Conductive component: 1-5 wt% Functional ingredients: 1-5 wt% The remainder is water.

[0008] By adopting the above technical solution, this conductive film composite material achieves improved conductivity, biocompatibility, comfort, and durability through a reasonable ratio of polyvinyl alcohol, moisturizer, conductive components, and functional components. The conductive components ensure that the microcurrent can be conducted efficiently and stably, meeting the current requirements of beauty devices. Polyvinyl alcohol provides the film with good structure and flexibility, while also having good biocompatibility, reducing skin irritation. The addition of moisturizers makes the film more flexible, improving the comfort during wear and increasing the film's durability, reducing cracking and aging. Functional components such as moisturizing and antibacterial agents further enhance the film's skincare effect, effectively protecting skin health. This conductive film composite material can provide a comfortable, safe, and long-lasting user experience, meeting the performance requirements of microcurrent beauty devices.

[0009] In one specific implementation, the degree of polymerization of the polyvinyl alcohol is 2000-2500, and the degree of hydrolysis is 98%-100%.

[0010] By adopting the above technical solution and selecting polyvinyl alcohol with a polymerization degree of 2000-2500 and a hydrolysis degree of 98%-100%, the flexibility, conductivity, and biocompatibility of the composite membrane can be improved. The high polymerization degree enhances the durability and comfort of the membrane, while the high hydrolysis degree ensures lower irritation and better skin adaptability, while maintaining stable conductivity, extending the service life of the membrane and optimizing the overall effect, thus meeting the needs of microcurrent beauty devices.

[0011] In one specific implementation, the polyvinyl alcohol is a single component, and only one degree of polymerization and degree of alcoholysis are selected.

[0012] By adopting the above technical solution and using polyvinyl alcohol with a single degree of polymerization and hydrolysis, the physical properties (such as flexibility, tensile strength, thickness, etc.) of the material are highly consistent in each batch, avoiding differences between different degrees of polymerization or hydrolysis, reducing performance fluctuations, and ensuring the stability of product quality.

[0013] In one specific embodiment, the moisturizer includes one or more of glycerin, propylene glycol, butylene glycol, sorbitol, polyethylene glycol, hexanediol, pentylene glycol, xylitol, and erythritol.

[0014] By adopting the above technical solutions and using the above-mentioned humectants, the flexibility, ductility and processability of materials can be improved, the glass transition temperature can be reduced, and the solubility, hydrophilicity and comprehensive performance of materials can be enhanced, while optimizing cost and environmental protection characteristics. By rationally selecting humectants, the final product can exhibit better stability, durability and comprehensive performance in different application fields.

[0015] In one specific implementation, the conductive component includes one or more of metal salts, zwitterions, and conductive polymers.

[0016] In one specific implementation, the metal salt includes one or more of sodium chloride, potassium chloride, magnesium chloride, and zinc chloride; the zwitterion includes one or more of poly(sulfobetaine methacrylate) and polycarboxylate betaine; and the conductive polymer includes one or more of poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid), polypyrrole, and polyaniline.

[0017] By adopting the above technical solution and using the above conductive components, the conductivity of the material can be effectively improved. Metal salts provide ionic conductivity, zwitterions can regulate conductivity under different environments, enhance ion exchange and conductivity regulation, while conductive polymers enhance the current conduction capability of the material through their own conductive properties. The combination of different conductive components can adjust the conductivity of the material according to the requirements, meet the requirements of various electronic and electrical applications, and at the same time improve the stability and service life of the material.

[0018] In one specific implementation, the functional ingredient includes one or more of sodium hyaluronate, niacinamide, palmitoyl pentapeptide, trehalose, and aloe vera extract.

[0019] By adopting the above technical solutions and utilizing the above functional ingredients, the material can be provided with a variety of skin care, moisturizing, and repairing effects. Sodium hyaluronate has a significant moisturizing effect, niacinamide can improve skin tone and evenness, palmitoyl pentapeptide helps enhance skin elasticity and anti-aging, trehalose provides antioxidant and moisturizing effects, and aloe vera extract helps soothe and repair the skin. By rationally selecting the combination of these ingredients, the functionality of the product can be effectively improved, making it suitable for multiple fields such as skin care, anti-aging, and repair.

[0020] A method for preparing a conductive film composite material as described above, characterized by comprising the following steps: S1. Add polyvinyl alcohol and humectant to deionized water, heat to 90-95℃ and stir to dissolve to obtain polyvinyl alcohol solution; S2. Cool the polyvinyl alcohol solution to 30°C, add the conductive and functional components, stir until homogeneous to obtain a mixed solution, and let it stand to defoam. S3. Pour the defoamed mixed solution into a mold and perform freeze-thaw cycle treatment to obtain a conductive film composite material.

[0021] By adopting the above technical solution, this method dissolves polyvinyl alcohol and a humectant in deionized water to form a polyvinyl alcohol solution. After cooling to a certain temperature, conductive and functional components are added. Through stirring, defoaming, and freeze-thaw cycles, a composite material with excellent conductivity and multiple functions is finally obtained. This method not only ensures the conductivity of the material but also endows it with additional functions such as moisturizing and repairing. It is suitable for applications in electronics, sensors, skin care, and other fields. The entire preparation process is simple and environmentally friendly, and the performance of the material can be flexibly controlled to meet different application needs.

[0022] In one specific implementation, the freeze-thaw cycle treatment is as follows: place at -20°C for 6 hours, place at room temperature for 1 hour, and repeat 3 times.

[0023] By adopting the above technical solutions, through freeze-thaw cycle treatment and the combination of polyvinyl alcohol solution with conductive and functional components, the conductivity, stability and mechanical strength of the material can be improved. It can also optimize the microstructure of the material, enhance its stability and flexibility, and maintain good functionality.

[0024] A conductive film for a microcurrent beauty device is made of the aforementioned conductive film composite material, with a thickness of 1-3 mm, an electrical conductivity of 10-100 mS / cm, and an elongation of 150-300%.

[0025] By adopting the above technical solution, the conductive film with the above characteristics can ensure the efficient conduction of microcurrent. Its excellent flexibility and durability enable it to adapt to the deformation of the device during use and maintain stable performance for a long time. With its excellent conductivity and mechanical strength, the conductive film provides continuous and stable current conduction for microcurrent beauty devices, significantly improving the overall effect and user comfort of the device, and ensuring that the device maintains high efficiency and stability during long-term use.

[0026] In one specific implementation, the conductive film has a porous structure with a pore size of 10-100 μm and a porosity of 50-80%.

[0027] By adopting the above technical solutions, the porous structure helps to improve the contact effect between the material and the skin, enhance the conduction efficiency of microcurrent, improve the user experience of beauty devices, further improve the comfort and applicability of the membrane, and ensure that it can play a better role in the microcurrent beauty process.

[0028] In summary, the beneficial technical effects of this application are as follows: By optimizing the ratio of polyvinyl alcohol, humectant, conductive component, and functional component, the conductive film composite material improves the conductivity, biocompatibility, comfort, and durability of the film; polyvinyl alcohol provides excellent flexibility and structural stability, while the use of humectant enhances the softness and durability of the film; conductive component ensures efficient conduction of microcurrent, and functional component further improves the skin care effect of the film, meeting the needs of microcurrent beauty devices; Through a three-stage freeze-thaw cycle process (6 hours at -20°C, 1 hour at room temperature, repeated 3 times), the microstructure of the membrane is effectively optimized, enhancing the conductivity, stability, and mechanical strength of the material, and improving the membrane's flexibility and durability. This three-stage freeze-thaw process not only improves the membrane's performance but also significantly improves the contact effect between the membrane and the skin, providing a long-lasting and stable current conduction for beauty devices, ensuring a comfortable and safe user experience. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the conductive film composite material in the embodiments of this application.

[0030] Figure 2 This is a flowchart of the preparation method of the conductive film composite material in the embodiments of this application. Detailed Implementation

[0031] Reference Figure 1 This application discloses a conductive film composite material, comprising polyvinyl alcohol (hereinafter referred to as PVA), a humectant, a conductive component, a functional component, and water. In this embodiment, the conductive film composite material is included, but not limited to, its application in microcurrent beauty devices, and can be manufactured as a conductive film for microcurrent beauty devices. To ensure the stability, comfort, and conductivity of the material, the rationality of the formulation and the selection of components are crucial. The following is a detailed description of the amount added to each component and its selection.

[0032] In this embodiment, the amount of PVA added is 10-20 wt% (mass percentage), preferably 10 wt%; PVA, as the base material of the membrane, is responsible for providing structural strength, flexibility and biocompatibility.

[0033] Polymerization degree selection: PVA with a polymerization degree between 2000-2500 is selected to ensure good mechanical strength and membrane durability; a higher polymerization degree enhances the tensile strength and tear resistance of the membrane, making it suitable for microcurrent conduction applications and ensuring membrane stability and resistance to damage during long-term use.

[0034] Degree of hydrolysis: PVA with a degree of hydrolysis between 98% and 100% is selected; PVA in this range has high solubility and biocompatibility, while reducing skin irritation and improving wearing comfort.

[0035] In this embodiment, it is preferable to use PVA with a single degree of polymerization and a single degree of hydrolysis. Using PVA with a single degree of polymerization and a single degree of hydrolysis can ensure the consistency of physical properties between batches, which is suitable for application scenarios with high requirements for quality stability, such as medical aesthetic devices.

[0036] In other applications, combining PVAs with different degrees of polymerization and hydrolysis can optimize multiple properties. For example, PVAs with lower degrees of polymerization perform better in terms of solubility and flexibility, while PVAs with higher degrees of polymerization can provide better structural strength and durability. Typically, high-polymerization-degree PVAs (e.g., 2500) are combined with low-polymerization-degree PVAs (e.g., 2000) to achieve a balance between tensile strength and flexibility. Therefore, by properly combining PVAs with different degrees of polymerization, flexibility and mechanical strength can be balanced in the same material to meet different application requirements.

[0037] In this embodiment, the amount of humectant added is 5-15 wt%, preferably 10 wt%; the main function of the humectant is to improve the flexibility, ductility and processability of the material, while lowering the glass transition temperature and enhancing the comfort and durability of the material.

[0038] The moisturizer includes one or more of glycerin, propylene glycol, butylene glycol, sorbitol, polyethylene glycol, hexanediol, pentylene glycol, xylitol, and erythritol. In this embodiment, the moisturizer is preferably glycerin.

[0039] Glycerin, as a commonly used humectant, has excellent hydrophilicity and low toxicity, which helps to improve the flexibility and extensibility of the membrane and maintain stability in water. Propylene glycol and butylene glycol have good moisturizing properties and low volatility, which can enhance the softness and anti-aging properties of the film. When used in combination with glycerin, they can form a more balanced moisturizing effect, taking into account both the flexibility and durability of the film. Polyethylene glycol has a strong affinity for water, which can further enhance the hydrophilicity and wettability of the material. When using it, it should be used with other humectants such as glycerin or propylene glycol to optimize the overall performance of the material. When choosing a moisturizer, glycerin can be used in combination with a variety of moisturizers such as propylene glycol and butylene glycol. This not only provides excellent flexibility but also improves the durability of the film and avoids problems such as poor solubility or poor uniformity caused by a single moisturizer.

[0040] In this embodiment, the amount of conductive component added is 1-5 wt%, preferably 3 wt%; the conductive component ensures that the microcurrent can be conducted efficiently and stably. The conductive component in this embodiment includes one or more of metal salts, zwitterions, and conductive polymers. In this embodiment, the conductive component is preferably a metal salt.

[0041] Metal salts include one or more of sodium chloride, potassium chloride, magnesium chloride, and zinc chloride. When selecting, the type and content of metal salts can be adjusted according to different current requirements. Sodium chloride and potassium chloride are suitable for low current conductivity applications, while magnesium chloride and zinc chloride are suitable for scenarios with high conductivity requirements. The zwitterions include one or more of poly(sulfobetaine methacrylate) (PSBMA) and polycarboxylate betaine (PCBAA); they have excellent conductivity regulation properties and can adjust the conductivity of the membrane under different environments, thereby enhancing the stability and reliability of the membrane. Conductive polymers include one or more of poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT:PSS), polypyrrole (PPy), and polyaniline (PANI); they have good electrical conductivity and environmental stability, which can further improve the conductivity of the membrane and are suitable for applications with strict requirements for current conduction.

[0042] In this embodiment, the conductive components include, but are not limited to: Combination of metal salts and conductive polymers: Combining the ionic conductivity of metal salts and the electronic conductivity of conductive polymers can significantly improve the conductivity of films, especially in applications requiring stable conductivity. Amphoteric ions and conductive polymers: Amphoteric ions can regulate conductivity in the environment. When used in combination with conductive polymers, they can improve the conductivity stability and anti-interference ability of the membrane, making it suitable for applications with high requirements for current transmission stability.

[0043] In this embodiment, the amount of functional ingredient added is 1-5 wt%, preferably 2 wt%; its main function is to improve the skin care effect of the membrane, including moisturizing, antibacterial, and repair functions.

[0044] The functional ingredients include one or more of sodium hyaluronate, niacinamide, palmitoyl pentapeptide, trehalose, and aloe vera extract. In this embodiment, the functional ingredient is preferably aloe vera extract.

[0045] Sodium hyaluronate has a significant moisturizing effect, effectively moisturizing the skin and enhancing the skin barrier function, making it suitable for applications that require skin moisturizing and soothing. Niacinamide can improve uneven skin tone and promote skin repair, making it suitable for situations where skin condition needs improvement, especially with significant effects on anti-aging and whitening. Palmitoyl pentapeptide has the effect of enhancing skin elasticity and anti-aging, and is a commonly used anti-aging ingredient in skin care. Trehalose has antioxidant, moisturizing and repairing effects, which can effectively improve the health of the skin, and is especially suitable for use when wearing membrane materials for a long time; Aloe vera extract has soothing, repairing, and anti-inflammatory properties, effectively relieving skin irritation and making it especially suitable for sensitive skin.

[0046] In this embodiment, the combination of functional ingredients includes, but is not limited to: The combination of sodium hyaluronate and niacinamide: This combination can provide deep hydration and skin repair at the same time, and is suitable for a variety of skin care needs, especially in anti-aging and skin repair.

[0047] The combination of trehalose and palmitoyl pentapeptide: The combination of the two can provide strong antioxidant and anti-aging effects, while enhancing skin elasticity and firmness, making it especially suitable for long-term use where repair and protection are needed.

[0048] The amount of water added is the balance, usually between 40-60 wt%, and is adjusted according to the amount of other components used. Water acts as a solvent and dispersion medium, helping other components to distribute evenly and improving the processability of the membrane. Appropriate addition of water can optimize the overall performance of the membrane and ensure the comfort of the material during use.

[0049] The above combinations are just examples. Specific ingredient combinations can be flexibly adjusted according to different skincare needs and application scenarios. The selection and proportion of relevant ingredients can be further optimized based on the user's skin type, skincare needs, and expected results to ensure the best skincare effect and comfort.

[0050] Reference Figure 2 This application also provides a method for preparing the conductive film composite material as described above, the method comprising the following steps: S1. Add the required polyvinyl alcohol (PVA) and humectant (such as glycerin, propylene glycol, etc.) to deionized water, heat in an oil bath to 90-95℃, stir at 200 rpm for 60 minutes until the PVA is completely dissolved, and obtain a PVA solution of the required concentration (concentration of 10%-20%). S2. Cool the prepared PVA solution to 30°C, add conductive components (such as metal salts, conductive polymers or zwitterions) and functional components (such as sodium hyaluronate, nicotinamide, aloe vera extract, etc.), and continue stirring for 30 minutes to ensure uniform mixing. After stirring, let stand for 30 minutes to eliminate bubbles. S3. Pour the mixed solution into the mold and perform freeze-thaw cycle treatment. The freeze-thaw cycle steps are: place at -20℃ for 6 hours, place at room temperature (25±2℃) for 1 hour, and repeat this process 3 times. This treatment process can optimize the microstructure of the membrane and increase the flexibility and stability of the membrane. In this embodiment, after freeze-thaw cycle treatment, the conductive film material has a porous structure, which is a 10-100μm microporous structure, thereby improving air permeability. In this embodiment, the method further includes taking out the obtained membrane material after completing the freeze-thaw cycle treatment, drying it, and further cutting and trimming it as needed, depending on the membrane thickness requirements (1-3 mm).

[0051] This method utilizes freeze-thaw cycling technology to optimize the conductivity, stability, and mechanical strength of membrane materials, resulting in excellent electrical conductivity, flexibility, and biocompatibility. By dissolving polyvinyl alcohol and a humectant in deionized water to form a polyvinyl alcohol solution, and then adding conductive and functional components after cooling to a certain temperature, followed by stirring, defoaming, and freeze-thaw cycling, a composite material with excellent conductivity and multiple functions is finally obtained. This not only ensures the material's conductivity but also endows it with additional functions such as moisturizing and repairing, making it suitable for applications in electronics, sensors, and skincare. The entire preparation process is simple and environmentally friendly, allowing for flexible control of material performance to meet diverse application needs.

[0052] The conductive film composite material of this application is particularly suitable for fields such as microcurrent beauty treatments and bioelectric sensing, including but not limited to the manufacture of conductive films in microcurrent beauty devices. The manufactured conductive film has a thickness of 1-3 mm, an electrical conductivity of 10-100 mS / cm, and an elongation of 150-300%; the conductive film has a porous structure with a pore size of 10-100 μm and a porosity of 50-80%.

[0053] The following are examples and comparative examples of different formulations to test the effects of different plasticizers and conductive components on the performance of the composite film. The conductive film composites in both examples and comparative examples were prepared using the method described above (freeze-thaw cycles 3 times).

[0054] Example 1: Composed of the following components in the indicated weight ratios: polyvinyl alcohol with a degree of polymerization of 2500 and a degree of hydrolysis of 98: 10 wt%; glycerin: 10 wt%; sodium chloride: 3 wt%; aloe vera extract (functional ingredient): 2 wt%; balance: water.

[0055] Example 2: Polyvinyl alcohol with a degree of polymerization of 2500 and a degree of hydrolysis of 98: 5wt%; Glycerin: 10wt%; Sodium chloride: 3wt%; Aloe vera extract (functional ingredient): 2wt%; Balance: water.

[0056] Example 3: Polyvinyl alcohol with a degree of polymerization of 2500 and a degree of hydrolysis of 98: 15wt%; Glycerin: 10wt%; Sodium chloride: 3wt%; Aloe vera extract (functional ingredient): 2wt%; Balance: water.

[0057] Example 4: Polyvinyl alcohol with a degree of polymerization of 2500 and a degree of hydrolysis of 98: 10wt%; Glycerin: 5wt%; Sodium chloride: 3wt%; Aloe vera extract (functional ingredient): 2wt%; Balance: water.

[0058] Example 5: Polyvinyl alcohol with degree of polymerization 2500 and degree of hydrolysis 98: 10wt%; Glycerin: 15wt%; Sodium chloride: 3wt%; Aloe vera extract (functional ingredient): 2wt%; Balance: water.

[0059] Example 6: Polyvinyl alcohol with degree of polymerization of 2500 and degree of hydrolysis of 98: 10wt%; Glycerin: 10wt%; Sodium chloride: 1wt%; Aloe vera extract (functional ingredient): 2wt%; Balance: water.

[0060] Example 7: Polyvinyl alcohol with a degree of polymerization of 2500 and a degree of hydrolysis of 98: 10 wt%; Glycerin: 10 wt%; Sodium chloride: 5 wt%; Aloe vera extract (functional ingredient): 2 wt%; Balance: water.

[0061] Comparative Example 1: Polyvinyl alcohol with a degree of polymerization of 2500 and a degree of alcoholysis of 98: 10 wt%; Glycerin: 10 wt%; Sodium chloride: 0 wt%; Aloe vera extract (functional ingredient): 2 wt%; Balance: water.

[0062] Comparative Example 2: Polyvinyl alcohol with degree of polymerization 2500 and degree of alcoholysis 98: 10 wt%; Glycerin: 10 wt%; Sodium chloride: 0.1 wt%; Aloe vera extract (functional ingredient): 2 wt%; Balance: water.

[0063] Comparative Example 3: Polyvinyl alcohol with degree of polymerization of 2500 and degree of alcoholysis of 98: 10 wt%; Glycerin: 10 wt%; Sodium chloride: 10 wt%; Aloe vera extract (functional ingredient): 2 wt%; Balance: water.

[0064] To ensure the technical performance of the conductive film composite material, this application verifies its technical effectiveness through the following test methods: Conductivity: The resistance of the film was measured using an LCR meter and converted into conductivity through calculation; Flexibility: Tested using a tensile testing machine according to ASTM D638 standard, with a tensile speed of 10 mm / min, and the elongation at break was recorded. Peel strength: Tested using a peel strength tester. Biocompatibility: Observe whether redness, swelling, inflammation, or other reactions occur through skin contact testing. Mouse skin tests or alternative methods (such as human skin models) can be used.

[0065] Table 1: Performance test results of different embodiments and comparative examples According to the performance test results of different embodiments and comparative examples in Table 1, it can be seen that embodiments (1-7) all exhibit good comprehensive performance and meet the application requirements of conductive films for microcurrent beauty devices.

[0066] Technical advantages of embodiments (1-7): Safe conductivity: Within the range of 1-5wt% conductive content, it ensures both effective conductivity (10-100mS / cm) and skin safety; Comfortable fit: 5-15wt% moisturizer keeps the stretch ratio within a reasonable range of 150-300%, perfectly conforming to the curves of the human body; Durable breathability: WVTR maintained at 220-295 g / m 2 ·day, significantly superior to traditional materials; Biocompatibility: No adverse reactions such as redness or inflammation were observed in any of the embodiments after skin testing.

[0067] Comparative examples (1-3) all exhibit various usage defects: Comparative Example 1: Non-conductive, conductivity <10 -6 S / m, the conductivity function is completely lost; Comparative Example 2: Insufficient conductivity, with a conductivity of only 2.1 × 10⁻⁶. -3 S / m, low conductivity; Comparative Example 3: Excessive conductive components caused skin irritation due to excessively high concentration of conductive ions, resulting in erythema and skin irritation. The effect of freeze-thaw cycles on the properties of conductive film composites was also investigated, and the influence of different production processes on the properties of the composite film was tested. Under the condition that other factors remained unchanged (10 wt% polyvinyl alcohol, 10 wt% humectant, 3 wt% conductive component, 2 wt% functional component), the following were prepared: 1 freeze-thaw cycle (-20℃ / 6h + room temperature / 1h), 2 freeze-thaw cycles (2 cycles under the same conditions), 3 freeze-thaw cycles (process of this application), 4 freeze-thaw cycles (4 cycles under the same conditions), and 5 freeze-thaw cycles (5 cycles under the same conditions).

[0068] Performance testing includes tests for porosity, electrical conductivity, tensile strength, WVTR, and structural characteristics. Porosity testing includes, but is not limited to, the mercury intrusion porosimetry method (ASTM D4404). Structural characteristics characterization includes, but is not limited to, SEM analysis, micro-CT, and pore size distribution analysis (ImageJ software analysis: based on SEM images). The remaining test methods are the same as those described above.

[0069] Table 2: Comparison Test Results of Performance of Different Production Processes As can be seen from Table 2: One freeze-thaw cycle: forms a discontinuous honeycomb structure with obvious phase separation, indicating non-uniform structure, which affects electrical conductivity and mechanical properties; Two freeze-thaw cycles: some pores are connected and local conductive networks are aggregated, but there is still a certain degree of non-uniformity; Three freeze-thaw cycles: forming an ideal three-dimensional interconnected network structure with uniform pore size distribution, indicating that the material structure is most ideal at this time, providing good mechanical, electrical and air permeability properties; Four freeze-thaw cycles: structural shrinkage, reduced edge porosity, affecting the overall performance of the material; Five freeze-thaw cycles: the appearance of microcracks and edge warping indicates that the material's structure has begun to be damaged, affecting the stability of its performance.

[0070] The three-stage freeze-thaw process exhibits the best performance in terms of porosity, electrical conductivity, elongation, and structural properties, effectively optimizing material performance while ensuring good production feasibility (reduced energy consumption and improved yield). In contrast, the performance of the one-stage and two-stage freeze-thaw processes is lower, while the four-stage and five-stage processes, although slightly improving porosity and electrical conductivity, result in a decrease in electrical conductivity and overall performance. Therefore, the three-dimensional interconnected network structure of the three-stage freeze-thaw process performs optimally under all freeze-thaw conditions, providing the best performance.

[0071] This application achieves highly efficient and stable current conduction performance through a reasonable component ratio, ensuring that the conductive film composite material can meet different current requirements and maintain stability in microcurrent beauty devices. The golden ratio of moisturizer (10wt%) to conductive component (3wt%) and the key control points of the freeze-thaw cycle process (-20℃ / 6h + room temperature / 1h, 3 cycles) give the material excellent comfort and biocompatibility, reducing skin irritation and improving the wearing experience. Furthermore, through the addition of functional ingredients, the film material also has multiple skin care effects, such as moisturizing, repairing, and anti-aging, meeting beauty care needs. This conductive film composite material has broad application prospects, providing efficient current conduction and comfortable skin care effects, combining excellent performance and market potential.

[0072] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A conductive film composite material, characterized in that: It consists of the following components in the indicated weight ratios: Polyvinyl alcohol: 10-20 wt% Moisturizer: 5-15 wt% Conductive component: 1-5 wt% Functional ingredients: 1-5 wt% The remainder is water.

2. The conductive film composite material according to claim 1, characterized in that: The degree of polymerization of the polyvinyl alcohol is 2000-2500, and the degree of alcoholysis is 98%-100%.

3. The conductive film composite material according to claim 2, characterized in that: The polyvinyl alcohol is a single component, and only one degree of polymerization and degree of alcoholysis are selected.

4. The conductive film composite material according to claim 1, characterized in that: The moisturizer includes one or more of glycerin, propylene glycol, butylene glycol, sorbitol, polyethylene glycol, hexanediol, pentylene glycol, xylitol, and erythritol.

5. The conductive film composite material according to claim 1, characterized in that: The conductive component includes one or more of metal salts, zwitterions, and conductive polymers.

6. The conductive film composite material according to claim 5, characterized in that: The metal salt includes one or more of sodium chloride, potassium chloride, magnesium chloride, and zinc chloride; the zwitterion includes one or more of poly(sulfobetaine methacrylate) and polycarboxylate betaine; the conductive polymer includes one or more of poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid), polypyrrole, and polyaniline.

7. The conductive film composite material according to claim 1, characterized in that: The functional ingredients include one or more of sodium hyaluronate, niacinamide, palmitoyl pentapeptide, trehalose, and aloe vera extract.

8. A method for preparing a conductive film composite material as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Add polyvinyl alcohol and humectant to deionized water, heat to 90-95℃ and stir to dissolve to obtain polyvinyl alcohol solution; S2. Cool the polyvinyl alcohol solution to 30°C, add the conductive and functional components, stir until homogeneous to obtain a mixed solution, and let it stand to defoam. S3. Pour the defoamed mixed solution into a mold and perform freeze-thaw cycle treatment to obtain a conductive film composite material.

9. The preparation method according to claim 8, characterized in that: The freeze-thaw cycle treatment is as follows: place at -20℃ for 6 hours, place at room temperature for 1 hour, and repeat 3 times.

10. A conductive film for a microcurrent beauty device, characterized in that: Made from the conductive film composite material according to any one of claims 1-7, having a thickness of 1-3 mm, an electrical conductivity of 10-100 mS / cm, and an elongation of 150-300%.

11. The conductive film for microcurrent beauty devices according to claim 10, characterized in that: The conductive film has a porous structure with a pore size of 10-100 μm and a porosity of 50-80%.

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