Integrated multifunctional artificial scalp for wig and preparation method thereof

Abstract

The invention discloses an integrated multifunctional artificial scalp for wig and a preparation method thereof, the preparation method takes an electrostatic spinning nanofiber membrane as a core carrier, and the integrated multifunctional artificial scalp is prepared from a spinning solution containing a fluoride-free water repellent agent, a quaternary ammonium salt type cationic surface active agent and a bacteriostatic agent through an electrostatic spinning process, the fiber membrane with the micro-nano hole structure is formed. According to the structural design, the artificial scalp is endowed with an excellent synergistic effect of air permeability, waterproofness and antibacterial performance, a dry and comfortable state in a wearing process can be effectively maintained, microorganism breeding in a humid environment is inhibited, and the artificial scalp has wearing comfort and use safety.

Description

Technical Field

[0001] This invention relates to the field of artificial scalp technology, specifically to an integrated multifunctional artificial scalp for wigs and its preparation method. Background Technology

[0002] With the accelerating pace of modern life and the ever-increasing pressure of professional competition, hair loss has become a prominent issue affecting the physical and mental health and social interactions of people aged 25-45 in my country (especially working professionals). Related data shows that over 50% of this age group experiences varying degrees of hair loss. As an important means of improving appearance and maintaining social confidence, wigs have expanded their application from traditional daily wear to diverse scenarios such as commuting, office work, sports and fitness, outdoor hiking, and water activities, leading to increasingly stringent demands for product functionality.

[0003] As the core functional carrier of wigs, the performance parameters of artificial scalps directly determine wearing comfort and safety. Currently, mainstream artificial scalps for wigs have significant functional defects, specifically: First, insufficient breathability: Traditional products often use sealed lace or polyurethane (PU) base materials, which cannot effectively allow for the rapid evaporation of sweat secreted by the real scalp. After wearing for 2 hours, the local humidity of the scalp can reach over 85%, easily causing a stuffy feeling. Long-term wear can induce scalp inflammation such as folliculitis. Second, lack of waterproof performance: In water activities or rainy weather, external moisture can easily penetrate through the artificial scalp layer to the surface of the real scalp, resulting in a continuously damp scalp and significantly exacerbating the sticky and uncomfortable feeling. Third, insufficient antibacterial function: The long-term damp microenvironment caused by poor breathability promotes the proliferation of opportunistic pathogens such as Malassezia, not only damaging the scalp's skin barrier function but also increasing the risk of scalp itching, seborrheic dermatitis, and other diseases.

[0004] To address these issues, existing technologies attempt to achieve functional integration through multi-layered composite structures. For example, Chinese patent CN222322908U discloses a highly breathable wig, which constructs a composite system with breathable, waterproof, and antibacterial functions by sequentially composited a first waterproof and breathable layer of silicone, a second waterproof and breathable layer of polyethylene, a polyester sweat-absorbing layer, a nylon antibacterial layer, and a skin-friendly layer beneath a simulated scalp layer. However, this technical solution has inherent drawbacks: the functional realization relies on the stacking and composite of multiple material layers, resulting in a complex overall structure and cumbersome manufacturing process; the multi-layered structure makes the product heavy, increasing the burden of wearing it; and interlayer interface compatibility issues may lead to a decrease in functional synergy, making it difficult to meet users' needs for lightweight and highly integrated functions.

[0005] Therefore, developing a wig scalp that is simple in structure, lightweight in texture, and has excellent breathability, waterproofness and antibacterial properties has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide an integrated, multifunctional artificial scalp for wigs and its preparation method, wherein the artificial scalp for wigs combines waterproof, breathable, and antibacterial functions.

[0007] The above-mentioned objective of this invention is achieved through the following technical solutions: A method for preparing an integrated multifunctional artificial scalp for wigs includes the following steps: (1) By weight, 10-15 parts of thermoplastic polyurethane, 0.1-2 parts of organic dye, 2-10 parts of fluorine-free hydrophobic agent, 0.001-0.02 parts of quaternary ammonium salt cationic surfactant and 0.1-2 parts of antibacterial agent are dissolved in 65-74 parts of solvent to obtain a spinning solution; the quaternary ammonium salt cationic surfactant is selected from one or more of dioctadecyl dimethyl ammonium chloride, dodecyl trimethyl ammonium bromide and (2,3-dioleoyl-propyl)-trimethyl ammonium chloride, and the antibacterial agent is alkali-modified graphene oxide and / or alkali-modified carbon nanotubes; the alkali-modified graphene oxide is prepared by soaking graphene oxide in 0.1-1 M NaOH solution for 0.5-2 h; the alkali-modified carbon nanotubes are prepared by soaking carbon nanotubes in 0.1-1 M NaOH solution for 0.5-2 h; (2) Electrospinning is performed on the spinning solution obtained in step (1) to obtain an electrospun nanofiber membrane; (3) The electrospun nanofiber membrane obtained in step (2) is subjected to hair bonding treatment. Moisture-curing reactive polyurethane hot melt adhesive (PUR) is applied to the root of the hair strands so that the hair strands are fixed to the outer surface of the electrospun nanofiber membrane with the root as the bonding site. Then, a curing treatment is performed to obtain the integrated multifunctional artificial scalp for wigs.

[0008] The artificial scalp for wigs of this invention uses an electrospun nanofiber membrane as its core carrier. It is prepared by electrospinning a spinning solution containing a fluorine-free hydrophobic agent, a quaternary ammonium salt-type cationic surfactant, and an antibacterial agent, forming a fiber membrane with a micro-nano porous structure. This structural design endows the artificial scalp with excellent breathability, waterproofness, and antibacterial properties, effectively maintaining a dry state during wear, inhibiting the growth of microorganisms in humid environments, and combining wearing comfort with safety.

[0009] This invention achieves integrated waterproof, breathable, and antibacterial functions within a single fiber membrane structure through precise control of raw material selection, proportioning, and process parameters. This overcomes the shortcomings of existing technologies, such as reliance on multi-layer composites, complex structures, and uncomfortable wear, demonstrating outstanding ingenuity. The synergistic effect of the various raw materials forms an organic functional system, resulting in a qualitative leap in the performance of the prepared artificial scalp and meeting consumer demand for high-quality wig products.

[0010] Further, in step (1), the molecular weight of the thermoplastic polyurethane is 80-200 kDa.

[0011] Further, in step (1), the thermoplastic polyurethane is a polyether polyurethane and / or a polyester polyurethane. Both polyether polyurethane and polyester polyurethane have excellent elasticity, toughness and wear resistance.

[0012] If the amount of thermoplastic polyurethane is less than 10 parts, it is difficult to form a continuous fiber structure, resulting in insufficient mechanical properties of the membrane and easy damage; if it is more than 15 parts, it will increase the viscosity of the spinning solution, resulting in unstable jet during spinning and difficulty in forming uniform nanofibers.

[0013] Furthermore, in step (1), the organic dye is selected from azo dyes and / or anthraquinone dyes. These dyes have good stability and dyeing properties, and are well compatible with raw materials such as thermoplastic polyurethane, so that the fiber membrane presents a natural color close to that of human scalp, thereby improving the realism of the wig.

[0014] Excessive use of organic dyes may affect the stability of the spinning solution, resulting in poor fiber forming effect.

[0015] Furthermore, in step (1), the molecular weight of the fluorine-free hydrophobic agent is 10-70 kDa.

[0016] Further, in step (1), the fluorine-free hydrophobic agent is selected from one or more of polydimethylsiloxane (PDMS), polymethylhydrosiloxane (PMS), and polysilsesquioxane (POSS). This type of fluorine-free hydrophobic agent has dual compatibility; the carbon-hydrogen bonds in its molecular chain enable it to be well-compatible with organic polymers such as thermoplastic polyurethane, while the silicon-oxygen bonds on its main chain can bind well with inorganic substances such as alkali-modified antibacterial agents, thus facilitating the good dispersion of the antibacterial agent in the spinning solution. Simultaneously, it has low surface energy characteristics, so it can accumulate on its surface during the spinning process as the fiber is formed, thereby endowing the fiber membrane with excellent waterproof performance without excessively affecting the air permeability of the fiber membrane.

[0017] Excessive use of fluorine-free hydrophobic agents can affect the air permeability of the fiber membrane and may cause adhesion between fibers.

[0018] If the amount of quaternary ammonium salt cationic surfactant is too low, its directional adsorption and synergistic antibacterial effects cannot be fully utilized; if the amount is too high, it may cause the spinning solution to be too conductive, affecting the fiber morphology.

[0019] When the amount of antibacterial agent is less than 0.1 parts, the antibacterial effect is not significant; when it is more than 2 parts, it is easy to agglomerate, which affects the spinning process and the performance of the fiber membrane.

[0020] Further, in step (1), the solvent is selected from one or more of dichloromethane, toluene, and dimethyl sulfoxide.

[0021] Thermoplastic polyurethane, organic dyes, fluorine-free hydrophobic agents, and quaternary ammonium cationic surfactants are all soluble in the solvent, while the antibacterial agent is dispersed in the spinning solution as nanoparticles. This dissolution and dispersion state allows the components to be uniformly distributed in the fiber during spinning, thus ensuring the uniformity of the fiber membrane's properties. The quaternary ammonium cationic surfactant can dissolve in the solution to exert its surface-active effect, and it can also bind to the fluorine-free hydrophobic agent through hydrophobic interactions and adsorb the antibacterial agent nanoparticles, forming a synergistic system.

[0022] Further, in step (2), the spinning solution obtained in step (1) is pumped into the spinning nozzle, and a high voltage electrostatic field is applied outside the spinning nozzle. The spinning solution jet is deformed to form spinning fibers. The spinning fibers are deposited on the receiver to obtain an electrospun nanofiber membrane.

[0023] Further, in step (2), the process parameters of electrospinning include: the flow rate of the spinning nozzle is 1-5 mL / h, the working voltage of the high voltage electrostatic field is 15-28 kV, the distance between the nozzle and the receiver is 15-30 cm, the receiver rotation speed is 150-280 rpm, the spinning temperature is 25-35 ℃, and the relative humidity is 40%-65%.

[0024] In step (3), PUR has excellent adhesive strength and water resistance, and can form a good bond with both electrospun nanofiber membrane and hair strands, ensuring that the hair strands are not easy to fall off during long-term use.

[0025] Furthermore, the aging process is carried out at a temperature of 65-85 °C for 4-8 h.

[0026] If the temperature is below 65 ℃, the curing reaction rate is too slow, the adhesive layer is not fully cured, and the bonding strength is insufficient; if the temperature is above 85 ℃, the adhesive layer may age, affecting the bonding performance.

[0027] Furthermore, step (3) also includes a scalp shaping process, specifically: one or more pieces of artificial scalp are spliced ​​together by stitching or PUR bonding, so that the spliced ​​composite forms a three-dimensional structure that is compatible with the physiological shape of the human head, and an artificial scalp in the shape of the head is obtained.

[0028] This invention also protects the integrated multifunctional artificial scalp for wigs prepared by the above-described method.

[0029] Furthermore, the integrated multifunctional artificial scalp for wigs is composed of an electrospun nanofiber membrane with a micro-nano porous structure.

[0030] The beneficial effects of this invention are: 1. This invention introduces electrospun nanofiber membranes into the field of artificial scalps for wigs. Through precise control of spinning process parameters, the fiber membrane forms a continuous micro-nanopore structure. This unique structure enables efficient directional diffusion and rapid release of scalp water vapor, fundamentally solving the problem of stuffiness caused by sweat accumulation in traditional products. Even with prolonged wear, the scalp remains dry and comfortable. Compared to traditional technologies that rely on multi-layer composite structures to achieve breathability, this invention achieves superior breathability with a single fiber membrane structure, simplifying the structure while achieving a performance breakthrough.

[0031] 2. This invention introduces a fluorine-free hydrophobic agent into the spinning system. Utilizing its low surface energy, a uniformly enriched hydrophobic layer is formed on both the inner and outer surfaces of the fiber membrane, giving the artificial scalp excellent resistance to liquid penetration. In outdoor wading or rainy conditions, it effectively blocks external moisture from penetrating to the real scalp, completely eliminating the sticky discomfort caused by dampness. This method of achieving hydrophobicity directly during the spinning process, compared to traditional post-coating treatments, not only ensures long-lasting waterproof performance but also avoids damaging the breathability of the fiber membrane, achieving synergistic optimization of waterproofing and breathability.

[0032] 3. The quaternary ammonium salt cationic surfactant in this invention exhibits dual technical benefits: on the one hand, it possesses direct antibacterial activity; on the other hand, it combines with a fluorine-free hydrophobic agent through hydrophobic interactions and adsorbs negatively charged antibacterial agents based on its positive charge characteristics, forming a "hydrophobic agent-surfactant-antibacterial agent" composite enrichment layer. This composite system is directionally distributed on the fiber membrane surface, significantly enhancing the long-lasting sustained-release capability of the antibacterial components. It can effectively inhibit the growth and reproduction of bacteria on the scalp surface, thereby reducing the risk of inflammatory reactions such as itching and seborrheic dermatitis, and comprehensively improving the safety and comfort of wearing the product. This multi-component synergistic antibacterial mechanism overcomes the limitations of single antibacterial agents, achieving a qualitative improvement in antibacterial performance.

[0033] 4. The preparation process of this invention is characterized by its simplicity and controllable flow, significantly reducing energy consumption and technical barriers in production. This provides favorable conditions for large-scale industrial production and helps promote the widespread application of integrated multifunctional artificial scalps for wigs. Compared to the complex multi-layer composite processes in existing technologies, the technical solution of this invention is easier to implement industrially, ensuring high product performance while possessing significant economic benefits and application prospects. Detailed Implementation

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention will be further described below with reference to specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0036] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available.

[0037] Example 1 A method for preparing an integrated multifunctional artificial scalp for wigs includes the following steps: (1) By weight, 15 parts of polyether polyurethane (molecular weight 150 kDa), 0.5 parts of 1-(4-sulfonylphenyl)-4-(4-sulfonylphenylazo)-5-pyrazolone-3-carboxylic acid trisodium salt dye, 2.5 parts of fluorine-free hydrophobic agent PDMS and 0.002 parts of dioctadecyl dimethyl ammonium chloride were dissolved in a mixed solvent of 65 parts of dichloromethane and toluene (volume ratio of dichloromethane to toluene was 2:1), and 0.5 parts of alkali-modified graphene oxide were added to disperse it evenly to obtain a spinning solution; the alkali-modified graphene oxide was prepared by soaking graphene oxide in 1 M NaOH solution for 2 h; (2) The spinning solution is pumped into the spinning nozzle, and a high voltage electrostatic field of 20 kV is applied outside the spinning nozzle. The flow rate of the spinning nozzle is 2 mL / h, the distance between the nozzle and the receiver is 18 cm, the receiver rotation speed is 200 rpm, the spinning temperature is 25℃, and the relative humidity is 50%. The spinning solution jet is deformed to form spinning fibers. The spinning fibers are deposited on the receiver to obtain an electrospun nanofiber membrane. (3) Apply moisture-curing reactive polyurethane hot melt adhesive (PUR) to the root of the wig, so that the wig is fixed to the outer surface of the electrospun nanofiber membrane with the root as the binding point. After curing at 70 °C for 5 h, and then after scalp shaping treatment, an integrated multifunctional artificial scalp for wigs with the shape of the head is obtained.

[0038] Example 2 A method for preparing an integrated multifunctional artificial scalp for wigs includes the following steps: (1) By weight, 15 parts of polyester polyurethane (molecular weight 150 kDa), 0.5 parts of 1-amino-2-phenoxy-4-hydroxyanthraquinone dye, 3 parts of fluorine-free hydrophobic agent PMS and 0.003 parts of dodecyltrimethylammonium bromide were dissolved in a mixed solvent of 68 parts of dichloromethane and dimethyl sulfoxide (volume ratio of dichloromethane to dimethyl sulfoxide is 2:1), and 1.5 parts of alkali-modified carbon nanotubes were added to disperse them uniformly to obtain a spinning solution; the alkali-modified carbon nanotubes were prepared by soaking carbon nanotubes in 1 M NaOH solution for 2 h. (2) The spinning solution is pumped into the spinning nozzle, and a high voltage electrostatic field of 15 kV is applied outside the spinning nozzle. The flow rate of the spinning nozzle is 3 mL / h, the distance between the nozzle and the receiver is 16 cm, the receiver rotation speed is 180 rpm, the spinning temperature is 25℃, and the relative humidity is 50%. The spinning solution jet is deformed to form spinning fibers. The spinning fibers are deposited on the receiver to obtain an electrospun nanofiber membrane. (3) Apply moisture-curing reactive polyurethane hot melt adhesive (PUR) to the root of the wig, so that the wig is fixed to the outer surface of the electrospun nanofiber membrane with the root as the binding point. After curing at 70 °C for 5 h, and then after scalp shaping treatment, an integrated multifunctional artificial scalp for wigs with the shape of the head is obtained.

[0039] Example 3 A method for preparing an integrated multifunctional artificial scalp for wigs includes the following steps: (1) By weight, 5 parts of polyether polyurethane (molecular weight 150 kDa), 5 parts of polyester polyurethane, 2 parts of 1-(4-sulfonylphenyl)-4-(4-sulfonylphenylazo)-5-pyrazolone-3-carboxylic acid trisodium salt dye, 10 parts of fluorine-free hydrophobic agent POSS and 0.02 parts of (2,3-dioleoylpropyl)-trimethylammonium chloride were dissolved in a mixed solvent of 74 parts of toluene and dimethyl sulfoxide (volume ratio of toluene and dimethyl sulfoxide was 2:1). 1 part of alkali-modified graphene oxide and 1 part of alkali-modified carbon nanotubes were added and uniformly dispersed to obtain a spinning solution. The alkali-modified graphene oxide was prepared by soaking graphene oxide in 1 M NaOH solution for 2 h. The alkali-modified carbon nanotubes were prepared by soaking carbon nanotubes in 1 M NaOH solution for 2 h. (2) The spinning solution is pumped into the spinning nozzle, and a high voltage electrostatic field of 28 kV is applied outside the spinning nozzle. The flow rate of the spinning nozzle is 5 mL / h, the distance between the nozzle and the receiver is 30 cm, the receiver rotation speed is 280 rpm, the spinning temperature is 25℃, and the relative humidity is 50%. The spinning solution jet is deformed to form spinning fibers. The spinning fibers are deposited on the receiver to obtain an electrospun nanofiber membrane. (3) Apply moisture-curing reactive polyurethane hot melt adhesive (PUR) to the root of the wig, so that the wig is fixed to the outer surface of the electrospun nanofiber membrane with the root as the binding point. Then, perform curing treatment at 85 °C for 8 h, and then perform scalp shaping treatment to obtain an integrated multifunctional artificial scalp for wigs with the shape of the head.

[0040] Comparative Example 1 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that: in step (1), 0.002 parts of dioctadecyl dimethyl ammonium chloride are not added.

[0041] Comparative Example 2 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (1), dioctadecyl dimethyl ammonium chloride is replaced with sodium dodecyl sulfate.

[0042] Comparative Example 3 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that: in step (1), 2.5 parts of fluorine-free hydrophobic agent PDMS are not added.

[0043] Comparative Example 4 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (1), alkali-modified graphene oxide is replaced with unmodified graphene oxide.

[0044] Comparative Example 5 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (1), alkali-modified graphene oxide is replaced with nano-silver antibacterial agent.

[0045] Comparative Example 6 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (1), polyether polyurethane is replaced with polyvinyl chloride.

[0046] Comparative Example 7 A method for preparing an artificial scalp for wigs is basically the same as in Example 1, except that: in step (1), by weight, 15 parts of polyether polyurethane, 0.5 parts of 1-(4-sulfonylphenyl)-4-(4-sulfonylphenylazo)-5-pyrazolone-3-carboxylic acid trisodium salt dye, 10 parts of fluorine-free hydrophobic agent PDMS and 0.05 parts of dioctadecyl dimethyl ammonium chloride are dissolved in a mixed solvent of 65 parts of dichloromethane and toluene (the volume ratio of dichloromethane to toluene is 2:1), and 0.5 parts of alkali-modified graphene oxide are added to disperse it evenly to obtain a spinning solution; the alkali-modified graphene oxide is prepared by soaking graphene oxide in 1 M NaOH solution for 2 h.

[0047] Comparative Example 8 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (3), solvent-based neoprene rubber (containing toluene solvent) is applied to the root of the wig hair and directly bonded to the surface of the fiber membrane, and then air-dried at room temperature (without curing treatment).

[0048] Comparative Example 9 A method for preparing an artificial scalp for wigs is basically the same as that in Example 1, except that in step (3), EVA hot melt adhesive (thermoplastic adhesive) is applied to the root of the wig hair at a fixed point, heated to 120 ℃ to melt and bond, and then cooled naturally without curing treatment.

[0049] Test Example 1 The artificial scalps for wigs prepared in Examples 1-3 and Comparative Examples 1-9 were subjected to performance tests. The air permeability test was conducted according to GB / T 40357-2021 "Determination of air permeability of hair products wigs" standard, the water resistance test was conducted according to GB / T 4744-2013 "Test and evaluation of water resistance of textiles - hydrostatic test" standard, and the antibacterial test was conducted according to JIS L 1902 "Test method for antibacterial properties of textiles" standard. The test strain was Staphylococcus aureus.

[0050] The test results are shown in Table 1: Table 1

[0051] As can be seen from Table 1, the artificial scalp prepared in the embodiments of the present invention exhibits excellent performance in terms of breathability, water pressure resistance, and antibacterial rate, and can simultaneously achieve the integrated functions of waterproofing, breathability, and antibacterial properties.

[0052] The antibacterial rate of Comparative Example 1 was significantly lower, indicating that when quaternary ammonium cationic surfactants are absent in the system, the antibacterial effect relies solely on the intrinsic function of the antibacterial agent. Due to the lack of directional adsorption and enrichment by surfactants, the antibacterial agent can only be uniformly dispersed within the fibers and cannot effectively migrate to the interface in contact with the human scalp. This results in insufficient effective antibacterial concentrations on the inner and outer surfaces of the artificial scalp, thereby significantly weakening the overall antibacterial efficacy.

[0053] The antibacterial rate of Comparative Example 2 was significantly lower. This result indicates that when sodium dodecyl sulfate (SLS) anionic surfactant is added to the system, the surfactant and the antibacterial agent repel each other, preventing the antibacterial agent from being uniformly dispersed in the spinning solution. This leads to a decrease in the spinnability of the spinning solution, and consequently, a significant reduction in the overall performance of the membrane material prepared based on this spinning solution, such as its air permeability and water pressure resistance. Furthermore, due to the uneven dispersion of the antibacterial agent in the membrane material, when the membrane material is applied to the scalp surface, the antibacterial agent cannot form a stable and uniform interface, ultimately resulting in a substantial reduction in its antibacterial effect.

[0054] The water pressure resistance and antibacterial rate of Comparative Example 3 both decreased significantly, indicating that the lack of fluorine-free hydrophobic agent not only directly reduced the waterproof performance of the artificial scalp, but more importantly, because the hydrophobic agent lost the enrichment carrier provided by the surface segregation effect for the antibacterial agent, it was difficult for the antibacterial components to form an effective concentration on the material surface, ultimately leading to a significant reduction in the surface antibacterial function.

[0055] The antibacterial effect of Comparative Example 4 was significantly reduced, indicating that the neutral antibacterial agent exhibits a specific distribution pattern in the system. It exists more in the fiber interior and fiber surface in an evenly distributed manner, resulting in a smaller proportion of the surface portion that can actually exert antibacterial effect, thus significantly limiting the antibacterial effect.

[0056] In Comparative Example 5, since nano-silver is an electrically neutral antibacterial agent, it cannot generate electrostatic interactions with positively charged quaternary ammonium salt cationic surfactants. As a result, nano-silver can only exist in a uniformly dispersed state inside the fibers of the artificial scalp and is difficult to be directionally enriched on the surface, thus resulting in a low antibacterial rate.

[0057] Comparative Example 6 showed a significant decrease in air permeability and a low antibacterial rate. This is because polyvinyl chloride (PVC) has a low glass transition temperature, and during the curing process, it melts. The melted substance directly blocks the pore structure of the membrane material, leading to a substantial reduction in air permeability. Simultaneously, the antibacterial agent adhering to the fiber surface is encapsulated within the fiber due to the melting of PVC, preventing effective contact with external microorganisms and ultimately resulting in a significantly reduced antibacterial effect.

[0058] Comparative Example 7 exhibits low water pressure resistance and antibacterial rate. This is because excessive addition of the dioctadecyl dimethyl ammonium chloride surfactant leads to excessively high conductivity and low surface tension in the spinning system. This disrupts the formation conditions of a stable Taylor cone during electrospinning and prevents the maintenance of a stable jet state, severely affecting the morphology and properties of the prepared fibers and ultimately resulting in a decline in the overall performance of the membrane material.

[0059] Compared with Comparative Example 8, the air permeability increased, but the water pressure resistance and antibacterial rate decreased significantly. This is because solvent-based chloroprene rubber was used, and its solvent contains toluene, which can dissolve the polyurethane scalp substrate, causing damage to the scalp membrane structure and perforation on the membrane surface. Although the perforated structure increases air permeability, it completely destroys the membrane's density, resulting in a significant decrease in water pressure resistance. At the same time, the damage to the scalp substrate also causes the antibacterial system to fail, so the antibacterial activity decreases synchronously with the damage to the substrate structure.

[0060] The air permeability of Comparative Example 9 was significantly reduced because the EVA hot melt adhesive requires a high temperature of 120 ℃ for melting and bonding. At this temperature, the polyurethane scalp substrate softens at 120 ℃, and the softened fibers bond together, directly causing a significant decrease in the porosity of the membrane material, which in turn leads to a reduction in air permeability. At the same time, the amount of antibacterial agent exposed on the fiber surface will decrease as the fibers soften and bond, ultimately resulting in a simultaneous decrease in antibacterial performance.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art should understand that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing an integrated multifunctional artificial scalp for wigs, characterized in that, Includes the following steps: (1) By weight, 10-15 parts of thermoplastic polyurethane, 0.1-2 parts of organic dye, 2-10 parts of fluorine-free hydrophobic agent, 0.001-0.02 parts of quaternary ammonium salt cationic surfactant and 0.1-2 parts of antibacterial agent are dissolved in 65-74 parts of solvent to obtain a spinning solution; the quaternary ammonium salt cationic surfactant is selected from one or more of dioctadecyl dimethyl ammonium chloride, dodecyl trimethyl ammonium bromide and (2,3-dioleoyl-propyl)-trimethyl ammonium chloride, and the antibacterial agent is alkali-modified graphene oxide and / or alkali-modified carbon nanotubes; the alkali-modified graphene oxide is prepared by soaking graphene oxide in 0.1-1 M NaOH solution for 0.5-2 h; the alkali-modified carbon nanotubes are prepared by soaking carbon nanotubes in 0.1-1 M NaOH solution for 0.5-2 h; (2) Electrospinning is performed on the spinning solution obtained in step (1) to obtain an electrospun nanofiber membrane; (3) The electrospun nanofiber membrane obtained in step (2) is subjected to hair bonding treatment. Moisture-curing reactive polyurethane hot melt adhesive is applied to the root of the hair to fix the hair to the outer surface of the electrospun nanofiber membrane with the root as the bonding site. Then, a curing treatment is performed to obtain the integrated multifunctional artificial scalp for wigs.

2. The preparation method according to claim 1, characterized in that, In step (1), the thermoplastic polyurethane is a polyether polyurethane and / or a polyester polyurethane.

3. The preparation method according to claim 1, characterized in that, In step (1), the organic dye is selected from azo dyes and / or anthraquinone dyes.

4. The preparation method according to claim 1, characterized in that, In step (1), the fluorine-free hydrophobic agent is selected from one or more of polydimethylsiloxane, polymethylhydrosiloxane and polysilsesquioxane.

5. The preparation method according to claim 1, characterized in that, In step (1), the solvent is selected from one or more of dichloromethane, toluene and dimethyl sulfoxide.

6. The preparation method according to claim 1, characterized in that, In step (2), the spinning solution obtained in step (1) is pumped into the spinning nozzle, and a high voltage electrostatic field is applied outside the spinning nozzle. The spinning solution jet is deformed to form spun fibers. The spun fibers are deposited on the receiver to obtain an electrospun nanofiber membrane.

7. The preparation method according to claim 1 or 6, characterized in that, In step (2), the electrospinning process parameters include: the flow rate of the spinning nozzle is 1-5 mL / h, the working voltage of the high voltage electrostatic field is 15-28 kV, the distance between the nozzle and the receiver is 15-30 cm, the receiver rotation speed is 150-280 rpm, the spinning temperature is 25-35 ℃, and the relative humidity is 40%-65%.

8. The preparation method according to claim 1, characterized in that, In step (3), the aging process is carried out at a temperature of 65-85 ℃ for 4-8 h.

9. The preparation method according to claim 1, characterized in that, Step (3) also includes a scalp shaping process, specifically: one or more pieces of artificial scalp are compositely spliced ​​by sewing or moisture-curing reactive polyurethane hot melt adhesive, so that the composite after splicing forms a three-dimensional structure that is compatible with the physiological shape of the human head, and an artificial scalp in the shape of the head is obtained.

10. An integrated multifunctional artificial scalp for wigs prepared by the preparation method according to any one of claims 1-9.

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